环境温度影响下并联机床的加工误差解耦

Machining Error Decoupling of Parallel Machine Tool under the Influence of Ambient Temperature

为了反映环境温度对并联机床加工误差的影响,对将单一因素造成的误差从综合误差中分离出来的解耦方法进行了研究。采用闭环矢量法建立并联机床的运动学反解方程,基于该方程,通过优化的方法建立误差模型,仿真得到了环境温度对并联机床加工误差的影响;然后,仅改变环境温度这一因素完成了一组对比试验,通过比较求差法对该误差进行了解耦验证。研究表明,环境温度变化对并联机床的加工误差存在影响,且该误差随着刀轨半径的增大而增大。

To reflect the influence of ambient temperature on the machining error of parallel machine tool, the paper studied the decoupling method of separating the error caused by single factor from composite error. The kinematics equation was established using closed-loop vector method. Based on the equation, an error model of parallel machine tool was set up by optimization algorithm. The effect of environmental temperature on the machining error of parallel machine tool was acquired by simulation. Then, we made a contrast test by only changing the factor of ambient temperature. The error was decoupled through test method. Research shows that ambient temperature has an effect on parallel machine tool＇ s machining error. And, the error increases with the enlarging of tool path radius.