Tinned copper clad steel and its processing technology, production line and application in grounding

Abstract

The present invention relates to a tin-plated copper-clad steel and its processing technology, production line and application in grounding. A tin-plated copper-clad steel tightly wraps naval copper on the outside of a steel substrate, the outside of the naval copper layer is covered with a tin-plated layer, and the outside of the steel substrate is coated with a transition coating. The copper used in the copper-clad steel material of the present invention is naval copper, which has much better corrosion resistance than unit metal copper. Therefore, it is very suitable for use as a grounding material. Since naval copper cannot be attached to the surface of a steel substrate by electroplating, the composite of naval copper and a steel substrate can be achieved by the method of the present invention.

Description

Technical Field

[0001] The invention relates to the technical field of metal composite materials, and in particular to tinned copper-clad steel and its processing technology, production line and application in grounding. Background Art

[0002] The quality of the grounding system directly affects the stability and reliability of the distribution network line operation. However, some problems are often encountered in the construction, operation and maintenance of the grounding system, which seriously affect the construction efficiency and safe operation. The traditional grounding device has the following disadvantages: 1. The excavation of the grounding foundation is large. 2. The land expropriation policy is difficult to deal with. 3. The grounding body is easily corroded in the soil. The soil resistivity is generally 25-50 ohm·m, the pH value is 5.0-6.5, and the acidity is high. It is easy to corrode steel. The steel corrodes to produce ferric oxide, which is fragile and easy to peel off. It cannot isolate corrosion and cannot protect the internal steel from corrosion, which will also cause the grounding resistance to increase year by year.

[0003] The corrosion resistance of copper is more than ten times that of steel and more than three times that of galvanized steel. The corrosion resistance of copper-plated steel is close to that of pure copper. The surface of copper will produce strong oxides, which have a good protective effect on the internal materials and block the formation of further corrosion. Copper-clad steel grounding electrode, also known as copper-clad steel grounding rod, is another name for electroplated copper-clad steel grounding electrode. It has the advantages of thick copper layer, low resistance, strong corrosion resistance, high strength, easy installation, good electrical connection performance, good adhesion, and no peeling. At present, the production methods of copper-clad steel composite materials on the market mostly use electroplating methods, hot dip plating methods or horizontal continuous casting methods. The electroplating method is to evenly plate copper on the surface of steel. The traditional electroplating method for preparing copper-clad steel uses unit metal copper. Admiralty copper is an alloy of zinc, tin and copper. It has good corrosion resistance and belongs to a multi-element alloy. Therefore, admiralty copper cannot be processed by electroplating to prepare copper-clad steel. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above technical problems and to provide a tinned copper clad steel and its processing technology, production line and application in grounding.

[0005] In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a tin-plated copper-clad steel, in which naval copper is tightly wrapped on the outside of a steel substrate, and the outside of the naval copper layer is covered with a tin-plated layer.

[0006] As a further optimization of the tinned copper clad steel of the present invention: the exterior of the steel substrate is coated with a transition coating.

[0007] As a further optimization of the tin-plated copper-clad steel of the present invention: the transition coating is made of the following raw materials in weight percentage: zirconium powder 70-80%, titanium powder 1-5%, tin powder 0.5-2%, carbon powder 0.1-0.5%, pinene alcohol 2-5% and dichloromethane 15-20%.

[0008] A processing technology for tinned copper clad steel specifically comprises the following steps:

[0009] S1. Use acetone or alcohol to clean the grease on the outer wall of the solid steel rod and the inner wall of the naval copper tube, then polish and grind them, use ultrasonic cleaning, and dry them for later use;

[0010] S2, taking the raw materials of the transition coating, adding them into the soaking tank for thorough mixing, then placing the solid steel rod treated in step S1 into the soaking tank for standing, and performing dip coating of the transition coating on the surface of the solid steel rod. After the dip coating is completed, the solid steel rod is transferred to the exhaust chamber, and the coating is initially cured through the exhaust port above the exhaust chamber. Finally, the solid steel rod after the initial curing of the coating is transferred to the sintering furnace, slowly heated to 600°C and kept warm for 30-45 minutes, then argon gas is introduced into the sintering furnace, heated to 720°C and kept warm for 1-2 hours, to obtain a solid steel rod with a transition coating, which is then used for standby;

