JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

UNIT - I

Mechanics of Metal Cutting: Geometry of Metal Cutting Process, Chip formation, Chip thickness ratio, radius of chip curvature, cutting speed, feed and depth of cut – Types of chips chip breakers. Orthogonal and Oblique cutting processes – definition, Forces and energy calculations (Merchant’s Analysis) – Power consumed – MRR- Effect of Cutting variables on Forces, Force measurement using Dynamometers.

UNIT - II

Single Point Cutting Tool: Various systems of specifications, single point cutting tool geometry and their inter-relation. Theories of formation of built-up edge and their effect, design of single point contact tools throwaway inserts.

UNIT - III

Multipoint Cutting Tool: Drill geometry, design of drills, Rake & Relief angles of twist drill, speed, feed and depth of cut, machining time, forces, milling cutters, cutting speed &feed machining time- design – from cutters. Grinding: Specifications of grinding of grinding wheel, mechanics of grinding, Effect of Grinding conditions on wheel wear and grinding ratio. Depth of cut, speed, machining time, temperature power.

UNIT - IV

Tool Life and Tool Wear: Theories of tool wear – adhesion, abrasive and diffusion wear mechanisms, forms of wear, Tool life criteria and machinability index. Types of sliding contact, real area of contact, laws of friction and nature of frictional force in metal cutting. Effect Tool angle, Economics, cost analysis, mean co-effect of friction.

UNIT - V

Cutting Temperature: Sources of heat in metal cutting, influence of metal conditions, Temperature distribution, zones, experimental techniques, analytical approach. Use of tool- work thermocouple for determination of temperature. Temperature distribution in Metal Cutting. Cutting fluids: Functions of cutting fluids, types of cutting fluids, properties, selection of cutting fluids. Cutting tool materials: Historical developments, essential properties of cutting tool materials, types, composition and application of various cutting tool materials, selection of cutting tool materials.

REFERENCES:

• 1. Metal Cutting Principles/ MC Shaw / Oxford and IBH Publications, New Delhi, 1969
• 2. Fundamentals of Machining /Boothryd/ Edward Amold publishers Ltd 1975
• 3. ‘ Tool Design’ by David Son / Lacain/ Goud, Tata Me Graw Hill
• 4. Fundamentals of Tool Design by Wilson fw , ASTME PHI 2010.
• 5. Technology of machine tools, Steve F. Krar, Arthur R. Gill and Peter Smid, Mcgraw Hill Education (India) Pt. Ltd., 2013.