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
Design 2:1 MUX with strobe input using NAND gates

Q. Describe the four main methods of strengthen crystalline materials against plastic yield. Ans. (1) Work Hardening: Strain hardening or work hardening is a phenomenon which

how thermoelecteric thermometer is contructed and how it working

A car battery is of 12 v. eight dry cells of 1.5 v each connected in series can give 12 v. but such cells are not used in starting a car. why?

give a criticalanalysis of a zener diodedata with suitable chracteristicsand applications

This is an individual task in the form of an essay of between 900 and 1300 words. Illustrative material such as pictures may be included in addition to the text.

Matlab is a 4th technology selection language, which is designed by The MathWorks. It provides an exact processing atmosphere. Matlab works a variety of math features like design o

Generally, there are three modes to describe different crack surface displacement in a cracked body. Mode I is opening or tensile mode where the crack surfaces move directly ap