CN116174641A - Bolt cold heading device and application method thereof - Google Patents
Bolt cold heading device and application method thereof Download PDFInfo
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- CN116174641A CN116174641A CN202310228950.9A CN202310228950A CN116174641A CN 116174641 A CN116174641 A CN 116174641A CN 202310228950 A CN202310228950 A CN 202310228950A CN 116174641 A CN116174641 A CN 116174641A
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- cold heading
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005452 bending Methods 0.000 claims description 34
- 238000003860 storage Methods 0.000 claims description 30
- 230000002265 prevention Effects 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 13
- 239000007788 liquid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Forging (AREA)
Abstract
The invention relates to the technical field of cold heading devices, and particularly provides a bolt cold heading device and a using method thereof, wherein the bolt cold heading device comprises a female die, the female die is arranged in a stamping area of a cold header, and a die cavity for accommodating a bolt is formed in the female die; the male die is arranged in the stamping area of the cold header, the working surface of the male die is opposite to the working surface of the female die, and the male die can be close to or far away from the female die to perform cold header on a bolt workpiece in the die cavity; the ejector rod is arranged in the die cavity and can slide back and forth in the die cavity for a set distance; the limiting sleeve is sleeved on the side wall of the ejector rod, and can be pushed by the ejector rod.
Description
Technical Field
The invention relates to the field of cold heading devices, in particular to a bolt cold heading device and a using method thereof.
Background
The cold heading process is one of the new processes of few and no cutting metal pressure processing. The plastic deformation of metal under the action of external force is used to redistribute and transfer the volume of metal by means of mould, so forming needed parts or blanks. The cold heading process is most suitable for producing standard fasteners such as bolts, screws, nuts, rivets, pins and the like. The common equipment used in the cold heading process is a special cold heading machine. If the throughput is not too great, it is also possible to replace it with a crank press or a friction press. In the whole cold heading process, the most important device is a cold heading die.
For example, chinese patent document with application number of cn202222344081.X discloses a cold header die, which can guide gas between the scrap and the lower processing surface through a set gas guiding stripping member, and blow the scrap by means of the gas, so as to accelerate the scrap to fall off from the lower processing surface, and ensure that the cold header die normally processes subsequent workpieces.
Also, chinese patent document CN202121529252.5 discloses a cold header for bolt production, which is fixedly connected with a connecting plate at the side of a sleeve ring, a sliding block provided at the corresponding positions of the top and the bottom of the sliding plate is slidably connected at the inner side of a sliding groove, and the left side surface of the sliding block resists against the tail end of a thrust spring, so that the inner side of a screw head is clamped at the side of a push rod in the processing process, the outer side of the screw head is movably connected at the inner side of a sleeve hole, and the sliding plate is pushed after being unfolded by the thrust spring in the taking out process, so that the sliding plate drives the screw head to leave the push rod, thereby solving the problem that the screw head is easy to be clamped at the side of the push rod.
The above patent document aims at the problems that the scrap is clean and the workpiece is clamped in the cold heading process of the bolt piece, but a part which cannot be ignored in the cold heading process is also provided with a die, the workpiece is required to be pressed into the die in the cold heading forming process, the product is required to be ejected through the ejector rod after the processing of the workpiece is completed, but for some slender products, the ejector rod is relatively large in resistance, plastic bending is easy to occur in the process of ejecting the product, particularly in the case that the outer wall of the product is tightly attached to the die cavity of the die, the ejector rod needs to enter the die cavity at the moment to push the product to gradually slide out of the die cavity, but because the ejector rod is relatively thin and enters the die cavity, the ejector rod pushing the product can be relatively pushed in the die cavity because the inner wall of the die cavity cannot support the side wall of the ejector rod, so that the bending probability is further increased.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problem that the ejector rod pushing the product receives larger thrust in the die cavity because the inner wall of the die cavity cannot support the side wall of the ejector rod, the ejector rod is bent, the invention provides a bolt cold heading device and a using method thereof, and aims to solve the problem.
The technical scheme adopted for solving the technical problems is as follows: the cold heading device for the bolts comprises a female die, wherein the female die is arranged in a stamping area of a cold header, and a die cavity for accommodating the bolts is formed in the female die;
the male die is arranged in the stamping area of the cold header, the working surface of the male die is opposite to the working surface of the female die, and the male die can be close to or far away from the female die to perform cold header on a bolt workpiece in the die cavity;
the ejector rod is arranged in the die cavity and can slide back and forth in the die cavity for a set distance;
the limiting sleeve is sleeved on the side wall of the ejector rod and can be pushed by the ejector rod;
when the ejector rod pushes the bolt workpiece subjected to cold heading to slide out of the die cavity, the limiting sleeve slides along the ejector rod and limits the side wall of the ejector rod.
Preferably, the side wall of the ejector rod is detachably connected with a pushing strip;
the limiting sleeve comprises a bending prevention barrel which is sleeved on the side wall of the ejector rod in a sliding manner, a sliding groove is formed in the position, corresponding to the pushing strip, of the side wall of the bending prevention barrel, a supporting barrel is arranged at one end, close to the die cavity, of the bending prevention barrel, and the surface of the supporting barrel is flush with the surface of one end, close to the die cavity, of the ejector rod; when the ejector rod slides, the pushing strip slides to a certain position along the sliding groove and then pushes the bending prevention cylinder to slide along the inner wall of the die cavity.
Preferably, the female die comprises a die holder arranged in a stamping area of the cold header, a die core fixing block arranged in the die holder, and a die core I and a die core II which are arranged in the die core fixing block and are sequentially arranged according to the cold heading direction of the bolt, wherein the die cavity is arranged at the axle centers of the die core I and the die core II, one side, far away from the male die, of the die holder is detachably connected with a fixing plate, one side, far away from the die holder, of the fixing plate is provided with a connecting plate, and the ejector rod and the limiting sleeve penetrate through the fixing plate and the connecting plate and extend into the die cavity;
the fixing plate is provided with a stepped hole at the position corresponding to the die cavity on one side surface far away from the die holder, and a supporting seat sleeved on the side wall of the limiting sleeve is arranged in the stepped hole.
Preferably, when the ejector rod does not slide, the supporting seat can support one end of the limiting sleeve, which is close to the male die;
the diameter of one end of the limiting sleeve, which is close to the male die, is equal to the inner diameter of one end of the die cavity, which is close to the fixed plate.
Preferably, the side wall of the second die core is provided with a plurality of guide posts, a joint of the second die core and the inner wall of the die core fixing block is provided with a clamping groove matched with each guide post, and the second die core can be limited by the guide posts.
Preferably, an oil storage channel is arranged in the fixed plate, oil liquid sliding by the guide bolt is filled in the oil storage channel, an oil injection column penetrating the oil storage channel and extending into the guide column is arranged in the oil storage channel, and a plurality of air channels are formed in the inner wall of the oil storage channel;
the supporting seat is provided with a plurality of air guide ports on one end surface close to the male die, each air guide port is arranged in one-to-one correspondence with each air passage, when the limiting sleeve slides towards one side far away from the male die, the limiting sleeve guides air to enter the air passages so as to push oil to enter the oil injection column, and the guide column can also spray fluid towards the two inner side walls of the die core.
Preferably, the surface of the second mold core is provided with a plurality of guide runners, each guide runner and each guide post are arranged in a one-to-one correspondence mode, and the guide runners can guide oil to enter the inner side wall of the second mold core.
Preferably, the distance between the bottom end of the oil injection column and the inner wall of the bottom of the oil storage channel is smaller than the distance between the air channel and the inner wall of the bottom of the oil storage channel.
The application method of the bolt cold heading device comprises the following steps of;
s1, guiding a male die and a female die to be matched to perform cold heading on a bolt workpiece in a die cavity;
s2, the male die is separated, and simultaneously, a bolt workpiece subjected to cold heading is pushed by the ejector rod to slide along the inner wall of the die cavity;
s3, driving the limiting sleeve to slide along the die cavity together through the sliding ejector rod, and enabling the bolt workpiece to be separated from the die cavity after the limiting sleeve slides for a set distance;
s4, driving the ejector rod to reset.
