Patent Application
20220250209
There has already been proposed a grinding tool having at least one main body that comprises at least one connection region and at least one contact region, wherein the contact region surrounds the connection region at least substantially completely as viewed in at least one plane of main extent of the main body, and having a multiplicity of grinding elements that are arranged on the main body, wherein the main body delimits a multiplicity of suction extraction openings.
The invention is based on a grinding tool, in particular a diamond cup wheel, having at least one main body that comprises at least one connection region and at least one contact region, wherein the contact region surrounds the connection region at least substantially completely as viewed in at least one plane of main extent of the main body, and having a multiplicity of grinding elements that are arranged on the main body, wherein the main body delimits a multiplicity of suction extraction openings.
It is proposed that the suction extraction openings be arranged in each case between at least two grinding elements of the multiplicity of grinding elements, as viewed along a circumferential direction of the main body. Preferably, the main body has at least one central axis extending, in particular centrally, through the connection region. The central axis is preferably at least substantially perpendicular to the plane of main extent of the main body. Preferably, the central axis is realized as an axis of rotational symmetry of the main body. In particular, the central axis is realized as an axis of rotation about which the grinding tool can be driven in rotation. A “plane of main extent” of a component, in particular of the main body, is to be understood to mean, in particular, a plane that is parallel to a largest lateral surface of a smallest notional cuboid that only just completely encloses the component. “Substantially perpendicular” is to be understood to mean, in particular, an alignment of a straight line or of a plane, in particular or the central axis, relative to a further straight line or a further plane, in particular the plane of main extent of the main body, the straight line or the plane and the further straight line or the further plane, in particular as viewed in a plane of projection, enclosing an angle of 90° and the angle having a maximum deviation of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2°. Preferably, the circumferential direction extends in the plane of main extent of the main body. Preferably, the circumferential direction is aligned, within the plane of main extent of the main body, along a circular path of which the mid-point is located on the central axis. Preferably, the suction extraction openings and/or the grinding elements are arranged in a symmetrically distributed manner around the central axis, in particular in groups, preferably as viewed in the plane of main extent of the main body. Preferably, inner surfaces of the main body, each of which delimits one of the suction extraction openings, span at least one maximum angular range around the central axis, as viewed in the plane of main extent of the main body, the grinding elements being in particular arranged outside the maximum angular ranges of the inner surfaces. Preferably, the suction extraction openings delimited by the main body are all realized identically. Alternatively, the suction extraction openings are realized differently from each other, in particular in their geometric shape, in a maximum cross-sectional area or the like. It is conceivable for the grinding elements all to be realized identically. Particularly preferably, the grinding tool has a greater number or grinding elements than a number of suction extraction openings.
In particular, the grinding elements are designed to remove material from a workpiece, in particular from a workpiece on which work is performed with the grinding tool and preferably at least partially in contact with the contact region. Preferably, the grinding elements, as viewed in the plane of main extent of the main body, individually have a cross-sectional area of at least 120 mm2, preferably at least 150 mm2 and particularly preferably at least 170 mm2. Preferably, the grinding elements, as viewed in the plane of main extent of the main body, individually have a cross-sectional area of at most 300 mm2, preferably at most 250 mm2 and particularly preferably at most 220 mm2. In particular, the grinding elements individually have a maximum extent of at most 30 mm, preferably at most 27 mm and particularly preferably at most 25 mm, along a longitudinal axis of the grinding elements or along the circumferential direction. Preferably, the grinding elements individually have a maximum extent of at most 10 mm, preferably at most 9 mm and particularly preferably at most 8.7 mm, along a transverse axis of the grinding elements or along an axis of the grinding elements that is at least substantially perpendicular to the circumferential direction. Preferably, the grinding tool has at most 15, preferably at most 12 and more preferably at most 9 grinding elements. Preferably, the grinding tool has at least more than one, preferably at least 3 and more preferably at least 9 grinding elements. Preferably, the grinding elements individually have, at least substantially parallel to the central axis, a maximum extent or at most 6 mm, preferably at most 5.7 mm and particularly preferably at most 5.5 mm. “Substantially parallel” is to be understood here to mean, in particular, an alignment of a straight line or of a plane, in particular of the maximum extent, relative to a further straight line or a further plane, in particular the central axis, the straight line or the plane having a deviation of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2° with respect to the further straight line or the further plane. Preferably, the grinding elements individually have, at least substantially parallel to the central axis, a maximum extent of at least 3 mm, preferably at least 4 mm and particularly preferably at least 4.5 mm. Preferably, at least one grinding element of the multiplicity of grinding elements is realized as an inner grinding element, in particular the inner grinding element, preferably as viewed in the plane of main extent of the main body, being arranged at least partially, in particular at least substantially completely, in an inner edge region of the contact region on the main body that delimits the connection region. Preferably, at least one further grinding element of the multiplicity of grinding elements is realized as an outer grinding element, in particular the further outer grinding element, preferably as viewed in the plane of main extent of the main body, being arranged at least partially, in particular at least substantially completely, in an outer edge region of the contact region on the main body. That a component, in particular the grinding element or the further grinding element, has a property or is arranged in a region, in particular in the outer or in the inner edge region, “substantially completely” is