CN111531100A - Novel three-punch type cold heading rivet contact processing method - Google Patents
Novel three-punch type cold heading rivet contact processing method Download PDFInfo
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- CN111531100A CN111531100A CN202010387674.7A CN202010387674A CN111531100A CN 111531100 A CN111531100 A CN 111531100A CN 202010387674 A CN202010387674 A CN 202010387674A CN 111531100 A CN111531100 A CN 111531100A
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- contact
- die head
- upsetting
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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
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
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- Mechanical Engineering (AREA)
- Manufacture Of Switches (AREA)
Abstract
The invention relates to a novel processing method of a three-punch type cold heading rivet contact, which comprises the following steps: cutting materials, namely cutting the noble metal layer and the base metal layer, cutting the noble metal layer into a contact with a proper length, and cutting the base metal layer into a substrate with a proper length; placing materials, namely sequentially placing the base body and the contact into the through hole of the bottom die by a feeding device, and keeping the base body and the contact in the through hole by a bottom thimble below the bottom die; and step three, performing cold heading and pressure welding molding, and performing three-time pressure welding on the material in the through hole of the bottom die by using a cold header to form a finished product. Through three towards shaping, it is linear type distribution to appear when making silver-colored line combine with the copper line to ensure the thickness of rivet type contact edge silver layer, avoided because of the not enough of edge silver layer, cause the early failure of electrical equipment in the use.
Description
Technical Field
The invention relates to the technical field of rivet contact preparation, in particular to a novel processing method of a three-punch type cold heading rivet contact.
Background
Silver contacts, also known as rivet contacts, have been widely used in electrical switch circuit contact components, such as circuit breakers, thermostats, relays, and other products. The on-off contact has high requirements on current, and the low quality of the contact can influence conductive resistance to cause the product to generate heat, thereby influencing the practical safety and the service life of the product. The electrical performance of the rivet contact is mainly determined by the performance of the working layer (silver alloy material layer), so the electrical performance of the rivet contact is directly influenced by the distribution of the working layer. The processing of working layer to rivet contact among the prior art generally adopts compound rivet to electrocute, mainly adopts two kinds of technologies in the course of working of compound rivet electrocute, one kind is high temperature brazing, one kind is cold heading pressure welding, but high temperature brazing makes the product surface produce the oxide layer in the course of working, and then has improved the processing degree of difficulty of product, so generally adopt cold heading pressure welding technology.
The rivet electric shock working layer of the traditional cold heading process processing part is distributed in a pot bottom shape, the silver layer at the edge of the working layer is thin, the rivet contact can cause melting, evaporation and consumption of the working layer due to discharge in the using process, and the thin edge of the working layer can be gradually consumed until the rivet contact is exposed, so that the electrical equipment is easily failed in advance in the using process.
Disclosure of Invention
The invention aims to solve the problems and provides a method and a device for processing a three-punch cold heading rivet contact, which ensure the thickness of an edge silver layer of a rivet contact and avoid the early failure of electrical equipment in the using process due to the deficiency of the edge silver layer.
In order to achieve the purpose, the invention provides the following technical scheme: a novel processing method of a three-punch cold heading rivet contact comprises the following steps:
cutting materials, namely cutting the noble metal layer and the base metal layer, cutting the noble metal layer into a contact with a proper length, and cutting the base metal layer into a substrate with a proper length;
placing materials, namely sequentially placing the base body and the contact into the through hole of the bottom die by a feeding device, and keeping the base body and the contact in the through hole by a bottom thimble below the bottom die;
and step three, performing cold heading and pressure welding molding, and performing three-time pressure welding on the material in the through hole of the bottom die by using a cold header to form a finished product.
The invention further provides that: in the first step, the noble metal layer is a silver metal alloy material layer or a silver metal oxide material layer.
The invention further provides that: in the first step, the metal layer is a pure copper material layer or a copper alloy material layer.
