Continuous preparation device of copper-chromium alloy product, copper-chromium alloy product and continuous preparation method thereof

Abstract

The application discloses a continuous preparation device for copper-chromium alloy products, a copper-chromium alloy product and a continuous preparation method thereof, and belongs to the technical field of alloy materials. The device comprises a smelting unit provided with a smelting inlet and a smelting outlet; a continuous casting and rolling unit provided with a casting and rolling inlet and a casting and rolling outlet, the smelting outlet being connected with the casting and rolling inlet; a continuous annealing unit provided with an annealing inlet and an annealing outlet, the casting and rolling outlet being connected with the annealing inlet; a first cooling unit provided with a first cooling inlet and a first cooling outlet, the annealing outlet being connected with the first cooling inlet; a nondestructive testing unit provided with a testing inlet, a testing outlet and a testing signal outlet, the first cooling outlet being connected with the testing inlet; a stamping control unit provided with a stamping inlet, a control signal inlet, a finished product outlet and a defective product outlet, the testing outlet being connected with the stamping inlet; and the testing signal outlet being connected with the control signal inlet in signal. The continuous device improves production efficiency, shortens a cycle and reduces energy consumption.

Description

Technical Field

[0001] This application relates to the field of metal alloy materials technology, and more specifically, to a continuous preparation apparatus for copper-chromium alloy products, copper-chromium alloy products, and a continuous preparation method thereof. Background Technology

[0002] High-voltage switchgear is a core component of power systems, and its reliability directly affects the safe and stable operation of the entire power grid. Among these components, switch contacts, as key elements for carrying and interrupting current, are of paramount importance. Copper-chromium alloys, combining the high electrical and thermal conductivity of copper with the high hardness, high strength, and excellent resistance to arc erosion and welding provided by chromium, have become an ideal material for manufacturing high-voltage and ultra-high-voltage vacuum switch contacts. Currently, the performance requirements for copper-chromium alloy contacts are extremely stringent, typically requiring a conductivity of 16 MS / m or higher, a Brinell hardness of not less than 80 HB, and excellent wear resistance and resistance to arc erosion.

[0003] The traditional production process of copper-chromium alloy contacts is a segmented, multi-process production mode, which has many shortcomings. For example, (1) high energy consumption: repeated heating, cooling and annealing processes consume a lot of electricity and fuel; (2) long production cycle: material transfer, waiting and on-line operation between processes lead to a long production cycle, which may last for several days; (3) poor product quality consistency: multiple heat treatment and processing processes increase the risk of process parameter fluctuations, which can easily lead to uneven product performance between batches or even within batches; the slow cooling rate during casting can also easily lead to chromium segregation, forming coarse chromium-rich phases, affecting the mechanical and electrical properties of the final product; (4) low yield: in the long process, the oxidation and burning of materials, head and tail removal and defects that may occur in each link (such as cracks, inclusions, etc.) all lead to low material utilization, and the final yield is difficult to guarantee; (5) difficult to automate the production process: each process is independent and the equipment is scattered, making it difficult to form a continuous and automated production flow, and it is impossible to achieve efficient process monitoring and quality traceability. Summary of the Invention

[0004] The main objective of this application is to provide a continuous preparation apparatus for copper-chromium alloy products, copper-chromium alloy products, and a continuous preparation method thereof to solve the problems of high energy consumption, long cycle time, and low production efficiency in the existing copper-chromium alloy production process.

[0005] To achieve the above objectives, according to one aspect of this application, a continuous preparation apparatus for copper-chromium alloy products is provided, comprising:

[0006] The smelting unit is equipped with a smelting inlet and a smelting outlet. The smelting unit is used to smelt copper-chromium alloy raw materials into copper-chromium alloy melt.

[0007] A continuous casting and rolling unit is provided with a casting and rolling inlet and a casting and rolling outlet, and the smelting outlet and the casting and rolling inlet are connected; the continuous casting and rolling unit is used to cast and roll copper-chromium alloy melt to form hot strip billets;

[0008] The continuous annealing unit is equipped with an annealing inlet and an annealing outlet, and the casting outlet and the annealing inlet are connected; the continuous annealing unit is used to anneal hot strip to form annealed strip.

[0009] The first cooling unit is provided with a first cooling inlet and a first cooling outlet, and the annealing outlet is connected to the first cooling inlet; the first cooling unit is used to perform a first cooling on the annealed strip blank to form a first cooled strip blank.

[0010] The non-destructive testing unit is equipped with a detection inlet, a detection outlet, and a flaw detection signal outlet. The first cooling outlet is connected to the detection inlet. The non-destructive testing unit is used to inspect the interior of the first cooling strip blank to determine the location of defects in the first cooling strip blank and send the defect location information to the stamping control unit.

[0011] The stamping control unit is equipped with a stamping inlet, a control signal inlet, a finished product outlet, and a defective product outlet. The detection outlet is connected to the stamping inlet; the flaw detection signal outlet is connected to the control signal inlet. The stamping control unit 6 is used to stamp the first cooled strip blank that has passed through the non-destructive testing unit 5, remove defective products, and sort out copper-chromium alloy products.

[0012] Furthermore, a heat preservation unit is provided between the smelting unit and the continuous casting and rolling unit. The heat preservation unit has a heat preservation inlet and a heat preservation outlet; the smelting outlet and the heat preservation inlet are connected, and the heat preservation outlet and the casting and rolling inlet are connected.

[0013] Furthermore, the smelting outlet and the insulation inlet are connected by a ceramic flow channel.

[0014] Furthermore, the insulation outlet and the casting inlet are connected via a graphite casting nozzle.

[0015] Furthermore, the insulation unit is a graphite insulation intermediate package.

[0016] Furthermore, a second cooling unit is provided between the non-destructive testing unit and the stamping control unit; the second cooling unit is provided with a second cooling inlet and a second cooling outlet, and the testing outlet and the second cooling inlet are connected; the second cooling outlet is connected to the stamping inlet; the second cooling unit is used to perform a second cooling on the first cooling strip blank that has passed through the non-destructive testing unit to form a second cooling strip blank.

[0017] Furthermore, the second cooling unit is a cooling box.

[0018] Furthermore, the detection outlet and the second cooling inlet are connected via a sealing cover.

[0019] Furthermore, the smelting unit is an induction melting furnace.

[0020] Furthermore, the continuous casting and rolling unit is a horizontal twin-roll continuous casting and rolling mill.

[0021] Furthermore, the continuous annealing unit is a tunnel-type continuous annealing chamber.

[0022] Furthermore, the first cooling unit is an air-cooled unit.

[0023] Furthermore, the non-destructive testing unit is an online eddy current non-destructive testing instrument or an ultrasonic phased array flaw detector.

[0024] Furthermore, the stamping control unit is a stamping press.

[0025] Furthermore, the continuous casting and rolling unit includes a twin-roll assembly and a cooling system; the cooling system includes spiral cooling channels and temperature sensors; the twin-roll assembly includes a roll body; inside the roll body, multiple sets of spiral cooling channels are sequentially arranged along the axial direction of the roll body.

[0026] Furthermore, the inlet of the spiral cooling water channel is located at the first shaft end of the roll body and is connected to an external cooling water device; the outlet of the spiral cooling water channel is located at the second shaft end of the roll body and is also connected to an external cooling water device; a temperature sensor is located at the second shaft end and is used to detect the cooling water temperature at the outlet of the spiral cooling water channel; each set of spiral cooling water channels operates independently in a closed loop; wherein, the cooling water flow direction in the spiral cooling water channel is opposite to the rotation direction of the roll body.

[0027] According to a second aspect of this application, a continuous preparation method for copper-chromium alloy articles is provided, comprising the following steps:

[0028] Step S1: Obtain raw materials according to the proportion of each element in the copper-chromium alloy, and melt each raw material in smelting unit 1 to obtain copper-chromium alloy melt;

[0029] Step S2: The copper-chromium alloy melt is continuously cast and rolled in a continuous casting and rolling unit to obtain a hot strip billet;

[0030] Step S3: The hot strip is continuously annealed in a continuous annealing unit to obtain an annealed strip.

[0031] Step S4: The annealed strip blank is subjected to first cooling in the first cooling unit to obtain the first cooled strip blank;

[0032] Step S5: Perform non-destructive testing on the first cooling strip blank in the non-destructive testing unit to obtain the tested cooling strip blank;

[0033] Step S6: The flaw detection and cooling strip blank is stamped in the stamping control unit to obtain a copper-chromium alloy product;

[0034] The continuous preparation method for copper-chromium alloy products utilizes the aforementioned continuous preparation device for copper-chromium alloy products.

[0035] Furthermore, between steps S1 and S2, there is also step S1-2: the copper-chromium alloy melt is kept at an intermediate temperature in a heat preservation unit to obtain a heat preservation melt; the heat preservation melt is continuously cast and rolled.

[0036] Furthermore, between steps S5 and S6, there are also steps S5-6: the flaw detection cooling strip blank is subjected to a second cooling in the second cooling unit to obtain a second cooling strip blank; the second cooling strip blank is stamped and formed.

[0037] Further, in steps S1-2, the copper-chromium alloy melt is subjected to intermediate heat preservation in a graphite heat preservation tundish to obtain a heat preservation melt.

[0038] Furthermore, in steps S5-6, the second cooling is performed using airflow or atomized water mist; wherein the airflow pressure is 0.4~0.8MPa.

[0039] Furthermore, the second cooling time is 0.5~2.0 min.

[0040] Furthermore, the temperature of the second cooling zone blank is 30~50℃.

[0041] Furthermore, the flaw-detected cooling strip blank undergoes a second cooling process in a cooling box to obtain a second cooled strip blank.

[0042] Furthermore, in step S1, the elemental composition of the copper-chromium alloy includes: Cr 20~50%, doping elements 0.01~0.05%, doping elements include Zr and / or Mg, and the balance is Cu, totaling 100%.

[0043] Furthermore, the smelting temperature is 1700~1950℃.

