Title:
FORMING OF SLENDER INTEGRATED BARREL
Document Type and Number:
Japanese Patent JPS5499070
Kind Code:
A
Abstract:
Elongated, thin wall cartridge cases or other shells are formed from substantially circular blanks 32 cut from sheet material 30 by steps including providing a blank in a blank holder 20 on a shell forming die 100 having an effective entrance and exit aperture. The wall connecting the entrance and exit apertures is defined by an arc 108 of a sector of a circle, the sector having an angle in the range of 12 to 34 DEG . The thin wall shell is formed by displacing the blank through the die by action of a punch 50. Blanks 32 may be provided in said blank holder 20 by punching blanks from sheet material 30 using a blanking punch 10 axially aligned with a blanking die 20 serving as the blank holder.
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Inventors:
CHIYAARUZU HENRII DEBENII
RONARUDO RII KORAKOUSUKII
RONARUDO RII KORAKOUSUKII
Application Number:
JP13776578A
Publication Date:
August 04, 1979
Filing Date:
November 08, 1978
Export Citation:
Assignee:
ALUMINUM CO OF AMERICA
International Classes:
B21D22/20; B21D22/21; B21D22/28; B21D35/00; B21C1/26; B21D51/54; (IPC1-7): B21C1/26; B21D22/28; B21D51/10
Domestic Patent References:
| JP10003586U | ||||
| JP14011562Y1 | ||||
| JPS3530138Y1 |