BUILT UP EDGE:
It is formed during the cutting process, continuous chip formation of metal, and cause welding up of metal chip to the cutting edge.
This welded metal on the work piece is known as built up edge, by this formation the cutting tip changes to cutting edge.
Points for formation of built up edge:
1. Speed of cutting.
2. Tool rake angle.
3. Coarse feed.
4. In sufficient of cutting fluid.
4. Condition of cutting edge.
Causes:
* This is due to high friction also.
* It is formed by tool edge bluntness.
* This also depends on the type of metal in machining process.
* At higher cutting speed built up edge increases .
* The shape of built up edge is a function of cutting speed and temperature
