Method for processing and manufacturing titanium-copper mother board of titanium-copper composite material

Abstract

The invention discloses a titanium-copper composite material titanium-copper starting sheet processing and manufacturing method, which relates to the technical field of metal composite material processing, and comprises four key steps of composite material preparation, machining forming, welding treatment and flattening treatment. The titanium-copper composite material is prepared through the explosive welding or rolling composite technology, the metallurgical bonding strength between copper and titanium is ensured, meanwhile, interface gaps are eliminated, the conductivity and corrosion resistance are remarkably improved, and seamless connection between the titanium-copper composite material and a titanium plate is achieved through the welding technology. The machining method is stable in process, high in efficiency, capable of remarkably reducing the production cost and suitable for large-scale industrial production of the titanium-copper composite material mother board.

Description

Technical Field

[0001] The present invention relates to the technical field of metal composite material processing, and more specifically to a processing and manufacturing method for titanium-copper composite titanium-copper starter plates. Background Art

[0002] Titanium-copper starter plates are mainly used in the production of electrolytic copper and electrolytic nickel, and are an important cathode material for electrolytic cells. Titanium-copper starter plates usually consist of a titanium plate and a titanium-copper composite rod or a titanium-copper composite lug. The function of the titanium-copper composite rod or lug is to connect the titanium plate to the conductive system of the electrolytic cell to ensure the smooth conduction of current.

[0003] Currently, the method of pressing is generally used to produce titanium-copper starter plates. The specific process is as follows: using a titanium tube and a copper rod to make a titanium-copper composite conductive rod, stretching the conductive rod, sawing the conductive rod, welding both ends of the conductive rod, welding the conductive rod to the titanium plate, and flattening the titanium plate. The entire shaping production cycle of the above titanium-copper starter plate is long and the manufacturing technology is complex. The conductive rod is formed by stretching and pressing a titanium tube and a copper rod together. During use, the conductive rod will work in an acidic environment and at a temperature of conductive heating. After using for a period of time, due to different thermal expansions of titanium and copper, delamination occurs on the titanium-copper bonding surface, resulting in poor contact and a decrease in conductivity; in addition, due to the delamination of titanium and copper, copper salt crystals are likely to appear on the titanium-copper delamination surface in an acidic environment, leading to accelerated delamination of the titanium-copper bonding surface, thereby affecting the conductivity and service life. Summary of the Invention

[0004] The purpose of the present invention is: to solve the above technical problems, the present invention provides a processing and manufacturing method for a titanium-copper composite titanium-copper starter plate, in which there is no gap between copper and titanium in the titanium-copper composite material, avoiding the problem of gap generation.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] A processing and manufacturing method for a titanium-copper composite titanium-copper starter plate, comprising the following steps:

[0007] a. Composite material preparation: Using an explosive welding process to composite a titanium plate and a copper plate into the raw material of a titanium-copper conductive rod;

[0008] b. Machining and forming: Machining and cutting the composite material to make a conductive rod;

[0009] c. Welding treatment: Welding the titanium end of the conductive rod to the titanium plate;

[0010] d. Flattening treatment: Flattening the welded starter plate to ensure flatness.

[0011] Further, in step a, the thicknesses of both the titanium plate and the copper plate are 2-3 mm, and the bonding strength between the titanium plate and the copper plate in the composite material in step a is greater than 30 MPa.

[0012] Further, in step b, the diameter of the conductive rod is 20 - 30 mm, the cutting speed in step b is controlled at 100 - 150 m / min, the feed rate is 0.1 - 0.2 mm / r, and the surface roughness Ra value of the conductive rod is less than 0.8 μm.

[0013] Further, in step c, the thickness of the titanium plate is 4 - 5 mm, the welding power in step c is 10 - 12 kW, the welding speed is 8 - 10 mm / s, the welding current is 200 - 220 A, and the welding voltage is 50 - 55 V.

[0014] Further, in step d, the control flattening force for the flattening process is 100 - 110 kN, the flattening speed is 5 - 7 mm / min, ensuring that the flatness of the seed plate reaches ±0.1 mm.

