Composite material forming equipment and production method of copper-aluminum composite material

Abstract

The invention discloses composite material forming equipment and a production method of a copper-aluminum composite material. The composite material forming equipment comprises a frame body, a mold, an injection part and a pushing part. The production method comprises the following steps: S1, surface treatment; s2, preparing molten aluminum; s3, preheating the copper material; and S4, aluminum liquid injection. Compared with the prior art, the composite material forming equipment can achieve composite forming of copper and aluminum products in a die-casting mode, the injection part is pressed on the die, molten aluminum is extruded into the flow guide channel and then enters the die cavity through the flow guide channel, and the copper and aluminum solid-liquid compounding process is easy to control; the pushing piece pushes the molten aluminum to flow towards the flow guide channel, the flowing speed of the molten aluminum is increased, the compounding time is shorter, and the production efficiency is improved; compared with the performance of a product produced by a traditional friction welding process, the composite effect is better; according to the copper-aluminum composite material production method adopting the device, the resistivity of the copper-aluminum composite material part is greatly reduced, and the tensile strength is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of copper-aluminum composite materials, and in particular to a composite material forming device and a production method of a copper-aluminum composite material. Background Art

[0002] Copper-aluminum composite materials combine the characteristics of copper and aluminum. Copper has good corrosion resistance, can remain stable in a variety of environments, and is inexpensive; aluminum has good plasticity and machinability, and can be easily made into products of various shapes and sizes through extrusion, stretching, stamping and other processing methods.

[0003] The most widely used copper-aluminum composite material is the layered copper-aluminum composite material. The common preparation methods are: first, using copper-aluminum composite sheet as the substrate, machining, upsetting, and post-processing to form a composite product; second, using copper and aluminum materials as the substrate, using friction welding, molecular welding and other processes to form a composite product. The former has a higher cost and lower material utilization rate, and the copper-aluminum composite waste has a low value; the latter has low friction welding production efficiency and a high production defect rate. The copper-aluminum composite products produced by both processes are costly. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a composite material molding device and a copper-aluminum composite material production method, which can improve production efficiency and achieve the characteristics of high composite strength and low resistivity.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A composite material forming device comprises a frame, a mold, an injection mold and a pushing member, wherein the mold is connected to the frame, and the mold is provided with a liquid storage cavity and a mold cavity, wherein the liquid storage cavity is used to store aluminum liquid, and the mold cavity is used to place copper material; the injection mold is slidably connected to the frame, and the injection mold is provided with an extrusion portion and a pressing cavity, wherein along the sliding direction of the injection mold, the extrusion portion and the liquid storage cavity are arranged opposite to each other, and the pressing cavity and the mold cavity are arranged opposite to each other, and a guide channel is provided between the extrusion portion and the pressing cavity; when the injection mold is pressed on the mold, the pressing cavity and the mold cavity are fitted with each other, and the extrusion portion at least partially extends into the liquid storage cavity, so as to extrude the aluminum liquid into the pressing cavity; the pushing member is movably arranged in the liquid storage cavity, and when the injection mold is pressed on the mold, the pushing member is used to push the aluminum liquid toward the injection mold.

[0007] As one embodiment, the mold cavity is provided in plurality. When the shapes and sizes of the plurality of mold cavities are the same, the plurality of mold cavities are evenly spaced and arranged around the liquid storage cavity, and the distances between the plurality of mold cavities and the liquid storage cavity are the same.

