A cold heading device and method for a blind rivet

Abstract

The application relates to the technical field of cold upsetting forming of draw nuts, and discloses a cold upsetting forming device and method of draw nuts, which comprises a base, a cold upsetting lower die, a rear assembly, a cold upsetting upper die, a position-adjusting clamping assembly, a push-fitting drawer, a long-distance push-fitting rod, a short-distance push-fitting rod and a push assembly. When the draw nut is ejected, the push assembly is arranged to push and transfer through the push-fitting rod, and the push-fitting rod comprises the long-distance push-fitting rod and the short-distance push-fitting rod. The long-distance push-fitting rod and the short-distance push-fitting rod are arranged to respectively position the front forming groove and the rear forming groove at the cold upsetting station, the short-distance push-fitting rod is used to short-distance ejection to only complete demolding of the formed draw nut, the draw nut cannot be excessively ejected from the rear forming groove, the draw nut can be conveniently adjusted to move to the blanking station, the draw nut is prevented from moving and falling due to external force, and the device is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of cold heading technology for rivets, and more particularly to a cold heading apparatus and method for rivets. Background Technology

[0002] Rivets are single-sided fasteners used in many industries. Their typical structure consists of two parts: a shank and a shell. The shank is broken or pulled out using a special rivet gun, causing the shell to expand and deform on one side of the connector, forming a strong riveted joint.

[0003] The production process of rivets involves cold heading, a process in which pressure is applied to the metal blank at room temperature during cold heading, causing it to plastically flow within the mold cavity to complete the cold heading process. The cold heading apparatus for rivets includes a lower die for blank forming and an upper die for pressing and forming. It also has a push-out structure to eject the rivet from the lower die after cold heading for easy removal.

[0004] Existing cold heading forming devices for rivets typically have multiple cold heading grooves in the lower die. By adjusting the movement of the lower die along the cold heading station, the cold heading grooves are sequentially aligned with the upper die for cold heading, allowing for the cold heading of multiple rivets. However, to ensure the stable ejection and positioning of the rivets after forming, existing cold heading forming devices often use a long-stroke pusher assembly. This means that even after the rivets are fully cold-headed, they are still ejected by the long-stroke pusher assembly, leaving a significant portion of the formed rivet exposed on the upper die. This can lead to accidental falls when the upper die moves with the formed rivets under external force. Therefore, this solution proposes a cold heading forming device and method to address these issues. Summary of the Invention

[0005] In view of this, the present invention proposes a cold heading forming device and method for rivets, in order to solve the technical problem that after the existing rivets are cold-headed, they are still pushed out by a long-stroke pusher component, and a large part of the shaped rivet is exposed outside the cold heading forming upper die. As a result, when the forming upper die carries the shaped rivet, it may fall off accidentally under the action of external force.

[0006] The technical solution of this invention is implemented as follows: This invention provides a cold heading forming device for rivets, including a base, a lower cold heading die, a rear assembly, an upper cold heading die, an adjustment and clamping assembly, a push-fitting drawer, a long-distance push-fitting rod, a short-distance push-fitting rod, and a push-fitting assembly, wherein... The base is provided with a top assembly groove, and the cold heading forming lower die is movably connected to the inner side of the top assembly groove and moves in the length direction of the base. The cold heading forming lower die is provided with a plurality of cold heading forming groove groups, the cold heading forming groove group including a front forming groove and a rear forming groove distributed along the moving direction of the cold heading forming lower die. The bottom of the base is provided with a plurality of push holes that communicate with the cold heading forming groove groups. The rear assembly is mounted on the base, and the cold heading upper die is movably connected to the rear assembly and moves in the height direction of the base to cold head the rivets in the cold heading groove group. The adjusting clamping assembly is movably connected to the rear fitting and is used to remove the pull studs in the front forming groove and supply them to the rear forming groove. The push-fit drawer is located inside the base and below the cold heading die. The top of the push-fit drawer has two insertion holes. The long-distance push-fit rod and the short-distance push-fit rod are respectively movably connected to the inner side of the two insertion holes. They are both used to move along the insertion holes, pass through the push holes, and push out the pull studs in the cold heading forming groove. The length of the long-distance push-fit rod is greater than the length of the short-distance push-fit rod. A push assembly is disposed below the push mating drawer and is used to push the long-distance push mating rod and the short-distance push mating rod upward.

[0007] Based on the above technical solutions, preferably, the inner side of the top assembly groove is provided with an inner assembly groove, and the outer side of the base is provided with an assembly through hole that communicates with the inner assembly groove. The push-fit drawer passes through the push-fit drawer and extends to the inner side of the inner assembly groove, and the push-fit assembly is disposed on the inner side of the rear assembly.

