Friday, August 14, 2009

Casting LM6 products

Silicon content
8 - 10 % for Sand Casting
10 - 12% for Gravity Gasting
5 - 15% for Pressure die casting




Casting Fundamentals

  1. Fundamentals of Casting

    Fundamentals of Casting. In casting, a solid is melted, heated to proper temperature, and sometimes treated to modify its chemical composition. ...
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  2. Fundamentals of Metal Casting,Metal Mould Casting,Mould Casting ...

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  3. [PDF]

    Microsoft PowerPoint - casting_website

    File Format: PDF/Adobe Acrobat - View as HTML
    Fundamentals of Casting. Casting: It is a process in which molten metal ... Fundamentalsof Casting. Core: A core is the mass of dry sand to obtain the ...
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  4. The fundamentals of fly casting, by Lefty Kreh

    Fundamental casting skills and techniques tailored for begining casters.
    www.flyfisherman.com/skills/lkcastingbasic/index.html - Cached - Similar -
  5. Fundamentals of Die Casting Design » Free download engineering ...

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  6. Fundamentals of Casting Ppt Presentation

    3 Nov 2008 ... A presentation on Fundamentals of Casting in Others/ Misc on authorSTREAM.
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  7. Die Casting Free Content Textbook

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  8. Fundamentals of Manufacturing - Google Books Result

    by Philip D. Rufe - 2001 - Technology & Engineering - 420 pages
    Commercial capability of casting processes Fundamentals of Manufacturing ... Chapter 25Casting 25.1 CASTING FUNDAMENTALS Casting is a process in which ...
    books.google.com/books?isbn=0872635244... -
  9. Fundamentals of Die Casting Design

    15 Oct 2008 ... Fundamentals of Die Casting Design. ... channels introduction typical diagram hydraulic jump 2. die casting design vi runner design backward ...
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  10. [PDF]

    Fundamentals of Casting

    File Format: PDF/Adobe Acrobat - View as HTML
    Engineering Dept. 1. Fundamentals of Casting. Casting, one of the oldest manufacturing processes, dates back to 4000 B.C. when copper arrowheads were made. ...
    www.engr.sjsu.edu/minicurric/images/lecture.../casting.pdf - Similar -

    Sunday, July 19, 2009

    Important LINKS

    CONTACT US

    Sand Casting
    Gravity Casting
    Pressure die casting

    Saturday, July 18, 2009

    Sand Casting fundamentals


    Introduction

    Sand casting is used to make large parts (typically Iron, but also Bronze, Brass, Aluminum). Molten metal is poured into a mold cavity formed out of sand (natural or synthetic). The processes of sand casting are discussed in this section, includepatterns, sprues and runners, design considerations, and casting allowance.

    Patterns

    The cavity in the sand is formed by using a pattern (an approximate duplicate of the real part), which are typically made out of wood, sometimes metal. The cavity is contained in an aggregate housed in a box called the flask. Core is a sand shape inserted into the mold to produce the internal features of the part such as holes or internal passages. Cores are placed in the cavity to form holes of the desired shapes. Core print is the region added to the pattern, core, or mold that is used to locate and support the core within the mold. A riser is an extra void created in the mold to contain excessive molten material. The purpose of this is feed the molten metal to the mold cavity as the molten metal solidifies and shrinks, and thereby prevents voids in the main casting.


    Typical Components of a Two-part Sand Casting Mold.

    Mnfr plaster based mold materials and consumables for metal casting.
    www.srs-ltd.co.uk
    Cavities, Cores, Ejectors, Sleeves Blades, Gate Inserts, & Tooling
    www.ezellprecision.com
    Furnaces for investment casting Burn out, Pre heat, Dewax,
    www.armilcfs.com
    In a two-part mold, which is typical of sand castings, the upper half, including the top half of the pattern, flask, and core is called cope and the lower half is called drag. The parting line or the parting surface is line or surface that separates the cope and drag. The drag is first filled partially with sand, and the core print, the cores, and the gating system are placed near the parting line. The cope is then assembled to the drag, and the sand is poured on the cope half, covering the pattern, core and the gating system. The sand is compacted by vibration and mechanical means. Next, the cope is removed from the drag, and the pattern is carefully removed. The object is to remove the pattern without breaking the mold cavity. This is facilitated by designing a draft, a slight angular offset from the vertical to the vertical surfaces of the pattern. This is usually a minimum of 1° or 1.5 mm (0.060 in), whichever is greater. The rougher the surface of the pattern, the more the draft to be provided.

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    Sprues and Runners

    The molten material is poured in the pouring cup, which is part of the gating system that supplies the molten material to the mold cavity. The vertical part of the gating system connected to the pouring cup is the sprue, and the horizontal portion is called the runners and finally to the multiple points where it is introduced to the mold cavity called the gates. Additionally there are extensions to the gating system called vents that provide the path for the built up gases and the displaced air to vent to the atmosphere.

    The cavity is usually made oversize to allow for the metal contraction as it cools down to room temperature. This is achieved by making the pattern oversize. To account for shrinking, the pattern must be made oversize by these factors, on the average. These are linear factors and apply in each direction. These shrinkage allowance are only approximate, because the exact allowance is determined the shape and size of the casting. In addition, different parts of the casting might require a different shrinkage allowance. See the casting allowance table for the approximate shrinkage allowance expressed as the Pattern Oversize Factor.

    Sand castings generally have a rough surface sometimes with surface impurities, and surface variations. A machining (finish) allowance is made for this type of defect. Seecasting allowance table for the finish allowance.

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    SOURCE