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Development of Shotless Peening System and Manufacturing Considering Preservation of Environment

考虑环境保护的无喷丸喷丸系统和制造的开发

基本信息

批准号：
13555022
负责人：
SOYAMA Hitoshi
金额：
$ 5.63万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

1.The cavitating jet in air was successfully realized using cavitation shotless peening system without a water-filled chamber. It was revealed that the cavitating jet in air was most powerful compared with a cavitating jet in water and a normal water jet in air.2.The erosion test and measurement of cavitation intensity were carried out at various conditions to measure the ability of cavitating jet in air, then the optimum condition of the cavitating jet was obtained.3.Several steel were peened by the cavitating jet in air, the residual stress was measured by an X-ray diffraction method. The introduction of compressive residual stress was demonstrated. It shows the possibility of the surface modification by using the cavitating jet in air.4.The optimum peening time was obtained from the relation of the peening time and the residual stress or the fatigue test at constant load changing with the peening time.5.In order to compare the proposed shotless peening considering the prevention of environment and the conventional shot peening, a rotating bending fatigue test was carried out, and it was shown that the improvement of fatigue strength by shotless peening was better than that of shot peening.6.In order to establish non-destructive testing method to evaluate the surface modification layer peened by the shotless peening, the residual stress and austenitic ratio were measured by using an X-ray diffraction method.7.The improvement of fatigue strength of gear was demonstrated by a bending fatigue test of gear tooth comparing the result of shot peening.8.In order to apply the shotless peening to various materials, the relation between the cavitation intensity and the materials properties was investigated, and the fundamental threshold level of materials for the cavitation impact was revealed.

1.利用无水室空化喷丸系统，成功地实现了空气中的空化射流。结果表明，空气中的空化射流比水中的空化射流和空气中的普通水射流具有更强的冲击力。2.在不同的条件下进行了冲蚀试验和空化强度的测量，以衡量空化射流在空气中的能力，得到了空化射流的最佳条件。3.用空气中的空化射流对几种钢材进行了喷丸处理，并用X射线衍射法测量了残余应力。论证了残余压缩应力的引入。4.根据喷丸时间与残余应力的关系或恒载疲劳试验随喷丸时间的变化，确定了最佳喷丸时间。5.为了比较考虑环境保护的无喷丸喷丸与常规喷丸处理的疲劳性能，进行了旋转弯曲疲劳试验，结果表明，无喷丸喷丸对表面疲劳强度的改善优于喷丸喷丸。6.为了建立无喷丸喷丸表面改性层的无损检测方法，用X射线衍射法测量了齿轮的残余应力和奥氏体率。7.通过对齿轮进行弯曲疲劳试验，并与喷丸处理的结果进行比较，证明了齿轮疲劳强度的提高。8.为了将无喷丸喷丸应用于各种材料，研究了空化强度与材料性能的关系，揭示了材料空化冲击的基本门槛水平。