Stamping technology and die design electrotechnical edition 2

Title: Stamping technology and die design

Book Generation Number: G0 135060

Translator: Yu

Publication date: 20 1 1-08 fixed price: RMB 32.0.

Press: Electronic Industry Press ISBN: 9787121KLOC-0/35064 "Twelfth Five-Year Plan" series of textbooks for general higher education machinery.

Editor in charge: Li Jie

Applicable object:

Graduate undergraduate education > engineering >; Machinery > Material Forming and Control Engineering This book introduces the basic theory of metal stamping in detail. On this basis, the stamping process and die design method of blanking, bending and drawing are emphatically introduced, the multi-station die and automatic die are described in detail, and several special forming methods are briefly introduced. In view of the rapid development of automobile, the common stamping process and die design of automobile panel are introduced.

Audience: This book can be used as a teaching material for undergraduates majoring in mechanical engineering and material engineering in colleges and universities. The suggested class hours are 48 hours. It can also be used as a reference for engineers and technicians engaged in mold design and manufacture. Chapter 1 Basic knowledge of cold stamping 1

1. 1 basic concepts 1

1. 1. 1 characteristics and application of cold stamping

1. 1.2 Basic process of cold stamping 2

1.2 current situation and development direction of cold stamping industry 6

1.3 Types and materials of common cold stamping dies 9

1.3. 1 Types of common cold stamping dies 9

1.3.2 Influence of stamping process on die materials

Basic requirements 10

1.3.3 Common stamping die materials and properties 1 1

1.4 Basic principle of cold stamping deformation 13

1.4. 1 affects the plasticity and deformation resistance of metals.

13 factor

1.4.2 Constant plastic deformation volume condition 15

1.4.3 yield criterion 16

1.4.4 hardening phenomenon in cold stamping 17

1.4.5 Plastic tensile instability and ultimate strain 18

1.5 cold stamping materials and cold stamping formability 22

1.5. 1 Common cold stamping materials 22

1.5.2 Stamping formability of metal plate 23

1.5.3 determination of stamping formability of metal plate 24

1.5.4 basic properties and stamping of metal plate

Relationship between formability 29

1.5.5 forming limit diagram and its application 32

1.6 stamping equipment 34

1.6. 1 Selection principle of stamping equipment 34

1.6.2 common cold stamping equipment 35

1.6.3 Install the mold 36

Exercise 39

Chapter II Stamping and Die Design 40

2. 1 Analysis of punching deformation process and its cross-section characteristics 40

2.2 manufacturability of blanking parts 4 1

2.3 Blanking gap 43

2.3. 1 punching gap 43

2.3.2 Influence of clearance on blanking 43

Determination of gap value 44

2.4 Calculation of Cutting Edge Size of Punching Die 46

2.4. 1 Principles for calculating the dimensions of punch and die 46

2.4.2 When the punch and the die are processed separately, the dimensions are

Calculation of tolerance 46

2.4.3 When the punch and the die are processed together, the dimensions are

Calculation of tolerance 47

2.4.4 Calculation example of matching machining 48

2.5 Determination of blanking force and pressure center 49

2.5. 1 impact force F 49

2.5.2 Method of reducing punching force 49

2.5.3 Calculation of Discharge Force, Thrust and Thrust 50

2.5.4 Select 5 1

2.5.5 Determination of Die Pressure Center 5 1

2.6 Layout 52

2.6. 1 layout 52

Material utilization rate 54

2.6.3 lap joint, strip and strip width determination 54

2.7 Design of main parts of blanking die 56

2.7. 1 mold design 56

Punch design 60

2.7.3 Mold base and guide parts 65

2.7.4 Fixed plate, fixed punch and die, and

The plate-like backboard 68 of its insert

2.7.5 Strip guide plate 69

Positioning part 69

2.7.7 Unloading and ejecting device 73

2.7.8 Closing height of mould 75

2.8 Typical structure of blanking die 77

2.8. 1 Classification of blanking dies 77

2.8.2 Typical structure analysis of stamping die 77

2.8.3 Typical Structure of Punching Die 77

Exercise 83

Chapter III Bending and Die Design 85

3. 1 Bending deformation process and deformation characteristics 85

3. 1. 1 bending deformation process 85

3. 1.2 characteristics of bending deformation 87

3.2 bending process analysis 89

The concept of minimum bending radius and

Influencing factors 89

3.2.2 Sum of values of minimum bending radius

Method for improve 90 degree bending limit deformation degree

3.3 Determination of Bending Process Scheme 92

3.3. 1 manufacturability of bending parts 92

3.3.2 Determination of bending process scheme 96

3.4 Design of Bending Die 97

3.4. 1 Key points of mold structure design 97

3.4.2 Neutral layer position and bending part

Blank length calculation 98

3.4.3 Rebound after Bending Unloading 99

3.4.4 Dimensions of working part of bending die

Calculation of 103

3.4.5 Calculation of Bending Force 106

3.5 Common problems in bending forming and

Solution 108

Exercise 1 12

Chapter IV Drawing Process and Die Design 1 13

4. 1 Basic principle of drawing 1 13

4. 1. 1 Drawing deformation process, characteristics and

Drawing classification 1 13

4. 1.2 Stress of blank during deep drawing

And strain state 1 15.

4.2 technicality of deep-drawn parts 1 16

4.3 Method for Determining the Blank Size of Rotating Body Drawing Parts 1 17

4.4 Deep Drawing of Cylindrical Parts 1 19

4.4. 1 tensile coefficient of cylindrical parts 1 19

4.4.2 Determination of stretching times of cylindrical parts 122

4.4.3 BHF for deep drawing of cylindrical parts

And tension 122.

