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

Thermo electric thermometer, how thermoelecteric thermometer is contructed ...

how thermoelecteric thermometer is contructed and how it working

GSM BASED MOTOR ON AND OFF, in this project i want to start my motor by giv...

in this project i want to start my motor by giving a miscall so how can i decode that miscall in micro controller?

Math algebra calcilus, I am having difficulty with algebra pertaining toeng...

I am having difficulty with algebra pertaining toengineering

Matrix laboratory solutions, Matrix laboratory solutions with matlab assign...

Matrix laboratory solutions with matlab assignment help MATLAB (matrix laboratory) is an exact processing atmosphere and fourth-generation selection terminology. Designed by Nu

Logic gate - nand gate, NAND Gate; When constructing a NAND gate using ...

NAND Gate; When constructing a NAND gate using transistors as the switching devices, the output often represents the 'inversion' of the "AND" gate. Figure 4 shows an example o

Thermodynamics, original temp. of plate is 25 degree c.when put in burnace ...

original temp. of plate is 25 degree c.when put in burnace its upper part is 250 c and lower is 100 and mass is 56kg.find out heat transfer

Survey, what are the obstacles which are likely to encounter chain survey a...

what are the obstacles which are likely to encounter chain survey and how to overcome them.

Illustrate flat plate collectors. Describe liquid fl, Illustrate flat plate...

Illustrate flat plate collectors. Describe liquid flat plate collector with relevant diagram.

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