[0008] Another object of the present invention is to provide a method for producing a copper-aluminum composite material, using the composite material molding equipment in any of the above embodiments, comprising the following steps: S1, surface treatment;

[0009] Select copper materials of required size and clean the surface of the copper materials;

[0010] S2, preparing aluminum liquid;

[0011] The aluminum material is melted to form aluminum liquid, and the aluminum liquid is deslagging and degassing, and the hydrogen content of the aluminum liquid is treated to a preset concentration, and the aluminum liquid is kept still for a preset time, and the temperature of the aluminum liquid is controlled within a preset temperature;

[0012] S3, preheating copper;

[0013] Preheating the copper material obtained in S1 to 200-421° C.; placing the preheated copper material in a mold cavity at a specified temperature;

[0014] S4, press-injection of aluminum liquid;

[0015] The aluminum liquid obtained in S2 is placed in the liquid storage cavity, and the injection mold is pressed toward the mold. The injection mold squeezes the aluminum liquid into the mold cavity. After the aluminum liquid is combined with the copper material to form a copper-aluminum composite material part, the mold is opened and the copper-aluminum composite material part is taken out.

[0016] As one embodiment, the surface cleaning in S1 includes the following steps:

[0017] First, the bonding surface of the copper material is roughened, and the oxide layer on the surface of the copper material is cleaned with an acidic detergent; then the treated copper material is placed in a cleaning machine, cleaned with a hydrocarbon cleaning solvent and air-dried, with the cleaning time being no less than 2 minutes and the air-drying time being no less than 5 minutes.

[0018] As one of the implementation modes, the preset concentration of hydrogen content in the aluminum liquid in S2 is lower than 0.15 ml / 100 g Al, and the static time is greater than 25 minutes.

[0019] As one embodiment, the preset temperature of the aluminum liquid in S2 is 680°C-800°C, or the preset temperature of the aluminum liquid is 50°C-150°C higher than its melting point.

[0020] As one implementation manner, the specified temperature of the mold in S3 is 200°C-300°C.

[0021] As one of the implementation modes, the boost pressure of the injection molding in S4 is 10-30 MPa, and the secondary quick pressing pressure is 15-35 MPa, so that the aluminum liquid and the copper material form a copper-aluminum alloy layer at the bonding surface.

[0022] As one implementation mode, the injection molded part is subjected to pressure holding after the secondary rapid pressing, and the composite material of the molten aluminum and the copper material is cooled, the pressure holding time is 5-30 seconds, and the cooling time is 5-30 seconds.

[0023] As one implementation manner, S3 and S4 are in an oxygen-free environment or a vacuum environment.

[0024] The beneficial effects of the present invention are as follows: the embodiment of the present application provides a composite material forming equipment and a production method of copper-aluminum composite materials, the composite material forming equipment includes a frame, a mold, a shot piece and a push piece, the mold is connected to the frame, the mold is provided with a liquid storage chamber and a mold cavity, the liquid storage chamber is used to store aluminum liquid, and the mold cavity is used to place copper material; the shot piece is slidably connected to the frame, the shot piece is provided with an extrusion part and a pressing cavity, along the sliding direction of the shot piece, the extrusion part and the liquid storage chamber are arranged oppositely, the pressing cavity and the mold cavity are arranged oppositely, and a guide channel is provided between the extrusion part and the pressing cavity; when the shot piece is pressed on the mold, the pressing cavity and the mold cavity are fitted with each other, and the extrusion part at least partially extends into the liquid storage chamber to extrude aluminum liquid into the pressing cavity; the push piece is movably arranged in the liquid storage chamber, and when the shot piece is pressed on the mold, the push piece is used to push the aluminum liquid toward the shot piece. The production method includes S1, surface treatment; S2, preparation of aluminum liquid; S3, preheating of copper material; S4, shot aluminum liquid. Compared with the prior art, the composite material forming equipment of the present application can realize the composite forming of copper-aluminum products by die casting, press the injection piece on the mold, squeeze the aluminum liquid into the guide channel, and then enter the mold cavity through the guide channel, so that the copper-aluminum solid-liquid composite process is easy to control, and the pusher pushes the aluminum liquid to flow into the guide channel, which speeds up the flow speed of the aluminum liquid, and the composite time is faster, which improves the production efficiency; the performance is compared with the products produced by the traditional friction welding process, and the composite effect is better; the copper-aluminum composite material production method of the device is adopted, and the internal resistance of the copper-aluminum composite part is reduced by 53.3%-89.2%.; The tensile strength is increased by 19%-57%; The resistivity of the copper-aluminum composite material part is greatly reduced, and the transmission efficiency and the stability and reliability of the electronic equipment are improved; and the copper-aluminum composite material with high tensile strength can ensure that the connection part can still conduct electricity normally during the long-term use of the battery, thereby extending the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a composite material molding device according to an embodiment of the present invention is shown;

