The performance of the mold to be confirmed before manufacturing

The performance of the mold to be confirmed before manufacturing

First point: wear resistance

When the blank is plastically denatured in the mold cavity, it moves and slides along the surface of the cavity, resulting in a violent conflict between the surface of the cavity and the blank, and then lead to the failure of the mold due to wear. Therefore, the wear resistance of the material is one of the most basic and important functions of the die.

Hardness is the primary factor affecting wear resistance. In general, the higher the hardness of die parts, the smaller the wear, and the better the wear resistance. In addition, the wear resistance is also related to the type, quantity, shape, size and dispersion of carbides.

Second point: strong patience

The working conditions of molds are mostly very bad, some often bear large impact load, and then lead to brittle cracking. In order to avoid sudden brittle fracture of die parts during operation, the die should have high strength and durability.

The durability of the die mainly depends on the carbon content, grain size and microstructure of the data.

The third point: fatigue cracking function

In the process of die operation, fatigue cracking is often caused by the long-time action of cyclic stress. The methods include small energy repeated impact fatigue cracking, tensile fatigue cracking, touch fatigue cracking and tortuous fatigue cracking.

The fatigue cracking function of the die mainly depends on its strength, resistance, hardness and the content of inclusions in the material.

Point 4: high temperature function

When the working temperature of the die is high, the hardness and strength will decrease, resulting in early wear or plastic deformation and failure of the die. The die data shall have high tempering stability to ensure that the die has high hardness and strength at operating temperature.

Fifth point: cold and hot fatigue resistance function

Some molds are in the state of repeated heating and cooling during operation, so that the surface of the cavity is under the action of tensile and pressure strain stress, resulting in surface cracking and falling off, increasing the conflict force, preventing plastic deformation, reducing the scale accuracy, and then leading to mold failure. Cold and hot fatigue is one of the primary ways of hot working die failure. This kind of die should have high cold and hot fatigue resistance function.

Point 6: corrosion resistance

During the operation of some molds, such as plastic molds, due to the presence of chlorine, fluorine and other elements in the plastic mold, HCI, HF and other highly corrosive gases are decomposed after heating, which corrodes the surface of the mold cavity, increases its surface roughness and aggravates wear failure.