Surface polishing method for 3D printing titanium alloy complex part

Abstract

The invention discloses a surface polishing method for a 3D printing titanium alloy complex part. The method comprises the following steps of adding alumina nano abrasive particles into a mixed electrolyte containing formamide, potassium chloride and deionized water, and uniformly stirring to obtain a polishing solution; adding a dodecyl trimethyl ammonium chloride active agent into the polishingsolution at the temperature of 40 DEG C, and enabling the aluminum oxide abrasive particles in the polishing solution to have positive charges; immersing a 3D printing titanium alloy test piece into astainless steel tank containing the polishing solution, connecting the 3D printing titanium alloy test piece with an anode, and connecting the stainless steel tank with a cathode; applying a pulse direct-current power supply between the cathode and the anode to generate discharge plasmas; and in the interpulse stage of a current waveform, applying ultrasonic oscillation with the frequency of 40-60 kHz to the polishing solution through an ultrasonic device at the bottom of a polishing tank, and polishing the 3D printing titanium alloy test piece for at least 15 min. According to the surface polishing method, effective polishing of the 3D printing titanium alloy wall face and a cavity is achieved through the comprehensive effect of anode electrochemical reaction, discharge plasma etching removal, ultrasonic cavitation and abrasive particle erosion.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to a surface polishing method for 3D printing titanium alloy complex parts. Background technique [0002] The traditional manufacture of titanium alloy parts mainly relies on casting and forging. Among them, casting parts are easy to manufacture in large sizes, but they are heavy and cannot be processed into fine shapes; although the precision is better after forging and cutting, the waste of titanium alloy materials is serious, and 95% of the raw materials will be cut off as waste. Moreover, both techniques are difficult to manufacture complex titanium alloy parts. 3D printing (three-dimensional additive manufacturing) titanium alloy technology has better solved the problems of casting and forging. It uses high-energy beams such as laser beams and electron beams as heat sources to heat titanium alloy materials to combine them, and it is an advanced method...

AI Technical Summary

Problems solved by technology

[0006] However, pure electrolytic plasma polishing has certain limitations. For example, in order to prevent the electrolytic plasma from "micro-discharge" to "arc discharge" from damaging the titanium alloy substrate, it is often required to input as little energy as possible, which will lead to discharge Plasma polishing of anodic oxide is not thorough enough

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