[0026] Figure 2 A schematic structural diagram of a mold according to an embodiment of the present invention is shown;

[0027] Figure 3 A schematic top view of an injection molding according to an embodiment of the present invention is shown;

[0028] Figure 4A schematic structural diagram of an injection molding according to an embodiment of the present invention is shown;

[0029] Figure numerals: 1, frame; 2, mold; 21, liquid storage chamber; 22, mold cavity; 3, injection piece; 31, extrusion part; 32, pressing chamber; 33, guide channel. DETAILED DESCRIPTION

[0030] In the present invention, the terms "disposed", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "radial", "circumferential", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] See also Figure 1-Figure 4The embodiment of the present application provides a composite material molding device, including a frame 1, a mold 2, a shot piece 3 and a pusher (not shown in the figure), the mold 2 is connected to the frame 1, and the mold 2 is provided with a liquid storage chamber 21 and a mold cavity 22, the liquid storage chamber 21 is used to store aluminum liquid, and the mold cavity 22 is used to place copper material; the shot piece 3 is slidably connected to the frame 1, and the shot piece 3 is provided with an extrusion portion 31 and a pressing cavity 32, along the sliding direction of the shot piece 3, the extrusion portion 31 is arranged opposite to the liquid storage chamber 21, the pressing cavity 32 is arranged opposite to the mold cavity 22, and a guide channel 33 is provided between the extrusion portion 31 and the pressing cavity 32; when the shot piece 3 is pressed on the mold 2, the pressing cavity 32 and the mold cavity 22 are fitted with each other, and the extrusion portion 31 at least partially extends into the liquid storage chamber 21, so as to extrude the aluminum liquid into the pressing cavity 32; the pusher is movably arranged in the liquid storage chamber 21, and when the shot piece 3 is pressed on the mold 2, the pusher is used to push the aluminum liquid toward the shot piece 3.

[0036] In practical applications, the composite material forming equipment also includes a driving member, which is connected to the frame 1, and its driving end is connected to the injection member 3, and the driving member is used to push the injection member 3 to press against the mold 2. Along the sliding direction of the injection member 3, the injection member 3 and the mold 2 are arranged opposite to each other, and the extrusion portion 31 extends in the direction close to the mold 2, that is, the extrusion portion 31 is closer to the mold 2 than the pressing cavity 32. When the injection member 3 is fitted with the mold 2, it can be ensured that the extrusion portion 31 extends into the liquid storage cavity 21, and the pressing cavity 32 is fitted with the mold cavity 22. The extrusion portion 31 squeezes the aluminum liquid into the guide channel 33, and the aluminum liquid can flow into the pressing cavity 32 along the guide channel 33, and flow to the joint surface of the copper material in the mold cavity 22, so that the aluminum liquid is combined with the copper material to form a copper-aluminum composite material.

[0037] The device is also provided with a pusher, which is arranged in the liquid storage chamber 21. After the aluminum liquid is poured into the liquid storage chamber 21, when the injection part 3 is fitted with the mold 2, the pusher pushes the aluminum liquid to move in the direction close to the injection part 3, so that more aluminum liquid can be hydraulically guided to the flow guide channel 33, thereby guiding more aluminum liquid to the pressing chamber 32. Sufficient aluminum liquid can better fill every corner of the pressing chamber 32, reduce the possibility of defects such as shrinkage cavities and looseness, and improve production quality; and enough aluminum liquid can quickly fill the pressing chamber 32, reduce the filling time, and improve production efficiency. Among them, the driving member and the pusher can adopt structures such as hydraulic cylinders.

