The Working Principle of Plastic Injection Mold

Plastic injection mold is an important plastic processing tool, through which plastic raw materials are transformed into products of various shapes and specifications. The principle of injection mold can be summarized as the following steps: 1. Plasticizing and injection First of all, plastic raw materials undergo a series of processing treatments, such as drying, screening, mixing, etc., to become plasticized materials suitable for injection molding. In the heating barrel of the injection machine, the plastic begins to melt and plasticize under the action of heat, forming a uniform molten state. Subsequently, the plasticized plastic is pushed into the nozzle of the injection machine through the pushing action of the plunger or screw. When the plastic in the nozzle accumulates to a certain amount, the driving force of the injection machine stops, and the nozzle of the injection machine injects plastic into the pouring system of the mold. At this point, the pouring system introduces the plastic into the mold cavity. 2. Mold filling Under the pressure of the injection machine, the plastic flows in the mold cavity and fills the entire cavity. In this process, the plastic is subjected to pressure and temperature, and continues to plasticize and melt. At the same time, the cooling system of the mold begins to work, and the heat inside the mold is taken away by the cooling channel or the cooling medium, so that the plastic is quickly cooled and shaped in the cavity.
3. Mold opening and release When the plastic is cooled and hardened in the mold cavity, the mold is opened and the molded plastic product is pushed out of the mold cavity or removed from the mold. This process is called opening and stripping. When the mold is opened, the parting surface of the mold is opened, and the product is pushed out or taken out of the mold. The mold is then closed and ready for the next round of injection molding. 4. Other auxiliary actions In the process of injection molding, some other auxiliary actions are also involved, such as the exhaust of the mold, the adjustment of the ejector mechanism, and the control of the mold temperature. These actions are essential to ensure the quality of the product and the stability of the production. In summary, the principle of plastic injection mold mainly involves plasticizing, injection, filling, cooling, mold opening and mold release steps. These steps are coordinated to complete the injection molding process of plastic products. With the continuous progress of science and technology, plastic injection molding technology is also developing, and new injection machines, molds and processes continue to emerge, providing more choices and possibilities for the production of plastic products.

评论

发表评论

此博客中的热门博文

How does a CNC machining center ensure precision for mass-produced products?

Precision is one of the most important indicators to evaluate the processing performance of a CNC machining center . The processing precision and processing errors have a great impact on the quality of the processed parts. How can a CNC machining center ensure the precision of mass-produced products? The most commonly used processing method in the CNC machining industry is the trial cutting method. The trial cutting method is to try cutting, measure the size, adjust the cutting depth of the tool, cut again, and repeat the process until the required size is achieved. This method can ensure that the error is within a reasonable control range, but it is quite cumbersome and has a low production efficiency. It is mainly used for single-piece and small batch production. In mass automated production, CNC machining centers can achieve the required size by adjusting the relative positions of the machine tool, fixture, workpiece, and cutting tool in advance, thus achieving the goal of ensuring
阅读全文

How to deal with the plastic injection molding raw material is not filled?

图片
Electric injection molding machine in the production of injection mold will encounter the situation of injection molding is not filled, there is a lack of glue at the bone position right Angle and fuse connection, here to share some experience. Analysis of glue injection is not filled: 1. The trapped air in the bone position makes the injection molding machine fill up. 2. The filling of the injection molding machine caused by the glue welding line is not filled. Reason analysis of glue injection is not filled: When the injection molding machine is working, the mold gluing method is two-point gluing, and the injection speed is too fast, which is easy to cause the gas trapped at the right Angle of the bone position and cause the filling dissatisfaction; If the injection speed is too slow, it is easy to fill the fuse at the end of the flow. The solution: Multistage injection molding and position switching. In the first stage, the medium speed filling channel was used to pass
阅读全文

Control of Injection Molding Parts Processing Temperature

图片
There are many kinds of plastic, many plastic materials melting time are different, because the plastic does not have a specific melting point, the so-called melting point is a melting state of the temperature segment, the structure and composition of the plastic molecular chain is different, so the impact on its fluidity is also different, then in the production of injection parts manufacturers in the injection parts processing temperature control is also very important. 1. Mold temperature Some plastic materials due to high crystallization temperature, slow crystallization speed, need higher mold temperature, some due to control size and deformation, or the need for demoulding, to higher temperature or lower temperature, such as PC generally requires more than 60 degrees, and PPS in order to achieve a better appearance and improve fluidity, mold temperature sometimes needs more than 160 degrees, Therefore, the mold temperature has an inestimable effect on improving the appearanc
阅读全文