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Published: 01 December 2008
Fig. 4 Stages of mold production in the V-process. (a) Mold pattern. (b) Pattern placed in a hollow pattern carrier. (c) A thin sheet of plastic film is heated and vacuum fitted to the pattern. (d) Vacuum is applied to shrink wrap thin plastic film around the pattern. (e) The film-covered More
Image
Published: 01 December 2008
Fig. 8 Generalized casting costs versus production quantity for four pattern materials More
Image
Published: 01 December 2008
Fig. 9 Production of a shell mold by the dump-box method in which pattern and dump box are rotated at high speed on a circular track. (a) Rotation. (b) Rollover. (c) Reverse rotation More
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005256
EISBN: 978-1-62708-187-0
... Abstract The Replicast process is developed to overcome the formation of lustrous carbon defects and carbon pickup observed in conventional evaporative pattern casting processes. This article provides a discussion on the pattern production, process capabilities, advantages, and limitations...
Book Chapter

By Robert C. Voigt
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
... processes such as die casting and permanent mold casting. The article reviews the pattern features and mold production considerations used in the pattern design, namely, parting line considerations, addition of gates and risers, core prints, and locating points. It examines the pattern allowances...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005251
EISBN: 978-1-62708-187-0
... Extremely fine sand is vacuum packed around pattern halves. Up to ∼70 kg (150 lb) None ∼3.2 0.125 Prototype or production quantities of 5000–10,000 $3000–14,000 Samples: 2–6 weeks Production: 2–6 weeks after approval Sand castings Treated sand is molded around a wood or metal pattern. The mold...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005219
EISBN: 978-1-62708-187-0
... and melt velocity with high cycling rate. Other tools and patterns require similar maintenance, probably to a lesser degree, depending on production volume requirements. This maintenance will require replacement or refurbishment of nearly worn-out components. This includes features that affect the casting...
Book Chapter

By Robert J. Basso, Paul A. Roy
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003418
EISBN: 978-1-62708-195-5
... Design Tube Rolling Tube rolling can be accomplished by hand or with rolling equipment. Rolling tables such as that shown in Fig. 5 are widely used to make tubular products such as golf shafts, fishing rods, and other tubes up to 9 m (30 ft) in length. The mandrel, with pattern tacked...
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
... of design in terms of size, shape, and product quality. Adding expendable patterns to this equation increases the complexity and tolerance of the cast product. Depending on the size and application, castings manufactured with the expendable mold process and with expendable patterns increase the tolerance...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005188
EISBN: 978-1-62708-187-0
... point, when all other conditions have been satisfied, is to look at the current pattern of production at the metalcasting facility. Important factors can affect prices and quality of the cast part, such as whether or not the metalcasting facility is high volume, casts small components, is a jobbing shop...
Image
Published: 01 December 2008
Fig. 10 Steps in the production of a shell mold by the use of a louver-type dump box. (a) Pattern raised into dump box. (b) Pattern clamped to dump box, and louver retracts to dump sand onto the pattern. (c) Pattern and dump box inverted, and excess sand falls. Louver returns. (d) Original More
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006297
EISBN: 978-1-62708-179-5
... range.” Classification is primarily based on whether the molds and/or the patterns are permanent or nonpermanent. Fig. 1 Classification of molding and casting processes used in cast iron production Aggregate Molding Materials Aggregate molding, or sand casting, is the gravity pouring...
Book Chapter

By Thomas S. Piwonka
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
... to vertical surfaces so that the pattern can be drawn from the mold without scraping the sides of the mold cavity. Fig. 1 Patterns for a sand casting and its gating and risering systems, for four different methods of mold production The choice of pattern material depends on the number of molds...
Book Chapter

By Raymond Donahue, Kevin Anderson
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005254
EISBN: 978-1-62708-187-0
... is discharged and weighed to check density. The density of the foam pattern for a given cast product is critical. For consistent casting results, EPS density must be controlled within ±2% of target density. This is achieved by monitoring and adjusting time and temperature in the preexpander. Once...
Book Chapter

By Charles D. Nelson, Wayne Rasmussen, John Jorstad
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
... at temperatures below 100 °C (212 °F) results in a slow conversion to the dihydrate. In the production of a plaster mold, plaster of Paris is mixed with water in excess of that required to form the dihydrate to make a slurry. This slurry is immediately poured over a pattern, standard or match plate...
Book Chapter

By Kevin Anderson
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
... in the preexpander, the material is discharged and weighed to check density. The density of the foam pattern for a given cast product is critical. For consistent casting results, EPS density must be controlled within ±2% of target density. This is achieved by monitoring and adjusting time and temperature...
Book

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
Book Chapter

By Scott McIntyre
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005252
EISBN: 978-1-62708-187-0
... sections, after production in a two-pattern molding machine, were broken apart at the location of the break strip on the pattern assembly. A core was put in place, and the sections were aligned by means of the locating plugs and glued together. The completed mold was placed flat on the sand in a pouring...
Book Chapter

By Robert A. Horton
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005255
EISBN: 978-1-62708-187-0
... combined with practical evaluation under such production-like conditions as injection behavior, handling characteristics, dimensional consistency, and dewaxability. Plastics Next to wax, plastic is the most widely used pattern material. A general-purpose grade of polystyrene is usually used...
Book Chapter

Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003433
EISBN: 978-1-62708-195-5
.... The thermomechanical properties of tooling materials have evolved such that they more closely match those of the production part to be fabricated. In addition to improvements in materials properties, today's tooling materials offer lower fabrication and materials costs. The advancements in CADCAM models have also...