EP3047939B1 - Werkzeug zum honen einer aussenfläche eines zylindrischen geraden rohrs - Google Patents

Werkzeug zum honen einer aussenfläche eines zylindrischen geraden rohrs Download PDF

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Publication number
EP3047939B1
EP3047939B1 EP16152135.6A EP16152135A EP3047939B1 EP 3047939 B1 EP3047939 B1 EP 3047939B1 EP 16152135 A EP16152135 A EP 16152135A EP 3047939 B1 EP3047939 B1 EP 3047939B1
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EP
European Patent Office
Prior art keywords
honing
sliding
rod
support
passage
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EP16152135.6A
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English (en)
French (fr)
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EP3047939A1 (de
Inventor
Normand Labelle
Alan CACERES
Nhu Nguyen
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Safran Landing Systems SAS
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Safran Landing Systems SAS
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Publication of EP3047939A1 publication Critical patent/EP3047939A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/04—Honing machines or devices; Accessories therefor designed for working external surfaces of revolution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools
    • B24B33/081—Honing tools for external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools
    • B24B33/083—Honing tools with different sets of honing stones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/10—Accessories
    • B24B33/105—Honing spindles; Devices for expanding the honing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally

Definitions

  • the invention relates to the field of lapping a cylindrical outer surface of a rod.
  • a rod such as an aircraft landing gear rod, has cylindrical bearing surfaces such as bearing or bushing bearing surfaces which have tight dimensional tolerances and a carefully treated surface condition to limit the risk of points appearing. oxidation or starting point of fatigue cracks on the span.
  • An object of the invention is to provide a lapping tool alternative to that presented in the document US2474756 or US2162187A and allowing, at least in some cases, to improve the running-in of a cylindrical outer surface of a rod.
  • a lapping tool for honing a cylindrical outer surface of a rod, according to the appended claims.
  • the fact that sliding pads and lapping stones are arranged to simultaneously be in contact against the cylindrical outer annular surface of the rod improves the relative positioning of lapping stones with respect to this cylindrical surface and limits the risk of occurrence vibratory phenomena during the rotation of the base of lapping parts relative to the rod.
  • the deflections between the cylindrical outer surface of the rod and the lapping stones can be limited reducing the deleterious effects related to the vibration phenomena between stones and rod.
  • the sliding pads Including during the rotation of the stone support relative to the rod, the sliding pads and limit the amplitude of movement between the lapping stones and the cylindrical surface. As these pads slide on the outer surface, they do not contribute to the run-in rubbing of the shoe, most of the break-in being carried out by the friction of the lapping stones.
  • the tool according to the invention promotes the homogeneous running-in of the cylindrical outer surface.
  • At least some of the lapping stones and at least some of the sliding pads form pairs, each of these pairs being formed of a lapping stone and a sliding shoe placed opposite each other and on both sides of the passage.
  • the support of lapping stones is in the form of a ring, the stones and pads being in the ring and being oriented towards the passage inside. of the ring.
  • the ring is a form to stiffen the support stones which promotes a smooth running.
  • each lapping stone has a lapping surface and each sliding shoe has a sliding surface, these lapping and sliding surfaces are shaped to come into contact against the cylindrical outer surface of rod when the latter is placed in the passage and these lapping and sliding surfaces being elongate in a direction parallel to an axis of revolution of the cylindrical outer surface of the rod.
  • the running-in and sliding surfaces achieve, throughout the running-in, a long centering of the tool on the rod which limits the geometrical defects generated during break-in.
  • the invention also relates to a method of using a tool according to any one of the embodiments of the invention for lapping a cylindrical outer surface of an aircraft landing gear rod.
  • the invention relates to a lapping tool 1 for honing a cylindrical outer surface 2 of a rod 3 such as a landing gear rod presented to the Figures 1, 2 and 9 .
