What are the precautions for the use of vacuum tempering furnace

1. Should avoid heat treatment products, especially copper, aluminum, zinc, tin, lead, etc., from contacting electric heating elements, whether it is fine powder, molten liquid or steam, etc., to prevent corrosion and formation of “pits” on the surface of the electric heating body. It becomes smaller, and finally overheats and burns out.

2. When testing the furnace temperature uniformity, attention should be paid to the positioning and binding method of the temperature measuring contact and the distance from the heating element.

In box-type resistance furnaces, brushes, brooms, compressed air, vacuum cleaners, etc. are often used (at least monthly) to clean the furnace and the bricks. It is necessary to prevent impurities such as oxide scale in the furnace from falling on the heating elements, short-circuiting, or even burning out. brick. The bottom plate, crucible, furnace pot and other heat-resistant steel components should be lifted and knocked every time they are used for a period of time to remove their oxide scale. If impurities such as iron oxide scale are not removed in time, they will melt and react with the refractory bricks, causing the furnace wire to melt.

3. After the vacuum furnace heats up, the furnace door cannot be opened for a long time. When the temperature is higher than 400℃, it should not be cooled rapidly. For electric heating elements, under high temperature and large changes in cold and heat, it is easy to cause oxidation and peeling. For molybdenum heating furnaces, EI should be cooled to below 200 ℃ during frequent maintenance before stopping the protection gas.

4. The lead rod should be in good contact with the wire clamp, and the lead rod should be smooth in contact with the clamp. The lead rod must not have redness, and the temperature of the wire clip during power supply does not exceed 60°C. Note that due to thermal expansion, contraction and creep elongation during heating and shutdown, the bolts of the lead wire clamp are prone to oxidation and loosening, forming a virtual short circuit. Regular inspection and tightening are required.

The automatic control design of the vacuum furnace is reasonable, the degree of automation is high, and the reliability is good. It can effectively ensure the efficient and safe production of the vacuum furnace. It gives full play to the PLC’s high reliability, anti-interference, and convenient debugging characteristics, and realizes the brazing process. The automation of the process reduces the labor intensity of the operators. At the same time, it solves the problems of long construction period and serious waste of resources of single-chamber furnace, realizes saving construction period and energy saving, and has high economic and social benefits.

SIMUWU Vacuum Technology offers high end vacuum heat treatment equipments such as vacuum tempering furnaces, annealing vacuum furnace, qunch furnace and also QPQ salt bath nitriding furnaces. etc.