CN114535489B - Rivet type electric contact demoulding device and method - Google Patents
Rivet type electric contact demoulding device and method Download PDFInfo
- Publication number
- CN114535489B CN114535489B CN202210016503.2A CN202210016503A CN114535489B CN 114535489 B CN114535489 B CN 114535489B CN 202210016503 A CN202210016503 A CN 202210016503A CN 114535489 B CN114535489 B CN 114535489B
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- Prior art keywords
- push rod
- electric contact
- rivet
- type electric
- motor
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910001369 Brass Inorganic materials 0.000 claims description 5
- 239000010951 brass Substances 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 3
- 208000027418 Wounds and injury Diseases 0.000 abstract description 2
- 230000006378 damage Effects 0.000 abstract description 2
- 208000014674 injury Diseases 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Switches (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
The invention relates to the field of cold header material processing and manufacturing, in particular to a rivet type electric contact demoulding device and method. The device comprises a machine body, a forming bottom die and an electric demoulding assembly; the electric demoulding assembly comprises a motor bracket, a rotary driving motor, a motor rotating rod, a motor connecting rod, a rear push rod and a front push rod, wherein a push rod fixing buckle is fixed on the machine body, the front push rod penetrates through the push rod fixing buckle, the rotary driving motor drives the front push rod to do reciprocating motion so that the front push rod is close to the forming bottom die and then touches a rivet type electric contact formed by the forming bottom die to enable the rivet type electric contact to be demoulded and far away from the forming bottom die. According to the rivet type electric contact demoulding device and method, the electric contact is pushed by means of stable and controllable active touch, so that the problem of severe collision injury in the manufacturing process of the electric contact can be completely avoided, the quality of a product is improved, and the production cost is reduced. The present invention is therefore necessary in view of the quality and cost requirements of electrical contact products.
Description
Technical Field
The invention relates to the field of cold header material processing and manufacturing, in particular to a rivet type electric contact demoulding device and method.
Background
The rivet type electric contact product is characterized in that one or two alloy materials are upsetted into a rivet type electric contact in the manufacturing process, and after upsetting, a bottom die needle pushes the electric contact out of a forming bottom die to be separated. When the electric contact is continuously manufactured, the bottom die needle and the forming bottom die are worn, so that the electric contact is difficult to separate from the forming bottom die smoothly, impact marks are formed on the surface of the electric contact when other dies such as a cutter impact the surface of the electric contact, and the use of a product is affected. The conventional auxiliary demolding method adopts compressed air to blow off the product, but the instability of the flow rate and the instability of the flow direction of the compressed air often cause the collision of the electrical contact and the machine body of the equipment.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provides a rivet type electric contact demoulding device and method.
The technical scheme adopted by the invention is as follows: the rivet type electric contact demoulding device comprises a machine body, a forming bottom die and an electric demoulding assembly, wherein the forming bottom die is arranged on the machine body and is used for forming rivet type electric contacts;
The electric demoulding assembly comprises a motor support fixed on a machine body, a rotary driving motor fixed on the motor support, a motor connecting rod connected with a motor rotating rod of the rotary driving motor, a rear push rod hinged with the outer end part of the motor connecting rod, and a front push rod hinged with the end part of the rear push rod far away from the motor rotating rod, wherein a push rod fixing buckle is fixed on the machine body, the front push rod penetrates through the push rod fixing buckle, the rotary driving motor drives the front push rod to do reciprocating motion through the motor rotating rod, the motor connecting rod and the rear push rod, so that the front push rod is close to a forming bottom die and then touches a rivet type electric contact formed by the forming bottom die to enable the rivet type electric contact to be demoulded and far away from the forming bottom die.
The push rod fixing buckle is made of stainless steel, and the part of the front push rod, which is contacted with the push rod fixing buckle, is made of brass.
The end part of the front push rod, which is used for touching the rivet type electric contact, is made of pure silver.
The rotary driving motor is a servo motor or a stepping motor.
The rear push rod is connected with the front push rod by a push rod connecting shaft, and a medium-free sliding structure is arranged between the rear push rod and the front push rod.
As a preferred embodiment of the invention, the front end part of the front push rod is an arc-shaped groove matched with the outer edge of the head part of the corresponding rivet-type electric contact, and the front end part of the front push rod moves back and forth to enable the front end part to touch the head part of the rivet-type electric contact.
