When selecting mold materials, three requirements need to be met: first, the mold meets the work requirements such as wear resistance and toughness; Second, the mold meets the process requirements; Third, the mold must meet the requirements of economic adaptability.

When selecting mold materials, three requirements need to be met: first, the mold meets the work requirements such as wear resistance and toughness; Second, the mold meets the process requirements; Third, the mold must meet the requirements of economic adaptability.

Silicone product molds need to meet the following working conditions:

1. Abrasion resistance

Severe friction occurs between the blanks, which is easy to cause mold wear and failure. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold. The main factor affecting wear resistance is hardness. Generally speaking, the higher the hardness of the mold parts, the less wear and the better the wear resistance. In addition, the type, quantity, shape, size and distribution of carbides in the material also have a certain impact.

2. Strong toughness

The working environment of most molds is very harsh, and some molds are often subjected to large impact loads, resulting in brittle fracture. In order to prevent the mold parts from suddenly brittleness during work, the mold is required to have high strength and toughness. The toughness of the mold mainly depends on the carbon content and grain size of the material.

3. Fatigue fracture characteristics

During the working process of the mold, fatigue fracture is often caused due to the long-term action of cyclic stress. With small energy, multiple impact fatigue fracture, tensile fracture, contact fatigue fracture and bending fatigue fracture. Fatigue fracture properties mainly depend on the strength, toughness, hardness and inclusion content of the mold.

4. High temperature performance

As the working temperature increases, the hardness and strength of the mold will decrease, resulting in the failure of the silicone mold due to early wear or plastic deformation. The mold material should have high anti-tempering stability to ensure that the mold has high hardness and strength at working temperature.

5. Temperature resistance

Cold and heat fatigue resistance Some molds are in a state of repeated heating and cooling during the working process, so that the surface of the cavity is subjected to tensile and compressive stress, causing surface cracks and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, resulting in mold failure. Hot and cold fatigue