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Patent Searching and Data


Title:
METHOD FOR FORMING HOLE IN MOLDED ITEM
Document Type and Number:
Japanese Patent JPH04226706
Kind Code:
A
Abstract:

PURPOSE: To make it possible to form a hole in the transverse direction at the same time as molding of a molded item by providing a transverse punch which can be forwarded and retreated in the transverse direction on the outer mold of a mold and moving back and forth the transverse punch under a condition where a powder is compressed.

CONSTITUTION: A defined amt. of a specified powder is filled into the inside of an outer mold 6 by means of a feeder. At this time, a transverse punch 9 is retreated from the inside of the outer mold 6 to the outer direction. Then, an upper punch is pushed down by means of a piston 4 of a press machine and the powder is compressed at a specified compressing force between the upper punch and a lower punch 2. Then, under a condition where the pressure caused by these upper and lower punches 1 and 2 is kept const., an auxiliary piston 18 of a press machine is lowered and a roller 16 is pushed down to slide a pin fixing stage 11 in the direction around the center of the outer mold 6 by action of a cam and to drive the transverse punch 9 in the central direction of the molded body S from the periphery of the outer mold 6. Thereafter, the upper punch 1 and the auxiliary piston 18 (the roller 16) are returned to their original positions to form a transverse hole A.


Inventors:
TOTSUGI KATSUTOSHI
Application Number:
JP1990000416179
Publication Date:
August 17, 1992
Filing Date:
December 29, 1990
Export Citation:
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Assignee:
NGK SPARK PLUG CO
International Classes:
B28B3/02; (IPC1-7): B28B3/02