The rivet type electric contact demoulding method adopts the rivet type electric contact demoulding device, the rotary driving motor drives the front push rod to reciprocate in a continuous operation mode, and the electric contact push rod is retracted after touching the head of the rivet type electric contact.
As another preferred embodiment of the present invention, the front end of the front push rod is provided with a groove which is wider than the foot of the rivet-type electric contact and smaller than the head of the rivet-type electric contact, and the front end of the front push rod moves back and forth corresponding to the foot of the rivet-type electric contact so as to touch the foot of the rivet-type electric contact.
The rivet type electric contact demoulding method adopts the rivet type electric contact demoulding device, the rotary driving motor drives the front push rod to reciprocate in an intermittent operation mode, and when the groove at the front end part of the front push rod clamps the foot part of the rivet type electric contact, the rivet type electric contact is stopped, and the electric contact is retracted again when being separated.
The beneficial effects of the invention are as follows: according to the rivet type electric contact demoulding device and method, the electric contact is pushed by means of stable and controllable active touch, so that the problem of severe collision injury in the manufacturing process of the electric contact can be completely avoided, the quality of a product is improved, and the production cost is reduced. The present invention is therefore necessary in view of the quality and cost requirements of electrical contact products.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of the front putter according to embodiment 1 of the present invention when the front putter is extended;
FIG. 3 is a schematic diagram of the structure of the front push rod in the embodiment 1 of the present invention during ejection and demolding;
FIG. 4 is a schematic diagram of the structure of the front putter in accordance with embodiment 1 of the present invention;
FIG. 5 is a schematic view of the structure of the front putter in accordance with embodiment 1 of the present invention when the front putter is returned;
FIG. 6 is a schematic view showing the structure of the end of the front putter in accordance with embodiment 1 of the present invention;
FIG. 7 is a schematic diagram showing the top-down operation of the ejector stripping in example 1 of the present invention;
FIG. 8 is a schematic view showing the structure of the end of the front putter in accordance with embodiment 2 of the present invention;
FIG. 9 is a schematic diagram showing the top-down operation of the ejector stripping in example 2 of the present invention;
In the figure, 1, a machine body; 2, forming a bottom die; 3, rivet type electric contact; 4, fixing the buckle by the push rod; 5, a front push rod; 6, connecting a front push rod with a shaft; 7, a rear push rod; 8, a rear push rod connecting shaft; 9, a motor connecting rod; 10, a motor rotating rod; 11, a rotary driving motor; 12, a motor fixing screw; 13, a motor bracket.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
It should be noted that, in the embodiments of the present invention, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present invention, and the following embodiments are not described one by one.
The terms of direction and position in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the invention and are not intended to limit the scope of the invention.
Example 1:
as shown in fig. 1, the rivet type electric contact demoulding device comprises a machine body 1, a forming bottom die 2 and an electric demoulding assembly, wherein the forming bottom die 2 is arranged on the machine body 1, and the forming bottom die 2 is used for forming rivet type electric contacts 3;
The electric demoulding assembly comprises a motor bracket 13 fixed on the machine body 1, a rotary driving motor 11 fixed on the motor bracket 13, a motor connecting rod 9 connected with a motor rotating rod 10 of the rotary driving motor 11, a rear push rod 7 hinged with the outer end part of the motor connecting rod 9, and a front push rod 5 hinged with the end part of the rear push rod 7 far away from the motor rotating rod 10, wherein a push rod fixing buckle 4 is fixed on the machine body 1, the front push rod 5 penetrates through the push rod fixing buckle 4, and the rotary driving motor 11 drives the front push rod 5 to do reciprocating motion through the motor rotating rod 10, the motor connecting rod 9 and the rear push rod 7 so that the front push rod 5 is close to the forming bottom die 2 and then touches the rivet-shaped electric contact 3 formed by the forming bottom die 2 to enable the rivet-shaped electric contact 3 to be demoulded and far away from the forming bottom die 2.
Preferably, the push rod fixing buckle 4 is made of stainless steel, and the part of the front push rod 5, which is contacted with the push rod fixing buckle 4, is made of brass. The push rod fixing buckle 4 is used for limiting the vertical deflection amplitude of the electric contact push rod in reciprocating motion, and the wear resistance of the parts in contact with each other can be improved and the service life of the device can be prolonged by limiting the material of the corresponding contact parts.
