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Method for incremental heat treatment of escalator chain plate

A heat treatment method and escalator technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of reducing the toughness of workpieces, cracking of workpieces, and large internal stress of workpieces, and achieve the goal of enhancing strength, eliminating internal stress, and improving toughness Effect

Active Publication Date: 2010-07-14
HENGDA FUJI ELEVATOR
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AI Technical Summary

Problems solved by technology

This quenching process will cause a large internal stress inside the workpiece, which will cause the workpiece to break, etc., and will reduce the toughness of the workpiece, so it is not suitable for processing the escalator chain plate

Method used

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Examples

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Effect test

Embodiment Construction

[0008] Example. Progressive heat treatment method for escalator chain plate, the process is as follows:

[0009] First put the escalator chain plate to be treated in the heat treatment mesh belt furnace, and feed methanol gas when it is heated to 760°C. First send the escalator chain plate to the temperature zone of 810℃ and keep it for 1 hour; then send it to the temperature zone of 820℃ and keep it for 1 hour; then send it to the temperature zone of 830℃ and keep it for 1 hour; finally send it to 840℃ , and maintain for 1 hour. Then perform quenching treatment, and then clean the escalator chain plate at 20-40°C. After the cleaning is completed, raise the furnace temperature of the heat treatment mesh belt furnace to 155°C, keep it for 3 hours, and then cool it naturally to complete the annealing process.

[0010] Since methanol gas will be decomposed into carbon monoxide and hydrogen at high temperature, it can protect the escalator chain plate from oxidation. The inven...

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Abstract

The invention relates to a method for incremental heat treatment of an escalator chain plate, which is characterized by comprising the following steps: forming four different temperature zones with a mesh belt type furnace for heat treatment in the atmosphere of methanol gas for incremental increase of the quenching temperature of an escalator chain plate, and annealing at the temperature of 155 DEG C plus or minus 5 DEG C for 2.9-3.1 hours after quenching, wherein four different temperatures are 810 DEG C plus or minus 5 DEG C, 820 DEG C plus or minus 5 DEG C, 830 DEG C plus or minus 5 DEG C and 840 DEG C plus or minus 5 DEG C in sequence. Since the mesh belt type furnace for heat treatment is used for forming the four different temperature zones so as to incrementally increasing the quenching temperature of the escalator chain plate, the invention enhances the strength of the escalator chain plate on the premise that no high internal stress is generated. Moreover, the invention adopts annealing after quenching, thereby eliminating the internal stress generated during quenching and improving the toughness of the escalator chain plate.

Description

technical field [0001] The invention relates to a heat treatment method for an escalator chain plate, which belongs to the technical field of elevators. Background technique [0002] The escalator chain plate is an important transmission part of the escalator, so there are high requirements on the strength and toughness of the escalator chain plate in the process. At present, in order to improve the strength of metal, heat treatment process is mostly used, but it has not been applied to escalator chain plate. Moreover, the common heat treatment process is to directly heat the workpiece to a quenching temperature, and maintain this temperature for a period of time before quenching. This quenching process will cause a large internal stress inside the workpiece, resulting in cracking of the workpiece, etc., and will reduce the toughness of the workpiece, so it is not suitable for processing the escalator chain plate. Utility model content [0003] The object of the present ...

Claims

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Application Information

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IPC IPC(8): C21D9/00
Inventor 钱振华施卫玉曹丽莉
Owner HENGDA FUJI ELEVATOR
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