ねじ転造ダイスのねじ山公差について

抄録

The accuracy of produced thread in thread rolling is mainly determined by the tolerances for the blank diameter and the thread profile of rolling dies. The tolerance for the thread profile of rolling dies must be specified taking into account its relation to the tolerance for the blank diameter. In this investigation the relationship between them is discussed, and the draft of the Japanese standard (JIS), the British standard (BS) and the Russian standard (GOST) on the rolling die are compared from such a point of view. The method for calculating the tolerance for the blank diameter from the tolerance for rolling die is established under some assumptions. The results of calculations on the above three standards show that the draft of JIS is the most suitable for the present state in Japan.