Five-shaft numerical control system cutter center point interpolation path interpolation method

Abstract

The invention relates to a five- shaft numerical control system cutter center point interpolation path interpolation method. The method comprises the following steps: determining cutter center point position information, cutter direction information, cutter center point feeding speed and an interpolation period; determining a conversion relation of programming instruction information in a workpiece coordinate system to machine tool coordinate system lower shaft position information; determining a cutter center point interpolation step length and segment length, and a motion stroke of each shaft, and combined with maximum restriction speed of each shaft, calculating shortest shaft interpolation time and shaft interpolation period number which are needed by completing a cutter center point interpolation path; determining a shortest interpolation period number under a speed constraint condition; determining a motion position of each interpolation period of each shaft, and completing motion information calculation of each shaft; when motion of each shaft is in accordance with an acceleration constraint requirement, carrying out three times of batten smooth processing of motion information of each shaft, sending the motion information to a servo, and ending present operation. According to the method, a programming path is subjected to interpolation processing, thus smooth five- shaft processing cutter center point interpolation can be carried out through a five-shaft machine tool with two rotating shafts.

Description

technical field [0001] The invention relates to a five-axis machining technology in the technical field of numerical control, in particular to a tool center point interpolation path interpolation method of a five-axis numerical control system. Background technique [0002] As a 5-axis CNC machine tool for machining free-form surfaces such as metal molds, parts that have rotational axes other than linear movement axes are used. It is known that a five-axis machine tool with linear movement axes of X, Y, and Z and two rotary axes, when performing multi-axis machining, because of the appearance of the rotary axes, the tool can process the workpiece at different angles. While the appearance of the rotary axis greatly enhances the processing flexibility, it also makes the programming of the five-axis processing program cumbersome, abstract and difficult to understand. Generally speaking, it is difficult to complete the five-axis NC machining program by handwriting, but the tool ...

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Problems solved by technology

[0011] Aiming at the problem of out-of-tolerance or discontinuous axis movement that may be caused by command-based real-time interpolation in the prior art, the technical problem to be solved by the present invention is to provide a machine tool dynamic constraint and machining path controlled by a numerical control system Constrained five-axis CNC system tool center point interpolation path interpolation method to achieve smooth and continuous five-axis machining tool center point interpolation

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