A method for preparing copper-manganese-nickel alloy rod material based on upward continuous casting process

Abstract

The present invention discloses a method for preparing copper-manganese-nickel alloy rod material based on an upward continuous casting process, comprising: S1, material preparation; S2, furnace heating; S3, material addition; S4, installation of a crystallizer; S5, upward casting; S6, winding; S7, sampling and testing. The present invention adopts advanced casting technology, and optimizes and designs various process parameters in the casting process, so that the prepared copper-manganese-nickel alloy has good consistency in composition, very little impurity content, uniform rod material structure, and no defects such as pores, inclusions, and composition deviation, which can meet the application of high-end products. In addition, the present invention can produce continuous, long-length cast rods, with very little material loss, high material utilization, low unit energy consumption, and low production cost.

Description

Technical Field

[0001] The invention relates to the technical field of metal material preparation, and in particular to a method for preparing copper-manganese-nickel alloy rod material based on an upward continuous casting process. Background Art

[0002] Copper-manganese alloy is a kind of resistance material. It is a basic material used to make resistance elements in electronic instruments, measuring instruments and other industrial devices. It is widely used in various fields such as motors, instruments, automobiles, aerospace, missiles, atomic energy, etc. It has a very small temperature coefficient of resistance, low electrothermal potential to copper, high resistance stability, and high resistivity. It is an excellent resistance alloy material and can be made into powder, wire, foil, sheet, strip, rod, tube and other shapes. The surface can also be covered with various insulating materials. It is mainly used to make standard electrical appliances, separators, precision or ordinary resistance elements, precision resistance elements for high-level measurement of voltage, current, bridges, potentiometers and other instruments, and more suitable for making standard resistors for reference. Due to its excellent performance, it will be widely used in mobile phones, power grids, new energy vehicles and other fields in the future, and the prospects are very broad.

[0003] At present, high-end manganese-copper alloys in the domestic market are all imported. Domestic production processes mostly use non-vacuum smelting. However, the alloy materials produced have high impurity content and uneven composition structure. The resistivity and temperature coefficient of resistance of the manufactured chip resistors do not meet the requirements and cannot be used in high-end fields. Summary of the invention

[0004] In view of the problems pointed out in the above background technology, the present invention provides a method for preparing copper-manganese-nickel alloy rod material based on an upward continuous casting process.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A method for preparing a copper-manganese-nickel alloy rod material based on an upward continuous casting process comprises the following steps:

[0007] S1. Prepare materials:

[0008] According to the weight percentage, the content of each element in the raw material is: Mn 11-13%, Ni 2-3%, and the balance is copper; wherein the Cu element is added in the form of oxygen-free copper rods, the Mn element is added in the form of CuMn70 master alloy, and the Ni element is added in the form of nickel wire; the oxygen-free copper rods are cut into a length of 800 mm / rod;

[0009] S2, oven heating:

[0010] First, raise the furnace temperature to 600℃, keep it warm for 6 hours, open the furnace cover to supply argon; then raise the furnace temperature to 1200℃, keep it warm for 12 hours, and the furnace heating process ends after the holding time is up;

[0011] Note: There are two purposes for heating the furnace: 1) When the furnace is not in use and not heated, it will absorb moisture in the air. The purpose of the furnace is to dry the moisture absorbed by the crucible, refractory materials, etc.; 2) There is a process of heating the furnace, which is also a protection for the crucible to prevent the crucible from heating up too quickly and causing the crucible to crack;

[0012] S3, adding materials:

[0013] Add a portion of oxygen-free copper rods cut from S1 into the crucible, add 20-25 kg each time, and add in 20-30 times, then turn on the oxygen-free copper rod automatic wire feeder of the upper continuous casting furnace, and continue to add oxygen-free copper rods; stop adding oxygen-free copper rods when the weight of the copper liquid in the furnace reaches 1500-1700 kg;

[0014] Then add 300-360kg CuMn70 master alloy, half of which is added to the feeding area and half to the casting area, and then turn on the nickel wire automatic feeding machine and add 30-60kg nickel wire;

[0015] Note: Prepare a part of the cut oxygen-free copper rods in advance and add them when there is no material in the crucible. This is because when there is no material in the crucible, the oxygen-free copper rods cannot be used to automatically feed the material. After manually adding this part of the oxygen-free copper rods, there will be some copper liquid at the bottom of the crucible, and then the oxygen-free copper rods can be automatically fed.

