A pre-travel error compensation method for online detection of CNC machine tools
A CNC machine tool and error compensation technology, which is applied in the direction of program control, computer control, general control system, etc., can solve the problem of low detection accuracy, achieve high accuracy, simple steps, and avoid the effect of poor measurement reliability
Inactive Publication Date: 2019-05-10
GUANGXI UNIVERSITY OF TECHNOLOGY
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[0003] The present invention aims to provide a pre-stroke error compensation method for on-line detection of CNC machine tools, which overcomes the shortcomings of low detection accuracy in the online detection of free-form surfaces in the prior art, and has the characteristics of simple steps and high precision
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Embodiment 1
[0032] The pre-travel error compensation method for online detection of CNC machine tools provided by this embodiment includes the following steps:
[0033] A. Generate a virtual surface model for the curved surface part to be detected, build measuring points in the virtual model software, and obtain the theoretical coordinates and theoretical normal vector directions of each measuring point; generate the NC of the surface to be detected according to the coordinates and normal vector directions of the measured points on the surface CNC detection code;
[0034] The step A is specific: generate a virtual surface model for the curved surface part to be detected, set the number of rows and columns of the measuring points and the arrangement of the measuring points in the virtual model software to automatically build the measuring points, and obtain the theoretical coordinates and theoretical coordinates of each measuring point. Normal vector direction; according to the theoretical...
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The invention provides a pre-travel error compensation method for the on-line detection of a numerically-controlled machine tool. The method comprises the steps of A, generating a virtual curved-surface model, the coordinates and the normal vector directions of measurement points on the model for a to-be-detected curved-surface part, and generating the NC numerical control detection code of the to-be-detected curved-surface part; B, establishing a model standard ball, generating the measurement points and the coordinates of the measurement points on the standard ball corresponding to the measurement points of the curved-surface part, and generating the NC numerical control detection code of the solid standard ball; C, automatically aligning the solid standard ball on the numerically-controlled machine tool; D, conducting the on-line detection to obtain the measurement coordinates of the solid standard ball, subjecting the coordinates of the solid standard ball to conversion and calculation, and obtaining the measuring head pre-travel error of each measurement point corresponding to the normal vector direction; E, automatically measuring the to-be-detected curved-surface part on the to-be-detected curved-surface part, conducting the compensation operation and obtaining the final measurement coordinates of each measurement point. The method overcomes the defect that the existing online detection of the free-form surface is low in detection precision in the prior art. The method has the advantages of simple steps and high precision.
Description
technical field [0001] The invention relates to the field of component detection, in particular to a pre-travel error compensation method for online detection of a numerically controlled machine tool. Background technique [0002] With the rapid development of aviation, aerospace, shipbuilding, automobile and mold industries, the application of curved surfaces is becoming more and more extensive, and the requirements for high-precision measurement of curved surface parts are also getting higher and higher. Continuously improving the detection accuracy of mechanical parts has always been a scientific research research hotspots. In order to overcome the disadvantage that the processing accuracy existing in the current free-form surface part detection needs to be detected offline on a three-coordinate measuring machine (CMM), the high-precision processing accuracy detection process is directly carried out on the CNC machine tool, which can avoid multiple assembly of parts. The...
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IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/37193
Inventor 陈岳坪张安社周晓慧汤慧方瑞谢梦敏
Owner GUANGXI UNIVERSITY OF TECHNOLOGY