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JY-MO Engineering Co.,Ltd

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Injection mold core structure
Apr 16, 2018

Plastic hook distance taut institutions generally used for cavity core-pulling or secondary ejection mould, because this kind of mechanism in the mold of the two side design, its movement request must be synchronized, the clamping buckle at the same time, open mode to a certain position at the same time retractor. Once out of sync, it will cause the injection mold of template scratch or damage to the skew and the design of the structure of the parts require a higher rigidity and wear resistance, adjustment is hard, short life institutions, to avoid as far as possible, you can switch to other design structure

Use spring core-pulling motions are small situations auxiliary ejector method, the core pulling large requires using dynamic model back slide cores, finish core-pulling action again after the structure of the die, the hydraulic oil cylinder can be used on large mould core pulling. The inclined pin sliding block type core mechanism is damaged. The most common defects of this kind of mechanism are the incomplete processing and the small materials, which mainly have the following two problems.

Inclined pin Angle A is large, the advantage is that can be in the shorter injection mold opening mold trip to produce the larger core distance. However, when the suction force F is A certain value, the bending force P=F/COSA of the inclined pin in the core process is also larger, and the inclined pin deformation and inclined hole wear are more easily. At the same time, the inclined pin produces upward thrust N=FTGA, which makes the sliding block increase the positive pressure in the guide surface, thus increasing the frictional resistance of sliding block. Easy to cause slip, guide groove wear. According to experience, Angle A should not be greater than 2.

Some die because of restricted by template area, guide groove length is too small, the slider on the outside of the core-pulling action after the show guide, so that after the core-pulling and mould reset at the beginning of the phase is likely to cause the slider tilt, especially when clamping, slider reset, make the slider damage, even bending failure. According to the experience, the length of the sliding block should not be less than 2/3 of the length of the guide slot after pulling the core.


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