Monocular six-dimensional measurement method for high dynamic range and arbitrary contour error of CNC machine tools

Abstract

The invention discloses a high-dynamic wide-range any contour error monocular six-dimensional measurement method of a numerical control machine tool, belongs to the field of machine tool dynamic errordetection, and relates to a high-dynamic any wide-range contour error six-dimensional measurement method of a numerical control machine tool. In the high-dynamic any wide-range contour error six-dimensional measurement method, the monocular vision measurement technology cooperates with short-time stroboscopic illumination and a prior standard plate. In the method, a measurement tool and a measurement system are designed, and the monocular vision pose algorithm is combined with priori knowledge to increase the dimensionality and range of the machine tool interpolation contour capable of beingmeasured by vision. Through combination with the error distribution principle, a small measurement view field is utilized for improving the view field measurement precision of coding elements; the method is adopted for carrying out traversal shooting on each frame of image, and the actual six-dimensional motion contour of the machine tool can be obtained; and through comparison with the nominal motion contour of the machine tool, six-dimensional errors generated by the interpolation contour of the numerical control machine tool can be resolved. By means of the method, the monocular vision posealgorithm is combined with a datum conversion method, and the dimensionality of the machine tool interpolation contour measured by vision is improved; and wide-range any contour error six-dimensionalmeasurement of the numerical control machine tool in the small view field is achieved.

Description

technical field [0001] The invention belongs to the field of dynamic error detection of machine tools, and relates to a six-dimensional measurement method for high-dynamic, arbitrary, and large-range contour errors of numerical control machine tools with monocular vision measurement technology combined with short-time stroboscopic lighting and a priori standard board. Background technique [0002] Difficult-to-machine variable-curvature parts such as marine propellers, naval propellers, turbines and engine blades are widely used in major national equipment projects. The shape, position and geometric contour accuracy of such parts directly affect the performance of the equipment. Compared with the traditional three-axis CNC machine tool, the multi-axis linkage machine tool solves the problem of one-time clamping and processing of most complex variable curvature parts by virtue of its ability to adjust the pose angle of the tool and the workpiece at any time during the machinin...

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the defects of the existing technology. Aiming at the problem that the existing single measurement method cannot solve the six-dimensional measurement problem of high dynamic range, large range and arbitrary contour error of the CNC machine tool, a high dynamic large range arbitrary contour of the CNC machine tool is invented. Error monocular six-dimensional measurement method

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