基于加工空间的并联数控机床参数优化

介绍了机床尺度综合的一般方法和尺度综合中参数设计的优化目标·结合机床的特点和机床设计的实际要求提出了一种新的机床尺度综合流程·给出了一种在机床的加工空间已定的前提下,以各驱动支链的长度最小为优化目标并使各铰链位置和虎克铰摆角在合理范围内以及各驱动支链的最大驱动速度和加速度及机构的灵巧性指标综合最小为条件的机床结构参数优化方法·当机床的加工空间为400mm×400mm×400mm的立方体空间,刀具的最大移动速度和加速度分别设定为0 5m/s和10m/s2时,用该方法对一种三杆并联数控机床的结构参数进行了优化设计,得到了3组较佳的参数·

Parameter Optimization Based on Workspace for a Parallel CNC Machine Tool

A general-purpose method of dimension integration and objective functions of parameter optimization during dimension integration are introduced. A new dimension integration flow is given combining the structural characteristics of machine tool with requirements for its design. A method of structural optimization is therefore given with a prerequisite of fixed workspace, of which the optimization aims at minimizing the length of every driving subchain so as to allow all the hinge positions and swing angles of Hooke's joints to be in a rational range and providing the conditions under which the smartnesses of the machine and the maximum actuating velocity and acceleration of all driving subchains can be minimized through integration process. With this method used, the structural parameters of a 3-chain parallel CNC machine tool are designed optimally with 3 sets of optimal parameters.