Patent Application
20230415242
The present disclosure relates to a workpiece clamping device and a machine tool that clamp a workpiece having a rectangular shape by chuck claws.
In the conventional art, various workpiece clamping devices that clamp a workpiece by multiple chuck claws have been proposed. Patent Literature 1 discloses a workpiece clamping device that clamps a workpiece having a quadrangular shape by three chuck claws. Among the three chuck claws of Patent Literature 1, distal ends of the two chuck claws are formed into a straight line that comes into contact with one side of the workpiece. In addition, a distal end of the remaining one chuck claw has a square shape that comes into contact with two sides of the workpiece.
Patent Literature 1: JP-A-H05-63708 (paragraphs 0005 and 0016)
In the workpiece clamping device described above, only one corner of multiple corners is held by the chuck claw with respect to the workpiece having the rectangular shape, and there is a concern that a positional deviation occurs when the workpiece is clamped. Therefore, there is room for improvement as the workpiece clamping device that clamps the workpiece having the rectangular shape.
The present disclosure has been made in view of the above-described problems, and an object is to provide a workpiece clamping device and a machine tool capable of accurately clamping a workpiece having the rectangular shape.
In order to solve the above-described problems, the present description discloses a workpiece clamping device including a chuck main body, multiple first chuck claws attached to the chuck main body, a second chuck claw attached to the chuck main body, and a driving source configured to move the first chuck claws and the second chuck claw to clamp a workpiece having a rectangular shape, in which the multiple first chuck claws each have a pair of first contact portions, are disposed at positions of different corners, respectively, on the workpiece having the rectangular shape, and are each configured to bring each of the pair of first contact portions into contact with two sides forming the corner to hold the corner, and the second chuck claw has a second contact portion, and is configured to bring the second contact portion into contact with one side of the workpiece having the rectangular shape to hold the one side of the workpiece.
The content of the present disclosure is not limited to implementation as the workpiece clamping device, but is also extremely effective to implementation as a machine tool including the workpiece clamping device.
With the workpiece clamping device and the machine tool of the present disclosure, multiple corners of the workpiece having the rectangular shape are held by the multiple first chuck claws, respectively, while one side is held by the second chuck claw. The first chuck claw brings each of the pair of first contact portions into contact with two sides of the corner to hold the corner. As a result, by holding the multiple corners by the multiple first chuck claws, respectively, it is possible to suppress a positional deviation that occurs when the workpiece having the rectangular shape is clamped, and the workpiece having the rectangular shape can be clamped accurately.
Hereinafter, an embodiment of a machine tool of the present disclosure will be described in detail with reference to the accompanying drawings.
As shown in
As shown in
The main spindle of right side main spindle device 12R is parallel to the Z direction and faces the main spindle of left side main spindle device 12L in the left-right direction. Therefore, left side and right side machining devices 11L and 11R are so-called facing biaxial-type lathes disposed symmetrically in the left-right direction. Left side and right side machining devices 11L and 11R need not have configurations symmetrical in the left-right direction. In addition, right side machining device 11R need not have the same configuration as left side machining device 11L. For example, at least one of left side machining device 11L and right side machining device 11R may be another type of machining device, such as a machining center.
Machine tool 1 is a multifunctional machining machine having both functions of an NC lathe and a machining center. Machine tool 1 includes a multifunctional machining machine including left side and right side machining devices 11L and 11R, and tool main spindle device 21 on one bed 22. Tool main spindle device 21 is provided substantially at the center of machine tool 1 in the left-right direction. Tool main spindle device 21 executes machining that is difficult by left side and right side machining devices 11L and 11R that are lathes. Tool main spindle device 21 can execute, for example, drilling or the like on the workpieces gripped, respectively, by left side and right side main spindle devices 12L and 12R, in addition to lathing, and can execute workpiece machining at a depth or an angle that is difficult by left side and right side turrets 13L and 13R.
Each of left side and right side main spindle devices 12L and 12R rotates workpiece W (see
In addition, automatic tool exchanging device 25 is provided on a front side of tool main spindle device 21. Tool main spindle device 21 can replace the tool (main spindle head tool) with automatic tool exchanging device 25. Automatic tool exchanging device 25 includes a tool magazine in which the multiple tools are accommodated in an upper part of the device, and conveys a tool for exchanging from the tool magazine to a tool exchanging position of tool main spindle device 21 by a tool changer provided at a position facing tool main spindle device 21.
