| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 107 === This paper deals with a computer analysis of the induction heat treatment of a rack for vehicle power steering system. Through the analysis, the appropriate coiler type and the setting of the induction heating conditions to meet the requirement. This can reduce the mistakes in design and processing of an asymmetric hardening depth can be known, thereby shortening the cycle on validation and reducing the cost due to failure.
In the study, three different types of the coiler (round, cut-round, horseshoe) individually exerted with three induction heating conditions (10 KHz, 500A/ 3 KHz, 500A/ 10 KHz, 1500A) and various processing times are used to analyze the heat treatment of the rack. From the simulation results, the effects of electric frequency, electric current, coiler type and coiler position on the temperature distribution in the rack and obtained. When the electric frequency is high, the surface temperature on the rack fulfills the requirement. But the penetration depth is insufficient. When the electric frequency is low, a low electric power would need a long heating time. This leads the input heat to affect the core of the rack through heat conduction and causes the entire rack being hardened. At a low electric frequency and a high power, the result of the heat treatment meets the requirement. The horseshoe shape of the coiler provides a rather uniform distance between the rack and the coiler, which makes the penetration of the temperature reach the demand. Incorporating an electric frequency of 3 KHz and an electric current of 1500A, the combination can be treatment as a basis in the design of the coil for the heat treatment of the rack in the future.
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