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

Control surfaces , Control Surfaces  As with a flight control system...

Control Surfaces  As with a flight control system, a guidance algorithm uses control surfaces to control the behaviour of an airframe.         - Rudder, ailerons, elev

Survey of manufacturing, Survey of Manufacturing : A usable product is man...

Survey of Manufacturing : A usable product is manufactured in the following sequence. Ore from Earth → Reducing processes → Molten metal → Commercial Castings → Ingots → Furth

Strain hardening, Q. Define the concept of strain hardening. Ans. S...

Q. Define the concept of strain hardening. Ans. Strain hardening or work hardening in metal occurs because of interaction between the this location and some of obstruction.

VISIBLE LIGHT COMMUNICATION, Ask question #Minium 100 words accepted#RELATE...

Ask question #Minium 100 words accepted#RELATED QUESTION THAT CAN BE ASKED IN DEFENSE

Process control, sir how can I find the transfer function of control valve

sir how can I find the transfer function of control valve

Engineering machnics, a part of machine has a reciprocating motion which is...

a part of machine has a reciprocating motion which is simple harmonic making 200 complete oscillations in a minute.the part weight 45 N.determine the accelerating force upon it

Detection and removal of shadow from an image, plz give an exact method for...

plz give an exact method for the detection and removal of shadow from an image

Oil pressure warning light in aircraft, Oil pressure warning light: Oil...

Oil pressure warning light: Oil pressure is also monitored by an oil pressure switch that puts a light on when the oil pressure reaches a low level. The light is usually red an

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