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    • 2. 发明专利
    • Method and device for improving residual stress in pipe inner surface by water jet peening
    • 通过水喷射改善管内表面残留应力的方法和装置
    • JP2011083892A
    • 2011-04-28
    • JP2011012468
    • 2011-01-25
    • Bab-Hitachi Industrial CoHitachi-Ge Nuclear Energy Ltdバブ日立工業株式会社日立Geニュークリア・エナジー株式会社
    • KUROSAWA KOICHISAITO NOBORUNITTA KAZUAKIUNNO SHOICHI
    • B23P17/00
    • PROBLEM TO BE SOLVED: To improve a residual stress in a pipe inner surface by generating collapse of grown cavitation foam in the pipe inner surface when applying water jet peening to the pipe inner surface.
      SOLUTION: The method is carried out by holding a pipe having openings at both ends with a holding device, blocking one end of the pipe, inserting an ejection nozzle from the other pipe end, and ejecting a liquid supplied to the ejection nozzle into the pipe inside from the ejection nozzle at an inclination of 9° or less with respect to an axis center of the pipe, to thereby generate back-flow of the liquid ejected from the ejection nozzle, in the pipe inside. Thus, the residual stress in the pipe inner surface is improved by impact pressure caused by collapse of the cavitation foam accompanying the liquid. A collision distance from a nozzle ejection hole to the pipe inner surface is set to a value equal to a distance of growth of the cavitation, and the grown cavitation is collided against the pipe inner surface. As a result, the impact pressure generated at the collapsing of the cavitation can be applied to the pipe inner surface, and therefore the residual stress in the pipe inner surface can be improved.
      COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:通过在管内表面上施加水喷射喷丸时,通过在管内表面中产生塌陷而改善管内表面中的残余应力。 解决方案:该方法通过用保持装置在两端保持具有开口​​的管道进行,阻塞管的一端,从另一管端插入喷嘴,并喷射供应到喷嘴的液体 相对于管的轴心以9°以下的倾斜从喷嘴喷入到管内,从而在管内部产生从喷嘴喷出的液体的回流。 因此,通过伴随液体的气蚀泡沫的崩溃引起的冲击压力,管内表面中的残余应力得到改善。 从喷嘴喷射孔到管内表面的碰撞距离被设定为等于空化生长距离的值,并且生长的气蚀与管内表面相撞。 结果,可以在管内表面上施加在空化崩溃时产生的冲击压力,因此能够提高管内表面的残留应力。 版权所有(C)2011,JPO&INPIT
    • 3. 发明专利
    • Underwater welding apparatus
    • 水下焊接设备
    • JP2011147964A
    • 2011-08-04
    • JP2010011296
    • 2010-01-21
    • Bab-Hitachi Industrial Coバブ日立工業株式会社
    • NITTA KAZUAKINAGATANI NARIKIUNNO SHOICHIKUROSAWA KOICHITANAKA MASAAKIOMORI SHINYA
    • B23K9/29B23K9/00
    • PROBLEM TO BE SOLVED: To shorten the water-discharging time and the drying time, to improve the reliability of discharging water, and to enable the welding of high quality in a welding method in which a torch is miniaturized and simplified, and the welding is executed with a fore end of an arc electrode being under the in-air environment.
      SOLUTION: In an underwater welding apparatus for executing the welding in an underwater environment while locally being in-air environment, a gas-jetting groove (74) is formed in an outer circumference of a torch body (73) mounted on an underwater welding head and using an insulator; the torch body (73) is covered with a metallic cover (79); an arc electrode (23), a wire nozzle (22), a camera (9), and one or a plurality of lights (13) are arranged on the torch body (73); these components are integrated with each other; and a torch structure is miniaturized. In the torch structure, a heat-resistant and elastic absorbent material is provided on a fore end of the torch body (73) between a supporting member equipped with a closed-cell type, expandable and flexible shield member and a fore end of the torch body (73).
      COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:为了缩短排水时间和干燥时间,提高排水的可靠性,并且能够在割炬小型化和简化的焊接方法中实现高质量的焊接,以及 在电弧电极的前端处于空中环境下进行焊接。 解决方案:在水下环境中执行水下环境的水下焊接装置中,当局部处于空中环境时,气体喷射槽(74)形成在安装在燃烧器的火炬体(73)的外周上 水下焊头和使用绝缘子; 割炬本体(73)被金属盖(79)覆盖; 在割炬本体(73)上设有电弧电极(23),电线喷嘴(22),相机(9)和一个或多个灯(13)。 这些组件相互整合; 火炬结构小型化。 在割炬结构中,在装配有闭孔型,可扩张和柔性屏蔽构件的支撑构件和手电筒的前端之间,在炬体(73)的前端上设置耐热弹性吸收材料 身体(73)。 版权所有(C)2011,JPO&INPIT