Abstract
Variable pressure angle (VPA) hob is an important cutting tool for generating the twist-free tooth flanks on a crowned involute helical gear used in the high precision gear boxes. However, an appropriate method for generating the VPA hob surface has not proposed yet. Therefore, this paper presents a worm grinding method for generating the helical surface of VPA hob on a CNC worm grinding machine. A mathematical model of the proposed method is established based on a standard hob by controlling rotational motion of the hob axis in the worm grinding process. A numerical example is implemented to verify the merits of the proposed method.
Highlights
In batch production of small external gears and consideration of more efficient process, the generating grinding method is usually adopted for the hard finishing of gears instead of the form grinding method
Numeral results show that the proposed Variable pressure angle (VPA) hob surface generated by grinding worm is close to the theoretical VPA hob surface
A new method for grinding the VPA hob with a grinding worm on a CNC machine is proposed by controlling rotational motion of hob axis (Eq (20))
Summary
In batch production of small external gears and consideration of more efficient process, the generating grinding method is usually adopted for the hard finishing of gears instead of the form grinding method. In this study, we proposed a worm grinding method for grinding the VPA hob on a CNC grinding machine. Wirz [2]-[4] patented a method, tool and device for profiling the grinding worm that applies in the continuous gear grinding. Patented a dressing method for the threaded grinding wheel that can obtain the twist-free tooth flanks of gear workpiece in the gear grinding process. Tran et al [14], [15] proposed a novel hobbing method to free twist tooth flanks of the longitudinal crowned helical gear by using variable pressure angle hob cutter on CNC hobbing machine. A method for grinding a standard hob as a VPA one is proposed by using the grinding worm on a CNC grinding machine. Numeral results show that the proposed VPA hob surface generated by grinding worm is close to the theoretical VPA hob surface
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