Hydrodynamic Study in Order to Improve Residual Stress in Several Machine Parts by Means of Ultra-High-Speed Submerged-Jet-Peening

通过超高速浸没喷射喷丸改善多种机械零件残余应力的流体动力学研究

• 批准号: 12305013
• 负责人: RISABUROU Oba
• 金额: $ 26.84万
• 依托单位: Saitama Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12305013/
• 关键词: peening; Cavitation; Machine parts; fatigue strength; Water jet; 噴流; ピーニング; 残留応力; 気泡雲; 渦; 衝撃波; 脆性破壊; 気泡

Supersonic behavior of cavitation bubble cloud developed along the highspeed submerged water jet, especially the occurrence mechanism of highly erosive singular vortex bubble, by which the peening effectiveness is most powerfully affected, systematically investigated, in order to surpass the fatal fatigue fracture on atomic reactor pressure-vessels.As it has been recently reviewed by the writer, clearly, the highly erosive vortex cavitation of present interest is very sensitive to the cavitation nuclei Fortunately, as the nuclei are much dependent on water temperature, flow turbulence, vented air as well as separation region along the nozzle surface, in the present studies, therefore, their effectiveness is systematically, quantitatively evaluated, showing useful possibility to control the peening power effectively.By means of highspeed photography, we can clearly observe the singular vortex bubble arisen under a deep cavitation cloud, so that we can find a direct method to specify the mechanism of such a water-jet-peening.Finally, in order to establish economical method to make peening on several machine parts of very complex shape, we take up the herical gear set within a typical automobile torque converter, and systematically investigate residual stress distribution as well as cavitation shock pressure distribution, showing that this method is much effective against the curved surface.

系统研究沿高速水射流发展的空化气泡云的超音速行为，特别是对喷丸效果影响最大的高侵蚀性奇异涡泡的发生机制，以超越原子反应堆压力下的致命疲劳断裂-血管。正如作者最近评论的那样，显然，目前感兴趣的高度侵蚀性涡旋空化对空化核非常敏感，幸运的是，因为空化核非常依赖因此，在目前的研究中，对水温、流动湍流、排出空气以及沿喷嘴表面的分离区域的影响，对它们的有效性进行了系统、定量的评估，显示了有效控制喷丸功率的有用可能性。通过高速摄影，我们可以清楚地观察到深空化云下产生的奇异涡泡，从而找到一种直接的方法来明确这种水射流喷丸的机理。最后，为了建立在多台机器上进行喷丸的经济方法部分针对形状非常复杂的情况，我们采用典型汽车变矩器内的斜齿轮组，系统地研究了残余应力分布以及空化冲击压力分布，表明该方法对曲面非常有效。

项目成果

Simulation and Experimental Verification of Axial Multi-Crack Propagation and Crack Kinking in Pressurized Fuselage

加压机身轴向多裂纹扩展及裂纹扭结模拟与实验验证

• 发表时间: 2001
• 期刊: Fracture and Strength of Solids Part 1 183-187
• 作者: A.Shimamoto;et. al.
• 通讯作者: et. al.

Behavior of Cavities Formed by Submerged Water Jets for Two Kinds of Nozzles

两种喷嘴浸没水射流形成的空腔行为

• 发表时间: 2000
• 期刊: J.Jet Flow Engng. Vol.17
• 作者: Y.Ito;T.Sakamoto;T.Yamaguchi;T.Uchiyama;R.Oba
• 通讯作者: R.Oba

Chuncheng Liu, 巨 東英: "Study of Bainitic Transformation Kinetics and Stress-assisted Transformation"Journal of Material Science and Technology. Vol.96. 218-232 (2001)

刘春城，胡东英：“贝氏体转变动力学和应力辅助转变的研究”材料科学与技术杂志第96卷（2001）。

大ブロッケージ係数の場合のキャビテーション試験水槽測定部内の遷移レイノルズ数の特異な挙動

大堵塞系数情况下空化试验池测量段过渡雷诺数的特殊行为

• 发表时间: 2002
• 作者: 香林丈治;大場利三郎;ほか
• 通讯作者: ほか

津田 紘, 内山恒久, 巨 東英, 大場利三郎: "ウオータージェットピーニングによる歯車表面の残留応力改善"日本材料学会第51期学術講演会講演論文集. 227-228 (2002)

Hiro Tsuda、Tsunehisa Uchiyama、Tohide Kyo、Risaburo Ohba：“通过喷水喷丸改善齿轮表面的残余应力”日本材料学会第 51 届学术会议论文集 227-228 (2002)。