Riser design, Other Engineering

Assignment Help:

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.


Related Discussions:- Riser design

Acfi385, Seven years ago, after 15 years in public accounting, Stanley Book...

Seven years ago, after 15 years in public accounting, Stanley Booker, CPA, resigned his posiition as Manager of Cost Systems for Davis, Cohen, and O''Brien Public Accountants and s

Traffic management, (a) Discuss the requirements, specifications and specia...

(a) Discuss the requirements, specifications and special requirements for the  design of arterial road networks and residential area street networks in a developing suburban region

Full-authority digital electronic control, Full-authority digital electroni...

Full-authority digital electronic control: The supervisory control was a step toward the full-authority, fully redundant EEC. It controls all engine functions and eliminates th

Calculate pi for infinite series, Write a program to calculate from the i...

Write a program to calculate from the infinite series: Print a table showing the value of approximated by one term, two terms, three terms, four terms, and so on from th

Assignment, Financial Management, Finance This case has been framed in orde...

Financial Management, Finance This case has been framed in order to test the skills in evaluating a credit request and reaching a correct decision. Perluence International is large

The finite element method fem, The finite element method The fini...

The finite element method The finite element method (FEM), sometimes referred to as finite element analysis (FEA), is a computational technique used to obtain approximate

LAVOISIER LAPLACE''S LAW, GIVE EXPLANATION HOW THIS IS USEFUL IN APPLICATIO...

GIVE EXPLANATION HOW THIS IS USEFUL IN APPLICATION OF THERMODYNAMICS TOWARDS CHEMICAL PROCESS

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd