A preparation method of a special-shaped contact strip of silver-based and copper-based double-layer composite material for riveting

Abstract

The application discloses a preparation method of a silver-based and copper-based double-layer composite riveting special-shaped contact strip, which comprises the following steps: (1) rolling of the silver-based and copper-based two-material composite front preparation; (2) surface treatment of the silver-based and copper-based two materials; (3) special-shaped side hot rolling of the silver-based and copper-based materials; (4) annealing of the composite strip; (5) strip rolling; (6) shearing and striping; (7) shaping rolling; and (8) ultrasonic cleaning. The application solves the problem that the common surface-to-surface composite process cannot meet the shape requirement of the special-shaped contact strip, and has the advantages of simple preparation method, high production efficiency, smooth silver-based and copper-based combination surface, simple structure of a subsequent forming die, long service life, good product consistency and stable production.

Description

Technical Field

[0001] This invention relates to electrical contact materials, specifically to a method for preparing a non-circular contact strip for riveting using a silver-based and copper-based double-layer composite material. Background Technology

[0002] The silver-based and copper-based double-layer composite riveting irregular contact strip is a contact strip material used in the production of internal riveting components for relays. It is produced by cutting the irregular contact strip to the required length using automated production equipment and then riveting it together with a spring to obtain the riveting assembly. A typical structure of the silver-based and copper-based double-layer composite riveting irregular contact strip is as follows: Figure 1 As shown: its cross-sectional shape is T-shaped, and the product width-to-thickness ratio is >1; the upper part of the T-shape is the contact part, which is composed of a top layer of silver-based material and a bottom layer of copper-based material; the lower part of the T-shape is the riveting part, which is formed by extending the bottom layer of copper-based material of the contact part.

[0003] In existing technologies, the manufacturing of irregularly shaped composite contact strips typically employs a concave-convex die composite method, where a silver-based material is placed above a copper-based material and subjected to hot rolling and deformation in the vertical direction within the concave-convex die cavity. This composite method struggles to achieve composite strips with a width-to-thickness ratio greater than 1, as 40%–80% composite rolling deformation is required to ensure composite strength. Consequently, the concave die depth is excessive, making the die difficult to manufacture, and particularly challenging to demold during composite processing, hindering stable mass production. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and provide a method for preparing irregular contact strips for riveting silver-based and copper-based double-layer composite materials. The method is characterized by double-sided roll forming and double-die forming. It utilizes commonly used irregular contact strip processing equipment and tooling to solve the problem that the surface composite process commonly used in the production of this type of irregular contact strip is difficult to achieve the product shape requirements. The preparation method is simple and does not require expensive roll forming and welding composite equipment, enabling stable, batch, and efficient production.

[0005] To achieve the above objectives, the present invention provides a method for preparing irregularly shaped contact strips for riveting silver-based and copper-based double-layer composite materials, which includes the following steps:

[0006] The manufacturing process of the method for preparing a special-shaped contact strip for riveting using a silver-based and copper-based double-layer composite material according to the present invention is as follows: Figure 2 The preparation steps and technical solutions adopted are described below:

[0007] a) Composite material preparation and rolling: Before composite preparation, the silver-based and copper-based materials are rolled using shaped concave and convex roll dies. The cross-sectional shape of the silver-based material is trapezoidal, with a height of H1×(1+15%~20%), a base dimension of W / (1-40%~80%)+W×(15%~20%), and an angle between the hypotenuse and the base of the trapezoid of (90-β)°. The cross-sectional shape of the copper-based material is square, with a side length of 2×H4×(1+15%~20%) in the horizontal direction (i.e., the height direction of the product) and a side length of W / (1-40%~80%)+W×(15%~20%) in the vertical direction (i.e., the width direction of the product). Two strips of silver-based material and one strip of copper-based material are prepared, and the three strips prepared are of equal length.