[0015] The beneficial effects of the present invention are as follows: The titanium - copper composite plate tightly combines the copper plate and the titanium plate through the explosion welding process, forming an integrally structure with mutual fusion welding. A seamless combination is achieved between copper and titanium, completely eliminating the contact resistance and corrosion risks caused by gaps, thereby significantly improving the electrical conductivity and service life of the copper - titanium conductive rod. This process is simple to operate, significantly simplifies the production process, greatly shortens the processing time, effectively improves the overall production efficiency, and at the same time ensures the stability and durability of the material under high - load working conditions. Specific Embodiments

[0016] The following will detail the present invention in combination with specific embodiments. Here, the schematic embodiments of the present invention and the explanations are used to explain the present invention, but do not limit the present invention.

[0017] Example 1

[0018] The present invention provides the following technical solutions:

[0019] A method for processing and manufacturing a titanium - copper composite material titanium - copper seed plate, comprising the following steps:

[0020] a. Composite material preparation: The thickness of the titanium plate is 2 mm, the thickness of the copper plate is 2 mm, and they are compounded into the raw material of the copper - titanium conductive rod through the explosion welding process. Before explosion welding, the surfaces of the titanium plate and the copper plate are cleaned to remove impurities such as oil stains and oxides, ensuring the purity of the composite interface. During explosion welding, the detonation velocity of the explosive is controlled at 2500 m / s, and the welding pressure is 120 MPa, ensuring uniform bonding strength between the titanium plate and the copper plate. After compounding, the bonding strength between the titanium plate and the copper plate reaches more than 30 MPa, there are no obvious defects at the bonding interface, and ultrasonic testing confirms that there are no defects such as cracks and delaminations at the bonding interface;

[0021] b. Machining and forming: The composite material is machined using a high-precision CNC machine tool to produce a conductive rod with a diameter of 20 mm. During the machining process, the cutting speed is controlled at 100 m / min, the feed rate is 0.1 mm / r, and the spindle speed is 800 r / min to ensure that the surface roughness Ra value of the conductive rod is less than 0.8 μm, and there are no obvious deformations or cracks in the machined conductive rod. After machining and forming, the composite material is cooled using a coolant to prevent the material properties from deteriorating due to the heat generated during the machining process. The coolant is a water-based cutting fluid with a flow rate of 10 L / min and a pressure of 0.5 MPa to ensure the stability and surface quality of the machining process;

[0022] c. Welding treatment: The titanium end of the conductive rod is welded to a titanium plate with a thickness of 4 mm using an electron beam welding process. The welding parameters are: power 10 kW, welding speed 8 mm / s, welding current 200 A, and welding voltage 50 V. During the welding treatment process, the welding environment is protected by an inert gas with a gas flow rate of 10 L / min and a pressure of 0.1 MPa to prevent material oxidation during welding. After welding, the joint is heat-treated to eliminate welding stress. The heat treatment temperature is 600 °C, and the holding time is 30 minutes, followed by air cooling to room temperature. Finally, ultrasonic testing is used to confirm that there are no defects such as cracks, pores, and lack of fusion in the welded joint, and metallographic analysis is performed on the joint to ensure that the microstructure in the welding area is uniform;

[0023] d. Flattening treatment: The welded seed plate is flattened using a hydraulic flattening device, controlling the flattening force at 100 kN, the flattening speed at 5 mm / min, and the flattening stroke at 100 mm. During the flattening treatment process, the flattening device is equipped with a multi-point support structure to ensure that the seed plate is evenly stressed during flattening and avoid local deformation. The device is equipped with a pressure sensor and a displacement sensor to monitor the flattening force and the deformation of the seed plate in real time to ensure that the flatness of the seed plate reaches ±0.1 mm, and a laser flatness measuring instrument is used for the final detection. After flattening, the surface of the seed plate is subjected to anti-oxidation treatment by spraying an anti-rust coating with a coating thickness of 5 μm to ensure the corrosion resistance of the seed plate.

