Riser design, Other Engineering

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.

Posted Date: 8/3/2012 1:29:45 AM | Location : United States







Related Discussions:- Riser design, Assignment Help, Ask Question on Riser design, Get Answer, Expert's Help, Riser design Discussions

Write discussion on Riser design
Your posts are moderated
Related Questions
Noise Suppression in Aircraft Design: It has been seen that the first step towards noise suppression is at the design stage of the rotating and static parts of the engine. The


In spot welding, the parts to be joined are normally over lapped. The work piece are clamped between two water cooled copper electrodes. On the passage of a high transient current,

What is a fire risk assessment? Fire Risk Assessment (FRA) can mean different things to different people.  Here we will look at the understanding in the UK and the understandin

HELP IN ELECTRONIC...I AM DOING ELECTRONIC ENG. ... GUIDE ME THE WAY...


Ten Principles of Engineering Economic Analysis 1. Money has a time value. 2. Make investments that are economically justified. 3. Choose the mutually exclusive investment alt

Need help with a timed exam

how will you make finance forecasting ? First I will evaluation the past seasons fiscal reports to get an Idea about the economical functions. Then will talk about with the cont

i want to do aeronautics engg. but my height is only five feet . so can i go in aeronautics