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

Telecom engg, the project those see in the matlab project which in the voic...

the project those see in the matlab project which in the voice of different birds

Automatic synchronising - propellers, AUTOMATIC SYNCHRONISING: Automa...

AUTOMATIC SYNCHRONISING: Automatic Synchronisation uses engine driven synchronising alternators to detect electrically any increase or decrease in a slave engine's speed.  Ea

Refrigeration, can liquid reciever determine amount f refrigerant charged i...

can liquid reciever determine amount f refrigerant charged into the system

Lamination of plastics, Q. Write short note on laminating.           ...

Q. Write short note on laminating.                                                 OR    Explain the Laminating processes.

Tool life, hi I''m doing research in tool life of solid carbide endmills ...

hi I''m doing research in tool life of solid carbide endmills and I was looking at your formulas. I was wondering if tell me or where I can find the data required for these formu

Need answers in an excel spreadsheet, 1 Scott Investors, Inc., is consideri...

1 Scott Investors, Inc., is considering the purchase of a $447,000 computer with an economic life of five years. The computer will be fully depreciated over five years using the st

Home inventory system, Software House PLC (SHP) is a pan European software ...

Software House PLC (SHP) is a pan European software development group that operates in the UK and the European Union. The company develops and markets off the shelf & bespoke softw

Jfet self biasing, VDD=20V,RG=1MOHM,RD=3.3KOHM,RS=1KOHM,IDSS=8MA,VP=-6V

VDD=20V,RG=1MOHM,RD=3.3KOHM,RS=1KOHM,IDSS=8MA,VP=-6V

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