Investment & permanent casting
- 2. Group MeMbers Muneeb Ali Khan Waqas Ahmed Muhammad Umair SUPARCO Institute Of Technical Training
- 3. Topics Investment Casting Permanent Mold Casting Core Sand Molding Construction of Cupola Furnace
- 4. CastingCasting is a manufacturing process in which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. is a manufacturing process in which a wax pattern is coated with a refractory ceramic material. Once the ceramic material is hardened its internal geometry takes the shape of the casting. The wax is melted out and molten metal is poured into the cavity where the wax pattern was. o Investment casting
- 5. Advantages and Disadvantages of investment casting •Excellent surface finish •High dimensional accuracy •Extremely intricate parts are castable •Almost any metal can be cast •No flash or parting lines •It can be difficult to cast objects requiring cores. •This process is expensive, is usually limited to small casting, and presents some difficulties where cores are involves •Investment castings require longer production cycles compared to other casting processes
- 6. Permanent mold casting It is a metal casting process that employs It is a metal casting process that employs reusable molds ("permanent molds"), usually made from metal. reusable molds ("permanent molds"), usually made from metal. The most common process uses gravity to fill the mold, however The most common process uses gravity to fill the mold, however gas pressure or a vacuum are also used.gas pressure or a vacuum are also used. ApplicAtion (1) Gears (2) Wheels (3) Housings (4) Engine components
- 7. Advantages and disadvantages • Reusable mold • Good surface finish, • Good dimensional accuracy • High production rates. • Low labor cost • Scrap can be recycled • High tooling cost • Limited to low- melting-point metals • Short mold life
- 8. Core sand molding The sand use for the preparation of core is different from the mold sand. It is prepared y special processes like baking ,etc. Similarly the sand use for the preparation of mold in core sand molding is same as that of the core
- 9. BENIFITS It is highly refractory as it is baked in ovens When we have to cast such object which has very high molten temperature then we use this type of molding technique
- 10. Furnace:-Furnace:- An enclosed chamber in which heat is produced to heat buildi ngs, destroy refuse, smelt or refine ores, etc. CCupola Furnaceupola Furnace:-:- Cupola was made by Rene-Antoine around 1720. Cupola is a melting device. Used in foundries for production of cast iron. Scrap of blast furnace is re melted in cupola. Large cupolas may produce up to 100 tons/hour of hot iron.
- 11. Parts of CuPola Spark arrester Charging door Air box. Tuyere Tap hole Slag hole