to be understood in particular to mean that at least 95%, preferably at least 98% and particularly preferably at least 99%, of a mass, of a volume and/or of an area of the component, in particular as viewed in a plane of projection, have/has the property or are/is arranged in the region. In particular, the outer edge region, preferably as viewed in the plane of main extent of the main body, extends within a minimum radial distance from an outer edge of the grinding tool, in particular of the contact region, the minimum radial distance being at most 20 mm, preferably at most 15 mm and particularly preferably at most 12 mm. Preferably, the inner edge region, preferably as viewed in the plane of main extent of the main body, extends within a minimum radial distance from an inner edge of the contact region that delimits the connection region, the minimum radial distance being at most 20 mm, preferably at most 15 mm and more preferably at most 12 mm. In particular, the grinding element realized as an inner grinding element, in particular as viewed in the plane of main extent of the main body, has a minimum distance from the central axis that corresponds to a value from a value range of from 25 mm to 55 mm, preferably from 35 mm to 45 mm and particularly preferably from 37 mm to 43 mm. It is conceivable for the further grinding element realized as an outer grinding element to have at least one lateral surface, the further grinding element being arranged in such a manner that the lateral surface of the further grinding element is arranged in a plane with an outer edge of the main body, in particular of the contact region, as viewed in particular from the central axis. Preferably, the grinding elements are realized as diamond grinding elements. In particular, the grinding elements individually, at least on a side of the grinding elements that faces away from the contact surface, comprise a multiplicity of diamond particles. Preferably, the grinding elements have a curved shape. It is conceivable for the grinding elements, in particular as viewed in the plane of main extent of the main body, to have at least one lateral surface, preferably two lateral surfaces having a curvature corresponding to a curvature of a circle around the central axis, the circle having a radius corresponding to a minimum radial distance of the lateral surface from the central axis. Alternatively, it is conceivable for the grinding elements, in particular as viewed in the plane of main extent of the main body, to be realized at least substantially rectilinearly, in particular the grinding elements having at least one lateral surface that is at least partially, in particular at least for the most part, at least substantially perpendicular to a maximum diameter of the main body, in particular of the contact region.
Particularly preferably, the suction extraction openings are arranged, in particular at least substantially completely, within the contact region. In particular, the suction extraction openings are designed to convey dust, removed during working on a workpiece by means of the grinding elements, away from a work region of the grinding tool. Particularly preferably, the suction extraction openings are realized as dust suction extraction openings. Preferably, the work region is arranged on a side of the main body, in particular of the contact region, on which the grinding elements are arranged. Preferably, the connection region and/or the contact region, as viewed in the plane of the main extent of the main body, are/is realized in the shape of a circular ring and, in particular, are centered around the central axis. In particular, the main body, in particular the contact region and the connection region, is realized in one piece. “In one piece” is to be understood to mean, in particular, connected in a materially bonded manner such as, for example, by a welding process and/or an adhesive process and, particularly advantageously, formed-on, as by being produced from a casting and/or by being produced in a single or multi-component injection process. Preferably, the main body within the connection region is at least partially cup-shaped, in particular the main body within the connection region around the central axis delimiting at least one recess for fastening the grinding tool to a grinding tool machine. In particular, the recess delimited by the connection region, in particular as viewed in the plane of main extent of the main body, is realized in a circular and/or cylindrical shape, in particular a maximum diameter of the recess having a value from a value range of from 10 mm to 40 mm, preferably from 20 mm to 30 mm and particularly preferably from 22 mm to 24 mm. Preferably, the main body has at least one contact surface, which extends over the contact region, on a side that in particular faces away from the connection region. Preferably, the connection region has a maximum diameter of at least 50 mm, preferably at least 65 mm and more preferably at least 75 mm. In particular, the contact region has a maximum radial width around the central axis of at least 15 mm, preferably at least 20 mm and more preferably at least 22 mm. Preferably, the grinding elements are arranged over the contact surface on the main body. Preferably, the main body has a maximum thickness having a value from a value range of from 1 mm to 10 mm, preferably 2 mm to 6 mm and particularly preferably 3.5 mm to 4.5 mm within the contact region, in particular at least substantially perpendicular to the plane of main extent of the main body.
Preferably, at least one other grinding element of the multiplicity of grinding elements is realized as a radial grinding element, in particular the other grinding element having a longitudinal axis that is at least substantially parallel to a transverse axis and/or the maximum diameter of the main body. In particular, the transverse axis intersects central axis, in particular in the plane of main extent of the main body. Preferably, the longitudinal axis of the other grinding element is at least substantially perpendicular to the circumferential direction and/or to a longitudinal axis of the grinding element realized as an outer grinding element and/or of the further grinding element realized as an inner grinding element. In particular, the other grinding element is arranged at least partially within the outer edge region and/or the inner edge region on the main body, in particular in the contact region. Preferably, the other grinding element has a radial extent that is at least equal to, or greater than, the suction extraction openings, in particular along a maximum diameter of the main body. The design of the grinding tool according to the invention makes it possible to achieve an advantageously high rate of extraction of dust by suction when work is being performed on a workpiece by means of the grinding tool. An advantageously high rate of material removal by the grinding tool becomes possible. In particular, the arrangement of the suction extraction openings and grinding elements makes it possible to achieve advantageously low production costs for the grinding tool.
