自動車用高能率生産ホブの二番角の検討

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  • Study on a relief angle of a TiN-coated hob.
  • ジドウシャヨウ コウ ノウリツ セイサン ホブ ノ 2バンカク ノ ケントウ

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The relief wear of a noncoated hob grows in the direction of hob rotation. With the increasing of a side relief angle, the width of relief wear geometrically calculated becomes less. In case of a TiN-coated hob, however, a TiN-coating layer restrains the wear from growing in the direction of rotation, and the angle contained by the relief surface and wear surface is large, so a TiN-coated hob is expected to be insensitive to the measuring of a relief angle. As a result of the experiments, (1) a TiN-coated hob is found to be insensitive in measuring the relief angle at a low cutting speed : (2) at a high cutting speed, the smaller relief angle is effective for lengthening the hob life : and therefore, (3) in high-speed and feed hobbing of automobile gears, the relief angle of TiN-coated hob must be as small and as possible.

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