The invention has the beneficial effects that the supporting operation of the side wall of the ejector rod can be realized by limiting the sleeve, so that the bending force at the center point of the ejector rod can be counteracted by the self resistance force from the bending prevention cylinder and the supporting force from the supporting cylinder and the inner wall of the die cavity, thereby reducing the bending probability of the ejector rod,
meanwhile, the invention also sprays fluid towards the gap between the second die core and the first die core through the guide post, so that the fluid flows into the inner side wall of the second die core along the guide flow channel to reduce the friction force between the die cavity and the bolt workpiece, and the probability of pushing and bending the ejector rod is further reduced.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic view of a female mold and a male mold in the present invention when they are not closed;
FIG. 2 is a schematic diagram of a prior art female mold and male mold when installed;
FIG. 3 is a prior art bolt work processing flow diagram;
FIG. 4 is a schematic view of a die core fixing block according to the present invention;
FIG. 5 is a schematic cross-sectional view of a mold core according to the present invention;
FIG. 6 is a schematic cross-sectional view of a support base according to the present invention;
fig. 7 is a schematic view of a guide flow path structure in the present invention.
Reference numerals: 1. a master mold; 2. a male mold; 3. a mold cavity; 4. a push rod; 5. a restraining sleeve; 6. pushing the strip; 7. a bending prevention cylinder; 8. a sliding groove; 9. a support cylinder; 10. a die holder; 11. a first mold core; 12. a second mold core; 13. a die core fixing block; 14. a fixing plate; 15. a connecting plate; 16. a stepped hole; 17. a support base; 18. a guide post; 19. a clamping groove; 20. an oil storage passage; 21. an oil injection column; 22. an airway; 23. an air guide port; 24. and guiding the flow channel.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1 to 7, the invention provides an embodiment of a bolt cold heading device and a using method thereof.
Specifically, the bolt cold heading device comprises a female die 1, wherein the female die 1 is arranged in a stamping area of a cold heading machine, and a die cavity 3 for accommodating a bolt is formed in the female die 1; the male die 2 is arranged in the stamping area of the cold header, the working surface of the male die 2 is opposite to the working surface of the female die 1, and the male die 2 can be close to or far away from the female die 1 to perform cold header on a bolt workpiece in the die cavity 3; the ejector rod 4 is arranged in the die cavity 3, and the ejector rod 4 can slide back and forth in the die cavity 3 for a set distance; the limiting sleeve 5 is sleeved on the side wall of the ejector rod 4, and the limiting sleeve 5 can be pushed by the ejector rod 4; when the ejector rod 4 pushes the bolt workpiece subjected to cold heading to slide out of the die cavity 3, the limiting sleeve 5 slides along the ejector rod 4 and limits the side wall of the ejector rod 4.
In the prior art, the specific installation of the cold heading die can refer to the position indicated by P in fig. 2, and since the specific object of the present invention is the inside of the die, the installation of the die body, that is, the installation of the female die 1 and the male die 2 and the ejector pin 4, can be performed in the existing operation manner, which is not described in detail herein.
According to the invention, the supporting operation of the side wall of the ejector rod 4 can be realized through the limiting sleeve 5, in the concrete implementation, the female die 1 and the male die 2 are fixed in the stamping area of the cold header, then the bolt workpiece is placed in the die cavity 3, the male die 2 is guided to be close to the female die 1 so as to carry out cold heading on the bolt workpiece in the die cavity 3, then the male die 2 is guided to be far away from the female die 1, so that cold heading on the bolt workpiece is completed, the ejector rod 4 pushes the bolt workpiece which completes cold heading to slide out of the die cavity 3, in the sliding process of the ejector rod 4, the limiting sleeve 5 slides along the ejector rod 4 and limits the side wall of the ejector rod 4, namely, the limiting sleeve 5 is wrapped on the side wall of the ejector rod 4, and due to the existence of the limiting sleeve 5, once the side wall of the ejector rod 4 has a bending trend after the end of the ejector rod 4 is pressed, the limiting sleeve 5 is restrained, so that the bending trend of the side wall of the ejector rod 4 is restrained.
Specifically, the structure of the bolt in the cold heading die in the prior art is shown in fig. 3, and the state diagram of the bolt workpiece when the bolt workpiece is inserted into the die cavity 3, the state diagram of the bolt workpiece after the cold heading is completed, and the state diagram of the bolt workpiece when the bolt workpiece is pushed out of the die cavity 3 are respectively from left to right.