[0044] Furthermore, the smelting is carried out in an inert atmosphere.

[0045] Furthermore, the raw materials are smelted in an induction melting furnace to obtain a copper-chromium alloy melt.

[0046] Furthermore, in step S2, the casting temperature of the copper-chromium alloy melt is 1700~1900℃.

[0047] Furthermore, the cooling water temperature for continuous casting and rolling is 20~35℃, the cooling water pressure is 0.3~1.0MPa, and the cooling rate is 100~500℃ / s.

[0048] Furthermore, the rolling force of continuous casting and rolling is 50~300t.

[0049] Furthermore, the continuous casting speed is 5~15m / min.

[0050] Furthermore, the thickness of the hot strip blank is 1.5~3.0mm and the width is 200~400mm.

[0051] Furthermore, the copper-chromium alloy melt is continuously cast and rolled in a horizontal twin-roll continuous casting mill to obtain a hot strip billet.

[0052] Furthermore, in step S3, the continuous annealing temperature is 450~550℃, and the continuous annealing holding time is 1.0~2.5min.

[0053] Furthermore, the atmosphere for continuous annealing is nitrogen.

[0054] Furthermore, continuous annealing includes a preheating stage, a soaking stage, and a slow cooling stage; the temperature of the preheating stage is 300~400℃. The temperature of the soaking stage is 450~550℃, and the cooling rate of the slow cooling stage is 50~100℃ / min.

[0055] Furthermore, the annealing temperature of the strip is 150~200℃.

[0056] Furthermore, the hot strip is continuously annealed in a tunnel-type continuous annealing chamber to obtain an annealed strip.

[0057] Furthermore, in step S4, the first cooling method is air cooling.

[0058] Furthermore, the temperature of the first cooling zone blank is ≤110℃.

[0059] Furthermore, the annealed strip blank undergoes a first cooling process in an air cooler to obtain a first cooled strip blank.

[0060] Furthermore, in step S5, the resolution of the non-destructive testing is 0.5~2.0mm, and the scanning speed is 5~15m / min.

[0061] Furthermore, the first cooling strip blank undergoes non-destructive testing using an online eddy current non-destructive testing instrument or an ultrasonic phased array flaw detector to obtain a flaw-tested cooling strip blank.

[0062] Furthermore, in step S6, the stamping speed of the stamping forming is 60~100 times / minute, and the stamping pressure is 150~250t.

[0063] Furthermore, the response time for removing defective products during the stamping process is 0.01~0.05s.

[0064] Furthermore, the flaw-detected cooling strip blank is stamped in a stamping press to obtain copper-chromium alloy products.

[0065] According to a third aspect of this application, a copper-chromium alloy article is provided, which is prepared by the above-described continuous preparation method for copper-chromium alloy articles.

[0066] Furthermore, copper-chromium alloy products are copper-chromium alloy switch contacts.

[0067] Compared with the prior art, this application has the following beneficial effects:

[0068] Significantly reduced energy consumption: This continuous production process integrates casting, hot rolling, annealing, and stamping, eliminating high-energy-consuming steps such as repeated heating of ingots and multiple intermediate annealing processes in traditional processes; the strip is directly fed into the annealing box hot, making great use of the residual heat from casting and rolling. Overall, it is estimated that this process can reduce total energy consumption by 30% to 50% compared to traditional processes.

[0069] The production process is greatly shortened: Through continuous and integrated production mode, the material transfer, storage and waiting time between processes are eliminated, and the production cycle that originally took several days to complete is shortened to within a few hours; compared with the traditional mode, the production cycle can be shortened by more than 30% or even more, and the new product introduction cycle can be compressed by 60%.

[0070] Superior and highly controllable product quality: The extremely high cooling rate during the casting and rolling process effectively suppresses chromium segregation, resulting in an extremely fine and uniform microstructure, fundamentally improving the consistency of material performance; the linkage between online non-destructive testing and the automatic stamping rejection system enables 100% inspection and online removal of internal defects, ensuring "zero defects" for products leaving the factory and reducing the product defect rate from a few percent that might occur with traditional processes to a few ten-thousandths.

[0071] Production efficiency and material utilization are greatly improved: continuous automated production lines reduce manual intervention and can increase production cycle by 40-60%; one-time forming to target thickness reduces head and tail cutting losses and surface oxidation losses in traditional multi-pass rolling, significantly improving the yield of materials. Attached Figure Description

[0072] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0073] Figure 1 This is a schematic diagram of the continuous copper-chromium alloy preparation apparatus provided in Embodiment 1 of this application;

[0074] Figure 2 This is a schematic diagram of the continuous copper-chromium alloy preparation apparatus provided in Embodiment 2 of this application;

[0075] Figure 3This is a schematic diagram of the cross-section of the spiral cooling water channel inside the roll body in the continuous casting and rolling unit provided in Embodiment 1 of this application;

[0076] Figure 4 This is a schematic diagram of the continuous copper-chromium alloy preparation apparatus provided in Embodiment 3 of this application;

[0077] Figure 5 This is a flowchart of the continuous preparation process of copper-chromium alloy provided in Example 4 of this application.

[0078] Figure label:

[0079] 1. Melting unit; 2. Continuous casting and rolling unit; 21. Twin roll assembly; 211. Roll body; 22. Cooling system; 221. Spiral cooling water channel; 222. Temperature sensor; 23. Conveyor roller table; 3. Continuous annealing unit; 4. First cooling unit; 5. Non-destructive testing unit; 6. Stamping control unit; 7. Heat preservation unit; 8. Second cooling unit. Detailed Implementation

[0080] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the embodiments.

[0081] As mentioned in the background section, the traditional production process of copper-chromium alloy contacts suffers from problems such as high energy consumption, long production cycle, poor product quality consistency, low yield, and difficulty in automating the production process.

[0082] According to one aspect of this application, a continuous preparation apparatus for copper-chromium alloy products is provided, such as... Figure 1 As shown, it includes:

[0083] Melting unit 1 is provided with a melting inlet and a melting outlet. Melting unit 1 is used to melt copper-chromium alloy raw materials into copper-chromium alloy melt.

[0084] The continuous casting and rolling unit 2 is provided with a casting and rolling inlet and a casting and rolling outlet, and the smelting outlet and the casting and rolling inlet are connected; the continuous casting and rolling unit 2 is used to cast and roll copper-chromium alloy melt to form hot strip billets;

[0085] The continuous annealing unit 3 is provided with an annealing inlet and an annealing outlet, and the casting outlet and the annealing inlet are connected; the continuous annealing unit 3 is used to anneal the hot strip to form an annealed strip.

[0086] The first cooling unit 4 is provided with a first cooling inlet and a first cooling outlet, and the annealing outlet is connected to the first cooling inlet; the first cooling unit 4 is used to perform a first cooling on the annealed strip blank to form a first cooled strip blank.

[0087] The non-destructive testing unit 5 is provided with a detection inlet, a detection outlet and a flaw detection signal outlet, and the first cooling outlet is connected to the detection inlet; the non-destructive testing unit 5 is used to inspect the interior of the first cooling strip blank to determine the location of defects in the first cooling strip blank, and send the defect location information to the stamping control unit 6.

[0088] The stamping control unit 6 is equipped with a stamping inlet, a control signal inlet, a finished product outlet, and a defective product outlet. The detection outlet is connected to the stamping inlet; the flaw detection signal outlet is connected to the control signal inlet. The stamping control unit 6 is used to stamp the first cooled strip blank that has passed through the non-destructive testing unit 5, remove defective products, and sort out copper-chromium alloy products.

[0089] The integrated continuous production device provided in this application organically integrates a smelting furnace, a heat-insulating tundish, a horizontal continuous casting and rolling mill, a tunnel-type continuous annealing box, an online non-destructive testing instrument, a forced cooling box, and a high-speed precision stamping press linked to the testing instrument into a continuous automated production line via a horizontal conveying device. This continuous, integrated production mode eliminates material transfer, storage, and waiting time between processes, shortening the production cycle from several days to less than a few hours. Compared to traditional methods, the production cycle can be shortened by more than 30%, and the new product introduction cycle can be reduced by 60%. The linkage between online non-destructive testing and the automatic stamping rejection system enables 100% inspection and online removal of internal defects, ensuring "zero defects" for outgoing products and reducing the product defect rate from a few percent in traditional processes to a few ten-thousandths. This continuous automated production line reduces manual intervention and increases production speed by 40-60%.

[0090] In some specific embodiments, the melting unit 1 is a high-frequency induction melting furnace (e.g., model ZG-200); the continuous casting and rolling unit 2 is a horizontal twin-roll continuous casting and rolling mill (e.g., model Φ500×1700), with the casting and rolling outlet and annealing inlet connected by a transfer roller conveyor 23 (e.g., a roller conveyor made of SS-300 heat-resistant steel); the continuous annealing unit 3 is a tunnel-type continuous annealing box; the first cooling unit 4 is an air cooler; the annealing outlet and the first cooling inlet are connected by a transfer roller conveyor 23; the non-destructive testing unit 5 is an online eddy current non-destructive testing instrument or an ultrasonic phased array flaw detector; the first cooling outlet and the testing inlet are connected by a transfer roller conveyor 23; and the stamping control unit 6 is a high-speed precision stamping press.

