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expendable molds

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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005242
EISBN: 978-1-62708-187-0
... Abstract This article reviews the basic types of mold aggregates and bonding methods for expendable molds and coremaking. It provides an overview of mold media and the basic types of sands and their properties. The most significant clays used in green sand operations, such as bentonites...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005253
EISBN: 978-1-62708-187-0
... Abstract Depending on the size and application, castings manufactured with the expendable mold process and with expendable patterns increase the tolerance from 1.5 to 3.5 times that of the permanent pattern methods. This article reviews the two major expendable pattern methods, such as lost...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005241
EISBN: 978-1-62708-187-0
... Abstract Casting can be done with either expendable molds for one-time use or permanent molds for reuse many times. This article lists the various methods used to fabricate expendable molds from permanent patterns. The methods include molding of sand with clay, inorganic binders, or organic...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009015
EISBN: 978-1-62708-187-0
... Abstract This article provides a general introduction on casting processes and design techniques. It discusses the process steps and methods of the main categories of shape casting methods, namely, expendable molds with permanent patterns, expendable molds with expendable patterns, and metal...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005308
EISBN: 978-1-62708-187-0
... Abstract This article discusses the types of patterns used for a specific application such as loose patterns, match plate patterns, cope and drag patterns, and special patterns. It describes the principles of the patternmaking techniques used to make expendable molds and for metal casting...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005258
EISBN: 978-1-62708-187-0
... information on expendable and permanent molds used for centrifugal casting. The parameters and operations of the horizontal centrifugal casting process, including pouring and solidification, as well as the applications are described. horizontal centrifugal casting solidification flanged shaft machine...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005187
EISBN: 978-1-62708-187-0
.... Shape casting processes ratings chart Table 1 Shape casting processes ratings chart Mold method Capabilities Applicable metals Productivity (a) Disposable cores Casting size Dimensional control Expendable mold with permanent patterns  Bonded sand processes   Green sand...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005287
EISBN: 978-1-62708-187-0
...-pressure or gravity-fed permanent mold castings, which are more sound in spite of slower cooling. Expendable Mold Methods Sand casting is the major type of expendable mold method. The advantages of typical sand casting are versatility in a wide variety of alloys, shapes, and sizes. Alloys considered...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006513
EISBN: 978-1-62708-207-5
... the use of permanent mold casting, production volume is a major factor, because permanent-mold tooling is typically more expensive than that for sand casting and other expendable-mold processes. Machined molds, typically made of nodular iron, cast steel, and wrought steel, can be reused repeatedly until...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002481
EISBN: 978-1-62708-194-8
... into two groups ( Fig. 5 ): expendable-mold and permanent-mold processes. Choice of process and mold material is greatly influenced by the melting point of the alloy. A vital issue is avoidance of voids (due to insufficient feeding of melt) and porosity (due to dendritic solidification and the presence...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006508
EISBN: 978-1-62708-207-5
... cycle from mold filling to fusion, cooling, and part ejection. The article also provides information on casting quality, discussing dimensional tolerances, fold defects, and porosity. expendable pattern casting fold defects lost foam casting porosity sand casting Introduction Lost foam...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
... are permanent or expendable. Similarly, subclassifications can be developed from patterns, (i.e., whether or not the patterns are expendable). For permanent molding, processes can be classified by the type of mechanism used to fill the mold. Table 1 provides one possible classification system for commonly...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.9781627082075
EISBN: 978-1-62708-207-5
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003127
EISBN: 978-1-62708-199-3
... cavities, and collapsible metal cores are used to form internal ribs and undercuts, which also can be formed by expendable (dry sand or plastic) cores. When the latter are used, the process is referred to as semi-permanent mold casting. Mechanical properties (including fatigue resistance) of permanent mold...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006519
EISBN: 978-1-62708-207-5
... on a casting produced in a monolithic mold. Investment casting uses an expendable/disposable pattern, typically made of wax and then coated with some type of slurry molding medium. The wax positive shape of the part is usually made from tooling mounted in some type of wax injection machine ( Fig. 1 ) ( Ref...
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
... molding. With sand or plaster cores, which are expendable, more complex shapes can be produced than with metal cores. The two cored passageways shown in Fig. 17 illustrate the limitations of cores in permanent mold castings. The cored passageway shown in Fig. 17(a) could be produced with metal...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005261
EISBN: 978-1-62708-187-0
... of a wheel. Fig. 8 Low-pressure wheel mold with four moving side cores to create the external geometry of a wheel The low-pressure process can also accommodate semipermanent molds, where cores can be expendable sand, shell, or plaster. The incoming metal velocity in low pressure is slow...
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
... casting, these molding principles are equally valid. In die casting and investment casting, metal dies and cores are used. In permanent mold casting, metal molds are used with either expendable or metal cores; with expendable cores the process is referred to as semi-permanent molding. When four...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006533
EISBN: 978-1-62708-207-5
... molding, vertically parted molding, and three-dimensional (3-D) printing, have improved the productivity and complexity of sand molds ( Ref 1 ). Molten metal is poured into the mold, which is destroyed once the casting has solidified. Sand casting is one of the many processes that use expendable molds...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005249
EISBN: 978-1-62708-187-0
... of the metals that can be cast and mold materials are given in the article, along with details of versions of the two processes. Both processes use expendable molds, and mold materials are not fully reclaimable; thus, mold costs tend to be high. Still, slurry processes are cost-effective, especially for high...