It is additionally proposed that the multiplicity of grinding elements be arranged as groups of grinding elements on the main body, and that the suction extraction openings be arranged in each case between two groups of grinding elements as viewed along the circumferential direction of the main body. In particular, at least two grinding elements form a group. Preferably, the groups individually are formed in each case by grinding elements arranged between two suction extraction openings on the main body that are arranged in succession as viewed along the circumferential direction. Preferably, the groups individually are in each case composed of at least one inner grinding element and at least one outer grinding element, which are arranged together between two suction extraction openings, in particular as viewed along the circumferential direction. Particularly preferably, the grinding tool has three, four or five groups of grinding elements. Preferably, a group of grinding elements has an arrangement of two or more grinding elements, each of the grinding elements having a minimum distance from at least one other, in particular directly adjacent, grinding element that corresponds at most to a maximum extent of the grinding element. In particular, the minimum distance between directly adjacent grinding elements of a group is in particular at most 26 mm, preferably at most 24 mm and particularly preferably at most 20 mm. In particular, the grinding elements of a group of grinding elements have at least partially the same function, the same design and/or the same arrangement, in particular an at least partially same arrangement along the circumferential direction relative to the suction extraction openings. In particular, the groups of grinding elements each individually have a number of two to five grinding elements. It is also conceivable, however, for the groups of grinding elements each individually to have more than five grinding elements An advantageously high rate of extraction of dust by suction can be achieved when work is being performed on a workpiece by means of the grinding tool. An advantageously high rate of material removal by the grinding tool becomes possible.
It is furthermore proposed that a ratio of a minimum distance of the suction extraction openings delimited by the main body from a, in particular the aforementioned, central axis of the main body, to a, in particular the aforementioned, maximum diameter of the contact region is at least 0.05, preferably at least 0.2 and particularly preferably at least 0.34. Particularly preferably, the ratio of the minimum distance to the maximum diameter of the contact region has a value from a value range of from 0.1 to 0.4, preferably from 0.2 to 3.0 and particularly preferably from 0.34 to 3.7. Preferably, the maximum diameter of the contact region and/or the minimum distance of the suction extraction openings from the central axis is at least substantially parallel to the plane of main extent of the main body. Preferably, the maximum diameter of the contact region corresponds to a value from a value range of from 120 mm to 125 mm. It is also conceivable, however, for the maximum diameter of the contact region to correspond to a value from a value range of from 100 mm to 105 mm, 110 mm to 115 mm, 145 mm to 155 mm, or 175 mm to 185 mm. Particularly preferably, a radial distance of an inner, in particular innermost, surface of the main body, that faces away from the central axis and delimits a suction extraction opening, from the central axis is at least 35 mm, preferably at least 40 mm and particularly preferably at least 42 mm. Preferably, a minimum radial distance from the suction extraction openings to the central axis of the main body is greater than a minimum radial distance from an inner grinding element to the central axis. Preferably, a maximum radial distance from the suction extraction openings to the central axis of the main body is less than a maximum radial distance from an outer grinding element to the central axis. An advantageous arrangement of the suction extraction openings on the main body becomes possible, in particular in order to achieve an advantageously high suction extraction rate of the grinding tool. Advantageously, an arrangement of the suction extraction openings in a region of the main body in which the grinding elements are arranged, in particular outside the connection region, becomes possible.
It is additionally proposed that a ratio of a maximum longitudinal extent of the suction extraction openings delimited by the main body to a, in particular the aforementioned, maximum diameter of the contact region is at most 0.9, preferably at most 0.5 and particularly preferably at most 0.3. Particularly preferably, the ratio of the maximum longitudinal extent of the suction extraction openings to the maximum diameter of the contact region is at least 0.05, preferably at least 0.1 and more preferably at least 0.15. Very particularly preferably, the ratio of the maximum longitudinal extent of the suction extraction openings to the maximum diameter of the contact region is a value from a value range of between 0.15 and 0.25. Preferably, the maximum longitudinal extent is at least substantially perpendicular to the central axis, to the minimum distance of the suction extraction openings from the central axis and/or to a radial extent of the main body. Preferably, the maximum longitudinal extent of the suction extraction openings is at least substantially parallel to the plane of main extent of the main body. Preferably, the maximum longitudinal extent of the suction extraction openings is at least 13 mm, preferably at least 20 mm and more preferably at least 24 mm. In particular the maximum longitudinal extent of the suction extraction openings is at most 60 mm, preferably at most 50 mm and more preferably at most 30 mm. Preferably, the suction extraction openings, in particular as viewed in the plane of main extent of the main body, have a maximum transverse extent of at least 9 mm, preferably at least 10 mm and particularly preferably at least 11.8 mm. Preferably, the suction extraction openings, in particular as viewed in the plane of main extent of the main body, have a maximum transverse extent of at most 30 mm, preferably at most 20 mm and particularly preferably at most 13 mm. In particular, the maximum transverse extent is at least substantially parallel to the maximum diameter of the grinding tool, in particular of the main body and/or of the contact region, and/or at least substantially perpendicular to the circumferential direction or the longitudinal extent. For example, the suction extraction openings delimited by the main body, in particular the inner surfaces of the main body that delimit the suction extraction openings, have an at least partially round, elliptical or lenticular contour as viewed in the plane of main extent of the main body. It is also conceivable for the contour of the suction extraction openings delimited by the main body, in particular of the inner surfaces of the main body that delimit the suction extraction openings, to have a differently realized contour as viewed in the plane of main extent of the main body, in particular the contour being realized as a closed line segment, which comprises two sides that are of equal length and parallel to each other and that in each case are connected at their ends, which in each case are aligned in the same direction, via a semicircular side. In particular, the inner surfaces of the main body that delimit suction extraction openings are at least substantially perpendicular to the plane of main extent of the main body or are inclined with respect to the plane of main extent of the main body. Preferably, the suction extraction openings individually have a longitudinal axis along which the maximum longitudinal extent is realized. Preferably, the suction extraction openings are arranged in such a manner that the longitudinal axis, in particular as viewed in the plane of main extent of the main body, is at least substantially parallel or at least substantially perpendicular to the maximum diameter of the main body, in particular of the contact region. Alternatively, it is conceivable for the suction extraction openings to be arranged in such a manner that the longitudinal axis is transverse, in particular with an angle from an angular range of from 8° to 82°, to the maximum diameter of the main body. Alternatively or additionally, it is conceivable for the main body to delimit suction extraction openings that are realized differently from each other, the suction extraction openings differing in a size and/or an arrangement of the main body. The suction extraction openings may extend over an advantageously large portion of a circumference of the main body, in particular in order to achieve an advantageously high rate of extraction by suction by the grinding, tool. An advantageously small number of suction extraction openings becomes possible, irrespective of a change in the suction extraction rate of the grinding tool, in particular compared to a grinding tool having an equal number or suction extraction openings.