Since some bolts have too large lengths, the installation of the restriction sleeve 5 having the same length as the ejector pin 4 is not easy, and therefore, it is preferable to limit the center area of the ejector pin 4 by the restriction sleeve 5: the side wall of the ejector rod 4 is detachably connected with a pushing strip 6;
the limiting sleeve 5 comprises a bending prevention barrel 7 which is sleeved on the side wall of the ejector rod 4 in a sliding manner, a sliding groove 8 is formed in the position, corresponding to the pushing strip 6, of the side wall of the bending prevention barrel 7, a supporting barrel 9 is arranged at one end, close to the die cavity 3, of the bending prevention barrel 7, and the surface of the supporting barrel 9 is flush with the surface of one end, close to the die cavity 3, of the ejector rod 4; when the ejector rod 4 slides, the pushing strip 6 slides to a certain position along the sliding groove 8 and then pushes the bending prevention cylinder 7 to slide along the inner wall of the die cavity 3.
When the ejector rod 4 slides, the sliding ejector rod 4 slides along the sliding groove 8 with the pushing strip 6, and once the pushing strip 6 slides to a certain position along the sliding groove 8, the bending prevention cylinder 7 and the supporting cylinder 9 are pushed to slide along the inner wall of the die cavity 3 together.
In the invention, when the push rod 4 slides to push the bending prevention barrel 7, the supporting barrel 9 is at least located beyond the central area of the push rod 4, and when the push rod 4 has bending trend, the bending position usually occurs at the central point, so that the bending force at the central point of the push rod 4 can be greatly counteracted through the cooperation of the bending prevention barrel 7 and the supporting barrel 9.
The bending force at the centre point of the ejector pin 4 will be counteracted by the resistance force from the bending prevention cylinder 7 itself and also by the supporting force from the supporting cylinder 9 and the inner wall of the mould cavity 3.
In order to prevent the supporting cylinder 9 from being crushed when the bolt workpiece is cold-headed, it is preferable that the female die 1 comprises a die holder 10 arranged in a stamping area of the cold header, a die core fixing block 13 arranged in the die holder 10, and a die core I11 and a die core II 12 which are arranged in the die core fixing block 13 and are sequentially arranged according to the cold-headed direction of the bolt, the die cavity 3 is arranged at the axle center of the die core I11 and the die core II 12, one side of the die holder 10 away from the male die 2 is detachably connected with a fixing plate 14, one side of the fixing plate 14 away from the die holder 10 is provided with a connecting plate 15, and the ejector rod 4 and the limiting sleeve 5 penetrate through the fixing plate 14 and the connecting plate 15 and extend into the die cavity 3;
a stepped hole 16 is formed in the position, corresponding to the die cavity 3, of one side surface of the fixing plate 14, which is far away from the die holder 10, and a supporting seat 17 sleeved on the side wall of the limiting sleeve 5 is arranged in the stepped hole 16. When the ejector rod 4 does not slide, the supporting seat 17 can hold one end of the limiting sleeve 5 close to the male die 2.
When the cold heading die is required to be used, the female die is assembled as shown in fig. 5, and then, when the cold heading die is used, the supporting seat 17 can hold one end of the limiting sleeve 5 close to the male die 2, that is, the supporting seat 17 can hold the supporting cylinder 9, and when the bolt workpiece is cold headed, the pressure from the bolt workpiece can be applied to the supporting seat 17 instead of being born by the supporting cylinder 9, so that the supporting cylinder 9 is prevented from being crushed.
The diameter of the end of the limiting sleeve 5 near the male die 2 is equal to the inner diameter of the end of the die cavity 3 near the fixed plate 14, which is arranged so that the end of the limiting sleeve 5 near the male die 2 can be fully contacted with the inner wall of the die cavity 3,
because the second mold core 12 is detachable, each part of the master mold 1 is replaceable, but the parts of the second mold core 12 are easy to be dislocated or swayed during assembly or use, so that the second mold core 12 is preferably not dislocated or swayed during assembly or use: the lateral wall of mold core two 12 is provided with a plurality of guide posts 18, and the inner wall laminating department of mold core two 12 and mold core fixed block 13 is provided with the screens groove 19 that matches with every guide post 18, and guide post 18 can carry out spacing to mold core two 12.
The matching of the guide post 18 and the clamping groove 19 can quickly play a role in limiting the second die core 12, so that the second die core 12 is quick and efficient in assembly, namely, the second die core is assembled in a plugging manner, and meanwhile, a cavity can be formed in the guide post 18, so that the subsequent oil injection post 21 is convenient to insert.
