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

Parmpreet, Hi, i want to get a quote for my communication networks assignme...

Hi, i want to get a quote for my communication networks assignment

Defects are likely to result in castings, Q. What kind of defects are likel...

Q. What kind of defects are likely to result in castings due to the following?         (i) Core prints on the core are undersigned.        (ii) Core prints on the core

Virtual prototyping techniques, Virtual prototyping techniques provide uni...

Virtual prototyping techniques provide unique way of interacting with computer data and images. These removes the barriers of key board, monitor and mouse and allow user to experi

Finance ass, Let C(K) denote a European vanilla Call option with strike pri...

Let 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-

Basic engine design considerations, BASIC ENGINE DESIGN CONSIDERATIONS ...

BASIC ENGINE DESIGN CONSIDERATIONS Effect of engine size: The two parameters involved are the diameter, d and stroke, L of the engine. The effect of doubling each of this

Digital electronic.., design a 32:1 multiplexer using 16:1 multiplexer

design a 32:1 multiplexer using 16:1 multiplexer

Computational aerodynamics-guided reading, It is recommended that if possib...

It is recommended that if possible you should buy a copy of this book. It will prove useful for the new fourth year configurational aerodynamics module also. Blackwells bookshop ha

Assembly buildings - fire risk assessment, Assembly buildings: Assembl...

Assembly buildings: Assembly buildings are high life risk premises.  People often very densely occupy such buildings and they do so in large numbers so they must be given good

Oil filter debris analysis, Oil Filter Debris Analysis Oil filters serv...

Oil Filter Debris Analysis Oil filters serve an important function within the lubrication system of a gas turbine engine in that they remove foreign particles that collect in t

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