It aims at increasing the energy efficiency of the casting process. 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. In this case, the dies are machined from graphite. In this equipment, molten metal will be pushed upward counter-gravity into the mold at predetermined rate by compressed air, and solidified at an increased pressure. The hot mold is introduced in a separate upper chamber and a vacuum is created there. The design combines induction skull melting, counter‐gravity casting, and mold heating, which facilitates both filling and microstructure formation via a controllable process. The process started with common steels, was extended to heat resistant superalloys, and recently even titanium alloys are being cast routinely using ceramic crucibles. Metrics details. The counter-gravity casting process involves sealing a gas-permeable mould in the mouth of a vacuum chamber, immersing the underside of the mould in an underlying melt, and evacuating the chamber to draw melt up into the mould through one or more ingates in the bottom thereof. Counter-gravity casting is a process where molten metal is forced into the casting cavity against gravity. Counter-Gravity Casting of IN625 Alloy in Thin-walled Investment Shell Moulds A. Chennakesava Reddy Professor, Department of Mechanical Engineering, JNT University, Hyderabad, India dr_acreddy@yahoo.com Abstract: IN625 alloy is used for high temperature applications. Astrophysical Observatory. Both chambers are … In this case, the dies are machined from graphite. Investment castings require longer production cycles compared to other casting processes. Lead time varies with the application. Counter-Gravity Casting Wikia is a FANDOM Lifestyle Community. But some limitations and shortcomings appear when these processes are applied to thin- walled investment castings. The chamber is rotated over the furnace. Step 1—an operator places a ceramic shell mold, sprue end down, in a mold chamber. 1 Pages. In contrast, counter-gravity casting has the potential to fill moulds without the production of any defects. 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. Made and Manufactured in North America. Counter-Gravity Casting - Science topic Explore the latest questions and answers in Counter-Gravity Casting, and find Counter-Gravity Casting experts. Preview. Use, Smithsonian 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. The design combines induction skull melting, counter‐gravity casting, and mold heating, which facilitates both filling and microstructure formation via a controllable process. Briefly, metal is melted in a vacuum in the lower chamber of the casting machine. 4 Citations. But some limitations and shortcomings appear when these processes are applied to thin- walled investment castings. The purpose of this story is to show how relaxed and safe counter-gravity casting can be. 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. To overcome casting defects and cracks that appear in TiAl castings, a novel furnace is designed and constructed. Add new page. The grain size was measured based ASTM E1382 standard. The embodiments described herein relate to methods and apparatus for counter-gravity formation of BMG-containing hollow parts. It is necessary to have superior control of the pressure inside the vessel in order to achieve the desired results out of the final casted piece. Presented at a meeting held Thursday, March, 4, 1937. Model investigations on test plates by the University of Birmingham confirmed this result. Functional Counter-Gravity™ technology Our five acre property at 458 Dobbie Drive in Cambridge, Ontario Canada is home to our casting facility: the world’s premiere producer of castings. * BY SAMUEL P. WETHERILL, President Wetherill Engineering Company, Philadelphia. Lead time varies with the application. In contrast, counter-gravity casting has the … Counter-gravity filling and pressurization during solidification have been separately shown to improve casting quality in sand cast steel. Counter Gravity Casting. 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. The variation on the gravity pouring technique is to fill the mold using a vacuum. This casting process combines the thin wall and clean metal benefits of the counter gravity, vacuum … The Steps to Counter-Gravity Casting. Abstract: Counter-gravity casting is a process where molten metal is forced into the casting cavity against gravity. The KSM Casting Group manufactures both small, compact components, and very large components in the tilt-mold casting process. Counter-gravity casting of hollow shapes Download PDF Info Publication number US20140083646A1. Ni-base alloys are traditionally melted and cast under vacuum for most investment casting applications. 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. 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. The weighted sum technique was employed to convert this multi-objective optimisation problem to a single objective one. The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative The chamber is rotated over the furnace. The variation on the gravity pouring technique is to fill the mold using a vacuum. 4,340,108 wherein the melt is shaped in a resin-bonded-sand … (or is it just me...), Smithsonian Privacy This aim is to improve shaping capabilities and microstructural control for TiAl castings. Recently Changed Pages. Counter-gravity casting of hollow shapes Download PDF Info Publication number US20140083646A1. January 2016; DOI: 10.1007/978-3-319-48117-3_42. The weighted sum technique was employed to convert this multi-objective optimisation problem to a single objective one. Find Counter Gravity Casting Equipment related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Counter Gravity Casting Equipment information. 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 casting quality and yield for a novel counter-gravity casting process (CRIMSON). No. In book: Advances in the Science and Engineering of Casting Solidification (pp.357-362) Authors: John Campbell. 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. Counter Gravity Casting Campbell, John; Abstract. Historic problems which have impaired success are analysed and solutions presented. Defect and Diffusion Forum Counter-gravity casting is a process where molten metal is forced into the casting cavity against gravity. 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. 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. Counter-gravity casting is a gravity pouring technique that utilizes a vacuum. 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. As in gravity die casting, we can fill the mold and direct the process of solidification of the material by cooling. The counter-gravity pouring gave fine grain structure and better mechanical properties than those of the castings fabricated by gravity pouring method. Investment castings require longer production cycles compared to other casting processes. 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 … A common form of this is called the Hitchiner process after the Hitchiner Manufacturing Company that invented the technique. After Hursen (1955). Counter-Gravity Casting Wikia; Main Page; Videos. Abstract The use of vacuum to fill molds to form investment castings in a countergravity casting fashion was started in the early 1970s. 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. In contrast, counter-gravity casting has the potential to fill moulds without the production of any defects. The counter-gravity casting process involves sealing a gas-permeable mold in the mouth of a vacuum chamber, immersing the underside of the mold in an underlying melt, and evacuating the chamber to draw melt up into the mold through one or more ingates in the bottom thereof. Hitchiner's counter-gravity casting began with the CLA process. Another tendency in the sand foundry art may be viewed as pointing toward counter gravity or pressure versus gravity casting, since it has long been known that down pouring or cascading of molten metal directly into the casting cavity is questionable practice, tending as it does to trap air and allow dirt, dross, or slag to enter the cavity. Components, and very large components in the Science and Engineering of casting Solidification ( pp.357-362 Authors... 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