Mould casting, Electrical Engineering

Mould Casting:

Plaster Moulding : In this method, the mould is prepared in gypsum or plaster of paris. In practice, the plaster of paris is mixed with tale, asbestos, fibers, silica flour and a controlled amount of water to form a slurry. This plaster slurry is poured over the metallic pattern confined in a flask. The mould is vibrated and the slurry allowed to set. The pattern is removed after about 30 minutes, when the setting is complete and the mould is dried and backed by slowly heating it to about 200ºC in a conveyer oven.

Ceramic Moulding : In ceramic moulding, a thick slurry consisting of specially developed ceramic aggregates and a liquid chemical binder (alcohol based silicon ester) is poured over the reusable split and gated metal pattern which is usually mounted on a match plate.

Vacuum Process : In this process the mould is made from reclaimable dry sand and is vacuum sealed in a plastic film. Due to application of vacuum the surface finish is excellent and vacuum holds the mould rigid during the pouring and solidification of casting.

Permanent Mould Casting : While in the sand casting the moulds are destroyed after solidification of castings, the moulds are reused repeatedly in the permanent mould castings. This requires a mould material that has a sufficiently high melting point to withstand erosion by the liquid metal of pouring temperature, high enough strength not be deform in repeated use and high thermal fatigue resistance to resist premature crazing (the formation of thermal fatigue cracks) that would leave objectionable marks on the finished castings.

Pressed Castings : It is another method of producing hollow castings from permanent moulds but differs from gravity die casting and slush casting in operation. In this case a definite amount of molten metal is poured into the mould and then close fitting cores are pushed in the cavities, so that the molten metal can be forced into the mould cavities.

Posted Date: 2/8/2013 5:04:12 AM | Location : United States







Related Discussions:- Mould casting, Assignment Help, Ask Question on Mould casting, Get Answer, Expert's Help, Mould casting Discussions

Write discussion on Mould casting
Your posts are moderated
Related Questions
#question ...THE APPLICATION AND OPERATION OF ZENER DIODES

Discuss some features of Pentium series of microprocessors. The Pentium is a CISC microprocessor, 32-bit superscalar.  The term superscalar is utilized for the processor that

A bus is a collection of conducting lines that carrier's data, address, & control signals. A bus is two or many wire communication technique. A bus which communicate among two

how unbalanced effect in wave winding is considered to be balanced?

Q. Illustrate the principle of alignment? Pieces of highly permeablematerial, such as iron, situated in ambientmediumof lowpermeability, such as air, in which a magnetic field

Explain the properties and application of glass. Glass: Ordinary glass is a fine insulator but is too brittle to be used for anything although scientific instrument parts, accu

Network analysis software: GIS with a socket for network analysis software (Sec. 11.4) and availability of load related data from AMR based meter data acquisition system will

Name the various magnetically hard alloys. Several of the magnetically hard materials are rare earth carbon steel, cobalt, tungsten steel, alnico, hard ferrites and cobalt stee

Q. Consider themagnetic circuit of Figure. Let the cross-sectional area AC of the core, be 16 cm 2 , the average length of the magnetic path in the core lC be 40 cm, the number

1.  Establish importance of Distribution Planning with help of suitable example.     2.  Explain different distribution planning methods.       3.Explain the six level interv