Calculation method and device for product assembly deviation

Abstract

The invention provides a calculation method and device for product assembly deviation, and relates to the field of mechanical engineering. The method comprises the steps that according to tolerance information and assembly information of a product assembly prototype, and the positioning relations between geometrical features of parts of the prototype are determined; the theory constraint direction between the geometrical features is analyzed according to the positioning relations, and the actual constraint direction between the geometrical features under the constraint of positioning priority is analyzed; according to the actual constraint direction, a variable vector space is established; according to the variable vector space and the positioning relations between the geometrical features, assembly variation transfer lines corresponding to functional requirement information of the product assembly prototype and the constant directions of all the transfer lines are obtained; according to the assembly deviation transfer lines, whether the tolerance information and the assembly information are redundant or missing is judged, and a judgment result is obtained; according to model information, the tolerance information and the judgment result of the product assembly prototype, the magnitude of all deviation sources on the assembly deviation transfer lines is obtained, and the calculation of the assembly deviation is completed.

Description

technical field [0001] The invention relates to the field of mechanical engineering, in particular to a method and device for calculating product assembly deviation. Background technique [0002] Due to the influence of factors such as machine tool fixtures, cutting tools and process operation levels, there are inevitably differences between the surface of machined parts and the ideal surface, and there are errors in shape, size, position and direction, resulting in assembly deviation after product assembly. Affect the assembly quality of the product. [0003] In order to predict the assembly deviation, in the product design, first determine the assembly deviation transfer route according to the tolerance information and assembly information, then determine the deviation size of each deviation source on it, and finally obtain the assembly deviation through accumulation. Therefore, the transmission route of assembly deviation is the premise of calculating assembly deviation,...

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Problems solved by technology

[0006] To sum up, the existing research on the automatic search of the dimensional chain is relatively in-depth, but the deviation represented by each component ring in the dimensional chain is one-dimensional, and the three-dimensional deviation can be accumulated through one or more assembly deviation transmission routes. Moreover, deviations in multi-dimensional directions can be transmitted on each deviation transmission route, so the proposed algorithm cannot support the search of assembly deviation transmission routes for three-dimensional deviations, which affects the cumulative calculation of assembly deviations

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