[0091] In some specific implementations, such as Figure 2As shown, a heat preservation unit 7 is also provided between the melting unit 1 and the continuous casting and rolling unit 2, such as a graphite heat preservation tundish (model SM-ZB-300). The heat preservation unit 7 has a heat preservation inlet and a heat preservation outlet; the melting outlet and the heat preservation inlet are connected, and the heat preservation outlet and the casting and rolling inlet are connected. Specifically, the bottom discharge port of the high-frequency induction melting furnace (ZG-200) is sealed to the top feed port of the graphite heat preservation tundish (SM-ZB-300) through a high-temperature resistant ceramic trough (100mm inner diameter, 1.5m length). The outer wall of the trough is wrapped with heat preservation cotton to prevent the melt from cooling down. The bottom outlet of the heat-insulating tundish is precisely connected to the leading edge of the feed end of the horizontal twin-roll continuous casting mill (Φ500x1700) via a graphite flat casting nozzle (300mm wide, adjustable outlet thickness). The distance between the casting nozzle and the inlet of the casting mill is controlled at 5~8mm. The outlet of the casting mill is connected to the inlet flange of the tunnel-type continuous annealing box (TD-15) via a horizontal heat-resistant steel roller conveyor. The surface of the roller conveyor is coated with a high-temperature resistant coating, and the conveying height is flush with the inlet of the annealing box. The outlet of the annealing box is connected to the detection inlet of the online eddy current non-destructive testing instrument (SWT-630) via a short-distance transition roller conveyor, ensuring that the strip billet passes through the detection area continuously without jamming.

[0092] In some specific implementations, such as Figure 3 As shown, the continuous casting and rolling unit 2 includes a twin-roll assembly 21 and a cooling system 22; the cooling system 22 includes a spiral cooling water channel 221 and a temperature sensor 222; the twin-roll assembly 21 includes a roll body 211; inside the roll body 211, multiple sets of spiral cooling water channels 221 are provided along the axial direction of the roll body 211, for example, 2 to 5 sets. Specifically, a temperature sensor 222 is located at the shaft end of the roll body 211 to measure the outlet water temperature. The temperature sensor 222 is used to detect the temperature of the strip after it has passed through the twin-roll assembly 21. More specifically, the inlet of the spiral cooling water channel 221 is located at the first shaft end of the roll body 211 and is connected to an external cooling water device. The outlet of the spiral cooling water channel 221 is located at the second shaft end of the roll body 211 and is connected to an external cooling water device. The first shaft end and the second shaft end are the two ends of the roll body 211 along the axial direction, used for water inlet and outlet. The temperature sensor 222 is located at the second shaft end and is used to detect the cooling water temperature at the outlet of the spiral cooling water channel 221. Each set of spiral cooling water channels 221 operates independently in a closed loop. The cooling water flow direction in the spiral cooling water channel 221 is opposite to the rotation direction of the roll body 211, which is more conducive to the cooling effect.

[0093] More specifically, the internal structure of the horizontal twin-roll continuous casting and rolling mill (Φ500×1700) includes a twin-roll assembly and a cooling control system:

[0094] Roll body 211: diameter 500mm, length 600mm, material is H13 heat-resistant tool steel, surface is nitrided, hardness ≥60HRC;

[0095] Cooling system 22: Three sets of spiral cooling water channels are set inside the roll along the axial direction. Each set of channels is an independent closed loop with an inner diameter of 10mm and a pitch of 50mm. The water inlet is located at the end of the roll shaft (connected to the cooling water main pipe through a rotary joint), and the water outlet is symmetrically distributed at the other opposite end of the roll shaft. The cooling water flows in the opposite direction to the roll rotation direction to ensure uniform roll surface temperature.

[0096] Control components: Two sets of infrared temperature sensors (detection accuracy ±1℃) are installed on the roll exit side, forming a closed-loop feedback with the cooling water control system; the cooling water flow rate (0.5~2.0m³) is adjusted accordingly. 3 The system dynamically adjusts the cooling rate from 100 to 500℃ / s by controlling the pressure (0.3~1.0MPa) and water temperature (20~35℃).

[0097] Forming mechanism: The roll gap adjustment accuracy is ±0.01mm, and it is equipped with a hydraulic rolling force control system (rolling force adjustable from 50 to 300t) to achieve simultaneous completion of melt solidification and hot rolling deformation, forming to the target strip thickness in one step.

[0098] In some specific embodiments, the continuous annealing unit 3 is a tunnel-type continuous annealing chamber (e.g., model TD-15); the first cooling unit 4 is an air cooler (power of 500~1000W); the non-destructive testing unit 5 is an online eddy current non-destructive testing instrument (e.g., model SWT-630) or an ultrasonic phased array flaw detector; the stamping control unit 6 is a stamping machine, used to automatically skip the blanks marked with defects without stamping, reducing the probability of defective products entering the finished product.

[0099] In some specific implementations, such as Figure 4 As shown, a second cooling unit 8 is provided between the non-destructive testing unit 5 and the stamping control unit 6; the second cooling unit 8 has a second cooling inlet and a second cooling outlet, the testing outlet and the second cooling inlet are connected; the second cooling outlet and the stamping inlet are connected; the second cooling unit 8 is used to perform a second cooling on the first cooled strip blank that has passed through the non-destructive testing unit 5 to form a second cooled strip blank. The second cooling unit 8 is a cooling box; the testing outlet and the second cooling inlet are connected by a sealing cover; the second cooling outlet and the stamping inlet are connected by a conveyor roller 23.

[0100] Specifically, the outlet of the flaw detector is connected to the inlet of the forced cooling box (e.g., model LQ75100) via a sealed cover to prevent airflow leakage during cooling from affecting the uniformity of the strip temperature. The outlet of the cooling box is aligned with the feed end of the high-speed precision stamping press (e.g., model APS-300) via a synchronous conveying mechanism (e.g., conveyor roller 23). The conveying mechanism (e.g., conveyor roller 23) and the stamping rhythm of the stamping press achieve closed-loop synchronization. Based on the flaw detection data, the central control system of the stamping press accurately calculates when the defective strip section arrives at the stamping station. When the strip section marked by the flaw detection system with internal defects enters the stamping die, the stamping control system issues a command to automatically remove the defective contact parts generated by this stamping from the defective product port to the scrap bin via a fast-response rejection mechanism (e.g., a pneumatic swing arm or sorting channel). The qualified parts are stamped normally and enter the finished product collection box through the finished product port. This design ensures that all contact products collected are 100% internally qualified parts, achieving full quality control at the source.

[0101] According to a second aspect of this application, a continuous preparation method for copper-chromium alloy articles is provided, comprising the following steps:

[0102] Step S1: Obtain raw materials according to the proportion of each element in the copper-chromium alloy, and melt each raw material in smelting unit 1 to obtain copper-chromium alloy melt;

[0103] Step S2: The copper-chromium alloy melt is continuously cast and rolled in continuous casting and rolling unit 2 to obtain a hot strip billet;

[0104] Step S3: The hot strip blank is continuously annealed in the continuous annealing unit 3 to obtain the annealed strip blank;

[0105] Step S4: The annealed strip blank is subjected to first cooling in the first cooling unit 4 to obtain the first cooled strip blank;

[0106] Step S5: Perform non-destructive testing on the first cooling strip blank in the non-destructive testing unit 5 to obtain the tested cooling strip blank;

[0107] Step S6: The flaw detection cooling strip blank is stamped and formed in the stamping control unit 6 to obtain a copper-chromium alloy product;

[0108] The continuous preparation method for copper-chromium alloy products uses the aforementioned continuous preparation apparatus.

[0109] The continuous production process of this application integrates casting, hot rolling, annealing, and stamping, eliminating high-energy-consuming steps such as repeated heating of ingots and multiple intermediate annealing in traditional processes. The strip is directly fed into the annealing box hot, making great use of the residual heat from casting and rolling. It is estimated that this process can reduce total energy consumption by 30% to 50% compared with traditional processes. Through continuous and integrated production, the material transfer, storage, and waiting time between processes are eliminated, shortening the production cycle that originally took several days to less than a few hours. Compared with the traditional mode, the production cycle can be shortened by more than 30%, and the new product introduction cycle can be reduced by 60%. The extremely high cooling rate of the casting and rolling process effectively suppresses the segregation of chromium, resulting in an extremely fine and uniform microstructure, fundamentally improving the material's performance consistency. The material is formed to the target thickness in one step, reducing the head and tail cutting losses and surface oxidation losses in traditional multi-pass rolling, and significantly improving the material yield. The linkage between online non-destructive testing and the automatic stamping rejection system enables 100% inspection and online removal of internal defects in products, ensuring "zero defects" for outgoing products and reducing the product defect rate from a few percent that might occur with traditional processes to a few ten-thousandths. This continuous automated production line reduces human intervention and can increase production speed by 40-60%.

[0110] In some specific embodiments, step S1-2 is further included between steps S1 and S2: the copper-chromium alloy melt is held at an intermediate temperature in the holding unit 7 to obtain a holding melt, which is then continuously cast and rolled; the intermediate holding time can be set according to actual production needs; for example, the copper-chromium alloy melt is continuously held at an intermediate temperature in a graphite holding tundish during the operation of the equipment to obtain a holding melt. The above intermediate holding can prevent the melt from cooling down during the production process.

[0111] In some specific embodiments, in step S1, the copper-chromium alloy includes: Cr 20~50%, for example, any value or a range between 20%, 25%, 30%, 35%, 40%, 45%, 50%; controlling the Cr content within this range can balance the high conductivity and high strength of the copper-chromium alloy; doping elements 0.01~0.05%, for example, any value or a range between 0.01%, 0.02%, 0.03%, 0.04%, 0.05%; the doping elements include Zr and / or Mg, with the balance being Cu, totaling 100%; by adding the above-mentioned trace elements, the grain size of the copper-chromium alloy can be refined and its performance improved.

[0112] In some specific embodiments, the melting temperature is 1700~1950℃; for example, 1750~1900℃, or even 1800℃; the melting is carried out in an inert atmosphere; for example, the melting is carried out in an induction melting furnace, thereby obtaining a copper-chromium alloy melt. At the above melting temperature, chromium and other additive elements can be fully dissolved in the copper matrix to form a homogeneous melt, and microstructure optimization and grain refinement can be promoted, while ensuring that the melt has suitable fluidity for subsequent processes; at the same time, thorough refining and degassing are required to ensure the purity of the melt.

