歯車形状の非接触迅速測定法に関する研究(第1報)

光触針式ピッチ誤差測定器の試作

抄録

This paper presents a non-contact measuring system for pitch errors of a gear. The system has two laser beams which are equivalent respectively to a fixed probe and a measuring probe in a contact measuring system. One of the beam is used to making a trigger signal at each passing of a tooth. The other beam is used to detect displacement of a tooth flank from an origin. At every time when a tooth surface crosses the laser beam for a trigger, a displacement of another tooth flank is sensed by the other beam. The pitch errors are obtained from the sampled set of displacements. There is no mechanical interference between probes and a test gear in this system, therefore, high speed measurement is to be possible. In this measuring system 3-4 s was needed to measure pitch errors of a spur gear with 48 teeth. In the measurement, the maximum deviation was estimated to be 1.0 μm. In order to obtain more accurate pitch errors by averaging ten values of repeated measurement, it took about 60-90 s for sampling. In this case, the maximum deviation was estimated to be 0.2-0.3 μm.