EP1598447A1 - Verfahren und Vorrichtung zum Beizen eines rotationssymmetrischen Hohlkörpers - Google Patents

Verfahren und Vorrichtung zum Beizen eines rotationssymmetrischen Hohlkörpers Download PDF

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Publication number
EP1598447A1
EP1598447A1 EP05291048A EP05291048A EP1598447A1 EP 1598447 A1 EP1598447 A1 EP 1598447A1 EP 05291048 A EP05291048 A EP 05291048A EP 05291048 A EP05291048 A EP 05291048A EP 1598447 A1 EP1598447 A1 EP 1598447A1
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EP
European Patent Office
Prior art keywords
product
tank
pickling
stripping
cavities
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
Application number
EP05291048A
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English (en)
French (fr)
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EP1598447B1 (de
Inventor
Patrick Dechard
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.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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Publication date
Application filed by SNECMA SAS filed Critical SNECMA SAS
Publication of EP1598447A1 publication Critical patent/EP1598447A1/de
Application granted granted Critical
Publication of EP1598447B1 publication Critical patent/EP1598447B1/de
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material

Definitions

  • the invention relates to a method of stripping a part hollow of revolution, especially a hollow part of large dimensions, such as the wheel of a turbine with annular cavities separated by discs welded together.
  • the domain preferred application of the invention relates to the chemical dissolution of the Contaminated layer rich in oxygen, commonly called layer "Alpha-case” which is formed on such a piece of titanium alloy, during the heat treatment thereof.
  • a titanium alloy turbine wheel of the type indicated above is deemed difficult to access internally given the plurality of adjacent annular cavities defined therein between discs, welded together, which constitutes it.
  • Heat treatment necessary for the development of this piece has the consequence of making appear on the surface of it (externally as well as internally) a contaminated layer a few tens of microns thick, rich in oxygen called "alpha-case layer".
  • alpha-case layer a contaminated layer a few tens of microns thick, rich in oxygen
  • the invention proposes a stripping process allowing dissolve the contaminated layer, simultaneously outside as well as inside, making sure that chemical dissolution occurs uniformly.
  • the invention therefore relates to a method of stripping a hollow part of revolution, characterized in that it consists rotate said workpiece about its oriented axis of rotation horizontally, to partially immerse said piece in a tank filled with cleaner so that it penetrates into the interior of said part, to rotate said part during said stripping and to constantly pump the cleaning product into the room while maintaining substantially constant the level of product stripper relative to said piece.
  • the pumped product thus pumped is advantageously reintroduced into the tank outside the room. Since the cavities have different volumes, pumping can be operated in removing the stripping product in these cavities, simultaneously but adjusting the flows between them, substantially in proportion to the respective volumes of these cavities.
  • the piece is extracted from the product bath stripper while continuing the pumping inside thereof.
  • the rotation is preferably continued during the extraction of the workpiece.
  • the extraction of the piece takes place in a relatively short time of the order 30 seconds.
  • the piece is transported to a bath of product neutralizing and diving into it.
  • the rotation is preferably continued during this rinsing phase.
  • the neutralizing product can for example, be water.
  • the removal of the contaminated layer takes place at with the aid of a stripping product consisting, for example, of a mixture nitric acid and hydrofluoric acid.
  • the invention also relates to a pickling plant of a hollow part of revolution, characterized in that it comprises a support equipped with means for gripping and driving in rotation of said part, arranged to hold it and to cause it to rotate around its axis of rotation oriented horizontally, a tank of product stripper, means for lowering said part in said tank and for partially immersing it in said stripper product, means for pumping to continuously remove the remover product inside of said piece and means for maintaining a level substantially constant stripping product relative to said piece.
  • the discharge outlet of the pumping means is arranged to reintroduce the pumped product into the tank, outside the room.
  • the pumping means may comprise several suction ducts plunging respectively in said cavities.
  • suction ducts are flexible ducts communicating with a manifold connected to the same pump. These suction ducts can be have calibrated flow restrictions. In this case the section of each restriction is calculated according to the volume of the cavity in which plunges the corresponding suction duct.
  • the installation may also include a product tank neutralizing and means for transferring the piece of the product tank stripper to the tank of neutralizing product.
  • the installation 11, shown, comprises a support 13 equipped with means for gripping and driving in rotation 17 of a piece hollow of revolution 19 to be stripped.
  • this piece the wheel or central part of a turbojet turbine.
  • This is a piece of complex shape constituted by a plurality of discs 21 welded between them and internally defining coaxial annular cavities 23, adjacent axially, difficult to access.
  • the treatment thermal system to which such a piece of titanium alloy is subjected appear on the surface thereof a commonly contaminated layer called "alpha-case layer" that it is desirable to eliminate. The stripping the inner surface of this piece was so far considered impracticable.