It is further proposed that the suction extraction openings delimited by the main body, in particular as viewed in the plane of main extent of the main body, individually have a cross-sectional area of at least 180 mm2, preferably at least 220 mm2, particularly preferably at least 250 mm2, and very preferably at least 265 mm2. In particular, the suction extraction openings delimited by the main body, in particular as viewed in the plane of main extent of the main body, individually have a cross-sectional area of at most 1000 mm2, preferably at most 700 mm2, particularly preferably at most 400 mm2 and very particularly preferably at most 370 mm2. Preferably, a ratio of a total cross-sectional area of the suction extraction openings to a total area of the contact region, in particular the contact surface, is at least 0.1, preferably at least 0.15 and particularly preferably at least 0.2. Preferably, a ratio of a total cross-sectional area of the suction extraction openings to a total cross-sectional area of the main body in the plane of main extent of the main body is at least 0.075, preferably at least 0.09 and particularly preferably at least 0.16. Preferably, the cross-sectional areas of the suction extraction openings in the plane of main extent of the main body are surrounded by the inner surfaces of the main body that delimit the suction extraction openings. Preferably, the cross-sectional areas in the plane of main extent of the main body individually each have at least one basic shape, which is delineated in particular by the contour of the suction extraction openings, in particular of the inner surfaces. Preferably, the basic shape of the cross-sectional surfaces is conical, in particular circular, elliptical and/or lenticular. An advantageously high suction extraction rate of the individual suction extraction openings can be achieved. Advantageously, clogging of the suction extraction openings with dust can be at least substantially delayed and/or prevented. An advantageously high suction extraction rate of the grinding tool can be achieved. An advantageously small number of suction extraction openings becomes possible, irrespective of a change in the suction extraction rate of the grinding tool, in particular compared to a grinding tool having an equal number of suction extraction openings.
It is furthermore proposed that the main body delimit at most five suction extraction openings. Preferably, the main body delimits at least three suction extraction openings. In particular, the main body delimits exactly three, exactly four or exactly five suction extraction openings. An advantageously rapid process of production of the grinding tool becomes possible, in particular since it is possible to achieve an advantageously small number of suction extraction openings delimited by the main body. Low production costs for the grinding tool thus become possible. An advantageously high degree of robustness against deformation and/or damage to the grinding tool becomes possible, in particular because a high thickness of material can be realized between the suction openings.
It is additionally proposed that the suction extraction openings delimited by the main body be arranged in the contact region and, as viewed in the plane of main extent of the main body, extend over at least 30%, preferably at least 40% and particularly preferably at least 50%, of a maximum radial extent of the contact region, in particular from a side of the contact region that delimits the connection region to an outer edge of the contact region. In particular, the suction extraction openings delimited by the main body extend, as viewed in the plane of main extent of the main body, over at most 95%, preferably at most 90% and particularly preferably at most 85%, of the maximum radial extent of the contact region. An advantageously high suction extraction rate can be realized by the suction extraction openings in the contact region. An advantageously high degree of robustness against deformation and/or damage to the grinding tool can be achieved, in particular because it is possible to dispense with suction extraction openings in the connection region.
It is further proposed that the suction extraction openings delimited by the main body, as viewed in the plane of main extent of the main body, are arranged spaced apart from each other around a central axis of the main body over an angular range of at least 45°, preferably at least 55° and particularly preferably at least 65°. In particular, the angular range over which the suction extraction openings delimited by the main body are arranged spaced apart from each other, as viewed in the plane of main extent of the main body, is at most 120°, preferably at most 110° and particularly preferably at most 100°. Preferably, the angular range around the central axis spanned by the individual suction extraction openings extends over at least 14°, preferably at least 20° and more preferably over at least 25°. In particular, the angular range around the central axis spanned by the individual suction extraction openings extends over at most 80°, preferably at most 65° and particularly preferably at most 50°. An advantageously high degree of stability of the main body can be achieved. An advantageously high degree of robustness against deformation and/or damage to the grinding tool can be achieved.