[0008] b) Material Surface Treatment and Annealing: The prepared silver-based and copper-based materials are first subjected to continuous ultrasonic cleaning in three tanks to remove surface oil. The first tank is for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length of each tank is 1–1.2 meters, the ultrasonic frequency is 20–40 kHz, and the power is 1.6–2 kW. The cleaning solution in the first and second tanks is industrial pure water with 5–8% industrial cleaning agent added, while the cleaning solution in the third tank is industrial pure water. The temperature of the cleaning solution in each tank is set at 50±5℃. The cleaning speed of the silver-based and copper-based strips is 8±1 m / min. The cleaned silver-based and copper-based materials are then annealed in a tubular continuous annealing furnace to remove internal processing stress. The effective annealing zone length of the annealing furnace is 10–12 m, the annealing speed is 3±0.5 m / min, and the annealing furnace tube is protected with argon or industrial ammonia decomposition gas, with a gas flow rate set at 0.6–1 m³ / min. 3 / h;

[0009] c) Irregular Side Composite: The trapezoidal lower edges of the two silver-based materials, after surface treatment and annealing, are respectively attached to the left and right sides of the square copper-based material (forming the product width direction); the three strips are introduced together into a high-frequency induction heating device and heated to 500-700°C, then introduced together into the inner cavity of a roll forming irregular composite die. After 40%-80% rolling deformation, the two silver-based materials and one copper-based material are composited together, resulting in a dumbbell-shaped composite strip with a copper-based middle section and silver-based sides, consisting of two semi-finished products connected together; during the composite operation, argon or industrial ammonia gas must be applied for protection inside the high-frequency induction heating tube and at the entrance and exit of the composite die, with a gas flow rate of 0.5-0.8 m³ / h in the high-frequency induction heating tube. 3 The gas flow rate at the inlet and outlet of the composite mold is 1.0–1.5 m³ / h. 3 / h; The width of the mold cavity is: 2×H×(1+15%~20%), and the minimum pressing thickness of the mold cavity is: product width dimension×(1+15%~20%);

[0010] d) Annealing: The composite strip is softened and annealed in a tubular continuous annealing furnace. The effective annealing zone length of the furnace is 10–12 m, the annealing speed is 3 ± 0.5 m / min, and the furnace tube is protected with argon or industrial ammonia decomposition gas. The gas flow rate is set to 0.6–1 m³ / min. 3 / h;

[0011] e) Slitting and rolling: The annealed composite strip is rolled using a special-shaped rolling die to obtain two semi-finished strips connected together, which are symmetrical and have a shape and size similar to the product. The width of the die cavity is 2×H×(1+15%~20%), and the minimum thickness of the die cavity is consistent with the width dimension of the product.

[0012] f) Slitting: The semi-finished strip is slitting into two equal strips using a rolling slitting die.

[0013] g) Double-die forming: The semi-finished strip is rolled and shaped using a double-die profiled roll forming die; the product contact portion is located in the inner cavity of the upper die, and the shape and size of the inner cavity of the upper die are consistent with those of the product contact portion; the product riveting portion is located in the inner cavity of the lower die, and the shape and size of the inner cavity of the lower die are consistent with those of the product riveting portion; after the semi-finished strip is rolled and shaped using the double-die profiled roll forming die, the finished contact strip is obtained;

[0014] h) Ultrasonic Cleaning: The irregularly shaped contact strip is subjected to continuous ultrasonic cleaning in three tanks to remove surface oil and foreign matter. The first tank is for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank is 1-1.2 meters, the ultrasonic frequency is 20-40 kHz, and the power is 1.6-2 kW. The cleaning solution in the first and second tanks is industrial pure water with 5-8% industrial cleaning agent added, while the cleaning solution in the third tank is industrial pure water. The temperature of the cleaning solution in each tank is set at 50±5℃. The cleaning speed of the strip is 8±1 m / min. After cleaning, the strip is packaged to obtain an irregularly shaped contact strip for riveting using a silver-based and copper-based double-layer composite material.

