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给出了内容式并联数控机床刀具活动空间的求法；确定了机床的运动限制条件和结构限制条件；描述了刀具活动空间的形态；分析了运动参数及结构参数对活动空间形态与体积的影响．
The method of determining the tool movement space of the parallel CNC machine tools is given. The motion limitation and structure restriction of the machine tool are determined. The shape of the tool movement space is described. The influence of the movement parameters and structure parameters on the shape and volume of the movement space is analyzed.