It can be seen from Figure 1 that the plastic part is a flat rectangular shell with multiple long grooves on the top surface for heat dissipation. One side is also designed with a long groove for heat dissipation. In addition, there are multiple function holes on both sides, including USB interface, network cable interface, data input port, various light holes, etc. These three sides of the plastic part all form an undercut buckle, which requires the design of an overall large slider core-pulling. There is an undercut and undercut on the inside of the two side walls of the plastic part, and the inclined top demoulding needs to be designed. The use of HIPS as the material of the plastic parts makes use of its excellent electromagnetic properties.
The size of the plastic part is large, and there are slider core pulls on three sides, so the mold design cavity rank is 1 out. 1. The plastic part's glue feeding method is to feed the glue at the top of the large nozzle plastic part. The front mold, the back mold and the sliding block are designed with cooling water (not shown in the 3D diagram). The ejection of plastic parts is two inclined ejectors and multiple ejector pins. The 3D drawing of the mold is shown in Figure 2. The front mold core diagram is shown in Figure 3. The back mold core diagram is shown in Figure 4.
Modem bottom shell products do not allow slight thimble sharpening on plastic parts, that is, the thimble cannot be completely flush with the top of the back mold core, and the thimble needs to be shortened by 0.1mm to avoid thimble sharpening and affecting product performance.
The three large sliders of the mold are all simplified design methods. The slider is large, the slider seat is reduced, and the upper and lower structures of the slider and the slider seat are combined, which saves mold embryo space and reduces mold costs. Moreover, the upper and lower combination facilitates the design of the water transport apron at the combined position. The combination of the slider and the slider seat is shown in Figure 5.
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