Solder strip continuous casting equipment and preparation method

Abstract

The invention relates to solder strip continuous casting equipment and a preparation method, the solder strip continuous casting equipment is only composed of a smelting furnace, a heat preservation furnace, a crystallizer and a traction device, an outlet of the smelting furnace is directly connected with an inlet of the heat preservation furnace through a solder melt flow channel, an outlet of the heat preservation furnace is directly connected with an inlet of the crystallizer, and a heating device is arranged on the heat preservation furnace. A thermocouple, a cooling system and a crystallization solder output device are arranged on the crystallizer, the thermocouple, the cooling system, the crystallization solder output device and the traction device are all connected with the control system, and the control system always keeps the crystallization temperature within a set crystallization temperature range through the heating device according to a temperature signal transmitted by the thermocouple. The preparation method of the welding strip only needs three procedures of welding flux smelting, welding flux casting and drawing forming. The device is simple in structure, convenient to use and high in production efficiency, only needs three procedures and corresponding equipment, saves cost, is relatively environment-friendly, and is good in final product performance.

Description

Technical Field

[0001] The present application relates to a welding strip continuous casting device and a preparation method, which are mainly suitable for the production equipment and production of silver-copper alloy welding strips. Background Art

[0002] The traditional production process for silver-copper solder strips is as follows: smelting → casting → cutting → shot blasting → extrusion → acid soaking → rolling. Cutting, shot blasting, and acid soaking are "non-value-added" steps designed to repair surface defects. The cutting process not only reduces yield, but also poses the risk of incomplete removal of shrinkage, leading to failure. The shot blasting process creates significant noise and dust hazards, posing a high risk for equipment use. Acid soaking increases production costs, consumes water resources, and pollutes the environment. Furthermore, existing technologies suffer from internal pores and high internal gas content (>200 ppm) within the ingot, which can lead to pores and / or cracking in the solder strip during subsequent extrusion and rolling. This, along with poor grain size control, can also affect the performance of the final product. Summary of the Invention

[0003] The technical problem solved by the present application is to provide a welding strip continuous casting device and its preparation method which has a simple preparation method, high production efficiency, requires only three steps and corresponding equipment, saves costs, and is relatively environmentally friendly.

[0004] The technical solution adopted by the present application to solve the above-mentioned technical problems includes: a welding strip continuous casting device, which is composed only of a melting furnace, a holding furnace, a crystallizer, and a traction device. The melting furnace outlet is directly connected to the holding furnace inlet through a solder melt flow channel, and the holding furnace outlet is directly connected to the crystallizer inlet. The holding furnace is provided with a heating device for accurately controlling the temperature of the crystallization area. The crystallizer is provided with a thermocouple, a cooling system, and a crystallization solder output device. The thermocouple, cooling system, crystallization solder output device, and traction device are all connected to a control system. The control system controls the power of the heating device based on the temperature signal transmitted by the thermocouple when the crystallization temperature deviates from the normal range, so that the crystallization temperature is always kept within the set crystallization temperature range. The control system controls the cooling system to work in a timely manner. The welding strip continuous casting device described in the present application is composed only of a melting furnace, a holding furnace, a crystallizer, and a traction device, which greatly simplifies the overall equipment structure and saves the three processes of cutting, shot blasting, and acid soaking, as well as the equipment required for at least the last two processes.

[0005] A thermocouple mounting hole is provided on the graphite sleeve of the crystallizer described in the present application near the inlet of the crystallized solder output device. The thermocouple is installed in the thermocouple mounting hole so that the temperature detected by the thermocouple is relatively close to the temperature of the solder melt before crystallization.

[0006] In this application, a roller is also provided between the crystallizer outlet and the traction device to facilitate the transportation of the welding strip.

[0007] The technical solution adopted by the present application to solve the above technical problems also includes: a method for preparing a welding strip, which is characterized by using the above welding strip continuous casting equipment and includes the following steps: S1: melting solder, the melted solder liquid enters the holding furnace through the solder liquid flow channel; S2: casting solder; S21: The solder melt in the holding furnace is transported to the crystallizer; S22: The thermocouple detects the temperature signal and transmits it to the control system. The control system adjusts the power of the heating device according to the temperature signal most recently detected by the thermocouple until the crystallization temperature reaches the set crystallization temperature range; S24: Turn on the crystallized solder output device, turn on the cooling system, output the solder to form a primary solder strip and output it to the traction device; S3: The pulling device pulls the primary welding strip and draws it to form the final welding strip (drawing forming).

