摘要
为减小机床的几何与热复合的定位误差,提出新的建模理论及补偿方法。分析丝杠受摩擦热源影响时的热膨胀,推导出丝杠瞬态温度数学表达式。对比介绍温升阶段丝杠冷却和冷却阶段丝杠再次温升时的丝杠瞬态温度计算方法。为解决丝杠温度不均匀分布的问题,细分丝杠,假定细分单元热均匀,并应用建立的丝杠瞬态温度数学表达式,对每个单元的温度进行求解。通过叠加各个单元的误差模型,可得到丝杠的综合误差模型。实验加工6个样件,用于验证模型的精度及误差补偿的有效性,结果表明补偿后样件的尺寸精度明显提高。
To decrease geometrical and thermally induced positioning errors of machine tools,a new modeling theory and compensation method are proposed.The theoretical thermal expansion of ball screw under the influence of the friction heat is analyzed and the mathematical expression of the transient temperature of the screw is deduced.The temperature calculating methods in the cases of cooling in the midway of warming up and warming up after cooling are introduced.To solve uneven distribution of temperature,the ball screw is divided into several evenly distributed units.And the established model can apply to each unit.The synthetic error model is established by superposition of all the unit models.In addition,six samples are machined to prove the accuracy of the model and the effectiveness of error compensation.The result shows that the dimensional accuracy of the samples after the compensation is obviously improved.
作者
冯文龙
南江红
杨建国
FENG Wenlong;NAN Jianghong;YANG Jianguo(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《上海航天》
CSCD
2018年第1期59-67,共9页
Aerospace Shanghai
基金
国家科技重大专项课题(2015ZX04005-001)
关键词
数控机床
丝杠传动系统
误差补偿
热特性分析
分段指数模型
机加工试验验证
numerical control machine tool
ball\|screw transmission system
error compensation
thermal characteristic analysis
piecewise exponential model
machining test verification
