Rolling die

Abstract

The invention discloses a rolling die which comprises a first die and a second die. The top of the first die comprises a material binding part and a material pushing part which are arranged in the first direction, the material binding part is provided with a material binding protrusion protruding in the second direction perpendicular to the first direction, and the lower surface of the material binding protrusion protrudes in the second direction and inclines upwards. The material pushing part is provided with a material pushing protrusion protruding in the second direction, the upper surface of the material pushing protrusion is provided with a first inclined face inclining upwards in the first direction, and the starting end of the first inclined face is located below the lower surface of the material binding protrusion; the second die is suitable for moving in the first direction relative to the first die and is matched with the material bundling part and the material pushing part to form a groove and a clamping ring of the fastener, and due to rolling forming, the process is simple, the material utilization rate is high, and the production efficiency is high. And through the material rolling and material pushing composite forming technology, the rolling force is balanced, the service life of the mold is long, and the production speed is greatly increased.

Description

Technical Field

[0001] The present invention relates to the field of fastener processing, and particularly to a forging die. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening connections and are extremely widely applied. With the development of the automotive industry and the progress of technology, the connection and fastening technology has also developed rapidly, and riveted fasteners have been widely promoted and applied. In particular, as Figure 1 shown in the riveted bolt with a retaining ring, which is composed of a head 91, a thread 92, a serrated tooth 93, a retaining ring 94, and a groove 95. Among them, the serrated tooth 93 is arranged on the lower surface of the head 91, the retaining ring is arranged between the threaded rod and the head, and the retaining ring and the lower surface of the head enclose the groove 95.

[0003] The traditional forming process for the groove and the retaining ring of this riveted bolt is cold heading to form a smooth nail + turning the groove + thread rolling, that is, after cold heading the blank, then machining the outer shape of the groove by turning, and finally thread rolling. The above process has low processing efficiency and low material utilization rate, and it is difficult to mass produce on a large scale. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects or problems in the background art or to provide a material basis for overcoming the above-mentioned defects or problems in the background art, and to provide a forging die.

[0005] To achieve the above purpose, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0006] Solution 1, a forging die, comprising

[0007] a first die, the top of which includes a material piercing part and a material pushing part arranged along a first direction. The material piercing part is provided with a material piercing protrusion protruding along a second direction perpendicular to the first direction, and the lower surface of the material piercing protrusion protrudes along the second direction and slopes upward; the material pushing part is provided with a material pushing protrusion protruding along the second direction, and the upper surface of the material pushing protrusion is provided with a first inclined surface sloping upward along the first direction, and the starting end of the first inclined surface is located below the lower surface of the material piercing protrusion;

[0008] a second die, which is adapted to move relative to the first die along the first direction and cooperate with the material piercing part and the material pushing part to form the groove and the retaining ring of the fastener.

[0009] Option 2, based on Option 1, the material-binding protrusion is provided with a first side wall, a first vertical surface and a second side wall which are sequentially connected along a first direction, the first vertical surface is located in the second direction of the first side wall and the second side wall, the first side wall and the second side wall are inclined surfaces, the first side wall gradually approaches the first vertical surface along the first direction, and the second side wall gradually moves away from the first vertical surface along the first direction.

[0010] Option three, based on Option one, the material-binding portion is also provided with a second vertical surface and a first surface, the material-binding protrusion protrudes along the second direction relative to the second vertical surface, the top end of the second vertical surface is connected to the lower surface of the material-binding protrusion, and the bottom end of the second vertical surface is connected to the first surface.

[0011] Solution 4: Based on Solution 1, the top surface of the material-binding protrusion is a plane.

[0012] Option 5, based on Option 3, the pushing portion is also provided with a third vertical surface, the pushing protrusion protrudes along the second direction relative to the third vertical surface, and the upper surface of the pushing protrusion is also provided with a second inclined surface, the second inclined surface is connected to the third vertical surface, and protrudes along the second direction and tilts downward, the second inclined surface is located in the first direction of the first inclined surface; the third vertical surface is located on the side of the second vertical surface away from the second mold.

[0013] Solution six, based on solution five, the surface of the push protrusion away from the third vertical surface is a fourth vertical surface, and the top of the fourth vertical surface is connected to the first inclined surface and the second inclined surface.

[0014] Solution seven, based on Solution one, the first mold is also provided with a first tooth pattern, the first tooth pattern is located below the tying part and the pushing part, and the second mold is provided with a second tooth pattern adapted to the first tooth pattern.

