Research on Surface Modification System by Using a Cavitating Jet

空化射流表面改性系统的研究

• 批准号: 10555025
• 负责人: SOYAMA Hitoshi
• 金额: $ 3.9万
• 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: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555025/
• 关键词: Surface Modification; Impact; Residual Stress; Corrosion Resistance; Cavitation; Jet; Fatigue Strength; Peening; ノズル; ショットピーニング; 最適加工速度; 寸法効果

1.Surface modification system has been developed considering scale effects of nozzle diameter. Diameter of nozzle is from 0.4mm to 1.9mm.2.Cavitation impacts were measured by a PVDF transducer for various cavitating conditions. When the nozzle diameter was increased, the frequencies of the cavitation impacts were not only increased but also the intensity of the cavitation impacts increased. Reducing air contents ration in the test water also increased the cavitation impacts.3.Optimum peening time or optimum scanning speed was demonstrated by measuring hardness or residual stress. The cavitating jet can introduced compressive residual stress in the surface of the materials. The value of the compression was saturated at certain processing time or speed. In case of the improvement of the corrosion resistance by using a cavitating jet, optimum processing time was obtained by the relation between the potential by means of an electrochemical method and the processing time.4.Regarding test liquid of the cavitating jet, several liquids ware tested changing with pH.Suitable test liquids for iron were clarified referring Pourbaix diagram of iron.5.Peening for gears and specimens with a notch was carried out. It was revealed that the peened surface by a cavitating jet was very smooth comparing with that of the shot peening. The cavitating jet can also introduce the compressive residual stress into hard materials such as tool alloy SKD61.6.In order to demonstrate improvement of fatigue strength by suing a cavitating jet, a rotating bending fatigue test was carried out. It was shown that the cavitating jet could improve the fatigue strength. It was also revealed that the cavitating jet could improve the corrosion resistance about 30% by means of an electrochemical method.

1.考虑喷嘴直径的尺度效应，开发了表面改性系统。喷嘴直径为0.4 ~ 1.9mm。2.利用PVDF传感器测量了不同空化条件下的空化冲击。随着喷嘴直径的增大，空化冲击的频率和强度均增大。通过硬度和残余应力的测定，确定了最佳喷丸时间或最佳扫描速度。空化射流在材料表面产生残余压应力。在一定的加工时间或加工速度下，压缩值达到饱和。在利用空化射流提高耐腐蚀性的情况下，通过电化学方法的电位与处理时间之间的关系，获得了最佳处理时间。4.对于空化射流的试验液，试验了几种不同pH值的试验液，并参照铁的Pourbaix图，确定了适合铁的试验液。贯彻结果表明，与喷丸相比，空化射流的喷丸表面非常光滑。空化射流还可以将残余压应力引入到工具合金SKD61.6等硬质材料中。结果表明，空化射流能有效地提高疲劳强度。电化学测试结果表明，空化射流可使涂层的耐蚀性提高30%左右。

项目成果

祖山均: "キャビテーション衝撃力の利用による水噴流の加工能力の増大とその機械材料のピーニングへの利用"噴流工学. 16. 22-28 (1999)

Hitoshi Soyama：“利用空化冲击力提高水射流的加工能力及其在喷丸机械材料中的应用”Jet Engineering，16. 22-28 (1999)。

H.Soyama, T.Kusaka, M.Saka and Y.Takano: "Surface Modification of Forging Die by Using Cavitating Jet"Proc.34th JSME Meeting of Tohoku Branch. 207-208 (1999)

H.Soyama、T.Kusaka、M.Saka 和 Y.Takano：“利用空化射流对锻造模具进行表面改性”Proc.第 34 届 JSME 东北分会会议。

H.Soyma: "Mechanism and Applications of Water Jet Technology"Text of 12th Liquid droplets. 63-72 (2000)

H.Soyma：《水射流技术的机理与应用》第12液滴的文本。

H.Soyama,T.Kusaka and M.Saka: "Shotless Peening of Tool Alloy Steel SKD61 by Using Cavitation Impacts"Proc.International Workshop on Sensing and Evaluation of Materials System. 117-122 (2000)

H.Soyama、T.Kusaka 和 M.Saka：“利用空化冲击对工具合金钢 SKD61 进行无喷丸喷丸”Proc.国际材料系统传感与评估研讨会。

祖山均,坂真澄,佐藤東: "キャビテーション噴流による歯車のピーニング"日本機械学会東北支部多賀城地方講演会講演論文集. 149-150 (2000)

Hitoshi Soyama、Masumi Saka、Higashi Sato：“通过空化射流对齿轮进行喷丸处理”日本机械工程师学会东北分会多贺城地区会议记录 149-150 (2000)。