热源参数对切削性能影响的有限元分析

Finite Element Analysis of the Influence of Heat Source Parameters on Cutting Performance

从工件塑性变形和刀具与工件摩擦的角度出发,分析了切削仿真过程中热量的来源,分别针对不考虑切削热、只考虑塑性热、只考虑摩擦热、同时考虑塑性热及摩擦热四种工况,研究了切削仿真过程中的切削力、切削温度、工件应力和应变以及能量的变化规律,并对不同工况下的仿真效率进行了对比分析。结果表明:在热源参数的软化作用下,切削力和工件应力都会降低,而应变会略有增加;摩擦热源参数对切削力、工件应力的贡献度相对较大,而塑性热源参数对切削温度的贡献较大;考虑切削热的仿真效率要远远低于不考虑切削热的情况,并且摩擦热源参数对仿真效率的影响要大于塑性热源参数。

The source of heat during cutting simulation was analyzed from the perspective of plastic deformation from workpiece and friction between cutting tool and workpiece. At the same time,the changing laws of cutting force,cutting temperature,workpiece stress and strain and energy in the process of cutting simulation were studied respectively in the following four cases,such as no cutting heat,only plastic heat,only friction heat,both plastic heat and frictional heat. Finally,the simulation efficiency under different conditions was compared and analyzed. The results show that under the softening action of heat source parameters,the cutting force and workpiece stress decrease,while the strain increases. Frictional heat source parameters contribute more to cutting force and workpiece stress,while plastic heat source parameters contribute more to cutting temperature. The simulation efficiency considering cutting heat is much lower than that no heat,and the influence of friction heat source parameters on the simulation efficiency is greater than plastic heat.