Copper-steel composite type supporting piece, preparation method thereof and electrical contact assembly

Abstract

The invention provides a copper-steel composite supporting piece, a preparation method thereof and an electrical contact assembly, and the preparation method comprises the steps: providing a copper-steel composite material strip with a single surface compounded with copper, and carrying out the punching molding of the copper-steel composite material strip, so as to obtain a planar copper-steel punching piece; according to the outer contour shape of the copper steel stamping part, the copper part is subjected to stretching treatment, and a copper coating sleeve is obtained; embedding and welding the copper-steel stamping part into the copper coating sleeve to obtain a copper-steel composite flat plate part of which the core part is made of steel and the outer surface is made of a copper material; and the copper-steel composite flat plate piece is machined and formed, and the copper-steel composite supporting piece is obtained. The corrosion and rust resistance of the supporting piece can be effectively improved only through punching, welding and other modes, the machining method is simple, and the yield is high. In addition, electroplating is not needed, an integrated blanking part is adopted, an arc striking accessory is omitted, the production process of the electrical contact assembly can be shortened, the production cost of the electrical contact assembly is effectively reduced, and the production efficiency of the copper-steel composite material and the electrical contact assembly product thereof is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical components, and in particular to a copper-steel composite support member, a preparation method thereof, and an electric contact assembly. Background Art

[0002] Copper-clad steel supports and their electrical contact assemblies have high strength, high plasticity, good electrical conductivity, and the magnetic element Fe in the interlayer can guide the direction of the arc. They are widely used in low-voltage electrical appliances such as circuit breakers and contactors with high current levels. However, conventional copper-clad steel supports are punched out of copper-clad steel materials, and the Fe on the punched section is exposed to the air, which is prone to pitting and rust. The rust blocks fall off, causing the internal mechanism of the electrical appliance to get stuck and fail, and are also easily adsorbed on the electrical contacts, affecting the direction of the arc, thereby affecting the electrical life of the electrical product. For these reasons, some manufacturers use surface silver plating to improve Fe rusting. However, this method has the problem that silver is not easy to electroplate on the surface of the Fe layer.

[0003] After searching, patent CN105161380A discloses a circuit breaker electrical contact support and a preparation method thereof, which uses copper blocks embedded in the side walls of the Cu / Fe / Cu support to replace traditional products. However, the magnetic element Fe contained in the support material is still exposed to the air, bringing the risk of affecting the arc direction and the service life of the electrical appliance.

[0004] Patent CN114864305A uses punching from the thicker copper layer to the thinner copper layer, so that the side wall of the thicker copper layer wraps the Fe of the copper-clad steel middle layer. However, when the iron layer is thicker than the copper layer, the side wall of the copper layer does not completely wrap the Fe layer, so that the Fe in some areas is exposed to the air, and there is still a risk of pitting failure.

[0005] Therefore, it is now necessary to develop a method for preparing a copper-steel composite electrical contact assembly that can effectively prevent rust, so as to solve at least one of the above technical problems. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a copper-steel composite support member, a preparation method thereof, and an electrical contact assembly.

[0007] According to a first aspect of the present invention, there is provided a method for preparing a copper-steel composite support member, comprising:

[0008] Providing a copper-steel composite material strip with copper clad on one side, and punching the copper-steel composite material strip into a shape to obtain a planar copper-steel punching part;

[0009] Providing a copper part, and performing a stretching process on the copper part according to the outer contour shape of the copper-steel stamping part to obtain a copper cladding sleeve;

[0010] The copper-steel punching piece is inlaid and welded into the copper cladding sleeve to obtain a copper-steel composite flat piece with a steel core and a copper outer surface;

[0011] The copper-steel composite flat plate is processed and formed to obtain a copper-steel composite support member.

[0012] Optionally, the copper-steel composite material strip with single-sided copper cladding is provided, wherein: the copper-steel composite material strip comprises a copper layer and a steel layer, and the thickness ratio of the copper layer to the steel layer is (0.05:0.95) to (0.5:0.5).

[0013] Optionally, the material of the copper layer is any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material and dispersion-enhanced copper-based material; the material of the steel layer is any one of iron, iron alloy, stainless steel, carbon steel, silicon steel, structural steel, alloy steel and copper-clad steel.

