Page 515 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Section 19.3 Injection Molding

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FIGURE l9.9 Typical products made by injection molding, including examples of insert
molding. Source: (a) Courtesy of Plainfield Molding, Inc. (b) Courtesy of Rayco Mold and
Mfg. LLC.
Gate Cavity Sprue

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Main
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Cavity Main Sprue Guide Branch Guide pin
runner pin runner
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FIGURE l9.I0 Illustration of mold features for injection molding. (a) Two-plate mold with
important features identified. (b) Schematic illustration of the features in a mold. Source:
Courtesy of Tooling Molds West, Inc.
dies), cores, cavities, cooling channels, inserts, knockout pins, and ejectors. There
are three basic types of molds:
I. Cold-runner, two-plate mold: This design is the simplest and most common, as
shown in Fig. 19.11a.
2. Cold-runner, three-plate mold (Fig. 19.11b): The runner system is separated
from the part When the mold is opened.