The document discusses gravity die casting or permanent mold casting, which uses permanent molds made of materials like cast iron or steel to pour molten metal into without external pressure. It describes the design of permanent molds including parting lines, risers, and cores. The summary also lists some applications of permanent mold casting such as carburetor bodies, brake cylinders, and aircraft/missile castings.

1. {
Presentation on
Gravity Die Casting
Presentation By- Saliganti Shiva Kumar
M.Tech-1st 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: