Introduction about Grinding Processes Principle of Grinding machine Cutting action of grinding wheel Types of grinding various elements of grinding wheel

1. Mr. Ketan K. Devadhara
Mechanical Engineering
DepartmentIn 2005,A Vallabh Budhi Polytechnic has been started in the field of Engineering &
Technology as per guidelines of (AICTE) All India Council for Technical Education, New
Delhi and Gujarat Technological University,Ahmedabad.
VALLABH BUDHI POLYTECHNIC, NAVSARI-655
Facebook.com/vbp655
CIVIL
Engineering
COMPUTER
Engineering
ELECTRICA
LEngineering
MECHANIC
ALEngineering
9409749547 dec655owner@gtu.edu.in
NPPE Campus, Bhanunagar, Eru-Aat Road ,Ta. Jalalpore, Di. Navsari.Pin:396445, Gujarat, India
I/c Head of Department

2. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

3. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
 Introduction
 Principle of grinding machines
 Cutting action of grinding wheel
 Types of Grinding
 Various elements of a Grinding Wheel

4. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

5.  Work piece is fed against the rotating abrasive wheel.
 Due to action of rubbing or friction between the abrasive particles and work piece material is
removed.
V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

6. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
 SHEARING ACTION
 PLASTIC DEFORMATION
 FRACTURE

7. On the basis of quality of grinding, it is classified as rough grinding and
precision grinding.
 Rough Grinding
 Precision Grinding
 Rough Grinding:- It involves removal of stock without any reference
to the accuracy of results.
 Precision Grinding:- Precision grinding removes negligible amount
of metal. It is used to produce finished parts and accurate
dimensions.
V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

8. Grinding wheel is made up with two main elements:
 Abrasive particles
 Bonding material
 Abrasive particles :
 Properties of abrasive materials:
i. Penetration hardness.
ii.Resistance against elastic deformation.
iii.Resistance against fracture.
iv.Resistance to wear.
 Abrasives are classified into two principal groups
 Natural abrasive
 Artificial abrasive
V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

9.  Natural abrasive:- There are a few examples of natural abrasives which
include sand stone (solid quartz), emery, diamond etc.
 Artificial abrasive:- Main artificial abrasive are silicon carbide (Sic),
aluminum oxide (Al2O3), Boron Nitride (BNO3), cubic Boron Nitride (CBN)and
diamond etc. Artificial abrasive are preferred in manufacturing of grinding
wheels because of their uniformity and purity.
 Bonding material :
 Function:
 To hold the abrasive
 Helps in self sharpening action
 To provide mechanical strength to wheel
V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

10.  Types of bonding material
(a) Vitrified bond (V) Clay + abrasive + water
(b) Silicate bond (S) Abrasive + silicate + soda or water
(c) Oxychloride bond (O)
(d) Resinoid bond (B) Roughing, grooving,
(e) Shellac bond (E) cutting off, polishing
(f) Rubber bond (R)
Organic Bond
V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

11. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT