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

Cash Flows Components, A typical investment will have three components of c...

A typical investment will have three components of cash flows: • Initial investment • Annual net cash flows • Terminal cash flows. Initial investment Initial investme

Transistors, Transistors: The transistor can be a high or low resistanc...

Transistors: The transistor can be a high or low resistance device, hence the name, which is derived from TRANSfer resISTOR.  It is used in many switching and amplifier circ

Propeller control, Propeller Control: There is no separate propeller co...

Propeller Control: There is no separate propeller control selector for this engine / propeller combination. Instead of a separate propeller control lever, the governor is desi

Naked short selling, are retail investors or traders permitted to naked sho...

are retail investors or traders permitted to naked short a stock? who is permitted to naked short a stock assuming there has been no suspension of this practice and following the f

Radar engineering, Calculate the maximum range when radar operates at 10GHz...

Calculate the maximum range when radar operates at 10GHz and has peak power=10 Mwatt,S/N ratio=10dB,antenna cross section=100 mm2,target cross section=10mm2.The gain of transmittin

Unit operations , Can you guys Solve Unit Operations Problems in Chemical e...

Can you guys Solve Unit Operations Problems in Chemical engineering

Working of i.c. engine, WORKING OF I.C. ENGINE Basically there are 2 ty...

WORKING OF I.C. ENGINE Basically there are 2 types of internal combustion engines; the two stoke type and the 4-stroke type. A brief description of these is given below: 1.

Shell moulding process merits and demerits, Q. Describe shell moulding proc...

Q. Describe shell moulding process merits and demerits . Ans. Shell moulding process           Merits                                                   (i) Bett

Principles of jet propulsion, Principles of Jet Propulsion: Newton 's...

Principles of Jet Propulsion: Newton 's Laws of Motion. To understand the basic principles of jet propulsion it is necessary to understand the practical application of Sir I

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