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

patch antenna, how to make patch antenna for wifi applicatoi

how to make patch antenna for wifi applicatoin

Basic engine design considerations, BASIC ENGINE DESIGN CONSIDERATIONS ...

BASIC ENGINE DESIGN CONSIDERATIONS Effect of engine size: The two parameters involved are the diameter, d and stroke, L of the engine. The effect of doubling each of this

Plastics, what are the key polymeric structural features to most elastomer...

what are the key polymeric structural features to most elastomeric material

Sintering, Q. What is sintering ? Explain the stages of sintering. An...

Q. What is sintering ? Explain the stages of sintering. Ans. The operation of heating a green compact to an elevated temperature is known as sintering. It is a process by

Shift registers, Shift registers A register is a number of flip-flops a...

Shift registers A register is a number of flip-flops arranged in a circuit used for storing data.  A shift register is one that is designed to move the data along the register.

Vibrating beam accelerometer, Vibrating beam accelerometer The electrod...

Vibrating beam accelerometer The electrodes are driven by a high frequency voltage (1 MHz). The displacement is measured using a phase detector from the change of capacitance b

Microprocessor, software development cycle for 8086

software development cycle for 8086

Aircraft maintance, Explain different types of intakes of aircraft

Explain different types of intakes of aircraft

The operational amplifier , The operational amplifier : The integrated ...

The operational amplifier : The integrated circuit operational amplifier is one of the most useful and versatile electronic devices available today.  The name 'operational ampl

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