[0011] S3. Put the solid steel rod into the naval copper tube by pressure equipment to obtain a blank, then use the drawing equipment to draw the naval copper tube to reduce the outer diameter of the naval copper tube, so that the inner wall of the naval copper tube and the outer wall of the solid steel rod are closely attached together, then put the blank after drawing into a sealed environment, evacuate and weld the two ends of the blank in a vacuum environment to obtain two blanks, finally place the two blanks in a heating furnace for heating, and make them into copper-clad steel composite materials by hot rolling process;

[0012] S4, placing the copper-clad steel composite material into a tin furnace, plating tin on the surface of the copper-clad steel composite material, and finally obtaining a tin-plated copper-clad steel material.

[0013] As a further optimization of the processing technology of tin-plated copper-clad steel of the present invention: the first heating rate in S2 is 40-50°C / min, and the second heating rate is 10-15°C / min.

[0014] As a further optimization of the processing technology of tin-plated copper-clad steel of the present invention: the blank in S3 is placed in a heating furnace and heated to 850-900°C.

[0015] A processing production line for tin-plated copper-clad steel materials comprises a material transfer mechanism and a dipping pool, a coating curing chamber, a sintering chamber, a pressure device, a drawing device, a vacuum welding chamber, a hot rolling device and a tinning furnace connected in series in a process sequence, the material transfer mechanism comprises a walking track arranged above the dipping pool, the coating curing chamber, the sintering chamber, the pressure device, the drawing device, the vacuum welding chamber, the hot rolling device and the tinning furnace, and a material grabbing arm hung on the walking track, the dipping pool comprises a pool body for accommodating a dipping liquid and a plurality of agitators arranged at the bottom of the pool body, the coating curing chamber comprises a chamber body sealed on all sides and a material placement rack arranged in the chamber body, a plurality of exhaust holes are arranged on the top of the chamber body, the sintering chamber comprises a chamber body and a heating assembly arranged in the chamber body, an argon gas inlet hole is arranged on the side wall of the chamber body, the vacuum welding chamber comprises a chamber body and an electron beam welding device arranged in the chamber body, and a vacuum pump is connected to the chamber body through a pipeline, the coating curing chamber, the sintering chamber and the vacuum welding chamber are all provided with a discharge port on the top, and a chamber door is provided at the discharge port.

[0016] The application of the tinned copper clad steel of the present invention in grounding is to manufacture grounding electrodes.

[0017] The tinned copper clad steel of the present invention has the following beneficial effects:

[0018] 1. The copper used in the copper-clad steel material of the present invention is naval copper, which has much better anti-corrosion performance than unit metal copper. Therefore, it is very suitable for use as a grounding material. Since naval copper cannot be attached to the surface of a steel substrate by electroplating, the method of the present invention can realize the composite of naval copper and a steel substrate;

[0019] 2. In the copper-clad steel material of the present invention, a transition coating is also coated between the naval copper and the steel substrate. The transition coating is composed of zirconium powder, titanium powder, tin powder, carbon powder and a binder. After a specific sintering process, a coating with a microporous structure can be formed on the surface of the steel substrate. The coating can not only enhance the bonding force between the naval copper and the steel matrix, but also improve the electrical conductivity of the copper-clad steel material, making it suitable for use as a grounding material. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a tin-plated copper-clad steel material processing production line of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a grounding electrode made of tinned copper-clad steel according to the present invention;

[0022] Markings in the figure: 1. Material transfer mechanism, 2. Dipping tank, 3. Coating curing chamber, 4. Sintering chamber, 5. Pressure equipment, 6. Drawing equipment, 7. Vacuum welding chamber, 8. Hot rolling equipment, 9. Tinning furnace, 10. Receiving tank, 11. Liquid guide trough, 12. Tip, 13. Tinned copper-clad steel rod, 14. Copper tube, 1-1. Walking track, 1-2. Material grabbing arm, 2-1. Tank body, 2-2. Agitator, 3-1. Material placement rack, 3-2. Exhaust hole, 4-1. Heating component, 4-2. Argon gas inlet hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] The technical solution of the present invention is further described below in conjunction with specific implementation methods.

[0025] Example 1

[0026] A tinned copper clad steel, with naval copper tightly wrapped on the outside of the steel base, and the naval copper layer is covered with a tinned layer on the outside. The outside of the steel base is coated with a transition coating.

