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Finishing process analysis between honing and hard hobbing in pinion gears applied to a steering system

2012; Elsevier BV; Volume: 14; Linguagem: Inglês

10.1016/j.egypro.2011.12.888

1876-6102

Sandro Pereira dos Santos, Lincoln Cardoso Brandão, Luis Henrique Gallicchio, Zilda de Castro Silveira,

Adhesion, Friction, and Surface Interactions

Among the techniques used in surface finish machining of gears, the honing process has been highlighted due to high efficiency in the finishing of hardened gears and ease of adjusting the involutes profile and incident angle in the counter-part. The gear honing process is used to eliminate errors that appears after the heat treatment on the tooth surface and. Although the material and cutting speed of the tool are similar to the grinding process, honing the process simulates true cinematic movement of the mesh gear, which provides a better surface roughness compared to the Hobbing process. Consequently, it is hard to correct anomalies in the gear teeth. This process has been used to improve the mechanisḿs hydraulic steering pinion / rack system. For the experiments, it were compared two processes, namely honing and hard Hobbing in order to assess the adequate strength in the direction of clockwise rotation and counter clockwise, which represents the actual effort exerted by the driver of the vehicle. The honing process was lead using a 400 Fassler HMX machine tool. In order to assess the significant difference between the experiments, it was used ANOVA and Tukey test. The results obtained from the experiments using the honing process were satisfactory as compared the results obtained from hard hobbing process. Thus, it can be concluded that this process provides an excellent surface finish of the sprockets having a direct impact on the returned vehicle steering system