Basic extrusion types in the first section 1
Section 2 Characteristics of Extrusion Process 3
First, reduce the consumption of raw materials 3
Second, improve production efficiency 3
3. Parts 4 with higher dimensional accuracy and smaller surface roughness can be obtained.
4. Machinable parts with complex shapes 4
Verb (abbreviation of verb) improves the mechanical properties of extrusion materials 4
Sixth, the range of plastic processing and forming of materials is expanded.
Section III Development History and Prospect of Extrusion Technology 5
Chapter II Basic Principles of Extrusion 8
The first section in the process of extrusion metal flow law 8
I. Metal Flow of Extruded Solid Parts 8
Two. Metal flow 9 of the extruded hollow part
Three. The metal flow of the back extrusion cup 9
Four. Metal flow of composite extrusion 10
Stress and strain of extrusion deformation in the second quarter 1 1
I. Stress and strain state analysis during extrusion deformation 1 1
Second, the expression method of extrusion deformation degree 12
Additional stress and residual stress of extrusion deformation in the third quarter 14
I. Additional stress 14
Second, the cause of the additional stress 14
Three. Residual stress 15
Four. Harm of additional stress and residual stress 15
Verb (abbreviation of verb) Method of preventing and eliminating additional stress and residual stress 15
Section 4 Effect of Extrusion on Microstructure and Properties of Metal 16
I. Influence on metal structure 16
Second, the influence on mechanical properties 17
Chapter III Preparation of Extruded Blank 20
Section 1 Extrusion of Ordinary Materials 20
I. Requirements for Cold Extruded Raw Materials 20
Second, cold extrusion common materials 22
Three. Forms of common raw materials for cold extrusion 22
Section II Preparation Method of Extruded Blank 23
I. Blank shape and size 23
Second, the blank preparation method 26
Section 3 Softening of Cold Extruded Blank 28
Section 4 Surface and Lubrication of Cold Extruded Blank 30
I. Surface treatment of blank 30
Second, the blank lubrication treatment 32
Chapter IV Calculation of Cold Extrusion Pressure
In the first section, the variation law of extrusion force in the process of cold extrusion 35
Factors affecting unit extrusion force in the second quarter 36
I. Influence of chemical composition and mechanical properties of extruded materials 36
Second, the influence of deformation mode 38
Three. Effect of deformation degree 38
Fourth, the influence of extrusion speed 40
Verb (verb's abbreviation) The influence of mold geometry 40
Six, the influence of the blank relative height of 4 1
Seven, the influence of billet lubrication state 42
The calculation of cold extrusion pressure in the third quarter 43
A, the calculation formula of cold extrusion pressure 43
Second, the theoretical calculation method of unit extrusion force 43
Three. Empirical formula calculation method of unit extrusion force 47
Four, the graphic algorithm of unit extrusion force 49
The fifth chapter cold extrusion deformation process design 57
Section 1 Classification of Cold Extruded Parts 57
Section 2 Design Drawing of Cold Extruded Parts 60
In the third quarter, the allowable deformation degree of cold extrusion 63
I. Factors affecting allowable deformation degree 63
Second, the allowable deformation degree of different materials 63
The fourth quarter precision of cold extrusion parts 67
I. Dimensional Accuracy of Extruded Parts 67
Second, the shape accuracy of cold extrusion 69
3. The surface roughness of cold extruded parts is 7 1.
Section 5 Cold Extrusion Deformation Process Design 72
A, the principle of cold extrusion deformation process 72
Second, the determination of the number of extrusion process 72
Three. Selection of working procedures and determination of arrangement order 73
Four. Design of intermediate preform process 74
Verb (abbreviation of verb) extrusion process design 79
Intransitive verb aided process design 80
Section 6 Cold Extrusion Parts Deformation Process Design Example 80
I. Shaft Parts 80
2. Hollow Parts 8 1
Three. Flange part 82
Four. Toothed portion 85
Verb (abbreviation of verb) cone 90
Chapter VI Design of Cold Extrusion Die 95
The first section cold extrusion die structure analysis 95
I. Characteristics of Cold Extrusion Die 95
Second, the cold extrusion die classification 95
Section 2 Design of Mould Work 10 1
I. Design of the working part of the positive extrusion die 10 1
II. Design of Working Part of Reverse Extrusion Die 104
Three. Manufacturing dimensions and tolerances of reverse extrusion punch and die 108
Section 3 Design of Unloading and Ejecting Device 109
I. Unloading device 109
Two. Ejector 109
Section 4 Pressure Pad Design 1 12
I. Function of the pressure plate 1 12
Second, the design and calculation of pressure pad 1 12
Section 5 Guidance Design 1 13
I. Guidance Method 1 13
Two. Guide device for guide post and guide sleeve 1 14
Section 6 Fastening Methods of Punch and Die 1 15
I. Fastening method of punch 1 16
Second, the fastening method of combined die 1 16
Chapter VII Design of Prestressed Composite Mould 1 17
Chapter VIII Cold Extrusion Die Materials 14 1
Chapter 9 Selection of Cold Extrusion Equipment 157
Chapter 10 Warm Extrusion Technology +07 1
Chapter 11 Preparation of Extrusion Process Regulations 197
Chapter 12 Extrusion New Technology and New Process 203
Reference 2 15
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