Cold heading die, multi-station cold heading device and cold heading machine

Abstract

The utility model discloses a cold heading die, a multi-station cold heading device and a cold heading machine, the cold heading die comprises a bottom plate, a stamping die module, and a positioning module and a clamping module which are connected to the bottom plate, the stamping die module is arranged on the bottom plate, and the stamping die module and the clamping module can generate relative displacement in the radial direction; the positioning module is used for enabling the punching die module to move in a radial preset range relative to the bottom plate; the clamping module comprises a reset assembly and a plurality of clamping assemblies used for clamping and limiting the stamping die module, the multiple clamping assemblies are arranged in the circumferential direction of the positioning module at intervals and connected with the reset assembly, and the multiple clamping assemblies have the trend of moving inwards relative to the bottom plate in the radial direction of the positioning module under the action of the reset assembly. And the like; automatic alignment of the center of a cold heading part and the center of the stamping die module during eccentric pressing of the part to be subjected to cold heading and automatic reset of the initial position of the stamping die module after blanking after cold heading are completed can be achieved through stress movement of the stamping die module.

Description

Technical Field

[0001] The utility model relates to the technical field of cold heading equipment, in particular to a cold heading die, a multi-station cold heading device and a cold heading machine. Background Art

[0002] The assembly of damping spacers has always been done manually. Due to the heavy weight of the product, the assembly of damping spacers is labor-intensive, labor-intensive, and requires more manpower. In addition, the age structure of employees assembling damping spacers is relatively old and their education level is low, resulting in low product assembly quality assurance.

[0003] Among them, the last step of assembling the damping spacer bar is the cold heading process of the inner hole of the bolt head. After the damping spacer bar is assembled, multiple inner holes of the bolt head need to be placed on a special mold for stamping and expansion, so that the nuts on the bolts cannot fall off, thereby protecting the product.

[0004] At present, the cold heading process of the inner hole of the bolt head is all done manually. The damping spacer products are manually carried and placed on the punch press. One of the inner holes of the bolt head needs to be aligned with the mold, and then the punch press is operated for cold heading. Then the damping spacer products are manually rotated and adjusted, and the remaining bolt heads are cold headed in turn. After all the bolt heads are processed, the damping spacer products are manually circulated. Due to the heavy product, the labor intensity of the workers is high, the efficiency is low, and there are safety risks in the operation process. Utility Model Content

[0005] The utility model aims to provide a cold heading die, a multi-station cold heading device and a cold heading machine, so as to solve the problem that the cold heading process of the inner hole of the bolt head in the existing damping spacer assembly can only be performed at a single station, the manual labor intensity is high and the efficiency is low.

[0006] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] The utility model provides a cold heading die, comprising a base plate, a die module, a positioning module and a clamping module, wherein the die module is arranged on the base plate, and relative displacement can be generated between the two in the radial direction; the positioning module is fixedly connected to the base plate, so that the die module can move within a preset radial range relative to the base plate; the clamping module is connected to the base plate, and the clamping module comprises a reset component and a plurality of clamping components for clamping and limiting the die module, a plurality of the clamping components are arranged at intervals along the circumferential direction of the positioning module and are connected to the reset component, and the plurality of the clamping components have a reset function under the action of the reset component. The cold heading die has at least two states, in the first state, the die module is clamped and limited at the center position of the positioning module by multiple clamping assemblies in the first position; in the second state, the die module is located at a position deviated from the center position of the positioning module, at least one clamping assembly moves to a second position, the second position is farther away from the center position of the positioning module relative to the first position, and the reset assembly is in a state of accumulating force so that the clamping assembly in the second position has a tendency to move inward along the radial direction of the positioning module.

[0008] Specifically, the clamping assembly includes a guide rail, a connecting structure having a connecting wheel and a connecting plate, and a clamping structure having a clamping wheel and a clamping plate. The clamping assembly is slidably connected to the base plate via the guide rail, and the clamping assembly is slidably connected to the reset assembly via the connecting wheel. The connecting plate is fixedly connected to the guide rail, the connecting wheel and the clamping plate are fixedly connected to the connecting plate, and the clamping wheel is fixedly connected to the clamping plate.

[0009] Specifically, the reset assembly includes a reset spring, a spring stud and a cam slot plate, the cam slot plate is sleeved on the outside of the die module, one end of the reset spring is connected to the cam slot plate through the spring stud, and the other end of the reset spring is connected to the base plate through the spring seat; the cam slot plate is provided with a plurality of connecting waist grooves that cooperate with the connecting wheels of the plurality of clamping assemblies, and along the circumferential direction of the positioning module, the plurality of connecting waist grooves and the plurality of clamping assemblies are arranged one by one, and the longitudinal extension direction of the correspondingly arranged connecting waist grooves and the movement direction of the clamping assembly have an angle greater than zero, and each of the connecting waist grooves has a certain extension tendency in the radial direction of the cam slot plate.

[0010] Furthermore, the reset assembly also includes a limit plate for axially limiting the cam slot plate, the limit plate is sleeved outside the die module and is located above the cam slot plate, and the limit plate is fixedly connected to the die module.

[0011] Furthermore, the cold heading die also includes a plurality of limit assemblies for circumferentially limiting the cam slot plate, and the plurality of limit assemblies are arranged on the base plate at intervals along the circumferential direction of the cam slot plate, and the cam slot plate is formed with a plurality of limit grooves corresponding to the plurality of limit assemblies.

[0012] Specifically, the limiting assembly includes a limiting seat and a limiting wheel. The limiting seat is fixedly connected to the bottom plate. The limiting wheel is fixedly connected to the limiting seat. The limiting wheel is arranged in the limiting groove.

[0013] Specifically, the die module includes a coaxially connected die base and a die, the bottom of the die base extends radially outward to form a positioning base plate, the limit plate is fixedly connected to the die base, the outer periphery of the die head is axially extended to form a receiving groove, the center of the die head is axially extended to form a top, and the inner wall side of the receiving groove extends radially outward to form a guide rib.

[0014] Specifically, the positioning module includes a plurality of limiting pressure plates, which are connected to the base plate at intervals along the circumferential direction of the base plate, and the limiting pressure plates include an axial limiting portion and a radial limiting portion, a first distance greater than zero is present between the axial limiting portion and the positioning base plate, and a second distance not less than zero is present between the radial limiting portion and the positioning base plate.

[0015] The utility model also provides a multi-station cold heading device, comprising: a plurality of cold heading dies as described above; a base, wherein the plurality of cold heading dies are mounted on the base through the bottom plate, and the plurality of cold heading dies are arranged in one-to-one correspondence with a plurality of product parts to be cold headed.

[0016] The utility model also provides a cold heading machine, comprising the multi-station cold heading device as described above and a punching machine for installing the multi-station cold heading device.

[0017] The characteristics and advantages of the utility model are as follows: the cold heading die provided by the utility model is provided with a die module, a positioning module and a clamping module, so that the die module can move within a preset radial range relative to the base plate after being subjected to force, thereby being able to realize the automatic alignment of the center of the cold heading part and the center of the die module when the cold heading part is eccentrically pressed down through the force movement of the die module, and the automatic resetting of the die module to the initial position after the cold heading is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the cold heading die provided in the embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the planar structure of the cold heading die provided in the embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the cold heading die provided in the embodiment of the utility model in the first state;

[0022] Figure 4 It is a structural schematic diagram of the cold heading die provided in the embodiment of the utility model in the second state;

[0023] Figure 5 It is a structural schematic diagram of a multi-station cold heading device provided in an embodiment of the utility model;

[0024] Figure 6 It is a schematic diagram of the state of the four-split damping spacer provided in the embodiment of the utility model when being pressed down in the cold heading process of the inner hole of the bolt head;

[0025] Figure 7 It is a schematic diagram of the state of the four-split damping spacer provided in the embodiment of the utility model when the cold heading process of the inner hole of the bolt head is carried out in place.

[0026] Description of Figure Numbers:

[0027] 100. Cold heading die;

[0028] 10. Bottom plate; 11. Guide rail seat;

[0029] 20. Die module; 21. Die base; 211. Positioning base plate; 22. Die; 221. Accommodating groove; 222. Top; 223. Guide rib;

[0030] 30. Positioning module; 31. Limiting pressure plate; 311. Axial limiting portion; 312. Radial limiting portion;

[0031] 40. Clamping module; 41. Reset assembly; 411. Reset tension spring; 412. Tension spring stud; 413. Cam slot plate; 4131. Connecting waist slot; 4132. Limiting slot; 414. Tension spring seat; 42. Clamping assembly; 421. Guide rail; 422. Connecting wheel; 423. Connecting plate; 424. Clamping wheel; 425. Clamping plate;

[0032] 50. Limiting plate;

[0033] 60. Limiting assembly; 61. Limiting seat; 62. Limiting wheel;

[0034] 200, base; 201, open mounting hole;

[0035] 300, cover plate;

[0036] 1. Multi-station cold heading device;

[0037] 2. Four-split damping spacer rod;

[0038] 3. Bolts;

