Continuous casting system and continuous casting method for silver alloy

Abstract

The invention relates to the technical field of metal material production and manufacturing, in particular to a continuous casting system and method for silver alloy. A continuous casting system for silver alloy comprises a vacuum induction device, an electrode bar, a pulse power source, a crystallization cooling device and a supporting device. The vacuum induction device is used for carrying out vacuum induction treatment on a silver alloy raw material so as to form a hot melt; one end of the electrode bar is in contact with the hot melt, and the other end of the electrode bar is connected with the positive electrode of the pulse power supply; the crystallization cooling device is used for carrying out crystallization treatment on the hot melt to form a cast rod; the supporting device is used for supporting the casting rod, and the casting rod is connected with the negative electrode of the pulse power source through the supporting device. According to the continuous casting system, through cooperation of all the devices, growth of columnar crystals can be controlled, the quality and performance of bonding wires and castings are improved, the production cost is reduced, and meanwhile the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material production and manufacturing, and in particular to a continuous casting system and method for a silver alloy. Background Art

[0002] As an efficient metal casting process, continuous casting is widely used in the production of steel, nonferrous metals and other materials. Compared with traditional casting methods, continuous casting has the advantages of high production efficiency, high raw material utilization and environmental friendliness. As an important production process in the preparation of bonding wires, continuous casting directly affects the mechanical properties and reliability of the material. The axially grown columnar crystals in the cast rod can greatly improve the drawing performance of the material.

[0003] During the continuous casting process, the growth of columnar crystals will change due to factors such as temperature field, composition, and flow conditions. Columnar crystals usually grow preferentially along a specific direction to form the desired microstructure. However, uncontrolled columnar crystal growth may lead to crystal defects, uneven performance, processing difficulties, thermal stress and deformation, which may cause wire breakage in subsequent processing and unstable product quality.

[0004] Therefore, in order to ensure the performance and quality of the bonding wire and the entire cast rod, it is crucial to control the growth of columnar crystals. At present, there are many methods to try to control the growth of columnar crystals, such as adjusting the cooling rate, changing the alloy composition and adding oxides. However, the existing technology still has problems such as unsatisfactory growth of columnar crystals, uneven performance, processing difficulty, thermal stress and deformation, and its feasibility and practical application need to be improved.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] One object of the present invention is to provide a continuous casting system for silver alloys to solve the problems of unsatisfactory growth of columnar crystals, uneven performance, difficult processing, thermal stress and deformation existing in the silver alloy columnar crystal continuous casting system in the prior art.

[0007] An object of the present invention is to provide a continuous casting method for a silver alloy, which can effectively control the growth of columnar crystals and improve the performance of the silver alloy.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] A continuous casting system for silver alloys, comprising a vacuum induction device, an electrode rod, a pulse power supply, a crystallization cooling device and a supporting device; the vacuum induction device is used to perform vacuum induction treatment on silver alloy raw materials to form a hot melt; one end of the electrode rod is in contact with the hot melt, and the other end of the electrode rod is connected to the positive electrode of the pulse power supply; the crystallization cooling device is used to perform crystallization treatment on the hot melt to form a cast rod; the supporting device is used to support the cast rod, and the cast rod is connected to the negative electrode of the pulse power supply through the supporting device.

[0010] In some embodiments, the top cover of the vacuum induction device is provided with a first opening, and the electrode rod is in contact with the hot melt through the first opening.

[0011] In some embodiments, an induction coil is disposed outside the induction furnace of the vacuum induction device.

[0012] In some embodiments, the vacuum sensing device is further provided with a vacuum gauge.

[0013] In some embodiments, the continuous casting system further comprises a vacuum pumping device. The top cover of the vacuum sensing device is provided with a vacuum port, and the vacuum pumping device is connected to the vacuum port.

[0014] In some embodiments, a liquid outlet pipe is disposed at the bottom of the vacuum induction device, the crystallization cooling device is disposed at the bottom of the vacuum induction device, and the liquid outlet pipe is accommodated inside the crystallization cooling device.

[0015] In some embodiments, the crystallization cooling device includes a crystallization device and a cooling device, and the cooling device is disposed outside the crystallization device.

[0016] In some embodiments, the continuous casting system further comprises a guiding device, wherein the guiding device is used to pull the casting rod.

