The product diagram of the washing machine soap box is shown in Figure 1. The maximum size of the product is 160 mm x 89.20 mm x 53 mm, the average thickness of the plastic part is 2.0 mm, the material of the plastic part is ABS, the shrinkage rate is 1.005, and the weight of the plastic part is 67.5 grams. . The technical requirements for 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, bubbles and so on.
It can be seen from Figure 1 that the structure of the plastic part contains deep bones on both the front and back sides. That is to say, both the front and back sides of the plastic part have great tightening force for the mold. These deep bones are on the edge of the plastic part. The difficulty of mold design is to first determine the opening direction of the plastic part, and then determine the parting surface of the mold on this basis. After comprehensive consideration, the two places with the largest tightening force are left in the dynamic mold. In view of the key issues of mold design, mold flow analysis was carried out on plastic parts. The content of mold flow analysis includes the relationship between injection time, speed and pressure switching, temperature, pressure, weld line at the front of molten plastic flow, x, y, Z deformation tendency in three directions, etc.
The plastic part has no inverted buckle, no sliding block and inclined top. The mold design cavity ranking is 1 out 2. The mold design drawing is shown in Figure 2. The analysis of the mold opening direction is shown in Figure 3.
The mold base is the standard mold base CI3545, and a zero-degree positioning block is designed on the edge of the mold base to assist the precise clamping and positioning of the mold. Design a tiger's mouth on the four corners of the mold core for precise mold clamping. In addition, the mold is also designed with a counter on the edge of the mold. In order to increase the contact area of the parting surface, four balance blocks are designed at the four corner guide posts of the mold.
After determining the parting surface according to Figure 3, the gate is determined to be a side gate, as shown in Figure 2 and Figure 4. After mold flow analysis, the gating system design can meet the requirements.
The back mold part of the mold has a large tightening force, and push blocks are designed to push out the corners of the outer arc surface of the plastic part and the adjacent two sides. In the rest of the plastic part, the ejector pin is designed.
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