Title:
METHOD FOR MANUFACTURING COLD FORGED PRODUCT, DIE FOR COLD FORGING, AND DEVICE FOR MANUFACTURING COLD FORGED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2019/082237
Kind Code:
A1
Abstract:
This method for manufacturing a cold forged product is for manufacturing a bottomed cylindrical cold forged product by moving a punch in an approaching/separating direction with respect to a workpiece placed in a die. The distance L1 (mm) between a first reference position and an end edge of a first annular cooling-medium flow path closest to the workpiece satisfies H-t < L1 < 1.5 × H, wherein, when viewed in the approaching/separating direction, the length of the workpiece before start of pressing is defined by H (mm), the ending position of pressing is defined by the first reference position, and the thickness of the bottom of the cold forged product is defined by t (mm).
Inventors:
KADA OSAMU (JP)
YANAGI HIDEKAZU (JP)
AMAHAYA HIDENORI (JP)
TAKAYAMA KOJI (JP)
YANAGI HIDEKAZU (JP)
AMAHAYA HIDENORI (JP)
TAKAYAMA KOJI (JP)
Application Number:
PCT/JP2017/038160
Publication Date:
May 02, 2019
Filing Date:
October 23, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
MATSUBISHI METAL IND CO LTD (JP)
MATSUBISHI METAL IND CO LTD (JP)
International Classes:
B21J5/06; B21K1/18; B21J13/02; F16D65/02
Foreign References:
| JPS5268424U | 1977-05-20 | |||
| JP2003103324A | 2003-04-08 | |||
| JPS6036211U | 1985-03-13 | |||
| JPS53140256A | 1978-12-07 | |||
| JP2013092196A | 2013-05-16 | |||
| JP2015175462A | 2015-10-05 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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