Patent Application
20230117770
The invention relates to an intermediate for manufacturing of projectiles, in particular, deformable bullets or partial fragmentation bullets, wherein, in particular, the finished projectile has an unfilled cavity in particular, in the region of the ogive in particular, which is limited by an ogival wall of the projectile. For the intermediate, a ductile, in particular, lead-free material, such as copper, a copper alloy, brass or the like, can be used. Furthermore, the invention relates to the projectile, in particular, the deformable bullet per se. In addition, the invention relates to a projectile that is deformed, in particular, under idealized test conditions, which projectile hits into and is intercepted by a bare gelatinous mass after being shot into it in order to examine and assess an ideal deformation behaviour. Furthermore, the invention relates to a tool for manufacturing the intermediate and, in particular, the projectile. The invention also relates to a method for manufacturing the intermediate and, if necessary, the projectile of the deformable bullet. Finally, the invention relates to a projectile deformed by use after it has hit the gelatinous mass in accordance with known test methods, is collected there and can be assessed.
It is known to form solid bullets, in particular, partial fragmentation bullets, with an unfilled cavity formed in the region of the ogive, which has a large tip opening at the ogive tip, the diameter of which frequently amounts to more than 50% of the bullet calibre. It is known to incorporate a plurality of notches in the ogival wall surrounding the cavity, which, when hitting the gelatinous mass, cause a mushroom-shaped or sepal-shaped deformation of the wall bent radially outwards. An example of such a notched wall of the ogive section of the projectile is known from WO 2015/061662 A1. The well-known bullet head has a very large ogive tip opening, at which the gelatinous mass can enter the cavity to cause the above-mentioned desired deformation. However, it has been shown that, the central ogive tip opening in the case of striker bodies with a greater hardness, such as is the case with gelatinous masses surrounded by textile materials, in the case of plaster concrete sheets, etc., this ogive tip opening is clogged by the material of greater hardness, which is why the gelatinous mass, which builds up the hydraulic pressure, cannot penetrate into the cavity, thereby not resulting in the desired mushroom-shaped deformation structure.
Furthermore, it is known to produce a projectile or bullet head with the help of a so-called intermediate or intermediate product, wherein a cold-forming process, such as deep-drawing, is used. An intermediate for manufacturing a projectile of a projectile, in particular, a deformable bullet or partial fragmentation bullet, similar to the generic object is known from U.S. Pat. No. 5,259,320. Accordingly, a blank made of copper is inserted into a cylindrical die and cold-formed by means of a mandrel or stamp, by which the mandrel penetrates into the blank in the axial longitudinal direction in order to provide it with a recess starting from the ogive side to be formed. By means of the die and the mandrel, the ductile material escapes, thereby forming the desired intermediate for the projectile. The mandrel can have a pyramidal shape with four flat inclined flank surfaces, which flow into straight dividing edges. A corresponding negative profile is pressed in the blank. The mandrel can have a conical structure to form a corresponding negative cone shape in the blank. The manufactured intermediate is provided with a closed, externally cylindrical wall and a centred press recess incorporated within the press end section. The wall runs completely and seamlessly in the circumferential direction around the press recess. In a subsequent cold-forming process, the wall is transformed into an ogival tip to produce the final product of the projectile. In this process, a completely closing inner surface contact is created in the end region of the jacket, which provides a closed cavity within the ogive of the projectile. The cavity is completely closed in the circumferential direction of the wall forming the ogive.
It has been shown with the well-known cold-formed projectile that the deformation behaviour of the projectile does not take place as desired, particularly during standardized test methods. With all the various proposed known stamps for the deep-drawing of the intermediate, it has been shown that cone-shaped or pyramidal tools used for this purpose can easily break. The service lives of such tools is uneconomically low. It has also been shown in the case of the known deep-drawing by means of a mandrel that, in the circumferential wall, stress variations and material solidifications arise that allow for an uneven deformation of the impacting projectile with a low level of controllability. In particular, it has been shown that, during deformation by means of the particularly cone-shaped mandrel, external deep-drawing shafts (cusps) arise in the region of the wall/cavity, which makes an elaborate post-processing of the projectile necessary with regard to optimal dynamics.
It is an object of the invention to overcome the disadvantages of prior art, in particular, to improve an intermediate for manufacturing a projectile, in particular, a deformable bullet, a particularly deformed projectile of a deformable bullet, a tool for manufacturing the intermediate, and a method for the manufacturing the intermediate so that an optimized simple manufacturing is made possible and the deformation behaviour is optimized when hitting a gelatinous target, even in the case of its enveloping in accordance with a standardized process.
The task is achieved by means of the features of the main Claims 1, 6, 7, 11, 13 and 15.
