PIERCING METHOD, PRODUCTION METHOD FOR STRUCTURE HAVING HOLE, AND STRUCTURE HAVING HOLE

• US 20140017443A1
• Filed: 07/10/2013
• Published: 01/16/2014
• Est. Priority Date: 07/12/2012
• Status: Abandoned Application

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Matsuda, Toshifumi
• Application Number:
  US13/938,429
• Publication Number:
  US 20140017443A1
• Time in Patent Office: Days
• US Class Current: 428/131
• CPC Class Codes: B21D 22/022 by heating the blank or stamping associated with heat treatment C21D takes precedence
• CPC Class Codes: B21D 28/26 in sheets or flat parts
• CPC Class Codes: B21D 35/001 Shaping combined with punching, e.g. stamping and perforating
• CPC Class Codes: Y10T 428/24273 including aperture

Abstract

A piercing method using a hot-press includes: a piercing process of piercing a workpiece with a piercing edge; a concave portion forming process of forming a concave portions around a hole formed in the workpiece by the piercing process to enlarge a diameter of the hole; and a cooling process of cooling the workpiece.

Claims

1. A piercing method using a hot-press, comprising:

a piercing process of piercing a structure with a cutting edge;

a concave/convex forming process of forming a concave/convex portion around a hole formed in the structure by the piercing process to enlarge a diameter of the hole; and

a cooling process of cooling the structure.

2. The piercing method according to claim 1, wherein an enlarged diameter amount of the hole by the concave/convex portion which is formed by the concave/convex forming process is larger than a contraction diameter amount of the hole by the cooling process.

3. The piercing method according to claim 1, wherein the enlarged diameter amount of the hole by the concave/convex portion which is formed by the concave/convex forming process is large as a direction of a radially contracted diameter amount of the hole by the cooling process is large.

6. The piercing method according to claim 1, wherein the enlarged diameter amount of the hole by the concave/convex portion which is formed by the concave/convex forming process is large as a direction of a radially contracted diameter amount of the hole by the cooling process is large.

4. A method of fabricating a structure having a hole using a hot-press, comprising:

a heating process of heating the structure;

a piercing process of piercing the structure with a cutting edge;

a concave/convex forming process of forming a concave/convex portion around a hole formed in the structure by the piercing process to enlarge a diameter of the hole; and

a cooling process of cooling the structure while the cutting edge is inserted in the hole,

wherein an enlarged diameter amount of the hole by the concave/convex portion which is formed by the concave/convex forming process is larger than a contraction diameter amount of the hole by the cooling process.

5. A structure having a hole which is fabricated by a hot-press, comprising:

a hole formed by a piercing process using a cutting edge; and

a concave/convex portion formed around the hole to enlarge a diameter of the hole, wherein the hole and the concave/convex portion are formed after a heating process of heating the structure in the hot-press and before a cooling process of cooling the structure.