Abstract: A centrifugal casting apparatus comprises a mold mounted for rotation about the vertical axis thereof and having a bottom provided with a through axial opening. A member having a helicoidally shaped surface is axially mounted within the opening in the bottom. The member has a lower portion to be immersed into a melt and extending out of the opening and downwardly of said bottom of the mold. The mold and the member are connected with a rotation drive and a vertical motion drive.

Abstract: A method and apparatus for making metal tubes (12) by centrifugally casting muffs (12) in a rotating mold (10), the inner diameter of which is tapered, having a smaller diameter at the pouring end (14) and a larger diameter at the non-pouring end. The outer diameter of the resulting muff is then machined (30) to form a cylindrical member of uniform diameter along its entire length. The inner diameter is also machined (28) smooth, and the finished muff is then reduced (32,34) in diameter and wall thickness to make a long tube (12).

Abstract: This invention relates to a method of casting metal in a rotary mould or die under the protection of an inertizing atmosphere formed by a liquefied gas. In the mould or die, successive casting operations are performed with different metals while maintaining an infeed of liquefied gas during each of these casting operations and while the metal involved is solidifying, until an end product is obtained which is formed from a plurality of layers of different metals. The invention is applicable in particular, but not exclusively, to the production of centrifugally cast tubes and rolling-mill rolls.

Abstract: A method of heat-treating and, particularly, annealing, a ductile cast iron pipe in the form as centrifugally held against the wall of a centrifugal casting mold. The casting within the mold is heat-treated by introducing a hot gas of elevated temperature into the hollow of the casting. At the initial stage, the casting within the mold is in red-hot condition and, therefore, introduction of the hot gas into the hollow of the casting results in control of the dissipitation of heat energies from the red-hot casting to delay or slow down a cooling rate of the casting.

Abstract: The disclosure embraces a centrifugal casting apparatus of a character for casting comparatively small articles or objects of highly refractory metals, such as jewelry and similar articles, the centrifugal casting apparatus being enclosed in a housing, the arrangement having a motor-driven throwing arm and a secondary arm mounting components of the casting apparatus, the secondary arm being adapted upon energization of the motor to be centrifugally oscillated or rotated about a pivot axis to a diametrically aligned position with the throwing arm to rapidly accelerate flow of the molten casting metal into the mold, the apparatus including a closure or cover for the housing in association with means for automatically interrupting operation of the motor when the cover or closure is moved to an open position.

Abstract: A pile driving ram for driving piles into subaqueous ground, during which a heavy piston operating as a hammer is each time lifted by fuel explosion in a cylinder, comprises a considerable and expensive cylinder piece, which has inlet and outlet ports and which comprises at least two guide girdles for supporting guide members co-operating with at least one guide stay of a guide frame. In order to increase the lifetime of the cylinder piece, the core is moulded from precious steel according to the fling moulding method.

Abstract: A chill preventing arrangement is used in a metal mold employed in centrifugal casting. The metal mold is provided, at its spigot portion, with an end plate which has a central opening smaller in diameter than the internal diameter of the metal mold main body and which includes a metallic base plate, an intermediate layer of metallic alloy formed by flame or plasma spraying on a surface of the metallic base plate contacting the molten metal for casting, and a coating of ceramic material more than 0.7 mm thick formed on the intermediate layer by flame or plasma spraying for preventing chill formation at the corresponding end portions of tubular castings.

Abstract: A centrifugal casting machine comprising a support means having a housing pivotally mounted thereon about a horizontal axis to permit the housing to be tilted relative to the support means. A mold member is rotatably mounted within the housing and has a drive shaft connected thereto extending through the rearward side of the housing for connection to a power means such as an electric motor. The power shaft is provided with a bore extending therethrough to permit argon gas or the like to be furnished to the interior of the mold member to reduce the oxidation or the like to be furnished to the interior of the mold member to reduce the oxidation of the aluminum casting material. The casting material support stand is positioned forwardly of the housing and has a casting material hopper selectively vertically mounted thereon for supplying the casting material to the interior of the housing and mold member.

Abstract: A tilting centrifugal casting machine for producing a compound solid roll by centrifugally casting the outer shell and inner layer into an integral structure. The angle of inclination of the axis of rotation of the mold and the angle defined by the line connecting the center of the mold and the center of the rollers relative to the horizontal are selected to be within the optimum ranges, thereby to obtain a tilting type of centrifugal casting machine with high anti-vibration effect and safety in use, capable of producing a defect-free superior compound solid roll.

Abstract: In inclined type centrifugal casting apparatus for producing cylindrical castings, such as rigid rolls, or hollow cylindrical castings, such as thick sleeves, an axial component of force of a rotating molding box is so great as to require being supported by a tail stock. An inclined type centrifugal casting apparatus according to this invention is arranged such that eccentricity occurring between an axis of rotation of the tail stock and that of the molding box is adjusted for smooth operation by an Oldham's coupling mechanism provided between a tail stock shaft and a rotating plate mounted on an end surface of the rotating molding box, the coupling mechanism including a face plate provided on its opposite surfaces with guide grooves or projecting members extending perpendicularly to each other, the face plate being made of a pressure-resisting and anti-seizing alloy metal and there being further provided with a rotating member.

Abstract: Maintaining devices maintain the rotary casting mould. Each device comprises a set of coplanar rollers arranged around a region of the mould. Each set comprises two lower support rollers and an upper pressing roller carried by a pivotal arm. Each pressing roller is a driving roller and each roller has a diameter at least equal to the diameter of the mould and a length at least equal to the diameter of the roller.