[0008] Based on the above technical solutions, preferably, the top of the insertion hole is provided with an anti-mistake groove, the inner side of the push hole is provided with a mating anti-mistake groove, the mating anti-mistake groove is connected to the cold heading forming groove group and the bottom of the base, and the periphery of the long-distance push mating rod and the short-distance push mating rod are provided with anti-mistake protrusions, the anti-mistake protrusions are inserted into the inner side of the anti-mistake groove, and are used to move along the anti-mistake groove to the inner side of the mating anti-mistake groove.

[0009] Based on the above technical solutions, preferably, two assembly clearance holes are provided on the front side of the base. The assembly clearance holes are connected to the inner assembly groove, and the two assembly clearance holes are respectively positioned opposite to the long-distance push-fit rod and the short-distance push-fit rod. The length of the assembly clearance hole is adapted to the length of the long-distance push-fit rod.

[0010] Based on the above technical solutions, preferably, the jacking assembly includes internal fittings, a jacking seat, a jacking rod, and a jacking spring, wherein, The interior fittings are disposed inside the interior assembly slot, and the pusher seat is slidably disposed inside the interior fittings and moves in the height direction of the base. Two push rods are provided on the internal fitting and are respectively positioned opposite the long-distance push-fit rod and the short-distance push-fit rod in the height direction, for pushing the long-distance push-fit rod and the short-distance push-fit rod upward; A push spring is disposed between the inner fitting and the push seat to reset the moving position of the push seat.

[0011] Based on the above technical solutions, the preferred embodiment further includes a bottom sliding base, a locking spring, a self-locking pressing block, and a self-locking adjusting top block, wherein... The bottom sliding seat is slidably disposed below the top push seat and moves in the width direction of the base; A retaining spring is disposed between the bottom sliding seat and the top pushing seat to reset the sliding position of the bottom sliding seat; The inner side of the internal fitting has an installation groove, the self-locking press block is set inside the installation groove, the self-locking press block is a conical block, and a self-locking sliding channel is formed between the two side walls of the self-locking press block and the groove wall of the installation groove. A sliding block is provided on the bottom sliding seat, the sliding block is slidably connected to the inner side of the self-locking sliding channel, and a heart-shaped slot for the sliding block to be inserted is provided at the bottom of the self-locking press block. A self-locking adjustment top block is disposed inside the mounting groove and located below the pressing self-locking block. The self-locking adjustment top block is a conical block, and the top of the self-locking adjustment top block is offset from the heart-shaped slot in the height direction.

[0012] Based on the above technical solutions, a preferred embodiment also includes an external adjustment plate, wherein... The outer side of the base is provided with an adjustment hole that communicates with the inner assembly groove; An external adjustment plate is fixedly connected to the push seat and extends through the adjustment hole to the outside of the base.

[0013] Based on the above technical solutions, a preferred embodiment also includes an adjusting pressure roller, wherein... The inner side of the inner assembly slot is provided with a rear assembly slot, and the inner assembly part has an opening on the side corresponding to the rear assembly slot. The adjusting pressure roller is rotatably disposed on the inner side of the inner assembly groove, and four pressure plates are disposed on the periphery of the adjusting pressure roller. When the adjusting pressure roller rotates, the pressure plates are used to press the push seat downward.

[0014] Based on the above technical solutions, preferably, the adjusting clamping assembly includes a first sliding base, a second sliding base, a third sliding base, and an adjusting clamp, wherein, The first sliding joint is slidably mounted on the rear fitting and moves in the width direction of the base; The second sliding seat is slidably disposed on the first sliding seat and moves in the height direction of the base; The third sliding seat is slidably disposed on the second sliding seat and moves along the length direction of the base; An adjustment fixture, mounted on the third sliding seat, is used to hold the pull studs at the cold heading forming groove assembly.

[0015] This invention also proposes a method for cold heading of rivets, which is completed using the aforementioned cold heading apparatus for rivets, and includes the following steps: S1. Adjust the lower die of cold heading to move along the top assembly groove, and supply multiple metal blanks to be cold-headed to the front forming groove of the cold heading groove group in sequence; S2. When the cold heading forming groove group moves to the cold heading forming upper die, fix the cold heading forming lower die and adjust the cold heading forming upper die to move downward to complete the initial forming process of the metal blank at the front forming groove. S3. After the initial forming is completed, the long-distance push-fit rod is pushed upward by the push-up component to completely push out the pull studs formed by the initial cold heading in the front forming groove. S4. Adjust the positioning clamping component to clamp the pull stud at the front forming groove and supply it to the rear forming groove. S5. Adjust the cold heading upper die to move downwards to complete the forming process of the tie rod at the rear forming groove. S6. After complete molding, the short-pitch push rod is pushed upward by the push assembly to push out the fully molded rivet part in the rear molding groove, thus completing the demolding. S7. Continue to adjust the movement of the cold heading die, and remove the cold-headed rivet from the rear forming groove at the blanking station.

