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demolding

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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
..., temperature control, demolding, debinding, and sintering. Finally, the article provides information on powder injection molding mold-filling simulation and two-component powder injection molding, offering a method for high-volume production of microcomponents made of multifunctional materials...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003403
EISBN: 978-1-62708-195-5
... for composite tool design, such as master model or pattern design selection, fiber and fabric selection, resins, and surface coat and ply. Various tool laminate construction techniques, such as curing and demolding, and cutting and trimming, are reviewed. The article describes the substructure design...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003401
EISBN: 978-1-62708-195-5
... stable. If the reinforcement needs to be impregnated as part of the process, a pressure gradient is required to force the matrix through the fiber bed. For thermoset matrices, the time interval from (preimpregnated) molding compound to demoldable part is on the order of a few minutes; however, when the...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003406
EISBN: 978-1-62708-195-5
... occurrence of resin-rich areas. Designs incorporating undercuts are difficult to mold, but not impossible if a multipart (split) mold is used. Draft angles should be a minimum of 2° to allow easy part demolding. Proper placement of reinforcements is very important to preclude sharp changes in thickness...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003479
EISBN: 978-1-62708-195-5
... core, with no loss of stiffness. Polyurethane reduces production times (less than 10 min from mold preparation to demolding) and reduces the number of components. Polyurethane provides excellent adhesive properties and an ideal balance of flexibility and stiffness when combined with laminates. The use...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003020
EISBN: 978-1-62708-200-6
... throughout the mold, followed by a fast cure. The resin must not only gel rapidly to be acceptable for rapid RTM cycles, but must provide sufficient Barcol hardness to allow the component to be demolded without distortion. Some resins will yield lower levels of physical properties if cured rapidly, and the...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005261
EISBN: 978-1-62708-187-0
... maintained on the furnace (feeding time) until the sprue has solidified. Once the sprue has solidified, the furnace pressure is released, and the casting cools until it has hardened enough to withstand the forces applied to it during demolding and ejection from the upper die half. The die then opens, and the...
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: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003402
EISBN: 978-1-62708-195-5
... part had cured sufficiently to retain its shape when it is demolded. A process model can let the engineer or the scientist “see” the filling pattern (as shown in Fig. 2 ) and the curing rate, thus quantifying the knowledge of the filling process. While learning more about the filling from the process...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003409
EISBN: 978-1-62708-195-5
.... These had to be applied in one or several layers between the peel-ply and release-film layers. Prepregs are now reliably produced with a highly controlled resin content of typically 34 ± 1% by weight. Figure 7 ( Ref 2 ) shows a cured, demolded, and trimmed Formula 1 car chassis, upper half. Figure 8...
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
... are frequently designed with undercuts to allow the part to collapse for demolding. Parts cannot have solid ribs or projections because the plastic will not flow into narrow, deep ribs. Reinforcing ribs can be designed as long as they are wide enough for the plastic to flow into them and form a wall...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006498
EISBN: 978-1-62708-207-5
...) process. (a) Tilting and pouring. (b) Swirling. (c) Demolding and transfer. (d) High-pressure die casting (HPDC) press. Courtesy of STAS Inc. With the high-solid-fraction processes, the semisolid slurry flows in a manner similar to a very high-viscosity fluid. Figure 12 shows the sequential...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003414
EISBN: 978-1-62708-195-5
... the reinforcement. The resin cures. The mold is opened and the product is demolded. A general way of distinguishing between different resin injection techniques is how the pressure gradient is applied to force the resin to flow through the mold. In the case of vacuum infusion the pressure...
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
... up), the parts are quickly removed from the mold. With metal, 50 to 60 cycles per hour can readily be made; with plastic, 10 to 15 cycles are typical. Parts with undercuts can be demolded from the rubber mold with no difficulty. Thin-walled parts can be molded comparable to die casting. The rubber...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003407
EISBN: 978-1-62708-195-5
... component and extreme dimensions (up to 50 m, or 165 ft, long), it is desirable to cure the laminate in one operation to avoid prerelease or demolding. This requires a long out-time prepreg, because the lay-up process can take a number of weeks, as well as careful intermediate debulk stages and critical...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003413
EISBN: 978-1-62708-195-5
... part thickness and resin formulation. Urethane-based SRIM resins may be sufficiently rigid for demolding within 40 s of mold fill, while thick sections or epoxy laminates may require several hours in the mold. Process times are generally competitive with SMC for small parts, where 3 min seems a...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001105
EISBN: 978-1-62708-162-7
... then granulating the mixture. The granulated product is heated and injection molded under pressure. The polymer imparts viscous flow characteristics to the mixture to aid in forming, mold filling, and uniform packing. After demolding, the binder is removed, and the remaining cermet structure is...
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
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006513
EISBN: 978-1-62708-207-5
... furnace pressure is released, and the casting cools until it has hardened enough to withstand the forces applied to it during demolding and ejection from the upper die half. The die opens, and the casting is ejected during the mold-open phase of the casting cycle. Fig. 14 Counterpressure casting...