A Method for Adaptive Generation of Machining Trajectories of Narrow and Long Freeform Surface Parts

Abstract

The invention discloses a method for adaptively generating processing tracks of narrow and long free-form surface parts, which consists of the following steps: constructing free-form surface and other U-height section line groups of free-form surfaces of the part in the U direction of the length of the free-form surface of the part, and regenerating the curved surface by setting out the line groups , and compare the deviation of the regenerated surface with the given tolerance. When it is judged that the deviation is less than the given tolerance, calculate the arc length value of each section line of the regenerated surface and the minimum value of each curvature radius, and select the largest ratio of the arc length to the line spacing of the regenerated surface section c max , calculate c max For the corresponding tangent point set on the surface, the equichord height difference method is used to arrange points for each section line of the regenerated surface, and the corresponding projection point set of the tangent point set on the largest section line on the offset surface is used. Discrete each cross-section line on the V parameter line to obtain discrete point sets, and then obtain the processing trajectory of the part processing surface; the invention solves the problems of poor adaptability of the planning method, strong manual intervention, unsmooth planning trajectory, and self-intersection in the prior art. question.

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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