[0113] In some specific embodiments, in step S2, the casting temperature of the copper-chromium alloy melt is 1700~1900℃, for example 1750~1850℃, or even 1800℃. The cooling water temperature for continuous casting and rolling is 20~35℃, for example 25~30℃, or even 28℃; the cooling water pressure is 0.3~1.0MPa, for example 0.6~0.9MPa, or even 0.8MPa. The cooling rate is 100~500℃ / s, for example 200~400℃ / s, or even 300℃ / s. Under the above cooling process conditions, the macroscopic segregation of chromium during solidification can be greatly suppressed, forming a supersaturated solid solution or ultrafine dispersed precipitates, which is beneficial for obtaining a uniform microstructure and excellent comprehensive properties in the subsequent process.

[0114] In some specific embodiments, the rolling force of continuous casting and rolling is 50~300t, for example 100~250t, or even 180t. The casting speed of continuous casting and rolling is 5~15m / min, for example 7~10m / min, or even 8m / min. The thickness of the hot strip is 1.5~3.0mm, for example 2.0~2.8mm, or even 2.5mm; the width is 200~400mm, for example 250~350mm, or even 300mm. For example, this continuous casting and rolling is carried out in a horizontal twin-roll continuous casting and rolling mill to obtain the hot strip. By precisely controlling the rolling force, rolling speed and roll gap, the melt completes hot rolling deformation while solidifying, directly producing a strip thickness that meets the requirements of subsequent stamping processes, eliminating the multiple repeated rolling processes in traditional processes, thereby improving production efficiency and shortening the production cycle.

[0115] In some specific embodiments, in step S3, the continuous annealing temperature is 450~550℃, for example 500~530℃, or even 520℃; the continuous annealing holding time is 1.0~2.5min, for example 1.2~1.5min, or even 1.5min; the continuous annealing atmosphere is nitrogen, and the nitrogen purity is 99.95~99.99%, for example 99.98~99.99%, or even 99.99%. Continuous annealing includes a preheating stage, a homogenization stage, and a slow cooling stage. The temperature in the preheating stage is 300~400℃, for example 350~380℃, or even 360℃. The temperature in the homogenization stage is 450~550℃, for example 500~530℃, or even 520℃. The cooling rate in the slow cooling stage is 50~100℃ / min, for example 60~80℃ / min, or even 70℃ / min. The temperature of the annealed strip after annealing is 150~200℃. For example, the hot strip is continuously annealed in a tunnel-type continuous annealing chamber to obtain the annealed strip. The above annealing holding time can be precisely controlled by adjusting the production line speed (e.g., 5~15 m / min). Under the above annealing process conditions, the internal stress generated during casting and rolling can be eliminated, and the supersaturated chromium element can be uniformly dispersed and precipitated in the form of nano-sized particles, achieving age strengthening, thereby obtaining a copper-chromium alloy with the best match between hardness and conductivity.

[0116] In some specific embodiments, in step S4, the first cooling is air cooling; for example, an air-cooled box is used for cooling; the temperature of the first cooled strip blank is ≤110℃. Through the above air cooling process, the strip blank can be initially cooled to a suitable temperature for subsequent non-destructive testing.

[0117] In some specific embodiments, in step S5, the resolution of the non-destructive testing is 0.5~2.0 mm, for example 0.8~1.2 mm, or even 1.0 mm; the scanning speed of the non-destructive testing is 5~15 m / min, for example 7~10 m / min, or even 8 m / min. For example, the first cooled strip blank is subjected to non-destructive testing using an online eddy current non-destructive testing instrument or an ultrasonic phased array non-destructive testing instrument to obtain the tested cooled strip blank. Under the above resolution and scanning speed conditions, it is possible to detect 100% in real time whether there are minute defects such as cracks, pores, and inclusions inside the strip blank, and accurately record the location information of the defects and transmit it to the subsequent stamping control system.

[0118] In some specific implementations, such as Figure 5As shown, steps S5-6 are included between steps S5 and S6: the flaw detection cooling strip blank undergoes a second cooling in the second cooling unit 8 to obtain a second cooled strip blank; the second cooled strip blank is then stamped; for example, the flaw detection cooling strip blank undergoes a second cooling in a cooling box to obtain the second cooled strip blank; wherein, the airflow pressure is 0.4~0.8MPa, for example 0.5~0.7MPa, or even 0.6MPa; the second cooling time is 0.5~2.0min, for example 0.8~1.2min, or even 1.0min; the temperature of the second cooled strip blank is 30~50℃, for example 35~45℃, or even 40℃. Using the above cooling conditions, the strip blank at approximately 100℃ can be rapidly cooled to near room temperature, facilitating subsequent stamping processes, shortening the production cycle, and improving production efficiency.

[0119] In some specific embodiments, in step S6, the stamping speed is 60-100 times / minute, for example 70-90 times / minute, or even 80 times / minute; the stamping pressure is 150-250t, for example 180-220t, or even 200t. For example, the flaw-detecting cooled strip blank is stamped in a stamping press to obtain copper-chromium alloy products. Using the above-mentioned stamping speed and pressure, the strip blank can be stamped stably and quickly, ensuring the stability of alloy properties, greatly improving production efficiency, shortening the overall production cycle from smelting to finished product, and ensuring the quality of the finished product. During the stamping process, the response time for rejecting defective products is 0.01-0.05s, for example 0.02-0.03s, or even 0.025s. Within this extremely short rejection response time, it is ensured that defective products detected by the online non-destructive testing equipment can be rejected in a timely and accurate manner, ensuring a 100% product qualification rate and improving production efficiency.

[0120] According to a third aspect of this application, a copper-chromium alloy article is provided, which is prepared by the above-described continuous preparation method; the article is specifically a copper-chromium alloy switch contact; for example, a CuCr25 alloy contact adapted to a 72.5kV high-voltage vacuum circuit breaker, a CuCr30 alloy contact adapted to a 126kV high-voltage vacuum circuit breaker, and a CuCr40 alloy contact adapted to a 252kV high-voltage vacuum circuit breaker.

[0121] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0122] The raw materials and equipment used in the embodiments of this application are all existing technologies and are commercially available.

[0123] Example 1

[0124] like Figure 1 As shown, a continuous production apparatus for copper-chromium alloy products includes:

[0125] Melting unit 1 (high frequency induction melting furnace ZG-200) is equipped with a melting inlet and a melting outlet at the bottom. The melting unit is used to melt copper-chromium alloy raw materials into copper-chromium alloy melt.

[0126] The continuous casting and rolling unit 2 (horizontal twin-roll continuous casting and rolling mill Φ500×1700) is equipped with a casting and rolling inlet and a casting and rolling outlet, and the smelting outlet and the casting and rolling inlet are connected by a conveyor roller table 23; the continuous casting and rolling unit is used to cast and roll copper-chromium alloy melt to form hot strip billets.

[0127] Among them, such as Figure 3 As shown, the internal structure of the horizontal twin-roll continuous casting mill includes a twin-roll assembly 21 and a cooling system 22; the roll body 211 has a diameter of 500mm, a length of 600mm, is made of H13 heat-resistant tool steel, and has a nitrided surface with a hardness ≥60HRC; the cooling system 22 has three sets of spiral cooling water channels 221 arranged along the axial direction inside the roll, each set of channels is an independent closed loop, the channel inner diameter is 10mm, the pitch is 50mm, and the water inlet is located at the first shaft end of the roll body 211 (connected to the external cooling water main pipe through a rotary joint). The outlets are symmetrically distributed at the second shaft end (the outlets are connected to the external cooling water main pipe); the cooling water flow direction is opposite to the rotation direction of the roll to ensure uniform roll surface temperature; control components: two sets of infrared temperature sensors 222 (detection accuracy ±1℃) are installed on the outlet side of the roll shaft end, forming a closed-loop feedback with the cooling water control system; to achieve dynamic control of the cooling rate; forming mechanism: the roll gap adjustment accuracy is ±0.01mm, which, together with the hydraulic rolling force control system, enables the simultaneous completion of melt solidification and hot rolling deformation, forming to the target strip thickness in one step;

[0128] The continuous annealing unit 3 (tunnel-type continuous annealing box TD-15) is equipped with an annealing inlet and an annealing outlet. The casting and rolling outlet is connected to the annealing inlet flange through a heat-resistant steel roller conveyor. The roller conveyor surface is coated with a high-temperature resistant coating, and the conveying height is flush with the annealing box inlet. The continuous annealing unit is used to anneal hot strip to form annealed strip.

[0129] The first cooling unit 4 (air cooler) is provided with a first cooling inlet and a first cooling outlet. The annealing outlet is connected to the first cooling inlet via a conveyor roller 23. The first cooling unit 4 is used to perform first cooling on the annealed strip to form a first cooled strip.

[0130] The non-destructive testing unit 5 (online eddy current non-destructive testing instrument SWT-630) is equipped with a detection inlet, a detection outlet and a flaw detection signal outlet. The first cooling outlet is connected to the detection inlet through a short-distance transition roller conveyor to ensure that the strip passes through the detection area continuously without jamming. The non-destructive testing unit is used to inspect the interior of the first cooled strip to determine the location of defects in the first cooled strip and send the defect location information to the stamping control unit 6.

[0131] The stamping control unit 6 (for the high-speed precision stamping machine APS-300) is equipped with a stamping inlet, a control signal inlet, a finished product outlet, and a defective product outlet. The inspection outlet is aligned and connected to the stamping inlet via a synchronous conveyor roller conveyor, and the conveying mechanism achieves closed-loop synchronization with the stamping rhythm of the stamping machine. The flaw detection signal outlet and the control signal inlet are connected. The central control system of the stamping control unit 6 accurately calculates when the defective strip section arrives at the stamping station based on the flaw detection data. When the strip section with internal defects marked by the flaw detection system enters the stamping die, the control system issues a command, and the non-conforming contact parts generated by this stamping are automatically rejected from the defective product outlet to the scrap bin through a fast-response rejection mechanism (pneumatic swing arm or sorting channel). The qualified parts are stamped normally and enter the finished product collection bin through the finished product outlet.

[0132] The specific models and main structures of each equipment unit in the above-mentioned continuous preparation apparatus are shown in Table 1.

