CN111223690A - High-strength high-conductivity spring contact finger and preparation process thereof - Google Patents
High-strength high-conductivity spring contact finger and preparation process thereof Download PDFInfo
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- CN111223690A CN111223690A CN201911114149.1A CN201911114149A CN111223690A CN 111223690 A CN111223690 A CN 111223690A CN 201911114149 A CN201911114149 A CN 201911114149A CN 111223690 A CN111223690 A CN 111223690A
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- contact finger
- spring contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
- H01H1/44—Contacts characterised by the manner in which co-operating contacts engage by sliding with resilient mounting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
Abstract
The invention discloses a high-strength high-conductivity spring contact finger, which is of a coil spring structure with an elliptical cross section, wherein the long axis of the elliptical cross section is along the axial direction of a coil spring, and the spring contact finger comprises the following components in parts by mass: 90-100 parts of copper, 0.01-0.5 part of zirconium, 0.5-1.5 parts of chromium and 0.1-1 part of rare earth silicon magnesium alloy; wherein the rare earth silicon magnesium alloy comprises rare earth cerium, silicon, titanium, iron and magnesium elements. The spring contact finger has the advantages of good conductivity, high ultimate tensile strength, good rebound resilience, low cost, environmental protection and no pollution, and is easy to machine and form.
Description
Technical Field
The invention relates to the technical field of spring contact finger processing, in particular to a high-strength high-conductivity spring contact finger and a preparation process thereof.
Background
Spring fingers refer to a special spring that can carry high currents in a small space and also can be used as a purely mechanical connection. The spring fingers are adapted for use in a variety of static or dynamic medium to high voltage environments, the size of the spring fingers and the number of independent coil turns make the spring adaptable to a variety of electrical contact designs, and use as an optimal current carrying capability electrical or EMI shield with the most contact points, each coil will compensate for contact and surface variations independently, which allows for wider tolerances between fittings, multiple contact points increase electrical conductivity, and longer service life. At present, the spring contact finger is widely applied to power supply contact in various industries, including medical electronics, medical instruments, aerospace, energy sources, automobiles and the like.
The spring contact finger has higher requirements on strength, elasticity and conductivity, the spring contact finger material at present mainly selects high-quality beryllium bronze or copper chromium zirconium alloy, the beryllium bronze is a colored alloy elastic material with excellent comprehensive performance and is divided into a high-strength type and a high-conductivity type, the high-strength type beryllium bronze has higher strength and lower conductivity, the high-strength type beryllium bronze can meet the requirements of the prepared spring contact finger, the high-strength type beryllium bronze has high strength and high heat resistance after heat treatment, but the conductivity of the high-strength type beryllium bronze cannot meet the requirements, and the beryllium in the high-strength type beryllium bronze is a metal element which pollutes the environment and is carcinogenic, so the production cost is higher; the existing copper chromium zirconium alloy has both high conductivity and certain strength, is an electrical aging strengthening type alloy, but the copper chromium zirconium alloy has lower elasticity, and when the temperature is higher than 560 ℃, the strength is reduced rapidly, and the thermal stability is poor.
Therefore, there is a need to develop a spring contact finger with high ultimate tensile strength, high conductivity, good resilience, low cost, environmental protection and no pollution to meet the market demand.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a high-strength high-conductivity spring contact finger which has the advantages of good conductivity, high ultimate tensile strength, good rebound resilience, low cost, environmental protection and no pollution, and is easy to process and form. In addition, the invention also provides a preparation process of the high-strength high-conductivity spring contact finger.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, a high-strength and high-conductivity spring contact finger is provided, where the spring contact finger is a coil spring structure having an elliptical cross section, a long axis of the elliptical cross section is along an axial direction of the coil spring, and the spring contact finger includes the following components in parts by mass: 90-100 parts of copper, 0.01-0.5 part of zirconium, 0.5-1.5 parts of chromium and 0.1-1 part of rare earth silicon magnesium alloy; wherein the rare earth silicon magnesium alloy comprises rare earth cerium, silicon, titanium, iron and magnesium elements.
