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E-raamat: Fundamentals of Machining Processes: Conventional and Nonconventional Processes, Third Edition

(Egypt-Japan University of Science and Technology)
  • Formaat: 602 pages
  • Ilmumisaeg: 31-Oct-2018
  • Kirjastus: CRC Press
  • ISBN-13: 9780429811739
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  • Formaat: 602 pages
  • Ilmumisaeg: 31-Oct-2018
  • Kirjastus: CRC Press
  • ISBN-13: 9780429811739

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Written by an expert with over 40 years of experience in research and teaching machining and related topics, this new edition textbook presents the principles and theories of material removal and applications for conventional, nonconventional and hybrid machining processes. The new edition is ideal for undergraduate students in production, materials, industrial, mechatronics, marine, mechanical, and manufacturing engineering programs, and also useful for graduate programs related to higher-level machining topics, as well as professional engineers and technicians. All chapters are updated, with additional chapters covering new topics of composite machining, vibration assisted machining and mass finishing operations.

Features











Presents a wide spectrum of metal cutting, abrasive machining, nonconventional and hybrid machining processes Analyzes the chip formation in machining by cutting and abrasion processes as well as the material removal mechanisms in the nonconventional and the hybrid processes Explains the role of each process variables on its behavior and technological characteristics in terms of material removal, product accuracy and surface quality Portrays the theoretical and empirical formula for removal rates and surface finish in different processes as well as very useful technical data that help in solving and analysis of day-to-day shop floor problems that face manufacturing engineers Clarifies the machinability concept and introduces the general guidelines for machining process selection
Preface xix
Foreword xxiii
Acknowledgments xxv
Abbreviations xxvii
List of Symbols xxxi
Greek Symbols xl
Author xlv
Chapter 1 Machining Processes 1(16)
1.1 Introduction
1(1)
1.2 Historical Background
2(1)
1.3 Classification of Machining Processes
3(10)
1.3.1 Machining by Cutting
4(2)
1.3.1.1 Form Cutting
4(1)
1.3.1.2 Generation Cutting
5(1)
1.3.1.3 Form and Generation Cutting
5(1)
1.3.2 Machining by Abrasion
6(3)
1.3.3 Machining by Erosion
9(1)
1.3.3.1 Chemical and Electrochemical Erosion
10(1)
1.3.3.2 Thermal Erosion
10(1)
1.3.4 Hybrid Machining
10(1)
1.3.5 Micromachining
11(1)
1.3.6 Assisted Machining Processes
12(1)
1.4 Machining Hard-to-Cut Materials
13(1)
1.5 Variables of Machining Processes
13(1)
1.6 Machining Process Selection
14(1)
1.7 Review Questions
15(2)
Chapter 2 Cutting Tools 17(36)
2.1 Introduction
17(3)
2.2 Geometry of Single-Point Tools
20(9)
2.2.1 American Standard Association (Tool-in-Hand) (Coordinate) System
21(1)
