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Method for correcting heat preservation time of box type heat treatment heating furnace

A technology of heat preservation time and heat preservation start time, which is applied in the field of heat treatment, can solve problems such as short normalizing heat preservation time, and achieve the effect of precise control

Inactive Publication Date: 2016-12-07
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problem in the prior art that when workpieces are heat-treated in a box-type heat treatment furnace, due to the difference between the start time of heat preservation and the start time of uniform temperature, the heat preservation time of normalizing may be shorter than the process requirement. The characteristics of the furnace, considering the uniform temperature time, correct the holding time of the workpiece in the heat treatment furnace

Method used

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  • Method for correcting heat preservation time of box type heat treatment heating furnace
  • Method for correcting heat preservation time of box type heat treatment heating furnace
  • Method for correcting heat preservation time of box type heat treatment heating furnace

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Embodiment 1

[0024] This embodiment provides a method for correcting the holding time of a box-type heat treatment furnace, which includes the following steps:

[0025] (1) Arrange a certain number of temperature measuring thermocouples in the effective heating zone of the box-type heat treatment furnace (the model of RT3-750-12 produced by Wuhan Jiahua Furnace Industry Co., Ltd.);

[0026] (2) During the heating process, when the temperature meter of the box-type heat treatment furnace shows the set temperature, record this time as the start time of heat preservation, and measure the temperature measuring thermocouple arranged in the heating furnace at intervals thereafter When the temperature of each temperature measuring thermocouple is within the allowable deviation range from the set temperature (for example, the accuracy of Class III heat treatment is ±10°C), record this time as the start time of uniform temperature, and compare the start time of uniform temperature with The time dif...

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Abstract

The invention provides a method for correcting heat preservation time of a box type heat treatment heating furnace. The method comprises the following steps that firstly, a certain number of temperature measuring thermocouples are arranged in an effective heating area of the box type heat treatment heating furnace; secondly, in the temperature rise process, when a temperature instrument of the box type heat treatment heating furnace displays the set temperature, the time is recorded as the heat preservation start time, then the temperature of the temperature measuring thermocouples arranged in the heating furnace is measured at certain time intervals, and when the temperature of the temperature measuring thermocouples and the set temperature are in the allowed deviation range, the time is recorded as the equal temperature start time, and the time difference between the equal temperature start time and the heat preservation start time is recorded as delta t; and thirdly, the actually-executed heat treatment time of the heat treatment technology is the sum of the heat treatment time assessed by the heat treatment technology and delta t.

Description

technical field [0001] The invention relates to a method for correcting the holding time of a box-type heat treatment heating furnace, belonging to the technical field of heat treatment. Background technique [0002] Box-type heat treatment furnaces are widely used in industrial production, and are mainly used for heating workpieces during normalizing, quenching, annealing and tempering. Due to the relatively large volume of the box-type heat treatment furnace, and the influence of the arrangement position of the temperature measuring thermocouple and the heating method, the temperature uniformity in the furnace is poor, resulting in the actual holding temperature and holding time during the heating process. The temperature and time vary. [0003] When heating the box-type heat treatment furnace, the heating target holding temperature needs to be set in advance. When the temperature reaches the target holding temperature, the heating power is adjusted by the PID of the temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D1/28
CPCC21D11/00C21D1/28
Inventor 赵强徐亚楠曹佳丽
Owner STATE GRID CORP OF CHINA
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