Development of Measuring Instrument for Motion Accuracy of Machine Tools Using Two Noncontact Displacement Sensors

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  • 2つの非接触変位計を用いた工作機械の運動精度測定装置の開発
  • 2ツ ノ ヒセッショク ヘンイケイ オ モチイタ コウサク キカイ ノ ウンドウ セイド ソクテイ ソウチ ノ カイハツ

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Abstract

Recently, some evaluation techniques have been proposed for five-axis machining centers. In those techniques, the simultaneous three-axis control motions in which the one rotary axis and two linear axes are controlled can detect the positional and angular deviations, and the simultaneous five-axis control motions for cutting the cone frustum of NAS 979 can evaluate various errors. Generally, ball bar instruments are used for the measurement of the displacement between the spindle and the table in those simultaneous multi-axis control motions. Also in the method using a master ball and a linear variable differential transformer, R-test instruments are a possible substitute for ball bar instruments. However, the displacement sensors of those instruments are the contact types. In this study, the measuring instrument for measuring the simultaneous multi-axis control motions is developed in order to avoid collision between the instrument and the five-axis machining center. The proposed measuring instrument consists of a master ball and two noncontact LED/CCD optical micrometers. One micrometer is mounted perpendicular to the other on the base plate. The base plate is fixed on the table and the master ball attached to the spindle is set in the intersection area of the LED light. The measurements of the simultaneous three-axis positioning and the circular motion were carried out on a three-axis machining center. The proposed measuring instrument can precisely measure the motion trajectory in three dimensions.

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