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Eligible Candidates Will Be Able To Apply For This National Level Exam Which Is The Gateway To Admission Into M.C.A. Courses In The 10 Participating NITs. Mca Entrance Coaching In Ranchi, Nimcet Entrance Coaching In Ranchi. Top Mca Entrance Coaching Institute For Bca Studying Students In India Join With The Best Coaching Institute For Mca Entrance Coaching Call 9818003202 Master Of Computer Applications (MCA) Is A Three Year Long Professional Post-Graduate Program For Candidates Wanting To Delve Deeper Into The World Of Computer Application Development With The Help Of Learning Modern Programming Language. The Program Is A Blend Of Both Theoretical And Practical Knowledge. An Mca Degree Endows Students' An Opportunity To Work With Tools Meant To Develop Better And Faster Applications.
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What is the "Casting" Process !!! and how these are performed ???

Casting is a fabrication process whereby a totally molten metal is poured into a mold cavity having the desired shape; upon solidification, the metal assumes the shape of the mold but experiences some shrinkage. 

Casting techniques are employed when (1) the finished shape is so large or complicated that any other method would be impractical, (2) a particular alloy is so low in ductility that forming by either hot or cold working would be difficult, and (3) in comparison to other fabrication processes, casting is the most economical. 

Furthermore, the final step in the refining of even ductile metals may involve a casting process. A number of different casting techniques are commonly employed, including sand, die, investment, and continuous casting. Only a cursory treatment of each of these is offered.

                                                

                                                   

INVESTMENT CASTING

For investment (sometimes called lost-wax) casting, the pattern is made from a wax or plastic that has a low melting temperature. Around the pattern is poured a fluid slurry, which sets up to form a solid mold or investment; plaster of paris is usually used. The mold is then heated, such that the pattern melts and is burned out, leaving behind a mold cavity having the desired shape. This technique is employed when high dimensional accuracy, reproduction of fine detail, and an excellent finish are required—for example, in jewelry and dental crowns and inlays. Also, blades for gas turbines and jet engine impellers are investment cast.

 

CONTINUOUS CASTING

At the conclusion of extraction processes, many molten metals are solidified by casting into large ingot molds. The ingots are normally subjected to a primary hot rolling operation, the product of which is a flat sheet or slab; these are more convenient shapes as starting points for subsequent secondary metal-forming operations (i.e., forging, extrusion, drawing). These casting and rolling steps may be combined by a continuous casting (sometimes also termed ‘‘strand casting’’) process. Using this technique, the refined and molten metal is cast directly into a continuous strand which may have either a rectangular or circular cross section; solidification occurs in a water-cooled die having the desired cross-sectional geometry. The chemical composition and mechanical properties are more uniform throughout the cross sections for continuous castings than for ingot-cast products. Furthermore, continuous casting is highly automated and more efficient.

 In previous blog, we have discussed about the other casting processes..you can read the blog at here

 https://academyofengineers.blogspot.com/2020/06/what-is-casting-process-and-how-these.html

For more engineering topics or query : contact us

 

What is the "Casting" Process !!! and how these are performed ???

                                               

Casting is a fabrication process whereby a totally molten metal is poured into a mold cavity having the desired shape; upon solidification, the metal assumes the shape of the mold but experiences some shrinkage. Casting techniques are employed when (1) the finished shape is so large or complicated that any other method would be impractical, (2) a particular alloy is so low in ductility that forming by either hot or cold working would be difficult, and (3) in comparison to other fabrication processes, casting is the most economical. Furthermore, the final step in the refining of even ductile metals may involve a casting process. A number of different casting techniques are commonly employed, including sand, die, investment, and continuous casting. Only a cursory treatment of each of these is offered.

                                    

SAND CASTING

With sand casting, probably the most common method, ordinary sand is used as the mold material. A two-piece mold is formed by packing sand around a pattern that has the shape of the intended casting. Furthermore, a gating system is usually incorporated into the mold to expedite the flow of molten metal into the cavity and to minimize internal casting defects. Sand-cast parts include automotive cylinder blocks, fire hydrants, and large pipe fittings.

 

DIE CASTING

In die casting, the liquid metal is forced into a mold under pressure and at a relatively high velocity, and allowed to solidify with the pressure maintained. A two-piece permanent steel mold or die is employed; when clamped together, the two pieces form the desired shape. When complete solidification has been achieved, the die pieces are opened and the cast piece is ejected. Rapid casting rates are possible, making this an inexpensive method; furthermore, a single set of dies may be used for thousands of castings. However, this technique lends itself only to relatively small pieces and to alloys of zinc, aluminum, and magnesium, which have low melting temperatures.

In next blog, we have discussed about the other casting processes..

you may read the blog in detail

https://academyofengineers.blogspot.com/2020/06/what-is.html

For more engineering topics or query : contact us

 

 

 

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Microprocessor Micro-Controller And Interfacing Tutorial Class

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