[0038] It should be noted that the bonding surface of the copper material refers to the side that needs to contact the aluminum liquid, that is, the side facing the pressing cavity 32. In practical applications, the bonding surface of the copper material can be set according to actual production needs, such as the bonding surface of the copper material can be set to single-sided, double-sided or multi-sided.

[0039] Compared with the prior art, the composite material forming equipment of the present application can realize the composite forming of copper and aluminum products by die casting. The injection piece 3 is pressed on the mold 2, and the aluminum liquid is squeezed into the guide channel 33, and then enters the mold cavity 22 through the guide channel 33, so that the copper-aluminum solid-liquid composite process is easy to control. The pushing piece pushes the aluminum liquid to flow into the guide channel 33, which speeds up the flow speed of the aluminum liquid, shortens the composite time, and improves production efficiency. Compared with the products produced by the traditional friction welding process, the composite effect is better.

[0040] In one embodiment, the mold cavity 22 is provided in plurality. When the shapes and sizes of the plurality of mold cavities 22 are the same, the plurality of mold cavities 22 are evenly spaced and arranged around the liquid storage cavity 21 , and the distances between the plurality of mold cavities 22 and the liquid storage cavity 21 are the same.

[0041] In practical applications, when standardized production is required, the copper parts can be divided into copper materials of uniform shape and size, and multiple mold cavities 22 can hold multiple copper materials at the same time. Correspondingly, the injection molded part 3 is also provided with a pressing cavity 32 corresponding to the number and position of the mold cavities 22, so that the time for the aluminum liquid to reach each mold cavity 22 is consistent, and multiple mold cavities 22 can perform casting or molding processes at the same time, realizing a one-mold-multiple-piece production method, thereby greatly improving the production speed.

[0042] In addition, multiple mold cavities 22 can make the temperature distribution in the mold 2 more uniform. During the production process, changes in the temperature of the mold 2 will affect the dimensional accuracy and mechanical properties of the product. By providing multiple mold cavities 22, heat can be dispersed, local overheating or overcooling can be reduced, thereby ensuring the consistency of product quality.

[0043] In one embodiment, multiple mold cavities 22 can also be set as cavities with different shapes and sizes to meet different production needs. Products with different sizes, shapes or performance requirements can be produced on the same set of molds 2, thereby improving the practicality of the mold 2.

[0044] It should be noted that when the shapes of multiple mold cavities 22 are different, the distance between the multiple mold cavities 22 and the liquid storage cavity 21 is set according to the actual molding time required. At the same time, the structure of the corresponding pressing cavity 32 also needs to be changed according to the shape of the mold cavity 22 to facilitate adaptation to the mold cavity 22.

[0045] Example 1

[0046] Another object of the present invention is to provide a method for producing a copper-aluminum composite material, using the above-mentioned composite material molding equipment, comprising the following steps:

[0047] S1. Surface treatment;

[0048] Select copper material of required size, firstly roughen the surface of the copper material, the roughening treatment can be done by grinding or etching with etching solution to improve the roughness of the copper surface, and use acid detergent to clean the oxide layer on the surface of the copper material; then put the treated copper material into the cleaning machine, clean it with hydrocarbon cleaning solvent and air dry it, the cleaning time is 2 minutes, and the air drying time is 5 minutes.

[0049] S2, preparing aluminum liquid;

[0050] Aluminum is melted to form aluminum liquid, and the aluminum liquid is deslagging and degassing. The hydrogen content of the aluminum liquid is treated to be less than 0.15ml / 100g Al, and it is kept still for 25 minutes. At the same time, the temperature of the aluminum liquid is controlled at 700℃ to ensure that the aluminum liquid can still be at the temperature required for copper-aluminum composite forming even if heat loss occurs during the whole process; among them, deslagging mainly removes impurities such as broken slag after aluminum liquid smelting, and degassing mainly removes hydrogen generated by the reaction of aluminum liquid with water vapor, and the increased hydrogen absorption of aluminum liquid caused by long-term smelting. Stillness can separate non-metallic oxides and alloy liquid, so as to achieve the purpose of purifying aluminum liquid.

