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Gating and risering

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Image
Published: 01 December 1998
Fig. 1 Patterns for a sand casting and its gating and risering systems, for four different methods of mold production More
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003472
EISBN: 978-1-62708-195-5
.... Foundry scrap, gates, risers, and clean, uncoated parts can be grit or shot blasted, blown clean, and melted with new ingot. Since the production of castings often creates some oxides in the finished product, excessive amounts of recycled materials may contribute to excessive oxides in the melt, reducing...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003171
EISBN: 978-1-62708-199-3
... shrinkage. This article describes the imperfections in the solidification process including porosity, inclusions, oxide films, secondary phases, hot tears, and metal penetration. It talks about the purpose of the gating system and the risering system in the casting process. alloys casting gating...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009014
EISBN: 978-1-62708-187-0
... to ambient temperature (hr) t trim = time to remove gates, risers, etc. (hr) Since many castings involve more than one core, the per unit cost of coring ( C C ) is calculated as, (Eq 3) C c = ∑ i = 1 n c ( V ′ C m ′ + C 0 ′ t c y c l e...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009023
EISBN: 978-1-62708-187-0
... the rejection rate to less than five percent. Machining costs increased due to the extra metal to be removed, but this cost increase was less than the costs with a 50 percent rejection rate. The heavy padding was adopted for production. This casting and its gating and risering system demonstrate several...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005355
EISBN: 978-1-62708-187-0
...), metal-to-sand ratio, and gating/risering affect the amount of energy required to remove the sand core from the casting. The most common method used to clean core sand from aluminum castings is mechanical vibration with pneumatic tools. In most instances, the core sand has less inherent strength than...
Image
Published: 01 January 1990
Fig. 12 Effect of gating system on formation of shrinkage cavities. Solidification starts at the chill and progresses toward the riser. In (a), molten metal can easily feed from the riser into the entire length of the casting. In (b), the narrow portion of the casting can freeze shut before More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005303
EISBN: 978-1-62708-187-0
..., including melting practices (e.g., selection of melting furnace and molten-metal treatments), pouring practices, and gating and risering techniques Proper selection of the casting process, which, in turn, depends on the size, shape, and technical requirements of the product This article addresses...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005287
EISBN: 978-1-62708-187-0
..., shell mold casting, plaster casting, investment casting, permanent mold casting, squeeze casting, semisolid forming, centrifugal casting, and pressure die casting. The article presents several different factors on which the selection of a casting process depends. It discusses gating and risering...
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
... processes such as die casting and permanent mold casting. The article reviews the pattern features and mold production considerations used in the pattern design, namely, parting line considerations, addition of gates and risers, core prints, and locating points. It examines the pattern allowances...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005351
EISBN: 978-1-62708-187-0
... Abstract In the handling of molten aluminum, it is fairly common to use filters as a part of the melting unit and in the gating and/or riser system. This article describes the methods of in-furnace and in-mold filtration, with an emphasis on the filtration of molten aluminum. It discusses...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006329
EISBN: 978-1-62708-179-5
... Abstract Foundry practices critical to the production of cast irons include melting, alloying, molten metal treatment, pouring, and the design of feeding systems (gating and risering) to allow proper filling of the casting mold. This article reviews these production stages of iron foundry...
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
... is opened, and the casting removed. Steps 2 to 4 are repeated until repair of the refractory coating is required, at which time step 1 is repeated to the extent necessary. The usual foundry practice is followed for trimming gates and risers from the castings. Permanent Mold Casting A basic...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009022
EISBN: 978-1-62708-187-0
.... For some castings where chilling of metal by the mold is possible, there is no assurance that freezing will start at points farthest from the gate and progress in an orderly manner to the gate so that the volume of metal lost because of shrinkage can be replaced from the reservoir (riser) intended...
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
... techniques for gating, risering, melting, sand conditioning, or any of the other factors involved in making good castings. Compared to other cast metals ( Table 1 ), the steel castability may be described as “fair” relative to cast irons and aluminum (aluminum-silicon) alloys. The feasibility of a given...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009016
EISBN: 978-1-62708-187-0
... of metallurgical and mold conditions, expansion phenomena can be used to reduce greatly or eliminate risers; with the liquid shrinkage accommodated by the gating system instead of the riser system ( Ref 5 ). Solidification contraction for various cast metals Table 1 Solidification contraction for various...
Image
Published: 01 December 2008
Fig. 11 Thin center section, formed by two cores, was not readily accessible to gating and risering. More
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
... stage is to design the rigging system for the casting, which includes the design of the gate, risers, downsprue, and so forth. This has been based on the rules of thumb of foundry experts and empirical charts. Once the rigging design is established, the solidification behavior can be evaluated. Here...
Book Chapter

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
... metal to enter the mold cavity will generally be the hottest, it is usually desirable to introduce metal in those parts of the casting that would already be expected to be the last to solidify. One obvious method of accomplishing this is to direct the metal flow from the gating system into a riser, from...
Image
Published: 01 December 2008
Fig. 20 Thin center section, formed by two cores, was not readily accessible to gating and risering. See text for discussion. More