[0015] The intended effects of this invention are:

[0016] This invention solves the problem that it is difficult to achieve the product shape requirements by using the commonly used surface composite process for this type of irregular contact strip. The preparation method is simple, and two contact strips can be composited at the same time. The composite speed can reach 3m / min, which is more than 4 times that of roll welding composite equipment. The production efficiency is high, and the investment in roll welding composite equipment is expensive. This invention also solves the problem of subsequent molding difficulty. The mold structure is simple, easy to manufacture, has a long service life, and the product consistency is good. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0018] Figure 1 A schematic diagram of the irregular contact strip structure for riveting of the silver-based and copper-based double-layer composite material described in this invention. Figure 1 The meanings of the dimension symbols are as follows:

[0019] W - Total width of the product;

[0020] W1 - Width of the riveted portion of the product;

[0021] W2 - Width of the bottom edge of the silver-based material for the product;

[0022] H - Total height of the product;

[0023] H1 - Height of the silver-based material in the product;

[0024] H2 - Height of the product contact area;

[0025] H3 - Height of the riveted portion of the product;

[0026] H4 - Height of copper-based material in the product;

[0027] β-Product structural tilt angle;

[0028] R - Structural fillet radius for products;

[0029] Figure 2 This is a process flow diagram of a method for preparing a non-shaped contact strip for riveting a silver-based and copper-based double-layer composite material according to the present invention;

[0030] Figure 3 Example 1 of this invention: Product diagram;

[0031] Figure 4 Example 2 of this invention: Product diagram;

[0032] Figure 5 Example 3 of the present invention: Product diagram. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 3The image shows a double-layer composite riveting irregular contact strip. The product is composed of a silver-based material (AgNi0.15) and a copper-based material (Cu). The total width of the product (i.e., the widest part of the contact area) is W = 1 mm, and the width of the riveting part is W1 = 0.5 mm. The total height of the product is H = 1.65 mm, of which the height of the contact area is H2 = 0.85 mm, the height of the riveting part is H3 = 0.8 mm, the height of the AgNi0.15 layer is H1 = 0.45 mm, and the height of the Cu layer is H4 = 1.20 mm.

[0036] (i.e., H4 = H2 + H3 - H1); the structural tilt angle β of the contact portion is 15°. The product preparation method is as follows:

[0037] a) AgNi0.15 material is rolled into a strip with a trapezoidal cross-section using a special-shaped roll forming die. The trapezoidal dimensions are: height = 0.45 × (1 + 20%) = 0.54 (mm), base = 1 / (1 - 50%) + 1 × 20% = 2.2 (mm), and the angle between the side and base is 90° - 15° = 75°. Cu material is rolled into a strip with a rectangular cross-section using a special-shaped roll forming die. The rectangular dimensions are: length = 2 × 1.2 × (1 + 20%) = 2.88 (mm); width = 1 / (1 - 50%) + W × 20% = 2.2 (mm). Two strips of AgNi0.15 material and one strip of Cu material are prepared, and the three strips are of equal length.

[0038] b) Material Surface Treatment and Annealing: The prepared AgNi0.15 and Cu materials were first subjected to continuous ultrasonic cleaning in three tanks to remove surface oil. The first tank was for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank was 1.2 meters, the ultrasonic frequency was 40 kHz, and the power was 1.8 kW. The cleaning solution in the first and second tanks consisted of industrial pure water with 6% industrial cleaning agent added, while the cleaning solution in the third tank was industrial pure water. The temperature of the cleaning solution in each tank was set at 50 ± 5℃, and the cleaning speed was 8 ± 1 m / min. The cleaned materials were then annealed in a tubular continuous annealing furnace to remove internal processing stress. The effective annealing zone length of the annealing furnace was 10 m, the annealing speed was 3 ± 0.5 m / min, and the furnace tubes were protected with industrial ammonia decomposition gas with a gas flow rate set at 0.6 m³ / min. 3 / h; The annealing temperature of AgNi0.15 strip is 500±20℃, and the annealing temperature of Cu strip is 400±20℃;