  • this surface to be honed is metallic and it may be a coating of nickel alloy and / or chromium and / or carbide. This coating can be deposited by electrolytic deposition or by high speed spray deposition (HVOF).
  • HVOF high speed spray deposition
  • the tool 1 comprises a plurality of sliding pads 7, typically made of bronze, carried by the support 5 which is in the form of a ring.
  • These sliding pads 7 and lapping stones 4 are arranged so that when the cylindrical outer surface 2 of the rod 3 is placed inside said passage 6, these stones and pads are simultaneously in contact against the surface 2 to center the this cylindrical external surface 2 inside said passage 6, between the stones 4.
  • the tool also comprises a connection structure 8 between said support 5 lapping stones 4 and a drive motor M rotating the stone support.
  • the drive shaft 10 has a straight cylindrical end with a diameter of less than 20 mm so as to allow the gripping of this straight cylindrical end with the aid of a portable tooling mandrel 12 provided with the drive motor M to rotation of the support 5.
  • this portable tooling 12 may be a nutrunner for example pneumatic.
  • the assembly means 9 detailed to the figure 5 have several peripheral pins 13 parallel to each other and assembled on the same support piece 14 of these peripheral pins which is in the form of a star with three radial branches. As illustrated in Figures 3 and 4 these peripheral pins 13 are arranged to be positioned together in complementary recesses 15 made in the stone support 5.
  • the pins 13 are introduced by their ends 13 'into the corresponding first recess portions 15a and until the portions proximal 13c of these pins 13 abut against an edge of the first portion of the recess 15a and the end portions 13a out of the first portions of the recess 15a. Then rotates the connecting structure 8 by rotation about the Y-axis Y which makes penetrate the intermediate portions 13b of the peripheral pins 13 in the corresponding second recesses 15b. The assembly is thus performed because each of the edges of the recesses 15 is then wedged between the portions 13a and 13c of one of the peripheral pins 13.
  • the disassembly can be done by pivoting in opposite direction the connecting structure 8 with respect to the support 5 then removing the structure 8 along the YY axis.
  • the rod 3 has a cylindrical inner surface 22 coaxial with its cylindrical outer surface 2, then before assembling the connecting structure 8 with the support 5 of lapping stones, it is possible to position a centering piece 16 inside the rod 3 to be centered there by contact against the cylindrical inner surface 22.
  • This centering piece 16 presents an outer surface of revolution 17 extending along a main axis of symmetry of the passage YY.
  • the centering piece 16 also has an annular shoulder 21 adapted to limit the depression of this piece of revolution inside the rod.
  • the centering piece 16 allows a double centering of the rod 3, on the one hand via the lapping stones 4 and sliding pads 7 which bear against the cylindrical outer surface 2 of the rod and secondly via the piece centering 16 which bears against a cylindrical inner surface 22 of the rod 3.
  • the centering piece 16 has a through internal recess 18 which extends along the main axis of symmetry of the passage YY.
  • the tool 1 further comprises a centering pin 19 which extends inside the internal recess 18 to provide a pivot-sliding connection of the centering piece 16 along the centering pin 19, this piece centering member 16 being removable from the centering pin (19).
  • the operator Op can pre-position the centering pin 19 with respect to the recess 18 formed in the centering piece 16 which also pre-positions the connection structure 8 with respect to the rod 3 and with respect to the support 5 .
  • the centering pin 19 has an annular surface 20 in the form of a straight cylindrical piece intended to pass into the internal recess 18 of the centering piece 16 so that this centering piece can pivot with respect to the centering pin 19 and can slide the along this centering pin 19.
  • the centering pin 19 is placed equidistant from the peripheral pins 13 and is parallel to these peripheral pins 13. This centering pin 19 is assembled on the same support piece 14 as the peripheral pins 13 so that the peripheral pins 13 and the centering pin 19 form with the support part 14 a non-deformable mechanical structure.
  • the centering pin 19 has a length such that its end end 19 'extends beyond the respective ends 13' of the peripheral pins 13.
  • the running-in surfaces S1 and slip S2 are shaped to come into contact against the cylindrical outer surface 2 of the rod 3 introduced into the passage 6.
  • Means may also be used to move the guide pads relative to the ring-shaped support 5 to force them against the surface 2 of the rod.
