Module-based Automation Design Of Planetary Reducer And Research On Modified Tooth Surface Reconstruction Technology

Planetary gear reducer of low speed and heavy loading was widely used in machinery equipment of mining, coal mining, shipbuilding and others places as the deceleration, speed change or speed-up transmission.But the design calculations were complicated and workload, in order to improve design efficiency and adapt to the needs of market competition, we need to adopt new design method of Planetary reducer design. At the same time, In order to improve the gear carrying capacity and stability of the low-speed, heavy-loading planetary gear reducer, we need to modify the gear surface and reconstruct the modified gear.This paper applied modular thought in the design of reducer, and developed a set of automation design system for planetar reducer based on knowledge base and a parametric design system for modules. At the same time this paper reconstructed modified gear surfaces Using NURBS surface based on the modified results, and got the modified gear model in the CATIA environment.Main contents of the paper are as follows:(1) Programing the design knowledge of planetary reducer, and developed a set of automation design system for planetar reducer based on knowledge base using CAA second development tools of CATIA.(2) Applied the modular design idea in reducer design, and classified the planetary gear reducer using modular design idea. Developed a parametric design system for modules which was classified before. Built the constraints between reducer models, assembled the reducer automatic using the bottom to up method, and Checked interference.(3) Researched of the interpolation algorithm of NURBS curves and surfaces, and calculated the control points, node vector, weight factor parameters on NURBS surface using CATIA and CAA second development tools of CATIA based on the modified results.(4) Parameterized reconstruct the modified gear surface in the CATIA environment using the NURBS parameters. Got the requirements surface by adjusting the control points and weights. Got the modified gear model in the CATIA environment.The automation design system for planetar reducer developed in this paper improved the design efficiency of planetar reducer, and the parametric design system for modules adapted to other types of reducers’design with a certain degree of versatility. Modified tooth surface reconstruction system displayed the modified gears in the CAD environment, and provided a model to verify the results of the modification, and with certain innovative.