Rolling die

Abstract

The utility model 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] This utility model relates to the field of fastener processing, specifically to a rolling die. Background Technology

[0002] Fasteners are a widely used type of mechanical part used for fastening connections. With the development of the automotive industry and technological advancements, fastening technology has also developed rapidly, leading to the widespread adoption and application of riveted fasteners. In particular, such as... Figure 1 The rivet bolt with retaining ring shown consists of a head 91, a thread 92, a toothed 93, a retaining ring 94, and a groove 95. The toothed 93 is located on the lower surface of the head 91, and the retaining ring is located between the threaded rod and the head. The retaining ring and the lower surface of the head together form the groove 95.

[0003] The traditional forming process for the groove and retaining ring of this rivet bolt is cold heading to form a blank bolt + machining the groove + thread rolling. That is, after cold heading out the blank, the groove shape is machined, and finally the thread is rolled. The above process has low processing efficiency, low material utilization, and is difficult to mass produce on a large scale. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned defects or problems existing in the background art or to provide a material basis for overcoming the above-mentioned defects or problems existing in the background art, and to provide a rolling die.

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

[0006] Option 1, a rolling die, including

[0007] The first mold has a top portion including a binding part and a pushing part arranged along a first direction. The binding part has a binding protrusion protruding along a second direction perpendicular to the first direction. The lower surface of the binding protrusion protrudes along the second direction and is inclined upward. The pushing part has a pushing protrusion protruding along the second direction. The upper surface of the pushing protrusion has a first inclined surface inclined upward along the first direction. The starting end of the first inclined surface is located below the lower surface of the binding protrusion.

[0008] The second mold is adapted to move relative to the first mold in a first direction and cooperate with the binding part and the pushing part to form the groove and retaining ring of the fastener.

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

[0010] Option 3, based on Option 1, further includes a second vertical surface and a first surface for the binding part. The binding protrusion protrudes from the second vertical surface along a second direction. The top of the second vertical surface is connected to the lower surface of the binding protrusion, and the bottom of the second vertical surface is connected to the first surface.

[0011] Option 4, based on Option 1, has a flat top surface for the raised material.

[0012] Option 5, based on Option 3, further includes a third vertical surface for the pusher section. The pusher protrusion protrudes along a second direction relative to the third vertical surface. The upper surface of the pusher 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 while tilting 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] Option 6, based on Option 5, the surface of the pusher protrusion facing 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.

[0014] Option 7, based on Option 1, the first mold is further provided with a first tooth pattern, the first tooth pattern being located below the material-binding part and the material-pushing part, and the second mold is provided with a second tooth pattern that matches the first tooth pattern.

[0015] Option 8, based on Option 1, the second mold is provided with a mating part corresponding to the material-binding part and the material-pushing part. The mating part is provided with a mating protrusion protruding in the opposite direction of the second direction. The upper surface of the mating protrusion is provided with a fourth inclined surface and a third inclined surface arranged in the first direction. The fourth inclined surface protrudes in the opposite direction of the second direction and slopes downward. The third inclined surface gradually slopes downward in the first direction.

[0016] Option 9, based on Option 8, further includes a fifth vertical surface for the mating part, and the mating protrusion protrudes in the opposite direction to the fifth vertical surface along the second direction. One end of the fourth inclined surface and the third inclined surface are connected to the fifth vertical surface.

[0017] Option 10, based on Option 9, further includes a sixth vertical surface for the mating protrusion, and the ends of the fourth and third inclined surfaces that are away from the fifth vertical surface are connected to the sixth vertical surface.

[0018] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0019] 1. In Scheme 1 and its preferred embodiments, a rolling die includes a first die and a second die.

[0020] The top of the first mold includes a binding section and a pushing section arranged along a first direction. The binding section has a binding protrusion protruding along a second direction perpendicular to the first direction, and the lower surface of the binding protrusion protrudes along the second direction and slopes upward. The pushing section has a pushing protrusion protruding along the second direction, and the upper surface of the pushing protrusion has a first inclined surface that slopes upward along the first direction, with the starting end of the first inclined surface located below the lower surface of the binding protrusion.

