Die Casting This process is extensively used for casting alloys of zinc, copper,aluminum and magnesium. The dies are typically made of alloy tool steel and are expensive to make. Die cast products Digital camera case Gasoline pump (Magnesium) dispenser(Aluminum) Shanghai Jiao Tong University 16
Shanghai Jiao Tong University 16 Die Casting n This process is extensively used for casting alloys of zinc, copper, aluminum and magnesium. n The dies are typically made of alloy tool steel and are expensive to make. n Die cast products
Die Casting ■Die cast products Engine block(Aluminum) Hand brake lever(Magnesium) Shanghai Jiao Tong University 17
Shanghai Jiao Tong University 17 Die Casting n Die cast products
Die Casting The steps are: 1.Closing and locking the dies 2.Forcing the molten metal into the die and maintaining pressure. 3.Allowing the metal to solidify 4.Opening the die 5.Ejecting the casting Do Castng Water cooled steel mold Hydroulic -The piston forces the actuated piston metal into the mold undar Metal is roured into the shot cylinder great pressure.The mold is opened and the casting is ejected. Shanghai Jiao Tong University 18
Shanghai Jiao Tong University 18 Die Casting The steps are: 1. Closing and locking the dies 2. Forcing the molten metal into the die and maintaining pressure. 3. Allowing the metal to solidify 4. Opening the die 5. Ejecting the casting
Die Casting Die casting machine一cold chamber(冷压 室压铸机) Movable Fixed die halt die half Ejector Ladle pins Cavity Ram Shot chamber Shanghai Jiao Tong University 19
Shanghai Jiao Tong University 19 Die Casting n Die casting machine — cold chamber（冷压 室压铸机）
Investment Casting Mold to make patterr The investment casting process or the h lost wax process(失蜡铸造)consists of:: 1.Producing a master die made of metal. 2.Producing wax patterns by pouring or Injertitg wax pattern or glastic pattern Pecting pattern injecting molten wax into the die under (Tree pressure and allowing it to harden. 3.Assembling the wax patterns into a pattern assembly or tree. 4.Repeated dipping and coating the assembly with a fine ceramic slurry. Stirry coatiag 3coG1螺 Completed mold 5.Allowing the coating to dry. 6.Heating the coated tree (autoclaving) to melt out the wax and leave a shell. Cag 7.Pouring molten metal into the shell. 8.Allowing the metal to solidify. xC国 9.Breaking off the shell to reveal the cast Patcomn meltout Pouring Shalcout Patem metal. F1CURE528■ Schematic illustration of investment osting (lost-wex process)Cactings by thit method can be made 10.Separate out the individual castings with vory fine dotail and from a varioty of metals.Souree:Stual Founders'Socoty of America. Shanghai Jiao Tong University 20
Shanghai Jiao Tong University 20 Investment Casting The investment casting process or the lost wax process （失蜡铸造） consists of: 1.Producing a master die made of metal. 2. Producing wax patterns by pouring or injecting molten wax into the die under pressure and allowing it to harden. 3.Assembling the wax patterns into a pattern assembly or tree. 4. Repeated dipping and coating the assembly with a fine ceramic slurry. 5. Allowing the coating to dry. 6. Heating the coated tree (autoclaving) to melt out the wax and leave a shell. 7. Pouring molten metal into the shell. 8.Allowing the metal to solidify. 9.Breaking off the shell to reveal the cast metal. 10.Separate out the individual castings