[0016] S4. Install the crystallizer:

[0017] After the crystallizer is assembled, install the crystallizer on the traction frame, install the guide head on the head of the guide rod, and insert the guide rod into the crystallizer from the tail of the crystallizer, with the guide head exposed 20 to 50 mm; clamp the clamping wheel of the traction frame to fix the guide rod, connect the crystallizer cooling water pipe, and open the cooling water flow to 40 to 70 L / min;

[0018] S5, upward casting:

[0019] Operate the traction frame on the PLC to lower the crystallizer into the melt. The lowering depth is 150 to 200 mm.

[0020] Turn on the servo motor, start casting according to the pre-set casting parameters, and turn on the oxygen-free copper rod and nickel wire automatic feeding machine at the same time. The feeding speed of the oxygen-free copper rod is 20% of the maximum feeding speed of the oxygen-free copper rod designed by the equipment. The feeding speed of the nickel wire is 1.2-1.5 kg of nickel wire for every 50 kg of oxygen-free copper rod added; the feeding speed of the CuMn70 master alloy is 10-12 kg of CuMn70 master alloy for every 50 kg of oxygen-free copper rod added;

[0021] Note: Upward continuous casting is continuous casting. When there is about 2000kg of molten copper in the crucible, casting is carried out while adding materials to ensure that the molten copper in the crucible is dynamically balanced. About 2000kg of molten copper needs to be maintained.

[0022] S6, Rolling:

[0023] When the casting rod rises to be clamped by the traction clamp wheel, remove the auxiliary guide rod, connect the guide rope to the head of the casting rod, and twist the take-up capstan to tilt the casting rod to the side of the take-up machine; as the casting rod rises, twist the take-up capstan until the casting rod passes through the winding clamp roller, set the winding diameter to 1500-1800mm on the PLC, remove the guide rope, and start automatic winding;

[0024] S7. Sampling and testing.

[0025] Furthermore, in the above scheme, in step S1, the Cu element content of the oxygen-free copper rod is 100%, the Ni element content of the nickel wire is 100%, and the Mn element content of the CuMn70 master alloy is 70% and the Cu element content is 30%.

[0026] Note: Strictly controlling the purity of each raw material can ensure that the finished product does not contain other impurities and improve product quality.

[0027] Furthermore, in the above scheme, the maximum feeding speed of the oxygen-free copper rod designed by the equipment is 1000kg / min.

[0028] Note: In actual operation, the maximum feeding speed of the oxygen-free copper rod of the equipment is determined by the equipment's own configuration, and the feeding speed can be adjusted and set according to the process requirements.

[0029] Furthermore, in the above scheme, in step S3, the oxygen-free copper rod is continuously fed at 10% of the maximum feeding speed of the oxygen-free copper rod designed for the equipment.

[0030] Note: At the beginning, the feeding speed should not be too fast or too slow. On the one hand, it is necessary to ensure that the added oxygen-free copper rod is fully melted, and on the other hand, it is necessary to add enough oxygen-free copper rod as quickly as possible.

[0031] Furthermore, in the above scheme, in step S3, after adding 30-60 kg of nickel wire, sampling is performed to detect the chemical composition. If the chemical composition meets the requirements of Mn 11-13%, Ni 2-3%, and the remainder is copper, the addition is stopped.

[0032] Note: Conducting a component test before casting helps ensure that the content of each component in the finished product meets the requirements.

