Abstract: To improve high speed machining quality, a connection performance evaluation model for spindle/toolholder system was built by using contact finite element method. Contact detection of all Gaussian integration points was implemented at the contact elements. Contact state was determined by calculating normal distance and normal contact force between every two points on the contact surface; friction state was determined by calculating tangential contact force. The determinations of inequality were introduced into variational principle of nonlinearity Finite Element Method (FEM) by penalty function, and the updated equations were solved by full Newton-Raphson method. The influences of broach force and rotation speed were calculated and compared by statistical deformation and stress analysis of contact faces.

Key words: spindle/toolholder system, connection performance, contact, finite element analysis, high speed machining

摘要： 为提高高速加工的质量，采用有限元接触理论建立了刀柄—主轴系统的联结性能评测模型。对接触面上所有高斯积分点进行接触判定。计算任意两点间的法向距离和法向接触力，以判断是否进入接触状态；计算切向接触力以判断摩擦状态。用罚函数法将不等式形式的判定条件引入非线性有限元变分原理，采用完全Newton-Raphson方法求解方程组。采用该模型仿真刀柄—主轴接触面的变形状况和应力分布，并用统计方法分析了拉刀力和转速对刀柄—主轴系统联结性能的影响规律。

关键词: 刀柄—主轴系统, 联结性能, 接触, 有限元分析