The invention further provides that: the third step comprises the following steps:
step one, pre-upsetting, namely ejecting the contact and the base body towards the top of the through hole by a bottom ejector pin below a bottom die, and performing pressure welding on the contact and the base body by a pre-upsetting die head of a cold header to ensure that the contact and the base body are combined in a deformation mode and form a composite cylinder with a spherical end part;
step two, performing primary upsetting forming, returning and resetting a pre-upsetting die head, and performing secondary pressure welding on the composite cylinder with the spherical end part by using two die heads on the cold header so as to preliminarily form the composite cylinder;
step three, final upsetting forming, returning and resetting a secondary punching die head, pressing down a forming die head on a cold header to perform final upsetting on the composite column, and forming a rivet contact through final upsetting;
the invention further provides that: the stamping speed of the pre-upsetting die head, the secondary stamping die head and the forming die head is 2mm s < -1 >.
The invention further provides that: in the step one, the pressure value of the pre-upsetting die head is 1000-2000 MPa, and the upsetting time is 0.1-0.6 s.
The invention further provides that: in the second substep, the fillet alpha at the inlet of the female die of the second punching die head is R4 mm.
The invention further provides that: in the step two, the pressure value of the secondary punching die head is 2000-2500 MPa, and the upsetting time is 0.1-0.6 s.
The invention further provides that: in the third substep, the side wall taper angle β of the forming die head was 15 °, and the friction factor was 0.10.
The invention further provides that: in the step three, the pressure value of the forming die head is 2000-2500 MPa, and the heading time is 0.1-0.6 s.
By adopting the technical scheme, the material is upset into a spherical shape step by step and step one, the rivet-shaped contact is preliminarily formed step by step two, so that the silver wire and the copper wire are upset into linear distribution, the defect of pot bottom-shaped distribution of a rivet-shaped contact working layer is overcome, and the external dimension of the contact end part of the composite column is upset and formed step by step three, so that the requirements of customer products are met. Through three towards shaping, it is linear type distribution to appear when making silver-colored line combine with the copper line to ensure the thickness of rivet type contact edge silver layer, avoided because of the not enough of edge silver layer, cause the early failure of electrical equipment in the use.
The invention is further described with reference to the following drawings and detailed description.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic diagram illustrating deformation of the composite post during the pressure welding process in step two according to the embodiment of the present invention;
FIG. 4 is a schematic stepwise illustration of a silver layer of a prior art product according to an embodiment of the present invention;
FIG. 5 is a schematic view of a silver layer of a product produced by the method of the present invention in steps according to an embodiment of the present invention;
the reference numbers in the figures mean: the device comprises a feeding device-1, a bottom die-11, a through hole-12, a bottom thimble-13, a contact-21, a substrate-22, a pre-upsetting die head-31, a secondary punching die head-32 and a forming die head-33.
Detailed Description
The present embodiment is only an explanation of the present embodiment, and it is not a limitation of the present embodiment, and a person skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present embodiment.
Referring to fig. 1-5, the present embodiment discloses a novel method for processing a three-punch cold-heading rivet contact 21, which comprises the following steps:
cutting materials, namely cutting a noble metal layer and a base metal layer, cutting the noble metal layer into a contact 21 with a proper length, and cutting the base metal layer into a substrate 22 with a proper length;
secondly, discharging, namely sequentially placing the base body 22 and the contact 21 into the through hole 12 of the bottom die 11 by the feeding device 1, and keeping the base body 22 and the contact 21 in the through hole 12 by a bottom ejector pin 13 below the bottom die 11;
and step three, performing cold heading and pressure welding forming, and performing three-time pressure welding on the material in the through hole 12 of the bottom die 11 by using a cold header to form a finished product.
The embodiment further provides that: in the first step, the noble metal layer is a silver metal alloy material layer or a silver metal oxide material layer.
The embodiment further provides that: in the first step, the metal layer is a pure copper material layer or a copper alloy material layer.
The embodiment further provides that: the third step comprises the following steps:
step one, pre-upsetting, namely ejecting the contact 21 and the substrate 22 towards the top of the through hole 12 by a bottom ejector pin 13 below a bottom die 11, and performing pressure welding on the contact 21 and the substrate 22 by a pre-upsetting die head 31 of a cold header to ensure that the contact 21 and the substrate 22 are deformed and combined to form a composite cylinder with a spherical end part;
step two, performing primary upsetting forming, returning and resetting the pre-upsetting die head 31, and performing secondary pressure welding on the composite cylinder with the spherical end part by using a secondary punching die head 32 on the cold header so as to preliminarily form the composite cylinder;
and step three, final upsetting forming, returning and resetting the secondary punching die head 32, pressing down the forming die head 33 on the cold header to perform final upsetting on the composite column, and forming the rivet contact 21 by final upsetting.
