Study on Prediction of Hole Shaft Fit Accuracy and Tolerance Design based on Joint Surface Error Modeling

Taking the cylindricity for joint surface of hole shaft fit as the research object, the algorithm was established for the actual variation interval of external associated fit dimension for cylindrical surface of hole shaft by Monte Carlo method, the formation mechanism of joint surface error of hole shaft under coupling effect three kinds of tolerance was analyzed, the actual error model of joint surface of cylindrical hole shaft under different fit properties were established, and the actual variation interval of error component of the joint surface and actual fit property were obtained, the prediction of actual assembly accuracy of hole shaft fit was achieved at the design phase. Finally, the feasibility and practicability of this methods were verified by an example of the analysis for assembly accuracy and tolerance design of hole shaft fit.