多晶材料的微铣削建模与实验研究

Modeling and Experimental Study on Micro-milling Polycrystalline Material

对微铣削多晶材料的加工机理进行了详细分析,建立了相应的加工过程模型.重点考虑了最小切屑厚度和材料金相组织的作用,并对微铣削力和加工表面生成的影响因素进行了细致分析.分析发现多晶材料不同的晶粒特性会导致生成表面产生波动,并致使切削力产生附加振动.最小切屑厚度将决定刀具对晶粒是否进行材料去除,并使切削过程产生高频波动.大量的实验研究表明,模型准确地预测了微铣削现象,对优化加工参数、提高生产效率和加工质量提供了理论基础.

Through the detailed analysis of the machining mechanism of micro-milling polycrystalline materials, a micro-milling model is developed, where the effects of minimum chip thickness and metal phase on the mechanism are focused on. Also, how they affect the micro- milling force and surface generation are discussed in detail. It is found that the difference between grains results in the surface fluctuation and additional vibration to the cutting force. Whether the grain is cut or not by the tool depends on its minimum chip thickness, which also causes the high frequency vibration during machining. Through many experimental studies, the results revealed that the model we developed is able to predict the micro-milling process, which provides theoretical supports to optimize micro-milling parameters so as to improve the efficiency and quality of products.