[0021] The second mold is adapted to move relative to the first mold along a first direction and cooperate with the binding part and the pushing part to form the groove and retaining ring of the fastener. Specifically, when the second mold moves relative to the first mold along the first direction, the light nail rolls to start rolling. During the rolling process, the binding protrusion squeezes the light nail, which can initially form a "prepared groove" on the light nail, and the lower surface of the binding protrusion can form the upper surface of the retaining ring of the fastener. The pushing protrusion is connected after the binding protrusion. At this time, the light nail contacts the pushing protrusion. Under the action of the extrusion force, the light 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 retaining ring of the fastener is completed. Since there is a prepared groove in the rolling stage, the pushing resistance is smaller at this time. By designing the protrusion distance of the pushing protrusion, the outer diameter of the retaining ring formed at the pushing protrusion can be larger than that of the retaining ring formed by the binding protrusion. At this time, the groove depth is also larger after processing. Since it is formed by rolling, the process is simple, the material utilization rate is high, and the production efficiency is high. Furthermore, through the combined rolling and pushing forming process, the rolling force is balanced and the mold life is long; the outer diameter of the retaining ring is stable, it has good fit with the sheet metal holes of the hand parts, and can provide better riveting performance (greater pull-out force). The outer diameter of the retaining ring and riveting performance are taken into account, and the production speed is greatly improved.

[0022] 2. In Scheme 2 and its preferred embodiments, the material-binding protrusion is provided with a first sidewall, a first vertical surface, and a second sidewall connected sequentially along a first direction. The first vertical surface is located in a second direction of the first and second sidewalls. The first and second sidewalls are inclined surfaces. The first sidewall gradually approaches the first vertical surface along the first direction, and the second sidewall gradually moves away from the first vertical surface along the first direction. The first sidewall is used for material feeding transition, allowing the optical nail to be gradually and continuously squeezed. The first vertical surface is used for shaping, ensuring the "prepared groove" depth reaches the initial requirement. The second sidewall is used for material discharge transition, releasing the rolling pressure. In use, after the first and second molds clamp the optical nail together (to prevent slippage), the optical nail begins to contact the first sidewall. The cutting edge of the first sidewall rolls into the optical nail, squeezing the material downwards and forming a groove and a retaining ring. As the rolling process progresses, the rolling depth and width gradually increase, and the groove depth and retaining ring outer diameter gradually increase until the first vertical surface ends.

[0023] 3. In Scheme 3 and its preferred embodiments, the binding part is further provided with a second vertical surface and a first surface. The binding protrusion protrudes in a second direction relative to the second vertical surface. The top of the second vertical surface is connected to the lower surface of the binding protrusion, and the bottom of the second vertical surface is connected to the first surface. The second vertical surface is used for the preliminary shaping of the outer peripheral wall of the retaining ring, while the first surface is used for the preliminary shaping of the lower surface of the retaining ring, making it easier to push the material later.

[0024] 4. In Scheme 4 and its preferred embodiments, the top surface of the tufting protrusion is flat, which makes the head support area of ​​the optical nail larger and facilitates processing.

[0025] 5. In Scheme 5 and its preferred embodiments, the pushing part is further provided with a third vertical surface, the pushing protrusion protrudes in the second direction relative to the third vertical surface, the upper surface of the pushing protrusion is further provided with a second inclined surface, the second inclined surface is connected to the third vertical surface, and protrudes in the second direction and tilts downward, the second inclined surface is located in the first direction of the first inclined surface.

[0026] During processing, the third vertical surface is in close contact with the outer peripheral wall of the retaining ring, restricting the free flow of material and playing a shaping and correcting role for the retaining ring. This further ensures the stability of the retaining ring's outer diameter and its fit with the sheet metal holes of the handpiece. Simultaneously, the size of the retaining ring's outer diameter can be adjusted according to the position of the third vertical surface relative to the push-out protrusion. Meanwhile, the second inclined surface further shapes the lower surface of the retaining ring, resulting in a better shape. The third vertical surface is located on the side of the second vertical surface away from the second mold, allowing the retaining ring formed at the push-out protrusion to have a larger outer diameter than the retaining ring formed at the tie-out protrusion.

[0027] 6. In Scheme 6 and its preferred embodiments, the surface of the pusher protrusion facing away from the third vertical surface is the fourth vertical surface. The top of the fourth vertical surface is connected to the first inclined surface and the second inclined surface, so as to push the optical nail through the plane and make the shape of the optical nail under the retaining ring better.

