基于有限元的柴油机机体孔系镗削工艺参数优化

Parameter optimization of hole boring process of diesel engine body based on finite element analysis

柴油机机体属于薄壁框架类零件,结构复杂,其孔系位置精度要求高,加工变形问题严重.以某型柴油机机体曲轴孔镗削加工工艺为例,基于有限元法和正交试验设计,优化分析切削速度、切削深度、进给速度等参数对机体孔系变形的影响;利用均值方差法对正交试验结果进行处理,从而确定优化的镗削加工工艺参数组合为切削速度133. 136 m/min,切削深度0. 1 mm,进给速度20 mm/min.经过验证,优化后的试验方案最大变形量减小了20. 5%,证明该方法的可行性及有效性.

As a part of the framework parts with complex structure,diesel engine body hole has high position accuracy and serious problems of the machining deformation.Taking a kind of diesel engine body as an example,studies on boring machining parameters optimization of curved shaft hole of the body and analysis the deformation effect of cutting speed,cutting depth,feed speed and other parameters are carried out based on the finite element method and orthogonal experimental design.Using the method of variance with the result of orthogonal experiment,we determined the cutting speed to be 133.136m/min,cutting depth to be 0.1mm and feed speed to be 20 mm/min,and the result shows that the optimized maximum deformation decreases by 20.5%,which proves the feasibility and effectiveness of the method.