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

INTERNATIONAL TRADE, AS A CONSULTANT YOU ARE REQUIRED TO HIGHLIGHT THE BASI...

AS A CONSULTANT YOU ARE REQUIRED TO HIGHLIGHT THE BASIS OF INTERNATIONAL AND SHOW WHY YOU WOULD RECOMMEND INTERNATIONAL TRADE TO THE GOVERNMENT OF GHANA

Mine ventilation assignment, Describe the method of undertaking an anemomet...

Describe the method of undertaking an anemometer traverse for a airflow

Aerodynamic centre, On a typical aerofoil, a point exists about which the r...

On a typical aerofoil, a point exists about which the resultant aerodynamic pitching moment M is independent of incidence. This special point is called the Aerodynamic Centre (AC).

Tools, . An engineering department chair wants to maximize the use of scho...

. An engineering department chair wants to maximize the use of scholarship dollars to shape the enrollment of the incoming freshmen. All applicants take an engineering aptitude t

Static and dynamic balancing - propellers, STATIC & DYNAMIC BALANCING ...

STATIC & DYNAMIC BALANCING STATIC BALANCE When the weight distribution about the propeller axis is equal, with the propeller in any position, it is said to have static bal

Vibration , ME 312 Project: Design for Vibration and Shock Suppression (Due...

ME 312 Project: Design for Vibration and Shock Suppression (Due Sunday 6/5/2012) Introduction To protect the electronic control module from fatigue and breakage, it is desirable

Nomenclature, Nomenclature • Information source device producing inform...

Nomenclature • Information source device producing information to be communicated • Binary digit (bit) fundamental information unit for all digital systems; unit of informat

Assignment, I paid for and attached module 16 for answers this morning but ...

I paid for and attached module 16 for answers this morning but received answers for module 15. How can I get the correct set of answers for module 16 please

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