Method and device of three coordinate circular interpolations in use for digital control machine tool

A CNC machine tool and circular interpolation technology, which is applied in the control field, can solve the problems of restricting the processing speed of CNC machine tools and complicated CNC interpolation programs, and achieves the effects of improving processing speed, high processing accuracy and simplifying CNC programs.

Inactive Publication Date: 2004-10-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

This method solves the multi-axis linkage control problem of the single-chip microcomputer control unit, but the NC interpolation program of

Method used

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  • Method and device of three coordinate circular interpolations in use for digital control machine tool
  • Method and device of three coordinate circular interpolations in use for digital control machine tool
  • Method and device of three coordinate circular interpolations in use for digital control machine tool

Examples

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Example

[0036] Example 1: Set the center of the space arc at the origin O of the coordinate system, the allowable approach error of the arc is e = 0.001 (unit is mm, the same below), the arc radius R = 58mm, the arc starting point coordinate x 0 = 48.084, y 0 = 22.662, z 0 =23.202; arc end point coordinate x n = 22.662, y n = 32.433, z 0 =42.409; The number of arc interpolation calculations is n=36, and the maximum interpolation error is 0.0013mm.

Example

[0037] Example 2: Set the center of the space arc at the origin o of the coordinate system, the allowable approximation error of the arc is e = 0.001mm, the arc radius R = 200mm, the arc starting point coordinates x0 = 117.557, y0 = 100, and z0 = 127.202; circle The arc end point coordinates xn=165.808, yn=78.146, z0=80.006; the number of arc cycle interpolation is n=41, and the maximum interpolation error is 0.0011mm.

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Abstract

3-D circular arc curve is treated as a part of intersecting line between spherical surface and plane Pi passing through center of spherical surface. Technical scheme includes steps: building new coordinate system O-uvw in the plane Pi; using a intersection polygon to approximate the circular arc curve; carrying out interpolation calculating for circular arc curve by using periodic interpolation recursion calculating mode; converting calculated result to original coordinate system; finally, obtaining control data for digital control machining. Advantages are implementing interpolations for 3-D circular arc curve; increasing manufacturing accuracy and speed.

Description

technical field [0001] The invention relates to a three-coordinate arc curve interpolation method for a numerically controlled machine tool, belonging to the technical field of control. Background technique [0002] CNC machine tools are advanced automatic mechanical processing equipment, which have extensive and important applications in the machinery industry. Compared with ordinary machine tools, CNC machine tools have an interpolation function, which can control the movement of the machine tool table or tool according to the trajectory programmed by the CNC machining program, and realize the automatic processing of various parts. The interpolation method directly affects the working performance, machining accuracy, efficiency and machining quality of the CNC machine tool. The existing machine tool numerical control system has the function of linear and circular interpolation, through the combination of linear or circular interpolation, the processing of the surface cont...

Claims

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Application Information

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IPC IPC(8): G05B19/41
Inventor 韩庆瑶
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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