[0015] Option 8, based on Option 1, the second mold is provided with a matching part corresponding to the tying part and the pushing part, the matching part is provided with a matching protrusion protruding in the opposite direction of the second direction, the upper surface of the matching protrusion is provided with a fourth inclined surface and a third inclined surface arranged along the first direction, the fourth inclined surface protrudes in the opposite direction of the second direction and inclines downward; the third inclined surface gradually inclines downward along the first direction.

[0016] Solution nine, based on Solution eight, the mating portion is further provided with a fifth vertical surface, the mating protrusion protrudes in the opposite direction of the second direction relative to the fifth vertical surface, and one end of the fourth inclined surface and the third inclined surface are connected to the fifth vertical surface.

[0017] Solution Ten. Based on Solution Nine, the mating protrusion further has a sixth vertical surface, and one ends of the fourth inclined surface and the third inclined surface away from the fifth vertical surface are connected to the sixth vertical surface.

[0018] As described above for the present invention and its preferred embodiments, compared with the prior art, the technical solutions of the present invention and its preferred embodiments have the following beneficial effects due to the following technical means:

[0019] 1. In Solution One and its preferred embodiments, a forging die includes a first die and a second die.

[0020] The top of the first die includes a blanking part and a pushing part arranged along a first direction. The blanking part is provided with a blanking protrusion protruding along a second direction perpendicular to the first direction. The lower surface of the blanking protrusion protrudes along the second direction and slopes upward. The pushing part is provided with a pushing protrusion protruding along the second direction. The upper surface of the pushing protrusion is provided with a first inclined surface sloping upward along the first direction. The starting end of the first inclined surface is located below the lower surface of the blanking protrusion;

[0021] The second die is adapted to move relative to the first die along the first direction and cooperate with the blanking part and the pushing part to form a groove and a retaining ring of a fastener. Specifically, when the second die moves relative to the first die along the first direction, the smooth nail rolls to start forging. During the forging process, the blanking protrusion extrudes the smooth nail to preliminarily form a "preliminary groove", and the lower surface of the blanking protrusion can form the upper surface of the retaining ring of the fastener; the pushing protrusion is connected after the blanking protrusion. At this time, the smooth nail contacts the pushing protrusion, and under the action of the extrusion force, the smooth nail is gradually pushed and lifted along the first inclined surface on the pushing protrusion to form a retaining ring, and finally the processing of the groove and the retaining ring of the fastener is completed. Since there is a preliminary groove in the blanking stage, at this time, the pushing resistance is smaller. By designing the protruding distance of the pushing protrusion, the outer diameter of the retaining ring formed at the pushing protrusion can be made larger than that of the retaining ring formed by the blanking protrusion. At this time, after processing, the groove depth is also larger; because of forming by forging, the process is simple, the material utilization rate is high, and the production efficiency is high. And through the combined forming process of blanking and pushing, the forging force is balanced, and the die life is high; and the outer diameter size of the retaining ring is stable, the cooperation with the sheet metal hole of the mating part is good, and better riveting performance (greater pull-off force) can be provided. The outer diameter size and riveting performance of the retaining ring are taken into account, and the production speed is greatly improved.

[0022] 2. In the second scheme and its preferred embodiment, the material-binding protrusion is provided with a first side wall, a first vertical surface and a second side wall connected in sequence along the first direction, the first vertical surface is located in the second direction of the first side wall and the second side wall, the first side wall and the second side wall are inclined surfaces, the first side wall gradually approaches the first vertical surface along the first direction, and the second side wall gradually moves away from the first vertical surface along the first direction; wherein, the first side wall is used for material feeding transition, so that the light nail can be gradually and continuously extruded, the first vertical surface is used for forming, so that the depth of the "preparatory groove" reaches the initial requirement, and the second side wall is used for material discharging transition, which can release the rolling pressure. When in use, after the first mold and the second mold bite and press the light nail (to prevent slipping), the light nail begins to contact the first side wall, the cutting edge of the first side wall rolls into the light nail, and the extruded material flows downward and discharges to form a groove and a clamping ring. As the rolling process proceeds, the rolling depth and width gradually increase, and the groove depth and the outer diameter of the clamping ring gradually increase until the first vertical surface ends.

[0023] 3. In scheme three and its preferred embodiment, the material-binding portion is also provided with a second vertical surface and a first surface, the material-binding protrusion protrudes along the second direction relative to the second vertical surface, the top end of the second vertical surface is connected to the lower surface of the material-binding protrusion, and the bottom end of the second vertical surface is connected to the first surface, wherein the second vertical surface is used for the preliminary shaping of the outer peripheral wall of the clamping ring, and the first surface is used for the preliminary shaping of the lower surface of the clamping ring, so as to make subsequent pushing of the material easier.