Thereafter, an intermediate is provided for manufacturing a projectile, in particular, a deformable bullet consisting of a ductile cylindrical base body. The base body can be made of a homogeneous metal material, such as copper, copper alloy, brass, lead, etc. Preferably, the base body is made of a lead-free material. The base body can be made of a cut blank, which can be made, in particular, out of a cut ductile metal material. The base body is cold-formed according to the invention by means of pressings, in particular deep-drawing, and in particular using a stamp-die arrangement. The base body or blank to be formed to the intermediate forms as an intermediate a cylindrical, solid base end section, which preferably comprises an essentially flat end face to be directed towards the bullet casing. Furthermore, the intermediate comprises a press end section, which is diametrically opposite to the base end section in the axial direction of the projectile, wherein the press end section is formed with a central press recess incorporated by means of the pressing process and a jacket or wall limiting the press recess for the formation of an ogival shaped tip of the projectile. In addition, the intermediate can be provided with a jacket of a metal material or other suitable material, which completely covers the base body or core in the region of the base, the guide section (shoe) and up to the nose of the projectile intermediate, wherein, in particular, the nose-side end face remains open, so that access to the base body is possible. The jacket, in particular, surrounds the base body approximately completely in the circumferential direction. Only on the nose front side no jacket material is provided for the insertion of a forming tool. The jacket can be made of another or of the same material as the base body. For example, a homogeneous metal material such as copper, copper alloy, brass, lead, etc. can be used for the jacket. Preferably, the jacket is made of a lead-free material. Thereby, the base body forms the core of the intermediate of the bullet to be made of it. The core is surrounded by the jacket, in particular, being completely surrounded when the bullet is manufactured from the intermediate. The base body can preferably be two-piece, wherein a nose-side section is unaffected by the slotting, while a base-side region is formed by the slotting.
According to the invention, the wall to be formed into the ogive during the later forming process of the intermediate is formed with at least two slots extending in the axial direction of the intermediate, whereby a corresponding number of prongs or wall sections separated by the slots in the circumferential direction result. The slots or through slots completely push through the surrounding wall surrounding the cavity or the press recess radially so that, in the case of the intermediate according to the invention and also the projectile, there is a free radial access via the radial passage slots towards the cavity. Only when forming the slotted wall into an ogive section, the cavity is closed at least partially in the circumferential direction on the basis of lateral edges of structurally separated prongs formed by the slotting, thereby making contact or lying closely to one another, thereby forming a gap. Preferably, three, four, five, six or more slots or through slots can be incorporated into the wall. In a preferred embodiment, the at least two slots, in particular, exactly three or four slots (exactly three or four prongs as a result), are arranged in circumferential direction at the same circumferential distance to each other in order to form a point-symmetric slot/prong arrangement relative to the axial direction of the intermediate. According to the invention, the at least two slots separate the respective at least two prongs, which form the structure of the wall and are intended to limit a cavity in the circumferential direction of the intermediate, wherein in particular two adjacent prongs of the wall are associated with one slot. The prongs extend from a slotted base, which forms the base-end-section-side end of the slot, in the axial direction to a prong end or tip, which prong ends form the axial end of the wall and thus, the intermediate. According to the invention, the at least two slots extend by more than 10% of an axial total longitudinal expansion of the intermediate from the wall end towards the base end section. The total length of the extension of the slot to be considered should be the axial dimension from the wall end to the slotted base at the transition of two adjacent prongs. Due to the intermediate being a single piece, in particular the cold-forming, the respective prong grows towards the respective prong end in the axial direction from the base end section, which terminates geometrically through the slot in the axial direction, wherein the circumferential width of each prong of the at least two prongs preferably decreases in the axial direction towards the prong end continuously and evenly, whereby, in particular, the circumferential width of the slot lying between two prongs increases in the axial direction towards the wall end, in particular, gradually and/or continuously. In a preferred embodiment, the slotting can be continuous or have a slotted base for sealing the cavity or the press recess radially in the circumferential direction, wherein the slotted base is used radially on the outside to complete a continuous step-free, in particular, cylindrical outer side of the intermediate. In this case, the slotting can form a canal structure extending in the longitudinal direction of the bullet, which is open to the hollow interior. A depth of the slotting from the cavity towards the slotted base can vary, in particular, continuously increase in the longitudinal direction towards the base of the intermediate. In particular, the slotting is fully incorporated within the base body and, if necessary, in the jacket surrounding the base body. Not only the approximately cylindrical outer side of the prongs, but also the outer side of the slotted base of the base body or of the jacket connecting two adjacent prongs allow for a completely cylindrical outer side of the intermediate to form. The slotted base is continuous in the circumferential direction on the cavity side, in particular, equal in width, wherein the slotted base extends continuously towards the longitudinal axis of the intermediate in the common cavity floor of the inner cavity. The inner sides of the prongs formed by the slotting also terminate in the cavity floor.
