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

Engine lubrication systems - air craft engine , Engine lubrication systems ...

Engine lubrication systems There are basically two types of lubrication system at present in use in gas turbine engines:- a) Recirculatory. In this system, oil is distribut

Risk and return, if we are comparing the risk and return of two stocks. wha...

if we are comparing the risk and return of two stocks. what to calculate, what to analyza and what conclude

Opration research, a note on tracing a closed loop. What are the characteri...

a note on tracing a closed loop. What are the characteristic features of a closed loop?(

Hot section inspections of aircraft, Hot Section Inspections (HSI's) Th...

Hot Section Inspections (HSI's) The hot section includes all components in the combustion and turbine sections of the engine. Scheduled inspections may involve visual inspectio

Java , why we need EJB

why we need EJB

Assgnment, Sulphuric acid can be made with concentration of 99%. However f...

Sulphuric acid can be made with concentration of 99%. However for different industrial process different concentrations are used. For a specific industrial requirement, 62% H2SO4

Econometrics of Financial Derivatives, I''d like to receive a recommended b...

I''d like to receive a recommended book to be able to price fixed income derivatives when there is not already a martet to to calibrate models. I need to use econometrics book to e

Investment allowance, Investment allowance Until a few years ago, a compan...

Investment allowance Until a few years ago, a company could charge an amount equal to 25 per cent of the original value of an asset as investment allowance in the period in which

Fire prevention - fire risk assessment, Fire prevention - fire risk assessm...

Fire prevention - fire risk assessment: Fire prevention measures include: Reducing the combustible materials, Reducing the risk of ignition, Reducing

Mr tiy, Hi, do u help with HYSYS assignment ?

Hi, do u help with HYSYS assignment ?

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