Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Flash or sprue removal type
Patent
1983-09-15
1984-11-27
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Flash or sprue removal type
264 15, 264157, 264163, 264323, 264325, 425392, 425395, 425806, 425808, B29C 1712
Patent
active
044850611
ABSTRACT:
A method and apparatus for forming a round end on a small plastic filament which includes a die having a channel extending into one side with a hemispherical interior end and a bore extending into the other side and coaxially aligned with the channel and having a conic interior end. The tip of the conic section communicates with the hemispherical section. A relief recess is spaced from the periphery of the hemispherical section by a land portion. The peripheral edge of the land portion, which also forms the edge of the channel, may be formed into a knife edge. In the die the filament is cold-formed to provide a hemispherical section spaced apart from the distal end of the filament. Material displaced during the cold-forming process is deposited in a relief section extending peripherally about the channel. When the cold-formed filament is removed from the die, the portion of the filament distal of the hemispheric portion is cut off and discarded, and the flash and displaced material is removed from the filament by abrasive tumbling.
REFERENCES:
patent: 2148079 (1939-02-01), Martin
patent: 2976573 (1961-03-01), Davis
patent: 2976575 (1961-03-01), Daubenberger
Akhavi David S.
Cudworth Richard W.
Iolab Corporation
McGurk Michael
Tobin Donal B.
Woo Jay H.
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