[0024] 4. In scheme 4 and its preferred embodiment, the top surface of the material-binding protrusion is a plane, so that the head support area of ​​the bare nail is larger and processing is convenient.

[0025] 5. In scheme five and its preferred embodiment, the pushing portion is also provided with a third vertical surface, the pushing protrusion protrudes along the second direction relative to the third vertical surface, and the upper surface of the pushing protrusion is also provided with a second inclined surface, the second inclined surface is connected to the third vertical surface, and protrudes along the second direction and tilts downward, and the second inclined surface is located in the first direction of the first inclined surface.

[0026] During processing, the third vertical surface is close to the outer peripheral wall of the collar, restricting the free flow of materials and shaping and correcting the collar to further ensure the stability of the outer diameter of the collar and its compatibility with the sheet metal hole of the counterpart. At the same time, the outer diameter of the collar can be adjusted according to the position of the third vertical surface relative to the pusher protrusion; and the second inclined surface further shapes the lower surface of the collar to make the collar shape better. The third vertical surface is located on the side of the second vertical surface away from the second mold, so that the outer diameter of the collar formed at the pusher protrusion can be larger than that of the collar formed by the binder protrusion.

[0027] 6. In scheme six and its preferred embodiment, the surface of the pushing protrusion away from the third vertical surface is the fourth vertical surface, and the top of the fourth vertical surface is connected to the first inclined surface and the second inclined surface, so as to push the light nail through the plane to make the shape of the light nail under the clamping ring better.

[0028] 7. In Scheme 7 and its preferred embodiment, the first mold is also provided with a first tooth pattern, and the first tooth pattern is located below the tying part and the pushing part. The second mold is provided with a second tooth pattern matched with the first tooth pattern, so that the one-piece forming of the thread can be realized, which is more convenient and improves efficiency. It is realized by the rolling process, and the material utilization rate is high.

[0029] 8. In scheme eight and its preferred embodiments, the second mold is provided with a matching portion corresponding to the binding portion and the pushing portion, and the matching portion is provided with a matching protrusion protruding in the opposite direction of the second direction, and the upper surface of the matching protrusion is provided with a fourth inclined surface and a third inclined surface arranged along the first direction, and the fourth inclined surface protrudes in the opposite direction of the second direction and tilts downward to assist in the molding of the lower surface of the clamping ring; the third inclined surface gradually tilts downward along the first direction to realize material feeding guidance and assist in the molding of the lower surface of the clamping ring.

[0030] 9. In scheme nine and its preferred embodiment, the mating portion is also provided with a fifth vertical surface, the mating protrusion protrudes in the opposite direction of the second direction relative to the fifth vertical surface, one end of the fourth inclined surface and the third inclined surface are connected to the fifth vertical surface, and the fifth vertical surface assists in the forming of the outer peripheral wall of the clamping ring.

[0031] 10. In scheme 10 and its preferred embodiment, the mating protrusion is also provided with a sixth vertical surface, and the end of the fourth inclined surface and the third inclined surface facing away from the fifth vertical surface is connected to the sixth vertical surface, so as to push the optical pin through the plane to make the optical pin under the clamping ring have a better appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 is a three-dimensional diagram of the fastener in the first embodiment;

[0034] Figure 2 is a three-dimensional diagram of the rolling mold in Example 1;

[0035] Figure 3 is a three-dimensional diagram of the first mold in Example 1;

[0036] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0037] Figure 5 for Figure 3 The enlarged view of point B in the middle;

[0038] Figure 6It is the left view of the first mold in Embodiment 1, that is, the view on the side close to the material piercing part;

[0039] Figure 7 It is Figure 6 the enlarged view of the position C in

[0040] Figure 8 It is the right view of the first mold in Embodiment 1, that is, the view on the side close to the material pushing part;

[0041] Figure 9 It is Figure 8 the enlarged view of the position D in

[0042] Figure 10 It is the top view of the first mold in Embodiment 1;

[0043] Figure 11 It is Figure 10 the enlarged view of the position E in

[0044] Figure 12 It is the perspective view of the second mold in Embodiment 1;

[0045] Figure 13 It is Figure 12 the enlarged view of the position F in

[0046] Figure 14 It is Figure 12 the enlarged view of the position G in

[0047] Figure 15 It is the left view of the second mold in Embodiment 1, that is, the view on the side close to the fourth inclined surface;

[0048] Figure 16 It is the right view of the second mold in Embodiment 1, that is, the view on the side close to the third inclined surface;

[0049] Main reference numeral description:

