形状复杂零件的装夹参数确定算法

An Algorithm of Determining Fixturing Parameters for the Complex Workpiece

复杂型面零件的装夹是机械制造领域中的一个难点问题。零件装夹的确定依然取决于设计者或专家的经验与知识水平,难以满足日益增长的形状复杂零件的高精度加工要求。为此,首次系统地提出了一种装夹参数的确定算法。基于质点运动的速度合成原理和齐次线性方程组的解的性质,建立了定位正确性判定算法,以确定可行的定位点数目及其布局;基于静力平衡条件和齐次线性方程组的解的存在性,建立了零件加工稳定性分析模型及其算法,从而实现夹紧力大小、作用点、作用顺序的优选。该方法不仅能够验证夹具装夹方案的可行性,而且还能供装夹参数的合理设计时参考。

The fixturing for complex workpieces is a difficult problem in the mechanical manufacturing field.The determination of workpiece fixturing has still depended on the designer＇s experiences and expert＇s knowledge which is difficult in satisfying the high-precision machining requirement of the complex workpiece.Therefore,an algorithm to fixturing parameter determination was proposed for the first time.On the basis of the velocity composition law of a particle movement and solution characteristic of homogeneous linear equations,the approach to verify the locating correctness was established to figure out the feasible number and layout of locating points;in light of the static equilibrium condition and solution existence of homogeneous linear equations,the machining stability model and its solution technology were formulated to optimize the magnitude,placement and application sequence of clamping forces.In addition to the verification of the fixture feasibility,the proposed method can be used for the determination of fixturing parameters.