• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:FR3017556A1
    申请号:FR1451204
    申请日:2014-02-14
    公开日:2015-08-21
    发明作者:Romain Rene Marcel Chardonnet；Jean-Yves Francois Henri Maillet；Erwan Soubigou
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD OF THE INVENTION AND PRIOR ART The present invention generally relates to the clamping of workpieces. BACKGROUND OF THE INVENTION It advantageously finds application in the field of aeronautics for the implementation of etching operations and / or abradable injection on inner rings of low pressure turbomachine rectifiers. STATE OF THE ART It is conventional to maintain parts in precise positions on work benches by means of reference flanges. We know including manually adjustable clamping systems. Such a system comprises, for example, a holding pad which forms a first jaw and which is coupled to a clamping screw. Said clamping screw passes through said pad and is engaged in a reference support with respect to which it is desired to position the part during the intervention. Such a manual system has the disadvantage of not allowing uniform clamping from one flange to another and requiring long installation times. Moreover, the force exerted on the part is not repetitive and can be highly variable from one operator to another. Furthermore, hydraulic or pneumatic clamping systems are known. Clamping is done by hydraulic or pneumatic compression. However, this assumes having a large hydraulic or pneumatic energy storage and in particular having safety reserves to compensate for any possible failure in the production of hydraulic or pneumatic pressure. Energy management and maintenance of these systems is expensive. Control and monitoring of the clamping pressure is also complex. Moreover, these techniques are poorly adapted to sealing and / or abradable injection operations on inner shrouds of low-pressure turbomachine rectifiers. During these operations indeed, the rectifier must be rotated. A clamping by pneumatic or hydraulic energy would require to be able to accompany this rotation by winding the pipes of the hydraulic or pneumatic supply, which is particularly complex to organize. In particular, the center of the rectifier can not be used to pass such pipes since it is used for other functions in these operations. GENERAL PRESENTATION OF THE INVENTION An object of the invention is to solve the problems of the state of the art and to propose a system that does not have the aforementioned drawbacks. More particularly, the invention proposes a clamping system comprising a clamping jaw mounted on the axis of a pneumatic or hydraulic jack, characterized in that said jack is of a structure which, when the supply of said jack in energy pneumatic or hydraulic is cut, causes the clamping jaw to its clamping position, the supply of said cylinder in pneumatic or hydraulic energy opposing said clamping. The proposed clamping system makes it possible to clamp the workpiece when the pneumatic supply is cut off. This eliminates various needs for power, energy storage, etc.
    [0002] Clamping is made very reliable and safe for the operator. In particular, the clamping is made repetitive, regardless of the flange. Because it is made permanent, the system also requires no or few maintenance operations. The invention also proposes a method for sealing and / or injecting abradable material onto the inner shell of a low-pressure turbomachine rectifier, characterized in that it comprises the following steps: flange intervention comprising a clamping system of the aforementioned type, positioning of the rectifier on said bench, clamping of at least one flange by cutting off its pneumatic or hydraulic supply. It further proposes a tool for sealing and / or injecting abradable onto the inner ferrule of a low-pressure turbomachine rectifier, characterized in that it comprises an intervention bank and at least one flange comprising such a system. clamping. PRESENTATION OF THE FIGURES Other characteristics and advantages of the invention will become apparent from the description which follows, which is purely illustrative and nonlimiting, and should be read with reference to the appended figures in which: FIG. 1 is a diagrammatic perspective view a turbomachine low pressure rectifier; FIG. 2 schematically illustrates the principle of a positive clamping energized system according to a possible embodiment of the invention; FIG. 3 illustrates in perspective an exemplary embodiment for the clamping system of FIG. 2; FIG. 4 illustrates an example of use for clamping the inner ferrule or the outer shroud of a turbomachine low-pressure rectifier.
    [0003] DESCRIPTION OF ONE OR MORE MODES OF REALIZATION OR IMPLEMENTATION The rectifier R illustrated in FIG. 1 comprises an inner ferrule VI, an outer ferrule VE and blades A assembled by welding to the outer ferrule VE. These blades A are integral with the inner ring VI through an abradable surface AB. The deposition of this abradable surface is performed during sealing and injection operations requiring clamping of the outer shell VE and the inner ring VI on a support structure of an intervention bank. For this purpose, the inner ferrule VI and outer ferrule VE are held at several points by means of reference flanges. To do this, it is proposed to use permanent clamping systems of the type of the system 1 illustrated in FIG. 2. Such a clamping system is a system comprising one or more springs 2 exerting on the piston 3 of a jack 4 a force which is used to perform said clamping. A hydraulic / pneumatic circuit 10 is provided, but only for loosening of the clamping system 1, no power being needed for clamping. In the schematic example illustrated in Figure 2, one or more spring (s) 2 is (are) compressed (s) between the piston 3 and the bottom 5a of the body 5 of the cylinder 4. The piston 3 is integral with the axis 6 of the cylinder, which opens out of the body 5. At its end opposite the piston 3, said axis 6 is itself integral with a clamping jaw 7. A cam 8 is provided to lock the clamping jaw 7 and the 6 axis in a raised high position (release position). For this purpose, said cam 8 cooperates with a groove 9 that has the axis 6 and 30 in which it is possible to engage said cam 8 when the jaw 7 is in the up position. The positioning of the cam on the cylinder 4 or disengagement is for example made manually.
    [0004] When the cam 8 and the groove 9 are disengaged, the springs 2 push back the piston 3 of the jack 4. Said piston 3 moves inside the body 5 of the jack 4. The jaw 7, which moves with the piston 3, is movable in the direction of the descent along the arrow D to clamp the workpiece to be clamped. The loosening is obtained by supplying pneumatic energy to the circuit 10 along the arrow E. A force is exerted against the piston 3, which is movable in the direction of the rise along the arrow M inside said body 5 and compresses the springs 2.
