刀具磨损对TC11铣削表面粗糙度与残余应力的影响

Effect of Tool Wear on Milling Surface Roughness and Surface Residual Stress of TC11

为了研究TC11钛合金铣削加工过程中刀具磨损对加工表面质量的影响规律,设计了刀具磨损与铣削表面粗糙度、表面残余应力的试验。结果表明:TC11钛合金铣削加工过程中的刀具磨损可以分为:初期磨损、正常磨损、剧烈磨损三个阶段。当刀具处于“初期磨损”时,TC11铣削表面粗糙度随切削时间逐渐减小,铣削表面残余应力也呈减小趋势;当刀具处于“正常磨损”阶段时,铣削表面粗糙度和铣削表面残余应力都呈增加趋势,但增加的速度平稳;当刀具进入“剧烈磨损”阶段时,铣削表面粗糙度迅速增大,表面残余应力也较前两个阶段显著增加。另外,试验过程中的TC11铣削表面残余应力均表现为压应力。

In order to study the influence of the tool wear on the surface quality of the TC11 in the milling process,the experiment between the tool wear and the milling surface roughness and the surface residual stress was designed. The results show that the tool wear in the milling process of the TC11 can be divided into three stages:the initial wear,the normal wear and the severe wear. When the tool is in“ the initial wear”,the surface roughness of the TC11 decreases gradually with the cutting time,and the residual stress of the milling surface also decreases. When the tool is in“ the normal wear”,both the milling surface roughness and the surface residual stress increase,but the increasing rate is stable. When the tool is in“ the severe wear”,the surface roughness increases rapidly,and the surface residual stress increases significantly compared with the previous two stages. In addition,the surface residual stress of the TC11 during the test process are all in compressive stress.