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JY-MO Engineering Co.,Ltd

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Two common problems in plastic mold
Apr 16, 2018

Guide post injury

The guide pillar plays a leading role in the mould, so as to ensure that the forming surface of the core and cavity is not mutually touching in any case. When the mold is designed, the guide column should not be used as the positioning or locking mechanism.

In the design of the guide column, it is necessary to consider the problem of the blade. Otherwise, the guide column can be turned into a positioning mechanism, and the guide sleeve needs to have a vent hole, which prevents the forming of vacuum mold after the closing of the mold, which produces a great suction force.

In the following situations, the injection process of the core cavity can produce a large four direction of the centripetal force. When the wall thickness of the plastic part is not uniform enough, the plastic flow will increase through the thickness of the wall, and it will generate a large injection pressure here. The lateral asymmetry of the plastic parts, such as the plastic mold of the step parting, is different from the pressure on the ladder, so the width of the parting surface should be considered in the design of the mold.

Dynamic plate bending

When the mold is injected, the molten plastic in the mold cavity generates a huge reverse pressure, usually between 600 and 1000 kg/cm. Mold makers sometimes don't attach importance to this problem, often change the original design size, or replace with low strength steel plate, the dynamic template in the mould of material with a plunger, because on both sides of the large span, cause the injection template under bending. Dynamic template must choose high quality steel, must have the enough thickness, must not use # 45 steel such as low intensity, when necessary, or support block should be set at the bottom of the dynamic template shores, to reduce the thickness of the template, improve the bearing capacity.

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