Preferably, the rare earth silicon-magnesium alloy comprises the following components in percentage by mass: 0.3 to 0.5 percent of rare earth cerium, 0.01 to 0.15 percent of silicon, 0.05 to 0.5 percent of titanium, 0.05 to 0.5 percent of iron and the balance of magnesium.
The rare earth cerium in the rare earth silicon magnesium alloy enables the spring contact finger to have high temperature resistance and excellent corrosion resistance, the silicon can improve the elastic limit, yield point and tensile strength of the spring contact finger, and strengthening phases are formed among the high-melting-point silicon, titanium and iron metal elements, copper, zirconium and chromium, so that the strength, elastic performance and thermal stability of the spring contact finger are fully improved.
Preferably, the tensile strength of the spring contact finger wire is 580-700MPa, the electric conductivity is 72-86% IACS, and the hardness is 150-170 HV.
In a second aspect of the present invention, a preparation process of the above high-strength high-conductivity spring contact finger is provided, which includes the following steps:
s1, carrying out vacuum melting, heat preservation and cooling on the copper, zirconium, chromium and rare earth silicon-magnesium alloy according to a corresponding proportion, and then processing to obtain a spring contact finger bar material, wherein the diameter of the spring contact finger bar material is 20-38 mm;
s2, subjecting the spring contact finger rod material prepared in the step S1 to multi-pass continuous drawing treatment, then carrying out solution treatment and aging treatment to obtain a spring contact finger wire rod with a target diameter, wherein the diameter of the spring contact finger wire rod is 0.15-3 mm;
s3, performing spring winding treatment on the spring contact finger wire rod prepared in the step S2 by using a spring winding machine according to parameters of a finished product to obtain an open semi-finished product inclined coil spring;
and S4, welding the two ends of the semi-finished oblique coil spring obtained by winding in the step S3 together to form a closed annular spring, then carrying out stress relief heat treatment, and carrying out plating treatment on the surface of the spring after the stress relief heat treatment to form a metal plating layer, thus obtaining the finished spring contact finger product. The welding can be carried out by electron beam, laser or argon arc welding.
Preferably, in step S1, the vacuum melting process is: in trueThe void degree is 6.0 multiplied by 10-2Pa, at the temperature of 1300-1360 ℃, adding copper into a vacuum furnace to be completely melted, then adding chromium and zirconium, controlling the temperature at 1450-1500 ℃ until the copper is completely melted, then adding rare earth silicon magnesium alloy, controlling the temperature at 1600-1700 ℃, and preserving heat for 1-2 h.
Preferably, in step S2, the solution treatment process includes: heating the spring contact finger wire rod obtained by drawing treatment to 950-1000 ℃, preserving heat for 2-4h, and then carrying out quenching treatment at the temperature of 0-10 ℃; the aging treatment process comprises the following steps: and (3) heating the quenched spring contact finger wire to 500-600 ℃, preserving the heat for 4-6h, and then cooling the wire to room temperature along with the furnace. The spring contact finger wire is subjected to solid solution treatment and aging treatment, so that the strength and the conductivity of the spring contact finger wire are further improved.
Preferably, in step S2, the surface of the spring finger wire after aging is polished to form a smooth metal surface.
Preferably, in the step S4, the metal plating layer is nickel plating, silver plating, or gold plating. The silver plating layer is suitable for the fields with higher requirements on conductivity and corrosion resistance; the gold plating layer is a common surface treatment method in electronic products, and can improve the contact performance and the corrosion resistance; nickel is the most important metal to be electroplated because it has outstanding chemical and physical properties, high surface gloss, high corrosion resistance and ductility, and smooth surface.
