复杂工件夹紧力作用区域的规划算法

在机械加工过程中，工件受到切削力、切削扭矩等外载的作用，这将破坏工件定位时所获得的合理位置，甚至会导致生产事故的发生。因而必须对工件施加合理的夹紧力以保证其在整个加工过程中具有稳定性。为此，以工件稳定性为核心，提出了复杂形状工件的夹紧力作用区域确定算法。基于虚功原理和线性规划技术，建立了工件稳定性的判定算法；基于表面网格离散化方法，按照一定方向逐次分析各个节点处的工件稳定性，建立了夹紧力作用区域的确定算法。该方法不仅能够验证夹紧力大小的可行性，而且还能够用来指导夹紧力作用点位置的合理设计。

A Deterministic Algorithm for Acitve Region of Clamping Force of a Complex Workpiece

A workpiece is subjected to the cutting force and torques during machining.These external loads may result in the production accidents as well as the variation of workpiece position.The feasible clamping forces must be planned to stabilize the workpiece in the entire machining process.Therefore,a deterministic algorithm for the active region of clamping force of complex workpiece was proposed by taking the workpiece stability as a core.Firstly,according to the virtual work principle and the linear programming technology,a judgment algorithm was suggested for the stability analysis of workpiece.Secondly,on the basis of the surface mesh discretization method,a deterministic algorithm was further established to plan the active region of clamping force by analyzing the workpiece stability at all nodes in sequence.The proposed method can not only be utilized to verify the feasibility of the magnitude of clamping forces,but also determine the active region of clamping force.