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Characteristics of silicone molds
A standard silicone mold is mainly reflected in the following characteristics:
1. Wear resistance
Severe friction occurs between the blanks, which easily leads to the failure of the mold due to wear. Therefore, the wear resistance of the silicone material is one of the most basic and important properties of the mold. Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.
2. Strong toughness
Most of the working conditions of the mold are very bad, and some often bear a large impact load, which leads to brittle fracture. In order to prevent the sudden brittleness of the mold parts during operation, the silicone mold must 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 performance
During the working process of the silicone mold, fatigue fracture is often caused under the long-term action of cyclic stress. Its forms include small-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of silicone molds mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.
4. High temperature performance
When the working temperature of the mold is high, the hardness and strength will decrease, resulting in early wear of the mold or plastic deformation and failure. Therefore, the silicone mold material should have high anti-tempering stability to ensure that the mold has high hardness and strength at working temperature.
5. Heat and cold fatigue resistance
Some molds are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be subjected to tension, pressure and stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, resulting in Mold failure. Hot and cold fatigue is one of the main forms of failure of hot work dies, and such dies should have high resistance to cold and heat fatigue.
6. Corrosion resistance
Some materials for making silicone rubber product molds, such as plastic molds, are at work. Due to the presence of chlorine, fluorine and other elements in the plastic, strong corrosive gases such as HCI and HF are decomposed after heating, and the surface of the bedroom mold cavity is increased. degree, aggravating wear failure.
1. Wear resistance
Severe friction occurs between the blanks, which easily leads to the failure of the mold due to wear. Therefore, the wear resistance of the silicone material is one of the most basic and important properties of the mold. Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.
2. Strong toughness
Most of the working conditions of the mold are very bad, and some often bear a large impact load, which leads to brittle fracture. In order to prevent the sudden brittleness of the mold parts during operation, the silicone mold must 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 performance
During the working process of the silicone mold, fatigue fracture is often caused under the long-term action of cyclic stress. Its forms include small-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of silicone molds mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.
4. High temperature performance
When the working temperature of the mold is high, the hardness and strength will decrease, resulting in early wear of the mold or plastic deformation and failure. Therefore, the silicone mold material should have high anti-tempering stability to ensure that the mold has high hardness and strength at working temperature.
5. Heat and cold fatigue resistance
Some molds are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be subjected to tension, pressure and stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, resulting in Mold failure. Hot and cold fatigue is one of the main forms of failure of hot work dies, and such dies should have high resistance to cold and heat fatigue.
6. Corrosion resistance
Some materials for making silicone rubber product molds, such as plastic molds, are at work. Due to the presence of chlorine, fluorine and other elements in the plastic, strong corrosive gases such as HCI and HF are decomposed after heating, and the surface of the bedroom mold cavity is increased. degree, aggravating wear failure.
