Preparation method of through type silver-copper composite material used as melt

Abstract

The invention provides a preparation method of a through-type silver-copper composite material used as a melt, and the preparation method comprises the following steps: carrying out multi-pass slotting treatment on the surface of a coiled copper strip along the length direction, and forming a plurality of grooves penetrating through the width direction of the copper strip on the surface of the copper strip; special-shaped machining is conducted on the two side faces of the groove; silver strips are positioned in the multiple grooves correspondingly, and continuous cold compounding is conducted through a special-shaped roller set; carrying out heat treatment on the material obtained by cold compounding; performing multi-pass cold rolling-annealing on the material subjected to heat treatment to obtain a composite material strip; and the composite material strip is brushed, so that the silver layer with the preset width is exposed from the bottom of the groove, and the through type silver-copper composite material used as the melt is formed. The composite interface bonding strength of the silver-copper composite material can be enhanced, and the production efficiency of the silver-copper composite material and the quality stability of the fuse melt are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and in particular to a method for preparing a through-type silver-copper composite material used as a melt. Background Art

[0002] A fuse is an electrical device that uses a metal conductor as a fuse to disconnect the circuit. When a short circuit occurs in the circuit, the fuse's fuse will quickly melt and cut off the circuit, thereby protecting household appliances, electrical equipment and power systems.

[0003] Pure silver is a key material for preparing fuse melt. However, with the rapid changes in the international situation, precious metal silver and other resources are becoming increasingly scarce, and the manufacturing cost of fuses has risen sharply. Therefore, it is particularly important to find a new type of melt to replace pure silver melt. The silver-copper composite material uses pure silver in the fuse function area and pure copper in other non-functional areas. Under the premise of not reducing the performance of the fuse melt, the precious metal silver is saved. Therefore, silver-copper composite materials, as a type of melt material to replace pure silver, are widely used in the field of fuses.

[0004] After searching the existing technologies of silver-copper composite materials for fuses at home and abroad, it was found that patent CN102814324A uses grooving in copper plates, placing silver plates in the grooves, cold rolling with large deformation, and then planing or grinding the copper surface of the composite blank to remove the pure copper layer, and then cold rolling, annealing, and secondary cold rolling to prepare silver-copper composite strips. However, this patent cannot constrain the non-rolling direction of the silver-copper composite material during the production process, resulting in the inability to fully extrude the silver-copper interface and unsatisfactory bonding strength; and under the pressure of the upper and lower rollers, the deformation of one surface protected by the copper layer is small, and the deformation of the other surface not protected by the copper layer is large, resulting in uneven deformation of the plate, and delamination and cracking at the composite. In addition, this preparation method uses a shorter copper plate for grooving, which cannot achieve large-scale continuous production of a single strip, and the length and weight of a single strip are limited. Due to the light weight of the roll, it is not suitable for automated production on the market side.

[0005] Patent CN102896150A fits the concave part of the silver strip with the convex part of the copper strip, and reinforces and welds the two ends to make a pre-composite material, and then obtains the finished product through hot rolling, diffusion annealing, rolling and cutting. This patent uses a combination of special-shaped copper and silver strips, and the side walls are not constrained by a frame. The position of the composite interface is subject to large differences in horizontal and lateral forces, which places high requirements on the size of the special-shaped material strips. If there are gaps in the splicing, the bonding strength of the finished product will be abnormal. Moreover, this preparation method is also unable to achieve large-scale continuous production of a single copper strip, and cannot meet the market's requirements for joint-free strips.

[0006] Patent CN108080414A is to put different numbers of copper bars and silver bars into a copper frame to form a composite ingot, then use a special-shaped roller group with positioning grooves to perform large deformation rolling, and then diffusion annealing treatment, and finally process it into a copper-silver composite strip through subsequent cold rolling, annealing, cleaning and other processes. However, due to the limitation of the copper frame, the length of a single strip in this patent cannot be too long, otherwise it will affect the loading and annealing of the composite ingot, and the production efficiency is low.

[0007] Therefore, there is an urgent need for a continuous composite preparation method for a high-strength interface silver-copper material strip that can be used for a fuse melt to replace the pure silver melt to solve at least one of the above problems. Summary of the invention

[0008] In view of the defects in the prior art, the object of the present invention is to provide a method for preparing a through-type silver-copper composite material used as a melt.