[0024] Example 2

[0025] The present invention provides the following technical solutions:

[0026] A method for machining and manufacturing a titanium-copper composite material titanium-copper seed plate, comprising the following steps:

[0027] a. Preparation of composite material: The thickness of the titanium plate is 2.5 mm, and the thickness of the copper plate is 3 mm. They are compounded into the raw material of the titanium-copper conductive rod through the explosion welding process. Before explosion welding, the surfaces of the titanium plate and the copper plate are cleaned to remove impurities such as oil stains and oxides to ensure the purity of the composite interface. During explosion welding, the detonation velocity of the explosive is controlled at 2500 m / s, and the welding pressure is 120 MPa to ensure uniform bonding strength between the titanium plate and the copper plate. After compounding, the bonding strength between the titanium plate and the copper plate reaches more than 30 MPa, there are no obvious defects at the bonding interface, and ultrasonic testing confirms that there are no defects such as cracks and delaminations at the bonding interface;

[0028] b. Machining and forming: Use a high-precision CNC machine tool to machine the composite material into a conductive rod with a diameter of 20 mm. During the machining process, the cutting speed is controlled at 125 m / min, the feed rate is 0.15 mm / r, and the spindle speed is 800 r / min to ensure that the surface roughness Ra value of the conductive rod is less than 0.8 μm, and there are no obvious deformations or cracks in the machined conductive rod. After machining and forming, use a coolant to cool the composite material to prevent the heat generated during the machining process from causing a decrease in material properties. The coolant is a water-based cutting fluid with a flow rate of 10 L / min and a pressure of 0.5 MPa to ensure the stability and surface quality of the machining process;

[0029] c. Welding treatment: Adopt the electron beam welding process to weld the titanium end of the conductive rod to a titanium plate with a thickness of 4.5 mm. The welding parameters are: power 11 kW, welding speed 9 mm / s, welding current 210 A, and welding voltage 52 V. During the welding treatment process, the welding environment is protected by inert gas, and the gas flow rate is 10 L / min and the pressure is 0.1 MPa to prevent material oxidation during welding. After welding, the joint is heat-treated to eliminate welding stress. The heat treatment temperature is 600 °C, and the holding time is 40 minutes, and then air-cooled to room temperature. Finally, ultrasonic testing is used to confirm that there are no defects such as cracks, pores, and lack of fusion in the welded joint, and metallographic analysis is carried out on the joint to ensure uniform microstructure in the welding area;

[0030] d. Flattening treatment: Use a hydraulic flattening device to flatten the welded plate, control the flattening force at 105 kN, the flattening speed at 6 mm / min, and the flattening stroke at 100 mm. During the flattening treatment process, the flattening device is equipped with a multi-point support structure to ensure uniform force on the plate during flattening and avoid local deformation. The device is equipped with a pressure sensor and a displacement sensor to monitor the flattening force and the deformation of the plate in real time to ensure that the flatness of the plate reaches ±0.1 mm, and the final detection is carried out by a laser flatness measuring instrument. After flattening, the surface of the plate is subjected to anti-oxidation treatment and a rust-proof coating is sprayed, and the coating thickness is 5 μm to ensure the corrosion resistance of the plate.

[0031] Example 3

[0032] The present invention provides the following technical solutions:

[0033] A method for processing and manufacturing a titanium-copper composite titanium-copper starter sheet, comprising the following steps:

[0034] a. Composite material preparation: The thickness of the titanium plate is 3 mm, and the thickness of the copper plate is 2 mm. The raw material of the titanium-copper conductive bar is formed by explosive welding. Before explosive welding, the surfaces of the titanium plate and the copper plate are cleaned to remove impurities such as oil stains and oxides to ensure the purity of the composite interface. During explosive welding, the detonation velocity of the explosive is controlled at 2500 m / s, and the welding pressure is 120 MPa to ensure uniform bonding strength between the titanium plate and the copper plate. After composite, the bonding strength between the titanium plate and the copper plate reaches more than 30 MPa, the bonding interface has no obvious defects, and it is confirmed by ultrasonic testing that there are no defects such as cracks and delamination at the bonding interface;

