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

Financial management, Sharpe Knife Company expects sales next year to be $1...

Sharpe Knife Company expects sales next year to be $1,500,000 if the economy is strong, $800,000if the economy is steady, and $500,000if the economy willb e strong, a 50 percent pr

Geology, write and explain the different geophysical methods

write and explain the different geophysical methods

Accelerated Slipstream, Does the accelerated slipstream create more lift on...

Does the accelerated slipstream create more lift on part of a wing behind the propeller of a multa-engine aircraft? If so, about how much % for an Air King b200? Also the V-22 O

Line the crown of the tunnel, A 10m diameter circular tunnel is to be excav...

A 10m diameter circular tunnel is to be excavated in a jointed ground.  The joint sets spaced at 6m are dipping towards the West at 50°.  A horizontal circular tunnel is to be cons

Double cantilever beam, Double Cantilever Beam In the double cantilever...

Double Cantilever Beam In the double cantilever configuration, the ends of the sample are pulled apart, forcing a crack to propagate down the beam from one end. The figure belo

Qualitative risk assessment - fire protection engineering, Qualitative risk...

Qualitative risk assessment - fire protection engineering: NFPA 551 discusses the differences between qualitative risk assessment and quantitative risk assessment. Qualitat

Invalidation of certificate of airworthiness, INVALIDATION OF CERTIFICATE O...

INVALIDATION OF CERTIFICATE OF AIRWORTHINESS Listed below are the four major reasons why a Certificate of Airworthiness could become invalid. There may be other specific reason

Hazard in dpsd, obtain the hazard free circuitfor Boolean expression.f=(0,2...

obtain the hazard free circuitfor Boolean expression.f=(0,2,4,5,8,10,14) and also implement the NAND implementation for the circuit

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