[0133] Example 2

[0134] like Figure 2 As shown, a continuous production apparatus for copper-chromium alloy products includes:

[0135] Melting unit 1 (high frequency induction melting furnace ZG-200) is equipped with a melting inlet and a melting outlet at the bottom. The melting unit is used to melt copper-chromium alloy raw materials into copper-chromium alloy melt.

[0136] The insulation unit 7 (graphite insulation intermediate ladle SM-ZB-300) has an insulation inlet at the top and an insulation outlet at the bottom. The melting outlet at the bottom of the high-frequency induction melting furnace is sealed to the insulation inlet of the graphite insulation intermediate ladle through a high-temperature resistant ceramic trough (100mm inner diameter, 1.5m length). The outer wall of the trough is wrapped with insulation cotton to prevent the melt from cooling down.

[0137] Continuous casting and rolling unit 2 (horizontal twin-roll continuous casting and rolling mill Φ500×1700) is equipped with a casting and rolling inlet and a casting and rolling outlet. The insulation outlet of the insulation tundish is precisely connected to the leading edge area of ​​the casting and rolling inlet of the horizontal twin-roll continuous casting and rolling mill through a graphite flat casting nozzle (300mm wide, adjustable outlet thickness). The distance between the casting nozzle and the casting and rolling inlet is controlled at 5~8mm. The continuous casting and rolling unit is used to cast and roll copper-chromium alloy melt to form hot strip billets.

[0138] Among them, such as Figure 3 As shown, the internal structure of the horizontal twin-roll continuous casting mill includes a twin-roll assembly 21 and a cooling system 22; the roll body 211 has a diameter of 500mm, a length of 600mm, is made of H13 heat-resistant tool steel, and has a nitrided surface with a hardness ≥60HRC; the cooling system 22 has three sets of spiral cooling water channels 221 arranged along the axial direction inside the roll, each set of channels is an independent closed loop, the channel inner diameter is 10mm, the pitch is 50mm, and the water inlet is located at the first shaft end of the roll body 211 (connected to the external cooling water main pipe through a rotary joint). The outlets are symmetrically distributed at the second shaft end (the outlets are connected to the external cooling water main pipe); the cooling water flow direction is opposite to the rotation direction of the roll to ensure uniform roll surface temperature; control components: two sets of infrared temperature sensors 222 (detection accuracy ±1℃) are installed on the outlet side of the roll shaft end, forming a closed-loop feedback with the cooling water control system; to achieve dynamic control of the cooling rate; forming mechanism: the roll gap adjustment accuracy is ±0.01mm, which, together with the hydraulic rolling force control system, enables the simultaneous completion of melt solidification and hot rolling deformation, forming to the target strip thickness in one step;

[0139] The continuous annealing unit 3 (tunnel-type continuous annealing box TD-15) is equipped with an annealing inlet and an annealing outlet. The casting and rolling outlet is connected to the annealing inlet flange via a horizontal heat-resistant steel roller conveyor. The roller conveyor surface is coated with a high-temperature resistant coating, and the conveying height is flush with the annealing box inlet. The continuous annealing unit is used to anneal hot strip to form annealed strip.

[0140] The first cooling unit 4 (air cooler) is provided with a first cooling inlet and a first cooling outlet. The annealing outlet is connected to the first cooling inlet via a conveyor roller 23. The first cooling unit 4 is used to perform first cooling on the annealed strip to form a first cooled strip.

[0141] The non-destructive testing unit 5 (online eddy current non-destructive testing instrument SWT-630) is equipped with a detection inlet, a detection outlet and a flaw detection signal outlet. The first cooling outlet is connected to the detection inlet through a short-distance transition roller conveyor to ensure that the strip passes through the detection area continuously without jamming. The non-destructive testing unit is used to inspect the interior of the first cooled strip to determine the location of defects in the first cooled strip and send the defect location information to the stamping control unit 6.

[0142] The stamping control unit 6 (for the high-speed precision stamping machine APS-300) is equipped with a stamping inlet, a control signal inlet, a finished product outlet, and a defective product outlet. The inspection outlet is connected to the stamping inlet end via a synchronous conveyor roller conveyor, and the conveying mechanism achieves closed-loop synchronization with the stamping rhythm of the stamping machine. The flaw detection signal outlet and the control signal inlet are connected. The central control system of the stamping control unit 6 accurately calculates when the defective strip section arrives at the stamping station based on the flaw detection data. When the strip section with internal defects marked by the flaw detection system enters the stamping die, the control system issues a command, and the non-conforming contact parts generated by this stamping are automatically rejected from the defective product outlet to the scrap bin through a fast-response rejection mechanism (pneumatic swing arm or sorting channel). The qualified parts are stamped normally and enter the finished product collection bin through the finished product outlet.

[0143] The specific models and structures of each equipment unit in the above-mentioned continuous preparation apparatus are shown in Table 1.

[0144] Example 3

[0145] like Figure 4 As shown, a continuous production apparatus for copper-chromium alloy products includes:

[0146] Melting unit 1 (high frequency induction melting furnace ZG-200) is equipped with a melting inlet and a melting outlet at the bottom. The melting unit is used to melt copper-chromium alloy raw materials into copper-chromium alloy melt.

[0147] The insulation unit 7 (graphite insulation intermediate ladle SM-ZB-300) has an insulation inlet at the top and an insulation outlet at the bottom. The melting outlet at the bottom of the high-frequency induction melting furnace is sealed to the insulation inlet of the graphite insulation intermediate ladle through a high-temperature resistant ceramic trough (100mm inner diameter, 1.5m length). The outer wall of the trough is wrapped with insulation cotton to prevent the melt from cooling down.

[0148] Continuous casting and rolling unit 2 (horizontal twin-roll continuous casting and rolling mill Φ500×1700) is equipped with a casting and rolling inlet and a casting and rolling outlet. The insulation outlet of the insulation tundish is precisely connected to the leading edge area of ​​the casting and rolling inlet of the horizontal twin-roll continuous casting and rolling mill through a graphite flat casting nozzle (300mm wide, adjustable outlet thickness). The distance between the casting nozzle and the casting and rolling inlet is controlled at 5~8mm. The continuous casting and rolling unit is used to cast and roll copper-chromium alloy melt to form hot strip billets.

[0149] Among them, such as Figure 3As shown, the internal structure of the horizontal twin-roll continuous casting mill includes a twin-roll assembly 21 and a cooling system 22; the roll body 211 has a diameter of 500mm, a length of 600mm, is made of H13 heat-resistant tool steel, and has a nitrided surface with a hardness ≥60HRC; the cooling system 22 has three sets of spiral cooling water channels 221 arranged along the axial direction inside the roll, each set of channels is an independent closed loop, the channel inner diameter is 10mm, the pitch is 50mm, and the water inlet is located at the first shaft end of the roll body 211 (connected to the external cooling water main pipe through a rotary joint). The outlets are symmetrically distributed at the second shaft end (the outlets are connected to the external cooling water main pipe); the cooling water flow direction is opposite to the rotation direction of the roll to ensure uniform roll surface temperature; control components: two sets of infrared temperature sensors 222 (detection accuracy ±1℃) are installed on the outlet side of the roll shaft end, forming a closed-loop feedback with the cooling water control system; to achieve dynamic control of the cooling rate; forming mechanism: the roll gap adjustment accuracy is ±0.01mm, which, together with the hydraulic rolling force control system, enables the simultaneous completion of melt solidification and hot rolling deformation, forming to the target strip thickness in one step;

[0150] The continuous annealing unit 3 (tunnel-type continuous annealing box TD-15) is equipped with an annealing inlet and an annealing outlet. The casting and rolling outlet is connected to the annealing inlet flange via a horizontal heat-resistant steel roller conveyor. The roller conveyor surface is coated with a high-temperature resistant coating, and the conveying height is flush with the annealing box inlet. The continuous annealing unit is used to anneal hot strip to form annealed strip.

[0151] The first cooling unit 4 (air cooler) is provided with a first cooling inlet and a first cooling outlet. The annealing outlet is connected to the first cooling inlet via a conveyor roller 23. The first cooling unit 4 is used to perform first cooling on the annealed strip to form a first cooled strip.

[0152] The non-destructive testing unit 5 (online eddy current non-destructive testing instrument SWT-630) is equipped with a detection inlet, a detection outlet and a flaw detection signal outlet. The first cooling outlet is connected to the detection inlet through a short-distance transition roller conveyor to ensure that the strip passes through the detection area continuously without jamming. The non-destructive testing unit is used to inspect the interior of the first cooled strip to determine the location of defects in the first cooled strip and send the defect location information to the stamping control unit 6.

[0153] The second cooling unit 8 (forced cooling box (LQ75100) is equipped with a second cooling inlet and a second cooling outlet. The detection outlet of the flaw detector and the second cooling inlet are connected by a sealing cover to prevent air leakage during the cooling process from affecting the temperature uniformity of the strip. The second cooling unit 8 is used to perform a second cooling on the first cooled strip that has passed through the non-destructive testing unit 5 to form a second cooled strip.

[0154] The stamping control unit 6 (high-speed precision stamping machine APS-300) is equipped with a stamping inlet, a control signal inlet, a finished product outlet, and a defective product outlet. The second cooling outlet is aligned with the stamping inlet end of the high-speed precision stamping machine via a synchronous conveyor roller conveyor. The conveying mechanism achieves closed-loop synchronization with the stamping rhythm of the stamping machine. The flaw detection signal outlet and the control signal inlet are connected. The central control system of the stamping control unit 6 accurately calculates when the defective strip section arrives at the stamping station based on the flaw detection data. When the strip section with internal defects marked by the flaw detection system enters the stamping die, the control system issues a command to automatically remove the defective contact parts generated by this stamping from the defective product outlet to the scrap bin through a fast-response rejection mechanism (pneumatic swing arm or sorting channel). The qualified parts are stamped normally and enter the finished product collection box through the finished product outlet.

