Due to the distinctive particularity of plastic parts of complex automobile parts, the following factors need to be fully considered in the design of injection molding, such as drying treatment of materials, new requirements of glass fiber reinforced materials for screws, driving form and clamping structure. Firstly, when the commonly used resin materials such as automobile bumper and instrument panel are modified resins such as modified PP and modified ABS, the resin materials have different hygroscopicity. In order to meet the water content requirements during molding (General requirements ≤ 0.2%), the resin raw materials must be subject to hot air drying or dehumidification drying before entering the screw pre molding measurement of the injection molding machine.

EDM is an important process in mold manufacturing, especially in injection mold manufacturing. However, some misunderstandings in EDM in die and mould factories often lead to the failure of machining accuracy, surface and efficiency to meet the requirements. The following will analyze the common misunderstandings of EDM in mold factory.

Mold design and injection molding processing Guide
1 construction materials
The appropriate die steel shall be selected according to the application requirements. In the case of prototype fabrication, hardened die steel is not required. In most cases, pre hardened steel or aluminum is usually used to reduce costs and facilitate mold adjustment during the prototyping stage. These soft metals can also mold enough test pieces and prefabricated parts. Pre hardened die steel (such as P-20 or nakr-55) is often used to make large-scale dies because it is impractical to harden die steel in large applications.

Injection mold manufacturing can be roughly divided into the following steps:
1、 Process analysis of plastic products.
Before the mold design, the designer should fully analyze and study whether the plastic products comply with the injection molding processing principle. It is necessary to carefully negotiate with the product designer and reach a consensus. It includes the necessary discussion on the geometry, dimensional accuracy and appearance requirements of products, so as to avoid unnecessary complexity in mold manufacturing as far as possible.

It is a kind of plastic part or a mold for mass production, which is often used to form one or more plastic parts. Plastic mold is a tool matched with plastic molding machine in plastic processing industry to give plastic products complete configuration and accurate size. The cavity of a plastic mold is composed of a female mold part called a mold cavity and a male mold part called a mold core. The plastic mold is installed on the injection molding machine and fills the mold cavity according to the following time sequence (usually automatic): 1. Mold closing; 2. Inject (hot, almost flowing) plastic into the mold cavity; 3. Keep the mold closed until the plastic is cooled to be ejected; 4. Mold opening; 5. Eject plastic products; 6. If necessary, the injection molding machine can extend the mold opening (MO) time for the next (injection) week

The common problems in plastic mold processing are: 1. If the flying mold is not good, the product will have a sharp edge; 2. Whether the cooling channel can quickly and evenly cool the mold; 3. The design of flow channel should be reasonable and balanced, and the exhaust should be done well; 4. Do not install less wrong parts in the assembly mold, and the movement between modules should be smooth; 5. The size and plastic materials have shrinkage, and the mold size should be multiplied by the material shrinkage; 6. The size of the rubber inlet is appropriate, which makes the product separation difficult and the injection of too small rubber parts is not satisfied; 7. In terms of demoulding and ejection, whether the demoulding slope of the cavity is enough, the surface is polished well, the arrangement of ejector pins should be reasonable, and the stroke of inclined top position should be enough. The high precision, high consistency, high yield, low energy consumption and low consumable