夹具对箱体加工变形影响研究

以某发动机箱体结合面的铣削工序为研究对象,采用有限元法模拟分析了夹具布局和夹紧力对箱体加工精度的影响。首先建立了箱体铣削力模型,计算了铣削力。箱体加工采用3-2-1定位方式,在夹紧力相同的条件下,改变夹紧的位置,采用有限元法,计算和分析了夹具布局对箱体加工变形的影响,从而确定了箱体铣削加工中夹具的位置。在此基础上,仿真分析不同夹紧力下箱体的加工变形。研究结果为发动机箱体加工中夹具布局和夹紧力确定提供了参考。

Impact of Fixture on Machining Deformation of Engine Case

A milling surface of an engine case is regarded as an example.The impact of the fix ture layout and the clamping force on the case machining precision are respectively analysed with the method of finite element.Firstly,a milling force model of the case is established,and the milling force is calculated.Using 3-2-1 positioning mode,in the case of the same clamping force,the ma chining deformations of the case are analysed under different fixture layouts with the method of finite element.According to the calculation data,the locating points of fixtures are determined.Based on the results,the machining deformations are simulated and analysed under different clamping forces.The research results can be refered to the fixture design of engine case.