It is furthermore proposed that an individual group of grinding elements comprise at most five, preferably at most four and more preferably at most three, grinding elements. Preferably, each group of grinding elements comprises the same number of grinding elements, which in particular are realized identically in their arrangement with respect to each other. It is also conceivable for an individual group of grinding elements to have more than five grinding elements. Advantageously low production costs for the grinding tool become possible, in particular since it is possible to achieve an advantageously small number of grinding elements per individual group.
It is additionally proposed that an individual group of grinding elements have at least one inner grinding element, in particular the aforementioned grinding element, arranged in an inner edge region of the contact region on the main body, in particular the aforementioned inner edge region delimiting the connection region, wherein a maximum of six, preferably a maximum of four, inner grinding elements are arranged on the main body. Preferably, each of the groups of grinding elements has at least one inner grinding element. Advantageously low production costs for the grinding tool become possible, in particular as a result of an advantageously small number of inner grinding elements.
It is further proposed that an individual group of grinding elements comprise at least one outer grinding element, in particular the aforementioned further grinding element, arranged in an, in particular the aforementioned, outer edge region of the contact region on the main body, wherein a maximum of six outer grinding elements are arranged on the main body. Preferably, each of the groups of grinding elements has at least one, in particular at least two, outer grinding elements. Advantageously low production costs for the grinding tool become possible, in particular as a result of an advantageously small number of outer grinding elements.
It is furthermore proposed that an individual group of grinding elements comprise at least two outer grinding elements and at least one inner grinding element, wherein the outer grinding elements are arranged in an outer edge region of the contact region and the inner grinding element is arranged in an inner edge region of the contact region that delimits the connection region, and wherein the inner grinding element, as viewed along the circumferential direction of the main body, is arranged, in particular at least substantially completely, between the two outer grinding elements. Alternatively, it is conceivable for the grinding elements of a group to be arranged on the main body in a staggered manner along a radial direction with respect to the central axis, wherein, in particular, the grinding elements of the group, as viewed along the radial direction, are arranged in a mutually offset manner in the circumferential direction. In particular, the arrangement of the outer grinding elements and the inner grinding element within the individual groups enables the groups to have an advantageously large working range. An advantageously balanced ratio of a material removal rate of the outer grinding elements and a material removal rate of the inner grinding elements of the grinding tool can be achieved, in particular because, during a movement of the grinding tool in the circumferential direction, the inner grinding tools cover a shorter distance around the central axis than the outer grinding elements.
It is additionally proposed that an individual group of grinding elements comprise at least one radial grinding element, in particular the aforementioned other grinding element, which is arranged in such a manner that a longitudinal axis of the radial grinding element is at least substantially parallel to a transverse axis of the main body, wherein the transverse axis intersects a central axis of the main body. Preferably, the transverse axis extends along the maximum diameter of the main body. In particular, the radial grinding element is arranged between two grinding elements, in particular two inner grinding elements, two outer grinding elements and/or one inner and one outer grinding element, of the group of grinding elements, as viewed along the circumferential direction. Preferably, each of the groups of grinding elements has at least one, in particular exactly one, radial grinding element. The radial grinding elements make it possible to work an advantageously large area around the central axis, in particular compared to another design of the grinding tool having an equal number of grinding elements. In particular, an advantageously high ratio of an area worked by means of the grinding tool and a number of grinding elements of the grinding tool becomes possible.
The grinding tool according to the invention is not intended in this case to be limited to the application and embodiment described above. In particular, the grinding tool according to the invention may have a number of individual elements, components and units that differ in number from a number stated herein, in order to fulfill an operating principle described herein. Moreover, in the case of the value ranges specified in this disclosure, values lying within the stated limits are also to be deemed as disclosed and applicable in any manner.
Further advantages are given by the following description of the drawings. The drawings show eight exemplary embodiments of the invention. The drawings, the description and the claims contain numerous features in combination. Persons skilled in the art will expediently also consider the features individually and combine them to form appropriate further combinations.
There are shown:
The grinding elements 36a, 40a are arranged in groups, in particular symmetrically in groups, distributed around the central axis 24a, as viewed in the plane of main extent 17a of the main body 12a. The suction extraction openings 20a are arranged in symmetrically distributed manner around the central axis 24a, as viewed in the lane of main extent 17a of the main body 12a. The suction extraction openings 20a are delimited by inner surfaces 28a of the main body 12a which, as viewed in the plane of main extent 17a of the main body 12a, span a maximum angular range 98a around the central axis 24a, the grinding elements 36a, 40a being arranged outside the maximum angular ranges 98a of the inner surfaces 28a. The suction extraction openings 20a delimited by the main body 12a are preferably all realized identically. The grinding elements 36a, 40a are preferably all realized identically. It is also conceivable, however, for the grinding elements 36a, 40a and/or the suction extraction openings 20a to be realized differently.
The grinding elements 36a, 40a, as viewed in the plane of main extent 17a of the main body 12a, individually have a cross-sectional area 32a that corresponds to a value from a value range of from 120 mm2 to 300 mm3, preferably 170 mm2 to 220 mm2, particularly preferably 190 mm2 to 195 mm2, and very particularly preferably 192 mm2. The grinding elements 36a, 40a, along a longitudinal axis 119a of the grinding elements 36a, 40a, individually have a maximum extent 34a that corresponds to a value from a value range of, in particular, from 20 mm to 30 mm, preferably 22 mm to 26 mm, particularly preferably 23 mm to 25 mm and very particularly preferably of 24 mm. The grinding elements 36a, 40a, at least substantially perpendicular to the longitudinal axes 119a of the grinding elements 36a, 40a, individually have a maximum transverse extent 35a that corresponds to a value from a value range of, in particular, from 6 mm to 10 mm, preferably 7 mm to 9 mm, particularly preferably 7.5 mm to 8.5 mm and very particularly preferably of 8 mm. Three of the grinding elements 36a, 40a are realized as inner grinding elements 36a, the inner grinding elements 36a, as viewed in the plane of main extent 17a of the main body 12a, being arranged at least substantially completely in an inner edge region 38a of the contact region 16a on the main body 12a that delimits the connection region 14a. Six of the grinding elements 36a, 40a are realized as outer grinding elements 40a, the outer grinding elements 40a, as viewed in the plane of main extent 17a of the main body 12a, being arranged at least substantially completely in an outer edge region 42a of the contact region 16a on the main body 12a. Preferably, the grinding elements 36a, 40a, in particular the outer grinding elements 40a and the inner grinding elements 16a, are arranged in such a manner that the longitudinal axes 119a of the grinding elements 36a, 40a have an angle 120a with respect to a maximum diameter 64a of the main body 12a, which in each case passes through a mid-point 117a of the grinding elements 36a, 40a, that corresponds to a value from a value range of, in particular, from 82° to 98°, preferably 85° to 95°, particularly preferably 88° to 92° and very particularly preferably 90°.
In particular, the outer edge region 42a, preferably as viewed in the plane of main extent 17a of the main body 12a, extends within a minimum radial distance 44a from an outer edge 46a of the grinding tool 10a, in particular of the contact region 16a, the minimum radial distance 44a corresponding to a value from a value range of, in particular, from 6 mm to 16 mm, preferably 8 mm to 14 mm, particularly preferably 9 mm to 11 mm and very particularly preferably of 10 mm. Preferably, the inner edge region 38a, preferably as viewed in the plane of main extent 17a of the main body 12a, extends within a minimum radial distance 48a from an inner edge 50a of the contact region 16a that delimits the connection region 14a, the minimum radial distance 48a corresponding to a value from a value range of, in particular, from 6 mm to 16 mm, preferably 8 mm to 14 mm, more preferably 9 mm to 11 mm and very particularly preferably of 10 mm. The inner grinding elements 36a, as viewed in the plane of main extent 17a of the main body 12a, have a minimum distance 52a from the central axis 24a that corresponds to a value from a value range of, in particular, from 35 mm to 50 mm, preferably 40 mm to 45 mm, particularly preferably 41 mm to 43 mm and very particularly preferably of 42 mm. In particular, the outer grinding elements 40a each have a lateral surface 54a, the outer grinding elements 40a being arranged in such a manner that the lateral surfaces 54a of the outer grinding elements 40a, as viewed from the central axis 24a, are arranged in a plane with the outer edge 46a of the main body 12a, in particular of the contact region 16a. The grinding elements 36a, 40a of the grinding tool 10a are realized as diamond grinding elements. The grinding elements 36a, 40a each individually comprise a multiplicity of diamond particles 58a on a side 56a of the grinding elements 36a, 40a that faces away from the contact surface 26a. Preferably, the grinding elements 36a, 40a have a curved shape. The grinding elements 36a, 40a, as viewed in the plane of main extent 17a of the main body 12a, each have two lateral surfaces 60a, which are at least substantially rectilinear, the two lateral surfaces 60a being transverse to the circumferential direction 22a. The grinding elements 36a, 40a, as viewed in the plane of main extent 17a of the main body 12a, each have two further lateral surfaces 62a, which at least partially are at least substantially parallel to the circumferential direction 22a and transverse to the maximum diameter 64a of the main body 12a, in particular of the contact region 16a. In particular, the further lateral surfaces 62a, as viewed in the plane of main extent 17a of the main body 12a, are at least partially rectilinear and are curved in an edge region of the further lateral surfaces 62a. However, other designs of the grinding elements 36a, 40a are also conceivable.
The suction extraction openings 20a are arranged at least substantially entirely within the contact region 16a, as viewed in the plane of main extent 17a of the main body 12a. The main body 12a, in particular the contact region 16a and the connection region 14a, are realized in one piece. The main body 12a delimits, within the connection region 14a around the central axis 24a, at least one recess 66a for fastening the grinding tool 10a to a grinding tool machine. The recess 66a delimited by the connection region 14a, as viewed in the plane of main extent 17a of the main body 12a, is realized in the shape of a circular surface. A maximum diameter 68a of the recess 66a has a value from a value range of, in particular, from 15 mm to 30 mm, preferably 20 mm to 26 mm, more preferably 22 mm to 24 mm and very particularly preferably of 23 mm. The connection region 14a has a maximum diameter 70a corresponding to a value from a value range of, in particular, from 60 mm to 85 mm, preferably 70 mm to 80 mm, particularly preferably 75 mm to 79 mm and very particularly preferably of 77 mm. The contact region 16a has a maximum radial extent 72a around the central axis 24a that corresponds to a value from a value range of, in particular, from 15 mm to 30 mm, preferably 20 mm to 26 mm, particularly preferably 22 mm to 24 mm and very particularly preferably of 23 mm.
