Three stages vacuum furnace oven
① water discharge of O ~ 200 ℃, the vacuum furnace insulation and vacuum in the water discharged from the furnace of moisture must be checked vacuum furnace vacuum, while a longer holding time.
② large vacuum furnace discharge gas temperature zones is generally about 500 ℃, due to the relatively large amount of gas in a vacuum oven, then heat up no more than 50 ℃ / h. Incubation time is generally 60 minutes or more
③ incubation period of about 1200 ℃, heating increased by 100 ~ 200 ℃, to be holding for some time, heating too easily damaged insulation, vacuum furnace deflation is incomplete.
Prepared vacuum furnace vacuum furnace maintenance procedures, establishing a vacuum furnace operating records and repair records, statistics run cumulative operation time, a strong vacuum furnace maintenance, technical state control equipment trends, early detection of signs of malfunction damage, avoid belong accident repair nature maintenance, and the vacuum furnace workload and health, targeted to prepare in advance vacuum furnace repair parts, prepared vacuum furnace operation and maintenance program. Many factors, such as a vacuum furnace and the length of life of the heating element temperature, vacuum furnace product media, the number of products and operating conditions, respectively, and in the case of processing of 24 hours per day, a vacuum heating furnace and the heat shield element replacement approximately once every two or three years. It depends on the type and frequency of brazing work.
Usually in spring and autumn vacuum furnace leak more failures, long idle times vacuum furnace at a vacuum furnace was relatively prone to leakage failure. This time it must be vacuum leak detection, vacuum leak detection in general, once a month Pressure rising rate (at room temperature, turn off all the vacuum valve and stop the vacuum system operation, after reading a few 1Omin, 1h after reading a number two is the numerical difference between the number of the pressure rise rate), the master device trends leak, such as a vacuum device continuously shut down for a week, to idling once (were oven).
Note the use of a vacuum furnace include:
1 piece - piece shall be washed and dried car rear grams into the furnace, prevent moisture, dirt into the furnace.
2, each transmission parts Discover Card, limit allowed, out of control and so on, should be immediately removed, do not force it to avoid damaging parts.
3, strictly follow the rules operate, not allowed to freely tilt switch, informal operators Never operate.