A method for identifying position-related errors of machine tool translation axis based on ballbar measurement
A ballbar and translation shaft technology, which is used in measuring/indicating equipment, metal processing machinery parts, metal processing equipment, etc. simple effect
Active Publication Date: 2020-11-03
CHONGQING UNIV
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[0006] Aiming at the above-mentioned problems such as the difficulty of measuring and identifying the translational axis error, the present invention proposes a method for identifying the position-related error of the translational axis of a machine tool based on ballbar measurement, which is applicable to the measurement and compensation of the translational axis error of a CNC machine tool
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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] The method of the present invention is described by taking a common three-axis machining center as an example. Three-axis machining center machine tools usually include three translation axes of X, Y, and Z. Affected by the manufacturing, installation, and servo system control of screw pairs, guide rails and other components, there will be motion errors in the feeding process of each axis, which will eventually cause machining errors. The position-related error of the translational axis is one of the main sources of the comprehensive error of the machine tool. In the actual operation of the machine tool, each axis can be considered as a rigid body motion in space, there are 3 translational and 3 rotational degrees of freedom, and errors in the directions of 6 degrees of freedom are formed, including 3 positional errors and 3 a...
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The invention discloses a machine tool translation shaft position correlated error identifying method based on ball bar measurement. The method comprises the following steps: comprehensive error models of a cutter ball center of a ball bar moving on XY, XZ and YZ planes are respectively built; the ball bar measurement is performed on the XY, XZ and YZ planes to obtain ball bar length variables ineach arc position; the non-integral exponent polynomial prefitting is performed on position correlated errors of X, Y and Z axles; and the comprehensive error models of each plane are combined to solve each coefficient of non-integral exponent polynomials to realize identification of position correlated errors. The method is high in measuring precision, quick and convenient to operate and low in cost, and can accurately identify the position correlated errors of numerical control machine tool translation shafts.
Description
technical field [0001] The invention belongs to the field of machine tool error measurement, and relates to a method for identifying the position-related error of a translation axis of a machine tool based on ballbar measurement. [0002] technical background [0003] With the advancement of science and technology, modern processing technology is developing towards high speed and precision. How to improve the processing accuracy of CNC machine tools has become a key technology that has attracted widespread attention. At present, there are two main methods to improve the precision of CNC machine tools: error prevention method and error compensation method. Although the error prevention method can reduce the original error, it has great limitations and high cost to meet the accuracy of the machine tool by improving the design, manufacturing and assembly accuracy of the machine tool. The error compensation method can significantly improve the accuracy of the machine tool and re...
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IPC IPC(8): B23Q17/22
CPCB23Q17/22
Inventor 李国龙徐凯陶小会董鑫操兵
Owner CHONGQING UNIV