EP4347182A1 - Procede de decoupe non debouchant par jet haute pression pour un corps de propulseur charge - Google Patents
Procede de decoupe non debouchant par jet haute pression pour un corps de propulseur chargeInfo
- Publication number
- EP4347182A1 EP4347182A1 EP22722312.0A EP22722312A EP4347182A1 EP 4347182 A1 EP4347182 A1 EP 4347182A1 EP 22722312 A EP22722312 A EP 22722312A EP 4347182 A1 EP4347182 A1 EP 4347182A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- water jet
- blind
- cut
- starting
- 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
Classifications
-
- 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
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
- B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
- F42B33/06—Dismantling fuzes, cartridges, projectiles, missiles, rockets or bombs
- F42B33/062—Dismantling fuzes, cartridges, projectiles, missiles, rockets or bombs by high-pressure water jet means
Definitions
- the invention relates to the thrusters of an aerospace transport vehicle, and more particularly to a process for cutting a thruster body by high pressure jet, the cutting being carried out in a blind manner.
- Figure 1 which shows a schematic sectional view of a known thruster body 1
- the body has the general shape of a cylinder closed at each axial end by a domed cover 2.
- Each cover 2 has a plug 3
- the plug is inserted into an orifice provided in the cover and delimited by a shoulder 4 over its entire circumference, the shoulder extending axially projecting towards the inside of the body of the propellant.
- the geometry of the thruster bodies used as illustrated in Figure 1 is not adapted to the draining means used. Indeed, the presence of the re-entrant bottoms formed by the annular shoulder 4 can, on the one hand, generate a puddle of water which will alter the quality of the emptying, and on the other hand, hinder the evacuation of the residues of propellant from emptying.
- the rear cover can be opened by high pressure water jet cutting. But, the cutting must not alter the propellant contained in the propellant. If cutting by abrasive water jet is very widespread throughout the world, non-emergent machining or non-emergent cutting are very little developed scientifically and almost non-existent industrially.
- Blind cutting processes in one or more passes are known which attempt to reduce the variability in depth of the blind cut by multiplying these passes.
- the main purpose of the present invention is therefore to propose a solution making it possible to cut only the body of a propellant of an aerospace vehicle, without altering the propellant contained inside the propellant in order to simplify the process for emptying a propellant known.
- a blind cutting method by water jets of a body of a thruster of an aerospace vehicle comprising a plurality of passages of a water jet at high pressure along a same cutting path traversing the outer perimeter of the thruster body, the cutting path describing a closed loop circuit, and each passage of the water jet starting from a starting point located on the path cutting and stopping just after returning to the starting location.
- the starting point of each high pressure water jet passage is different from the starting points of the other water jet passages.
- the use of high-pressure water jet cutting makes it possible to have a clean cutting quality (without delamination of the composite) and without significant heating as could be encountered by mechanical cutting for example.
- the cutting by water jets in several passes according to the invention makes it possible to manage the transition phases more easily, otherwise says the phase of the cutting pass during which the water jet returns to its starting point and thereby generates a deeper cut than on the rest of the path for this same pass.
- the jet must return to where it has already passed in order to close the cut. By going back over an existing cutting line, the depth obtained locally is doubled compared to the rest of the path traveled during this same cutting pass.
- the water jet cutting process according to the invention thus makes it possible to carry out a cut in a plurality of passes, or passages, by shifting on each pass, the singularity due to the closing of the path.
- At least the first passage of the high-pressure water jet can use an abrasive water jet.
- Thruster bodies are generally made up of a stack of several different materials: cork on the outside forming an external thermal protection (ETP), then a composite material structure, then an internal elastomer thermal protection (PTI and peeling skin).
- ETP external thermal protection
- PTI internal elastomer thermal protection
- the body of the propellant having inside the propellant.
- an abrasive water jet at the start of the cutting process, that is to say for the first pass or passes of the high pressure water jet, makes it possible to start the cutting properly, in particular to cut the layer made of composite material which is generally harder than the other layers.
- the use of an abrasive water jet makes it possible to produce a cut without creating delamination or loosening of the fiber.
- at least the last passage of the high-pressure water jet can use a jet of pure water.
- the use of a jet of pure water for the last passage(s) makes it possible to reduce the risks of pollution of the materials to be treated.
- the pure water jet can be used after several passes with an abrasive water jet, especially after the layers of hard material, such as composite materials, have been cut.
