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公开(公告)号：US09923340B2
公开(公告)日：2018-03-20
申请号：US14805955
申请日：2015-07-22
Applicant: NGK Spark Plug Co., LTD.
Inventor： Reiji Wakazono
Abstract: A workpiece having a first portion and a second portion is held. The first portion extends in the direction of a center axis of the workpiece, and a male thread is to be rolled on the first portion. The length of the second portion in a direction perpendicular to the center axis is longer than that of the first portion. The male thread is formed on the outer circumference of the first portion using two rolling dies through rolling. At least a first portion center axis that is a part of the center axis and corresponds to the first portion is separated in a prescribed direction from a first virtual plane containing the center axes of the two rolling dies. In the workpiece held, the first portion center axis is inclined such that its distance from the first virtual plane increases with distance from the second portion.
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