Preferably, the end portion of the front push rod 5 used for touching the rivet-type electrical contact 3 is made of pure silver, so that pollution to the electrical contact during contact is avoided, and a certain impact buffering effect is achieved.
The front push rod 5 can be integrally formed by adopting pure silver without considering the service life, or the front push rod 5 can be integrally formed by adopting brass without considering the pollution problem to the electric contact, and the optimal scheme is that the front push rod 5 is a composite structure of which the main body adopts brass and the end part adopts pure silver.
The rotary driving motor 11 is a servo motor or a stepping motor. When the servo motor operates, different operating speeds and push rod residence time can be set according to the specification and the size of the product, and the servo motor has higher operating precision. The stepping motor is used as a power source, and the motor is smaller in size. Preferably, a servo motor scheme is adopted, so that the push rod has higher operation precision, higher response speed and stability.
The rear push rod 7 is connected with the front push rod 5 by a push rod connecting shaft 8, and a medium-free sliding structure is arranged between the rear push rod 7 and the front push rod. Ball bearings can also be used as the connection between the front push rod and the rear push rod, so that the abrasion before the push rod is reduced. However, the ball bearing generally needs to be added with lubricating oil, and if the lubricating oil overflows, pollution is formed on the electric contact, so that the electric contact has the problem of excessively high resistance. A non-dielectric slip-fit configuration is therefore preferred.
In this embodiment, the rotary driving motor 11 is fixed on the motor bracket 13 by adopting the motor fixing screw 12, so as to respectively fix four directions of the servo motor, thereby avoiding the swing caused by the servo in operation and affecting the precision of the movement of the electrical contact push rod.
The structure of buckle formula can also be adopted, with servo motor card on the motor support, the quick dismantlement of being convenient for. The screw-fixed assembly structure in the preferred scheme can ensure the unstable condition caused by the abrasion of parts of the servo motor after long-time operation.
The rear push rod 7 and the motor connecting rod 9 are made of stainless steel, so that the wear resistance of the push rod during operation is improved, and the service life is prolonged.
As shown in fig. 6, the front end of the front push rod 5 is an arc groove matched with the outer edge of the head of the rivet-shaped electric contact 3, and the front end of the front push rod 5 moves back and forth corresponding to the position of the head of the rivet-shaped electric contact 3 so as to touch the head of the rivet-shaped electric contact 3.
When the rivet-type electric contact demoulding device is adopted for demoulding operation, as shown in fig. 2-5, when the motor rotary rod 10 is rotated by the output of the rotary driving motor 11, the motor connecting rod 9 rotates anticlockwise from the position of fig. 1, the front push rod 5 pushes the rivet-type electric contact 3 to the position of fig. 3, the front push rod 5 contacts the rivet-type electric contact 3 with small external force to demould the rivet-type electric contact 3, then rotates anticlockwise, the front push rod 5 retreats to the position of fig. 5 (also the initial position of fig. 1), enough space is reserved for cold heading forming of the electric contact, and reciprocating motion is realized, so that sustainable production demoulding of the rivet-type electric contact 3 is realized. The rotary driving motor 11 drives the front push rod 5 to reciprocate in a continuous operation mode, as shown in fig. 7, the electric contact push rod is retracted after touching the head of the rivet-type electric contact 3.
Example 2:
The present embodiment is substantially the same as embodiment 1 in structure, except that: as shown in fig. 8, the front end of the front push rod 5 is provided with a groove with a width larger than the foot of the rivet-type electrical contact 3 and smaller than the head of the rivet-type electrical contact 3, and the front end of the front push rod 5 moves back and forth corresponding to the foot of the rivet-type electrical contact 3 so as to touch the foot of the rivet-type electrical contact 3.
When the rivet-type electrical contact demoulding device of the embodiment is used for demoulding, the rotary driving motor 11 drives the front push rod 5 to reciprocate in an intermittent operation mode, as shown in fig. 9, when the groove at the front end part of the front push rod 5 clamps the foot part of the rivet-type electrical contact 3, the rivet-type electrical contact is stopped, and the rivet-type electrical contact is retracted again when being separated.