[0016] The cold heading apparatus and method for rivets of the present invention have the following advantages over the prior art: (1) The cold heading forming apparatus of this application is configured to allow the lower cold heading die to move along the top assembly groove, so that the metal billet can be continuously supplied to the upper cold heading die by continuously supplying the cold heading forming groove group on the lower cold heading die, for multiple rivet cold heading forming processes. By setting the cold heading forming groove group including a front forming groove and a rear forming groove, the front forming groove and the rear forming groove form a complete rivet cold heading forming production line. In this way, when the cold heading forming groove group moves to the upper cold heading die, the rivet can be clamped and supplied by the adjusting clamping component, which facilitates the multi-station cold heading forming process of rivets through the upper cold heading die. By configuring the push assembly to eject the pull stud, the push is transmitted through push rods. These push rods include long-distance and short-distance push rods. When the push assembly pushes upwards, it first contacts the long-distance push rod, pushing it a considerable distance before contacting the short-distance push rod. This arrangement of long-distance and short-distance push rods aligns the pre-forming components at the cold heading station. The design incorporates a pre-formed groove and a post-formed groove. This allows the rivet in the pre-formed groove to be fully ejected by a long-distance push rod after initial cold forging, while the rivet in the post-formed groove, after complete cold forging, is ejected by a short-distance push rod. This short-distance ejection by the short-distance push rod only completes the demolding of the formed rivet, preventing it from being excessively ejected from the post-formed groove. This facilitates the adjustment of the rivet in the post-formed groove when it is moved to the unloading station, preventing it from falling due to external forces and making it convenient to use.

[0017] (2) By setting a self-locking adjusting top block, when the rivet is placed inside the cold heading forming groove, in order to prevent the push-fitting rod from blocking the placement of the rivet, the push-fitting seat can be pressed down in advance. At this time, the push-fitting seat drives the bottom sliding seat to move downward. Under the abutment of the sliding block and the pressing self-locking block, the bottom sliding seat moves along the push-fitting seat. The locking spring undergoes elastic deformation. When the sliding block moves to the bottom end of the pressing self-locking block, the sliding seat resets a certain distance under the action of the locking spring, while the sliding block moves... The pusher inserts into the heart-shaped slot, and under the constraint of the heart-shaped slot, it completes the self-locking positioning of the pusher seat. After the rivet is inserted, when it is necessary to push the rivet for cold heading, the pusher seat is adjusted to move downward. At this time, the conical top of the self-locking adjusting block abuts against the sliding block, and the sliding block continues to move in a staggered manner, so that the sliding block disengages from the heart-shaped slot in the height direction. The pusher seat can then be adjusted to move upward to complete the ejection of the rivet, which is convenient to use.

[0018] (3) An adjusting pressure roller is rotatably installed on one side of the jacking seat. When the jacking rod pushes the pull rod upward and the jacking seat needs to be reset, the adjusting pressure roller is adjusted to rotate in the set direction. At this time, the pressure plate on the adjusting pressure roller can press down on the jacking seat, causing the jacking seat to move downward for the next jacking operation. Four pressure plates are set around the adjusting pressure roller, and the four pressure plates are evenly distributed. This way, after the pressure plates press down on the jacking seat and then detach from the jacking seat, the pressure plates above do not obstruct the normal upward movement of the jacking seat, making it convenient to use. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front perspective view of the cold heading forming apparatus and method for rivets of the present invention; Figure 2 This is a rear perspective view of the rivet cold heading forming apparatus and method of the present invention; Figure 3 This is a right view of the rivet cold heading forming apparatus and method of the present invention; Figure 4 The cold heading apparatus and method for rivet forming according to the present invention Figure 3 A schematic cross-sectional view of the structure at point AA shown. Figure 5 The cold heading apparatus and method for rivet forming according to the present invention Figure 4 An enlarged view of point B is shown below; Figure 6 This is a three-dimensional schematic diagram of the base structure of the cold heading forming apparatus and method for rivets of the present invention; Figure 7 The present invention relates to a cold heading apparatus and method for rivet forming. Figure 6 A front view of the structure shown; Figure 8 The cold heading apparatus and method for rivet forming according to the present invention Figure 7 A cross-sectional view of the structure at point BB shown. Figure 9 This is a perspective view of the internal components structure of the cold heading forming apparatus and method for rivets of the present invention; Figure 10 This is a schematic diagram showing the connection method between the internal components and the self-locking pressing block of the rivet cold heading forming apparatus and method of the present invention.

