Five-axis numerical control machine tool rotating shaft structure parameter error compensation method

A technology of CNC machine tools and structural parameters, applied in the field of CNC machine tools, can solve the problems of cumbersome detection process, unsatisfactory precision, multiple disassembly and assembly, etc., and achieve the effect of simple detection process

Active Publication Date: 2021-03-19
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The RTCP motion control of five-axis CNC machine tools needs to use the structural parameters of the rotary axis for calculation and control. During the use of the machine tool, due to wear and equipment accidents, the structural parameters of the rotary axis change, and the actual structural parameters deviate from the structural parameter values ​​​​saved in the system. If the numerical control The machine tool still performs RTCP motion control according to the structural parameter values ​​saved in the system, which will result in the accuracy not meeting the requirements. Therefore, it is necessary to propose an effective method for detecting, identifying and compensating the structural parameter error of the rotary axis to correct the s

Method used

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  • Five-axis numerical control machine tool rotating shaft structure parameter error compensation method
  • Five-axis numerical control machine tool rotating shaft structure parameter error compensation method
  • Five-axis numerical control machine tool rotating shaft structure parameter error compensation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049]Example 1:

[0050]Five-axis CNC machine wheel rotary shaft structure parameter error compensation method, such asfigure 1 , Including the following steps:

[0051]Step S1: In the case where the five-axis CNC machine RTCP function is turned on, according to the preset detection trajectory, the rotation stroke of the rotating axis of the five-axis CNC machine tool is divided into multiple nodes, and the machine tool is controlled during the detection of each rotating shaft. Wrap to given nodes;

[0052]Step S2: Collect and record the offset of the tool center point in each node in the three directions of the X-axis, the Y-axis, the Z-axis, and the collected knife pointer data sequence is respectively recorded;

[0053]Step S3: Under the action of the tool center point offset error, establish a math model based on the rotary shaft structure parameter error identification mathematical model based on the knife tip point position deviation, and the identification equation is determined, and th...

Example Embodiment

[0058]Example 2

[0059]In the basis of the first embodiment, such asfigure 1 The method of the computer bed rotating shaft structural parameter error in the step S3 is specifically:

[0060]Step S301: Establish the theoretical location of a node of a node of a five-axis CNC machine wheel rotating shaft according to the number of control systems of the five-axis CNC machine toolThe mathematical model is:

[0061]

[0062]Where: θ is angle of rotating the axis at the sampling point; A, B, and C. Rotate direction vector saved in the CNC systemThe three elements, the unit vector; S, L, H is the positional parameter component of the three directions of the rotating center in the machine spatial coordinate system saved in the CNC system; these parameters can be obtained by the CNC system, which is known;

[0063]Step S302: Establishing a five-axis CNC machine wheel rotation shaft mechanical structure swings to the actual position of the tool when swinging to the corresponding node under the system stru...

Example Embodiment

[0082]Example 3

[0083]Based on the basis of Example 1 or 2, such asFigure 2- Figure 5Before the step S1, the standard ball 2 is mounted on the five-axis CNC machine, and the rotary axis of the five-axis CNC machine tool is in the initial state through the moving machine line coordinate axis, the standard ball 2 Move to the origin position of the non-contact three-way displacement sensor 3, the adjustment structure on the tool handle 1 adjusts the spherical heart of the standard ball to the spindle axis of the five-axis CNC machine tool, ensuring that the spindle slow rotation during non-contact The data variations of the three-way displacement sensor 3 are within ± 0.001 mm.

[0084]The other portions of the present embodiment are the same as those of the above-described Embodiment 1 or 2, so it will not be described again.

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Abstract

A five-axis numerical control machine tool rotating shaft structure parameter error compensation method comprises the steps: under the condition that an RTCP function is started, equally dividing therotating stroke of each rotating shaft of a five-axis numerical control machine tool into a plurality of nodes, and controlling a machine tool to swing to a given node in the detection process of eachrotating shaft; collecting offsets of the cutter center point relative to the initial position under each node in the X-axis direction, the Y-axis direction and the Z-axis direction; establishing a rotating shaft structure parameter error identification mathematical model based on the tool nose point position deviation under the action of the tool center point deviation error, obtaining an identification equation, and calculating a machine tool rotating shaft structure parameter error; compensating the structure parameter error value into a rotating shaft structure parameter corresponding tothe numerical control system to realize error compensation of the machine tool rotating shaft; collecting a knife point RTCP error to verify an error compensation effect, determining whether a rotating shaft structure parameter error is eliminated or not, and if the rotating shaft structure parameter error is eliminated, ending; and if the rotating shaft structure parameter error is not eliminated, carrying out the operation again.

Description

technical field [0001] The invention relates to the field of numerically controlled machine tools, in particular to a method for compensating structural parameter errors of rotating shafts of five-axis numerically controlled machine tools. Background technique [0002] The five-axis CNC machine tool can control the spatial direction of the tool axis, so that the tool maintains the best cutting posture, and realizes the processing of complex curves and surfaces. In order to effectively reduce the nonlinear error caused by the rotating axis during machining, it is necessary to control the tool nose point to ensure that it is always on the programmed track. The RTCP function of the five-axis CNC machine tool can realize the control of the tool tip point, ensure that the tool tip point is always on the programmed trajectory during the machining process, and effectively reduce the nonlinear error of the tool tip point. [0003] The RTCP motion control of five-axis CNC machine to...

Claims

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Application Information

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IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/35408
Inventor 胡金龙徐强李杰陶文坚蒋云峰宋智勇李颖楚王伟
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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