Reinforcement For Mold Material Patents (Class 164/411)
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Patent number: 8844897Abstract: Devices may be in contact with molten metals such as copper, for example. The devices may include, but are not limited to, a die used for producing articles made from the molten metal, a sensor for determining an amount of a dissolved gas in the molten metal, or an ultrasonic device for reducing gas content (e.g., hydrogen) in the molten metal. Niobium may be used as a protective barrier for the devices when they are exposed to the molten metals.Type: GrantFiled: March 4, 2009Date of Patent: September 30, 2014Assignee: Southwire Company, LLCInventors: Victor F. Rundquist, Kevin S. Gill
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Patent number: 7284589Abstract: Sacrificial lost casting cores of green or fired ceramic, which include at least one tension spring as a metallic reinforcing element, wherein at least one end of this reinforcing element lies near one of the surfaces of the casting core or extends therethrough, and wherein the melting point of all metallic reinforcing elements lie above the melting point of the casting metal, as well as processes for production of such casting cores, including the steps of preparing a principal mold, seating therein at least one reinforcing element, filling the principal mold with ceramic slip, drying the slip for formation of a green ceramic and releasing the casting core from the principal mold. The principal mold is preferably lined with a flexible internal mold or liner. The reinforcing element in the form a tension spring can be used following casting for breaking up the ceramic casting core.Type: GrantFiled: July 21, 2004Date of Patent: October 23, 2007Assignee: DaimlerChrysler AGInventors: Rolf Pfeifer, Ralf Lebbing, Jialin Shen
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Patent number: 6868892Abstract: There is provided a ceramic fiber casting core used in making cast metal parts comprised of a ceramic fiber structure. The casting core may further comprise a support tube in structural supporting relation to the ceramic fiber structure. There is also provided a method to manufacture the ceramic fiber casting core that comprises mixing ceramic fibers and a binder in a mix tank. Pouring the resultant mixed slurry into a vacuum forming tank. Inserting a perforated mandrel into the vacuum forming tank. Forming a vacuum inside the mandrel resulting in vacuum depositing of the ceramic fiber on the mandrel. Removing the ceramic fiber casting core and mandrel from the vacuum forming tank. Removing the mandrel, and then drying and curing the ceramic fiber structure. When necessary, locating a support member in structural supporting relation to the ceramic fiber structure. Machining the unfinished casting core to a desired outside dimensions.Type: GrantFiled: December 10, 2002Date of Patent: March 22, 2005Assignee: International Engine Intellectual Property Company, LLCInventors: Larry C. Kimbrough, Keith R. Gardner
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Publication number: 20040238158Abstract: The invention relates to investment casting shell molds and their method of manufacture. The method entails mixing fiber such as ceramic refractory fiber and organic fiber with ceramic filler to form a dry blend. The dry blend is mixed with a binder sol such as colloidal silica sol to form slurry. An expendable preform is dipped into the slurry, stuccoed and dried. This step is repeated until a ceramic shell of a desired thickness is formed over the expendable preform. The expendable preform then is removed, and the green ceramic shell is fired. Molten metal then may be poured into the shell to form a metal casting.Type: ApplicationFiled: December 30, 2003Publication date: December 2, 2004Applicant: Buntrock Industries, Inc.Inventors: John Vandermeer, Kermit A. Buntrock, Thomas M. Branscomb, Arlen G. Davis
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Patent number: 6568458Abstract: A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.Type: GrantFiled: October 30, 2001Date of Patent: May 27, 2003Assignee: Howmet Research CorporationInventors: Rajeev V. Naik, John Corrigan
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Patent number: 6467534Abstract: A ceramic casting shell mold having a pre-selected shape comprises alternate, repeating layers of a ceramic coating material and a ceramic stucco, defining a total thickness of the shell mold; and a ceramic-based reinforcing sheet disposed in the alternate, repeating layers of coating material and stucco at an intermediate thickness. The ceramic-based reinforcing sheet comprises a one-piece monolithic, integral body, which comprises a pattern of holes that enhance bonding between the ceramic-based reinforcing sheet and adjacent ones of the alternate, repeating layers of ceramic coating material. The ceramic-based reinforcing sheet conforms to the shape of the mold and providing structural reinforcement to the mold.Type: GrantFiled: April 5, 2000Date of Patent: October 22, 2002Assignee: General Electric CompanyInventors: Frederic Joseph Klug, Michael Francis Xavier Gigliotti, Jr., Wayne David Pasco, Paul Steven Svec
