FUNDAMENTALS OF CUTTING

M.PALANIVENDHANASSISTANT PROFESSOR

DEPARTMENT OF AUTOMOBILE ENGINEERING

SRM UNIVERSITY

What Do We Use To Cut A Apple ?

Which Tool?

ScaleKnife

Knife is Harder

Knife is Sharper

It is used to cut, with ease i.e Approach Angle

What Do We Use To Cut Steel or Cast Iron or Stainless Steel?

Tungsten Carbide – Since it’s harder than most of the materials. Diamond is hardest than all other materials.

What is Common in this Process?

Turning

Milling

Drilling

Grinding

These

Operations

have

material

being

removed

What is Common in this Process?

What is required for machining?

Depth of Cut - Preset interference between tool and work piece

Feed - Motion to bring in additional material for machining

Speed - What generates the basic wedge and cuts

Machine Classifications

Turning Center or Lathe

Vertical Machining Centre (VMC)

Horizontal Machining Centre (HMC)

Special Purpose Machines (SPM)

Zones of Heat Generation

Shear ZoneChip Tool Interface

Tool WorkInterface

Work

Heat Dissipation

Work

80% Energy is converted to heat

18% of Energyis converted to heat

2% of energyconverted to heat

TOOL WEAR

Gradual Tool Wear – Unavoidable but controllable

Premature Wear or failure – Avoidable

How Do We Rate Machinability?

Tool life in minutes

Cutting forces and Power consumed

Quality of Surface Finish

Chip formation

Material removal rate