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

基本信息

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

项目摘要

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.

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为了建立经济的方法，在典型的汽车扭矩转换器中占用了遗传齿轮，并系统地研究了残留的压力分布以及气磁冲击压力分布，表明该方法有效地对抗曲线，因此，为了建立经济的方法，我们采用了这种方法在非常复杂的形状中，并显示出对弯曲的表面的有效性。