发动机箱体关键工序切削仿真及参数优化

Study on Machining Simulation and Cutting Parameters Optimization about Key Process of Engine Box

材料不同的特性会导致加工过程中2个零件的切削力、切削温度以及切削变形不同,从而影响同轴度,因此,选择合理的切削参数是关键。针对某型号发动机,为了优化其切削参数,结合镗瓦孔工序加工要求和工艺特点,建立了镗瓦孔工序的切削力模型和切削温度的经验公式。以弹塑性有限元理论为基础,建立了基于镗瓦孔工序中2种材料的三维镗削模型,应用Deform-3D有限元软件,完成了2种材料镗削过程的切削仿真,获得了材料的应力应变分布、切削力切削变形曲线和工件温度场分布及变化曲线,通过对比分析,得到了合理的切削参数。提出了镗瓦孔工序中切削参数的优化方案,仿真结果证明了该方案的正确性。

Different material property causes the different cutting force, cutting temperature and cutting deformation and this could affect concentricity. Therefore, a reasonable choice of cutting parameters is very important. Combined with the processing requirement and characteristic of the main bearing bores boring process. Base on the elastic-plastic finite element theory, establish the 3D model of the two parts. Applying Deform-3D finite element software completes the cutting simula tion of the two different material. Obtain the stress distribution, strain distribution, cutting force curve, work piece deform ation curve and temperature distribution curve of the two material. Through the comparative analysis, identify the impact on processing accuracy of the different material. The variation law of cutting force, feed temperature and cutting temperature under different cutting speed, cutting depth and feed rate are obtained by simulation. Finally, a cutting parameters optimiza- tion program of boring main bearing bore is proposed.