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环境温度对数控机床直线运动轴位置偏差的影响

发布时间:2018-02-14 15:55

  本文关键词: 位置偏差预测模型 环境温度 直线运动轴 半闭环 全闭环 出处:《天津大学学报(自然科学与工程技术版)》2017年06期  论文类型:期刊论文


【摘要】:机床使用时环境温度的变化,造成补偿后的定位精度变差."固定-支撑"的丝杠安装方式下热误差呈线性规律,据此建立了半闭环直线运动轴位置偏差随环境温度变化的预测模型.测试了半闭环控制运动轴在最高、最低两种环境温度下的位置偏差,拟合得到热误差随环境温度变化的规律.利用位置偏差预测结果,对螺距误差进一步补偿.结果表明:对于半闭环控制的滚珠丝杠进给系统,当环境温升8,℃时,位置偏差最大值由8mm增大到72mm,补偿后降为9.9mm,降低了96.87%,;对于全闭环控制的滚珠丝杠进给系统,当环境温升8℃时,位置偏差由2.5mm增大到17.7mm.根据本文所建立的模型进行补偿,可以提高定位精度的热稳定性,并且当环境温升大于6℃时,利用温度补偿的半闭环控制下定位精度大于全闭环控制下的定位精度.
[Abstract]:When the machine tool is in use, the change of ambient temperature causes the positioning accuracy to become worse after compensation. The thermal error of the "fixed support" lead screw installation mode is linear. Based on this, a prediction model of the position deviation of semi-closed loop linear motion axis with ambient temperature is established, and the position deviation of semi-closed loop control axis under the highest and lowest ambient temperatures is tested. The variation of thermal error with ambient temperature is obtained by fitting. The pitch error is further compensated by using the prediction result of position deviation. The results show that for the ball screw feed system controlled by semi-closed loop, when the ambient temperature rises at 8 鈩,

本文编号:1511064

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