4.5 Drawing of Other Rotating Parts 123

4.5. 1 axisymmetric curved surface shape parts

Drawing method 123

4.5.2 Drawing dimensions of hemispherical parts

Decisive skills 125

4.5.3 Drawing dimensions of parabolic parts

Decisive skills 125

4.5.4 Cone Part Drawing 127

4.6 Drawing of Box-shaped Parts 130

4.7 Typical Structure of Drawing Die 133

4.8 Common problems in deep drawing and

Solution 136

Exercise 138

Chapter V Other Stamping Forming 140

5. 1 bulging 140

5. 1. 1 undulating formation 140

5. 1.2 tubular projection 14 1

5. Causes and solutions of cracks during bulging of1.3

Preventive measures 144

5.2 Flanging 145

5.2. 1 inner hole flanging 146

Edge flanging 149

5.2.3 Special flanging die structure 15 1

5.2.4 Cracks appear at the edge during flanging.

Causes and preventive measures 153

5.3 necking and flaring 153

5.3. 1 necking deformation characteristics and deformation degree 154

5.3.2 necking process calculation 156

Combustion 157

5.4 spinning 159

5.5 Revision 16 1

5.5. 1 leveling 16 1

5.5.2 Molding 162

Exercise 164

Chapter VI Stamping of Non-axisymmetric Curved Surface Parts such as Automobile Panels 165

6. 1 overview 165

6. 1. 1 the classification and characteristics of covering50000.00000600606

6. 1.2 Requirements of covering parts 167

6. 1.3 die type 168

6.2 Drawing Process and Die Design of Panel 168

6.2. 1 panel 168 Drawing process design

6.2.2 Panel 17 1 Drawing Die Design

6.3 178 Panel Trimming Technology and Trimming Die Design

6.3. 1 panel trimming process design 178

6. 3. 2 180 Panel Trimming Die Design

6.4 186 flanging technology and flanging die design for panel

6.4. 1 panel 186 flanging process design

6. 4. 2 187 panel flanging die design

Exercise 190

Chapter VII Automatic Stamping Die and Multi-station Progressive Die 192

7. 1 Automation of Stamping Production and Automatic Stamping Die 192

7.2 Automatic feeding device 192

7.2. 1 automatic feeding device 192

7.2.2 Common automatic feeding device 194

7.2.3 Automatic loading device 204

7.3 Automatic Delivery Device 2 10

7.4 Automatic detection and protection device 2 12

7.5 Key Points of Automatic Mould Design 2 13

7.6 Multi-station progressive die 2 15

7.6. 1 multi-position progressive die classification 2 15

7.6.2 Design Steps of Multi-station Progressive Die 2 16

7.6.3 Layout Design of Multi-position Progressive Die 2 16

7.6.4 Structural design of multi-position progressive die 224

Exercise 24 1

Chapter VIII Introduction to Special Forming Technology of Sheet Metal 242

8. 1 explosive molding 242

8.2 Electrohydraulic Forming 244

8.3 Electromagnetic Forming 245

8.4 Laser shock forming 246

8.5 Superplastic Forming 247

Exercise 249

Chapter 9 Formulation of Stamping Process Specification 250

9. 1 Basis for formulating stamping process 250

9. 1. 1 machinery for various stamping processes

Features and classifications 250

9. 1.2 Correct design of stamping process and

Controlling the deformation of the blank 253

9.2 Steps and Contents of Making Stamping Process Specification 256

Overview 256

9.2.2 Part Drawing Analysis 256

9.2.3 Determine the production of stamping parts

Process flow 257

9.2.4 Determine the mold type and structural form 26 1

9.2.5 Select punching equipment 262.

9.2.6 Writing process documents 263

Exercise 265

Foreword of Reference 266 This book is compiled according to the catalogue of undergraduate majors promulgated by the Ministry of Education and the needs of teaching reform and textbook construction in general higher education, in order to adapt to the increasingly widely used cold stamping technology and cultivate applied talents with innovative and entrepreneurial ability; It is a teaching book for undergraduates majoring in material molding, mechanical design and manufacturing and its automation (mold direction) in colleges and universities.

Design of Cold Stamping Die is an important professional course in the cultivation of related majors, and Stamping Technology and Die Design is a common book in this course. In order to meet the needs of personnel training, this book strives to integrate theory with production practice and emphasizes the cultivation of application ability in the writing process. Absorb new theories, technologies and processes of this discipline; The difficulty is moderate, the theory is sufficient, the content is rich, and the text is concise and easy to understand.

This book is divided into nine chapters. Firstly, the basic knowledge of stamping forming is introduced, including stamping technology, stamping materials and stamping equipment. Secondly, the basic stamping process and corresponding die design knowledge are introduced emphatically, including blanking, bending, stretching and local forming. On this basis, the related contents of automobile panel die and multi-position progressive die are also introduced. Finally, the special forming process and the formulation of cold stamping process regulations are introduced.

Chapters 1, 3, 6, 8 and 9 were written by Yu of Jinling Institute of Science and Technology, Chapter 4 was written by Liu of Shenyang Hangkong University, Chapters 5 and 7 were written by Nanjing Institute of Science and Technology, and Chapter 2 was written by Li Xiaohai of Jiamusi University.

Due to the limited editing level, shortcomings are inevitable, and readers are kindly requested to make valuable suggestions.

Editor's editor

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