  • the support 13 comprises a kind of gantry 25 carrying at its upper part, attached to a platform 27, all means (motor and electromechanical components) for gripping and the drive in rotation of the part 19. More precisely, an engine electrical 29 causes a support 31 of horizontal axis, carried by a amount 32 extending under the platform 27. The support 31 is driven through a set of pinions 33. This support is consistent and sized to fit an end 36 of the workpiece. Said support 31 is widely openwork not to impede the circulation of a liquid to the interior of the room, in particular a stripping product or a product neutralizing or rinsing. A non-motorized rotating element 37 three arms 38 coming to fit the other end 39 of the room. The element rotating is carried by a vertical amount 41 mounted under the platform 27.
  • the assembly moves axially to allow the installation of the room.
  • Said support 31 and said rotating element 37 admit the same horizontal axis. Once in place, the room is maintained between them being centered by the two circular ends 36 and 39. It can therefore rotate around its own axis of rotation placed in position horizontal.
  • the piece is brought under the gantry 25 being carried by a forklift 46 (FIGS. and 3) and is placed between the support 31 and the arms 38. It can therefore be rotated by the engine 29.
  • the platform 27 also carries a pump 50 whose inlet 51 is connected to a conduit whose end 53 is arranged axially (x'x axis) and connected to a collector 54, rigid and removable, susceptible to be installed axially inside the room, as shown. of the suction ducts 55, flexible, are connected to this manifold 54.
  • Each conduit 55 dips into one of the cavities 23 when the collector 54 and the piece 19 are in place on the support 13, as visible on the Figure 1.
  • the length of a conduit depends on the cavity that corresponds to it so that its lower end is in the vicinity of the wall interior of the room in its most deeply submerged part, that is to say at the bottom of said corresponding cavity.
  • the means of pumping (50, 54, 55) are adapted to continuously take the product stripper inside the room and at the bottom of each cavity, when said part is partially immersed in a tank 59 of product stripper ( Figure 5). If the piece to be stripped was of a different nature and did not include, in particular, several cavities, the suction system to the interior of the room could be simplified and include, for example, only one flexible pipe plunging into the deepest part.
  • a level detector 60 is placed on the gantry and the installation comprises means for adjusting the position of the support 13 (in height) so that said part is partially immersed up to a height predetermined, for example, according to the example, up to its axis of rotation xx '.
  • the support 13 that is to say the gantry itself, which is immersed in the tank.
  • lifting means 61 making by example part of a crane or similar, installed on the site.
  • said lifting means make it possible to adjust the position of the support 13 and by consequent of the piece 19 in the tank; they are for this purpose driven by the level detector 60, which is fixed on the support at a location as it detects the surface of the cleaner bath when the piece is immersed substantially to the x'x axis.
  • Lifting means can be slaved to the detected level, to maintain the level 60 detector on the surface of the cleaner bath.
  • the installation comprises means for maintain a substantially constant level of cleaner product by relative to said piece.
  • the pumping means take stripper product at the bottom of the room
  • the pump 50 is arranged to continuously recycle the paint remover into the tank, outside the 19.
  • a conduit 56 connected to the discharge outlet 52 of the pump plunges into the tank. This recycling makes it possible in practice to maintain the level of stripper product at a constant level in the tank from then on that the support 13 has been immersed in it at a determined depth by the level 60 detector.
  • the cleaner is pumped permanently in the cavities 23 and at the bottom thereof, and then recycled in the tank outside the room, the activity of the cleaner product is maintained homogeneous in all points of the tank.
  • To determine the time of treatment necessary taking into account the activity of the product stripper (which gradually wears out) simply stripping at a specimen having undergone the same heat treatment as the piece and deduce a stripping time for said piece.
  • At least some suction ducts 55 are provided calibrated flow restrictions 65 (upstream of the manifold 54), the section of each restriction being calculated according to the volume of the cavity in which plunges the corresponding suction duct. This keeps the level of cleaning product constant in the room itself, especially at the end of stripping during the time when the said piece is extracted from the tank and continues to be emptied.
  • the pumping is balanced between the cavities, which makes it possible to standardize the stripping in these.
  • the installation also includes a tank of neutralizing product 62, located near the tank 59 and means for transferring the piece 19 (in this case, here, the whole of the piece and the portico 25) from the tank 59 to the tank 62.
  • These means are here constituted by the lifting means 61 previously mentioned.
  • the Stripper product is a mixture of nitric acid and hydrofluoric acid.
  • the neutralizing product is water.
  • the product flow rates taken from the cavities are adjusted to each other substantially proportionally to the respective volumes of these cavities.
  • This flow adjustment is achieved through flow restrictions 65, differently calibrated.
  • we extract the piece of bath by raising again the support 13 while continuing the pumping inside the room so that the product level stripper remaining inside the room gradually decreases thanks pumping but remains substantially equal in all cavities.
  • the rotation of the room is advantageously continued throughout the rinsing phase, likewise than recycling.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • ing And Chemical Polishing (AREA)
  • Cleaning In General (AREA)
EP05291048A 2004-05-17 2005-05-16 Verfahren und Vorrichtung zum Beizen eines rotationssymmetrischen Hohlkörpers Active EP1598447B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0405332 2004-05-17
FR0405332A FR2870142B1 (fr) 2004-05-17 2004-05-17 Procede de decapage d'une piece creuse de revolution et dispositif mettant en oeuvre un tel procede