[0017] A continuous casting method for a silver alloy, using the above-mentioned continuous casting system, comprises the following steps:

[0018] The silver alloy raw material is subjected to vacuum induction treatment to obtain a hot melt, and the hot melt is subjected to continuous casting. During the continuous casting process, a pulse power supply is used to energize the cast rod obtained after crystallization cooling.

[0019] In some implementations, the voltage of the pulse power supply is 150-220V, and the frequency is 2-20Hz.

[0020] In some embodiments, the current of the vacuum induction treatment is 15 to 25A;

[0021] In some implementations, the temperature of the hot melt is 1000-1250° C., and the temperature is kept at 1000-1250° C. for 30-60 min.

[0022] In some embodiments, before the continuous casting process, the vacuum condition of the hot melt environment is controlled to be less than 10 -2 Pa.

[0023] In some embodiments, during the continuous casting process, the hot melt is subjected to a crystallization treatment; the temperature of the crystallization treatment is 600-750°C.

[0024] In some embodiments, the crystallization device is cooled at a temperature of 18-20°C.

[0025] In some implementations, the continuous casting process has a casting speed of 4 to 10 mm / min.

[0026] In some embodiments, the cast rod obtained after the crystallization treatment is subjected to a traction treatment.

[0027] In some embodiments, the silver alloy raw material includes silver element and doping elements, and the doping elements include gold, copper and aluminum; the mass content of the gold is 1% to 8%, the mass content of the copper is 0 to 8.8%, and the mass content of the aluminum is 0.01% to 0.5%.

[0028] In some embodiments, the length of the silver alloy columnar crystals is 6 to 14 mm.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The silver alloy continuous casting system of the present invention can improve the quality and performance of bonding wires and castings, reduce production costs, and improve production efficiency through the coordination of various devices.

[0031] (2) The continuous casting method of the silver alloy of the present invention adopts a pulse power supply to energize the casting rod. Due to the skin effect, the surface of the casting rod can be in a micro-heat state, so that the radial temperature gradient of the casting rod is reduced, the growth ability of radial columnar crystals and equiaxed crystals is reduced, and the dominant growth of axial columnar crystals can be achieved, so as to obtain a casting rod with axially grown grains as the main growth. The introduction of current can effectively reduce pores, cracks and other defects in the casting, improve the mechanical properties and service life of the casting, and at the same time can effectively reduce the temperature gradient, so that the overall performance of the casting is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of the continuous casting system of the present invention;

[0034] Figure 2 This is a structural diagram of a cast rod after current is applied in Example 1 of the present invention;

[0035] Figure 3 This is the organizational diagram of the cast rod without power supply in Comparative Example 1 of the present invention.

[0036] Reference numerals:

[0037] 100-vacuum induction device, 1-electrode rod, 2-vacuum gauge, 3-induction coil, 4-cooling device, 5-guide wheel, 6-support device, 7-casting rod, 8-pulse power supply, 9-exhaust port, 10-crystallization device, 11-vacuum extraction device. DETAILED DESCRIPTION

[0038] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0039] According to one aspect of the present invention, the present invention relates to a continuous casting system for silver alloy, comprising a vacuum induction device, an electrode rod, a pulse power supply, a crystallization cooling device and a supporting device; the vacuum induction device is used to perform vacuum induction treatment on the silver alloy raw material to form a hot melt; one end of the electrode rod is in contact with the hot melt, and the other end of the electrode rod is connected to the positive electrode of the pulse power supply; the crystallization cooling device is used to perform crystallization treatment on the hot melt to form a cast rod; the supporting device is used to support the cast rod, and the cast rod is connected to the negative electrode of the pulse power supply through the supporting device.

[0040] In the continuous casting system of the present invention, a pulse power supply is used to energize the casting rod. Due to the skin effect, the surface of the casting rod can be in a micro-heat state, which reduces the radial temperature gradient of the casting rod, reduces the growth capacity of radial columnar crystals and equiaxed crystals, and achieves the dominant growth of axial columnar crystals; it can effectively reduce pores, cracks and other defects in the casting, improve the mechanical properties and service life of the casting, and effectively reduce the temperature gradient, making the overall performance of the casting more uniform. Through the coordination of various devices, the quality and performance of the bonding wire and the casting can be improved, the production cost can be reduced, and the production efficiency can be improved.

[0041] In some embodiments, the top cover of the vacuum induction device is provided with a first opening, and the electrode rod contacts the hot melt through the first opening. The electrode rod is vertically inserted into the interior of the vacuum induction device through the first opening, and the lower part of the electrode rod is immersed in the hot melt.

