GB2401336A - Weld dressing by grinding - Google Patents

Weld dressing by grinding Download PDF

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Publication number
GB2401336A
GB2401336A GB0310357A GB0310357A GB2401336A GB 2401336 A GB2401336 A GB 2401336A GB 0310357 A GB0310357 A GB 0310357A GB 0310357 A GB0310357 A GB 0310357A GB 2401336 A GB2401336 A GB 2401336A
Authority
GB
United Kingdom
Prior art keywords
component
location member
grinding means
grinding
dressed
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.)
Withdrawn
Application number
GB0310357A
Other versions
GB0310357D0 (en
Inventor
Lindsay Hamilton Smith
Daniel John Walker
Darren Paul Dempsey
David Richard Willerton
Jonathan William Burkinshaw
Graham Wood
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
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 Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB0310357A priority Critical patent/GB2401336A/en
Publication of GB0310357D0 publication Critical patent/GB0310357D0/en
Publication of GB2401336A publication Critical patent/GB2401336A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
    • B23D79/02—Machines or devices for scraping
    • B23D79/021—Machines or devices for scraping for removing welding, brazing or soldering burrs, e.g. flash, on pipes or rods
    • B23D79/023—Machines or devices for scraping for removing welding, brazing or soldering burrs, e.g. flash, on pipes or rods internally
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • B24B27/04—Grinding machines or devices in which the grinding tool is supported on a swinging arm
    • 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
    • B24B5/06—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 internally

Abstract

An apparatus 20 for dressing a welded component to remove weld defects from the component includes a yoke (or location member) 22 which is adapted to be mounted in or on the component such that it is fixed relative to a surface 40 of the component. The apparatus further includes a grinding tool 28 which is mounted on the location member 22 and which is moveable relative to the location member towards or away from the surface 40 of the component. The apparatus also includes means for moving the grinding tool 28 through a path of movement which may be limited substantially to a weld defect in the surface 40 of the component.

