ABRASIVE PROCESS AND BROACHING
1. What is broaching?
Broaching is a processes of
machining a surface with a special multipoint cutting tool called ' broach'
which has successively higher cutting edges in a fixed path.
2.Indicate any two specification of a broaching
machine?
1.Maximum length of stroke in mm
2.Maximum force developed by the slide in tones
3.What are the advantages and limitation of
broaching?
Advantages:
1.Roughing, semi finishing &
finishing cuts are completed in one pass of the broach 2.Broaching can be used
for either external or internal surface finish
Limitation:
1.High initial cost of the broach tool compare to other tools
2.Job work or batch work is not advisable due to the high tool
cost.
4.What are the different operations that can be
performed on a broaching machine?
1.Broaching splines
2.Broaching a key way
5.What are the advantages of gear planning
process?
Any given module can be cut using a single cutter.
The rate of production is higher
when compared to forced cutter method. It is a simple flexible and accurate
method of generating gears.
6.What are the limitations of gear hobbing?
1.Internal gears cannot be generated.
2.Hobbing process cannot be applied very near to shoulders
7.State the purpose of grinding?
1.To remove small amount of metal from work pieces &
finish then to close tolerances.
2.To obtain the better surface finish.
The
machining accuracy of holes produce by this machine tool lies with in a range
of 0.0025 mm.
8.
Define the term “grade” used in grinding wheel?
Grade or hardness indicates the strength with
which the bonding material holds the abrasive grain in the grinding wheel.
9. What
is meant by dressing &truing?
The process of loading &breaking away the
glazed surface so that new sharp abrasive particles are again present to work
for efficient cutting is called dressing.
Truing is
a process of trimming the cutting surface of the wheel to run true with the
axis.
10. What
is process of lapping?
Lapping is a surface finishing process used for
producing geometrically accurate flat, cylindrical &spherical surfaces.
11.What
are the three types dividing heads?
1.Plain
or simple.
2.Universal.
3.Optical
12.What
are the other forming methods for manufacturing gears?
1.Gear cutting by single point form tool. 2.Gear cutting by
shear speed shaping process. 3.Gear broaching.
4.Template
method.
13.List the gear generating process?
1.Gear shaping process.
2.Gear planning process.
3.Gear hobbing process.
14.Mention the applications of gear shaping
process?
1.Gear shaping used for generating both internal &
external spur gears. 2.Helical gears can
also be generated using special attachments.
15.What are the limitations of gear hobbing?
1.Internal gears cannot be generated.
2.Hobbing process cannot be applied very near to shoulders.
16.What are the advantages of gear planning
process?
1.Any given model can be cut using a single cutter.
2.It is a simple flexible &accurate method of generating
gears.
17.List the various gear finishing processes?
1.Gear
shaving. 2. Gear
burnishing.
2.Gear
grinding. 4.Gear
lapping.
18. How the centre less grinder operates?
The centre less grinder operates
with two wheels as the cutting wheel, to remove the excess stock and a
regulating wheel which is used to control the speed of rotation of the work and
the rate of feed.
19. What are the advantages of centre les
grinding?
The work pieces are suppressed through the wheels
No tendency for chatter and deflection of the work piece. Easy
size control of the work.
No need of chucking or mounting of the work piece.
20. What is honing?
Honing ids
also a surface finishing process like grinding, which uses a “hon” tool that
consists of stones to abrade the metals.
21. What is meant by polishing?
Polishing is the surface
finishing operation performed by a polishing wheel, for the purpose of removing
appreciable metal to take out scratches, hole marks, Pits and other defects
from rough surfaces.
22. What is meant by buffing?
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