EP1568442A1 - Procédé de grenaillage de précontrainte et buse d'éjection pour sa mise en oeuvre - Google Patents
Procédé de grenaillage de précontrainte et buse d'éjection pour sa mise en oeuvre Download PDFInfo
- Publication number
- EP1568442A1 EP1568442A1 EP05290391A EP05290391A EP1568442A1 EP 1568442 A1 EP1568442 A1 EP 1568442A1 EP 05290391 A EP05290391 A EP 05290391A EP 05290391 A EP05290391 A EP 05290391A EP 1568442 A1 EP1568442 A1 EP 1568442A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shot
- nozzle
- ejection
- cavity
- gas
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title claims description 6
- 238000005422 blasting Methods 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 3
- 238000005480 shot peening Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 230000001131 transforming effect Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 235000021183 entrée Nutrition 0.000 description 3
- 230000003116 impacting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 208000031968 Cadaver Diseases 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Images
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 method for blasting wall prestressing a cavity and the gas discharge nozzles charged with shot for carrying out the process
- Shot peening is a surface treatment to increase the mechanical endurance of parts subjected to dynamic stresses. This endurance increase is achieved 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-beads that create a superficial plastic deformation, itself generating the creation of sub-layer compression constraints.
- the shot is sucked and suspended in a stream of air or pulsed gas at high speed to increase its output kinetic energy a nozzle, or projected by a turbine, which is perfect for the treatment outer surface, the angle of incidence of the jet containing the shot may be chosen to obtain an appropriate impact angle on the surface to be treated.
- deflectors located at the end of the ejection nozzle mounted at the end of a lance penetrating the cavity to be treated that is moving targets (that is, properly shaped obstacles located on the trajectory of the gas inside the cavity to be treated) to deflect the shot towards the walls.
- 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 peening process using a gas flow loaded with shot, reconditioned turbulent flow at the outlet of the ejection nozzle before entering the cavity the walls are to be treated, so that the trajectories of the particles of shot are random and therefore incidental to the surface of these walls.
- a device nozzle particularly simple, economic realization, and little wear allows its industrial implementation.
- the prestressing shot blasting process consists in projecting inside the cavity whose walls are to be treated, a turbulent flow of gas charged with shot. This flow is projected through a nozzle, the mixture of gas and shot being made upstream of the latter during suction, the turbulence being performed as close to the outlet of the nozzle and the entrance into the cavity to be treated.
- the ejection end of the nozzle is disposed facing and near the entrance of the cavity. treat. Due to the turbulent flow, the particles of shot have trajectories totally random, most of which become incidental to the surface to be treated. We have broken trajectories impacting this surface perfectly, and producing the expected result, that is to say its compression in all the flow path. Moreover these broken trajectories, during rebounds on the walls, contribute to the maintenance of turbulence along the entire length of the flow path inside the cavity.
- the device according to the invention consists of a nozzle of shot blasting of known type, extended by an ejection tip whose inner shape locally modifies the passage section of the gas vein containing the shot into suspension.
- the changes in speed and pressure gradient in this area of the mouthpiece of ejection produce the detachment of the gaseous layers and make the flow turbulent, to obtain the result previously described.
- the nozzle according to the invention, it comprises a inlet pipe of the mixture, followed by an ejection section of increasing section which corresponds to a simple embodiment and limiting the wear, the setting turbulence progressively going towards the exit.
- the arrival pipe of the mixture is cylindrical and the ejection section is conical divergent.
- the angle of the generator of the cone is understood between 15 ° and 45 °; other values would not change the scope of the invention.
- the ejection exit section is identical to the section input of the cavity to be treated.
- the ratio of the sections between the the gas supply line and the outlet of the ejection zone is between 0.25 and 0.45.
- FIG. 1 is a sectional view of an ejection nozzle according to an embodiment preferential for the implementation of the method according to the invention.
- FIG. 1 The embodiment described in FIG. 1 is intended to allow interchangeability ejection zones by decreasing the cost price of the device.
- the inlet opening 10 of the shot blast cavity is placed in front of the outlet 6 of the zone ejection 4.
- An additional piece 11 can be added in the nozzle 1, with a bore 12 for allow to pass the standard inlet section 13 of the nozzle 1 to the section of the pipe 9 inlet of the nozzle 3.
- the fluid previously loaded with shot is admitted into line 9 in steady state substantially laminar. From its entry into the ejection zone 4, the variation of section causes a turbulence of the flow, which enters this way 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nozzles (AREA)
- Cleaning In General (AREA)
Abstract
Description
- Dans un alésage de diamètre réduit, ils créent une obstruction qui en limitant le débit de grenaille augmente le temps de traitement (nonobstant le fait qu'au dessous d'une certaine section à traiter il n'est plus possible d'introduire une lance ou une cible dans la cavité, particulièrement si celle-ci est longue ou courbée).
- La déviation du jet use considérablement la lance ou la cible (bien que réalisées avec des matériaux très durs et coûteux) tout en absorbant une grande partie de l'énergie cinétique destinée au traitement de la pièce entrainant une surconsommation d'énergie.
- La grenaille est détériorée par la cible ou le déflecteur autant que par la surface à traiter, réduisant sa durée de vie.
- la première est la possibilité d'une usure plus importante dans cette zone, permettant de changer l'embout sans changer le corps de buse.
- la seconde est de pouvoir changer l'embout en fonction de la section d'entrée de la cavité à traiter.
