Research on Assembly Precision Prediction Method of Mechanical

To achieve the assembly accuracy prediction of complex product and provide a basis for tolerance optimization design, this paper analyzes error transfer properties and error accumulation method of assembly joint surface as the key point of error transfer and accumulation. The interactions between associated joint surfaces are analyzed, and the method of solving error transfer properties of joint surface group also the error calculation method of each joint surface is proposed. A new method of describing assembly relationship based on polychromatic sets theory is put forward, named Joint Surface Symbols matrix. Based on the matrix, the error transfer path search method of complex assembly is analyzed and the distribution of key error is determined. Assembly accuracy prediction is achieved by combining with the assembly error model based on multi-body dynamics and the accuracy of parts’ surfaces. At the last part, the feasibility and practicability of the research method is verified by an example.