Riser design, Other Engineering

Assignment Help:

A riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the mould cavity is filled up. Risers serve a dual function. They compensate for solidification shrinkage which is a very common casting defect and are a heaf source so that they freeze last and promote directional solidification.

Types of Risers : There are two types risers :Top or open risers and side or blind risers.

Riser shape and Size : The metal in the riser should remain in the molten state for a longer time than in the mould cavity.

It means a heaf looses in riser should therefore be kept to a minimum. It means a riser most freeze more slowly than the casting. Those there shape should be such as to give volume-to-surface-area ratio a maximum value. This ratio is maximum for a sphere. Therefore this is the ideal shape of a riser.

As regards the height of the riser, it must be fall enough to ensure that any pipe formed in it does not penetrate the casting.


Related Discussions:- Riser design

Bjt, why we use h for bjt

why we use h for bjt

Finance, et C(K) denote a European vanilla Call option with strike price K....

et C(K) denote a European vanilla Call option with strike price K. Assume that all options are identical except for strike price, and strike prices satisfy (K1) What are the no-a

Electrometallurgy, explain electrometallurgy for metal extraction process u...

explain electrometallurgy for metal extraction process using a schematic diagram

Financial engeneering, “A swap bank has to entail certain risks which are i...

“A swap bank has to entail certain risks which are inherent to the swap business and are interrelated” Explain the risks involves in swap business.

Ticket EM134795S38_1, Do you receive my payment $480 for the Ticket EM13479...

Do you receive my payment $480 for the Ticket EM134795S38_1 today Feb 20/2017? Please inform me to know. My Email is: Thank you

Capacitive transducers, Capacitive transducers Consider a capacitor con...

Capacitive transducers Consider a capacitor consisting of two parallel conducting plates with an insulator in between. Its capictance is C = ε 0 ε r  A/d where ε

Fuel system inhibiting, Fuel system inhibiting. The fuel used in turbi...

Fuel system inhibiting. The fuel used in turbine engines usually contains a small quantity of water which, if left in the system, could cause corrosion. All the fuel should th

Salvage value Terminal cash flows, Terminal cash flows Salvage value Sal...

Terminal cash flows Salvage value Salvage value (SV) is the most common example of terminal cash flows. Salvage value may be defined as the market price of an investment at the

Enthalpy, What is the deference between enthalpy anne internal energy u

What is the deference between enthalpy anne internal energy u

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd