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

Personal Financial Management Math College Level, How do you find initial m...

How do you find initial monthly payment for the second year after an adjustable-rate mortgage?

Electronic , how to work ever moll models

how to work ever moll models

FSE, A W12x40 beam is heated to 760°C. Answer the following questions. Wh...

A W12x40 beam is heated to 760°C. Answer the following questions. What is the W/D factor for sprayed protection? What is the W/D factor for box type protection? What is the spe

Memory card functiOn, How does small memory card can read all photos and vi...

How does small memory card can read all photos and videos and saves by using what?

Mergers Acquisition Pooling of interests method, Mergers Acquisition Merge...

Mergers Acquisition Mergers and acquisitions involve complex accounting treatment a merger, defined as amalgamation in India, involves the absorption of the target company by the

Dsp, relationship between z plane and s plane in bilinear transformation me...

relationship between z plane and s plane in bilinear transformation method

Control engineering, what are the components, applications, benefits and dr...

what are the components, applications, benefits and drawbacks of control engineering?????

Dsp, need a topic for small project using dsp

need a topic for small project using dsp

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