[0050] The first mold 10; the material piercing part 1; the first surface 11; the second vertical surface 12; the material piercing protrusion 13; the first side wall 131; the first vertical surface 32; the second side wall 133; the material pushing part 2; the third vertical surface 21; the material pushing protrusion 22; the first inclined surface 221; the second inclined surface 222; the fourth vertical surface 223; the seventh vertical surface 23; the first thread 3; the second mold 20; the fifth vertical surface 4; the mating protrusion 5; the fourth inclined surface 51; the third inclined surface 52; the sixth vertical surface 53; the second thread 6; the first direction 7; the second direction 8; the head 91; the thread 92; the serrated teeth 93; the snap ring 94; the groove 95; Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0052] In the claims, the specification and the above-mentioned drawings of the present invention, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., are used to distinguish different objects and not for describing a specific order.

[0053] In the claims, the specification and the above-mentioned drawings of the present invention, unless otherwise clearly defined, for orientation terms, when using terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate the orientation or positional relationship, it is based on the orientation and positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the specific protection scope of the present invention.

[0054] In the claims, the specification and the above-mentioned drawings of the present invention, unless otherwise clearly defined, when using the terms "fixed connection" or "fixedly connected", should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, being integrally connected, and being fixed by other devices or elements.

[0055] In the claims, the specification and the above-mentioned drawings of the present invention, when using terms such as "comprising", "having" and their variants, are intended to mean "including but not limited to".

[0056] Reference Figures 2 - 16 , a forging die, comprising a first die 10 and a second die 20.

[0057] Reference Figures 2 - 11 , the top of the first die 10 includes a material pressing part 1 and a material pushing part 2 arranged along the first direction 7. In this embodiment, when processing fasteners, the first die 10 remains stationary and the second die 20 moves, and the first direction 7 is the movement direction of the second die 20 during processing.

[0058] Reference Figure 4The material-binding portion 1 is provided with a first surface 11, a second vertical surface 12 and a material-binding protrusion 13. The material-binding protrusion 13 protrudes along the second direction 8 relative to the second vertical surface 12. The second direction 8 is perpendicular to the first direction 7 and is the direction of the first mold 10 toward the second mold 20. In the following, the right is the direction indicated by the second direction 8. The first surface 11 is a plane in this embodiment. Figure 4 , Figure 7 The lower surface of the material-binding protrusion 13 protrudes along the second direction 8 and tilts upward, so that the lower surface of the material-binding protrusion 13 is oriented to the lower right. The material-binding protrusion 13 is provided with a first side wall 131, a first vertical surface 32, and a second side wall 133 that are sequentially connected along the first direction 7, and the first side wall 131 and the second side wall 133 are parallel to the vertical direction. Figure 7 , Figure 9 , the first vertical surface 32 is located in the second direction 8 between the first side wall 131 and the second side wall 133. Figure 4 , Figure 7 , Figure 9 The first side wall 131 and the second side wall 133 are inclined surfaces, the first side wall 131 gradually approaches the first vertical surface 32 along the first direction 7, and the second side wall 133 gradually moves away from the first vertical surface 32 along the first direction 7, so that the material binding protrusion 13 is roughly a trapezoidal cube. Figure 7 , Figure 9 The top surface of the material-binding protrusion 13 is a plane and is flush with the upper end surface of the first mold 10. Figure 4 The top of the second vertical surface 12 is connected to the lower surface of the material-binding protrusion 13, and the bottom of the second vertical surface 12 is connected to the first surface 11, and the first surface 11 is parallel to the horizontal plane. In order to make the material-binding part 1 have a better binding effect or better strength, the material-binding part 1 can be made of a higher strength material and connected with other parts (such as welding or gluing) to form the first mold 10.

[0059] refer to Figure 5 , Figure 9 , Figure 11, the material pushing part 2 is provided with a third vertical surface 21 and a material pushing protrusion 22, and the material pushing protrusion 22 protrudes along the second direction 8 relative to the third vertical surface 21. The top end of the third vertical surface 21 is connected to the top surface of the first mold 10, and the third vertical surface 21 is located on the side of the second vertical surface 12 away from the second mold 20. The upper surface of the material pushing protrusion 22 is provided with a first inclined surface 221 that slopes upward along the first direction 7 (that is, the first inclined surface 221 gradually approaches the upper end surface of the first mold 10 along the first direction 7), and the starting end of the first inclined surface 221 is located below the lower surface of the material binding protrusion 13. The upper surface of the material pushing protrusion 22 is also provided with a second inclined surface 222, the second inclined surface 222 is connected to the third vertical surface 21, and protrudes and slopes downward along the second direction 8, so that the orientation of the second inclined surface 222 is upper right, and the second inclined surface 222 is located in the first direction 7 of the first inclined surface 221. The surface of the material pushing protrusion 22 facing away from the third vertical surface 21 is a fourth vertical surface 223, and the top of the fourth vertical surface 223 is connected to the first inclined surface 221 and the second inclined surface 222. The lower surface of the material pushing protrusion 22 can form a thread 92 and is connected to the lower end of the fourth vertical surface 223. The material pushing protrusion 22 is also provided with a seventh vertical surface 23, the seventh vertical surface 23 is located between the third vertical surface 21 and the second vertical surface 12, the top end of the seventh vertical surface 23 is connected to the second inclined surface 222, and the bottom end is connected to the first inclined surface 221 to gradually increase the outer diameter of the retaining ring 94 and reduce the force required for rolling.

