The Study of Quality Improvement of Forging Straight Bevel Gear Machining.

• Main Authors: Kuan-Hsien Lu, 呂冠賢
• Other Authors: 王培郁
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/d8w76r

碩士 === 國立虎尾科技大學 === 機械設計工程研究所 === 102 === In order　to gain high　strength and improve the productionefficiency,making straight bevel gears by forging procedure　is already become a trend. However it has been criticizing for the　tooth surface finishing and pitch run out accuracy on forging gears.The pitch run out accuracy depends on forging die core manufacturing procedure and machined forging blanks. The process of forgingdie core in this research is using hard engraving which ignores thedeviation effect of pitch run out accuracy caused by the engravingaccuracy.Therefore, this thesis only focus on how to improve thepitch run out accuracy for machined forging blanks procedurestoanalysis.First,using Mathematica software to set up straightbevelgear tooth shape to process tooth face data to calculate and import Pro/E straight bevel gear forging die core 3D model andpitch diameter fixture 3D model.After that, using CAD/CAM toengrave forging die core and pitch diameter fixture directly. Straightbevel gear geometric area is the only part which do not need toprocess of gear blank　　　　geometric from mechanical to finishedproducts.Therefore, the design of pitch diameter fixture is that wedo not need the machined tooth face to be the bearing surface todefine the gear axis of rotation, mounting distance, tooth thickness to ensure the pitch run out accuracy. However, the processer inorder to increase the efficiency, often use high feed rate to cut gearblanks,since the contact bearing surface of pitch diameter fixtureand forging blanks is small,the large cutting power will cause the tooth face damaged.To solve the efficiency of process, tooth facedamaged and ensure run out accuracy at the same time, this thesis process in batch by the mechanical bearing design of gear blank core which prove the new design of gear blank core could increasethe processing efficiency,not to damage the tooth face andmaintain the run out accuracy of mechanical by pitch diameter fixture.