[0027] The transition coating is made of the following raw materials in weight percentage: 65% zirconium powder, 2.5% titanium powder, 2% tin powder, 0.5% carbon powder, 5% pine oil and 20% dichloromethane. The particle size of the zirconium powder, titanium powder, tin powder and carbon powder is 50-100 μm.

[0028] Example 2

[0029] A tinned copper clad steel, with naval copper tightly wrapped on the outside of the steel base, and the naval copper layer is covered with a tinned layer on the outside. The outside of the steel base is coated with a transition coating.

[0030] The transition coating is made of the following raw materials in weight percentage: 80% zirconium powder, 1% titanium powder, 0.5% tin powder, 0.1% carbon powder, 2% pineneol and 16.4% dichloromethane. The particle sizes of the zirconium powder, titanium powder, tin powder and carbon powder are 50-100 μm.

[0031] Example 3

[0032] A tinned copper clad steel, with naval copper tightly wrapped on the outside of the steel base, and the naval copper layer is covered with a tinned layer on the outside. The outside of the steel base is coated with a transition coating.

[0033] The transition coating is made of the following raw materials in weight percentage: 73.5% zirconium powder, 2% titanium powder, 1% tin powder, 0.5% carbon powder, 3% pine oil and 20% dichloromethane. The particle size of the zirconium powder, titanium powder, tin powder and carbon powder is 50-100 μm.

[0034] Example 4

[0035] A processing technology for tinned copper clad steel specifically comprises the following steps:

[0036] S1. Use acetone or alcohol to clean the grease on the outer wall of the solid steel rod and the inner wall of the naval copper tube, then polish and grind them, use ultrasonic cleaning, and dry them for later use;

[0037] S2. Take the raw materials of the transition coating according to the proportion of Example 1, add them into the immersion tank for thorough mixing, then place the solid steel rod treated in step S1 into the immersion tank for standing, and dip-coat the transition coating on the surface of the solid steel rod. After the dipping is completed, transfer the solid steel rod to the exhaust chamber, and perform initial curing treatment of the coating through the exhaust port above the exhaust chamber. Finally, transfer the solid steel rod after the initial curing treatment of the coating to the sintering furnace, slowly heat up (heating rate of 40°C / min) to 600°C and keep warm for 30 minutes, then introduce argon into the sintering furnace, heat up (heating rate of 15°C / min) to 720°C and keep warm for 2 hours, to obtain a solid steel rod with a transition coating, and set it aside; in the sintering process, it is divided into primary sintering and secondary sintering, the sintering temperatures of the two times are different, and the sintering temperature of the second time is higher than the first time. The internal structure of the coating is uniformly cured through the first sintering. When the internal structure is basically finalized, the temperature is increased again to further harden the surface layer of the coating, thereby improving the hardness of the coating. In addition, there are strict requirements on the heating rate during the two sintering processes, otherwise it will lead to uneven solidification of the internal structure of the coating, or cause cracks to appear during the hardening process of the surface layer.

[0038] S3. Put the solid steel rod into the naval copper tube by pressure equipment to obtain a blank, then use the drawing equipment to draw the naval copper tube to reduce the outer diameter of the naval copper tube, so that the inner wall of the naval copper tube and the outer wall of the solid steel rod are closely attached together, then put the blank after drawing into a sealed environment, evacuate and weld the two ends of the blank in a vacuum environment to obtain two blanks, finally place the two blanks in a heating furnace for heating, and make them into copper-clad steel composite materials by hot rolling process;

[0039] S4, placing the copper-clad steel composite material into a tin furnace, plating tin on the surface of the copper-clad steel composite material, and finally obtaining a tin-plated copper-clad steel material.