[0009] According to one aspect of the present invention, there is provided a method for preparing a through-type silver-copper composite material used as a melt, comprising:

[0010] Performing multiple groove processing on the surface of the rolled copper strip along the length direction to form a plurality of grooves on the surface of the copper strip that penetrate the width direction of the copper strip;

[0011] Performing special-shaped processing on the two side surfaces of the groove;

[0012] Positioning the silver bars in the plurality of grooves respectively and performing continuous cold cladding using a group of profiled rollers;

[0013] The material obtained by cold compounding is heat treated;

[0014] The heat-treated material is subjected to multiple cold rolling-annealing steps to obtain a composite material strip;

[0015] The composite material strip is cleaned and brushed so that a silver layer of a preset width is exposed from the bottom of the groove, thereby forming a through-type silver-copper composite material used as a melt.

[0016] Optionally, the multi-pass grooving process is performed on the surface of the rolled copper strip along the length direction, including: performing multiple die drawing on the surface of the rolled copper strip to continuously groove a plurality of grooves, wherein the cross-sectional shape of the grooves is rectangular or trapezoidal, the groove depth is not less than 80% of the total thickness of the copper strip, and the groove depth of each die drawing does not exceed 0.3 mm.

[0017] Optionally, the two side surfaces of the groove are subjected to special-shaped processing, including: using a canine-tooth-shaped scraper to continuously and multiple times perform canine-tooth-shaped special-shaped processing on the inner walls of both sides of the groove, and the depth of the canine teeth in each processing is not greater than 0.2 mm.

[0018] Optionally, the shape of the dog-tooth scraper die is any one or more of a triangle, a rectangle, a trapezoid and an arc, and the slotting speed is 0.5 m / min to 20 m / min.

[0019] Optionally, the silver bar is positioned in the plurality of grooves respectively, wherein: the width of the silver bar is 0.05 mm to 0.2 mm smaller than the width of the groove, and the height of the silver bar is 0.1 mm to 0.5 mm smaller than the depth of the groove.

[0020] Optionally, positioning the silver bars in the plurality of grooves respectively comprises:

[0021] A front positioning device is used to position and embed a plurality of silver bars in the grooves;

[0022] A pre-pressing roller is provided, wherein the upper roller of the pre-pressing roller is toothed, and the number of teeth of the upper roller is the same as the number of copper layers. The upper roller tooth of the pre-pressing roller is pressed to near the center of the copper layer, and the surface material of the copper layer is deformed and expanded to both sides, so that the silver-copper boundary part is wrapped therein.

[0023] Optionally, the continuous cold composite is performed using a special-shaped roller group, wherein: the upper roller and the lower roller of the special-shaped roller group are respectively provided with positioning grooves, the width of the positioning grooves matches the width of the copper strip, and the copper strip inlaid with silver bars is placed in the positioning grooves for cold composite rolling.

[0024] Optionally, the material obtained by cold cladding is subjected to heat treatment, wherein: a reducing gas is introduced during the heat treatment process, the heat treatment temperature is 300° C. to 750° C., and the traction speed of the strip is 0.1 m / min to 5 m / min.

[0025] Optionally, the heat-treated material is subjected to multiple cold rolling-annealing processes, wherein: the deformation amount of each cold rolling process is 10% to 30%; the annealing temperature is 300° C. to 800° C., the annealing time is 0.1 h to 10 h, and the annealing atmosphere is a protective atmosphere.

[0026] According to another aspect of the present invention, a through-type silver-copper composite material used as a melt is provided, which is prepared by using the above-mentioned method for preparing a through-type silver-copper composite material used as a melt.

[0027] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0028] The present invention adopts a rolled copper strip to continuously perform multiple-pass online die-drawing grooves, and performs special-shaped processing on the inner walls on both sides of the groove, so that the composite interface of silver and copper presents a tooth shape, and then after cold compounding and heat treatment diffusion and other treatments, the bonding strength of the silver-copper composite material at the composite interface is improved, which is beneficial to improving the anti-aging ability of the fuse melt and extending the service life of the product; when the silver strip and the copper strip are inlaid, there is no need for a copper frame to constrain the material, so that the length of the material processing is not limited by the length of the copper frame and the length of the heat treatment furnace, and the processable length of the silver-copper composite material produced each time can be increased, and the production efficiency of the silver-copper composite material for the fuse is significantly improved. In addition, the processing method of the present invention is simple, suitable for large-scale production, high yield rate, and stable product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 It is a schematic flow chart of a method for preparing a through-type silver-copper composite material used as a melt in one embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the local structure of the copper strip groove side after the canine-shaped special-shaped processing in one embodiment of the present invention;

[0032] Figure 3 It is a schematic cross-sectional view of the side of the groove of the copper strip after being processed into a canine-shaped special-shaped process in one embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of positioning silver bars in the grooves successively according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] 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.