[0028] 7. In Scheme 7 and its preferred embodiments, the first mold is further provided with a first thread, which is located below the material rolling part and the material pushing part. The second mold is provided with a second thread that matches the first thread, thereby realizing the integral forming of the thread, which is more convenient and improves efficiency. Moreover, it is achieved by rolling process, resulting in high material utilization.

[0029] 8. In Scheme 8 and its preferred embodiments, the second mold is provided with a mating part corresponding to the material feeding part and the material pushing part. The mating part is provided with a mating protrusion protruding in the opposite direction of the second direction. The upper surface of the mating protrusion is provided with a fourth inclined surface and a third inclined surface arranged in the first direction. The fourth inclined surface protrudes in the opposite direction of the second direction and slopes downward to assist in the forming of the lower surface of the retaining ring. The third inclined surface gradually slopes downward in the first direction to realize material feeding guidance and assist in the forming of the lower surface of the retaining ring.

[0030] 9. In Scheme 9 and its preferred embodiments, the mating part is further provided with a fifth vertical surface, and the mating protrusion protrudes in the opposite direction to 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 retaining ring.

[0031] 10. In Scheme 10 and its preferred embodiment, a sixth vertical surface is also provided in conjunction with the protrusion. The end of the fourth inclined surface and the third inclined surface opposite to the fifth vertical surface is connected to the sixth vertical surface, so as to push the light nail through the plane and make the shape of the light nail under the ring better. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a perspective view of the fastener in Example 1;

[0034] Figure 2 This is a perspective view of the rolling die in Example 1;

[0035] Figure 3 This is a perspective view of the first mold in Example 1;

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

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

[0038] Figure 6This is a left view of the first mold in Embodiment 1, that is, the view near the material-binding part;

[0039] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0040] Figure 8 This is a right view of the first mold in Embodiment 1, that is, the view near the pusher section;

[0041] Figure 9 for Figure 8 Enlarged view at point D;

[0042] Figure 10 This is a top view of the first mold in Example 1;

[0043] Figure 11 for Figure 10 Enlarged view at point E in the middle;

[0044] Figure 12 This is a perspective view of the second mold in Example 1;

[0045] Figure 13 for Figure 12 Enlarged view at point F;

[0046] Figure 14 for Figure 12 Enlarged view of point G in the middle;

[0047] Figure 15 This is a left view of the second mold in Embodiment 1, specifically the view closer to the fourth inclined surface;

[0048] Figure 16 This is a right view of the second mold in Embodiment 1, specifically the view closer to the third inclined surface;

[0049] Explanation of key figure labels:

[0050] First mold 10; Material-binding part 1; First surface 11; Second vertical surface 12; Material-binding protrusion 13; First side wall 131; First vertical surface 32; Second side wall 133; Material-pushing part 2; Third vertical surface 21; Material-pushing protrusion 22; First inclined surface 221; Second inclined surface 222; Fourth vertical surface 223; Seventh vertical surface 23; First thread 3; Second mold 20; Fifth vertical surface 4; Mating protrusion 5; Fourth inclined surface 51; Third inclined surface 52; Sixth vertical surface 53; Second thread 6; First direction 7; Second direction 8; Head 91; Thread 92; Sprout 93; Snap ring 94; Groove 95; Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0052] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0053] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0054] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0055] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0056] refer to Figures 2-16 A rolling die, comprising a first die 10 and a second die 20.

