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Silicone Rubber Products Abrasion Resistance, Toughness
May 10, 2017

In the production of Silicone Rubber Products, mold, the first consideration is the choice of mold raw materials. According to the product quality, quantity, structure, etc. to determine the choice of mold. Mold selection is the whole mold making process is a very important part. Mold selection needs to meet the three requirements: First, the mold to meet the wear resistance, toughness and other work needs; Second, the mold to meet the technological requirements; again, the mold should meet the economic suitability requirements.

(A) mold to meet the working conditions

1, wear resistance

Silicone Rubber Products When the blank is plastically deformed in the mold cavity, it flows and slides along the surface of the cavity, causing severe friction between the cavity surface and the blank, which can easily lead to failure of the mold due to wear. Therefore, the wear resistance of the material is one of the most basic and most important properties of the mold.

Hardness is the main factor affecting wear resistance. Under normal circumstances, the higher the hardness of the mold parts, the smaller the wear, the better the wear resistance. In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.

2, toughness

Silicone Rubber Products Mold working conditions are mostly very bad, and some often bear a greater impact load, resulting in brittle fracture. In order to prevent the mold parts in the work suddenly brittle fracture, the mold to have a high strength and toughness. The toughness of the mold depends mainly on the carbon content of the material, grain size and tissue state.

3, fatigue fracture performance

Silicone Rubber Products Mold work in the process, the long-term role in the cyclic stress, often lead to fatigue fracture. Its form has a small energy multiple impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture.

The fatigue fracture properties of the mold are mainly determined by its strength, toughness, hardness, and the content of inclusions in the material.

4, high temperature performance

Silicone Rubber Products When the mold temperature is high, will make the hardness and strength decreased, leading to early wear or mold plastic deformation and failure. Therefore, the mold material should have a high resistance to tempering stability, to ensure that the mold at the working temperature, with a high hardness and strength.

5, resistance to hot and cold fatigue performance

Silicone Rubber Products Some molds are in the process of repeated heating and cooling, so that the surface of the cavity by the tension, the role of stress stress, causing the surface cracking and peeling, increased friction, blocking plastic deformation, reducing the size of the accuracy, resulting in Mold failure. Hot and cold fatigue is one of the main forms of hot die failure, to help this type of mold should have a high resistance to hot and cold fatigue performance.

6, corrosion resistance

Silicone Rubber Products Some molds such as plastic mold at work, due to the presence of chlorine in the plastic, fluorine and other elements, heat decomposition after the decomposition of HCI, HF and other strong corrosive gases, erosion mold cavity surface, increase its surface roughness, exacerbate wear failure.