US20060228219A1 - Repaired spline and seal teeth on mated components - Google Patents

Repaired spline and seal teeth on mated components Download PDF

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Publication number
US20060228219A1
US20060228219A1 US11/104,171 US10417105A US2006228219A1 US 20060228219 A1 US20060228219 A1 US 20060228219A1 US 10417105 A US10417105 A US 10417105A US 2006228219 A1 US2006228219 A1 US 2006228219A1
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US
United States
Prior art keywords
spline
pressure face
gas turbine
turbine engine
weight percent
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.)
Abandoned
Application number
US11/104,171
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English (en)
Inventor
Troy Finton
Thomas Kelly
Kenneth Lutz
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General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US11/104,171 priority Critical patent/US20060228219A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FINTON, TROY LANCE, LUTZ, KENNETH ERIC, KELLY, THOMAS JOSEPH
Priority to EP06251916.0A priority patent/EP1712736A3/en
Priority to JP2006107041A priority patent/JP2006291358A/ja
Priority to CA002542677A priority patent/CA2542677A1/en
Priority to BRPI0601539-5A priority patent/BRPI0601539A/pt
Priority to SG200807378-5A priority patent/SG147412A1/en
Priority to SG200602434A priority patent/SG126875A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FINTON, TROY LANCE, LUTZ, KENNETH ERIC, KELLY, THOMAS JOSEPH
Publication of US20060228219A1 publication Critical patent/US20060228219A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/026—Shaft to shaft connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/005—Repairing methods or devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/60—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/40—Transmission of power
    • F05D2260/403—Transmission of power through the shape of the drive components
    • F05D2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections

Definitions

  • the present invention relates generally to repair of mated components. More particularly, this invention is directed to the repair of spline and seal teeth for an aircraft engine shaft.
  • a gas turbine engine includes a compressor that provides pressurized air to a combustor wherein the air is mixed with fuel and burned for generating hot combustion gasses. These gasses flow downstream to one or more turbines that extract energy therefrom to power the compressor and provide thrust for powering an aircraft in flight.
  • a hollow shaft is axially located within the gas turbine to connect the compressor and turbine for rotation therewith.
  • the shaft may be interconnected to rotary components of the engine by a series of radially spaced spline teeth or “splines.”
  • the shaft is typically manufactured with a forging, machining and hardening process.
  • a gas turbine engine rotates in a single direction during operation and is a delicately balanced machine.
  • the splines on the shaft transmit loads and experience wear, generally on a single face.
  • a spline is a thin member that interfaces with a mating spline on an adjacent part.
  • the face of each spline that transmits the torque from the turbine to the compressor typically wears in a predictable pattern. This wear on the load transmitting, or pressure, face of the splines can cause loss of material stock, the creation of a stress riser on the pressure face and reduction of service life of the part, eventually necessitating an engine rebuild. Excessive spline wear could result in failure of both the splines and the engine.
  • the shaft is inspected to determine the amount of wear on various contacting surfaces, including the spline and seal teeth.
  • the shaft dimensions are compared to a predetermined set of dimensions and tolerances.
  • a shaft that is not within acceptable tolerances of the predetermined dimensions is typically scrapped and a new shaft is inserted into the rebuilt engine.
  • One reason for scrapping the shaft is the lack of adequate repair methods for the worn spline teeth.
  • the wear experienced by the splines is only a few thousandths of an inch on the pressure face of the splines, with negligible wear on the opposite faces and tops of the splines.
  • HAZ heat affected zone
  • the HAZ is the region(s) surrounding a weld that are measurably affected by the welding process. If sufficient heat is transferred into a welded substrate, microstructure grain size can increase. A larger grain size is associated with lower fatigue life and results in a material microstructure that is more susceptible to cracking and will withstand less cyclic stress. Fatigue cracking on the pressure face of splines are a known cause of premature failure.
  • the present invention is directed to repaired spline teeth of a mated component.
  • the present invention provides a method of minimizing the alteration of physical properties adjacent a weld repair area, by creating a low heat input through welding a minimal amount of repair material to a surface that opposes the worn area, while providing a full metallurgical bond between the repair material and the substrate.
  • a repaired component of a gas turbine engine configured to matingly engage a complementary component of the gas turbine engine.
  • the repaired component comprises a plurality of splines radially spaced about the component, wherein each spline has a pressure face and a non-pressure face opposite the pressure face, wherein the pressure face of at least one repaired spline has a surface remachined from original spline material, and wherein the non-pressure face of the at least one repaired spline has a surface comprised of a layer of repair material metallurgically bonded to the original spline material.
  • a repaired gas turbine engine shaft configured to connect a compressor and a turbine of a gas turbine engine to provide a common axis of rotation for the compressor and turbine.
  • the repaired shaft comprises a plurality of splines radially spaced about the shaft, wherein each spline has a pressure face and a non-pressure face opposite the pressure face, wherein the pressure face of at least one spline comprises original spline material, and wherein the non-pressure face of the at least one spline has a surface comprised of a layer of repair material metallurgically bonded to the original spline material, wherein the pressure face and non-pressure face are remachined to provide a repaired spline and wherein the repaired spline has a heat affected zone with a grain size of less than ASTM number 10.
  • FIG. 1 is a perspective view of a power turbine shaft of an aircraft engine.
  • FIG. 2 is an enlarged partial sectional view, taken along the line 2 - 2 of FIG. 1 , with spline wear exaggerated for clarity.
  • FIG. 3 is a sectional view of a power turbine shaft illustrating a series of the splines of FIG. 2 in which the thickness of welded repair material is exaggerated for clarity.
  • FIG. 4 is an enlarged partial sectional view similar to FIG. 2 , illustrating an exemplary contour of a spline to which repair material has been attached in accordance with the present invention.
  • FIG. 5 is an enlarged partial sectional view similar to FIG. 2 , illustrating an exemplary contour after remachining of a spline in accordance with an embodiment of the present invention.
  • FIG. 6 is a perspective view of the spline portion of the shaft of FIG. 1 having an overlay applied over the splines according to an embodiment of the invention.
  • FIG. 7 is a perspective view of the spline portion of the shaft of FIG. 1 having an overlay applied over the splines according to another embodiment of the invention.
  • FIG. 1 illustrates a power turbine shaft 10 of an aircraft engine (not shown) to include a splined portion 12 and a seal portion 14 .
  • Splined portion 12 includes a plurality of splines 20 aligned substantially parallel to the axis of shaft 10 and radially spaced about shaft 10 .
  • Spline 20 has an exterior surface 30 that defines a typical repair area, or worn portion, 32 and a non-worn portion 34 .
  • Worn portion 32 is defined by a phantom line 38 and a worn surface 36 .
  • spline 20 was manufactured to dimensions defined by phantom line 38 and exterior surface 30 .
  • worn portion 32 has been lost by spline 20 , so that exterior surface 30 includes worn surface 36 .
  • torque was transferred between the shaft 10 and the complementary device, resulting in wear and the loss of worn portion 32 .
  • worn portion 32 is located on the pressure, or contact, face 40 of spline 20 .
  • the opposite face of spline 20 is referred to as non-pressure, or non-contact, face 42 .