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Publication number: 20020134526Abstract: A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.Type: ApplicationFiled: October 30, 2001Publication date: September 26, 2002Applicant: Howmet Research Corporation.Inventors: Rajeev V. Naik, John Corrigan
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Patent number: 6431255Abstract: A ceramic casting shell mold having a pre-selected shape is described. It includes alternate, repeating layers of a ceramic coating material and a ceramic stucco, defining a total thickness of the shell mold; and a ceramic-based mat of reinforcing material disposed in the alternate, repeating layers of coating material and stucco. The reinforcing material for the mat is usually made from a ceramic material, and includes fibers having a bi-directional orientation. A method for making a ceramic casting shell mold is also described, as well as articles cast from such a mold, e.g., superalloy articles.Type: GrantFiled: July 14, 1999Date of Patent: August 13, 2002Assignee: General Electric CompanyInventors: Asish Ghosh, Robert Arthur Giddings, Frederic Joseph Klug, Paul Steven Svec, Philip Harold Monaghan
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Publication number: 20020084057Abstract: A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.Type: ApplicationFiled: October 30, 2001Publication date: July 4, 2002Applicant: Howmet Research CorporationInventors: Rajeev V. Naik, John Corrigan
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Patent number: 6364000Abstract: A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.Type: GrantFiled: September 23, 1997Date of Patent: April 2, 2002Assignee: Howmet Research CorporationInventors: Rajeev V. Naik, John Corrigan
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Patent number: 6349759Abstract: To form a mold for casting a metal article, metal pins are inserted through a pattern. End portions of the metal pins are bent after the pins have been inserted through the pattern. The pattern and opposite end portions of the metal pins are then covered with wet ceramic mold material. A mold structure is formed by drying the wet ceramic mold material. The pattern is then removed from the mold structure to leave a mold cavity with the metal pins extending through the metal cavity between opposite side sections of the mold structure. Molten metal is conducted into the mold cavity and force is transmitted between opposite side sections of the mold structure through the metal pins to retard movement between the side sections of the mold structure. The molten metal is solidified in the mold cavity and a metallurgical bond is formed between the metal in the mold cavity and the metal pins. The cast article is then removed from the mold structure. The cast article has a thin wall section with a thickness of 0.Type: GrantFiled: April 5, 1999Date of Patent: February 26, 2002Assignee: PCC Airfoils, Inc.Inventor: Harold L. Wheaton
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Patent number: 6283194Abstract: A process for producing structural elements, preferably prototypes, in which a “lost” model, i.e., positive model, of the structural element is produced in a first step and the model is subsequently cast with a molding compound to produce a negative mold. The mold is then used for manufacturing the structural element, preferably a prototype, by casting. The model is cast and/or filled with the molding compound in a plurality of successive steps and the position of the model relative to a reference plane is changed in each of the individual steps of casting or filling.Type: GrantFiled: January 12, 1999Date of Patent: September 4, 2001Assignee: Grunewald GmbH & Co. KGInventors: Jörg Stefan Detering, Christian Grunewald
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Publication number: 20010009182Abstract: A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.Type: ApplicationFiled: September 23, 1997Publication date: July 26, 2001Inventors: RAJEEV V. NAIK, JOHN CORRIGAN
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Patent number: 6206082Abstract: A molding machine for producing a mold by applying external force of either pressurized air or mechanical compaction or both to molding sand (12) that is held in a mold space is disclosed. The mold space is defined by a master plate (9), which has a pattern (8), and a flask (7). The molding machine includes a lifter table (11) for vertically carrying the master plate (9) and the flask (7), a filling frame (4) disposed for vertical movement above the lifter table (10), and a reinforcing frame (5) disposed for vertical movement between the filling frame (4) and the lifter table (10). The reinforcing frame (5) and the flask (7) are adapted to approach each other such that the reinforcing frame (5) contacts the outer surface of the flask (7) to reinforce it.Type: GrantFiled: April 22, 1998Date of Patent: March 27, 2001Assignee: Sintokogio, Ltd.Inventor: Masamoto Naito