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

[0058] refer to Figure 4The binding section 1 has a first surface 11, a second vertical surface 12, and a binding protrusion 13. The binding protrusion 13 protrudes relative to the second vertical surface 12 along a second direction 8. The second direction 8 is perpendicular to the first direction 7 and is the direction from the first mold 10 toward the second mold 20. Hereinafter, "right" refers to the direction indicated by the second direction 8. In this embodiment, the first surface 11 is a plane. (See reference...) Figure 4 , Figure 7 The lower surface of the binding protrusion 13 protrudes along the second direction 8 and slopes upward, such that the lower surface of the binding protrusion 13 faces downward to the right. The binding protrusion 13 has a first sidewall 131, a first vertical surface 32, and a second sidewall 133 connected sequentially along the first direction 7. The first sidewall 131 and the second sidewall 133 are parallel to the vertical direction. (Reference) Figure 7 , Figure 9 The first vertical surface 32 is located on the second direction 8 of the first sidewall 131 and the second sidewall 133. (See reference) Figure 4 , Figure 7 , Figure 9 The first sidewall 131 and the second sidewall 133 are inclined surfaces. The first sidewall 131 gradually approaches the first vertical surface 32 along the first direction 7, and the second sidewall 133 gradually moves away from the first vertical surface 32 along the first direction 7, making the tie-up protrusion 13 approximately trapezoidal cube-shaped. (Reference) Figure 7 , Figure 9 The top surface of the material-bearing protrusion 13 is flat and flush with the upper surface of the first mold 10. (Reference) Figure 4 The top of the second vertical surface 12 is connected to the lower surface of the binding protrusion 13, and the bottom of the second vertical surface 12 is connected to the first surface 11, which is parallel to the horizontal plane. In order to make the binding effect of the binding part 1 better or have better strength, the binding part 1 can be made of a higher strength material and formed into the first mold 10 by connecting it with other parts (such as welding or gluing).

[0059] refer to Figure 5 , Figure 9 , Figure 11The pusher section 2 has a third vertical surface 21 and a pusher protrusion 22, which protrudes from the third vertical surface 21 along the second direction 8. The top 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 pusher protrusion 22 has a first inclined surface 221 that slopes upward along the first direction 7 (i.e., 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 pusher protrusion 13. The upper surface of the pusher protrusion 22 also has a second inclined surface 222, which 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 on the first direction 7 of the first inclined surface 221. The surface of the pusher protrusion 22 facing away from the third vertical surface 21 is the fourth vertical surface 223. 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 pusher protrusion 22 can form a thread 92 and is connected to the lower end of the fourth vertical surface 223. The pusher protrusion 22 is also provided with a seventh vertical surface 23, which is located between the third vertical surface 21 and the second vertical surface 12. The top 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, so as to gradually increase the outer diameter of the retaining ring 94 and reduce the rolling force required.

[0060] refer to Figure 4 The first mold 10 is also provided with a first tooth pattern 3, which is located below the material-binding part 1 and the material-pushing part 2. The first tooth pattern 3 gradually slopes downward along the first direction 7.

[0061] refer to 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 binding part 1 and the pushing part 2 to form the groove 95 and retaining ring 94 of the fastener. Specifically, the second mold 20 is provided with a mating part corresponding to the binding part 1 and the pushing part 2. The mating part is provided with a fifth vertical surface 4 and a mating protrusion 5. 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 in the opposite direction to the fifth vertical surface 4 along 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. One end of the fourth inclined surface 51 and the third inclined surface 52 is connected to the fifth vertical surface 4. The fourth inclined surface 51 protrudes in the opposite direction to the second direction 8 and slopes downward, 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 protrusion 5 also has a sixth vertical surface 53, and the ends of the fourth inclined surface 51 and the third inclined surface 52 opposite to the fifth vertical surface 4 are connected to the top of the sixth vertical surface 53. The bottom surface of the protrusion 5 can be used to form the thread 92 and is connected to the bottom end of the sixth vertical surface 53.

[0062] refer to Figure 13 The second mold 20 is provided with a second thread 6 that matches the first thread 3. The second thread 6 is located below the mating part and gradually slopes upward along the first direction 7. The "vertical surfaces" mentioned above are parallel to each other and perpendicular to the second direction 8, while the "horizontal surfaces" are parallel to the first direction 7 and the second direction 8, the vertical direction is perpendicular to the horizontal surface and parallel to the vertical surfaces.

[0063] The rolling process is as follows:

[0064] The thread 92 rolling process: The head 91 or tooth 93 of the smooth nail is located on the upper surface of the first mold 10 and the second mold 20. After the first mold 10 and the second mold 20 clamp the smooth nail together (to prevent slippage), the second mold 20 moves relative to the first mold 10 in the first direction 7. The second tooth 6 and the first tooth 3 squeeze the smooth nail to make it rotate, so that its surface forms the thread 92 in the mold. During the rolling (thread rolling) process, under the squeezing force of the second tooth 6 and the first tooth 3, the smooth nail flows and extends and deforms towards the gap on the thread 92 side (gradually bulging towards the thread 92 side) until the major diameter of the thread 92 reaches the required size, forming the thread 92 element.