[0042] In some embodiments, an induction coil is disposed outside the induction furnace of the vacuum induction device.

[0043] In some embodiments, the continuous casting system further comprises a vacuum pumping device. In some embodiments, the top cover of the vacuum sensing device is provided with a vacuum port, and the vacuum pumping device is connected to the vacuum port. The vacuum condition inside the vacuum sensing device is controlled by the vacuum pumping device. In some embodiments, the vacuum sensing device is further provided with a vacuum gauge to obtain vacuum data.

[0044] In some embodiments, a liquid outlet pipe is provided at the bottom of the vacuum induction device, and a crystallization cooling device is provided at the bottom of the vacuum induction device, and the liquid outlet pipe is accommodated inside the crystallization cooling device. In some embodiments, the crystallization cooling device includes a crystallization device and a cooling device, and the cooling device is provided outside the crystallization device. The crystallization device is a graphite crystallizer; and the cooling device is a water-cooled copper sleeve. The hot melt is crystallized by the crystallization cooling device, so as to facilitate the subsequent continuous casting effect.

[0045] In some embodiments, the continuous casting system further comprises a guide device, which is located at the bottom of the crystallization cooling device and is used to pull the casting rod. In some embodiments, the guide device comprises a guide wheel. The guide wheel pulls the guide rod (the guide rod is connected to the casting at the beginning of the casting so that the guide wheel can pull the casting rod) or the casting rod for continuous casting.

[0046] According to another aspect of the present invention, the present invention relates to a continuous casting method of a silver alloy, comprising the following steps:

[0047] The silver alloy raw material is subjected to vacuum induction treatment to obtain a hot melt, and the hot melt is subjected to continuous casting. During the continuous casting process, a pulse power supply is used to energize the cast rod obtained after crystallization cooling.

[0048] Continuous casting is an important production process in the preparation of bonding wires. The quality of the cast rod is crucial to the production efficiency and service reliability of the bonding wire preparation. The axial growth of columnar crystals in the cast rod can greatly improve the drawing performance of the material. In view of the problem of uncontrollable growth of columnar crystals during the continuous casting process, the present invention proposes a continuous casting method for the dominant growth of silver alloy columnar crystals, which can obtain a cast rod with grains mainly growing axially. The present invention uses a pulse power supply to energize the cast rod. Due to the skin effect, the surface of the cast rod can be placed in a micro-heat state, which reduces the radial temperature gradient of the cast rod, reduces the growth ability of radial columnar crystals and equiaxed crystals, and realizes the dominant growth of axial columnar crystals; the introduction of current can effectively reduce pores, cracks and other defects in the casting, improve the mechanical properties and service life of the casting, and at the same time can effectively reduce the temperature gradient, making the overall performance of the casting more uniform.

[0049] In some embodiments, the voltage of the pulse power supply is 150-220V, including but not limited to 150V, 160V, 170V, 180V, 190V, 200V, 210V, 220V, etc., or any range between the two. The frequency is 2-20Hz, including but not limited to 2Hz, 3Hz, 5Hz, 8Hz, 10Hz, 12Hz, 15Hz, 18Hz, 20Hz, etc., or any range between the two. Further preferably, the voltage of the pulse power supply is 150-180V and the frequency is 4-12Hz. The present invention adopts a suitable pulse power supply voltage and frequency, which is more conducive to ensuring the dominant growth of axial columnar crystals, refining grains, and improving the comprehensive performance of silver alloy castings.

[0050] In some embodiments, the pulse current is increased, and the length of the columnar crystal is the largest when the frequency is 2 Hz. If the frequency is further increased, the length of the columnar crystal will decrease. Due to the vibration energy, the grains are refined. Although the length of the columnar crystal is reduced, the proportion of the columnar crystal increases, which can still increase its drawing performance and improve the comprehensive performance of the silver alloy casting.

[0051] In some embodiments, the current of the vacuum induction treatment is 15-25A, including but not limited to 15A, 18A, 20A, 22A, 25A, etc., or any range between the two.

