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.
advantages and disadvantages of coupling and cohesion
how to use mean and standard deviation with matlab?
Non-discounted cash flow method, Payback period method In this method, time value of money is not considered. It takes into account the number of years required to recover the in
easy defination of zener diode nd its application and characteristics ?
the amount of cold working metal can withstand is directly related to which properties? name two and also discuss the effect that cold working has upon these properties?
notes on non tilting concrete drum mixers
Material Used for Patterns : The common materials of which the patterns are made of the following : 1. Wood: The common woods are : (i) Pine
compression of gas turbine
Radar Systems Radar is an acronym for RAdio Detection And Ranging. A radar uses an antenna to transmit a series of electromagnetic waves or pulses, and an antenna (usual
I need help in doing a project in excel that has everything about drilling like mud pump etc ..
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