强约束磨粒射流抛光过程仿真与实验

Simulations and experiments for strongly constrained abrasive jet polishing

针对射流抛光的射流束发散与冲击的问题,提出强约束磨粒射流抛光方法。该方法通过抛光工具头强制约束原本松散的磨粒流沿工件表面切向高速流出。形成一种"表面射流",达到抛光加工的目的。建立了强约束磨粒射流抛光过程的仿真模型。仿真与PIV实验结果表明,该方法有确定的材料去除模型。通过数控编程与误差补偿可达到确定性抛光的目的。与传统磨粒射流抛光相比,大大提高了对能量的利用效率和工件表面质量。针对典型的硬脆材料石英玻璃进行了抛光实验,实验结果表明该方法主要利用磨粒流的剪切作用达到抛光的目的,抛光效率高,抛光质量好。

In view of the jet divergence and impingement problems of jet polishing,a strongly constrained abrasive jet polishing method is proposed.In this method,originally loose abrasive flows are constrained through the polishing tool to flow out at high speeds along the tangential direction of the surface of workpieces and form 'surface jets' so as to achieve the purpose of polishing.A simulation model for strongly constrained abrasive jet polishing is established.The simulation and the result of the PIV(particle image velocimetry) experiment show that this method has a determined material removal model and can realize deterministic polishing through numerical control programming and error compensation.A polishing experiment is conducted on the typical hard and brittle material quartz glass.The result of the experiment shows that this method mainly realizes polishing using the shearing effect of abrasive flows,with high polishing efficiency and good polishing quality.