IT设备设计向导&塑胶件设计

harrybj

Executive Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2.0 Design Guidelines
2.1 Use of the Design Guidelines . . . . . . . . . . . . . . . . . . .3
2.2 Recycling Information Technology Equipment
2.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.2.2 Automated Separation . . . . . . . . . . . . . . . . . . . .4
2.2.3 Current Challenges . . . . . . . . . . . . . . . . . . . . . .4
2.2.4 Implications for Design . . . . . . . . . . . . . . . . . . .5
2.3 Material Selection
2.3.1 Less is Better . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.3.2 Resin Compatibility . . . . . . . . . . . . . . . . . . . . . .7
2.3.3 Recyclable Materials . . . . . . . . . . . . . . . . . . . . .7
2.3.4 Contaminants . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.3.5 Hazardous/Toxic Additives . . . . . . . . . . . . . . . .8
2.3.6 Total Cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.4 Use of Recycled Plastic
2.4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.4.2 Verification of Physical Properties . . . . . . . . . .9
2.5 Basic Part Design Concepts
2.5.1 Optimize Design/Avoid Over Design . . . . . . .10
2.5.2 Lifetime Extension . . . . . . . . . . . . . . . . . . . . . .10
2.5.3 Design for Disassembly . . . . . . . . . . . . . . . . .10
2.5.4 Wall Thickness . . . . . . . . . . . . . . . . . . . . . . . . .11
2.5.5 Stiffness (Ribs/Bosses/Gussets) . . . . . . . . . . .11
2.6 Fastening and Joining
2.6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.6.2 Metal Fasteners . . . . . . . . . . . . . . . . . . . . . . . .13
2.6.3 Metal Inserts . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.6.4 Plastic Fasteners . . . . . . . . . . . . . . . . . . . . . . .15
2.6.5 Snap Fits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.6.6 Integral (Molded-in) Hinges . . . . . . . . . . . . . .17
2.6.7 Adhesives . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2.6.8 Welding and Bonding . . . . . . . . . . . . . . . . . . .17
2.6.9 Swaging and Heat or Ultrasonic Staking . . . .18
2.6.10 Spring (Speed) Clips . . . . . . . . . . . . . . . . . . .19
2.6.11 Metal Nuts, Bolts,Washers and Screws . . . . .19
2.6.12 Design for Reuse . . . . . . . . . . . . . . . . . . . . . .20
2.7 Coatings and Finishes
2.7.1 Thermal Compatibility . . . . . . . . . . . . . . . . . . .21
2.7.2 Decorative . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2.7.3 Functional . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
2.8 Material Identification and Marking
2.8.1 Marking for Plastic Identification . . . . . . . . . . .23
2.8.2 Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.8.3 Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.9 Plastic Processing
2.9.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
2.9.2 Implications for Part Recycling . . . . . . . . . . . .25
2.9.3 Heat History/Thermal Degradation . . . . . . . . .26
3.0 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
4.0 Appendices
Appendix A: American Plastics Council Members . .28
Appendix B: Information Technology Industry
Subcommittee Members and
Information Contributors . . . . . . . . . . . . . . . . . . . . .29
Appendix C: Environmental Standards . . . . . . . . . .31
Appendix D: Environmental Initiatives Affecting
Product Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Appendix E: Resources Organizations . . . . . . . . . . .33
Publications/Other Information Resources . . . . . . . .35
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . .38
【文件名】:071130@52RD_卡钩的设计资料.rar
【格　式】:rar
【大　小】:2207K
【简　介】:
【目　录】:




Introduction
1. Plastics Materials – An Overview 10
1.1 Classification 11
1.1.1 Thermoplastics 12
1.1.2 Thermosets 12
1.1.3 Crystalline, Amorphous, and Liquid 13
Crystalline Polymers 13
1.1.4 Copolymers 14
1.1.5 Alloys 14
1.1.6 Elastomers 14
1.1.7 Additives, Reinforcements, and Fillers 14
2. Physical Properties and Terminology 15
2.1 Density 15
2.2 Specific Gravity 15
2.3 Water Absorption 15
2.4 Mold Shrinkage 15
2.5 Opacity/Transparency 16
2.6 Elasticity 16
2.7 Plasticity 16
2.8 Ductility 16
2.9 Toughness 16
2.10 Brittleness 17
2.11 Notch Sensitivity 17
2.12 Lubricity 17
2.13 Homogeneity 17
2.14 Heterogeneity 17
2.15 Isotropy 17
2.16 Anistropy 17
2.17 Significance of Elasticity, Homogeneity, 18
and Isotropy
3. Mechanical Properties 19
3.1 Basic Definitions 19
3.1.1 Stress 19
3.1.2 Normal Stress 20
3.1.3 Normal Strain 20
3.1.4 Modulus of Elasticity 21
3.1.4.1 Proportional Limit 21
3.1.4.2 Yield Point 21
3.1.4.3 Ultimate Strength 22
3.1.4.4 Elastic Limit 22
3.1.4.5 Secant Modulus 22
3.1.4.6 Yield Strength 22
3.1.5 Poisson’s Ratio 22
3.1.6 Shear Stress 23
3.1.7 Shear Modulus 23
3.2 Relating Material Constants 23
3.2.1 Direct Shear 23
3.2.2 True Stress 24
3.3 Other Measures of Strength and Modulus 24
3.3.1 Compression Strength and Modulus 24
3.3.2 Bending Strength and Modulus 25
3.4 Rate Dependence of Mechanical Properties 25
3.5 Time-Related Mechanical Properties 26
3.5.1 Creep 26
3.5.2 Apparent or Creep Modulus 27
3.5.3 Creep Rupture 27
3.5.4 Stress Relaxation 28
3.5.5 Extrapolating Creep and Relaxation Data 28
3.5.6 Impact Loading 28
3.5.7 Izod Impact 28
3.5.8 Charpy Impact 29
3.5.9 Tensile Impact 29
3.5.10 Falling Dart Impact Test 30
3.5.11 Fatigue Endurance 30
4. Thermal Properties 31
4.1 Melting Point 31
4.2 Glass Transition Temperature 31
4.3 Vicat Softening Point 31
4.4 Deflection Temperature Under Load 32
4.5 Coefficient of Linear Thermal Expansion 32
4.6 Thermal Conductivity 32
4.7 Aging at Elevated Temperatures 33
4.8 Temperature Index (UL) 33
4.9 Flammability 33
4.10 Effect of Temperature on Mechanical 33
Properties
4.10.1 Strength, Modulus, and Elongation 33
4.10.2 Creep 35
4.10.3 Impact 35
4.10.4 Fatigue 35
5. Electrical Properties 36
5.1 Conductivity in Solids 36
5.2 Volume Resistivity 36
5.3 Surface Resistivity 37
5.4 Dielectric Strength 37
5.5 Dielectric Constant (Permittivity) 37
5.6 Dissipation Factor 38
5.7 Arc Resistance 38
5.8 Comparative Tracking Index (CTI) 38
6. Environmental Considerations 39
6.1 Factors Affecting Environmental Resistance 39
6.1.1 Stress Level 39
6.1.2 Temperature 39
6.1.3 Exposure 39
6.2 Chemical Compatibility 39
6.2.1 Reaction 39
6.2.2 Solvation 39
6.2.3 Plasticization 40
6.2.4 Environmental Stress Cracking 40
6.3 Weathering Resistance 40
7. Structural Analysis 42
7.1 Introduction 42
7.2 Defining the Structure 42
7.2.1 Loads 42
7.2.1.1 Directly Applied Loads 42
7.2.1.2 Strain-Induced Loads 43
7.2.2 Support Conditions 43
7.2.2.1 Free (Unsupported) 43
7.2.2.2 Guided 43
7.2.2.3 Simply Supported 43
7.2.2.4 Held (Pinned) 43
7.2.2.5 Fixed (also Clamped or Built-In) 43
7.2.3 Simplifications and Assumptions 44
7.3 Safety Factors 44
7.3.1 Failure Criteria 44
7.3.2 Beam Bending Stress 47
7.3.3 Shear Stress, Torsion 47
7.3.4 Shear Stress, Direct Shear 48
7.4 Pressure Vessels 49
7.5 Press-Fits 49
7.6 Thread Strength 50
7.7 Pipe Threads 51
7.8 Impact Loads 52
7.9 Thermal Stress 53
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hia

xxxxxxxxx骗人啊

langqizhu

<DIV class=quote><B>以下是引用<I>hia</I>在2007-11-30 12:59:07的发言：</B>
xxxxxxxxx骗人啊</DIV>


???

harrybj1

不错,就是都是英文的,看不懂

zyy1029

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