[0008] The solder strip preparation method of the present application only requires three steps: melting solder, casting solder, and drawing and forming, which greatly improves labor efficiency, saves costs, is relatively environmentally friendly, and improves product performance.

[0009] In step S24, the surface temperature gradient of the solder melt is ≤80°C / m when it is cooled, so as to prevent the solder temperature from dropping too fast or too slow, causing poor connection of the solder ribbon or poor mechanical properties.

[0010] In this application, step S23 can be set between step S22 and step S24. S23: The control system controls the inlet temperature of the crystallized solder output device to maintain within the set crystallization temperature range for a period of time, so as to allow for static degassing and reduce the gas content of the solder melt.

[0011] Compared with the existing technology, the present invention has the following advantages and effects: simple structure, easy use, high production efficiency, only three steps and corresponding equipment are required, cost saving, relative environmental protection, and good final product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the welding strip continuous casting equipment according to an embodiment of the present application.

[0013] Figure 2 yes Figure 1 A top-down rotation diagram of .

[0014] Figure 3 It is a three-dimensional schematic diagram of an embodiment of the present application.

[0015] Figure 4 It is a front view schematic diagram of the crystallizer of the embodiment of the present application.

[0016] Figure 5 yes Figure 4 BB cross-sectional diagram.

[0017] In the figure: melting furnace 1, solder melt flow channel 11, holding furnace 2, crystallizer 3, graphite sleeve 31, silver-copper alloy (solder) melt channel 311, crystallized solder output device 32, thermocouple mounting hole 33, cooling system 34 (special case is a secondary water cooling system), traction device 4, roller 41, subsequent processing device 5 (sawing machine or winding device). DETAILED DESCRIPTION

[0018] The present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are intended to explain the present application but the present application is not limited to the following examples.

[0019] See also Figures 1 to 5 The structural design feature of the welding strip continuous casting equipment of the embodiment of the present application is that it only consists of a melting furnace 1, a holding furnace 2, a crystallizer 3, and a traction device 4. The outlet of the melting furnace 1 is directly and sealedly connected to the inlet of the holding furnace 2 through a solder melt flow channel 11. The outlet of the holding furnace 2 is directly and sealedly connected to the inlet of the crystallizer 3. The outlet of the crystallizer 3 ( Figure 5 The right side of the drawing device 4 faces the holding furnace 2. A heating device is installed on the holding furnace 2 to precisely control the temperature of the crystallization zone. The crystallizer 3 is equipped with a temperature sensor (thermocouple), a crystallized solder output device 32, and a cooling system 34. The thermocouple, crystallized solder output device 32, and cooling system 34 are all connected to a conventional control system (not shown). The control system controls the power of the heating device based on the temperature signal transmitted by the thermocouple when the crystallization temperature deviates from the normal range, ensuring that the crystallization temperature remains within the set crystallization temperature range. The welding strip continuous casting equipment described in this application consists solely of a melting furnace 1, a holding furnace 2, a crystallizer 3, and a drawing device 4. This significantly simplifies the overall equipment structure and eliminates the need for cutting, shot blasting, and acid soaking processes, as well as the equipment required for at least the last two processes.

[0020] The graphite sleeve 31 of the crystallizer 3 of the present application is close to the inlet of the crystallization solder output device 32 ( Figure 5 A thermocouple mounting hole 33 is provided at the left end of the crystallized solder output device 32, and a thermocouple is installed in the thermocouple mounting hole so that the temperature detected by the thermocouple is relatively close to the temperature of the solder melt before crystallization.

[0021] In the present application, a roller 41 is further provided between the outlet of the crystallizer 3 and the traction device 4 to facilitate the transportation of the welding strip.

[0022] The graphite sleeve 31 , the crystallized solder output device 32 , the thermocouple, and the cooling system 34 of the present application are all prior art.