Description

Weld Dressing Apparatus The invention relates to an apparatus and method
for weld dressing, which has particular application in the s dressing of defects in compressor drum assemblies for gas turbine engines.
Electron beam welding is used to join titanium alloy compressor drum assemblies for gas turbine engines for aircraft. During the welding process, it is possible that defects can arise on exterior or interior surfaces of the drum assembly and such defects require reworking operations to remove them. In relation to defects on internal surfaces of drum assemblies (underbeads) there are presently two main methods for their removal, namely localised hand dressing or machining of a full internal circumference of the components. Hand dressing is limited by restricted access to underbeads in many joints, leaving machining as the preferred option. However, this can expose further defects or machining induced damage may appear.
According to the invention there is provided apparatus for dressing welded components to remove weld defects therefrom, the apparatus including: a location member adapted for mounting in fixed Is relationship relative to a surface of a component to be dressed; grinding means for grinding the surface of the component, the grinding means being mounted on the location member and being moveable relative to the location member, towards or away from the surface of the component; and means for moving the grinding means through a path of movement which may be limited substantially to a weld defect in the surface of the component.
The apparatus may be for dressing an interior of a 3s generally annular component, the location member being adapted for mounting in a central bore of the component.
The component may be a part of a compressor drum assembly.
The grinding means is preferably mounted on an arm, the arm being attached to the location member. Preferably the arm is oriented substantially radially of the annular component. Preferably the arm is moveable relative to the location member in the generally radial direction of the component.
The grinding means may be pivotally mounted on the arm such that it may move in a limited arc, defining the path of movement over the surface of the component to be dressed.
The grinding means may include a drill having an abrasive tip. The tip may be between 5mm and 15mm in diameter.
The apparatus may further include a measuring means mounted on the location member, for measuring the distance from a fixed point on the location member to a surface of the component to be dressed. The measuring means may include an elongate member which may be mounted substantially radially and a transducer mounted on a radially outer part of the elongate member, a known distance from a centre of the annular component.
The apparatus may further include means for visually observing the grinding means as it grinds the surface to be dressed. These means may include a camera, which may be mounted on the arm, adjacent to the grinding means.
According to the invention there is further provided a method for dressing welded components to remove weld defects therefrom, the method including the steps of: mounting a location member in fixed relationship relative to a surface of the component to be dressed; mounting a grinding means for grinding a surface of the component on the location member; moving the grinding means towards a surface of the component; and moving the grinding means through a path of movement limited substantially to an area of a weld defect in the surface of the component.
The component may be generally annular, the location member being mounted in a central bore of the component.
The component may be a part of a compressor drum assembly.
The method may include the step of moving the grinding means through a limited arc path, passing over the weld defect.
The method may include the step of visually observing the grinding tool as it grinds the surface.
The method may include the step of measuring a distance from a fixed point on the location member to an undamaged surface of the component, and comparing this distance to a distance from the same fixed point to a IS surface of the weld defect.
An embodiment of the invention will be described for the purpose of illustration only with reference to the accompanying drawings in which: Fig. 1 is perspective view of a part of a gas turbine engine, illustrating the general shape and location of a compressor drum assembly; and Fig. 2 is a diagrammatic sectional view illustrating apparatus according to the invention in place within a compressor drum assembly.
Referring to Fig. 1, a generally annular intermediate pressure compressor 10 within a compressor assembly 12 includes a number of titanium alloy discs 14 and spacers 16. The discs 14 and spacers 16 are assembled using electron beam welding.
A generally annular high pressure compressor 18 of the compressor assembly 12 includes a number of discs 14 (which are also assembled by electron beam welding), but no spacers therebetween.
The electron beam welding process can result in defects on an external surface or an internal surface or the compressor drum assembly. Defects in the weld on the internal surface of the drum assembly (the underbead) can be difficult to remove because of limited access.
Conventionally, two methods are used: machining the full circumference of the weld using a vertical borer; or localised dressing by hand, using power tools.
Referring to Fig. 2, there is illustrated an apparatus according to the invention. The apparatus 20 is located on a disc 14 of a compressor drum assembly. The apparatus includes a yoke 22 which is mounted within a bore 24 of the compressor drum assembly, such that it is firmly fixed in place. Attached to the yoke 22 is a mounting arm 26 which extends in the radial direction of the compressor drum assembly.
The mounting arm 26 includes a pair of elongate slots 27 which engage respective pins 29 on the yoke 22. This allows the mounting arm 26 to move in the radial direction, inwardly and outwardly as indicated by the double headed arrow in Fig. 2.
On a radially outer end of the mounting arm 26, there is mounted grinding means in the form of a grinding tool 28. The grinding tool 28 is attached to the mounting arm 2Q by a pivotal mounting 30, which allows the grinding tool S to rotate relative to the arm 26, as indicated by the arrows in Fig. 2. The grinding tool includes a body 29 and an abrasive tip 31 which has a diameter of about lOmm.
Also mounted on the yoke 22 is a measuring arm 32 which also extends generally in the radial direction. A transducer 34 is mounted on a radially outer end of the measuring arm 32. The measuring arm 32 is pivotally mount d on the yoke at a centre point 36 of the compressor drum assembly and is able to pivot in a controlled manner about this point.
camera 38 is mounted on the mounting arm 26 adjacent to the grinding tool 28. The camera 38 may be adjusted s Oh hat its view may be selected.
The apparatus may be used to dress a defect on an underbead (internal surface) weld on the compressor drum assembly. The measuring arm 32 is initially moved such that the transducer 34 is located adjacent to an unwelded part of the internal surface of the compressor drum assembly. This gives a measurement indicating a datum point to which the surface of the weld may be compared.
The grinding tool 28 may then be moved such that it is located near a weld defect on an internal surface 40 of the drum assembly and, using the camera to view the operation, the grinding tool 28 may be moved through a limited arc by pivoting it about the pivotal mounting 30. In this way, the grinding tool 28 may be used to remove the weld defect.
At any chosen point, the measuring arm 32 may be moved to the weld defect in order to provide an indication of the depth of the weld. This avoids machining away excess material. The data relating to the width and depth of the dressing of the weld may be retained and assist with analysis of the overall integrity of the structure.
There is thus provided an apparatus which may be used SO to dress welds in a controlled and limited manner. As may be seen from Fig. l, the space between the discs particularly in the high pressure compressor is very limited (around 25mm). Thus hand dressing is extremely difficult and visibility is very limited. The invention overcomes this problem by providing a mounting for a grinding tool 28 and a camera 38 to allow the grinding operation to be viewed. This avoids lengthy set up times and removes any potential for damage to the component. The surface finish achieved is at least as good as that achieved with current methods and the whole process is relatively quick.
Various modifications may be made to the above described embodiment without departing from the scope of the invention. Light may be introduced to the dressing area via a light source cable which may be positioned in any suitable place. Alternatively, the light may be provided by the camera unit. Instead of the camera unit, it may be possible to view the dressing process by industrial binoculars. Instead of a transducer or other electronic probe for measuring distance, a mechanical probe could be used.
Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.

Claims (17)