[0035] b. Machining and forming: The composite material is machined using a high-precision numerical control machine tool to form a conductive bar with a diameter of 30 mm. During the machining process, the cutting speed is controlled at 150 m / min, the feed rate is 0.2 mm / r, and the spindle speed is 800 r / min to ensure that the surface roughness Ra value of the conductive bar is less than 0.8 μm, and there are no obvious deformations or cracks in the machined conductive bar. After machining and forming, the composite material is cooled using a coolant to prevent the heat generated during the machining process from causing a decline in material properties. The coolant is a water-based cutting fluid with a flow rate of 10 L / min and a pressure of 0.5 MPa to ensure the stability and surface quality of the machining process;

[0036] c. Welding treatment: The titanium end of the conductive bar is welded to a titanium plate with a thickness of 5 mm using an electron beam welding process. The welding parameters are: power 12 kW, welding speed 10 mm / s, welding current 220 A, and welding voltage 55 V. During the welding treatment process, the welding environment is protected by an inert gas with a gas flow rate of 10 L / min and a pressure of 0.1 MPa to prevent material oxidation during welding. After welding, the joint is heat-treated to eliminate welding stress. The heat treatment temperature is 600 °C, and the holding time is 50 minutes, followed by air cooling to room temperature. Finally, it is confirmed by ultrasonic testing that there are no defects such as cracks, pores, and lack of fusion at the welded joint, and a metallographic analysis is performed on the joint to ensure uniform microstructure in the welding area;

[0037] d. Flattening treatment: Use a hydraulic flattening device to flatten the seeded plate after welding. Control the flattening force at 110 kN, the flattening speed at 7 mm / min, and the flattening stroke at 100 mm. During the flattening process, the flattening device is equipped with a multi-point support structure to ensure uniform force on the seeded plate during flattening, avoid local deformation. The device is equipped with a pressure sensor and a displacement sensor to monitor the flattening force and the deformation of the seeded plate in real time, ensure that the flatness of the seeded plate reaches ±0.1 mm, and conduct a final inspection with a laser flatness measuring instrument. After flattening, the surface of the seeded plate is subjected to anti-oxidation treatment and a rust-proof coating is sprayed, with a coating thickness of 5 μm to ensure the corrosion resistance of the seeded plate.

[0038] The above has introduced the technical solutions provided by the embodiments of the present invention in detail. Specific examples are used herein to elaborate on the principles and implementation manners of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those of ordinary skill in the art, according to the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for processing and manufacturing a titanium-copper composite material titanium-copper seed plate, characterized in that: The following steps are involved: a. Preparation of composite materials: The titanium plate and the copper plate are composited into the raw materials of the titanium-copper conductive rod by explosion welding process; b. Machining: machining the composite material to make a conductive rod; c. Welding process: welding the titanium end of the conductive rod to the titanium plate; d. Flattening treatment: Flatten the welded plate to ensure flatness.

2. The method for manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: In step a, the thickness of the titanium plate and the copper plate are both 2-3 mm.

3. The method for manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: In step a, the bonding strength between the titanium plate and the copper plate of the composite material is greater than 30 MPa.

4. The method for manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: The diameter of the conductive rod in step b is 20-30 mm.

5. The method for processing and manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: In the step b, the cutting speed is controlled at 100-150 m / min, the feed rate is 0.1-0.2 mm / r, and the surface roughness Ra value of the conductive rod is less than 0.8 μm.

6. The method for processing and manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: The thickness of the titanium plate in step c is 4-5 mm.

7. The method for processing and manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: In the step c, the welding power is 10-12 kW, the welding speed is 8-10 mm / s, the welding current is 200-220 A, and the welding voltage is 50-55 V.

8. The method for manufacturing a titanium-copper composite material titanium-copper seed plate according to claim 1, characterized in that: The controlled flattening force of the flattening treatment in step d is 100-110 kN, and the flattening speed is 5-7 mm / min, ensuring that the flatness of the seed plate reaches ±0.1 mm.