Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR MANUFACTURING BOTTOMED CYLINDRICAL BODY
Document Type and Number:
WIPO Patent Application WO/2021/193043
Kind Code:
A1
Abstract:
Provided is a method which is for manufacturing a bottomed cylindrical body and by which strict can manufacturing such as conventional drawing and squeezing, and cost reduction or environmental load reduction in a washing step can both be achieved. This method for manufacturing a bottomed cylindrical body comprises: a drawing step in which a metal plate is drawn by using a molding member with a processed surface having a hardness of Hv 1,500-12,000; and a squeezing step in which a member to be processed is squeezed through a coolant by using a molding member having a carbon film on a processed surface thereof, and a bottomed cylindrical body is formed, the method being characterized in that the coolant is a water-soluble coolant or a coolant having a boiling point of lower than 300ºC. Alternatively, this method for manufacturing a bottomed cylindrical body comprises: a drawing step in which a metal plate is drawn by using a drawing die with a processed surface having a hardness of Hv 1,500-12,000 (exclusive of 1,500) and a drawing punch with a processed surface having a hardness of Hv 1,000-12,000; and a squeezing step in which a member to be processed is squeezed through a coolant by using a molding member with a processed surface having a hardness of Hv 1,500-12,000, and a bottomed cylindrical body is formed, the method being characterized in that the coolant satisfies at least one among (a) the concentration of oil contained in the coolant is less than 4.0 vol%, (b) the coolant is a water-soluble coolant, and (c) the coolant has a boiling point of lower than 300ºC.

Inventors:
SHIROISHI RYOZO (JP)
MATSUMOTO NAOYA (JP)
SHIMAMURA MASAHIRO (JP)
KUMAGAI TAKUHO (JP)
OGAWA TOMOHIRO (JP)
Application Number:
PCT/JP2021/009418
Publication Date:
September 30, 2021
Filing Date:
March 10, 2021
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TOYO SEIKAN GROUP HOLDINGS LTD (JP)
International Classes:
B21D22/28; B21D22/30; B21D51/26
Foreign References:
JPH10137861A1998-05-26
JPH09285826A1997-11-04
JPS6028497A1985-02-13
JP2013163187A2013-08-22
JPH09287044A1997-11-04
JP2018204896A2018-12-27
JP2018204823A2018-12-27
Attorney, Agent or Firm:
OHTA PATENT AND TRADEMARK ATTORNEYS (JP)
Download PDF: