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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009017
EISBN: 978-1-62708-187-0
... Abstract A gating system is the conduit network through which liquid metal enters a mold and flows to fill the mold cavity, where the metal can then solidify to form the desired casting shape. This article discusses various desirable design considerations for the gating system. Proper design...
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Published: 01 November 2010
Fig. 41 Ring gate design at a critical time in the cooling process. (a) Temperature. (b) Solidification. (c) Porosity More
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Published: 01 December 2008
Fig. 8 Effect of pressure head and change in gate design on the velocity of metal flow. A, 90° bend; B, r / d = 1; C, r / d = 6; D, multiple 90° bends. The variables r and d are the radius of curvature and the diameter of the runner, respectively. Source: Ref 2 More
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Published: 09 June 2014
Fig. 4 (a) Immersion probe for the immersion test. (b) Typical ultrasonic response from a hardened steel axle shaft. Two gates, designated by horizontal lines, measure the distance between the two points at which the echoes cross a preset value. More
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Published: 30 November 2018
Fig. 33 Good casting design permitting ideal location of gates enabled efficient production of this aluminum permanent-mold casting. Although casting wall thickness is only 2.36 mm (0.093 in.), all surfaces were produced to a finish of at least 125 micro-in. More
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Published: 01 December 2008
Fig. 11 Properly designed bottom gate that ensures smooth filling of the casting while producing minimal turbulence More
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Published: 01 December 2008
Fig. 13 Gating system designs for optimizing the effectiveness of ceramic filters in horizontally parted molds having sprue:filter:runner:ingate cross-sectional area ratios of (a) 1:3–6:1.1:1.2 and (b) 1.2:3–6:1.0:1.1 More
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Published: 01 December 2008
Fig. 11 The diecasting designers opted for a center-shot gate for molten metal flow. This allowed metal to flow uniformly and rapidly into all the thin-wall ribs and outer rim. More
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Published: 01 December 2008
Fig. 25 Good casting design, permitting ideal location of gates, made for efficient production of this aluminum permanent mold casting. Although this casting had a wall thickness of 0.093 in., the recommended minimum for the material and process ( Table 1 ), all surfaces were produced More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005266
EISBN: 978-1-62708-187-0
... the design of the part and the die casting process, especially the gating and parting-line definition. Trimming is facilitated by flat parting lines. The relatively rough edge that results from trimming may be acceptable and is often left as is. In some cases, this rough edge is not acceptable and must...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003171
EISBN: 978-1-62708-199-3
... component. Porosity and casting costs are minimized in casting designs that emphasize progressive solidification toward a gate or riser, tapered walls, and the avoidance of hot spots. Inclusions Inclusions are nonmetallic particles found in the casting. They may form during solidification...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005318
EISBN: 978-1-62708-187-0
... temperature reduces the strength of the cast metal, which may be an advantage for trimming certain casting geometry. Trimming conditions directly influence the design of the part and the die casting process, especially gating and parting line definition. Trimming is facilitated by flat parting lines...
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
... of both must be judicious. Mold Wall Thickness In designing a permanent mold, the part is laid out in the desired orientation, and the mold is designed around it, allowing sufficient space for gating and sealing to prevent metal leakage and for coring and inserts. It is common practice to contour...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005336
EISBN: 978-1-62708-187-0
... time in seconds is designed to be the square root of poured weight in pounds. Thus, the average pouring rate in lb/s also is numerically equal to the pouring time. The pouring rate is determined by the sprue head height, the smallest cross-sectional area in the gating system, which is also termed...
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
..., a subset of the process consideration, is one that is not used too often, but for certain processes and part geometries it is crucial. For example, in injection molding, for a large part that might have long asymmetrical flow lengths, the design engineer will want to consider all possible gate locations...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005233
EISBN: 978-1-62708-187-0
..., and less obvious, is the effect of convective fluid flow during solidification of the casting. It is the task of the foundry engineer to design gating and riser systems ( Fig. 3 ) that ensure proper filling and solidification. The CFD is an ideal tool for tracking the location of the three- dimensional...
Image
Published: 01 December 2008
Fig. 23 (a) In the original design of this investment cast turbine blade, careful removal of the gates located on the contoured surface was required, to maintain the airfoil shape. (b) Simplified gating and gate removal were made possible by eliminating one notch and gating into a flat surface More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006912
EISBN: 978-1-62708-395-9
... where a radius cannot be included Minimize Material Flow and Optimize Gate Location Product designers are often focused on the overall function, shape, and assembly of the product. Plastic part design requires that designers consider the mold design and processing parameters associated...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005221
EISBN: 978-1-62708-187-0
... ). The filling-system design widely employed in the cast iron industry is the pressurized system. Here, the so-called gating ratio is often approximately 1 to 0.9 to 0.9, allowing the channels to run full, provided air is not introduced in the basin. However, poor conical basin designs and improperly tapered...
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
... pouring time, but they do control the speed at which molten steel enters the mold cavity. This control is achieved ugh the design of the gating system. Pouring analysis is based on Bernoulli's theorem of fluid flow. Ladles The types of ladles used for pouring steel castings include bottom-pour...