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

Matlab codes for extended kalman filter, I would like to have simple matlab...

I would like to have simple matlab codes for measuring the changes in amplitude and frequency of pure sinusoidal signal in a disturbed environment and subsequently to show the resu

Static and dynamic balancing - propellers, STATIC & DYNAMIC BALANCING ...

STATIC & DYNAMIC BALANCING STATIC BALANCE When the weight distribution about the propeller axis is equal, with the propeller in any position, it is said to have static bal

Chains of inference, Chains of Inference Now we look at how to get an a...

Chains of Inference Now we look at how to get an agent to verify a given theorem using several search strategies. In previous lectures we have noted that, to specify a search p

End centered tetragonal lattice in the bravis list, Q.  There is no end ce...

Q.  There is no end centered tetragonal lattice in the bravis list, but there is an end centered orthorhombic lattice. Explain why this is so? Ans.  A tetragonal system is

Extended input facilities, Extended input facilities Another instance w...

Extended input facilities Another instance where multiple inputs to a single gate operation can occur is with certain types of gate elements that have an 'EXTENDED INPUT' facil

Armature cipl, in which type of armature winding Equaliser ring dummy coils...

in which type of armature winding Equaliser ring dummy coils are used

Pressure filter - aircraft maintenance , PRESSURE FILTER The pressure o...

PRESSURE FILTER The pressure oil filter housing contains a wire-wound or mesh, Paper or felt elements and incorporates a by-pass valve. The filter housing can be drained inde

FOCP, THE USER INTERFACE

THE USER INTERFACE

Development of surfaces, a hexagonal prism of 40mm side length of base and ...

a hexagonal prism of 40mm side length of base and height 80mm is resting on HP on its base with two edges of base is parallel to horizontal plane. A square hall of equally inclined

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