1. SUBMITTED BY AVINASH SNEHI (1214340049) ME-1 3rd YEAR
GRINDING
SUBMITTED BY
AVINASH SNEHI ( )
ME-1 3rd YEAR

2. INTRODUCTION TO GRINDING PROCESS
The Grinding process is used to produce a high surface finish with a close tolerance and for machining hard materials.
The process is a variation of polishing and uses abrasive materials held together by an adhesive in the form of a solid wheel.
INTRODUCTION TO GRINDING PROCESS

3. Purposes for GRINDING Removal of surplus material
Production of high surface finishes
Machining very hard materials
Purposes for GRINDING

4. A grinding wheel consists of abrasive particles and bonding material
A grinding wheel consists of abrasive particles and bonding material. The bonding material holds the particles in place and establishes the shape and structure of the wheel.
The wheel is generally made from a matrix of coarse particles pressed and bonded together to form a solid circular shape,various profiles and cross sections are available depending on the uses for the wheels.
GRINDING WHEELS

5. GRINDING WHEELS
GRINDING WHEEL

6. FUNCTIONS OF A GRINDING WHEEL
To remove materials from a workpiece
Each grains acts as a cutting tool
It is a cheap formation process
The only self sharpening cutting tool
Considered as a abrasive machining
FUNCTIONS OF A GRINDING WHEEL

7. Abrasives are the intended for actual cutting action hence they are the hard substances.
Abrasives are classified as
Aluminium Oxides
Ceramic
Silicon carbide
Super Abrasive-DIAMOND
Tungsten Carbide
ABRASIVES

8. It is a material used as GLUE to hold the abrasive grains together
It is a material used as GLUE to hold the abrasive grains together.Bond has no cutting action.The bonding materials commonly used are
Metal
Resin
Rubber
silicate
Bond

9. TYPES OF GRINDING WHEEL

10. Grinding wheel wear is an important consideration because it adversly affects the shape and accuracy of ground surfaces as in the case with cutting tools.
GRINDING WHEEL WEAR

11. Attritious Wear
Grain Fracture
Bond Fracture
TYPES OF WEAR

12. ATTRITIOUS WEAR The cutting edges of a sharp grain become dull.
Wear are caused by the interaction of the grain with the workpiece involving both physical and chemical reactions.
These reactions involve diffusion,chemical degradation or decomposition of the grain.
ATTRITIOUS WEAR

13. Attritious wear is low when the two materials are chemically inert with respect to each other.
The more the inert the materials,the lower will be the tendency of reaction.
This wear based on the reactivity of the grain and the workpiece and their relative mechanical properties such as hardness and toughness.

14. Because abrasive grains are brittle,their fracture in grinding are important.
If the wear is excessive,the grain become dull.
Grinding become inefficient and produces undesirably high temperatures.
New sharp cutting edge are produced continuously during grinding.
GRAIN FRACTURE

15. The strength of bond is a significant parameter in grinding.
If the bond is too strong sharp grain along the circumference of the grinding wheel can begin to the contact of workpiece thus process becomes insufficient.
If the bond is too weak the grain will dislodged easily,wear rate is of wheel is increases then dimensional accuracy becomes difficult.
BOND FRACTURE

16. GRINDING MACHINES AND OPERATIONS
A grinding machine is a machine tool used for producing very fine finishes or making very light cuts using an abrasive wheel as the cutting device.
A distinguishing feature of grinding machines is the rotating abrasive tool.
Grinding machine is employed to obtain high accuracy along with very high class of surface finish on the workpiece.
GRINDING MACHINES AND OPERATIONS

17. CATEGORIES OF GRINDING MACHINE
Surface Grinding
Cylindrical Grinding
Internal Grinding
Centre Grinding
Centerless Grinding
CATEGORIES OF GRINDING MACHINE

18. Surface grinding is an abrasive machining process in which the grinding wheel removes material from the plain flat surfaces of the workpiece.
the spindle position is either horizontal or vertical.
the relative motion of theworkpiece is achieved either by reciprocating the workpiece past the wheel or by rotating it.
SURFACE GRINDING

20. In this operation, the external or internal cylindrical surface of a workpiece are ground. In external cylindrical grinding (also center-type grinding) the workpiece rotates and reciprocates along its axis although for large and long workparts the grinding wheel reciprocates.
In internal cylindrical grinding, a small wheel grinds the inside diameter of the part. The workpiece is held in a rotating chuck in the headstock and the wheel rotates at very high rotational speed. In this operation, the workpiece rotates and the grinding wheel reciprocates.
CYLINDRICAL GRINDING

22. Centerless grinding is a process for continuously grinding cylindrical surfaces in which the workpiece is supported not by centers or chucks but by a rest blade. The workpiece is ground between two wheels. The larger grinding wheel does grinding, while the smaller regulating wheel, which is tilted at an angle regulates the velocity of the axial movement of the workpiece.
CENTRELESS GRINDING

24. THANKS