Well type air seep carbon stove and improvement of process thereof

Abstract

The invention discloses a well type air seep carbon stove and improvement of process thereof. The invention is characterized in that a traditional well type air seep carbon stove is improved; a wind shield is arranged on a charging basket; and the distance between the wind shield and a fan is increased. When a carburizing agent composed of kerosene and methanol is used for carburizing workpieces made from material of 20 Cr or 20 CrMnTi, the carburizing process includes carburizing period and diffusion stage, the temperatures of which respectively are 930 DEG C plus or minus 10 DEG C, 900 DEG C plus or minus 10 DEG C. During the carburizing period, the carburizing agent is added with kerosene of 10.3 ml / m / min plus or minus 0.2 ml / m / min, and methanol of 3.4 ml / m / min plus or minus 0.2 ml / m / min; and the carbon potential in the stove is 1.05 percent plus or minus 0.05 percent. During the diffusion stage, kerosene is of 8.0 ml / m / min plus or minus 0.2 ml / m / min, methanol is of 4.6 ml / m / min plus or minus 0.2 ml / m / min, and the carbon potential in the stove is 0.95 percent plus or minus 0.05 percent; and the pressure in the stove during the carburizing period ranges from 1.0 kPa to 1.5 kPa. By using the traditional well type air seep carbon stove, the invention has the advantages of enhancing carburization speed, saving carburization time, improving product quality, and adequately decomposing and absorbing the carburizing agent, and hardly producing carbon soot in the stove during the whole carburizing period, with the best effect when carburized depth ranges from 0.9 mm to 1.25 mm.

Description

technical field [0001] The invention relates to an improvement of a well-type gas carburizing furnace, including the improvement of the carburizing tooling used in the well-type gas carburizing furnace and the improvement of the process. Background technique [0002] The traditional well-type gas carburizing furnace was the main carburizing equipment used in the 1960s and 1970s. Although there are many new equipment such as continuous carburizing furnaces, multi-purpose furnaces, and vacuum carburizing furnaces, the well-type carburizing furnace is in the Factories are still widely used. It includes a temperature control device and a furnace body with heating elements. A furnace tank is arranged in the furnace body. There is a furnace cover on the upper part of the furnace tank. A motor is installed on the furnace cover. It is covered and sealed on the furnace tank, and the fan rotates in the furnace tank to stir the atmosphere in the furnace and force the atmosphere in the...

AI Technical Summary

Problems solved by technology

[0008] Focusing on the phenomenon of long carburizing cycle time and low production efficiency, people have carried out extensive research for a long time, and proposed many methods to increase the carburizing speed, such as: increasing the carbon potential in the furnace, increasing the carburizing temperature, and increasing the carburizing agent. Infiltration agent, increase furnace pressure and other methods

For the traditional well-type carburizing furnace, the effect of these methods of increasing the carburizing speed of the workpiece is not very obvious due to the uneven atmosphere in the furnace.

[0009] Due to the uneven atmosphere in the furnace, the active carbon atoms in the part with high active atmosphere cannot be completely absorbed by the workpiece, and the active carbon atoms in the part with high carbon concentration will partially form carbon black to cover the surface of the workpiece, which seriously hinders the absorption of activated carbon atoms by the workpiece. As a result, the carburizing speed is affected, the carburizing cycle time is prolonged, the production efficiency is low, and electric energy is wasted; some activated carbon atoms are discharged out of the furnace with the exhaust gas, resulting in waste of the carburizing agent

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