Graphical expression method for geometric tolerances

Abstract

The invention discloses a graphical expression method for geometric tolerances. Concretely speaking, geometric tolerance in a design model is expressed in a graphical manner. The method comprises the following steps: firstly, analyzing the design model, obtaining all composition surfaces of the design model and utilizing numeric characters to identify the composition surfaces in order; then, determining concrete types of attached tolerances on surface groups and identifying the concrete types of attached tolerances by corresponding labels based on annotation types attached to all the surface groups; recording surfaces related to shape tolerances and surface roughness again, recording surfaces related to position tolerances and references to obtain concrete value of tolerances; finally, correlating tolerance symbols, related surface labels, the reference plane and tolerance value by utilizing lines to set up a graphical expression model for all the tolerances. The graphical expression method for geometric tolerances is capable of effectively and clearly expressing the relationships among shape tolerance information and the related surfaces, which facilitates collection and arrangement of model design information.

Description

technical field [0001] The invention relates to the expression of three-dimensional model design information, in particular to a graphical expression method of shape and position tolerances. Background technique [0002] Process design involves a lot of processing information, such as: shape tolerance, position tolerance, roughness, etc. The shape and position tolerance information can determine the processing sequence of the process in the process of processing, but the extraction of the shape and position tolerance information between each processing surface is more complicated. [0003] The traditional two-dimensional process expresses the manufacturing information and manufacturing method of the product in the form of drawings manually, that is, first captures the shape and position tolerance of the product through the design drawing, and then uses the knowledge and experience of the workers to obtain the shape based on the shape. Bit tolerances and corresponding proces...

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Problems solved by technology

[0005] The three-dimensional process needs to obtain the shape and position tolerance information to make process decisions, but the traditional expression method is difficult to extract the shape and position tolerance, and it is complicated to use the computer to identify and extract the shape and position tolerance on the model and it is difficult to meet the requirements of informatization. In the face of complex information, shape tolerance, position tolerance and roughness cannot be managed in an orderly manner

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