Machine tool 1 can also execute tool exchanging of tool main spindle device 21 while the machining of workpiece W is executed by each of left side and right side machining devices 11L and 11R. Machine tool 1 includes, for example, separation shutters (not shown) disposed on both left and right sides of tool main spindle device 21 in the Z direction, respectively. Machine tool 1 can individually move two separation shutters in the Y direction by a driving mechanism (not shown).
In addition, workpiece conveyance device 14 is, for example, a gantry-type autoloader, and executes delivery of workpiece W with each device, such as left side and right side machining devices 11L and 11R, and stocker device 9 that conveys in and discharges workpiece W. Operation panel 3 is provided on the front face of device cover 2, and includes touch panel 3A or operation device (push button, switch, or the like) 3B.
As shown in
Next, chuck main body 31 attached to left side and right side main spindle devices 12L and 12R will be described.
As shown in
As shown in
Slide portion 41 includes main body portion 41A and pair of flange portions 41B. A shape obtained by cutting main body portion 41A in a plane orthogonal to slide direction 45 has opening 41C on the side of upper surface 31A, and has a U-shape curved at substantially 90°. Main body portion 41A has edge portion 41D formed on a side opposite to opening 41C in the main spindle direction. Edge portion 41D is formed into a substantially straight line shape along width direction 46 when viewed from an outer side in slide direction 45. Each of pair of flange portions 41B is formed to protrude outward from both lower end portions of main body portion 41A in width direction 46 along edge portion 41D. Insertion groove 43 is formed by providing chuck main body 31 in a recessed manner to correspond to outer shapes of main body portion 41A and flange portion 41B.
Serration portions 41E are formed, respectively, on upper surfaces of both ends of main body portion 41A forming a U-shape (surface on the side of upper surface 31A). Each of pair of serration portions 41E is subjected to serration machining to form multiple protrusions having a triangular shape along width direction 46, and the multiple protrusions are continuously formed at equal intervals in slide direction 45. Reception portion 42 has a rod shape which is long in slide direction 45 and of which a cross section cut in a plane perpendicular to slide direction 45 has a substantially semicircular shape. In main body portion 41A, insertion groove 41F provided in a recessed manner to correspond to an outer shape of reception portion 42 is formed in opening 41C. Reception portion 42 is inserted into insertion groove 41F and is held by slide portion 41. A plane parallel to upper surface 31A (parallel to slide direction 45 and width direction 46) is formed on upper surface 42A of reception portion 42. In insertion groove 41F, pair of nut grooves 41G provided in a recessed manner on both sides in width direction 46 are formed at positions above reception portion 42. Nuts 56 (see
As shown in
As shown in
As shown in
Serration portion 53B having the same shape as serration portion 41E of slide portion 41 is formed on a lower surface of main claw 53. For example, a user determines a position at which main claw 53 is attached to slide portion 41 in slide direction 45, that is, a position at which second chuck claw 34 is attached, with the number of peaks of serration portion 41E as a reference. The user disposes main claw 53 on slide portion 41 such that serration portions 41E and 53B are engaged with each other at predetermined peak positions. The predetermined peak position is a position to correspond to the size of workpiece W.
In addition, for example, two bolts 55 are inserted into main claw 53, and main claw 53 is attached to attachment portion 37. For example, bolt 55 is inserted into main claw 53 along the main spindle direction, and a distal end thereof is screwed into nut 56 inserted into nut groove 41G of slide portion 41. Bolt 55 is screwed, for example, to a position at which the distal end thereof comes into contact with upper surface 42A of reception portion 42, and the position in the main spindle direction is fixed. Main claw 53 is fixed to attachment portion 37 by meshing serration portions 41E and 53B and screwing two bolts 55 to nut 56. Through-hole 54A is formed in sub claw 54 to correspond to the position at which bolt 55 is inserted.
Sub claw 54 is fixed on main claw 53 by, for example, four bolts 57. The method of attaching main claw 53 to attachment portion 37 and the method of attaching sub claw 54 to main claw 53 are examples. For example, main claw 53 may be fixed to attachment portion 37 using a screw, a rivet, a clamp member, or the like. Similarly, sub claw 54 may be fixed to main claw 53 using a screw or the like. The same applies to a method of attaching main claw 51 and sub claw 52 of first chuck claws 32 and 33 described later.
