According to the different structures of plastic products and different product requirements, the structure of injection molds is also different. Some common for teflon plastic injection mold process structures include single-parting surface injection molds, multi-parting surface injection molds, inclined guide post lateral core-pulling injection molds, and inclined injection molds. In-pin core-pulling injection molds, and hot runner injection molds.
1. Single parting surface for teflon plastic injection mold process;
Single parting surface injection mold, also known as two-plate injection mold, is commonly used in large nozzle injection molding molds. This type of mold has a simple structure and strong practicability for forming plastic parts, so it is widely used. The disadvantage of this kind of mold is that the gate is large, and a process of removing the gate is often added, and gate marks will be left on the surface of the product. Therefore, it is suitable for injection molding products that do not have high requirements on the surface of the product.
2. Multi-parting surface teflon for teflon plastic injection mold process;
Multi-parting surface injection molds have two or more parting surfaces, of which double-parting surfaces are the most common. The double parting surface injection mold is often called a three-plate mold. Since this mold is often used for products with gated glue, it is also called a fine nozzle mold. Double parting surface injection molds are widely used, mainly used for single-cavity or multi-cavity molds with gates, molds with lateral parting mechanism set on one side of the fixed mold, and plastic parts that need to be parted in sequence. 's mold.
The purpose of the first parting is to pull out the condensate of the runner, and the second parting breaks the feeding port to separate the condensate of the runner from the plastic parts, so that the ejected plastic parts do not need to be removed. Treatment of aggregates.
3. Lateral core-pulling for teflon plastic injection mold process of inclined guide column;
When the side wall of the plastic part has features such as through holes, pockets, bosses, etc., the molding parts must be made to be movable laterally, and the entire mechanism that drives the core to move laterally is called the lateral core pulling mechanism or lateral core pulling mechanism. Core pulling mechanism. There are many types of lateral core-pulling mechanisms, including lateral core-pulling with oblique guide column, hydraulic core-pulling and pneumatic core-pulling, etc. Among them, the most common is the lateral core-pulling mechanism with oblique guide-column, as shown in Figure 3.25. When the mold is opened, the inclined guide column first drives the slider to move outward. When the side core is completely out of the product, the ejector mechanism starts to act to eject the product.
4. Internal core-pulling for teflon plastic injection mold process with inclined pin;
When there are undercuts inside the product, oblique pins need to be used to form these undercuts. Such molds with oblique pins are collectively referred to as inclined pin core-pulling injection molds. The structure of this type of mold is relatively complex, and a diagonal pin mechanism needs to be added to the mold. When opening the mold, first open the front and rear molds, and then the ejection mechanism of the injection molding machine pushes the top plate of the mold to move in the demoulding direction. The stripping mechanism ejects the product.
5. Hot runner for teflon plastic injection mold process;
With the development of rapid automated injection molding process, hot runner injection molds are gradually being promoted and used. The difference between it and the general injection mold is that the plastic in the gating system will not solidify during the injection molding process, nor will it be demolded with the plastic part, so this kind of mold is also called a runnerless mold. The main advantages of this mold are as follows:
①No waste processing is basically realized, which not only saves raw materials, but also saves the process of cutting cold material.
②Reduce the pressure loss of the feeding system and make full use of the injection pressure, which is conducive to ensuring the quality of plastic parts.
Hot runner injection molds are easy to distinguish. Generally, those with the above picture, cables, and mold junction boxes belong to hot runner molds.
Therefore, the hot runner injection mold has a complex structure, high cost, and strict control of mold temperature, which is suitable for mass production.
Yize Mould focuses on the development and production of precision injection moulds. Main business: connector moulds, Teflon injection moulding, medical injection moulds, 100,000-class dust-free injection moulding