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 formation of newton''s ring in reflected light. Prove that the radius of the bright rings are proportional to the square root of the positive odd interger
general energy equation, non- flow energy equation, steady flow equation, joule''s law
Combination clipper
conclusion
you are a young entrepreneur & you have to compete with already established firms in the industry by taking help from marginal costing tools with adequate examples. you have to giv
Q. What is crystal imperfection? Briefly discuss all types of point defects in crystals. Ans. The various type of crystal imperfection are as follows: (1) Point de
what are basic think to select the bjt as switch
Expertsmind.com brings you unique solution in electrical engineering Class A Amplifier Operation Class A amplifiers are biased so that variations in input signal polarit
explain ramp type
It consists o a source of x ray, with a number of collimated slits. Crystal under investigation is mounted on a table, and the position of this table can be recorded on vernier sca
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