Accuracy is one of the most important key indices to evaluate multi-axis systems’ (MAS’s) characteristics and performances. The accuracy of MAS’s such as machine tools, measuring machines and robots is adversely af...Accuracy is one of the most important key indices to evaluate multi-axis systems’ (MAS’s) characteristics and performances. The accuracy of MAS’s such as machine tools, measuring machines and robots is adversely affected by various error sources, including geometric imperfections, thermal deformations, load effects, and dynamic disturbances. The increasing demand for higher dimensional accuracy in various industrial applications has created the need to develop cost-effective methods for enhancing the overall performance of these mechanisms. Improving the accuracy of a MAS by upgrading the physical structure would lead to an exponential increase in manufacturing costs without totally eliminating geometrical deviations and thermal deformations of MAS components. Hence, the idea of reducing MAS’s error by a software-based alternative approach to provide real-time prediction and correction of geometric and thermally induced errors is considered a strategic step toward achieving the full potential of the MAS. This paper presents a structured approach designed to improve the accuracy of Cartesian MAS’s through software error compensation. Four steps are required to develop and implement this approach: (i) measurement of error components using a multidimensional laser interferometer system, (ii) tridimensional volumetric error mapping using rigid body kinematics, (iii) volumetric error prediction via an artificial neural network model, and finally (iv) implementation of the on-line error compensation. An illustrative example using a bridge type coordinate measuring machine is presented.展开更多
在工程实际维修过程中,针对备件短缺的常见问题,以FANUC Oi Mate-TB的数控车床维修滚珠丝杠为研究对象,结合工厂实际采用修配法更换不同螺距、不同螺旋旋向和不同长度尺寸的滚珠丝杠,并设定了轴旋转方向、柔性齿轮比参数和采用锁紧式联...在工程实际维修过程中,针对备件短缺的常见问题,以FANUC Oi Mate-TB的数控车床维修滚珠丝杠为研究对象,结合工厂实际采用修配法更换不同螺距、不同螺旋旋向和不同长度尺寸的滚珠丝杠,并设定了轴旋转方向、柔性齿轮比参数和采用锁紧式联结轴套加长轴的长度至满足要求。采用XL-80型激光干涉仪检测了机床X/Z轴反向间隙、螺距补偿、定位精度和重复定位精度,并导入分析得到的数据补偿值至机床。经试车,机床精度符合要求,验证了该方法的可靠性和有效性,解决了工程实际维修过程中备件短缺的常见问题。展开更多
文摘Accuracy is one of the most important key indices to evaluate multi-axis systems’ (MAS’s) characteristics and performances. The accuracy of MAS’s such as machine tools, measuring machines and robots is adversely affected by various error sources, including geometric imperfections, thermal deformations, load effects, and dynamic disturbances. The increasing demand for higher dimensional accuracy in various industrial applications has created the need to develop cost-effective methods for enhancing the overall performance of these mechanisms. Improving the accuracy of a MAS by upgrading the physical structure would lead to an exponential increase in manufacturing costs without totally eliminating geometrical deviations and thermal deformations of MAS components. Hence, the idea of reducing MAS’s error by a software-based alternative approach to provide real-time prediction and correction of geometric and thermally induced errors is considered a strategic step toward achieving the full potential of the MAS. This paper presents a structured approach designed to improve the accuracy of Cartesian MAS’s through software error compensation. Four steps are required to develop and implement this approach: (i) measurement of error components using a multidimensional laser interferometer system, (ii) tridimensional volumetric error mapping using rigid body kinematics, (iii) volumetric error prediction via an artificial neural network model, and finally (iv) implementation of the on-line error compensation. An illustrative example using a bridge type coordinate measuring machine is presented.
文摘在工程实际维修过程中,针对备件短缺的常见问题,以FANUC Oi Mate-TB的数控车床维修滚珠丝杠为研究对象,结合工厂实际采用修配法更换不同螺距、不同螺旋旋向和不同长度尺寸的滚珠丝杠,并设定了轴旋转方向、柔性齿轮比参数和采用锁紧式联结轴套加长轴的长度至满足要求。采用XL-80型激光干涉仪检测了机床X/Z轴反向间隙、螺距补偿、定位精度和重复定位精度,并导入分析得到的数据补偿值至机床。经试车,机床精度符合要求,验证了该方法的可靠性和有效性,解决了工程实际维修过程中备件短缺的常见问题。