[0052] In some embodiments, the temperature of the hot melt is 1000-1250°C, including but not limited to 1000°C, 1020°C, 1050°C, 1080°C, 1100°C, 1120°C, 1150°C, 1160°C, 1180°C, 1200°C, 1250°C, etc., or any range between two values. Keep warm at 1000-1250°C for 30-60 minutes, and the holding time is, for example, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes or 60 minutes, etc., or any range between two values. Preferably, the temperature of the hot melt is 1150-1200°C, and is kept warm at 1150-1200°C for 30-60 minutes. The present invention adopts a suitable temperature and holding time of the hot melt to facilitate subsequent continuous casting processing, which is conducive to the dominant growth of silver alloy columnar crystals and is conducive to improving the comprehensive performance of the casting.

[0053] In some embodiments, before continuous casting, the vacuum condition of the hot melt environment is controlled to be less than 10 -2 Pa, for example, 0.005Pa, 0.008Pa, 0.009Pa, etc. The vacuum condition of the present invention can be obtained by vacuum treatment, and suitable vacuum condition is beneficial to the subsequent continuous casting process.

[0054] In some embodiments, during the continuous casting process, the hot melt is crystallized; the temperature of the crystallization process is 600-750°C, including but not limited to 600°C, 620°C, 650°C, 680°C, 700°C, 720°C or 750°C, or any range between the two. The crystallization process device is cooled, and the cooling process temperature is 18-20°C, such as 18°C, 18.5°C, 19°C, 19.5°C or 20°C, or any range between the two. The present invention adopts appropriate crystallization temperature and cooling temperature, which is more conducive to ensuring the crystallization effect of the silver alloy and improving the mechanical properties and service life of the silver alloy.

[0055] In some embodiments, the continuous casting process has a casting speed of 4 to 10 mm / min, such as 4 mm / min, 5 mm / min, 6 mm / min, 8 mm / min, 9 mm / min, 10 mm / min, etc., or any range between the two. The present invention adopts a suitable casting speed, which is more conducive to the continuous casting effect of the silver alloy and improves its comprehensive performance.

[0056] In some embodiments, the silver alloy raw material includes silver element and doping elements, and the doping elements include gold, copper and aluminum. The mass content of gold is 1% to 8%, such as 1%, 2%, 3%, 4%, 5%, 6% and 8%, etc. The mass content of copper is 0 to 8.8%, such as 1%, 2%, 3%, 5%, 6%, 8.8%, etc. The mass content of aluminum is 0.01% to 0.5%, such as 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, etc. Gold and silver are infinitely miscible. Adding an appropriate amount of elemental gold can reduce the grain boundary voltage, but too much cost is high; an appropriate amount of aluminum can play a good passivation role to protect silver from oxidation.

[0057] In some embodiments, the length of the silver alloy columnar crystals is 6 to 14 mm, for example, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, etc.

[0058] In a preferred embodiment, a continuous casting method is implemented using a continuous casting system with silver alloy columnar crystals growing preferentially, comprising the following steps:

[0059] (a) Place silver alloy raw materials into an induction furnace of a vacuum induction device, and insert an electrode rod into the induction furnace. The silver alloy raw materials include pure silver and added elements (gold, copper, aluminum). The electrode rod is connected to the positive pole of a pulse power supply. The voltage of the pulse power supply is 150 to 220 V and the frequency is 2 to 20 Hz. Then use a vacuum device to evacuate to 10 -2 Pa, turn on the induction furnace power, adjust the current to 15-25A, heat the silver alloy raw material to 1000-1250℃, and keep it warm for 30-60min.

[0060] (b) Turn on the casting switch, the guide wheel guides the guide rod (the guide rod is connected to the casting at the beginning of casting so that the guide wheel can guide the casting rod) or the casting rod, the casting speed is 4-10mm / min, the casting rod is placed on the support device, and the support device supporting the casting rod is connected to the negative electrode of the pulse power supply. The temperature of the crystallization device is 600-750℃, and the water temperature in the cooling device is 18-20℃.

[0061] (c) When the continuous casting is connected to the supporting device, turn on the pulse power switch to perform continuous casting, and coil the casting rod on the supporting device to cool it. When the casting is completed, turn off the pulse power supply, and then turn off the casting switch to end the continuous casting.

[0062] The following is further explained in conjunction with specific embodiments.

[0063] Example 1

[0064] A continuous casting system for a silver alloy, such as Figure 1As shown, it includes: a vacuum induction device 100, an electrode rod 1, a pulse power supply 8, a vacuum pumping device 11, a crystallization cooling device, a vacuum gauge 2, a guide device 5 and a support device 6; the crystallization cooling device includes a crystallization device 10 and a cooling device 4 located outside. The guide device 5 is a guide wheel. The crystallization device 10 is a graphite crystallizer; and the cooling device 4 is a water-cooled copper sleeve.

[0065] The induction cooker of the vacuum induction device 100 contains silver alloy raw materials inside, which are used to perform vacuum induction treatment on the silver alloy raw materials to form a hot melt liquid; the top cover of the vacuum induction device 100 is provided with a first opening, and the electrode rod 1 is vertically inserted into the first opening, with one end in contact with the hot melt liquid, and the other end of the electrode rod 1 is connected to the positive pole of the pulse power supply 8.

[0066] An induction coil 3 is disposed outside the vacuum induction device 100 . An air suction port 9 and a vacuum gauge 2 are disposed on the top of the vacuum induction device 100 . The air suction port 9 is connected to a vacuum pump 11 .

[0067] A liquid outlet pipe is disposed at the bottom of the vacuum sensing device 100 ; the crystallization device 10 is disposed at the bottom of the vacuum sensing device 100 , and the liquid outlet pipe is accommodated inside the crystallization device 10 .

[0068] The guide device 5 is arranged at the lower part of the cooling device 4 to pull the casting rod 7.

[0069] The supporting device 6 is used to support the casting rod 7 , and the casting rod 7 is connected to the negative electrode of the pulse power supply 8 through the supporting device 6 .

[0070] Example 2

[0071] A continuous casting method for the dominant growth of silver alloy columnar crystals comprises the following steps:

[0072] (1) Pure silver and additive elements (gold, copper, and aluminum) are placed in an induction furnace of a vacuum induction device 100, wherein the mass content of gold is 1%, the mass content of copper is 2%, and the mass content of aluminum is 0.3%. An electrode rod 1 is inserted into the induction furnace, and the electrode rod 1 is connected to the positive electrode of a pulse power supply 8, and the voltage of the pulse power supply 8 is 150V and the frequency is 2Hz. Then, a vacuum device 11 is used to evacuate the vacuum to 0.001Pa, and the power supply of the induction furnace is turned on, and the current is adjusted to 20A. The silver and the additive elements are heated to 1160°C and kept warm for 30 minutes.

[0073] (2) The casting switch is turned on, the guide wheel 5 pulls the casting rod 7, the casting speed is 4 mm / min, the casting rod 7 is placed on the supporting device 6, and the supporting device 6 supporting the casting rod 7 is connected to the negative electrode of the pulse power supply 8. The temperature of the crystallization device 10 is 700°C, and the water temperature in the cooling device 4 is 19°C.

[0074] (3) When the continuous casting is connected to the support device 6, the pulse power supply 8 is turned on to perform continuous casting, and the casting rod 7 is coiled on the support device 6 to cool. When the casting is completed, the pulse power supply 8 is turned off, and then the casting switch is turned off to end the continuous casting.

[0075] Example 3

[0076] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0077] The frequency of the pulse power supply 8 is 4 Hz.

[0078] Example 4

[0079] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0080] The frequency of the pulse power supply 8 is 9 Hz.

[0081] Example 5

[0082] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0083] The silver and additive elements are heated to 1250°C.

[0084] Example 6

[0085] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0086] The silver and the additive elements are heated to 1000°C.

[0087] Example 7

[0088] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0089] The casting speed is 10 mm / min.

[0090] Example 8

[0091] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0092] The temperature of the crystallization device 10 was 600°C.

[0093] Example 9

[0094] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0095] The temperature of the crystallization device 10 was 750°C.

[0096] Example 10

[0097] A continuous casting method for the dominant growth of silver alloy columnar crystals, which differs from Example 2 in that:

[0098] The voltage of the pulse power supply 8 is 200V.

[0099] Comparative Example 1

[0100] A continuous casting method for the dominant growth of silver alloy columnar crystals, except that no pulse power supply is added, other conditions are consistent with Example 2.

[0101] Experimental example

[0102] The length of the silver alloy columnar crystals and the grain size of the equiaxed crystals in each embodiment were tested, and the proportion of the axial columnar crystals was calculated. The results are shown in Table 1.

