Describe the type of facing and backing sand, Mechanical Engineering

Assignment Help:

Q. Describe the type of Facing and Backing sand?

Facing sand. This sand is used directly next to the surface of the pattern and comes into contact with the molten metal when the mould is poured. As a result, it is subjected to the severest conditions and must possess, therefore, high strength and refractoriness. This sand also provides a smoother casting surface and should be of fine texture. It is made of silica sand and clay, and some additives without the addition of used sand. The layer of facing sand in a mould usually ranges from 25-50mm.


Backing Sand. This is the sand which is used to back up the facing sand and to fill the whole volume of the flask. Old, repeatedly used moulding sand is mainly employed for this purpose.


Related Discussions:- Describe the type of facing and backing sand

State - thermodynamics, STATE - Thermodynamics: The State of system is...

STATE - Thermodynamics: The State of system is its condition or configuration described in detail. State is the condition of the system which is identified by thermodynamic

Parallelograular law of forces and triangular of forces, two forces are act...

two forces are acting at a point''o'',determine magnitude and direction by using parallelogram law of forces and triangular law of forces

Two position synthesis, Two position synthesis of crank rocker mechanisms

Two position synthesis of crank rocker mechanisms

Explain the feature of screw conveyor, Explain the Feature of screw conveyo...

Explain the Feature of screw conveyor Screw conveyor has such feature as simple structure compact transverse dimension convenient maintenance enclosed delivery and small produc

Manufacturing processes, Manufacturing Processes: Importance of Manuf...

Manufacturing Processes: Importance of Manufacturing: The importance of manufacturing is that a gives usable product from the ore of different metals and from different mate

Literature review on co2 positive displacement pump, How can I get the lit...

How can I get the literature review on fabrication and construction of a modified Co2 single stroke positive displacement pump driven with electric motor

Fuel and steam generator, Boiler efficiency and heat losses, heat Balence s...

Boiler efficiency and heat losses, heat Balence sheet, boiler draught, high pressure boiler

Theory of machine, write short note on''coefficient of insensitiveness''of ...

write short note on''coefficient of insensitiveness''of governors.

Define the skid fabrication, Q. Define the skid fabrication? Unless not...

Q. Define the skid fabrication? Unless noted otherwise in this specification, skid fabrication shall be in accordance with GS-904-0510, GS-904-0511 and GS-904-0515. Dimensio

Explain tee joints, Tee joints -The square tee joint requires a fillet weld...

Tee joints -The square tee joint requires a fillet weld that can be made on one or both sides. It can be used for light or fairly thick materials. For maximum strength, considerabl

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