Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Reexamination Certificate
2006-06-06
2006-06-06
Suhol, Dmitry (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
C072S267000, C072S357000, C072S358000, C029S888060
Reexamination Certificate
active
07055359
ABSTRACT:
A method for forging/molding a coarse blank of an oil cylinder, including steps of: placing burn-in softened aluminum material into a preheated mold; using a first punch head to first forge the aluminum material in the mold cavity from outer side of the molding hole so as to form a blank body of the oil cylinder with a first end cap, a second end cap and a shorter cylinder body; moving out the first punch head and connecting an extension mold with the mold; and immediately using a second punch head to secondarily forge the blank body in the mold cavity from outer side of the extension hole and making the end section of the second punch head extend into the mold cavity to a position near the inner end of the mold cavity, whereby the cylinder body of the blank body outward axially extends to the extension mold into a predetermined length so as to form the oil cylinder.
REFERENCES:
patent: 1328276 (1920-01-01), Ernest
patent: 2424075 (1947-07-01), Brauchler
patent: 6012288 (2000-01-01), Gualdoni et al.
patent: 6474127 (2002-11-01), Bonde
Jinn Ruey Industries Co., Ltd.
Suhol Dmitry
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