Gas nitriding furnace has the characteristics of low temperature, short time, small deformation of the workpiece, properties: high fatigue limit and good wear resistance.
1. The gas nitriding furnace prior to nitriding must be a normalizing or tempering treatment of the workpiece.
2. First use gasoline and alcohol to scrub the surface of the workpiece in the gas nitriding furnace, not rust spots, oil stains, dirty presence.
3. After loading into the furnace, tighten the pressing bolts of the furnace cover symmetrically.
4. Circulate the cooling water through the inlet of the furnace tank and the furnace cover. The lower end of the cooling water in the pipeline on the cover of the gas nitrification furnace is inlet water, while the upper end is outlet water. Inlet water is fed into the furnace tank separately and discharged separately. All water pipes in the cover of the gas nitrification furnace can be connected in series according to the principle of low inlet and high, with one inlet and one outlet discharging.
5 gas nitriding furnace before the temperature should be sent to exhaust nitrogen, exhaust flow should be more than twice the use.
Exhaust after 10 minutes, to set the temperature control meter to 150 ℃, automatic heating switch to open, exhaust gas nitriding fireside and heated to 150 ℃ for 2 h and exhaust, and then to set the temperature control meter to 530 ℃, the ammonia flow down, maintain positive pressure in the furnace, vent has smaller flow upward pressure, when the temperature rises to 530 ℃, constant temperature constant current nitriding 3-20 h, then up the ammonia pressure, keeping the exhaust moderate pressure, nitriding 4-70 - h, then ammonia pressure down, back n 1 to 2 h, cut off power supply, give a small amount of ammonia, maintain positive pressure in the furnace, Ammonia supply can be stopped until the furnace temperature drops below 150℃.
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