As a universal typical part type in the manufacturing industry, shaft parts have a variety of part characteristics and manufacturing methods. This paper mainly studies the manufacturing method of gear shaft with large aspect ratio. Large aspect ratio means that the alignment difficulty of machining will be greatly improved, and the vibration in the machining process will also have a negative impact on the surface quality of parts. In order to fully reduce the technical risk of part development, scientific research and technical research such as process research and process test have been carried out, the key technology of production process has been mastered, and the technical bottleneck of part development has been broken through.
Through theoretical analysis and experimental verification, under the condition of strict control of cutting parameters, multi-point alignment can reduce the alignment error as much as possible. Combined with high-precision cylindrical grinding equipment, the machining accuracy of cylindrical journal of slender shaft can be effectively controlled. The proper selection of vibration reducing tool can effectively improve the machining accuracy and machining efficiency of inner hole. At the same time, due to the necessity of turning over processing of parts, multi-point alignment can reduce the alignment error and improve the accuracy. If there is a need to further improve the roughness of parts, the ordinary inner hole grinding method cannot cover the processing range of long and deep holes, which needs a special inner hole polishing device to ensure.