[0035] Reference Figure 1 , a method for preparing a through-type silver-copper composite material used as a melt provided by an embodiment of the present invention comprises the following steps:

[0036] S1. Perform multiple groove processing on the surface of the rolled copper strip (copper strip coil) along the length direction to form multiple grooves on the surface of the copper strip that penetrate the width direction of the copper strip;

[0037] S2, performing special-shaped processing on the two sides of the groove;

[0038] S3, continuously positioning the silver bars in a plurality of grooves, and continuously cold-compositing them using a special-shaped roller group;

[0039] S4, heat treating the material obtained by cold compounding;

[0040] S5, performing multiple cold rolling-annealing on the heat-treated material to obtain a composite material strip;

[0041] S6. The composite material strip is cleaned on both sides for multiple times so that a silver layer of a preset width is exposed from the bottom of the groove. The preset width is the same as the width of the silver strip in step S3, forming a through-type silver-copper composite material used as a melt, in which the silver layer runs through the thickness direction of the copper material strip.

[0042] The embodiment of the present invention adopts a rolled copper strip to continuously groove in multiple passes online by drawing a die, and the inner walls on both sides of the groove are processed in a special shape, so that the composite interface of silver and copper presents a tooth shape. On the one hand, the tooth-shaped composite interface can increase the bonding area of ​​the two and improve the bonding force parallel to the plane direction of the material strip. On the other hand, the tooth-shaped bite mode of the composite interface increases the dislocation resistance perpendicular to the direction of the material strip, which is beneficial to improve the bonding strength of the composite interface. After cold compounding and heat treatment diffusion, the bonding strength of the silver-copper composite material at the composite interface is further improved, which is beneficial to improve the anti-aging ability of the fuse melt and extend the service life of the product; when the silver strip and the copper strip are inlaid, there is no need for a copper frame to constrain the material, so that the length of the material processing is not limited by the length of the copper frame and the length of the heat treatment furnace, which can increase the processable length of the silver-copper composite material produced each time, and significantly improve the production efficiency of the silver-copper composite material for the fuse. In addition, the processing method is simple, suitable for large-scale production, with a high yield rate and stable product performance.

[0043] The embodiment of the present invention uses a rolled copper strip, and the length of the copper substrate along the rolling direction is very long, and can be continuously processed on the production line. Compared with the prior art method of cutting the strip coil into sections and then compounding, the embodiment of the present invention increases the continuous processable length of the strip on the production line.

[0044] In some embodiments, in step S1, multiple grooves are continuously grooved on the surface of the rolled copper strip by multiple die drawing, wherein the cross-sectional shape of the groove is rectangular or trapezoidal, and the groove depth is not less than 80% of the total thickness of the copper strip, so that the silver bar can be easily placed in the groove, and the excess copper material at the bottom of the groove can be easily cleaned and removed in the subsequent process; multiple passes refer to the number of repeated groove opening processes, and the depth of each die drawing groove does not exceed 0.3mm, so that the excess copper material at the bottom of the groove can be quickly removed. Excess copper material refers to the excess copper material cut in the groove and taken out of the groove while the die drawing groove is being drawn. The number of die drawing grooves is determined according to the thickness of the silver bar, and the size and number of the grooves are determined according to factors such as the design requirements of different current levels of the fuse.

[0045] In a further embodiment, by increasing the depth of the grooves on the surface of the copper strip, the purpose of copper wrapping silver is achieved after compounding, which can prevent the silver layer area of ​​the material strip from being misaligned up and down, and can also effectively reduce the irregular deformation of the silver layer, thereby further improving the interface bonding strength.

[0046] Reference Figure 2 and Figure 3 In some embodiments, in step S2, multiple canine-shaped profile processing is performed on the two sides of the groove. Specifically, a canine-shaped scraping die is used to perform continuous, multiple passes of canine-shaped profile processing on the inner walls of both sides of the groove, and the depth of each pass of canine processing is not greater than 0.2 mm, thereby increasing the interface bonding area and the dislocation resistance perpendicular to the material strip direction, while facilitating the removal of excess copper in the canine teeth. The number and specific depth of the canine teeth are determined according to the required interface strength.

