Introduction to Theory of Metal cutting

In all industrial manufacturing Processes for  cutting  of metal tool plays important role. In this course , students can understand the basic concept of tool engineering,along with this he or she can understand  the  metal cutting principle ,types of metal cutting processes, classification and their difference of metal cutting tool.During Metal cutting their is formation of chip,so different types of  tool material to be selected for different types of cutting.

-The purpose of cutting tool material is to remove metal under controlled conditions. Thus the tool material should be harder than the material which is to be cut .

Following tool materials are used to manufacture of cutting tools

Carbon tool steel

High speed steel

Cemented carbides

Ceramics

Diamonds

Cubic Boron Nitride(CBN)

Polycrystalline Cubic Boron Nitride(PCBN)

-The cutting tool material should possesses following requirements :

It should be strong enough to withstand the forces being applied due to cutting

It should be tough (resistant to shock)

It should be harder than material

It should be able to resist high temperature

It should be capable of withstand the sudden cooling effect

The coefficient of friction between the chip and tool should be low as possible

It should be easily formed to the required cutting shape

classification of tool:

Depending upon the number of edges there are two types

-Single point cutting tool-it has only one effective cutting edge and remove the excess material from work piece

Ex. Turning tools, Shaping tolos,Slotting tools, Boring tools

-Multipoint cutting tool-They have more than one effective cutting edge and remove the excess material from work piece

Ex. milling cutters, broaching cutters,Hobs,gear shaping cutters