The thermal induced errors can account for as much as 70% of the dimensional errors on a workpiece. Accurate modeling of errors is an essential part of error compensation. Base on analyzing the existing approaches of ...The thermal induced errors can account for as much as 70% of the dimensional errors on a workpiece. Accurate modeling of errors is an essential part of error compensation. Base on analyzing the existing approaches of the thermal error modeling for machine tools, a new approach of regression orthogonal design is proposed, which combines the statistic theory with machine structures, surrounding condition, engineering judgements, and experience in modeling. A whole computation and analysis procedure is given. Therefore, the model got from this method are more robust and practical than those got from the present method that depends on the modeling data completely. At last more than 100 applications of CNC turning center with only one thermal error model are given. The cutting diameter variation reduces from more than 35 μm to about 12 μm with the orthogonal regression modeling and compensation of thermal error.展开更多
五轴机床的旋转刀具中心点(rotational tool center point, RTCP)误差会极大地影响机床加工零件的精度,研究五轴机床的RTCP误差检测及补偿方法,对提升五轴机床的精度具有很重要的意义。为了解决现有的RTCP误差检测及补偿方法在精确性、...五轴机床的旋转刀具中心点(rotational tool center point, RTCP)误差会极大地影响机床加工零件的精度,研究五轴机床的RTCP误差检测及补偿方法,对提升五轴机床的精度具有很重要的意义。为了解决现有的RTCP误差检测及补偿方法在精确性、经济性、测量效率方面的有效平衡问题,提出一种基于自研装置的RTCP检测方法,能快速、简单、高效地补偿五轴联动机床回转中心的位置误差和角度误差。试验结果表明,该方法显著提升机床各方向上的RTCP精度,最高接近90%,具有较强的适用性。展开更多
RTCP(rotation tool centre point)检测方法是一种被广泛应用的五轴机床动态控制精度检测方法,目前针对RTCP检测的测量结果可视化方法对误差检测结果信息的展示完整度、误差图像特征明显程度等方面有进一步提升的空间,值得进一步研究改...RTCP(rotation tool centre point)检测方法是一种被广泛应用的五轴机床动态控制精度检测方法,目前针对RTCP检测的测量结果可视化方法对误差检测结果信息的展示完整度、误差图像特征明显程度等方面有进一步提升的空间,值得进一步研究改进。提出了一种新型误差检测结果可视化方法,将误差信息转化为极坐标形式,将误差数据进行极坐标网格化展示,能够更加充分地展示检测结果信息和图像特征,并通过应用示例论证了该方法的有效性、相对传统方法的优势、以及在误差溯源方面的应用潜力。目前,该方法已在ISO10791国际标准修订草案的会议讨论中获得应用,取得了良好的展示效果。展开更多
文摘The thermal induced errors can account for as much as 70% of the dimensional errors on a workpiece. Accurate modeling of errors is an essential part of error compensation. Base on analyzing the existing approaches of the thermal error modeling for machine tools, a new approach of regression orthogonal design is proposed, which combines the statistic theory with machine structures, surrounding condition, engineering judgements, and experience in modeling. A whole computation and analysis procedure is given. Therefore, the model got from this method are more robust and practical than those got from the present method that depends on the modeling data completely. At last more than 100 applications of CNC turning center with only one thermal error model are given. The cutting diameter variation reduces from more than 35 μm to about 12 μm with the orthogonal regression modeling and compensation of thermal error.
文摘五轴机床的旋转刀具中心点(rotational tool center point, RTCP)误差会极大地影响机床加工零件的精度,研究五轴机床的RTCP误差检测及补偿方法,对提升五轴机床的精度具有很重要的意义。为了解决现有的RTCP误差检测及补偿方法在精确性、经济性、测量效率方面的有效平衡问题,提出一种基于自研装置的RTCP检测方法,能快速、简单、高效地补偿五轴联动机床回转中心的位置误差和角度误差。试验结果表明,该方法显著提升机床各方向上的RTCP精度,最高接近90%,具有较强的适用性。
文摘RTCP(rotation tool centre point)检测方法是一种被广泛应用的五轴机床动态控制精度检测方法,目前针对RTCP检测的测量结果可视化方法对误差检测结果信息的展示完整度、误差图像特征明显程度等方面有进一步提升的空间,值得进一步研究改进。提出了一种新型误差检测结果可视化方法,将误差信息转化为极坐标形式,将误差数据进行极坐标网格化展示,能够更加充分地展示检测结果信息和图像特征,并通过应用示例论证了该方法的有效性、相对传统方法的优势、以及在误差溯源方面的应用潜力。目前,该方法已在ISO10791国际标准修订草案的会议讨论中获得应用,取得了良好的展示效果。
