転造条件が転造ねじの疲れ強さに及ぼす影響 : 第2報, 転造Vみぞ付試験片の回転曲げ疲れ強さ

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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 : 2nd Report, Rotating Bending Fatigue Strength of the Specimens with Rolled V Groove
  • 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 2

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In order to clarify the effect of rolling conditions on the fatigue strength of the rolled screw threads, the V grooves were rolled on the cylindrical specimens and the rotating bending fatigue tests were carried out on these specimens. For this purpose the simple rolling attachment was designed and manufactured. The rolling pressure in the case where the V grooves were rolled by this attachment, was measured. This rolling process was analysed, and compared with the process of thread rolling. In the experiment the rolling conditions of the V groove were changed by varying the number of revolutions of the specimen during rolling process. The specimen materials were medium carbon steel cold worked and Cr-Mo steel quenched and tempered. As a result it was found that the endurance limits of the specimens with the rolled V groove were 2.5∼2.8 times higher than those of the specimens with the cut V groove. Statistical analysis has shown that there exists a definite relationship between the rolling condition and the endurance limit.

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