Preferably, in the step S4, the stress relief heat treatment is performed in a vacuum furnace at a temperature of 200-400 ℃ for a holding time of 2-6 h. Compared with the prior art, the invention has the following beneficial effects:
the spring contact finger is of a coil spring structure with an oval cross section, the long axis of the oval cross section is along the axial direction of the coil spring, so that a large contact surface and a small contact resistance are ensured between the spring contact finger and a rigid contact finger of a static contact head, and meanwhile, the spring contact finger is made of copper, zirconium, chromium and rare earth silicon magnesium alloy. By adopting the preparation process, the utilization rate of the material is higher, the obtained spring contact finger has uniform tissue distribution, no segregation of the material, excellent comprehensive performance and stable product quality.
Drawings
The invention is described in further detail below with reference to specific embodiments and with reference to the following drawings.
FIG. 1 is a schematic view of a spring finger according to the present invention;
FIG. 2 is a flow chart of a process for manufacturing a spring finger according to the present invention.
Detailed Description
Example 1
In this embodiment, the spring contact finger is a coil spring structure having an elliptical cross section, a long axis of the elliptical cross section is along an axial direction of the coil spring (as shown in fig. 1), and the spring contact finger includes the following components in parts by mass: 96 parts of copper, 0.1 part of zirconium, 1.2 parts of chromium and 1 part of rare earth silicon magnesium alloy; wherein the rare earth silicon-magnesium alloy comprises the following components in percentage by mass: 0.3% of rare earth cerium, 0.1% of silicon, 0.2% of titanium, 0.5% of iron and the balance of magnesium.
As shown in fig. 2, the preparation process of the spring contact finger of the invention comprises the following steps:
s1, vacuum degree of 6.0X 10-2Pa, under the condition that the temperature is 1360 ℃, putting copper into a graphite crucible, putting the graphite crucible into a vacuum furnace to be completely melted, adding chromium and zirconium into the graphite crucible, controlling the temperature at 1450 ℃ until the copper is completely melted, adding rare earth silicon magnesium alloy, controlling the temperature at 1650 ℃, preserving the heat for 2h, cooling, and processing to obtain a spring contact finger bar stock, wherein the diameter of the spring contact finger bar stock is 32 mm;
s2, subjecting the spring contact finger rod material prepared in the step S1 to multi-pass continuous drawing treatment, then heating the spring contact finger rod material obtained through drawing treatment to 950 ℃ through solution treatment, preserving heat for 4 hours, then quenching at the temperature of 0 ℃, then heating the spring contact finger rod material obtained through quenching treatment to 600 ℃ again through aging treatment, preserving heat for 4 hours, then cooling to room temperature along with a furnace to obtain a spring contact finger rod material with a target diameter, wherein the diameter of the spring contact finger rod material is 0.3mm, and then polishing the surface of the spring contact finger rod material to form a smooth metal surface;
s3, performing spring winding treatment on the spring contact finger wire rod prepared in the step S2 by using a spring winding machine according to parameters of a finished product to obtain an open semi-finished product inclined coil spring;
and S4, welding the two ends of the semi-finished oblique coil spring obtained by winding in the step S3 together to form a closed annular spring, then carrying out stress relief heat treatment, and carrying out plating treatment on the surface of the spring after the stress relief heat treatment to form a metal plating layer, thus obtaining the finished spring contact finger product. Wherein, the stress relief heat treatment is carried out in a vacuum furnace at the temperature of 200 ℃ for 6 h.
The test shows that the ultimate tensile strength of the spring contact finger prepared in the embodiment reaches 580-600MPa, the conductivity is 82% IACS, and the hardness is 150-170 HV.
Example 2
In this embodiment, the spring contact finger is a coil spring structure having an elliptical cross section, a long axis of the elliptical cross section is along an axial direction of the coil spring (as shown in fig. 1), and the spring contact finger includes the following components in parts by mass: 90 parts of copper, 0.5 part of zirconium, 1.5 parts of chromium and 0.1 part of rare earth silicon magnesium alloy; wherein the rare earth silicon-magnesium alloy comprises the following components in percentage by mass: 0.5% of rare earth cerium, 0.01% of silicon, 0.5% of titanium, 0.05% of iron and the balance of magnesium.