[0033] Further, in the above scheme, in step S4, the crystallizer includes: a crystallizer graphite jacket, a crystallizer sleeve, and a crystallizer water-cooling jacket arranged in sequence from left to right, and a plurality of graphite connecting pipes are arranged in sequence in the extension direction of the inner parts of the crystallizer graphite jacket, the crystallizer sleeve, and the crystallizer water-cooling jacket, and the left end of the crystallizer graphite jacket is penetrated by a graphite casting mold connected to the leftmost graphite connecting pipe, a first refractory fiber sheet is arranged between the crystallizer graphite jacket and the crystallizer sleeve, a second refractory fiber sheet is arranged on the inner wall of the left end face of the crystallizer graphite jacket, a winding refractory fiber is arranged on the circumferential inner wall of the crystallizer graphite jacket, a small hole is opened at the bottom of the crystallizer graphite jacket, and the gap between the crystallizer graphite jacket and the graphite casting mold is sealed by graphite mud, and the rightmost section of the crystallizer water-cooling jacket is provided with a crystallizer cold end cover.

[0034] Furthermore, in the above solution, in step S4, the lead is made of oxygen-free copper.

[0035] Note: Using oxygen-free copper as the lead can avoid the introduction of other impurities.

[0036] Furthermore, in the above scheme, in step S5, the upward casting parameters are: pulling upward by 4 to 10 mm, pausing for 0.1 to 0.4 seconds, and the pulling speed is 200 to 400 mm per minute.

[0037] Note: The above casting parameters are deleted to obtain the best parameters after multiple tests and adjustments, which ensures the casting efficiency without reducing the quality of the finished product.

[0038] Furthermore, in the above scheme, in step S7, after cutting off 500 mm of the head with hydraulic shears, a body sample is taken to detect the chemical composition.

[0039] Note: After cutting off a section of the head with a hydraulic shear, the components in the middle of the product are detected, which can more truly reflect the component content of the product and reduce deviation.

[0040] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0041] First, the present invention adopts advanced casting technology and optimizes the design of various process parameters in the casting process to ensure that the composition of the prepared copper-manganese-nickel alloy is consistent. In addition to the main elements such as Cu, Mn, and Ni, the impurity content of the material is extremely small, the material purity is high, the rod material structure is uniform, and there are no defects such as pores, inclusions, and composition deviation, which can meet the application of high-end products.

[0042] Secondly, the present invention can produce continuous, long-length cast rods with minimal material loss, high material utilization, low unit energy consumption and low production cost.

[0043] Third, the copper-manganese-nickel alloy rod material produced by the present invention is used to make chip resistor products, which have a very wide range of applications, such as automotive electronics, power electronics, drive technology, power supply detection and medical technology, and have a very broad prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a process flow chart of the present invention;

[0045] Figure 2 A schematic diagram of the internal structure of a crystallizer of the present invention;

[0046] Figure 3 It is a schematic diagram of the external structure of the crystallizer of the present invention. DETAILED DESCRIPTION

[0047] Example 1

[0048] A method for preparing a copper-manganese-nickel alloy rod material based on an upward continuous casting process comprises the following steps:

[0049] S1. Prepare materials:

[0050] According to the weight percentage, the content of each element in the raw material is: Mn 11.5%, Ni 2.5%, and the balance is copper; wherein the Cu element is added in the form of oxygen-free copper rods, the Mn element is added in the form of CuMn70 master alloy, and the Ni element is added in the form of nickel wire; the oxygen-free copper rods are cut into a length of 800 mm / rod, and 600 kg is cut first;

[0051] The Cu content of the oxygen-free copper rod is 100%, the Ni content of the nickel wire is 100%, and the Mn content of the CuMn70 master alloy is 70% and the Cu content is 30%;

[0052] S2, oven heating:

[0053] First, raise the furnace temperature to 600℃, keep it warm for 6 hours, open the furnace cover to supply argon; then raise the furnace temperature to 1200℃, keep it warm for 12 hours, and the heating process of the furnace is finished after the holding time is up;

[0054] S3, adding materials:

[0055] Add a portion of oxygen-free copper rods cut from S1 into the crucible, add 20 kg each time, and add in 30 times, then turn on the oxygen-free copper rod automatic wire feeder of the upward continuous casting furnace, and continue to feed the oxygen-free copper rods at a feeding rate of 100 kg / min; stop adding oxygen-free copper rods when the weight of the copper liquid in the furnace reaches 1600 kg;

[0056] Then add 340kg CuMn70 master alloy, half of which is added to the feeding area and half to the casting area, then turn on the nickel wire automatic feeding machine, add 40kg nickel wire, then take samples to detect the chemical composition, the chemical composition is: Mn 11.5%, Ni 2.51%, the balance is copper, stop adding materials;

[0057] S4. Install the crystallizer:

[0058] After the crystallizer is assembled, install the crystallizer on the traction frame, install the guide head at the head of the guide rod, the guide head is made of oxygen-free copper, and the guide rod is inserted into the crystallizer from the tail of the crystallizer, with the guide head exposed 45mm; clamp the clamping wheel of the traction frame to fix the guide rod, connect the crystallizer cooling water pipe, and open the cooling water flow to 65L / min;

[0059] S5, upward casting:

[0060] Operate the traction frame on the PLC to lower the crystallizer into the melt. The lowering depth is 200mm when the crystallizer is immersed in the melt.

[0061] The servo motor is turned on, and casting is started according to the pre-set casting parameters. At the same time, the oxygen-free copper rod and nickel wire automatic wire feeding machines are turned on. The wire feeding speed of the oxygen-free copper rod is 100 kg / min, and the nickel wire feeding speed is 1.2 kg for every 50 kg of oxygen-free copper rod added; the CuMn70 master alloy feeding speed is 11 kg for every 50 kg of oxygen-free copper rod added;

[0062] The upward casting parameters are: pulling upward 6mm, pausing 0.2S, and pulling speed of 200mm per minute;

[0063] S6, Rolling:

[0064] When the casting rod rises to be clamped by the traction clamp wheel, remove the auxiliary guide rod, connect the guide rope to the casting rod head, twist the take-up capstan to make the casting rod tilt to the side of the take-up machine; as the casting rod rises, twist the take-up capstan until the casting rod passes through the winding clamp roller, set the winding diameter to 1500mm on the PLC, remove the guide rope, and start automatic winding;

[0065] S7. Sampling and testing:

[0066] After cutting off 500mm of the head with hydraulic shears, take a sample of the body to test the chemical composition.

[0067] The crystallizer comprises: a crystallizer graphite jacket 6, a crystallizer sleeve 10, and a crystallizer water-cooling jacket 1 which are arranged in sequence from left to right; a plurality of graphite pipes 3 are arranged in sequence in the extension direction of the inner parts of the crystallizer graphite jacket 6, the crystallizer sleeve 10, and the crystallizer water-cooling jacket 1; a graphite casting mold 2 connected to the leftmost graphite pipe 3 is penetrated through the left end of the crystallizer graphite jacket 6; a first refractory fiber sheet 4 is arranged between the crystallizer graphite jacket 6 and the crystallizer sleeve 10; a second refractory fiber sheet 7 is arranged on the inner wall of the left end face of the crystallizer graphite jacket 6; a winding refractory fiber 8 is arranged on the circumferential inner wall of the crystallizer graphite jacket 6; a small hole is opened at the bottom of the crystallizer graphite jacket 6; the gap between the crystallizer graphite jacket 6 and the graphite casting mold 2 is sealed by graphite mud 9; and a crystallizer cold end cover 5 is arranged at the rightmost section of the crystallizer water-cooling jacket 1.

