Presentation on

GRINDING MACHINE

MANUFACTURING PROCESS - 1(2131903)

Prepared by : NIREN PANCHAL (130240119542)

HASMUKH GOSWAMI COLLEGE OF ENGINEERING

GRINDING (Abrasive machining)

Grinding is a surface finishing operation where very thin layer of material

is removed in the form of fine dust particles. (thickness 0.25-0.5mm)

Grinding can be defined as a material removal process by the abrasive

action between rotating abrasive wheel & the work piece.

Grinding machine is a power operated machine tool where, the work

piece is fed against a constantly rotating abrasive wheel which is also

called as Grinding wheel so that a thin layer of material is removed from

the work piece.

PRINCIPLE OF GRINDING

The work piece is fed against a constantly

rotating abrasive wheel so that a thin layer

of material is removed from the it.

FIG. GRINDING

INTRODUCTION TO GRINDING PROCESS

• It is the only economical method of cutting hard material like hardened steel.

• It produces very smooth surface , suitable for bearing surface.

• Surface pressure is minimum in grinding. It is suitable for light work,which

will spring away from the cutting tool in the other machining processes.

GRINDING PROCESS

CLASSIFICATION OF GRINDING MACHINES

Grinding machines are classified based on their

construction & type of surface produced.

1. Bench Grinding Machine

2. Surface Grinding Machine

3. Cylindrical Grinding Machine

4. Centerless Grinding Machine

5. Internal Grinding Machine

6. Special Purpose Grinding Machine

1. SURFACE GRINDING MACHINE

FIG. PRINCIPLE OF SURFACE GRINDING

Principle: The work piece is fed

against a constantly rotating abrasive

wheel so that a thin layer of material

is removed from the it.

Work Piece Type: Flat, Angular &

Irregular surfaces

SURFACE GRINDING MACHINE

This machine may be similar to a milling machine used mainly to grind flat surface. However, some

types of surface grinders are also capable of producing contour surface with formed grinding wheel.

Basically there are four different types of surface grinding machines characterised by the movement

of their tables and the orientation of grinding wheel spindles as follows:

• Horizontal spindle and reciprocating table

• Vertical spindle and reciprocating table

• Horizontal spindle and rotary table

• Vertical spindle and rotary table

Horizontal spindle and reciprocating table

c

Vertical spindle and reciprocating table

Horizontal spindle and rotary table

Vertical spindle and rotary table

FIG. SURFACE GRINDING MACHINE

Surface Grinding machine

CYLINDRICAL GRINDING MACHINE

FIG. PRINCIPLE OF CYLINDRICAL GRINDING

Principle:

The work piece is held between two

centers & and the rotating grinding

wheel is fed against it.

External Grinding machine

Work Piece Type: Cylindrical surfaces

may be straight, curved or contoured.

CYLINDRICAL GRINDING MACHINE

This machine is used to produce external cylindrical surface. The surfaces may

be straight, tapered, steps or profiled. Broadly there are three different types of

cylindrical grinding machine as follows:

1. Plain centre type cylindrical grinder

2. Universal cylindrical surface grinder

3. Centreless cylindrical surface grinder

Plain centre type cylindrical grinder

Universal cylindrical surface grinder

Universal cylindrical grinder is similar to a plain cylindrical one except that it

is more versatile. In addition to small worktable swivel, this machine provides

large swivel of head stock, wheel head slide and wheel head mount on the

wheel head slide.

Special application of cylindrical grinder

Principle of cylindrical grinding is being used for thread grinding with

specially formed wheel that matches the thread profile. A single ribbed wheel

or a multi ribbed wheel can be used as shown in Fig. below.

FIG. CYLINDRICAL GRINDING MACHINE

Cylindrical Grinding Machine

CENTERLESS GRINDING MACHINE

FIG. PRINCIPLE OF CENTERLESS GRINDING

Principle: The work piece is placed on work rest

blade between two wheels namely grinding &

regulating wheel, which are rotating in clockwise &

work piece rotates counter clockwise. Grinding

wheel remove material from W/P surface &

regulating wheel regulates the W/P.

Centerless: Means work piece is not held between

centers.

Work Piece Type: Curved or Cylindrical surfaces

of long slender rods which cannot be ground on

cylindrical grinding.

Centre less Grinding

Centre less Grinding machine

External centreless grinder

This grinding machine is a production machine in which out side diameter of the workpiece is ground. The workpiece is not held between centres but by a work support blade. It is rotated by means of a regulating wheel and ground by the grinding wheel.

Internal grinding machine

This machine is used to produce internal cylindrical surface. The surface may be straight, tapered, grooved or profiled.

Broadly there are three different types of internal grinding machine as follows:

1. Chucking type internal grinder

2. Planetary internal grinder

3. Centreless internal grinder

Chucking type internal grinder

The workpiece is usually mounted in a chuck. A magnetic face plate can also be used. A small grinding wheel performs the necessary grinding with its peripheral surface. Both transverse and plunge grinding can be carried out in this machine.

Planetary internal grinder

Planetary internal grinder is used where the workpiece is of irregular shape and can not be rotated conveniently as shown in Fig. below. In this machine the workpiece does not rotate. Instead, the grinding wheel orbits the axis of the hole in the workpiece.

Centreless internal grinder

This machine is used for grinding cylindrical and tapered holes in cylindrical parts (e.g. cylindrical liners, various bushings etc). The workpiece is rotated between supporting roll, pressure roll and regulating wheel and is ground by the grinding wheel.

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