- un embout 3 , comportant la zone d'éjection 4 de section croissante entre son entrée 5 du fluide chargé de grenaille (dont le sens de circulation est figuré par la flèche 7) et sa sortie 6. Sur cet exemple, la zone d'éjection est un cône de section divergente.
- une pièce 8,comportant une canalisation 9, de section identique à la section d'entrée 5 de la zone d'éjection 4 pratiquée dans l'embout 3. Sur cet exemple, la canalisation 9 est cylindrique
Claims (6)
- Procédé de grenaillage de précontrainte de parois intérieures d'une cavité, caractérisé en ce que un flux de gaz sensiblement laminaire transportant de la grenaille dans la canalisation 9 d'une buse 1 est transformé en flux turbulent dans la zone d'éjection 4 de cette buse et dirigé dans l'ouverture 10 de la cavité à traiter.
- Dispositif de buse pour la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce que la canalisation 9 d'arrivée du gaz chargé de grenaille est prolongée par une zone d'éjection 4 de section croissante dans le sens de circulation 7 de ce fluide.
- Dispositif de buse d'éjection de gaz chargé de grenaille selon la revendication 2 caractérisé en ce que la zone d'éjection 4 est conique.
- Dispositif de buse d'éjection de gaz chargé de grenaille selon la revendication 2 caractérisé en ce que la zone d'éjection 4 est réalisée dans un embout 3 démontable par rapport au corps de la buse d'éjection 1.
- Dispositif de buse d'éjection de gaz chargé de grenaille selon la revendication 2 caractérisé en ce que la surface de la sortie 6 de la zone d'éjection 4 est identique à la surface de l'ouverture d'entrée (10) de la cavité à traiter.
- Dispositif de buse d'éjection de gaz chargé de grenaille selon la revendication 2 caractérisé en ce que la canalisation d'arrivée 9 du gaz dans la zone d'éjection 4 est cylindrique.
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 |
| FR0500468A FR2866587B1 (fr) | 2004-02-25 | 2005-01-17 | Dispositif de buse de grenaillage |
| FR0500468 | 2005-01-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1568442A1 true EP1568442A1 (fr) | 2005-08-31 |
| EP1568442B1 EP1568442B1 (fr) | 2007-11-21 |
Family
ID=34751808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05290391A Expired - Lifetime EP1568442B1 (fr) | 2004-02-25 | 2005-02-22 | Procédé de grenaillage de précontrainte et buse d'éjection pour sa mise en oeuvre |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1568442B1 (fr) |
| DE (1) | DE602005003382T2 (fr) |
| ES (1) | ES2297642T3 (fr) |
| FR (1) | FR2866587B1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2905290A1 (fr) * | 2006-09-05 | 2008-03-07 | Renault Sas | Dispositif de traitement pour le grenaillage de la surface interieure d'une piece tubulaire |
Citations (4)
| 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 (fr) * | 1996-09-25 | 1998-04-02 | Powderject Vaccines, Inc. | Dispositif de distribution de particules entrainees par un gaz |
| US20010046833A1 (en) * | 1999-03-24 | 2001-11-29 | Hashish Mohamed A. | Method and apparatus for fluid jet formation |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH131161A (de) * | 1927-02-24 | 1929-01-31 | Rhein Ruhr Maschinenvertrieb D | Düse für Sandstrahlgebläse. |
| DE2064003A1 (fr) * | 1969-12-29 | 1971-07-15 | ||
| 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 |
| GB2372718B (en) * | 2001-01-04 | 2004-07-14 | Workinter Ltd | Nozzle intended for the concentrated distribution of a fluid for scouring of surfaces |
| NL1018280C2 (nl) * | 2001-06-13 | 2002-12-16 | Huibert Konings | Straalelement voor het bewerken van oppervlakken met cryogene deeltjes. |
| US6739956B2 (en) * | 2001-10-30 | 2004-05-25 | Valiant Corporation | Apparatus for cleaning engine block passages |
-
2005
- 2005-01-17 FR FR0500468A patent/FR2866587B1/fr not_active Expired - Fee Related
- 2005-02-22 ES ES05290391T patent/ES2297642T3/es not_active Expired - Lifetime
- 2005-02-22 EP EP05290391A patent/EP1568442B1/fr not_active Expired - Lifetime
- 2005-02-22 DE DE200560003382 patent/DE602005003382T2/de not_active Expired - Lifetime
Patent Citations (4)
| 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 (fr) * | 1996-09-25 | 1998-04-02 | Powderject Vaccines, Inc. | Dispositif de distribution de particules entrainees par un gaz |
| US20010046833A1 (en) * | 1999-03-24 | 2001-11-29 | Hashish Mohamed A. | Method and apparatus for fluid jet formation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2905290A1 (fr) * | 2006-09-05 | 2008-03-07 | Renault Sas | Dispositif de traitement pour le grenaillage de la surface interieure d'une piece tubulaire |
| WO2008029039A3 (fr) * | 2006-09-05 | 2008-05-02 | Renault Sa | Dispositif de traitement pour le grenaillage de la surface interieure d'une piece tubulaire |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602005003382D1 (de) | 2008-01-03 |
| ES2297642T3 (es) | 2008-05-01 |
| FR2866587B1 (fr) | 2007-03-16 |
| EP1568442B1 (fr) | 2007-11-21 |
| FR2866587A1 (fr) | 2005-08-26 |
| DE602005003382T2 (de) | 2008-09-25 |
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