2.2.2 Tool Angles in Orthogonal System of Planes
21(4)
2.2.3 Relationship between the ASA and Orthogonal Systems
25(1)
2.2.4 Effect of Tool Setting
26(1)
2.2.5 Effect of Tool Feed Motion
27(1)
2.2.6 Solved Example
28(1)
2.3 Geometry of Multipoint Cutting Tools
29(6)
2.3.1 Twist Drills
29(2)
2.3.2 Reamers
31(1)
2.3.3 Broach Tools
32(1)
2.3.4 End Mills
33(1)
2.3.5 Plain Milling Cutters
34(1)
2.4 Tool Materials
35(14)
2.4.1 Requirements of Tool Materials
35(1)
2.4.2 Classification of Tool Materials
36(17)
2.4.2.1 Ferrous Tool Materials
36(4)
2.4.2.2 Nonferrous Tool Materials
40(6)
2.4.2.3 Nanocoated Tools
46(3)
2.5 Problems
49(1)
2.6 Review Questions
50(3)
Chapter 3 Mechanics of Orthogonal Cutting 53(36)
3.1 Introduction
53(1)
3.2 Chip Formation
53(4)
3.2.1 Discontinuous Chip
53(2)
3.2.2 Continuous Chip
55(2)
3.2.3 Continuous Chip with a Built-up Edge
57(1)
3.3 Orthogonal Cutting
57(13)
3.3.1 Force Diagram
59(2)
3.3.2 Shear Angle
61(2)
3.3.3 Shear Stress
63(1)
3.3.4 Velocity Relations
63(1)
3.3.5 Shear Strain
64(1)
3.3.6 Rate of Strain
65(1)
3.3.7 Theory of Ernst and Merchant
65(2)
3.3.8 Theory of Lee and Shaffer
67(1)
3.3.9 Experimental Verification
68(1)
3.3.10 Energy Consideration
68(1)
3.3.11 Solved Example
69(1)
3.4 Heat Generation in Metal Cutting
70(14)
3.4.1 Cutting Tool Temperature
73(1)
3.4.2 Temperature at Shear Plane
74(1)
3.4.3 Factors Affecting the Tool Temperature
75(7)
3.4.3.1 Machining Conditions
76(1)
3.4.3.2 Cutting Tool
76(1)
3.4.3.3 Cutting Fluids
76(5)
3.4.3.4 Minimum Quantity Lubrication
81(1)
3.4.4 Solved Example
82(2)
3.5 Problems
84(3)
3.6 Review Questions
87(2)
Chapter 4 Tool Wear, Tool Life, and Economics of Metal Cutting 89(24)
4.1 Tool Wear
89(5)
4.1.1 Introduction
89(1)
4.1.2 Forms of Tool Wear
89(5)
4.1.2.1 Crater Wear
91(1)
4.1.2.2 Flank Wear
92(2)
4.1.3 Impact of Tool Wear
94(1)
4.2 Tool Life
94(7)
4.2.1 Formulation of Tool-life Equation
95(1)
4.2.2 Criteria for Judging the End of Tool Life
96(1)
4.2.3 Factors Affecting Tool Life
97(3)
4.2.3.1 Cutting Conditions
97(1)
4.2.3.2 Tool Geometry
98(1)
4.2.3.3 Built-Up Edge Formation
98(1)
4.2.3.4 Tool Material
98(1)
4.2.3.5 Workpiece Material
99(1)
4.2.3.6 Rigidity of the Machine Tool
99(1)
4.2.3.7 Coolant
99(1)
4.2.4 Solved Example
100(1)
4.3 Economics of Metal Cutting
101(9)
4.3.1 Cutting Speed for Minimum Cost
101(4)
4.3.2 Cutting Speed for Minimum Time
105(2)
4.3.3 Cutting Speed for Maximum Profit Rate
107(2)
4.3.4 Solved Example
109(1)
4.4 Problems
110(1)
4.5 Review Questions
111(2)
Chapter 5 Cutting Cylindrical Surfaces 113(46)
5.1 Introduction
113(1)
5.2 Turning
113(14)
5.2.1 Cutting Tools
114(1)
5.2.2 Cutting Speed, Feed, and Machining Time
115(1)
5.2.3 Elements of Undeformed Chip
116(1)
5.2.4 Cutting Forces, Power, and Removal Rate
117(2)
5.2.5 Factors Affecting the Turning Forces
119(3)
5.2.5.1 Factors Related to Tool
119(2)
5.2.5.2 Factors Related to Workpiece
121(1)
5.2.5.3 Factors Related to Cutting Conditions
121(1)
5.2.6 Surface Finish
122(2)
5.2.7 Assigning the Cutting Variables
124(1)
