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アイテム
スリーブ組立式ロールにおける界面すべりに関する解析的及び実験的研究
https://doi.org/10.18997/00009062
https://doi.org/10.18997/00009062bd923fd3-ef50-4c80-81d2-a821d510f00d
| 名前 / ファイル | ライセンス | アクション |
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kou_k_549.pdf (7.9 MB)
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| アイテムタイプ | 学位論文 = Thesis or Dissertation(1) | |||||||
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| 公開日 | 2023-02-01 | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| タイトル | ||||||||
| タイトル | Analytical and Experimental Study for Interfacial Slip in Shrink-Fitted Bimetallic Work Roll | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | スリーブ組立式ロールにおける界面すべりに関する解析的及び実験的研究 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Abdul Rafar, Rahimah Binti
× Abdul Rafar, Rahimah Binti
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Among rolling rolls used in steel industries, instead of a solid roll, sleeve assembly types were tried to be used and some of them were practically and successfully used by shrink-fitting shafts into a hollow cylinder. They have some advantages for back-up rolls having a large trunk diameter exceeding 1000mm and also for large H-section steel rolls. The sleeve assembly type roll has the advantage that the shaft can be reused continuously by replacing only the worn sleeve due to the rolling. In addition, materials with excellent wear resistance and heat resistance, such as super cermet rolls and ceramic rolls, have poor toughness and high cost. Since these rolls are impractical, the sleeve assembly type structure is essential. On the other hand, this shrink-fitted structure has several peculiar problems such as residual roll bending and sleeve cracking due to the circumferential sleeve slip. The circumferential slippage sometimes occurs even the resistance torque at the interface is larger than the motor torque. Therefore, it is important to clarify the cause of the sleeve slip phenomenon in a sleeve structure. In this paper, the mechanism of interfacial slip in a sleeve assembly type roll constructed by shrink-fitting is verified by FEM analysis, and to apply it to the actual machine, the roll material, the fitting conditions, and the effect of the rolling load is considered. Finally, the experimental method of a miniature roll is demonstrated to verify the analysis. This paper consists of 7 chapters and is organized as follows. Chapter 1 introduced the bimetallic work roll and the problems encountered in the sleeve assembly type rolls. Although the shrink-fitting sleeve assembly roll has many advantages compared to the solid roll, it also has unique problems such as residual bending and sleeve slip. Therefore, the necessity to clarify the sleeve slip in the bimetallic work roll is described in this paper. In Chapter 2, the mechanism of the sleeve slip formation under free rolling for the hot rolling roll is considered. It has been shown that the sleeve slippage, known as an interfacial creep in bearings, is formed from the accumulations of the relative displacements on the shrink-fitted surface. In the actual roll problem, it is necessary to consider not only the sleeve but also the elastic deformation of the shaft, and the relative displacement between sleeve and shaft caused the interfacial slip. Therefore, in this chapter, to get closer to the actual rolling conditions, the effect of elastic deformation of the shaft on the interfacial slip is investigated under the free rolling state with reference to the previous study which the shaft is a rigid body. Furthermore, in addition to the steel shaft, other shaft materials are also considered to clarify the effect of elastic deformation of the shaft material on the interfacial slip. In Chapter 3, as in the previous chapter, the effect of rolling torque on the interfacial slip is considered for hot rolling rolls. In this chapter, the motor torque with the frictional force from the rolled steel may promote the slippage in the sleeve rolls significantly causing serious failure. Therefore, the motor torque effect will be investigated quantitatively. In this sense, the effects of the shrink-fitting ratio and the friction coefficient which are the parameters of the resistance torque are also considered since they may contribute to slippage resistance. Here, the interface slip and the displacement increase rate are analyzed. In Chapter 4, the interfacial slip in shrink-fitted roll is confirmed experimentally under free rolling conditions by using a miniature roll. Then, the behavior of the sleeve slip obtained in the experiment is considered and is compared with the numerical analysis results. The length of the scratch observed from the marking line of the miniature roll is equal to the calculated length of the scratch on the sleeve inner surface. This clarified that the relative slippage caused scratches on the interface. Also, it has been observed that the scratch caused by the interfacial slip forms a large egg-shaped. In addition, the effect of the sleeve inner surface scratches due to the interfacial slip on the sleeve strength is considered. In this chapter, the fatigue risk in terms of the stress concentration factor, Kt of the defect is evaluated. Chapter 5 focuses on the high-speed steel bimetallic sleeve rolls, which are made by shrink-fitting the composite sleeve and shaft. In this chapter, the inner surface stress of the sleeve caused by the sleeve slippage under the actual rolling conditions is obtained by numerical simulation; then its effect on fatigue fracture is clarified. Here, the damage caused by the sleeve slip is regarded as a defect, and the fatigue limit obtained by considering the root area √area of the defect is used in the durability diagram to evaluate the safety side of the damage in the sleeve roll. In this chapter, the maximum stress, minimum stress, and stress amplitude is clarified. It is shown that the stress amplitude under the impact force condition is significantly increased about twice from the standard condition. In Chapter 6, the difference of the residual stress generated between the bimetallic solid roll and the current study of bimetallic sleeve roll constructed by shrink-fitting is studied. Two types of the manufacturing process are considered in this chapter. Method 1 is turning inside of the solid roll after heat treatment. Method 2 is heat treatment after turning inside of the solid roll. The results show that Method 2 is better than Method 1 since the tensile residual stress can be reduced at the inside of the sleeve. After shrink-fitting of the shaft, the residual stress is compared with one of the solid rolls. Then, the evaluation of the fatigue risk in consideration of the residual stress is also studied. Chapter 7 summarizes the main conclusions of this study. | |||||||
| 言語 | en | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1 Introduction||2 Interfacial slip in shrink-fitted bimetallic work roll promoted by roll deformation||3 Interfacial slip in shrink-fitted bimetallic work roll promoted by motor torque||4 Experimental study to verify the interfacial slip||5 The inner surface stress and fatigue fracture analysis of shrink-fitted bimetallic sleeve roll||6 Residual stress simulation for bimetallic sleeve roll||7 Main conclusion | |||||||
| 備考 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 九州工業大学博士学位論文 学位記番号：工博甲第549号 学位授与年月日：令和4年3月25日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Sleeve roll | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Bimetallic work roll | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Shrink-fitted | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Interfacial slip | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Sleeve | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Shaft | |||||||
| アドバイザー | ||||||||
| 野田, 尚昭 | ||||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第549号 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（工学） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2022-03-25 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 17104 | |||||||
| 学位授与機関名 | 九州工業大学 | |||||||
| 学位授与年度 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 令和3年度 | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| ID登録 | ||||||||
| ID登録 | 10.18997/00009062 | |||||||
| ID登録タイプ | JaLC | |||||||
