CN212495131U - Durable double-impact cold heading process female die - Google Patents
Durable double-impact cold heading process female die Download PDFInfo
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- CN212495131U CN212495131U CN202021080988.4U CN202021080988U CN212495131U CN 212495131 U CN212495131 U CN 212495131U CN 202021080988 U CN202021080988 U CN 202021080988U CN 212495131 U CN212495131 U CN 212495131U
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Abstract
The utility model discloses a durable double-impact cold heading process die, which comprises an integrated primary heading die and an integrated final heading die, and a final heading bolt is obtained through the integrated final heading die; the integral primary upsetting female die comprises a primary upsetting female die core and a primary upsetting die sleeve fixedly sleeved on the periphery of the primary upsetting female die core, wherein a primary upsetting extrusion stroke which is in extrusion fit with an external male die punch is arranged in a die cavity of the primary upsetting female die core and is used for performing primary upsetting and reducing on a bolt blank to obtain a primary upsetting bolt; the integral final upsetting female die comprises a square neck female die and a reducing female die, the square neck female die is used for performing square neck final upsetting on the initial upsetting bolt, the reducing female die and the square neck female die are integrally formed, and the extrusion stroke of the initial upsetting is smaller than the length of the square neck female die; the utility model discloses can realize the high efficiency cold-heading shaping to the square neck bolt, avoid the square neck die position to take place cracked problem moreover, do not need the maintenance process of frequent dismouting simultaneously.
Description
Technical Field
The utility model relates to a cold-heading technology mould, concretely relates to durable double-stroke cold-heading technology die.
Background
In the forming process of the fastener, the cold heading technology is a main processing process, and the specific working process is that external force is applied to metal at normal temperature, so that the metal is formed in a preset die, and the forming process is very suitable for mass production of fastening bolts; further, the double-impact cold header is a universal device for manufacturing various fastening bolts, when in actual processing, a female die is arranged on a lathe of the double-impact cold header, a bolt blank is inserted into the inner periphery of the female die, and one side of the female die is respectively extruded by a male die punch of a press machine, so that the bolt is formed by cold heading according to a preset shape.
The square neck bolt is a universal fastening bolt structure, and is usually processed and formed by a cold heading process through a double-impact cold heading machine, as shown in fig. 1, a traditional female die 10 adopts a split mode with distributed front and rear ends, because the square neck bolt is stressed greatly during cold heading extrusion, and a square neck die 11 at the front section of the female die is thinner, the position of the square neck die 11 is easy to crack, and the perfect connection between the square neck die 11 at the front end and a reducing die 12 at the rear end is difficult to realize, so that scrap iron is embedded into a seam 13 of the female die 10, and the female die 10 is required to be dismounted frequently to be cleaned and then can be used again; this not only results in a short service life of the female die 10, but also in a complicated maintenance process.
The applicant wishes to improve on the above technical problem.
Disclosure of Invention
In view of this, the utility model aims at providing a durable double-shot cold-heading technology die can realize the high efficiency cold-heading shaping to the square neck bolt, avoids the square neck die position to take place cracked problem moreover, does not need the maintenance process of frequent dismouting simultaneously.
The utility model adopts the technical scheme as follows:
a durable double-impact cold heading process female die comprises an integrated primary heading female die and an integrated final heading female die, and a final heading bolt is obtained through the integrated final heading female die; the integral primary upsetting female die comprises a primary upsetting female die core and a primary upsetting die sleeve fixedly sleeved on the periphery of the primary upsetting female die core, wherein a primary upsetting extrusion stroke which is in extrusion fit with an external male die punch is arranged in a die cavity of the primary upsetting female die core and is used for performing primary upsetting and reducing on a bolt blank to obtain a primary upsetting bolt; integrative final-heading die is right including being used for just the mound bolt carries out square neck final-heading's square neck die and reducing die, the reducing die with square neck die integrated into one piece, just mound extrusion stroke is less than the length of square neck die is used for improving the durability of integrative final-heading die.
Preferably, the initial pier extrusion stroke is 7-8mm, and the length range of the square neck female die is 7.5-8.5 mm.
Preferably, the initial pier extrusion stroke is 7.5mm, and the length of the square neck female die is 8 mm.
Preferably, the length of integrative first upsetting die with integrative final upsetting die equals.
Preferably, the length range of the integral initial upsetting female die and the integral final upsetting female die is 25-35mm, and the length of the final upsetting bolt is smaller than that of the integral final upsetting female die.
Preferably, the length of the integral primary upsetting female die and the length of the integral final upsetting female die are both 30mm, and the length of the final upsetting bolt is 20-24 mm.
Preferably, the two sides of the die cavity of the square neck female die are respectively connected with cold heading gas grooves symmetrically extending towards the periphery of the square neck female die, and the cold heading gas grooves are communicated with the outside and used for avoiding the terminal bolt from being cracked when being subjected to end head cold heading forming.
Preferably, the head portion of the terminal upset bolt is disposed at an angle of 60 degrees, and the cold heading gas groove is disposed corresponding to the shape of the head portion.
