Gear ring nitrogen protection continuous type normalizing process

A nitrogen protection and process technology, used in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of oxide layer on the surface of tooth blanks, oxidative decarburization, etc., achieve good manufacturability and mechanical performance indicators, reduce pollution, and inhibit oxidation. The effect of decarbonization

Inactive Publication Date: 2010-07-14
青岛奔达汽车配件有限公司
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that oxidative decarburization is easy to occur in the existing ring gear normalizing pro

Method used

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Embodiment Construction

[0013] The invention is mainly used for the normalizing process of the medium carbon steel used for the ring gear. The process is carried out on the production line of the continuous normalizing furnace protected by nitrogen gas. During the whole heating and heat preservation process of the normalizing furnace, high-purity nitrogen gas is introduced into the furnace. , to achieve the purpose of isolating the outside air and evacuating the oxygen in the furnace, inhibiting the oxidative decarburization process on the surface of the material, and before the workpiece is released from the furnace, the high-pressure and low-temperature nitrogen at the outlet is used to rapidly cool the material to below 550 ° C within 10 minutes. It is conducive to the refinement and improvement of the internal structure of the material, and obtains good manufacturability and mechanical performance indicators.

[0014] The above-mentioned ring gear nitrogen protection continuous normalizing process...

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Abstract

The invention relates to a normalizing process, in particular to a normalizing process under nitrogen protection atmosphere for a gear ring, which avoids the phenomena of easy oxidation and decarbonization in the traditional gear ring normalizing process, overcomes the defect of oxidation layers on gear blank surfaces and provides a gear ring nitrogen protection continuous type normalizing process. In the heating and insulating processes of normalizing heat treatment, high-purity nitrogen is led into a hearth so as to achieve the purposes of spacing and emptying oxygen in the hearth; oxidation and decarbonization on the surface of a material are suppressed, and before a workpiece is taken out of the furnace, quick cooling is carried out by utilizing a nitrogen cooling area at an outlet so as to be beneficial to fining and perfecting inner tissues of the material and obtaining good manufacturability and mechanical property indexes. In addition, the process omits the processes of water cooling and isothermy, realizes continuous production, effectively shortens the normalizing time, improves the production efficiency and realizes energy saving and emission reduction.

Description

technical field [0001] The invention relates to a normalizing process, in particular to a normalizing process under a nitrogen protective atmosphere for ring gears. Background technique [0002] According to the definitions of GB7232 and GB / T16923, the normalizing of steel is usually to heat the steel to the critical temperature Ac3 or above the Accm line, keep it warm for a period of time, and then carry out air cooling. Due to the faster cooling rate, compared with the annealed structure, the amount of pearlite in the structure is relatively large, and the sheets are finer, so the performance is improved, the grains are refined, the structure is improved, and the residual stress is eliminated. For low-carbon steel, increasing the hardness after normalizing can improve machinability and surface finish of parts; for high-carbon steel, normalizing can eliminate reticular cementite and make a good structure for the next step of spheroidizing annealing and quenching Prepare. ...

Claims

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Application Information

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IPC IPC(8): C21D9/32C21D1/28
Inventor 八代行雄郑光源刘永江
Owner 青岛奔达汽车配件有限公司
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