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

Propeller construction, PROPELLER CONSTRUCTION METAL PROPELLERS Mo...

PROPELLER CONSTRUCTION METAL PROPELLERS Most metal propellers have forged alloy blades protected from corrosion by anodising and often further protected by polyurethane en

Aircraft Propulsion, An aircraft is flying at a speed of 500 ft/s an altitu...

An aircraft is flying at a speed of 500 ft/s an altitude of 20,000 ft, where the atmospheric temperature and pressure are 447.3°R and 972.5 lbf/ft2, respectively. If the inlet / di

Car parking control system programming, I have to develop a program for car...

I have to develop a program for car parking control system program on assembly language using AT89C51,please help me with it

Measurement uncertainty, Real measurements never deliver the true value of ...

Real measurements never deliver the true value of the physical quantity or measurand. The measurement uncertainty consists of a random error and a systematic error. Most of the err

Balanced investment strategy, Balanced Investment Strategy Portfolio manage...

Balanced Investment Strategy Portfolio management strategy where all assets are owed with the aim of avoiding excessive risk by diversifying investment athwart different asset clas

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

VDD=20V,RG=1MOHM,RD=3.3KOHM,RS=1KOHM,IDSS=8MA,VP=-6VFINDIDQ,VGSQ,VDS,VG,VD

Production Inventory Control, Modular Forniture Company manufactures two ki...

Modular Forniture Company manufactures two kinds of couches: Suede and Leather. The forecasted demand for

Shrinkage cavities casting defects, Q.   Discuss briefly the causes and rem...

Q.   Discuss briefly the causes and remedies of Shrinkage cavities casting defects.                                                 OR  Why shrinkage cavities are caus

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