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以六自由度6-TPS型并联机床为模型,分析了工件坐标系定位对刀具加工范围和运动精度的影响,并据此将工件坐标系定位归结为一类兼顾作业空间和运动精度的有约束非线性规划问题。基于求解非线性规划的复合形法,提出并开发了工件坐标系定位算法,并给出具体的算法流程。这种方法包括确定初始定位矢量、构造定位矢量的初始复合形、建立目标函数和优化计算4部分。最后,针对一组给定的刀位文件,利用上述方法进行了机床的定位规划和计算,验证了算法的合理性和实用性。
Taking the 6-DOF 6-TPS parallel machine tool as a model, the influence of the workpiece coordinate system positioning on the machining range and the movement accuracy is analyzed. Based on this, the workpiece coordinate system positioning is reduced to a kind of constraint that takes into account both the work space and the movement accuracy Nonlinear programming problems. Based on the complex shape method for solving nonlinear programming, a new algorithm for locating the workpiece coordinate system is proposed and developed. The algorithm flow is given. This method includes determining the initial positioning vector, constructing the initial complex shape of the positioning vector, establishing the objective function and optimizing the calculation of 4 parts. Finally, for a given set of tool position files, the positioning and calculation of the machine tool are carried out by using the above method, which proves the rationality and practicability of the algorithm.