Casting


Casting
Casting iron in a sand mold
Judenplatz Holocaust Memorial (Nameless Library), by Rachel Whiteread. Concrete cast of books on library shelves turned inside out.

Casting is a manufacturing process by which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Casting materials are usually metals or various cold setting materials that cure after mixing two or more components together; examples are epoxy, concrete, plaster and clay. Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods.[1]

Casting is a 6000 year old process.[2] The oldest surviving casting is a copper frog from 3200 BC.[2]

Contents

Types

Metal

Metal casting is one of the most common casting processes.

Plaster, concrete, or plastic resin

Plaster itself may be cast, as can other chemical setting materials such as concrete or plastic resin - either using single-use waste molds as noted above or multiple-use 'piece' molds, or molds made of small ridged pieces or of flexible material such as latex rubber (which is in turn supported by an exterior mold). When casting plaster or concrete, the finished product is, unlike marble, unattractive, lacking in transparency, and so it is usually painted, often in ways that give the appearance of metal or stone. Alternatively, the first layers cast may contain colored sand so as to give an appearance of stone. By casting concrete, rather than plaster, it is possible to create sculptures, fountains, or seating for outdoor use. A simulation of high-quality marble may be made using certain chemically-set plastic resins (for example epoxy or polyester) with powdered stone added for coloration, often with multiple colors worked in. The latter is a common means of making attractive washstands, washstand tops and shower stalls, with the skilled working of multiple colors resulting in simulated staining patterns as is often found in natural marble or travertine.

Casting Process Simulation

A high-performance software for the simulation of casting processes provides opportunities for an interactive or automated evaluation of results (here, for example, of mold filling and solidification, porosity and flow characteristics).

Casting process simulation uses numerical methods to calculate cast component quality considering mold filling, solidification and cooling, and provides a quantitative prediction of casting mechanical properties, thermal stresses and distortion. Simulation accurately describes a cast component’s quality up-front before production starts. The casting rigging can be designed with respect to the required component properties. This has benefits beyond a reduction in pre-production sampling, as the precise layout of the complete casting system also leads to energy, material, and tooling savings.

The software supports the user in component design, the determination of melting practice and casting methoding through to pattern and mold making, heat treatment, and finishing. This saves costs along the entire casting manufacturing route.

Casting process simulation was initially developed at universities starting from the early '70s, mainly in Europe and in the U.S., and is regarded as the most important innovation in casting technology over the last 50 years. Since the late '80s, commercial programs are available which make it possible for foundries to gain new insight into what is happening inside the mold or die during the casting process.

See also

Notes

Bibliography

  • Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN 0-471-65653-4 .

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Look at other dictionaries:

  • casting — [ kastiŋ ] n. m. • av. 1972; mot angl. ♦ Anglic. Sélection des acteurs, des figurants, etc. (d un spectacle). Fig. Distribution de rôles (sociaux, professionnels). Il y a quelques erreurs de casting dans ce ministère. Recomm. offic. distribution… …   Encyclopédie Universelle

  • Casting — Cast ing, n. 1. The act of one who casts or throws, as in fishing. [1913 Webster] 2. The act or process of making casts or impressions, or of shaping metal or plaster in a mold; the act or the process of pouring molten metal into a mold. [1913… …   The Collaborative International Dictionary of English

  • Casting — Saltar a navegación, búsqueda Un casting (voz inglesa) es, en teatro, cine, televisión, etc., el proceso de selección de actores, presentadores, modelos y otros cargos similares. Habitualmente, en esta selección todos los candidatos a un trabajo… …   Wikipedia Español

  • casting — CÁSTING s.n. Concurs sportiv în care participanţii au dreptul la un număr de aruncări la ţintă, cu lanseta, într un timp limitat. – Din engl. casting. Trimis de valeriu, 03.03.2003. Sursa: DEX 98  cásting s. n. Trimis de siveco, 10.08.2004.… …   Dicționar Român

  • casting — (izg. kàsting) m DEFINICIJA odabir glumaca i podjela uloga za kazališnu predstavu ili film, odabir manekenki za modnu reviju i sl. SINTAGMA casting manager (izg. casting mènadžer) onaj koji radi i obavlja casting ETIMOLOGIJA engl …   Hrvatski jezični portal

  • casting — (n.) a metal casting, late 14c., from prp. of CAST (Cf. cast) (v.) …   Etymology dictionary

  • casting — ► NOUN ▪ an object made by casting molten metal or other material …   English terms dictionary

  • Casting — Casting. См. Отливка. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • casting — → castin …   Diccionario panhispánico de dudas

  • casting — (del inglés; pronunciamos castin ) sustantivo masculino 1. Área: cine Sesión o sesiones para seleccionar a los actores que intervienen en una producción artística como película, programa de televisión o espot de propaganda: Algunos castings… …   Diccionario Salamanca de la Lengua Española

  • casting — (Voz ingl.). m. Selección de actores o de modelos publicitarios para una determinada actuación …   Diccionario de la lengua española


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