[0060] Reference Figure 4 , the first mold 10 is also provided with a first thread 3, the first thread 3 is located below the material binding part 1 and the material pushing part 2, and the first thread 3 gradually slopes downward along the first direction 7.

[0061] Reference Figures 12 - 16 , the second mold 20 is adapted to move relative to the first mold 10 along the first direction 7 and cooperate with the material binding part 1 and the material pushing part 2 to form a groove 95 and a retaining ring 94 of the fastener. Specifically, the second mold 20 is provided with a mating part corresponding to the material binding part 1 and the material pushing part 2, the mating part is provided with a fifth vertical surface 4 and a mating protrusion 5, and the top end of the fifth vertical surface 4 is connected to the top surface of the second mold 20. The mating protrusion 5 protrudes along the opposite direction of the second direction 8 relative to the fifth vertical surface 4, and the upper surface of the mating protrusion 5 is provided with a fourth inclined surface 51 and a third inclined surface 52 arranged along the first direction 7, and one ends of the fourth inclined surface 51 and the third inclined surface 52 are connected to the fifth vertical surface 4. The fourth inclined surface 51 protrudes and slopes downward along the opposite direction of the second direction 8, so that the orientation of the fourth inclined surface 51 is upper left; the third inclined surface 52 gradually slopes downward along the first direction 7, that is, the third inclined surface 52 gradually moves away from the upper end surface of the second mold 20 along the first direction 7. The mating protrusion 5 is also provided with a sixth vertical surface 53, and one ends of the fourth inclined surface 51 and the third inclined surface 52 facing away from the fifth vertical surface 4 are connected to the top end of the sixth vertical surface 53. The bottom surface of the mating protrusion 5 can be used to form a thread 92 and is connected to the bottom end of the sixth vertical surface 53.

[0062] Reference Figure 13 Figure 13 , the second die 20 is provided with a second thread 6 adapted to the first thread 3. The second thread 6 is located below the mating portion, and the second thread 6 gradually slopes upward along the first direction 7. In the above, each "vertical plane" is parallel to each other and perpendicular to the second direction 8, while the "horizontal plane" is parallel to the first direction 7 and the second direction 8. The vertical direction is perpendicular to the horizontal plane and parallel to the vertical plane.

[0063] The forging process is as follows:

[0064] Thread 92 forging process: The head 91 or the serration 93 of the smooth nail is located on the upper surfaces of the first die 10 and the second die 20. After the first die 10 and the second die 20 bite and press the smooth nail (to prevent slipping), the second die 20 moves relative to the first die 10 along the first direction 7. The second thread 6 and the first thread 3 squeeze the smooth nail to make it rotate, so that threads 92 are formed on its surface within the thread die. During the forging (thread rolling) process, under the squeezing action of the second thread 6 and the first thread 3, the smooth nail flows and extends and deforms (gradually bulges toward the side of the thread 92) into the gap on the side of the thread 92 until the major diameter of the thread 92 reaches the required size, forming the thread 92 elements.

[0065] Circlip 94 and groove 95 forging process: During the above forging, the smooth nail begins to contact the first side wall 131. The edge of the first side wall 131 is rolled into the smooth nail, squeezing the material to flow downward and discharge, forming the groove 95 and the circlip 94. As the forging process progresses, the rolling-in depth and width gradually increase, and the depth of the groove 95 and the outer diameter of the circlip 94 gradually become larger until the first vertical plane 32 ends, initially forming a wide and shallow "preliminary groove 95". The lower surface of the material rolling protrusion 13 can form the upper surface of the circlip 94 of the fastener; the material pushing protrusion 22 is connected after the material rolling protrusion 13. At this time, the smooth nail contacts the material pushing protrusion 22. Under the action of the squeezing force, the smooth nail is gradually pushed and lifted along the first inclined surface 221 on the material pushing protrusion 22 to form the circlip 94, and is shaped by the second inclined surface 222 and the third vertical plane 21. Finally, the processing of the groove 95 and the circlip 94 of the fastener is completed. Since there is a preliminary groove 95 in the material rolling stage, the material pushing resistance is smaller during the working process of the material pushing part. By designing the protruding distance of the material pushing protrusion 22, the outer diameter of the circlip 94 formed at the material pushing protrusion 22 can be made larger than the outer diameter of the circlip 94 formed by the material rolling protrusion 13. At this time, after processing, the depth of the groove 95 is also larger;

[0066] Compared with the prior art, the present embodiment has the following beneficial effects:

[0067] In an exemplary embodiment, a forging die includes a first die 10 and a second die 20.

