Five brief introductions to the mold structure.

1 parting surface and exhaust system
Generally, it is necessary to stretch the parting surface as much as possible to make it more flat and promote the efficiency of CNC machining. In the formal design, the number of mold cavities needs to be determined, and then the parting line is determined [1]. For the parting line in the parting line, the position needs to be determined according to the actual requirements of the product appearance, to ensure that the breakage is within 0.03mm, and the maximum is within 0.05mm. According to the characteristics and design of the front panel, the shape of the parting surface is reasonably determined to improve the reliability of the mold structure. Generally, the exhaust system is designed at the end of the mold filling. In addition, the depth of the connection between the exhaust groove and the product is in the range of 0.02-0.03mm, the length is about 5mm, and the depth of the exhaust groove is 0.2mm. . This mold can use the movable mold core, ejector rod and slider to cooperate with the clearance to achieve exhaust.

2 Hot runner pouring
The pouring design has a direct impact on the appearance and quality of the product. If the product is deformed, it will seriously affect its assembly performance. According to the front panel appearance requirements, wall thickness, raw material characteristics and shape, etc., the feeding operation is carried out through the horn gate. Since the product is mass-produced, the hot runner pouring system is used. The cross-section of the runner of the system is circular, which makes the processing more convenient and promotes filling and molding. When the mold is ejected, the gate can be automatically analyzed with the product, and when it is ejected, its condensate can automatically fall off [2].

3 ejection reset mechanism
In the design of this link, it is necessary to ensure the balance, and the related actions can be stably realized to ensure the normal production of the mold. Because the mold has a hook and a hook hole, it needs to use the inclined top, dome needle and roof needle to perform the ejection operation. After the moving mold side pouring aggregate is ejected, the horn gate and product can be automatically analyzed. The corresponding stroke switch, forced reset and reset spring of the ejection reset system realize the ejection of the mold panel and the reset operation of the mold to ensure that the condensate can be taken out smoothly.

4 Mold temperature adjustment
When designing an injection mold, the mold temperature adjustment design is a very important joint, which has no substantial impact on the mildness of the mold and the structural feasibility. However, its role in the production efficiency of plastic products is very important, if the cooling system is not reasonable ，It will prolong the cooling time, leading to waste and increase product production costs [3]. Generally, the cooling time accounts for about 80% of the entire injection molding cycle. Therefore, the cooling effect needs to be fully optimized to optimize the cooling effect. The diameter of the water channel is designed to be 8mm and the distance from the product surface is about 15mm. While ensuring that the strength of the mold will not be affected, it will also improve the cooling effect. For the water flow of the cooling system, the flocculation method should be used to prevent the occurrence of laminar flow and provide a guarantee for the cooling effect of the waterway.

5 Detailed design of mold forming parts
After the creation of the parting surface is completed, the fixed mold core and the movable mold core are divided with the aid of the PRO/E software mold separation module, that is, the fixed mold core and the movable mold core are removed using the product 3D and the parting surface, and the Set the size of the plate design, and then determine the size of the mold base. With the help of EMX8.0, the design of the mold base is carried out, and at the same time, the lettering of the hanging mold hole and the benchmark are established, which promotes the processing and the assembly and disassembly of the mold. The part molding is completed in the parting module, and after the design of the molded part is completed, wear-resistant blocks, slider beading, etc. are designed. After that, carry out interference checks on the molded parts to ensure that their dimensions and performance meet the actual requirements.