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Patent number: 6029736Abstract: A reinforced core for use in metal casting processes, especially directional solidification casting processes, comprises an elongated, thin-walled outer quartz or silica rich tubular member and a carbon base reinforcement disposed in and extending along a length of the tubular member. The carbon base reinforcement can comprise one or more graphite rods cemented together in end-to-end relation or a carbon fiber bundle. The carbon base reinforcement can include an outer carbide surface region by coating or surface reaction.Type: GrantFiled: August 29, 1997Date of Patent: February 29, 2000Assignee: Howmet Research CorporationInventors: Rajeev V. Naik, John Corrigan
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Patent number: 4978053Abstract: A band-like plate is bent until both ends of the plate meet with each other, and then both ends of the plate are joined by welding so as to make a loop. A pair of first and second inner dies are placed inside the loop while a pair of first and second outer dies are placed outside the loop. The loop is held by the inner and outer dies. At the same time or after that, the loop is pressed by the inner dies when the first and/or second dies move in a given direction.Type: GrantFiled: November 17, 1989Date of Patent: December 18, 1990Assignees: Kabushiki Kaisha Ohsawa Engineering, Toshiba Ceramics Co., Ltd.Inventor: Sueo Ohsawa
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Patent number: 4532974Abstract: A reinforced tubular core for casting gas turbine engine blades with cooling air passages therein is disclosed. A method of casting is also disclosed in which the blades are directionally solidified to produce columnar grained or single crystal blades and in which non-linear passages can be produced. The problem in producing such articles is that the moulds and cores used in the casting process are held at temperatures in excess of 1500.degree. for long periods and presently used silica cores deform during the process. Stronger cores of alumina or silicon nitride cannot be easily bent were believed to be non-leachable from the casting. The present invention provides a core having a tubular silica sheath with a solid alumina rod inside it for support. The sheath can be bent and the straight alumina rods can be inserted from opposite ends of the sheath.Type: GrantFiled: June 30, 1982Date of Patent: August 6, 1985Assignee: Rolls-Royce LimitedInventors: David Mills, Anthony T. Lindahl, Alan D. Kington
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Patent number: 4351098Abstract: This invention relates to a method for reinforcing and repairing cast iron molds by surrounding the mold with a closely fitted steel plate or plates, connecting the ends of the steel plate or plates to form a continuous band, attaching the continuous band to the cast iron mold and locating spacers between the cast iron mold and the continuous band to elevate the band from the cast iron mold wall surface. This invention further relates to a method for reducing shear stress on the means by which the continuous band is attached to the mold by locating the means of attachment around a corner from the source of stress at an obtuse angle to the mold wall being reinforced.Type: GrantFiled: June 11, 1980Date of Patent: September 28, 1982Inventor: Glenn W. Hanna
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Patent number: 4139934Abstract: The invention relates to floats and to a process for manufacturing floats for the continuous casting of metal alloys and particularly aluminum and alloys thereof, said floats being formed by assembling machined parts of compressed panels of alumino-silicate ceramic fibers having a voluminal mass above 0.45 g/cm.sup.3, in which the surfaces which come into contact with the molten metal alloy are coated with a suspension of metallic oxides in a mineral hardener.Type: GrantFiled: November 9, 1977Date of Patent: February 20, 1979Assignee: ServimetalInventor: Robert Bayard
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Patent number: 4044815Abstract: A precision investment casting ceramic mold of the self-casting type is made as a unitary mold by providing separately a pattern for a wax charge-holding assembly and a pattern for a wax article casting assembly, each including an alignment portion. The two patterns are secured together at the alignment portions and are supported and located one with respect to the other by a plurality of supporting and locating members. The assembled patterns then are used in the conventional manner to make a ceramic casting mold.Type: GrantFiled: November 1, 1976Date of Patent: August 30, 1977Assignee: General Electric CompanyInventors: Russell W. Smashey, Dwight O. Bartell