A method, system and device for evaluating assembly accuracy based on dynamic tolerance

Abstract

The invention discloses an assembly accuracy evaluation method based on dynamic tolerance, which comprises the following steps: establishing an assembly model of a system to be assembled, and obtaining processing state parameters of all parts of the system to be assembled; obtaining current assembly state parameters and Position parameters of the parts to be installed; according to the above parameters and evaluation indicators, determine the maximum variation range of the position parameters of the parts to be installed; preset grouping parameters, and perform assembly and adjustment according to the grouping parameters Parameter simulation; according to the simulation results of the assembly and adjustment parameters, obtain the qualification rate of each group of parts to be assembled, and determine the dynamic tolerance of the parts to be assembled in combination with the required qualification rate; according to the dynamic tolerance of the parts to be assembled, evaluate the Whether the parts to be installed meet the actual assembly accuracy requirements. The method can accurately calculate the dynamic tolerance of the parts to be assembled, and evaluate the assembly accuracy of the parts to be assembled 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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