[0040] Example 5

[0041] S1. Use acetone or alcohol to clean the grease on the outer wall of the solid steel rod and the inner wall of the naval copper tube, then polish and grind them, use ultrasonic cleaning, and dry them for later use;

[0042] S2. Take the raw materials of the transition coating according to the proportion of Example 2, add them into the soaking tank for thorough mixing, then place the solid steel rod treated in step S1 into the soaking tank for standing, dip-coat the transition coating on the surface of the solid steel rod, after the dip-coating is completed, transfer the solid steel rod to the exhaust chamber, perform initial curing treatment of the coating through the exhaust port above the exhaust chamber, finally transfer the solid steel rod after the initial curing treatment of the coating to the sintering furnace, slowly heat up (heating rate of 50°C / min) to 600°C and keep warm for 45 minutes, then introduce argon into the sintering furnace, heat up (heating rate of 10°C / min) to 720°C and keep warm for 1 hour, to obtain a solid steel rod with a transition coating, for standby use;

[0043] S3. Put the solid steel rod into the naval copper tube by pressure equipment to obtain a blank, then use the drawing equipment to draw the naval copper tube to reduce the outer diameter of the naval copper tube, so that the inner wall of the naval copper tube and the outer wall of the solid steel rod are closely attached together, then put the blank after drawing into a sealed environment, evacuate and weld the two ends of the blank in a vacuum environment to obtain two blanks, finally place the two blanks in a heating furnace for heating, and make them into copper-clad steel composite materials by hot rolling process;

[0044] S4, placing the copper-clad steel composite material into a tin furnace, plating tin on the surface of the copper-clad steel composite material, and finally obtaining a tin-plated copper-clad steel material.

[0045] Example 6

[0046] S1. Use acetone or alcohol to clean the grease on the outer wall of the solid steel rod and the inner wall of the naval copper tube, then polish and grind them, use ultrasonic cleaning, and dry them for later use;

[0047] S2. Take the raw materials of the transition coating according to the proportion of Example 3, add them into the soaking tank for thorough mixing, then place the solid steel rod treated in step S1 into the soaking tank for standing, dip-coat the surface of the solid steel rod with the transition coating, after the dip-coating is completed, transfer the solid steel rod to the exhaust chamber, perform the initial curing treatment of the coating through the exhaust port above the exhaust chamber, finally transfer the solid steel rod after the initial curing treatment of the coating to the sintering furnace, slowly heat up (heating rate is 45°C / min) to 600°C and keep warm for 40 minutes, then introduce argon into the sintering furnace, heat up (heating rate is 12°C / min) to 720°C and keep warm for 1.5 hours, to obtain a solid steel rod with a transition coating, for standby use;

[0048] S3. Put the solid steel rod into the naval copper tube by pressure equipment to obtain a blank, then use the drawing equipment to draw the naval copper tube to reduce the outer diameter of the naval copper tube, so that the inner wall of the naval copper tube and the outer wall of the solid steel rod are closely attached together, then put the blank after drawing into a sealed environment, evacuate and weld the two ends of the blank in a vacuum environment to obtain two blanks, finally place the two blanks in a heating furnace for heating, and make them into copper-clad steel composite materials by hot rolling process;

[0049] S4, placing the copper-clad steel composite material into a tin furnace, plating tin on the surface of the copper-clad steel composite material, and finally obtaining a tin-plated copper-clad steel material.

[0050] Example 7

[0051] A grounding electrode, such as Figure 2 As shown, it is composed of a pointed head 12, a tinned copper clad steel rod 13 and a copper tube 14. The pointed head 12 is screwed on the head end of the tinned copper clad steel rod 13 through a thread, and the copper tube 14 is screwed on the tail end of the tinned copper clad steel rod 13 through a thread.

[0052] Example 8

[0053] like Figure 1 As shown: a processing production line for tinned copper-clad steel materials, including a material transfer mechanism 1 and a dipping pool 2, a coating curing chamber 3, a sintering chamber 4, a pressure device 5, a drawing device 6, a vacuum welding chamber 7, a hot rolling device 8 and a tinning furnace 9 connected in series in a process sequence. The process sequence is the material transfer route in the entire processing and production process. The dipping pool 2 is used to dip-coat a layer of transition coating on the outer surface of the raw steel substrate, and then the steel substrate dipped with the transition coating is transferred to the coating curing chamber 3, in which the solvent in the transition coating is evaporated away, and the transition coating is initially cured, and then the steel substrate covered with the transition coating is transferred to the sintering chamber 4 for high-temperature sintering, so that the transition coating is completely cured on the surface of the steel substrate, and then the steel substrate with the transition coating is inserted into the naval copper tube through the pressure equipment 5, and the naval copper tube is drawn by the drawing equipment 6, so that the naval copper tube and the steel substrate are tightly fitted, and then the drawn material is transferred to the vacuum welding chamber 7, and the two ends of the material are welded in a vacuum environment. The welded material is heated and rolled by the hot rolling equipment 8 to obtain the material of the required shape, and finally the outside of the material is tinned in the tinning furnace 9, that is, the processing and production of tinned copper clad steel material is completed.

