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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72367

    Title: 以數值模擬與實驗驗證研究 精密深溝滾珠軸承多道次溫間鍛造製程 -缺陷分析與模具設計合理化;Numerical analysis and experimental validation on multi- stage warm forging process of deep groove ball bearing --- defect analysis and tooling design rationalizationNumerical analysis and experimental validation on multi- stage warm forging process of deep groove ball bearing --- defect analysis and tooling design rationalization
    Authors: 黃傑泓;Huang,Jie-Hong
    Contributors: 機械工程學系
    Keywords: 軸承;熱/溫間鍛造;有限元素分析;鍛造實驗;整體結構;Ball bearing;Hot/Warm forging;Finite element method;Experiment;Structural integrity
    Date: 2016-07-06
    Issue Date: 2016-10-13 14:50:39 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文研究多道次溫鍛軸承模擬以及實驗分析,配合溫鍛模擬數值以及實驗結合,使模具合理化,分析鍛件產品不良品可能原因,設計變更模具,有效提升軸承產
    量及穩定度,降低不良率發生,並延長模具壽命。 除此之外,為了瞭解到模擬與實際鍛件設計上的差異與情況,在執行每一階段的鍛造,保留每個階段性的鍛品與模擬情況作比對分析,比對三維/二維有限元素分析,謹慎地執行模擬與試驗的研究比較。

    ;In this study, a multi-stage warm forging process for making bearing rings is numerically and
    experimentally investigated. The aim of the study is to determine the crucial station of the finishing forging process such that the tool wear is prolonged and tool fracture should be minimized. In addition, in order to ensure the appropriateness of the suggested modification, a 3-dimensional finite element simulation on each sequence is performed, and carefully compared with experimental investigations.
    Numerical simulations results indicate that the redesigned upper punch geometry, radius(R2) of the finishing forging process, demonstrates drastically different deformation rate (the effective strain/effective stress distribution) and material flow pattern, as compared with chamfer (C2) counterpart. Accuracy of the numerical models has been verified by comparing with experimental measurements . In addition, the numerically and experimentally validated process includes the detailed tooling design and dimension variation, which is of great importance in maintaining the overall structural integrity of the forging die/punch and thus, the stability of the whole process. Concerning on the waste ratio comparison, the method used steel rods are as raw material and the IR/OR rings form is given by hot/warm forging and sequential cold rolling processes and the waste ratio decreases to ~9%. Finally, it is shown that the multi-stage warm forging process in this study could be successfully applied to the high-quantity production (10,000 pieces/hr) of the IR/OR of the deep groove ball bearing with the stability and structural integrality of the whole process.
    Appears in Collections:[機械工程研究所] 博碩士論文

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