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

Blow moulding and thermoforming process, Q . Write short note on blow moldi...

Q . Write short note on blow molding. OR Explain the Thermoforming process.   What are the plastic fabrication method write in brief with neat sk

Signal modulation, Signal modulation Modulation involves the modificati...

Signal modulation Modulation involves the modification of some property of a (usually sinusoidal) carrier waveform. The process of recovering the original signal from the modul

Flight control - linear system, Representations of a linear system The ...

Representations of a linear system The linear system of Section is shown in block diagram To determine the responseof the output of the system y(t) to an input u(t) the initial

Communications system, Communications System • Information Source - ...

Communications System • Information Source - Information may take many forms: data, image, voice, video • Transmittter - Processes information into a form suitable for

Final project, can u give idea about project in agriculture

can u give idea about project in agriculture

Thermodynamics, original temp. of plate is 25 degree c.when put in burnace ...

original temp. of plate is 25 degree c.when put in burnace its upper part is 250 c and lower is 100 and mass is 56kg.find out heat transfer

Time value money, I want to buy a car. The Msrp is $31,000. I pay $516 per ...

I want to buy a car. The Msrp is $31,000. I pay $516 per month for five years. The quoted apr is 6.9%. I put down $800. How much did I pay for the car?

Guidance control system, Guidance Control system The control aspect...

Guidance Control system The control aspect of the guidance system is intended to stabilise the behaviour of the airframe.  The fact that the guidance system will always h

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