Abstract: Disclosed herein is a device comprising: vacuum chamber; a stage configured to receive BMG in a molten state or a BMG feedstock, configured to spin, and located in the vacuum chamber; a heater configured to melt the BMG feedstock or to keep BMG in a molten state molten; wherein the stage comprises one or more conduits therein and the conduits are configured to accommodate a cooling fluid. Also disclosed herein is a method of forming a solid BMG sheet, the method comprising: disposing BMG in a molten state onto a stage; spreading the BMG in a molten state into a sheet of BMG in a molten state by spinning the stage; cooling the sheet of BMG in a molten state to form a solid BMG sheet.

Abstract: Disclosed is grey cast iron having an excellent durability and comprising carbon (C) in an amount of about 2.6 to 3.2 wt %, copper (Cu) in an amount of about 0.7 to 0.9 wt %, phosphorus (P) in an amount of about 0.4 to 0.7 wt %, molybdenum (Mo) in an amount of about 0.2 to 0.4 wt %, tin (Sn) in an amount of about 0.02 to 0.08 wt %, and a balance of iron (Fe) and trace amounts of unavoidable impurities, and a method for production thereof. The present invention improves tensile strength, fatigue strength, and the like and further reduces friction coefficient of the grey cast iron as compared with a conventional material. The grey cast iron has an excellent durability and provides a cost reduction of about 10% or more as compared with a conventional material.

Abstract: Devices and methods are disclosed for the centrifugal casting of spheres, particularly hollow spheres containing low air pressure, as well as solid and hollow spheres having a gradient internal density. Molten or self-hardening casting material is introduced into a hollow spherical mold and the mold made to rotate about two axes intersecting at the center of the mold. The resulting centrifugal forces cause the casting material to be evenly distributed about the inner surface of the mold. If a mixture of casting materials of different densities is used, the densest material will settle closer to the walls of the mold, while less dense materials will move closer to the center. The casting material is hardened and the resulting sphere is removed from the mold. One or more valves may be employed to transport fluent materials into and out of the mold. If gas is removed from a partially-filled mold prior to casting, the product will be a hollow sphere having an interior pressure less than ambient.

Abstract: A turbine blade having a leading edge portion and a flowing-off edge portion is formed using the following steps: providing a centrifugal casting device having a rotor and at least one crucible being accommodated in the rotor; providing a mold having an extended cavity for forming the turbine blade; arranging the mold so that an inlet opening of the mold is arranged with an outlet opening of the crucible, and further arranging the mold so that a mold leading edge is directed in a direction against the rotational direction of the rotor; forcing a metal melt by means of centrifugal forces from the crucible into the mold; exerting a pressure on the melt being forced into the mold until the temperature of the solidifying melt has reached a predetermined cooling-temperature; and relieving the pressure when the temperature of the solidifying melt is below the predetermined cooling-temperature.

Abstract: A method of producing a precision centrifugal casting includes: a) providing a centrifugal casting device having a rotor rotatable around an axis, at least one crucible accommodated in the rotor, and at least one mold associated with the crucible and disposed at a first radial distance from the axis, b) creating a metal melt within the crucible, c) rotating the rotor thereby forcing the melt using centrifugal forces from the crucible into the mold, d) exerting a pressure on the melt forced into the mold until the temperature of the solidifying melt has reached a predetermined cooling-temperature in a range of 1300° to 800° C., wherein the pressure corresponds to the centrifugal force acting on the melt just when the mold is completely filled, times a factor of 1.0 to 5.0, and e) relieving the pressure when the temperature of the solidifying melt is lower than the predetermined cooling-temperature.

Abstract: Techniques for forming cast parts for medical devices suitable for contact with internal regions of patients are described herein. Such parts can be small in scale (e.g., having a major axis less than 0.3 inches, and/or a minor axis less than about 0.08 inches), and can be formed from metals that have a high melting point and high reactivity with environmental components or mold surfaces, such as stainless steel and titanium alloys. Such techniques can include injecting molten metal into the sprue of a mold tree such that the side runners are backfilled after the molten metal impacts a closed end of the sprue. Side runners can be oriented in particular directions and positions to promote backfilling. As well, flask temperatures and the use of surfactants can also promote cast part formation, hindering the formation of surface defects.