[0047] As an example, the shape of the dog-tooth scraper is any one or more of a triangle, a rectangle, a trapezoid and an arc. The above shapes are arranged in sequence along the side wall direction of the groove, thereby increasing the connection area between the silver bar and the copper strip groove at the side wall interface and increasing the bonding strength of the silver-copper composite interface. The grooving speed is 0.5m / min to 20m / min. In order to avoid softening, deformation and oxidation due to overheating during the grooving process of the material, a coolant is used during the grooving process. Exemplarily, the coolant is ethanol, acetone or other volatile organic solvents without residue.

[0048] In some embodiments, in step S3, the width of the silver bar is 0.05 mm to 0.2 mm smaller than the width of the groove, the height of the silver bar is 0.1 mm to 0.5 mm smaller than the depth of the groove, and the side wall of the silver bar is smooth and has no canine structure, thereby making it easier for the silver bar to fit tightly with the groove of the copper strip during subsequent cold compounding.

[0049] Specifically, step S3 includes the following processes: using a front positioning device to position and embed multiple silver bars in the grooves of the copper belt; providing a pre-pressing roller, the upper roller of the pre-pressing roller is a toothed roller, such as Figure 4As shown, the arrow indicates the teeth of the upper roller, and the number of teeth of the upper roller is the same as the number of copper layers, so as to wrap each silver bar, and the tooth depth of the upper roller is 0.1mm~0.5mm. The upper roller tooth profile of the pre-pressing roller is pressed to the vicinity of the center position of the copper layer (that is, the copper layer at the gap between the two silver bars, at the middle point along the width direction of the gap), so that after pre-pressing, the surface material of the copper layer is squeezed and deformed to both sides and expanded, so that the silver-copper boundary part is wrapped therein, and the semi-wrapped silver bar is realized; the upper roller and the lower roller of the special-shaped rolling roller group are respectively provided with positioning grooves, and the width of the positioning groove matches the width of the copper strip, so that the material strip does not expand laterally during rolling, and the composite interface is subjected to lateral force, which promotes the close combination of the silver-copper composite interface, and the copper strip inlaid with the silver strip is placed in the positioning groove for cold composite rolling. Preferably, the rolling deformation is 50%~90%, so that the material is fully squeezed and deformed at the silver-copper contact interface during rolling, and the fresh silver-copper composite interface forms a preliminary physical and mechanical bite.

[0050] The above-mentioned embodiment of the present invention adopts the mutual cooperation of special-shaped grooves, pre-positioned pre-rolling wrapping, special-shaped roller positioning groove inlaid cold compounding, etc. During the cold compounding process, the width of the roller positioning groove matches the width of the material strip, and the positioning groove of the roller constrains the material strip, so that the material strip does not expand laterally during rolling, and the composite interface is subjected to lateral force, which promotes the close combination of the silver-copper composite interface and greatly improves the quality stability of the fuse melt product. In addition, when the silver bar and the copper strip are inlaid, there is no need for the copper frame to constrain the material, so that the length of the material processing is not limited by the length of the copper frame and the length of the heat treatment furnace, and the processable length of the silver-copper composite material produced each time is increased, thereby significantly improving the production efficiency of the silver-copper composite material.

[0051] In some embodiments, in step S4, the process parameters are determined according to the interface bonding strength (or the formation conditions of the diffusion interface), the material is placed in a continuous annealing furnace, and a reducing gas is introduced during the heat treatment process. For example, the reducing gas is hydrogen or a nitrogen-hydrogen mixed gas, the heat treatment temperature is 300° C. to 750° C., and the strip pulling speed is 0.1 m / min to 5 m / min. In the reducing atmosphere, silver and copper form a good diffusion layer at the composite interface, so that the silver strip and the copper strip are firmly bonded.

[0052] In some embodiments, in step S5, the deformation amount of each cold rolling is 10% to 30%; the annealing temperature is 300° C. to 800° C., the annealing time is 0.1 h to 10 h, and the annealing atmosphere is a protective atmosphere.

[0053] Since part of the upper surface of the silver bar in the strip is coated with copper after the processing in step S3 is completed, in some embodiments, in step S6, the composite strip obtained in step S5 is cleaned by brushing to remove copper, so as to form a through-type silver-copper composite material. Specifically, a stainless steel brush is used to clean the upper and lower surfaces of the composite strip to remove excess copper wrapped on the bottom of the groove and the upper surface of the silver bar, so that the surface of the silver bar originally located at the bottom of the groove is exposed to the air, thereby forming a Ag-Cu-Ag-Cu through-type silver-copper composite material with a canine-tooth composite interface having a relatively high bonding strength, and the composite material can be used as a melt.

