Blow Mould Processing Technology

Blow mould processing, also known as hollow blow molding, is a rapidly developing plastic processing method

Blow mold parts process began to be used in the production of low-density polyethylene bottles during World War II. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers can reach thousands of liters, and some productions have adopted computer control. Plastics that are suitable for blow molding include polyethylene, PVC, polypropylene, polyester, etc. The obtained hollow containers are widely used as industrial packaging containers. According to the method of making the blank, blow molding can be divided into extrusion blow molding and injection blow molding. Newly developed technologies include multi-layer blow molding and stretch blow molding.

Physically speaking, electrical discharge machining is a "micro-cutting" process that relies on discharge erosion. The machining process is extremely slow. During the local high-temperature discharge erosion process of electrical discharge machining on the surface of the blow mold parts material, the physical and mechanical properties of the material surface will be damaged to a certain extent, often leading to the generation of fine cracks on the cavity surface, and the surface roughness cannot meet the requirements of the mold. Therefore, after the electrical processing, the class of parts of the cavity often requires laborious and time-consuming manual grinding and polishing. The production efficiency of electrical discharge machining is very low, and the manufacturing quality is unstable. In many cases, the mold has become a key factor affecting the speed of new product development.

The emergence of high-speed blow mould processing technology has opened up a new way for mold manufacturing technology

In modern mass production, there is no high-level mold, and there is no high-quality product. Molds also play an important role in improving production efficiency and reducing production costs for enterprises. According to the latest international statistical analysis, 75% of metal parts rough processing, 50% of precision processing, and 90% of plastic parts are completed by mold processing. Therefore, the mold industry is also known as the "crown industry". Nowadays, mold manufacturing has become an important part of advanced manufacturing technology.

The material used to manufacture molds is usually a difficult-to-machine material, and the blow mould cavity is generally formed by CNC and electrical discharge machining (EDM). However, the production efficiency of electrical machining is very low, and it cannot meet the requirements of modern mass production in terms of mold development speed or mold manufacturing quality. It is an inevitable trend to replace electrical machining with high-speed machining as much as possible to accelerate mold development speed and improve mold manufacturing quality.