[0068] The top of the first die 10 includes a blank holding portion 1 and a material pushing portion 2 arranged along the first direction 7. The blank holding portion 1 is provided with a blank holding protrusion 13 protruding along the second direction 8 perpendicular to the first direction 7. The lower surface of the blank holding protrusion 13 protrudes along the second direction 8 and slopes upward. The material pushing portion 2 is provided with a material pushing protrusion 22 protruding along the second direction 8. The upper surface of the material pushing protrusion 22 is provided with a first inclined surface 221 sloping upward along the first direction 7. The starting end of the first inclined surface 221 is located below the lower surface of the blank holding protrusion 13;

[0069] The second die 20 is adapted to move relative to the first die 10 along the first direction 7 and cooperate with the blank holding portion 1 and the material pushing portion 2 to form a groove 95 and a snap ring 94 of the fastener. Specifically, when the second die 20 moves relative to the first die 10 along the first direction 7, the smooth nail rolls to start forging. During the forging process, the blank holding protrusion 13 extrudes the smooth nail to initially form a "preliminary groove 95", and the lower surface of the blank holding protrusion 13 can form the upper surface of the snap ring 94 of the fastener; the material pushing protrusion 22 is connected after the blank holding protrusion 13. At this time, the smooth nail contacts the material pushing protrusion 22. Under the action of the extrusion force, the smooth nail is gradually pushed and lifted along the first inclined surface 221 on the material pushing protrusion 22 to form the snap ring 94, and finally the processing of the groove 95 and the snap ring 94 of the fastener is completed. Since there is a preliminary groove 95 in the blanking stage, at this time, the pushing resistance is smaller. By designing the protruding distance of the material pushing protrusion 22, the outer diameter of the snap ring 94 formed at the material pushing protrusion 22 can be made larger than the outer diameter of the snap ring 94 formed by the blank holding protrusion 13. At this time, after processing, the depth of the groove 95 is also larger; due to forming by forging, the process is simple, the material utilization rate is high, and the production efficiency is high. And through the blanking and material pushing composite forming process, the forging force is balanced, and the die life is high; and the outer diameter size of the snap ring 94 is stable, the cooperation with the sheet metal hole of the mating part is good, and better riveting performance (greater pull-off force) can be provided. The outer diameter size and riveting performance of the snap ring 94 are taken into account, and the production speed is greatly increased.

[0070] In the prior art, there is also a process of forming the groove 95 by using a thread rolling die in one step. A blade is inlaid at the upper end of the first die 10. The blade has a cutting surface parallel to the moving direction of the second die 20. During the process of the bolt blank moving forward, although the blade moves horizontally together with the second die 20, the blade edge rolls into the smooth rod of the screw, and the material is extruded to flow downward and discharged to form the groove 95 and the snap ring 94. In order to ensure the tensile strength of the screw after riveting, the groove 95 needs to have sufficient width and depth. Since the blade is thin, the greater the interference amount of the blade rolling into the smooth rod of the screw, the greater the force. The blade is thin and easy to crack, and the die life is poor. In this solution, due to the blanking and material pushing composite forming process, the forging force is balanced, and the die life is high.

[0071] In an exemplary embodiment, the material piercing protrusion 13 is provided with a first side wall 131, a first vertical surface 32, and a second side wall 133 that are sequentially connected along the first direction 7. The first vertical surface 32 is located in the second direction 8 between the first side wall 131 and the second side wall 133. The first side wall 131 and the second side wall 133 are inclined surfaces. The first side wall 131 gradually approaches the first vertical surface 32 along the first direction 7, and the second side wall 133 gradually moves away from the first vertical surface 32 along the first direction 7. Among them, the first side wall 131 is used for feeding transition, so that the optical nails can be gradually and continuously extruded. The first vertical surface 32 is used for forming, so that the depth of the "preliminary groove 95" reaches the preliminary requirement. The second side wall 133 is used for discharging transition and can release the rolling pressure. During use, when the first mold 10 and the second mold 20 bite and clamp the optical nails (to prevent slipping), the optical nails start to contact the first side wall 131. The edge of the first side wall 131 is rolled into the optical nails, and the extruded material flows downward and is discharged, forming a groove 95 and a retaining ring 94. As the rolling process progresses, the rolling-in depth and width gradually increase, and the depth of the groove 95 and the outer diameter of the retaining ring 94 gradually become larger until the first vertical surface 32 ends.