[0054] In the above embodiment of the present invention, the silver layer is pre-positioned in the special-shaped groove, and the copper layer is pre-pressed by a pre-pressing roller with a toothed structure on the upper roller, so that the composite strip forms a structure in which the copper material partially wraps the edge of the silver strip, and then the special-shaped roller positioning groove is embedded in cold composite and the bottom is brushed to remove copper to obtain a finished composite material. Compared with the existing preparation method, the composite interface of the prepared material is subjected to lateral force, which can promote the close bonding of the silver-copper composite interface. The material has higher bonding strength and greatly improves the quality stability of the fuse melt product. In addition, during the preparation process, there is no need for copper frame constraints, and the processing length of the material is not limited by the copper frame and the length of the heat treatment furnace, which significantly improves the production efficiency of the silver-copper composite material.

[0055] Another embodiment of the present invention provides a through-type silver-copper composite material used as a melt, which is prepared using the above-mentioned method for preparing a through-type silver-copper composite material used as a melt. The composite material has the characteristic of high silver-copper composite interface bonding strength. Using this material as a melt can improve the melt's anti-aging performance, thereby extending the melt's service life.

[0056] 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.

[0057] Example

[0058] The preparation method of the through-type silver-copper composite material used as a melt provided in this embodiment comprises the following steps:

[0059] S1: Three rectangular grooves are continuously grooved on the surface of the rolled T2 copper strip by two die drawing passes, wherein the groove depth is 85% of the total thickness of the copper strip, and the groove depth of each die drawing pass does not exceed 0.3 mm.

[0060] S2: Reference Figure 2 and Figure 3The inner walls of the two sides of the copper strip groove obtained by S1 are continuously and multi-passly processed into canine-shaped special-shaped shapes by using a canine-shaped scraper mold with canine-shaped sides. The depth of the canine teeth in each process is not more than 0.2 mm. The slotting speed is 5 m / min, and the coolant is ethanol.

[0061] S3: Continuously position the silver bars in the grooves on the surface of the copper strip, and use a special-shaped roller group for continuous cold compounding; first, use the front positioning device and pre-pressing roller to position and embed the three silver bars in the grooves of the copper strip, and use the upper roller tooth profile of the pre-pressing roller to press them near the center of the copper layer, so that after pre-pressing, the surface material of the copper layer deforms and expands to both sides, so that the silver-copper boundary part is wrapped in it. Then place the copper strip embedded with the silver bars in the positioning groove of the special-shaped roller group, and then use the special-shaped roller group with positioning grooves on both the upper and lower rollers for cold compound rolling, and the rolling deformation is 50%; among them, the upper roller of the pre-pressing roller is toothed, the number of teeth is the same as the number of copper layers, and the depth is 0.2mm; the width of the silver bar is 0.1mm smaller than the width of the copper strip groove; the height of the silver bar is 0.2mm less than the depth of the copper strip groove.

[0062] S4: The material obtained in S3 is placed in a continuous annealing furnace, and a reducing gas H2 is introduced for heat treatment, wherein the heat treatment temperature is 720° C. and the strip pulling speed is 3 m / min.

[0063] S5: The material after heat treatment in S4 is subjected to multiple cold rolling-annealing to be rolled to the required thickness, wherein the deformation amount of each cold rolling is 15%, the annealing temperature of each pass is 600°C, the annealing time is 3h, and the annealing atmosphere is H2 atmosphere.

[0064] S6: Use a stainless steel brush to clean the upper and lower surfaces of the composite material strip obtained in S5 to remove excess copper material at the bottom of the groove, so that the silver layer is exposed to a fixed width, forming an Ag-Cu-Ag-Cu type through-type silver-copper composite material with a canine-tooth composite interface with high bonding strength.

[0065] Comparative Example

[0066] The silver-copper composite material provided in the comparative example is prepared by the side lamination method in the prior art (CN102896150A).

[0067] The silver-copper composite material sample prepared in the embodiment was compared with the existing silver-copper composite material prepared by the side lamination method to conduct material composite interface peeling strength, anti-aging evaluation and overall yield evaluation. The detailed results are shown in Table 1.

