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chemically bonded sand molding

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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005243
EISBN: 978-1-62708-187-0
... Abstract Green sand molding and chemically bonded sand molding are considered to be the most basic and widely used mold-making processes. This article describes the sand system formulation, preparation, mulling, mold fabrication, and handling of green sand molds. It lists the advantages...
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
... of the mold during pouring. The common aggregates used in the aluminum foundry industry are silica, olivine, and zircon sands. The most common binders used are clay, organic, or inorganic chemicals. The possible combination of aggregates and multiple binders makes the sand casting process very versatile...
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
... Abstract Sand mold and permanent mold casting are the major methods for shape casting of steels, with production closely split among green sand, chemically bonded sand, and permanent mold processes. This article describes key aspects of the steel casting process, including steel solidification...
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
... and type of binder depends on the size and number of cores or molds required, production rates, and equipment. Green (clay-bonded) sand molding and chemically bonded sand molding are considered to be the most basic and widely used moldmaking processes. The molding media for the two methods are prepared...
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
... This article summarizes the most important materials in the process of sand casting of cast iron, including different types of molding aggregates, clays, water, and additives in green sand, chemically bonded organic resins, and inorganic binders in self-setting, thermosetting, and gas-triggered systems...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005354
EISBN: 978-1-62708-187-0
....” Additional information on the types of organic and inorganic no-bake systems is also provided in the article “Aggregates and Binders for Expendable Molds” in this Volume. No-Bake Sand Processing Refractory Coatings for Chemically Bonded Sands Refractory coatings or washes are often necessary...
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
... or without flasks (flaskless). Resin-bonded sand mold processes (called cold box, hot box, warm box, and shell molding) were originally based on organic resin binders, although lately even inorganic binders are mixed with the sand and then hardened (or cured) by chemical or thermal reactions to fixate...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003170
EISBN: 978-1-62708-199-3
... to be produced, used for producing molds. Generally, sand is placed around the pattern, and, in the case of clay-bonded sand, rammed to the desired hardness. In the case of chemical binders, the mold is chemically hardened after light manual or machine compaction. Molds are usually produced in two halves so...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006298
EISBN: 978-1-62708-179-5
... composition and mixture molecular weight of the gas evolved within 2 min after pouring metal into phenolic urethane cold box (PUCB) and phenolic urethane no-bake (PUNB) bonded sand molds, as shown in Table 1 . The results in Table 1 show that the binder gas generated during pouring of different alloys...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
... with clay, resins, or silicate compounds. Because sand molds are permeable, the air displaced by the metal when it enters the mold can escape through the mold. Bonded Sand Molds In bonded sand molds, the sand particles are held together with chemical bonds. The bonds that are developed must be easily...
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
... plastic film SAND MOLDING PROCESSES are classified according to the way in which the sand is held (bonded). Most sand casting employs green sand molds, which are made of sand, clay, and additives. Binders are also used to strengthen the cores, which are the most fragile part of a mold assembly...
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
... replica of the final casting. Molds for very large castings are often made from an assembly of chemically bonded sand mold sections (cores) made in numerous core boxes. This is referred to as an all-core mold. In this case, a single pattern is not required; rather, the casting mold is made from multiple...
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
... is usually an organic resin, and it behaves similarly to the resins used to bond sands. The amount of binder used depends on the density and fineness of the refractory. It is used sparingly to avoid casting surface defects. Chemical Modifiers Chemical modifiers to the coating include surfactants...
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
... materials to absorb heat Mold material Ability to absorb heat a, J/(cm 2 °C s 1/2 ) Chromite 0.15 Zircon 0.13–0.15 Quartz sand 0.08–0.12 Olivine 0.10 Chemically bonded urethane molding sand 0.10–0.12 Chemically bonded furan molding sand 0.08–0.10 Chemically bonded shell...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006313
EISBN: 978-1-62708-179-5
... in the mold cavity, on the other hand. Fig. 1 Interactions between the molten iron and the molding aggregate. (a) Physical interaction. (b) Chemical interaction Physical Interaction Because liquid iron does not wet silica, iron cannot penetrate into the voids between the sand grains unless...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006329
EISBN: 978-1-62708-179-5
..., and feeding of molten metal into sand molds. Sand is the dominant mold medium for casting of irons, with green (clay-bonded) sand molding occupying a significant majority (75%) of cast iron parts, followed by 10% by centrifugal casting, 9% by chemically bonded sand molds, and 4% by permanent molds ( Ref 1...
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
... the application of heat. Cores and molds are usually produced in thin sections, often resembling shells of bonded sand ( Fig. 1 ). Fig. 1 Cope side of a shell mold Like any other core or moldmaking process, the shell process has advantages and disadvantages, usually defined by the specific...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005186
EISBN: 978-1-62708-187-0
... application of the process in the modern metal casting age. 1898—Poulson and Hargraves (U.K.) produce the first sand molds bonded with sodium silicate. Germany's Imperial Navy recommends copper-nickel alloys containing 4–45% Ni for saltwater piping system. 1899—Electric arc furnace, developed...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006326
EISBN: 978-1-62708-179-5
... castings can be produced in green sand molds, while large castings are more suited for chemically bonded molds. With production rates of up to 500 molds per hour, green sand molding is one of the most productive manufacturing processes and is well suited for both short and long series of small- to medium...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005334
EISBN: 978-1-62708-187-0
... binder materials used in the modern chemically bonded sands. Automated sand-mixing equipment, with delivery of the sand mix to the point of use, is commonly employed. Molding Sands It is essential to carry out various sand control tests, as described elsewhere, to maintain a consistent sand mix...