[0039] c) Irregular Side Composite: The trapezoidal lower base edges of the two AgNi0.15 materials, after surface treatment and annealing, are respectively attached to the left and right sides of the square Cu material with a side length of 2.2mm. The three strips are introduced together into a high-frequency induction heating device and heated to 580±30℃. They are then introduced together into the inner cavity of a roll forming irregular composite die. After a 50% rolling deformation, the two AgNi0.15 materials and one Cu material are composited together, resulting in a dumbbell-shaped composite strip with Cu material in the middle and AgNi0.15 material on the left and right sides, connected to the two semi-finished products. During the composite operation, industrial ammonia gas protection must be applied inside the high-frequency induction heating tube and at the entrance and exit of the composite die. The gas flow rate inside the high-frequency induction heating tube is 0.5~0.8m³. 3 The gas flow rate at the inlet and outlet of the composite mold is 1.0–1.5 m³ / h. 3 / h; The width of the mold cavity is: 2×1.65×(1+20%)=3.96(mm), and the minimum pressing thickness of the mold cavity is: 1×(1+20%)=1.2(mm); The resulting composite strip has the following dimensions: 1.2×3.96×L(mm) 3 );

[0040] d) Annealing: The composite strip is softened and annealed in a tubular continuous annealing furnace. The effective annealing zone of the furnace is 10m long, and the annealing speed is 3±0.5m / min. Ammonia decomposition gas is used for protection inside the furnace tube, and the gas flow rate is set to 0.6~1m³ / min. 3 / h; Annealing temperature is 500±20℃;

[0041] e) Slitting and Rolling: The annealed composite strip is rolled using a special-shaped die to obtain two semi-finished strips connected together, which are symmetrical and have shapes and dimensions similar to the product. The die cavity width is 2 × 1.65 × (1 + 20%) = 3.96 (mm), and the minimum pressing thickness of the die cavity is 1 mm. The resulting semi-finished strip has external dimensions of 1 × 3.96 × L (mm). 3 );

[0042] f) Slitting: The semi-finished strip is slitted into two equal strips using a slitting die. The dimensions of the semi-finished strips are 1×1.98×L (mm). 3 );

[0043] g) Double-die forming: The semi-finished strip is rolled and formed using a double-die profiled roll forming die; the product contact portion is located in the inner cavity of the upper die, and the shape and size of the upper die inner cavity are consistent with those of the product contact portion; the product riveting portion is located in the inner cavity of the lower die, and the shape and size of the lower die inner cavity are consistent with those of the product riveting portion; after the semi-finished strip is rolled and formed by the double-die profiled roll forming die, a finished contact strip is obtained, with external dimensions of 1×1.65×L (mm). 3 );

[0044] h) Ultrasonic Cleaning: The irregularly shaped contact strip is subjected to continuous ultrasonic cleaning in three tanks to remove surface oil and foreign matter. The first tank is for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank is 1.2 meters, the ultrasonic frequency is 40 kHz, and the power is 1.8 kW. The cleaning solution in the first and second tanks is industrial pure water with 6% industrial cleaning agent added, while the cleaning solution in the third tank is industrial pure water. The temperature of the cleaning solution in each tank is set at 50 ± 5℃. The cleaning speed of the strip is 8 ± 1 m / min. After cleaning, the strip is packaged. Figure 3 The irregular contact strip shown is for riveting AgNi0.15 and Cu double-layer composite materials.

[0045] Example 2

[0046] like Figure 4 As shown, this is a double-layer composite riveting irregular contact strip. The product is composed of silver-based material AgNi10 and copper-based material CuNi20. The total width of the product (i.e., the widest part of the contact area) is shown.

[0047] W = 1.5mm, riveted section width W1 = 0.6mm; total product height H = 1.75mm, of which contact section height H2 = 0.85mm, riveted section height H3 = 0.9mm, AgNi10 layer height H1 = 0.6mm, CuNi20 layer height H4 = 1.15mm; contact section structural tilt angle β = 10°. The product manufacturing method is as follows:

[0048] a) The AgNi10 material is rolled into a strip with a trapezoidal cross-section using a shaped roll forming die. The trapezoidal dimensions are: trapezoidal height = 0.6 × (1 + 20%) = 0.72 (mm), and the base of the trapezoid...

[0049] =1.5 / (1-60%)+1.5×20%=4.05(mm), the angle between the side and the base of the trapezoid is 90°-10°=80°; the CuNi20 material is rolled into a rectangular strip using a special-shaped roll forming die. The dimensions of the rectangle are: length direction = 2×1.15×(1+20%)=2.76(mm); width direction

[0050] =1.5 / (1-60%)+1.5×20%=4.05(mm);; Two strips were prepared from AgNi10 material and one strip was prepared from CuNi20 material. The three strips prepared were of equal length.

