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transfer molding

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003020
EISBN: 978-1-62708-200-6
... Abstract Resin transfer molding (RTM) and structural reaction injection molding (SRIM) are two similar processes that are well suited to the manufacture of large, complex, and high-performance structures. This article discusses the similarities and differences of RTM and SRIM processes and the...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005423
EISBN: 978-1-62708-196-2
... Abstract A key aspect of solidification process modeling is the treatment of the interface between the solidifying casting and the mold in which it is contained. This article begins with information on casting-mold interface heat-transfer phenomena. It describes practical considerations and...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005352
EISBN: 978-1-62708-187-0
... molds Tundishes, which are intermediate holding vessels that have the ability to regulate molten-metal flow using slide gates, sliding nozzles, or a stopper Holding furnaces or transport crucibles that maintain a melt (or superheat) over a period of time Molten-metal transfer pumps Teeming...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003034
EISBN: 978-1-62708-200-6
.... Bulk molding compounds are processed by compression, transfer, and injection molding. Compression molding is used for large parts and wherever strength is critical to a molded part. This molding method causes the least amount of damage to reinforcing fibers, and in some cases the orientation of the...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003014
EISBN: 978-1-62708-200-6
... condition are formed by transferring them into an open mold, which is then forcibly closed. This latter process is fully discussed in the article “Compression Molding and Stamping” in this Volume. The injection molding process generally has the advantages, first, of being more readily automated and...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003017
EISBN: 978-1-62708-200-6
... production costs. In the basic four-step process, shown in Fig. 1 , a hollow, thin-wall mold with good heat transfer characteristics is first charged with an amount of plastic (in either liquid or dry powder form) that is equal to the desired part weight. The mold is then attached to a mechanism that...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003019
EISBN: 978-1-62708-200-6
... molding heat transfer analysis techniques to maximize the heat transfer characteristics of the tool ( Ref 4 ). Extra sets of tooling are expensive and introduce variance in part tolerance when a number of parts must be assembled from moldings of several tools. It is therefore advantageous from several...
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
... specific metal-casting application. The most common perceived disadvantage is that the process is slow. Because the process requires heat curing, the rate of shell-mold- and coremaking is often limited by the rate of heat transfer through the resin-coated sand. To an extent, production rates for shell...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003041
EISBN: 978-1-62708-200-6
... cured to check for compatibility. A standard adhesion test will determine whether a given release agent on the peel ply will transfer to part during cure, which, as noted above, would be detrimental to later bonding or painting. A peel ply can also be used between the mold and a thick laminate to accept...
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
... equipment throughout. The patterns must be of good quality because the slightest flaw or defect in the pattern will be reproduced on the final casting. The reproduction of detail is such that even finger marks on a pattern coating are likely to be transferred to the casting. Most of the common pattern...
Book Chapter

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
... plates Multiple impressions machined from a solid blank of material with the operations and dimensions controlled by direct transfer of computer-aided design and manufacture (CAD-CAM) data In general, increased accuracy will follow through each of the aforementioned stages of pattern equipment...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003035
EISBN: 978-1-62708-200-6
... windup mandrel. When a full roll of SMC is ready, the sheet is cut and transferred to the second windup turret. The full roll is taped to prevent unwinding, and a vapor barrier sleeve is applied. The sleeve film can be any material, such as aluminum foil or monomer-resistant film, that can contain the...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
... die casting machines: hot chamber and cold chamber. In the hot chamber machine ( Fig. 19 ), the injection chamber is a gooseneck inserted in the melt. Pressure is applied to the melt to force some of the metal into the mold. This method avoids one metal transfer operation, and it is used primarily for...
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
... contraction, solid-solid contraction, and liquid-solid contraction. The article discusses the factors influencing the solidification sequence of simple shapes, such as T-sections, X-sections, and L-sections. It also provides an overview of geometric factors that influence heat transfer and transport phenomena...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005260
EISBN: 978-1-62708-187-0
... each casting. Due to more rapid heat transfer and solidification times, castings produced in permanent molds have finer dendrite arm spacing, grain structure, and higher mechanical properties than those cast from a similar alloy in sand. This advantage can translate into thinner walls and significantly...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005420
EISBN: 978-1-62708-196-2
... Abstract This article focuses on the concepts involved in heat-transfer modeling, thermomechanical modeling, and microsegregation modeling of hot tearing. It discusses the modeling of solidification defects, namely, inclusion entrapment, segregation, shrinkage cavities, gas porosity, mold-wall...
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
... characteristics, and the heat-transfer characteristics and thermal stability of the mold. Many foundries, however, are required to pour many different castings from one heat, or even from one ladle. Therefore, these foundries do not attempt to control pouring time, but they do control the speed at which molten...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005296
EISBN: 978-1-62708-187-0
... form of oil, or, more recently, low-melting slag powders, was introduced. Taper of the mold to compensate for metal shrinkage on solidification provided improved heat transfer and, more importantly, fewer cracks. In 1935, a plant with casting rolls for continuous production of brass plates was...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005259
EISBN: 978-1-62708-187-0
... with a water-cooled bottom mold plate. Water cooling requires the machining of radial grooves or slots in the bottom of the bottom mold plate for water passage. Water cooling is sometimes advantageous for extremely heavy wall castings, which can transfer excessive heat into the bottom of the mold...
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
... (such as zircon, olivine, and chromite) have advantages in terms of lower thermal expansion coefficients than silica ( Fig. 3 ). Zircon and chromite also have exceptional heat transfer/chilling properties for heat extraction. Zircon and olivine extract heat faster than silica but not as fast as chromite...