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thin-wall investment casting

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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009021
EISBN: 978-1-62708-187-0
... steel sand castings, thin-wall aluminum and magnesium castings, thin-wall permanent mold castings, and thin-wall investment castings, with schematic illustrations. thin-wall investment casting thin-wall permanent mold casting thin-wall steel sand casting thin-wall aluminum casting magnesium...
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
... defects ceramic shells investment casting melting pattern making Investment casting has been used for centuries and is also known as the lost wax process. It is used today to produce near net shape, complex thin-walled castings with smooth surfaces in a reliable and repeatable manner. Small parts...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009022
EISBN: 978-1-62708-187-0
... stages of the design of a casting, padding may be made a functional part of the casting, or it may be located so that its removal adds little or no cost. Consider the two investment castings shown in Fig. 29 and 30 of the article “Design Problems Involving Thin Sections” . For successful production...
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
... of ribs. The presence of a thin core section between two heavier masses of metal presented a problem in production of the turbine door fitting shown in Fig. 8 . Made from magnesium alloy AZ63, this sand casting, as originally designed, had two isolated walls, each 0.38 in. thick, separated from each...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009025
EISBN: 978-1-62708-187-0
... be machined from both the inside and outside surfaces of the T-section. Distortion of a casting can be caused or eliminated by the gating and risering system used in producing the casting. This is demonstrated by the casting shown in Fig. 2 . This thin-wall casting, which was 58 in. long, required...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005265
EISBN: 978-1-62708-187-0
... produced by this process are used in gas turbine engines. Thin-wall components (0.5 mm, or 0.02 in.) previously made as weldments can be produced, thus enabling design freedom for shaped castings that maximize heat transfer, ease assembly, and reduce thermal fatigue. These design improvements often enable...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005299
EISBN: 978-1-62708-187-0
... explains the sand casting and permanent mold casting of steel. The process design and casting of thin sections are also discussed. thin-wall steel castings castability graphite molds induction melting permanent mold castings sand mold castings steels solidification characteristics melting...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009023
EISBN: 978-1-62708-187-0
... required a special cleaning or trimming operation on the rough castings. Cost was the determining factor in the decision to pad and chill, as shown, rather than to add four outside risers. A similar problem, involving a wall too thin to feed adjacent heavier sections, is illustrated by the aluminum...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005244
EISBN: 978-1-62708-187-0
..., and additives used in coremaking. It discusses the curing of compacted cores by core baking and the hot box processes. The article provides an overview of the core coatings, assembling and core setting, coring of tortuous passages, and cores in permanent mold castings and investment castings. It also discusses...
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
... foamed polystyrene patterns are frequently used in conjunction with relatively thin ceramic shell molds (such as the Replicast process). Waxes Wax is the preferred base material for most investment casting patterns, but blends containing only waxes are seldom used. Waxes are usually modified...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009024
EISBN: 978-1-62708-187-0
... is the same. for a thinner section (∼1 in. or 25 mm) as for a thicker section (4 in. or 100 mm). Because, in general, metal in a casting solidifies from the mold surfaces toward the center of a section, thin sections will freeze before heavy sections. Hence, where a thin section is immediately adjacent...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005257
EISBN: 978-1-62708-187-0
... of the mold to form 3 m (10 ft) long pipes with even thickness. Centrifugal heat-resistant steel tube castings rely on a fast pour rate and sufficient pour height to help form the long thin-wall tube before the molten metal gets too cold. Vertical roll casting uses a special-shaped down sprue to prevent...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002449
EISBN: 978-1-62708-194-8
... expansion of the polymer during the baking of the ceramic shell. To solve this problem, the pattern can be built as a thin-shelled honeycomb structure that will burn out without breaking the ceramic mold. This allows parts to be produced from any metal that can be investment cast. It is also possible...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005337
EISBN: 978-1-62708-187-0
... tooling usually requiring draft, and investment casting typically not requiring draft. Tolerances Typically, the major area of concern is true position of a thin-section surface with respect to a datum. Surface areas of approximately 129 cm 2 (20 in. 2 ) or greater in sections of less than...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006327
EISBN: 978-1-62708-179-5
... this process feasible. Investment casting, which is the premier process for producing complex, thin-wall castings. Characterized by highly accurate patterns, strong and stable refractory molds, hot molds, and gravity pouring. A hot mold makes filling thin sections (down to 0.4 mm, or 0.016 in.) easy...
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
... of 1.3 to 3.2 μm (50 to 125 μin.) rms. Suggested tolerances are in Table 6 . Investment casting of aluminum most commonly employs ceramic molds and expendable patterns of wax, plastic, or other low-temperature melting materials. Aluminum investment castings can have walls as thin as 0.40 to 0.75 mm...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001082
EISBN: 978-1-62708-162-7
... will not cause extensive surface or structural deformation. The usual required minimum practical wall thickness for investment castings is 2.0 mm (0.080 in.); however, sections as thin as 1.1 mm (0.045 in.) are routinely made. Even thinner walls may be achieved by chemical milling beyond that required for α...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003176
EISBN: 978-1-62708-199-3
... information on the specification and process of approving foundry sources, which is applicable to castings made from any metal. Designing for progressive solidification requires tapering walls so they freeze from one end to the other; ( Fig. 1 ) and avoiding situations where two heavy sections...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005277
EISBN: 978-1-62708-187-0
..., for example) form so readily that they effectively “getter” the residual oxygen in any contaminated gas or conventional industrial vacuum and form strong films on the surface of the liquid. Rule 2 applies to “normal” castings with walls of thickness over 3 or 4 mm (0.12 or 0.16 in.). For very thin-walled...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005338
EISBN: 978-1-62708-187-0
... that are assembled by welding. In terms of dimensional size, a cast part of 1270 mm (50 in.) in diameter by 1830 mm (72 in.) is generally the maximum for a single pour. Wall thicknesses as thin as 4.75 mm (0.1875 in.) have been produced by the rammed graphite method. One of the largest zirconium castings ever poured...