Injection mold introduction:
Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in the mass production of some complex-shaped parts. Specifically, it refers to the high-pressure injection of the plastic melted by heat into the mold cavity by the injection molding machine, and the molded product is obtained after cooling and solidification.
Basic classification of injection molds:
Injection molds are divided into thermosetting plastic molds and thermoplastic plastic molds according to the molding characteristics; according to the molding process, they are divided into transfer molds, blow molds, casting molds, thermoforming molds, hot press molds (compression molds), injection molds, etc. Among them, the hot press mold can be divided into three types: overflow type, semi-overflow type, and non-overflow type. The injection mold can be divided into two types: cold runner mold and hot runner mold by the gating system; according to the loading and unloading method, It can be divided into two types: mobile type and fixed type.
Large injection molding, precision injection molding and thin-wall injection molding are the three main forms of injection molding. Different injection molding processes have different requirements for molds. The editor made a comparative analysis of the characteristics of three different types of injection molds, and on this basis, summarized the current research status in various fields in China. With the rapid economic development and the improvement of people's living standards, people have higher and higher development requirements in large-capacity washing machines, large-screen TVs, automobiles, aerospace, etc., and corresponding large-scale injection molding. At present, the division of large injection molds has not yet formed a unified standard. It is generally considered that a mold larger than 3000 square centimeters can be called a large injection mold. At the same time, there are more than 2 tons of mold quality called large injection mold. Compared with ordinary injection molding, large injection molding products have the characteristics of large volume and good quality. Large-scale injection molds also have their own positioning and have their own unique requirements in mold design, mold material selection, etc., which are embodied in the following aspects: 1. Cavity, strength, and rigidity requirements. Due to the high pressure of the melt, the cavity of the large injection mold is prone to large deformation, and the elastic deformation increases with the increase of the size and pressure of the cavity. (2) Requirements for cavity composition. Compared with small and medium-sized injection molds, the cavity and core structure of large-scale injection molds are more complicated. In order to improve efficiency and save raw materials, large-scale injection molds often use modular cavity structures, and more complex cavity combinations require higher requirements.