Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1977-01-24
1979-10-02
Larson, Lowell A.
Metal deforming
By extruding through orifice
Utilizing internal forming means
B21C 2504, B21C 2310
Patent
active
041693655
ABSTRACT:
A needle comprising a cylindrical portion, a portion with longitudinal profiled channels intended to form the internal fins of a pipe, said portions being spaced apart lengthwise the needle and an intermediate portion joining the first two portions and varying in diameter which first decreases then increases in the direction from the cylindrical portion to the portion with profiled channels. The portion with profiled channels has the form of a truncated cone whose smaller base is directed towards the cylindrical portion. The needle according to the invention is used for pressing pipes with internal fins whose height exceeds their thickness by more than 4 times.
REFERENCES:
patent: 2932889 (1960-04-01), Kritscher
patent: 3808860 (1974-05-01), Yamaguchi et al.
Berdjugina Antonina I.
Erokhov Veniamin K.
Golovinov Mikhail F.
Kirillov Lev. P.
Konovalenko Evgeny D.
Crane Daniel C.
Larson Lowell A.
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