大形ホブ盤用動的割出誤差測定装置の開発

概要

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A new apparatus for measuring the dynamic dividing error between hob and worktable in large gear hobbing machines is described in which a pair of small and high sensitive servo-accelerometers are mounted tangentially on a periphery of the large worktable, 180° apart, in order to detect the non-uniformity of rotation of the worktable. Two acceleration signals from the servo-accelerometers are added on the worktable, so as to be additive for the circumferen-tial acceleration and null each other for the rectilinear acceleration of the worktable. After the circumferential acceleration signal transmitted with a telemeter is processed by a pulse signal from the rotary encoder attached to hob shaft in this apparatus, the dynamic dividing error can be obtained. In an experimental use with a large size (3.3m worktable diameter) gear hobbing machine, the dynamic dividing error has -been measured and recorded. By transforming the recorded analogue signal with an FFT (Fast Fourier Transform) analyzer and by consulting to the schematic drawing of the rotational transmission mechanism, specific parts in the mechanism have been identified that cause the dividing error. Also, by transforming the circumferential acceleration of the worktable during quick starting test with an FFT analyzer, rotational natural frequency of the worktable can be obtained easily.
公益社団法人精密工学会の論文
1985-10-05