Although the structure of the mold may vary widely depe […]
Although the structure of the mold may vary widely depending on the variety and performance of the plastic, the shape and structure of the plastic product, and the type of injection machine, the basic structure is the same. The mold is mainly composed of a pouring system, a temperature control system, a molding part and a structural part. Among them, the casting system and molding parts are the parts that directly contact the plastic, and change with plastics and products. They are the most complicated and most variable parts of the mold, and require the highest processing smoothness and precision.
The injection mold is composed of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out plastic products. In order to reduce the heavy mold design and manufacturing workload, injection molds mostly use standard mold bases.
The gating system refers to the part of the flow channel before the plastic enters the cavity from the nozzle, including the main flow channel, the cold material cavity, the shunt channel, and the gate.The gating system is also called the runner system. It is a group of feeding channels that direct the plastic melt from the injection nozzle to the cavity. It usually consists of the main channel, the runner, the gate and the cold cavity. It is directly related to the molding quality and production efficiency of plastic products.
It is a passage in the mold that connects the injection nozzle of the injection molding machine to the runner or cavity. The top of the main flow channel is concave so as to engage with the nozzle. The diameter of the inlet of the main flow channel should be slightly larger than the diameter of the nozzle (0.8mm) to avoid overflow and prevent blockage of the two due to inaccurate connection. The diameter of the inlet depends on the size of the product, generally 4-8mm. The diameter of the main flow channel should be enlarged inward at an angle of 3 ° to 5 ° in order to facilitate the release of the flow path excess.