JNTUA B.Tech. R20 Regulations

########## JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY ANANTAPUR B.Tech (ME) - III-I Sem L T P C 3 0 0 3 (20A03504b) TOOL DESIGN

##### (PROFESSIONAL ELECTIVE-I)

########## Course Objectives:

The objectives of this course are to

- • Describe the basic concepts of Tool Design.
- • Classify Fits and Tolerances used in Tool Design.
- • Define the fundamental concepts of Designing of Jigs and Fixtures.
- • Apply basic mathematics to design the press tool dies.
- • Understand the nomenclature of the milling cutters.
- • Explain the conceptual design of CNC machine tools.

########## Course Outcomes:

At the end of the course student will be able to

- • Compare the Ferrous and non ferrous tool materials
- • Classify the types of chip formation during orthogonal cutting
- • Design Drill Jigs and Fixtures
- • Design a simple gripper for robot
- • Understand the concept of design of die and piercing operations
- • Understand about the tool holding methods, Automatic tool changers and tool positions in CNC Machine

########## UNIT I INTRODUCTION TO TOOL DESIGN

Introduction - Tool Engineering - Tool Classifications - Tool Design Objectives - Tool Design in manufacturing- Challenges and requirements- Standards in tool design-Tool drawings -Surface finish - Fits and Tolerances - Tooling Materials- Ferrous and Non ferrous Tooling Materials- Carbides, Ceramics and Diamond -Non metallic tool materials-Designing with relation to heat treatment.

########## UNIT II DESIGN OF CUTTING TOOLS

Mechanics of Metal cutting - Oblique and orthogonal cutting- Chip formation and shear angle - Single- point cutting tools - Milling cutters - Hole making cutting tools- Broaching Tools - Design of Form relieved and profile relieved cutters-Design of gear and thread milling cutters.

########## UNIT III DESIGN OF JIGS AND FIXTURES

Introduction - Fixed Gages - Gage Tolerances - selection of material for Gauges - Indicating Gages - Automatic gages - Principles of location - Locating methods and devices - Principles of clamping - Drill jigs - General considerations in the design of drill jigs - Drill bushings - Methods of construction - Types of Fixtures - Vice Fixtures - Milling Fixtures - Boring Fixtures - Broaching Fixtures.

########## UNIT IV DESIGN OF PRESS TOOL DIES

Types of Dies - Method of Die operation - Clearance and cutting force calculations- Blanking and Piercing die design - Pilots - Strippers and pressure pads- Presswork materials - Centre of pressure - Strip layout - Short-run tooling for Piercing - Bending dies - Drawing dies-Design and drafting.

########## UNIT V TOOL DESIGN FOR CNC MACHINE TOOLS

Introduction - Tooling requirements for Numerical control systems - Fixture design for CNC machine tools- Sub plate and tombstone fixtures-Universal fixtures - Cutting tools - Tool holding methods - Automatic tool changers and tool positioners - Tool presetting - General explanation of the Brown and Sharp machine.

##### Textbooks:

- 1. Cyrll Donaldson, George H.LeCain, V.C. Goold, 'Tool Design', Tata McGraw Hill Publishing Company Ltd., 2000.
- 2. E.G.Hoffman,' Jig and Fixture Design', Thomson Asia Pvt Ltd, Singapore, 2004.

########## Reference Books:

- 1. P.C.Sharma, A Text book of Production Engineering, S.Chand Publications, 1999.
- 2. Prakash Hiralal Joshi, 'Tooling data', Wheeler Publishing, 2000
- 3. Venkataraman K., 'Design of Jigs, Fixtures and Presstools', TMH, 2005.