JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course Overview: At the very outset of engineering development materials were cut by means of simple hand tools. Gradually, with the development of civilization and engineering, work done by hand tools gives way to the work performed by special machines which are called machine tools.

Hand tools are tools which are held and used by the hands for shaping and sizing a work and there is no mechanism in them. The cutting away of the excess metal in the form of chips or small pieces is simply done by the muscular efforts of man. As a result, the process is time consuming and not gives satisfactory surface finish. It includes files, saw, chisel, scrapper, etc. which are very commonly used in bench and fitting works and assembly of machines.

Course Objectives:

• 1. Machine tools is one of the important subject in mechanical engineering faculty, not only in educational institutional, but it has very much of importance in industrial domain. Without a machine tool, there is no industry.
• 2. A source of power is always needed in various workshop processes particularly in cutting and forming of metal in a machine tool. In the metal-working industry work pieces of most different shapes and dimensions and of different materials are worked. In every industry we need shaping of materials.
• 3. This shaping of materials is done by either non-cutting process or cutting process. For example forging, pressing, drawing, etc are non- cutting shaping processes. Turning, drilling, mailing etc are comes under cutting shaping operations.
• 4. The process of metal cutting in which chip is formed is affected by relative motion between the work piece and the hard edge of a cutting tool held against the work piece. Such relative motion is produced by combination of rotary and translating movements either of work piece or the cutting tool or of both.
• 5. Machining process also include other processes like grinding, slotting, shaping, honing, planning, lapping, and broaching operations.
• 6. After completion of the machine tools course, students can be able to identify various applications of different tools, can be able to differentiate various tools for different machining operations, and also they can be able to solve many industrial problems regarding machine tools. And also as the kinematics of machines studied, students can be able to design various machine tools for various machines.

Course Outcomes:

• 1. An ability to understand the basic parameters in the metal cutting operation, to Calculate analytically the forces and other parameter associated with orthogonal cutting
• 2. An Ability To Know the various cutting fluids and their application methods, to R16 B.TECH MSNT. understand the importance of lathe, its many varieties and basic structure of center lathe
• 3. An ability to Understands operation of shaper, slotter , planer and drilling machine, the characteristics feature of the milling and drilling machine
• 4. An ability To Know the various types of milling machine ,grinding machine, boring machine s and their application and their operations, need for jigs and fixtures and Design jigs for practical application
• 5. An ability to Know the various types of milling machine ,grinding machine, boring machines and their applications and their operations

UNIT - I

Elementary treatment of metal cutting theory – Element of cutting process – Geometry of single point tool and angles chip formation and types of chips – built up edge and its effects, chip breakers. Mechanics of orthogonal cutting –Merchant’s Force diagram, cutting forces – cutting speeds, feed, depth of cut, tool life, coolants, machinability – Tool materials.

UNIT - II

Engine lathe – Principle of working, specification of lathe – types of lathe – work and tool holding devices, Taper turning, Thread turning – Lathe attachments. Turret and capstan lathe – Principal features of automatic lathes – classification: Single spindle and multi-spindle automatic lathes – tool layouts.

UNIT - III

Shaping, slotting and planing machines – Principles of working – Principal parts – specification, classification, operations performed. Kinematic scheme of the shaping, slotting and planing machines, machining time calculations. Drilling and Boring Machines – Principles of working, specifications, types, operations performed – tool holding devices – twist drill – Boring machines – Fine boring machines – Jig boring machine. Deep hole drilling machine. Kinematics scheme of the drilling and boring machines

UNIT - IV

Milling machine – Principles of working – specifications – classifications of milling machines – Principal features of horizontal, vertical and universal milling machines – machining operations Geometry of milling cutters – methods of indexing – Accessories to milling machines, kinematic scheme of milling machines. Lapping, honing and broaching machines – comparison of grinding, lapping and honing. Kinematics scheme of Lapping, Honing and Broaching machines. Constructional features speed and feed Units, machining time calculations

UNIT - V

Finishing Processes: Grinding – fundamentals – theory of grinding – classification of grinding machines – cylindrical and surface grinding machine-Tool and cutter grinding machine – special types of grinding machines, Different types of abrasives – bonds

R16 B.TECH MSNT.

specification of a grinding wheel and selection of a grinding wheel, Kinematic. scheme of grinding machines.

TEXT BOOKS:

• 1. Production Technology/HMT/Tata McGraw Hill
• 2. Production Technology / R.K. Jain and S.C. Gupta/Khanna Publishers.

REFERENCE BOOKS:

• 1. Principles of Machine Tools/ Bhattacharya A and Sen.G.C/ New Central Book Agency.
• 2. Workshop Technology – Vol.-II/ B.S. Raghuvamsi
• 3. Elements of Work Shop Technology – Vol. II/Hajra Choudry/ Media Promoters.
• 4. Fundamentals of Metal Machining and Machine Tools/ Geofrey Boothroyd/ McGraw Hill
• 5. Manufacturing Processes/JP Kaushish/Prentice Hall/2nd Edition
• 6. Machine Tools/C Elanchezhian & M. Vijayan/Anuradha Publications R16 B.TECH MSNT.