磨粒流, 约束模块, 湍流, 光整加工

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The structural surfaces are not easy to be finished by polishing tools. A new method of precision finishing based on low viscosity liquid-solid two-phase abrasive flow was provided. With this method, flow passage was constructed by restraining modular block and structural surfaces to be machined. Liquid-solid two-phase abrasive flow was made by mixing low viscosity liquid with micro abrasive particles according to a definite volume fraction. When the turbulent abrasive flow passed through the constructed flow passages, the surface of flow passage will be finished gradually by frequent action of micro force and micro-scale machining of the abrasive particles. Disordering of the surface machining vein was easy to be realized under the condition of abrasive flow turbulence, which can improve surface quality. Therefore, contrast researches of pressure, velocity and turbulent kinetic energy of abrasive flow in the flow passage constructed by restraining modular blocks before and after optimization were carried out. The conclusion is that uniform turbulence is easy to be formed after the restraining modular block is optimized. Finishing experiments were carried out on a self-made low viscosity liquid-solid two-phase abrasive flow machining equipment. The experimental results indicate that the uniform surface roughness is obtained after the restraining modular block is optimized. And the surface roughness value reduces from Ra=93.28nm to Ra=42.78nm after 50 hours’ finishing, which proves the feasibility and effectiveness of this method.

abrasive flow, restraining modular block, turbulence, finishing