Define: i) Impression; ii) Locating ring; iii) Spacer block;
[3 marks]Fill in the blanks:
[4 marks]Core and cavity is made out of small steel block, is called as ______ ii) ______ receives the plastic melt from the machine nozzle. iii) _______ gate is used for single impression tubular shaped moldings. iv) ______ ejection is used for thin walled components.
[ marks]Explain the construction details of three plate mould with neat figure.
[7 marks]List different types of ejection system.
[3 marks]What are the main differences between two plate and three plate mould?
[4 marks]Explain cooling insert-bolster assembly.
[7 marks]Explain cooling integer type mold.
[7 marks]Describe split mould.
[3 marks]List the different types of split mould actuation methods.
[4 marks]Explain finger cam actuation with neat figure.
[7 marks]Describe angled-lift splits.
[3 marks]Explain guiding & retention of splits.
[4 marks]Explain dog-leg cam actuation with neat figure.
[7 marks]What are the different methods of thread forming?
[3 marks]Explain briefly unscrewing type mold systems.
[4 marks]What are the different types of multi daylight mould?
[7 marks]Discuss about the feed system.
[3 marks]What are the alternative designs of moulds for internal threaded components for withdrawing the moulding?
[4 marks]Calculate runner efficiency for fully round, half round, trapezoidal, modified trapezoidal, hexagonal, rectangular and square gates. Page 1 of
[2 marks]What are the stages involved in extrusion die design procedure?
[3 marks]How the extrusion dies are classified?
[4 marks]Calculate the volumetric output of extruder & velocity of melt for the following: Extruder size = 65mm; Extruder output = 60 kg/hr; Outside diameter of pipe = 90mm; Thickness of pipe = 4.5mm; Material = HDPE; Density of Solid = 0.955 g/cc; Density of melt = 0.81 g/cc;
[7 marks]Discuss about sprue pullers.
[3 marks]Explain briefly about hot runner mould.
[4 marks]Explain in-line or straight-through dies. Page 2 of
[2 marks]