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

#digital electronics, #Design 2:1 MUX with strobe input using NAND gates

#Design 2:1 MUX with strobe input using NAND gates

Four stroke diesel engine, FOUR STROKE DIESEL ENGINE: T he cycle of ev...

FOUR STROKE DIESEL ENGINE: T he cycle of events that takes place in a four -stroke diesel engine has been shown. Unlike the petrol which drawn in a mixture of air and petrol,

The oil pressure indicator - aircraft engine, The oil pressure indicator : ...

The oil pressure indicator : The oil pressure indicator has a dial normally calibrated in pounds per square inch (psi). The indicator may have max. limit markers, but will alw

Design, 10 vertical examples

10 vertical examples

Air-system in aircraft engine, Air-System in Aircraft Engine: In the wo...

Air-System in Aircraft Engine: In the working cycle and airflow section we discussed the main airflow and working cycle of a gas turbine engine and found that a major function

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

Nozzle guide vane inspection, Nozzle Guide Vane Inspection: Inspection ...

Nozzle Guide Vane Inspection: Inspection of the NGVs is possible using a strong light source and mirror, it is more probable however that a boroscope inspection will be require

Microbiology, Explain the following observations: cells of Escherichia coli...

Explain the following observations: cells of Escherichia coli fermenting glucose grow faster when NO3 - is supplied to the culture and then grow even faster when the culture is hig

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