Abstract
For parts with complex structures such as bevel gears, electromagnetic heating is an environmental friendly heat-treatment method of high efficiency. However, since high-frequency induction heating is restricted by the unique rung and proximity effects, it is difficult to generate a uniform heating later for complex parts, such as bevel gears. Therefore, the effect of the number of iterative heating on the uniformity of temperature distribution is explored when asynchronous dual-frequency induction is used for heating a bevel gear. The variations of the effect of asynchronous dual-frequency heating with the number of iterations and the intermediate-frequency (6 kHz) heating time to high-frequency (100 kHz) heating time ratio are disclosed. The uniformity of the temperature distribution in the tooth width and tooth profile directions of a bevel gear is improved constantly with the increase in number of iterations; however, after the number of iterations reaches a certain value, the uniformity of the temperature distribution is not changed greatly. On this basis, the influences of process parameters in dual-frequency induction heating on the temperature distribution are discussed. The results of this work should promote application of dual-frequency induction heating and expand its universality.
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