[0051] S3, preheating copper;

[0052] In an oxygen-free environment or a vacuum environment, the copper material obtained in S1 is preheated to 200°C. Preheating can slow down the solidification rate of the aluminum liquid in contact with the copper material, promote the diffusion of atoms between copper and aluminum in a solid-liquid combination state, and facilitate the molding of copper-aluminum composite products. The preheated copper material is then placed in a mold cavity at 200°C. The temperature of the mold can ensure that the temperature of the copper material after preheating will not be lost too much, and at the same time facilitate smooth demolding after copper-aluminum combination molding.

[0053] S4, press-injection of aluminum liquid;

[0054] In an oxygen-free environment or a vacuum environment, the aluminum liquid obtained by S2 is placed in a liquid storage cavity, and the driving member is started. The driving member pushes the extrusion member close to the mold until the extrusion member and the mold are fitted together. At this time, the extrusion part extends into the liquid storage cavity, and the pressing cavity and the mold cavity are fitted together. Then, the extrusion member and the mold are locked together by a locking device so that the pressing cavity and the mold cavity form a closed environment, and at the same time; the pushing member is started, and the pushing member pushes the aluminum liquid toward the extrusion member so that the aluminum liquid flows from the guide channel to the pressing cavity and flows to the bonding surface of the copper material. In this embodiment, the boost pressure of the extrusion member is 15Mpa, the secondary fast pressing pressure is 20Mpa, the holding time is 15 seconds, and the cooling time is 15 seconds; after the aluminum liquid is combined with the copper material to form a copper-aluminum composite material part, the locking device is opened, the extrusion member is removed, and the copper-aluminum composite material part is taken out from the mold cavity.

[0055] Example 2

[0056] Another object of the present invention is to provide a method for producing a copper-aluminum composite material, using the above-mentioned composite material molding equipment, comprising the following steps:

[0057] S1. Surface treatment;

[0058] Select copper material of required size, firstly roughen the surface of the copper material, the roughening treatment can be done by grinding or etching with etching solution to improve the roughness of the copper surface, and use acid detergent to clean the oxide layer on the surface of the copper material; then put the treated copper material into the cleaning machine, clean it with hydrocarbon cleaning solvent and air dry it, the cleaning time is 3 minutes, and the air drying time is 5 minutes.

[0059] S2, preparing aluminum liquid;

[0060] Aluminum is melted to form aluminum liquid, and the aluminum liquid is deslagging and degassing. The hydrogen content of the aluminum liquid is treated to be less than 0.15ml / 100g Al, and it is kept still for 25 minutes. At the same time, the temperature of the aluminum liquid is controlled at 720℃ to ensure that the aluminum liquid can still be at the temperature required for copper-aluminum composite forming even if heat loss occurs during the whole process; among them, deslagging mainly removes impurities such as broken slag after aluminum liquid smelting, and degassing mainly removes hydrogen generated by the reaction of aluminum liquid and water vapor, and the increased hydrogen absorption of aluminum liquid caused by long-term smelting. Stillness can separate non-metallic oxides and alloy liquid, so as to achieve the purpose of purifying aluminum liquid.

[0061] S3, preheating copper;

[0062] In an oxygen-free environment or a vacuum environment, the copper material obtained in S1 is preheated to 280°C. Preheating can slow down the solidification rate of the aluminum liquid in contact with the copper material, promote the diffusion of atoms between copper and aluminum in the solid-liquid bonding state, and facilitate the molding of copper-aluminum composite products. The preheated copper material is then placed in a mold cavity at 300°C. The temperature of the mold can ensure that the temperature of the copper material after preheating will not be lost too much, and at the same time facilitate smooth demolding after the copper-aluminum bonding molding.

