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
Combination clipper

i am building the above mentioned system and i intend using an arduino board together with the gsm shield. my problem is i don''t know if there is a way i can control a camera by p

I am looking for a circuit similar to a schmitt trigger which use a varying capacitive input and provided a varying frequency output.

High rise buildings: High rise buildings have their own particular requirements for fire safety and for fire fighting.  Means of escape rely on most people descending the stai

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

how thermoelecteric thermometer is contructed and how it working

An aircraft is flying at a speed of 500 ft/s an altitude of 20,000 ft, where the atmospheric temperature and pressure are 447.3°R and 972.5 lbf/ft2, respectively. If the inlet / di

One thing I have always thought that experienced repair people knew about was circuit analysis. I always imagined that when looking at schematics I would be able to figure the vol

Means of escape - place of safety: The means of escape in a building are often supplemented by a fire warning system that may or may not include automatic detection, depending

how to making terrestrial tele scope an how its work and formulation of terrestrial telescope