The slotting and thus the desired inner hollow profile is shaped in such a way for the intermediate that, when forming the intermediate into the bullet, the prongs incorporated by means of the slotting serve as gripping arms and/or a separate tip, made of plastic for example, is inserted and attached to it for the formation of the nose of the projectile, in particular, being pressed. During the forming process of the intermediate of the bullet, in which the slotted region is formed radially inwards utilising the slotting, this can be used to achieve a clamping of the tip. The intermediate shape according to the invention correlates deformation of the blank without the formation of deep-drawn shafts, which is very easy to realize but even. The mould forming the shape of the intermediate according to the invention provides a space for the material of the intermediate to be formed later on to escape due to the formation of the slots between (in the circumferential direction) the prongs, in particular the material of the prongs. When pressing or deep-drawing in accordance with the cold-forming process, undesirable corrugated formations are largely avoided. In addition, a bullet is provided with the intermediate according to the invention, which is realized exclusively by means of a cold-forming process, in particular, without having to use machining methods. The cold-formed intermediate/projectile also achieves the desired partial fragmentation deformation behaviour without resulting in a splintering of the bullet when hitting into gelatinous mass in accordance with standardized test methods.
In a further embodiment of the invention, the at least two slots extend by more than 20%, 25%, 30%, 35%, 40%, 45% or 50% of the total axial extension of the ogive to still be designed later in the region of the slotted press end section provided with a press recess. Preferably, the at least two slots extend across the entire axial longitudinal expansion of the press end section in such a way that the ogive to be formed is completely realized by the wall formed with at least two slots, precisely three or four of them. The prongs or wall sections elongated by the corresponding length of the slots form the ogival wall to limit the cavity of the projectile, which is designed to be open at the ogive tip with an opening having a clear cross-section according to the invention that is less than 20%, 15%, 10% or 5% of the calibre cross-section of the projectile.
The at least two slots define a circumferential width to be measured in the circumferential direction, in particular, thereby growing from the base end section at the level of the slotted base. In a further embodiment of the invention, the circumference width of at least two slots increases from the slotted base towards the jacket tip, in particular, in a continuous manner. Preferably, the gradient of the flank edge of the prong limiting the slot is essentially constant in its progression from the slotted base towards the wall tip, in particular, in a main slotted base between the slotted base towards the wall end, wherein the slotted base is rounded in the same way as the wall tip also has a rounding with a changed gradient. In addition or as an alternative, the at least two slots of the slotted base can open continuously in the axial direction, wherein the slot opening is at a maximum at the wall tip in particular.
Preferably, the at least two prongs are essentially identical in shape and measurement in order to form a symmetrical, in particular, a point-symmetric structure of the intermediate at least in the region of the press end section or completely, which will largely form the ogive of the projectile. The at least two prongs grow from the slotted base and the press recess arc in the axial direction. The prongs can also be shaped as spikes, wherein they may not necessarily, but can preferably run into a pointed end, which is preferably rounded, wherein the prong end can extend in the circumferential direction in an obtuse manner.
In a preferred further embodiment of the invention, the design shape of the respective prong is decisive. Preferably, an inner surface facing the press recess of the respective prong is convex in the circumferential direction and/or in the axial direction. Preferably, in a cross-sectional view of the respective prong, a material thickness of the prong that increases towards the centre of the circumferential direction is provided, wherein, in particular, the outward-pointing outer surface of the prong is cylindrical, and, in particular, already essentially corresponds to the calibre of the projectile. Two flank surfaces, shaped towards the axial centre axis of the prongs, in particular, being axis-symmetrical, on the inner side of the prong extend from the edge of the prong extending in the axial direction all the way to its centre, thereby limiting the slot. They can be flat, concave or convex. Preferably, the two flank surfaces, which abut each other, are at an angle to each other, wherein the intersection of the flank surfaces essentially corresponds to the centre axis of the prong, along which the prong is designed to be strongest and has the greatest material thickness. Preferably, the centre region of the prong is formed with a material extension maximum, which extends as an edge from the prong tip to the base-end-side section. Preferably, a convex inner surface in the circumferential direction essentially on half circumference width of the prong has an edge-like projection extending into the press recess, which preferably extends in a straight line from the axial height of the slotted base to the prong tip. In particular, the flat, convex or concave flank surface of the prong can descend from the edge-like projection towards a lateral edge of the prong limiting the respective adjacent slot as far as the material thickness of the prong is concerned. Preferably, the edge- or bar-like projection is rounded towards both flank inner surfaces.
In a convex embodiment of the inner surface of the prong in the axial direction, the convex inner surface is preferably designed without a projection.
In a preferred embodiment of the invention, the outer surfaces of the prong are cylindrically formed, in particular, according to the die used for the method. The lateral boundary edge of the prong represents the end of the cylindrical outer side of the prong, at which there is a profile break towards the inner surface of the prong, which inner surface has the convex shape in the circumferential direction or in the axial direction.
In a further embodiment of the invention, instead of an edge- or bar-like projection extending into the process recess, a recess which also extends in a straight line from the prong tip towards the axial height of the slotted base like a groove or a notch can be formed, which interrupts the convex design of the flank inner surface.
