Advantages of multi-purpose furnace carburizing furnace

Advantages of multi-purpose furnace carburizing furnace

The surface of carbonizing furnace wall is oxidized and spalling, which can cause cracks and make the leakage of carburizing furnace cylinder become the main failure form. Casting defects seriously affect the service life of the furnace cylinder, often occur oxidation, and have more chances to crack. The wall of the furnace has a slight crack, which will be damaged quickly in a short time, mainly because of the deterioration of welding performance after oxidation treatment. Because its exterior is similar to the electric heating element, the temperature of the carburizing furnace is as high as 950 thousand degrees Celsius, and the inside of the furnace has good oxidation resistance, and the inside of the furnace is a carburizing atmosphere, which requires the carburizing furnace to have good anti-carburizing performance. At the same time, due to the large load of carburizing furnace, the high temperature strength of carburizing furnace is also required.

Before opening the furnace, pay attention to matters before the nitriding furnace is powered on. The cooling water circulation in the furnace body must be opened (the valve is horizontal and closed). The butterfly valve of the vacuum pump must be closed. Ammonia tanks, carbon dioxide tanks are closed. The anode quick connector is connected to the furnace body (green wire connector connected to the water cooling pipe). The black pulse controls the voltage knob on the disc, and the duty cycle knob is rotated to the left of the Z small. The yellow ammonia reversing valve handle is located in the center (top) position.

Annular cracks sometimes appear under the carburizing furnace, which is related to the structure of the carburizing furnace and the complex stress state in the area. Through the structure of multiple nitriding furnaces, it can be seen that the area causing ring cracking is the transition zone between the high temperature zone in the carburizing furnace tank and the low temperature zone at the upper tank mouth. Under the action of different temperatures in the upper, lower, and lower parts, the heat in this area is induced. The force is greater. In addition, compared with the sealing ring bottom of the carburizing furnace at the mouth of the carburizing furnace in this area, the life of the carburizing furnace of Cr18Ni25Si2.Cr25Ni20 steel is higher, and the life of the carburizing furnace is more than 3 times higher than that of Cr18Mn12Si2N steel.

The gas nitriding furnace before nitriding must be a work piece after normalizing or chemical treatment. First, scrub the surface of the gas nitriding furnace with gasoline and alcohol, and there can be no rust spots. Oil. Dirt is present. After loading into the furnace, press the furnace cap symmetrically against the bolts. The water inlet of the furnace tank and the furnace cover leads to the cooling water for circulating water cooling. The cooling water of the gasifier cover is water, the upper end is water, the tank is independent water, independent discharge, all the water pipes of the gas nitrogen furnace cover can be low into the principle of high series, by one mouth into the water, one mouth out.

Before heating the gas nitriding furnace, nitrogen exhaust should be sent first, and the discharge flow is more than twice that of the use. After 10 minutes of exhaust pipe, adjust the temperature controller to 150℃, turn on the automatic heating switch, heat the exhaust side of the gas nitriding furnace at 150℃ to maintain 2h exhaust 2h, then set the temperature controller to 530℃, and adjust the ammonia flow to 530℃. The pressure on the exhaust port is small, the air flow rises, the furnace temperature rises to 530℃, the constant temperature and constant flow nitriding 3-20h, and then the ammonia pressure is increased a little, so that the exhaust volume is kept under a moderate pressure, nitriding 4-70h, and then the ammonia pressure is lowered, 1-2h, cut off the power supply, give a small amount of ammonia gas, and maintain the positive pressure in the furnace.

Nitriding furnace can work normally at 520 degrees high temperature, nitriding furnace is stainless steel vacuum sealed tank, with high hardness, high wear resistance, its main characteristics are: 1, nitriding furnace processing time is short, the workpiece deformation is small. The nitriding furnace is not affected by the material and can handle stainless steel. Cast iron and iron-based powder are non-metallurgical materials. Carbon steel. Low alloy steel. Die steel. Nitriding furnace anti-friction, anti-corrosion. It has certain consolidation and is not easy to flake off. In recent years, on the basis of the nitriding furnace process, in order to shorten the nitriding cycle and make it not limited by the steel grade, two new processes, soft nitriding and ion nitriding, have been developed on the basis of the nitriding process. The hardness of nitriding reactor is lower than that of nitriding, and the hardness of nitriding layer is lower than that of nitriding, and the brittleness is less.