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.
hysteresis loss least epends on
simplify using quine Mccluskey tabulation algorithm and find out the number of primes implicants f(a,b,c,d)=(2.3,4,5,13,15)+d(8,9,10,11) in logic design
Q. What are the limitations of the powder metallurgy process ? How are some of these overcome ? Ans. Limitations : 1. Dies and equipment costs are high. So, the process
Explain the classification of lime
The access time of ROM using bipolar transistors is about
discuss about marine refrigeration
Aggregate properties 1.Aim: To compare the bulk density, voids ratio and angularity number of a nominal single sized aggregate when subjected to different levels of compaction
Plastic molds are made of plaster of Paris (gypsum) or calcium sulphate, talc and silica flour is added in the plaster of Paris to improve strength and to control the time required
what is the basic operation of gas turbine engine?
I have senior design this semester and my professor give my this project. could you help me
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