Temperature control method of high frequency heating

Abstract

The invention relates to a temperature control method adopting high-frequency heating. According to actual production conditions and the self characteristics of intermediate and high-frequency equipment, the problem of incapability of precise control of a temperature control and time control method over the heating temperature is solved. According to the temperature control method, the advantages of two temperature control methods are combined, the defects of the two temperature control methods are avoided to the maximum, the temperature control accuracy of a production process is greatly increased, and conditions are provided for the realization of high-standard products.

Description

technical field [0001] The invention relates to a heating control method for thin-walled workpieces during welding, in particular to a temperature control method for high-frequency heating. Background technique [0002] As an emerging heating method, high-frequency heating has the advantages of energy saving, flexible heating, and convenient operation. In the fields of smelting, forging, hot drawing, hot charging, welding, heat treatment and other fields in the metal manufacturing industry, high-frequency heating is gradually used to replace traditional heating methods. Especially in heat treatment, different materials have different optimal quenching temperatures, increasing the control accuracy between the actual quenching temperature and the target quenching temperature has become the most critical indicator to measure the quality of the equipment. [0003] At present, the temperature control method of domestic medium and high frequency heating equipment basically adopts...

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Problems solved by technology

These influencing factors will cause the error between the actual quenching temperature and the target quenching temperature during heating caused by the time signal control of the same batch of products

[0005] Factors affecting the temperature signal control: the accuracy of the temperature control instrument itself, temperature measurement error; smoke, water mist, temperature probe cleanliness; optical fiber signal transmission error cannot accurately control the heating temperature

These influencing factors will cause the error between the actual quenching temperature and the target quenching temperature during heating caused by the temperature signal control of the same batch of products

[0006] Generally speaking, the actual quenching temperature of heat treatment is required to fluctuate within the target quenching temperature ±10°C, while in the traditional time signal control method, the actual quenching temperature often fluctuates within the target quenching temperature ±20°C, exceeding ±10°C Fluctuations in the °C range can cause waste and defective products

Moreover, due to factors such as input voltage, ambient temperature, workpiece size tolerance, and sensors, the actual quenching temperature may have a greater fluctuation range

Although the influence of input voltage, ambient temperature, workpiece size tolerance, sensor and other factors can be partially eliminated through temperature signal control, the error of the temperature measurement system itself, the cleanliness of the probe, ambient water vapor, smoke, etc. will also affect the temperature measurement. The accuracy has a great impact, which can easily cause a large discrepancy between the temperature measured by the temperature measurement system and the actual temperature of the workpiece

Therefore, when heat-treating materials with high accuracy requirements between the actual quenching temperature and the target quenching temperature, the traditional temperature control method cannot meet the processing quality requirements.

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