EP 0218354 A1 19870415 - High pressure water shot peening.

Title (en)

High pressure water shot peening.

Title (de)

Strahlverfestigung mit Hochdruckwasser.

Title (fr)

Grenaillage d'écrouissage au moyen d'eau à haute pression.

Publication

EP 0218354 A1 19870415 (EN)

Application

EP 86306633 A 19860828

Priority

US 77413085 A 19850909

Abstract (en)

High pressure water shot peening is used to process the surface of metallic material, regardless of the surface configuration. By impacting the surface with a supersonic water jet for a predetermined minimum time dependent on the feed rate, the surface is cleaned and decontaminated. When the jet is directed against the inner surface of a tubular member at 2200-2800 ft./sec. for a predetermined dwell time in the range of 0.3 to 0.6 seconds, in./min. a compressive stress is induced in the surface which increases the local micro-hardness of the material. When the jet is impacted against the surface at a velocity in this range, using a self-rotating peener as illustrated, the induced stress is of sufficient magnitude to reduce the susceptibility of the surface to stress corrosion cracking.

IPC 1-7

C21D 7/06; B08B 9/02; B08B 3/02

IPC 8 full level

C21D 7/02 (2006.01); B05B 3/06 (2006.01); B08B 3/02 (2006.01); B08B 9/032 (2006.01); B24C 1/10 (2006.01); B24C 5/00 (2006.01); C21D 7/06 (2006.01)

CPC (source: EP)

B05B 3/06 (2013.01); B08B 3/028 (2013.01); C21D 7/06 (2013.01); B08B 2230/01 (2013.01)

Citation (search report)

[X] DE 2111445 A1 19720921 - ERDMANN JESNITZER FRIEDRICH PR
[X] CH 275352 A 19510531 - L & H ROSENMUND VORM LOUIS ROS [CH]
[X] US 3987963 A 19761026 - PACHT AMOS
[A] FR 2551996 A1 19850322 - ELECTRICITE DE FRANCE [FR]
[A] BE 883798 A 19801001 - SMET KAREL I C
[A] METALWORKING PRODUCTION, vol. 109, no. 34, 25th August 1965, page 53, London, GB; R.E. LAYTON: "Internal shot peening"
[A] DER NEUERER, vol. 15, no. 4, 1966, page 161: "Wasser verfestigt Stahl"

Designated contracting state (EPC)

BE CH FR GB IT LI SE

DOCDB simple family (publication)

EP 0218354 A1 19870415; EP 0218354 B1 19901107; ES 2001668 A6 19880601; JP S6263614 A 19870320

DOCDB simple family (application)

EP 86306633 A 19860828; ES 8601699 A 19860905; JP 20978286 A 19860908