CN-120984674-B - Continuous extrusion processing technology of rare earth Y modified oxygen-free copper

Abstract

The invention discloses a continuous extrusion processing technology of rare earth Y modified oxygen-free copper, which belongs to the technical field of copper processing, and takes 99.99% of cathode copper and 0.006% of rare earth Y as raw materials, and after the raw materials are smelted under the protection of argon, ingot casting is homogenized and annealed for 500 ℃ multiplied by 1.5 hours, then cold rolling is carried out for multiple times, the parameters of the cold rolling are controlled to be total strain eta=2.5, the cross section area is reduced by 92%, then a strip blank is prepared, then an inner cooling mould with a mosaic cavity and a water cooling extrusion wheel is adopted for continuous extrusion under the preheating of 500 ℃, water cooling quenching and annealing are carried out for 500 ℃ multiplied by 0.5 hours after extrusion, and finally, the target size is finished, so that the straightness of a finished product is less than or equal to 0.5mm/m. The invention realizes the comprehensive jump of the strength, the conductivity and the corrosion resistance of the oxygen-free copper through the cooperative optimization of rare earth purification, temperature control deformation and rapid annealing, so the invention solves the technical problems of how to improve the conductivity, the corrosion resistance and the like of the copper.

Inventors

• WANG RUNYANG
• XUE ZHIPENG

Assignees

• 博罗县鹏成铜业有限公司

Dates

Publication Date

20260512

Application Date

20250813

Claims (1)

1. 1. A continuous extrusion processing technology of rare earth Y modified oxygen-free copper is characterized by comprising the steps of taking cathode copper and rare earth element Y as raw materials, smelting and ingot homogenizing annealing under the protection of argon, preparing a strip blank after multi-pass cold rolling, adopting an inner cooling type die to carry out continuous extrusion under the condition of preheating at 500 ℃, carrying out water cooling quenching after extrusion and annealing by adopting the working procedure of 500 ℃ for 0.5h, and finally finishing a copper material to a preset size, wherein the method comprises the following specific steps of: S1, raw material preparation: a. Preparing materials, namely taking 99.99 percent of cathode copper plate, and adding 0.006 percent of rare earth element Y according to the mass ratio; b. Smelting, namely smelting in a vacuum frequency induction furnace, filling argon into the furnace for protection, controlling the flow rate to be 10L/min and the temperature to be 1150-1180 ℃, adding a 0.01% charcoal coating layer to adsorb impurities, preserving heat for 30min, and skimming; c. Casting ingot into copper mould with preheating temperature of 300 deg.C to form ingot with length, width and thickness of 40mm, 20mm and 3mm, and cooling rate of 50 deg.C/s or more; d. homogenizing annealing, namely annealing in a box furnace with the temperature of 500 ℃ multiplied by 1.5h, cooling to 200 ℃ along with the furnace, and then air-cooling; S2, extrusion pretreatment: a. Cold rolling deformation, namely cold rolling the cast ingot for multiple passes, wherein the total strain eta=2.5, and the reduction rate of the corresponding sectional area is 92 percent, and the formula is as follows: , the method is characterized in that the initial sectional area of an ingot before cold rolling is in mm < 2 >, the final sectional area of a material after cold rolling is in mm < 2 >, eta is true strain, and the deformation of each pass is controlled to be less than or equal to 20%; b. pickling and drying, namely pickling solution, namely soaking the pickling solution in 10% H 2 SO 4 +5%H 2 O 2 at room temperature for 5min, washing the pickling solution with deionized water, and treating the pickling solution in a 80 ℃ hot air circulation drying oven for 20min; c. end welding, namely butt-jointing the end parts of the rolled plates into a continuous strip blank by adopting argon arc welding, wherein the welding line strength is more than or equal to 90 percent of base metal, and polishing a welding line area into a 30-degree inclined plane for transition; s3, continuously extruding: a. the die assembly comprises an embedded cavity, an inner cooling type extrusion wheel, a water channel with the diameter of 10mm arranged between the side body and the workpiece, a water inlet and outlet channel with the diameter of 4mm of an inner cooling baffle block and an angle of 17 degrees; b. preheating a mould, namely closing a gate of the extension groove, heating to 500+/-10 ℃ by resistance, and preserving heat for 1h; c. The extrusion parameters are that the extrusion temperature is set to 400-450 ℃, and the cooling water flow rate is set to 20L/min at room temperature; s4, cooling and annealing: a. On-line water cooling, wherein a spray ring is arranged at the extrusion outlet, the water temperature is 10-15 ℃, and the cooling rate is more than 100 ℃ per second; b. Annealing the finished product, namely treating the finished product by a continuous annealing furnace at 500 ℃ for 0.5h and protecting the finished product by nitrogen; c. Cooling mode, annealing and air cooling; s5, finishing: a. cold rolling/drawing, namely, the annealed strip is processed to be a wire rod with the diameter of phi 3-12mm through a four-roller finishing mill with the thinning rate of 20-30 percent and the target thickness of +/-0.01 mm or is processed to be the surface roughness Ra of less than or equal to 0.8 mu m through an inverted drawing machine with the die angle of 12 degrees; b. precision sawing, namely cutting by a double-head circular saw, wherein the length is 3-4m, the tolerance is +/-1 mm, and the laser range finder is used for real-time calibration; c. straightening and shaping, namely a double-plane roller straightener, wherein the roller spacing is 50mm, the pressure is 8MPa, the straightness is less than or equal to 0.5mm/m, and the surface polishing comprises a fiber wheel and diamond gypsum, and the roughness Ra is less than or equal to 0.2 mu m.