[0068] Example 2

[0069] A method for preparing a copper-manganese-nickel alloy rod material based on an upward continuous casting process comprises the following steps:

[0070] S1. Prepare materials:

[0071] According to the weight percentage, the content of each element in the raw material is: Mn 12%, Ni 2.8%, and the balance is copper; wherein the Cu element is added in the form of oxygen-free copper rods, the Mn element is added in the form of CuMn70 master alloy, and the Ni element is added in the form of nickel wire; the oxygen-free copper rods are cut into 800 mm / rod lengths, and 600 kg are cut first;

[0072] The Cu content of the oxygen-free copper rod is 100%, the Ni content of the nickel wire is 100%, and the Mn content of the CuMn70 master alloy is 70% and the Cu content is 30%;

[0073] S2, oven heating:

[0074] First, raise the furnace temperature to 600℃, keep it warm for 6 hours, open the furnace cover to supply argon; then raise the furnace temperature to 1200℃, keep it warm for 12 hours, and the furnace heating process ends after the holding time is up;

[0075] S3, adding materials:

[0076] Add a portion of oxygen-free copper rods cut from S1 into the crucible, add 25 kg each time, and add in 24 times, then turn on the oxygen-free copper rod automatic wire feeder of the upward continuous casting furnace, and continue to feed the oxygen-free copper rods at a feeding rate of 100 kg / min; stop adding oxygen-free copper rods when the weight of the copper liquid in the furnace reaches 1600 kg;

[0077] Then add 350kg CuMn70 master alloy, half of which is added to the feeding area and half to the casting area, then turn on the nickel wire automatic feeding machine, add 50kg nickel wire, then take samples to test the chemical composition, the test results are Cu: balance, Mn: 11.98%, Ni: 2.82%, stop adding materials;

[0078] S4. Install the crystallizer:

[0079] After the crystallizer is assembled, install the crystallizer on the traction frame, install the guide head on the head of the guide rod, the guide head is made of oxygen-free copper, and the guide rod is inserted into the crystallizer from the tail of the crystallizer, with the guide head exposed 30mm; clamp the clamping wheel of the traction frame to fix the guide rod, connect the crystallizer cooling water pipe, and open the cooling water flow to 60L / min;

[0080] S5, upward casting:

[0081] Operate the traction frame on the PLC to lower the crystallizer into the melt. The lowering depth is 180mm when the crystallizer is immersed in the melt.

[0082] The servo motor is turned on, and casting is started according to the pre-set casting parameters. At the same time, the oxygen-free copper rod and nickel wire automatic feeding machine are turned on. The feeding speed of the oxygen-free copper rod is 200 kg / min, and the nickel wire feeding speed is 1.5 kg for every 50 kg of oxygen-free copper rod added; the CuMn70 master alloy feeding speed is 11.7 kg for every 50 kg of oxygen-free copper rod added;

[0083] The upward casting parameters are: pulling upward 8mm, pausing 0.12S, and pulling speed of 380mm per minute;

[0084] S6, Rolling:

[0085] When the casting rod rises to be clamped by the traction clamp wheel, remove the auxiliary guide rod, connect the guide rope to the casting rod head, twist the take-up capstan to make the casting rod tilt to the side of the take-up machine; as the casting rod rises, twist the take-up capstan until the casting rod passes through the winding clamp roller, set the winding diameter to 1800mm on the PLC, remove the guide rope, and start automatic winding;

[0086] S7. Sampling and testing:

[0087] After cutting off 500mm of the head with hydraulic shears, take a sample of the body to test the chemical composition.