  • FIG. 3 is a portion of the shaft 10 which illustrates a series of splines 20 with repair material 50 attached thereto.
  • repair material 50 is welded to the spline 20 using a focused energy, or low heat, input welding process. Even more preferably, the weld puddle created is approximately 39.4 mils ( ⁇ 1 mm) in diameter.
  • Exemplary welding processes are pulsed plasma arc, micro plasma arc, pulsed laser, and pulsed electron beam.
  • the micro plasma arc is preferably applied at welding currents between about 0.1 and 15 amps. In this manner, repair material 50 can be welded to the spline 20 with a minimum of heat input into spline 20 to reduce the HAZ.
  • the wire is preferably less than about 39.4 mils ( ⁇ 1 mm) in diameter.
  • welding repair material 50 onto spline 20 could be accomplished with a manual or automated process, or a combination of the two.
  • the welding process is typically accomplished with a voltage of about 100-140 kV and an amperage of about 5 to 10 mA.
  • the pass rate is typically about 10-20 inches per minute. It will be appreciated that any technique or combination of techniques can be used, so long as the heat input is controlled to prevent excessive grain growth in the HAZ. Excessive grain growth as used herein is an increase in grain size that adversely affects the material properties of the spline, preventing re-use of the spline.
  • repair material 50 is bonded to spline 20 while reducing the HAZ adjacent the weld.
  • the HAZ grain size can be within a desired range of less than ASTM Number 10, as determined by ASTM E112-96e2, Standard Test Methods for Determining Average Grain Size. Grain sizes larger than a desired value are generally associated with promoting the propagation of fatigue cracks, which can lead to component failure.
  • Splines 20 are thin, narrow projections on shaft 10 , and as such, it is desirable to maintain the heat input as low as reasonably possible to reduce the effect of the HAZ on the pressure face 40 of each spline 20 . If the heat input were not controlled, HAZ and grain growth may extend from the non-pressure face 42 through the spline 20 to the pressure face 40 , thereby negating the effectiveness of a repair. Thus, even though some grain growth may occur, the low heat input limits the effects of the repair to the non-pressure face 42 , which typically is not in contact with any other component during normal operation and thus the HAZ and grain growth if properly controlled and limited to the non-pressure face 42 will not be a significant factor in fatigue.
  • repair material 50 is attached to the spline in a manner that results in a build-up of repair material 50 on the non-pressure face 42 .
  • FIG. 4 further illustrates in phantom the contour of a repaired spline 20 ′ which includes a repaired pressure face 40 ′ and a repaired non-pressure face 42 ′.
  • shaft 10 is remachined, or cut, creating a repaired spline 20 ′.
  • the method of the present invention includes identifying a repair area 45 on pressure face 40 of spline 20 , welding repair material 50 to non-pressure faces 42 , and machining shaft 10 to produce repaired spline 20 ′.
  • the repair area 45 is defined by the area of spline 20 to be machined to provide a repaired pressure face 40 ′.
  • all splines 20 of shaft 10 will typically require a build up of repair material 50 onto the non-pressure faces 42 to provide repaired splines 20 ′.
  • the pressure face 40 of each spline 20 is machined to the contour of repaired pressure face 40 ′.
  • the non-pressure face 42 is preferably also machined to remove excess repair material 50 to produce repaired non-pressure face 42 ′.
  • repaired splines 20 ′ are slightly reclocked on shaft 10 when compared to the original radial locations of splines 20 , but otherwise the repaired splines 20 ′ have dimensions that are the same or nearly the same as the original splines 20 and within fit-up tolerances.
  • FIG. 5 illustrates a repaired spline 20 ′ after completion of machining operations.
  • remachined pressure face 40 ′ of spline 20 ′ is comprised of original forged shaft material and not of repair material 50 .
  • shaft 10 is provided with a wear surface that comprises the original shaft materials.
  • This original material retains the desired physical properties for splines 20 and, in using the method described herein, has not been significantly altered by the welding process.
  • a repair consisting of applying a repair material to worn portion and remachining a shaft to original dimensions would provide a shaft with contacting surfaces that may have undesirable properties.
  • the process described herein while preferably directed to repairing splines 20 that have been worn due to normal use, could also be used, for example, to repair splines 20 that do not conform to required tolerances for whatever reason.
  • Repair material 50 is typically built up on non-pressure face 42 to a thickness of less than about 40 mils, preferably less than about 15 mils.
  • the repair material may be applied in a plurality of passes, in order to minimize heat input on any one pass.
  • the build-up of repair material 50 is at least as thick as the worn portion 32 in order to restore the repaired spline 20 ′ to the same dimensions as the spline 20 prior to use and its subsequent wear.
  • repair material 50 is of identical material as shaft 10 , which materials are typically superalloys selected from the group consisting of nickel-based, iron-based, cobalt-based, and combinations thereof. Even more preferably, shaft 10 and repair material 50 are INCONEL® 718, although other suitable materials could be repaired using the method described herein. INCONEL® is a federally registered trademark owned by Huntington Alloys Corporation of Huntington, W. Va.
  • INCONEL® 718 is well known in the art and is a designation for a nickel-based superalloy comprising about 18 weight percent chromium, about 19 weight percent iron, about 5 weight percent niobium+tantalum, about 3 weight percent molybdenum, about 0.9 weight percent titanium, about 0.5 weight percent aluminum, about 0.05 weight percent carbon, about 0.009 weight percent boron, a maximum of about 1 weight percent cobalt, a maximum of about 0.35 weight percent manganese, a maximum of about 0.35 weight percent silicon, a maximum of about 0.1 weight percent copper, and the balance nickel.
  • the HAZ of the repaired spline will be adjacent the repaired non-pressure face 42 ′ of repaired spline 20 ′.
  • the grain size within this HAZ may be larger than the grain size of original shaft 10 material adjacent pressure face 40 ′.
  • Heat treatment is typically carried out at a temperature between about 1150° F. to about 1400° F. for up to about 16 hours using standard ramp rates for the material selected to reach the treatment temperature.
