A method for calculating the coordinates of the sphere center of a non-contact r-test measuring instrument using an eddy current displacement sensor
A displacement sensor, non-contact technology, applied in the direction of computer control, instruments, simulators, etc., can solve the problems that affect the measurement accuracy, the sensitivity of sensor readings is not high, and it is not yet perfect, so as to avoid measurement errors, range and stability Good results
Active Publication Date: 2020-11-03
SOUTHWEST JIAOTONG UNIV +2
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Problems solved by technology
The measurement algorithm of the contact R-Test instrument is relatively simple, and the deviation of the sensor installation position will not affect the measurement results, but the reading sensitivity of the sensor is not high due to mechanical structure problems, and the contact wear also affects the measurement accuracy to a certain extent
The non-contact R-test instrument can avoid the measurement error caused by the measurement of wear, and can be measured under the condition of high-speed rotation of the spindle. The measurement sensitivity and stability are better, but the spherical center coordinate measurement algorithm is complex and not yet perfect.
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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] Structure description of non-contact R-test measuring instrument using eddy current displacement sensor:
[0039] The structural model of the non-contact R-test measuring instrument using eddy current displacement sensor is as follows figure 1 As shown, it mainly includes three eddy current displacement sensors uniformly distributed and a standard measuring ball. According to the shortest distance spatial position relationship between the sensing plane of the sensor and the measuring ball, the coordinate calculation of the center point P of the measuring ball is performed.
[0040] figure 1 Medium AA 1 、BB 1 、CC 1 For the axis of 3 eddy current displacement sensors (A 1 , B 1 、C 1 is the center point of the sensing plane of the three sensors, A, B, and C are the center points of the bottom ends of the three sensors), an...
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The invention discloses a method for calculating the spherical center coordinates of a non-contact R-test measuring instrument using an eddy current displacement sensor, aiming at the design and measurement characteristics of the non-contact R-test measuring instrument, and calibrating the measurement of the non-contact R-test measuring instrument Coordinate system: According to the eddy current displacement sensor induction voltage characteristic curve equation and the sensor induction plane equation, the differential evolution algorithm is used to solve the coordinate result of the precise spherical center point in the measurement coordinate system. The invention can realize the accurate measurement of the three-direction displacement error of the cutter position point of the five-axis numerical control machine tool, and has better measurement accuracy, range and stability.
Description
technical field [0001] The invention relates to the technical field of error measurement of numerical control machine tools, in particular to a non-contact R-test measuring instrument spherical center coordinate calculation method using an eddy current displacement sensor. Background technique [0002] With the improvement of machining accuracy, the geometric error measurement of five-axis CNC machine tools is becoming more and more important. For the rotation axis of five-axis CNC machine tools, accurate measurement of the error of the tool tip point of the machine tool is the key to error compensation to improve its machining accuracy. There are no dedicated precision measuring instruments and specifications for the measurement of the geometric error of the rotational axis of the machine tool. Currently, the commonly used measuring instruments are ballbars and laser interferometers. However, these measuring instruments are not dedicated to the error measurement of the rota...
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IPC IPC(8): G05B19/401
CPCG05B19/401G05B2219/34242
Inventor 丁国富江磊朱绍维彭炳康丁国华张剑邹益胜
Owner SOUTHWEST JIAOTONG UNIV