[0039] 4. Nut. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] like Figures 1 to 4As shown, the utility model provides a cold heading die 100, including a base plate 10, a die module 20, a positioning module 30 and a clamping module 40. The die module 20 is arranged on the base plate 10, and relative displacement can be generated between the two in the radial direction; the positioning module 30 is fixedly connected to the base plate 10, so that the die module 20 can move within a preset radial range relative to the base plate 10; the clamping module 40 is connected to the base plate 10, and the clamping module 40 includes a reset component 41 and a plurality of clamping components 42 for clamping and limiting the die module 20. The plurality of clamping components 42 are spaced apart along the circumferential direction of the positioning module 30 and connected to the reset component 41. The plurality of clamping components 42 are arranged at intervals along the circumferential direction of the positioning module 30 and connected to the reset component 41. Under the action of the positioning component 41, it has a tendency to move inwardly along the radial direction of the positioning module 30 relative to the base plate 10; the cold heading die 100 has at least two states. In the first state, the die module 20 is clamped and limited at the center position of the positioning module 30 by multiple clamping components 42 in the first position; in the second state, the die module 20 is located at a position deviated from the center of the positioning module 30, and at least one clamping component 42 moves to the second position, and the second position is farther away from the center position of the positioning module 30 relative to the first position. The reset component 41 is in a state of accumulating force so that the clamping component 42 in the second position has a tendency to move inwardly along the radial direction of the positioning module 30.

[0042] Specifically, Figure 1 and Figure 2 As shown, the positioning module 30 and the clamping module 40 are both connected to the base plate 10, and the die module 20 is arranged in the inner position area of ​​the circle where the positioning module 30 is located and is in sliding contact with the base plate 10, so that the die module 20 can slide relative to the base plate 10 in the radial direction in the base plate 10 position area within the positioning module 30, that is, the slidable area of ​​the die module 20 relative to the base plate 10 is the area of ​​the circle where the positioning module 30 is located. Among them, the clamping module 40 includes a connected reset component 41 and a plurality of clamping components 42, the reset component 41 is fixedly connected to the base plate 10 through a reset member and is sleeved on the outside of the die module 20 through a connecting member, and the plurality of clamping components 42 are arranged at intervals along the circumferential direction of the positioning module 30 and are slidably connected to the base plate 10, so that the plurality of clamping components 42 can move inward relative to the base plate 10 along the radial direction of the positioning module 30 under the action of the reset component 41, thereby clamping the die module 20 and limiting it at the center position of the positioning module 30. The cold heading die 100 has at least two states, such as Figure 3 As shown, in the first state (i.e., the initial state where the die module 20 is not subjected to external force), the reset assembly 41 is in a natural state, the plurality of clamping assemblies 42 are in a first position close to the center position of the positioning module 30, and the die module 20 is clamped and limited at the center position of the positioning module 30 by the plurality of clamping assemblies 42; Figure 4As shown, in the second state (i.e., the state of movement result of the die module 20 being acted upon by an external force), at least one clamping assembly 42 moves to a second position away from the center of the positioning module 30, the reset assembly 41 is in a force accumulation state, and the die module 20 is located at a position deviating from the center of the positioning module 30. When the die module 20 is acted upon by an external force in a non-axial direction, the die module 20 will move outward relative to the base plate 10 in the radial direction of the circle where the positioning module 30 is located under the action of the external force, so that at least one clamping assembly 42 moves from a first position close to the center of the positioning module 30 to a second position away from the center of the positioning module 30, and the movement of at least one clamping assembly 42 causes the reset assembly 41 to enter a force accumulation state, and the cold heading die 100 enters the second state from the first state; when the die module 20 is acted upon by an external force in a non-axial direction, the die module 20 will move outward relative to the base plate 10 in the radial direction of the circle where the positioning module 30 is located, so that at least one clamping assembly 42 moves from a first position close to the center of the positioning module 30 to a second position away from the center of the positioning module 30, and the movement of at least one clamping assembly 42 causes the reset assembly 41 to enter a force accumulation state, and the cold heading die 100 enters the second state from the first state; when the die module 20 is acted upon by an external force in a non-axial direction When the pressure disappears, the reset component 41 immediately enters the release force state. Under the action of the release force of the reset component 41, the clamping component 42 in the second position begins to move inward along the radial direction of the positioning module 30 to push the die module 20 to move inward relative to the base plate 10 in the radial direction of the circle where the positioning module 30 is located, until the die module 20 is reset to the first position again and the multiple clamping components 42 are clamped and limited at the center position of the positioning module 30. At this time, the reset component 41 returns to its natural state, and the cold heading die 100 enters the first state from the second state.

[0043] Specifically, see Figure 7 As shown, the die module 20 includes a die base 21 and a die 22 connected coaxially, the bottom of the die base 21 radially extends outward to form a positioning base plate 211, the die base 21 is fixedly connected to a limiting plate 50, the head of the die 22 axially extends to form a receiving groove 221, the center of the head of the die 22 axially extends to form a top 222, and the inner wall side of the receiving groove 221 radially extends outward to form a guide rib 223. Specifically, as shown in FIG. Figure 1 and Figure 7As shown, the die module 20 includes a die base 21 and a die 22 coaxially connected to the die base 21. The bottom of the die base 21 extends radially outward to form a positioning base plate 211. The positioning module 30 limits the movable range of the die module 20 relative to the base plate 10 in the radial direction by limiting the positioning base plate 211. A limiting plate 50 is fixedly connected to the die base 21 to axially limit the limiting assembly 60 to prevent the limiting assembly 60 from axial movement, thereby affecting the movement and position retention of the die module 20. The outer periphery of the head of the die 22 extends axially to form an annular protrusion, and a receiving groove 221 is formed inside the annular protrusion. The center of the head of the die 22 extends axially to form a top 222 to accommodate and position the cold-headed parts. The inner wall side of the accommodating groove 221 extends radially outward to form a guide rib 223 to guide the cold-forged workpiece for positioning, thereby realizing rapid and automatic positioning of the cold-forged workpiece.

[0044] Specifically, the positioning module 30 includes a plurality of limiting pressure plates 31, which are connected to the bottom plate 10 at intervals along the circumferential direction of the bottom plate 10, and the limiting pressure plates 31 include an axial limiting portion 311 and a radial limiting portion 312. There is a first distance greater than zero between the axial limiting portion 311 and the positioning bottom plate 211, and there is a second distance not less than zero between the radial limiting portion 312 and the positioning bottom plate 211. Specifically, as Figures 1 to 4 As shown, the positioning module 30 includes a plurality of limiting pressure plates 31 fixedly connected to the bottom plate 10 at intervals along the circumferential direction of the bottom plate 10. The limiting pressure plates 31 are inverted "L" shape, including connected axial limiting portions 311 and radial limiting portions 312. In this way, the limiting pressure plates 31 have the function of limiting the movement of the die module 20 and ensuring safety. After the cold heading of the workpiece is completed, due to the relative extrusion and deformation between the workpiece and the die 22 of the die module 20, the die 22 may be adhered to the workpiece. When unloading, the limiting pressure plates 31 can prevent the die module 20 from being pulled up, thereby avoiding collision between the die module 20 and other parts.

[0045] Among them, the first distance is a fixed distance greater than zero, and the second distance is a floating distance not less than zero. Specifically, along the axial direction of the positioning module 30, the first distance is a fixed distance greater than zero, that is, a gap of the first distance is left between the axial limit portion 311 and the positioning base plate 211 of the die base 21 to prevent the axial limit portion 311 from pressing the die base 21 to death on the base plate 10, causing the die module 20 to be unable to slide relative to the base plate 10 in the radial direction within the circle where the positioning module 30 is located, thereby affecting the rapid automatic positioning of the cold-headed part when the axes do not coincide when the cold-headed part contacts the die module 20. Along the radial direction of the positioning module 30, the second distance is a floating distance not less than zero. When the die module 20 moves outwardly in the radial direction relative to the base plate 10 until the side wall of the positioning base plate 211 of the die base 21 contacts a certain radial limiting portion 312, the second distance between the positioning base plate 211 and the radial limiting portion 312 is zero. The second distance between the positioning base plate 211 and another radial limiting portion 312 radially opposite to the radial limiting portion 312 is the maximum distance that the die module 20 can move relative to the base plate 10 in the radial direction, that is, the positioning module The difference between the diameter of the circle where the block 30 is located and the diameter of the positioning base plate 211. When the cold heading die 100 is in the first state, the axis of the die module 20 coincides with the center of the circle where the positioning module 30 is located, and the distance between the positioning base plate 211 and each radial limit portion 312 is the difference between the radius of the circle where the positioning module 30 is located and the radius of the positioning base plate 211, that is, the second distance can be any value from zero to the difference between the diameter of the circle where the positioning module 30 is located and the diameter of the positioning base plate 211, which is specifically related to the position of the die module 20 in the circle where the positioning module 30 is located.

