Method for separating and handling thermal error, roundness error and turning error of main shaft of machine tool

Abstract

The invention discloses a method for separating and handling the thermal error, roundness error and turning error of a main shaft of a machine tool. The method comprises the steps of circumferentially uniformly distributing four temperature sensors and four electrical vortex sensors in the radial direction of the main shaft; setting the sampling time of the sensors according to the rotating speed of the main shaft, and acquiring the temperature and radial displacement signals of the main shaft of the machine tool; performing equivalent-cycle truncation for the radial displacement signals of the main shaft, and then carrying out differentiating to obtain the radial thermal displacement error of the main shaft, building a thermal error model through a least-square method, and then separating out the thermal error from the radial displacement error; performing weighted summation for the radial displacement signals of the main shaft, acquired by the four electric vortex sensors, so as to build a function relational expression, and then separating out the roundness error of the main shaft through discrete Fourier transform; subtracting the roundness error and the thermal error from the measured data, so as to separate out the turning error of the main shaft. The method achieves the separating of the radial thermal error, the roundness error and the turning error of the main shaft of the machine tool. Compared with the common three-point error separating method, the method has the advantage that the separating precision is improved.

Description

technical field [0001] The invention belongs to the field of machining error processing of numerical control machine tools, and in particular relates to a method for separating and processing thermal error, roundness error and rotation error of a machine tool spindle. Background technique [0002] As a key component of ultra-precision equipment or large-scale basic equipment such as precision machining centers, high-precision rotating motors, and large turbogenerators, the performance of the spindle directly affects the machining accuracy, stability, and application range of the machine tool. The radial measurement error of the spindle includes three errors: thermal error, roundness error and rotation error. [0003] For example, the invention patent (201410223092.X) discloses a method and device for measuring the rotation error of the main shaft with detachable installation and eccentricity. The provided algorithm performs a secondary separation to separate the mounting ec...

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Problems solved by technology

[0005] However, none of the above-mentioned documents simultaneously separates the three errors of thermal error, roundness error and rotation error included in the radial measurement error

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