Basic Process 1; Thermoplastic resin is heated to a molten state 2; It is then extruded through a die head to form a hollow tube called a parison. 3; the parison is dropped between two mold halves, which close around it. The parison is inflated. 5; the plastic solidifies as it is cooled inside the mold. 6; the mold opens and the finishe....
1. Permanent Pattern
a. Sand casting
b. Shell molding
2. Expandable pattern.
a. Investment Casting
b. Expanded polystyrene process (full-mold)
c. Permanent mold casting process
Introduction on Metal Casting CASTING Sand Casting Plaster Mold Casting ....