[0046] Specifically, the clamping assembly 42 includes a guide rail 421, a connection structure having a connecting wheel 422 and a connecting plate 423, and a clamping structure having a clamping wheel 424 and a clamping plate 425. The clamping assembly 42 is slidably connected to the base plate 10 through the guide rail 421, and the clamping assembly 42 is slidably connected to the connecting piece of the reset assembly 41 through the connecting wheel 422. The guide rail 421 is fixedly connected to the connecting plate 423, the connecting wheel 422 and the clamping plate 425 are fixedly connected to the connecting plate 423, and the clamping wheel 424 is fixedly connected to the clamping plate 425. Specifically, as Figures 1 to 4As shown, a guide rail seat 11 is provided on the bottom plate 10, and the clamping assembly 42 is slidably connected to the guide rail seat 11 through a guide rail 421, and is slidably connected to the reset assembly 41 through a connecting wheel 422, and the connecting plate 423 (mounting plate of the connecting wheel 422) and the clamping plate 425 (mounting plate of the clamping wheel 424) are both fixedly connected to the guide rail 421. In this way, when the die module 20 is forced to move so that the clamping wheel 424 in the moving direction of the die module 20 follows the guide rail 421 and moves along the guide rail seat 11 toward the radial outside of the positioning module 30, the connecting wheel 422 in the moving direction of the die module 20 follows the guide rail 421 and slides relative to the connecting piece of the reset assembly 41, thereby driving the connecting piece of the reset assembly 41 to rotate axially, so that the reset piece of the reset assembly 41 is forced to enter a state of accumulated force, and the remaining connecting wheels 422 also slide relative to the connecting piece of the reset assembly 41, driving the rest of the connecting wheels 422 to slide relative to the connecting piece of the reset assembly 41, driving the reset piece of the reset assembly 41 to rotate axially. The remaining clamping wheels 424 also move radially outward from the positioning module 30; when the external force disappears, the reset part of the reset assembly 41 enters a force release state, thereby driving the connecting part of the reset assembly 41 to rotate in the opposite direction, causing each connecting wheel 422 to slide relative to the connecting part of the reset assembly 41, thereby driving each guide rail 421 and the clamping wheels 424 thereon to move radially inward from the positioning module 30 along the guide rail seat 11, causing the die module 20 to return to the center position of the positioning module 30 and be clamped and limited at the center position of the positioning module 30 by multiple clamping wheels 424.

[0047] Specifically, the reset assembly 41 includes a reset tension spring 411, a tension spring stud 412 and a cam slot plate 413. The cam slot plate 413 is sleeved on the outside of the die module 20. One end of the reset tension spring 411 is connected to the cam slot plate 413 through the tension spring stud 412, and the other end of the reset tension spring 411 is connected to the base plate 10 through the tension spring seat 414. The cam slot plate 413 is provided with a plurality of connecting waist grooves 4131 that cooperate with the connecting wheels 422 of the plurality of clamping assemblies 42. Along the circumferential direction of the positioning module 30, the plurality of connecting waist grooves 4131 are arranged one by one with the plurality of clamping assemblies 42. The longitudinal extension direction of the correspondingly arranged connecting waist grooves 4131 and the movement direction of the clamping assembly 42 have an angle greater than zero, and each connecting waist groove 4131 has a certain extension tendency in the radial direction of the cam slot plate 413. Specifically, as Figure 1As shown, the reset assembly 41 includes a cam slot plate 413 sleeved on the outside of the die module 20 and a reset spring 411 connected to the cam slot plate 413 through a tension spring stud 412, the other end of the reset spring 411 is connected to the base plate 10 through a tension spring seat 414, and a plurality of connecting waist grooves 4131 are provided on the cam slot plate 413. Along the circumferential direction of the positioning module 30, the plurality of connecting waist grooves 4131 are arranged one by one with the plurality of clamping assemblies 42, and the connecting wheels 422 of the plurality of clamping assemblies 42 are arranged in the correspondingly arranged connecting waist grooves 4131 and relative sliding can be generated between the two. Among them, there is an angle greater than zero between the longitudinal extension direction of the correspondingly arranged connecting waist grooves 4131 and the movement direction of the clamping assembly 42, and each connecting waist groove 4131 has a certain extension trend in the radial direction of the cam slot plate 413. When the die module 20 is moved under force, the connecting wheel 422 follows the movement of the guide rail 421 and slides toward the end of the connecting waist groove 4131 away from the center of the cam slot plate 413, thereby driving the cam slot plate 413 to rotate axially, so that the reset tension spring 411 is stretched under force to enter the accumulated force state, and the remaining connecting wheels 422 also move away from the connecting waist groove 4131 One end of the center of the cam slot plate 413 slides, thereby driving the remaining clamping wheels 424 to move radially outward of the positioning module 30; when the external force disappears, the reset tension spring 411 contracts and enters a release state, thereby driving the cam slot plate 413 to rotate in the opposite direction, so that each connecting wheel 422 slides toward one end of the connecting waist groove 4131 close to the center of the cam slot plate 413, thereby driving each guide rail 421 and the clamping wheels 424 thereon to move radially inward of the positioning module 30 along the guide rail seat 11, so that the die module 20 is reset and clamped and limited at the center position of the positioning module 30 by multiple clamping wheels 424. In this way, the associated movement of the reset assembly 41 and the clamping assembly 42 is realized through the cooperation of the connecting wheel 422 and the connecting waist groove 4131. That is, the reset tension spring 411 is a reset member fixedly connected to the base plate 10, and the cam slot plate 413 is a connecting member slidably connected to the connecting wheel 422 of the clamping assembly 42. In order to ensure that the elastic restoring performance of the restoring tension spring 411 is in a good state for a long time, the restoring tension spring 411 is horizontally connected between the tension spring stud 412 and the tension spring seat 414 .

[0048] Furthermore, if Figure 1 As shown, the reset assembly 41 also includes a limit plate 50 for axially limiting the cam slot plate 413. The limit plate 50 is sleeved outside the die module 20 and is located above the cam slot plate 413, and the limit plate 50 is fixedly connected to the die module 20. The limit plate 50, which is arranged above the cam slot plate 413 and fixedly connected to the die base 21, limits the limit assembly 60 in the axial direction to prevent the limit assembly 60 from axial movement, thereby ensuring the translation movement and position maintenance between the die module 20 and the base plate 10, and preventing the die module 20 from tipping over due to force.

[0049] Furthermore, the cold heading die 100 further includes a plurality of limiting components 60 for circumferentially limiting the cam slot plate 413. The plurality of limiting components 60 are arranged on the bottom plate 10 at intervals along the circumferential direction of the cam slot plate 413. The cam slot plate 413 is formed with a plurality of limiting grooves 4132 corresponding to the plurality of limiting components 60. Specifically, as Figure 1 and Figure 2 As shown, the cold heading die 100 further includes a plurality of stopper assemblies 60 arranged on the bottom plate 10 at intervals along the circumferential direction of the cam slot plate 413. The cam slot plate 413 is formed with a plurality of stopper grooves 4132 corresponding to the stopper wheels 62 of the plurality of stopper assemblies 60. For ease of assembly, the stopper grooves 4132 are designed to be open. Thus, through the cooperation between the stopper assemblies 60 and the stopper grooves 4132, the cam slot plate 413 can rotate relative to the bottom plate 10 within a preset circumferential range, thereby ensuring that the reset tension spring 411 always performs an extension movement within the yield limit, thereby extending the service life of the reset tension spring 411.

[0050] Specifically, Figure 1 As shown, the limiting assembly 60 includes a limiting seat 61 and a limiting wheel 62. The limiting seat 61 is fixedly connected to the bottom plate 10. The limiting wheel 62 is fixedly connected to the limiting seat 61, and the limiting wheel 62 is arranged in the limiting groove 4132. When the cam slot plate 413 rotates until the limiting wheel 62 contacts the circumferential side wall of the limiting groove 4132, the cam slot plate 413 is stopped by the limiting wheel 62 along the original rotation direction, and the protection of the reset tension spring 411 is achieved by limiting the rotation angle of the cam slot plate 413.

[0051] Related References Figure 5 As shown, the utility model also provides a multi-station cold heading device 1, comprising: a plurality of the above-mentioned cold heading dies 100; a base 200, the plurality of cold heading dies 100 are installed on the base 200 through a bottom plate 10, and the plurality of cold heading dies 100 are arranged one by one corresponding to the plurality of cold heading parts of the product. Specifically, as Figure 5 As shown, the multi-station cold heading device 1 includes a base 200, a plurality of cold heading dies 100 mounted on the base 200, and a cover plate 300 for preventing the cold heading dies 100 from axially moving. The arrangement of the plurality of cold heading dies 100 on the base 200 is consistent with the arrangement of the plurality of cold heading parts of the product to be cold headed. In this way, the cold heading of the plurality of cold heading parts of the product can be achieved through one operation, thereby achieving the purpose of multi-station cold heading. Among them, an open mounting hole 201 adapted to the dovetail groove on the punching machine workbench is provided on the base 200, so that the multi-station cold heading device 1 can be installed on punching machines of different models for use. With the help of a robot for loading and unloading, the automatic stamping of the plurality of cold heading parts of the product can be achieved.