An inner side edge portion of sub claw 54 in slide direction 45 is formed into a straight line shape along width direction 46, for example. Pair of second contact portions 61 and 62 are formed on the inner side edge portion. Second contact portions 61 and 62 are formed, for example, at both ends of sub claw 54 in width direction 46, respectively. Second contact portions 61 and 62 of the present embodiment are disposed at symmetrical positions with center 78 (see
Next, first chuck claws 32 and 33 will be described. In the following description, descriptions of portions (for example, a mechanism of nut 56 fixed to attachment portion 37) having similar configurations to portions of second chuck claw 34 will be omitted as appropriate. Main claws 51 of first chuck claws 32 and 33 have a similar configuration. Sub claws 52 of first chuck claws 32 and 33 have an inverted shape in width direction 46. Therefore, in the following description, first chuck claw 32 will be mainly described, and the description of first chuck claw 33 will be omitted as appropriate. In addition, when main claw 51 and sub claw 52 of first chuck claw 32 are described in a distinguished manner from main claw 51 and sub claw 52 of first chuck claw 33, the description will be made by referring main claw 51 and sub claw 52 of first chuck claw 32 as main claw 51A and sub claw 52A (in a case of second chuck claw 34, main claw 51 and sub claw 52 are referred to as main claw 51B and sub claw 52B).
As shown in
Sub claw 52A is placed on main claw 51A. Sub claw 52A is a metallic member having a plate shape and a predetermined thickness in the main spindle direction. Sub claw 52A includes main body portion 67 having a predetermined width in slide direction 45 and width direction 46. Main body portion 67 is fixed to an upper surface of main claw 51A by multiple (for example, two) bolts 66. In addition, protruding portion 68 is formed on sub claw 52A. Protruding portion 68 is formed once in width direction 46 of main body portion 67 (in a case of
As described above, first and second chuck claws 32 to 34 are fixed to attachment portion 37. Therefore, control device 15 can integrally move first and second chuck claws 32 to 34 together with attachment portion 37 by driving hydraulic cylinder 47 and moving three attachment portions 37 in slide direction 45. As a result, control device 15 can open and close first and second chuck claws 32 to 34 to execute the chucking and cancellation the chucking of workpiece W.
Pair of first contact portions 71 and 72 are formed on sub claw 52A. First contact portion 71 is formed on an inner peripheral surface of main body portion 67 in slide direction 45 and at a position close to protruding portion 68 in width direction 46. First contact portion 72 is formed on an inner peripheral surface of protruding portion 68. As shown in
As indicated by dashed lines in
Similarly, first contact portion 72 of first chuck claw 32 is disposed at a position facing second contact portion 62 of second chuck claw 34 in the direction parallel to side 63. In addition, first contact portion 72 of first chuck claw 33 is disposed at a position facing second contact portion 61 of second chuck claw 34 in the direction parallel to side 63.
Here, depending on the position at which the contact portion is contacted to clamp workpiece W, that is, the position at which the clamping force is applied to workpiece W, there is a concern that the distortion occurs in workpiece W. In particular, as shown in
In addition, out of pair of first contact portions 71 and 72, the clamp surface of first contact portion 72 (first one of first contact portions 71 and 72) disposed at the position facing second contact portions 61 and 62 is larger than the clamp surface of first contact portion 71 (second one of first contact portions 71 and 72). As shown in an enlarged view of
Perpendicular lines of first contact portions 71 and 72 intersect with each other at the corner of workpiece W (part in which through-hole H is not formed). Specifically, in workpiece W, a region formed at the corner of workpiece W in the region in which through-hole H is not formed is defined as non-formation region 73 (see
Further, in the present embodiment, since each of second contact portions 61 and 62 is disposed at a position facing first contact portion 72, each of second contact portions 61 and 62 is disposed at a position close to the corner of workpiece W. As a result, it is possible to suppress the distortion that occurs in workpiece W by the clamping force applied from second contact portions 61 and 62.
As shown in
In a case where a straight line, which passes through center 79 of first chuck claw 32 in width direction 46 and is parallel to slide direction 45, is defined as straight line 81, pair of first contact portions 71 and 72 are disposed on one side of straight line 81 in width direction 46. Both first contact portions 71 and 72 are disposed on sides opposite to second chuck claw 34 (second contact portions 61 and 62) with straight line 81 in width direction 46 interposed therebetween. With this configuration, center 79 of first chuck claws 32 and 33 in width direction 46 can be made close to second chuck claw 34 while first chuck claws 32 and 33 are disposed at positions close to the corner. As a result, a distance between first and second chuck claws 32 to 34 can be shortened, and chuck main body 31 can be downsized. The disposition or the number of first contact portions 71 and 72 shown in
Next, cover member 83 will be described. As shown in
Bracket 85 is formed with insertion portion 85A which is bent to correspond to an outer shape of main claw 53 and into which main claw 53 is inserted. Insertion portion 85A is a groove long in slide direction 45, and is formed to correspond to the shape of main claw 53 to extend along an outer periphery of main claw 53. Therefore, by attaching bracket 85 to main claw 53, an inner peripheral surface of insertion portion 85A can be attached by being brought into close contact with a base portion of main claw 53 (end portion part on the side of chuck main body 31).
