The transparent panel injection mold is made of PMMA plastic injection molding. PMMA has the characteristics of high light transmittance, but poor fluidity and difficult injection molding process. Therefore, more attention needs to be paid to transparent panel injection mold design and injection molding process. This article mainly introduces the key points of transparent panel injection mold design.

1. Determine the number of mold cavities according to the size and thickness of the product, and the amount of glue injected by the injection molding machine. The transparent panel is a balanced flow channel. Generally, one mold and two holes are opened. When the size is small, four holes can be opened. If more than 4 holes are opened, it will increase the difficulty of the injection molding machine and increase the defect rate.

2. The choice of parting surface, due to the simple shape of the transparent panel, the parting surface is generally selected to leave the movable mold of the plastic part along the edge of the plastic part. In addition, it is necessary to check the demolding angle of the edge of the plastic part, the demolding angle should be large enough, whether there is a small R on the parting surface, etc.

3. It is very important to choose the glue feeding position of the transparent panel injection mold. For PMMA molds, the mold runner should be bent into an S shape, and the runner end is designed with a long cold slug well, otherwise it is easy to produce gas lines and melt glue during production. trace. The large end of the injection molded part selects the gate to make the plastic easily fill the cavity and make the glue line of the two holes inconspicuous.

4. The design of the exhaust position, generally the transparent panel is not allowed to have thimble marks, so it is necessary to open an auxiliary runner to help eject, this runner also plays a role of exhaust.

5. The choice of steel used for transparent panel injection molds, the general output is less than 100,000, and Japan NAK80 can be used. If the output is large, you need to select S136 or other steel with good grinding performance, heat treatment to HRC48-52, and finish processing Polishing can get very good results.

6. The ejection design of the transparent panel mold. Generally, the transparent plate does not allow the appearance of thimble marks. The ejection of the plastic part is the thimble designed at the injection port. On the small boss of the plastic part, the glue position is extended, and a thimble is added. A thimble is ejected, and the plastic is demolded smoothly.

7. Cooling system design. The front and back molds of the transparent panel injection mold are designed with cooling systems to ensure that the process parameters can be adjusted well during the injection molding process.

8. The main channel of the transparent panel injection mold is facing the cold slug well, and the Z-shaped tie rod design must be used, and the inverted pull material cannot be used.