[0155] The specific models and structures of each equipment unit in the above-mentioned continuous preparation apparatus are shown in Table 1.

[0156] Example 4

[0157] like Figure 5 As shown, the continuous fabrication method of CuCr25 high-voltage switch contacts (adapted to 72.5kV high-voltage vacuum circuit breakers) using the apparatus of Example 3 includes the following steps:

[0158] Step S1 Melting: A ZG-200 high-frequency induction melting furnace was used, and 99.99% high-purity cathode copper and 99.9% metallic chromium were charged into it; the chromium content was controlled at 25.0±0.05wt%, 0.02wt% zirconium was added, and the balance was Cu; after vacuuming, 99.99% high-purity argon gas was introduced for protection, the temperature was raised to 1780℃, held for 22min, and then refined and degassed for 12min. After stirring evenly, a copper-chromium alloy melt was obtained, and the composition was found to be qualified by spectral analysis.

[0159] Step S2 Continuous Casting and Rolling: The alloy melt is fed into an SM-ZB-300 type graphite-insulated tundish through a ceramic flow channel. The liquid level is precisely controlled by a liquid level sensor to ensure stable pouring pressure. The melt is injected into a Φ500×1700 type horizontal twin-roll continuous casting and rolling mill at a temperature of 1750℃ through a flat casting nozzle with a width of 300mm. The cooling water pressure is 0.7MPa, the cooling rate is 250℃ / s, the rolling force is 150t, and the casting and rolling speed is 9m / min. A hot copper-chromium alloy strip with a thickness of 2.0mm and a width of 300mm is produced, with an exit temperature of 680℃.

[0160] Step S3 Continuous Annealing: The hot strip blank is directly put into the TD-15 tunnel-type continuous annealing box. The preheating zone temperature is 350℃, the soaking zone temperature is 510℃, the holding time is 1.3min, the cooling rate in the slow cooling zone is 65℃ / min, and the protective atmosphere is 99.99% nitrogen. After continuous annealing, the annealed strip blank is obtained at a temperature of 180℃.

[0161] Step S4 First Cooling: The annealed strip blank is fed into an air cooler and cooled to 95°C to obtain the first cooled strip blank;

[0162] Step S5 Non-destructive testing: The first cooling strip blank is scanned in its entire length using an SWT-630 online eddy current non-destructive testing instrument with a resolution of 1.0 mm and a scanning speed of 7 m / min. The coordinate data of any internal defects with a depth exceeding 0.1 mm detected are sent to the stamping control system in real time.

[0163] Step S6 Second Cooling: The flaw-detected strip blank is sent into an LQ75100 online cooling box, and cooled with 0.5MPa high-pressure airflow + atomized water mist. The temperature drops to 38℃ in 0.9 minutes to obtain the second cooled strip blank.

[0164] Step S7 Stamping (Stamping Control and Rejection): The second cooling strip blank is fed into the APS-300 high-speed precision stamping press with a die clearance of 0.03mm, a stamping speed of 75 times / minute, and a stamping pressure of 180t. The stamping press control system is linked to the rejection mechanism based on the flaw detection data, with a response time of 0.02s. Defective parts are automatically rejected, and qualified products are retained and sent out. Samples are randomly selected from the finished product box for testing, and the results are shown in Table 2.

[0165] Example 5

[0166] like Figure 5 As shown, the continuous fabrication method of CuCr30 high-voltage switch contacts (adapted to 126kV high-voltage vacuum circuit breakers) using the apparatus of Example 3 includes the following steps:

[0167] Step S1 Melting: A ZG-200 high-frequency induction melting furnace was used to charge high-purity cathode copper (99.99%) and metallic chromium (99.9%). After evacuation, high-purity argon gas was introduced for protection. The temperature was raised to 1850℃ to completely melt the mixture, and the mixture was kept at this temperature and stirred for 20 minutes to ensure uniform composition. The mixture was then refined and degassed for 15 minutes to obtain a copper-chromium alloy melt. Spectroscopic analysis confirmed the composition to be: Cr content 30.0±0.05wt%, total impurity elements <0.01%, and the balance being Cu.

[0168] Step S2 Continuous Casting and Rolling: The qualified alloy melt is transferred through a ceramic flow channel into an SM-ZB-300 graphite-insulated tundish. The liquid level is precisely controlled by a liquid level sensor to ensure stable pouring pressure. The melt is continuously injected into a Φ500×1700 type horizontal twin-roll casting mill at a temperature of 1800℃ through a flat casting nozzle with a width of 300mm. The internal cooling water pressure of the rolls is maintained at 0.8MPa, and the flow rate is automatically adjusted according to the feedback of the exit strip temperature, controlling the cooling rate at 300°C / s. The rolling force is 200t. The casting and rolling speed is controlled at 8m / min to continuously produce hot copper-chromium alloy strips with a thickness of 2.5mm±0.05mm and a width of 300mm, with an exit temperature of approximately 700℃.

[0169] Step S3 Continuous Annealing: The hot strip blank is directly and horizontally placed into a 15-meter-long tunnel-type annealing chamber (TD-15), which is filled with nitrogen (99.99%) as a protective atmosphere. The temperature of the preheating zone of the annealing chamber is 350℃, and the temperature of the soaking zone is 520℃. Based on the linear velocity of 8m / min, the effective holding time of the strip blank in the soaking zone is about 1.5min, and the cooling rate in the slow cooling zone is 80℃ / min. After continuous annealing, the annealed strip blank is obtained at a temperature of 165℃.

[0170] Step S4 First Cooling: The annealed strip blank is fed into an air cooler and air-cooled to 100°C to obtain the first cooled strip blank;

[0171] Step S5 Non-destructive testing: The first cooled strip blank is passed through an SWT-630 online eddy current non-destructive testing instrument. The testing equipment scans the entire length and width of the strip blank at a resolution of 1mm and a scanning speed of 8m / min, and sends the coordinate data of any internal defects with a depth exceeding 0.1mm detected to the stamping control system in real time.

[0172] Step S6 Second Cooling: The strip blank after flaw detection is passed through a high-pressure air-cooling box (LQ75100 type) and cooled with 0.7MPa high-pressure airflow + atomized water mist. The temperature is reduced to 40℃ within 1 minute to obtain the second cooled strip blank;

[0173] Step S7 Stamping (Stamping Control and Rejection): The second cooling strip blank is fed into the APS-300 high-speed precision stamping press with a die clearance of 0.04mm, a stamping speed of 80 times / minute, and a stamping pressure of 200t. The stamping press control system is linked to the rejection mechanism based on the flaw detection data, with a response time of 0.025s. Defective parts are automatically rejected, and qualified products are retained and sent out. Samples are randomly selected from the finished product box for testing, and the results are shown in Table 2.

[0174] Example 6

[0175] like Figure 5As shown, the continuous fabrication method of CuCr40 high-voltage switch contacts (adapted to 252kV high-voltage vacuum circuit breakers) using the apparatus of Example 3 includes the following steps:

[0176] Step S1 Melting: A ZG-200 high-frequency induction melting furnace was used, and 99.99% high-purity cathode copper and 99.9% metallic chromium were charged into it. The chromium content was controlled at 40.0±0.05wt%, and 0.04wt% was added, with the balance being Cu. After vacuuming, 99.99% high-purity argon gas was introduced for protection, the temperature was raised to 1850℃, held for 25min, and then refined and degassed for 18min to obtain copper-chromium alloy melt. The composition was found to be qualified by spectral analysis.

[0177] Step S2 Continuous Casting and Rolling: The alloy melt is fed into an SM-ZB-300 type graphite-insulated tundish through a ceramic trough and injected into a Φ500×1700 type horizontal twin-roll continuous casting and rolling mill at a temperature of 1850℃; the cooling water pressure is 0.9MPa, the cooling rate is 350℃ / s, the rolling force is 250t, the casting and rolling speed is 6m / min, and a hot copper-chromium alloy strip with a thickness of 3.0mm and a width of 300mm is produced with an exit temperature of 720℃.

[0178] Step S3 Continuous Annealing: The hot strip blank is directly put into the TD-15 tunnel-type continuous annealing box. The preheating zone temperature is 380℃, the soaking zone temperature is 530℃, the holding temperature is 1.7min, the cooling rate in the slow cooling zone is 75℃ / min, and the protective atmosphere is 99.99% nitrogen. After continuous annealing, the annealed strip blank is obtained at a temperature of 170℃.

[0179] Step S4 First Cooling: The annealed strip blank is fed into an air cooler and air-cooled to 105°C to obtain the first cooled strip blank;

[0180] Step S5 Non-destructive testing: The first cooled strip blank is scanned in its entirety using an SWT-630 flaw detector at a resolution of 1.0 mm and a scanning speed of 10 m / min. The coordinate data of any internal defects with a depth exceeding 0.1 mm detected are sent to the stamping control system in real time.

[0181] Step S6 Second Cooling: The flaw-detected strip blank is sent into an LQ75100 online cooling box, and cooled with 0.7MPa high-pressure airflow + atomized water mist. The temperature drops to 42℃ in 1.1 minutes to obtain the second cooled strip blank.

[0182] Step S7 Stamping (Stamping Control and Rejection): The second cooling strip blank is fed into the APS-300 high-speed precision stamping press with a die clearance of 0.035mm, a stamping speed of 70 times / minute, and a stamping pressure of 220t. The stamping press control system is linked to the rejection mechanism based on the flaw detection data, with a response time of 0.03s. Defective parts are automatically rejected, and qualified products are retained and sent out. Samples are randomly selected from the finished product box for testing, and the results are shown in Table 2.