Publications (2)

Publication Number Publication Date
EP1598447A1 true EP1598447A1 (de) 2005-11-23
EP1598447B1 EP1598447B1 (de) 2012-06-20

Family

ID=34942294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05291048A Active EP1598447B1 (de) 2004-05-17 2005-05-16 Verfahren und Vorrichtung zum Beizen eines rotationssymmetrischen Hohlkörpers

Country Status (8)

Country Link
US (1) US7703463B2 (de)
EP (1) EP1598447B1 (de)
JP (1) JP4619194B2 (de)
CN (1) CN1699626B (de)
CA (1) CA2507164C (de)
ES (1) ES2387986T3 (de)
FR (1) FR2870142B1 (de)
RU (1) RU2367527C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3056605A1 (fr) * 2016-09-29 2018-03-30 Safran Aircraft Engines Dispositif de traitement chimique d'une piece de turbomachine munie d'un element de surface metallique
FR3084673A1 (fr) * 2018-08-02 2020-02-07 Safran Aircraft Engines Dispositif d'immersion d'au moins une piece de turbomachine dans un bain de decapage chimique

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2961598B1 (fr) * 2010-06-21 2012-07-27 Snecma Procede de controle d'une piece en titane ou en alliage de titane en vue de la detection de defauts d'usinage
CN102311231A (zh) * 2011-08-06 2012-01-11 海宁伊满阁太阳能科技有限公司 真空集热管罩玻璃管酸洗蒙砂设备
CN110129809B (zh) * 2019-04-09 2021-04-23 上海老凤祥首饰研究所有限公司 一种千足金双套项链表面无损处理工艺
CN112030174A (zh) * 2020-09-04 2020-12-04 海盐金鼎钢管股份有限公司 一种酸洗效率高的钢管酸洗装置
CN114000158B (zh) * 2021-10-28 2023-11-28 泰安航天特种车有限公司 一种适用于钢管内壁的自动酸洗设备
CN114011790A (zh) * 2021-11-25 2022-02-08 桂林电子科技大学 一种用于机械零件的自动化酸洗加工设备

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598201A (en) * 1944-01-06 1952-05-27 Williams Gethin Apparatus for treating vehicle bodies
GB731569A (en) * 1953-04-24 1955-06-08 Alfred George Honey Improvements relating to apparatus for cleaning ball or roller bearings
US3335916A (en) * 1964-02-29 1967-08-15 A T Juniper Ltd Apparatus for use in the washing of compressor blades of gas turbine engines
US3420712A (en) 1964-07-10 1969-01-07 Parsons Corp Method for treating elongated metal workpieces with a succession of treating liquids
US4046155A (en) * 1974-12-30 1977-09-06 Stal-Laval Turbin Ab Washing apparatus for a compound compressor
JPH04362185A (ja) * 1991-06-07 1992-12-15 Honda Motor Co Ltd 表面処理方法
US5318683A (en) * 1993-02-01 1994-06-07 Quad/Tech, Inc. Electrodeposition system
WO1995021952A1 (de) * 1994-02-15 1995-08-17 Ecograph Ag Verfahren und vorrichtung zur elektrolytischen oberflächenbeschichtung von werkstücken
DE19839479A1 (de) 1998-08-29 2000-03-02 Schaeffler Waelzlager Ohg Verfahren zur chemischen oder elektrochemischen Behandlung eines rotationssymmetrischen Hohlkörpers und zugehörige Halte- und Drehvorrichtung
US20020129837A1 (en) * 2001-03-14 2002-09-19 Ruiz R. Dwane Forced mist cleaning of combustion turbines
DE10308731A1 (de) * 2003-02-28 2004-09-16 Contitech Luftfedersysteme Gmbh Galvanische Beschichtung von Hohlkörpern