In order to enable the bolt work to be pushed out more easily when pushed out by the ejector pin 4 without exerting a large resistance to the ejector pin 4, it is preferable that: the fixed plate 14 is internally provided with an oil storage duct 20, oil liquid sliding by a guide bolt is filled in the oil storage duct 20, the oil storage duct 20 is internally provided with an oil injection column 21 penetrating the oil storage duct 20 and extending into the guide column 18, and the inner wall of the oil storage duct 20 is provided with a plurality of air passages 22;
the support seat 17 is close to one end surface of the male die 2 and is provided with a plurality of air guide ports 23, each air guide port 23 and each air passage 22 are respectively arranged in a one-to-one correspondence mode, when the limiting sleeve 5 slides towards one side far away from the male die 2, the limiting sleeve 5 guides air to enter the air passages 22 so as to push oil to enter the oil injection column 21, and the guide column 18 can also spray fluid towards the inner side wall of the second die core 12.
After the bolt workpiece is pushed out, in order to facilitate the next processing, the ejector rod 4 can be quickly reset, so when the ejector rod 4 is reset, the limiting sleeve 5 is also reset by the ejector rod 4, that is, when the supporting cylinder 9 slides towards the side far away from the male die 2, the supporting cylinder 9 can push the air flow to quickly move towards the air guide port 23 side, so that the air flow gradually enters the oil storage duct 20 along the air passage 22, once the supporting cylinder 9 contacts the supporting seat 17, the air flow quickly enters the oil storage duct 20, and after the air flow enters the oil storage duct 20, the air can push the oil to enter the oil injection column 21 (because the air flow enters the oil injection column 21 at a high speed, the oil is pushed again), the oil entering the oil injection column 21 directly impacts the top end of the guide column 18 along the oil injection column 21, and then the air flow is sprayed into the inner side walls of the two cores 12 through the gaps between the guide column 18 and the first cores 11.
The size of the air guide opening 23 is not too large to prevent the support seat 17 from being affected, and the operation of sliding the air jet of the support cylinder 9 can refer to the injector in the prior art, and the fast sliding injector piston can push the air to flow fast.
In the present invention, the oil may be connected to the oil storage passage 20 through an external pipe, or the oil may be injected into the oil storage passage 20 at regular intervals.
In order to make the oil liquid contact with the inner wall of the second mold core 12 more uniformly, it is preferable that: the surface of the mold core II 12 is provided with a plurality of guide flow passages 24, each guide flow passage 24 and each guide column 18 are respectively arranged in one-to-one correspondence, and the guide flow passages 24 can guide oil to enter the inner side wall of the mold core II 12.
The guide flow passage 24 can ensure that the oil liquid can not be blocked when flowing into the inner side wall of the mold core two 12 along the guide flow passage 24 when the guide column 18 sprays the fluid towards the gap between the mold core two 12 and the mold core one 11, and meanwhile, the guide flow passage 24 can ensure that the oil liquid can be contacted with the inner wall of the mold core two 12 more uniformly instead of being gathered at one place.
In order that the oil can be easily injected into the oil injection column 21, it is preferable that: the space between the bottom end of the oil injection column 21 and the bottom inner wall of the oil storage passage 20 is smaller than the space between the air passage 22 and the bottom inner wall of the oil storage passage 20.
This is so arranged that the liquid can be pushed into the oil column 21 sufficiently by the gas without the gas entering the oil column 21.
In order to solve the problems in the background technology, the invention also provides a using method of the bolt cold heading device, which comprises the following steps of;
s1, guiding a male die 2 and a female die 1 to be matched to perform cold heading on a bolt workpiece in a die cavity 3;
s2, the male die 2 is separated, and simultaneously, a bolt workpiece subjected to cold heading is pushed to slide along the inner wall of the die cavity 3 through the ejector rod 4;
s3, driving the limiting sleeve 5 to slide along the die cavity 3 together through the sliding ejector rod 4, and enabling the bolt workpiece to be separated from the die cavity 3 after a set sliding distance;
s4, driving the ejector rod 4 to reset.
Specifically, when the cold heading machine is used, the female die 1 and the male die 2 are fixed in a stamping area of a cold heading machine, then a bolt workpiece is placed in the die cavity 3, the male die 2 is guided to be close to the female die 1 to cold-heading the bolt workpiece in the die cavity 3, and then the male die 2 is guided to be far away from the female die 1, so that cold heading of the bolt workpiece is completed.
After that, the bolt workpiece subjected to cold heading is pushed to slide out of the die cavity 3 through the ejector rod 4, specifically, when the ejector rod 4 slides, the sliding ejector rod 4 slides along the sliding groove 8 with the pushing strip 6, and once the pushing strip 6 slides to a certain position along the sliding groove 8, the bending prevention cylinder 7 and the supporting cylinder 9 are pushed to slide along the inner wall of the die cavity 3 together. Until the bolt work is pushed out of the die cavity 3.
After the bolt workpiece is pushed out, in order to facilitate the next processing, the ejector rod 4 can be quickly reset, so when the ejector rod 4 is reset, the limiting sleeve 5 is also reset by the ejector rod 4, that is, when the supporting cylinder 9 slides towards the side far away from the male die 2, the supporting cylinder 9 can push the air flow to quickly move towards the air guide port 23 side, so that the air flow gradually enters the oil storage channel 20 along the air passage 22, once the supporting cylinder 9 contacts the supporting seat 17, the air flow quickly enters the oil storage channel 20, after the air flow enters the oil storage channel 20, the air can push the oil to enter the oil injection column 21 (because the speed of the air flow is higher, the oil is accelerated when being pushed again), and the oil entering the oil injection column 21 directly impacts the top end of the guide column 18 along the oil injection column 21, and then the air flow is sprayed into the inner side walls of the two guide channels 12 along the guide column 18 towards the gaps between the two cores 12 and the first core 11, so that the fluid flows enter the two inner side walls of the guide channels 24.
After that, when the next bolt is pushed out, the oil can play a role of lubrication, so that the bolt workpiece can be pushed out quickly, namely, the phenomenon that the ejector rod 4 is pushed to bend is reduced by reducing the pressure of the bolt workpiece to the ejector rod 4 (the pressure is the friction force between the die cavity 3 and the bolt workpiece).
Compared with the prior art, the invention has the following improvement points:
the invention can realize the supporting operation of the side wall of the ejector rod 4 by limiting the sleeve 5, so that the bending force at the center point of the ejector rod 4 can be counteracted by the self resistance force from the bending prevention cylinder 7 and the supporting force from the supporting cylinder 9 and the inner wall of the die cavity 3, thereby reducing the bending probability of the ejector rod 4,
meanwhile, the invention also sprays fluid into the gap between the mold core two 12 and the mold core one 11 through the guide post 18, so that the fluid flows into the inner side wall of the mold core two 12 along the guide runner 24 to reduce the friction force between the mold cavity 3 and the bolt workpiece, and the probability of pushing and bending the ejector rod 4 is further reduced.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (9)
1. The cold heading device for the bolts is characterized by comprising a female die (1), wherein the female die (1) is arranged in a stamping area of a cold heading machine, and a die cavity (3) for accommodating the bolts is formed in the female die (1);
the male die (2) is arranged in a stamping area of the cold header, the working surface of the male die (2) is opposite to the working surface of the female die (1), and the male die (2) can be close to or far away from the female die (1) to perform cold header on a bolt workpiece in the die cavity (3);
the ejector rod (4) is arranged in the die cavity (3), and the ejector rod (4) can slide back and forth in the die cavity (3) for a set distance;
the limiting sleeve (5) is sleeved on the side wall of the ejector rod (4), and the limiting sleeve (5) can be pushed by the ejector rod (4);
when the ejector rod (4) pushes the bolt workpiece subjected to cold heading to slide out of the die cavity (3), the limiting sleeve (5) slides along the ejector rod (4) and limits the side wall of the ejector rod (4).
2. The bolt cold heading device as defined in claim 1, wherein: the side wall of the ejector rod (4) is detachably connected with a pushing strip (6);
the limiting sleeve (5) comprises a bending prevention cylinder (7) which is sleeved on the side wall of the ejector rod (4) in a sliding manner, a sliding groove (8) is formed in the position, corresponding to the pushing strip (6), of the side wall of the bending prevention cylinder (7), a supporting cylinder (9) is arranged at one end, close to the die cavity (3), of the bending prevention cylinder (7), and the surface of the supporting cylinder (9) is flush with the surface of one end, close to the die cavity (3), of the ejector rod (4); when the ejector rod (4) slides, the pushing strip (6) slides to a certain position along the sliding groove (8) and then pushes the bending prevention cylinder (7) to slide along the inner wall of the die cavity (3).
