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Fig.7.6 shows the configuration of mold with internal concaves. The guide pin 2 is fixed in the stationary frame plate 1, the side insert 3 is in the movable mold. The workpiece has two internal concaves.
We operation: when the mold closing, the guide pins slip into the inclined hole of the side inserts 3 When the mold opens, the side inserts 3 is pulled out of the workpiece by the inclined guide pin 2. The workpiece is pushed out of forming core 4 by ejector pin 5.
Characteristics: the opening path of side insert 3 is short.
When the mold is closed, the ejector pin 4 is returned to their initial position by a coil spring 3 or returning pin 5 as shown in Fig7.8. The return spring is dimensioned so as to function reliably even if the fitting gaps are soiled, otherwise the ejector pins may be damaged during closing of the mold. In critical cases the mold with undercut and ejector pin that interferes each other, the use of return pins is recommended as shown in Fig7.9 to Fig 7.11
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Tuofang company is specialized in designing and manufacturing Plastic Injection.
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