Embodiment 1 and embodiment 2 can be selected according to the specification state of the electrical contact, the structure of embodiment 1 is suitable for the product that is easy to be detached, and the product that is not easy to be detached adopts the structure of the front push rod 5 of embodiment 2. The front push rod 5 is preferably exchangeable, so that it can be exchanged according to the specification state of the electrical contact. The method can avoid the risk of appearance defects caused by collision of cutters or other molds when the electric contact is naturally separated, and simultaneously gives stable and consistent collision force when the electric contact is separated, thereby avoiding the appearance defects caused by irregular collision between the electric contact and other parts of the machine body after the electric contact is separated, and further improving the quality of the electric contact.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (6)
1. A rivet type electrical contact demoulding device is characterized in that: the electric die comprises a machine body (1), a forming bottom die (2) and an electric demolding assembly, wherein the forming bottom die (2) is arranged on the machine body (1) and is used for forming a rivet-shaped electric contact (3);
The electric demolding assembly comprises a motor bracket (13) fixed on a machine body (1), a rotary driving motor (11) fixed on the motor bracket (13), a motor connecting rod (9) connected with a motor rotating rod (10) of the rotary driving motor (11), a rear push rod (7) hinged with the outer end part of the motor connecting rod (9), and a front push rod (5) hinged with the end part of the rear push rod (7) far away from the motor rotating rod (10), wherein a push rod fixing buckle (4) is fixed on the machine body (1), the front push rod (5) penetrates through the push rod fixing buckle (4), and the rotary driving motor (11) drives the front push rod (5) to do reciprocating motion through the motor rotating rod (10), the motor connecting rod (9) and the rear push rod (7) so that the front push rod (5) is close to a forming bottom die (2) and then touches a rivet type electric contact (3) formed by the forming bottom die (2) to demold and far away from the forming bottom die (2);
when the rivet-type electric contact (3) is easy to be demolded, the front end part of the front push rod (5) is an arc-shaped groove matched with the outer edge of the head part of the corresponding rivet-type electric contact (3), and the front end part of the front push rod (5) moves back and forth to touch the head part of the rivet-type electric contact (3) correspondingly;
When the rivet type electric contact (3) is not easy to be demolded, a groove with the width being larger than the foot part of the rivet type electric contact (3) and smaller than the head part of the rivet type electric contact (3) is formed in the front end part of the front push rod (5), and the front end part of the front push rod (5) moves back and forth at the position corresponding to the foot part of the rivet type electric contact (3) so that the foot part of the rivet type electric contact (3) can be touched.
2. The rivet-type electrical contact stripper of claim 1, wherein: the push rod fixing buckle (4) is made of stainless steel, and the part of the front push rod (5) contacted with the push rod fixing buckle (4) is made of brass.
3. The rivet-type electrical contact stripper of claim 1, wherein: the end part of the front push rod (5) used for touching the rivet type electric contact (3) is made of pure silver.
4. The rivet-type electrical contact stripper of claim 1, wherein: the rotary driving motor (11) is a servo motor or a stepping motor.
5. The rivet-type electrical contact stripper of claim 1, wherein: the rear push rod (7) is connected with the front push rod (5) by a push rod connecting shaft (8), and a medium-free sliding structure is arranged between the rear push rod and the front push rod.
