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

Payback period method, Non-discounted cash flow method, Payback period met...

Non-discounted cash flow method, Payback period method In this method, time value of money is not considered. It takes into account the number of years required to recover the in

Aieee, aieee ka course karne ke liye kya karna padega

aieee ka course karne ke liye kya karna padega

What is the difference between real money & nominal money?, What is the dif...

What is the difference between real money & nominal money? 1) Nominal cash is related to the measure of counting. Moderate figure is what is written on the bill. Whereas actual

Plaster molds, Plastic molds are made of plaster of Paris (gypsum) or calci...

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

Dynamic balancing principles - aircraft maintenance , Dynamic balancing pri...

Dynamic balancing principles: We must all be familiar with the effects of unbalance in one form or another, but perhaps the most common effect is that arising from wheel unbala

Passive clearance control system - aircraft engine, Passive clearance contr...

Passive clearance control system : Compressor discharge air and HP compressor air provide cooling airflow to protect the turbine casing against rapid temperature changes. Th

What is trial balance?, What is Trial Balance?  All business periodicall...

What is Trial Balance?  All business periodically tabulate the charge and credit worthiness stability separately in a declaration to see whether the complete of charge account b

#pareto, how to crate pareto charts eith matlab?

how to crate pareto charts eith matlab?

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