In a further embodiment of the invention, the at least two prongs define a wall thickness in a circumferential cross-slot view. The wall thickness of the prong preferably increases from a lateral edge limiting the respective adjacent slot (transition between the cylindrical outer surface and the inner side of the prong) at a certain axial height and, in particular, along the entire axial extension towards a wall thickness maximum. From the wall thickness maximum, the wall thickness can decrease again to the opposite lateral edge, in particular, continuously. Preferably, the wall thickness maximum in circumferential direction is formed essentially in the centre of the prong. Alternatively, instead of the wall thickness maximum, a reduction of the wall thickness in the form of a recess can be provided, which abuts a wall thickness elevation. In such an embodiment, the respective prong comprises two wall thickness maxima, which are limited by the recess. From the respective wall thickness maximum, the wall thickness decreases towards the adjacent lateral edge, which limits the slot. The wall thickness maximum extends over a region of the axial extension of the prong, particularly in the axial centre range of the prong. Preferably, the wall thickness maximum can extend essentially from the prong end to the axial height in the region of the slotted base and beyond up to the press recess floor.
In a preferred embodiment of the invention, the press recess extends over more than 50%, in particular, between 50% and 80%, in particular, of more than 60%, preferably between 60% and 80%, in particular, in the range of 75% of the axial total extension of the intermediate or projectile. The press recess defines a recess ground, in the centre of which the slotted bases of at least two slots extend radially and, if applicable, axially towards the cylindrical outer side. The die-recess-free base end section consists of the solid full material of the blank and is limited by the press recess floor and the slotted bases extending away from it in the axial direction. By the jacket being slotted, the press end section of the intermediate extends away from this boundary.
The projection formed on the inner surface of the respective prong, in particular the wall thickness maximum, preferably extends in the axial direction beyond the axial height of the slotted base, in particular, essentially completely up to the press recess floor. Preferably, the project into the recess ground passes continuously without forming a profile projection. The same applies to the recess in the region of the inner surface of the respective prong, which can be formed instead of a projection under certain circumstances.
Preferably, a recess ground, which represents the dead-end region of the press recess, is spherically shaped. Alternatively, the recess ground can also be flat, which has a maximum width of 10 mm or a few millimetres. The recess ground can extend radially in such a way that it merges into a slotted base, in particular all slotted bases of the at least two slots, in particular, continuously. The slotted bases can, of course, be shaped as strips or like a groove, rounded and terminates into a corresponding form of the central recess ground.
In a further embodiment of the invention, the outer side of at least two prongs is executed cylindrically, while the inner surface curves convexly, namely towards a prong tip, wherein the curvature gradient can gradually increase with respect to the vertical. In a preferred embodiment of the invention, exactly three prongs are provided for the wall of the press end section, which are arranged at an angle of 120° at an equal circumferential distance to each other. Alternatively, exactly four prongs can be provided, whose centre axis are arranged essentially at a 900 circumferential distance to each other. The respective prongs have an identical or similar shape and an identical cross-section, in particular, across the entire axial progression from the recess ground to the prong tip.
In a further embodiment of the invention, exactly two prongs are provided, wherein both slots separating the prongs on both sides narrow in a radial progression towards a centre (the longitudinal axis of the intermediate) and expand from the centre again radially outwards. The exactly two prongs are identically shaped and lie symmetrically opposite each other.
The deformation control on impact, for example, into an ideal gel-like substance, is realized by the special embodiment of at least two prongs in conjunction with the press recess and, ergo, the at least two slots. The convex region of the inner side of the prong causes a strengthening in the region of the weakening of the press end section of the intermediate incorporated by the press recess. The slot, which limits two prongs and decreases from the pointed end to the slotted base, strengthens the prong foot that enters the base end section. The dimensional stability exists across the entire axial progression and in the cross-section along the axial progression of the prong from the recess ground to the prong end.
In a preferred embodiment of the invention, the stamp, which should be used for profiling the press end section for the intermediate, is formed according to a Phillips screwdriver, the diameter of which is greater than the diameter of the intermediate. Two-bar, three-bar, four-bar or multi-bar screwdrivers can be used. It is the bars of the blade of the Phillips screwdriver that incorporate the slots into the blank to form the intermediate, wherein the central section of the screwdriver forms press recesses.
Furthermore, the invention relates to a projectile for a deformable bullet, which is made of a ductile blank, which is firstly being cold-formed into the intermediate. The projectile is ultimately realized by means of a forming process. According to the invention, the projectile should be realized by means of the intermediate according to the invention.
