転造条件が転造ねじの疲れ強さに及ぼす影響 : 第1報, 転造条件の検討

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タイトル別名
  • The Effect of the Thread Rolling Conditions on the Fatigue Strength of the Rolled Screw Threads : 1st Report, Investigations on the Thread Rolling Conditions
  • テンゾウジョウケン ガ テンゾウネジ ノ ツカレ ツヨサ ニ オヨボス エイキョウ 1

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The former investigations on the fatigue strength of the rolled threads were surveyed by the author. One of the causes of the difference among the results of these investigations seems to be the thread rolling conditions. If the effect of the thread rolling conditions on the fatigue strength of the rolled threads is clarified, the rolling condition for the rolled threads of fatigue strength extremely higher than that of the cut threads may be obtained. The rolling conditions were analysed for the thread rolling processes used today. From this analysis it has been found that the rolling condition is expressed by the number of revolutions of the blank from the start to the end of rolling and the type of the rolling pressure curve. The rolling pressure curves are classified into 3 types ; namely the decreasing pressure type, the constant pressure type and the increasing pressure type. This analysis was confirmed by the experiments on the oil pressure type thread rolling machine with special attachment.

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