Question 1 (20 marks) Figure 3 shows an injection molding machine. Injection molding is an example of a conventional powder metallurgy technologies that is widely known for its capability in producing near-net shapes at high production rates. Feed hopper Heaters Cylinder for screw-ram Motor and gears for screw rotation Injection unit Barrel Stationary platen Reciprocating screw Mold Movable platen Tie rods (4) Clamping Nozzle cylinder Nonreturn valve Hydraulic cylinder Clamping unit Figure 3: Injection molding machine a) Identify the TWO units in the injection molding, as shown in Figure 2. Explain the function and differences of EACH unit. (4 marks) b) As an engineer, identify THREE parts in EACH units you answered in 2a) that have the tendency to initiate any undesirable issues that may interrupt the production cycle. Your answer must state the possible issues arise from each part. (6 marks) c) Apart from injection molding, suggest ONE advanced manufacturing process that uses the technologies of powder metallurgy. Your answer must describe the processing steps, the common materials, advantages and application of that advanced manufacturing process. (10 marks)

Fig: 1