[0014] Optionally, the copper piece is subjected to a stretching process according to the outer contour shape of the copper-steel stamping piece, comprising:

[0015] According to the outer contour shape of the copper-steel stamping part, the copper part is stretched in a stretching die to form a copper cladding sleeve with an open cavity, and the shape of the open cavity is consistent with the outer contour shape of the copper-steel stamping part.

[0016] Optionally, a copper piece is provided, wherein: the material of the copper piece is any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material and dispersion-enhanced copper-based material.

[0017] Optionally, the copper-steel stamping is inlaid and welded into the copper cladding sleeve, comprising:

[0018] The steel layer of the copper-steel punching piece is placed inward, embedded and welded into the open cavity of the copper cladding sleeve, so as to obtain a copper-steel composite flat plate piece with a steel core and copper on the outer surface.

[0019] Optionally, the copper-steel stamping is inlaid and welded into the copper cladding sleeve, wherein the welding is carried out by any one of soldering, diffusion welding, resistance welding, induction welding, laser welding and ultrasonic welding.

[0020] Optionally, the copper-steel composite flat plate is processed and formed, including: bending the copper-steel composite flat plate with a bending mold, or shaping the copper-steel composite flat plate with a shaping mold to obtain a copper-steel composite support member with a three-dimensional structure.

[0021] According to a second aspect of the present invention, there is provided a copper-steel composite support member, which is prepared using the above-mentioned method for preparing the copper-steel composite support member.

[0022] According to a third aspect of the present invention, there is provided an electric contact assembly, comprising an electric contact and the copper-steel composite support member described above, wherein the electric contact is located on a surface of the copper-steel composite support member.

[0023] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0024] 1. The present invention makes the copper material into a shell and coats the copper-steel material so that the outer surface of the steel material is coated with a layer of copper material, which effectively prevents the Fe element from being exposed to the air and causing pitting and rusting of the material, significantly improving the corrosion resistance of the copper-steel composite support and its electrical products. The processing method is simple, suitable for large-scale production, and has a high yield rate. On the other hand, conventional copper-clad steel electrical contact products usually need to add a silver electroplating process to prevent rust due to the exposure of the Fe element, but the iron layer is not easy to be electroplated with silver, which makes the yield rate of the electrical contact product low; and the material prepared by the present invention can prevent iron from rusting without silver electroplating, which saves the production cost of silver electroplating and shortens the production process, thereby greatly improving the production efficiency and yield rate of the electrical contact assembly.

[0025] 2. The present invention adopts an integrated punching and shaping support member to replace the arc-starting angle of the electrical contact assembly in the prior art, thereby reducing the number of parts of the electrical contact assembly and shortening the production process of the electrical contact assembly, thereby effectively reducing the production cost of the electrical contact assembly and improving the production efficiency of the electrical contact assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 It is a schematic diagram of the structure of the copper-steel punching part and the copper cladding sleeve in one embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a copper-steel composite flat plate after welding in one embodiment of the present invention;

[0029] Figure 3 This is a schematic structural diagram of a copper-steel composite support member in one embodiment of the present invention;

[0030] Figure 4 It is a partial structural schematic diagram of a copper-steel composite support member in one embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of a copper-steel composite electrical contact assembly in one embodiment of the present invention;

[0032] In the figure, the corresponding reference numerals are: 1-copper steel stamping, 2-copper cladding sleeve, 3-copper steel composite flat plate, 4-copper steel composite support, 5-electric contact, 7-copper layer, 8-steel layer. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] It should be noted that in the present application, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present application, and do not specifically refer to any part or element in the present application and should not be understood as limitations on the present application.

[0035] An embodiment of the present invention provides a method for preparing a copper-steel composite support member, comprising the following steps:

[0036] S1. Punching: Provide a copper-steel composite material strip with single-sided copper cladding, that is, a copper layer is provided on one side of the steel layer, and punch the copper-steel composite material strip into a shape to obtain a planar copper-steel punching part 1, such as Figure 1 As shown;

[0037] S2, stretching: provide a copper piece, and perform stretching treatment on the copper piece according to the outer contour shape of the copper-steel punching piece 1 to obtain a copper cladding sleeve 2, such as Figure 1 As shown;

[0038] S3, welding: the copper-steel stamping 1 is embedded and welded into the copper cladding sleeve 2 to obtain a copper-steel composite flat plate 3 with a steel core and a copper outer surface, such as Figure 2 As shown;

[0039] S4, shaping: the copper-steel composite flat plate 3 is processed and shaped to obtain a copper-steel composite support 4, such as Figure 3 and Figure 4 shown.

[0040] In some embodiments, in step S1, the copper-steel composite strip includes a copper layer 7 and a steel layer 8, and the thickness ratio of the two is set according to factors such as the rollable composite performance of two materials with different ductility, the electrical conductivity and corrosion resistance of the composite material, and the material production cost. Preferably, the thickness ratio of the copper layer 7 to the steel layer 8 is (0.05:0.95) to (0.5:0.5), so that the copper-steel composite material has a good composite interface bonding, no wrinkles, no delamination, and the electrical conductivity and corrosion resistance meet the requirements of circuit breaker products.

[0041] Exemplarily, the material of the copper layer 7 is any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material and dispersion-enhanced copper-based material; the material of the steel layer 8 is any one of iron, iron alloy, stainless steel, carbon steel, silicon steel, structural steel, alloy steel and copper-clad steel.

[0042] In some embodiments, in step S2, the copper part is stretched in the stretching die according to the outer contour shape of the copper-steel stamping 1 using an existing stretching die to form a copper cladding sleeve 2 with an open cavity, and the shape of the open cavity is consistent with (i.e., the same as) the outer contour shape of the copper-steel stamping 1, so that in the subsequent process, the copper cladding sleeve 2 can completely cover the planar copper-iron stamping.

[0043] Exemplarily, the material of the copper part is any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material and dispersion-enhanced copper-based material.

[0044] The copper layer 7 and the copper cladding sleeve 2 of the copper-steel punching part 1 are both made of copper material with good electrical conductivity, and the steel layer 8 of the copper-steel punching part 1 is made of high-strength steel material with magnetic elements. The copper layer 7 of the copper-steel punching part 1 and the copper material of the copper cladding sleeve 2 fully cover the steel located in the center of the copper-steel composite support 4, so that the copper-steel composite support 4 and the Fe element of the electrical contact assembly are not exposed to the air, effectively solving the problems of poor corrosion resistance and easy rust of conventional copper-clad steel, thereby improving the service life of electrical products. In addition, the copper-steel composite material also realizes the complementary advantages of copper and steel materials, which not only has the high electrical conductivity, high thermal conductivity and high plasticity of copper materials, but also has the high strength of steel materials, and because it contains the magnetic element Fe, it can guide the direction of the arc, which is conducive to arc extinguishing, making the electrical contact assembly in the electrical appliance more resistant to arc erosion.

[0045] In some embodiments, in step S3, the steel layer 8 of the copper-steel stamping part 1 is inwardly embedded and welded into the open cavity of the copper cladding sleeve 2 to obtain a copper-steel composite flat plate part 3 with a steel core and copper on the outer surface.

[0046] Exemplarily, welding is performed by any one of soldering with solder, diffusion welding, resistance welding, induction welding, laser welding and ultrasonic welding.

[0047] In the above embodiment of the present invention, the copper cladding sleeve 2 and the copper layer 7 of the copper-steel stamping 1 form a sieve to cover the steel layer 8 of the copper-steel stamping 1 in the center of the material, and in order to achieve metallurgical bonding in an air environment, the copper-steel stamping 1 and the copper cladding sleeve 2 are metallurgically bonded together by resistance welding, laser welding or other welding methods.

[0048] In some embodiments, in step S4, a bending die is used to bend the copper-steel composite flat plate 3, or a shaping die is used to shape the copper-steel composite flat plate 3 to obtain a three-dimensional copper-steel composite support 4. This method directly punches and bends the support into an integrated support, and the copper part and the arc-starting part of the support are integrated.

[0049] Another embodiment of the present invention provides a copper-steel composite support member, which is prepared using the above-mentioned method for preparing the copper-steel composite support member, and the support member has good corrosion resistance.

