Large injection molding, precision injection molding an […]
Large injection molding, precision injection molding and thin wall injection molding are the three main injection molding forms. Different injection molding processes have different requirements for molds. The characteristics of three different types of injection molds are compared and analyzed, and the research status of various fields in China is summarized on this basis.
With the rapid development of the economy and the improvement of people's living standards, people have higher and higher requirements for the development of large-capacity washing machines, large-screen TVs, automobiles, aerospace, etc., and corresponding large-scale injection molding. At present, there is no unified standard for the division of large injection molds. It is generally believed that molds exceeding 3,000 square centimeters can be called large injection molds. At the same time, there are more than 2 tons of mold mass known as large injection molds.
Compared with ordinary injection molding, large injection molding products have the characteristics of large volume and good quality. Large 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 stiffness 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 injection molds are more complex. In order to improve use efficiency and save raw materials, large injection molds often use modular cavity structures, and more complex cavity combinations have higher requirements.