Dynamic tolerance-based assembly precision evaluation method, system and equipment

Abstract

The invention discloses a dynamic tolerance-based assembly precision evaluation method, which comprises the following steps: establishing an assembly and adjustment model of a to-be-assembled system, and obtaining processing state parameters of all parts of the to-be-assembled system; acquiring current assembly state parameters of the assembled part and position parameters of the to-be-assembled part; according to the parameters and the evaluation indexes, determining the maximum change range of the position parameters of the to-be-assembled part; grouping parameters are preset, and assembling and adjusting parameter simulation is carried out on the maximum change range of the position parameters of the to-be-assembled parts in a grouping mode according to the grouping parameters; according to the installation and adjustment parameter simulation result, obtaining the percent of pass of each set of to-be-installed parts, and determining the dynamic tolerance of the to-be-installed parts by combining the required percent of pass; and according to the dynamic tolerance of the to-be-assembled part, evaluating whether the to-be-assembled part in the to-be-assembled system meets the actual assembly precision requirement or not. According to the method, the dynamic tolerance of the to-be-assembled part can be accurately calculated, and the assembly precision of the to-be-assembled part is evaluated according to the dynamic tolerance.

Description

technical field [0001] The invention relates to the technical field of mechanical assembly precision design, in particular to a dynamic tolerance-based assembly precision evaluation method, system and equipment. Background technique [0002] Dimensional tolerance, referred to as tolerance, refers to the size of the absolute value of the difference between the maximum limit size minus the minimum limit size, or the difference between the allowable upper deviation minus the lower deviation. For some general optical and mechanical products in our daily life, such as washing machines, refrigerators, toys, drones, cameras, etc., in the assembly process of these products, the final product is guaranteed by controlling the nominal value and tolerance of the position parameters of the parts. Assembly performance, this kind of tolerance we define as static tolerance. [0003] However, in the production process of high-precision optical-mechanical systems, such as space cameras, lith...

AI Technical Summary

Problems solved by technology

In the actual assembly process, although the corresponding tolerance indicators are also proposed for the parts, there are still situations in the assembly and adjustment process. Even if the assembly is carried out according to the design tolerance, the final assembly and adjustment performance and assembly qualification rate are difficult to meet the requirements.

[0004] The reason is that assembly is a dynamic process, and assembly errors are randomly introduced in the assembly process, which together with the original processing errors affect the assembly accuracy in a coupled nonlinear form.

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