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

Compressibility fluid -aircraft maintenance, Compressibility Fluid: Com...

Compressibility Fluid: Compressible fluid flow refers to the air flow through a gas turbine engine and, because the air is compressible, flow at subsonic speeds causes a change

BIPOLAR AND UNIPOLAR DIGITAL ICs, EXPLAIN THE WORKING OF BASIC N-CHANNEL M...

EXPLAIN THE WORKING OF BASIC N-CHANNEL MOSFET SWITCH

Engineering physics 1, scaning electro microscope,transmission microscope

scaning electro microscope,transmission microscope

Aviation legislation - dealer’s certificate , DEALER'S CERTIFICATE Refere...

DEALER'S CERTIFICATE Reference: When the sale of an aircraft involves flight without a Certificate of Registration, The C.A.A. will permit the aircraft to fly under certain re

Hazard in dpsd, obtain the hazard free circuitfor Boolean expression.f=(0,2...

obtain the hazard free circuitfor Boolean expression.f=(0,2,4,5,8,10,14) and also implement the NAND implementation for the circuit

Find the standard deviation of this portfolio''s returns, Suppose you have ...

Suppose you have $50,000 that you want to invest in two companies, Bethlehem Books and Allentown Audio. Bethlehem has a return of 10% and standard deviation 15%, while Allentown ha

Function ismember - set operations, function ismember - set operations: ...

function ismember - set operations: The function ismember receives two vectors as input arguments, and returns a logical vector which is of similar length as the first argumen

What is the difference between real money & nominal money?, What is the dif...

What is the difference between real money & nominal money? 1) Nominal cash is related to the measure of counting. Moderate figure is what is written on the bill. Whereas actual

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