What is Casting: Definition and 29 Discussions

Casting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Casting materials are usually metals or various time setting materials that cure after mixing two or more components together; examples are epoxy, concrete, plaster and clay. Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods. Heavy equipment like machine tool beds, ships' propellers, etc. can be cast easily in the required size, rather than fabricating by joining several small pieces.Casting is a 7,000-year-old process. The oldest surviving casting is a copper frog from 3200 BC.

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  1. C

    Possible casting issue in declaration of function in header file

    Hello all, see below for a snippet of a header file, class1.h, and source code file, class1.cpp, adjusted to reproduce the issue I am having. I have declared a series of functions in the .h file and their corresponding definitions in the .cpp file but when I compile I get the error...
  2. M

    Chemical Composition of nickel alloy

    I ask the foundry to cast nickel alloys and I took a piece metal to do a chemical test. The element composition of the nickel alloy is Ni 70% Cr 12% Fe 1.2% Mo 2.5%...so far they all are in the allowable range. But I found the alloy also contains W 0.004% ! Is this the normal condition ? ? I...
  3. S

    Is it safe to touch a gel casting tray with bare hands

    Hi everyone, I just touched empty gel casting tray with bare hands which was used for Gel Electrophoresis in which Ethidium bromide was used. I came to know that ethidium bromide is a mutagen and carcinogenic and teratogenic. I am panicked and worried. Is it safe? Kindly answer me. Regards, Swetha
  4. A

    ZnO solution/Drop casting deposition

    I want to a make a solution from ZnO powder to deposit a layer on glass substrate by drop casting method. How can i make this solutin?
  5. C

    Wood/Glass/Metal Can I use sodium silicate waterglass to cast a glass object?

    Waterglass is sodium silicate dissolved in water that upon drying forms soda glass. Could it therefore be used to cast a glass object like a slab or will it not form nicely?
  6. D

    Casting of ground beam and ground slab

    Homework Statement Guys, I was told that the ground beam can't cat together with ground slab ? Why ? Why for first floor , the beam can be casted together with ground slab ? Homework EquationsThe Attempt at a Solution I think the ground beam can be casted together with ground slab ... Am i...
  7. P

    B What are the physics behind fishing rods?

    Hi everyone, First post here. Been out of school for a while and quite rusty, but always had an interest in physics, and was pretty good back in the day. Can anyone help me understand the physics of fishing rods? How to look at a fishing rod in terms of physics and mechanics? (i.e. is it a...
  8. G

    Investment casting of complex shapes

    Hi guys, I am learning about investment casting at the moment and have a question I would love someone to answer. In investment casting a wax pattern needs to be created. How would that be made for a complex shape like an impeller? I've heard that lots of impellers are created using...
  9. Mr Davis 97

    Why is type casting different in Java and Python?

    I am writing code in both Java and Python, and am a little confused about one thing: casting. In Python, we cast data types by using int(), str(), float(), etc. These are functions which convert one data type to its representation as another data type. However, in Java, it doesn't work like...
  10. I

    Initial and final velocity from a sheared casting

    Good evening all, I am looking for a little guidance with relation to trying to find the initial and impact velocity of a section of a steel casting if it shears. Given the results of stress analysis, the mass of the sheared section would be 200kg maximum. The input force at that would be...
  11. A

    Shock absorption properties better from casting or forging?

    Hi I want to ask which of the cast steels or forged steels provide with better shock absorption? The component has to be used in the under chassis of heavy trucks in bumpy roads. Can anyone help me with that? Thank You
  12. O

    Volume of a Cavity in an Iron Casting

    Homework Statement An iron casting weighs 300 N in air and 200 N in water. What is the volume of cavities in the casting, if the density of iron is 7800 kg/m3 ? Homework Equations d = m/V Fg = mg The Attempt at a Solution I was not sure in the slightest of how to solve this problem. So I...
  13. jmex

    Casting grades for different materials

    Hello, I am confused with casting grades of different steel,for example 316 SS has casting grade CF8M. What does it mean and where can i find grades of other materials as well like 316L, 304L. 304, CS, etc. Any data sheet showing grades for every material will be helpful. Thanks
  14. P

    Is Die Casting a Cost-Effective Method for Small Metal Components?

