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GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – I • EXAMINATION – SUMMER 2015
Subject Code: 3361902 Date:02-05-2015
Subject Name: Tool Engineering
Time: 10:30am to 1:00pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable & Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
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Q.1 Answer any seven out of ten. 14
1. State any four basic functions of tool engineering.
2. Write universal acts and their elements.
3. Why tungsten, vanadium and molybdenum are added in tool material?
4. Which geometric elements are to be considering during resharpening of the twist drill bit?
5. Write four basic differences between machine tools and cutting tools.
6. Write use of tennon and setting block in design of fixture.
7. State application of angle plate jig and box jig?
8.Define burr clearance and tool setting with respect to jig and fixture?
9. During blanking and piercing press tool operations, clearance should be given to die or punch? Why?
10. How press tonnage is calculated during cutting die design?
Q.2 (a) “Tool engineering is a link between product design and manufacturing it”. Explain this statement. 03
OR
(a) Enlist functions to be performed under process planning. 03
(b) Write steps of resharpening for end mill cutter. 03
OR
(b) State ISO designation for carbide inserts with type of materials. 03
(c) Explain 3-2-1 principle of location in jig and fixture design. 04
OR
(c) Write principle of clamping in jig and fixture design. 04
(d) Define following terms: 1] die clearance 2] press tonnage 3] spring back effect 4] bend allowance. 04
OR
(d) Explain shear action in die cutting operation. 04
Q.3 (a) Write name and use of tool holding systems used on drilling machine tool. 03
OR
(a) Enlist only desired properties of cutting tool materials. 03
(b) Write short note on “edge bending die.” 03
OR
(b) Write short note on “single action drawing die.” 03
(c) Write applications of curling die. 04
OR
(d) Write general aspects of cutting die design. 04
OR
(d) Enlist different types of pilots as a die accessory and write their function and material of construction. 04
Q.4 (a) List and explain factors to be considered in tool design. 03
OR
(a) State types of cutting dies and write one use of each die? 03
(b) Write purpose for using jig and fixture in modern industries. 04
OR
(b) Write short note on “welding fixture.” 04
(c) For a component shown in figure 1… 07
a] Select suitable drill jig to drill 4 holes of 8 mm diameter and justify your selection.
b] Draw freehand assembly sketch of selected drill jig.
c] Draw details sketches of main elements of drill jig with necessary dimensions.
OR
(c) Design a suitable milling fixture for a component shown in figure 2 for producing a through slot of 8 mm X 6 mm size on a M.S. rod. Draw assemblysketch of selected fixture. Also draw details sketches of main elements of selected fixture with necessary dimensions.
Q.5 (a) Refer Figure 3 and answer the following questions for designing a progressive cutting die. 07
a] Find dimensions of punch and die and show on sketch?
b] Calculate centre of pressure for given component.
c] Write “rule of thumb method” for die block design.
d] Sketch scrap strip layout and find percentage utilization.
(b) 1] Why clamping system is needed even after using locating system to hold/locate the job?
2] Why C-washer is used along with captive C-clamp during designing jig and fixture? 04
(c) Explain degree of freedom and write its importance. 03
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