Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR WORKING HOLE, METHOD FOR BURRING, AND PUNCH DIE THEREFOR
Document Type and Number:
Japanese Patent JP2002248527
Kind Code:
A
Abstract:

To provide a method for working a hole, a method for burring, and a punch die capable of reducing or preventing the clinging of shavings to the outer periphery of the punch die.

A method for working holes comprises a hole forming operation for forming a hole 60 penetrating a metal plate member 6 in the depth direction and a machining operation for advancing a punch die 2 into the hole 60 in the metal plate member 6 to shave off the periphery of the hole in the plate-like member by means of the die surface of a punch die 2 resulting in forming a machined surface in sequence. The machining operation comprises a first machining operation for shaving off a part of the periphery of the hole with a second die surface 22 so as to be discontinuous in the circumferential direction of the hole 60 while extending along the circumferential direction of the hole 60 in the plate-like member 6, and a second machining operation for shaving off the remaining part of the periphery of the hole 60 with a third die surface 24. A machined surface 61 extending circularly in the circumferential direction of the hole 60 in the plate-like member 6 is formed by means of the first and second machining operation.


Inventors:
UCHIDA MITSUTAKA
Application Number:
JP2001048212A
Publication Date:
September 03, 2002
Filing Date:
February 23, 2001
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
AISIN SEIKI
International Classes:
B21D19/08; B21D28/00; B21D28/24; B21D28/34; (IPC1-7): B21D28/24; B21D19/08; B21D28/00; B21D28/34
Domestic Patent References:
JPS55106528U1980-07-25
JPS53385U1978-01-05
JPH09164431A1997-06-24
Attorney, Agent or Firm:
Hiroshi Okawa



 
Previous Patent: PROGRESSIVE DIE

Next Patent: PRESS APPARATUS FOR CAR BODY PANEL