Preparation method of medical high-precision titanium and titanium alloy bar material

Abstract

The invention discloses a preparation method of a medical high-precision titanium and titanium alloy bar material. The preparation method comprises the following steps of: preparing a blank, discharging, forging in a cogging way, a machining in a deformation way, annealing, thermally straightening, turning, carrying out low-temperature precision straightening, polishing twice, and packing an inspected finished product. The preparation method has the beneficial effects that when the bar material is turned before being finely machined, the diameter of the bar material can be directly machined into the size of a finished bar material, so that the waste dregs generated when the bar material is turned can be recycled, and the preparation method is very high in economic value; the heating temperature is lower when the bar material is processed in a finishing way, so that the preparation method hardly influences or change the metallographic structure of the bar material, the service life of the bar material can be prolonged, and the mechanical strength of the bar material can be increased; and when the bar material is processed in a finishing way, the heating temperature is lower, an oxide skin on the surface of the bar material is extremely thin, and the whole bar material has few indentations when straightened, after being straightened the bar material is polished twice by a polisher without being ground to reach the requirements of a finished bar material on roughness (1.6 mu m) and dimensional tolerance.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a preparation method of medical high-precision titanium and titanium alloy bars. Background technique [0002] In the preparation method of the existing medical titanium alloy bar, the stress-relieving straightening method is generally used in the finishing treatment. When turning the bar before the finishing treatment, a minimum allowance of 0.30mm-0.40mm is required for the bar, and this method is adopted. When the method is heated, the temperature of the bar is relatively high. Generally, the pure titanium bar needs to be heated to 550℃-600℃, and the titanium alloy bar needs to be heated to 650℃-700℃. Under such high temperature conditions, the oxide scale on the surface of the bar is relatively high. Thick, the material becomes soft as a whole, and the overall indentation of the bar is deep when straightening, and the minimum value will reach 0.1...

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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 the rods before finishing treatment, a minimum margin of 0.30mm-0.40mm should be left, and this The temperature of the bar is relatively high during heating. Generally, the pure titanium bar needs to be heated to 550°C-600°C, and the titanium alloy bar needs to be heated to 650-700°C. Thick, the material becomes soft as a whole, the overall indentation of the bar is deeper when straightening, and the minimum value will reach 0.10mm, and these unfavorable factors cannot be eliminated by polishing alone, so these unfavorable factors must be eliminated by grinding, and the grinding process is rough The thickness reaches 6.4um, and it must be polished twice to meet the requirements of the finished bar. Moreover, the grinding process is labor-intensive and time-consuming, and the abrasive debris produced is mixed with sand particles, and the recovery value is low. Therefore, it is necessary to improve the preparation method.