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849097A (en) * 1954-08-05 1958-08-26 Udylite Corp Automatic apparatus for chemical treatment of metal articles in bulk
JPS52130155A (en) * 1976-04-26 1977-11-01 Hitachi Ltd Method of and apparatus for pickling elongated small-diametered metal tube
CN2139128Y (zh) * 1992-06-01 1993-07-28 天津市自行车钢材改制厂 单轴带钢酸洗机
JPH08101206A (ja) * 1994-09-29 1996-04-16 Horiba Ltd 洗浄ノズルおよびそれを用いる容器の洗浄方法
DE69504367T2 (de) * 1994-11-22 1999-05-06 United Technologies Corp Ultraschallreinigungsverfahren für turbinenschaufeln

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598201A (en) * 1944-01-06 1952-05-27 Williams Gethin Apparatus for treating vehicle bodies
GB731569A (en) * 1953-04-24 1955-06-08 Alfred George Honey Improvements relating to apparatus for cleaning ball or roller bearings
US3335916A (en) * 1964-02-29 1967-08-15 A T Juniper Ltd Apparatus for use in the washing of compressor blades of gas turbine engines
US3420712A (en) 1964-07-10 1969-01-07 Parsons Corp Method for treating elongated metal workpieces with a succession of treating liquids
US4046155A (en) * 1974-12-30 1977-09-06 Stal-Laval Turbin Ab Washing apparatus for a compound compressor
JPH04362185A (ja) * 1991-06-07 1992-12-15 Honda Motor Co Ltd 表面処理方法
US5318683A (en) * 1993-02-01 1994-06-07 Quad/Tech, Inc. Electrodeposition system
WO1995021952A1 (de) * 1994-02-15 1995-08-17 Ecograph Ag Verfahren und vorrichtung zur elektrolytischen oberflächenbeschichtung von werkstücken
DE19839479A1 (de) 1998-08-29 2000-03-02 Schaeffler Waelzlager Ohg Verfahren zur chemischen oder elektrochemischen Behandlung eines rotationssymmetrischen Hohlkörpers und zugehörige Halte- und Drehvorrichtung
US20020129837A1 (en) * 2001-03-14 2002-09-19 Ruiz R. Dwane Forced mist cleaning of combustion turbines
DE10308731A1 (de) * 2003-02-28 2004-09-16 Contitech Luftfedersysteme Gmbh Galvanische Beschichtung von Hohlkörpern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0172, no. 32 (C - 1056) 12 May 1993 (1993-05-12) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3056605A1 (fr) * 2016-09-29 2018-03-30 Safran Aircraft Engines Dispositif de traitement chimique d'une piece de turbomachine munie d'un element de surface metallique
FR3084673A1 (fr) * 2018-08-02 2020-02-07 Safran Aircraft Engines Dispositif d'immersion d'au moins une piece de turbomachine dans un bain de decapage chimique

Also Published As

Publication number Publication date
RU2367527C2 (ru) 2009-09-20
CN1699626A (zh) 2005-11-23
CN1699626B (zh) 2010-06-09
CA2507164C (fr) 2012-10-16
US20050252530A1 (en) 2005-11-17
RU2005114871A (ru) 2006-11-20
JP2005329402A (ja) 2005-12-02
JP4619194B2 (ja) 2011-01-26
CA2507164A1 (fr) 2005-11-17
FR2870142B1 (fr) 2007-02-09
FR2870142A1 (fr) 2005-11-18
EP1598447B1 (de) 2012-06-20
ES2387986T3 (es) 2012-10-05
US7703463B2 (en) 2010-04-27

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