Method of centrifugally casting thick-walled metal tubes

摘要

610,851. Centrifugal casting-machines and processes. SOC. ANON. DES HAUTSFOURNEAUX ET FONDERIES DE PONTA-MOUSSON. March 21, 1946, No. 8743. Convention date, March 27, 1945. [Class 83 (i)] Casting composite tubes.-Molten metal is poured into an inclined centrifugal mould 2 through its only opening 6, the mould is then rotated and slowly brought into a horizontal position so that the metal does not flow out of the opening 6, and this operation is repeated one or more times in order to obtain a tube with a very thick wall or with successive layers of different composition. A tube of steel with a softer inner layer or a tube having an outer layer of stainless steel or other alloy may be made thus. The mould 2 may be made of metal with or without a refractory lining 5. It may be tilted to 15-20 degrees and charged with molten metal M by means of a ladle and funnel 16 while it is rotated at 800 r.p.m. As the metal is taken up and rotated with the mould, this is gradually brought into horizontal position by a hydraulic jack 13. After solidification, the operation is repeated one or more times with the same or different metal or metals. A tube 3 m. long with an inner diameter of 20 mm. may be made thus. In modifications, the mould is tilted by a rack or by a winch.