As shown in fig. 2, the preparation process of the spring contact finger of the invention comprises the following steps:
s1, vacuum degree of 6.0X 10-2Pa, placing copper into a graphite crucible under the condition that the temperature is 1300 ℃, then placing the graphite crucible into a vacuum furnace to be completely melted, adding chromium and zirconium into the graphite crucible, controlling the temperature to be 1500 ℃, adding rare earth silicon-magnesium alloy until the copper is completely melted, controlling the temperature to be 1700 ℃, preserving the heat for 1h, cooling, and then processing to obtain a spring contact finger bar stock, wherein the diameter of the spring contact finger bar stock is 38 mm;
s2, subjecting the spring contact finger rod material prepared in the step S1 to multi-pass continuous drawing treatment, then heating the spring contact finger rod material obtained through drawing treatment to 1000 ℃ through solution treatment, preserving heat for 2 hours, then quenching at 10 ℃, then heating the spring contact finger rod material obtained through quenching treatment to 600 ℃ again through aging treatment, preserving heat for 4 hours, then cooling to room temperature along with a furnace to obtain a spring contact finger rod material with a target diameter, wherein the diameter of the spring contact finger rod material is 0.4mm, and then polishing the surface of the spring contact finger rod material to form a smooth metal surface;
s3, performing spring winding treatment on the spring contact finger wire rod prepared in the step S2 by using a spring winding machine according to parameters of a finished product to obtain an open semi-finished product inclined coil spring;
and S4, welding the two ends of the semi-finished oblique coil spring obtained by winding in the step S3 together to form a closed annular spring, then carrying out stress relief heat treatment, and carrying out plating treatment on the surface of the spring after the stress relief heat treatment to form a metal plating layer, thus obtaining the finished spring contact finger product. Wherein, the stress relief heat treatment is carried out in a vacuum furnace at the temperature of 250 ℃ for 4 h.
The test shows that the ultimate tensile strength of the spring contact finger prepared in the embodiment reaches 595MPa, the electric conductivity is 83% IACS, and the hardness is 150-170 HV.
Example 3
In this embodiment, the spring contact finger is a coil spring structure having an elliptical cross section, a long axis of the elliptical cross section is along an axial direction of the coil spring (as shown in fig. 1), and the spring contact finger includes the following components in parts by mass: 100 parts of copper, 0.01 part of zirconium, 0.5 part of chromium and 0.4 part of rare earth silicon magnesium alloy; wherein the rare earth silicon-magnesium alloy comprises the following components in percentage by mass: 0.4% of rare earth cerium, 0.15% of silicon, 0.05% of titanium, 0.2% of iron and the balance of magnesium.
As shown in fig. 2, the preparation process of the spring contact finger of the invention comprises the following steps:
s1, vacuum degree of 6.0X 10-2Pa, under the condition that the temperature is 1320 ℃, putting copper into a graphite crucible, putting the graphite crucible into a vacuum furnace to be completely melted, adding chromium and zirconium into the graphite crucible, controlling the temperature to be 1500 ℃, adding rare earth silicon magnesium alloy until the copper is completely melted, controlling the temperature to be 1600 ℃, preserving the heat for 2 hours, cooling, and processing to obtain a spring contact finger bar stock, wherein the diameter of the spring contact finger bar stock is 20 mm;
s2, subjecting the spring contact finger rod material prepared in the step S1 to multi-pass continuous drawing treatment, then heating the spring contact finger rod material obtained through drawing treatment to 1000 ℃ through solution treatment, preserving heat for 2 hours, then quenching at 10 ℃, then heating the spring contact finger rod material obtained through quenching treatment to 500 ℃ again through aging treatment, preserving heat for 6 hours, then cooling to room temperature along with a furnace to obtain a spring contact finger rod material with a target diameter, wherein the diameter of the spring contact finger rod material is 0.5mm, and then polishing the surface of the spring contact finger rod material to form a smooth metal surface;
s3, performing spring winding treatment on the spring contact finger wire rod prepared in the step S2 by using a spring winding machine according to parameters of a finished product to obtain an open semi-finished product inclined coil spring;
and S4, welding the two ends of the semi-finished oblique coil spring obtained by winding in the step S3 together to form a closed annular spring, then carrying out stress relief heat treatment, and carrying out plating treatment on the surface of the spring after the stress relief heat treatment to form a metal plating layer, thus obtaining the finished spring contact finger product. Wherein, the stress relief heat treatment is carried out in a vacuum furnace at the temperature of 300 ℃ for 2 h;
the test shows that the ultimate tensile strength of the spring contact finger prepared in the embodiment reaches 580MPa, the electric conductivity is 86% IACS, and the hardness is 150-170 HV.
