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.
explain the fibre optic communication system with block diagram
Interest Rate Calculations In considering the time value of money, it is convenient to represent mathematically the relationship between the current or present value of a sing
With the help of circuit diagram and the waveforms,explain the working of a negative clipper with positive biasing voltage.also explain the Same concept in series clipper circuit
Causes of unbalance Unbalance may be caused by a variety of factors occurring singly or in combination with others. These factors include:- a) Eccentricity Eccentricity
Q. What are the secondary operations we apply in powder metallurgy methods. Give their use also. Ans. Secondary Processes of Manufacture : In addition to the basic proce
Apu powerplant installation: The APU engine mounts consist of a number of supports with vibration isolators fitted to the end of each support. The tubular supports are bolted
I''m trying to figure out how to use a for and while loop to: print each word found in 4 columns across the output page, in the order they were found. This means you must print the
what is meant by VMOS
Industries that manufacture racing cars prefers nickel based alloys for engine components and iron based alloys for structural parts. Justify this statement.
what is the role of iodoform in chemistry?
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