1. Structural analysis of plastic parts
Injection mold for bluetooth speaker plastic shell injection mold fixed mold inclined slider moving mold delayed core-pulling, Shanghai Mulan Injection Mold Factory said that the inner surface of the plastic part is a part of a certain toy, the material is ABS, and the shrinkage rate is 0.5% .The size of the plastic parts is not large, so it is required to make two parts in one mold. The plastic part has three outer core pulls and one inner core pull. Due to the special structure and surface requirements of the product, the fixed mold core is formed, and the outer surface of the plastic part is formed by the dynamic mold cavity. For this reason, Shanghai Mulan Injection Mold Factory must complete the inner core pulling of the plastic part by a fixed mold, which makes the design of the metal insert injection mold more difficult.
2. Structural analysis of injection mold
One mold with two cavities, symmetrical arrangement. The six outer core-pulling mechanisms, Shanghai Mulan Injection Mold Factory all adopt the structure of 'oblique guide column + slider'. Since the tightness of the plastic part on the fixed mold core is greater than the adhesion of the plastic part to the moving mold cavity, the outer core-pulling mechanism adopts a delayed core-pulling structure, that is, the oblique hole on the slider is made into a waist-shaped hole, and at the same time Add a 15mm long plane on the slope of the locking block that is consistent with the mold opening direction to ensure that the slider will not leave the plastic part within the first 15mm of the mold opening stroke. The core-pulling structure inside the fixed mold adopts the core-pulling structure of the oblique slider, and the oblique slider is guided and limited by the guide rod. Since the oblique slider has two contact points with the moving model cavity, the oblique slider does not need to be reset. After all the core-pulling mechanisms have completed the core-pulling, the plastic part is pushed out by the push rod.
3. Working process of injection mold
The bluetooth speaker plastic shell injection mold fixed mold inclined slider moving mold delayed core pulling, the melt enters the cavity of the injection mold through the side gate gating system, after
injection molding is completed, the movable and fixed mold is opened under the pull of the injection molding machine. Shanghai Mulan Injection Mold Factory, in the first 15mm of the mold opening stroke, the inclined slider inside the fixed mold is pushed by the spring, and under the guidance of the guide rod, it pulls the core inward sideways, and at the same time the plastic part is separated from the fixed mold insert. pieces. After Shanghai Mulan Mold Factory completes the mold opening stroke of 15mm, the six sliders of the injection mold will pull out the core laterally under the toggle of the inclined guide column. When the mold opening stroke reaches 20mm, the fixed mold inclined The core pulling is stopped under the control of the rod, and the slider continues to complete the outer core pulling under the action of the inclined guide column. The plastic part is pushed away from the movable mold cavity by the push rod.
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