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Patent Searching and Data

Document Type and Number:
Japanese Patent JP6818526
Kind Code:
PROBLEM TO BE SOLVED: To provide means for further increasing a torsional amount of a screw bar manufactured through a drawing process.SOLUTION: A screw bar is manufactured, on a drawing process machine, by drawing out a dice 901 while rotating it in a circumferential direction at a desired speed. The circumferential rotation direction is expressed as Sd. Drawing drive force to draw out a wire rod A can be obtained by rotating a pulling bobbin 912. A length (a unit length) in an axial direction of the screw bar required when the screw bar rotates one revolution is increased as the drawing drive force gets larger. Thus, a torsional amount of the screw bar can be further increased by adjusting a rotation direction Sr of a rotor on a straightening machine in a post-process to Sd, and thereby reinforce strength of the screw bar by increasing the maximum torsional strength, a torsional elastic limit and a torsional elastic angle.SELECTED DRAWING: Figure 7

Nobuhara Iwao
Norihara Yoshinori
Application Number:
Publication Date:
January 20, 2021
Filing Date:
November 28, 2016
Export Citation:
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Nobuhara Co., Ltd.
International Classes:
B21C19/00; B21C3/12; B21F7/00
Domestic Patent References:
Attorney, Agent or Firm:
Patent Business Corporation Saegusa International Patent Office