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

Present worth equivalence in economical engineering, Present Worth equivale...

Present Worth equivalence: Since we have developed the relationship to find a future value F given a present value P, we can easily derive the formula to find a (P|F, i, n), w

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

Reed solomon code, i have created simulink model for rs code with overlapp...

i have created simulink model for rs code with overlapped symbol and without overlapped symbol. and BIT ERROR RATE VERSUS EB/NO PLOT is observed for its performance analysis.but i

Aggregate properties - voids ratio and bulk density, Aggregate properties ...

Aggregate properties 1.Aim: To compare the bulk density, voids ratio and angularity number of a nominal single sized aggregate when subjected to different levels of compaction

Aeroengines - grid conversion, When we solved our simple problem we saw tha...

When we solved our simple problem we saw that the truncation error was O(x) We therefore expect that as the number of grid points is was O(x). We therefore expect that as the numbe

Guidance laws , The guidance law is used to generate a requirement (usually...

The guidance law is used to generate a requirement (usually an required acceleration) that will achieve the guidance objective. In this course, we will look at three main types

Matlab, load flow analysis by fast decoupled method

load flow analysis by fast decoupled method

Water haedness, hardness of bore well water is less than sea water

hardness of bore well water is less than sea water

Techniques of capital budgeting, Techniques of capital budgeting There are ...

Techniques of capital budgeting There are a number of capital budgeting techniques used in the evaluation of a project. They are broadly classified under two categories: 1] Discoun

Difference between income & expenditure statement, Difference between incom...

Difference between income & expenditure statement P&L is to be ready by the Company or Dealing Origination which evolved in Dealing of any commodity or manufacturing of completed e

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