The characteristics of hardware mold accessories

In addition to the requirement of high strength and toughness, the surface performance of hardware mold accessories is very important to the working performance and service life of precision mold accessories. The improvement of these properties is very limited and uneconomical simply relying on the improvement and enhancement of the base material. However, surface treatment technology can often achieve twice the result with half the effort, which is the reason for the rapid development of surface treatment technology. Die polishing technology is an important part of die surface engineering and an important post-processing technology in die manufacturing. Due to the domestic polishing technology and materials there are still some problems, so such as point-and-shoot camera lens injection mold, CD, VCD and tool transparency requirements of the injection mold is still a large part of the dependence on imports.

The mirror die material is not only the problem of chemical composition, but also a series of advanced processes, such as vacuum degassing, argon protection ingot casting, vertical continuous casting and rolling, flexible forging, etc. are required in smelting, so that the mirror die steel has a series of advantages, such as fewer internal defects, fine impurity size, high dispersion degree, fine metal grain size and good uniformity, so as to achieve the requirements of polishing to the mirror die steel. The surface treatment technology of die accessories is a systematic engineering that changes the morphology, chemical composition, organizational structure and stress state of the surface of precision die accessories through surface coating, surface modification or composite treatment technology, so as to obtain the required surface performance. Nitriding process has gas nitriding, ion nitriding, liquid nitriding and other ways, each of which has several kinds of nitriding technology, can adapt to the requirements of different steel types of different workpieces. From the way of surface treatment, it can be divided into: chemical method, physical method, physical chemical method and mechanical method.

It is worth noting that die surface polishing is not only affected by polishing equipment and technology, but also by the mirror degree of die materials, which has not been paid enough attention to, that is to say, polishing itself is restricted by die materials. Although new treatment techniques are emerging to improve the surface properties of precision die parts, nitriding, carburizing and hardened film deposition are the main applications in the manufacture of precision die parts. Because the nitriding technology can form a surface with excellent performance, and the nitriding process has good coordination with the quenching process of steel of precision die accessories, at the same time, the nitriding temperature is low, there is no need for fierce cooling after nitriding, and the deformation of precision die accessories is very small, so the surface strengthening of precision die accessories is the earliest and the most widely used nitriding technology.