高速钻攻中心Z轴热变形的在线测量与补偿技术

On-line Measurement and Compensation Method of Thermal Deformation for High-speed Drilling Center

在高速钻攻中心的3C产品加工过程中,机床体积小数量多,生产节奏快,热变形量大,因此一种快速测量热变形的方法显得尤为重要。针对此问题,文章提出了一种Z轴热变形的在线测量与补偿技术,首先利用对刀仪来测量Z轴的热变形量,然后通过分段线性拟合的方法建立了一种热误差补偿模型,最后验证了该模型的补偿效果。结果表明,在相同测量精度的情况下,该方法的测量时间缩短到2h,大大提高了热变形的测量速度。将该技术运用到小型数控机床的热误差补偿中,加工精度能够满足生产要求。

In the process of the 3C product of the high speed drilling center,the machine is small in size and large in quantity,the production speed is fast,and the thermal deformation is large. So it is very important to measure the thermal deformation quickly. To solve this problem,this paper proposed an on-line measurement and compensation method for Z-axis thermal deformation. Firstly using tool setting gauge to measure the Z axis thermal deformation,and then through the piecewise linear fitting to establish a thermal error compensation model,finally verify the compensation effect of the model. The results showthat under the same measurement accuracy,the measurement time is shortened to 2 hours,and the measurement speed of thermal deformation is greatly improved. The technology can be applied to the thermal error compensation of small CNC machine tools,and the processing accuracy can meet the production requirements.