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

Survey, Operations invending in chain survey

Operations invending in chain survey

Vibration analysis of aircraft, Vibration Analysis Gas turbine engines ...

Vibration Analysis Gas turbine engines have extremely low levels of vibration compared to piston engines. Changes in vibration levels could occur therefore without being notic

Water chemistry, distinguish between priming and foaming

distinguish between priming and foaming

Evolutionary methods, Evolutionary Methods Optimization methods base...

Evolutionary Methods Optimization methods based upon natural or biological processes Need to be able to parameterise a solution and determine a cost function (good or bad

Beam theory method , Here, it is assumed that the crack is effectively long...

Here, it is assumed that the crack is effectively longer than the value measured on the side of the specimen. If one assumes that it is longer by an amount Δ, then the new crack le

Aad instruction, Ask question #Minimum 100 words acexplanation of aad with ...

Ask question #Minimum 100 words acexplanation of aad with examplescepted#

Aerospace propulsion systems, Aerospace propulsion is essentially based on ...

Aerospace propulsion is essentially based on Newton'slaws of motion (1687): • A body on which there is no resultant force will move ina straight line with constant velocity.

Mine Surveying.., Question 1 (100 marks) As Surveyor in charge of an underg...

Question 1 (100 marks) As Surveyor in charge of an underground mine you have been instructed to design a tunnel to join a crosscut to a haulage drive. The details of the crosscut a

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