The Lost-wax method, sometimes, too called only equally precision-investment casting has been used for many years past times jewelers in addition to dentists. Since world-war-II, the method has been adapted to the production of pocket-sized in addition to precise, industrial fasting. Basically, the method involves the purpose of expendable (heat disposable) designing unrounded alongside a crunch of refractory textile to cast the casting mould. Example: Piston making.
Cast parts are formed past times putting the molten metallic inward the cavity. The wax designing is melted in addition to it is non reusable because of that the method is named "lost - wax method".
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The steps involved inward this Lost Wax Method method are explained below:
- Wax injection
- Assembly
- Shell building
- Dewax
- Conventional casting
- Knockout
- Cut-off
- Finished castings
(b) Multiple Patterns are assembled inward fundamental wax sprue .
(c) The assembly is immersed inward a liquid ceramic slurry. After that this construction is dipped into a bed of really fine sand. More than ane layer of sand may live necessary.
(d) The ceramic becomes dry. The wax is in addition to so melted. To melt all the wax ceramic is fired.
(e) Simple gravity pouring is used for filling the mould. After solidification all the parts of the ceramic construction buy the farm casting. Hollow castings tin live made past times pouring out the extra metallic earlier solidification.
(f) The metallic cools to room temperature in addition to afterwards that the ceramic construction is broken off past times H2O blasting or past times applying vibration.
(g) The parts are separated past times the high speed friction saw. Minor finishing is given to the parts.
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Advantages of Investment Casting Method:
- Intricate details tin live cast.
- Undercuts in addition to other shapes, which would non allow the withdrawal of a normal pattern, are easily obtained.
- The surface is really smoothen in addition to at that topographic point is no parting line.
- High accuracy tin live obtained so that much of complicated in addition to costly machining tin live eliminated.
- Unmachinable alloys tin live cast.
- More than ane casting tin live made at a time.
- It tin live reused.
- Preferred for casting weight less
- It is involved in addition to thence expensive
- It has limitations inward purpose of in addition to place of holes
- The parts are express inward size to a few kg
- Parts for aerospace industry
- Parts for computers
- Parts for nutrient in addition to beverage
- Costume jewellery
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