[0063] S4, press-injection of aluminum liquid;

[0064] In an oxygen-free environment or a vacuum environment, the aluminum liquid obtained by S2 is placed in a liquid storage cavity, and the driving member is started. The driving member pushes the extrusion member close to the mold until the extrusion member and the mold are fitted together. At this time, the extrusion part extends into the liquid storage cavity, and the pressing cavity and the mold cavity are fitted together. Then, the extrusion member and the mold are locked together by a locking device so that the pressing cavity and the mold cavity form a closed environment, and at the same time; the pushing member is started, and the pushing member pushes the aluminum liquid toward the extrusion member so that the aluminum liquid flows from the guide channel to the pressing cavity and flows to the bonding surface of the copper material. In this embodiment, the boost pressure of the extrusion member is 10Mpa, the secondary fast pressing pressure is 15Mpa, the holding time is 20 seconds, and the cooling time is 20 seconds; after the aluminum liquid and the copper material are combined to form a copper-aluminum composite material part, the locking device is opened, the extrusion member is removed, and the copper-aluminum composite material part is taken out from the mold cavity.

[0065] Example 3

[0066] Another object of the present invention is to provide a method for producing a copper-aluminum composite material, using the above-mentioned composite material molding equipment, comprising the following steps:

[0067] S1. Surface treatment;

[0068] Select copper material of required size, firstly roughen the surface of the copper material, the roughening treatment can be done by grinding or etching with etching solution to improve the roughness of the copper surface, and use acid detergent to clean the oxide layer on the surface of the copper material; then put the treated copper material into a cleaning machine, clean it with hydrocarbon cleaning solvent and air dry it, the cleaning time is 5 minutes, and the air drying time is 5 minutes.

[0069] S2, preparing aluminum liquid;

[0070] Aluminum is melted to form aluminum liquid, and the aluminum liquid is deslagging and degassing. The hydrogen content of the aluminum liquid is treated to be less than 0.15ml / 100g Al, and it is kept still for 25 minutes. At the same time, the temperature of the aluminum liquid is controlled at 680℃ to ensure that the aluminum liquid can still be at the temperature required for copper-aluminum composite forming even if heat loss occurs during the whole process; among them, deslagging mainly removes impurities such as broken slag after aluminum liquid smelting, and degassing mainly removes hydrogen generated by the reaction of aluminum liquid and water vapor, and the increased hydrogen absorption of aluminum liquid caused by long-term smelting. Stillness can separate non-metallic oxides and alloy liquid, so as to achieve the purpose of purifying aluminum liquid.

[0071] S3, preheating copper;

[0072] In an oxygen-free environment or a vacuum environment, the copper material obtained in S1 is preheated to 300°C. Preheating can slow down the solidification rate of the aluminum liquid in contact with the copper material, promote the diffusion of atoms between copper and aluminum in the solid-liquid bonding state, and facilitate the molding of copper-aluminum composite products. The preheated copper material is then placed in a mold cavity at 300°C. The temperature of the mold can ensure that the temperature of the copper material after preheating will not be lost too much, and at the same time facilitate smooth demolding after the copper-aluminum bonding molding.

[0073] S4, press-injection of aluminum liquid;

[0074] In an oxygen-free environment or a vacuum environment, the aluminum liquid obtained by S2 is placed in a liquid storage cavity, and the driving member is started. The driving member pushes the extrusion member close to the mold until the extrusion member and the mold are fitted together. At this time, the extrusion portion extends into the liquid storage cavity, and the pressing cavity and the mold cavity are fitted together. Then, the extrusion member and the mold are locked together by a locking device so that the pressing cavity and the mold cavity form a closed environment, and at the same time; the pushing member is started, and the pushing member pushes the aluminum liquid toward the extrusion member so that the aluminum liquid flows from the guide channel to the pressing cavity and flows to the bonding surface of the copper material. In this embodiment, the boost pressure of the extrusion member is 20Mpa, the secondary fast pressing pressure is 25Mpa, the holding time is 10 seconds, and the cooling time is 10 seconds; after the aluminum liquid and the copper material are combined to form a copper-aluminum composite material part, the locking device is opened, the extrusion member is removed, and the copper-aluminum composite material part is taken out from the mold cavity.

