Gastrow Injection Molds 4E: 130 Proven Designs

Front Matter......Page 1
Preface to the Third Edition......Page 3
Preface to the First Edition......Page 4
Table of Contents......Page 5
1.1 Types of Injection Molds......Page 9
1.2.1 Solidifying Systems......Page 10
1.2.2 Hot Runner Systems......Page 14
1.2.3.1 Molds for Processing Elastomers......Page 18
1.2.3.2 Molds for Processing Thermosets......Page 19
1.3 Temperature Control in Injection Molds......Page 22
1.4 Types of Ejectors......Page 24
1.6.2 Prototype Molds of Aluminum......Page 26
1.7 Status of Standardization for Injection Molds......Page 27
1.7.3.1 DIN ISO 12165 "Tools for Molding-Components of Compression and Injection Molds and Die-Casting Dies"......Page 28
1.7.3.2 DIN 16769 "Components for Gating Systems - Terms"......Page 29
1.9 Injection Mold for Producing Test Specimens from Thermoplastic Resins......Page 30
1.10.1 General Requirements for Materials......Page 31
1.10.2.2 Prehardened Steels......Page 32
1.10.2.4 Corrosion Resistant Steels......Page 34
1.10.3.1 Aluminum Alloys......Page 35
1.10.3.3 Copper Alloys......Page 36
1.10.5 Surface Treatment Methods......Page 37
1.10.5.4 Hard Nickel Plating......Page 38
1.10.5.5 Hard Materials Coating......Page 39
1.11.1 Notch Effect under Static Stress......Page 40
1.11.2 Notch Effect under Dynamic Stress......Page 41
1.12 Thermal Insulation and Reflector Plates......Page 42
1.13 Further Reading on Injection Mold Construction......Page 43
2.12 Venting Components......Page 45
2.27 Core Puller, Curved......Page 46
2.41 Displacement Slides......Page 47
2.43 Forcible Demolding of Undercuts......Page 48
3.1.2 Part Release/Ejection......Page 49
3.2.3 Demolding......Page 51
3.3.3 Feeding via Runners......Page 54
3.4 Five-Cavity Injection Mold for Tablet Tubes Made from Polystyrene......Page 56
3.5.1 Mold......Page 58
3.6.2 Cavity Pressure and Cavity Wall Temperature......Page 60
3.7.2 Mold Design and Construction......Page 62
3.7.3 Runner System/Gating......Page 64
3.7.5 Part Release/Ejection......Page 65
3.8.2 Gating and Temperature Control......Page 66
3.9 Injection Mold for Magnifying Glass Frame with Handle......Page 68
3.10.3 Demolding......Page 70
3.10.4 Cooling......Page 71
3.11.4 Part Release/Ejection......Page 72
3.12.5 Part Release/Ejection......Page 74
3.13.4 Mold Temperature Control......Page 76
3.15 Injection Mold with Reduced Opening Stroke for Milk Crates from Polyethylene......Page 78
3.16.1 Construction of the Mold Figs. 2 to 5......Page 80
3.16.4 Mold Operation......Page 81
3.17.3 Part Release/Ejection......Page 83
3.18.2 Operation of the Mold......Page 85
3.19.1 Mold Operation......Page 87
3.20.3 Literature......Page 89
3.21.4 Demolding......Page 91
3.22 Mold for a Pump Housing and Pump Piston Made from Polyacetal......Page 93
3.23 Hot-Runner Injection Mold for Two Film Spools Made from High-Impact Polystyrene......Page 95
3.25 Mold for Bushings from Polyamide with Concealed Gating......Page 98
3.26 Injection Mold for the Valve Housing of a Water-Mixing Tap Made from Polyacetal......Page 99
3.27 Mold for a Lid with Three Threads Made from Polyacetal......Page 101
3.28 Two-Cavity Injection Mold for Coupling Sleeves Made from Polyamide......Page 103
