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

Abrasive grit, Abrasive Grit This method of compressor cleaning involve...

Abrasive Grit This method of compressor cleaning involves injecting an abrasive grit into the engine at selected power settings ( Figure 21.30.)grit used may be ground walnut s

Engineering mechanics questions, I need help in engineering mechanics quest...

I need help in engineering mechanics questions? Do you provide homework help, Please let us know how do i get it quich time...

Nash equilibrium, how to get ns2 coding for nash equilibrium

how to get ns2 coding for nash equilibrium

Blade twist - aircraft engine, BLADE TWIST: Rotational velocity and its...

BLADE TWIST: Rotational velocity and its effect on the Angle of Attack depends on the radius of the blade element in question. A blade element near the blade root (hub) will h

Exhaust duct arrangement in aircraft, Exhaust duct arrangement in Aircraft:...

Exhaust duct arrangement in Aircraft: Exhaust ducts are invariably positioned to ensure that on the ground as the hot gases are directed away from the maintenance crews and air

Finding depreciation and amoritizaton, EBITDA is 7.5 million, Net income is...

EBITDA is 7.5 million, Net income is 1.8, 2.0 million is interest expense, corporate tax is 40%. What is the Depreciation and amortization?.

DSP HW1, With x[n] denoting the input signal and y[n] denoting the output s...

With x[n] denoting the input signal and y[n] denoting the output signal, give the difference equation relating the input signal to the output signal in the discrete-time domain, gi

Propeller, asymmetric effect (p-factor)

asymmetric effect (p-factor)

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