The surface treatment technology of precision mold accessories is a system engineering that changes the morphology, chemical composition, organizational structure and stress state of the surface of precision mold accessories through surface coating, surface modification or composite treatment technology to obtain the required surface properties. Nitriding process has gas nitriding, ion nitriding, liquid nitriding and other ways, each of which has several kinds of nitriding technology, which can adapt to the requirements of different steel types and different workpieces. From the way of surface treatment, it can be divided into: chemical method, physical method, physical chemical method and mechanical method. Although new treatment technologies aimed at improving the surface properties of precision mold parts continue to emerge, the main applications in the manufacturing of precision mold parts are nitriding, carburizing and hardened film deposition. Because the nitriding technology can form a surface with excellent performance, and the nitriding process has good coordination with the quenching process of precision mold parts steel, at the same time, the nitriding temperature is low, there is no need for intense cooling after nitriding, and the deformation of precision mold parts is very small, so the surface strengthening of precision mold parts is the earliest and most widely used nitriding technology.

In addition to requiring high enough strength and toughness in the work of precision mold accessories, its surface performance is crucial to the working performance and service life of precision mold accessories. The improvement of these properties, relying solely on the improvement and improvement of the base material is very limited and uneconomical, and through surface treatment technology, you can often receive twice the result with half the effort, which is also the reason for the rapid development of surface treatment technology. These surface properties refer to: wear resistance, corrosion resistance, friction coefficient, fatigue performance, etc.

The purpose of carburizing precision mold parts is mainly to improve the overall strength and toughness of precision mold parts, that is, the working surface of precision mold parts has high strength and wear resistance, and the technical idea introduced is to replace the higher level material with a lower level material, that is, by carburizing and quenching, so as to reduce manufacturing costs. Hardened film deposition technology was first applied to tools (cutting tools, cutting tools, measuring tools, etc.), with excellent results, and a variety of tools have been coated with hardened film as a standard process. At present, CVD and PVD are more mature technology of sclerotic film deposition. In order to increase the bonding strength of the surface of the film layer, a variety of enhanced CVD and PVD technologies have been developed. Precision mold accessories have been coated with hardened film technology since the 1980s. Under the current technical conditions, the cost of hardened film deposition technology (mainly equipment) is higher, still only in some precision, long-life precision mold accessories applied, if the use of heat treatment center, the cost of coating hardened film will be greatly reduced, more precision mold accessories if the use of this technology, can improve the overall level of China’s precision mold accessories manufacturing.