主軸高速回転に伴う工作機械熱変位の測定法

概要

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A new measuring method and a new device are proposed to measure the thermal displacement of machine tools. It is intended that the device can be applied universally to the machine tools with higher-speed spindle in future and the more accurate measurement can be done. In this device, three sensors are set to the peripheral surface of the reference tool and three sensors are set to its end surface, to measure the translational and angular thermal displacements of the spindle against the table. This device is suitable for high-speed rotation, since the overhang of the reference tool from the spindle nose is as smaller as possible unlike the device discussed in ISO at present. Moreover, only the component of the thermal displacement can be obtained by the Three Points Method, being separated from the thermal expansion of the reference tool and the sensor fixture and the centrifugal expansion of the reference tool. In order to make clear the propriety of this method, experiments are carried out on the machining center with a high-speed spindle and their results are compared with those of the theoretical calculation. The experimental results agree well with the theoretical ones.
公益社団法人精密工学会の論文
1999-03-05