实现超长零件测量的三坐标测量机辅助设备研制及检测方法研究

Development of auxiliary equipment of CMM and research of testing method for ultra-long parts

针对特定三坐标测量机所存在的"测量范围受限,无法检测超过测量范围的超长零件"的问题,提出了一种基于测量基准重定位的超长零件测试方法,设计制造了一套基于三坐标测量机的超长零件辅助测量设备,制定了辅助设备和三坐标测量机相结合的超长零件检测方法。该方法利用精密几何体作为检测基准;采用移动超长零件、刚性变换测量数据和查错优化基准精度的理论,设计了相应测量软件;分析了测量精度影响因素,优化了测量方案。研究结果表明:在三坐标测量机和辅助设备相结合下,三坐标测量机长度测量范围由原来的750 mm扩展到了1 200 mm(拓宽了60%);超长零件的测量数据精度符合测量要求,实现了超长零件形位公差的精密测量。

Aiming at the problem of the limited measurement range of specific coordinate measuring machine （CMM） , a new kind of reloca- tion test method for ultra-long parts was put forward. Auxiliary equipment of ultra-long parts based on CMM was developed. A testing method of combining the auxiliary equipment with CMM for ultra-long parts of was formulated. The precision geometry was used as the test datum. The theory of moving ultra-long parts, rigid transforming data and debugging optimized reference precision was adopted and the corresponding measurement software was designed. The measurement precision influence factors were analyzed and the measurement scheme was optimized. The results indicate that the length measurement range is from 750 mm to 1 200 mm （ increased by 60% ） based on the combination of auxil- iary equipment and CMM. The data accuracy measurement of ultra-long parts can meet the requirements, and it makes the precision meas- urement of the ultra-long parts geometric tolerance come true.