Z-direction linear displacement and error measurement method and system of three-axis numerical control machine tool
A linear displacement, CNC machine tool technology, applied in measuring devices, instruments, optical devices, etc., can solve problems such as Z-direction linear displacement error, achieve the effect of eliminating deflection error, easy to popularize, and improve measurement accuracy
Active Publication Date: 2021-06-04
CHONGQING UNIV OF TECH
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Problems solved by technology
[0005] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a Z-direction linear displacement measurement method of a three-axis CNC machining center, which solves the technical problem that the Z-direction linear displacement error is relatively large due to the deflection of the main shaft during the measurement process
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[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.
[0044] 1) Measurement system
[0045] refer to figure 1 As shown, a Z-direction linear displacement measurement system of a CNC machine tool includes a mandrel 2 for installation on the machine tool spindle 1, and the end face of one end of the mandrel is used as a measurement surface; it also includes a Z-direction linear displacement correction program The computer 7 and the fixture 4 for fixing the optical sensor 3 on the machine tool workbench, the optical displacement sensor 3 is installed on the fixture 4 through the connecting piece 5 .
[0046] The fixture 4 includes an L-shaped plate and a fastening device. The L-shaped plate includes a bottom plate and a vertical plate that are perpendicular to each other. The bottom plate is used to be fixed by a fastening device (including a pressing plate, a T-bolt and a triangular toot...
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The invention relates to a Z-direction linear displacement and error measurement method and system for a three-axis numerical control machine tool. The method comprises the steps: installing a core rod, an optical displacement sensor and other measuring devices; initializing the optical displacement sensor, measuring at least two groups of data, and measuring each group of data according to the following mode: controlling a machine tool spindle to drive the core rod to move in the Z direction according to a set displacement amount, and then, controlling the machine tool spindle to drive the core rod to rotate at the rotating speed S, wherein the rotating period n is larger than 3; in the rotating process of the core rod, through the optical displacement sensor, measuring the distance from the optical displacement sensor to the measuring surface, measuring x data in each rotating period, the data volume of each group of data being n * x; according to the periodic fluctuation characteristics of each group of data, eliminating the measurement error of each group of data by adopting an average method, so that the distance between the optical displacement sensor after error elimination and the measuring surface is calculated, the distance being correction distance; and calculating the motion displacement of the core rod by subtracting the two correction distances corresponding to the two groups of data, wherein the motion displacement is used as a Z-direction linear displacement measurement value.
Description
technical field [0001] The invention relates to the technical field of three-axis numerical control Z-direction linear displacement measurement. Background technique [0002] The three-axis CNC machining center, that is, the three-axis CNC machine tool, after long-term operation, its displacement accuracy will decrease due to wear, aging and other reasons, so it is necessary to re-measure the displacement of each axis for accuracy verification. [0003] For the measurement of linear displacement in the Z direction, the flatness of the axial end face of the mandrel and the periodic end face runout and spindle tilt caused by the rotation of the main shaft during the measurement process, these error factors have a certain impact on the Z-direction linear motion accuracy of the mandrel. [0004] At present, the traditional measurement method is that the main shaft does not perform rotational movement, but only performs linear movement in the Z direction, and measures its displac...
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Login to View More IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 苗恩铭骆辉冉靖吕世鑫李淋
Owner CHONGQING UNIV OF TECH