| Description |
1 online resource |
| Contents |
Intro -- The Author -- Preface -- Contents -- 1 Plastic Parts -- 1.1 General Information -- 1.1.1 Comparison of Designs (Conventional vs. Plastic) -- 1.1.2 Special Features of Plastics -- 1.1.2.1 Comparison of the Properties of Plastics and Metals -- 1.1.2.2 Special Mechanical Behavior -- 1.1.3 Reasons for Using Plastics -- 1.2 Design Rules -- 1.2.1 Special Design Features of Injection Molded Parts -- 1.2.1.1 Demoldability -- 1.2.1.2 Flow Path to Wall Thickness Ratio -- 1.2.1.3 Sprue Position -- 1.2.1.4 Avoiding Material Accumulation, Thin Wall Thickness -- 1.2.1.5 Stiffeners -- 1.2.1.6 Dimensional Change due to Temperature Fluctuations -- 1.3 Dimensional Deviations between CAD and Injection Molded Part -- 1.3.1 Shrinkage -- 1.3.2 Warpage -- 1.3.3 Corrective Measures for Dimensional Deviations -- 1.4 Design of Connections -- 1.4.1 Screw Fasteners -- 1.4.2 Snap-Fit Connections -- 1.4.3 Bonding and Welding of Seams -- 1.4.3.1 Adhesive-Bonded Joints -- 1.4.3.2 Welded Joints -- 1.4.3.3 Film Hinges -- 1.5 Tolerances and Dimensions -- 1.6 Sizing -- 2 The Injection Molding Manufacturing Process -- 2.1 The Process and What the Designer Should Know -- 2.1.1 Flow Path Lengths Are Limited -- 2.1.2 Molded Part Area Determines Machine Size -- 2.1.3 Wall Thicknesses Determine the Cooling Time -- 2.1.4 Plastic Shrinks as It Cools -- 2.2 Influence of the Process on Component Properties -- 2.2.1 Weld Lines, Meld Lines -- 2.2.2 Surface Quality -- 2.3 Fiber Orientations Influence the Component Dimensions -- 2.4 Forward-Looking Quality Assurance -- 2.4.1 Sink Marks -- 2.4.2 Jetting -- 2.4.3 Diesel Effect -- 2.4.4 Incomplete Filling, Burr Formation, and Deformation during Demolding -- 2.5 Special Injection Molding Techniques -- 2.5.1 Multi-Component Technology -- 2.5.1.1 General Procedure -- 2.5.1.2 Molding Techniques -- 2.5.1.3 Component Design. |
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2.5.2 Fluid Injection Technology (FIT) -- 2.5.2.1 Processes -- 2.5.2.2 Component Design -- 3 Molds -- 3.1 General Tasks and Functions -- 3.2 Manufacture and Costs -- 3.2.1 General Machining -- 3.2.2 Surfaces -- 3.2.2.1 EDM -- Electrical Discharge Machining -- 3.2.2.2 Etching -- 3.2.2.3 Laser Texturing -- 3.2.2.4 Ceramic Surfaces -- 3.2.3 Steels -- 3.3 Standard Elements -- 3.4 Melt Feed -- 3.4.1 Cold Runners -- 3.4.1.1 Cavity Layout -- 3.4.1.2 Gating to Cavities -- 3.4.1.3 Demolding of the Runner System -- 3.4.2 Mold with Pre-Chamber Nozzle -- 3.4.3 Insulating Channels -- 3.4.4 Hot Runners -- 3.4.4.1 Internally Heated Systems -- 3.4.4.2 Externally Heated Systems -- 3.4.4.3 Hot Runner Nozzles -- 3.4.4.4 Cascade Technology -- 3.5 Temperature Control -- 3.5.1 Concepts for Temperature Control -- 3.5.1.1 Continuous Flow Temperature Control -- 3.5.1.2 Pulse Cooling/Discontinuous Temperature Control -- 3.5.1.3 Variothermal or Intermittent Temperature Control -- 3.5.2 Implementation -- 3.6 Demolding -- 3.6.1 Straight-Line Demolding in the Axial Direction of the Opening Movement -- 3.6.2 Demolding of Contour Areas That Are Not Parallel with the Opening Movement -- 3.6.3 Demolding of Internal Undercuts -- 3.6.4 Demolding of Internal Threads -- 3.7 Increasing Efficiency with Two Parting Planes -- 3.7.1 Stack Molds -- 3.7.2 Tandem Molds -- 3.7.3 Design Features of Stack and Tandem Molds -- 3.7.4 Hot Runner Technology for Stack and Tandem Molds -- 4 Simulation -- 4.1 Goals of Simulation -- 4.1.1 Filling Simulation (Rheological Simulation) for Good Surfaces -- 4.1.2 Warpage Prediction -- 4.1.3 Heat-Flux Analysis -- 4.1.4 Calculation of Mechanical Stability (Structural Mechanics) -- 4.2 Base Models for the Rheological Simulation -- 4.2.1 Shape Models -- 4.2.2 Calculation Models -- 4.2.3 Material Models -- 4.3 Examples and Calculation Results -- 4.3.1 Filling Behavior. |
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4.3.2 Holding Pressure Phase -- 4.3.3 Warpage -- 5 Material Selection -- 5.1 Usual Procedure for Selecting Materials -- 5.1.1 Selection Criterion: Temperature -- 5.1.2 Selection Criterion: Chemical Load -- 5.1.3 Selection Criterion: Mechanical Load -- 5.1.4 Selection Criterion: Special Requirement -- 5.1.5 Databases -- 5.2 Important Characteristic Values -- 5.2.1 Characteristic Temperatures -- 5.2.1.1 Glass Transition Temperature -- 5.2.1.2 Melting Temperature -- 5.2.1.3 Degradation Temperature -- 5.2.2 Heat Deflection Temperature -- 5.2.3 Continuous Service Temperature -- 5.2.4 Young's Modulus and Creep Modulus -- 5.2.5 Temperature Function of Young's Modulus -- 5.3 Limits on Mechanical Design -- 5.3.1 Short-Term Loads -- 5.3.2 Long-Term Loads -- 5.3.3 Estimation of Design Limits Using Reduction Factors -- Index. |
| Other Form: |
Original 1569908931 9781569908938 (OCoLC)1318989332 |
| ISBN |
9781569908945 (electronic bk.) |
|
156990894X (electronic bk.) |
|
1569908931 |
|
9781569908938 |
| Standard No. |
AU@ 000072198309 |
|
AU@ 000072391716 |
|