[0051] b) Material Surface Treatment and Annealing: The prepared AgNi10 and CuNi20 materials were first subjected to continuous ultrasonic cleaning in three tanks to remove surface oil. The first tank was for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank was 1.2 meters, the ultrasonic frequency was 40 kHz, and the power was 1.8 kW. The cleaning solution in the first and second tanks consisted of industrial pure water with 6% industrial cleaning agent added, while the cleaning solution in the third tank was industrial pure water. The temperature of the cleaning solution in each tank was set at 50 ± 5℃, and the cleaning speed was 8 ± 1 m / min. The cleaned materials were then annealed in a tubular continuous annealing furnace to remove internal processing stress. The effective annealing zone length of the annealing furnace was 10 m, the annealing speed was 3 ± 0.5 m / min, and the furnace tubes were protected with industrial ammonia decomposition gas with a gas flow rate set at 0.6 m³ / min. 3 / h; The annealing temperature of AgNi10 strip is 600±20℃, and the annealing temperature of CuNi20 strip is 700±20℃;

[0052] c) Irregular Side Composite: The trapezoidal lower base edges of the two AgNi10 materials, after surface treatment and annealing, are respectively attached to the left and right sides of the square CuNi20 material with a side length of 4.05mm. The three strips are introduced together into a high-frequency induction heating device and heated to 650±30℃. They are then introduced together into the inner cavity of a roll forming irregular composite die. After 60% rolling deformation, the two AgNi10 materials and one CuNi20 material are composited together, resulting in a dumbbell-shaped composite strip with CuNi20 material in the middle and AgNi10 material on the left and right sides, connected to the two semi-finished products. During the composite operation, industrial ammonia gas protection must be applied inside the high-frequency induction heating tube and at the entrance and exit of the composite die. The gas flow rate inside the high-frequency induction heating tube is 0.5~0.8m³. 3 The gas flow rate at the inlet and outlet of the composite mold is 1.0–1.5 m³ / h. 3 / h; The width of the mold cavity is: 2×1.75×(1+20%)=4.2(mm), and the minimum pressing thickness of the mold cavity is: 1.5×(1+20%)=1.8(mm); The resulting composite strip has the following dimensions: 1.8×4.2×L(mm) 3 );

[0053] d) Annealing: The composite strip is softened and annealed in a tubular continuous annealing furnace. The effective annealing zone of the furnace is 10m long, and the annealing speed is 3±0.5m / min. Ammonia decomposition gas is used for protection inside the furnace tube, and the gas flow rate is set to 0.6~1m³ / min. 3 / h; Annealing temperature is 700±20℃;

[0054] e) Slitting and Rolling: The annealed composite strip is rolled using a special-shaped die to obtain two semi-finished strips connected together, which are symmetrical and have shapes and dimensions similar to the product. The die cavity width is 2 × 1.75 × (1 + 20%) = 4.2 (mm), and the minimum pressing thickness of the die cavity is 1.5 mm. The resulting semi-finished strip has external dimensions of 1.5 × 4.2 × L (mm). 3 );

[0055] f) Slitting: The semi-finished strip is slitted into two equal strips using a slitting die. The dimensions of the semi-finished strips are 1.5 × 2.1 × L (mm). 3 );

[0056] g) Double-die forming: The semi-finished strip is rolled and formed using a double-die profiled roll forming die; the product contact portion is located in the inner cavity of the upper die, and the shape and size of the upper die inner cavity are consistent with those of the product contact portion; the product riveting portion is located in the inner cavity of the lower die, and the shape and size of the lower die inner cavity are consistent with those of the product riveting portion; after the semi-finished strip is rolled and formed by the double-die profiled roll forming die, a finished contact strip is obtained, with external dimensions of 1.5 × 1.75 × L (mm). 3 )

[0057] h) Ultrasonic Cleaning: The irregularly shaped contact strip is subjected to continuous ultrasonic cleaning in three tanks to remove surface oil and foreign matter. The first tank is for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank is 1.2 meters, the ultrasonic frequency is 40 kHz, and the power is 1.8 kW. The cleaning solution in the first and second tanks is industrial pure water with 6% industrial cleaning agent added, while the cleaning solution in the third tank is industrial pure water. The temperature of the cleaning solution in each tank is set at 50 ± 5℃. The cleaning speed of the strip is 8 ± 1 m / min. After cleaning, the strip is packaged. Figure 4 The shown is a special-shaped contact strip for riveting AgNi10 and CuNi20 double-layer composite materials.

