Control method for heating weathering steel gear

Abstract

The invention relates to a control method for heating a weathering steel gear, and belongs to the technical field of gear production. The technique uses the characteristic that different frequency currents have different penetration depths to divide the teeth of the gear to be heated into three different heating areas, and uses three single-frequency power supplies to synchronously switch on current of three different frequencies, which are respectively high, medium and medium frequencies, to a circular coil, so as to heat the operation parts including the tooth top, tooth side and tooth rootof the gear to be heated. Meanwhile, the temperature monitoring of the tooth top, tooth side and tooth root is carried out in real time, the temperature difference of the respective parts is calculated, and the power supply heating power regulation corresponding to the respective parts is carried out based on the temperature difference feedback of the respective parts to realize high-precision gradient heating control of the gear to be heated. The temperature difference is controlled within the temperature accuracy, the production cost is reduced under the condition of meeting the requirementsof production quality, and the best economic benefit can be achieved for the enterprise.

Description

technical field [0001] The invention relates to the technical field of gear production, in particular to a method for controlling heating of weathering steel gears. Background technique [0002] Weathering steel gears are gears made of alloy steel made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel added. The advantages of atmospheric corrosion are widely used in machinery with high precision requirements and harsh climate environments. Although weathering steel materials greatly improve the physical and chemical properties of gears, it is very important to improve the quenching process of weathering steel gears in order to further improve the tooth surface strength, wear resistance and reduce stress concentration. Among the many processes in the quenching process, the quality of gear heating will seriously affect the quality of quenching. [0003] At present, in order to obtain better gear heating quality, people hav...

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Problems solved by technology

Although a small number of companies have used this technology to achieve better results in gear heating, they still have the following shortcomings: the existing dual-frequency power supply is not easy to start frequently, the accuracy of the output frequency signal is poor, and the amplitude and current of the two frequencies are different. The frequency is difficult to adjust independently and other disadvantages; compared with the single-frequency heating technology, although the dual-frequency heating reduces the temperature difference between the addendum and the tooth root during the heating process, the existing dual-frequency heating technology belongs to the rough heating stage. How to control more precisely and obtain a smaller temperature difference has not yet been resolved; dual-frequency heating technology has not been widely used in enterprises due to the high price of power supply and strict requirements on heating technology.

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