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Patent Searching and Data


Title:
PUNCH FOR H-CUT AND ITS MACHINING METHOD
Document Type and Number:
Japanese Patent JPH04288934
Kind Code:
A
Abstract:

PURPOSE: To reduce the generation of burrs and sagging.

CONSTITUTION: A punch 10 for punching is provided with a notch 11 in the shape of a long groove in a center and a pair of teeth 12 on both sides of the notch 11. The width of the notch 11 is formed with the same width as that of the H-cut protrusion of a round bar being an object to be machined. Also, the bottom faces 13 of the teeth 11 are inclined at an angle θ on the upper side from the inner side edges 11a of the notch 11 to both-side edges 13a. Also, the bottom faces 13 are inclined at an angle Ψ on the upper side from the front side edges 13b of the teeth 12 to the rear side edges 13c.


Inventors:
ARAI CHIYOJI
KAMIMURA KENICHI
Application Number:
JP7431991A
Publication Date:
October 14, 1992
Filing Date:
March 15, 1991
Export Citation:
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Assignee:
TAMURA ELECTRIC WORKS LTD
International Classes:
B21D28/02; B21D28/14; B23D15/00; B23D23/00; B23D35/00; B26F1/44; (IPC1-7): B21D28/02; B21D28/14
Attorney, Agent or Firm:
Masaki Yamakawa