The grinding elements 36a, 40a are arranged as groups 74a of grinding elements 36a, 40a on the main body 12a. The groups 74a of grinding elements 40a each individually comprise two outer grinding elements 40a and one inner grinding element 36a, the two outer grinding elements 40a of the group 74a being arranged in the outer edge region 42a of the contact region 16a, and the inner grinding element 36a of the group 74a being arranged in the inner edge region 38a of the contact region 16a that delimits the connection region 14a, and the inner grinding element 36a of the group 74a, as viewed along the circumferential direction 22a of the main body 12a, being arranged at least substantially completely between the two outer grinding elements 40a of the group 74a. The suction extraction openings 20a are in each case arranged between two groups 74a of grinding elements 36a, 40a, as viewed along the circumferential direction 22a of the main body 12a. Each of the groups 74a of grinding elements 36a, 40a comprises three grinding elements 36a, 40a. In particular, the two outer grinding elements 40a and the inner grinding element 36a, which in particular are arranged along the circumferential direction 22a between two of the suction extraction openings 20a, in each case form a group 74. The grinding tool 10a has three groups 74a of grinding elements 36a, 40a. A ratio of a minimum distance 75a of the suction extraction openings 20a delimited by the main body 12a from the central axis 24a of the main body 12a to a maximum diameter 76a of the contact region 16a corresponds to a value from a value range of, in particular, from 0.2 to 0.4, preferably 0.3 to 0.38, more preferably 0.34 to 0.36 and very particularly preferably of 0.35. Preferably, the maximum diameter 76a of the contact region 16a corresponds to a value from a value range of, in particular, from 100 mm to 185 mm, preferably 120 mm to 150 mm, particularly preferably 122 mm to 130 mm and very particularly preferably 123 mm, in particular to the maximum diameter 64a of the main body 12a. However, other designs of the grinding tool 10a, in particular of the suction extraction openings 20a, are also conceivable, for example having a value of the maximum diameter 64a, 76a of the main body, in particular of the contact region 16a, from a value range of from 100 mm to 105 mm, 110 mm to 115 mm, 145 mm to 155 mm or 175 mm to 185 mm. The radial distance 75a of an inner, in particular innermost, surface 28a of the main body 12a, that faces away from the central axis 24a and delimits a suction extraction opening 20a, from the central axis 24a has a value from a value range of, in particular, from 30 mm to 50 mm, preferably 37 mm to 45 mm, particularly preferably 40 mm to 43 mm and very particularly preferably of 42 mm. In particular, a minimum radial distance 75a from the suction extraction openings 20a to the central axis 24a of the main body 12a is greater than a minimum radial distance 52a from one of the inner grinding elements 36a to the central axis 24a. Preferably, a maximum radial distance 82a from the suction extraction openings 20a to the central axis 24a of the main body 12a is less than a maximum radial distance 84a from one of the outer grinding elements 40a to the central axis 24a.
A ratio of a maximum longitudinal extent 86a of the suction extraction openings 20a delimited by the main body 12a to the maximum diameter 76a of the contact region 16a corresponds to a value from a value range of, in particular, from 0.1 to 0.3, preferably 0.15 to 0.25, particularly preferably 0.19 to 0.21 and very particularly preferably of 0.2. In particular, the maximum longitudinal extent 86a of the suction extraction openings 20a is at least substantially parallel to the plane of main extent 17a of the main body 12a. The maximum longitudinal extent 86a of the suction extraction openings 20a has a value from a value range of, in particular, from 20 mm to 30 mm, preferably 23 mm to 27 mm, particularly preferably 24 mm to 26 mm and very particularly preferably of 25 mm. The suction extraction openings 20a, as viewed in the plane of main extent 17a of the main body 12a, have a maximum transverse extent 88a that corresponds to a value from a value range of, in particular, from 10 mm to 14 mm, preferably 11 mm to 13 mm, particularly preferably 11.5 mm to 12.5 mm and very particularly preferably of 12 mm. The maximum transverse extent 88a is at least substantially parallel to a maximum diameter 64a, 76a of the main body 12a, in particular of the contact region 16a, and at least substantially perpendicular to the maximum longitudinal extent 86a of the suction extraction openings 20a. For example, the suction extraction openings 20a delimited by the main body 12a, in particular inner surfaces 28a of the main body 12a delimiting the suction extraction openings 20a, have an at least partially round contour as viewed in the plane of main extent 17a of the main body 12a. The contour of the suction extraction openings 20a delimited by the main body 12a, in particular of the inner surfaces 28a of the main body 12a delimiting the suction extraction openings 20a, is realized as a as a closed line segment, which comprises two sides that are of equal length and parallel to each other and that in each case are connected at their ends, which in each case are aligned in the same direction, via a semicircular side. In particular, inner surfaces 28a of the main body 12a that delimit the suction extraction openings 20a are at least substantially perpendicular to the plane of main extent 17a or the main body 12a or oblique to the plane of main extent 17a of the main body 12a. The suction extraction openings 20a individually have a longitudinal axis 90a along which the maximum longitudinal extent 86a is aligned. Preferably, the suction extraction openings 20a are arranged in such a manner that the longitudinal axis 90a, in particular as viewed in the plane of main extent 17a of the main body 12a, is at least substantially perpendicular to a maximum diameter 64a, 76a of the main body 12a, in particular of the contact region 16a.