[0072] In an exemplary embodiment, the material piercing portion 1 is further provided with a second vertical surface 12 and a first surface 11. The material piercing protrusion 13 protrudes relative to the second vertical surface 12 in the second direction 8. The top end of the second vertical surface 12 is connected to the lower surface of the material piercing protrusion 13, and the bottom end of the second vertical surface 12 is connected to the first surface 11. Among them, the second vertical surface 12 is used for the preliminary shaping of the outer peripheral wall of the retaining ring 94, and the first surface 11 is used for the preliminary shaping of the lower surface of the retaining ring 94 to make it easier to push the material in the subsequent process.

[0073] In an exemplary embodiment, the top surface of the material piercing protrusion 13 is a flat surface, so that the supporting area of the head 91 of the optical nail is larger, which is convenient for processing.

[0074] In an exemplary embodiment, the material pushing portion 2 is further provided with a third vertical surface 21. The material pushing protrusion 22 protrudes relative to the third vertical surface 21 in the second direction 8. The upper surface of the material pushing protrusion 22 is further provided with a second inclined surface 222. The second inclined surface 222 is connected to the third vertical surface 21, protrudes and slopes downward in the second direction 8, and the second inclined surface 222 is located in the first direction 7 of the first inclined surface 221.

[0075] During processing, the third vertical surface 21 is close to the outer peripheral wall of the collar 94, restricting the free flow of the material, and playing a role in shaping and correcting the collar 94, so as to further ensure the stability of the outer diameter of the collar 94 and the compatibility with the sheet metal hole of the counterpart. At the same time, according to the position of the third vertical surface 21 relative to the material pushing protrusion 22, the size of the outer diameter of the collar 94 can be adjusted; and the second inclined surface 222 further shapes the lower surface of the collar 94 to make the shape of the collar 94 better. The third vertical surface 21 is located on the side of the second vertical surface 12 away from the second mold 20, so that the outer diameter of the collar 94 formed at the material pushing protrusion 22 can be larger than that of the collar 94 formed by the material binding protrusion 13.

[0076] In an exemplary embodiment, the surface of the pushing protrusion 22 facing away from the third vertical surface 21 is a fourth vertical surface 223, and the top of the fourth vertical surface 223 is connected to the first inclined surface 221 and the second inclined surface 222, so as to push the light nail through the plane to make the shape of the light nail under the clamping ring 94 better.

[0077] In an exemplary embodiment, the first mold 10 is also provided with a first tooth pattern 3, and the first tooth pattern 3 is located below the tying part 1 and the pushing part 2. The second mold 20 is provided with a second tooth pattern 6 adapted to the first tooth pattern 3, so that the one-piece forming of the thread 92 can be achieved, which is more convenient and improves efficiency. It is achieved by the rolling process, and the material utilization rate is high.

[0078] In an exemplary embodiment, the second mold 20 is provided with a matching portion corresponding to the binding portion 1 and the pushing portion 2, and the matching portion is provided with a matching protrusion 5 protruding in the opposite direction of the second direction 8, and the upper surface of the matching protrusion 5 is provided with a fourth inclined surface 51 and a third inclined surface 52 arranged along the first direction 7, and the fourth inclined surface 51 protrudes in the opposite direction of the second direction 8 and tilts downward to assist in the molding of the lower surface of the clamping ring 94; the third inclined surface 52 gradually tilts downward along the first direction 7 to achieve material feeding guidance and assist in the molding of the lower surface of the clamping ring 94.

[0079] In an exemplary embodiment, the mating portion is also provided with a fifth vertical surface 4, the mating protrusion 5 protrudes in the opposite direction of the second direction 8 relative to the fifth vertical surface 4, one end of the fourth inclined surface 51 and the third inclined surface 52 are connected to the fifth vertical surface 4, and the fifth vertical surface 4 is used to assist in the forming of the outer peripheral wall of the retaining ring 94.

[0080] In an exemplary embodiment, the mating protrusion 5 is also provided with a sixth vertical surface 53, and the end of the fourth inclined surface 51 and the third inclined surface 52 facing away from the fifth vertical surface 4 is connected to the sixth vertical surface 53 to push the optical pin through the plane so that the optical pin under the clamping ring 94 has a better appearance.