[0058] Example 3

[0059] like Figure 5The image shows a double-layer composite riveting irregular contact strip. The product is composed of silver-based AgSnO212 and copper-based CuSn6.5. The total width of the product (i.e., the widest part of the contact area) is W = 1.8 mm, and the width of the riveting part is W1 = 0.8 mm; the total height of the product is H = 1.9 mm, of which the height of the contact area is H2 = 1 mm, the height of the riveting part is H3 = 0.9 mm, the height of the AgSnO212 layer is H1 = 0.7 mm, and the height of the CuSn6.5 layer is H4 = 1.2 mm; the structural tilt angle of the contact area is β = 10°. The product manufacturing method is as follows:

[0060] a) The AgSnO212 material is rolled into a strip with a trapezoidal cross-section using a shaped roll forming die. The trapezoidal dimensions are: trapezoidal height = 0.7 × (1 + 20%) = 0.84 (mm), and the base of the trapezoid...

[0061] =1.8 / (1-50%)+1.8×20%=3.96(mm), the angle between the side and the base of the trapezoid is 90°-10°=80°; the CuSn6.5 material is rolled into a rectangular strip using a special-shaped roll forming die. The dimensions of the rectangle are: length direction = 2×1.2×(1+20%)=2.88(mm); width direction = 1.8 / (1-50%)+1.8×20%=3.96 (mm); two AgSnO212 materials and one CuSn6.5 material are prepared, and the three materials are of equal length;

[0062] b) Material Surface Treatment and Annealing: The prepared AgSnO212 and CuSn6.5 materials were first subjected to continuous ultrasonic cleaning in three tanks to remove surface oil. The first tank was for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank was 1.2 meters, the ultrasonic frequency was 40 kHz, and the power was 1.8 kW. The cleaning solution in the first and second tanks consisted of industrial pure water with 6% industrial cleaning agent added, while the cleaning solution in the third tank was industrial pure water. The temperature of the cleaning solution in each tank was set at 50 ± 5℃, and the cleaning speed was 8 ± 1 m / min. The cleaned materials were then annealed in a tubular continuous annealing furnace to remove internal processing stress. The effective annealing zone length of the annealing furnace was 10 m, the annealing speed was 3 ± 0.5 m / min, and the furnace tubes were protected with argon gas at a flow rate of 0.6 m³ / min. 3 / h; The annealing temperature of AgSnO212 strip is 700±20℃, and the annealing temperature of CuSn6.5 strip is 650±20℃;

[0063] c) Irregular Side Composite: The trapezoidal lower base edges of the two AgSnO212 materials, after surface treatment and annealing, are respectively attached to the left and right sides of the square CuSn6.5 material with a side length of 2.88mm. The three strips are introduced together into a high-frequency induction heating device and heated to 600±30℃. They are then introduced together into the inner cavity of a roll forming irregular composite die. After a 50% rolling deformation, the two AgSnO212 materials and one CuSn6.5 material are composited together, resulting in a dumbbell-shaped composite strip with CuSn6.5 material in the middle and AgSnO212 material on the left and right sides, connected to the two semi-finished products. During the composite operation, argon gas protection must be applied inside the high-frequency induction heating tube and at the entrance and exit of the composite die. The gas flow rate inside the high-frequency induction heating tube is 0.5~0.8m³. 3 The gas flow rate at the inlet and outlet of the composite mold is 1.0–1.5 m³ / h. 3 / h; The width of the mold cavity is: 2×1.9×(1+20%)=4.56(mm), and the minimum pressing thickness of the mold cavity is: 1.8×(1+20%).