5.2.8 Solved Example
124(3)
5.3 Drilling
127(15)
5.3.1 Drill Tool
127(2)
5.3.2 Elements of Undeformed Chip
129(3)
5.3.3 Cutting Forces, Torque, and Power
132(3)
5.3.4 Factors Affecting the Drilling Forces
135(1)
5.3.4.1 Factors Related to the Workpiece
135(1)
5.3.4.2 Factors Related to the Drill Geometry
135(1)
5.3.4.3 Factors Related to Drilling Conditions
136(1)
5.3.5 Drilling Time
136(1)
5.3.6 Dimensional Accuracy
137(2)
5.3.7 Surface Quality
139(1)
5.3.8 Selection of Drilling Conditions
139(1)
5.3.9 Solved Example
139(3)
5.4 Reaming
142(10)
5.4.1 Finish Reamers
144(1)
5.4.2 Elements of Undeformed Chip
145(1)
5.4.3 Forces, Torque, and Power in Reaming
146(1)
5.4.4 Reaming Time
147(1)
5.4.5 Selection of the Reamer Diameter
148(1)
5.4.6 Selection of Reaming Conditions
149(2)
5.4.7 Solved Example
151(1)
5.5 Problems
152(4)
5.5.1 Turning
152(2)
5.5.2 Drilling
154(2)
5.6 Review Questions
156(3)
Chapter 6 Cutting Flat Surfaces 159(52)
6.1 Introduction
159(1)
6.2 Shaping and Planing
159(9)
6.2.1 Shaper and Planer Tools
159(1)
6.2.2 Elements of Undeformed Chip
159(4)
6.2.3 Cutting Forces, Power, and Removal Rate
163(1)
6.2.4 Shaping Time
164(1)
6.2.5 Selection of Cutting Variables
165(1)
6.2.6 Solved Example
165(3)
6.3 Milling
168(22)
6.3.1 Horizontal (Plain) Milling
168(13)
6.3.1.1 Plain-Milling Cutters
172(1)
6.3.1.2 Cutting Speed of Tool and Workpiece Feed
172(1)
6.3.1.3 Elements of Undeformed Chip
173(1)
6.3.1.4 Forces and Power in Milling
174(4)
6.3.1.5 Surface Roughness in Plain Milling
178(1)
6.3.1.6 Milling Time
179(1)
6.3.1.7 Factors Affecting the Cutting Forces
180(1)
6.3.1.8 Solved Example
181(1)
6.3.2 Face Milling
181(8)
6.3.2.1 Face-Milling Cutters
182(1)
6.3.2.2 Elements of Undeformed Chip
183(3)
6.3.2.3 Surface Roughness
186(2)
6.3.2.4 Machining Time
188(1)
6.3.2.5 Solved Example
188(1)
6.3.3 Selection of Milling Conditions
189(1)
6.4 Broaching
190(15)
6.4.1 Broach Tool
194(4)
6.4.2 Chip Formation in Broaching
198(1)
6.4.3 Broaching Force and Power
199(1)
6.4.4 Broaching Time
200(1)
6.4.5 Accuracy and Surface Finish
201(1)
6.4.6 Broach Devsign
202(2)
6.4.7 Solved Example
204(1)
6.5 Problems
205(4)
6.5.1 Shaping
205(1)
6.5.2 Horizontal Milling
206(1)
6.5.3 Vertical Milling
207(1)
6.5.4 Broaching
208(1)
6.6 Review Questions
209(2)
Chapter 7 High-Speed Machining 211(16)
7.1 Introduction
211(1)
7.2 History of HSM
211(1)
7.3 Chip Formation in HSM
212(1)
7.4 Characteristics of HSM
213(4)
7.5 Machining-Related Measurements
217(6)
7.5.1 Force Measurement
217(2)
7.5.1.1 Dynamometers Based on Displacement Measurement
218(1)
7.5.1.2 Dynamometers Based on Strain Measurement
218(1)
7.5.1.3 Piezoelectric (Quartz) Dynamometers
219(1)
7.5.2 Vibration Measurements
219(1)
7.5.3 Temperature Measurements
220(3)
7.5.3.1 Thermocouple Techniques
220(2)
7.5.3.2 Infrared Techniques
222(1)
7.5.4 Tool Wear Measurements
223(1)
7.6 Applications of HSM
223(2)
7.7 Advantages of HSM
225(1)
7.8 Limitations of HSM
226(1)
7.9 Review Questions
226(1)
Chapter 8 Machining by Abrasion 227(46)
