Dry pressing die is an auxiliary tool for dry pressing forming process, and it is also one of the indispensable components for making bulletproof sheet. In fact, the application mode of dry pressing die is very simple, only need to fill the dry powder billet to the mold of the dry stamper. In the cavity, a certain pressure is applied to make the dry powder billet a compact body.
In the process of dry pressing dies, in addition to the dry powder blanks, a certain amount of surfactants, lubricants, adhesives, etc. are also used. The surfactant can be used to change the surface properties of the powder, thereby reducing the agglomeration effect of the ultrafine powder and making it evenly distributed.
Adding the lubricant can reduce the friction between the particles and between the particles and the surface of the dry stamper; the purpose of adding the binder is to enhance the bond strength of the powder. In addition, the molding of the blank must be performed with a press or a dedicated dry press molding machine, as well as a certain pressure and pressing method.
The properties of the dry-pressed green body obtained by dry pressing die are affected by many factors. In addition to the quality of the dry pressing die, the properties of the powder are also involved, including particle size, particle size distribution, shape, moisture content, and the like; Additive characteristics and use effects; pressure during pressing, pressurization and pressurization speed, etc.
However, as long as the above related parameters are well controlled, the use of dry pressing die not only has high production efficiency and less labor, but also has a low scrap rate and a short production cycle. In addition, the manufactured products also have the advantages of high density and high strength. It is very suitable for large-scale industrial production.
Although the cost of dry pressing die is higher than that of ordinary molds, these types of molds have received more and more attention due to the above advantages. Among them, the ceramic production field is prominent, and in addition to the bulletproof sheets, Tiles, wear-resistant ceramic lining tiles, seal rings and other products require the use of dry-pressed dies.