In recent years, my country's plastic machine industry […]
In recent years, my country's plastic machine industry has developed rapidly. The plastic machine adopts vacuum adsorption on the surface of the mold, and forms after cooling. It is widely used in plastic packaging, lighting, advertising, decoration and other industries. However, at present, it is mainly based on large-scale blister machines, and its molding process is constantly changing during the development process. There are three elements in the molding process of a large blister machine: the raw materials of the large blister machine, the forming equipment, the set conditions and the forming mold.
The primary problem for large-scale blister machine materials to be processed into products is the formability of large-scale blister machine materials, that is, the degree of difficulty of forming and processing. This is not only related to its own physical, chemical and mechanical properties, but also related to the plasticization, flow, and die process conditions of the process materials. In the past, the solution to this problem mainly relied on human experience, but human experience was limited and could not solve such problems satisfactorily. Many scholars have carried out a lot of theoretical and experimental research work, and the computer simulation of the forming process has entered the stage of practical application. With the increasing variety of large-scale blister machines, the products continue to expand, and the forming process continues to innovate.
There are many innovations in injection molding and extrusion molding, and sheet thermoforming technology is also developing rapidly. The degree of automation of the equipment is getting higher and higher, and the computer fully automatic control has been realized in extrusion, injection and thermoforming. However, the design and manufacturing of molds still lag behind the development of equipment and process methods, which are mainly manifested in the low level of mold design and manufacturing, long production cycles, and short service life.
In the past two five-year plans, high-precision processing equipment has been introduced, and the design and manufacturing of molds have been technically transformed, which has brought my country's mold manufacturing technology to a higher level. For example, a complete set of injection molds for a fully automatic two-cylinder washing machine, a complete set of injection molds for TVs over 25 inches, a set of injection and compression molds for cars, and miniature gears and shafts in precision instruments. It not only meets the design accuracy requirements, but also shortens the cycle greatly, creating favorable conditions for product upgrading.