On-machine Measurement Of Lathe And Compensation Method Study Of Thin-walled And Difficult-to-cut Casing

Among the key parts of aero-engines,the thin-walled difficult-to-cut casing parts have the characteristics of poor rigidity,easy deformation,poor processing performance,and severe tool wear.This makes it difficult to control the wall thickness and the profile error during the processing of this type of part and ultimately leads to the problem of reduced product qualification rate or low processing efficiency.Therefore,in the processing technology of thin-walled difficult-to-cut casing parts,the detection and compensation of wall thickness play a key role in product quality control.Aiming at the problem of wall thickness control of thin-walled difficult-to-cut casing parts,this paper develops an on-machine measurement system with ultrasonic non-contact measurement to achieve an integrated wall thickness control method of "measurementprocessing-compensation".The common thin-walled and difficult-to-cut parts outer flame tube wall were processed to test,and the wall thickness error was controlled.1.Non-contact on-machine measurement system based on ultrasonic development.Through the development of hardware and software,the functions of wall thickness measurement,ultrasonic probe normal control,data processing,and transmission are realized,and the corresponding supporting software development is implemented.The measurement path automatic generation function finally realizes the wall thickness measurement data output and preliminary processing,laying a good foundation for further tool path compensation.2.Research on processing compensation methods.For the two main source directions of the wall thickness error of the thin-walled difficult-to-machine material,the machining tool error,and the tool wear error,the corresponding compensation method is designed in this paper.Through the on-machine wall thickness measurement results,the measurement results are fitted based on the NURBS curve,and the processing error of the previous step is compensated.And through the cutting test of the difficult-to-machine material superalloy,the tool wear error was predicted.Combining the two error compensation methods finally realizes the generation of wall thickness compensation toolpaths for difficult-to-machine thin-walled parts.3.Processing test of outer flame tube wall.This paper verifies the on-machine measurement and compensation methods through processing experiments.At the same time,for the typical thin-walled difficult-to-cut casing parts,the outer flame tube wall was validated,auxiliary support tooling was developed,and the processing technology was optimized and improved to achieve the wall-thickness error within 0.15 mm of the outer flame tube wall parts.