[0050] Another embodiment of the present invention provides an electrical contact assembly, such as Figure 5 As shown, it includes an electric contact 5 and the above-mentioned copper-steel composite support 4, and the electric contact 5 is located on the surface of the copper-steel composite support 4. Specifically, the electric contact 5 is welded to the surface of the copper-steel composite support 4 to obtain the required copper-steel composite electric contact assembly.

[0051] In the above embodiment of the present invention, the finished product is obtained by stretching the copper material into a shell to cover and weld the copper-steel material. Compared with the existing preparation method, the surface of the steel material located in the center of the material is covered with copper material, which effectively prevents the Fe element from being exposed to the air and causing pitting and rusting of the material, and the prepared material has better rust and corrosion resistance. Therefore, the corrosion resistance and service life of the copper-steel composite support and its electrical products prepared by this process are significantly improved.

[0052] The method of the above embodiment of the present invention has a simple processing method, is easy to mass produce, and has a high yield rate. Conventional copper-clad steel electrical contact products usually require an additional silver electroplating process to prevent rust due to the exposure of Fe elements, but the iron layer is not easy to be electroplated with silver, which makes the yield rate of the electrical contact product low. The material prepared in the above embodiment of the present invention can prevent iron from rusting without the need for additional silver electroplating, which can greatly reduce the production cost of the product and shorten the production process, thereby greatly improving the production efficiency and yield rate of the electrical contact assembly, which is beneficial to improving the performance stability of the support and its electrical products.

[0053] In the prior art, the copper-clad steel copper parts and the arc-starting parts at both ends are divided into three parts. The above embodiment of the present invention adopts an integrated punching and shaping support part to replace the arc-starting angle of the electrical contact assembly in the prior art, thereby reducing the number of parts of the electrical contact assembly and shortening the production process of the electrical contact assembly, thereby effectively reducing the production cost of the electrical contact assembly and improving the production efficiency of the electrical contact assembly.

[0054] The scheme of the present application will be explained below in conjunction with specific embodiments and comparative examples. It will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If no specific technology or conditions are indicated in the embodiments, the technology or conditions described in the literature in this area or the product specification are carried out. The reagents used or the instruments that do not indicate the manufacturer are all conventional products that can be obtained through commercial channels.

[0055] Example

[0056] This example was prepared as Figure 1-Figure 5 The electrical contacts shown are Ag / SnO 2 , a Cu-Fe composite electrical contact assembly, comprising the following steps:

[0057] S1: a copper-steel composite strip of Cu / 1008 steel with single-sided copper cladding is punched into a shape to obtain a planar Cu / 1008 steel punched part, wherein the thickness ratio of the Cu layer to the 1008 steel layer is 0.3:0.7.

[0058] S2: According to the outer contour shape of the Cu / 1008 steel stamping obtained in S1, the T2 copper part is stretched in a stretching die to form a T2 copper cladding sleeve with an open cavity structure; wherein the cavity shape is consistent with the outer contour shape of the Cu / 1008 steel stamping.

[0059] S3: Using CuP solder brazing, the steel layer of the Cu / 1008 steel stamping is inwardly embedded and welded into the cavity of the T2 copper cladding sleeve to obtain a copper-steel composite flat plate with a core of 1008 steel and an outer surface of Cu;

[0060] S4: bending the two ends of the copper-steel composite flat plate obtained in S3 to obtain a copper-steel composite support member.

[0061] S5: Ag / SnO 2 The electric contact is welded to the surface of the copper-steel composite support to obtain the required copper-steel composite electric contact assembly.

[0062] Comparative Example

[0063] The comparative example provides an electric contact assembly made of conventional copper-clad steel, wherein the conventional copper-clad steel, namely, a copper plate, a steel plate, and a copper plate are composited by rolling to obtain a Cu / Fe / Cu three-layer composite material.

[0064] The copper-steel composite electrical contact assembly sample prepared in the embodiment was compared with the electrical contact assembly prepared from conventional copper-clad steel in the comparative example to evaluate the corrosion resistance and yield rate. The detailed results are shown in Table 1 below.

