Mechanical Engineering - Production Engineering - Discussion

C is the correct answer. No doubt.

Favorable conditions are:

1. High friction at tool face
2. Low rake angle
3. Ineffective cutting fluid
4. Low speed
5. High feed rate
6. High depth of cut
So option B is correct.

B is right.

For low rake angle force required is high power high temperature high so built up edge generate.

Low-speed tool workpiece contacts high temperature high.

Is Continuous and discontinuous a similar factor?

The answer should be C.

With the increase in cutting velocity and feed the cutting temperature rises and favours BUE
formation. But if cutting velocity is raised too high beyond a certain limit, BUE will be squashed out by the flowing chip before the BUE grows.

Continuous type

Without BUE :
- work material -> ductile.
- Cutting velocity ->high.
- Feed -> low.
- Rake angle -> positive and large.
- Cutting fluid ->both cooling and lubricating.

With BUE :
- work material ->ductile.
- cutting velocity ->medium.
- feed -> medium or large.
- cutting fluid ->inadequate or absent.

Low cutting speed causes long chip tool contact time.

Due to high friction and temperature local welding occurs between tool and chip which leads to built up edge formation.