Isothermal spheroidizing annealing furnace for bearing steels

Abstract

The invention discloses an isothermal spheroidizing annealing furnace for bearing steels, which can be used for treating the bearing steels in a mode of double layers and double directions. Length ratio of a waste heat recovery heat-exchanging chamber to an isothermal chamber to an intercooling chamber to a heating preservation chamber in a hearth is 1:(2-5):(0.2-0.5):(2-5) along with the front and rear directions, thus annealing treatment effect of the bearing steels in double layers and double directions can be ensured. In the waste heat recovery heat-exchanging chamber, if one layer of driving roller group in the upper and lower layers of driving roller groups is used for conveying high-temperature bearing steels to be sent out of a furnace mouth, and the other layer of driving roller group is used for conveying room-temperature bearing steels (called cold metals) which are input into a furnace mouth, the high-temperature bearing steels and the room-temperature bearing steels can exchange the heat mutually, thus the room-temperature bearing steels are heated so as to recover heat (to be wasted) of the high-temperature bearing steels, reduce subsequent heat which enters into the isothermal chamber, and reach energy-saving effect. In the intercooling chamber, a cooler can be used for cooling the high-temperature bearing steels which are sent out of the heating preservation chamber, while the high-temperature bearing steels and the room-temperature bearing steels on the upper and lower layers of driving roller groups exchange heat mutually, thus recovering the heat of the high-temperature bearing steels, heating the low-temperature bearing steels, reducing the subsequent heat which enters into the heating preservation chamber and is required by the low-temperature bearing steels, further saving energy, and lowering the waste of the heat.

Description

technical field [0001] The invention relates to an isothermal spheroidizing annealing furnace for bearing steel. Background technique [0002] In the existing isothermal spheroidizing annealing furnace for bearing steel, a single-layer drive roller group for conveying the bearing steel is arranged in the furnace. The isothermal spheroidizing annealing process, the annealed bearing steel usually reaches 550°C, and after being output from the furnace, it needs to be cooled. Below 550°C, the spheroidizing annealing structure of the bearing steel material will not be affected, but the bearing steel is still With a large heat capacity, a large amount of heat energy will be wasted with the cooling of the material, which not only wastes heat energy, but also pollutes the environment. Contents of the invention [0003] The object of the present invention is to provide a double-layer bidirectional isothermal spheroidizing annealing furnace for bearing steel. The annealing furnace ...

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Problems solved by technology

[0002]In the existing isothermal spheroidizing annealing furnace for bearing steel, a single-layer drive roller set for conveying the bearing steel is arranged in the furnace, and the bearing steel is on the drive roller, which is sequentially After heating, heat preservation, air cooling, isothermal, and slow cooling, the isothermal spheroidizing annealing process of bearing steel is completed. The annealed bearing steel usually reaches 550 ° C. After being output from the furnace, it needs to be cooled. Below 550 ° C, it will no longer be It has an impact on the spheroidizing annealing structure of the bearing steel material, but the bearing steel still has a large heat capacity, and a large amount of heat energy will be wasted with the cooling of the material, which not only wastes heat energy, but also pollutes the environment

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