[0064] = 2.16 (mm); the resulting composite strip dimensions are: 2.16 × 4.56 × L (mm) 3 );

[0065] d) Annealing: The composite strip is softened and annealed in a tubular continuous annealing furnace. The effective annealing zone of the furnace is 10m long, the annealing speed is 3±0.5m / min, and argon gas is used for protection inside the furnace tube. The gas flow rate is set to 0.6~1m³ / min. 3 / h; Annealing temperature is 650±20℃;

[0066] e) Slitting and Rolling: The annealed composite strip is rolled using a special-shaped die to obtain two semi-finished strips connected together, which are symmetrical and have shapes and dimensions similar to the product. The die cavity width is 2 × 1.90 × (1 + 20%) = 4.56 (mm), and the minimum pressing thickness of the die cavity is 1.8 mm. The resulting semi-finished strip has dimensions of 1.8 × 4.56 × L (mm). 3 );

[0067] f) Slitting: The semi-finished strip is slitted into two equal strips using a slitting die. The dimensions of the semi-finished strips are 1.8 × 2.28 × L (mm). 3 );

[0068] g) Double-die forming: The semi-finished strip is rolled and formed using a double-die profiled roll forming die; the product contact portion is located in the inner cavity of the upper die, and the shape and size of the upper die inner cavity are consistent with those of the product contact portion; the product riveting portion is located in the inner cavity of the lower die, and the shape and size of the lower die inner cavity are consistent with those of the product riveting portion; after the semi-finished strip is rolled and formed by the double-die profiled roll forming die, a finished contact strip is obtained, with external dimensions of 1.8 × 1.9 × L (mm). 3 );

[0069] h) Ultrasonic Cleaning: The irregularly shaped contact strip is subjected to continuous ultrasonic cleaning in three tanks to remove surface oil and foreign matter. The first tank is for rough ultrasonic cleaning, the second for fine ultrasonic cleaning, and the third for ultrasonic rinsing. The effective ultrasonic cleaning length in each tank is 1.2 meters, the ultrasonic frequency is 40 kHz, and the power is 1.8 kW. The cleaning solution in the first and second tanks is industrial pure water with 6% industrial cleaning agent added, while the cleaning solution in the third tank is industrial pure water. The temperature of the cleaning solution in each tank is set at 50 ± 5℃. The cleaning speed of the strip is 8 ± 1 m / min. After cleaning, the strip is packaged. Figure 5 The irregular contact strip shown is for riveting of AgSnO212 and CuSn6.5 double-layer composite materials.

[0070] While the invention has been described with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A method for preparing a non-circular contact strip for riveting using a silver-based and copper-based double-layer composite material, characterized in that... Includes the following steps: (1) Composite material preparation and rolling: The material preparation before composite is prepared by rolling with a special shaped concave and convex roll die. The material preparation includes two silver-based materials and one copper-based material. The cross-sectional shape of the silver-based material is trapezoidal and the cross-sectional shape of the copper-based material is square. The lengths of the three prepared strips are matched. (2) Material surface treatment: The silver-based material and the copper-based material that have been prepared are first cleaned by ultrasonic continuous cleaning to remove surface oil stains, and then annealed by tubular continuous annealing furnace to remove the internal processing stress of the material. (3) Irregular side composite: The bottom edges of the trapezoidal two silver-based materials after surface treatment and annealing are respectively attached to the left and right sides of the copper-based material in the width direction; the three strips are introduced into the high-frequency induction heating equipment and heated to 500~700℃, and then introduced into the inner cavity of the roll forming irregular composite mold. After 40%~80% rolling deformation, the two silver-based materials and one copper-based material are combined together to obtain a composite strip with copper-based material in the middle, silver-based material on the left and right sides, dumbbell shape, and two semi-finished products connected together; (4) Annealing of composite strip: The composite strip is softened and annealed in a tubular continuous annealing furnace; (5) Slitting and rolling: The annealed composite strip is rolled using a special-shaped rolling die to obtain a strip semi-finished product that is symmetrical on the left and right, and whose shape and size are similar to the product, with two semi-finished products connected together. (6) Cutting and slitting: The semi-finished strip is cut and slitting using a roller pressing slitting die, and is divided into two equal semi-finished strips; (7) Double-die forming and rolling: The semi-finished strip is formed by rolling through a double-die special-shaped rolling die; the contact part of the product is located in the inner cavity of the upper die, and the inner cavity of the upper die is consistent with the shape and size of the contact part of the product; the riveting part of the product is located in the inner cavity of the lower die, and the inner cavity of the lower die is consistent with the shape and size of the riveting part of the product; after the semi-finished strip is formed by rolling through the double-die special-shaped rolling die, a special-shaped contact strip for riveting of silver-based and copper-based double-layer composite materials is obtained; (8) Ultrasonic cleaning: The irregular contact strip is continuously cleaned by ultrasonic waves to remove oil and foreign matter from the surface of the strip, and then packaged to obtain the finished strip. The trapezoidal height of the silver-based material preparation dimensions is: H1×(1+15%~20%); the trapezoidal base dimension is: W / (1-40%~80%)+W×(15%~20%); the angle between the trapezoidal hypotenuse and the base is: (90-β)°, where H1 represents the height of the silver-based material, W represents the total width of the product, and β represents the structural tilt angle of the product; The horizontal side length of the square copper-based material is 2×H4×(1+15%~20%); the vertical side length is W / (1-40%~80%)+W×(15%~20%), where H4 represents the height of the copper-based material and W represents the total width of the product.

