Press-forming product manufacturing method and press-forming facility

Patent metadata

Field	Value
Publication number	US-9469891-B2
Application number	US-201214344516-A
Country	US
Kind code	B2
Filing date	Sep 25, 2012
Priority date	Sep 30, 2011
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

Provided is a press-forming product manufacturing method of manufacturing a forming product having satisfactory formability for a drawing process by press-forming a metal sheet using a press-forming tool with high productivity, including: heating the metal sheet to a transformation temperature Ac 1 or more; cooling the metal sheet to 600° C. or lower; forming the metal sheet by a forming tool; ending the forming process at a martensite transformation start temperature Ms or more; taking out the metal sheet from the forming tool; and cooling the metal sheet.

First claim

The invention claimed is:

1. A press-forming product manufacturing method of manufacturing a forming product by press-forming a metal sheet using a press-forming tool, comprising:
heating the metal sheet to a transformation temperature Ac 1 or more;
cooling the metal sheet to 600° C. or lower;
forming the metal sheet by a cooled forming tool;
ending the forming process at a martensite transformation start temperature Ms or more;
taking out the metal sheet from the forming tool after the forming process is ended; and
cooling the metal sheet having been taken out from the forming tool, externally of the forming tool,
wherein the forming process is performed by a mechanical press-forming process or a hydraulic press-forming process having a pressing speed of 100 min/second or more.

2. The press-forming product manufacturing method according to claim 1 ,
wherein the cooling process to 600° C. or lower is performed by clamping the metal sheet between metal members.

3. The press-firming product manufacturing method according to claim 1 ,
wherein the cooling process to 600° C. or lower is performed by ejecting a gas and/or a mist.

4. A press-forming facility that includes a heating furnace and a press-forming machine and is used to manufacture a forming product in a manner such that a metal sheet is heated to a transformation temperature Ac 1 or more in the heating furnace, and the metal sheet is press-formed by a cooled press-forming machine,
wherein a cooling unit that rapidly cools the heated metal sheet is provided inside the heating furnace or between the heating furnace and the press-forming machine, and the press-forming machine is a mechanical pressing machine or a hydraulic pressing machine having a pressing speed of 100 min/second or more and being configured to remove the press formed metal sheet at a martensite transformation start temperature Ms or more.

5. A press-forming product that is obtained by the press-forming facility according to claim 4 .

Assignees

• Kobe Steel Ltd

Inventors

• Okita Keisuke
• Naitou Junya
• Ikeda Shushi

Classifications

• C21D1/673

  for die quenching · CPC title

• C22C38/02

  containing silicon · CPC title

• C21D8/0247

  characterised by the heat treatment · CPC title

• C22C38/42

  with copper · CPC title

• C22C38/54 Primary

  with boron · CPC title