  • the stones 4 are in the form of bars and have a lateral guide plate of the stone relative to the support 5.
  • Each plate is introduced into a corresponding radial slot 25 formed in the support 5 and oriented towards the axis of symmetry YY of the passage 6.
  • each stone is movable radially thanks to the slit / wafer guide.
  • Each pad 7 has a T shape and is placed in a corresponding T-shaped groove 26 formed in the support 5.
  • Flanges 24 are placed on either side of the ring-shaped support to prevent the stones 4 and shoes 7 from sliding out in the slots 25, 26 in a Y-Y direction.
  • Each lapping stone 4 comprises a lapping surface S1 and each sliding shoe 7 has a sliding surface S2, these lapping and sliding surfaces S1, S2 are shaped to come into contact against the cylindrical outer surface 2 of the rod 3 when it is placed in the passage 6.
  • Each of the running-in surfaces S1 has, during sliding friction against a complementary metal surface 2, a first coefficient of friction of sliding.
  • Each of the sliding surfaces S2 has, during sliding friction, against said complementary metal surface, a second coefficient of sliding friction.
  • the first coefficient of friction being at least three times greater than the second coefficient of friction.
  • the base of the lapping stones 5 comprises means 30 for controlling the simultaneous movement of lapping stones with respect to said passage 6. During this simultaneous movement, each lapping stone 5 moves radially with respect to the axis YY and by therefore compared to passage 6.
  • control means 30 comprise a plurality of slides 31 and a control ring 33.
  • Each slide 31 of this plurality of slides is in contact with one of the running-in stones 5 which corresponds to it so that a sliding movement 31 along a main axis ZZ slide causes a radial displacement of the lapping stone 5 which corresponds to it with respect to said passage 6.
  • the radial displacement of a stone is perpendicular to the axis YY.
  • the contact between a slider and the corresponding honing stone is achieved via two uniform cams formed on a rear part of the lapping stone and via two uniform complementary cams formed on a front part of the slider. These four cams act together so that when the slide 31 is moved axially along its axis Z-Z, the stone is then translated along a radial axis vis-à-vis the passage 36 and therefore vis-à-vis the Y-axis.
  • the control ring 33 is threaded around a complementary thread 34 so as to allow this control ring 33 to move along a crown threading axis perpendicular to each of the main axes Z-Z of the slides 31.
  • This ring 33 is mechanically connected to slides 31, via pushers 32, so that the displacement of the control ring 33 along its thread axis causes the displacement of the slides 31 according to their respective Z-Z slide axes.
  • the simultaneous displacement of the slides 31 induces the simultaneous movement of lapping stones 5 with respect to said passage 6, in a concentric movement about the axis Y-Y.
  • platelets 35 On one side of the lapping stones are arranged platelets 35 arranged to form axial abutments for guiding the radial movement movement of each of the lapping stones 5.
  • a disc 36 for guiding the same radial displacement.
  • This embodiment allows by simply screwing the crown 33 to position all lapping stones vis-à-vis sliding pads.
  • the invention also relates to a method for lapping a cylindrical outer surface 2 of an aircraft landing gear rod 3 with the aid of the tool according to the invention.
  • the landing gear rod 3 is immobilized and the lapping stone support 4 is positioned around the cylindrical outer surface 2 of the rod 3 so that the guiding shoes 7 and the lapping stones 4 are in contact with each other. bearing against this cylindrical outer surface 2 of the rod.
  • the pads slide against the cylindrical outer surface of the rod and center the tool 1 and its lapping stones 4 with respect to this cylindrical outer surface 2.
  • the centering piece 16 can be positioned in the bore formed in the rod, against the inner annular cylindrical surface 22 which is coaxial with the the cylindrical outer surface 2.
  • the centering pin 19 of the structure 8 By introducing the centering pin 19 of the structure 8 into the recess 18 of the centering piece 19, the centering pin 19 of the structure 8 is pre-positioned with respect to the rod 3 and the displacement is guided according to FIG. YY axis, peripheral pin 13 relative to the support 5. It thus facilitates the positioning of the ends 13 'of the peripheral pins 13 in the complementary recesses 15 of the support 5.
  • the connecting structure of the tool 1 is rotated.
  • the lapping tool 1 is thus rotated with respect to the rod 3. is guided by the skids sliding on the surface 2 while the stones 4 break the cylindrical outer surface and metal 2 of the landing gear rod.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (13)

