The secondary shear zone during metal machining lies between:
| The secondary shear zone during metal machining lies between:
A. metal chip and cutting tool
B. cutting tool and metal workpiece
C. metal workpiece and metal chip
D. cutting tool and metal dust
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
Concept:
Secondary Shear Zone (SSZ):
- It lies between the metal chip and cutting tool.
- In SSZ the energy supplied is converted into heat energy because of the presence of friction at the chip tool interface.
- About 30 to 35% of the energy supplied is converted into heat energy in the SSZ.
- Out of the heat generated the maximum amount of the heat is carried away by the chip, Only a small amount is transferred to the tool.
- This is because the thermal conductivity of the tool is less than the chip.
Primary Shear Zone (PSZ):
- It lies between the workpiece and metal chip.
- In the PSZ when shearing action os taking place, the atomic bond present between the atoms of the material is getting breaking.
- For breaking the atomic bond it needs to supply a certain amount of energy but during the breaking of the atomic bond, they release an equal amount of energy in the form of heat energy.
- Out of the heat generated the maximum (60 to 65%) amount of the heat is carried away by the chip.
Tertiary Shear Zone(TSZ):
- It lies between workpiece and cutting tool.
- In TSZ, the energy supplied is converted into heat energy is due to the presence of friction of the tool work interface.
- About 5 to 10% of the energy supplied is converted into heat energy in this zone.