[0075] As shown in Table 1 below, in Example 1, the internal resistance of the sample was measured to be approximately 0.0056 mohm (milliohm), and the tensile strength of the sample was approximately 50 MPa (megapascals); in Example 2, the internal resistance of the sample was measured to be approximately 0.0026 mohm (milliohm), and the tensile strength of the sample was approximately 54 MPa (megapascals); in Example 2, the internal resistance of the sample was measured to be approximately 0.0013 mohm (milliohm), and the tensile strength of the sample was approximately 66 MPa (megapascals); and in the prior art (control group), the internal resistance of the sample was measured to be approximately 0.012 mohm (milliohm), and the tensile strength of the sample was approximately 42 MPa (megapascals).

[0076]

[0077] Table 1

[0078] Compared with the prior art, the copper-aluminum composite material produced by the production method of the present application has an internal resistance reduced by 53.3%-89.2%. The tensile strength is increased by 19%-57%. The resistivity of the copper-aluminum composite material is greatly reduced. The lower resistivity can reduce the loss of electric energy during transmission, reduce the energy loss caused by resistance heating, reduce the failure caused by heating, improve the power transmission efficiency and the stability and reliability of electronic equipment; and the copper-aluminum composite material with high tensile strength can ensure that the connection part can still conduct electricity normally during the long-term use of the battery, thereby extending the service life of the battery.

[0079] Different from the prior art, the embodiment of the present application provides a composite material forming equipment and a production method of copper-aluminum composite materials. The composite material forming equipment includes a frame, a mold, an injection mold and a pushing member. The mold is connected to the frame, and the mold is provided with a liquid storage chamber and a mold cavity. The liquid storage chamber is used to store aluminum liquid, and the mold cavity is used to place copper material; the injection mold is slidably connected to the frame, and the injection mold is provided with an extrusion part and a pressing cavity. Along the sliding direction of the injection mold, the extrusion part and the liquid storage chamber are arranged opposite to each other, and the pressing cavity and the mold cavity are arranged opposite to each other, and a guide channel is provided between the extrusion part and the pressing cavity; when the injection mold is pressed on the mold, the pressing cavity and the mold cavity are fitted with each other, and the extrusion part at least partially extends into the liquid storage chamber to extrude the aluminum liquid into the pressing chamber; the pushing member is movably arranged in the liquid storage chamber, and when the injection mold is pressed on the mold, the pushing member is used to push the aluminum liquid toward the injection mold. Compared with the prior art, the composite material forming equipment of the present application can realize the composite forming of copper-aluminum products by die casting, press the injection piece on the mold, squeeze the aluminum liquid into the guide channel, and then enter the mold cavity through the guide channel, so that the copper-aluminum solid-liquid composite process is easy to control, and the pusher pushes the aluminum liquid to flow into the guide channel, which speeds up the flow speed of the aluminum liquid, and the composite time is faster, which improves the production efficiency; the performance is compared with the products produced by the traditional friction welding process, and the composite effect is better; the copper-aluminum composite material production method of the device is adopted, and the internal resistance of the copper-aluminum composite part is reduced by 53.3%-89.2%.; The tensile strength is increased by 19%-57%; The resistivity of the copper-aluminum composite material part is greatly reduced, and the transmission efficiency and the stability and reliability of the electronic equipment are improved; and the copper-aluminum composite material with high tensile strength can ensure that the connection part can still conduct electricity normally during the long-term use of the battery, thereby extending the service life of the battery.

