NX involute deflection helical cylindrical gear modeling method

Abstract

The invention discloses an NX involute deflection helical cylindrical gear modeling method. The method is a custom feature (hereinafter referred to as UDF) based on NX. The UDF is a hobbing action; custom pairing gear pair parameters can be supported; modified gear can be supported, arbitrary rotation direction switching of helical gear can be supported, switching of driving and driven gear parameters can be supported, deflection or non-deflection straight-tooth gears are compatible, gear pair backlash and gear manufacturing inspection parameters with different parameters and different manufacturing precisions can be output, modleling of cylindrical gears can be realized efficiently and stably, and a tooth model can be generated averagely for 2-4 seconds.

Description

technical field [0001] The invention relates to the field of gear modeling, in particular to an NX involute displacement helical gear modeling method. Background technique [0002] At present, most of the existing involute cylindrical gear modeling methods are "additive" modeling process. The basic modeling idea is: establish the base circle → establish the involute equation → generate the involute curve → generate the first profile curve→extrusion to form the first tooth→array feature to form a complete gear. This kind of modeling method has the following disadvantages: first, the actual gear manufacturing is a process of "removing material", and "adding material" is seriously inconsistent with the actual situation; second, it cannot handle the end face of the cylindrical gear shaft and the fillet of the shaft section, and the tooth The chamfering of the end face is also extremely inconvenient; the third is that it is impossible to deal with the "hob marks" of the cylindri...

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Problems solved by technology

This kind of modeling method has the following disadvantages: first, the actual gear manufacturing is a "material removal" process, and "addition" is seriously inconsistent with the actual situation; second, it cannot handle the end face of the cylindrical gear shaft and the fillet of the shaft section, and the tooth The processing of the end face chamfer is also extremely inconvenient; the third is that it is impossible to deal with the "hob marks" of the cylindrical gear shaft; the fourth is that the modeling efficiency is low, and the general gear generation time is more than 25 seconds; the fifth is that the gear parameters are ever-changing and the features are compatible Many gear parameters cannot be generated normally; the sixth is that the actual design gear structure is complicated, and this kind of gear modeling method cannot meet the needs of professional gear design

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