[0065] Rolling process of retaining ring 94 and groove 95: During the rolling process described above, the optical nail begins to contact the first sidewall 131. The cutting edge of the first sidewall 131 rolls into the optical nail, extruding the material downwards and forming groove 95 and retaining ring 94. As the rolling process progresses, the rolling depth and width gradually increase, and the depth of groove 95 and the outer diameter of retaining ring 94 gradually increase until the first vertical surface 32 ends, initially forming a wide and shallow "preparatory groove 95". The lower surface of the binding protrusion 13 can form the upper surface of the retaining ring 94 of the fastener. The pusher protrusion 22 connects to the binding protrusion 13. At this time, the optical nail and When the pusher protrusion 22 contacts, the optical nail is subjected to the squeezing force. The optical nail is gradually pushed and lifted along the first inclined surface 221 on the pusher protrusion 22 to form a retaining ring 94. It is then shaped by the second inclined surface 222 and the third vertical surface 21, and finally the processing of the groove 95 and retaining ring 94 of the fastener is completed. Since the groove 95 is prepared in the rolling stage, the pushing resistance is smaller during the operation of the pusher section. By designing the protrusion distance of the pusher protrusion 22, the outer diameter of the retaining ring 94 formed at the pusher protrusion 22 can be larger than that of the retaining ring 94 formed by the rolling protrusion 13. At this time, after processing, the groove 95 is also deeper.

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

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

[0068] The top of the first mold 10 includes a binding part 1 and a pushing part 2 arranged along a first direction 7. The binding part 1 has a binding protrusion 13 protruding along a second direction 8 perpendicular to the first direction 7. The lower surface of the binding protrusion 13 protrudes along the second direction 8 and is inclined upward. The pushing part 2 has a pushing protrusion 22 protruding along the second direction 8. The upper surface of the pushing protrusion 22 has a first inclined surface 221 that is inclined upward along the first direction 7. The starting end of the first inclined surface 221 is located below the lower surface of the binding protrusion 13.

[0069] The second mold 20 is adapted to move relative to the first mold 10 along the first direction 7, and cooperates with the binding part 1 and the pushing part 2 to form the groove 95 and retaining ring 94 of the fastener. Specifically, when the second mold 20 moves relative to the first mold 10 along the first direction 7, the optical nail rolls to start rolling. During the rolling process, the binding protrusion 13 squeezes the optical nail to initially form the "prepared groove 95", and the lower surface of the binding protrusion 13 can form the upper surface of the retaining ring 94 of the fastener. The pushing protrusion 22 is connected to the binding protrusion 13. At this time, the optical nail contacts the pushing protrusion 22. Under the pressure of extrusion, the fastener is gradually pushed and lifted along the first inclined surface 221 on the pusher protrusion 22 to form a retaining ring 94, thus completing the processing of the groove 95 and retaining ring 94 of the fastener. Since the groove 95 was prepared during the rolling stage, the pushing resistance is smaller at this time. By designing the protrusion distance of the pusher protrusion 22, the retaining ring 94 formed at the pusher protrusion 22 can have a larger outer diameter than the retaining ring 94 formed by the rolling protrusion 13. At this time, the groove 95 is also deeper after processing. Due to the rolling forming process, the process is simple, the material utilization rate is high, and the production efficiency is high. Moreover, through the combined rolling and pushing forming process, the rolling force is balanced, and the mold life is long. Furthermore, the outer diameter of the retaining ring 94 is stable, and it has good fit with the sheet metal hole of the hand part, providing better riveting performance (greater pull-out force). The outer diameter of the retaining ring 94 and the riveting performance are taken into account, and the production speed is greatly improved.

[0070] Existing technologies also employ a thread rolling die for one-time forming of the groove 95. A blade is embedded in the upper end of the first die 10, and this blade has a cutting surface parallel to the movement direction of the second die 20. During the bolt blank's movement, the blade moves along with the second die 20, and the blade edge rolls into the bolt shaft, forcing the material downwards to form the groove 95 and the retaining ring 94. To ensure the tensile strength of the bolt after riveting, the groove 95 needs sufficient width and depth. Because the blade is relatively thin, the greater the interference when the blade rolls into the bolt shaft, the greater the force. The thin blade is also prone to breakage, resulting in a short die life. This solution, through a combined rolling and pushing forming process, achieves balanced rolling force and a long die life.

