Why we need additives explain, Mechanical Engineering

Assignment Help:

Q. Why we need additives explain?

Additives are the materials added in small quantities to the moulding sand in order to enhance its exiting properties and to impart to it special properties. These additives may be necessary to give a good surface finish to the casting or to eliminate casting defects that's arise from either the expansion of the moulding sand as it is heated or the contraction of the casting as it cools in the mould. There may be some overlapping between an additive and a binder because many people include organic binders also in the category of additives. Metal penetration or burning on is penetration of metal between sand grains and also strong adhesion of the fused or sintered sand to the metal of the casting surface. The burnt on sand involves difficulty in cleaning operations and is responsible for rapid wear of cutting tools used to machine the castings.


Related Discussions:- Why we need additives explain

Reassembly position of critical parts services tips, Reassembly Position of...

Reassembly Position of Critical Parts:  Care should be taken to note the position of the unidirectional parts while dismantling the engine. This will ensure dimensions (depth, dis

Determining the largest eigenvalue, The Power Method is a classic numerical...

The Power Method is a classic numerical algorithm for determining the largest eigenvalue and eigenvector associated with a matrix A. Write a matlab function that returns the larges

Sound waves in gases, Sound Waves in Gases Sound waves are longitudinal...

Sound Waves in Gases Sound waves are longitudinal pressure waves. Let us consider the motion of a plane sound wave moving along  X-axis  in a gas medium. In undisturbed positio

Show automation inspection and test plan, Q. Show Automation Inspection and...

Q. Show Automation Inspection and Test Plan? Automation Inspection and Test Plan review and Automation Materials Test Results review shall be by Automation Engineering, or by /

Determine least value of work, Determine least value of work: Q . De...

Determine least value of work: Q . Determine least value of W as shown in the figure given below to keep the system of connected bodies in equilibrium µ for surface of c

Determine the interface temperature, A steel pipe with 50 mm OD is covered ...

A steel pipe with 50 mm OD is covered with a 6.4 mm asbestos insulation followed by a 25 mm layer of fiber-glass insulation [K = 0.0485 Wmk]. The pipe temperature is 393 K and the

Access considerations for plant design, Q. Access Considerations for plant ...

Q. Access Considerations for plant design? Plant facilities shall be provided with acceptable access and egress for personnel, materials, and equipment by using access ways, ro

Find increase in the length of bar, Find increase in the length of bar: ...

Find increase in the length of bar: Q: Find increase in the length of bar of uniform section because of self weight. Sol.: Take a bar of cross sectional area A and leng

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