CN110640065A - Integrated cold heading forming die and cold heading process for brake rivet - Google Patents
Integrated cold heading forming die and cold heading process for brake rivet Download PDFInfo
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- CN110640065A CN110640065A CN201910944623.7A CN201910944623A CN110640065A CN 110640065 A CN110640065 A CN 110640065A CN 201910944623 A CN201910944623 A CN 201910944623A CN 110640065 A CN110640065 A CN 110640065A
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- 230000008569 process Effects 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000004080 punching Methods 0.000 claims abstract description 6
- 241001079814 Symphyotrichum pilosum Species 0.000 claims description 11
- 235000004224 Typha angustifolia Nutrition 0.000 claims description 11
- 241001133184 Colletotrichum agaves Species 0.000 claims description 9
- 238000005242 forging Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 241000587161 Gomphocarpus Species 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000000465 moulding Methods 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
- B21J13/02—Dies or mountings therefor
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- 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
- B21K1/58—Making machine elements rivets
- B21K1/62—Making machine elements rivets special rivets, e.g. with electrical contacts
Abstract
The invention discloses a brake rivet integrated cold heading forming die and a cold heading process, wherein the brake rivet is subjected to integrated cold heading forming through a die, a die and a die, and a cylindrical bar material preformed piece e is punched in the die and subjected to cold heading to form a screw rod, so that a preformed piece a is formed; conveying the preform a into a two-die by using a conveying device, wherein the preform a is subjected to stamping and cold heading to form a blank pin head in the two-die to form a preform b; conveying the preform b into a three-die by using a conveying device, wherein the preform b is subjected to punching and cold heading to form a nail head in the three-die to form a preform c; conveying the preformed piece c into a four-die by using a conveying device, wherein the preformed piece c is punched and cold-headed to form a nail tail in the four-die to form a formed piece d; the invention uses the integrated cold heading forming mode to form the brake rivet instead of hot forming, thereby having higher forming efficiency and lower energy consumption.
Description
Technical Field
The invention relates to the technical field of brake rivet processing, in particular to a brake rivet integrated cold heading forming die and a cold heading process.
Background
The brake rivet shown in figure 1 is formed by connecting a nail post 1, a nail rod 2, a nail head 3 and a nail tail 4, wherein the lower end of the nail post is connected with the nail rod, and the upper end of the nail post and the lower end of the nail rod are respectively connected with the nail head and the nail tail.
The brake rivet is generally subjected to compression molding after being heated to the metal forging temperature by the mold, and then the molded brake rivet is subjected to temperature return treatment, the temperature rise and temperature reduction process of the high-temperature compression molding mode needs a certain time, a large amount of energy consumption needs to be used, the processing efficiency is low, and therefore the integrated cold heading molding mold and the cold heading process of the brake rivet are high in processing efficiency, simple in operation and reasonable in design.
