非球面接触测量中触发式测头预行程误差补偿研究  

Research on Touch-trigger Probe Pre-travel Error Compensation in Aspheric Contact Measurement

作　　者：张铁建 于正林[1] 张茂云[1] 唐晨[1] ZHANG Tiejian;YU Zhenglin;ZHANG Maoyun;TANG Chen(School of Materials Science and Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学机电工程学院,长春130022

出　　处：《机械工程师》2022年第2期4-7,共4页Mechanical Engineer

基　　金：吉林省发展和改革委员会项目(2019C036-2)。

摘　　要：利用触发式测头对非球面零件进行接触测量时,由于其固有的预行程误差往往严重影响测量精度,为了降低该误差引起的精度损失,文中从测头自身结构出发,对预行程误差进行数学建模分析并研究其补偿方法。首先,对由于触发力产生的测杆变形位移和测球变形位移进行分析,并建立预行程数学模型;其次,根据测头触发力与被测件接触角度的不同,建立测头触发力模型;最终根据预行程数学模型,研究预行程误差的补偿问题。经实验证明,通过对测头结构特点分析出的测头预行程误差补偿方法,可以提高非球面零件的测量精度。When the touch-trigger probe is used for contact measurement of aspherical parts, its inherent pre-travel error often seriously affects the measurement accuracy. In order to reduce the loss of accuracy caused by the error, this paper conducts a mathematical modeling analysis on the pre-travel error and studies its compensation method based on the structure of the probe itself. The deformation displacement of the measuring rod and the deformation displacement of the measuring ball generated by the trigger force are analyzed, and the pre-travel mathematical model is established.According to the difference of the contact angle between the trigger force of the probe and the measured part, the trigger force model of the probe is established. According to the pre-travel mathematical model, the problem of pre-travel error compensation is studied. Experiments prove that the pre-travel error compensation method of the probe, which is analyzed by the structural characteristics of the probe, can improve the measurement accuracy of aspherical parts.

关 键 词：触发式 非球面 预行程 数学模型 误差补偿 

分 类 号：TH721[机械工程—仪器科学与技术]