[0065] Table 1 Corrosion resistance and yield performance test results

[0066] type Corrosion resistance test Yield Example Cu-Fe composite electrical contact assembly No pitting after 24 hours 89％ Comparative Example Electrical contact components made of conventional copper-clad steel 8h The punched section begins to pit 77％

[0067] It can be seen from Table 1 that a copper-steel composite electrical contact assembly for low-voltage electrical appliances that is rust-resistant, corrosion-resistant and has a higher yield rate is prepared by the method in the embodiment of the present invention.

[0068] The above embodiment of the present invention can effectively improve the corrosion and rust resistance of the product and extend the service life of electrical appliances such as circuit breakers by only using punching and welding. The processing method is simple, suitable for large-scale production, and has a high yield rate. In addition, compared with conventional copper-clad steel electrical contact assemblies, the method in the above embodiment of the present invention does not require electroplating, uses an integrated punching part, eliminates arc-starting accessories, shortens the production process of the electrical contact assembly, effectively reduces the production cost of the electrical contact assembly, and improves the production efficiency of the copper-steel composite material and its electrical contact assembly products.

[0069] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various modifications or variations within the scope of the claims, which does not affect the essence of the present invention. The above preferred features can be used in any combination without conflicting with each other.

Claims

1. A method for preparing a copper-steel composite support, characterized in that: include: Providing a copper-steel composite material strip with copper clad on one side, and punching the copper-steel composite material strip into a shape to obtain a planar copper-steel punching part; Providing a copper part, and performing a stretching process on the copper part according to the outer contour shape of the copper-steel stamping part to obtain a copper cladding sleeve; The copper-steel punching piece is inlaid and welded into the copper cladding sleeve to obtain a copper-steel composite flat piece with a steel core and a copper outer surface; The copper-steel composite flat plate is processed and formed to obtain a copper-steel composite support member.

2. The method for preparing the copper-steel composite support according to claim 1, characterized in that: The copper-steel composite material strip with single-sided copper cladding is provided, wherein: the copper-steel composite material strip comprises a copper layer and a steel layer, and the thickness ratio of the copper layer to the steel layer is (0.05:0.95) to (0.5:0.5).

3. The method for preparing the copper-steel composite support according to claim 2, characterized in that: The material of the copper layer is any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material and dispersion-enhanced copper-based material; the material of the steel layer is any one of iron, iron alloy, stainless steel, carbon steel, silicon steel, structural steel, alloy steel and copper-clad steel.

4. The method for preparing the copper-steel composite support according to claim 1, characterized in that: According to the outer contour shape of the copper-steel stamping part, the copper part is subjected to a stretching process, including: According to the outer contour shape of the copper-steel stamping part, the copper part is stretched in a stretching die to form a copper cladding sleeve with an open cavity, and the shape of the open cavity is consistent with the outer contour shape of the copper-steel stamping part.

5. The method for preparing the copper-steel composite support according to claim 1, characterized in that: The copper parts are provided, wherein the material of the copper parts is any one of pure copper, red copper, oxygen-free copper, copper alloy, composite copper material and dispersion-enhanced copper-based material.

6. The method for preparing the copper-steel composite support according to claim 1, characterized in that: The copper-steel stamping is inlaid and welded into the copper cladding sleeve, comprising: The steel layer of the copper-steel punching piece is placed inward, embedded and welded into the open cavity of the copper cladding sleeve, so as to obtain a copper-steel composite flat plate piece with a steel core and copper on the outer surface.

7. The method for preparing the copper-steel composite support according to claim 1, characterized in that: The copper-steel stamping is inlaid and welded into the copper cladding sleeve, wherein the welding is any one of soldering, diffusion welding, resistance welding, induction welding, laser welding and ultrasonic welding.

8. The method for preparing the copper-steel composite support according to claim 1, characterized in that: The copper-steel composite flat plate is processed and formed, including: bending the copper-steel composite flat plate with a bending die, or shaping the copper-steel composite flat plate with a shaping die to obtain a copper-steel composite support with a three-dimensional structure.

9. A copper-steel composite support, characterized in that: The copper-steel composite support is prepared by the preparation method of any one of claims 1 to 8.

10. An electrical contact assembly, characterized in that: It comprises an electric contact and the copper-steel composite support member as claimed in claim 9, wherein the electric contact is located on the surface of the copper-steel composite support member.

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