[0071] In one exemplary embodiment, the material-binding protrusion 13 is provided with a first sidewall 131, a first vertical surface 32, and a second sidewall 133 connected sequentially along a first direction 7. The first vertical surface 32 is located on a second direction 8 of the first sidewall 131 and the second sidewall 133. The first sidewall 131 and the second sidewall 133 are inclined surfaces. The first sidewall 131 gradually approaches the first vertical surface 32 along the first direction 7, and the second sidewall 133 gradually moves away from the first vertical surface 32 along the first direction 7. The first sidewall 131 is used for material feeding transition, so that the light nail can be gradually and continuously squeezed; the first vertical surface 32 is used for shaping, so that the depth of the "prepared groove 95" reaches the initial requirement; and the second sidewall 133 is used for material discharge transition, which can release the rolling pressure. In use, after the first mold 10 and the second mold 20 clamp the optical nail together (to prevent slippage), the optical nail begins to contact the first side wall 131. The cutting edge of the first side wall 131 rolls into the optical nail, and the squeezed material flows downward and is discharged, forming a groove 95 and a retaining ring 94. As the rolling process proceeds, the rolling depth and width gradually increase, and the depth of the groove 95 and the outer diameter of the retaining ring 94 gradually increase until the first vertical surface 32 ends.

[0072] In one exemplary embodiment, the binding part 1 is further provided with a second vertical surface 12 and a first surface 11. The binding protrusion 13 protrudes from the second vertical surface 12 along the second direction 8. The top end of the second vertical surface 12 is connected to the lower surface of the binding protrusion 13, and the bottom end of the second vertical surface 12 is connected to the first surface 11. The second vertical surface 12 is used for the preliminary shaping of the outer peripheral wall of the retaining ring 94, while the first surface 11 is used for the preliminary shaping of the lower surface of the retaining ring 94, making it easier to push the material later.

[0073] In one exemplary embodiment, the top surface of the bracing protrusion 13 is flat, which makes the head 91 of the optical nail have a larger supporting area and facilitates processing.

[0074] In one exemplary embodiment, the pusher part 2 is further provided with a third vertical surface 21, and the pusher protrusion 22 protrudes relative to the third vertical surface 21 along the second direction 8. The upper surface of the pusher protrusion 22 is also provided with a second inclined surface 222, which is connected to the third vertical surface 21 and protrudes along the second direction 8 and tilts downward. The second inclined surface 222 is located on the first direction 7 of the first inclined surface 221.

[0075] During processing, the third vertical surface 21 is in close contact with the outer peripheral wall of the retaining ring 94, restricting the free flow of material and playing a shaping and correcting role for the retaining ring 94. This further ensures the stability of the outer diameter of the retaining ring 94 and its fit with the sheet metal hole of the hand part. At the same time, the size of the outer diameter of the retaining ring 94 can be adjusted according to the position of the third vertical surface 21 relative to the pusher protrusion 22. Meanwhile, the second inclined surface 222 further shapes the lower surface of the retaining ring 94, making the shape of the retaining ring 94 better. The third vertical surface 21 is located on the side of the second vertical surface 12 away from the second mold 20, which allows the retaining ring 94 formed at the pusher protrusion 22 to have a larger outer diameter than the retaining ring 94 formed at the tie protrusion 13.

[0076] In one exemplary embodiment, the surface of the pusher protrusion 22 that is away from the third vertical surface 21 is the fourth vertical surface 223. 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 optical nail through the plane and make the shape of the optical nail below the retaining ring 94 better.

[0077] In one exemplary embodiment, the first mold 10 is further provided with a first thread 3, which is located below the material-binding part 1 and the material-pushing part 2. The second mold 20 is provided with a second thread 6 that is adapted to the first thread 3, thereby realizing the integral forming of the thread 92, which is more convenient, improves efficiency, and is achieved by rolling process, resulting in high material utilization.

