EP1568442B1 - Verfahren zur Strahlverfestigung und Strahldüse dazu - Google Patents

Verfahren zur Strahlverfestigung und Strahldüse dazu Download PDF

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Publication number
EP1568442B1
EP1568442B1 EP05290391A EP05290391A EP1568442B1 EP 1568442 B1 EP1568442 B1 EP 1568442B1 EP 05290391 A EP05290391 A EP 05290391A EP 05290391 A EP05290391 A EP 05290391A EP 1568442 B1 EP1568442 B1 EP 1568442B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
section
cavity
shot
ejection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP05290391A
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English (en)
French (fr)
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EP1568442A1 (de
Inventor
François Archer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Filing date
Publication date
Priority claimed from FR0401878A external-priority patent/FR2866586B1/fr
Application filed by Individual filed Critical Individual
Publication of EP1568442A1 publication Critical patent/EP1568442A1/de
Application granted granted Critical
Publication of EP1568442B1 publication Critical patent/EP1568442B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B24C3/327—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor

Definitions

  • the invention relates to a shot peening method of wall prestressing a cavity.
  • Preload shot peening is a surface treatment that increases the mechanical endurance of parts subject to dynamic loading. This increase in endurance is obtained by compressing the surface which avoids or delays the appearance or propagation of cracks. Compression is caused by the bombardment of the surface to be treated, for example by shot or hard micro-balls which create a superficial plastic deformation, itself generating the creation of sub-layer compression stresses.
  • the shot is sucked up and suspended in a flow of air or pulsed gas at high speed to increase its kinetic energy at the outlet of a nozzle, or projected by a turbine, which is perfectly suitable for the treatment an outer surface, the angle of incidence of the jet containing the shot can be chosen to obtain an appropriate angle of impact on the surface to be treated.
  • baffles located at the end of the ejection nozzle mounted at the end of a lance penetrating into the cavity to be treated or moving targets (that is to say obstacles of appropriate shape located on the path of the gas inside the cavity to be treated) to deflect the shot towards the walls.
  • a method according to the preamble of claim 1 is described in the document GB 1236205 .
  • the present invention aims to provide a simple and economical solution to the problems posed by the implementation of previously known means. It consists of a shot blasting process according to claim 1.
  • the ejection end of the nozzle is disposed facing and near the entrance of the cavity to be treated. Due to turbulent flow, the shot particles have totally random trajectories, most of which become incidental to the surface to be treated. We thus have broken trajectories perfectly impacting this surface, and producing the expected result, that is to say, putting it into compression all along the flow path. In addition these trajectories broken, during rebounds on the walls, contribute to the maintenance of turbulence along the entire length of the flow path inside the cavity.
  • the device comprises a known type of shot blasting nozzle, extended by an ejection tip whose inner shape locally modifies the passage section of the gas stream containing the shot in suspension .
  • the changes in velocity and pressure gradient in this zone of the ejection tip produce the separation of the gaseous layers and render the flow turbulent, to obtain the result previously described.
  • the nozzle comprises a pipe for the arrival of the mixture, followed by an ejection section of increasing section which corresponds to a simple embodiment and limiting the wear, the implementation turbulence progressively going towards the exit.
  • the feed pipe of the mixture is cylindrical and the ejection section is conical divergent.
  • the angle of the generatrix of the cone is between 15 ° and 45 °; other values would not change the scope of the invention.
  • the ejection outlet section is identical to the input section of the cavity to be treated.
  • the ratio of the sections between the gas supply pipe and the outlet of the ejection zone is between 0.25 and 0.45.
  • Figure 1 is a sectional view of an ejection nozzle according to a preferred embodiment for carrying out the method according to the invention.
  • FIG. 1 The embodiment described in FIG. 1 is intended to allow the interchangeability of the ejection zones by reducing the cost price of the device.
  • the inlet opening 10 of the blast cavity is placed in front of the outlet 6 of the ejection zone 4.
  • An additional piece 11 can be added in the nozzle 1, with a bore 12 to allow the standard inlet section 13 of the nozzle 1 to be passed to the section of the inlet pipe 9 of the nozzle 3.
  • the fluid previously loaded with grit is admitted into the pipe 9 in a substantially laminar regime. From its entry into the ejection zone 4, the variation of the section causes the turbulence of the flow, which in this way penetrates into the cavity 10, causing effective blasting of its walls, that is to say with random and incident shot trajectories on the surface of this cavity 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Cleaning In General (AREA)