3.29.1 Molded Part......Page 105
3.29.2 Mold......Page 106
3.29.5 Part Release/Ejection......Page 107
3.30.2 Operation of the Mold......Page 109
3.31.1 Application in Injection Molding of Caps.........Page 111
3.31.2 ...and of Casing Parts......Page 113
3.32.6 Materials Used in the Mold......Page 115
3.33.3 Ejection of the Molded Part......Page 117
3.34.3 Literature......Page 119
3.35 Mold for a Polyamide V-Belt Pulley......Page 121
3.36.2 Mold Temperature Control......Page 123
3.37.4 Demolding......Page 125
3.38.3 Part Release/Ejection......Page 127
3.39.3 Demolding......Page 131
3.40.4 Heating the Hot Runner System......Page 134
3.40.5 Operation......Page 138
3.41 2 × 8-Cavity Stack Mold for Lozenge Box Made from Polystyrene......Page 139
3.42.2 Centering and Guidance......Page 142
3.42.5 Demolding......Page 143
3.43.2 Construction and Operation of the Stack Mold......Page 146
3.44.5 Part Release/Ejection......Page 150
3.45.4 Part Release/Ejection......Page 152
3.46.3 Part Release/Ejection......Page 154
3.47.4 Part Release/Ejection......Page 156
3.48.4 Part Release/Ejection......Page 158
3.49.1 Runner System/Gating......Page 160
3.49.3 Part Release/Ejection......Page 161
3.50.3 Part Release Ejection......Page 162
3.51.2 Cooling......Page 164
3.51.4 Reference......Page 165
3.52.1 Mold......Page 167
3.53 Four-Cavity Hot-Runner Unscrewing Mold for Cap Nuts Made from Polyacetal POM......Page 169
3.54.2 Cooling......Page 171
3.54.4 Literature......Page 174
3.55 2 × 16-Cavity Two-Component Injection Mold for Microswitch Covers Made from Polyamide and Thermoplastic Elastomer......Page 175
3.55.2 Feed Side......Page 176
3.55.4 Ejector Side......Page 177
3.55.6 Temperature Control......Page 178
3.56 32-Cavity Hot-Runner Mold for Production of Packings Made from Polyethylene......Page 179
3.57.1 Design Features of the Mold......Page 181
3.58.1 Mold......Page 183
3.59 Two-Component Injection Mold for Drink Can Holders Made from Polypropylene and Ethylene-Propylene Terpolymer......Page 185
3.59.2 Gate......Page 186
3.59.4 Demolding......Page 187
3.60.2 Demolding......Page 188
3.60.4 Clamping Operation......Page 190
3.61.2 The Process......Page 191
3.62.5 Operation......Page 193
3.63.7 Heating......Page 195
3.64 Injection Compression Mold for a Plate Made from Melamine Resin......Page 197
3.65 Five-Cavity Unscrewing Mold for Ball Knobs Made from a Phenolic Resin......Page 198
3.66 Four-Cavity Injection Mold for a Thin-Walled Housing Made from a Phenolic Resin......Page 199
3.67 Thermoset Injection Mold for a Bearing Cover Made from Phenolic Resin......Page 202
3.68.3 References......Page 204
3.69.2 Mold......Page 208
3.70.4 Part Release/Ejection......Page 210
3.71.1.1 Unscrewing Mechanism......Page 212
3.72.2 Part Release/Ejection......Page 214
3.73.3 Part Release/Ejection......Page 216
3.74.5 Part Release/Ejection......Page 218
3.75 Mold for Long, Thin, Tubular Parts Made from Polystyrene......Page 220
3.76.2 Part Release/Ejection......Page 222
3.77.2 Part Release/Ejection......Page 224
3.78 Eight-Cavity Injection Mold for Battery Caps with Undivided External Thread and Sealing Cone Made from Polypropylene......Page 226
3.79 Injection Mold for a Curved Pouring Spout Made from Polypropylene......Page 228
