Rajasthan Technical University 2010 B.Tech Mechanical Engineering Machining & Machine Tools (mechanical Engg.) - Question Paper
RTU Machining & Machine Tools (mechanical Engg.)
Rajasthan tech. University
B.tech four sem (Main/back)
Year July 2010
Roll No. :__Total Printed pages : | 3
4E2052 B.Tech. (Sem. IV) (Main/Back) Examination, July - 2010N
O
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Mechanical Engineering
4ME4 Machining & Machine Tools
Common for Mech., P & i & Automobile Engg.
Time : 3 Hours] [Total Marks : 80
[Min. Passing Marks : 24
Attempt any five questions. Selecting one question from each unit. All questions carry equal marks. (Schematic diagrams must be shown wherever necessary. Any data you feel missing suitably be assumed and stated clearly. Units of quantities used / calculated
must be stated clearly.)
Use of following supporting material is permitted during examination. (Mentioned in form No. 205)
1.____Nil__2._NiL
rcos a
1 (a) Prove that tan (J)
-r sin a
6
(b) In an orthogonal turning following observations were obtained:
Cutting force = 120 kg, Feed force 30 kg Back rake angle = 15, Feed rate 0.2 mm/rev Chip thickness 0.3 mm, cutting speed 100 m/'min Work piece dia = 120 mm, depth of cut = 0.4 mm Calculate :
(1) Chip thickness ratio
(2) Shear angle
(3) Coefficient of friction
(4) Friction angle
(5) Shear stress
(6) Shear strain
(7) Strain energy.
10
4E2052] IIIIHIIIIIIIHIIIIIIII 1 [Contd...
2 (a) Explain the importance and functions of different tool angles and other parameters associated with the geometry of a single point cutting tool.
10
(b) Explain the various tool materials with merits, drawback and applications.
6
UNIT-II
3 (a) What are the various mechanism of tool failure ? Explain
each with the help of neat sketch.
8
(b) Explain the term machinability and machinability index hence find out machinability index of mild steel, stainless steel and copper.
4 (a) What are the various factors affecting tool life.
4
(b) The following data were recorded while turning a work piece on lathe :
Cuting speed = 25 m/min Feed rate = 0.3 mm/rev Depth of cut = 2.0 mm Tool life = 100 min
Tool life equation is given by VT 012y 7 d3 -q
If the cutting speed, feed and depth of cut is increased by 25% each and also collectively what will be their effect on the tool life.
12
UNIT-III
(a) What is difference between a capslan and a turret lathe ? Explain with the help of suitable sketches.
(b) . What are the main parts of turret and capstan lathe ?
Describe in brief with the help of neat sketches.
8
4E2052] ll'lllljillll llllll 2 [Contd.
6 (a) What do you understand by 'Grain' 'Grit' "Structure" and grade of a grinding wheel ? What are common wheel shapes used in grinding ? Why 'tsueing' and 'dressing' of grinding wheel in necessary.
(b) Explain following with neat sketches :
(i) Bench and pedestal grinder
(ii) Swing frame grinder
(iii) Portable and flexible grinder
(iv) Belt grinder.
16
UNIT-IV
7 (a) What do you mean by thread cutting and thread chasing ?
Explain thread cutting on lathe by taking suitable example.
10
(b) Explain following terms with respect to thread manufacturing :
|
(i) |
Pitch |
|
(ii) |
Minor diameter |
|
(m) |
Major diameter |
|
(iv) |
Pitch diameter |
|
(v) |
Depth of thread |
|
(vi) |
Thread angle. |
8 (a) What are the various methods by which Gear. can be manufactured. Explain any one process in detail.
10
(b) Explain various process by which gear are finished. Give one process to finish Gears.
UNIT-V
9 (a) What do you mean by High velocity forming ? What are
various method by which high energy rate forming is done ?
6
(b) Explain in detail of the explosive forming.
10
10 (a) What do you mean by Industrial safety in industries ?
6
(b) Write down the procedure to reduce the industrial noise in a optimum way.
10
4E2052] || II J | UN U || 3 [ 4800 ]
4E2052*
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Attachment: |
| Earning: Approval pending. |
