Three Common Gate Types in The Processing Of Automotive Injection Parts
May 01, 2022
The processing of injection molded parts is a very demanding process. It is not only necessary to effectively control each injection molding process, but also to master the use of injection molds, which involves the concept of gate. It is one of the important components of the injection mold, and there are different types to meet the molding requirements of different injection parts.
In the process of injection molding parts, there are three common gate types, namely direct gate, rectangular gate and fan gate. Among them, the most widely used is the direct gate. Its biggest advantage is that it can meet the low melt pressure during the injection molding process, making it easy to mold. And it is suitable for any commonly used plastics, mainly some larger and deeper injection molded parts.
The position of the rectangular gate is generally opened on the parting surface of the injection mold, so it is more used in the mold of small and medium injection molding parts. Because its cross-sectional shape is relatively simple, it is relatively easy to process, and it is also easy to correct later. However, the rectangular gate is prone to gate traces, which is its biggest disadvantage.
The fan gate is actually evolved from the rectangular gate, so it has many similarities with the rectangular gate, but it is suitable for injection molding large flat and thin-walled injection parts.
Injection molding is a workpiece after transfer molding through thermosetting plastics, and molding is a molding workpiece. Obviously, these are two different processes, so injection molding and molding cannot be the same. What are the differences? Take a look at the content below to know.
Let's first understand the characteristics of this molding process. The thermosetting plastic transfer molding process is to close the mold before feeding, so that the plastic raw material is heated and melted in a separate feeding cavity; Enter the cavity, and continue to be heated and pressed in the mold to solidify and form.
It can be seen from this that the transfer molding of thermosetting plastics is to mold the mold first and then pour it, while the compression molding is to feed the material first and then close the mold, and heat and pressurize it in the cavity. Moreover, the former has a gating system, while the latter does not have a gating system; in addition, the gas of the transfer mold during the molding process is not easy to be discharged in the cavity, so it is necessary to open an exhaust groove, but it is not necessary for compression molding.