  • wire feed welding methods may be used to repair splines in accordance with exemplary embodiments of the invention. While satisfactory results are achieved with wire feed welding, to achieve a level of consistency and repeatability in a production environment, yet another exemplary embodiment of the invention is provided.
  • a method for repairing the splines involves the use of a sheath or overlay that fits over the splines of the gas turbine shaft.
  • the overlay covers and contacts the splines and acts as a sacrificial source of repair material for welding.
  • the use of an overlay provides better control over the amount of repair material applied to the splines and thus provides better heat control during welding.
  • an overlay 600 is a tubular device comprised of any weld repair material, and preferably is INCONEL® 718.
  • the overlay 600 has an outer surface 620 and an inner surface 625 that defines an aperture 630 through which the splines 20 fit.
  • the inner surface 625 is dimensioned to substantially match the geometry and dimensions of the splines 20 so that when the overlay 600 is placed over the splines 20 of the shaft 10 , the overlay 600 is substantially immobilized by a slip fit with the splines 20 which are received by matching recesses formed along the inner surface 625 of the overlay 600 .
  • the outer surface 620 of the overlay 600 may be defined by any cross-sectional area.
  • the outer surface 620 may be defined by a circular cross sectional area as shown in FIG. 6
  • a cookie-cutter style overlay 700 as shown in FIG. 7 is used.
  • the overlay 700 has a substantially uniform thickness, decreasing the amount of material needed to construct the overlay 700 , in which both an outer surface 720 and an inner surface 725 of the overlay 700 substantially match the contour of the splines 20 .
  • the overlay 600 may have a series of parallel scribes lines 640 running along the length of the overlay 600 .
  • the scribe lines 640 can be made using any method known in the art and are spaced on the outer surface 620 of the overlay 600 such that the scribe lines 640 define alternating areas over the pressure face 40 and non-pressure face 42 of the splines 20 .
  • a series of weld passes are made in the area between two scribe lines 640 , which area is over a non-pressure face of a spline 20 .
  • the welds are made in a direction parallel to the scribe lines.
  • the weld causes a portion of the overlay 600 to be metallurgically bonded as repair material to the non-pressure face 42 of the splines 20 .
  • the process is repeated with respect to the next set of scribe lines 640 that define an area over a non-pressure face 42 of a spline 20 , skipping every other area defined by the scribe lines 640 , which define an area over a pressure face 40 of a spline 20 for which it is not desired to attach any repair material.
  • the overlay 600 has an outer surface defined by a circular cross-sectional area as shown in FIG. 6 , the distance from the outer surface 620 to the non-pressure face 42 of the spline 20 , and the depth of the weld, changes with each pass.
  • the overlay 600 is of a sufficient thickness to allow heat from the weld to heat the inner surface 625 of the overlay 600 and thus result in the deposition of repair material on the non-pressure face 42 of the splines.
  • the overlay 600 can be of any length, but is preferably at least as long as the splines 20 of the shaft 10 to avoid the need to use more than one overlay 600 , and to permit a single, uninterrupted path along the length of each spline 20 .
  • the overlay 700 is longer than the splines 20 . It will be appreciated that the lengths of the overlay shown in FIGS. 6 and 7 are for purposes of illustration and are not dependent on the shape of the overlay.
  • heat surge and the like are known to sometimes occur at points of weld initiation or termination.
  • variations of quality may occur in the weld resulting in localized areas having undesirable properties.
  • the weld is initiated or stopped beyond the splines 20 , a consistent weld can be achieved over the entire length of the splines 20 and any heat surge occurs at an area of the overlay 700 not in contact with the splines 20 .
  • start and stop tabs 760 , 770 may be provided that serve as markers on the outer surface 720 of points before and after the splines 20 .
  • the tabs 760 , 770 indicate that welding can be initiated or stopped with little risk of heat surge or other damage to the splines 20 .
  • the start and stop tabs 760 , 770 may be used in combination with scribe lines to define an area for welding, although scribe lines may be unnecessary when using an overlay 700 having a substantially constant thickness as illustrated in FIG. 7 , in which the peaks and valleys of the contoured outer surface 720 perform the same function as scribe lines.
  • Precision welding tools as are known in the art may be used to accomplish the various welding processes of the invention using an overlay.
  • the width and depth of a weld run can be controlled so that the weld does not result in repair material from the overlay being applied to the pressure face of any spline.
  • a consistent amount of repair material is applied to the splines.
  • those portions of the overlay not attached by the weld i.e., those portions contacting the pressure face of the splines, are easily removed during machining operations.
  • machining involves machining the pressure face of the spline to provide a smooth surface comprised of as-manufactured shaft material.
  • the non-pressure face is also machined to remove excess repair material where the overlay was welded to provide the desired contour and dimensions of the spline.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Earth Drilling (AREA)
US11/104,171 2005-04-12 2005-04-12 Repaired spline and seal teeth on mated components Abandoned US20060228219A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US11/104,171 US20060228219A1 (en) 2005-04-12 2005-04-12 Repaired spline and seal teeth on mated components
EP06251916.0A EP1712736A3 (en) 2005-04-12 2006-04-05 Repaired spline and seal teeth on mated components
JP2006107041A JP2006291358A (ja) 2005-04-12 2006-04-10 噛合い構成部品上の補修スプライン及びシール歯
CA002542677A CA2542677A1 (en) 2005-04-12 2006-04-11 Repaired spline and seal teeth on mated components
BRPI0601539-5A BRPI0601539A (pt) 2005-04-12 2006-04-11 acanaladura e dente de vedação reparados de componentes acoplados
SG200807378-5A SG147412A1 (en) 2005-04-12 2006-04-12 Repaired spline and seal teeth on mated components
SG200602434A SG126875A1 (en) 2005-04-12 2006-04-12 Repaired spline and seal teeth on mated components

