Mechanical Engineering - Production Engineering - Discussion

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.

Answer is surely C, rake angle should be positive or high and cutting velocity should be high for producing continuous chip with built up edges.

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.

The answer should be C.

Is Continuous and discontinuous a similar factor?

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.

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.

C is the correct answer. No doubt.

The answer should be 'D'.

If the cutting speed is less then obviously temperature is low and heat produced is less. Because of less heat generation there is no built up edge.