[0021] In the diagram: 1. Base; 11. Top assembly slot; 12. Inner assembly slot; 13. Assembly through hole; 14. Assembly clearance hole; 15. Mounting slot; 16. Adjustment hole; 17. Rear assembly slot; 2. Cold heading lower die; 21. Cold heading slot assembly; 211. Front forming slot; 212. Rear forming slot; 213. Push hole; 214. Misalignment anti-fooling slot; 31. Rear assembly accessories; 32. Cold heading upper die; 33. Adjustment clamping assembly; 331. First sliding seat; 332. Second sliding seat; 333. Third sliding seat; 334. Adjustment clamp. 41. Push-up matching drawer; 411. Insertion hole; 412. Anti-foolproof bracket; 42. Long-distance push-up matching rod; 43. Short-distance push-up matching rod; 44. Anti-foolproof protrusion; 45. Lock; 5. Push-up assembly; 51. Internal accessories; 52. Push-up seat; 53. Push-up rod; 54. Push-up spring; 55. Bottom sliding seat; 56. Clamping spring; 57. Sliding block; 61. Press-to-lock self-locking block; 611. Self-locking sliding channel; 612. Heart-shaped slot; 62. Self-locking adjusting top block; 63. External adjusting plate; 7. Adjusting pressure roller; 71. Pressure plate. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1-10As shown, the cold heading forming device for rivets of the present invention includes a base 1, a lower cold heading die 2, a rear assembly 31, an upper cold heading die 32, an adjustment and clamping assembly 33, a push-fitting drawer 41, a long-distance push-fitting rod 42, a short-distance push-fitting rod 43, and a push-fitting assembly 5. The base 1 has a top assembly groove 11, and the lower cold heading die 2 is movably connected to the inner side of the top assembly groove 11 along the length direction of the base 1. The lower cold heading die 2 is movable and has multiple cold heading groove groups 21. Each cold heading groove group 21 includes a front forming groove 211 and a rear forming groove 212 distributed along the moving direction of the lower cold heading die 2. The bottom of the base 1 has multiple push holes 213 communicating with the cold heading groove groups 21. A rear mounting component 31 is mounted on the base 1, and the upper cold heading die 32 is movably connected to the rear mounting component 31. The height-moving mechanism is used for cold heading of the rivets in the cold heading forming groove 21; the adjusting clamping assembly 33 is movably connected to the rear fitting 31 to remove the rivets in the front forming groove 211 and supply them to the rear forming groove 212; the push-fitting drawer 41 is located inside the base 1 and below the cold heading forming lower die 2, and the top of the push-fitting drawer 41 has two insertion holes 411; the long-distance push-fitting rod 42 and the short-distance push-fitting rod 43 are movably connected to the inside of the two insertion holes 411, and are used to move along the insertion holes 411, pass through the push-hole 213, and push out the rivets in the cold heading forming groove 21, and the length of the long-distance push-fitting rod 42 is greater than the length of the short-distance push-fitting rod 43; the push-fitting assembly 5 is located below the push-fitting drawer 41 and is used to push the long-distance push-fitting rod 42 and the short-distance push-fitting rod 43 upward.

[0024] In practice, the long-distance jacking rod 42 is used to align the front forming groove 211 in the height direction, and the short-distance jacking rod 43 is used to align the rear forming groove 212 in the height direction.

[0025] In practice, the lower cold heading die 2 is adjusted to move along the top mounting groove 11, and multiple metal blanks to be cold-headed are sequentially supplied to the front forming groove 211 of the cold heading groove group 21. When the cold heading groove group 21 moves to the upper cold heading die 32, the lower cold heading die 2 is fixed, and the upper cold heading die 32 is adjusted to move downward to complete the initial forming process of the metal blanks at the front forming groove 211. After the initial forming is completed, the long-distance push-fit rod 42 is pushed upward by the push assembly 5. At this time, the long-distance push-fit rod 42 passes through the push hole 213 and extends into the interior of the front forming groove 211, pulling the initial cold heading forming in the front forming groove 211. The rivet is fully ejected; the adjusting clamping component 33 clamps the rivet at the front forming groove 211 and supplies it to the rear forming groove 212; the cold heading upper die 32 is adjusted to move downward to complete the full forming of the rivet at the rear forming groove 212; after full forming, the short-distance push-fit rod 43 is pushed upward by the push component 5. At this time, the short-distance push-fit rod 43 passes through the push hole 213 and extends into the interior of the rear forming groove 212, ejecting the fully formed rivet part in the rear forming groove 212, and only demolding is completed; the movement of the cold heading lower die 2 is continued to be adjusted, and the cold-headed rivet is taken out from the rear forming groove 212 at the unloading station.

