Method for preparing high-accuracy titanium and titanium alloy bars

Abstract

The invention provides a method for preparing high-accuracy titanium and titanium alloy bars. The method comprises the steps of preparing a blank, blanking, cogging and forging, performing deformation processing, annealing, hot straightening, turning, finishing, and inspecting a finished product and packing. According to the method, the bars are turned before finishing treatment, the diameter of the bars can be directly processed into the size of finished bars, sweeps generated by turning the bars can be recycled, and the economic value is high; the heating temperature is low during finishing treatment, metallographic structures of the bars are influenced a little and nearly not changed, the service life of the bars is prolonged, and the mechanical strength of the bars is enhanced; meanwhile, because the heating temperature is low during finishing treatment, oxide skins on the surfaces of the bars are very thin, the indentations of the integral bars are small in the straightening process, the bars are not required to be ground after straightening, directly enters a polishing machine and are polished twice to meet the requirements of the finished bars on roughness 1.6[mu]m and size tolerance.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a method for preparing high-precision titanium and titanium alloy rods. Background technique [0002] The existing method of preparing medical titanium alloy rods generally adopts the stress-relief straightening method during finishing treatment. When turning before finishing treatment, the bar needs to leave a minimum margin of 30-40 wires, and this method The temperature of the bar is high when heating. Generally, the pure titanium bar needs to be heated to 550-600°C, and the titanium alloy bar needs to be heated to 650-700°C. The whole becomes soft, and the overall indentation of the bar during straightening is deep, and the minimum value will reach 10 wires. These unfavorable factors cannot be eliminated by polishing alone, so these unfavorable factors must be eliminated by grinding, and the roughness of grinding can reach 6.4 um, it must be pol...

AI Technical Summary

Problems solved by technology

[0002] The existing method of preparing medical titanium alloy rods generally adopts the stress-relief straightening method during finishing treatment. When turning before finishing treatment, the bar needs to leave a minimum margin of 30-40 wires, and this method The temperature of the bar is high when heating. Generally, the pure titanium bar needs to be heated to 550-600°C, and the titanium alloy bar needs to be heated to 650-700°C. The whole becomes soft, and the overall indentation of the bar during straightening is deep, and the minimum value will reach 10 wires. These unfavorable factors cannot be eliminated by polishing alone, so these unfavorable factors must be eliminated by grinding, and the roughness of grinding can reach 6.4 um, it must be polished twice to meet the requirements of the finished bar, and the grinding process is labor-intensive and time-consuming, and the abrasive debris generated is mixed with sand particles, and the recovery value is low, so it is necessary to improve