[0068] Table 1 Results of material composite interface peel strength, anti-aging evaluation and overall yield rate evaluation

[0069]

[0070] It can be seen from Table 1 that a silver-copper composite material for fuses with high yield, high strength and aging resistance is prepared by the above-mentioned embodiment method of the present invention. The composite material is used as a melt to improve the aging resistance of the fuse melt, extend the service life of the product, and is beneficial to improving the performance stability of the fuse.

[0071] 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 through-type silver-copper composite material used as a melt, characterized in that: include: Performing multiple groove processing on the surface of the rolled copper strip along the length direction to form a plurality of grooves on the surface of the copper strip that penetrate the width direction of the copper strip; Performing special-shaped processing on the two side surfaces of the groove; Positioning the silver bars in the plurality of grooves respectively and performing continuous cold cladding using a group of profiled rollers; The material obtained by cold compounding is heat treated; The heat-treated material is subjected to multiple cold rolling-annealing steps to obtain a composite material strip; The composite material strip is cleaned and brushed so that a silver layer of a preset width is exposed from the bottom of the groove, thereby forming a through-type silver-copper composite material used as a melt.

2. The method for preparing a through-type silver-copper composite material used as a melt according to claim 1, characterized in that: The multi-pass grooving process is performed on the surface of the rolled copper strip along the length direction, including: multiple die drawing is performed on the surface of the rolled copper strip to continuously groove a plurality of grooves, wherein the cross-sectional shape of the groove is rectangular or trapezoidal, the groove depth is not less than 80% of the total thickness of the copper strip, and the groove depth of each die drawing does not exceed 0.3 mm.

3. The method for preparing a through-type silver-copper composite material used as a melt according to claim 1, characterized in that: The two side surfaces of the groove are subjected to special-shaped processing, including: using a canine-tooth-shaped scraper to continuously and multi-pass canine-tooth-shaped special-shaped processing on the inner walls of both sides of the groove, and the depth of the canine teeth in each processing pass is not greater than 0.2mm.

4. The method for preparing a through-type silver-copper composite material used as a melt according to claim 3, characterized in that: The dog-tooth scraper mold has a shape of any one or more of a triangle, a rectangle, a trapezoid and an arc, and a slotting speed of 0.5 m / min to 20 m / min.

5. The method for preparing a through-type silver-copper composite material used as a melt according to claim 1, characterized in that: The silver bars are positioned in the plurality of grooves respectively, wherein: the width of the silver bars is 0.05 mm to 0.2 mm smaller than the width of the grooves, and the height of the silver bars is 0.1 mm to 0.5 mm smaller than the depth of the grooves.

6. The method for preparing a through-type silver-copper composite material used as a melt according to claim 1, characterized in that: Positioning the silver bars in the plurality of grooves respectively comprises: A front positioning device is used to position and embed a plurality of silver bars in the grooves; A pre-pressing roller is provided, wherein the upper roller of the pre-pressing roller is toothed, and the number of teeth of the upper roller is the same as the number of copper layers. The upper roller tooth of the pre-pressing roller is pressed to near the center of the copper layer, and the surface material of the copper layer is deformed and expanded to both sides, so that the silver-copper boundary part is wrapped therein.

7. The method for preparing a through-type silver-copper composite material used as a melt according to claim 6, characterized in that: The continuous cold composite is performed by using a special-shaped roller group, wherein: the upper roller and the lower roller of the special-shaped roller group are respectively provided with positioning grooves, the width of the positioning grooves matches the width of the copper strip, and the copper strip inlaid with silver bars is placed in the positioning grooves for cold composite rolling.

8. The method for preparing a through-type silver-copper composite material used as a melt according to claim 1, characterized in that: The material obtained by cold cladding is subjected to heat treatment, wherein: reducing gas is introduced during the heat treatment process, the heat treatment temperature is 300° C. to 750° C., and the traction speed of the strip is 0.1 m / min to 5 m / min.

9. The method for preparing a through-type silver-copper composite material used as a melt according to claim 1, characterized in that: The heat-treated material is subjected to multiple cold rolling-annealing, wherein: the deformation amount of each cold rolling is 10% to 30%; the annealing temperature is 300° C. to 800° C., the annealing time is 0.1h to 10h, and the annealing atmosphere is a protective atmosphere.

10. A through-type silver-copper composite material used as a melt, characterized in that: The through-type silver-copper composite material used as a melt is prepared by the preparation method according to any one of claims 1 to 9.

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