The embodiment further provides that: the punching speed of the pre-heading die head 31, the secondary punching die head 32 and the forming die head 33 is 2mm & s < -1 >.
The embodiment further provides that: in the step one, the pressure value of the pre-upsetting die head 31 is 1000-2000 MPa, and the upsetting time is 0.1-0.6 s.
The embodiment further provides that: in the second substep, the fillet α at the entrance of the female die of the second die head 32 is R4 mm.
The embodiment further provides that: in the step two, the pressure value of the secondary punching die head 32 is 2000-2500 MPa, and the upsetting time is 0.1-0.6 s.
The embodiment further provides that: in the third substep, the side wall taper angle β of the molding die 33 was 15 °, and the friction factor was 0.10.
The invention further provides that: in the third step, the pressure value of the forming die head 33 is 1500-2500 MPa, and the heading time is 0.1-0.6 s.
By adopting the technical scheme, the material is upset into a spherical shape step by step and step one, the rivet-shaped contact is preliminarily formed in step two, so that the silver wire and the copper wire are upset into linear distribution, the defect of pot-bottom-shaped distribution of a rivet-shaped contact working layer is overcome, and the external dimension of the end part of the contact 21 of the composite column is upset and formed in step three, so that the requirements of customer products are met. Through three towards shaping, it is linear type distribution to appear when making silver-colored line combine with the copper line to ensure the thickness of rivet type contact edge silver layer, avoided because of the not enough of edge silver layer, cause the early failure of electrical equipment in the use.
Although the feeder-1, the die-11, the through-hole-12, the bottom pin-13, the contact-21, the base-22, the pre-heading die-31, the two-punch die-32, and the forming die-33 are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present embodiments; they are to be construed as being without limitation to any one of the additional limitations which are within the spirit of the present embodiments.
Claims (10)
1. A novel processing method of a three-punch cold heading rivet contact is characterized in that: the method comprises the following steps:
cutting materials, namely cutting the noble metal layer and the base metal layer, cutting the noble metal layer into a contact with a proper length, and cutting the base metal layer into a substrate with a proper length;
placing materials, namely sequentially placing the base body and the contact into the through hole of the bottom die by a feeding device, and keeping the base body and the contact in the through hole by a bottom thimble below the bottom die;
and step three, performing cold heading and pressure welding molding, and performing three-time pressure welding on the material in the through hole of the bottom die by using a cold header to form a finished product.
2. The novel processing method of the three-punch cold heading rivet contact as claimed in claim 1, wherein: in the first step, the noble metal layer is a silver metal alloy material layer or a silver metal oxide material layer.
3. The novel processing method of the three-punch cold heading rivet contact as claimed in claim 1, wherein: in the first step, the metal layer is a pure copper material layer or a copper alloy material layer.
4. The novel processing method of the three-punch cold heading rivet contact as claimed in claim 1, wherein: the third step comprises the following steps:
step one, pre-upsetting, namely ejecting the contact and the base body towards the top of the through hole by a bottom ejector pin below a bottom die, and performing pressure welding on the contact and the base body by a pre-upsetting die head of a cold header to ensure that the contact and the base body are combined in a deformation mode and form a composite cylinder with a spherical end part;
step two, performing primary upsetting forming, returning and resetting a pre-upsetting die head, and performing secondary pressure welding on the composite cylinder with the spherical end part by using two die heads on the cold header so as to preliminarily form the composite cylinder;
and step three, final upsetting forming, returning and resetting the secondary punching die head, pressing down the forming die head on the cold header to perform final upsetting on the composite column, and forming the rivet contact through final upsetting.
