微小薄壁变形预测的迭代有限元法

将迭代有限元法引入微小薄壁铣削中，建立了变形量的预测模型，预测了不同径向切削深度、不同薄壁厚度时的铣削变形量大小，通过试验加工和Deform-3D仿真对模型进行了验证.结果表明:迭代有限元变形预测值与试验加工变形量较为接近;加工后的薄壁残余厚度大于理想状况下的加工厚度;最大变形量随壁厚的增大先保持最大值然后逐渐减小至0;薄壁厚度应当与切削参数相协调，调整工件刚度与切削力大小相适应，否则会导致变形量过大.

Iterative Finite Element Method for Predicting Deformations of Micro Thin Wall

The iterative finite element method was introduced to the milling process of micro thin wall. A predicted model was established， and the milling deformations were predicted at different radial cutting depths and different thicknesses. The predicted model was validated by experiments and the Deform-3D simulation. The results showed that the deformation prediction value of the iterative finite element method is close to that of experimental machining. The residual thickness of the thin wall is greater than the thickness under the ideal conditions. The maximum deformation keeps maximal and then gradually reduces to 0 with increasing the wall thickness. The thickness of the thin wall should be coordinated with the cutting parameters in order to keep the adaptability between the stiffness and cutting force， otherwise it will lead to excessive deformation.