The spring contact finger is of a coil spring structure with an oval cross section, the long axis of the oval cross section is along the axial direction of the coil spring, so that a large contact surface and a small contact resistance are ensured between the spring contact finger and a rigid contact finger of a static contact head, and meanwhile, the spring contact finger is made of copper, zirconium, chromium and rare earth silicon magnesium alloy. By adopting the preparation process, the utilization rate of the material is higher, the obtained spring contact finger has uniform tissue distribution, no segregation of the material, excellent comprehensive performance and stable product quality.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. The high-strength high-conductivity spring contact finger is characterized in that the spring contact finger is of a coil spring structure with an oval cross section, the long axis of the oval cross section is along the axial direction of a coil spring, and the spring contact finger comprises the following components in parts by mass: 90-100 parts of copper, 0.01-0.5 part of zirconium, 0.5-1.5 parts of chromium and 0.1-1 part of rare earth silicon magnesium alloy; wherein the rare earth silicon magnesium alloy comprises rare earth cerium, silicon, titanium, iron and magnesium elements.
2. The high-strength high-conductivity spring contact finger according to claim 1, wherein the rare earth silicon magnesium alloy comprises the following components in percentage by mass: 0.3 to 0.5 percent of rare earth cerium, 0.01 to 0.15 percent of silicon, 0.05 to 0.5 percent of titanium, 0.05 to 0.5 percent of iron and the balance of magnesium.
3. The high strength, high conductivity spring finger of claim 2, wherein the spring finger wire has a tensile strength of 580-700MPa, an electrical conductivity of 72-86% IACS, and a hardness of 150-170 HV.
4. A process for preparing a high strength, high conductivity spring finger as claimed in claim 1, comprising the steps of:
s1, carrying out vacuum melting, heat preservation and cooling on the copper, zirconium, chromium and rare earth silicon-magnesium alloy according to the corresponding proportion, and then processing to obtain a spring contact finger bar material;
s2, subjecting the spring contact finger rod material prepared in the step S1 to multi-pass continuous drawing treatment, and then carrying out solid solution treatment and aging treatment to obtain a spring contact finger wire rod with the target diameter;
s3, performing spring winding treatment on the spring contact finger wire rod prepared in the step S2 by using a spring winding machine according to parameters of a finished product to obtain an open semi-finished product inclined coil spring;
and S4, welding the two ends of the semi-finished oblique coil spring obtained by winding in the step S3 together to form a closed annular spring, then carrying out stress relief heat treatment, and carrying out plating treatment on the surface of the spring after the stress relief heat treatment to form a metal plating layer, thus obtaining the finished spring contact finger product.
5. The process for preparing a high-strength high-conductivity spring contact finger according to claim 4, wherein in the step S1, the vacuum melting process is: under vacuum degree of 6.0X 10-2Pa, at the temperature of 1300-1360 ℃, adding copper into a vacuum furnace to be completely melted, then adding chromium and zirconium, controlling the temperature at 1450-1500 ℃ until the copper is completely melted, then adding rare earth silicon magnesium alloy, controlling the temperature at 1600-1700 ℃, and preserving heat for 1-2 h.
