Push rod on the slider of plastic shell injection mold

A push rod is added to the slider of the injection mold for the plastic shell, plastic ABS, and the shrinkage rate is 0.5%. The plastic part is long and has five lateral core pulls. The large tightness of the plastic part against the side core pulling will cause the side wall to be deformed or even broken. Effective measures must be taken in the design of the injection mold to prevent deformation and fracture of the plastic part when the core is pulled. Next, Shanghai Mulan Injection Mold Factory will introduce in detail the push rod on the slider of the plastic shell injection mold.

1. Structural analysis of injection mold

The injection mold is a single cavity, the plastic part is long, and the point gate gating system is adopted, which is beneficial to the melt filling. Die blank model: 3060-DCI-A90-B90-340-0. The lateral core-pulling mechanism adopts the conventional structure of 'inclined guide pillars and ten sliders', but the difference is that two sliders at both ends are added. The purpose is to prevent the plastic part from being deformed or even cracked due to the excessive tightness of the core-pulling force on the opposite side of the plastic part during core pulling. This makes the structure inside the slider very complicated. Since the internal main structure of the sliders at both ends is the same, Shanghai Mulan Injection Mold Factory only draws the structure of a slider to simplify the structure diagram of the vertical injection mold. The plastic part is pushed out by the push rod.

2. Working process of injection mold

A push rod is added to the slider of the plastic shell injection mold, and the melt enters the cavity through the point gate gating system. After solidification and molding in the cavity, the injection mold is pulled and opened by the injection molding machine. Under the action of the fixed-distance parting mechanism of the three-plate mold in Shanghai Mulan Injection Mold Factory, the mold is opened from the parting surface 1, and the opening distance is 165mm, which is controlled by a small tie rod. During this process, the runner aggregate is separated from the fixed template under the action of the pull rod, and is automatically separated from the plastic part. Then the mold is opened from the parting surface 2, and the opening distance is 10mm, which is controlled by the limit nail. When the parting surface 2 is opened, the runner push plate pushes the runner condensate out of the pull rod to complete the automatic de-casting. The mold is opened from the parting surface 3, and the opening distance can be 200mm, which is controlled by the injection molding machine. When the parting surface 3 is opened, the five sliders in the injection mold will pull the core laterally under the movement of the inclined guide posts. Since there is a matching plane on the pressing block of the slider that is consistent with the mold opening direction, under the action of the reverse push rod, the push rod in the slider will not move laterally 13.5mm before the parting surface 3 is opened, thus Hold the plastic part and offset the tightness of the core-pulling force on the opposite side of the plastic part, so that the plastic part will not be deformed. After the lateral core pulling is completed, the plastic part is pushed away from the injection mold by the push rod.

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