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.
Controller Requirements The requirements for the stability and performance of fight control systems are specified in the certi-fication requirements for U.S. civilian aircraft
find IDFT of the sequence X(k)={5,0,1,-j,0,1,0,1,j,0}
According to this it is impossible to specify precisely and simultaneously two physical quantities those are canonically conjugate to each other and the product of the uncertainty
a pilot entering a bay on course 60.3 degrees at speed 12 miles per hour sees a light bearing 37.3 true and 20 minutes later he sees it bearing 20.0 degrees true. if he keeps the
APPLICATION TO THE AXIAL FLOW COMPRESSOR: In order for the compressor to deliver a high mass airflow for a minimum effort required to drive it, it is important that all the com
IGNITION SYSTEMS The outline of a high energy ignition system is illustrated in the figure. Each high energy ignition unit has a low voltage supply which is controlled by the
end cutting angle
explain the objective of capital budgeting
Gravity Die Casting In PERMANENT MOULD CASTING, molten metal is poured under gravity into a metal mould where it remains until it solidifies. The mould is then opened and the
How do you find initial monthly payment for the second year after an adjustable-rate mortgage?
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