Bracket 85 is provided with attachment portion 85B extending in the main spindle direction. Attachment portion 85B is formed along insertion portion 85A (outer peripheral surface of main claw 53) to have a fixed width in the main spindle direction and to surround the base portion of main claw 53. Multiple bolt holes 85C are formed in attachment portion 85B. Bracket 85 is fixed to main claw 53 by screwing bolts 87 (see
Here, in the configuration in which first and second chuck claws 32 to 34 are attached to chuck main body 31 in an exchangeable manner as in chuck main body 31 of the present embodiment, there is a concern that a scrap enters a gap between first and second chuck claws 32 to 34 and chuck main body 31 or attachment portion 37. When the scrap is interposed in the gap, there is a concern that a failure occurs in opening and closing operations of first and second chuck claws 32 to 34, or a failure occurs in a chuck operation due to the scrap clamped between first and second chuck claws 32 to 34 and workpiece W. Therefore, cover member 83 can be attached to first and second chuck claws 32 to 34 of the present embodiment in order to prevent the scrap from entering the gap. As a result, it is possible to suppress the entering of the scrap and suppress the occurrence of the above-described failure.
Further, blocking member 86 is provided on cover member 83. As the material of blocking member 86, for example, MC Nylon (registered trademark) can be used. The material of blocking member 86 is not limited to MC nylon (registered trademark), and may be urethane, rubber, or the like. Blocking member 86 is formed into a substantially U-shape to correspond to the shape of bracket 85, that is, to correspond to the shape of main claw 53.
As shown in
In addition, multiple through-holes 85D are formed in bracket 85 on a surface to which blocking member 86 is attached (see
Cover member 83 is attached to main claws 51 and 53 in a state in which blocking member 86 comes into contact with upper surface 31A of chuck main body 31. Blocking member 86 of each cover member 83 is provided at a position at which a lower surface thereof is brought into contact with chuck main body 31 to block the gap between each of first and second chuck claws 32 to 34 and chuck main body 31 from the outside. As a result, it is possible to block the gap from the outside to prevent the scrap from entering the gap.
Here, as described above, since blocking member 86 is provided at a position coming into contact with chuck main body 31, there is a concern that blocking member 86 is worn as first and second chuck claws 32 to 34 move by sliding. Blocking member 86 has a predetermined thickness (for example, a thickness of a few millimeters) in the main spindle direction. As shown in
The configuration of cover member 83 described above is an example. For example, cover member 83 need not include blocking member 86. In this case, the entering of the scrap into the gap may be suppressed only by bracket 85. In addition, bracket 85 or blocking member 86 need not have a shape along the outer shape of main claw 53. For example, there may be a gap between the outer peripheral surface of main claw 53 and an inner peripheral surface of bracket 85 or blocking member 86.
Next, the work of machining and adjusting first and second contact portions 71, 72, 61, and 62 (hereinafter, may be referred to as first contact portion 71 or the like) will be described.
In machine tool 1 of the present embodiment, a predetermined amount of clearances 97 can be provided in advance in first contact portion 71 or the like, and unnecessary parts can be removed from clearance 97 in a state in which adjustment ring 93 is clamped. Specifically, as shown in
Three main claws 51 and 53 move by sliding in synchronization with slide direction 45 in accordance with the driving of hydraulic cylinder 47. As shown in
There is a concern that the position of first contact portions 71 or the like deviates due to an attachment error or the like of the work for attaching first and second chuck claws 32 to 34 to main claws 51 and 53. Therefore, machine tool 1 machines clearance 97 provided on first contact portion 71 or the like to correspond to the position at which machine tool 1 comes into contact with the clamp surface of workpiece W. As a result, the clamp surface of first contact portion 71 or the like can be accurately brought into contact with workpiece W. A thickness of clearance 97 is, for example, a few millimeters to a few tenths of a millimeter. In order to facilitate understanding of the position of clearance 97,
Control device 15 controls left side main spindle device 12L, for example, based on an operation input to touch panel 3A, and clamps adjustment ring 93 by main claws 51 and 53. In a state in which adjustment ring 93 is clamped, control device 15 cuts clearances 97 of first and second contact portions 71, 72, 61, and 62 by left side turret 13L or tool main spindle device 21. That is, the position or the shape of the clamp surface of first contact portion 71 or the like is adjusted to correspond to a quadrangular shape of workpiece W. The user inputs, for example, the coordinates of the position of side 63 or the position at which workpiece W is clamped, with the position of main spindle 38 on touch panel 3A as a reference. As indicated by arrows in
Incidentally, left side main spindle device 12L and right side main spindle device 12R are examples of a workpiece clamping device and a main spindle device. Hydraulic cylinder 47 is an example of a driving source. A direction parallel to main spindle 38 is an example of a thickness direction. Upper surface 31A is an example of an attachment surface. Bolt 87 is an example of a screw member. Bolt hole 85C is an example of an insertion hole. Left side and right side turrets 13L and 13R are examples of a machining device. Tool main spindle device 21 is an example of a machining device. Adjustment ring 93 is an example of an adjustment member.
