Title:
PUNCH DIE OF A PUNCH PRESS, DIE FOR DEEPENING CUTTING, AND METHOD OF FORMING LONG HOLES IN A PLATE
Document Type and Number:
WIPO Patent Application WO/2012/093523
Kind Code:
A1
Abstract:
A punch die (1) has a first cutting edge (4) and a second cutting edge (5) arranged so as to be aligned in a board feed direction (A), wherein the sides of said cutting edges along said direction (A) are positioned in the same plane. The first cutting edge (4) protrudes downwards a step below the second cutting edge (5). The bottom edges of the downstream side and the upstream side of said direction (A) are punching edges (4a, 4b), and the bottom edge along said direction (A) is a first cutting/punching edge (4c). The cutting/punching edge (4c) has a shape protruding downwards in the center of said direction (A). On the second cutting edge (5), the bottom edge on the upstream side of said direction (A) is a punching edge (5a), and the bottom edge along said direction (A) is a cutting/punching edge (5c). The cutting/punching edge (5c) has a shape that slopes upwards towards the upstream side of said direction (A).
Inventors:
MATSUMURA KOHEI (JP)
Application Number:
PCT/JP2011/076379
Publication Date:
July 12, 2012
Filing Date:
November 16, 2011
Export Citation:
Assignee:
MURATA MACHINERY LTD (JP)
MATSUMURA KOHEI (JP)
MATSUMURA KOHEI (JP)
International Classes:
B21D28/00; B21D28/02
Foreign References:
| JP2003230920A | 2003-08-19 | |||
| JPS6296928U | 1987-06-20 | |||
| JPH0751766A | 1995-02-28 |
Other References:
See also references of EP 2662160A4
None
None
Attorney, Agent or Firm:
SUGIMOTO, Shuji et al. (JP)
Shuji Sugimoto (JP)
Shuji Sugimoto (JP)
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Claims: