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2003 Course Mould & Die Design

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Total No. of Questions : 10] P1523 [Total No. of Pages : 4 [3764]-354 B.E. (Polymer) MOULD AND DIE DESIGN (2003 Course) Time : 4 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer question 1 or 2 and 3 or 4 from Section I. Answer 5 or 6, and 7 or 8 and answer question 9 or 10 from Section II. 2) Figures to the right indicate full marks. 3) Use of calculator, log paper and log-log paper is allowed. 4) Draw neat sketches wherever required. 5) Assume suitable design data, if required. SECTION - I Q1) a) b) Q2) a) b) Q3) a) b) Design and draw a two cavity two plate mould for the component shown in Fig. 1. Draw at least two views with one cross sectional view to bring out all the details of feed system, ejection system and cooling system. Material : HDPE. Cavity pressure = 300 kg/cm2. [35] Calculate and justify the size and type of runner and gate used in (i) above. [5] Design and draw a two Cavity three plate mould for the component as shown in Fig. 2. Draw at least two views with one sectional view to bring out all the details of feed, ejection and cooling system. Material : ABS Cavity pressure : 300 kg/cm2. [35] Calculate and justify the size and type of runner and gate used in (i) above. [5] Draw neat sketches of any two plastic products which require split mould construction. Indicate clearly on the drawing split portion. [6] Explain with a neat sketch spring loaded plunger design for split safety. [4] Q4) List the various methods for split actuation. Explain any one in detail with a neat sketch. [10] P.T.O. SECTION - II Q5) a) Write a process sheet for parallel blocks. Assume the drawing and details. Also give process sheet for locating ring assuming suitable drawing. Draw neat sketches of parallel block and locating ring. [10] b) Explain why it is important to maintain parallelity of mould faces. [6] Q6) a) Explain the process of wire cutting EDM. [8] b) Explain polishing and buffing operations. [4] c) Discuss mould maintenance practices. [4] Explain antechamber nozzle design with a neat sketch. [8] Q7) a) b) Explain various types of shut off valves used in hot runner moulds with neat sketches. [8] Q8) a) State important design features and factors taken into account for hot runner moulds. [8] Give merits of hot runner mould over underfed moulds. [4] Explain how expansion of manifold is taken care of in hot runner mould design. [4] b) c) Q9) Write in short about different types of blown film dies. Draw neat sketches. Write in short about major parts and their function. [18] Q10)a) Draw a neat proportionate sketch of cross head type pipe die and write in short about major parts and their function. [10] b) Give mathematical formulae for pressure drop due to shear, due to elongation and pressure drop at entry in case of wedge shaped die. [8] Y [3764]-354 2 [3764]-354 3 [3764]-354 4

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