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Surface treatment technology of plastic mold steel
2019-12-20
In addition to the reasonable cooperation of the substrate with high enough strength and toughness, the surface properties of the steel mold are very important to the work performance and service life of the steel mold. These surface properties refer to: wear resistance, corrosion resistance, friction coefficient, fatigue performance, etc. These performance improvements relying solely on the improvement and improvement of the base material are very limited and uneconomical. Through surface treatment technology, they can often get more results with less effort, which is why the surface treatment technology has developed rapidly.
The surface treatment technology of the steel mold is a system engineering that changes the morphology, chemical composition, microstructure and stress state of the surface of the steel mold through surface coating, surface modification or composite treatment technology to obtain the required surface properties. From the surface treatment methods, they can be divided into: chemical methods, physical methods, physical-chemical methods, and mechanical methods. Although new treatment technologies are constantly emerging to improve the surface properties of steel molds, they are mainly used in the manufacture of steel molds for nitriding, carburizing and hardening film deposition.
Nitriding processes include gas nitriding, ion nitriding, and liquid nitriding. In each type of nitriding, there are several nitriding technologies that can be adapted to the requirements of different steel types and different workpieces. Nitriding technology can form a surface with excellent performance, and the nitriding process is well coordinated with the quenching process of the mold steel. At the same time, the nitriding temperature does not require intense cooling after nitriding. Strengthening is the earlier use of nitriding technology and is also the most widely used.
The purpose of carburizing a steel mold is mainly to improve the overall toughness of the steel mold, that is, the working surface of the steel mold has high strength and wear resistance. The technical idea introduced thereby is to replace the higher-grade materials with lower-grade materials, that is, through carburizing and quenching, thereby reducing manufacturing costs.
At present, the hardened film deposition technology is more mature than CVD and PVD. In order to increase the bonding strength of the surface of the film layer workpiece, a variety of enhanced CVD, 'PVI) technologies have now been developed. The hardened film deposition technology was first applied to tools (knives, cutting tools, measuring tools, etc.) with excellent results. A variety of tools have adopted hardened film coating as a standard process. Since the 1980s, the mold has adopted the coating hardened film technology. Under the current technical conditions, the cost of hardened film deposition technology (mainly equipment) is relatively high, and it is still only applied to some precision, long-life molds. If a heat treatment center is established, the cost of hardened film coating will be greatly reduced. If more molds adopt this technology, it can improve the level of steel mold manufacturing in China as a whole.
The surface treatment technology of the steel mold is a system engineering that changes the morphology, chemical composition, microstructure and stress state of the surface of the steel mold through surface coating, surface modification or composite treatment technology to obtain the required surface properties. From the surface treatment methods, they can be divided into: chemical methods, physical methods, physical-chemical methods, and mechanical methods. Although new treatment technologies are constantly emerging to improve the surface properties of steel molds, they are mainly used in the manufacture of steel molds for nitriding, carburizing and hardening film deposition.
Nitriding processes include gas nitriding, ion nitriding, and liquid nitriding. In each type of nitriding, there are several nitriding technologies that can be adapted to the requirements of different steel types and different workpieces. Nitriding technology can form a surface with excellent performance, and the nitriding process is well coordinated with the quenching process of the mold steel. At the same time, the nitriding temperature does not require intense cooling after nitriding. Strengthening is the earlier use of nitriding technology and is also the most widely used.
The purpose of carburizing a steel mold is mainly to improve the overall toughness of the steel mold, that is, the working surface of the steel mold has high strength and wear resistance. The technical idea introduced thereby is to replace the higher-grade materials with lower-grade materials, that is, through carburizing and quenching, thereby reducing manufacturing costs.
At present, the hardened film deposition technology is more mature than CVD and PVD. In order to increase the bonding strength of the surface of the film layer workpiece, a variety of enhanced CVD, 'PVI) technologies have now been developed. The hardened film deposition technology was first applied to tools (knives, cutting tools, measuring tools, etc.) with excellent results. A variety of tools have adopted hardened film coating as a standard process. Since the 1980s, the mold has adopted the coating hardened film technology. Under the current technical conditions, the cost of hardened film deposition technology (mainly equipment) is relatively high, and it is still only applied to some precision, long-life molds. If a heat treatment center is established, the cost of hardened film coating will be greatly reduced. If more molds adopt this technology, it can improve the level of steel mold manufacturing in China as a whole.
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