Zhengzhou Lijia adopts the method of supersonic spraying tungsten carbide for corrugated rollers, which meets the high requirements of today’s market and is also the most environmentally friendly way. At present, most manufacturers use the traditional medium frequency quenching after nitriding or chromium plating, nitriding layer thickness of 0.5 ~ 0.6㎜, chrome plating layer thickness of 0.10 ~ 0.15㎜. In order to meet this requirement, most of the manufacturers’ materials are 42CrMo and 48CrMo forgings to meet their hardenability and hardenability. The service life of compound treatment roller is 8 ~ 9 million running meters. In order to win the leading position in the market, manufacturers have tried new steel in the material, the use of new technology in the process, the formation of intermediate frequency quenching after chrome plating, laser quenching after chrome plating and intermediate frequency quenching after spraying tungsten carbide three mainstream process competition, and advance the situation, provides a variety of options for carton manufacturers.
Three processes after the flow
(1) → grinding → medium frequency quenching → stress removal → sandblasting → chrome plating (thickness 0.10 ~ 0.15㎜) – life of 8 ~ 9 million running meters;
(2) → grinding → laser quenching → sandblasting → chrome plating (thickness 0.05 ~ 0.10㎜) – life 13 ~ 15 million running meters.
(3) → grinding tooth → (medium frequency quenching) → sandblasting → preheating → base → spraying tungsten carbide (thickness 0.05 ~ 0.06㎜) → polishing – life 20 ~ 50 million running meters;
To sum up: chromium plating method because of great pollution, the state will gradually ban, supersonic spraying of tungsten carbide method is the best way at present, on the one hand, the longest coating life, second, very environmental protection, no pollution to the environment, is a new way vigorously promoted by the state.
