On-site Measurement Methods And Key Technology Research Of High-precision Large Shaft

In combination with the requirement of advanced manufacturing technology, the paper provides an in-depth study on on-site measuring methods and key technology of high-precision large shaft - one of the key issues of precision measurement technology. Based on existing research at home and abroad and aiming at the problems in above domain, some key technologies including on-site measurement system, measurement error analysis, geometrical error modeling, error separating, soft error compensation and form errors evaluation, etc., are studied deeply.On-site Measuremen(tOSM) of high-precision large shaft is one of key technologies in urgent need of research and development to ensure high precision requirement of product under the conditions of reducing cost and increasing productivity. The research on advanced OSM technology has great significance especially for high-precision large shaft with the production of small batch. As an important component of machining and measurement integration technology and an important means to ensure high precision and improved productivity, OSM got a great deal of research by scholars at home and abroad realizing the importance of the technology very earlier, and had been applied to production in a wide range. However, the existing OSM are not suitable for ultra-precision machining because with the complexity of the machining process, the existing techniques mostly do single diameter measurement with measurement accuracy restricted. Closely related to the error compensation technique and error separation technique, the research and application of OSM method of high-precision large shaft have great theoretical and economic significance for enhancing China's technical level of the manufacturing industry. Research on error compensation theory and error separation technology of CNC machine has been the focus of study at home and abroad. Particularly for OSM of high-precision large shaft, research on error compensation method and error separation method of OSM of high-precision large shaft are still void.The technical background for this paper is the key project "key technology research and equipment development of high-grade CNC Grinder oriented to the iron and steel industry, automobile industry (Project ID: 05 dz11c04)" from the Shanghai Municipal Science and Technology Commission. OSM methods and key technology of high-precision large shaft are studied in this paper with"high-precision CNC Grinder"as application target. The dissertation involves the device and system implementation method for OSM of high-precision large shaft where the reasons for OSM errors are analyzed. The methods such as error separating, geometrical error compensation model, and geometric error evaluation, etc. of OSM of high-precision large shaft are studied deeply, which will provide theoretical basis for greatly increasing measurement precision of large shaft. 1. The main factors causing OSM errors of the high-precision large shaft are analyzed and the problems existed in current OSM of high-precision large shaft machining tool are pointed out.2. The device and system for OSM of the high-precision large shaft are studied. The shape error measuring device of high-precision large shaft with independent intellectual property is designed for the error separating. The measuring system capable of error separating and shape error evaluation is developed.3. OSM device of large shaft is analyzed and studied based on multi-body system theory while the geometric error compensation model of OSM of large shaft is established4. Combined the traditional error separating method of straightness and roundness and the OSM character of high-precision large shaft, soft error separation method and the corresponding soft indexing strategy of OSM errors of high-precision large shaft with special-shaped plain line are presented.5. Existing form error evaluation methods are analyzed, real-coded parallel genetic algorithm with migration operator is presented, the evaluation models for generatrix straightness error, roundness error of shaft are established per assessing criteria of minimum region method and get proved via simulation.Finally, processing measuring system of roll grinder with the functions of error separation and error compensation is developed where most contents in this paper were verified by simulation calculation and simulation experiment.In summary, the key technologies in high-precision large shaft, such as geometrical error modeling, error separating, soft error compensating, and form error evaluation and so on , are studied deeply in this paper, which will provide theoretical basis to greatly increase OSM precision of large shaft. The achievement resulting from the study can be extended to the measurement of other parts.