Vacuum tempering furnace heating process
Vacuum tempering furnace is mainly suitable for tempering after quenching of various materials, and can also be used for recrystallization annealing and aging treatment of nonferrous metals. The furnace is composed of a host, a vacuum system, a heating system, a water cooling system, a pneumatic system, an electric control system, and an external transport vehicle.
Matters needing attention during the heating process of vacuum furnace:
1.to avoid heat treatment products, especially copper, aluminum, zinc, tin, lead, contact with electric heating elements, such as whether it is a fine powder, liquid or steam, etc., to prevent surface erosion in the electric heating body formation "ma pit", smaller cross section, and finally overheat and burn out.
2. When testing the uniformity of furnace temperature, it is necessary to pay attention to the positioning and binding mode of temperature contact points, as well as the distance from the heating element.
Box type resistance furnace furnace often (at least once a month), brooms with brush or compressed air, vacuum cleaners clean furnace and put aside brick, such as to prevent impurities such as furnace oxide skin off on the electric heating element, short-circuit, even burning brick. The bottom plate, crucible, furnace and other heat-resistant steel members are used for a period of time. If the impurities such as iron oxide are not removed in time, it will melt and react with the refractory brick to melt the furnace wire.
3. When the vacuum furnace is heated up, it cannot open the furnace door for a long time. When the temperature is above 400, it is not allowed to cool sharply. In the case of high temperature and hot and cold changes of electric heating elements, it is easy to oxidize the skin. For the molybdenum reheating furnace, the maintenance should be cooled to less than 200 to stop the protection gas.
4. The outlet rod and wire clip should be in good contact, and the outlet rod should be smooth with the clamp. The outlet rod should not be red, and the temperature of the wire clip should not exceed 60. It is noted that because of the thermal expansion and shrinkage and creep elongation of the heating stop furnace, the bolts of the rod connecting clamp are easy to be oxidized and loose, forming a hollow short circuit, which should be checked and tightened regularly.
Vacuum furnace automatic control of reasonable design, high degree of automation, good reliability, which can effectively ensure the production of efficient, safe, and give full play to the high reliability of PLC, anti-jamming, convenient debugging, automate the brazing process, so as to reduce the labor intensity of operators. At the same time, it solves the problem of long period and serious resource waste, and realizes saving time and energy saving, which has high economic and social benefits.