[0026] The cold heading forming apparatus of this application is configured such that the lower cold heading die 2 can move along the top mounting groove 11, allowing metal blanks to be continuously supplied to the upper cold heading die 32 via the cold heading forming groove group 21 on the lower cold heading die 2, for multiple rivet cold heading processes. The cold heading forming groove group 21 includes a front forming groove 211 and a rear forming groove 212. The front forming groove 211, in conjunction with the rear forming groove 212, forms a complete rivet cold heading production line. When the cold heading forming groove group 21 moves to the upper cold heading die 32, the rivets can be clamped and supplied via the adjusting clamping component 33, facilitating multi-station cold heading processing of rivets via the upper cold heading die 32. When the push assembly 5 ejects the pull stud, it needs to be pushed and transferred through the push rods. These push rods include a long-distance push rod 42 and a short-distance push rod 43. When the push assembly 5 pushes upwards, it first abuts against the long-distance push rod 42, pushing it a considerable distance before contacting the short-distance push rod 43. The long-distance push rod 42 and the short-distance push rod 43 are aligned with the pre-forming groove 2 at the cold heading station. The front forming groove 211 and the rear forming groove 212 are designed so that after the rivet at the front forming groove 211 is initially cold-forged, it can be completely pushed out by the long-distance push rod 42. After the rivet at the rear forming groove 212 is completely cold-forged, it is pushed out by the short-distance push rod 43. The short-distance push rod 43 pushes out the rivet after it is formed, which only completes the demolding of the rivet after it is formed, and does not push the rivet out of the rear forming groove 212 excessively. This makes it convenient to adjust the rivet at the rear forming groove 212 when it is moved to the unloading station, and prevents the rivet from moving and falling off due to external forces, which is convenient to use.

[0027] In a preferred embodiment, an inner assembly groove 12 is provided on the inner side of the top assembly groove 11, and an assembly through hole 13 communicating with the inner assembly groove 12 is provided on the outer side of the base 1. The push-fit drawer 41 passes through the push-fit drawer 41 and extends to the inner side of the inner assembly groove 12, and the push-fit component 5 is provided on the inner side of the rear assembly component 31.

[0028] In practice, the outer side of the base 1 is provided with a latch 45 for positioning the push-pull mating drawer 41 to insert into the position.

[0029] In a preferred embodiment, the top of the insertion hole 411 is provided with a foolproof support groove 412, and the inner side of the push hole 213 is provided with a mating foolproof groove 214. The mating foolproof groove 214 is connected to the bottom of the cold heading forming groove group 21 and the base 1. The periphery of the long-distance push mating rod 42 and the short-distance push mating rod 43 are provided with foolproof protrusions 44. The foolproof protrusions 44 are inserted into the inner side of the foolproof support groove 412 and are used to move along the foolproof support groove 412 to the inner side of the mating foolproof groove 214.

[0030] This design, with the push-fit rod inserted into the inner side of the insertion hole 411, facilitates the installation and removal of the push-fit rod. When it is necessary to completely push out the pull stud at the rear forming groove 212, simply remove the short-distance push-fit rod 43 and replace it with the long-distance one after pulling out the push-fit drawer 41. The anti-misalignment groove 412 supports the push-fit rod from below, ensuring the push-fit plate is stably positioned inside the push-fit drawer 41, facilitating the removal and replacement of the push-fit rod. The push hole 213 has a matching anti-misalignment groove 214 that mates with the anti-misalignment groove 412, allowing the push-fit rod to extend along the push hole 213 to the inner side of the cold heading forming groove assembly 21, facilitating use.

[0031] In a preferred embodiment, two assembly clearance holes 14 are provided on the front side of the base 1. The assembly clearance holes 14 are connected to the inner assembly groove 12, and the two assembly clearance holes 14 are respectively positioned opposite to the long-distance push-fit rod 42 and the short-distance push-fit rod 43. The length of the assembly clearance hole 14 is adapted to the length of the long-distance push-fit rod 42.

