Title:
METHOD FOR MANUFACTURING STEPPED HOLLOW SHAFT AND METHOD FOR MANUFACTURING MOTOR SHAFT
Document Type and Number:
WIPO Patent Application WO/2022/092269
Kind Code:
A1
Abstract:
Provided are a method for manufacturing a stepped hollow shaft and a method for manufacturing a motor shaft, wherein when a cylindrical hollow shaft that is a blank is narrowed and formed into a shaft that has a stepped shape in the radial direction, said forming can be performed efficiently, at low cost and with high productivity. In these methods for manufacturing a hollow shaft, a section to be swaged at one side of a product blank is deformed into a one-side primary deformation section, which is smaller in diameter than a reference diameter cylinder section. Next, a lower-side mandrel is retracted, a second punch is used to press the one-side primary deformation section of the partially-formed shaft, which has been set in a secondary mold of a second die, the one-side primary deformation section is sent between a one-side mold small diameter section and the lower-side mandrel, following along a second introduction angle from a mold equal diameter section and without contacting an ironing section of the lower-side mandrel, the one-side primary deformation section is narrowed to form a one-side secondary deformation section, a knockout punch is used to press an end surface of the one-side secondary deformation section, and the ironing section of the lower-side mandrel, which is in contact with the one-side secondary deformation section, is used to perform ironing of the one-side secondary deformation section, after which the lower-side mandrel is withdrawn from the one-side secondary deformation section.
More Like This:
Inventors:
OKUDA MASARU (JP)
Application Number:
PCT/JP2021/040042
Publication Date:
May 05, 2022
Filing Date:
October 29, 2021
Export Citation:
Assignee:
NAKAGAWA SPECIAL STEEL INC (JP)
International Classes:
B21D41/04; B21K1/10; B21J5/02; B21J5/06; B21J5/08; B21J13/02; F16C3/02
Domestic Patent References:
| WO2006080503A1 | 2006-08-03 |
Foreign References:
| JPS6091009A | 1985-05-22 | |||
| JPS63119938A | 1988-05-24 | |||
| JPH10249459A | 1998-09-22 | |||
| JPS57134228A | 1982-08-19 | |||
| KR20150059668A | 2015-06-02 | |||
| CN202490889U | 2012-10-17 |
Attorney, Agent or Firm:
COSMOS INTERNATIONAL PATENT & TRADEMARK OFFICE (JP)
Download PDF:
Previous Patent: BENDING STRUCTURAL BODY
Next Patent: OPTICAL CONNECTION STRUCTURE AND ILLUMINATION SYSTEM
Next Patent: OPTICAL CONNECTION STRUCTURE AND ILLUMINATION SYSTEM