High-temperature bearing steel ring high-pressure gas quenching device and high-pressure gas quenching process

Abstract

The invention belongs to the technical field of high-pressure gas quenching furnaces, and particularly relates to a high-temperature bearing steel ring high-pressure gas quenching device and a high-pressure gas quenching process. The high-temperature bearing steel ring high-pressure gas quenching device comprises a heater, a vacuum pump, a furnace door, a furnace body and a nozzle, and further comprises a chassis, a fixing block, blocking blocks, a rotating shaft and a motor, wherein the chassis is fixedly arranged on the surface of the bottom of the furnace body, the fixing block is fixedly connected with the rotating shaft, and the blocking blocks are uniformly and fixedly connected to the rotating shaft. According to the high-temperature bearing steel ring high-pressure gas quenching device and the high-pressure gas quenching process, the fixing block is arranged on the chassis and is fixedly connected with an output shaft of the motor, and then the rotating shaft is fixedly arranged on the fixing block, so that bearing steel rings rotate on the chassis and are uniformly cooled, meanwhile, the two bearing steel rings are prevented from being in contact with each other, the purpose of influencing cooling is achieved, then the whole bearing steel rings can be in contact with inert gas, and the cooling efficiency and the cooling effect of the high-pressure gas quenching device are improved.

Description

technical field [0001] The invention belongs to the technical field of high-pressure gas quenching furnaces, in particular to a high-pressure gas quenching device and a high-pressure gas quenching process for high-temperature bearing steel ferrules. Background technique [0002] High-pressure gas quenching is mainly used to strengthen the surface of some metal equipment, and is widely used in aviation and other fine technologies; gas quenching in vacuum means that the workpiece is heated in vacuum and then filled with high-purity neutral gas in the cooling chamber for cooling; applicable Materials suitable for gas quenching include high-speed steel, high-carbon and high-chromium steel and other materials with a low critical cooling rate of martensite; high-pressure gas-quenching vacuum furnaces use graphite heaters, but there are certain defects in high-pressure gas-quenching vacuum furnaces: the current domestic high-pressure gas-quenching vacuum furnace The deformation of ...

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Problems solved by technology

[0002] High-pressure gas quenching is mainly used to strengthen the surface of some metal equipment, and is widely used in aviation and other fine technologies; gas quenching in vacuum means that the workpiece is heated in vacuum and then filled with high-purity neutral gas in the cooling chamber for cooling; applicable Materials suitable for gas quenching include high-speed steel, high-carbon and high-chromium steel and other materials with a low critical cooling rate of martensite; high-pressure gas-quenching vacuum furnaces use graphite heaters, but there are certain defects in high-pressure gas-quenching vacuum furnaces: the current domestic high-pressure gas-quenching vacuum furnace The deformation of quenched workpieces is generally relatively large. The reason is that the hearth shape of a typical domestic vacuum high-pressure gas quenching furnace is a circular hearth, and quenching cooling nozzles are evenly arranged around the hearth, hoping to obtain a uniform air flow field; in fact, the furnace with this structure The uniformity of the cooling airflow is very poor, the airflow velocity near the end faces of the front and rear furnace chambers is very low, and the cooling capacity is poor, and the cooling velocity at one end near the furnace door is faster than that at the other end; within the effective size range of the charge, the cooling airflow velocity is also Low, the gas flow rate on the cylindrical surface facing the nozzle is high, and the cooling capacity between two adjacent nozzles is very low, and the spray cooling traces of the workpiece facing the nozzle are obvious; workpieces of the same furnace type are in different positions The cooling difference on the surface is very large; the workpiece is quenched unevenly by the gas quenching, resulting in a large quenching deformation of the workpiece, and the tempering resistance of the workpiece is inconsistent

[0003] For example, a Chinese patent with the application number CN201611052406.X discloses a high-pressure gas quenching furnace, the technical solution relates to a high-pressure gas quenching furnace, and relates to the field of quenching equipment; the gas quenching chamber of the high-pressure gas quenching furnace described in the technical solution It is a spherical cavity formed by the shell, and the gas quenching chamber is provided with several nozzles for passing gas medium into the gas quenching chamber, and the nozzles are evenly distributed along the circumferential direction in the gas quenching chamber of the spherical cavity. A workpiece rack is placed nearby, so that the gas medium entering the gas quenching chamber can contact the workpiece to be processed at the highest flow rate and highest pressure, so that the gas medium can exert the maximum gas quenching effect, shorten the gas quenching time, and reduce energy consumption. Purpose; at the same time, the main workpiece holder is set in the center of the spherical cavity, which can be used to process larger volume workpieces; when using the main workpiece holder, the agitator at the bottom can be opened to optimize the gas flow rate; but the problems in this technical solution are also Obviously: the contact surface of the workpiece and the workpiece holder cannot effectively contact the inert gas, which makes the cooling effect of this part poor, resulting in a large quenching deformation of the workpiece and inconsistent tempering resistance of the workpiece

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