The test solution cup product is shown in Figure 1. The maximum size of the product is ?144.63 mm x 190.22 mm, the average thickness of the plastic part is 5.50 mm, the material of the plastic part is AS, the shrinkage rate is 1.005, and the quality of the plastic part is 393.95 grams. The technical requirements of plastic parts are that there must be no defects such as peaks, dissatisfaction with injection molding, flow lines, pores, warpage deformation, silver streaks, cold materials, jet lines, etc.
It can be seen from Figure 1 that there are 3 bone positions on the outer side of the circumference of the small end of the plastic part of the cup body, and one external thread through hole column position; there are 3 intermittent threads at the small end of the inner hole, and a small slider core needs to be designed; the inner hole large end There are two buckles, which need to design the inner slide core pull; the shape of the plastic part needs to be designed with a Hough large slide. The difficulty of the mold design is that the inner and outer slides are interlaced and the positions interfere.
The size of the plastic part is larger, plus the outer size is larger, the size is 8 sliders, the mold design rank is 1 out 1, the mold base is GCH5050A140B120C120; the gating system is designed with a large nozzle design, and the molten plastic enters the parting surface through the sprue sleeve Then, the glue is injected along the 3-point side gate of the inner hole.
The three inner sliding blocks 68 at the small end of the plastic part are driven by T-slots, and the sprue sleeve doubles as a shovel. The sliding block groove is opened in the front mold (piece 63), and the pressing block 67 is guided and pressed tightly. The small threaded hole slider 69 on the side of the front mold is driven by an oil cylinder. The outer diameter of this thread is formed by two Haval large sliders.
The two Hough large sliders 29 are rear mold sliders to avoid interference with the two inner sliders 29; in order to improve the mold clamping accuracy of the two inner sliders, two sets of circular taper positioning blocks are designed on the joint surface. Due to the large height of the two Hough sliders, the guide strip 73 (pressing strip) must be designed at the waist of the slider and fixed on the template with screws 74. Due to the small space position of this sliding block, the shovel 33 is used to drive the T-block 34 to drive. The Huff slider is limited by a spring 38 and a positioning nail 35.
The inner sliding block 49 is driven by a shovel 55. The sliding block is small and sandwiched between two Hough large blocks.
Due to the special shape of the plastic part, it cannot be ejected by a thimble, so four ejector blocks 52 are used at the edge of the plastic part to eject. Since the ejector block is at the bottom of the slider, a reset mechanism needs to be designed.
The center nozzle ejector pin 79 is installed on the delayed ejector plate 78. Therefore, after the ejector plate 12 is ejected, the delayed ejector plate 78 will eject the central nozzle material to realize the automatic separation of the gate and the plastic part in the mold.
