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

CHEN Feng, BING Zhigang, LI Shanghui, CHENG Li,YANG Yi, ZHANG Zhiquan, CHEN Jia

(Zhejiang Institute of Quality Inspection Science, Hangzhou 310027, China)

Abstract: Aiming at the problem of the limited measurement range of specific coordinate measuring machine (CMM), a new kind of relocation 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 auxiliary equipment and CMM. The data accuracy measurement of ultralong parts can meet the requirements, and it makes the precision measurement of the ultralong parts geometric tolerance come true.

Key words: coordinate measuring machine (CMM); ultralong parts; auxiliary equipment; relocation; precision error