2 During a lathe turn machining process the temperature of t

2. During a lathe turn machining process, the temperature of the chips gets hot. Please list two main reasons contributing the temperature increase in the chip.2 How will the rake angle affect the temperature change in the chip?3 How will the shear angle affect the temperature change in the chip? (20 points)

Solution

1) The two main reasons for temperature raise are:

a)friction between the surface of tool and the workpeice.

b) the conversion of plastic deformation into heat in the primary and secondary zones.

2) Increase in Rake angle increases coefficient of friction in between the surfaces,which accounts for increase in the temperature.

3) shear angle decides the the thickness of chip ,higher the shear angle higher is the chip thickness and higher the cutting forces,therfore temperature raises with increase in shear angle.