▎ 摘　　要

NOVELTY - Preparing fine-grained high-purity oxygen-free copper plate comprises (1) charging, cleaning the hearth of the electron beam cooling bed smelting furnace, covering the furnace cover, and vacuumizing, (2) staring the electron gun to start melting the material, and staring to pull down, (3) heating hot-pressed slab by gas furnace and keeping for 4-5 hours, and forging on 3150-ton hydraulic press, (4) heating hot rolling by gas furnace, hot rolling in separate passes on two-roll reversible rolling mill after holding the heat for 3-4 hours, (5) milling the milled hot-rolled billet up and down on the double-sided milling device, (6) cold rolling the above-mentioned medium and thick plate in separate passes on four-high reversing rolling mill, and (7) annealing the above-mentioned semi-finished sheet material for 1 hour, cleaning the surface to obtain the finished plate after the annealing treatment, and cutting according to the product shape and size. USE - The method is useful for preparing fine-grained high-purity oxygen-free copper plate. ADVANTAGE - The method: adopts electron beam cooling bed melting to remove inclusions in electrolytic copper; sets the power of each melting zone according to the process requirements; can reach purity of the prepared oxygen-free copper plate above 99.995%; has the oxygen content is less than 5 ppm, he grain size of the plate is less than 70 um, dense structure, and no air holes, inclusions and shrinkage porosity; can further remove the oxygen in the container; plays the role of isolating the copper liquid and oxygen; and improves the purity and heat resistance of the oxygen-free copper plate. DETAILED DESCRIPTION - Preparing fine-grained high-purity oxygen-free copper plate comprises (1) charging, cleaning the hearth of the electron beam cooling bed smelting furnace, cutting the electrolytic copper plate into specification of 1000×370×15, placing it into the horizontal feeder in the feeding bin, cleaning the observation window, covering the furnace cover, and vacuumizing, (2) staring the electron gun to start melting the material when the vacuum degree in the electron beam cooling bed furnace reaches 1×10-2torr, flowing the melt into the crystallizer through the cooling bed, completely covering the crystallizer pull head when the copper liquid flows into the crystallizer through the cooling bed and, and staring to pull down, (3) heating hot-pressed slab by gas furnace at heating temperature of 750-780℃ and keeping for 4-5 hours, and forging on 3150-ton hydraulic press, so that the final forging temperature is greater than 500℃, and the cross-sectional size of the billet is 605×100, (4) heating hot rolling by gas furnace at heating temperature of 750-780℃, hot rolling in separate passes on two-roll reversible rolling mill after holding the heat for 3-4 hours, so that the total reduction is 60-85%, (5) milling the milled hot-rolled billet up and down on the double-sided milling device, where the milling thickness is 1 mm to remove the scale on the surface of the billet after hot rolling, (6) cold rolling the above-mentioned medium and thick plate in separate passes on four-high reversing rolling mill, where the total deformation of the cold rolling is greater than 40%, and (7) annealing the above-mentioned semi-finished sheet material for 1 hour, controlling the temperature at 250-280℃, cleaning the surface to obtain the finished plate after the annealing treatment, and cutting according to the product shape and size.