博碩士論文 963203021 詳細資訊




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姓名 王婉茹(Wan-ju Wang)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 粉末冶金齒輪齒根疲勞強度之研究
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摘要(中) 粉末冶金製造技術最大優點在於可大量生產元件,降低製造成本。尤其隨著粉末冶金技術的進步,粉末冶金材料的機械強度表現愈佳,更適合應用傳動齒輪之製造。目前國內對於新製程或新材料所製成的粉末冶金齒輪之疲勞特性尚不明確,同時亦欠缺相關測試之數據,本論文則針對粉末冶金正齒輪齒根強度進行相關研究。
在本論文中,粉末冶金齒輪齒根應力是根據ISO 6336-3方法B來計算,並輔以有限元素分析進行驗證。為建立齒輪齒根疲勞強度標準實驗程序,本論文先進行測試治具之設計,並驗證此型式之設計在加工、組裝誤差對齒輪負載位置精度的敏感度甚低。實驗測試齒輪之材料使用常用之Fe-1.75Ni-0.5Mo-1.5Cu-0.4C燒結合金鋼(相當於MPIF FD-0205),以振動測試的方式,在MTS疲勞試驗機進行齒輪的齒根疲勞測試。測試結果則應用韋伯分布函數來推估不同可靠度下齒根強度值,並據以建立疲勞曲線圖。
摘要(英) Powder metallurgy (PM) technology has the advantages in mass production of components and thus reduced manufacturing cost. Recently, the mechanical behavior of PM materials is getting better because of improvements in PM technology, so PM materials are suitable for application in gear transmission. However the design information on fatigue properties and strength data of PM gears made by new manufacturing processes or new materials are not sufficient for the domestic manufacturers. The aim of this thesis is to study the tooth root strength of PM spur gear.
The tooth root stress of PM gear is calculated according to ISO6336-3 method B and verified by the finite element method. In order to set up the standard test procedure, a test fixture was designed and verified that the sensitivity to deviated root stress due to assembly errors or machining errors of the test fixture is low. The test gears were made of sintered steel (Fe-1.75Ni-0.5Mo-1.5Cu-0.4C). The fatigue test was conducted on a MTS test machine by the pulsing method. A S-N curve of the test material was established by using the fatigue test data according to Weibull distribution for the failure probability.
關鍵字(中) ★ 粉末冶金燒結齒輪
★ 齒根強度
★ 疲勞測試
關鍵字(英) ★ tooth root strength
★ fatigue test
★ powder metallurgy gear
論文目次 摘要i
Abstract ii
誌謝iii
目錄iv
圖目錄vi
表目錄x
第1章緒論1
1.1研究背景1
1.2文獻回顧3
1.2.1齒根強度3
1.2.2齒根疲勞測試5
1.3研究目的10
第2章研究方法12
2.1漸開線齒輪幾何特性12
2.1.1漸開線齒廓基本幾何關係12
2.1.2輪齒跨距幾何關係13
2.2齒根彎曲強度14
2.2.1幾何特徵與齒輪參數14
2.2.2齒根彎曲應力計算理論16
2.3疲勞實驗原理19
2.4韋伯分布函數21
第3章齒根強度測試用治具之設計25
3.1設計原理與重點 25
3.2粉末冶金漸開線齒輪齒廓幾何關係28
3.2.1漸開線起點與終點參數29
3.2.2座標轉換30
3.2.3齒根圓角關係32
3.2.4齒頂圓角關係33
3.3治具幾何設計35
3.3.1治具與測試齒輪幾何關係 35
3.3.2測試齒的工作壓力角36
3.3.3壓片尺寸之數學式推導37
3.3.4負載半徑的限制範圍39
3.4治具強度分析43
3.4.1治具彎曲應力分析43
3.4.2鋼珠表面強度分析44
3.4.3強度分析結果45
3.5幾何尺寸精度分析46
3.5.1加工誤差影響關係式建立48
3.5.2誤差分析結果52
3.6齒根強度換算程式53
3.6.1對稱負載配置測試治具之幾何推導53
3.6.2程式介面與計算流程57
第4章實驗規劃與進行59
4.1疲勞實驗設備與測試治具59
4.2測試齒輪61
4.3實驗規劃與流程63
4.4齒根應力理論計算驗證65
4.4.1模型建立方式66
4.4.2分析參數設定66
4.4.3模擬結果67
第5章實驗結果討論71
5.1實驗結果71
5.1.1靜態測試71
5.1.2動態疲勞測試72
5.2結果討論與分析74
第6章結論與展望77
6.1結論77
6.2未來展望77
參考文獻79
附錄一 疲勞壽命與破壞機率對照表83
附錄二 韋伯分布函數二參數式分析結果84
附錄三 韋伯分布函數三參數式分析結果86
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指導教授 蔡錫錚(Shyi-jeng Tsai) 審核日期 2008-7-21
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