基于UG二次開發的漸開線花鍵軸參數化建模

盧嘉錚　王瀚藝

【摘 要】漸開線花鍵軸作為一種重要的傳動部件，被廣泛用作較大載荷和對定心精度要求較高的機械傳動結構。而在花鍵軸的設計過程中，需要進行多次強度校核和尺寸修改，瑣碎、重復的建模極大地影響了設計效率。因此本文采用參數化設計方法，基于商用CAD軟件UG的二次開發功能，結合MFC，編寫客戶化菜單和對話框，實現漸開線花鍵軸的快速建模以供實際工程設計需求。參考漸開線齒輪的加工的過程，先建立軸的模型，再生成漸開線齒廓，最后進行布爾差操作模擬切削加工，得到完整漸開線花鍵軸三維實體模型，并可生成不同齒廓的模型，能進行多次參數變動后的漸開線花鍵軸快速建模，滿足實際工程優化設計中反復修改模型的需要。本文的工作展示了參數化設計的有效性和高效率，且在花鍵軸的實際設計過程中有一定參考價值。

【關鍵詞】漸開線花鍵軸；參數化設計；UG二次開發；MFC

中圖分類號： TG333 文獻標識碼： A 文章編號： 2095-2457（2018）04-0001-004

Parametric 3D Modeling of Involute Splined ShaftBased on UG Secondary Development

LU Jia-zheng WANG Han-yi

（School of Aeronautical Engineering， Civil Aviation Flight University of China，Guanghan，Sichuan 618307）

【Abstract】The involute spline shaft is widely used in mechanical structure which is bearing a heavy load and requiring high precision of centering accuracy on account of its prominent advantages as an important part of torque and motion transmission. In the design of an involute spline shaft， a balance should be struck between strength checking and dimension modifying， thus leading to great repetitive modeling work， which reduces the efficiency of the design. Thus， based on secondary development of commercial CAD software UG， combined with MFC， a customized menu and a dialog in accordance with parametric modeling method were built， to meet the demand of quick modification of involute spline shaft. Referring to the manufacturing process of the involute gear， we model the shaft first， then involute tooth profiles， finally get the aimed involute spline shaft 3-D solid model through subtract-bool operation. Besides， series of spline shafts can be modeled and quick modified， satisfying the needs of repetitive modeling work of optimal designs. This paper demonstrates the high efficiency and effectiveness of parametric modeling method， provides certain instructions for the spline shaft designing as well.

【Key words】Involute Splined Shaft； Parametric Design； Secondary development of UG0 引言

花鍵聯接，如圖1，是在平鍵聯接的基礎上發展而形成的一種鍵聯接方式，其齒面接觸好，啟動時承載能力好，強度高，精度高，互換性好，刀具經濟，因此，其在載荷較大和定心精度要求較高的各類機械結構聯接中被廣泛應用[1]-[2]。但其造型較為復雜，尤其是齒形的建造較為困難，建模需耗費相當多的時間，且尺寸改動時涉及較多參數，建模效率低下。另外，完整的機械優化設計，根據經驗從初步設計出發，經過多次循環反復的強度校核、結構修正等大量計算，最終得到最優設計結果，如圖2所示。……