In addition, the invention relates to a projectile, in particular, of a deformable bullet or partial fragmentation bullet, which has a cylindrical, solid base end section and an ogive section connecting to the base end section as a single piece with a wall for the extensive enclosing of a particularly unfilled cavity and a centred opening at a tip of the ogive section with a clear opening cross-section of less than 20%, 15%, 13%; 10%, 8% or 5% of the calibre cross-section of the projectile defined by the base end section. Preferably, the maximum dimension, which is the longest linear dimension to be measured, for example, in the case of a Y-shaped opening, a star-shaped opening, an I-shaped opening, for example, from a star limb to the opposite boundary wall is less than 17%, 15%, 13% or 10% of a diameter of the base end section. Surprisingly, it has been shown that such a dimensioned ogive tip opening is sufficient to break through harder materials, such as elastic materials or textile fabrics, without this being accompanied by occupancy or blockage of the ogive tip opening. When entering the gelatinous mass in accordance with the standardized test methods, the gelatinous material can then easily penetrate into the empty cavity of the ogive section in order to build up the hydraulic pressure, which causes the desired partial deformation of the projectile.
Furthermore, the invention relates to a projectile, in particular, a deformable bullet. The projectile comprises a cylindrical solid base end section, which preferably comprises a flat end face, which in a further embodiment can have a central recess or indentation, which is axially aligned in the direction of the ogive tip. The base end section is used to be inserted into a case of the bullet or ammunition. Furthermore, the projectile has a press end section lying diametrically opposite to the base end section in the axial direction, which essentially corresponds to that of the intermediate. The press section has a central press recess incorporated by pressing and a wall limiting the press recess, which is formed into an ogival shaped point. This creates a cavity within the projectile in the region of the ogive or the wall. The cavity is unfilled and empty so that, in particular, in accordance with the standardized test method, gelatinous material can penetrate into the cavity in order to build up the hydraulic pressure, which is supposed to trigger the deformation behaviour according to the invention. According to the invention, the wall of the projectile has at least two wall sections. It is clear that the above-mentioned prongs or wall sections of the ogive form the projectile as soon as the prongs are formed from their outer surface-side cylindrical orientation towards the pointed-arched ogive. The ogive should preferably be tangent ogive in shape. In the projectile according to the invention, adjacent wall sections are bent in the circumferential direction in such a way that they come into contact with each other at least in sections so that, in the region of contact of the wall sections, a cavity formed by the press recess, in particular, during the formation of the intermediate, is enclosed in the circumferential direction (i.e. in the region of the sectional contact of the lateral edges of the ogive sections). The enclosure is complete in the circumferential direction as soon as the lateral edges make contact. The lateral edges do not have to be completely in contact, but, as indicated above, contact can be made in sections.
In a preferred embodiment of the invention, the cavity, which is to be limited by the wall sections in the circumferential direction, is not fully opened, but has at least three openings, a central opening at the ogive tip, as already stated above, and at least two side openings in the region of the slotted bases, which adjust in the creation of the intermediate. The number of side openings depends on the number of slotted bases. Preferably, the side openings are formed identically in the clear cross-section. The cross-section of the side openings can have an essentially triangular, heart or spade shape and can extend across a small region up to a range of more than 30% of the axial extension of the cavity.
In a further embodiment of the invention, the projectile is manufactured on the basis of the intermediate according to the invention. The completed intermediate is then cold-bent to form the respective ogive section. For this purpose, it can be inserted into an appropriate die.
In a preferred embodiment of the invention, a contact length of adjacent ogive portions at their lateral edges is over 20%, 30%, 40%, 50%, 60%, 70%, 80% or respectively 90% of a total length of the lateral edges of the respective ogive sections. The lateral edges are measured from the tip of the respective ogive section to a slotted base. Preferably, there is contact of the lateral edges along the entire length of the lateral edges along the entire length of the lateral edges so that the ogive sections making contact completely close the cavity. A complete closure is difficult to achieve in terms of production so that a small opening of less than 2 mm or 1 mm can be assumed to remain in the zone of the slotted base, which does not affect aerodynamics and impact deformation. This side opening, which results from the slotted base in the intermediate and the subsequent forming towards the ogival shape of the wall, can extend by less than 1 mm along the lateral edges of the wall sections or over an essential region along the axial extension of the cavity, up to more than 50% of the axial length of the cavity.
A flat or linear contact of the lateral edges for completely circumferentially enclosing of the cavity in the region of the contact is not necessary according to the invention. Of course, the ogive formed by the bent wall sections along the lateral edges can have a narrow gap (without contact), wherein a gap of less than 1 mm or 2 mm can be set independently of the calibre size. Preferably, however, a longitudinal contact between a zone of the lateral edges of adjacent wall sections is advantageous, in particular, to define the opening edge of the centred ogive tip opening. The contact range along the lateral edges can be less than 3 mm, preferably between 1 mm and 5 mm, more preferably, at a calibre of 9 mm.
In a preferred embodiment of the invention, the respective tips of the ogive portions are formed into a particularly substantial circular opening, which lies centred to the longitudinal axis of the projectile at the tip of the ogive section and is open towards the in particular empty cavity, wherein, in particular, the opening cross-section of the mouth comprises a Y-shape, an I-shape or a star shape. A plurality of opening tongues can meet at a common opening centre, wherein the opening tongues are arranged essentially at an equidistant circumference section with relation to one another. The opening centre is centrally located, thereby being coaxial to the longitudinal axis of the projectile.