[0054] The material transfer mechanism 1 includes a walking track 1-1 arranged above the dipping pool 2, the coating curing chamber 3, the sintering chamber 4 and the pressure equipment 5, and a material grabbing arm 1-2 hung on the walking track 1-1. The function of the material transfer mechanism 1 is to transfer the material, and the material processed in the previous process is transferred to the next process through the material grabbing arm 1-2. It should be noted that in order to improve production efficiency, multiple steel matrix raw materials can be fixed on the material rack, and then the material rack can be hoisted to achieve efficient processing of multiple materials.

[0055] The dipping pool 2 includes a pool body 2-1 for containing the dipping solution and a plurality of agitators 2-2 arranged at the bottom of the pool body 2-1. The dipping pool 2 contains the prepared dipping solution, which is a solution prepared according to the formula of the transition coating. The plurality of agitators 2-2 at the bottom of the pool body 2-1 are used to prevent the precipitation of the dipping solution.

[0056] The coating curing chamber 3 includes a chamber body which is sealed on all sides and a material placement rack 3-1 arranged in the chamber body, and a plurality of exhaust holes 3-2 are arranged on the top of the chamber body. A material receiving pool 10 is arranged below the material placement rack 3-1 of the coating curing chamber 3, and the material receiving pool 10 is connected to the dipping pool 2 through an inclined liquid guide groove 11, and one end of the liquid guide groove 11 connected to the material receiving pool 10 is arranged higher than the other end. The liquid guide groove 11 is located directly below the walking track 1-1. When the dip-coated steel substrate is initially cured on the material placement rack 3-1, the dripping dipping liquid enters the material receiving pool 10 and flows back to the dipping pool 2 through the liquid guide groove 11.

[0057] The exhaust hole 3-2 of the coating curing chamber 3 is connected to the solvent recovery tank through a pipeline and a vacuum pump. The exhaust hole accelerates the evaporation of the solvent, and the solvent entrained in the collected gas is recycled through the solvent recovery tank.

[0058] The sintering chamber 4 includes a chamber body and a heating assembly 4-1 disposed in the chamber body, and an argon gas inlet hole 4-2 is disposed on the side wall of the chamber body. The heating assembly 4-1 is a basic component of the sintering chamber, which is used to increase the temperature in the sintering chamber to achieve the purpose of high-temperature sintering. The argon gas inlet hole 4-2 is used to fill argon gas into the chamber during the sintering process to form an argon gas environment. After sintering, the transition coating is tightly attached to the surface of the steel substrate, and after being combined with the naval copper sleeve, the conductive properties of the final copper-clad steel material can be significantly improved.

[0059] The pressure equipment 5 and the drawing equipment 6 are both mature presses and drawing machines in the prior art. The working pressure of the press is more suitable at 50-200 tons, and the working pressure of the drawing machine is more suitable at 20-200 tons. The function of the press is to insert the steel rod with the transition coating into the naval copper tube, and the function of the drawing machine is to draw the naval copper tube so that the two fit closely.

[0060] The vacuum welding chamber 7 includes a chamber body and an electron beam welding device 7-1 arranged in the chamber body, and a vacuum pump 7-2 is connected to the chamber body through a pipeline. The vacuum pump 7-2 can form a vacuum environment in the chamber body, thereby extracting the air between the copper and steel in the copper-clad steel material placed in the chamber body, and then completing the welding of the two ends of the material in a vacuum environment, and forming a seal between the copper tube and the steel substrate through welding.

[0061] The hot rolling equipment 8 and the tinning furnace 9 adopt the mature hot rolling mill and tinning equipment in the prior art, which will not be described in detail here. The heating furnace is not shown in the figure.

[0062] Comparative Example 1

[0063] A tin-plated copper-clad steel composite material, whose processing technology is basically the same as that of Example 3, except that: the transition coating is omitted.

