CAJ | 학술논문

并联机床在标定时所建立的位置参考系与运动参考系不一致产生系统误差,从而影响机床的结构性能。通过改进标定建模方式,将两个参考系统一,并用数值模拟该并联机床的标定过程,对比结果发现,改进后的模型可以完全消除测量时的系统误差对并联机床标定精度的影响。把标定过的模型导入ADAMS进行振动仿真分析,通过对比可以发现标定过模型的各项振动指标明显优于未标定的模型,从而进一步提高并联机床的结构性能。直接提高机械加工精度及安装精度能够提高并联机床的结构参数的精度,但其代价将是极大地增加加工成本,采用运动学标定并联机床的运动学建模的方法则只需要按普通精度要求进行机械加工,这种标定建模方式具有很高的实用价值。
병련궤상재표정시소건립적위치삼고계여운동삼고계불일치산생계통오차,종이영향궤상적결구성능。통과개진표정건모방식,장량개삼고계통일,병용수치모의해병련궤상적표정과정,대비결과발현,개진후적모형가이완전소제측량시적계통오차대병련궤상표정정도적영향。파표정과적모형도입ADAMS진행진동방진분석,통과대비가이발현표정과모형적각항진동지표명현우우미표정적모형,종이진일보제고병련궤상적결구성능。직접제고궤계가공정도급안장정도능구제고병련궤상적결구삼수적정도,단기대개장시겁대지증가가공성본,채용운동학표정병련궤상적운동학건모적방법칙지수요안보통정도요구진행궤계가공,저충표정건모방식구유흔고적실용개치。
The systematic errors,which were produced by the inconsistency of the position reference system with the motion reference system of the parallel machine tool in the calibration,could affect the structural performances of the machine.Both reference systems were unified by improving the calibration modeling approach and the calibration process of the parallel machine tool was numerically simulated.Contrast results found that improved models could completely eliminate the influences of systematic errors on the calibration accuracy of the parallel machine tool during the measurement.By importing the calibrated model into ADAMS for vibration aanalysis and comparing the vibration parameters,the calibrated model was found to obviously superior over the uncalibrated model,which could help further enhance the structural performances of the parallel machine tool.The structure parameter accuracy of the parallel machine tool can be directly improved with the improving machining accuracy and mounting accuracy,but the processing costs will be greatly increased.Kinematic calibration of parallel machine tool by kinematics modeling method only requires ordinary precision machining according to ordinary precision requirements.This calibration modeling method has high practical value.