2. The method for preparing a non-circular contact strip for riveting a silver-based and copper-based double-layer composite material according to claim 1, characterized in that: Silver-based materials include: Ag, AgNi, AgCu, AgAu, AgC, AgWC, or AgMeO; copper-based materials include Cu, CuNi, CuSn, or CuZn.

3. The method for preparing a non-circular contact strip for riveting a silver-based and copper-based double-layer composite material according to claim 1, characterized in that: Steps (2) and (8) employ continuous ultrasonic cleaning in three tanks: the first tank is for rough ultrasonic cleaning, the second tank for fine ultrasonic cleaning, and the third tank for ultrasonic rinsing. The effective ultrasonic cleaning length of each tank is 1-1.2 meters, the ultrasonic frequency is 20-40 kHz, and the power is 1.6-2 kW. The cleaning solution in the first and second tanks is industrial pure water with 5-8% industrial cleaning agent added, while the cleaning solution in the third tank is industrial pure water. The temperature of the cleaning solution in each tank is set at 50±5℃. The cleaning speed of the silver-based and copper-based strips is 8±1 m / min.

4. The method for preparing a special-shaped contact strip for riveting a silver-based and copper-based double-layer composite material according to claim 1, characterized in that: The annealing in steps (2) and (4) is performed in a continuous tubular annealing furnace. The effective annealing zone length is 10-12 m, the annealing speed is 3 ± 0.5 m / min, and the furnace tube is protected with argon or ammonia decomposition gas. The gas flow rate is set to 0.6-1 m³ / min. 3 / h.

5. The method for preparing a non-circular contact strip for riveting a silver-based and copper-based double-layer composite material according to claim 1, characterized in that: In step (3), argon or industrial ammonia gas must be applied for protection inside the heating tube of the high-frequency induction equipment and at the inlet and outlet of the composite mold. The gas flow rate inside the high-frequency induction heating tube is 0.5~0.8 m³ / s. 3 The gas flow rate at the inlet and outlet of the composite mold is 1.0~1.5 m³ / h. 3 / h.

6. The method for preparing a non-circular contact strip for riveting a silver-based and copper-based double-layer composite material according to claim 1, characterized in that: The irregular side composite in step (3) adopts an irregular roller pressing concave-convex mold structure. The width of the mold cavity is: 2×H×(1+15%~20%). The minimum thickness of the mold cavity is: product width dimension×(1+15%~20%). H represents the total height of the product.

7. The method for preparing a non-circular contact strip for riveting a silver-based and copper-based double-layer composite material according to claim 1, characterized in that: The step (5) of slitting and rolling adopts a special-shaped roller pressing concave-convex mold structure. The width of the mold cavity is: 2×H×(1+15%~20%). The minimum thickness of the mold cavity pressing is: consistent with the product width direction dimension. H represents the total height of the product.

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