F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
F28F 3/02 (2006.01) B21C 23/10 (2006.01) B21C 25/00 (2006.01) B21C 25/08 (2006.01) B21C 37/15 (2006.01) F28F 1/02 (2006.01)
Patent
CA 2352028
A metal hollow member having a plurality of hollow portions extending in a longitudinal direction thereof and communication apertures formed in a partitioning wall partitioning adjacent hollow portions is formed by extruding a molten extrusion material through a die comprising a female die for forming an outer peripheral portion of the metal hollow member and a male die including a plurality of hollow-portion-forming protrusions corresponding to the plurality of hollow portions: and intermittently supplying fluid insoluble in the molten extrusion material into the partitioning wall from a bottom portion of a groove formed between the adjacent hollow-portion-forming protrusions while extruding the molten extrusion material, whereby the plurality of communication apertures are formed by fluid-released-apertures from which the fluid is released.
Marks & Clerk
Yano Sadahide
Yugen Kaisha Yano Engineering
LandOfFree
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