[0023] The preparation method of the welding strip described in this application is as follows: S1: melting solder, the melted solder liquid enters the holding furnace 2 through the solder liquid flow channel; S2: casting solder; S21: The solder melt in the holding furnace 2 is transported to the crystallizer 3; S22: The thermocouple detects the inlet temperature (crystallization temperature) signal of the crystallized solder output device 32 and transmits it to the control system. The control system adjusts the power of the heating device according to the temperature signal most recently detected by the thermocouple until the inlet temperature of the crystallized solder output device 32 reaches the set crystallization temperature range. S24: The control system turns on the crystallized solder output device 32 and the cooling system 34 (water pressure 0.2-0.8 MPa), and the solder is output to form a primary solder strip (intermediate product) and output to the traction device 4; S3: The traction device 4 tractions the primary welding strip and draws it to form a final welding strip.

[0024] When the solder melt passes through the cooling system 34 and is cooled, the surface temperature gradient is ≤80°C / m, so as to prevent the solder temperature from dropping too fast or too slow, thereby causing poor connection of the solder strip or poor mechanical properties.

[0025] Rapid cooling of a silver-copper alloy melt may result in fine grains, while slow cooling produces coarse grains. Observing the crystallization temperature can help determine the optimal cooling strategy, thereby controlling grain size and improving the material's mechanical properties. Because graphite has high thermal conductivity (approximately 80-150 W / m*K), it can quickly transfer heat from the melt. Therefore, the position near the graphite sleeve 31 and the head of the crystallization solder dispensing device 32 best reflects the crystallization (initial) temperature.

[0026] In this application, step S23 can be set between step S22 and step S24. S23: The control system controls the inlet temperature of the crystallized solder output device 32 to maintain within the set crystallization temperature range for a period of time (usually 5 to 10 minutes) to allow for static degassing and reduce the gas content of the solder melt.

[0027] The main purpose of this application 1. Efficiency improvement: The production efficiency of a single device is 275% higher than that of traditional processes; 2. Quality optimization: internal gas content ≤ 200ppm (traditional process ≥ 200ppm); 3. Cost reduction: The yield rate increased from 50% to 90%, and the discharge of pickling waste liquid was reduced by 80%.

[0028] This application is mainly used to produce silver-copper alloy welding strips (144mm*6mm), with a melting temperature of 1200-1400℃; The drawing speed is between 20mm / s and 50mm / s, and there are no bubbles or cracks in the welding strip after drawing.

Claims

1. A welding strip continuous casting device, characterized by: The welding strip continuous casting equipment is composed only of a melting furnace, a holding furnace, a crystallizer, and a traction device. The outlet of the melting furnace is directly connected to the inlet of the holding furnace through a solder melt flow channel, and the outlet of the holding furnace is directly connected to the inlet of the crystallizer. The holding furnace is provided with a heating device, and the crystallizer is provided with a thermocouple, a cooling system, and a crystallized solder output device. The thermocouple, cooling system, crystallized solder output device, and traction device are all connected to a control system. The control system always keeps the crystallization temperature within the set crystallization temperature range through the heating device based on the temperature signal transmitted by the thermocouple.

2. The welding strip continuous casting equipment according to claim 1, characterized in that: A thermocouple mounting hole is provided on the graphite sleeve of the crystallizer near the inlet of the crystallized solder output device, and the thermocouple is mounted in the thermocouple mounting hole.

3. A method for preparing a welding strip, characterized in that The method is carried out using the welding strip continuous casting equipment according to claim 1 or 2 and includes the following steps: S1: melting solder, the melted solder liquid enters the holding furnace through the solder liquid flow channel; S2: casting solder; S21: The solder melt in the holding furnace is transported to the crystallizer; S22: The thermocouple detects a temperature signal and transmits it to the control system. The control system adjusts the power of the heating device according to the temperature signal most recently detected by the thermocouple until the inlet temperature of the crystallization solder output device reaches the set crystallization temperature range. S24: Turn on the crystallized solder output device, turn on the cooling system, output the solder to form a primary solder strip and output it to the traction device; S3: The traction device pulls the primary welding strip and draws it to form the final welding strip.

4. The method for preparing a welding strip according to claim 3, wherein: When the solder melt is cooled in step S24, the surface temperature gradient is ≤80°C / m.

5. The method for preparing a welding strip according to claim 3, wherein: In this application, step S23 is provided between step S22 and step S24. S23: The control system controls the inlet temperature of the crystallization solder output device to maintain within the set crystallization temperature range for a period of time.

6. The method for preparing a welding strip according to claim 3, wherein: The drawing speed is between 20mm / s and 50mm / s.

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