Furthermore, the invention relates to a projectile, in particular, a deformable bullet. This projectile according to the invention can be combined with the above-mentioned projectile detail. Preferably, the projectile according to the invention is made of a ductile material, such as copper, a copper alloy, brass or the like. The projectile is dimensioned and shaped in such a way, in particular being cold-formed, that, after the projectile has been fired and hits into a gelatinous mass, in which it should also get stuck in particular, the projectile is deformed in such a way that at least two prongs that are bent radially outwards and in the projectile's longitudinal direction are formed by a particularly essentially cylindrical and largely undeformed base end section. The prongs are made of a solid material as a single piece with the base end section. Due to the slotting through the intermediate and the resulting side passage openings in the wall limiting the cavity, a deformation joint at the axial height of two adjacent slot arcs is created, whereby a defined unfolding/swivel deforming is realized radially outwards and back into the axial direction. The prongs have a kind of sepal shape in the deformed state and extend accordingly from the base end section. Preferably, it is the above-described prongs with respect to the intermediate, which are bent radially inwards after the intermediate production for the formation of the ogive. The opposite radial fungus-shaped folding deformation is caused by the hydraulic pressure building up in the cavity upon entry into the gelatinous mass, which was limited by the respective prongs. Via the opening at the ogive tip of the projectile, gelatinous mass enters the cavity upon impact and causes a splitting and folding-out of the prongs in the above-mentioned manner, wherein a long slot length realizes a wide radial extension of at least two prongs. Surprisingly, in the use of the intermediate according to the invention and thus of the projectile according to the invention, it became apparent that, in addition to the at least two prongs, other tooth-shaped, prong-shaped or jagged-shaped radially outward-pointing nib- or tooth-shaped projections form, which lie in the transition between two adjacent prongs. Between the at least two bent-back prongs, two further identical or at least similarly shaped, radially protruding pointed teeth are formed by the impact deformation within the gelatinous mass. The at least two bent-back teeth also extend as a single piece from the base end section of the projectile, wherein the majority of kinetic energy of the projectile is abolished by deformation of the outwardly bent prongs and the outwardly bent intermediate teeth. According to the invention, it has been shown that the radial extension of at least two teeth is less than that of the at least two adjacent prongs.
Preferably, there are exactly three or exactly four radial prongs curved towards the outside, wherein a shorter pointed tooth is respectively formed between two adjacent prongs.
The radial extension of the at least two teeth is less than that of the at least two prongs. Preferably, the radial extension of at least two teeth is less than 50% of the radial extension of the prongs. The dimensional difference in the radial direction between the prong and the teeth can be set by the length of the slots incorporated into the intermediate of the projectile. It has surprisingly been shown that wall sections and the slotted base structures becoming apparent in the process, in particular, as a rounded or flat slotted base surface, form due to the through slots incorporated into the intermediate. In interaction with the prong, in particular, due to the convex curvature on the inner surface, a specific deformation in the region of the slotted base is forced, which leads to the above-mentioned intermediate tooth structure according to the invention in the deformed projectile.
It is the region of the slotted base in combination with the solid base end section and the adjacent prongs, which is why the pointed teeth form adjacent to the bent prongs in the transition region to the base end section, which also protrude radially outwards in a mushroom-like manner.
Preferably, the base end section of the deformed projectile has a deformation-side central recess, the floor of which results almost unchanged from the press recess floor of the intermediate. From this recess, the at least two prongs and the at least two teeth nib-like radially extend towards the outside, wherein the prongs have a convex top side. The at least two teeth can also have a convex radial extension. However, it may be that these are not clearly formed, particularly in the case of short teeth of less than 2 mm.
In a further embodiment of the invention, the at least two deformed prongs of the projectile and/or at least two deformed teeth of the projectile have a central material reinforcement, which, in particular, extend in a straight line in the longitudinal direction of the respective prongs and/or the respective tooth, in particular, from the central recess on the base end section. This reinforcement is realized by means of a material accumulation, which is already provided in the intermediate according to the invention.
In addition or as an alternative, in the case of the deformed projectile, there can be a constriction formed between a prong and the adjacent intermediate tooth, in particular, in the case of viewing axially, which constriction separates the respective tooth from the respective prong.
Furthermore, the invention relates to a tool, such as a stamp or a mandrel, for pressing a blank used in a cylindrical die made of a ductile material, such as copper, a copper alloy, brass or the like. The blank can be a single-piece base body or be made of two pieces, which has a base body designed as a core, which is surrounded by a jacket that is also made of a ductile material. In the case of such a blank, in particular, a hunting bullet, in particular, the partial fragmentation bullet is formed. The tool is used to form, from the blank, an intermediate, in particular, according to the invention or a projectile according to the invention. According to the invention, the tool has a press head, which is shaped in accordance with a blade of a slotted screwdriver, in particular, an SL-type, a PH-type, or a PZ-type slotted screwdriver, wherein, in particular, the maximum diameter of the blade is larger, in particular, by at least 0.5 mm, 1 mm or 2 mm, but preferably less than 5 mm, than the calibre of the projectile to be created.