[0103] Table 1 Test results

[0104]

[0105]

[0106] The silver alloy continuous casting method of the present invention adopts a pulse power supply to energize the casting rod. Due to the skin effect, the surface of the casting rod can be in a micro-heat state, so that the radial temperature gradient of the casting rod is reduced, the growth ability of radial columnar crystals and equiaxed crystals is reduced, and the dominant growth of axial columnar crystals can be achieved, so as to obtain a casting rod in which the grains mainly grow in the axial direction; the introduction of electric current can effectively reduce pores, cracks and other defects in the casting, improve the mechanical properties and service life of the casting, and can effectively reduce the temperature gradient, so that the overall performance of the casting is more uniform.

[0107] The length of the silver alloy columnar crystals in each embodiment of the present invention is appropriate, the size of the equiaxed crystals is appropriate, and the proportion of the axial columnar crystals is appropriate. In addition, the structure diagram of the cast rod after the current is applied in Example 1 of the present invention is as follows: Figure 2 As shown, the structure and performance are excellent. The structure diagram of the cast rod without power supply in Comparative Example 1 of the present invention is as follows Figure 3 As shown, defects occur, namely, cracks and uneven structure.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous casting system for silver alloys, characterized in that: It includes a vacuum induction device, an electrode rod, a pulse power supply, a crystal cooling device and a supporting device; The vacuum induction device is used to perform vacuum induction treatment on the silver alloy raw material to form a hot melt; One end of the electrode rod is in contact with the hot melt, and the other end of the electrode rod is connected to the positive electrode of the pulse power supply; The crystallization cooling device is used to perform crystallization treatment on the hot melt to form a cast rod; The supporting device is used to support the casting rod, and the casting rod is connected to the negative electrode of the pulse power supply through the supporting device.

2. The continuous casting system of silver alloy according to claim 1, characterized in that: The top cover of the vacuum induction device is provided with a first opening, and the electrode rod contacts the hot melt through the first opening; And / or, an induction coil is arranged outside the induction furnace of the vacuum induction device; And / or, the vacuum sensing device is further provided with a vacuum gauge.

3. The continuous casting system of silver alloy according to claim 1, characterized in that: The continuous casting system also includes a vacuum pump; The top cover of the vacuum induction device is provided with an air suction port, and the vacuum extraction device is connected to the air suction port.

4. The continuous casting system of silver alloy according to claim 1, characterized in that: The bottom of the vacuum induction device is provided with a liquid outlet pipe, the crystallization cooling device is provided at the bottom of the vacuum induction device, and the liquid outlet pipe is accommodated inside the crystallization cooling device; The crystallization cooling device comprises a crystallization device and a cooling device, and the cooling device is arranged outside the crystallization device.

5. The continuous casting system of silver alloy according to claim 1, characterized in that: The continuous casting system further comprises a guide device, which is used for pulling the casting rod.

6. A method for continuous casting of a silver alloy, characterized in that: The continuous casting system according to any one of claims 1 to 5 comprises the following steps: The silver alloy raw material is subjected to vacuum induction treatment to obtain a hot melt, and the hot melt is subjected to continuous casting. During the continuous casting process, a pulse power supply is used to energize the cast rod obtained after crystallization cooling.

7. The method for continuous casting of silver alloy columns according to claim 6, characterized in that: The voltage of the pulse power supply is 150-220V, and the frequency is 2-20Hz.

8. The method for continuous casting of silver alloy according to claim 6, characterized in that: The current of the vacuum induction treatment is 15 to 25A; And / or, the temperature of the hot melt is 1000-1250° C., and the temperature is kept at 1000-1250° C. for 30-60 min; And / or, before the continuous casting process, the vacuum condition of the hot melt environment is controlled to be less than 10 -2 Pa.

9. The method for continuous casting of silver alloy according to claim 6, characterized in that: During the continuous casting process, the hot melt is crystallized; The temperature of the crystallization treatment is 600-750°C; The crystallization device is cooled at a temperature of 18 to 20° C. And / or, the continuous casting process has a casting speed of 4 to 10 mm / min; And / or, the cast rod obtained after the crystallization treatment is subjected to a traction treatment.

10. The method for continuous casting of silver alloy according to claim 6, characterized in that: The silver alloy raw material includes silver element and doping elements, the doping elements include gold, copper and aluminum, the mass content of the gold is 1% to 8%, the mass content of the copper is 0 to 8.8%, and the mass content of the aluminum is 0.01% to 0.5%; And / or, the length of the silver alloy columnar crystals is 6 to 14 mm.

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