5. The novel processing method of the three-punch cold-heading rivet contact as claimed in claim 4, wherein: the stamping speed of the pre-upsetting die head, the secondary stamping die head and the forming die head is 2mm s-1。
6. The novel processing method of the three-punch cold-heading rivet contact as claimed in claim 4, wherein: in the step one, the pressure value of the pre-upsetting die head is 1000-2000 MPa, and the upsetting time is 0.1-0.6 s.
7. The novel processing method of the three-punch cold-heading rivet contact as claimed in claim 4, wherein: in the second substep, the fillet alpha at the inlet of the female die of the second punching die head is R4 mm.
8. The novel processing method of the three-punch cold-heading rivet contact as claimed in claim 4, wherein: in the step two, the pressure value of the secondary punching die head is 2000-2500 MPa, and the upsetting time is 0.1-0.6 s.
9. The novel processing method of the three-punch cold-heading rivet contact as claimed in claim 4, wherein: in the third substep, the side wall taper angle β of the forming die head was 15 °, and the friction factor was 0.10.
10. The novel processing method of the three-punch cold-heading rivet contact as claimed in claim 4, wherein: and in the step three, the pressure value of the forming die head is 1500-2500 MPa, and the heading time is 0.1-0.6 s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010387674.7A CN111531100B (en) | 2020-05-09 | 2020-05-09 | Novel three-punch type cold heading rivet contact processing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010387674.7A CN111531100B (en) | 2020-05-09 | 2020-05-09 | Novel three-punch type cold heading rivet contact processing method |
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| CN111531100A true CN111531100A (en) | 2020-08-14 |
| CN111531100B CN111531100B (en) | 2022-02-15 |
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| CN202010387674.7A Active CN111531100B (en) | 2020-05-09 | 2020-05-09 | Novel three-punch type cold heading rivet contact processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743024A (en) * | 2020-12-15 | 2021-05-04 | 福达合金材料股份有限公司 | Sheet-shaped electrical contact forming device and method |
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| CN101030491A (en) * | 2007-01-11 | 2007-09-05 | 陈晓 | Production of triple-layer composite cold-rolling welded rivet contact |
| CN101217075A (en) * | 2007-12-26 | 2008-07-09 | 王益敏 | A compound contact structure and manufacturing technology |
| CN204464106U (en) * | 2015-04-17 | 2015-07-08 | 桂林市森工机械技术开发有限公司 | The equipment of a kind of production two composite rivet formula electrical contacts |
| DE102014218190A1 (en) * | 2014-09-11 | 2016-03-17 | Volkswagen Aktiengesellschaft | A method for producing a solid metal composite component and solid metal composite component produced therewith |
| CN107195495A (en) * | 2017-07-01 | 2017-09-22 | 唐冬香 | A kind of compound electrical contact producing device with haulage gear |
| CN209174812U (en) * | 2018-10-23 | 2019-07-30 | 福达合金材料股份有限公司 | Rivet type electrical contact forms thick nail pin mold |
| 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 |
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2020
- 2020-05-09 CN CN202010387674.7A patent/CN111531100B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101030491A (en) * | 2007-01-11 | 2007-09-05 | 陈晓 | Production of triple-layer composite cold-rolling welded rivet contact |
| CN101217075A (en) * | 2007-12-26 | 2008-07-09 | 王益敏 | A compound contact structure and manufacturing technology |
| DE102014218190A1 (en) * | 2014-09-11 | 2016-03-17 | Volkswagen Aktiengesellschaft | A method for producing a solid metal composite component and solid metal composite component produced therewith |
| CN204464106U (en) * | 2015-04-17 | 2015-07-08 | 桂林市森工机械技术开发有限公司 | The equipment of a kind of production two composite rivet formula electrical contacts |
| CN107195495A (en) * | 2017-07-01 | 2017-09-22 | 唐冬香 | A kind of compound electrical contact producing device with haulage gear |
| CN209174812U (en) * | 2018-10-23 | 2019-07-30 | 福达合金材料股份有限公司 | Rivet type electrical contact forms thick nail pin mold |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743024A (en) * | 2020-12-15 | 2021-05-04 | 福达合金材料股份有限公司 | Sheet-shaped electrical contact forming device and method |
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| CN111531100B (en) | 2022-02-15 |
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