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Injection Mold Design Handbook
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25 October 2021

An injection mold is the heart of any plastics molding workcell. Understanding the principles of an injection mold design and its importance to a successful plastic part is fundamental to the success of the product. This book helps guide the designer, engineer, project manager, and production manager in making sure that the injection mold to be designed will work as intended.
This book will take the reader through the process of conceptualizing and designing an injection mold that will produce the desired plastic part. Since it all starts with the plastic part, the book will first focus on key features and details of the plastic part which are necessary for good mold design. The design of the main components of an injection mold will be discussed and good design practices will be shared. Finally the process of testing and gaining customer acceptance of the mold for production will be detailed. A comprehensive appendix and detailed drawings will provide the required detail for completing a mold design.
6. Machine dry cycle
7. Product handling
8. Ejection
b. Mold cost versus performance factors
i. Materials
ii. Complexity
iii. Cavitation
iv. Hot vs cold runner
v. Estimating mold cost
c. Need for prototyping?
i. Cycle
ii. Sizing
iii. Functionality
iv. Customer buy-off
6. Designing a mold
a. Start with the plastic part
b. Basic parts of a mold
c. Steps to designing a mold [Gantt chart]
d. Core cavity design
i. Opening / closing
ii. Strength and sizing
iii. Ejection
iv. Alignment
v. Pre-loads
vi. Cooling
vii. Shrinkage
viii. Mismatches
ix. Venting
x. Materials of construction
e. Mold shoe design
i. Cooling and fittings
ii. Pneumatics
iii. Hydraulics
iv. Materials
v. Alignment
vi. Mounting of cores and cavities
f. Runner design
i. Cold
ii. Hot
g. CAD / Drawings / BOM
7. Testing the mold and approval for production
a. First shots
b. Re-sizing
c. APQP
d. Fine tuning the cycle time and the part quality
e. Approval
f. Moving to serial production
8. Maintenance and longevity of a mold
a. Preventive maintenance checklist