The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 2021
Filed:
Dec. 20, 2017
Applicant:
T.rad Co., Ltd., Tokyo, JP;
Inventor:
Masaaki Takase, Tokyo, JP;
Assignee:
T.RAD CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 19/08 (2006.01); B21D 53/04 (2006.01); B23P 15/26 (2006.01); F28F 9/04 (2006.01);
U.S. Cl.
CPC ...
B21D 19/08 (2013.01); B21D 19/088 (2013.01); B21D 53/04 (2013.01); B23P 15/26 (2013.01); F28F 9/04 (2013.01); Y10T 29/49389 (2015.01);
Abstract
A machining method for a burred flat hole includes first an overhang portion is formed in a flat hole-forming region in a metal plate in a first step, subsequently a flat hole portion is formed in the overhang portion in a second step, and finally burring is formed on the peripheral edge portion of the hole portion in a third step. Accordingly, when burring is to be formed, overhanging machining and perforating machining have been substantially completed, and therefore pressing force of a punch for burring machining can be set to the minimum value necessary for burring formation.