[0088] Example 3

[0089] A method for preparing a copper-manganese-nickel alloy rod material based on an upward continuous casting process comprises the following steps:

[0090] S1. Prepare materials:

[0091] According to weight percentage, the content of each element in the raw material is: Mn 13%, Ni 3%, and the balance is copper; wherein the Cu element is added in the form of oxygen-free copper rods, the Mn element is added in the form of CuMn70 master alloy, and the Ni element is added in the form of nickel wires; the oxygen-free copper rods are cut into a length of 800 mm / rod;

[0092] The Cu content of the oxygen-free copper rod is 100%, the Ni content of the nickel wire is 100%, and the Mn content of the CuMn70 master alloy is 70% and the Cu content is 30%;

[0093] S2, oven heating:

[0094] First, raise the furnace temperature to 600℃, keep it warm for 6 hours, open the furnace cover to supply argon; then raise the furnace temperature to 1200℃, keep it warm for 12 hours, and the heating process of the furnace is finished after the holding time is up;

[0095] S3, adding materials:

[0096] Add a portion of oxygen-free copper rods cut from S1 into the crucible, add 24 kg each time, and add in 25 times, then turn on the oxygen-free copper rod automatic wire feeder of the upward continuous casting furnace, and continue to feed the oxygen-free copper rods at a feeding rate of 100 kg / min; stop adding oxygen-free copper rods when the weight of the copper liquid in the furnace reaches 1700 kg;

[0097] Then add 360kg CuMn70 master alloy, half of which is added to the feeding area and half to the casting area, then turn on the nickel wire automatic feeding machine and add 60kg nickel wire;

[0098] S4. Install the crystallizer:

[0099] After the crystallizer is assembled, install the crystallizer on the traction frame, install the guide head at the head of the guide rod, the guide head is made of oxygen-free copper, and the guide rod is inserted into the crystallizer from the tail of the crystallizer, with the guide head exposed 20mm; clamp the clamping wheel of the traction frame to fix the guide rod, connect the crystallizer cooling water pipe, and open the cooling water flow to 70L / min;

[0100] S5, upward casting:

[0101] Operate the traction frame on the PLC to lower the crystallizer into the melt. The lowering depth is 150mm for the crystallizer to be immersed in the melt.

[0102] The servo motor is turned on, and casting is started according to the pre-set casting parameters. At the same time, the oxygen-free copper rod and nickel wire automatic feeding machine are turned on. The feeding speed of the oxygen-free copper rod is 200 kg / min, and the nickel wire feeding speed is 1.5 kg for every 50 kg of oxygen-free copper rod added; the CuMn70 master alloy feeding speed is 12 kg for every 50 kg of oxygen-free copper rod added;

[0103] The upward casting parameters are: pulling upward 10mm, pausing 0.4S, and pulling speed of 400mm per minute;

[0104] S6, Rolling:

[0105] When the casting rod rises to be clamped by the traction clamp wheel, remove the auxiliary guide rod, connect the guide rope to the casting rod head, twist the take-up capstan to make the casting rod tilt to the side of the take-up machine; as the casting rod rises, twist the take-up capstan until the casting rod passes through the winding clamp roller, set the winding diameter to 1600mm on the PLC, remove the guide rope, and start automatic winding;

[0106] S7. Sampling and testing:

[0107] After cutting off 500mm of the head with hydraulic shears, take a sample of the body to test the chemical composition.

[0108] Example 4

[0109] It is basically the same as Example 2, except that in step S3,

[0110] First, continue to add oxygen-free copper rods at a feeding rate of 100kg / min. After the weight of the copper liquid in the furnace reaches 1200kg, set the feeding rate to 200kg / min. Stop adding oxygen-free copper rods until the weight of the copper liquid in the furnace reaches 1600kg.

[0111] Comparative Example 1

[0112] The method is basically the same as Example 2, except that in step S3, the feeding method is:

[0113] Take 600 kg of oxygen-free copper rods cut from S1 and add them into the crucible at one time, then turn on the oxygen-free copper rod automatic wire feeder of the upward continuous casting furnace, and continue to feed the oxygen-free copper rods at a feeding rate of 600 kg / min; stop adding oxygen-free copper rods when the weight of the copper liquid in the furnace reaches 1600 kg;

[0114] Then add 350kg CuMn70 master alloy, half of which is added to the feeding area and half to the casting area. Then turn on the nickel wire automatic feeding machine and add 50kg nickel wire. Then, take samples to test the chemical composition. The test results are Cu: balance, Mn: 11.98%, Ni: 2.82%, and stop adding.

