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M. Matsuda et al.
35.5 E-catalogues of Equipment for Injection Molding
35.5.1 An Injection Molding Machine
The behavior of an injection molding machine is modeled as an activity flow shown in
Fig. 35.8. When receiving an injection molding order in the idling state, the injection
molding state starts. Before this, an adequate mold is prepared and changed. The
injection molding process cycle is repeated until completion of the ordered amount.
There are four processes in the process cycle: injection molding, opening of a mold,
ejection by ejector pins and restoration of the ejector pins. At the beginning of
injection molding process, the starting of the mold temperature control is requested.
At the end of the injection molding process, the stopping of the temperature control
is requested for cooling of a mold. After cooling the mold, it is opened and a request
to the molding extraction robot is sent out. Then the molded part is ejected by the
ejector pins. After receiving acknowledgement of the completed extraction from the
robot, the ejector pins are restored.
Fig. 35.8 Activity diagram
for an injection molding
machine