Plaster molds, Other Engineering

Assignment Help:

           Plastic molds are made of plaster of Paris (gypsum) or calcium sulphate, talc and silica flour is added in the plaster of Paris to improve strength and to control the time required for the plaster to set. These ingredients are mixed with water and the resulting slurry is poured over the pattern.

           The plaster sets within 15 minutes usually. After the plaster sets, the pattern is removed and the mould is dried at 120°C -260°C to remove the moisture. The mould halves are assembled to form the mould cavity and are preheated to about 120°C. The molten metal is then poured into the mould.

           Patterns for plaster moulding are generally made of Aluminum, thermosetting plastics, brass or zinc alloys. Wood patterns are not appropriate for producing a large number of mould because they are repeatedly in contact with the water based plaster slurry.


Related Discussions:- Plaster molds

How does plane diffraction grating forms a spectrum?, Q.  With necessary t...

Q.  With necessary theory explain the formation of spectrum by a plane transmission grating when composite light falls on it OR How does plane diffraction grating for

Electrical de-icing system maintenance, ELECTRICAL DE-ICING SYSTEM MAINTENA...

ELECTRICAL DE-ICING SYSTEM MAINTENANCE: Tests of the system must be carried out when the servicing schedule required it or when a component has been replaced.  Typical tests ar

Demand schedual, How do I create a demand schedual for 1 year?

How do I create a demand schedual for 1 year?

INTERNATIONAL TRADE, AS A CONSULTANT YOU ARE REQUIRED TO HIGHLIGHT THE BASI...

AS A CONSULTANT YOU ARE REQUIRED TO HIGHLIGHT THE BASIS OF INTERNATIONAL AND SHOW WHY YOU WOULD RECOMMEND INTERNATIONAL TRADE TO THE GOVERNMENT OF GHANA

Auto cad, Assignment Title: Die Press Assembly Drawing The objective of th...

Assignment Title: Die Press Assembly Drawing The objective of this assignment is to demonstrate the following concepts of design. • Extrude • Revolve • Fillet • Dimensioning • To

Genetic algorithm procedure, Genetic Algorithm Procedure Generate a ...

Genetic Algorithm Procedure Generate a "pool" of "genes" randomly These genes are then "mated" to produce the "mated" to produce the next generation Best genes have a

Signal modulation, Signal modulation Modulation involves the modificati...

Signal modulation Modulation involves the modification of some property of a (usually sinusoidal) carrier waveform. The process of recovering the original signal from the modul

Inheritance and polymorphism, The objective of this programming assignment ...

The objective of this programming assignment is to experience the use of inheritance in Java and to see how polymorphism works with inheritance in Java. The assignment involves wri

Asp.net, difference between inline code and code behind file in asp.net

difference between inline code and code behind file in asp.net

Important techniques for compacting of metal powders, Q.6 Define powder-met...

Q.6 Define powder-metallurgy. What are various important techniques for compacting of metal powders ? Ans. Powder metallurgy is a technique of producing metal powders and mak

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