It should be noted that the square neck female die related to the present application is also used for performing extrusion matching with an external male die punch to realize square neck final upsetting forming of a primary upsetting bolt, and is the same as the square neck final upsetting forming in the prior art, and the present application has no special limitation on the square neck final upsetting forming, so detailed description is not provided.
The utility model skillfully provides the primary upsetting female die with the primary upsetting extrusion stroke preset, realizes the primary upsetting necking of the bolt blank by the extrusion fit with the external male die punch to obtain the primary upsetting bolt, then an integral final upsetting female die is adopted to carry out square neck final upsetting forming on the initial upsetting bolt to obtain a final upsetting bolt with a square neck structure, because the primary upsetting female die realizes primary upsetting and reducing diameter of the bolt blank, the stress of subsequent square neck final upsetting is obviously reduced, so that the durability of the integral final upsetting female die is effectively enhanced, the problem of the fracture of the square neck female die is avoided, because the stress requirement is obviously reduced, a split-type die structure is not needed any more, therefore, the maintenance process that the joint part needs to be frequently disassembled and assembled due to the fact that scrap iron can be embedded in the joint part existing in the split mode structure is avoided, and the quick and efficient cold heading forming of the square neck bolt can be achieved.
Drawings
Fig. 1 is a schematic structural view of a die 10 in a split mode in the background art;
FIG. 2 is a schematic structural view of an integral primary upsetting female die according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an integral final upsetting die according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a final upset bolt according to an embodiment of the present invention;
fig. 5 is a schematic view of an end structure of the final-upsetting bolt according to the embodiment of the present invention.
Detailed Description
The embodiment of the utility model discloses a durable double-impact cold heading process die, which comprises an integrated primary heading die and an integrated final heading die, and a final heading bolt is obtained through the integrated final heading die; the integral primary upsetting female die comprises a primary upsetting female die core and a primary upsetting die sleeve fixedly sleeved on the periphery of the primary upsetting female die core, wherein a primary upsetting extrusion stroke which is in extrusion fit with an external male die punch is arranged in a die cavity of the primary upsetting female die core and is used for performing primary upsetting and reducing on a bolt blank to obtain a primary upsetting bolt; the integral final upsetting female die comprises a square neck female die and a reducing female die, wherein the square neck final upsetting female die and the reducing female die are used for performing square neck final upsetting on a primary upsetting bolt, the reducing female die and the square neck female die are integrally formed, and the primary upsetting extrusion stroke is smaller than the length of the square neck female die, so that the durability of the integral final upsetting female die is improved.
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
Referring to fig. 2, 3, 4 and 5, a durable double-impact cold heading process die comprises an integral primary heading die 20 and an integral final heading die 30, and a final heading bolt 1 is obtained through the integral final heading die 30; the integral primary upsetting female die 20 comprises a primary upsetting female die core 21 and a primary upsetting die sleeve 22 fixedly sleeved on the periphery of the primary upsetting female die core 21, and a primary upsetting extrusion stroke L in extrusion fit with an external male die punch (not shown) is arranged in a die cavity of the primary upsetting female die core 21 and used for performing primary upsetting and reducing on a bolt blank to obtain a primary upsetting bolt; the integral final upsetting female die 30 comprises a square neck female die 31 and a reducing female die 32, the square neck female die 31 and the reducing female die 32 are used for performing square neck final upsetting on the initial upsetting bolt, the reducing female die 32 and the square neck female die 31 are integrally formed, the initial upsetting extrusion stroke L is smaller than the length L31 of the square neck female die 31, and the durability of the integral final upsetting female die 30 is improved;
preferably, in the present embodiment, the initial pier extrusion stroke L is 7 to 8mm, and the length L31 of the square neck female die 31 ranges from 7.5 to 8.5 mm; particularly preferably, the initial pier extrusion stroke L is 7.5mm, and the length L31 of the square neck female die is 8 mm.
Preferably, in the present embodiment, the lengths L20, L30 of the integral first upsetting die 20 and the integral final upsetting die 30 are equal; further preferably, in the embodiment, the lengths L20 and L30 of the integral first upsetting concave die and the integral final upsetting concave die are both 25-35mm, and the length L1 of the final upsetting bolt 1 is smaller than the length L30 of the integral final upsetting concave die 30; specifically, preferably, in the present embodiment, the lengths L20, L30 of the integral first upsetting die 20 and the integral final upsetting die 30 are both 30mm, the length L1 of the final upsetting bolt 1 is 20-24mm, specifically, in the present embodiment, the length L1 of the final upsetting bolt 1 is 22.5mm, and the rod portion outer diameter Φ 1 is 8 mm;
preferably, in the present embodiment, the two sides of the die cavity of the square neck female die 31 are respectively connected with the cold heading gas grooves 33 symmetrically extending to the periphery thereof, and the cold heading gas grooves 33 are communicated with the outside for preventing the terminal bolt 1 from being cracked when the terminal 1a is subjected to cold heading forming; further preferably, in the present embodiment, the head end portion 1a of the terminal stud 1 is disposed at an angle of 60 °, and the cold heading gas groove 33 is disposed corresponding to the shape of the head end portion 1 a.
In the embodiment, the initial upsetting female die 20 with the initial upsetting extrusion stroke L is skillfully provided, the initial upsetting and diameter reduction of the bolt blank are realized by the extrusion matching with the external male die punch to obtain the initial upsetting bolt, then the integral final upsetting female die 30 is adopted to perform the square neck final upsetting forming on the initial upsetting bolt to obtain the final upsetting bolt 1 with the square neck structure 1b, the initial upsetting female die 20 realizes the initial upsetting and diameter reduction on the bolt blank, the subsequent stress of the square neck final upsetting is obviously reduced, the durability of the integral final upsetting female die 30 is effectively enhanced, the problem that the position of the square neck female die 31 is cracked is avoided, the stress requirement is obviously reduced, the split-mode female die structure is not required, and the maintenance process that the joint of the split-mode structure needs frequent disassembly and assembly due to the fact that scrap iron can be embedded is avoided at the same time, the quick and efficient cold heading forming of the square neck bolt (namely the final heading bolt 1) can be realized; the embodiment can be known through implementing the effect contrast, and the life of die 10 is only half a day among the prior art, and the life of the integrative final upsetting die 30 of this embodiment reaches 3 days at least, has effectively practiced thrift cold-heading mould cost, can effectively improve the double-impact cold-heading process efficiency of square neck bolt moreover.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A durable double-impact cold heading process female die is characterized by comprising an integrated primary heading female die and an integrated final heading female die, wherein a final heading bolt is obtained through the integrated final heading female die; the integral primary upsetting female die comprises a primary upsetting female die core and a primary upsetting die sleeve fixedly sleeved on the periphery of the primary upsetting female die core, wherein a primary upsetting extrusion stroke which is in extrusion fit with an external male die punch is arranged in a die cavity of the primary upsetting female die core and is used for performing primary upsetting and reducing on a bolt blank to obtain a primary upsetting bolt; integrative final-heading die is right including being used for just the mound bolt carries out square neck final-heading's square neck die and reducing die, the reducing die with square neck die integrated into one piece, just mound extrusion stroke is less than the length of square neck die is used for improving the durability of integrative final-heading die.
2. The die for durable double-stroke cold heading process according to claim 1, wherein the initial heading extrusion stroke is 7-8mm, and the length of the square neck die is in the range of 7.5-8.5 mm.
3. The die for durable double-stroke cold heading process according to claim 1, wherein the initial heading extrusion stroke is 7.5mm, and the length of the square neck die is 8 mm.
4. The durable double-impact cold heading process die according to claim 1, 2 or 3, wherein the lengths of the integral primary heading die and the integral final heading die are equal.
5. The durable double-stroke cold heading process die according to claim 4, wherein the length ranges of the integral first heading die and the integral final heading die are both 25-35mm, and the length of the final heading bolt is smaller than that of the integral final heading die.
6. The durable double-stroke cold heading process die according to claim 5, wherein the lengths of the integrated primary heading die and the integrated final heading die are both 30mm, and the length of the final heading bolt is 20-24 mm.
7. The durable double-impact cold heading process die according to claim 1, wherein cold heading gas grooves symmetrically extending towards the periphery of the square neck die are connected to two sides of a die cavity of the square neck die respectively, and the cold heading gas grooves are communicated with the outside and used for avoiding fragmentation of a final heading bolt during end part cold heading forming.
8. The durable double-impact cold-heading process die according to claim 7, wherein a head portion of the final heading bolt is disposed at an angle of 60 °, and the cold heading gas groove is disposed corresponding to a shape of the head portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021080988.4U CN212495131U (en) | 2020-06-12 | 2020-06-12 | Durable double-impact cold heading process female die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021080988.4U CN212495131U (en) | 2020-06-12 | 2020-06-12 | Durable double-impact cold heading process female die |
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| Publication Number | Publication Date |
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| CN212495131U true CN212495131U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021080988.4U Active CN212495131U (en) | 2020-06-12 | 2020-06-12 | Durable double-impact cold heading process female die |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192731A (en) * | 2021-11-15 | 2022-03-18 | 济南实达紧固件有限公司 | Carriage bolt production method, carriage bolt and alloy sheet |
| CN117862397A (en) * | 2024-03-13 | 2024-04-12 | 江苏大洋精锻有限公司 | Forging and pressing die for cutting pick boots |
-
2020
- 2020-06-12 CN CN202021080988.4U patent/CN212495131U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192731A (en) * | 2021-11-15 | 2022-03-18 | 济南实达紧固件有限公司 | Carriage bolt production method, carriage bolt and alloy sheet |
| CN117862397A (en) * | 2024-03-13 | 2024-04-12 | 江苏大洋精锻有限公司 | Forging and pressing die for cutting pick boots |
| CN117862397B (en) * | 2024-03-13 | 2024-05-14 | 江苏大洋精锻有限公司 | Forging and pressing die for cutting pick boots |
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