Fitting method for continuous tangent arc of tread pattern boundary

Abstract

The invention discloses a fitting method for a continuous tangent arc of a tread pattern boundary, which is applied to a CATIA/CAA development environment, and comprises the following steps of: selecting a tire pattern boundary fitted into a plane spline line, and setting sampling precision to obtain a group of two-dimensional data point sets on the boundary spline line; starting from the startingpoint, gradually adding subsequent points, and carrying out fitting by using a least square circle, so that the point set is sequentially divided into a plurality of groups of data points capable ofbeing fitted into an arc meeting a certain precision; calculating a theoretical continuous tangent arc by taking a starting point (or a stopping point) of each group of data points as a tangent point;adjusting the position of the tangent point to enable the deviation between the arc and the data point to be smaller; and calling a CATIA arc command to draw actual tangent arcs according to the finally adjusted arc information, and obtaining a finally fitted tire pattern boundary tangent arc. According to the invention, the two-dimensional plane spline line can be automatically converted into acontinuous tangent arc within a certain precision, so that the fitted pattern boundary is more convenient to mark and process an actual product.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design, and in particular relates to a fitting method of continuous tangent circular arcs on tire tread boundaries on a CATIA platform. Background technique [0002] With the wide application of CAD software, more and more designers use it for product design. CATIA software has been widely used in automobile, aerospace and other fields by virtue of its powerful surface modeling ability and friendly interactive interface. In the process of designing with CATIA, it is often necessary to convert splines into straight lines or arcs. For example, in product processing, most CNC equipment only have linear and arc interpolation, and cannot interpolate splines. In addition, when exporting 2D engineering drawings of CATIA software, curves, arcs, projection curves, etc., due to factors such as tolerances, irrational spline curves will be fitted. In this way, it cannot be marked in the 2D engineering...

AI Technical Summary

Problems solved by technology

Moreover, the CATIA software itself does not have the function of converting splines into continuous tangent arcs. Designers usually perform manual conversion through manual judgment. Al

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