[0183] Example 7

[0184] The difference between Example 7 and Example 5 is that the internal cooling water pressure of the roll in step S2 is replaced with 0.3 MPa, the cooling rate is 100°C / s, and the outlet temperature of the hot copper-chromium alloy strip is about 800°C; other steps remain unchanged; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0185] Example 8

[0186] The difference between Example 8 and Example 5 is that the internal cooling water pressure of the roll in step S2 is replaced with 1.0 MPa, the cooling rate is 500°C / s, and the outlet temperature of the hot copper-chromium alloy strip is about 600°C; other steps remain unchanged; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0187] Example 9

[0188] The difference between Example 9 and Example 5 is that the rolling force of the roll in step S2 is replaced with 50t, the rolling speed is 15m / min, and the strip thickness is 3.0mm; other steps remain unchanged; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0189] Example 10

[0190] The difference between Example 10 and Example 5 is that the rolling force of the roll in step S2 is replaced with 300t, the rolling speed is 5m / min, and the strip thickness is 3.0mm; the other steps remain the same; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0191] Example 11

[0192] The difference between Example 11 and Example 5 is that the preheating zone temperature in step S3 is replaced with 300℃, the soaking zone temperature is 450℃, the holding time is 2.5min, the cooling rate in the slow cooling zone is 50℃ / min, and after continuous annealing, an annealed strip blank is obtained at a temperature of 155℃; other steps remain unchanged; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0193] Example 12

[0194] The difference between Example 12 and Example 5 is that the preheating zone temperature in step S3 is replaced with 400℃, the soaking zone temperature is 550℃, the holding time is 1.0 min, the cooling rate in the slow cooling zone is 100℃ / min, and after continuous annealing, an annealed strip blank is obtained at 160℃; other steps remain unchanged; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0195] Example 13

[0196] The difference between Example 13 and Example 5 is that the pressure of the second cooling in step S6 is replaced with 0.4 MPa, and the temperature is reduced to 50°C in 2.0 min to obtain the second cooled strip blank; the other steps remain unchanged; the final copper-chromium alloy contact performance test is shown in Table 2.

[0197] Example 14

[0198] The difference between Example 14 and Example 5 is that the pressure of the second cooling in step S6 is replaced with 0.8 MPa, and the temperature is reduced to 40°C in 0.5 min to obtain the second cooled strip blank; the other steps remain unchanged; the final copper-chromium alloy contact performance test is shown in Table 2.

[0199] Example 15

[0200] The difference between Example 15 and Example 5 is that the stamping speed in step S7 is replaced with 60 times / minute and the stamping pressure is 250t; the other steps remain the same; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0201] Example 16

[0202] The difference between Example 16 and Example 5 is that the stamping speed in step S7 is replaced with 100 times / minute and the stamping pressure is 150t; the other steps remain the same; the final copper-chromium alloy contact performance test results are shown in Table 2.

[0203] Example 17

[0204] The difference between Example 17 and Example 5 is that the continuous production apparatus of Example 2 is used, and the second cooling step S6 is not performed;

[0205] Specifically, in step S4, the first cooling process involves air cooling to 45°C to obtain the first cooled strip blank.

[0206] In step S5, the first cooling strip blank undergoes non-destructive testing and is directly stamped into a high-speed precision stamping press to obtain a qualified product; performance testing is shown in Table 2.

[0207] Comparative Example

[0208] Traditional CuCr30 copper-chromium alloy infiltration process steps:

[0209] (1) Raw material preparation

[0210] Chromium powder selection: purity ≥ 99%, particle size 200 mesh;

[0211] Copper material preparation: electrolytic copper plates or copper blocks, purity ≥ 99.9%;

[0212] Additives: Appropriate amount of carbon powder (to improve the strength of the skeleton) or a small amount of copper powder (to induce melting and infiltration);

[0213] (2) Preparation of chromium framework

[0214] (2.1) Mixing and molding

[0215] Ingredients: Weigh chromium powder and additives according to the CuCr30 ratio (containing approximately 30wt% Cr);

[0216] Mixing: Mix evenly in a mixer for 4 hours;

[0217] Compression molding: The mixed powder is loaded into a mold and cold-pressed into a blank of the desired shape under a pressure of 40MPa;

[0218] (2.2) Degreasing and pre-sintering

[0219] Degreasing: Treat at low temperature (400℃) for 1.5 hours to remove lubricant;

[0220] Pre-sintering: Under vacuum or hydrogen protection, heat to 1000℃ and hold for 1.5 hours to form a preliminary framework;

[0221] (2.3) Final sintering

[0222] The pre-fired blanks are placed in a vacuum furnace, where the vacuum level reaches 10. -1 Pa;

[0223] The temperature was raised to 1250℃ and held for 1.5 hours to form a porous chromium framework.

[0224] The furnace was cooled to room temperature to obtain a chromium framework with a porosity of 35%.

[0225] (3) Vacuum melting and infiltration

[0226] (3.1) Furnace loading preparation

[0227] Place the chromium skeleton into a high-temperature resistant graphite crucible (or jade crucible).

[0228] The copper material is placed above or around the chromium framework;

[0229] Fill the gaps with corundum powder to prevent molten copper from flowing out;

[0230] (3.2) Melting process

[0231] Vacuuming: The vacuum level inside the furnace reaches 10.-1 Pa;

[0232] Warming phase:

[0233] Heat to 880℃ at a rate of 8℃ / min and hold for 30 minutes;

[0234] Continue heating to 1300℃ (higher than the melting point of copper, 1083℃), and hold for 15 minutes;

[0235] Heat preservation stage: Maintain at the highest temperature for 15 minutes to ensure that the molten copper completely penetrates into the pores of the skeleton;

[0236] Cooling: Cool in the furnace to below 200℃, then remove from the furnace;

[0237] (4) Post-processing

[0238] (4.1) Machining

[0239] The infiltrated billet is then cut, ground, and processed to achieve the required dimensions and precision; specific process conditions are shown in Table 3.

[0240] Process principle: Utilizing the melting point difference between copper and chromium (copper 1083℃, chromium 1857℃), liquid copper is infiltrated into a porous chromium framework under vacuum. The pores are filled through capillary action, forming a CuCr25 alloy. Since chromium is insoluble in liquid copper, a composite material structure of copper matrix and uniformly distributed chromium particles is ultimately obtained.

[0241] Performance testing

[0242] The performance of the copper-chromium alloy switch contacts prepared in each embodiment and comparative example was tested, and the results are shown in Table 2.

[0243] (1) The conductivity was measured using an eddy current conductivity meter, FD-101, and the testing method was in accordance with GB / T 11007-2008;

[0244] (2) The Brinell hardness was tested using an HBE-3000 electronic Brinell hardness tester, and the testing method was in accordance with GB / T 231.1-2018 "Metallic materials Brinell hardness test - Part 1: Test method";

[0245] (3) The microstructure was examined using a Leica DM750M metallurgical microscope, and the detection method was in accordance with GB / T 13298-2015;

[0246] (4) The LG-DK7735 CNC wire cutting machine was used, and the testing method was in accordance with GB / T 7926-2015 CNC reciprocating wire EDM machine. 100 samples were dissected and tested, and the internal defect rate was calculated.

[0247] (5) Production cycle refers to the total time (2.0~3.0h) from the start of smelting in step S1 to the production of qualified products in step S7.

[0248] (6) Energy consumption: 1200 kWh / ton.

[0249] Example 4 Product Requirements: CuCr25 alloy contacts for 72.5kV high-voltage vacuum circuit breakers; strip thickness 2.0mm±0.05mm; core performance requirements: conductivity ≥17MS / m, Brinell hardness ≥78HB, internal defect rate 0.

[0250] Example 5 Product Requirements: CuCr30 alloy contacts for 126kV high-voltage vacuum circuit breakers; strip thickness 2.5mm; core performance requirements: conductivity ≥17MS / m, Brinell hardness ≥78HB, internal defect rate 0.

[0251] Example 6 Product Requirements: CuCr40 alloy contacts for 252kV high-voltage vacuum circuit breakers; strip thickness 3.0mm±0.05mm; core performance requirements: conductivity ≥16MS / m, Brinell hardness ≥85HB, internal defect rate 0.

[0252] Table 1

[0253]

[0254] Table 2

[0255]

[0256] Table 3

[0257]

[0258] Table 2 shows that the core performance of the copper-chromium alloy switch contacts prepared in each embodiment of this application has met the standards, with a yield of 100% and no internal defects. The continuous production cycle is significantly reduced compared to the traditional intermittent melting and infiltration process in the comparative example, and the energy consumption is reduced by about 38-45%. For example, the typical production cycle of Example 4 is 2.5 hours, with a 38% reduction in energy consumption; the production cycle of Example 5 is 2.9 hours, with a 40% reduction in energy consumption; and the production cycle of Example 6 is 3.0 hours, with a 42% reduction in energy consumption.

[0259] The integrated continuous production system provided in this application organically integrates a melting furnace, a heat-insulating tundish, a horizontal continuous casting and rolling mill, a tunnel-type continuous annealing box, an online non-destructive testing instrument, a forced cooling box, and a high-speed precision stamping press linked to the testing instrument into a continuous automated production line via a horizontal conveying device. This continuous production device, combined with a continuous production process, integrates casting, hot rolling, annealing, and stamping processes, eliminating high-energy-consuming steps such as repeated heating of ingots and multiple intermediate annealing passes in traditional processes. The strip is directly fed into the annealing box hot, maximizing the utilization of residual heat from casting and rolling. Overall, compared to traditional processes, this process can reduce total energy consumption by 30% to 50%. Through continuous and integrated production, material transfer, storage, and waiting times between processes are eliminated, shortening the production cycle from several days to less than a few hours. Compared to traditional methods, the production cycle can be shortened by more than 30%, or even more, significantly reducing the new product introduction cycle. It can be compressed by 60%; the extremely high cooling rate during the casting and rolling process effectively suppresses the segregation of chromium, resulting in an extremely fine and uniform microstructure, fundamentally improving the material's performance consistency; the linkage between online non-destructive testing and the automatic stamping rejection system enables 100% inspection and online removal of internal defects, ensuring "zero defects" for outgoing products and reducing the product defect rate from a few percent in traditional processes to a few ten-thousandths; this continuous automated production line reduces manual intervention and can increase production speed by 40-60%; one-time forming to the target thickness reduces head and tail cutting losses and surface oxidation losses in traditional multi-pass rolling, significantly improving the material yield.

