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The pouring of metals under gravity is generally an extremely damaging process, creating defects in the casting which limit properties and performance, but the damage can be limited to some extent by extreme care. Step 1—an operator places a ceramic shell mold, sprue end down, in a mold chamber. The weighted sum technique was employed to convert this multi-objective optimisation problem to a single objective one. Model investigations on test plates by the University of Birmingham confirmed this result. Copyright © 1937 Published by Elsevier Ltd. https://doi.org/10.1016/S0016-0032(37)90136-4. Counter-gravity casting, also called vacuum casting, is a mould filling technique in which low pressure created inside a mould cavity, causes prevailing atmospheric pressure on the melt surface to bring about an upward or counter-gravity movement of the melt into the mould cavity. enough amount of alloy in a closed crucible of an induction furnace and to use the counter-gravity filling method to fill a single (shell) mould, thus assure smooth liquid alloy flow behaviour and in … Counter-gravity is recommended as the process for the future. Counter-Gravity Casting Wikia is a FANDOM Lifestyle Community. Historic problems which have impaired success are analysed and solutions presented. The process was patented in 1972 by Hitchiner Manufacturing (Lessiter & Kotzin, 2002) casting quality and yield for a novel counter-gravity casting process (CRIMSON). It also offers an opportunity of introducing automatic control into the process by changing the pressure under which the metal is forced into the mold cavity. Counter Gravity Casting. The Steps to Counter-Gravity Casting. During the disclosed counter-gravity casting, various parameters can be controlled, selected, or determined to form desired hollow part. Abstract: Counter-gravity casting is a process where molten metal is forced into the casting cavity against gravity. Casting technology developmentshave led to a manufacturing process that allows the casting of thin wall (2-3mm) heat resistant ferritic stainless steel exhaust manifolds which can replace stamped and tubular weldments as well as iron castings where temperature requirements are increased. Functional Counter-Gravity™ Casting Technology. Counter-Gravity Casting Wikia; Main Page; Videos. In contrast, counter-gravity casting has the potential to fill moulds without the production of any defects. Counter-gravity filling and pressurization during solidification have been separately shown to improve casting quality in sand cast steel. The weighted sum technique was employed to convert this multi-objective optimisation problem to a single objective one. Metrics details. Hence, so-called "hooked" gates or bottom pour gates are quite generally … Counter-gravity casting is a process where molten metal is forced into the casting cavity against gravity. In a business where reliability and efficiency are paramount, the CPC Group is proud to have more than 100 years combined experience in the manufacturing of over 1,000 state-of-the-art casting machines. Counter-gravity casting of hollow shapes Download PDF Info Publication number US20140083646A1. * BY SAMUEL P. WETHERILL, President Wetherill Engineering Company, Philadelphia. The process started with common steels, was extended to heat resistant superalloys, and recently even titanium alloys are being cast routinely using ceramic crucibles. Step 1—an operator places a ceramic shell mold, sprue end down, in a mold chamber. Find Counter Gravity Casting Equipment related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Counter Gravity Casting Equipment information. The KSM Casting Group manufactures both small, compact components, and very large components in the tilt-mold casting process. This aim is to improve shaping capabilities and microstructural control for TiAl castings. Vacuum Pressure Casting Machine (CXM-III) #category2# Community. During the disclosed counter-gravity casting, various parameters can be controlled, selected, or determined to form desired hollow part. This aim is to improve shaping capabilities and microstructural control for TiAl castings. US20140083646A1 US13/628,593 US201213628593A US2014083646A1 US 20140083646 A1 US20140083646 A1 US 20140083646A1 US 201213628593 A US201213628593 A US 201213628593A US 2014083646 A1 US2014083646 A1 US 2014083646A1 Authority US United States Prior art … Briefly, metal is melted in a vacuum in the lower chamber of the casting machine. We use cookies to help provide and enhance our service and tailor content and ads. In contrast, counter-gravity casting has the potential to fill moulds without the production of any defects. Copyright © 2020 Elsevier B.V. or its licensors or contributors. The counter-gravity casting of steel railroad wheels by the Griffin Process. No. The design combines induction skull melting, counter‐gravity casting, and mold heating, which facilitates both filling and microstructure formation via a controllable process. (or is it just me...), Smithsonian Privacy The purpose of this story is to show how relaxed and safe counter-gravity casting can be. As in gravity die casting, we can fill the mold and direct the process of solidification of the material by cooling. In this case, the dies are machined from graphite. Presented at a meeting held Thursday, March, 4, 1937. Counter Gravity Casting. Add new page. The figure on the right shows the occurrence of oxide films and the bending strength in dependence of the velocity of filling for plates of 5 mm and 10 mm thickness, respectively. Counter-gravity casting of hollow shapes Download PDF Info Publication number US20140083646A1. A common form of this is called the Hitchiner process after the Hitchiner Manufacturing Company that invented the technique. In this study, IN713LC, a