- the pure water jet can be used in particular to cut an elastomer layer without risk of water pollution.
- the method can also comprise, on each passage of a water jet, a step for detecting the end of the cut in order to control the depth of the cut at any time and avoid altering the material contained in the propellant.
- the step of detecting the end of cutting may comprise the application of a traction force to a part of the propellant body located on one side of the cutting path, and, if said towed part is moved relative to the other part, an indication of the end of cutting.
- the method thus comprises a step of tensioning the cut-out zone, during each passage, or between the passages, in particular the last passages, in order to directly assess how many passages are sufficient.
- the use of the method according to the invention combining the offset of the starting point of each cutting pass, the use of an abrasive water jet for said at least one first pass and the use of a of pure water for said at least one last pass, and an end-of-cutting detection makes it possible to maximize the safety and efficiency of the cutting process of a propellant body making it possible to avoid altering the content of the body of thruster.
- the thruster body to be cut may have the shape of a cylinder closed at its two axial ends by outwardly domed cowls, the body comprising a multilayer wall comprising a stack of the outside towards the inside of an external thermal protection layer, of a composite material layer, and of an internal thermal protection layer, and the domed covers also having an elastomer skin intended to be in contact fuel contained in the body and separated from the internal thermal protection layer by a gap, and the non-emerging cutting method may include a step of centering the cutting path on a curved cover, the cutting being carried out until the space between the elastomer skin and the thermal protection layer is reached internal.
- the cutout To prevent the contents of the propellant from being altered, generally the propellant, the cutout must be non-emerging. And so that the cutout is sufficient to remove the cover and allow access to the propellant without the risk of altering the propellant, the cutout stops in the gap, that is to say in the space existing between the skin made of elastomer and the internal protective layer which is generally also made of elastomer.
- the method according to the invention thus provides a solution making it possible to cut only the external thermal protection (ETP), the composite structure and the internal thermal protection (PTI) of a thruster body of an aerospace vehicle, without altering the propellant. contained inside the thruster.
- ETP external thermal protection
- PTI internal thermal protection
- FIG. 1 Figure 1, already shown, schematically shows a sectional view of a known thruster.
- Figure 2 shows a flowchart of a non-emerging method of cutting a propellant body according to one embodiment of the invention.
- Figure 2 is presented a flowchart of a blind cutting process by water jets of a propellant body of an aerospace vehicle according to an embodiment of the invention.
- the thruster body of the aerospace vehicle to be cut may have the shape of a cylinder closed at its two axial ends by cowls that bulge outwards.
- the body comprises a multilayer wall comprising a stack, from the outside of the body towards the inside of the body, of a thermal protection layer external, a layer of composite material, and an internal thermal protection layer.
- the domed cowls also have an elastomer skin intended to be in contact with the fuel contained in the body and separated from the internal thermal protection layer by a space.
- the cutout must be non-emerging.
- the cutout is sufficient to remove the cover and allow access to the propellant without risking altering the propellant, it is preferable that the cutout stops in the gap, that is to say in the space existing between the elastomer skin and the internal protective layer which is generally also made of elastomer.
- the method according to the invention comprises, first of all, a first step 200 of centering the cutting path on a curved cover during which the cutting water projection system is centered opposite the starting point of the cutting of the thruster body to be cut.
- the method comprises a pass of a first cut, the first cut being made using an abrasive water jet, and the pass being made over the entire outer circular perimeter of the cylindrical body.
- an abrasive water jet at the start of the cutting process, that is to say for the first pass or passes of the high pressure water jet, makes it possible to start the cutting properly, in particular to cut the layer made of composite material which is generally harder than the other layers.
- the use of an abrasive water jet makes it possible to cut without creating delamination or loosening of the fiber.
- the method comprises a third step 220 in which the number of passes of the first cut made, that is to say of the cut by abrasive water jet, is compared with a threshold of first cut passes.
- the second and third steps 210 and 220 are repeated.
- the method performs, in a fourth step 230, a pass of a second cut using a jet of pure water.
- a jet of pure water for the last passage(s) makes it possible to reduce the risks of pollution of the materials to be treated.
- the pure water jet can be used after several passes with an abrasive water jet, especially after the layers of hard material, such as composite materials, have been cut.
- the pure water jet can be used in particular to cut an elastomer layer without risk of water pollution.
- Each pass of first or second cutting is carried out on the entire circular perimeter of the thruster body. And each pass, that is to say each passage, of a pure water jet or an abrasive water jet, is carried out by projecting a high pressure water jet along the same cutting path running along the outer perimeter of the thruster body.
- each water jet pass abrasive or pure, starts from a starting point located on the cutting path and stops just after passing back over the starting location.
- the path traveled by the water jet on each pass is therefore longer than the closed loop formed by the cutting path, in other words longer than the circular perimeter of the body.
- each high-pressure water jet pass pure or abrasive, is therefore different from the starting points of the other water jet passes, whether they are front or back passes.
- the method carries out, in a fifth step 240, a detection of the end of cutting of the cover of the body.
- the step of detecting the end of the cut comprises in this example the application of a traction force on a part of the thruster body located on one side of the cutting path, and, if the said towed part is moved relative to the other part, an indication of the end of cutting in a last step 250, since it reflects the fact that the cutting has reached the space separating the elastomer skin and the internal thermal protection layer.
- the method according to the invention thus provides a solution making it possible to cut only the external thermal protection (ETP), the composite structure and the internal thermal protection (PTI) of a thruster body of an aerospace vehicle, without altering the propellant. contained inside the thruster.
- ETP external thermal protection
- PTI internal thermal protection
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2105648A FR3123242B1 (fr) | 2021-05-31 | 2021-05-31 | Procédé de découpe non débouchant par jet haute pression pour un corps de propulseur chargé |
| PCT/FR2022/050703 WO2022254105A1 (fr) | 2021-05-31 | 2022-04-14 | Procede de decoupe non debouchant par jet haute pression pour un corps de propulseur charge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4347182A1 true EP4347182A1 (fr) | 2024-04-10 |
| EP4347182B1 EP4347182B1 (fr) | 2025-06-18 |
Family
ID=78086414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22722312.0A Active EP4347182B1 (fr) | 2021-05-31 | 2022-04-14 | Procédé de découpe non débouchante par jet haute pression pour un corps de propulseur |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US12109668B2 (fr) |
| EP (1) | EP4347182B1 (fr) |
| KR (1) | KR102689293B1 (fr) |
| FR (1) | FR3123242B1 (fr) |
| IL (1) | IL308664B2 (fr) |
| WO (1) | WO2022254105A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4440208A1 (de) * | 1994-11-10 | 1996-05-15 | Alba Ind & Umweltschutzservice | Verfahren und Vorrichtung zum Zerschneiden eines Körpers aus festen Explosivstoffen, insbesondere Composite-Raketentreibstoffen |
| WO2004106841A2 (fr) * | 2003-05-23 | 2004-12-09 | Gradient Technology | Procede d'acces a des munitions par jet de fluide |
| GB0807964D0 (en) * | 2008-05-02 | 2008-06-11 | Rolls Royce Plc | A method of fluid jet machining |
| US8371903B2 (en) * | 2008-12-02 | 2013-02-12 | G.D.O. Inc. | Portable demilitarization apparatus for segmenting ordnance |
| US9891617B2 (en) * | 2014-01-22 | 2018-02-13 | Omax Corporation | Generating optimized tool paths and machine commands for beam cutting tools |
| IT201600114272A1 (it) * | 2016-11-11 | 2018-05-11 | Exergy Spa | Metodo per la costruzione di elementi statorici e rotorici di turbomacchine |
-
2021
- 2021-05-31 FR FR2105648A patent/FR3123242B1/fr active Active
-
2022
- 2022-04-14 WO PCT/FR2022/050703 patent/WO2022254105A1/fr not_active Ceased
- 2022-04-14 KR KR1020237043816A patent/KR102689293B1/ko active Active
- 2022-04-14 IL IL308664A patent/IL308664B2/en unknown
- 2022-04-14 EP EP22722312.0A patent/EP4347182B1/fr active Active
- 2022-04-14 US US18/563,171 patent/US12109668B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3123242A1 (fr) | 2022-12-02 |
| IL308664B2 (en) | 2025-11-01 |
| IL308664A (en) | 2024-01-01 |
| EP4347182B1 (fr) | 2025-06-18 |
| US20240261934A1 (en) | 2024-08-08 |
| KR20240001328A (ko) | 2024-01-03 |
| KR102689293B1 (ko) | 2024-07-30 |
| IL308664B1 (en) | 2025-07-01 |
| US12109668B2 (en) | 2024-10-08 |
| WO2022254105A1 (fr) | 2022-12-08 |
| FR3123242B1 (fr) | 2023-06-02 |
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