[0078] In one exemplary embodiment, 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 mating protrusion 5 protruding in the opposite direction to 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 in the first direction 7. The fourth inclined surface 51 protrudes in the opposite direction to the second direction 8 and slopes downward to assist in the forming of the lower surface of the retaining ring 94. The third inclined surface 52 gradually slopes downward in the first direction 7 to realize material feeding guidance and assist in the forming of the lower surface of the retaining ring 94.

[0079] In one exemplary embodiment, the mating part is further provided with a fifth vertical surface 4, and the mating protrusion 5 protrudes in the opposite direction to the fifth vertical surface 4 along the second direction 8. One end of the fourth inclined surface 51 and the third inclined surface 52 are connected to the fifth vertical surface 4. The fifth vertical surface 4 assists in the forming of the outer peripheral wall of the retaining ring 94.

[0080] In one exemplary embodiment, the protrusion 5 is further provided with a sixth vertical surface 53, and the ends of the fourth inclined surface 51 and the third inclined surface 52 that are away from the fifth vertical surface 4 are connected to the sixth vertical surface 53, so as to push the optical nail through the plane and make the shape of the optical nail below the retaining ring 94 better.

[0081] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A rolling die, characterized in that: include The first mold (10) includes a binding part (1) and a pushing part (2) arranged along a first direction (7) at its top. The binding part (1) is provided with a binding protrusion (13) protruding along a second direction (8) perpendicular to the first direction (7). The lower surface of the binding protrusion (13) protrudes along the second direction (8) and is inclined upward. The pushing part (2) is provided with a pushing protrusion (22) protruding along the second direction (8). The upper surface of the pushing protrusion (22) is provided with a first inclined surface (221) inclined upward along the first direction (7). The starting end of the first inclined surface (221) is located below the lower surface of the binding protrusion (13). The second mold (20) is adapted to move relative to the first mold (10) in a first direction (7) and cooperate with the binding part (1) and the pushing part (2) to form the groove (95) and retaining ring (94) of the fastener.

2. The rolling die as described in claim 1, characterized in that: The tying protrusion (13) is provided with a first sidewall (131), a first vertical surface (32) and a second sidewall (133) connected sequentially along a first direction (7). The first vertical surface (32) is located on the second direction (8) of the first sidewall (131) and the second sidewall (133). The first sidewall (131) and the second sidewall (133) are inclined surfaces. The first sidewall (131) gradually approaches the first vertical surface (32) along the first direction (7), and the second sidewall (133) gradually moves away from the first vertical surface (32) along the first direction (7).

3. A rolling die as described in claim 1, characterized in that: The binding part (1) is further provided with a second vertical surface (12) and a first surface (11). The binding protrusion (13) protrudes from the second vertical surface (12) along the second direction (8). The top end of the second vertical surface (12) is connected to the lower surface of the binding protrusion (13), and the bottom end of the second vertical surface (12) is connected to the first surface (11).

4. A rolling die as described in claim 1, characterized in that: The top surface of the tack protrusion (13) is a plane.

5. A rolling die as described in claim 3, characterized in that: The pusher part (2) is also provided with a third vertical surface (21). The pusher protrusion (22) protrudes from the third vertical surface (21) along the second direction (8). The upper surface of the pusher 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 from the second direction (8) and tilts downward. The second inclined surface (222) is located on 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 mold (20).

6. A rolling die as described in claim 5, characterized in that: The surface of the pusher protrusion (22) facing away from the third vertical surface (21) is the 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 rolling die as described in claim 1, characterized in that: The first mold (10) is also provided with a first tooth (3), which is located below the material-binding part (1) and the material-pushing part (2). The second mold (20) is provided with a second tooth (6) that is adapted to the first tooth (3).

8. A rolling die as described in claim 1, characterized in that: 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 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 in the first direction (7). The fourth inclined surface (51) protrudes in the opposite direction of the second direction (8) and slopes downward. The third inclined surface (52) gradually slopes downward in the first direction (7).

9. A rolling die as described in claim 8, characterized in that: The mating part is also provided with a fifth vertical surface (4), and the mating protrusion (5) protrudes in the opposite direction of the second direction (8) 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).

10. A rolling die as described in claim 9, characterized in that: The mating protrusion (5) is also provided with a sixth vertical surface (53), and the ends of the fourth inclined surface (51) and the third inclined surface (52) opposite to the fifth vertical surface (4) are connected to the sixth vertical surface (53).

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