3. A bolt cold heading device according to claim 1 or 2, characterised in that: the female die (1) comprises a die holder (10) arranged in a stamping area of the cold header, a die core fixing block (13) arranged in the die holder (10), and a die core I (11) and a die core II (12) which are arranged in the die core fixing block (13) in sequence according to the cold heading direction of a bolt, wherein the die cavity (3) is arranged at the axle center of the die core I (11) and the die core II (12), one side, far away from the male die (2), of the die holder (10) is detachably connected with a fixing plate (14), one side, far away from the die holder (10), of the fixing plate (14) is provided with a connecting plate (15), and the ejector rod (4) and the limiting sleeve (5) penetrate through the fixing plate (14) and the connecting plate (15) and extend into the die cavity (3);
a stepped hole (16) is formed in the position, corresponding to the die cavity (3), of one side surface, far away from the die holder (10), of the fixing plate (14), and a supporting seat (17) sleeved on the side wall of the limiting sleeve (5) is arranged in the stepped hole (16).
4. A bolt cold heading device according to claim 3, characterized in that: when the ejector rod (4) does not slide, the supporting seat (17) can hold one end, close to the male die (2), of the limiting sleeve (5);
the diameter of the limiting sleeve (5) close to one end of the male die (2) is equal to the inner diameter of one end of the die cavity (3) close to the fixed plate (14).
5. A bolt cold heading device according to claim 3, characterized in that: the side wall of mold core two (12) is provided with a plurality of guide posts (18), the inner wall laminating department of mold core two (12) and mold core fixed block (13) is provided with clamping groove (19) that all match with every guide post (18), guide post (18) can carry out spacingly to mold core two (12).
6. The bolt cold heading device as defined in claim 5, wherein: an oil storage passage (20) is formed in the fixed plate (14), oil sliding by a guide bolt is filled in the oil storage passage (20), an oil injection column (21) penetrating through the oil storage passage (20) and extending into the guide column (18) is arranged in the oil storage passage (20), and a plurality of air passages (22) are formed in the inner wall of the oil storage passage (20);
a plurality of air guide ports (23) are formed in the surface, close to one end of the male die (2), of the supporting seat (17), each air guide port (23) is arranged in one-to-one correspondence with each air passage (22), when the limiting sleeve (5) slides towards one side away from the male die (2), the limiting sleeve (5) guides air to enter the air passages (22) to push oil to enter the oil injection column (21), and the guide column (18) can also spray fluid towards the inner side wall of the second die core (12).
7. The bolt cold heading device as defined in claim 6, wherein: a plurality of guide flow passages (24) are formed in the surface of the mold core II (12), each guide flow passage (24) and each guide post (18) are arranged in a one-to-one correspondence mode, and the guide flow passages (24) can guide oil to enter the inner side wall of the mold core II (12).
8. The bolt cold heading device as defined in claim 6, wherein: the space between the bottom end of the oiling column (21) and the inner wall at the bottom of the oil storage passage (20) is smaller than the space between the air passage (22) and the inner wall at the bottom of the oil storage passage (20).
9. A method of using the bolt cold heading device according to any one of claims 1 to 8 characterised in that: comprises the following steps of;
s1, guiding a male die (2) and a female die (1) to be matched to perform cold heading on a bolt workpiece in a die cavity (3);
s2, the male die (2) is separated, and simultaneously, the bolt workpiece subjected to cold heading is pushed to slide along the inner wall of the die cavity (3) through the ejector rod (4);
s3, driving the limiting sleeve (5) to slide along the die cavity (3) together through the sliding ejector rod (4), and enabling the bolt workpiece to be separated from the die cavity (3) after a set sliding distance is reserved;
s4, driving the ejector rod (4) to reset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310228950.9A CN116174641B (en) | 2023-03-10 | 2023-03-10 | Bolt cold heading device and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310228950.9A CN116174641B (en) | 2023-03-10 | 2023-03-10 | Bolt cold heading device and application method thereof |
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| CN116174641A true CN116174641A (en) | 2023-05-30 |
| CN116174641B CN116174641B (en) | 2024-06-28 |
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|---|---|
| CN116174641B (en) | 2024-06-28 |
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