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

Paint, What are the ingredients of paint. Explain?

What are the ingredients of paint. Explain?

Gated pattern, Gated pattern is used to produce good casting. It is esse...

Gated pattern is used to produce good casting. It is essential to make sure that full supply of molten metal flow into every part of the mould. Provision for easy passage of the

Statistical Quality control, Pls solve the problem 13-7 in Statistical Qual...

Pls solve the problem 13-7 in Statistical Quality control by Montgomery

Npv, Problem 1 Suppose a company is considering two independent projects, P...

Problem 1 Suppose a company is considering two independent projects, Project A and Project B. The cash outlay for Project A is $14,000. The cash outlay for Project B is $20,000. T

Swell Factors, The effect of swell factors on volumes

The effect of swell factors on volumes

Co-ordination number, Q.  Define co-ordination number. Ans.CO-ORDINAT...

Q.  Define co-ordination number. Ans.CO-ORDINATION NUMBER: The number of atoms which are directly surrounding a given atom is known as coordination number. Number of atoms w

Electron gun, Electron gun: The electron gun consists of the following:...

Electron gun: The electron gun consists of the following: 1.  Cathode:  An indirectly heated cathode (negatively biased w.r.t. the screen). 2.  Grid:          A cylindric

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