[0115] Comparative Example 2

[0116] It is basically the same as Example 2, except that in step S5, the upward continuous casting method is:

[0117] Operate the traction frame on the PLC to lower the crystallizer into the melt. The lowering depth is 180mm when the crystallizer is immersed in the melt.

[0118] The servo motor is turned on, and casting is started according to the pre-set casting parameters. At the same time, the oxygen-free copper rod and nickel wire automatic feeding machine are turned on. The feeding speed of the oxygen-free copper rod is 500kg / min, and the nickel wire feeding speed is 1.5kg of nickel wire for every 50kg of oxygen-free copper rod added; the CuMn70 master alloy feeding speed is 11.7kg of CuMn70 master alloy for every 50kg of oxygen-free copper rod added;

[0119] The upward casting parameters are: pulling upward 12mm, pausing 0.1S, and pulling speed of 600mm per minute;

[0120] The copper-manganese-nickel alloy rod material samples prepared by the methods of the above-mentioned Examples 1-4 and Comparative Examples 1-2 were tested respectively, and the test results are shown in Table 1.

[0121] Table 1 Test results of copper-manganese-nickel alloy rod materials of Examples 1-4 and Comparative Examples 1-2

[0122] element Cu / % Mn / % Ni / % The rest of the total / % Example 1 86.06 11.47 2.46 0.01 Example 2 85.19 12.03 2.77 0.01 Example 3 85.80 11.64 2.55 0.01 Example 4 86.00 11.45 2.54 0.01 Comparative Example 1 85.56 11.95 2.46 0.03 Comparative Example 2 85.82 11.63 2.51 0.04

[0123] It can be seen from Table 1 that the copper-manganese-nickel alloy rod material prepared by the method of the present invention has very little impurity content except for the main elements such as Cu, Mn and Ni, and the purity of the material is high.

[0124] In addition, through appearance comparison, it was found that since Comparative Examples 1 and Comparative Examples 2 did not perform material feeding and upward continuous casting according to the method of the present invention, the rod material structure was not uniform and had defects such as slight pores.