    [0005] When the hydraulic / pneumatic power is cut off, the springs 2 exert their compression force, but the jaw 7 remains in its upper loosening position if the cam 8 has been engaged in the groove 9. It can also be provided that the displacement of the piston 3 and the axis 6 inside the body 5 of the cylinder 4 is in a helical movement to rotate the jaw 7 90 degrees on itself when moving to the position loosening. Such a helical movement facilitates the disengagement of the workpiece to be clamped. Furthermore, as shown in Figure 3, the body 5 of the cylinder 20 4 may be associated with different means 11 (clamping jaws for example) which allow to fix the system 1 on a given support accurately. FIG. 4 illustrates the use of clamping systems of the type of the system 1 which has just been described for positioning the ferrules VI and VE of a rectifier R on an intervention bank B. The various reference flanges 1 are first fixed accurately on the B bench with the fastening means 11 (Figure 3) they comprise, the flanges 1 and B bench constituting part of the intervention tooling. Then the rectifier R is placed on said bench B. The locking cams of the reference flanges 1 located at the outer ring VE are then removed. These reference flanges 1 are then tightened on the outer shell VE by cutting off the pneumatic pressure in the circuit.
    [0006] VE ferrule being thus clamped, it then proceeds to clamp the inner ferrule VI. The rectifier R is thus maintained in position on the intervention bench B, the sealing operations are performed on the inner surfaces of the inner shell and in the openings thereof. The sealing is done for example by depositing an RTV silicone. It allows to create a sealing of the track before injection of the abradable material itself. The polymerization of the abradable material is then carried out on openings of the inner ferrule. The unclamping / unlocking of the different flanges 1 is then ensured by putting the different flanges under hydraulic / pneumatic pressure.
    [0007] When the different cams 8 are repositioned, the hydraulic / pneumatic pressure can be cut again. The reference flanges 1 can then be removed. When the flanges 1 are not used, the cams 8 can be disengaged in order to limit the biasing of the springs 2.
    [0008] It will be understood that the energy thus required for carrying out clamping is low. Furthermore, the clamping performed is particularly reliable and is not dependent on the level of hydraulic / pneumatic pressure provided by the circuits.
    [0009] It is repetitive, the clamping being the same regardless of the flange. It is realized quickly and is effortless for the user who carries out the clamping. It does not require significant hydraulic / pneumatic energy storage.
    [0010] It requires very little maintenance.
    权利要求:
    Claims (2)
    [0001]
    REVENDICATIONS1. Clamping system comprising a clamping jaw mounted on the axis of a pneumatic or hydraulic cylinder, characterized in that said jack is of a structure which, when the supply of said jack in pneumatic or hydraulic energy is cut, causes the clamping jaw to its clamping position, the supply of said cylinder in pneumatic or hydraulic energy opposing said clamping.
    [0002]
    2. clamping system according to claim 1, characterized in that said jack comprises a piston and at least one compression spring which acts against the piston, the clamping jaw being connected to said piston and being moved, to realize its tightening, under the compressive force of the spring or springs. Clamping system according to one of the preceding claims, characterized in that it comprises locking means of the jack when the clamping jaw is in the loose position. Clamping system according to one of claims 1 to 3, characterized in that the cylinder structure is adapted so that the displacement of the clamping jaw between its clamping and loosening positions is done in a helical movement. Clamping system according to claim 4, characterized in that the rotation of the clamping jaw between the clamping and unclamping positions is 90 °. A process for sealing and / or injecting abradable material on the inner ring of a low-pressure turbomachine rectifier, characterized in that it comprises the following steps consisting of: 4. 5. 6. to: - position on a flange intervention bench comprising a clamping system according to one of the preceding claims, - position the rectifier on said bench, - clamp at least one flange by cutting off its supply pneumatic or hydraulic. 7. Method according to claim 6, characterized in that one carries out the clamping of the outer shell, and then the clamping of the inner shell. 8. Method according to one of claims 6 or 7, characterized in that, after the sealing operations and / or polymerization, the flanges are unlocked by pneumatic or hydraulic supply. 9. Tooling for sealing and / or injection of abradable on the inner ring of a low-pressure turbomachine rectifier, characterized in that it comprises an intervention bench and at least one flange comprising a clamping system according to the invention. one of claims 1 to 5.20
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    引用文献:
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    EP1310331A2|2001-11-13|2003-05-14|Kabushiki Kaisha Kosmek|Rotary clamp|
    FR2989414A1|2012-04-16|2013-10-18|Snecma|METHOD AND TOOLING FOR MOUNTING A RECTIFIER STAGE|BE1027875A1|2019-12-17|2021-07-09|Safran Aero Boosters Sa|PART CLAMPING SYSTEM|SU416494A1|1970-10-19|1974-02-25|
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    AU2014248932B2|2013-03-11|2017-04-27|Herzog Contracting Corp.|Clamp assembly|CN110382166B|2017-03-17|2021-11-09|西门子歌美飒可再生能源公司|Alignment tool, cutting device and method for processing a workpiece|
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    CN111376128B|2020-04-30|2021-10-22|安徽中材新材料科技有限公司|Cylindrical grinding machine|
    法律状态:
    2016-02-12| PLFP| Fee payment|Year of fee payment: 3 |
    2017-02-13| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 5 |
    2018-02-09| CD| Change of name or company name|Owner name: SAFRAN AIRCRAFT ENGINES, FR Effective date: 20170717 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 7 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 8 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 9 |
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