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

Use of a microprocessor and a microcontroller, Question: a) Differenti...

Question: a) Differentiate between the prime use of a microprocessor and a microcontroller. b) Describe why the design approach of the microcontroller must mirror that of t

Exhaust jet mixing - aircraft design, Exhaust Jet Mixing: Figure shows ...

Exhaust Jet Mixing: Figure shows that the noise from the exhaust jet is the main contributor to the total noise generated by a low by-pass ratio turbo-fan. For a turbo-jet the

Homework, What are the no-arbitrage lower bound, and the no-arbitrage upper...

What are the no-arbitrage lower bound, and the no-arbitrage upper bound, of the vertical spread C(k1) - C(k2) ?

Infiltration enters, ways via which infiltration enters a sewer system

ways via which infiltration enters a sewer system

International financial management , explain the funcyions and structure of...

explain the funcyions and structure of foreign exchange market.

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

Clipper and clamper, i want 5 question for clipper and clamper along with t...

i want 5 question for clipper and clamper along with their solution

Compton''s effect, When a beam of monochromatic x ray is incident on a grap...

When a beam of monochromatic x ray is incident on a graphite block, it get scattered and scattered wavelength is larger than that of the incident radiation wavelength. This scatter

Npv of an mba, Create an excel spreadsheet estimating NPV of an MBA

Create an excel spreadsheet estimating NPV of an MBA

Static aeroelasticity, An object, such as an aerofoil, moving through a flu...

An object, such as an aerofoil, moving through a fluid disturbs the surrounding flow field. The fluid velocity varies along the aerofoil surface creating a variation in pressure as

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