Abstract: The invention concerns a production of precision castings by centrifugal casting, comprising the following steps: a) providing a centrifugal casting device having a rotor (1) being rotatable around an axis (A), and at least one crucible (8) being accommodated in the rotor (1) and at least one mold (4) being associated with said crucible (8) and being accommodated in a first radial distance (r1) from the axis (A), b) creating a metal melt (15) within the crucible (8), c) rotating the rotor (1) and thereby forcing the melt (15) by means of centrifugal forces from the crucible (8) into the mold (4), d) exerting a pressure on the melt (15) being forced into the mold (4) until the temperature of the solidifying melt (15) has reached a predetermined cooling-temperature in a range of 1300° to 800° C., wherein the pressure corresponds to the centrifugal force acting on the melt (15) at the moment when the mold (4) is completely filled times a factor of 1.0 to 5.

Abstract: Techniques for forming cast parts for medical devices suitable for contact with internal regions of patients are described herein. Such parts can be small in scale (e.g., having a major axis less than 0.3 inches, and/or a minor axis less than about 0.08 inches), and can be formed from metals that have a high melting point and high reactivity with environmental components or mold surfaces, such as stainless steel and titanium alloys. Such techniques can include injecting molten metal into the sprue of a mold tree such that the side runners are backfilled after the molten metal impacts a closed end of the sprue. Side runners can be oriented in particular directions and positions to promote backfilling. As well, flask temperatures and the use of surfactants can also promote cast part formation, hindering the formation of surface defects.

Abstract: Molds (1) with annular mold parts (2, 3) divided by at least one plane of division (E—E) and forming a plurality of cavities (8) disposed at least substantially radially to a centrifugation axis (A—A), serve for the production of precision castings by centrifugal casting, especially of parts made of materials containing titanium for internal combustion engines, the molds (1) and a casting system being contained in a closed chamber. To automate production, at least one mold part (2, 3) is made to rotate in its own rotational guide, and two mold parts (2, 3) together with the corresponding rotational guides are brought to a closed position for the casting and solidification and to an open position for the removal of the precision castings. When cast, the precision castings are preferably joined together at their radially inward pointing ends by a circumferential ring of the solidified metal and thus a circle of castings can be removed from the opened mold by a manipulating system.

Abstract: To identify and manufacture metallic glass forming alloys, large inertial forces or “g”-forces are created in a centrifuge assembly used to sequentially separate crystalline phases (particles) as they sequentially form and grow in a molten alloy during gradual cooling of the alloy below its liquidus temperature. These forces physically remove and isolate the actual crystalline particles from the remaining liquid as they are formed. Under the influence of a large g-force, this is accomplished by rapid and efficient sedimentation and stratification. Further contamination and nascent solid “debris” in the form of oxides, carbides, or other foreign particles can be removed from the molten alloy using the same sedimentation/stratification technique. Finally, a method of efficiently cooling and solidifying the final low melting stratified and decontaminated liquid into a solid glass component is proposed which utilizes convective heat transport by a cooling gas.

Abstract: In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a preheated mold (15) with a central gate (19) and several mold cavities proceeding from the gate toward the outer circumference (Da) of the mold (15). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold (15) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold (15) is heated, starting from the gate (19), by a heating device (20), which projects into the gate, so that the gate (19) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature gradient of at least 100° C., preferably of 200-600° C.

Abstract: In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a pre-heated mold (15) with a central gate (19) and several mold cavities proceeding from the gate toward the outer circumference (Da) of the mold (15). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold (15) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold (15) is heated, starting from the gate (19), by a heating device (20), which projects into the gate, so that the gate (19) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature gradient of at least 100° C., preferably of 200-600° C.

Abstract: The method comprises the step of arranging at the periphery of a shell (10) capable of withstanding a temperature of at least 400.degree. C. inserts (16) of highly wear-resistant material, preheating the shell (10) and the inserts (16) in an oven, removing rapidly the shell (10) together with the inserts (16) from the oven, placing them on a centrifugal casting machine which is set in rotation, pouring ductile cast iron (18) and demoulding after cooling.

Abstract: In a process for centrifugal casting metal pipe in a metal mold in which the mold is cooled by the application of cooling water to the external surface, the application of cooling water is interrupted for a time just prior to the pouring of molten metal to a time generally corresponding to the time of separation of the pipe being cast from the inner surface of the mold to thereby permit limited dilation of the mold and reduce tensile stress in the external portion of the mold.

Abstract: A mold used in centrifuge casting is cooled by taking advantage of inherent characteristics of the centrifugal casting process, and in particular the shape of the remaining sprue. The sprue has a conical profile and a conical depression formed by a vortex which results from the spinning mold. The cooling apparatus comprises a housing and plunger which engage the surface of the sprue and draw heat from the mold. Thermal conduction from the hot metal through the runners and sprue to the cooling head allows a mold to cool faster than traditional methods.