6. The process for preparing a high-strength high-conductivity spring contact finger according to claim 4, wherein in the step S2, the solution treatment process is as follows: heating the spring contact finger wire rod obtained by drawing treatment to 950-1000 ℃, preserving heat for 2-4h, and then carrying out quenching treatment at the temperature of 0-10 ℃; the aging treatment process comprises the following steps: and (3) heating the quenched spring contact finger wire to 500-600 ℃, preserving the heat for 4-6h, and then cooling the wire to room temperature along with the furnace.
7. The process for preparing a spring contact finger with high strength and high conductivity according to claim 6, wherein in step S2, the surface of the spring contact finger wire after aging is polished to form a smooth metal surface.
8. The process for preparing a spring contact finger with high strength and high conductivity according to claim 4, wherein in the step S4, the metal plating is nickel plating, silver plating or gold plating.
9. The process for preparing the spring contact finger with high strength and high conductivity according to claim 4, wherein in the step S4, the stress relief heat treatment is performed in a vacuum furnace at 200-400 ℃ for 2-6 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911114149.1A CN111223690B (en) | 2019-11-14 | 2019-11-14 | High-strength high-conductivity spring contact finger and preparation process thereof |
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| CN201911114149.1A CN111223690B (en) | 2019-11-14 | 2019-11-14 | High-strength high-conductivity spring contact finger and preparation process thereof |
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| CN111223690B CN111223690B (en) | 2022-10-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862509A (en) * | 2021-09-23 | 2021-12-31 | 江阴金湾合金材料有限公司 | High-strength extra-high voltage spring contact finger and processing technology thereof |
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| DE2446698A1 (en) * | 1974-09-30 | 1976-04-08 | Siemens Ag | TWO-LAYER SINTER CONTACT PIECE FOR ELECTRIC SWITCHGEAR |
| US4699763A (en) * | 1986-06-25 | 1987-10-13 | Westinghouse Electric Corp. | Circuit breaker contact containing silver and graphite fibers |
| CN103151187A (en) * | 2013-02-08 | 2013-06-12 | 福州博力达机电有限公司 | Spiral spring contact finger for high-voltage switch and preparation method of spiral spring contact finger |
| CN106086507A (en) * | 2016-06-06 | 2016-11-09 | 中色科技股份有限公司 | A kind of Cu-Cr-Zr alloy for preparing screw-contact and processing technique thereof |
| CN106350697A (en) * | 2016-08-31 | 2017-01-25 | 中国西电集团公司 | High-strength and high-conductivity rare-earth chromium-zirconium-copper spring contact finger and manufacturing method thereof |
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2019
- 2019-11-14 CN CN201911114149.1A patent/CN111223690B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2446698A1 (en) * | 1974-09-30 | 1976-04-08 | Siemens Ag | TWO-LAYER SINTER CONTACT PIECE FOR ELECTRIC SWITCHGEAR |
| US4699763A (en) * | 1986-06-25 | 1987-10-13 | Westinghouse Electric Corp. | Circuit breaker contact containing silver and graphite fibers |
| CN103151187A (en) * | 2013-02-08 | 2013-06-12 | 福州博力达机电有限公司 | Spiral spring contact finger for high-voltage switch and preparation method of spiral spring contact finger |
| CN106086507A (en) * | 2016-06-06 | 2016-11-09 | 中色科技股份有限公司 | A kind of Cu-Cr-Zr alloy for preparing screw-contact and processing technique thereof |
| CN106350697A (en) * | 2016-08-31 | 2017-01-25 | 中国西电集团公司 | High-strength and high-conductivity rare-earth chromium-zirconium-copper spring contact finger and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862509A (en) * | 2021-09-23 | 2021-12-31 | 江阴金湾合金材料有限公司 | High-strength extra-high voltage spring contact finger and processing technology thereof |
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