Question

What is thermal aspects of machining? discusss briefly a technique for measuring average chip tool interface temperature?

Answer 1

Instructional Objectives At the end of this lesson, the students would be able to (i) Identify the causes of development of heat and temperature in machining (ii) State the effects of cutting temperature on cutting tool and job (iii) Determine the value of cutting temperature • Analytical methods • Experimental methods (iv) Evaluate the roles of variation of the different machining parameters on cutting temperature. (v) Point out the general methods of controlling cutting temperature. (i) Sources and causes of heat generation and development of temperature in machining During machining heat is generated at the cutting point from three sources, as indicated in Fig. 2.7.1. Those sources and causes of development of cutting temperature are: • Primary shear zone (1) where the major part of the energy is converted into heat • Secondary deformation zone (2) at the chip – tool interface where further heat is generated due to rubbing and / or shear • At the worn out flanks (3) due to rubbing between the tool and the finished surfaces.