[0032] In a preferred embodiment, the push assembly 5 includes an inner fitting 51, a push seat 52, push rods 53, and a push spring 54. The inner fitting 51 is disposed inside the inner mounting groove 12, and the push seat 52 is slidably disposed inside the inner fitting 51 and moves in the height direction of the base 1. Two push rods 53 are disposed on the inner fitting 51 and are respectively positioned opposite to the long-distance push-fit rod 42 and the short-distance push-fit rod 43 in the height direction, for pushing the long-distance push-fit rod 42 and the short-distance push-fit rod 43 upward. The push spring 54 is disposed between the inner fitting 51 and the push seat 52 and is used to reset the moving position of the push seat 52.

[0033] It also includes a bottom sliding base 55, a locking spring 56, a self-locking pressing block 61, and a self-locking adjusting top block 62. The bottom sliding base 55 is slidably disposed below the top pushing base 52 and moves in the width direction of the base 1. The locking spring 56 is disposed between the bottom sliding base 55 and the top pushing base 52 to reset the sliding position of the bottom sliding base 55. An installation groove 15 is provided on the inner side of the internal fitting 51, and the self-locking pressing block 61 is disposed inside the installation groove 15. The self-locking pressing block 61 is a conical block, and the two sides of the self-locking pressing block 61... A self-locking sliding channel 611 is formed between the side wall and the wall of the mounting groove 15. A sliding block 57 is provided on the bottom sliding seat 55. The sliding block 57 is slidably connected to the inside of the self-locking sliding channel 611. A heart-shaped slot 612 for the sliding block 57 to be inserted is provided at the bottom of the self-locking block 61. The self-locking adjusting top block 62 is provided inside the mounting groove 15 and is located below the self-locking block 61. The self-locking adjusting top block 62 is a conical block, and the top of the self-locking adjusting top block 62 is offset from the heart-shaped slot 612 in the height direction.

[0034] By setting a self-locking adjusting top block 62, when the rivet is placed inside the cold heading forming groove assembly 21, in order to prevent the top pushing rod from obstructing the placement of the rivet, the top pushing seat 52 can be pressed down in advance. At this time, the top pushing seat 52 drives the bottom sliding seat 55 to move downward. Under the abutment action of the sliding block 57 and the pressing self-locking block 61, the bottom sliding seat 55 moves along the top pushing seat 52. The locking spring 56 undergoes elastic deformation. When the sliding block 57 moves to the bottom end of the pressing self-locking block 61, the bottom sliding seat 55 returns to its original position by a certain distance under the action of the locking spring 56, while the sliding block... 57 moves to the inside of the heart-shaped slot 612. Under the restriction of the heart-shaped slot 612, the self-locking position of the pusher seat 52 is completed. After the rivet is inserted, when it is necessary to push the rivet for cold heading, the pusher seat 52 is adjusted to move downward. At this time, the conical top of the self-locking adjusting block 62 abuts against the sliding block 57, and the sliding block 57 continues to move in a staggered manner, so that the sliding block 57 is disengaged from the heart-shaped slot 612 in the height direction. The pusher seat 52 can then be adjusted to move upward to complete the push-out process of the rivet, which is convenient to use.

[0035] In a preferred embodiment, an outer adjustment plate 63 is also included, wherein an adjustment hole 16 communicating with the inner assembly groove 12 is provided on the outer side of the base 1; the outer adjustment plate 63 is fixedly connected to the push seat 52 and extends to the outer side of the base 1 through the adjustment hole 16.

[0036] With this design, when it is necessary to replace the push-fit rod, in order to allow the push-fit rod to be fully moved into the push-fit drawer 41, the push-fit seat 52 can be fully pressed down by the external adjustment plate 63, so that the sliding block 57 can slide to the bottom, which is convenient for use.

[0037] In a preferred embodiment, the device also includes a positioning pressure roller 7, wherein a rear assembly groove 17 is provided on the inner side of the inner assembly groove 12, and an opening is formed on one side of the inner assembly part 51 corresponding to the rear assembly groove 17; the positioning pressure roller 7 is rotatably disposed on the inner side of the inner assembly groove 12, and four pressure plates 71 are provided on the periphery of the positioning pressure roller 7. When the positioning pressure roller 7 rotates, the pressure plates 71 are used to press the push seat 52 downward.

[0038] An adjusting pressure roller 7 is rotatably mounted on one side of the push base 52. When the push rod 53 pushes the pull rod upwards and the push base 52 needs to be reset, the adjusting pressure roller 7 rotates in a set direction. At this time, the pressure plate 71 on the adjusting pressure roller 7 can press the push base 52 downwards, causing the push base 52 to move downwards for the next push operation. Four pressure plates 71 are arranged equidistantly around the adjusting pressure roller 7. This ensures that after the pressure plates 71 have pressed down on the push base 52 and disengaged from it, the upper pressure plates 71 do not obstruct the normal upward movement of the push base 52, facilitating its use.

[0039] In specific implementation, the adjustment clamping assembly 33 includes a first sliding seat 331, a second sliding seat 332, a third sliding seat 333, and an adjustment clamp 334. The first sliding seat 331 is slidably disposed on the rear mounting part 31 and moves in the width direction of the base 1; the second sliding seat 332 is slidably disposed on the first sliding seat 331 and moves in the height direction of the base 1; the third sliding seat 333 is slidably disposed on the second sliding seat 332 and moves in the length direction of the base 1; the adjustment clamp 334 is disposed on the third sliding seat 333 and is used to clamp the rivets at the cold heading forming groove assembly 21.

[0040] This invention also proposes a method for cold heading of rivets, which is completed using the aforementioned cold heading apparatus for rivets, and includes the following steps: Step 1: Adjust the lower die 2 of cold heading to move along the top assembly groove 11, and feed multiple metal blanks to be cold-headed to the front forming groove 211 of the cold heading groove group 21 in sequence; Step 2: When the cold heading forming groove group 21 moves to the cold heading forming upper die 32, fix the cold heading forming lower die 2 and adjust the cold heading forming upper die 32 to move downward to complete the initial forming treatment of the metal blank at the front forming groove 211. Step 3: After the initial forming is completed, the long-distance push-fit rod 42 is pushed upward by the push-up component 5. At this time, the long-distance push-fit rod 42 passes through the push-up hole 213 and extends into the interior of the front forming groove 211, completely pushing out the rivets formed by the initial cold heading in the front forming groove 211. Step 4: Adjust the positioning clamping component 33 to clamp the rivet at the front forming groove 211 and supply it to the rear forming groove 212; Step 5: Adjust the cold heading upper die 32 to move downwards to complete the forming process of the rivet at the rear forming groove 212; Step 6: After complete molding, push the short-pitch push fitting rod 43 upward through the push assembly 5. At this time, the short-pitch push fitting rod 43 passes through the push hole 213 and extends into the interior of the rear molding groove 212, pushing out the fully molded rivet part in the rear molding groove 212, thus completing the demolding. Step 7: Continue to adjust the movement of the cold heading lower die 2, and remove the cold-headed rivet from the rear forming groove 212 at the blanking station.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold heading forming device for rivets, characterized in that: This includes a base, a lower cold heading die, post-assembly components, an upper cold heading die, an adjustment and clamping assembly, a push-fit drawer, a long-distance push-fit rod, a short-distance push-fit rod, and a push-fit assembly. The base is provided with a top assembly groove, and the cold heading forming lower die is movably connected to the inner side of the top assembly groove and moves in the length direction of the base. The cold heading forming lower die is provided with a plurality of cold heading forming groove groups, the cold heading forming groove group including a front forming groove and a rear forming groove distributed along the moving direction of the cold heading forming lower die. The bottom of the base is provided with a plurality of push holes that communicate with the cold heading forming groove groups. The rear assembly is mounted on the base, and the cold heading upper die is movably connected to the rear assembly and moves in the height direction of the base to cold head the rivets in the cold heading groove group. The adjusting clamping assembly is movably connected to the rear fitting and is used to remove the pull studs in the front forming groove and supply them to the rear forming groove. The push-fit drawer is located inside the base and below the cold heading die. The top of the push-fit drawer has two insertion holes. The long-distance push-fit rod and the short-distance push-fit rod are respectively movably connected to the inner side of the two insertion holes. They are both used to move along the insertion holes, pass through the push holes, and push out the pull studs in the cold heading forming groove. The length of the long-distance push-fit rod is greater than the length of the short-distance push-fit rod. A push assembly is located below the push-fitting drawer and is used to push the long-distance push-fitting rod and the short-distance push-fitting rod upward.

2. The cold heading forming apparatus for rivets as described in claim 1, characterized in that: The inner side of the top assembly slot is provided with an inner assembly slot, and the outer side of the base is provided with an assembly through hole that communicates with the inner assembly slot. The push-fit drawer passes through the push-fit drawer and extends to the inner side of the inner assembly slot, and the push-fit assembly is located on the inner side of the rear assembly part.

3. The cold heading forming apparatus for rivets as described in claim 1, characterized in that: The top of the insertion hole is provided with a foolproof support groove, and the inner side of the push hole is provided with a matching foolproof groove. The matching foolproof groove is connected to the bottom of the cold heading forming groove and the base. The periphery of the long-distance push matching rod and the short-distance push matching rod are provided with foolproof protrusions. The foolproof protrusions are inserted into the inner side of the foolproof support groove and are used to move along the foolproof support groove to the inner side of the matching foolproof groove.

