Machine Tool Design MEHTA

Machine Tool Design 3rd Edition
N.K.MEHTA
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Contents
About the Author ii
Preface xi
1 * INTRODUCTION TO MACHINE TOOL DRIVES AND MECHANISMS— 1
GENERAL PRINCIPLES OF MACHINE TOOL DESIGN
Ll Working and Auxiliary Morions in Machine Tools J
1.2 Palamctcrs Dcfin ing Worldng Mot ions of a Machine Tool 3
1.3 Machine TootDriy^t 19
1.4 I Wdrmihc Transmission and Its Elements 23
L5 Mechanical Transmission and Its Elements 34
14 Technico-economical Prerequisites for Undertaking die Design of a New Machine Tool 52
L7 General Requirements of Machine Tool Design 54
LS Engineering Design Process Applied to Machine Tools 57
L9 Layout of Machine Tool 60
Review Questions 65
References 67
2. REGULATION OF SPEED AND FEED RATES 68
2.1 Aim of Speed and Feed Rate Regulation 68
22 Stepped Regulation of Speed: Design of Speed Box 69
23 Design of Feed Box 90
2.4 Machine Tool Drives Using Multiple-speed Motors 95
2.5 Special Cases of Gear Box Design 95
2.6 Genera I Recommenda[tionsfor Deve Iopi ng t he Gearing I )iagram i 05
2.7 I >etermining the Numher pfl'eeth of Gears ! OS
2.8 Classification of Speed and Feed Boxes 118
2.9 Stepless Regulation of Speed and Feed Rates 124
24 0 Kinematics of Machine Tools 140
Review Questions 163
References 166
3* DESIGN OF MACHINE TOOL STRUCTURES 167
3.1 Functions of Machine Tool Structures and their Requirements 167
3.2 Design Criteria for Machine Tool Structures 167vlii Contents
3.3 Materials of Machine Tbol Structures /70
3.4 Staticand Dynamtc tr Srififtiess /75
3.5 Profiles of Machine Tool Structures /52
3.6 Basic Design Procedure of Machine Tool Structures 188
3.7 Design of Beds ! 97
3.8 Design of Columns 2/3
3.9 Design ot' Housings 216
3;10 Design ofBases and Tables 219
3.11 Design of Cross Rails, Anns, Saddles and Carriages 22!
3.12 Design of Rams 222
3.13 Model Teetmique in Design of Macbine Too1 STRUCTLIRES 224
Review Questions 228
References 221
4, DESIGN OP GUI DP:WAVS AM) POWER SCREWS
4. i Functions and Types of Guideways 233
4.2 Design of Slideways 234
4.3 I>esign Criteria and Calculations for SIideways 243
4.4 Guideways Operating under l iquid Friction Conditions
4.5 Design of Aerostatic Slideways 265
4.6 I3esign of Anti-friefion Guideways 267
4.7 Combination Guideways 273
4.8 Protecting Devices for Slideways 274
4.9 Design of Power Serews 276
Questions 285
References
5, DESIGN OF SPINDLES AND SPINDLE SUPPORTS
5.1 Functions of Spindle Unit and Requirements 288
5.2 Materia Es of Spindles 289
5.3 Effect of Machine Tool Compliance on Machining Accuracy 290
5.4 Design Calculations of Spindles 294
5.5 Anti-friction Ehearings 303
5.6 Sliding Bearings 310
Review Questions 332
References
28«Contents in
6. DYNAMICS OF M ACHINE TOOLS
6.1 Machine Tool Elastic System-cutting Process Closed-lcK>gfSystem 335
6.2 General Procedure for Assessing Dynamic Stability
of Ees— Gutting Process Closed-Loop System 336
6.2 Dynamic Charactenstics of Elements and SysLems 339
6.4 Dynamic Characteristic of the Equivalent Elastic System 340
6.3 Dynamic Characteristic of the Cutting Process 352
6.6 Stability Analysis 366
6.7 Forced Vibration^ of Machine Tools 378
Review Questions 383
References 385
7\ CONTROL SYSTEMS IN MACHINE TOOLS
7 . t Functions, Requirements and Classification 386
7.2 Control Systems for Changing Speeds and Feeds 386
1.2 Control Systems for Executing Forming and Auxiliary Motions 396
7 ,4 Manual Control Systems 397
IS Automatic Control Systems 410
7.6 Adaptive Control Systems 415
References
8. NUMERICAL CONTROL OF MACHINE TOOLS 419
8.1 Fundamental Concepts, Classification and Structure of Numerical Control Systems 419
8.2 Manual Port Programming 440
8.3 Computer Aided Fart Programming 465
Review Questions 486
Referenceit 493
9, EXTENSIONS OF NUMERICALCONTROL— CNQ DIS C, 494
MACHINING CENTRES
9.1 Distributive Numerical Control (DNC-1J 495
9.2 Computer Numerical Control (CNC) 495
9.3 Machining Centres 498
9.4 Direct Numerical Control (DNC-3) 501
9.5 CNC Programming 504
Review Questionns 538
Index 543
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