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2003 Course Die & Mould Design (Elective I)

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Total No. of Questions : 12] P1335 [Total No. of Pages : 4 [3764]-195 B.E. (Production S/W) DIE AND MOULD DESIGN (411122) (2003 Course) (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) From Section-I solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, and from SectionII solve Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.12. 2) Answers to the two sections should be written in separate answer book. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I UNIT - I Q1) a) Explain briefly the theories of plastic yielding. b) Explain defects their causes and remedies in rolling. [8] [8] OR Q2) a) Explain the following. i) CCD. ii) [8] Shape Factor. iii) Porthole dies. iv) Hooker s Process. b) Derive the equation for drawing stress developed during operation.[8] UNIT - II Q3) a) What is OBI? Explain its working with merits and demerits. [8] b) How presses are classified on the basis of frame? Explain with neat sketch. [8] P.T.O. OR Q4) a) Explain difference between compound and combination die with neat sketch. [8] b) What is strip layout? What factor should be considered for drawing strip layout? And what are the different types of strip layout? [8] UNIT - III Q5) Design a blanking die for the component shown in Figure 1. a) Draw strip layout and find out material utilization. b) Find out press tonnage with full shear. c) Design blanking die and draw the same. d) Draw neat sketch of press tool. [4] [4] [4] [6] OR Q6) Design a progressive die for the component shown in Figure 2. Given: Stock thickness = 1 mm, Shear strength of material = 198 MPa. a) Draw best strip layout and find material utilization. [4] b) Find out press tonnage with staggering for above layout. [4] c) Design and draw die block. [4] d) Draw assembly drawing. [6] [3764]-195 -2- SECTION - II UNIT - IV Q7) Explain the following. [16] a) Isothermal forging and its advantages. b) Upsetting c) Forgability OR Q8) Explain the following. [16] a) Effect of grain flow lines in forging. b) Powder forging. c) Orbital forging. UNIT - V Q9) Explain with neat sketch: [16] a) Transfer moulding. b) Blow moulding. c) Injection moulding for thermoplastics. OR Q10) a) Explain difference between thermosetting plastic and thermoforming plastic. [8] b) How injection moulding machines are specified? [8] Q11) Design an integer injection mould for the component shown in fig. 3. [18] [3764]-195 -3- OR Q12) a) What is bolster? What are their functions? Explain different types of bolster with neat sketch. [10] b) Explain any four types of gate with neat sketch. rrr [3764]-195 -4- [8]

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