Disclosure of Invention
The invention aims to provide an integrated cold heading forming die and a cold heading process for a brake rivet, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a brake rivet integrated cold heading forming die comprises a first die, a second die, a third die and a fourth die which are used for forming a forge piece in sequence; the die comprises a die master die and a die male die, the die master die comprises a die master die shell, a die master die inner die upper core is arranged inside one end of the die master die shell, a die master die core is arranged inside the die master die upper core, a die master die inner die rear pad is arranged at the other end inside the die master die shell, and a die through rod penetrates through the inside of the die master die inner die rear pad; the one-die male die comprises a one-die stamping die, one end inside the one-die stamping die is provided with a stamping die core, the other end inside the one-die stamping die is provided with a die stamping die rear pad, and one end of the one-die stamping die rear pad is provided with a die stamping rod; the die male die reciprocates towards the die female die to punch and cold-heading to form a preformed piece a;
the two-die comprises a two-die female die and a two-die male die, the two-die female die comprises a two-die main die shell, a two-die main die rear tooth is arranged at the lower end of the two-die main die shell, a two-die main die inner die upper kernel is arranged inside one end of the two-die main die shell, a two-die main die core is arranged inside the two-die main die inner die upper kernel, a two-die main die inner die rear pad is arranged at the other end inside the two-die main die shell, and a two-die through rod penetrates through the inside of the two-die main die inner die rear pad; the two-die male die comprises a two-die stamping die, wherein two-die stamping die cores are arranged at one end inside the two-die stamping die, a two-die stamping die rear pad is arranged at the other end inside the two-die stamping die, a two-die stamping rod is arranged at one end of the two-die stamping die rear pad, and the two-die male die reciprocates towards a two-die female die to stamp and cold heading to form a preformed piece b;
the three-die comprises a three-die female die and a three-die male die, the three-die female die comprises a three-die main die shell, a three-die main die back tooth is arranged at the lower end of the three-die main die shell, a three-die main die inner die upper kernel is arranged inside one end of the three-die main die shell, a three-die main die core is arranged inside the three-die main die inner die upper kernel, a three-die main die inner die back cushion is arranged at the other end inside the three-die main die shell, and a three-die through rod is arranged inside the three-die main die inner die back cushion; the three-die male die comprises a three-die stamping die, a three-die stamping assembly penetrates through the interior of the three-die stamping die and consists of a three-die stamping column and a three-die stamping head, and the three-die male die performs reciprocating motion towards a three-die female die to stamp cold heading to form a preformed piece c;
the four-die comprises a four-die master die and a four-die male die, the four-die master die comprises a four-die master die shell, a four-die master rear tooth is arranged at the lower end of the four-die master die shell, four-die opening and closing master dies are symmetrically arranged in one end of the four-die master die shell, a four-die opening and closing die is arranged between the four-die opening and closing master dies, a four-die master internal die is arranged at one end of the four-die opening and closing die, a four-die master die core is arranged in the four-die master internal die, a four-die master internal die rear cushion is arranged at the other end of the interior of the four-die master die shell, four-die master internal die springs are symmetrically arranged between the four-die master internal die rear cushion and the edge of the four-die master internal die, and a four-die through rod penetrates through the middle; the four-die male die comprises a four-die shell, wherein a four-die rear pad is arranged at the other end of the interior of the four-die shell, a four-die stamping assembly penetrates through the interior of the four-die shell and comprises four stamping rods, the four stamping rods are located on the lower side of the four-die rear pad, four stamping rod ejector pins are arranged on two sides of the four stamping rods, a first four-die rear pad spring is arranged in the four-die rear pad, and the four-die male die performs reciprocating motion towards the four-die female die to perform stamping and cold heading to form a finished part d.
An integrated cold heading process for a brake rivet comprises the following steps:
s0, preparing materials, and cutting cylindrical bars to serve as nail columns;
s1, punching and cold heading the nail rod on the cylindrical bar material preformed piece e by using a die to form a preformed piece a;
s2, utilizing a two-die to punch and cold-heading the preformed piece a to form a blank pin head to form a preformed piece b;
s3, utilizing a three-die to punch and cold-heading the pin head on the preform b to form a preform c;
and S4, utilizing a four-die to punch and cold-upset the preform c to form a nail tail, and forming a preform d.
Preferably, the inner die spring of the four-die main die and the first four-die back cushion spring are both springs.
Compared with the prior art, the invention has the beneficial effects that: a brake rivet integrated cold heading forming die is characterized in that the brake rivet is subjected to integrated cold heading forming through a first die, a second die, a third die and a fourth die, the brake rivet is formed by connecting a nail column, a nail rod, a nail head and a nail tail, the lower end of the nail column is connected with the nail rod, the upper end of the nail column and the lower end of the nail rod are respectively connected with the nail head and the nail tail, and a cylindrical bar material preformed piece e is punched in the first die to be subjected to cold heading to form the nail rod to form a preformed piece a; conveying the preform a into a two-die by using a conveying device, wherein the preform a is subjected to stamping and cold heading to form a blank pin head in the two-die to form a preform b; conveying the preform b into a three-die by using a conveying device, wherein the preform b is subjected to punching and cold heading to form a nail head in the three-die to form a preform c; conveying the preformed piece c into a four-die by using a conveying device, wherein the preformed piece c is punched and cold-headed to form a nail tail in the four-die to form a formed piece d; the invention uses the integrated cold heading forming mode to form the brake rivet instead of hot forming, thereby having higher forming efficiency and lower energy consumption.
