Five-axis linkage cutter shaft vector plane interpolation algorithm

Abstract

The invention belongs to the technical field of numerical control processing and manufacturing, in particular to a cutter shaft interpolation algorithm which can be used for carrying out peripheral milling on a five-axis linkage numerically-controlled machine tool, and effectively controlling a cutter shaft vector in an inclined plane, thus eliminating non-linear error caused by adopting the traditional linear interpolation of a rotating shaft angle. In the algorithm, a new coordinate system is constructed according to the definition and property of the vector; circular interpolation is carried out on the plane at the new coordinate system, so as to obtain a new cutter shaft vector; the new cutter shaft vector is transformed into the cutter shaft vector at the coordinate system of the machine tool; the condition that the cutter point can move along a programming track can be controlled, and the cutter shaft vector is kept on the same plane all the time through the algorithm, and by combining compensation of a (rotation tool center point) RTCP; the algorithm is provided for eliminating the non-linear error in inclined plane processing by peripheral milling, and also can be applied in the peripheral milling of a free-formed surface; and additionally, the algorithm contributes to optimize end-milling processing; thus on one hand, the fluctuation of the cutter point can be prevented, and the processing precision can be improved; and on the other hand, the condition that the cutter can not deviate the effective cutting edge of the cutter is ensured, and abnormal wear and tear of the cutter is reduced, thus the surface quality of a workpiece can be improved.

Description

technical field [0001] The patent of the present invention belongs to the technical field of numerical control machining and manufacturing, and specifically relates to a tool axis vector interpolation algorithm used in circumferential milling of a five-axis linkage numerical control machine tool. Background technique [0002] In the process of machining free-form surfaces by five-axis linkage machine tools, the NC machining path is completed by continuous motion control of the tool tip point and its tool axis vector. The ideal situation is to keep the tool tip point moving along the curve on the surface, and at the same time control the tool axis vector to swing according to the shape of the surface, so as to keep the tool in the best cutting position. However, due to the swing of the tool axis vector, the tool nose point is offset, which in turn causes machining errors. Most of the existing five-axis machine tools use CAM programming and post-processing methods to solve th...

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Problems solved by technology

This can effectively reduce the machining error when the tool axis vector swing is small, but when machining the inclined surface of the circumference milling, especially in the machining of the tool axis change in the space plane, if the rotation axis is still adjusted in the way of linear interpolation Angle interpolation, there will be overcutting phenomenon, that is, the intersection line between the actual forming surface and the upper surface of the cavity is a curve, not a theoretical straight line in space (such as figure 1 shown)

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