Corner characteristic recognizing and constructing method based on pivot elements

Abstract

The invention provides a corner characteristic recognizing and constructing method based on pivot elements. The method comprises the steps of recognition of surfaces to be machined, point machinability judgment, pivot element recognition, corner characteristic construction and cutting depth increasing area recognition and construction. In recognition of the surfaces to be machined, the surfaces to be machined are recognized according to geometric types and attributes. In point machinability judgment, point machinability judgment standards and point machinability judgment methods based on machine tool machinability are established according to the fact whether a certain point on the surface of an element can be machined by a tool or not, and the machinability of points is judged. In pivot element recognition, pivot element recognition standards are established according to the geometric types, the geometric attributes and the machiniability of the surfaces, and pivot element recognition is realized. In corner characteristic construction, on the basis of the pivot elements, cutting-in elements and cutting-out elements are calculated, side R characteristics, bottom R characteristics and corner characteristics are constructed, and whether a corner is effective or not is evaluated according to an effectiveness judgment standard. In cutting depth increasing area recognition and construction, a cutting depth increasing area is recognized and constructed according to the relationship between the height of a corner characteristic top surface and the highest height of cutting elements. By the adoption of the corner characteristic recognizing and constructing method, a necessary technological foundation can be provided for corner machining automated programming, the manual interaction programming workload is reduced, the programming period is shortened and the element machining efficiency is increased.

Description

technical field [0001] The invention relates to a method for identifying and constructing corner features based on principal elements, which is used for identifying corner features in numerical control programming of complex integral structural parts of aircraft, and belongs to the technical field of aircraft digital manufacturing. Applying this method can realize the recognition of corner features in NC programming of complex overall structural parts of aircraft, and provide a technical basis for automatic programming of corners of aircraft structural parts, thereby shortening the aircraft development cycle. Background technique [0002] Compared with distributed structural parts, the overall structural part usually has a larger number of features, especially the corner features. For example, an aircraft panel part with a size of 3000mm*1200mm*35mm contains 548 corner features. In the interactive programming mode, 30 clicks of the mouse are calculated according to each corn...

AI Technical Summary

Problems solved by technology

In the interactive programming mode, 30 clicks of the mouse are calculated according to each corner programming, and a total of 16440 clicks are required. The workload is heavy and the programming cycle is long (about 2 to 3 days).

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