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

Fire risk assessment - fire protection engineering, What is a fire risk ass...

What is a fire risk assessment? Fire Risk Assessment (FRA) can mean different things to different people.  Here we will look at the understanding in the UK and the understandin

Numerical methods, Numerical solutions to equations: Many practical p...

Numerical solutions to equations: Many practical problems in engineering involve complex boundary conditions and variable properties that cannot be solved analytically, creat

Noise reduction in aircraft design, Noise reduction The problem of engi...

Noise reduction The problem of engine noise has always been associated with aircraft. Increases in engine power have given rise to increases in noise and the indications are t

Clippers, WHAT IS THE DIAGRAM OF TWO LEVEL CLIPPER WITHOUT REFERENCE AND EX...

WHAT IS THE DIAGRAM OF TWO LEVEL CLIPPER WITHOUT REFERENCE AND EXPLAIN

Asteroid belt, Why is there an asteroid belt? - Rocky planetismals survive...

Why is there an asteroid belt? - Rocky planetismals survived in the asteroid belt between Mars and Jupiter because they did not grow together into a planet. - Jupiter’s gravity, t

Tin smelting, How can calculate for charging of tin smelting with reverbera...

How can calculate for charging of tin smelting with reverberatory furnaces?

Electro-mechanical fuel control, Electro-mechanical fuel control: The s...

Electro-mechanical fuel control: The start fuel valve and ignition are energised as soon as rotation (3%) is sensed by an Electronic Sequence Unit (ESU). At 14% and with risin

Tube drawing, Drawing operation can also be used for reducing the tube cros...

Drawing operation can also be used for reducing the tube cross-section. The drawing equipment consists of draw bench and die. One end of the tube is pulled through the die over a f

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