Press-forming product manufacturing method and press-forming facility

• US 9,469,891 B2
• Filed: 09/25/2012
• Issued: 10/18/2016
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Klaus Schmidt
• Original Assignee: Kobe Steel Limited
• Inventors: Okita, Keisuke, Naitou, Junya, Ikeda, Shushi
• Primary Examiner(s): Faison, Veronica F
• Application Number:
  US14/344,516
• Publication Number:
  US 20140338802A1
• Time in Patent Office: 1,484 Days
• US Class Current: 1/1
• CPC Class Codes: B21D 22/208 by heating the blank or deep-drawing associated with heat treatment C21D takes precedence
• CPC Class Codes: C21D 1/673 for die quenching
• CPC Class Codes: C21D 8/0247 characterised by the heat treatment
• CPC Class Codes: C21D 9/48 deep-drawing sheets
• CPC Class Codes: C22C 38/001 containing N
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/06 containing aluminium
• CPC Class Codes: C22C 38/42 with copper
• CPC Class Codes: C22C 38/50 with titanium or zirconium
• CPC Class Codes: C22C 38/54 with boron

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 Ac₁ 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.

Claims

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 Ac1 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 Ac1 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.