Solid Modeling And Finite Element Analysis Of ZK-type Worm And Worm Gear

The ZK-type worm gear set is well worth using and popularizing, because its precision worm can be ground by a straight-edged grinding wheel. But due to the lag of theoretical research and the lack of practical machining process, it has still not been adopted widely. To further perfect and deepen theoretical study and to realize the independence of its design and manufacture is very necessary and very pressing.Now the period of product upgrade and replacement is shorten for the rapid development of many advanced theories and technologies, such as Computer Aided Design(CAD),Flexible Conjugate Principle, Finite Element Analysis(FEA),Tooth Contact Analysis(TCA),Computer Simulaiton, Intelligent Optimization Methods.The purpose of this thesis is to realize three-dimensional modeling and Finite Element Analysis of ZK-type worm gear set based on further perfecting its conjugate principle.Firstly, the concept "Feature Profile" was put forward according to "Feature Modeling".The feature profiles of ZK-type worm and worm wheel were systemically studied so as to lay the groundwork for the design and manufacture of machining tools, measuring and control of machining precision, solid modeling.And the effects and effect laws of misalignment on the ZK-worm profile errors were analyzed.Secondly, from a new angle the generation course of ZK-worm fillet was explained via CAD approach.The mathematical equations of ZK-worm fillet was derived. The concept "Undercutting Eestimation Line" was put forward and the Undercutting Eestimation Criterion was given.The effect of the correlative parameters on the undercutting were studied. These researches are very important to rightly design tools , make precision worm and analyze strength.Thirdly, according to the real machining of ZK-type worm and worm wheel, the machining simulation of them were realized by Visual Basic operating AutoCAD based on ActiveX. The simulation profiles were used to verify the undercutting and fillet equation of ZK-worm.Lastly, the three-dimensional solid models of ZK-type worm and worm wheel were made in Pro/E based on their feature profiles.And the Tooth Contact Analysis via Finite Element Method was done in ANSYS.Researches of this thesis laid the groundwork for the digital design and manufacture of ZK-type worm gear set.