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CSME 2021/10
Volume 42 No.5
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509-519
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Tooth Flank Modification of a Helical Gear by Using Modified Tangential Dressing Motion in a Gear Generating Grinding Machine
Gwan-Hon Chen a and Zhang-Hua Fong b
aProfessor, Department of Mechanical Engineering, National Chung Cheng University, Chiayi, Taiwan 621301, ROC.
bDepartment of Mechanical Engineering, National Chung Cheng University, Chiayi, Taiwan 621301, ROC.
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Abstract:
The tooth flank of a ground helical gear is conventionally crowned by adjusting the radial feed of the grinding worm while the grinding worm is moving axially with respect to the working gear in a modern computer numerical control (CNC) gear generating grinding machine. However, the tooth flank of a helical gear crowned using this modified radial feed method is frequently twisted. Therefore, we propose a tooth flank modification method for helical gears with the grinding worm fed diagonally (combined tangential and axial feed) while the grinding worm is meshing with the working gear in a grinding machine. In addition, the grinding worm is dressed by the dressing disk with additional tangential dressing motion (TDM) while the dressing disk is moving axially with respect to the rotating grinding worm. Because all the required corrective motions for the proposed TDM method are existing CNC controlled axes in modern gear grinding machines, the proposed method can be implemented easily without modifying the grinder hardware. Two numerical examples are presented to validate the proposed TDM tooth flank modification method with four simultaneously controlled axes.
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Keywords: tangential dressing motion, generating grinding, helical gear, tooth flank modification.
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*Corresponding author; e-mail:
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©
2021
CSME , ISSN 0257-9731
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