Abstract: A heavy wall monolithic iron pipe comprises nodular graphite in the outer portion of its wall and flake or quasi-flake graphite in the inner portion of its wall and a method for making the pipe. The central portion of the wall of the pipe may be a combination of nodular graphite and flake or quasi-flake graphite.

Abstract: A method of fabricating a polycrystalline silicon wafer, which method includes the steps of radially outwardly flowing molten liquid of silicon base material on the wafer forming surface of a turntable mechanism by means of centrifugal force, thereby forming a thin molten liquid layer in a prescribed atmosphere, and cooling and solidifying the same. An apparatus for fabricating the wafer is used to carry out the method with a recover tray arranged at the wafer forming surface for receiving the excessive silicon liquid scattered, and a wafer tray placed on the recovery tray. The wafer forming surface is cooled with coolant flowing in the wafer forming mechanism. Thus, large crystalline grains can be grown on the wafer in free states with the atmosphere from the inner surfaces of the casting mold.

Abstract: In the manufacturing of a shell for a cast iron rolling mill roll, heating the chill prior to casting so that the chill at the time pouring commences is in the approximate range of 300.degree. to 600.degree. F. in order to decrease the cooling rate of the metal after it passes through the solidus at a rate slower than normal to allow sufficient time through a critical temperature zone for the super-saturated solution to precipitate complex compounds in the solid solution phase. The present invention relates to a high alloy metal chemistry such as employed in the manufacture of a high chromium shell for a rolling mill roll whereby after solidification the cooling rate is decreased and controlled to allow a sufficient time through a critical temperature zone for the super-saturated solution to precipitate complex compounds in the solid solution phase.

Abstract: The apparatus and method provide an arrangement in which molten babbitt is fed into a spinning cylindrical bearing shell from a stationary molten babbitt tank having a babbitt pump immersed in the tank at an intermediate level, with the pump discharge being connected to piping to discharge molten babbitt into a babbitt trough from which the babbitt feeds to the interior of the spinning shell. The babbitt pump is driven for a controlled time period to feed a specified volume of babbitt into the trough and bearing in a continuous uninterrupted flow so that a carefully metered amount of molten babbitt is fed to the bearing. The apparatus also includes a control system operable to energize and deenergize various operating elements in a sequence including the drive motors, means for admitting a coolant about the hot spinning bearing shell, and the molten babbitt pump.

Abstract: The device comprises cooling water spraying systems extending throughout the length of the mould for cooling the latter. At least one additional local cooling water spraying element is slidably mounted on a guide bar through a slide. The bar is parallel to the mould and the local spraying element is adjustable in position on the bar for each casting for further cooling a selected part of the mould.

Abstract: An improved investment casting process for producing dental restorations, particularly a dental crown, comprising the steps of fixing a wax pattern onto a truncated cone in a metallic ring having a lining of a cushioning material, pouring an investment material into the space around the wax pattern in the metallic ring, drying the resultant product, melting out the invested wax pattern, curing the resultant product at a temperature of 700.degree. to 950.degree. C for 20 to 150 minutes to give a mold, fixing the mold thus obtained to a centrifugal casting machine and casting a molten chromium-cobalt and/or nickel alloy in the mold maintained at a temperature of 100.degree. to 500.degree. C.

Abstract: A method and apparatus for casting steel slugs which utilizes a measured charge of molten steel discharged centrally of a rotating table having radial channels to distribute the metal rapidly to circumferentially-spaced, individual, trunnion-mounted receptacles at the end of each channel. The receptacles are designed to have a center of gravity outside the trunnion axis when empty, and inside the trunnion axis when charged. After a predetermined cooling period, a mechanical latch release allows the rotating, loaded receptacles to dump radially to a suitable conveyor and the cycle may be repeated.

Abstract: Aluminum is produced from low-grade aluminum alloys by melting an Al-X alloy wherein X has a higher specific weight than aluminum and forms an eutectic mixture rich in aluminum, the starting melt being on the side of the eutectic mixture rich in aluminum, and radially cooling the melt from the inside to the outside while under the effect of centrifugal force.

Abstract: The machine comprises a casing, a rotary casting mould and means for spraying cooling water onto the mould. A tubular duct is secured to the inside of the casing and opens into the interior of the casing and is for connection to a forced suction means.