8.1 Introduction
227(3)
8.2 Grinding
230(14)
8.2.1 Grinding Wheels
230(10)
8.2.1.1 Abrasive Materials
230(2)
8.2.1.2 Grain Size
232(1)
8.2.1.3 Wheel Bond
232(1)
8.2.1.4 Wheel Grade
233(1)
8.2.1.5 Wheel Structure
233(1)
8.2.1.6 Grinding-Wheel Designation
234(1)
8.2.1.7 Wheel Shapes
235(1)
8.2.1.8 Selection of Grinding Wheels
235(3)
8.2.1.9 Wheel Balancing
238(1)
8.2.1.10 Truing and Dressing
238(2)
8.2.1.11 Temperature in Grinding
240(1)
8.2.2 Wheel Wear
240(2)
8.2.3 Economics of Grinding
242(2)
8.2.4 Surface Roughness
244(1)
8.3 Surface Grinding
244(9)
8.3.1 Elements of Undeformed Chip
244(3)
8.3.2 Grinding Forces, Power, and Removal Rate
247(1)
8.3.3 Factors Affecting the Grinding Forces
248(1)
8.3.4 Grinding Time
248(2)
8.3.5 Solved Example
250(1)
8.3.6 Surface Grinding Operations
251(2)
8.3.6.1 Plain (Periphery) and Face Grinding with Reciprocating Feed
251(1)
8.3.6.2 Surface Grinding with a Rotating Table
252(1)
8.3.6.3 Creep-Feed Grinding
252(1)
8.4 Cylindrical Grinding
253(15)
8.4.1 Elements of Undeformed Chip
253(2)
8.4.2 Forces, Power, and Removal Rate
255(1)
8.4.3 Factors Affecting the Grinding Forces
256(1)
8.4.4 Factors Affecting Surface Roughness
256(2)
8.4.5 Solved Example
258(2)
8.4.6 Cylindrical Grinding Operations
260(13)
8.4.6.1 External Cylindrical Grinding
260(3)
8.4.6.2 External Centerless Grinding
263(2)
8.4.6.3 Internal Cylindrical Grinding
265(1)
8.4.6.4 Internal Centerless Grinding
266(2)
8.5 Wheel Speed and Workpiece Feed
268(1)
8.6 Problems
268(2)
8.7 Review Questions
270(3)
Chapter 9 Abrasive Finishing Processes 273(32)
9.1 Introduction
273(1)
9.2 Honing
273(10)
9.2.1 Honing Kinematics
276(2)
9.2.2 Process Components
278(1)
9.2.3 Process Description
279(1)
9.2.4 Process Characteristics
280(3)
9.3 Lapping
283(11)
9.3.1 Process Components
285(3)
9.3.2 Mechanics of Lapping
288(2)
9.3.3 Process Characteristics
290(3)
9.3.4 Lapping Operations
293(1)
9.4 Superfinishing
294(8)
9.4.1 Kinematics of Superfinishing
298(2)
9.4.2 Process Characteristics
300(2)
9.5 Polishing
302(1)
9.6 Buffing
302(1)
9.7 Review Questions
303(2)
Chapter 10 Modern Abrasive Processes 305(28)
10.1 Ultrasonic Machining
305(16)
10.1.1 Mechanism of Material Removal
307(3)
10.1.2 Solved Example
310(2)
10.1.3 Factors Affecting Material Removal Rate
312(6)
10.1.4 Dimensional Accuracy
318(1)
10.1.5 Surface Quality
318(2)
10.1.6 Applications
320(1)
10.2 Abrasive Jet Machining
321(6)
10.2.1 Material Removal Rate
322(4)
10.2.2 Applications
326(1)
10.3 Abrasive Water Jet Machining
327(6)
10.3.1 Process Characteristics
329(4)
10.4 Abrasive Flow Machining 333(6)
10.5 Problems
336(2)
10.6 Review Questions
338(1)
Chapter 11 Magnetic Field-Assisted Finishing Processes 339(12)
11.1 Introduction
339(1)
11.2 Magnetic Abrasive Finishing
339(7)
11.2.1 Process Description
341(1)
11.2.2 Process Characteristics
342(9)
11.2.2.1 Material Removal Rate and Surface Finish
342(2)
11.2.2.2 Applications
344(2)
11.3 Magnetic Float Polishing
346(1)
11.4 Magnetorheological Finishing
347(1)
