Define : Mould, Sprue, Runner
[3 marks]Discuss requirements of a Runner
[4 marks]For the product shown in fig [a], design a hand injection mould. Show calculation of sprue, Runner and Gate assuming a 2 impression mould.
[7 marks]Fill in the blanks: 1. Runner exhibiting highest efficiency is _____________ 2. Ring gate is used for _________________ 3. Round Edge gate is used for ____________material
[3 marks]Differentiate between Insert Bolster and Integer Moulds
[4 marks]Define Runner efficiency. Calculate efficiency of half round, full round, trapezoidal, square, rectangular runners.
[7 marks]Discuss Pin Ejection in Detail
[7 marks]Write difference between two plate and three plate mould
[3 marks]Differentiate diaphragm and Ring gate
[4 marks]Design a rectangular edge gate for a PE box whose dimensions are : length = 130 mm ; width = 80mm ; depth = 30mm; wall thickness = 2 mm. take n = 0.6
[7 marks]Differentiate between pipe die and film die.
[3 marks]What are the features of a overlap gate?
[4 marks]For the product shown in fig. [A], draw a 2 impression mould showing Plan and Sectional Elevation
[7 marks]Tick the correct answer: 1. Minimum diameter of runner should be [a] 1 mm [b] 3mm [c] 2mm [d] 4mm 2. Sleeve ejection is used for [a] hollow products [b] tall hollow products [c] short hollow products [d] solid products 3. Stripper plate ejection is preferred for [a] deep products [b] multiimpression moulds [c] products with hollow cores[d] products with undercuts.
[3 marks]Draw baffle cooling for cores
[4 marks]Discuss Heat Rods in Detail
[7 marks]What are collapsible cores.
[3 marks]The shot capacity of an Injection moulding machine is 250 gms. It is desired to mould the product shown in fig.[a] on this machine. Work out the no.of impressions that can be moulded on this machine. Bulk factor of PS = 1.4 Bulk factor of PP = 1.9 Specific gravity of PS= 1.04 Specific gravity of PP = 0.9
[4 marks]Discuss Stripper plate ejection in detail
[7 marks]Write Cprogram for plasticizing capacity
[3 marks]Discuss in detail, cooling of Deep Cores
[4 marks]Determine the pitch and the pitch circle diameter for the interconnecting groove design , given the following information: Diameter of insert : 30mm ; Gap between inlet and outlet grooves : 4.5mm ; number of impressions : 12 ; depth of groove : 5mm.
[7 marks]Discuss difference between Finger Cam and Dog Leg Cam
[3 marks]Show the Design of Straight thru Dies.
[4 marks]Discuss Collapsible Core Design with a sketch
[7 marks]