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risering system

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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 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.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...
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 feeding systems used in riser design: riser sleeves, topping compounds, and breaker cores. metal contamination riser design feed metal volume riser location liquid feed metal duration riser sleeves topping compounds breaker cores riser size riser necks RISER DESIGN, or risering, deals...
Image
Published: 01 December 2008
Fig. 20 Example of a design system for tapered tall risers. Source: Ref 24 More
Image
Published: 01 December 2008
Fig. 16 A system for calculating riser dimensions. M s , volume/effective cooling surface of largest section of castings; M n , circumference of riser neck/cross section area of riser neck. Modulus of riser = 1.2 M n . Source: Ref 24 More
Image
Published: 31 August 2017
Fig. 8 A system for calculating riser neck connections. M s , volume/effective cooling surface of the largest section of the casting. M n , circumference of riser neck/cross section area of riser neck. Modulus of riser = 1.2 M n . Source: Ref 7 More
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
... required a core to form the ingate area and prevent mold wash. Producing this core and setting it in the mold entailed additional cost. The lower yield of the two-riser system, plus the cost of the core, made it distinctly advantageous to add the padding and feed the central hub from the riser that fed...
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
... pouring offers advantages in less pouring turbulence, more consistent filling speeds, less reliance on operator skills, and it facilitates full automation. Also, gating systems can be minimized in many applications; that is pouring gates can also serve as feed risers, and many castings can be poured...
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
Image
Published: 01 December 2008
Fig. 22 Schematic showing the application of feeding systems for (a) a closed-top riser and (b) an open-top riser 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
... factors that influence the selection of a casting method. It discusses the production of copper alloy castings. The article concludes with information on the gating and feeding systems used in production of copper alloy castings. casting copper alloys crucible furnaces degassing deoxidation gas...
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
... fluidity and part integrity. Good casting techniques direct oxides into the gate and riser system. Therefore, a more conservative approach would be to process gating separately with the fluxing procedure outlined below. Extra cleaning is required as the level of SiC in the alloy increases, since even low...
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
... in the finished casting before gating and risers are placed. This will help to refine the casting design and identify potential hot spots for riser placement. Gating The primary function of a gating system is to introduce clean, dross-free metal from the pouring ladle to the mold cavity and to do so...
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: 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
... ability to visualize complex three-dimensional geometry and to analyze stress levels and deflections of complex three-dimensional shapes. Rigging System Design The rigging system includes the system of sprues, runners, gates, risers, and chills that channel and control the flow of liquid metal...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003176
EISBN: 978-1-62708-199-3
... that will occur during casting and heat treatment and can be used to minimize residual stresses. Some commercial packages include expert systems to help orient the casting in the mold to minimize casting defects and to suggest gating and risering schemes. Finite element and finite difference models represent...
Image
Published: 01 December 2008
Fig. 23 Heat loss from a riser as a function of time for the major classifications of feeding systems, with sand included as the basis for comparison More
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
... this principle, the gear blank casting shown in Fig. 7 is provided with a large riser over the central hub and six smaller risers spaced equally around the rim of the gear to ensure adequate feeding. Metal enters the mold at the two gates, which are 180° apart. Fig. 7 Gating and feeding system used...