[0080] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for producing a copper-aluminum composite material, characterized in that: The production method comprises the following steps: S1. Surface treatment; Select copper materials of required size and clean the surface of the copper materials; S2, preparing aluminum liquid; The aluminum material is melted to form aluminum liquid, and the aluminum liquid is deslagging and degassing, and the hydrogen content of the aluminum liquid is treated to a preset concentration, and the aluminum liquid is kept still for a preset time, and the temperature of the aluminum liquid is controlled within a preset temperature; S3, preheating copper; Preheating the copper material obtained in S1 to 200-421° C.; placing the preheated copper material in a mold cavity of a composite material molding device, wherein the temperature of the mold is pre-adjusted to a specified temperature; S4, press-injection of aluminum liquid; The aluminum liquid obtained in S2 is placed in the liquid storage chamber of the composite material forming equipment, and the injection mold is pressed toward the mold. The injection mold squeezes the aluminum liquid into the mold cavity. After the aluminum liquid combines with the copper material to form a copper-aluminum composite material part, the mold is opened and the copper-aluminum composite material part is taken out.

2. The method for producing the copper-aluminum composite material according to claim 1, characterized in that: The surface cleaning in S1 comprises the following steps: First, the bonding surface of the copper material is roughened, and the oxide layer on the surface of the copper material is cleaned with an acidic detergent; then the treated copper material is placed in a cleaning machine, cleaned with a hydrocarbon cleaning solvent and air-dried, with the cleaning time being no less than 2 minutes and the air-drying time being no less than 5 minutes.

3. The method for producing the copper-aluminum composite material according to claim 1, characterized in that: The preset concentration of hydrogen content in the aluminum liquid in S2 is lower than 0.15 ml / 100 g Al, and the static time is greater than 25 minutes.

4. The method for producing the copper-aluminum composite material according to claim 1, characterized in that: The preset temperature of the aluminum liquid in S2 is 680°C-800°C, or the preset temperature of the aluminum liquid is 21°C-121°C higher than its melting point.

5. The method for producing the copper-aluminum composite material according to claim 1, characterized in that: The specified temperature of the mold in S3 is 200°C-300°C.

6. The method for producing the copper-aluminum composite material according to claim 1, characterized in that: The boost pressure of the injection molding in S4 is 10-30 MPa, and the secondary quick pressing pressure is 15-35 MPa, so that the aluminum liquid and the copper material form a copper-aluminum alloy layer at the bonding surface.

7. The method for producing the copper-aluminum composite material according to claim 6, characterized in that: The injection molded part is subjected to pressure holding after the secondary rapid pressing, and the aluminum liquid and copper material composite material is cooled, the pressure holding time is 5-30 seconds, and the cooling time is 5-30 seconds.

8. The method for producing the copper-aluminum composite material according to claim 1, characterized in that: The S3 and S4 are in an oxygen-free environment or a vacuum environment.

9. A composite material molding device, characterized in that: The method for producing the copper-aluminum composite material according to any one of claims 1 to 8 comprises: Frame (1); A mold (2) is connected to the frame (1), and the mold (2) is provided with a liquid storage cavity (21) and a mold cavity (22), wherein the liquid storage cavity (21) is used to store aluminum liquid, and the mold cavity (22) is used to place copper material; An injection piece (3) is slidably connected to the frame (1), and the injection piece (3) is provided with an extrusion portion (31) and a pressing cavity (32). Along the sliding direction of the injection piece (3), the extrusion portion (31) is arranged opposite to the liquid storage cavity (21), and the pressing cavity (32) is arranged opposite to the mold cavity (22). A guide channel (33) is provided between the extrusion portion (31) and the pressing cavity (32); when the injection piece (3) is pressed against the mold (2), the pressing cavity (32) and the mold cavity (22) are fitted with each other, and the extrusion portion (31) at least partially extends into the liquid storage cavity (21) to extrude aluminum liquid into the pressing cavity (32); A pushing member is movably arranged in the liquid storage cavity (21), and when the injection member (3) is pressed against the mold (2), the pushing member is used to push the aluminum liquid toward the injection member (3).

10. The composite material molding equipment according to claim 1, characterized in that: The mold cavities (22) are arranged in a plurality, and when the shapes and sizes of the plurality of mold cavities (22) are the same, the plurality of mold cavities (22) are arranged at even intervals around the liquid storage cavity (21), and the distances between the plurality of mold cavities (22) and the liquid storage cavity (21) are the same.

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