Technological Assurance of Machining Accuracy of Crankshaft

摘要

The typical technological processes of manufacturing crankshafts are considered. The main directions for technological assurance of the accuracy and quality of machining these parts are given. For a compensation of an influence of cutting force on a quality and an accuracy of manufacturing crankshafts, the design of the following steady rest was proposed. The studies of a dependence of the total cutting force for grinding wheels with different grit from ultimate strength of the material, width of main journal and infeed speed were made. The design calculations of the spring were performed and the value of the pressing force developed by spring was obtained, which is capable to level the influence of the cutting force on the deformation processes during crankshaft machining. The elastic deformations which occur when grinding the crankshaft main journal with and without the proposed steady rest were estimated by simulation modeling with finite elements method. The values of pressing forces, which are necessary to compensate the influence of the total cutting force on the shape accuracy of shaft, were obtained.