In a preferred embodiment of the invention, the press head is made of a hardened material, such as a carbide, which can be selected from the group of known carbides. In particular, the press head can be selected from a hardened steel with a Vickers hardness of more than 55 HV 5. It is clear that a surface-hardened steel can also be used for the press head.
Furthermore, the invention relates to a method for manufacturing an intermediate, in particular, according to the invention for manufacturing the projectile of a bullet. Preferably, the invention relates to a method for manufacturing a projectile according to the invention, in particular, on the basis of the intermediate according to the invention. In a method according to the invention, a cylindrical die is used, which should preferably correspond to the calibre of the bullet. A blank made of a ductile material, such as copper, a copper alloy, brass or the like, is inserted into the cylindrical die. To create the intermediate according to the invention, a press head is inserted into the die to cold-form the blank, in particular to deep-draw it. Preferably, in the method according to the invention for the creation of the intermediate, in particular, the projectile, a cold-forming process is exclusively used. Preferably, all machining manufacturing processes are dispensed with. It has been shown that a precise projectile optimized with regard to deformation characteristic can be provided if a slotted screwdriver blade is used for the cold-forming of the blank for the press head. Surprisingly, it has been shown that even classic conventional blade shapes, such as the SL-type, the PH-type, of the PZ-type are suitable for using the stamping tool according to the invention for the cold-forming of the blank.
Preferably, the method according to the invention is realized in that a tool according to the invention is used.
With regard to the tool according to the invention, it should be noted that, in a cross-sectional view, there can be an axis-symmetric gradient with relation to the axial direction of the tool between the bars of the blades of the screwdriver forming the slots in the blank. Between the inclined bars, there should be an angle greater than 450 and less than 80°, preferably between 500 and 70°, in particular, being about 60°.
Preferably, the press head according to the invention for forming the slots has three bars or exactly four bars, which serve to incorporate the slots radially extending from the central cavity into the intermediate and/or should be arranged at equidistant circumferential distances to each other. In the case of bars, the engaging edges for the formation of the slotted bases should be either rounded or flat, wherein the bars, inclined from a tip falling back with the central section of the tool, can extend radially outwards. It is clear that the angle of inclination should be the same for all bars, be it two, three, four or more. The bars are used to form the slots described above, the slot width of which can be adjusted according to the bar width of the tool. Preferably, the bar widths should be less than 2 mm with a calibre of 9 mm for example.
The blade comprises a flank surface arrangement between adjacent blades, which should be concave at least in the circumferential direction and/or in the axial direction when viewed as a whole. With the concave transition surfaces between the bars, the desired convex top side contours of the prong of the intermediate are formed, which leads to the intensified desired deformation and the associated energy reduction in the projectile according to the invention.
The known, in particular standardized test method mentioned above, in which the deformation behaviour of a projectile is to be analysed by firing it into a gelatinous mass (gelatine block), can be based on the following test procedures, both of which are to be regarded by reference here as part of the disclosure. On the one hand, the FBI protocol, “FBI Ammunition Protocol—Brass Fetcher Ballistic Testing,” is referenced. In addition, the technical directive (TR), cartridge 9 mm×19, is reduced in pollutants, in particular, the 2009 status, the police, the states and the federal government. The editorial team is conducted by the Police Technical Institute (PT!) of the German Police College (DHPol). The procedures indicated there for providing an ideal test environment should be part of the disclosure of the present documents.
Further characteristics, advantages and features of the invention are illustrated by the following description of preferred embodiments of the invention on the basis of the enclosed drawings which show in the following:
In
In
The intermediate 1 comprises a cylindrical, solid base end section 3 with a flat end face 5. The base end section 3 comprises an edge rounding on the flat end face 5 for easy insertion into a case of an ammunition (not shown).
