Compensation method of radius of tool for triaxial numerical control machine based on curve surface reconstruction

Abstract

The invention relates to a compensation method of the radius of a tool for a triaxial numerical control machine tool based on curve surface reconstruction, which generates a tool path based on a cutting plane, namely plans the tool path on a group of parallel planes, and then generates numerical control processing program with compensation parameters by post processing; the compensation method comprises the detailed steps: analyzing a G01 code in the numerical control processing program, extracting all tool location points, realizing the fast reconstruction of processing curved surfaces of the tool location points, respectively calculating unit normal vector of each tool location point on the curved surfaces of the tool location points, saving the unit normal vector of each tool location point in the G01 code of the tool location point as tool radius compensation vector, and constructing an extended G01 code; when the tool radius changes, calculating a cutting contact point coordinate by the tool location point and radius compensation vector in the extended G01 code, generating new tool location points according to the changed tool radius, and realizing real-time compensation of the tool radius in the triaxial numerical control processing process; and the compensation method solves the problem that the tool can not be compensated by online due to loss of geometric information of processing curve surfaces.

Description

technical field [0001] The invention relates to a radius compensation method for a tool of a three-axis numerically controlled machine tool based on curved surface reconstruction, and belongs to the technical field of digital control systems in numerically controlled machine tools. Background technique [0002] At present, three-axis CNC machine tools have been widely used in many mechanical manufacturing fields. However, since the CNC system of this type of machine tool cannot automatically compensate the tool radius wear in the process of machining, the programmer must first determine the tool used for machining when using the G01 command or code to program the CNC machining program. Tool type and parameters, that is, each NC machining program can only correspond to a tool with one parameter. Moreover, even for the same processing object, when the tool changes its radius size due to wear or other reasons, the machining program must be reprogrammed according to the current...

AI Technical Summary

Problems solved by technology

When the tool radius changes, the coordinates of the contact point can be calculated according to the tool position point and radius compensation vector in the extended G01 code, and a new tool position point can be generated according to the changed tool radius, so as to realize the cutting tool in three-axis CNC machining The real-time radius compensation function solves the problem that the tool compensation cannot be performed online due to the loss of geometric information on the processed surface

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