Pattern (casting) - Factbites

Pattern (casting) - Factbites
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Topic: Pattern (casting)

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	Chill-enhanced lost foam casting process - Patent 4520858
		In a lost foam metal casting process, a refractory coated vaporizable polymeric pattern is embedded in a mold formed of unbonded refractory particles, i.e., sand, and is decomposed and replaced by molten metal.
		The only FIGURE is a cross-sectional view of a foundry apparatus for casting metal by a lost foam process and showing a fugitive pattern in combination with a chill member for reducing regional porosity in accordance with this invention.
		Pattern 10 is composed of low density polystyrene foam that vaporizes substantially without residue at aluminum casting temperatures and may be formed in any suitable fashion, for example, by molding preexpanded polystyrene beads or by glueing premolded polystyrene sections together.
	freepatentsonline.com /4520858.html (3418 words)

	Investment Casting
		During investment casting both the pattern and the mold are destroyed.
		With flask casting the pattern in invested upside down in a canister filled with a refractory ceramic material, which is allowed to harden around the pattern.
		Investment casting may be called the lost wax process because of its unique way of creating artifacts, but it was also for a long time a lost process.
	www.bsu.edu /web/llmorford/investcast.html (3418 words)

	Untitled
		Patterns in sand casting are typically made out of wood, plastic, or metal (since pattern material dictates pattern life, its selection depends on the volume of production).
		The produced castings and the patterns are then evaluated for their critical dimensional accuracy and costs.
		LOM is the most common application used for pattern making for very large casting sizes.
	www.uni.edu /~rao/rt/casting.htm (3418 words)

	Metal Technologies; An Explanation of Sand Casting
		The pattern is a replica of the exterior of the casting with dimensional allocation for shrinkage and finishing.
		The number of castings to be made from the mold and the specifications required of the finished casting are two of the criteria that determine which material is selected for the creation of the pattern.
		After the pattern is removed, gating and runner arrangements are positioned in the drag half of the mold cavity and the sprue is placed the cope portion.
	www.metal-technologies.com /sand.asp (3418 words)

	Sand Casting of Metals
		Sand, mixed with some form of binder, is placed around the pattern and compacted to the point that it will hold the cavity shape when the pattern is removed Molten metal may then be poured directly into this open cavity, or it may be poured through passageways if the cavity is closed.
		Riddled sand will fall through gravitational forces through the screen into a container (or a pit) and may be considered ready for ramming although a hand riddle (having a finer screen) is typically used as a final filter as sand is being poured onto the pattern.
		Casting, in our case, is the process of pouring molten metal into a mold cavity, formed of sand, to produce a near net shape metal object.
	oak.cats.ohiou.edu /~dw120996/esp/sand_casting_of_metals.htm (3418 words)

	Sand Casting: Introduction
		In a two-part mold, which is typical of sand castings, the upper half, including the top half of the pattern, flask, and core is called cope and the lower half is called drag.
		The processes of sand casting are discussed in this section, include patterns, sprues and runners, design considerations, and casting allowance.
		The purpose of this is feed the molten metal to the mold cavity as the molten metal solidifies and shrinks, and thereby prevents voids in the main casting.
	www.efunda.com /processes/metal_processing/sand_casting_intro.cfm (3418 words)

	Sand Casting: Introduction
		In a two-part mold, which is typical of sand castings, the upper half, including the top half of the pattern, flask, and core is called cope and the lower half is called drag.
		The processes of sand casting are discussed in this section, include patterns, sprues and runners, design considerations, and casting allowance.
		See the casting allowance table for the approximate shrinkage allowance expressed as the Pattern Oversize Factor.
	www.efunda.com /processes/metal_processing/sand_casting_intro.cfm (612 words)

	General Foundry - Sand Casting, Rubber Plaster Molding, Investment Casting
		Investment Casting is a process in which a ceramic mold is created around a wax or plastic pattern.
		Precision Sand Casting employs fine sand to construct mold halves around a wood, plastic, or cast aluminum matchplate (positive).
		The mold is broken and the casting(s) removed, cleaned, and straightened.
	www.genfoundry.com /services.html (612 words)

	Investment Casting
		With flask casting the pattern in invested upside down in a canister filled with a refractory ceramic material, which is allowed to harden around the pattern.
		Investment casting may be called the lost wax process because of its unique way of creating artifacts, but it was also for a long time a lost process.
		Once the sprueing system is designed and attached the pattern(s) will be invested in slurry and refractory particles.
	www.bsu.edu /web/llmorford/investcast.html (612 words)

	Lost Foam
		The Lost Foam Casting process is a cavity-less casting method, using a polystyrene foam pattern imbedded in traditional green sand.
		The polystyrene foam pattern left in the sand is decomposed by the molten metal.
		The balance of the casting cleaning operations (cut-off, grind, shot blast, etc.) are similar to other casting processes.
	www.ctiparts.com /lost_foam.htm (335 words)

