Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
notes on non tilting concrete drum mixers
Equivalent Shaft Horsepower (EHP) In practice there is always a certain amount of jet thrust in the total output of the turbo-propeller engine and this must be added to the s.h
Fix a drawing paper on a drawing board with help of drawing pins. Place a magnetic needle on the drawing paper to identify geographical north and south poles. Mark north, sou
For ramjets, turbojets and turbofans
THE USER INTERFACE
give a criticalanalysis of a zener diodedata with suitable chracteristicsand applications
need help correcting an error on running the developed app it doesnt show the fetched output from internet ?
Removing Aircraft Engines: To prepare an aircraft for engine removal, check that the aircraft weight and balance will not be adversely effected when the engine is removed. Mos
Consider a conical pendulum with a bob of mass m=80kg on a string of length L=10 m that makes an angle of 5 deg. with the vertical. Determine the horizontal and vertical component
whats the gravitational force?
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd