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

Gutter fill, calculations about gutter fill?

calculations about gutter fill?

MBA Financial management, Need urgent help with Financial Management homewo...

Need urgent help with Financial Management homework assignment - evaluating company "Billabong". Due Fri 8 June (Sydney, australia time).

Determine energy emissions per capita, What is the energy related CO 2 emi...

What is the energy related CO 2 emissions per capita and per $1,000 of GDP? Add the point representing Florida on the Energy CO 2 intensity graph in Appendix. How does it

Vectors or matrices matlab, Vectors or matrices MATLAB can make and ope...

Vectors or matrices MATLAB can make and operate arrays of 1 (vectors), 2 (matrices), or more measurements. In the MATLAB language, a vector represents a one perspective (1×N or

What is the difference between real money & nominal money?, What is the dif...

What is the difference between real money & nominal money?  Moderate cash is relevant to the evaluate of keeping track of. nominal figure is what is published on the expenses. w

Architecture.., draw folded plate roof structure on multi purpose hall?

draw folded plate roof structure on multi purpose hall?

LAVOISIER LAPLACE''S LAW, GIVE EXPLANATION HOW THIS IS USEFUL IN APPLICATIO...

GIVE EXPLANATION HOW THIS IS USEFUL IN APPLICATION OF THERMODYNAMICS TOWARDS CHEMICAL PROCESS

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