[0052] For example, see Figure 6As shown, when a four-station cold heading device is used to cold head the inner hole of the bolt 3 head of the four-split damping spacer bar 2, the arrangement of the four cold heading dies 100 on the base 200 in the four-station cold heading device is consistent with the arrangement of the four bolts 3 in the four-split damping spacer bar 2, that is, the center of the die module 20 of the four cold heading dies 100 corresponds to the center position of the four bolts 3. Among them, the four-split damping spacer bar 2 is assembled by the upper frame, the spacer bar, the lower frame, the bolts 3, and the nuts 4. Due to the large tolerance of the installation position of each part and the deviation of the opening position of the head of the incoming bolt 3, after the overall assembly of the four-split damping spacer bar 2 is completed, the relative position of the four bolts 3 deviates by ±3mm from the design position, so that the center of the die module 20 of the four cold heading dies 100 cannot completely correspond to the center position of the opening of the head of the four bolts 3. Therefore, in order to ensure that four bolts 3 can be punched simultaneously in one operation and to ensure the axial limiting effect of the limiting pressure plate 31, preferably, the first distance is a fixed distance of 1 mm, and the second distance is a floating distance of 0 to 6 mm, that is, when the cold heading die 100 is in the first state, the second distance is a constant value of 3 mm.

[0053] like Figure 6 and Figure 7As shown, when the four bolts 3 of the four-split damping spacer 2 are pressed down, the edge of the nut 4 on the bolt 3 can move along the guide rib 223 of the die 22 to the receiving groove 221, so that the top 222 of the die 22 can be quickly aligned with the center of the hole in the center of the bolt 3, and fast automatic positioning is achieved. During the pressing process of the four bolts 3, when the center of the bolt 3 is not aligned with the center of the die module 20, the die module 20 will be subjected to the external force in the non-axial direction applied by the bolt 3, and move outward relative to the base plate 10 in the radial direction of the circle where the positioning module 30 is located, and the connecting wheel 422 in the moving direction of the die module 20 moves with the guide rail 421 and slides in the connecting waist groove 4131 of the cam groove plate 413, thereby driving the cam groove plate 413 to rotate axially, so that the reset tension spring 411 is stretched by force and enters the state of accumulated force, and the remaining three connecting wheels 422 also slide in the connecting waist groove 4131 of the cam groove plate 413 The other three clamping wheels 424 also move radially outward of the positioning module 30 until the center of the bolt 3 is aligned with the center of the punching module 20; when the external force disappears, the reset tension spring 411 contracts and resets, and the reset tension spring 411 enters the force release state, thereby driving the cam slot plate 413 to rotate in the opposite direction, so that each connecting wheel 422 slides in the connecting waist groove 4131 of the cam slot plate 413, thereby driving each guide rail 421 and the clamping wheels 424 thereon to move radially inward of the positioning module 30 along the guide rail seat 11, so that the punching module 20 is reset and clamped and limited to the center position of the positioning module 30 by multiple clamping wheels 424. In this way, the position deviation of the four bolts 3 after the four-split damping spacer 2 is compensated by the force movement of the punching module 20, so that the centers of the four punching modules 20 correspond to the centers of the four bolts 3 of the four-split damping spacer 2.

[0054] The utility model also provides a cold heading machine, comprising the above-mentioned multi-station cold heading device 1 and a punch press for installing the multi-station cold heading device 1. Specifically, the multi-station cold heading device 1 is connected to the workbench of the punch press through a base 200, and the multi-station cold heading device 1 and the punch press can be quickly disassembled and assembled through the open mounting hole 201 on the base 200 and the dovetail groove on the workbench.

[0055] Based on the above description, the cold heading die 100, the multi-station cold heading device 1 and the cold heading machine provided by the embodiment of the utility model have the following beneficial effects:

[0056] The cold heading die 100 provided in the embodiment of the utility model is provided with the above-mentioned die module 20, positioning module 30 and clamping module 40, so that the die module 20 can move within a preset radial range relative to the base plate 10 after being subjected to force, so that the center of the cold heading piece and the center of the die module 20 can be automatically aligned when the cold heading piece is eccentrically pressed down, and the die module 20 can be automatically reset to the initial position after the cold heading is completed; the multi-station cold heading device 1 and cold heading machine provided in the embodiment of the utility model achieve the purpose of multi-station cold heading in one operation by arranging and setting multiple cold heading dies 100 and multiple cold heading pieces of the product in a one-to-one correspondence, and have the advantages of high production efficiency, good product quality, low production cost and high safety.

[0057] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A cold heading die, characterized in that: It comprises a base plate, a die module, a positioning module and a clamping module, wherein the die module is arranged on the base plate, and relative displacement can be generated between the two in the radial direction; the positioning module is fixedly connected to the base plate, so that the die module can move within a preset radial range relative to the base plate; the clamping module is connected to the base plate, and the clamping module comprises a reset component and a plurality of clamping components for clamping and limiting the die module, a plurality of the clamping components are arranged at intervals along the circumferential direction of the positioning module and are connected to the reset component, and the plurality of the clamping components have a tendency to move inwardly relative to the base plate along the radial direction of the positioning module under the action of the reset component; The cold heading die has at least two states. In the first state, the die module is clamped and limited at the center position of the positioning module by multiple clamping assemblies in the first position; in the second state, the die module is located at a position deviated from the center position of the positioning module, and at least one of the clamping assemblies moves to a second position, which is farther away from the center position of the positioning module relative to the first position, and the reset assembly is in a state of accumulating force so that the clamping assembly in the second position has a tendency to move inward in the radial direction of the positioning module.

2. The cold heading die according to claim 1, characterized in that: The clamping assembly includes a guide rail, a connecting structure with a connecting wheel and a connecting plate, and a clamping structure with a clamping wheel and a clamping plate. The clamping assembly is slidably connected to the base plate via the guide rail, and the clamping assembly is slidably connected to the reset assembly via the connecting wheel. The connecting plate is fixedly connected to the guide rail, the connecting wheel and the clamping plate are fixedly connected to the connecting plate, and the clamping wheel is fixedly connected to the clamping plate.

3. The cold heading die according to claim 2, characterized in that: The reset assembly includes a reset spring, a spring stud and a cam slot plate, the cam slot plate is sleeved on the outside of the die module, one end of the reset spring is connected to the cam slot plate through the spring stud, and the other end of the reset spring is connected to the base plate through the spring seat; the cam slot plate is provided with a plurality of connecting waist grooves that cooperate with the connecting wheels of the plurality of clamping assemblies, and along the circumferential direction of the positioning module, the plurality of connecting waist grooves and the plurality of clamping assemblies are arranged one by one, and the longitudinal extension direction of the correspondingly arranged connecting waist grooves and the movement direction of the clamping assembly have an angle greater than zero, and each of the connecting waist grooves has a certain extension tendency in the radial direction of the cam slot plate.

4. The cold heading die according to claim 3, characterized in that: The reset assembly also includes a limit plate for axially limiting the cam slot plate. The limit plate is sleeved outside the die module and is located above the cam slot plate. The limit plate is fixedly connected to the die module.

5. The cold heading die according to claim 4, characterized in that: The cold heading die also includes a plurality of limit assemblies for circumferentially limiting the cam slot plate. The plurality of limit assemblies are arranged on the base plate at intervals along the circumferential direction of the cam slot plate. The cam slot plate is formed with a plurality of limit grooves corresponding to the plurality of limit assemblies.

6. The cold heading die according to claim 5, characterized in that: The limiting assembly comprises a limiting seat and a limiting wheel. The limiting seat is fixedly connected to the bottom plate. The limiting seat is fixedly connected to the limiting wheel, and the limiting wheel is arranged in the limiting groove.

7. The cold heading die according to claim 4, characterized in that: The die module includes a coaxially connected die base and a die, the bottom of the die base radially extends outward to form a positioning base plate, the limit plate is fixedly connected to the die base, the outer periphery of the die head is axially extended to form a receiving groove, the center of the die head is axially extended to form a top, and the inner wall side of the receiving groove radially extends outward to form a guide rib.

8. The cold heading die according to claim 7, characterized in that: The positioning module includes a plurality of limiting pressure plates, which are connected to the base plate at intervals along the circumferential direction of the base plate. The limiting pressure plates include an axial limiting portion and a radial limiting portion. A first distance greater than zero is provided between the axial limiting portion and the positioning base plate, and a second distance not less than zero is provided between the radial limiting portion and the positioning base plate.

9. A multi-station cold heading device, characterized in that: include: A plurality of cold heading dies according to any one of claims 1 to 8; A base, a plurality of the cold heading dies are installed on the base through the bottom plate, and the plurality of the cold heading dies are arranged in one-to-one correspondence with a plurality of the product parts to be cold headed.

10. A cold heading machine, characterized in that: It comprises the multi-station cold heading device as claimed in claim 9 and a punch press for installing the multi-station cold heading device.

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