3.80 Injection Mold for an ABS Goggle Frame......Page 230
3.81.3 Cooling......Page 232
3.81.4 Demolding......Page 234
3.82.1 Part Release/Ejection......Page 235
3.83 Two-Cavity Injection Mold for Runnerless Production of Polycarbonate Optical Lenses......Page 237
3.84 Injection Mold with Hydraulic Core Pull for a Cable Socket......Page 239
3.85.1 Installation of the Nozzle......Page 241
3.85.2 Temperature Control......Page 242
3.86 Two-Cavity Mold for Water Tap Handles Made from PMMA......Page 243
3.87 Two-Cavity Injection Mold for the Automatic Molding of Conveyor Plates onto a Wire Cable......Page 245
3.88.3 Literature......Page 247
3.89 Injection Mold with Attached Hydraulic Core Pull for Automatic Measuring Tubs Made from PC......Page 249
3.90.1 Mold Design for 48 Cavities......Page 251
3.90.3 Literature......Page 254
3.91.1 Mold Temperature Control......Page 255
3.92.2 Demolding......Page 257
3.93 Injection Mold with Air Ejection for Polypropylene Cups......Page 259
3.94.3 Design Details......Page 261
3.94.7 Stamper Inserts......Page 262
3.95.2 Mold Operation......Page 263
3.96.2 Operation of the Mold......Page 266
3.96.3 References......Page 268
3.97.1 Part Release/Ejection......Page 269
3.98.2 Machine......Page 271
3.99 Two-Cavity Injection Mold for Handle Covers Made from Glass-Fiber-Reinforced Polyacetal......Page 273
3.99.1 Mold......Page 274
3.100 Four-Cavity Injection Mold for Thin-Walled Sleeves Made from Polyester......Page 276
3.101 Injection Mold for a Microstructure Made from POM......Page 278
3.102 Injection Mold for Production of Adjustable Climate Control Vents via 3-Shot Molding......Page 280
3.102.1 Mold - Principle of Operation......Page 281
3.102.2 Station 1 - Mold Section for the Louvers Fig. 3......Page 282
3.102.6 Mold Temperature Control......Page 283
3.103.6 Step 2a:......Page 284
3.103.7 Step 2b:......Page 285
3.104 Six-Cavity Injection Mold for Retaining Nuts Made from Polyamide with Metal Inserts......Page 286
3.105.5 Part Release/Ejection......Page 288
3.106.5 Part Release/Ejection......Page 290
3.107.4 Ejection......Page 292
3.108.4 Part Release/Ejection......Page 295
3.109.6 Step 2a:......Page 298
3.109.7 Step 2b:......Page 299
3.110.5 Step 1:......Page 300
3.110.6 Step 2:......Page 301
3.111.6 Step 2a:......Page 302
3.111.7 Step 2b:......Page 303
3.112.5 Step 1:......Page 304
3.112.7 Mold Closing......Page 305
3.113.2 Mold......Page 306
3.114.4 Part Release/Ejection......Page 308
3.115.3 Venting......Page 310
3.116.5 Part Release/Ejection......Page 312
3.117.3 Part Release/Ejection......Page 314
3.118.3 Part Release/Ejection......Page 316
3.119.5 Part Release/Ejection......Page 318
3.120.4 Demolding......Page 320
3.121.1 Mold......Page 322
3.121.6 Step 3......Page 324
3.121.7 Step 4......Page 325
3.122.2 Part Release/Ejection......Page 326
3.123.2 Gating......Page 328
3.123.4 Cooling......Page 330
3.124 Single-Cavity Injection Compression Mold for Thermoset V-Belt Pulley Injection Transfer Mold......Page 331
3.125.3 Ejection......Page 333
3.126.3 Part Release/Ejection......Page 335
3.127.4 Literature......Page 337
3.128.3 Station I......Page 339
3.128.8 Mold Temperature Control......Page 341
3.129.2 Part Release/Ejection......Page 342