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/104,171 US20060228219A1 (en) 2005-04-12 2005-04-12 Repaired spline and seal teeth on mated components

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US20060228219A1 true US20060228219A1 (en) 2006-10-12

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US11/104,171 Abandoned US20060228219A1 (en) 2005-04-12 2005-04-12 Repaired spline and seal teeth on mated components

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US (1) US20060228219A1 (pt)
EP (1) EP1712736A3 (pt)
JP (1) JP2006291358A (pt)
BR (1) BRPI0601539A (pt)
CA (1) CA2542677A1 (pt)
SG (2) SG126875A1 (pt)

Cited By (4)

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US20060225263A1 (en) * 2005-04-12 2006-10-12 General Electric Company Method of repairing spline and seal teeth of a mated component
US20060228573A1 (en) * 2005-04-12 2006-10-12 General Electric Company Overlay for repairing spline and seal teeth of a mated component
US20150217393A1 (en) * 2014-02-05 2015-08-06 Warren Martin Miglietti Method of repairing a transition duct side seal
WO2022109231A1 (en) 2020-11-23 2022-05-27 Caterpillar Inc. Method for remanufacturing internal spline components

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US20060225263A1 (en) * 2005-04-12 2006-10-12 General Electric Company Method of repairing spline and seal teeth of a mated component
US20060228573A1 (en) * 2005-04-12 2006-10-12 General Electric Company Overlay for repairing spline and seal teeth of a mated component
US7591057B2 (en) 2005-04-12 2009-09-22 General Electric Company Method of repairing spline and seal teeth of a mated component
US7687151B2 (en) * 2005-04-12 2010-03-30 General Electric Company Overlay for repairing spline and seal teeth of a mated component
US20150217393A1 (en) * 2014-02-05 2015-08-06 Warren Martin Miglietti Method of repairing a transition duct side seal
US9321115B2 (en) * 2014-02-05 2016-04-26 Alstom Technologies Ltd Method of repairing a transition duct side seal
WO2022109231A1 (en) 2020-11-23 2022-05-27 Caterpillar Inc. Method for remanufacturing internal spline components
DE112021005076T5 (de) 2020-11-23 2023-07-20 Caterpillar Inc. Verfahren zur refabrikation von innenkerbverzahnungskomponenten

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EP1712736A3 (en) 2014-04-16
EP1712736A2 (en) 2006-10-18
SG126875A1 (en) 2006-11-29
JP2006291358A (ja) 2006-10-26
BRPI0601539A (pt) 2006-12-05
SG147412A1 (en) 2008-11-28

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