11.5 Magnetorheological Abrasive Flow Finishing
347(2)
11.6 Review Questions
349(2)
Chapter 12 Mass Finishing Operations 351(18)
12.1 Introduction
351(1)
12.2 Process Components
351(4)
12.2.1 Media
351(4)
12.2.2 Compounds
355(1)
12.3 Mechanical Mass Finishing
355(7)
12.3.1 Barrel Finishing
355(2)
12.3.2 Vibratory Finishing
357(1)
12.3.3 Centrifugal Barrel Finishing
358(1)
12.3.4 Centrifugal Disc Finishing
359(1)
12.3.5 Spindle Finishing
360(2)
12.4 Electrochemical Mass Finishing
362(2)
12.4.1 Machining Principles
362(1)
12.4.2 Factors Affecting Material Removal
363(1)
12.4.3 Applications
364(1)
12.5 Electropolishing
364(2)
12.6 Review Questions
366(3)
Chapter 13 Machining by Electrochemical Erosion 369(28)
13.1 Introduction
369(1)
13.2 Principles of ECM
369(2)
13.3 Advantages and Disadvantages of ECM
371(1)
13.3.1 Advantages
371(1)
13.3.2 Disadvantages
371(1)
13.4 Material Removal Rate by ECM
371(7)
13.5 Solved Example
378(1)
13.6 ECM Equipment
379(2)
13.7 Process Characteristics
381(2)
13.8 Economics of ECM
383(2)
13.9 ECM Applications
385(5)
13.10 Chemical Machining
390(2)
13.11 Solved Example
392(1)
13.12 Problems
393(2)
13.13 Review Questions
395(2)
Chapter 14 Machining by Thermal Erosion 397(38)
14.1 Introduction
397(1)
14.2 Electrodischarge Machining
397(14)
14.2.1 Mechanism of Material Removal
397(5)
14.2.2 EDM Machine
402(4)
14.2.3 Material Removal Rates
406(1)
14.2.4 Surface Integrity
407(1)
14.2.5 Heat-Affected Zone
408(1)
14.2.6 Applications
409(2)
14.3 Laser Beam Machining
411(7)
14.3.1 Material Removal Mechanism
412(3)
14.3.2 Solved Example
415(1)
14.3.3 Applications
415(3)
14.4 Electron Beam Machining
418(9)
14.4.1 Material Removal Process
419(2)
14.4.2 Solved Example
421(3)
14.4.3 Applications
424(3)
14.5 Ion Beam Machining
427(1)
14.6 Plasma Beam Machining
427(6)
14.6.1 Material Removal Rate
430(2)
14.6.2 Applications
432(1)
14.7 Problems
433(1)
14.8 Review Questions
434(1)
Chapter 15 Hybrid Machining Processes 435(14)
15.1 Introduction
435(1)
15.2 Hybrid Electrochemical Processes
435(5)
15.2.1 Electrochemical Grinding
435(3)
15.2.2 Electrochemical Honing
438(1)
15.2.3 Electrochemical Superfinishing
439(1)
15.2.4 Electrochemical Buffing
439(1)
15.2.5 Ultrasonic-Assisted Electrochemical Machining
440(1)
15.3 Hybrid Thermal Processes
440(7)
15.3.1 Electroerosion Dissolution Machining
441(2)
15.3.2 Abrasive Electrodischarge Grinding
443(1)
15.3.3 Abrasive Electrodischarge Machining
443(2)
15.3.4 EDM with Ultrasonic Assistance
445(1)
15.3.5 Electrochemical Discharge Grinding
446(1)
15.3.6 Brush Erosion Dissolution Mechanical Machining
446(1)
15.4 Problems
447(1)
15.5 Review Questions
448(1)
Chapter 16 Micromachining 449(18)
16.1 Introduction
449(1)
16.2 Conventional Micromachining
449(3)
16.2.1 Diamond Microturning
450(2)
16.2.2 Microdrilling
452(1)
16.3 Abrasive Micromachining
452(3)
16.3.1 Microgrinding
452(1)
16.3.2 Magnetic Abrasive Microfinishing
453(1)
16.3.3 Microsuperfinishing
454(1)
16.3.4 Microlapping
454(1)
16.3.5 Micro-Ultrasonic Machining
454(1)