As described above, according to the present embodiment described above, the following advantageous effects can be achieved.
In one aspect of the present embodiment, first chuck claws 32 and 33 are disposed at positions of different corner, respectively, on workpiece W having the rectangular shape, and each of pair of first contact portions 71 and 72 is brought into contact with two sides forming the corner to hold the corner. In addition, second chuck claw 34 holds one side of workpiece W by bringing second contact portions 61 and 62 into contact with side 63 of workpiece W. With this configuration, two corners of workpiece W having the rectangular shape are held by two first chuck claws 32 and 33, respectively, while one side is held by second chuck claw 34. It is possible to suppress a positional deviation that occurs when workpiece W having the rectangular shape is clamped, and it is possible to clamp workpiece W having the rectangular shape accurately. In addition, chuck main body 31 described above can be used as a general three-way claw chuck by changing the types of first and second chuck claws 32 to 34. Therefore, it is unnecessary to detach and exchange chuck main body 31 from left side and right side main spindle devices 12L and 12R in changeover of workpiece W, and it is possible to clamp workpiece W having the rectangular shape as well as the workpiece W having the circular shape by using the same chuck main body 31.
In a case where workpieces W having various shapes are clamped in this manner, control device 15 needs to adjust the clamping force to correspond to workpiece W. Each of left side and right side main spindle devices 12L and 12R of the present embodiment includes electromagnetic proportional depressurizing valve 49. For example, identification information (workpiece NO) of workpiece W which is the machining target and the data associating the NC program used to machine workpiece W are stored in storage device 15B. In the NC program, a current value of electromagnetic proportional depressurizing valve 49 to correspond to the clamping force suitable for workpiece W is set. The clamping force suitable for workpiece W as used herein is the clamping force to correspond to the shape or the rigidity of workpiece W. Control device 15 can adjust the hydraulic pressure of hydraulic cylinder 47 to obtain the clamping force suitable for workpiece W by reading out the NC program to correspond to the identification information from storage device 15B and executing the NC program. As a result, it is possible to suppress the distortion that occurs in workpiece W during the chucking. Control device 15 may determine the optimal clamping force by analyzing, for example, the shape, the machining content, the rigidity, and the like of workpiece W which is the machining target, and adjust the clamping force by controlling the current value of electromagnetic proportional depressurizing valve 49. In addition, a configuration may be adopted in which left side and right side main spindle devices 12L and 12R do not include electromagnetic proportional depressurizing valve 49.
In addition, machine tool 1 of the present embodiment is the multifunctional machining machine including left side and right side turrets 13L and 13R, and tool main spindle device 21. With this configuration, it is possible to execute various types of machining using the lathe, the rotating tool, or the like in a state where workpiece W having the rectangular shape is clamped by left side main spindle device 12L or right side main spindle device 12R, that is, in the clamped state of one workpiece. Therefore, in a case where various types of machining are executed on workpiece W having the rectangular shape, it is possible to suppress the occurrence of the positional deviation between the respective types of machining.
Left side and right side main spindle devices 12L and 12R are so-called facing biaxial-type main spindle devices. Tool main spindle device 21 is disposed between left side and right side main spindle devices 12L and 12R in the direction parallel to main spindle 38. Control device 15 of the present embodiment can execute machining using adjustment ring 93 on sub claws 52 and 54 of each of left side and right side main spindle devices 12L and 12R. With this configuration, by providing the rotating tool, such as end mill 99, in tool main spindle device 21, it is possible to execute the cutting on clearance 97 of both left side and right side main spindle devices 12L and 12R by one tool main spindle device 21.