Drawings
FIG. 1 is a schematic structural view of a brake rivet according to the present invention;
FIG. 2 is a schematic view of a mold according to the present invention;
FIG. 3 is a schematic structural view of a second mold of the present invention;
FIG. 4 is a schematic structural view of a triple mold of the present invention;
FIG. 5 is a schematic structural view of a four-die of the present invention;
FIG. 6 is a schematic view of the sequential formation of brake rivets in accordance with the present invention.
In the figure: 1-nail column, 2-nail rod, 3-nail head, 4-nail tail, 51-one-die main die shell, 52-one-die main die inner die upper core, 53-one-die main die core, 54-one-die main die inner die rear pad, 55-one-die through rod, 56-one-die stamping die, 57-one-die stamping die core, 58-one-die stamping die rear pad, 59-one-die stamping rod, 61-two-die main die shell, 62-two-die main die rear tooth, 63-two-die main die inner die upper core, 64-two-die main die core, 65-two-die main die inner die rear pad, 66-two-die through rod, 67-two-die stamping die, 68-two-die stamping die core, 69-two-die stamping die rear pad, 610-two-die stamping die rod, 71-three-die main die shell, 72-three-die main die rear die core, 73-three-die main die upper inner die upper core, 74-three-die main die core, 75-three-die main die inner die rear pad, 76-three-die through rod, 77-three-die stamping die, 78-three-die stamping column, 79-three-die stamping head, 81-four-die main die shell, 82-four-die main die rear tooth, 83-four-die opening and closing female die, 84-four-die opening and closing die, 85-four-die main die inner die, 86-four-die main die core, 87-four-die main die inner die rear pad, 88-four-die main die inner die spring, 89-four-die through rod, 810-four-die stamping die shell, 811-four-die rear pad, 812-four-die stamping rod, 813-first four-die rear pad spring and 814-second four die rear pad spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 6, the present invention provides a technical solution: the brake rivet integrated cold heading forming die comprises a first die, a second die, a third die and a fourth die which are used for sequentially forming a forged piece, and a cylindrical bar preformed piece e is punched in the first die and subjected to cold heading to form the nail rod to form a preformed piece a; conveying the preform a into a two-die by using a conveying device, wherein the preform a is subjected to stamping and cold heading to form a blank pin head in the two-die to form a preform b; conveying the preform b into a three-die by using a conveying device, wherein the preform b is subjected to punching and cold heading to form a nail head in the three-die to form a preform c; conveying the preformed piece c into a four-die by using a conveying device, wherein the preformed piece c is punched and cold-headed to form a nail tail in the four-die to form a formed piece d; in addition, the preformed pieces between the first die, the second die, the third die and the fourth die can be manually clamped and also can be conveyed through a transmission device, so that the device also comprises a conveying device for clamping the cast pieces to pass through the first die, the second die, the third die and the fourth die in sequence, the conveying device can be any one of the prior art, the clamping and conveying effects can be realized, and therefore the preformed pieces are not shown in the figures and the technical scheme;
referring to fig. 2, the first mold comprises a main mold half and a male mold half, the first mold half comprises a main mold half 51, an inner core 52 of the main mold is disposed inside one end of the main mold half, a slot is disposed on an inner sidewall of the main mold half, a protrusion cooperating with the slot is disposed on an outer sidewall of the inner core of the main mold half, the slot and the protrusion cooperate to position one end of the inner core of the main mold half inside the main mold half, a main mold core 53 is disposed inside the inner core of the main mold half, one end of the preform e is molded inside the main mold half, a main mold back pad 54 is disposed inside the other end of the main mold half, a main mold back pad positions the inner core of the main mold half inside the main mold half, and a mold through rod 55 is disposed inside the main mold back pad, a die through rod extending into a die main die core, the die male die comprises a die stamping die 56, one end of the interior of the die stamping die is provided with a die stamping die core 57, the other end of the preformed piece e is formed in the die stamping die core, the other end of the interior of the die stamping die is provided with a die stamping back pad 58, one end of the die stamping back pad is provided with a die stamping rod 59, the die stamping rod extends into the interior of the die stamping die core, the die stamping rod can stamp the preformed piece e for cold heading, and the die male die moves towards a die female die in a reciprocating mode to stamp the cold heading to form a preformed piece a;
