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thermal expansion molding

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Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003405
EISBN: 978-1-62708-195-5
... two basic methods, such as the trapped or fixed volume rubber method and the variable-volume rubber method, of elastomeric tooling, which use the principles of thermal expansion molding. The significant properties and controlling equations that are required to characterize elastomeric tooling material...
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
.... It discusses a variety of sand reclamation systems, including wet washing/scrubbing and thermal-calcining/thermal-dry scrubbing combinations. chemically bonded sand molding green sand molding molding equipment flask molds flaskless molds springback expansion defects sand reclamation...
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
... shown in Fig. 4 . Fig. 4 Allotropic transitions of quartz From the metal/mold interface, the layers of the mold heat up to a range of temperatures, due to the relatively low thermal conductivity of silica sand. Therefore, the rate of expansion is different based on the distance from the...
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
... binders, namely, furan no-bake resins, phenolic no-bake resins, and urethanes. The article provides an overview of gas-cured organic binders. It also illustrates the three commercial systems for sand reclamation: wet reclamation systems, dry reclamation systems, and thermal reclamation. inorganic...
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
... durability is paramount. Also, graphite-epoxy tooling is used for highly contoured parts and when a low mismatch in the coefficient of thermal expansion between the mold and part is vital. All three of these tooling techniques are discussed in the section “Tooling” in this article. In selecting...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006055
EISBN: 978-1-62708-175-7
.... Tool wear in mold cavities is typically minimal for most MIM processes, especially for feedstocks with low-hardness (<HRC 25) powders. The relatively low injection temperatures of most MIM feedstocks and the insulating characteristics of the polymers in MIM feedstocks help minimize thermal shock...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
... molds Permanent molds can be machined from solid blocks of graphite instead of steel. The low coefficient of thermal expansion and superior resistance to distortion of graphite make it attractive for the reproducible production of successive castings made in the same mold. Because graphite...
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
... alloys will react with any free water that remains in the mold and will cause an explosion. Zinc alloys are frequently cast in plaster molds, most often for prototype castings. The die-casting alloys AG40A and AC41A are often used, but a proprietary alloy whose coefficient of thermal expansion is very...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005503
EISBN: 978-1-62708-197-9
... useful for powder injection molding, because inertia, thermal conductivity, and powder-binder separation are new concerns with PIM feedstock. The feedstock enters the barrel as cold granules, and during compression to remove trapped air, it is heated above the binder melting temperature. Because the...
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
... aggregates. These may be chosen in circumstances that require different heat-transfer or thermal expansion rates. In shell-mold casting, the greater strength available in the resin bond allows the use of a finer grain size for a given casting weight than is possible in sand casting. Except for aluminum...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003016
EISBN: 978-1-62708-200-6
... still achieve good surface reproduction with proper venting and texture depth. Fig. 5 Draft angle that facilities demolding part. Required draft angle increases with decreasing linear coefficient of thermal expansion of material, and with depth of texture on mold. Pinch-off areas are used to...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006021
EISBN: 978-1-62708-175-7
... densification steps are necessary. The most important parameters are powder loading (which affects sintering shrinkage), sintering temperature, and the thermal expansion of the materials. It is possible to produce both fixed and moving connections. For a core-shell design, both components have nearly...
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
... lower material costs. Air-pump compressor vanes are a potential application for long-fiber-reinforced thermoset molding compounds. The molded part would replace a punched-glass laminate, which sometimes fails by delaminating. High strength, low thermal expansion, and temperature resistance up to 205...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006141
EISBN: 978-1-62708-175-7
... of thermal debinding during which the molded part is subjected to temperatures at which all of the remaining organic binder phase is slowly removed from the part usually in the form of gaseous species. At this time, the debound part is quite fragile and porous. With increased exposure of the parts to...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003019
EISBN: 978-1-62708-200-6
... 60 wt% glass-fiber reinforcement. Normally, SMC for nonstructural automotive trim and body applications is 27 to 30 wt% glass fiber. Fillers are often used to minimize resin cost and lower thermal expansion of the product. Resin chemistry has a major influence on the strength and reliability of the...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003035
EISBN: 978-1-62708-200-6
... hardness number H50-H112 Specific gravity 1.7–2.1 Density, g/cm 3 1.7–2.1 Coefficient of thermal expansion, 10 −6 /K 15–22 It should be noted that most standardized laboratory tests are, at best, a simplification or approximation of what may happen to a finished part in use. The shape...
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
... gas addition. On the other hand, the use of chemical blowing agents has increased. These agents generate the gas necessary for structural foam by either thermal decomposition or a chemical reaction in the melt. Factors to consider when selecting a blowing agent for a particular thermoplastic are...
Book Chapter

Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003370
EISBN: 978-1-62708-195-5
... distortion temperature, °C (°F) 150–205 (300–400) Thermal conductivity, W/m · K (Btu · in./h · ft 2 ·°F) 0.19–0.25 (1.3–1.7) UL flammability class, V 945 Rockwell hardness number H50–H112 Specific gravity 1.7–2.1 Density, g/cm 3 1.7–2.1 Coefficient of thermal expansion, 10 –6 /K 15...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003415
EISBN: 978-1-62708-195-5
... Abstract Compression molding is the single largest primary manufacturing process used for automotive composite applications. This article provides a general overview of the compression molding process. It describes the basic design, materials, and processing equipment of three main groups of...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003023
EISBN: 978-1-62708-200-6
... Coefficient of linear thermal expansion, 10 −5 /K Mold shrinkage, μm/m Polyethylene  Low density 10–20 20–40  High density 10–20 20–40 Polypropylene 2–20 10–30 Nylon 6/6 10 20 Polystyrene 6–8 2–6 Polycarbonate 7 −7 Polybutylene terephthalate  Unfilled 6–10 9–20...