US 7,934,409 B2Granted

Metal structure defining circular flanged hole and method for making the same

AssigneesHONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., Hon Hai Precision Industry Co., Ltd.

InventorsWen-Tao Wang, Cheng-Hung Lin, Zhi-Gang Hu, Yong Zeng, Zhi-Guo Yang, Ming-Gang Wang

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Abstract

An exemplary metal structure (10, 30) includes a base portion (14, 34), a flange (122, 322), and an edge portion (1241, 3241). The base portion defines a circular flanged hole (12, 32). The flange extends from a top surface of the base portion and the flange surrounds the circular flanged hole. The edge portion is configured for connecting an inside surface of the flange and the top surface of the base portion. The edge portion includes an edge surface, and a ratio of a radius of the edge surface (1242, 3242) of the edge portion with respect to a thickness of the base portion is less than 0.4. A method for making a circular flanged hole in a metal sheet (15) is also provided.

Claims8

Dependent claims

A method for making a circular flanged hole in a metal sheet, comprising:

punching through a metal sheet to form a preformed hole by a first punch;
punching a circumferential portion of the preformed hole by a second punch to form a protruded portion, and a size of the second punch is larger than that of the first punch;
and
forming a flange surrounding the preformed hole by a third punch, wherein the third punch comprises a shank portion and a non-circular cross section drill portion extending from one end of the shank portion, and the shank portion is cylindrical and has a circumference larger than that of the non-circular cross-section drill portion, wherein the flange is formed by rotating the third punch with the non-circular cross-section drill portion to displace the material adjacent to the performed hole.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 11/944,463Filed 23 Nov 2007
Priority: CN 2007 1 020031321 Mar 2007
Published: US 2008/0231050 A125 Sep 2008
Granted: 3 May 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B21J 5/066
Friction heat forging: flow drilling
B21C 37/292
Making branched pieces, e.g. T-pieces: forming collars by drawing or pushing a rigid forming tool through an opening in the tube wall
B21C 37/298
Making branched pieces, e.g. T-pieces: forming collars by flow-drilling
Y10T 29/185
Expanded metal making: by use of reciprocating perforator