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WATER EMULSIFIED PATTERN WAXES
WAXMAG ® -BL / WAXMAG ® -EA:
WAXMAG ®-BL / WAXMAG ®-EA are wax formulations which when emulsified with appropriate quantity of water make ideal pattern waxes for injecting patterns for production of Investment Castings by lost wax process. Suitable emulsifiers have been added into the wax formulations to accept desired quantity of water when mixed.
OPERATION :
MELTING AND EMULSIFICATION :
Melt the wax at the temperature not exceeding 80°C. To molten mass, under gradual stirring, add calculated amount of water to WAXMAG ®-BL or WAXMAG ®-EA amounting to 10% or 20%, respectively based on weight of dry wax. When addition is complete, agitate faster, if possible, holding the mass at steady state temperature of 65 - 70°C, showing signs of emulsification by change in colour.
INJECTION :
Transfer the emulsified wax as required to the injection machine tank where agitation of the wax is again continued. Set the temperature gradient such that it facilitates the nozzle temperature of 50 - 55°C during injection under 250 – 300 lb pressure.
PATTERN ASSEMBLY :
Sprues may be made of non - emulsified wax to prevent water splattering due to excessive heat.
DEWAXING :
Autoclave dewaxing under steam pressure of 5 to 6 atms. at 150 - 160°C will be suitable. Besides, routine checks of ash content, etc., water emulsified wax, after dewaxing must be corrected for water content. This is because water acts as filler mainly responsible for it’s low contraction, negligible sinkage and smooth surface finish.
RECLAMATION :
Dewaxed mass may be ‘very gradually’ heated to boiling under stirring and water totally boiled off by heating upto 150°C. Then, add water, necessary for emulsification as indicated earlier, at temperature not exceeding 100°C, to prevent eruption.