The preparation method of a large titanium cathode roll is to adopt a titanium thick plate roll. After welding, an intermediate frequency induction device is used to heat the weld and the heat-affected zone of the weld that needs to be heated. The heating temperature is between 750 and 980℃, and the heating time is 0.2 to 2 hours. The material deformation of the weld layer is 10-20%; The heat affected zone of the weld is heated and pressed for two to four times, recrystallization annealing is carried out, the heating temperature is 750 ~ 850℃, the holding time is 1-2 hours, and the furnace is cold. The invention can heat and recrystallize the cathode roll before rolling, and the heating temperature is controlled at a relatively low level, the deformation resistance is large, and the deformation occurs only in the surface layer and the thick grain cannot be refined.
The manufacturing method of titanium cathode roller and the composite high current cathode roller made of this material, the two ends of the titanium plate are heated and molded to form a certain height flange; The titanium plate is rolled into a cylinder so that the flange of the molded butt is welded to the joint; The weld is heated for forging, the forged weld is rolled, and finally the titanium cylinder is heat treated as a whole. The main shaft of the composite high-current cathode roller made of this material is located in the roller along the axis, and the roller is fixed connected with the main shaft through a conductive wheel and a copper conductive plate. The two ends of the roller are sealed by a plug plate. The roller is formed by an outer titanium cylinder and a steel-copper composite cylinder with an inner steel covering copper through hot loading. The height of the forged amount can be processed by the method of end molding, which is simple and feasible, and the folding phenomenon is not easy to be formed during forging. After forging, the welding seam structure can be further improved, and the titanium tube produced has low cost and high quality. The cathode roller made of this material can ensure the uniformity of conduction when the input current is high, and the roller surface is not overheated when the input current is 35000A, which improves the current density of the roll surface and the yield and quality of the foil, and prolongs the service life of the cathode roller.
The titanium cathode roller body is manufactured by first rolling the titanium plate into a cylinder and welding the joint; The weld and heat affected zone are heated, the temperature is controlled between 750 ~ 950℃, and the non-deformed substrate part is protected by cooling, and the weld is upset and forged flat; Then the weld and the heat-affected zone are heated, the temperature is controlled between 750 and 950℃, and the non-deformed substrate part is cooled and protected, and the weld is upset and then forged flat, repeated many times, so that the weld is deformed many times, and the deformation amount of each time should be more than 30%; For heat treatment of deformation, the temperature is controlled between 750 and 850℃. By deforming the casting structure, the casting structure is changed into an equiaxial structure that is basically the same as the substrate structure, thereby eliminating the periodic bright band printed by the weld structure on the foil.
