Radius compensation algorithm for convex contour closed-angle linear and circular arc composite transitional cutting tool

Abstract

The invention discloses a radius compensation algorithm for a convex contour closed-angle linear and circular arc composite transitional cutting tool, namely D-type cutting tool radius compensation. The radius compensation algorithm comprises the following steps of: taking a ling segment BC, a circular arc CD and a line segment DE as a cutting tool central track of the radius compensation algorithm for the linear and circular arc composite transitional cutting tool; calculating the coordinate of a switching point; and establishing or canceling cutting tool radius compensation. Because the cutting tool central track is extended at a convex contour closed-angle transitional part, the cutting tool cannot always contact an A point any more, and the problem of closed-angle burn caused by B-type cutting tool radius compensation which stays at a closed-angle part for an overlong time is effectively solved. Due to the adoption of circular arc transition at the convex contour closed-angle transitional part, the cutting tool central track is smooth and continuous, and the problem that frequently acceleration and deceleration are required and the processing speed is difficult to improve because of broken line transition of C-type cutting tool radius compensation. The length of the cutting tool central track of the D-type cutting tool radius compensation is longer than that of the cuttingtool central track of the B-type cutting tool radius compensation, and is shorter than that of the cutting tool central track of the C-type cutting tool radius compensation.

Description

technical field [0001] The invention relates to a new type of numerical control processing technology, in particular to a compensation algorithm for the radius compensation of a cam profile sharp angle straight line arc compound transition tool. Background technique [0002] The sharp corner transition problem is a traditional problem in CNC machining. At present, most CNC system tool radius compensation adopts B-type tool radius compensation (abbreviated as B tool compensation) or C-type tool radius compensation (abbreviated as C tool compensation). [0003] B-type tool radius compensation calculates the movement track of the tool center according to the part contour size and tool radius in the program segment, uses the intersection point of the convex contours of adjacent program segments as the center of the circle, and uses the tool radius as the radius to connect the tool corresponding to the program segment profile Center locus, and connections must be tangent. After ...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, the present invention proposes a method that fully combines the advantages of the B-type tool radius compensation method and the C-type tool radius compensation method, which can solve the problem that the B-type tool radius compensation method stays too long at sharp corners. The tool radius compensation algorithm for convex contour sharp corner straight line circular arc composite transition can avoid the problem of frequent acceleration and deceleration caused by the broken line transition caused by the C-type tool radius compensation method, which can cause sharp corner burns and make it difficult to increase the processing speed.

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