The suction extraction openings 20a delimited by the main body 12a, as viewed in the plane of main extent 17a of the main body 12a, individually have a cross-sectional area 92a that corresponds to a value from a value range of, in particular, from 195 mm2 to 365 mm2, preferably 240 mm2 to 300 mm2, particularly preferably 260 mm2 to 280 mm2 and very particularly preferably of 269.1 mm2. In particular, a ratio of a total cross-sectional area of the suction extraction openings 20a, which is formed in particular from a sum of the cross-sectional areas 92a of the suction extraction openings 20a, to a total area of the contact surface 26a corresponds to a value from a value range of, in particular, from 0.1 to 0.3, preferably 0.16 to 0.26, particularly preferably 0.2 to 0.22 and very particularly preferably of 0.213. Preferably, a ratio of a total cross-sectional area of the suction extraction openings 20a to a total cross-sectional area of the main body 12a in the plane of main extent 17a of the main body 12a corresponds to a value from a value range of, in particular, from 0.05 to 0.2, preferably 0.1 to 0.15, particularly preferably 1.12 to 0.13 and very particularly preferably 0.124. The cross-sectional areas 92a of the suction extraction openings 20a are surrounded, in the plane of main extent 17a of the main body 12a, by the inner surfaces 28a of the main body 12a that delimit the suction extraction openings 20a. The cross-sectional areas 92a of the suction extraction openings 20a in the plane of main extent 17a of the main body 12a individually each have at least one basic shape, which is delineated in particular by the contour of the suction extraction openings 20a, in particular of the inner surfaces 28a. The suction extraction openings 20a delimited by the main body 12a are arranged in the contact region 16a and, as viewed in the plane of main extent 17a of the main body 12a, extend over in particular 30-70%, preferably 45-55%, particularly preferably 50-54% and very particularly preferably 52.2%, of the maximum radial extent 72a of the contact region 16a, in particular from the inner edge 50a of the contact region 16a that delimits the connection region 14a to the outer edge 46a of the contact region 16a. The suction extraction openings 20a delimited by the main body 12a, as viewed in the plane of main extent 17a of the main body 12a, are arranged spaced apart from each other around a central axis 24a of the main body 12a over an angular range 96a, the angular range 96a extending over, in particular, from 40° to 100°, preferably 70° to 95°, particularly preferably 88° to 95° and very particularly preferably 91°. Preferably, the angular range 98a spanned by the individual suction extraction openings 20a extends around the central axis 24a over, in particular, from 10° to 60°, preferably 20° to 40°, particularly preferably 25° to 30° and very particularly preferably 28.6°.
The main body 12c delimits three suction extraction openings 20c which, as viewed along a circumferential direction 22c of the main body 12c, are in each case arranged between at least two, in particular in each case three, of the grinding elements 40c, 110c. It is also conceivable, however, for the main body 12c to delimit a number of suction extraction openings 20c that is other than three. The grinding tool 10c represented in
The suction extraction openings 20g have, in particular at least substantially perpendicular to their longitudinal axes 90g, a maximum transverse extent 88g that corresponds to a value from a value range of, in particular, from 5 mm to 30 mm, preferably 10 mm to 20 mm, particularly preferably 13.5 mm to 15.5 mm and very particularly preferably of 14.5 mm. The suction extraction openings 20g delimited by the main body 12g, as viewed in the plane of main extent 17g of the main body 12g, are arranged spaced apart from each other around the central axis 24g of the main body 12g over an angular range 96g of, in particular, from 30° to 60°, preferably 40° to 50°, particularly preferably 43° to 47° and very particularly preferably 45°. Preferably, an angular range 98g spanned by the individual suction extraction openings 20g extends around the central axis 24g over, in particular, from 10° to 40°, preferably 20° to 30°, more preferably 22° to 26° and very particularly preferably 24°. The suction extraction openings 20g delimited by the main body 12g are arranged in the contact region 16g and, as viewed in the plane of main extent 17g of the main body 12g, extend over at least 60%, preferably at least 70%, more preferably at least 80° and very particularly preferably 83%, of a maximum radial extent 72g of the contact region 16g, in particular from the inner edge 50g of the contact region 16g that delimits the connection region 14a to an outer edge 46g of the contact region 16g. In particular, a ratio of a total cross-sectional area of the suction extraction openings 20g, which is formed in particular from a sum of the cross-sectional areas 92g of the suction extraction openings 20g, to a total area of a contact surface 26g of the contact region 16g corresponds to a value from a value range of, in particular, from 0.15 to 0.5, preferably 0.3 to 0.4, particularly preferably 0.32 to 0.34 and very particularly preferably 0.33. Preferably, a ratio of a total cross-sectional area of the suction extraction openings 20g, to a total cross-sectional area of the main body 12g in the plane of main extent 17g of the main body 12g corresponds to a value from a value range of, in particular, from 0.1 to 0.3, preferably 0.15 to 0.25, particularly preferably 0.17 to 0.19 and very particularly preferably 0.18.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 211 349.4 | Jul 2019 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/069944 | 7/15/2020 | WO |
