基于多体理论模型的加工中心热误差补偿技术

基于多体系统理论,建立了数控加工中心热误差模型,并提出其误差补偿方法,以三坐标MAKINO加工中心为例,建立了具体模型并进行参数辨识,优选了4个测温点,实时测量其温度,作为误差参数辨识模型的输入值,实现了软件实时补偿,在该加工中心上分别沿3个坐标方向加工一系列表面并比较加入热误差补偿的结果,测量结果表明补偿效果显著,实践说明本文所建热误差模型的有效性和补偿方法的可行性.

A MBS-Based Technique for Compensating Thermal Errors in Machining Centers

Based on MBS(Multi body System Theory),an error model was presented here for the thermal errors in machining centers as well as the related compensation method. Taking three axis MAKINO machining center as an example, a specific error model was set up through theoretically analyzing and experimentally parameter identifying. Four temperature sensors were sctected after optimization,and the temperature changes from their readings offered as the inputs to the error parameter models. Then a real time software software compensation was carried out, a set of small surfaces were out on the machining center along the x.y and z axis with and without error compensation. The measurement results from CMM showed an obvious improvement was obtained after the real time compensation,Thus the facts above verified the validity and fcasibility of this error model and compensation method.