4. The cold heading forming apparatus for rivets as described in claim 2, characterized in that: Two assembly clearance holes are provided on the front side of the base. The assembly clearance holes are connected to the inner assembly groove, and the two assembly clearance holes are respectively positioned opposite to the long-distance push-fit rod and the short-distance push-fit rod. The length of the assembly clearance hole is adapted to the length of the long-distance push-fit rod.

5. The cold heading forming apparatus for rivets as described in claim 2, characterized in that: The jacking assembly includes internal fittings, a jacking base, a jacking rod, and a jacking spring, wherein... The interior fittings are disposed inside the interior assembly slot, and the pusher seat is slidably disposed inside the interior fittings and moves in the height direction of the base. Two push rods are provided on the internal fitting and are respectively positioned opposite the long-distance push-fit rod and the short-distance push-fit rod in the height direction, for pushing the long-distance push-fit rod and the short-distance push-fit rod upward; A push spring is disposed between the inner fitting and the push seat to reset the moving position of the push seat.

6. The cold heading forming apparatus for rivets as described in claim 5, characterized in that: It also includes a bottom sliding base, a locking spring, a self-locking pressing block, and a self-locking adjusting top block, among which, The bottom sliding seat is slidably disposed below the top push seat and moves in the width direction of the base; A retaining spring is disposed between the bottom sliding seat and the top pushing seat to reset the sliding position of the bottom sliding seat; The inner side of the internal fitting has an installation groove, the self-locking press block is set inside the installation groove, the self-locking press block is a conical block, and a self-locking sliding channel is formed between the two side walls of the self-locking press block and the groove wall of the installation groove. A sliding block is provided on the bottom sliding seat, the sliding block is slidably connected to the inner side of the self-locking sliding channel, and a heart-shaped slot for the sliding block to be inserted is provided at the bottom of the self-locking press block. A self-locking adjustment top block is disposed inside the mounting groove and located below the pressing self-locking block. The self-locking adjustment top block is a conical block, and the top of the self-locking adjustment top block is offset from the heart-shaped slot in the height direction.

7. The cold heading forming apparatus for rivets as described in claim 6, characterized in that: It also includes an external adjustment plate, among which, The outer side of the base is provided with an adjustment hole that communicates with the inner assembly groove; An external adjustment plate is fixedly connected to the push seat and extends through the adjustment hole to the outside of the base.

8. The cold heading forming apparatus for rivets as described in claim 5, characterized in that: It also includes the adjusting pressure roller, among which, The inner side of the inner assembly slot is provided with a rear assembly slot, and the inner assembly part has an opening on the side corresponding to the rear assembly slot. The adjusting pressure roller is rotatably disposed on the inner side of the inner assembly groove, and four pressure plates are disposed on the periphery of the adjusting pressure roller. When the adjusting pressure roller rotates, the pressure plates are used to press the push seat downward.

9. The cold heading forming apparatus for rivets as described in claim 1, characterized in that: The positioning clamping assembly includes a first sliding base, a second sliding base, a third sliding base, and a positioning clamp, wherein, The first sliding joint is slidably mounted on the rear fitting and moves in the width direction of the base; The second sliding seat is slidably disposed on the first sliding seat and moves in the height direction of the base; The third sliding seat is slidably disposed on the second sliding seat and moves along the length direction of the base; An adjustment fixture, mounted on the third sliding seat, is used to hold the pull studs at the cold heading groove assembly.

10. A method for cold heading of rivets, characterized in that: The cold heading forming of rivets, as described in any one of claims 1 to 9, is completed using the following steps: S1. Adjust the lower die of cold heading to move along the top assembly groove, and supply multiple metal blanks to be cold-headed to the front forming groove of the cold heading groove group in sequence; S2. When the cold heading forming groove group moves to the cold heading forming upper die, fix the cold heading forming lower die and adjust the cold heading forming upper die to move downward to complete the initial forming process of the metal blank at the front forming groove. S3. After the initial forming is completed, the long-distance push-fit rod is pushed upward by the push-up component to completely push out the pull studs formed by the initial cold heading in the front forming groove. S4. Adjust the positioning clamping component to clamp the pull stud at the front forming groove and supply it to the rear forming groove. S5. Adjust the cold heading upper die to move downwards to complete the forming process of the tie rod at the rear forming groove. S6. After complete molding, the short-pitch push rod is pushed upward by the push assembly to push out the fully molded rivet part in the rear molding groove, thus completing the demolding. S7. Continue to adjust the movement of the cold heading die, and remove the cold-headed rivet from the rear forming groove at the blanking station.

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