    I know that the initial outlay for automated equipment is quite high etc but the running cost is relatively low isn't it? Is it right to say thatf for smaller metal components die casting is favoured as not much further work is required to the work piece
  15. R

    Finding the Height of an Object Casting a Shadow that is Moving at a Given Speed

    I'm trying to solve a seemingly basic question but it seems to be taking me towards some advanced dynamics that is over my head. Any help would be appreciated. (If it matters, this is not a homework problem - I am simply curious about the answer and how to solve it.) Homework Statement...
  16. I

    Casting 2x2 matrix with unit determinant in another form

    Dear all, I have a simple question for you. Any help will be very appreciated. ==Assumptions=== I have a 2x2 matrix, with real entries: |A B| |C D| Such matrix has unit determinant, AD-BC=1. (For those of you in group theory: the above is a representative of SL(2,R))...
  17. T

    Motor required for spin casting, 10-100rpm

    I'm attempting to spin cast a parabola, and aim to hang my spinning vessel directly from the driveshaft of a motor to get it to spin as cleanly as possible. Are there any PWM (12v ideally) 10-100rpm dc motors than could support 10kg thrust load? I would strongly prefer to not use gear systems...
  18. T

    Comp Sci Casting in java && wrapper class

    casting in java...&& wrapper class Homework Statement well my question is quite simple. 1..) when a vector is instantiated ,does it needs to have a particular data type like integer,employee... like in case of array or does any object can be put into it irrespective of its name... example...
  19. J

    Latest results from the LHC are casting doubt on the theory of supersymmetry

    Latest results from the LHC are casting doubt on the theory of supersymmetry http://www.scientificamerican.com/article.cfm?id=beautiful-theory-collides "I'm wouldn't say I'm concerned," says John Ellis, a theorist at CERN, Europe's particle-physics lab near Geneva, who has worked on...
  20. V

    Where Can I Find a Community of Intelligent and Diverse Individuals Like Myself?

    At first I thought it would be ridiculous to ask this question in a forum but, in reality it's probably the best place ironically. (background information) I am a recent college graduate. Metal Casting technician. 26 years old, and basically decided to self-cure my Social phobia. No offense to...
  21. 3

    Casting a metal (Enthelpy of Fusion Question)

    I want to take a liquid metal, Aluminum at 700oC and pour it into a steel mold starting at 20oC. For the purpose of the question let’s say that the heat transfer is 100% with no losses to the surroundings. Here are some numbers: Al Mass = 200 g = 0.2 Kg Ti, Al = 700oC Cp = 900 J/Kg-K...
  22. R

    Alternative Methods to Die Casting :

    Anyone knows of any alternative methods ot fabricate a Copper-Berrilium / or Copper-Nickel / alloy into a small tubular form (Custom design)... I need to Mold a Copper Alloy with the following dimensions : Precision required...
  23. C

    Aluminium Casting: Bonding & Issues | 65 Characters

    Hi all, I am after some materials based help please. Im trying to re-profile part of an intake runner on an aluminium cylinder head. Wanting longevity, I've opted against the usual route of using epoxy resin to build up a specific area. Basically i would like to try and fill the section (or...
  24. B

    Embossing graphics into a casting - any idea of max resolution?

    We're producing high quality steel castings which are then hot dip galvanized, so the surface has a layer of zinc in addition to the steel. We need to cast some basic branding and size details into the product, with a slightly raised embossing, and I can't get any sensible info from anyone...
  25. T

    What is the best material for thermo molding fins on a helix wind turbine?

    Im building an outside vertical axis wind turbine. i need to build the (about 20) plastic fins that are going to be used to form the helix (which is the wind turbine) im trying to build the fins that are used on the helix wind turbine. a good video of it is on youtube: a crappy picture of...
  26. A

    Casting a Large, Sharp Shadow Through Lace

    I am an artist. I am trying to cast a large sharp (in focus) shadow through a piece of lace onto a wall. It either turns out large and blurry if it is far from the wall, or sharp and small if it is closer to the wall. I have tried the following experiments: 1. Increased the focus and...
  27. O

    Understanding the Casting Process for High Strength Steel for Beginners

    Hi, I was wondering how to tell if a part is an ingot or continuously cast. I'm looking at a high strength steel. It's a part of a bulldozer and has some bolt holes. I was wondering if people could offer some guidance as to how I should proceed to figure out the processing steps taken to...
  28. S

    The Mystery of Sand Casting: Steps for Solid & Hollow Objects

    Wow, this forum seems to be full of engineering brilliance :P. Anyway can anyone help me with this. The stages in sand casting to produce: a) solid object that is thinner at the centre than at the ends b) hollow object with two openings of diameters less than the component diameter...
  29. wolram

    Alternatives to Metal Casting: Try Metal Repair Compound

    If this stuff is so good why not use it instead of casting ? http://www.alibaba.com/catalog/10408794/Metal_Repair_Compound.html For small batch work, it seems ideal, i have seen other products that claim to be equal to this, ie one that repairs stainless steel, even shafts, there must...
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