结合机床测头的城轨车体底架覆盖测量优化方法

Optimization Method for Underframe Coverage Measurement for Urban Rail Vehicle Body Combined with Machine Tool Probe

为进一步提高当前数控机床对城轨车体底架装夹误差的测量效率及精度,利用英国雷尼绍公司研发的高精度RMP60机床测头,以最小化机床测头的补偿点数量为目标,分别提出了基于分组规划法与动态规划法的城轨车体底架覆盖测量方法,给出了覆盖测量方法的步骤,实现了底架上滑槽点的全覆盖。仿真结果表明,在相同条件下,机床测头利用动态规划法完成对滑槽点全覆盖时所获得的补偿点数量比分组规划法缩减12.9%,且重叠率降低4.47%,所以本文所提方法能够有效提升机床对城轨车体底架滑槽的测量效率及精度。

In order to further improve the measuring efficiency and accuracy of the clamping error of the underframe of the urban rail vehicle body by using the current CNC machine tools,the high precision RMP60 machine tool probe is developed with Renishaw Company in England in order to minimize the number of compensation points of machine tool probe,and the underframe coverage measurement method of urban rail vehicle body is put forward based on the grouping programming method and dynamic programming method respectively,and the steps of coverage measurement method are given,and the full coverage of chute points on the underframe is realized.The simulation results show that under the same conditions,when the dynamic programming method is used to cover the chute points,the number of compensation points obtained by using the machine tool probe is 12.9%less than that by using the group programming method,and the overlap rate is reduced by 4.47%.Therefore,the present method can effectively improve the measurement efficiency and accuracy of the machine tool to the bottom frame chute of the urban rail vehicle.