Title:
金属プレートにおけるバーリング付き偏平孔の加工方法
Document Type and Number:
Japanese Patent JP6944470
Kind Code:
B2
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.
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Inventors:
Takaaki Masaaki
Application Number:
JP2018559623A
Publication Date:
October 06, 2021
Filing Date:
December 20, 2017
Export Citation:
Assignee:
T.RAD Co., Ltd.
International Classes:
B21D19/08; B21D22/02; B21D28/24; F28F9/02
Domestic Patent References:
| JP741332B2 | ||||
| JP1151592A | ||||
| JP10166090A | ||||
| JP1094837A | ||||
| JP8267147A | ||||
| JP2004202549A |
Foreign References:
| US20140158333 |
Attorney, Agent or Firm:
Takumi Kubota