In axial direction A, the base end section 3 passes into a press end section 7, wherein the transition between the base end section 3 and the press end section 7 can be defined by a press recess 11 incorporated into the blank. In the top view in accordance with
From the recess 11, the cavity 18 (see
In the embodiment in accordance with
As is apparent in the cross-sectional views of the
The material accumulation 31 extends essentially in a straight line from the prong tip 25 to the prong foot at the transition region to the base end section 3. As is apparent in
As is apparent in
After the intermediate 1 has been deep-drawn without the need for applying further machining manufacturing measures, the intermediate 1 is ready to be formed into a finished projectile. The forming process for the formation of the projectile 37 mainly consists of forming the press end section 7 with the prongs 13 separated by slots into an ogive section 20. Thereby, the prongs 13 are so radially deformed inwards in such a way that the lateral edges 17 of the prongs 13 enter into or approximately enter into contact, as is shown in
In the embodiment according to the invention in accordance with
After the intermediate 1 has been deep-drawn without the need for applying further machining manufacturing measures, the intermediate 1 is ready to be formed into a finished projectile 37. With regard to the projectile 37 in accordance with
The following description, an example of a deep-drawing tool to create the intermediate 1 in
In the following, the press head/tool according to the invention in accordance with
The maximum outer diameter of the tool 51 according to the invention in accordance with
As in evident in
It has been shown that using the tool 51 according to the invention, namely the press head or the blade of a correspondingly shaped slot screwdriver, a deep-drawing process can be carried out on the blank of ductile material, such as ductile metal, such as copper, a copper alloy, brass or the like, for the formation of the intermediate 51, which does not suffer from the difficulty of the earing, meaning the formation of waves. Extensive post-processing is not necessary when using the tool according to the invention.
Another preferred embodiment of an intermediate 1 according to the invention show
The intermediate 1 in accordance with
The prongs have a convex, belly-shaped top side towards the press recess 11, which reaches a maximum in the form of the material reinforcement 31. The prongs 13 extend in accordance with the unformed intermediate 1 on the outside cylindrically straight and inside convex slightly inclined outwards towards the prong tips 25.
In
Unlike the projectile in accordance with
The opening 45 centred in the longitudinal direction of the projectile at the top of the ogive section is essentially square with rounded corners. The cross-sectional surface of the opening 45 is also significantly less than 20%, 15% or 10% of the cylindrical cross-sectional surface of the base end section 3. The small cross-sectional surface prevents that stronger components seal the opening against the gelatinous mass, whereby the gelatinous material cannot penetrate into the cavity 18 in order to build up the hydraulic forces for splitting the prongs 13 there.
The tool 51 according to the invention, using which the intermediate in accordance with
In contrast to the embodiment in accordance with
In
In contrast to the above embodiments, the intermediate 1 in accordance with
In accordance with the top view of
As is clearly apparent in
In contrast to the other embodiments, the slotted base 33 rises particularly with regard to the longitudinal axis A at an angle of about 30° to 60°, approximately between 400 and 50°. The slotted base essentially runs in a straight line towards the outside in a radial manner.
The projectile manufactured, and in particular, formed from the intermediate 1 in accordance with
As is evident in
In
The embodiment of the intermediate 1 in accordance with
The intermediate 1 in accordance with
In
For a large part of the edge of the side 17 there is a contact-like installation of the lateral edges 17 to each other to limit the cavity 18 in the circumferential direction.
In contrast to the embodiments described above, the intermediate 1, at the pointed end of the ogive section 20, comprises a star shape whose clear cross-sectional surface is significantly less than 20% of the cross-sectional surface of the base end section 3. In particular, the cross-sectional surface of the opening is less than 15% or 10%.
The upper final edge in the region of the star-shaped central opening 45 forms the end of the respective prong 13, wherein lateral edges 17 lie on one another, thereby making contact.
In
In
The intermediate 1 in accordance with
Also, the central opening 45 of the projectile 37 in accordance with
The cavity 18 is open to the side via the side openings 41 and via the central opening 45. About half of the axial length of the lateral edges 17 is in contact, so that there the cavity is closed in the circumferential direction. The other half of the lateral edges 17 is spaced for the formation of the side opening 41.
In
Ultimately, with
The surface facing to the press recess 11 is convex in shape, wherein its thickness decreases in the axial progression towards the end 71.
The intermediate shown in accordance with
The tool 51 according to the invention in accordance with
In
As evident in
As is apparent in the top view of
After the intermediate 1 has been deep-drawn without the need for applying further machining manufacturing measures, the intermediate 1 is ready to be formed into a finished projectile, in particular, a partial fragmentation bullet. The forming process for the formation of the projectile 37 mainly consists of forming the press end section 7 with the prongs 13 separated by slots into a suitable ogive section 20, in particular, being pressed. In this process, the prongs 13 are radially deformed inwards in such a way that the lateral edges 17 of the prongs 13 enter into contact, as is shown in
A variant to the projectile 37 is shown in
The projectile, in particular, a partial fragmentation bullet 37 in accordance with
The projectile 37, in particular, a partial fragmentation bullet resulting from intermediate 1 in accordance with
The embodiment of the intermediate 1 according to the invention in accordance with
The embodiment of the intermediate 1 according to the invention in accordance with
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2017 011 359.9 | Dec 2017 | DE | national |
This application is a continuation application of Ser. No. 16/770,852 filed Jun. 8, 2020, which is a U.S. national phase application filed under 35 U.S.C. § 371 of International Application No. PCT/EP2018/084238, filed Dec. 10, 2018, designating the United States, which claims priority from German Application No. 10 2017 011 359.9, filed Dec. 8, 2017, which are hereby incorporated herein by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16770852 | Jun 2020 | US |
| Child | 18076554 | US |