Claims (1)

  1. Verfahren zum Vorspannungs-Kugelstrahlen von Innenwänden eines Hohlraums mit einem im Wesentlichen laminaren Gasstrom, der das Strahlmittel im stromaufwärtigen Kanal (9) einer Düse (1) befördert und im Ausstoßbereich (4) der Düse (1) in eine turbulente Strömung umgewandelt wird und in die Öffnung (10) des zu behandelnden Hohlraums geleitet wird, dadurch gekennzeichnet, dass die Turbulenzenerzeugung so nahe wie möglich am Ausgang der Düse (1) und am Eingang (10) des zu behandelnden Hohlraums erfolgt.
EP05290391A 2004-02-25 2005-02-22 Verfahren zur Strahlverfestigung und Strahldüse dazu Active EP1568442B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR0401878 2004-02-25
FR0401878A FR2866586B1 (fr) 2004-02-25 2004-02-25 Procede de grenaillage de precontrainte de parois interieures de corps creux et dispositif de mise en oeuvre
FR0500468 2005-01-17
FR0500468A FR2866587B1 (fr) 2004-02-25 2005-01-17 Dispositif de buse de grenaillage

Publications (2)

Publication Number Publication Date
EP1568442A1 EP1568442A1 (de) 2005-08-31
EP1568442B1 true EP1568442B1 (de) 2007-11-21

Family

ID=34751808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05290391A Active EP1568442B1 (de) 2004-02-25 2005-02-22 Verfahren zur Strahlverfestigung und Strahldüse dazu

Country Status (4)

Country Link
EP (1) EP1568442B1 (de)
DE (1) DE602005003382T2 (de)
ES (1) ES2297642T3 (de)
FR (1) FR2866587B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2905290B1 (fr) * 2006-09-05 2009-07-03 Renault Sas Dispositif de traitement pour le grenaillage de la surface interieure d'une piece tubulaire

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH131161A (de) * 1927-02-24 1929-01-31 Rhein Ruhr Maschinenvertrieb D Düse für Sandstrahlgebläse.
AU2385170A (en) * 1969-12-29 1972-07-06 Norton Company Abrasive blasting nozzle
US5484325A (en) * 1993-10-07 1996-01-16 Church & Dwight Co., Inc. Blast nozzle containing water atomizer for dust control
US5975996A (en) * 1996-07-18 1999-11-02 The Penn State Research Foundation Abrasive blast cleaning nozzle
WO2003002303A1 (en) * 2001-06-13 2003-01-09 Huibert Konings Nozzle for treatment of surfaces with cryogenic particles

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082073A (en) * 1961-04-20 1963-03-19 Trunkline Gas Company Method of increasing efficiency of pipelines
GB1236205A (en) * 1967-08-17 1971-06-23 Abrasive Dev Improvements in or relating to abrading
WO1998013470A1 (en) * 1996-09-25 1998-04-02 Powderject Vaccines, Inc. Gas-driven particle delivery device
US6280302B1 (en) * 1999-03-24 2001-08-28 Flow International Corporation Method and apparatus for fluid jet formation
GB2372718B (en) * 2001-01-04 2004-07-14 Workinter Ltd Nozzle intended for the concentrated distribution of a fluid for scouring of surfaces
US6739956B2 (en) * 2001-10-30 2004-05-25 Valiant Corporation Apparatus for cleaning engine block passages

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH131161A (de) * 1927-02-24 1929-01-31 Rhein Ruhr Maschinenvertrieb D Düse für Sandstrahlgebläse.
AU2385170A (en) * 1969-12-29 1972-07-06 Norton Company Abrasive blasting nozzle
US5484325A (en) * 1993-10-07 1996-01-16 Church & Dwight Co., Inc. Blast nozzle containing water atomizer for dust control
US5975996A (en) * 1996-07-18 1999-11-02 The Penn State Research Foundation Abrasive blast cleaning nozzle
WO2003002303A1 (en) * 2001-06-13 2003-01-09 Huibert Konings Nozzle for treatment of surfaces with cryogenic particles

Also Published As

Publication number Publication date
DE602005003382D1 (de) 2008-01-03
FR2866587A1 (fr) 2005-08-26
DE602005003382T2 (de) 2008-09-25
FR2866587B1 (fr) 2007-03-16
EP1568442A1 (de) 2005-08-31
ES2297642T3 (es) 2008-05-01

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