Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1994-12-21
1996-11-12
Larson, Lowell A.
Metal deforming
By extruding through orifice
Utilizing internal forming means
72478, B21C 2504
Patent
active
055728944
ABSTRACT:
A die (1) has a thin rod-shaped mandrel (2) tightly surrounded by the segments (11) of a gripper (3), the mandrel (2) being placed in the axial bore (5) of a mandrel holder (4). The inner peripheral surface of the axial bore (5) is shrinkage-fitted or otherwise fixedly fitted on outer peripheral surfaces of the gripping segments (11), thereby urging them to keep the thin rod-shaped mandrel (2) in place in the holder (4). The mandrel can have an extremely fine orifice forming end (9) of a diameter of 3 mm or less, such an fine can be prepared easily and precisely, and maintenance of the die can be done inexpensively when the orifice forming end will have been worn out or damaged.
REFERENCES:
patent: 439986 (1890-11-01), Tracy
patent: 2964178 (1960-12-01), Goldsmith et al.
patent: 4138871 (1979-02-01), Kawano et al.
patent: 4377085 (1983-03-01), McDermott et al.
patent: 5131253 (1992-07-01), Hopkins
Patent Abstracts of Japan, vol. 17, No. 365 (M-1442), Jul. 9, 1993 of JP 5057337 (Showa Alum. Corp.), Mar. 9, 1993.
Patent Abstracts of Japan, vol. 13, No. 318 (M-852), Jul. 19, 1989 of JP 1104412 (Showa Alum. Corp.), Apr. 21, 1989.
Larson Lowell A.
Yugen Kaisha Yano Engineering
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