  1. Honwerkzeug (1) zum Honen einer zylindrischen Außenfläche (2) einer Stange (3), wobei das Werkzeug umfasst:
    - mehrere Honsteine (4), die dazu geeignet sind, ein Metall zu honen; und
    - einen Träger (5) für diese Honsteine, wobei die Steine (4) von dem Träger (5) derart getragen werden, dass ein Durchgang (6) definiert wird, um den herum sich die Steine (4) befinden und in den man die zylindrische Außenfläche (2) der Stange (3) einführen kann, dadurch gekennzeichnet, dass das Werkzeug (1) mehrere Gleitkufen (7) umfasst, die von dem Träger (5) getragen werden, wobei diese Gleitkufen (7) und die Honsteine (4) so angeordnet sind, dass sie gleichzeitig mit der zylindrischen Außenfläche (2) der Stange (3) in Kontakt sein können, wenn diese im Inneren des Durchgangs (6) angeordnet ist, und dass sie diese zylindrische Außenfläche (2) im Inneren des Durchgangs (6) zentrieren, wobei das Werkzeug ferner eine Verbindungsstruktur (8) zwischen dem Träger (5) für die Honsteine (4) und einem Antriebsmotor (M) zum Drehantrieb des Steinträgers umfasst, wobei diese Verbindungsstruktur (8) umfasst:
    - Verbindungsmittel (9) zum Verbinden der Verbindungsstruktur (8) mit dem Träger (5) für die Honsteine (4), wobei diese Verbindungsmittel (9) die Demontage der Verbindungsstruktur (8) von dem Steinträger (5) gestatten; und
    - eine Antriebswelle (10) zum Drehantrieb der Verbindungsstruktur (8), wobei diese Antriebswelle (10) mit den Verbindungsmitteln (9) über eine verformbare Verbindung (11), wie z. B. eine Gelenkverbindung, verbunden ist.
  2. Honwerkzeug (1) nach Anspruch 1, bei dem zumindest einige der Honsteine (4) und zumindest einige der Gleitkufen (7) Paare bilden, wobei jedes dieser Paare aus einem Honstein (4) und einer Gleitkufe (7) gebildet ist, die einander gegenüberliegend zu beiden Seiten des Durchgangs (6) angeordnet sind.
  3. Honwerkzeug nach Anspruch 2, bei dem diese Paare gleichmäßig um den genannten Durchgang (6) herum verteilt sind.
  4. Honwerkzeug nach einem der vorhergehenden Ansprüche, bei dem der Träger (5) die Form eines Ringes hat.
  5. Honwerkzeug nach einem der vorhergehenden Ansprüche, bei dem jeder Honstein (4) eine Honfläche (S1) umfasst und jede Gleitkufe (7) eine Gleitfläche (S2) aufweist, wobei diese Honflächen (S1) und diese Gleitflächen (S2) so geformt sind, dass sie in Kontakt mit der zylindrischen Außenfläche (2) der Stange (3) kommen, wenn diese in dem Durchgang (6) angeordnet ist, und wobei diese Honflächen (S1) und diese Gleitflächen (S2) in einer Richtung parallel zu einer Rotationsachse (X-X) der zylindrischen Außenfläche der Stange (2) langgezogen sind.
  6. Honwerkzeug nach einem der Ansprüche 1 bis 4, bei dem:
    - jeder Honstein (4) eine Honfläche (S1) umfasst und jede Gleitkufe (7) eine Gleitfläche (S2) aufweist, wobei diese Hon- und Gleitflächen (S1, S2) so geformt sind, dass sie mit der zylindrischen Außenfläche (2) der Stange (3) in Kontakt kommen, wenn diese in dem Durchgang (6) angeordnet ist; und bei dem
    - jede der Honflächen (S1) während einer Gleitreibung an einer komplementären Metallfläche (2) einen ersten Gleitreibungskoeffizienten aufweist;
    - jede der Gleitflächen (S2) während einer Gleitreibung an der genannten komplementären Metallfläche einen zweiten Gleitreibungskoeffizienten aufweist, wobei der erste Gleitreibungskoeffizient mindestens dreimal größer als der zweite Reibungskoeffizient ist.
  7. Honwerkzeug nach einem der Ansprüche 1 bis 6, bei dem die Antriebswelle (10) zum Drehantrieb der Verbindungsstruktur (8) ein gerades zylindrisches Ende mit einem Durchmesser aufweist, der kleiner als 20 mm ist, so dass das Ergreifen dieses geraden zylindrischen Endes mittels eines Futters eines tragbaren Werkzeugs (12) ermöglicht wird, das mit einem Antriebsmotor (M) zum Drehantrieb des Trägers (5) für die Steine (4) ausgestattet ist.
