Metal founding – Combined
Patent
1974-01-10
1976-03-02
Shore, Ronald J.
Metal founding
Combined
164 76, 164120, 164130, 164132, 164324, 164345, 164348, 29 33C, 295263, B22D 11124
Patent
active
039411842
ABSTRACT:
Seamless tubular products made of metal, particularly steel, by the apparatus and method are manufactured by casting molten metal into a round, downwardly converging mold cavity having a coaxial removable cooled core of substantially uniform diameter throughout and which is less than the cavity's minimum diameter, the metal solidifying initially where it contacts the cavity wall and the core with solidification proceeding upwardly with incidental possible formation of pipe in the upper portion of the casting. Prior to the resulting casting cooling below a forging temperature, the core is removed and replaced by a mandrel having a flaring portion and which is pressed into the casting under pressure forging the casting radially outwardly and upwardly against the mold cavity wall with consequent closing and welding of any pipe. This forging may be done while the metal within the initially solidified skin portions remains molten so that undesired segregations are also forced upwardly to the top of the resulting billet. After removal of the mandrel, this forged billet, now having a relatively thick flaring wall, is placed in a rotary tube rolling mill having a mandrel providing a converging portion fitting the flared interior of the billet, the mill then rolling the billet into a seamless tubular product. Conventional rotary tube rolling mills have conical rolling rolls, and the casting mold cavity and forging mandrel may be made with conical shapes so that the billet produced fits the mill rolls, permitting the use of a conventional tube rolling mill altered substantially only by appropriate design of the mill's mandrel and its guide shoes.
REFERENCES:
patent: 2500556 (1950-03-01), Mallach
patent: 3504731 (1970-04-01), Farmer
patent: 3826301 (1974-07-01), Brooks
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