referring to fig. 3, the second mold comprises a second mold female mold and a second mold male mold, the second mold female mold comprises a second mold main mold shell 61, a second mold main mold back tooth 62 is arranged at the lower end of the second mold main mold shell, a second mold main mold upper core 63 is arranged inside one end of the second mold main mold shell, a clamping groove is arranged on the inner side wall of the second mold main mold shell, a protrusion matched with the second mold clamping groove is arranged on the outer side wall of the second mold main mold upper core, the clamping groove and the protrusion are matched to position one end of the second mold main mold upper core in the second mold main mold shell, a second mold main mold core 64 is arranged inside the second mold main mold upper core, one end of a preformed piece a is formed in the second mold main mold core, a second mold main mold inner mold back pad 65 is arranged at the other end of the second mold main mold shell, the second mold main mold inner mold back pad positions the second mold upper core in the other end of the second mold main mold shell, a second die through rod 66 penetrates through the inner part of the rear pad of the inner die of the two-die main die and extends into a core of the two-die main die, the second die male die comprises a second die stamping die 67, one end of the inner part of the second die stamping die is provided with a second die stamping die core 68, the other end of the preformed piece a is formed in the second die stamping die core, the other end of the inner part of the second die stamping die is provided with a second die stamping die rear pad 69, one end of the second die stamping die rear pad is provided with a second die stamping rod 610, the second die stamping rod extends into the inner part of the second die stamping die core, the second die stamping rod can stamp and cold-upset the preformed piece a, and the second die male die reciprocates towards the second die female die to stamp and cold-upset the preformed piece b;
referring to fig. 4, the three-mold includes a three-mold master mold and a three-mold male mold, the three-mold master mold includes a three-mold master mold shell 71, a three-mold master rear tooth 72 is disposed at a lower end of the three-mold master mold shell, a three-mold master mold upper core 73 is disposed inside one end of the three-mold master mold shell, a clamping groove is disposed on an inner sidewall of the three-mold master mold shell, a protrusion matched with the three-mold clamping groove is disposed on an outer sidewall of the three-mold master mold upper core, the clamping groove and the protrusion are matched to position one end of the three-mold master mold upper core in the three-mold master mold shell, a three-mold master mold core 74 is disposed inside the three-mold master mold upper core, one end of a preform b is molded in the three-mold master mold core, a three-mold master mold rear pad 75 is disposed at the other end of the three-mold master mold shell, the three-mold master mold rear pad positions the three-mold master mold upper core at the other end of the three-mold master mold shell, a three-die through rod 76 is arranged inside the rear pad of the inner die of the three-die main die, the three-die through rod extends into a die core of the three-die main die, the three-die male die comprises a three-die stamping die 77, a three-die stamping die assembly penetrates through the inside of the three-die stamping die, the three-die stamping die assembly consists of a three-die stamping column 78 and a three-die stamping head 79, the other end of the preformed piece b is flattened and formed by the three-die stamping die assembly, and the three-die male die reciprocates towards the three-die female die to stamp and cold heading to form a preformed piece c;
