GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Subject Code: 3152309
BE- SEMESTER-V (NEW) EXAMINATION — WINTER 2020
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Subject Name: Plastic Mold & Die Design
Time: 10:30 AM TO 12:30 PM
Date: 03/02/2021
Total Marks: 56
Instructions:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Use Graph paper for drawing of mould
| MARKS | ||
| Q.1 | (a) Define : Mould ; Insert ; Guide pin | 03 |
(b) Fill in the blanks:
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| (c) For the figure shown in fig[a], design a single impression injection mould. Show calculations for feed system in detail. | 07 | |
| Q.2 | (a) Draw cooling channels for Integer Core cooling | 03 |
| (b) Discuss functions of Lathe, Milling, Shaping, Grinding Machines. | 04 | |
| (c) For the mould designed in Q1[c], draw both plan and sectional elevation of the mould. | 07 | |
| Q.3 | (a) Discuss Integer v/s. Insert bolster moulds. | 03 |
| (b) Discuss integer cavity cooling | 04 | |
| (c) Discuss in detail about Heat Rods | 07 | |
| Q.4 | (a) Discuss about Rectangular edge gate and fan gate. | 03 |
| (b) Show cooling of Shallow Cores | 04 | |
| (c) Discuss helical channel Cooling for deep cores | 07 | |
| Q.5 | (a) Discuss about gates that can be used for hollow mouldings. Give advantages and disadvantages. | 03 |
| (b) 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. | 04 | |
| (c) Discuss Stripper plate Ejection in detail | 07 | |
| Q.6 | (a) Discuss about Sprue pullers | 03 |
(b) Tick the correct one:
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| (c) What are collapsible cores? Discuss | 07 | |
| Q.7 | (a) 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 | 03 |
| (b) Calculate the shot capacity of the injection moulding machine if a product of weight 40 gms is to be moulded in ABS and a 16 impression mould is desired. Assume: Bulk factor of PS=1.9 Bulk factor of ABS=1.8 Specific gravity of PS = 1.04 Specific gravity of ABS=1.0 | 04 | |
| (c) Discuss Pin Ejection | 07 | |
| Q.8 | (a) Discuss requirements of gates | 03 |
| (b) Discuss actuating methods of Stripper plates. | 04 | |
| (c) Calculate runner efficiency for Fully Round, Half Round, Trapezoidal, Modified trapezoidal, hexagonal, rectangular and square gates | 07 |
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