Plastic Injection Molding: Mold Design and Construction Fundamentals

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Society of Manufacturing Engineers, 1998 - Technology & Engineering - 193 pages
7 Reviews
Eliminate the guesswork from critical mold aspects such as gate location, shape and size. And discover how to establish proper venting so you can prepare ideal mold venting - before the first shot is made. Both newcomers and experienced practitioners in the area of thermoplastics will benefit from its concise explanations of the methods and equipment used, the components necessary for smart mold design, a checklist for designing a mold, and the variety of finishes and textures available and how they are applied.
 

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Plastic Injection Molding: Mold Design and Construction Fundamentals

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Contents

A Primer on Molds
1
MOLD BASE COMPONENTS
4
The Injection Half of the Mold
5
The Ejector Half of the Mold
9
SUMMARY
13
Mold Design Basics
15
Pressure and Viscosity
17
How Many Cavities?
18
GATING METHODS AND DESIGNS
103
Sprue Gates
105
Various Surface Gates
106
Drop Gates Threeplate Molds
110
Tunnel Gates
112
VENTING
115
SUMMARY
119
QUESTIONS
120

Which Mold Material?
21
MOLD MATERIAL SURFACE ENHANCEMENTS
23
Product Surface Finish and Special Requirements
27
Gate Method and Location
28
Ejector Method and Location
29
Location of Cavities and Cooling Channels
31
Runner Cross Section
33
Venting Concepts
35
MOLD LIFE EXPECTANCIES
36
Rapid Systems
37
Fabrication
38
OWNERSHIP OF THE MOLD AND OTHER TOOLS
39
QUESTIONS
41
Basics of Mold Construction
43
Cavity Retainer Plates
47
Waterline Locations
51
Support Plates and Support Pillars
54
Ejector Housings
57
Determining the Parting Line
58
Shutoff Areas
61
Machining Methods
62
Other Fabrication Methods
64
Polishing and Finishing
68
Textures
69
Plating
71
QUESTIONS
72
Action Areas of the Mold
75
CAMS
77
LIFTERS
78
HANDLOADED INSERTS
81
EJECTION SYSTEMS
82
Stripper Ejector Systems
85
Split Cavity Concept
87
Compressedair Ejection
89
SUMMARY
90
QUESTIONS
91
Runners Gates and Venting
93
RUNNER SYSTEMS
95
Insulated Runners
100
Hot Runners
101
Controlling Mold Temperatures
121
Laminar Flow versus Turbulent Flow
123
Determining Location of Waterlines
126
Bubblers and Cascades
131
HEAT TRANSFER METALS
132
Aluminum
133
Copper Alloys
134
QUESTIONS
135
Mold Alignment Concepts
137
Tapered Locks
139
ALIGNMENT OF MOLD COMPONENTS
141
ALIGNMENT OF MOLD TO MACHINE
146
Platens Tie Bars and Platen Bushings
148
SUMMARY
150
Repairing Protecting and Storing Molds
151
Designing for Repair and Maintenance
152
Repairs by Welding
153
Metal Deposition Process
154
Molds in Production
155
Installing and Setting Up the Mold
156
STORING MOLDS
161
Shortterm Storage
162
QUESTIONS
163
Troubleshooting Product Defects Caused by Molds
165
WHAT CAUSES DEFECTS?
166
COMMON DEFECTS AND REMEDIES
167
Blush
168
Brittleness
169
Clear Spots
170
Cracking
171
Flash
172
Jetting
173
Shrinkage Excessive
174
Warpage
175
Bibliography
177
An Injection Mold Design Check List
179
History of Plastics
181
Answers to Chapter Questions
183
Index
187
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