16.4 Nonconventional Micromachining
455(10)
16.4.1 Micromachining by Thermal Erosion
455(5)
16.4.1.1 Micro-EDM
456(3)
16.4.1.2 Laser Micromachining
459(1)
16.4.2 Micromachining by Electrochemical Erosion
460(3)
16.4.3 Hybrid Micromachining Processes
463(10)
16.4.3.1 Chemical-Assisted Mechanical Polishing
463(1)
16.4.3.2 Mechanochemical Polishing
464(1)
16.4.3.3 Electrolytic In-process Dressing of Grinding Wheels
464(1)
16.5 Review Questions
465(2)
Chapter 17 Machining Composite Materials 467(24)
17.1 Introduction
467(1)
17.2 Reinforcing Materials
467(4)
17.3 Matrix
471(1)
17.4 Machining of Composites
472(1)
17.5 Chip Formation
473(6)
17.5.1 Cutting Particulate-Reinforced Composites
474(1)
17.5.2 Cutting Unidirectional Composites
474(4)
17.5.2.1 Sharp-Edged Tools
475(3)
17.5.2.2 Nose Radiused Tools
478(1)
17.5.3 Cutting Multidirectional Composites
478(1)
17.6 Traditional Machining Operations
479(7)
17.6.1 Turning
479(2)
17.6.2 Drilling
481(3)
17.6.3 Milling and Trimming
484(1)
17.6.4 Grinding
485(1)
17.7 Nontraditional Machining
486(3)
17.7.1 Abrasive Water Jet Machining
486(1)
17.7.2 Laser Beam Machining
487(1)
17.7.3 Electrodischarge Machining
488(1)
17.8 Machining Defects
489(1)
17.9 Problems
489(1)
17.10 Review Questions
490(1)
Chapter 18 Vibration-Assisted Machining 491(14)
18.1 Introduction
491(1)
18.2 Kinematics of VAM
491(5)
18.2.1 1-D VAM
491(3)
18.2.2 2-D VAM
494(2)
18.3 Advantages of VAM
496(1)
18.4 Vibration-Assisted Conventional Machining
497(4)
18.4.1 Turning
497(1)
18.4.2 Drilling
498(1)
18.4.3 Milling
499(1)
18.4.4 Grinding
500(1)
18.5 Nonconventional Vibration-Assisted Machining
501(3)
18.5.1 Electrodischarge Machining
501(1)
18.5.2 Electrochemical Machining
502(1)
18.5.3 Abrasive Waterjet Machining
503(1)
18.6 Review Questions
504(1)
Chapter 19 Machinability 505(18)
19.1 Introduction
505(1)
19.2 Conventional Machining
505(11)
19.2.1 Judging Machinability
505(2)
19.2.2 Relative Machinability
507(1)
19.2.3 Factors Affecting Machinability
508(3)
19.2.3.1 Condition of Work Material
509(1)
19.2.3.2 Physical Properties of Work Materials
510(1)
19.2.3.3 Machining Parameters
510(1)
19.2.4 Machinability of Engineering Materials
511(12)
19.2.4.1 Machinability of Steels and Alloy Steels
511(2)
19.2.4.2 Machinability of Cast Irons
513(1)
19.2.4.3 Machinability of Nonferrous Metals and Alloys
514(1)
19.2.4.4 Machinability of Nonmetallic Materials
515(1)
19.3 Nonconventional Machining
516(6)
19.4 Review Questions
522(1)
Chapter 20 Machining Process Selection 523(20)
20.1 Introduction
523(1)
20.2 Factors Affecting Process Selection
523(18)
20.2.1 Part Features
523(2)
20.2.2 Part Material
525(1)
20.2.3 Dimensional and Geometric Features
525(2)
20.2.4 Surface Texture
527(5)
20.2.5 Surface Integrity
532(1)
20.2.6 Production Quantity
533(4)
20.2.7 Production Cost
537(1)
20.2.8 Environmental Impacts
537(3)
20.2.9 Process and Machine Capability
540(1)
20.3 Review Questions
541(2)
References 543(4)
Index 547