[0081] The descriptions of the above-mentioned specification and embodiments are used to explain the scope of protection of the present invention, but do not constitute a limitation to the scope of protection of the present invention. Modifications, equivalent replacements or other improvements to the embodiments of the present invention or some of its technical features that can be obtained by those of ordinary skill in the art through logical analysis, reasoning or limited experiments in combination with common general knowledge, ordinary technical knowledge in the field and / or the prior art shall be included within the scope of protection of the present invention.

Claims

1. A forging die, characterized in that: including a first die (10), the top of which includes a material piercing part (1) and a material pushing part (2) arranged along a first direction (7), the material piercing part (1) is provided with a material piercing protrusion (13) protruding along a second direction (8) perpendicular to the first direction (7), the lower surface of the material piercing protrusion (13) protrudes along the second direction (8) and slopes upward; the material pushing part (2) is provided with a material pushing protrusion (22) protruding along the second direction (8), and the upper surface of the material pushing protrusion (22) is provided with a first inclined surface (221) sloping upward along the first direction (7), and the starting end of the first inclined surface (221) is located below the lower surface of the material piercing protrusion (13); a second die (20), which is adapted to move relative to the first die (10) along the first direction (7) and cooperate with the material piercing part (1) and the material pushing part (2) to form a groove (95) and a snap ring (94) of a fastener.

2. The rotary forging die according to claim 1, wherein: The material piercing protrusion (13) is provided with a first side wall (131), a first vertical surface (32) and a second side wall (133) connected in sequence along the first direction (7), the first vertical surface (32) is located in the second direction (8) of the first side wall (131) and the second side wall (133), the first side wall (131) and the second side wall (133) are inclined surfaces, the first side wall (131) gradually approaches the first vertical surface (32) along the first direction (7), and the second side wall (133) gradually moves away from the first vertical surface (32) along the first direction (7).

3. The rotary forging die according to claim 1, characterized in that: The material piercing part (1) is further provided with a second vertical surface (12) and a first surface (11), the material piercing protrusion (13) protrudes along the second direction (8) relative to the second vertical surface (12), the top end of the second vertical surface (12) is connected to the lower surface of the material piercing protrusion (13), and the bottom end of the second vertical surface (12) is connected to the first surface (11).

4. A forging die according to claim 1, characterized in that: The top surface of the material piercing protrusion (13) is a plane.

5. The rotary forging die according to claim 3, characterized in that: The material pushing part (2) is further provided with a third vertical surface (21), the material pushing protrusion (22) protrudes along the second direction (8) relative to the third vertical surface (21), the upper surface of the material pushing protrusion (22) is further provided with a second inclined surface (222), the second inclined surface (222) is connected to the third vertical surface (21), protrudes along the second direction (8) and slopes downward, and the second inclined surface (222) is located in the first direction (7) of the first inclined surface (221); the third vertical surface (21) is located on the side of the second vertical surface (12) away from the second die (20).

6. The rotary forging die according to claim 5, wherein: The surface of the material pushing protrusion (22) facing away from the third vertical surface (21) is a fourth vertical surface (223), and the top of the fourth vertical surface (223) is connected to the first inclined surface (221) and the second inclined surface (222).

7. A forging die according to claim 1, characterized in that: The first die (10) is further provided with a first thread (3), the first thread (3) is located below the material piercing part (1) and the material pushing part (2), and the second die (20) is provided with a second thread (6) adapted to the first thread (3).

8. A forging die according to claim 1, characterized in that: The second mold (20) is provided with a mating portion corresponding to the material pressing portion (1) and the material pushing portion (2). The mating portion is provided with a mating protrusion (5) protruding in the opposite direction of the second direction (8). The upper surface of the mating protrusion (5) is provided with a fourth inclined surface (51) and a third inclined surface (52) arranged along the first direction (7). The fourth inclined surface (51) protrudes in the opposite direction of the second direction (8) and inclines downward; the third inclined surface (52) gradually inclines downward along the first direction (7).

9. A forging die according to claim 8, characterized in that: The mating portion is further provided with a fifth vertical surface (4). The mating protrusion (5) protrudes in the opposite direction of the second direction (8) relative to the fifth vertical surface (4). One end of the fourth inclined surface (51) and the third inclined surface (52) is connected to the fifth vertical surface (4).

10. A forging die according to claim 9, characterized in that: The mating protrusion (5) is further provided with a sixth vertical surface (53). One end of the fourth inclined surface (51) and the third inclined surface (52) away from the fifth vertical surface (4) is connected to the sixth vertical surface (53).

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