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core blows

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Image
Published: 01 December 2008
Fig. 7 (a) Core blow—a trapped bubble containing core gases. (b) Bubble trail, ending in an exfoliated dross defect as the result of the passage of copious volumes of core gas prior to freezing. More
Image
Published: 01 December 2008
Fig. 5 Typical core-blowing setup More
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
... Abstract This article provides a discussion on ten rules for the effective production of reliable castings. These rules include good-quality melt, liquid front damage, liquid front stop, bubble damage, core blows, shrinkage damage, convection damage, segregation, residual stress, and location...
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
... manifold and a lower gas exhaust manifold. The catalyst gas enters the core box through the blow ports or vents and passes through the core, causing almost instantaneous hardening of the resin-coated sand. The core is ready for ejection from the core box after purging with clean air for a few seconds...
Image
Published: 01 December 1998
through the blow ports or vents and passes through the core, causing almost instantaneous hardening of the resin-coated sand. The core is ready for ejection from the core box after purging with clean air for a few seconds. After the catalyst gas passes through the core, it leaves the core box through More
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
.... Mixtures usually are blown into a core box, which gives excellent dimensional accuracy to the cores. The core-blowing procedure is described in more detail in the subsection “ Core Blowing ” in the section “ Nonpermanent Mold Processes ” in this article. Because gas curing takes place inside the core...
Image
Published: 01 December 2008
the core box through the blow ports or vents and passes through the core, causing almost instantaneous hardening of the resin-coated sand. The core is ready for ejection from the core box after purging with clean air for a few seconds. After the catalyst gas passes through the core, it leaves the core box More
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
... borohydride 140 1200 2700 Carbon dioxide Sodium bicarbonate 110 550 120 (a) In cm 3 /100 in. 2 /24 h, atmospheric Blisters result from the blowing agent gas, which is under greater than atmospheric pressure in the core of the part, and migrates through the plastic material to reach...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006935
EISBN: 978-1-62708-395-9
..., is advantageous in such processes as blow molding or vacuum forming. The toughness of a polymer can be increased by adding rubbery particles as a second noncontinuous phase. Such particles disrupt crack propagation. Butadiene has this effect in toughened polystyrene and ABS. Some thermoplastics have...
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
... that will be part of the final mold assembly. Because a given casting may have a complex internal shape or many internal passageways, the cost of producing core boxes may exceed that of the associated mold pattern. An example of an intricate full split aluminum core box used in a core blowing machine is shown...
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
... for preparation of resin-sand mixture for shell molding, namely, mixing resin and sand according to conventional dry mixing techniques, and coating the sand with resin. Shaping of shell molds and cores from resin sand mixtures is accomplished in machines. The article discusses the major steps in producing a mold...
Series: ASM Handbook Archive
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000613
EISBN: 978-1-62708-181-8
... near the upper right corner; it is to this area that the markings of radial fibrous fracture in the core of the die may be traced. The region of fast fracture encompasses nearly the entire fracture surface. Note the fine-grained, sharply defined case that frames the fibrous core. Actual size. Fig...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... guidelines, and special processes. It also covers the functions of the extruder, webline handling, mixing and compounding operations, and process troubleshooting. Thermoforming and mold design are covered. Various other technologies for polymer processing covered in this article are blow molding, rotational...
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
... fill cope and drag molding chambers simultaneously by blowing the sand into the cavity ( Fig. 11 ). After the blowing operation, the mold is compacted by a squeezing operation. After squeezing, the mold halves are withdrawn from the pattern and are available for any necessary finishing or core setting...
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
... hardening takes place, which causes trouble in the subsequent blowing or ramming operations. If it is necessary for the mulled mixture to be held for any length of time prior to making the cores or molds, covering the mixture with a damp cloth will help to retard the natural hardening. Molding...
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
... systems. Inorganic binders are also suitable for Cerabeads. Core making is more common in typical aluminum casting situations. A coarse aggregate with grain size of 40 to 65 is preferred, because this makes a low demand on binders, with excellent permeability and reduced blow-out defects. Cerabeads can...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002491
EISBN: 978-1-62708-194-8
... Abstract This article describes key processing methods and related design, manufacturing, and application considerations for plastic parts. The methods include injection molding, extrusion, thermoforming, blow molding, rotational molding, compression molding/transfer molding, composites...
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
... large items are quite low, compared with most other plastics processes. However, production rates per individual machine may be lower than with other processes, such as injection molding and blow molding. Because rotational molding can produce uniform wall thickness on hollow parts up to 83,300 L...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003566
EISBN: 978-1-62708-180-1
... handles were held in a rubber-lined clamp attached at one end of a rotating shaft. A torque spring was connected through a lever arm at the opposite end of the shaft. To wind up the spring and place the hammer in position to begin the blow, a ratiomotor drive rotated the shaft. A trigger mechanism...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
..., and material selection. Recessed features, where the materials can shrink onto the cores, require greater draft than features in which the materials shrink away from the cavity walls. One example in which draft is critical are the open handles found as part of a blow-molded bottle, like a gallon milk container...