  8. Honwerkzeug nach einem der Ansprüche 1 bis 7, bei dem die Verbindungsmittel (9) mehrere Umfangsstifte (13) umfassen, die parallel zueinander und an einem selben Trägerteil (14) für diese Umfangsstifte montiert sind, wobei diese Umfangsstifte (13) so angeordnet sind, dass sie gemeinsam in komplementären Aussparungen (15) positioniert werden können, die in dem Steinträger (5) ausgebildet sind, und wobei diese Verbindungsmittel (9) derart sind, dass, wenn sie mit dem Steinträger (5) verbunden sind, die Umfangsstifte (13) dann einer Translation in Bezug auf den Steinträger in einer Translationsrichtung parallel zu den Umfangsstiften (13) unterliegen.
  9. Honwerkzeug nach einem der vorhergehenden Ansprüche, ferner umfassend ein Zentrierstück (16), das eine Rotationsaußenfläche (17) aufweist, die sich entlang einer Hauptsymmetrieachse (Y-Y) des Durchgangs erstreckt, wobei sich die Honsteine (4) und die Gleitkufen (7) entlang dieser Hauptsymmetrieachse (Y-Y) des Durchgangs und parallel zu dieser Hauptsymmetrieachse erstrecken, und wobei diese Honsteine (4) und Gleitkufen (7) alle zur Rotationsaußenfläche (17) beabstandet sind und einen gleichen Abstand zu dieser Rotationsaußenfläche (17) haben.
  10. Honwerkzeug nach dem vorhergehenden Anspruch, bei dem das Zentrierstück (16) eine innere durchgehende Aussparung (18) aufweist, die sich entlang der Hauptsymmetrieachse (Y-Y) des Durchgangs erstreckt, wobei das Werkzeug ferner einen Zentrierstift (19) umfasst, der sich im Inneren der inneren durchgehenden Aussparung (18) des Zentrierstückes (16) erstreckt, um eine Gleit-Schwenkverbindung des Zentrierstückes (16) entlang des Zentrierstiftes (19) herzustellen, wobei dieses Zentrierstück (16) von dem Zentrierstift (19) abnehmbar ist.
  11. Honwerkzeug nach einem der vorhergehenden Ansprüche, bei dem der Träger (5) für die Honsteine Steuermittel (30) zum gleichzeitigen Bewegen der Honsteine in Bezug auf den Durchgang (6) umfasst.
  12. Verfahren zur Verwendung eines Werkzeugs nach einem der vorhergehenden Ansprüche zum Honen einer zylindrischen Außenfläche (2) einer Luftfahrzeugfahrwerkstange (3).
  13. Verfahren nach Anspruch 12, bei dem man die Fahrwerkstange (3) blockiert und man dann den Träger (5) für die Honsteine (4) um die zylindrische Außenfläche (2) der Stange (3) herum derart positioniert, dass die Führungskufen (7) und die Honsteine (4) an dieser zylindrischen Außenfläche (2) der Stange anliegen, und man dann mittels der Verbindungsmittel (9) zum Verbinden der Verbindungsstruktur (8) diese Verbindungsstruktur mit dem Honsteinträger verbindet, und man mittels eines Antriebsmotors (M), der an die Antriebswelle zum Drehantrieb der Verbindungsstruktur gekoppelt ist, das Honwerkzeug in Drehung in Bezug auf die Stange antreibt, um so die zylindrische Außenfläche der blockierten Fahrwerkstange zu honen.
EP16152135.6A 2015-01-23 2016-01-20 Werkzeug zum honen einer aussenfläche eines zylindrischen geraden rohrs Active EP3047939B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1550558A FR3031925B1 (fr) 2015-01-23 2015-01-23 Outil de rodage d'une surface externe d'un tube cylindrique droit

Publications (2)

Publication Number Publication Date
EP3047939A1 EP3047939A1 (de) 2016-07-27
EP3047939B1 true EP3047939B1 (de) 2017-09-13

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US (1) US10183373B2 (de)
EP (1) EP3047939B1 (de)
CA (1) CA2918614C (de)
FR (1) FR3031925B1 (de)

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CN112959208B (zh) * 2021-02-18 2022-03-01 赣州逸豪新材料股份有限公司 一种通电辊表面处理装置及其加工工艺
CN113212742A (zh) * 2021-06-11 2021-08-06 丰县盛禾智能设备有限公司 可水面悬浮无人机脚架及其脚架加工装置
CN113894694A (zh) * 2021-10-22 2022-01-07 江西洪都航空工业集团有限责任公司 一种外圆珩磨工具
CN114918777B (zh) * 2022-05-17 2024-05-07 吕晨 一种ppc管环绕式加工打磨设备

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FR3031925A1 (fr) 2016-07-29
CA2918614A1 (fr) 2016-07-23
CA2918614C (fr) 2018-06-12
FR3031925B1 (fr) 2017-08-25
EP3047939A1 (de) 2016-07-27
US20160214229A1 (en) 2016-07-28
US10183373B2 (en) 2019-01-22

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