referring to fig. 5, the four-mold includes a four-mold female mold and a four-mold male mold, the four-mold female mold includes a four-mold main mold shell 81, a four-mold main mold back tooth 82 is disposed at a lower end of the four-mold main mold shell, a four-mold opening and closing female mold 83 is symmetrically disposed inside one end of the four-mold main mold shell, a four-mold opening and closing mold 84 is disposed between the four-mold opening and closing female molds, a four-mold main mold 85 is disposed at one end of the four-mold opening and closing mold, a four-mold main mold 86 is disposed inside the four-mold main mold shell, a four-mold main mold back pad 87 is disposed at the other end of the four-mold main mold shell, four-mold main mold back springs 88 are symmetrically disposed between the four-mold main mold back pad and the four-mold main mold back pad, a fourth mold back pad 814 is disposed between the four-mold main mold back tooth 82 and the four-mold back pad 87, the elastic action of the second four-die back cushion spring is convenient for the separation between the four-die main die back teeth 82 and the four-die main die inner die back cushion 87, and a four-die through rod 89 penetrates through the middle part of the four-die main die inner die back cushion; the four-die male die comprises a four-die shell 810, the other end of the four-die shell is provided with a four-die rear pad 811, the inside of the four-die shell is provided with four-die stamping assemblies in a penetrating manner, the four-die stamping assemblies comprise four-die stamping rods 812, the four-die stamping rods are located at the lower sides of the four-die rear pads, two sides of the four-die stamping rods are provided with four-die stamping rod ejector pins, a first four-die rear pad spring 813 is arranged in the four-die rear pad, the elastic action of the first four-die rear pad spring is convenient to split the four-die rear pad, and the four-die male die is stamped towards the four-die female die in a reciprocating motion and forms a finished product d.
Specifically, the four-die elastic piece, the four-die main die internal die spring and the four-die first four-die rear cushion spring are all springs.
The working principle is as follows: the brake rivet integrated cold heading forming die comprises a first die, a second die, a third die and a fourth die which are used for sequentially forming a forged piece, and a cylindrical bar preformed piece e is punched in the first die and subjected to cold heading to form the nail rod to form a preformed piece a; conveying the preform a into a two-die by using a conveying device, wherein the preform a is subjected to stamping and cold heading to form a blank pin head in the two-die to form a preform b; conveying the preform b into a three-die by using a conveying device, wherein the preform b is subjected to punching and cold heading to form a nail head in the three-die to form a preform c; conveying the preformed piece c into a four-die by using a conveying device, wherein the preformed piece c is punched and cold-headed to form a nail tail in the four-die to form a formed piece d; in addition, the preformed parts between the first die, the second die, the third die and the fourth die can be manually clamped, or can be conveyed through a transmission device, so that the device further comprises a conveying device for clamping the cast parts to pass through the first die, the second die, the third die and the fourth die in sequence, the conveying device can be any one of the prior art, the clamping conveying function can be realized, and therefore the conveying device is not shown in the figures and the technical scheme.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides an integrative cold-heading forming die of brake rivet which characterized in that: the forging forming die comprises a first die, a second die, a third die and a fourth die which are used for forming a forging in sequence; the die comprises a die master die and a die male die, the die master die comprises a die master die shell, a die master die inner die upper core is arranged inside one end of the die master die shell, a die master die core is arranged inside the die master die upper core, a die master die inner die rear pad is arranged at the other end inside the die master die shell, and a die through rod penetrates through the inside of the die master die inner die rear pad; the one-die male die comprises a one-die stamping die, one end inside the one-die stamping die is provided with a stamping die core, the other end inside the one-die stamping die is provided with a die stamping die rear pad, and one end of the one-die stamping die rear pad is provided with a die stamping rod; the die male die reciprocates towards the die female die to punch and cold-heading to form a preformed piece a;
the two-die comprises a two-die female die and a two-die male die, the two-die female die comprises a two-die main die shell, a two-die main die rear tooth is arranged at the lower end of the two-die main die shell, a two-die main die inner die upper kernel is arranged inside one end of the two-die main die shell, a two-die main die core is arranged inside the two-die main die inner die upper kernel, a two-die main die inner die rear pad is arranged at the other end inside the two-die main die shell, and a two-die through rod penetrates through the inside of the two-die main die inner die rear pad; the two-die male die comprises a two-die stamping die, wherein two-die stamping die cores are arranged at one end inside the two-die stamping die, a two-die stamping die rear pad is arranged at the other end inside the two-die stamping die, a two-die stamping rod is arranged at one end of the two-die stamping die rear pad, and the two-die male die reciprocates towards a two-die female die to stamp and cold heading to form a preformed piece b;
the three-die comprises a three-die female die and a three-die male die, the three-die female die comprises a three-die main die shell, a three-die main die back tooth is arranged at the lower end of the three-die main die shell, a three-die main die inner die upper kernel is arranged inside one end of the three-die main die shell, a three-die main die core is arranged inside the three-die main die inner die upper kernel, a three-die main die inner die back cushion is arranged at the other end inside the three-die main die shell, and a three-die through rod is arranged inside the three-die main die inner die back cushion; the three-die male die comprises a three-die stamping die, a three-die stamping assembly penetrates through the interior of the three-die stamping die and consists of a three-die stamping column and a three-die stamping head, and the three-die male die performs reciprocating motion towards a three-die female die to stamp cold heading to form a preformed piece c;
the four-die comprises a four-die master die and a four-die male die, the four-die master die comprises a four-die master die shell, a four-die master rear tooth is arranged at the lower end of the four-die master die shell, four-die opening and closing master dies are symmetrically arranged in one end of the four-die master die shell, a four-die opening and closing die is arranged between the four-die opening and closing master dies, a four-die master internal die is arranged at one end of the four-die opening and closing die, a four-die master die core is arranged in the four-die master internal die, a four-die master internal die rear cushion is arranged at the other end of the interior of the four-die master die shell, four-die master internal die springs are symmetrically arranged between the four-die master internal die rear cushion and the edge of the four-die master internal die, and a four-die through rod penetrates through the middle; the four-die male die comprises a four-die shell, wherein a four-die rear pad is arranged at the other end of the interior of the four-die shell, a four-die stamping assembly penetrates through the interior of the four-die shell and comprises four stamping rods, the four stamping rods are located on the lower side of the four-die rear pad, four stamping rod ejector pins are arranged on two sides of the four stamping rods, a first four-die rear pad spring is arranged in the four-die rear pad, and the four-die male die performs reciprocating motion towards the four-die female die to perform stamping and cold heading to form a finished part d.
2. The brake and rivet integrated cold heading process is characterized in that: the method comprises the following steps:
s0, preparing materials, and cutting cylindrical bars to serve as nail columns;
s1, punching and cold heading the nail rod on the cylindrical bar material preformed piece e by using a die to form a preformed piece a;
s2, utilizing a two-die to punch and cold-heading the preformed piece a to form a blank pin head to form a preformed piece b;
s3, utilizing a three-die to punch and cold-heading the pin head on the preform b to form a preform c;
and S4, utilizing a four-die to punch and cold-upset the preform c to form a nail tail, and forming a preform d.
3. The integrated cold heading forming die for the brake rivet as claimed in claim 1, wherein: and the four-die main die inner die spring and the first four-die rear cushion spring are both springs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910944623.7A CN110640065A (en) | 2019-09-30 | 2019-09-30 | Integrated cold heading forming die and cold heading process for brake rivet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910944623.7A CN110640065A (en) | 2019-09-30 | 2019-09-30 | Integrated cold heading forming die and cold heading process for brake rivet |
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| CN110640065A true CN110640065A (en) | 2020-01-03 |
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| CN201910944623.7A Withdrawn CN110640065A (en) | 2019-09-30 | 2019-09-30 | Integrated cold heading forming die and cold heading process for brake rivet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433779A (en) * | 2022-02-14 | 2022-05-06 | 上海奥达科股份有限公司 | Novel rivet forming method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433779A (en) * | 2022-02-14 | 2022-05-06 | 上海奥达科股份有限公司 | Novel rivet forming method |
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