Water jet peening method and device therefor

ウオータージェットピーニング方法及び装置

Abstract

PURPOSE: To improve the tensile residual stress of metal material by vibrating a nozzle at high-frequency in water, generating a vibration-induced cavity near the nozzle wall surface and colliding the vibration-induced cavity against the surface of the metal material by high-speed injected water stream including the cavity. CONSTITUTION: In a water jet peening method for reducing the surface tensile residual stress of the metal material by colliding the high speed injected water stream including the cavity against the surface of the metal material dipped in the water from a nozzle 3 provided with an orifice part for accelerating the flow speed and a horn-like injection hole followed to the orifice in the water, the high-frequency vibration is applied to the nozzle to vibrate it and the vibrating induced cavity is generated near the nozzle wall surface, and the above vibration-induced cavity is collided against the surface of the metal material by the high speed injected water stream including the cavity. COPYRIGHT: (C)1993,JPO&Japio
(57)【要約】 【目的】 水中にてノズルを高周波振動させ、ノズル壁 面近傍に振動誘起キャビティを生成せしめ、キャビティ を内包する高速の噴射水流により前記振動誘起キャビテ ィを金属材料の表面に衝突させて、金属材料の引張残留 応力を改善する。 【構成】 水中において、流速増速用オリフィス部及び それに続くホーン状噴出孔を備えたノズルから、キャビ ティを内包する高速の噴射水流を、水中に浸漬されてい る金属材料の表面に衝突させることにより、金属材料の 表面引張残留応力を低減するウオータージェットピーニ ング法において、前記ノズルに高周波振動を与えて振動 させ、ノズル壁面近傍に振動誘起キャビティを生成せし め、前記キャビティを内包する高速の噴射水流により、 前記振動誘起キャビティを金属材料の表面に衝突させ る。

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Cited By (6)

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    JP-2014151409-AAugust 25, 2014Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社Method, device and facility for testing compressive residual stress after water jet peening processing
    JP-H08226992-ASeptember 03, 1996Hitachi Ltd, 株式会社日立製作所原子炉構造物の残留応力改善方法及びその残留応力改善装置
    US-5553106-ASeptember 03, 1996Hitachi, Ltd., Babcock-Hitachi Kabushiki KaishaResidual stress improving method for members in reactor pressure vessel
    US-6639962-B2October 28, 2003Hitachi, Ltd., Hitachi Engineering Co., Ltd., Hitachi Ibaraki Business Engineering Co., Ltd.Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel
    US-9739695-B2August 22, 2017Mitsubishi Heavy Industries, Ltd.Water jet peening compressive residual stress test method, test device, and test facility
    WO-2014126039-A1August 21, 2014三菱重工業株式会社Water jet peening compressive residual stress test method, test device, and test facility