Narrow and long type free-form surface part machining track self-adaptive generation method

Abstract

The invention discloses a narrow and long type free-form surface part machining track self-adaptive generation method, which comprises the following steps of: constructing a part free-form surface equal-U-height section line set in the length U direction of a part free-form surface, performing lofting through the line set to regenerate a curved surface again, and comparing the deviation of the regenerated curved surface with a given tolerance; when it is judged that the deviation is smaller than the given tolerance, solving the arc length value and the curvature radius minimum value of each section line of the regenerated curved surface, selecting the section cmax with a maximum ratio of the arc length to the line spacing of the regenerated curved surface, calculating a corresponding tangent contact set on the cmax, and conducting point distribution on each section line of the regenerated curved surface through an equal chord height difference method; according to the projection pointset corresponding to the tangent contact set on the maximum section line on the offset curved surface, discretizing each section line on an equal V parameter line to obtain each discrete point set, and further obtaining the machining track of the machining curved surface of the part; according to the invention, the problems of poor adaptability, strong manual intervention, unsmooth planning track,self-intersection and the like of the planning method in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of precision numerical control machining of free-form surfaces, and in particular relates to a method for adaptively generating machining tracks of narrow and long free-form surface parts. Background technique [0002] Precision forging blades, rolling blades, resin-based composite fan blades and other parts, the accuracy of the airfoil surface has been guaranteed by the mold, and no further processing is required, but the sharp changes in the curvature of the front and rear edges cannot be guaranteed by the mold, so CNC machining is required The way to obtain the leading and trailing edges that meet the precision requirements. The curved surface in the front and rear edge areas usually has a large gap between the length direction and the width direction, which is a typical narrow and long free-form surface. When processing such curved surfaces, in order to reduce the number of tool lifts and improve proces...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for adaptively generating the processing trajectory of narrow and long free-form surface parts, to solve the problem that the curvature of the curved surface of this type of parts changes drastically and the boundary of the long side is irregular, which leads to the occurrence of self-intersection of tool paths and unevenness of tool paths in the processing program. The problem of unreasonable clearance between straight and adjacent tool rails

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