Abstract
In industrial practice, cylindrical worm gears are most often used due to their feasibility. In the literature, much attention has been paid to determining the helical surface of worms of such transmissions. Globoidal worm gearboxes are much less frequently used due to technological difficulties. Come on, the globoidal worm ensures simultaneous cooperation of a larger number of teeth and the location of the teeth contact line is more favorable. Therefore, the following is an analytical method for the description of a globoid surface by turning and by a finger milling method.
Highlights
Globoid worms can be shaped with a knife by the turning profiling method
This is important to the machining of the globoid worm by the hobbing method, whose surface cannot be described with respective motion
Two types of the surface of the globoid worm machined according to two different methods have been described
Summary
Globoid worms can be shaped with a knife by the turning profiling method. Machining by turning is little efficient, and taking into account shaping the convolution surface over the full profile height in the finishing pass, the surface quality parameters and machining accuracy may be low. The above discussion implies that the wormwheel tooth surface can be determined as the worm surface envelope, on assumption that the hob action surface is identical, which is rather unlikely in practice (a single knife with the required profile corresponding to the worm profile is much easier to make) [10, 11]. Another conclusion from this discussion is that the accurate execution of the globoid worm gear is very difficult (practically, rather impossible). We mean gears, where the mating surfaces of the toothing (of the worm and the wormwheel) are, on assumption, mutually enveloping (coupled) [12]
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