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economical coring
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Book Chapter
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009019
EISBN: 978-1-62708-187-0
... is usually more economical. The tolerance specified will influence the choice. Advantages Although cores increase cost and tolerance requirements, they enable the foundryman to cast intricate internal shapes not producible by any other process. Examples are curved passages of various kinds and large...
Abstract
Cores are separate shapes, of sand, metal, or plaster, that are placed in the mold to provide castings with contours, cavities, and passages. Cored holes should be designed simply as the intended function of the casting permits. This article describes the designing of casting for the use of sand cores and to eliminate cores, with illustrations. It provides general rules for designing cored holes in investment castings. The article discusses the general principles of coremaking with illustrations. It concludes with a comparison between coring and drilling.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009020
EISBN: 978-1-62708-187-0
... operations in design. The article describes the factors that control casting tolerances and presents specific tips for designing castings with uniform wall thickness, unequal sections, thin sections, economical coring, functional packaging, and core design. The article provides a framework for analyzing all...
Abstract
Casting offers a great amount of component design flexibility. This article discusses six casting design parameters that drive the geometry of casting design from a process standpoint. It provides information on the design of junctions and addresses considerations of secondary operations in design. The article describes the factors that control casting tolerances and presents specific tips for designing castings with uniform wall thickness, unequal sections, thin sections, economical coring, functional packaging, and core design. The article provides a framework for analyzing all manners of manufacturing as possible conversion candidates for casting. It concludes with a discussion on different metalcasting design projects.
Image
Published: 01 December 2008
Fig. 3 An intricately cored value body cast in a shell mold. This shape was economically producible only by the casting process. Cored passages between individual chambers are not visible in the above views.
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Image
Published: 01 December 2008
casting. (See the article “Designing for Economical Coring” for an explanation of the term “drier”.)
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Book Chapter
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009018
EISBN: 978-1-62708-187-0
...) One radius can be incorporated without complicating the core of this hypothetical casting. (See the article “Designing for Economical Coring” for an explanation of the term “drier”.) Bosses and Undercuts Frequently, it is necessary to locate a boss some distance from the parting line...
Abstract
This article begins with a schematic illustration of basic principles of sand molding. It discusses the general design factors, such as parting lines, location of radii, bosses and undercuts, and rib locations, of sand molding. The article schematically demonstrates alternative design solutions to molding and coring problems and describes the molding sequence. Draft refers to the amount of taper given to the sides of a pattern to enable it to be withdrawn easily from the mold. The article concludes with a simple example demonstrating the influence of a casting requirement on the direction of draft.
Image
Published: 01 December 2008
Fig. 17 Coring limitations of permanent mold castings are illustrated by this simple casting. (a) The corner radius of the cored passage must be sacrificed if metal cores are to be used to achieve production at the most economical level. (b) Plaster or sand cores can provide the inside radius
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Image
Published: 01 December 2008
Fig. 23 Coring limitations of permanent mold castings are illustrated by this simple casting. (a) The corner radius of the cored passage must be sacrificed if metal cores are to be used to achieve production at the most economical level. (b) Plaster or sand cores can provide the inside radius
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Image
Published: 01 December 2008
Fig. 30 An improved design that eliminated one core and eight ribs from a sand casting. This resulted in a stronger, more economical part.
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Image
Published: 01 December 2008
Fig. 29 Improved design that eliminated one core and eight ribs from a sand casting. This resulted in a stronger, more economical part.
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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005630
EISBN: 978-1-62708-174-0