Die is the mother of industry, and its importance is increasingly recognized by people. Die planning and die making skills have made great progress. The innovation of die processing skills, the extensive application of various new materials for dies, the standardization and specialization of die components, etc. have forced us to design more accurately and quickly to adapt to the development of dies.
So, what functions do die fittings need in the stamping process to benefit the precision and service life of dies?
When the blank is plasticized and deformed in the die cavity, it flows and slides along the outer surface of the cavity, causing severe friction between the outer surface of the cavity and the blank, and then causing the die to fail due to wear. Therefore, wear resistance is one of the basic and very important functions of dies.
Hardness is the main factor affecting wear resistance. Generally, the higher the hardness of die parts, the smaller the 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.
When the die works at a high temperature, it will cause the hardness and strength to decrease, resulting in early wear of the die or plastic deformation and failure. Therefore, the die material should have a high resistance to tempering stability.
Some dies, such as plastic molds, exist chlorine, fluorine and other elements in the plastic. After heating, HCI, HF and other strong corrosive gases are decomposed, corroding the outer surface of the die cavity, increasing its surface roughness and aggravating wear and failure.
The working conditions of the die are mostly very harsh, and some are often subjected to large impact loads, which can lead to brittle cracking, so the die should have high strength and resistance. The endurance of the die depends mainly on the carbon content, grain size and structure of the material.
Some dies are in a state of repeated heating and cooling during operation, causing the outer surface of the cavity to undergo stress effects of tensile and compressive forces, causing cracking and peeling of the outer surface, increasing friction, preventing plastic deformation, reducing dimensional accuracy, and then causing die failure.
Cold and hot fatigue is one of the main forms of failure of hot working dies. Such dies should have a high cold and hot fatigue resistance function.