The first point: wear resistance
When the blank is plastic degenerated in the mold cavity, the outer surface of the cavity both moves and slides, causing violent conflict between the appearance of the cavity and the blank, and then leads to the failure of the mold due to abrasion, so the wear resistance of the material is the most basic of the mold, One of the most important functions.
Hardness is the primary factor affecting the wear resistance.Generally, the higher the hardness of the mold parts, the smaller the wear, the better the wear resistance.Otherwise, the wear resistance is also associated with the type of carbide species, the number of , Shape, size and distribution.
The second point: strong patience
Most of the mold operating conditions are very poor, and some often bear a greater impact load, and then lead to brittle cracking. In order to avoid rupture of the mold parts suddenly ruined in operation, the mold to have a higher strength and patience.
Mold resistance mainly depends on the carbon content of the material, grain size and the state of the organization.
The third point: fatigue cracking function
Die work process, the role of cyclic stress in the long time, often lead to fatigue cracking. The way there are small energy repeated impact tired fatigue cracking, fatigue, fatigue, fatigue cracking and tired touch fatigue cracking.
Mold fatigue cracking depends primarily on its strength, patience, hardness, as well as the amount of Guess in the inclusion.
Fourth point: high temperature function
When the mold working temperature is higher, will make the hardness and strength decreased, leading to pre-wear or plastic deformation of the mold failure due to mold information should have a high anti-tempering stability to ensure that the mold at operating temperature, with Higher hardness and strength.
Fifth point: resistance to hot and cold fatigue function
Some molds are repeatedly heated and cooled in the process of operation, so that the cavity surface is subjected to tension and pressure stress, causing appearance cracks and falling, increasing the collision force, preventing plastic deformation, reducing the scale accuracy, and then lead to Mold failure Hot and cold fatigue is one of the primary methods of hot die failure, to help such molds should have a higher resistance to hot and cold fatigue function.
Sixth point: corrosion resistance
Some molds such as plastic mold in the operation, because plastic guess there are chlorine, fluorine and other elements, the decomposition of heat after the separation of hci, hf and other highly corrosive gases, corrosion mold cavity appearance, increase its surface roughness, increased wear failure .