	UAB Casting Engineering Laboratory
		Inconsistent pattern coatings produce inconsistent metal-pattern exchange rates which result in casting defects.
		A consortium of casting producers, users, and foundry suppliers was formed in 1989 to develop an engineering understanding of the Lost Foam Process and solve some of the common defects.
		Lost foam casting can produce dimensionally accurate and precise castings, but it can also, without proper control and attention to detail, produce warped, distorted, and defective castings.
	www.eng.uab.edu /mse/labs/cel/about/research/lostfoam/default.asp (654 words)

	colored.htm
		Now, in the nines-pattern, we find that the digital root of a "decimal" number is conserved by the transformations of summing its digits; by the transformations of casting out 9's; by the transformations of permuting its digits; by the transformations of dividing by 9.
		The codigital root of a "decimal" number is conserved by the transformations of alternate-sum of digits; the transformations of casting out 11's; the transformationsof dividing by 11.
		Children also experiment with eight-grids ("octal" numeration in computer science), wherein sevenness assumes the diagonal pattern of nines in ten-grids; nineness assumes the counterdiagonal pattern of elevens in ten-grids -- because seven and nine are immediate neighbors of eight (as are nine and eleven for ten).
	members.fortunecity.com /jonhays/colored.htm (1277 words)

	Sand Casting
		Parting powder - a dust, powdery substance that prevents the pattern, and flasks from sticking to the sand and to each other.
		Casting sand or greensand is home made and is composed of silica sand, Bentonite clay, and water.
		Molten aluminum is poured into a "green sand" mold, to reproduce the the pattern.
	mypeoplepc.com /members/waygat/castingfoundrylathe/id3.html (1277 words)

	Metal casting: Sand casting process, investment casting, rubber plaster molding
		Investment Casting Process This process is known as lost-wax casting because the wax pattern is "lost" when the ceramic shell is heated.
		Sand Casting Process Moist-bonded or resin-coated sand is packed tightly around a pattern.
		The sand casting process is one of the most affordable methods of creating a metal casting.
	www.vistatek.com /capabilities_casting.html (1277 words)

	Chp. 10: Overview Of The Investment Casting Process
		The investment casting process begins with fabrication of a sacrificial pattern with the same basic geometrical shape as the finished cast part (Fig.
		Patterns are normally made of investment casting wax that is injected into a metal wax injection die.
		Investment casting, often called lost wax casting, is regarded as a precision casting process to fabricate near-net-shaped metal parts from almost any alloy.
	www.wtec.org /loyola/rp/10_01.htm (1277 words)

	Rapid prototyping for investment casting
		Investment casting, also known as the "lost wax" process, consists of attaching an expendable pattern (usually wax, and for our purposes generated via rapid prototyping) to a tree which acts as its sprue, then repeatedly dipping the pattern into a stucco light slurry.
		With the advancements in rapid prototyping, investment casting has become the leading technology for producing high-quality castings quickly and inexpensively.
		A major advantage to investment casting is that either ferrous of nonferrous materials can be used.
	www.vistatek.com /capabilities_mc_icp.html (1277 words)

	Glossary Of Casting Terms
		LOST WAX CASTING: When a wax model is surrounded by an investment slurry which hardens to form a mold, the mold is heated during burnout and the wax pattern melts away and is "lost".
		DENSE CASTING: A casting that is highly compressed and with a minimum of porosity.
		This effect can be caused by sharp corners and bends in the sprue system or pattern, flask may have been placed in furnace with insufficient setting time, flask may have been heated too quickly or the invested flask had been moved during bench-set.
	members.aol.com /thecastingroom/glossaryandterms.html (1277 words)

	LAB# 6 ALUMINUM SAND CASTING
		After positioning the sprue and the open riser, the flask for the cope is placed on top of the drag and parting powder once again sprayed uniformly over the pattern and the inserts for the sprue and open riser.
		It is the casting of material into molds made in sand, with the intention of having the casting itself pick up a layer of sand on the surface.
		After the removal of the sprue and open riser inserts, the plane wooden board is used to cover the Exposed surface, then the cope is turned upside down to expose the side with the pattern 13.
	www.eng.morgan.edu /~cberry/IEGR363/lab_6.html (1277 words)

	Investment casting
		Investment casting begins with the formation of an expendable pattern - usually formed from wax through injection of liquid wax into a pattern die.
		As previously mentioned, one of the principle advantages of the investment casting process is its ability to produce near net shape components.
		The investment casting or lost wax process has been utilised through history for some 5000 years, principally for the production of ornamental objects, statues and jewellery.
	www.foseco.com.au /foundry/invest/info.htm (1277 words)

