Online testing device and testing method used in machine tool spindle thermal error

Abstract

The invention discloses an online testing device and testing method used in a machine tool spindle thermal error. The testing method comprises the steps of using an eddy current sensor and a thermal imaging instrument to measure in real time the temperature of a spindle temperature sensitive point and thermal deformation at the front end of the spindle in the axial direction and the radial direction of a machine tool in an actual working condition, then the temperature and thermal deformation data are transmitted to a computer through the thermal imaging instrument and a PLC respectively, through a data processing part of thermal error testing software, a temperature sensitive point temperature rise-time curve, a spindle axial thermal deformation-time curve, and a spindle radial thermal deformation-time curve are obtained, and finally a spindle thermal error model is obtained through calculation. The testing device comprises the thermal imaging instrument, the eddy current sensor, a sensor signal conditioner, the PLC, a PLC analog quantity unit, the computer and a support; the thermal imaging instrument is utilized to take the place of a temperature sensor to measure the temperature data of the spindle temperature sensitive point, and the problems that the number of temperature sensors is large, wiring is complicated, and installation is difficult in actual measurement are solved.

Description

technical field [0001] The invention relates to the field of performance testing of machine tool spindles, in particular to an on-line testing device and testing method for thermal error of machine tool spindles. Background technique [0002] The thermal error of the machine tool refers to the non-uniform temperature field formed by the machine tool components due to the influence of friction heat, cutting heat and ambient temperature during the machining process, resulting in different degrees of thermal deformation of each component, which will cause the gap between the workpiece and the tool. Relative displacement occurs, which affects the machining accuracy of the workpiece. The literature shows that the thermal error accounts for about 40% to 70% of the total error of the machine tool, and the general thermal error model includes the temperature rise and thermal deformation of the temperature sensitive point of the machine tool. As one of the key components of the mach...

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Problems solved by technology

This method can realize the time prediction of the thermal deformation of the heat engine stage, but the intelligence level of the method of establishing the prediction model is low, and it cannot reflect the thermal deformation of the machine tool in real time and scientifically.

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