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Method for strengthening treatment of escalator sprocket wheel

An escalator and strengthening treatment technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of long treatment time and shallow infiltration layer, etc., to achieve short treatment time and increase surface wear resistance. Effect

Active Publication Date: 2011-11-23
HENGDA FUJI ELEVATOR
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Problems solved by technology

The penetration layer of this process is relatively shallow, and the processing time is too long, so it is not suitable for escalator sprocket

Method used

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  • Method for strengthening treatment of escalator sprocket wheel

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Embodiment Construction

[0008] Example. The escalator sprocket strengthening treatment method adopts a three-stage nitriding process, and the process is as follows:

[0009] Put the sprocket of the escalator to be treated in the nitriding furnace first, then feed ammonia gas to exhaust the air in the nitriding furnace, seal the nitriding furnace after the air is exhausted, and start heating. When the temperature is heated to 510°C, maintain this temperature for 5 hours; then raise the temperature to 550°C, and maintain this temperature for 15 hours; then slightly lower the temperature to 530°C, and maintain this temperature for 5 hours. Finally, turn on the heat exchanger to complete the furnace cooling stage. After cooling the nitriding furnace, exhaust the exhaust gas and take out the escalator sprocket.

[0010] Since ammonia gas decomposes at high temperature to generate active nitrogen atoms, the active nitrogen atoms will be adsorbed on the surface of the escalator sprocket and gradually penet...

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Abstract

The invention discloses a method for strengthening treatment of an escalator sprocket wheel, which adopts a three-step nitriding process. The method is characterized in that ammonia is used for nitriding an escalator sprocket wheel in a nitriding device under different temperatures through three stages, the temperatures adopted in the three stages are 505-515 DEG C, 545-555 DEG C and 525-535 DEG C in sequence. The invention adopts the three-step nitriding process and nitride the escalator sprocket wheel step by step under different temperatures and ammonia decomposition rates, thereby increasing the surface wear resistance, internal toughness and impact resistance of the escalator sprocket wheel. Moreover, a deeper infiltration layer can be obtained on the escalator sprocket wheel, and the treatment time is shorter.

Description

technical field [0001] The invention relates to a strengthening treatment method for an escalator sprocket, which belongs to the technical field of elevators. Background technique [0002] The escalator sprocket is an important transmission part of the escalator, so there are high requirements on the surface wear resistance, internal toughness and impact resistance of the escalator sprocket in the process. At present, in order to improve the wear resistance of metals, nitriding processes are mostly used, but none of them are applied to escalator sprockets. Moreover, in the ordinary nitriding process, the nitriding temperature and ammonia decomposition rate remain unchanged throughout the nitriding process. The temperature is generally between 480-520°C, the decomposition rate of ammonia gas is 15-30%, and the holding time is nearly 80 hours. This process has a relatively shallow permeation layer and takes too long to process, making it unsuitable for escalator sprockets. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/24
Inventor 钱江明刘万兵冼桂花
Owner HENGDA FUJI ELEVATOR
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