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Fig. 35.6 Sequence in an injection molding line
and stopping the actions of a mold temperature controller and a molding extraction
robot. Interactions of all equipment are shown in Fig. 35.6 which is a UML sequence
diagram.
Sequence in an injection molding line is as follows. Pellets which are the raw
material of the injection molded part are put into an injection molding machine,
and are heated and melted. A mold is set on an injection molding machine. After
these preparations, the injection molding process cycle starts. An injection molding
machine requests the mold temperature controller to control the mold’s temperature
by heating or cooling. Melted pellets are weighed. A mold is clamped. An injection
molding machine executes injection and holding pressure. An injection molding
machine requests to stop the mold’s temperature control. An injection molding
machine makes an opening of mold, requests to a molding extraction robot to extract
the molded part and ejects the molded parts by a set of pins. After extraction of the
molded part by a robot, an injection molding machine restores the pins. The injection
process returns to the start of the process cycle and repeats the process until the order
is completed.