[0260] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those described herein.

[0261] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A continuous preparation apparatus for copper-chromium alloy products, characterized in that, The device includes: The smelting unit (1) is provided with a smelting inlet and a smelting outlet. The smelting unit (1) is used to smelt copper-chromium alloy raw materials into copper-chromium alloy melt. The continuous casting and rolling unit (2) is provided with a casting and rolling inlet and a casting and rolling outlet, wherein the smelting outlet and the casting and rolling inlet are connected; the continuous casting and rolling unit (2) is used to cast and roll the copper-chromium alloy melt to form a hot strip billet; The continuous annealing unit (3) is provided with an annealing inlet and an annealing outlet, and the casting outlet and the annealing inlet are connected; the continuous annealing unit (3) is used to anneal the hot strip to form an annealed strip. The first cooling unit (4) is provided with a first cooling inlet and a first cooling outlet, and the annealing outlet is connected to the first cooling inlet; the first cooling unit (4) is used to perform a first cooling on the annealed strip to form a first cooled strip. The non-destructive testing unit (5) is provided with a detection inlet, a detection outlet and a flaw detection signal outlet, and the first cooling outlet is connected to the detection inlet; the non-destructive testing unit (5) is used to detect the interior of the first cooling strip blank to determine the location of defects in the first cooling strip blank, and send the defect location information to the stamping control unit (6). The stamping control unit (6) is provided with a stamping inlet, a control signal inlet, a finished product outlet and a defective product outlet. The detection outlet is connected to the stamping inlet; the flaw detection signal outlet is connected to the control signal inlet; the stamping control unit (6) is used to stamp the first cooling strip blank that has passed through the non-destructive testing unit (5), remove defective products and sort out the copper-chromium alloy products.

2. The continuous production apparatus for copper-chromium alloy products according to claim 1, characterized in that, A heat preservation unit (7) is provided between the smelting unit (1) and the continuous casting and rolling unit (2). The heat preservation unit (7) is provided with a heat preservation inlet and a heat preservation outlet. The smelting outlet is connected to the heat preservation inlet, and the heat preservation outlet is connected to the casting and rolling inlet.

3. The continuous production apparatus for copper-chromium alloy products according to claim 2, characterized in that, The smelting outlet and the heat-insulating inlet are connected by a ceramic flow channel; And / or, the insulation outlet and the casting inlet are connected via a graphite casting nozzle; And / or, the insulation unit (7) is a graphite insulation intermediate package.

4. The continuous production apparatus for copper-chromium alloy products according to claim 1, characterized in that, A second cooling unit (8) is provided between the non-destructive testing unit (5) and the stamping control unit (6); the second cooling unit (8) is provided with a second cooling inlet and a second cooling outlet, the testing outlet is connected to the second cooling inlet; the second cooling outlet is connected to the stamping inlet; the second cooling unit (8) is used to perform a second cooling on the first cooling strip blank that has passed through the non-destructive testing unit (5) to form a second cooling strip.

5. The continuous production apparatus for copper-chromium alloy products according to claim 4, characterized in that, The second cooling unit (8) is a cooling box; And / or, the detection outlet and the second cooling inlet are connected by a sealing cover.

6. The continuous production apparatus for copper-chromium alloy products according to any one of claims 1 to 5, characterized in that, The smelting unit (1) is an induction melting furnace; And / or, the continuous casting and rolling unit (2) is a horizontal twin-roll continuous casting and rolling mill; And / or, the continuous annealing unit (3) is a tunnel-type continuous annealing box; And / or, the first cooling unit (4) is an air-cooled machine; And / or, the non-destructive testing unit (5) is an online eddy current non-destructive testing instrument or an ultrasonic phased array flaw detector; And / or, the stamping control unit (6) is a stamping machine.

7. The continuous production apparatus for copper-chromium alloy products according to any one of claims 1 to 5, characterized in that, The continuous casting and rolling unit (2) includes a twin-roll assembly (21) and a cooling system (22); the cooling system (22) includes a spiral cooling channel (221) and a temperature sensor (222); the twin-roll assembly (21) includes a roll body (211); inside the roll body (211), multiple sets of the spiral cooling channels (221) are sequentially arranged along the axial direction of the roll body (211).

8. The continuous production apparatus for copper-chromium alloy products according to claim 7, characterized in that, The inlet of the spiral cooling water channel (221) is located at the first shaft end of the roll body (211) and is connected to an external cooling water device. The outlet of the spiral cooling water channel (221) is located at the second shaft end of the roll body (211) and is connected to the external cooling water device. The temperature sensor (222) is located at the second shaft end and is used to detect the cooling water temperature at the outlet of the spiral cooling water channel (221). Each set of spiral cooling water channels (221) operates independently in a closed loop. The cooling water flow direction in the spiral cooling water channel (221) is opposite to the rotation direction of the roll body (211).

9. A continuous preparation method for copper-chromium alloy products, characterized in that, The method includes the following steps: Step S1: Obtain raw materials according to the ratio of each element in the copper-chromium alloy, and melt each raw material in the melting unit (1) to obtain copper-chromium alloy melt; Step S2: The copper-chromium alloy melt is continuously cast and rolled in the continuous casting and rolling unit (2) to obtain a hot strip billet; Step S3: The hot strip blank is continuously annealed in the continuous annealing unit (3) to obtain an annealed strip blank; Step S4: The annealed strip blank is subjected to a first cooling in the first cooling unit (4) to obtain a first cooled strip blank; Step S5: The first cooling strip blank is subjected to non-destructive testing in the non-destructive testing unit (5) to obtain the tested cooling strip blank; Step S6: The flaw detection cooling strip blank is stamped in the stamping control unit (6) to obtain the copper-chromium alloy product; The continuous preparation method of the copper-chromium alloy products adopts the continuous preparation apparatus of copper-chromium alloy products as described in any one of claims 1 to 8.

10. The continuous preparation method for copper-chromium alloy products according to claim 9, characterized in that, Between step S1 and step S2, there is also step S1-2: the copper-chromium alloy melt is kept at an intermediate temperature in the heat preservation unit (7) to obtain a heat preservation melt; the heat preservation melt is subjected to the continuous casting and rolling. And / or, between step S5 and step S6, there is also step S5-6: the flaw detection cooling strip blank is subjected to a second cooling in the second cooling unit (8) to obtain a second cooling strip blank; the second cooling strip blank is subjected to the stamping forming.

11. The continuous preparation method of copper-chromium alloy products according to claim 10, characterized in that, In steps S1-2, the copper-chromium alloy melt undergoes intermediate heat preservation in a graphite heat-preserving tundish to obtain the heat-preserving melt. And / or, in steps S5-6, the second cooling is performed using airflow or atomized water mist; wherein the pressure of the airflow is 0.4~0.8MPa; And / or, the second cooling time is 0.5~2.0 min; And / or, the temperature of the second cooling strip blank is 30~50℃; And / or, the flaw detection cooling strip blank undergoes the second cooling in a cooling box to obtain the second cooled strip blank.

12. The continuous preparation method of copper-chromium alloy products according to claim 9 or 10, characterized in that, In step S1, the elemental composition of the copper-chromium alloy includes: Cr 20~50%, doping elements 0.01~0.05%, the doping elements include Zr and / or Mg, and the balance is Cu, totaling 100%; And / or, the melting temperature is 1700~1950℃; And / or, the melting is carried out in an inert atmosphere; And / or, the raw materials are smelted in an induction melting furnace to obtain the copper-chromium alloy melt.

13. The continuous preparation method for copper-chromium alloy products according to claim 9 or 10, characterized in that, In step S2, the casting temperature of the copper-chromium alloy melt is 1700~1900℃; And / or, the cooling water temperature of the continuous casting and rolling is 20~35℃, the cooling water pressure is 0.3~1.0MPa, and the cooling rate is 100~500℃ / s; And / or, the rolling force of the continuous casting and rolling is 50~300t; And / or, the continuous casting speed is 5~15m / min; And / or, the thickness of the hot strip blank is 1.5~3.0mm and the width is 200~400mm; And / or, the copper-chromium alloy melt is continuously cast and rolled in a horizontal twin-roll continuous casting mill to obtain the hot strip.

14. The continuous preparation method of copper-chromium alloy products according to claim 9 or 10, characterized in that, In step S3, the temperature of the continuous annealing is 450~550℃, and the holding time of the continuous annealing is 1.0~2.5min; And / or, the atmosphere for the continuous annealing is nitrogen; And / or, the continuous annealing includes a preheating stage, a homogenizing stage, and a slow cooling stage; the temperature of the preheating stage is 300~400℃; the temperature of the homogenizing stage is 450~550℃; and the cooling rate of the slow cooling stage is 50~100℃ / min. And / or, the temperature of the annealed strip blank is 150~200℃; And / or, the hot strip blank is continuously annealed in a tunnel-type continuous annealing chamber to obtain the annealed strip blank.

15. The continuous preparation method of copper-chromium alloy products according to claim 9 or 10, characterized in that, In step S4, the first cooling is air cooling; And / or, the temperature of the first cooled strip blank is ≤110℃; And / or, the annealed strip blank undergoes the first cooling in an air cooler to obtain the first cooled strip blank; And / or, in step S5, the resolution of the non-destructive testing is 0.5~2.0mm, and the scanning speed is 5~15m / min; And / or, the first cooling strip blank undergoes non-destructive testing in an online eddy current non-destructive testing instrument or an ultrasonic phased array non-destructive testing instrument to obtain the tested cooling strip blank.

16. The continuous preparation method for copper-chromium alloy products according to claim 9 or 10, characterized in that, In step S6, the stamping speed of the stamping forming is 60~100 times / minute, and the stamping pressure is 150~250t; And / or, the response time for removing defective products during the stamping process is 0.01~0.05s; And / or, the flaw detection cooling strip blank is stamped in a stamping press to obtain the copper-chromium alloy product.

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