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Electromagnetic induction heating temperature control method

A temperature control method and electromagnetic induction heating technology, applied in the direction of induction heating control, induction heating, etc., can solve the problems of high temperature, high hardware platform resource requirements, and high difficulty in implementation, and achieve the effect of precise temperature control and flexible temperature control methods

Inactive Publication Date: 2020-01-14
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the heating system, especially for the heating of large workpieces, has the characteristics of large hysteresis and large inertia, it is difficult for the widely used traditional PID control algorithm to obtain a satisfactory control effect
However, the control algorithm based on neural network has high complexity, requires high hardware platform resources, and is difficult to implement.
[0004] The traditional PID algorithm has the disadvantages of large deviation between the heating temperature and the actual temperature during the heating and cooling process, large temperature overshoot after heating reaches the target temperature, and unstable control.

Method used

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Embodiment 1

[0062] In industrial applications such as pre-welding preheating, post-welding heat treatment, and crystal growth furnace heating, there is a need to heat up and cool down at a fixed rate, and to keep warm after reaching the target temperature, that is, the demand for the heating process temperature curve. Due to the thermal inertia of the heating system, the actual application effect of the traditional PID control algorithm is not ideal; on the other hand, algorithms such as neural networks are too complex to be practical for general control platforms.

[0063] The invention proposes an electromagnetic induction heating temperature control method to accurately realize heating according to the setting of the process curve.

[0064] The present invention adopts the following steps in the heating process control process:

[0065] Step 1: Thermal inertia estimation: To improve the effect of precise temperature control, thermal inertia estimation of the heated object is indispensa...

Embodiment 2

[0113] Next, take the 20KW medium frequency induction heating power supply as an example to illustrate. The workpiece to be heated has a diameter of 20cm and a thickness of 1cm, and the setting of the process curve is as shown in the table:

[0114] Table 1 process curve table

[0115] Process section number control mode target temperature Heating rate Holding time 1 heat up 400 degrees 950 degrees / hour 2 constant temperature 400 degrees 6 minutes 3 cool down 350 degrees 50 degrees / hour 4 constant temperature 350 degrees 21 minutes 5 cool down 300 degrees 100 degrees / hour 6 constant temperature 300 degrees 21 minutes 7 cool down 250 degrees 50 degrees / hour 8 constant temperature 250 degrees 21 minutes 9 heat up 300 degrees 300 degrees / hour 10 constant temperature 300 degrees 12 minutes 11 constant temperature 300 degrees 11 minute...

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Abstract

The invention relates to an electromagnetic induction heating temperature control method and belongs to the technical field of temperature control. The method includes the following steps of 1, thermal inertia estimation: to improve the effect of accurate temperature control, the thermal inertia estimation of a heated object is indispensable; it is impossible to quickly lock an appropriate balancepower value if no thermal inertia estimation heating system is provided; and in applications with low thermal inertia, a serious temperature fluctuation results during the early stage of heating; 2,power control and adjustment: based on the fact that the temperature is set in advance during a heating process based on a process curve, that is, the ideal temperature value at each moment is obtained by calculation; and 3, the temperature control of the process curve: the temperature increase and temperature decrease processes of the process curve are relatively independent, and a heat preservation stage is included in the temperature increase and temperature decrease processes. The electromagnetic induction heating temperature control method realizes accurate heating according to the process curve, accurate temperature control and a flexible temperature control modes, and is applied not to the electromagnetic induction heating mode, but also to any system that performs heating accordingto the process curve.

Description

technical field [0001] The invention relates to an electromagnetic induction heating temperature control method, which belongs to the technical field of temperature control. Background technique [0002] In the industry, welding of important components, special materials, and special parts requires preheating of the workpiece; in order to reduce or eliminate the residual stress of the welded joint, prevent cracks, improve the structure and performance of the weld and the metal in the heat-affected zone, welding Appropriate heat treatment is then carried out. As a new heating method, electromagnetic induction heating has the characteristics of environmental protection, safety and high efficiency, and gradually replaces the traditional ceramic heating method. Electromagnetic induction heating can also be used for temperature control of crystal growth furnaces. [0003] In the above application occasions, it is often necessary to achieve temperature rise at a certain rate, he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06
CPCH05B6/06
Inventor 刘进志林凯恩张阳李莺歌
Owner QINGDAO UNIV OF SCI & TECH