关键词: 大型薄壁环件, 在线测量, 雷尼绍测头, 宏程序编程, 路径规划, 误差反馈

Abstract: Aiming at the problems of poor rigidity and easy deformation of large thin-walled ring parts (diameter ≥1 000 mm,wall thickness ≤3 mm) in aero-engine nacelles,as well as clamping deformation,low efficiency and insufficient accuracy in traditional offline detection,an on-line detection technology integrated with Renishaw probe and CNC lathe was explored. By planning the detection geometric elements of the ring part and the movement path of the probe,optimizing the calibration scheme,and compiling a macro program integrating anti-collision logic and error feedback,the integration of machining-measurement-verification was realized. Experimental verification was carried out with a Φ1 437 mm titanium alloy thin-walled ring part as the object. The results showed that the repeatability error of the optimized probe calibration was ≤0.002 mm,the deviation between the on-line measurement value and the true value of the coordinate measuring machine was ≤0.03 mm. Compared with the traditional vernier caliper,the measurement error was reduced by 50 %,and the detection accuracy was doubled; the measurement time per part was shortened from 2~3 min to 20~30 s,saving 50 % of labor cost and effectively avoiding the risk of clamping deformation. This process expanded the detection function of CNC machine tools,provided a practical scheme for the efficient and high-precision quality control of similar large thin-walled parts,and met the precision production needs of the aviation manufacturing field.

Key words: large thin-walled ring parts, on-line measurement, Renishaw probe, macro program programming, path planning, error feedback