Description

Continuous extrusion processing technology of rare earth Y modified oxygen-free copper Technical Field The invention relates to the technical field of copper material processing, in particular to a continuous extrusion processing technology of rare earth Y modified oxygen-free copper. Background At present, the copper production process is developed in the directions of high efficiency, low consumption, saving and environmental protection, and although the service life of the copper processing continuous extrusion process is shorter, the copper flat wire, the copper bar, the copper strip and other industrial production products are manufactured, and good economic benefit and social benefit are obtained. The continuous extrusion technology is simpler than the traditional technological process and has smaller metal atom gap, the technology is widely applied to domestic wire rod processing, the thermoplasticity of copper products can be improved through multidirectional continuous extrusion processing, copper parts with complex structures or high requirements on the wall surfaces of the products can be produced, the processing requirements can be met during actual use, and the thermodynamic performance of the products can be effectively improved. Based on the above, the Chinese patent document with the publication number of CN115376758A discloses a production process of a high-strength copper-chromium-zirconium contact line, which comprises the following steps of preparing a copper-chromium-zirconium rod material, continuously extruding, carrying out primary cold working, carrying out heat treatment and secondary cold working, wherein in the continuous extrusion, a compacting wheel presses the copper-chromium-zirconium rod material into an extrusion groove of the extrusion wheel, the copper-chromium-zirconium rod is brought into an extrusion forming die through rotation of the extrusion wheel, the copper-chromium-zirconium contact line is extruded, the extrusion groove is U-shaped, the groove wall of the extrusion groove is smooth, and the top of the extrusion groove is symmetrically rounded. Among the technical scheme that this patent document revealed, it is through smooth to extrusion wheel groove wall, the notch chamfer, does benefit to extrusion waste material and overflows, reduces the extrusion force, reduces extrusion temperature, carries out the forced air cooling to extrusion wheel groove simultaneously, further reduces temperature extrusion temperature, makes extrusion temperature maintain in lower scope to alloy element is separated less in extrusion process, and extruded product conductivity is lower, more is favorable to improving product strength in the follow-up ageing in-process. However, the production process of the high-strength copper-chromium-zirconium contact wire disclosed in the prior art also has the technical problems that the conductivity, corrosion resistance and the like of the copper material cannot be improved. Specifically, the prior art mainly adopts the steps of enabling the groove wall of the extrusion wheel to be smooth and enabling the groove opening to be rounded, so that extrusion waste materials are convenient to overflow, extrusion force is reduced, extrusion temperature is lowered, alloy elements are less separated out in the extrusion process, and the conductivity of an extruded product is lower. In practical applications, due to the complexity of the cabling environment and limited space, the copper wire cores applied to the cables often need to be subjected to deformation processes such as bending, rotation, etc. to meet design and installation requirements. The copper core wire has the advantages that the surface microcracks are easily formed on the outer surface of the bending part of the copper core wire, the flatness is easily poor at the flattening part, and the like, so that the service life is influenced, and the heat dissipation, the corrosion resistance and the like of the core wire are also adversely affected, so that the copper core wire is a technical problem to be solved in the copper core wire processing industry. Disclosure of Invention Based on the above, it is necessary to provide a continuous extrusion processing technology of rare earth Y modified oxygen-free copper, aiming at the technical problems of improving the conductivity, corrosion resistance and the like of copper materials. A continuous extrusion process for preparing rare-earth Y-modified oxygen-free copper includes such steps as smelting cathode copper and rare-earth elements in argon atmosphere, homogenizing annealing, cold rolling at 500 deg.C, continuous extrusion, water cooling quenching and annealing for 0.5 hr at 500 deg.C, and finishing copper to preset size. Further, a continuous extrusion processing technology of rare earth Y modified oxygen-free copper comprises the following steps: S1, raw material preparation: a. preparing materials, namely taking 99.99 percent of cathode