basic information about various super-finishing processes like lapping, polishing, honing, buffing.

1. Super finishing
processes
A.D.I.T
Mechanical department
PREPARED BY:DHIREN P PATEL
5TH SEM MECH.ENGG.
(120013119002)

2. WHY SUPER FINISHING
REQUIRED
Parts Worn Out Fast Due To Defects Of
Grinding Operation. The Defects Are Chatter
Marks, Helical Type Scratches, Surface
Cracks, Smear Metal Etc. Are Responsible
For Wearing Out The Parts. In Certain
Circumstances High Surface Quality Is
Required. Hence For Removing Grinding
Defects, To Obtain Desired Surface Finish
And To Improve The Geometrical Shape
Finishing Processes Are Used. It Includes
Honing, Lapping, And Super Finishing.

3. FINISHING METHODS
• With material removal – generative methods
-fine machining, honing, super finishing, lapping
• Without material removal – forming method
-glazing, blasting, tumbling, polishing

4. TYPES OF SUPER FINISHING
PROCESS
• Honing
• Lapping
- Hand Lapping
- Machine Lapping
• Super Finishing

5. HONING
• Hole made by boring is obtained to
required dimension and finishing by
honing. In this process abrasive
stone is used. The dimension to an
accuracy of 0.005 mm can be
obtained by honing process

6. • Honing is wet cutting
process. 6 to 8 honing sticks
are held together and metal
is removed by rotating or
reciprocating the holder.
• Honing tool is rotated at a
speed of 0.5 - 2.5 m/s and
reciprocates at a speed of
0.2 – 0.5 m/s.

7. • Objectives are achieved by honing
1.
2.
3.
4.
Metal is removed
Roundness & straightness is obtained
Accurate dimension is obtained
Required surface finish is obtained.
•Application :
-Honing Of Automobile
Cylinder
-Honing Is Also Used For
Repair Work

8. LAPPING
• This process mainly done on the
meting surfaces. Abrasive
compound or solid bonded
abrasive is used in it. More
accuracy is obtained as heat &
pressure are less in lapping.
Lapping compound is made by
mixing diamond, silicon
carbide, aluminum oxide in oil or
water. There are many types of
lapping process.

9. HAND LAPPING
• In this method lapping
compound is spread on cast
iron plate and work piece is
moved manually on it on a
path like English figure - 8

10. Machine lapping
• In this method a rotating table
is used in place of the plate.
Again the work piece to be
lapped is given rotary by a
cage and rotated on the
surface of the table. Rotating
lap is used above & below the
work piece to produce parallel
surfaces.

11. Application of lapping:-
- Machine lapping process is carried out for gauge
blocks, piston pin, ball bearings and engine valves.

12. SUPER FINISHING
• This process is one type of
honing , in which as compared
to the honing less
pressure, high speed, huge
amount of lubricant – coolant of
low viscosity and more contact
area between work & abrasive
face is kept. Less heat is
produced during super finishing
and it is generally done on
external surfaces.

13. POLISHING
• Abbrasive material is bond
to a tool (disc, belt) or it is a
media (paste) freely between
tool (textile disc, belt) and
part
• NO improve in shape or
accuracy!!
• Just improves the surface
quality

14. Thank you