6. A rivet type electric contact demoulding method is characterized in that: which employs the rivet-type electrical contact stripper as defined in claim 1,
When the rivet-type electric contact (3) is easy to be demolded, the rotary driving motor (11) drives the front push rod (5) to make reciprocating motion in a continuous operation mode, and the electric contact push rod is retracted after touching the head of the rivet-type electric contact (3);
When the rivet type electric contact (3) is not easy to be demolded, the rotary driving motor (11) drives the front push rod (5) to do reciprocating motion in an intermittent operation mode, and when the groove at the front end part of the front push rod (5) clamps the foot part of the rivet type electric contact (3), the rivet type electric contact stops, and when the electric contact is separated, the rivet type electric contact is retracted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210016503.2A CN114535489B (en) | 2022-01-07 | 2022-01-07 | Rivet type electric contact demoulding device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210016503.2A CN114535489B (en) | 2022-01-07 | 2022-01-07 | Rivet type electric contact demoulding device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114535489A CN114535489A (en) | 2022-05-27 |
| CN114535489B true CN114535489B (en) | 2024-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210016503.2A Active CN114535489B (en) | 2022-01-07 | 2022-01-07 | Rivet type electric contact demoulding device and method |
Country Status (1)
| Country | Link |
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| CN (1) | CN114535489B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB568013A (en) * | 1943-04-19 | 1945-03-14 | Carl William Cherry | Rivets and method and apparatus for making the same |
| US3938208A (en) * | 1974-08-15 | 1976-02-17 | Yuan Ho Lee | Knockout mechanism for a high-speed automatic cold heading machine |
| US5099672A (en) * | 1989-11-09 | 1992-03-31 | Hatebur Umformmaschinen Ag | Forming press |
| US5542276A (en) * | 1992-03-03 | 1996-08-06 | Enkotec A/S | Method and an apparatus for ejecting an elongate blank from a die |
| JP2002102992A (en) * | 2000-09-29 | 2002-04-09 | Kurimoto Ltd | Lower knock out device |
| KR20040038528A (en) * | 2002-11-01 | 2004-05-08 | 주식회사 한빛화스너 | Apparatus for forming a stepped portion on an enlarged rivet |
| CN104722700A (en) * | 2013-12-18 | 2015-06-24 | 北汽福田汽车股份有限公司 | Rivet disassembly device |
| CN206326482U (en) * | 2016-12-05 | 2017-07-14 | 中航（重庆）微电子有限公司 | Grinding cavit and target polishing cleaning machine |
| CN209288194U (en) * | 2018-11-02 | 2019-08-23 | 思进智能成形装备股份有限公司 | Cold headers material removing mechanism |
| CN210254043U (en) * | 2019-05-28 | 2020-04-07 | 福达合金材料股份有限公司 | Thick silver layer mould of rivet type electrical contact shaping |
| CN112222315A (en) * | 2020-08-25 | 2021-01-15 | 合肥常青机械股份有限公司 | Multi-station stamping die with delay ejection mechanism |
| CN213211999U (en) * | 2020-07-10 | 2021-05-14 | 温州汇丰合金科技有限公司 | Electrical contact molding pushing structure of cold-press welding composite contact automaton |
| CN213763885U (en) * | 2020-10-10 | 2021-07-23 | 南通市敦强紧固件制造有限公司 | Guide rail screw forging forming stripping device |
-
2022
- 2022-01-07 CN CN202210016503.2A patent/CN114535489B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB568013A (en) * | 1943-04-19 | 1945-03-14 | Carl William Cherry | Rivets and method and apparatus for making the same |
| US3938208A (en) * | 1974-08-15 | 1976-02-17 | Yuan Ho Lee | Knockout mechanism for a high-speed automatic cold heading machine |
| US5099672A (en) * | 1989-11-09 | 1992-03-31 | Hatebur Umformmaschinen Ag | Forming press |
| US5542276A (en) * | 1992-03-03 | 1996-08-06 | Enkotec A/S | Method and an apparatus for ejecting an elongate blank from a die |
| JP2002102992A (en) * | 2000-09-29 | 2002-04-09 | Kurimoto Ltd | Lower knock out device |
| KR20040038528A (en) * | 2002-11-01 | 2004-05-08 | 주식회사 한빛화스너 | Apparatus for forming a stepped portion on an enlarged rivet |
| CN104722700A (en) * | 2013-12-18 | 2015-06-24 | 北汽福田汽车股份有限公司 | Rivet disassembly device |
| CN206326482U (en) * | 2016-12-05 | 2017-07-14 | 中航（重庆）微电子有限公司 | Grinding cavit and target polishing cleaning machine |
| CN209288194U (en) * | 2018-11-02 | 2019-08-23 | 思进智能成形装备股份有限公司 | Cold headers material removing mechanism |
| CN210254043U (en) * | 2019-05-28 | 2020-04-07 | 福达合金材料股份有限公司 | Thick silver layer mould of rivet type electrical contact shaping |
| CN213211999U (en) * | 2020-07-10 | 2021-05-14 | 温州汇丰合金科技有限公司 | Electrical contact molding pushing structure of cold-press welding composite contact automaton |
| CN112222315A (en) * | 2020-08-25 | 2021-01-15 | 合肥常青机械股份有限公司 | Multi-station stamping die with delay ejection mechanism |
| CN213763885U (en) * | 2020-10-10 | 2021-07-23 | 南通市敦强紧固件制造有限公司 | Guide rail screw forging forming stripping device |
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| Publication number | Publication date |
|---|---|
| CN114535489A (en) | 2022-05-27 |
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