The quality of the mold surface has a great influence on the service life of the mold and the appearance quality of the workpiece. Therefore, before the mold is used, it is also the final stage of mold manufacturing, usually grinding and polishing to improve the surface quality of the mold. After grinding and polishing, many mold manufacturers and mold companies also use surface treatment technology to extend the service life of the mold, improve the processing quality of the workpiece, reduce the cost of mold use, and improve production efficiency.
At present, there are many kinds of surface treatment technologies on the market, and the surface coatings are also various. We select three representative coatings according to the history of surface treatment technology, and compare them as follows:
Titanium nitride film diamond-like film amorphous diamond film
TiNDLCta-C
Technical history 40 years 20 years 5 years
Hardness HV24002000～60007000～8500
Film formation technology chemical vapor deposition chemical vapor deposition filter cathode vacuum arc
Film formation temperature 500 ° C 500 ° C less than 80 ° C
The thickness of the film layer ranges from 1 to 7 um 0.5 to 4 um 0.002 to 2 um.
Surface friction coefficient 0.550.150.08
Low membrane bond strength
Working environment maximum temperature 600 ° C 400 ~ 600 ° C 600 ° C
Corrosion resistance is better and better
Good decoration, good general
Lower price, higher and higher
Important parameter description:
1. The film formation temperature will affect the quality of the original steel, and the higher temperature will cause the steel to anneal or temper, reducing the hardness and toughness of the substrate.
2. Film formation technology determines whether the film layer is easy to fall off. Generally, the newer technology uses ion implantation to embed the film layer on the surface of the substrate, thereby improving the film-based bonding force.
3. The hardness of the film determines the wear resistance of the plated parts.
4. The surface layer has a low coefficient of friction, which is beneficial to the lubrication of the surface of the workpiece and is also a factor for improving the wear resistance.
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