Professor Hassan El-Hofy was born on February 9, 1953, in Egypt. He received a B. Sc Honors degree in Production Engineering from Alexandria University (Egypt) in 1976, and then served as a teaching assistant in the same department and received a Master of Science in Production Engineering from Alexandria University in 1979. Professor El-Hofy has had a successful University career in education, training, and research. Following M. Sc, he worked as an assistant lecturer until October 1980 when he left to Aberdeen University in Scotland and began his Ph D work with Professor J. McGeough in hybrid machining processes. He won the Overseas Research Student (ORS) Award during the doctoral degree that has been completed in 1985. He came back to Alexandria University and resumed his work as an assistant professor. In 1990 he was promoted to an associate professor in. He was on leave as a visiting professor for Al-Fateh University in Tripoli between 1989 and 1994.

In July 1994, Professor El-Hofy returned to Alexandria University and in November 1997 he was promoted to a full professor. In September 2000 he was selected to work as a professor in the University of Qatar. He chaired the accreditation committee for mechanical engineering program toward ABET Substantial Equivalency Recognition that has been granted to the College of Engineering programs in 2005. Due to his role in that event, he received Qatar University Award and a certificate of appreciation.

Professor El-Hofy wrote his first book titled "Advanced Machining Processes: Nontraditional and Hybrid Processes'' which has been published by McGraw Hill Co in March 1, 2005. His second book titled "Fundamentals of Machining Processes-Conventional and Nonconventional Processes" has been appeared in September 2007 by CRC, Taylor and Francis. The coauthored book titled "Machining Technology-Machine Tools and Operations" published by CRC, Taylor and Francis in 2008. In 2011 the fourth book titled "Manufacturing Technology- Materials, Processes, and Equipment" was also launched by CRC, Taylor and Francis. He published over 70 scientific and technical papers, and supervised many graduate students in the area of machining by nontraditional methods. He is a Consulting Editor to many international journals and a regular participant in international conferences.

Between August, 2007, and August 2010 he was the chairman of the Department of Production Engineering, College of Engineering of Alexandria University where he was teaching several machining and related technology courses. In October 2011 he was nominated as the vice dean for education and student's affairs at the college of Engineering, Alexandria University. In December 2012 he became the dean of the School of Innovative Design Engineering at Egypt-Japan University of Science and Technology (E-JUST) in Alexandria, Egypt. At the same time he was a professor of machining at the Department of Industrial Engineering and Systems Management at E-JUST. He worked as the acting vice president of research from December 2014 to April 2017 at E-JUST.