[0064] Conductivity test

[0065] The conductive properties of the tin-plated copper-clad steel composite materials of Examples 4-6 and Comparative Example 1 were tested, and the results showed that the resistivity of Examples 4-6 was significantly lower than that of Comparative Example 1, which shows that the transition coating has a great influence on the conductive ability of the tin-plated copper-clad steel composite materials.

[0066] 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 may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A processing technology for tin-plated copper-clad steel, the tin-plated copper-clad steel specifically comprises: tightly wrapping naval copper on the outside of a steel substrate, the outside of the naval copper layer is covered with a tin-plated layer, the outside of the steel substrate is coated with a transition coating, and the transition coating is made of the following raw materials in weight percentage: zirconium powder 70-80%, titanium powder 1-5%, tin powder 0.5-2%, carbon powder 0.1-0.5%, pine alcohol 2-5% and dichloromethane 15-20%, characterized in that: The processing technology includes the following steps: S1. Use acetone or alcohol to clean the grease on the outer wall of the solid steel rod and the inner wall of the naval copper tube, then polish and grind them, use ultrasonic cleaning, and dry them for later use; S2, taking the raw materials of the transition coating, adding them into the soaking tank for thorough mixing, then placing the solid steel rod treated in step S1 into the soaking tank for standing, and performing dip coating of the transition coating on the surface of the solid steel rod. After the dip coating is completed, the solid steel rod is transferred to the exhaust chamber, and the coating is initially cured through the exhaust port above the exhaust chamber. Finally, the solid steel rod after the initial curing of the coating is transferred to the sintering furnace, and the temperature is slowly increased to 600°C at a heating rate of 40-50°C / min and kept warm for 30-45min, then argon is introduced into the sintering furnace, and the temperature is increased to 720°C at a heating rate of 10-15°C / min and kept warm for 1-2h, so as to obtain a solid steel rod with a transition coating for standby use; S3. Put the solid steel rod into the naval copper tube by pressure equipment to obtain a blank, then use the drawing equipment to draw the naval copper tube to reduce the outer diameter of the naval copper tube, so that the inner wall of the naval copper tube and the outer wall of the solid steel rod are closely attached together, then put the blank after drawing into a sealed environment, evacuate and weld the two ends of the blank in a vacuum environment to obtain two blanks, finally place the two blanks in a heating furnace for heating, and make them into copper-clad steel composite materials by hot rolling process; S4, placing the copper-clad steel composite material into a tin furnace, plating tin on the surface of the copper-clad steel composite material, and finally obtaining a tin-plated copper-clad steel material.

2. The processing technology of tinned copper clad steel as claimed in claim 1, characterized in that: The blank in S3 is placed in a heating furnace and heated to 850-900°C.

3. A production line for the processing technology of tinned copper clad steel according to claim 1, characterized in that: The invention comprises a material transfer mechanism (1) and a dipping tank (2), a coating curing chamber (3), a sintering chamber (4), a pressure device (5), a drawing device (6), a vacuum welding chamber (7), a hot rolling device (8) and a tinning furnace (9) which are connected in series in a process sequence. The material transfer mechanism (1) comprises a walking track (1-1) arranged above the dipping tank (2), the coating curing chamber (3), the sintering chamber (4), the pressure device (5), the drawing device (6), the vacuum welding chamber (7), the hot rolling device (8) and the tinning furnace (9) and a material grabbing arm (1-2) hung on the walking track (1-1). The dipping tank (2) comprises a tank body (2-1) for accommodating a dipping liquid and a material grabbing arm (1-2) arranged A plurality of stirrers (2-2) are provided at the bottom of the pool body (2-1); the coating curing chamber (3) comprises a chamber body which is sealed on all sides and a material placement rack (3-1) arranged in the chamber body; a plurality of exhaust holes (3-2) are arranged on the top of the chamber body; the sintering chamber (4) comprises a chamber body and a heating component (4-1) arranged in the chamber body; an argon gas inlet hole (4-2) is arranged on the side wall of the chamber body; the vacuum welding chamber (7) comprises a chamber body and an electron beam welding device (7-1) arranged in the chamber body; a vacuum pump (7-2) is connected to the chamber body via a pipeline; a discharge port is arranged on the top of each of the coating curing chamber (3), the sintering chamber (4) and the vacuum welding chamber (7); and a chamber door is arranged at the discharge port.

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