Vacuum furnace heat treatment of operational processes

Vacuum furnace heat treatment of operational processes

1. workpieces in a vacuum hardening, you should use a vacuum quenching furnace oil, this oil has a lower saturation vapor pressure.
2. Vacuum furnace maintenance should charge under vacuum or nitrogen status, avoid breathing normally when not absorb moisture.
3. Domestic vacuum furnace pressure rise rate should not exceed 1.33Pa / h, certain standards for foreign companies 0.67Pa / h
4. Vacuum furnace should have fast-cooling device. Cooling water pressure should be greater than 0.2Mpa, traffic should be adjustable.
5. processing titanium, should not use nitrogen as the cooling gas, because titanium and nitrogen at high temperatures, to form titanium nitride gold.
6. The cooling gas: steel commonly used 99.995% purity nitrogen, high temperature alloys using 99.999% nitrogen or argon, titanium using 99.995% argon.
7. The vacuum heating to radiation main piece in the furnace should be kept spacing.
8. The heating process, the workpiece material and the furnace will deflate the vacuum decreased.
9. warming: After you insert the workpiece, usually before the first pre-heating heat pumping to 6.67Pa
10. The heating temperature vacuum annealing furnace, vacuum annealing, vacuum and vacuum aging solution treatment temperature is generally the same as conventional treatment and heating.