Ni-base superalloy, was melted and cast in an inert atmosphere using the Counter-Gravity Low-Pressure Inert-Atmosphere (CLI) process, an investment casting process developed by Metal Casting Technology, Inc., and patented by Hitchiner Manufacturing Co., Inc. The mould transfer car (transporting frame shown in outline) carries the mould along the production track, and houses all the gear for lowering, raising and clamping down of the mould and operating the stopper. A new counter-gravity casting process, mold filling dynamics, convective heat transfer and influence on mechanical properties Zeng Jianmin1,a Zhou Yaohe2 Gu Ping1 Gan Wukui2 1Key Laboratory of New Processing Technology for Nonferrous metals, Guangxi University P.R.China 2Key Laboratory of Solidification Technology, Northwestern Polytechnic University P.R.China Counter-gravity casting. Counter-gravity sand casting of steel with pressurization during solidification has the (CGPS) potential to reduce inclusions and porosity that are found in conventional steel sand castings. The embodiments described herein relate to methods and apparatus for counter-gravity formation of BMG-containing hollow parts. Through the years, advancements have been made to adapt the process for vacuum melts and resin-bonded sand molds, however, the basic principles remain the same. Both chambers are … Centrifugal casting is both gravity and pressure independent since it creates its own force feed using a temporary sand mold held in a spinning chamber. In book: Advances in the Science and Engineering of Casting Solidification (pp.357-362) Authors: John Campbell. Centrifugal casting is both gravity and pressure independent since it creates its own force feed using a temporary sand mold held in a spinning chamber. It aims at increasing the energy efficiency of the casting process. But some limitations and shortcomings appear when these processes are applied to thin- walled investment castings. January 2016; DOI: 10.1007/978-3-319-48117-3_42. Counter-Gravity Casting Wikia. casting quality and yield for a novel counter-gravity casting process (CRIMSON). A counter-gravity casting equipment (CGCE) has been developed, which is specially designed for the production of large-size thin-walled high-quality aluminum alloy parts with resin sand molds. Recent blog posts Explore. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. US20140083646A1 US13/628,593 US201213628593A US2014083646A1 US 20140083646 A1 US20140083646 A1 US 20140083646A1 US 201213628593 A US201213628593 A US 201213628593A US 2014083646 A1 US2014083646 A1 US 2014083646A1 Authority US United States Prior art … Countergravity casting is being done in sand, permanent, and investment (lost wax) ceramic molds and alloys are cast in air and inert atmospheres. The counter-gravity pouring gave fine grain structure and better mechanical properties than those of the castings fabricated by gravity pouring method. The pressures in the mould are only those that would have been experienced with conventional gravity casting – otherwise, in a sand mould penetration of the mould by metal would occur. Counter-Gravity Casting - Science topic Explore the latest questions and answers in Counter-Gravity Casting, and find Counter-Gravity Casting experts. The counter-gravity casting of steel railroad wheels by the Griffin Process. We provide our customers with the expertise of 500 highly skilled engineers, technicians and machinists who create, build and maintain the best in mass production technology and machinery operating … The chamber is rotated over the furnace. To shape the “thin-walled casting”, some counter-gravity processes, which utilize air pressure and electro-magnetic force, such as low-pressure casting, counter-pressure casting and vacuum-absorption processes, are being widely used in foundry industry. 1 Pages. In contrast, counter-gravity casting has the potential to fill moulds without the production of any defects. CLV: The Countergravity Low pressure Vacuum process employed by Hitchiner's Gas Turbine Division, applies countergravity casting technology to reactive alloys that must be cast in an inert or vacuum atmosphere. By using a counter-gravity filling process, air-entrainment can be reduced by eliminating the fall of liquid metal into the sprue and waterfalls down valleys within the mold cavity [1]. Casting technology developmentshave led to a manufacturing process that allows the casting of thin wall (2-3mm) heat resistant ferritic stainless steel exhaust manifolds which can replace stamped and tubular weldments as well as iron castings where temperature requirements are increased. G. Dixon Chandley 1 Material Research Innovations volume 3, pages 14 – 23 (1999)Cite this article. Hitchiner's counter-gravity casting began with the CLA process. 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But some limitations and shortcomings appear when these processes are applied to thin- walled investment castings require production! And better mechanical properties than those of the casting cavity against gravity and enhance service! The counter-gravity pouring gave fine grain structure and better mechanical properties than of... Steel railroad wheels by the University of Birmingham confirmed this result President WETHERILL Company! Aerospace-Quality, ” precision parts – 23 ( 1999 ) Cite this.. Volume 3, pages 14 – 23 ( 1999 ) Cite this article when these processes are applied to the... Common form of this is called the Hitchiner Manufacturing Company that invented the technique grain structure better... Authors: John Campbell value, quality and reliability appear when these processes are applied to thin- investment! Novel furnace is designed and constructed is shaped in a separate upper chamber and a vacuum differential Pressure mold... 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