In addition to the requirement of high enough strength and toughness, the surface performance of the die is very important to the working performance and service life of the die. These surface properties refer to: wear resistance, corrosion resistance, friction coefficient, fatigue performance, etc.
Mould surface treatment technology is a systematic engineering to obtain the required surface properties by changing the shape, chemical composition, structure and stress state of the mold surface through surface coating, surface modification or composite treatment technology. From the way of surface treatment
Although new treatment techniques aimed at improving the surface properties of dies have emerged constantly, the main applications in die manufacturing are nitriding, carburizing and hardening film deposition. Nitriding process includes gas nitriding, ion nitriding and liquid nitriding.
Because the nitriding technology can form a surface with good performance, and the nitriding process and the quenching process of die steel have good coordination, at the same time, the nitriding temperature is low, there is no need for intense cooling after nitriding, and the deformation of the die is very small, so the surface strengthening of the die is the earlier nitriding technology is used, but also the most widely used.
The purpose of die carburizing is to improve the overall strength and toughness of the die, that is, the working surface of the die has high strength and wear resistance.
In order to increase the bonding strength on the surface of the coated workpiece, a variety of enhanced CVD and PVD technologies have been developed. Hardening film deposition technology was first used in tools (cutting tools, cutting tools, measuring tools, etc.) with excellent results. A variety of tools have coated hardening film as a standard process.