	Casting aluminum flasks
		I've seen flasks that were cast from patterns made from Styrofoam in the "lost foam" process but it seems like a lot of work to make a pattern for only one use.
		I also have a 5" X 6" flask pattern but it was built after this photo was taken.
		The flask is used while it's standing upright in a vertical position and the metal is actually poured through a "spout" passing through the top wall of the flask.
	www.backyardmetalcasting.com /alumflasks01.html (1277 words)

	Metal Technologies; Metal Casting Terms & Definitions
		Bedding in: Sinking a pattern in to the sand by excavating a "bed" in which the pattern is placed for ramming up.
		Please select a range of terms from the menu at the left for listings of common metal casting terms and definitions.
		Metal Technologies Group has compiled a small glossary to help you familiarize yourself with the language of metal casting.
	www.metal-technologies.com /terms.asp?r=ab (1277 words)

	Lost Foam Casting
		This is the pattern for a sand casting flask.
		The foam pattern is softly rammed in casting sand.
		Both samples were cast side-by-side in loose sand blasting sand and poured at 1400F.
	www.ray-vin.com /casting/lostfoam/lostfoam.shtml (1277 words)

	Aluminum and Magnesium Sand Castings - Pattern Manufacturing - Prototype Development - Israeli Manufacturer - Tirosh-Casting
		The range of activities includes pattern manufacturing, prototype development and serial casting and machining production.
		Aluminum and Magnesium Sand Castings - Pattern Manufacturing - Prototype Development - Israeli Manufacturer - Tirosh-Casting
		The company is ISO 9000-2000 certified, and a full-service supplier to the defense, hi-tech and aerospace industries in Israel and around the world.
	www.tirosh-casting.com (110 words)

	Sand Casting
		Description: Tempered sand is packed onto wood or metal pattern halves, removed from the pattern, and assembled with or without cores, and metal is poured into resultant cavities.
		Request one of our Free Casting Wall Charts.
		Production: 2-4 weeks A.S.A. Back to the Talbot Associates Casting Page.
	www.metalbot.com /sand.html (110 words)

	Cunningham Service 2
		Our skilled pattern makers and casting engineers will complete a mold study based on casting design and requirements, using 3D modeling they will draft, part, calculate shrinkage, complete solidification models, gate and riser each casting design.
		efficiently (in various forms) to create tooling capable of supporting the casting process requirements, from proof of concept parts to full production parts in most ferrous and non-ferrous alloys.
		After machining final rigging of core boxes and patterns is completed for delivery to the customer.
	www.cunn.com /serv02.htm (110 words)

	The Four Winds Collection - The Lost Wax Bronze Process
		The wax casting is removed from the mold, and a trained artisan hand-finishes the wax pattern to original perfection.
		Wax rods, called gates, are attached to the wax pattern to allow the even flow of molten metal and to alleviate the trapping of air and gas.
		It should be realized that this total casting process takes several weeks from start to completion.
	www.classicbronze.com /process.html (110 words)

	The Lost-Wax Casting of Icons, Utensils, Bells, and Other Items in South India
		The fettled castings of the child Krishna and a banyan tree leaf are shown in Figure 4.
		To strengthen the wax pattern as well as to facilitate the flow of molten metal into various parts, a few wax cross strappings and a wax rod ending with a funnel shape (sprue and runner) are also joined to the pattern at appropriate locations.
		During the clay-coating application, the wax model is kept on a piece of paper or cloth on the floor or a table, depending upon the size of the model, to avoid its deformation.
	www.tms.org /pubs/journals/JOM/0210/Pillai-0210.html (110 words)

	Feature Article - Cast In FOAM - 03/03
		The lost foam method begins with Styrochem-supplied polystyrene beads (type T170B), which look like white sand granules in their pre-expanded state, and are placed into one of six Styrologic pre-expanders for wet expansion (five of the units operate 24 hours/day) before entering a seven-step pattern making process.
		Lost foam patterns are created from slices of the final part, with the slices glued together to create a complete component.
		GM’s Saginaw Metal Casting Operations (SMCO) currently casts the iron blocks for the 3800 V6 and Gen 3 V8, and the aluminum heads for the Gen 3 V8 and both the block and head for the Vortec inline six.
	www.autofieldguide.com /articles/030304.html (1107 words)

	Lost Foam Casting
		This is the pattern for a sand casting flask.
		The foam pattern is softly rammed in casting sand.
		Both samples were cast side-by-side in loose sand blasting sand and poured at 1400F.
	www.ray-vin.com /casting/lostfoam/lostfoam.shtml (1107 words)

	WHAT DOES LOST WAX CASTING MEAN
		This duplicate wax pattern is cleaned and re-detailed so it is virtually as good as the original wax pattern.
		The wax is "burned out" in a kiln at 1250° F (orange hot), so that it goes up in smoke and leaves its impression in the ceramic.
		Hence the term "Lost Wax" because the wax is gone.
	www.castofcharacters.com /lostwax.htm (1107 words)

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