Claims

1. A method for preparing copper-manganese-nickel alloy rod material based on upward continuous casting process, characterized in that: The following steps are involved: S1. Prepare materials: According to the weight percentage, the content of each element in the raw material is: Mn 11-13%, Ni 2-3%, and the balance is copper; wherein the Cu element is added in the form of oxygen-free copper rods, the Mn element is added in the form of CuMn70 master alloy, and the Ni element is added in the form of nickel wire; the oxygen-free copper rods are cut into a length of 800 mm / rod; S2, oven heating: First, raise the furnace temperature to 600℃, keep it warm for 6 hours, open the furnace cover to supply argon; then raise the furnace temperature to 1200℃, keep it warm for 12 hours, and the heating process of the furnace is finished after the holding time is up; S3, adding materials: Add a portion of oxygen-free copper rods cut from S1 into the crucible, add 20-25 kg each time, and add in 20-30 times, then turn on the oxygen-free copper rod automatic wire feeder of the upper continuous casting furnace, and continue to add oxygen-free copper rods; stop adding oxygen-free copper rods when the weight of the copper liquid in the furnace reaches 1500-1700 kg; Then add 300-360kg CuMn70 master alloy, half of which is added to the feeding area and half to the casting area, and then turn on the nickel wire automatic feeding machine and add 30-60kg nickel wire; S4. Install the crystallizer: After the crystallizer is assembled, install the crystallizer on the traction frame, install the guide head on the head of the guide rod, and insert the guide rod into the crystallizer from the tail of the crystallizer, with the guide head exposed 20 to 50 mm; clamp the clamping wheel of the traction frame to fix the guide rod, connect the crystallizer cooling water pipe, and open the cooling water flow to 40 to 70 L / min; S5, upward casting: Operate the traction frame on the PLC to lower the crystallizer into the melt. The lowering depth is 150 to 200 mm. Turn on the servo motor, start casting according to the pre-set casting parameters, and turn on the oxygen-free copper rod and nickel wire automatic feeding machine at the same time. The feeding speed of the oxygen-free copper rod is 20% of the maximum feeding speed of the oxygen-free copper rod designed by the equipment. The feeding speed of the nickel wire is 1.2-1.5 kg of nickel wire for every 50 kg of oxygen-free copper rod added; the feeding speed of the CuMn70 master alloy is 10-12 kg of CuMn70 master alloy for every 50 kg of oxygen-free copper rod added; S6, Rolling: When the casting rod rises to be clamped by the traction clamp wheel, remove the auxiliary guide rod, connect the guide rope to the head of the casting rod, and twist the take-up capstan to tilt the casting rod to the side of the take-up machine; as the casting rod rises, twist the take-up capstan until the casting rod passes through the winding clamp roller, set the winding diameter to 1500-1800mm on the PLC, remove the guide rope, and start automatic winding; S7, sampling and testing; In step S3, the oxygen-free copper rod is continuously fed at 10% of the maximum feeding rate of the oxygen-free copper rod designed for the equipment; In step S3, after adding 30-60 kg of nickel wire, sampling is performed to detect the chemical composition. If the chemical composition meets the requirements of Mn 11-13%, Ni 2-3%, and the balance is copper, the addition is stopped; In step S4, the crystallizer comprises: a crystallizer graphite jacket (6), a crystallizer sleeve (10), and a crystallizer water cooling jacket (1) which are arranged in sequence from left to right; a plurality of graphite pipes (3) are arranged in sequence in the inner extension direction of the crystallizer graphite jacket (6), the crystallizer sleeve (10), and the crystallizer water cooling jacket (1); a graphite casting mold (2) connected to the leftmost graphite pipe (3) is penetrated at the left end of the crystallizer graphite jacket (6); and the crystallizer graphite jacket (6) and A first refractory fiber sheet (4) is arranged between the crystallizer sleeves (10), a second refractory fiber sheet (7) is arranged on the inner wall of the left end surface of the crystallizer graphite jacket (6), a wound refractory fiber (8) is arranged on the circumferential inner wall of the crystallizer graphite jacket (6), a small hole is opened at the bottom of the crystallizer graphite jacket (6), a gap between the crystallizer graphite jacket (6) and the graphite casting mold (2) is sealed by graphite mud (9), and the rightmost section of the crystallizer water cooling jacket (1) is provided with a crystallizer cold end cover (5); In step S5, the upward casting parameters are: pulling upward by 4 to 10 mm, pausing for 0.1 to 0.4 seconds, and the pulling speed is 200 to 400 mm per minute.

2. The method for preparing copper-manganese-nickel alloy rod material based on upward continuous casting process according to claim 1, characterized in that: In step S1, the Cu element content of the oxygen-free copper rod is 100%, the Ni element content of the nickel wire is 100%, and the Mn element content of the CuMn70 master alloy is 70% and the Cu element content is 30%.

3. The method for preparing copper-manganese-nickel alloy rod material based on upward continuous casting process according to claim 1, characterized in that: The maximum feeding speed of oxygen-free copper rod designed by the equipment is 1000 kg / min.

4. The method for preparing copper-manganese-nickel alloy rod material based on upward continuous casting process according to claim 1, characterized in that: In step S4, the lead is made of oxygen-free copper.

5. The method for preparing copper-manganese-nickel alloy rod material based on upward continuous casting process according to claim 1, characterized in that: In step S7, after cutting off 500 mm of the head with hydraulic shears, a body sample is taken to detect the chemical composition.

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