The present disclosure is not limited to the above-described embodiment, and it is needless to say that various improvements and changes can be made without departing from the gist of the present disclosure.
For example, the configurations of chuck main body 31, first and second chuck claws 32 to 34 shown in
The shape of workpiece W in the above-described embodiment is an example. Workpiece W may have a polygonal shape having a pentagonal or more shape. In addition, workpiece W need not be formed with through-hole H.
In the above-described embodiment, all the contact portions are provided at positions facing other contact portions in the direction parallel to side 63 of workpiece W in the clamped state of workpiece W, but the present disclosure is not limited to this. For example, first contact portion 72 may be disposed at a position deviated from the position facing second contact portions 61 and 62. In addition, with respect to respective first contact portions 71 of first chuck claws 32 and 33, a first one of first contact portions 71 may be disposed at a position deviated from a position facing a second one of first contact portions 71.
In addition, the workpiece clamping device of the present disclosure is not limited to a device that rotates workpiece W, such as left side main spindle device 12L. For example, the workpiece clamping device may be a workpiece clamping device used in a device that does not rotate the workpiece, such as a machining center or a milling machine.
The positions of first contact portions 71 and 72 may be adjusted such that intersection point 76 of the clamp surfaces is disposed outside non-formation region 73.
Left side and right side main spindle devices 12L and 12R may have a configuration in which cover member 83 is not attachable. That is, machine tool 1 need not include cover member 83.
The screw member of the present disclosure is not limited to bolt 87, but may be another member to be screwed, such as a screw.
Bolt hole 85C is not limited to a long hole, but may be a circular hole.
The adjustment member of the present disclosure is not limited to an annular member, such as adjustment ring 93, but may be a member having a polygonal shape, such as a quadrangular shape. In this case, the shape of adjustment recessed portion 95 may be appropriately changed to a rectangular shape or the like.
Cover member 83 may have an annular shape that covers the entire circumference of main claws 51 and 53. Alternatively, cover member 83 may have a U-shape fitted from the outside of first and second chuck claws 32 to 34 in slide direction
A configuration may be adopted in which cover member 83 is attached to sub claws 52 and 54.
Left side and right side machining devices 11L and 11R are not limited to the facing biaxial-type lathes, but may be parallel biaxial-type lathes.
The machine tool of the present disclosure is not limited to the multifunctional machining machine, and various machine tools, such as a horizontal-type lathe, a front-type lathe, a vertical-type lathe, a machining center, a milling machine, and a drilling machine, can be adopted.
In addition, the present description also discloses a technical idea in which, in Claim 4, [the workpiece clamping device according to Claim 1 or 2] is changed to [the workpiece clamping device according to any one of Claims 1 to 3]. In addition, the technical idea in which, in Claim 5, [the workpiece clamping device according to Claim 1 or 2] is changed to [the workpiece clamping device according to any one of Claims 1 to 4] is also disclosed. In addition, the technical idea in which, in Claim 6, [the workpiece clamping device according to Claim 1 or 2] is changed to [the workpiece clamping device according to any one of Claims 1 to 5] is also disclosed. In addition, the technical idea in which, in Claim 8, [the workpiece clamping device according to Claim 6] is changed to [the workpiece clamping device according to Claim 6 or 7] is also disclosed. In addition, the technical idea in which, in Claim 10, [the workpiece clamping device according to Claim 1 or 2] is changed to [the workpiece clamping device according to any one of Claims 1 to 9] is also disclosed.
1: machine tool, 12L: left side main spindle device (workpiece clamping device, main spindle device), 12R: right side main spindle device (workpiece clamping device, main spindle device), 13L, 13R: left side and right side turrets (machining device), 15: control device, 21: tool main spindle device (machining device), 31: chuck main body, 31A: upper surface (attachment surface), 32, 33: first chuck claw, 34: second chuck claw, 38: main spindle, 45: slide direction, 46: width direction, 47: hydraulic cylinder (driving source), 51, 51A, 51B, 53: main claw, 52, 52A, 52B, 54: sub claw, 61, 62: second contact portion, 63: side, 71, 72: first contact portion, 73: non-formation region, 78, 79: center, 81: straight line, 83: cover member, 85: bracket, 85C: bolt hole (insertion hole), 86: blocking member, 87: bolt (screw member), 93: adjustment ring (adjustment member), 95: adjustment recessed portion, W: workpiece
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-101123 | Jun 2022 | JP | national |
