Gravity die casting

Gravity die casting

1. Presentation on Gravity Die Casting Presentation By- Saliganti Shiva Kumar M.Tech-1 st Year FFT (2018-20) NIFFT Ranchi

2. INTRODUCTION: Gravity die casting (or) Permanent mold casting uses mold which is permanent . Molten Metal is poured into mold under gravity only, no other pressure is applied to pour the molten metal . However liquid metal solidifies under pressure of metal in the risers .

3. Permanent molds: These are made of dense, fine grained, heat resistant cast iron, steel, bronze, aluminium , graphite or other suitable refractories. This is made into two halves in order to facilitate the removal of casting from the mold . This is designed with horizontal or vertical parting line like as in sand molds . Pouring cup , sprue, gates and riser are built in the mold halves itself. The two mold halves are securely clamped together before pouring.

4. Cores for this type of casting used is metal generally or dry sand. For facilitating the removal of metal cores , surfaces should have a draft of at least 3 to 5 degrees. Molds using dry sand cores or shell cores are known as semi- permanent molds. Dry sand cores positioned and supported in core prints. Cores for permanent molds

5. This coating is nothing but refractory coating. After the mold surfaces have been heated to the required temperature , a refractory coating is sprayed on the mold cavity . Chills: A chill is used to promote directional solidification. These are mostly pieces of Cu , Brass or Aluminium and are inserted into the mold’s inner surface . Coatings:

6. Permanent mold casting production:

7. Carburetor bodies Hydraulic brake cylinders Refrigeration castings Oil pump bodies Aircraft and missile castings Applications:

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