1. Apparatus for dressing welded components to remove weld defects therefrom, characterized in that the apparatus includes: a location member (22) adapted for mounting in fixed relationship relative to a surface (40) of a component (14, 16) to be dressed; grinding means (28) for grinding the surface (40) of the component, the grinding means (28) being mounted on the location member (22) and being moveable relative to the location member, towards or away from the surface (40) of the component; and means for moving the grinding means (28) through a path of movement which may be limited substantially to a weld defect in the surface (40) of the component.
2. Apparatus according to claim 1, the apparatus being for dressing an interior of a generally annular component (14, 16) and the location member (22) being adapted for mounting in a central bore (24) of the component.
3. Apparatus according to claim 2, the grinding means being mounted on an arm (29) which is attached to the location member (22) and is oriented substantially radially of the annular component (14, 16).
4. Apparatus according to claim 3, wherein the arm (26) is moveable relative to the location member (22) in the generally radial direction of the component.
5. Apparatus according to Claim 3 or Claim 4, wherein the grinding means (28) is pivotally mounted on the arm such that it may move in a limited arc, defining the path of movement over the surface (40) of the component to be dressed.
6. Apparatus according to any of claims 3 to 5, wherein the grinding means includes a drill (28) having an abrasive tip (31) between 5mm and 15mm in diameter.
7. Apparatus according to any of claims 3 to 6, wherein the apparatus further includes a measuring means (32, 34) mounted on the location member (22) , for measuring the distance from a fixed point on the location member to a surface of the component to be dressed.
s
8. Apparatus according to claim 7, the measuring means including an elongate member (32) mounted substantially radially and a transducer (34) mounted on a radially outer part of the elongate member, a known distance from a centre of the annular component.
IO
9. Apparatus according to claims 3 to 8, the apparatus further including means for visually observing the grinding means as it grinds the surface to be dressed.
10. A method for dressing welded components to remove weld defects therefrom, the method being characterized in including the steps of: mounting a location member (22) in fixed relationship relative to a surface (40) of the component (14, 16) to be dressed; mounting a grinding means (28) for grinding a surface (40) of the component on the location member; moving the grinding means (28) towards a surface (40) of the component; and moving the grinding means (28) through a path of movement limited substantially to an area of a weld defect 2s in the surface of the component.
11. A method according to claim 10, wherein the component is generally annular, the location member being mounted in a central bore (24) of the component.
12. A method according to claim 10 or claim 11, the method including the step of moving the grinding means (28) through a limited arc path, passing over the weld defect.
13. A method according to any of claims 10 to 12, the method including the step of visually observing the grinciing tool (28) as it grinds the surface (40).
3s
14. method according to any of claims 10 to 13, the methci including the step of measuring a distance from a fixed point on the location member to an undamaged surface of the component, and comparing this distance to a distance from the same fixed point to a surface of the weld defect.
15. Apparatus substantially as herein described with reference to Fig. 2 of the drawings.
16. A method substantially as herein described with reference to Fig. 2 of the drawings.
17. Any novel subject matter or combination including novel subject matter disclosed herein, whether or not within the scope of or relating to the same invention as any of the preceding claims.
GB0310357A 2003-05-07 2003-05-07 Weld dressing by grinding Withdrawn GB2401336A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0310357A GB2401336A (en) 2003-05-07 2003-05-07 Weld dressing by grinding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0310357A GB2401336A (en) 2003-05-07 2003-05-07 Weld dressing by grinding

Publications (2)

Publication Number Publication Date
GB0310357D0 GB0310357D0 (en) 2003-06-11
GB2401336A true GB2401336A (en) 2004-11-10

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Family Applications (1)

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GB0310357A Withdrawn GB2401336A (en) 2003-05-07 2003-05-07 Weld dressing by grinding

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GB (1) GB2401336A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768307A (en) * 1971-06-28 1973-10-30 Republic Steel Corp Welding flash detector
US4085505A (en) * 1976-11-15 1978-04-25 Mcelroy Arthur H Polyethylene internal bead remover
GB1508544A (en) * 1976-07-09 1978-04-26 Elektros Z Tyazhel Mash Apparatus for removing internal circular flash from butt-welded pipes
JPS61203272A (en) * 1985-03-05 1986-09-09 Osaka Fuji Kogyo Kk Bead grinding amount detector for uoe steel pipe
US4822221A (en) * 1987-06-15 1989-04-18 Mcdermott Incorporated Internal flash removal unit
US5175964A (en) * 1991-07-26 1993-01-05 Girndt Richard J Method and apparatus for removing flaws from internal pipe walls
WO1995024980A1 (en) * 1994-03-16 1995-09-21 Helmar Haas Device for removing projecting objects inside a pipe
DE29521288U1 (en) * 1994-03-16 1997-02-13 Haas Helmar Device for removing protruding objects inside a pipe
JPH10160451A (en) * 1996-11-26 1998-06-19 Sumitomo Metal Ind Ltd Device for discriminating cause of abnormality of butt weld part
US5899795A (en) * 1996-12-19 1999-05-04 Penza; G. Gregory Multi-function pipeline weld removal apparatus

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768307A (en) * 1971-06-28 1973-10-30 Republic Steel Corp Welding flash detector
GB1508544A (en) * 1976-07-09 1978-04-26 Elektros Z Tyazhel Mash Apparatus for removing internal circular flash from butt-welded pipes
US4085505A (en) * 1976-11-15 1978-04-25 Mcelroy Arthur H Polyethylene internal bead remover
JPS61203272A (en) * 1985-03-05 1986-09-09 Osaka Fuji Kogyo Kk Bead grinding amount detector for uoe steel pipe
US4822221A (en) * 1987-06-15 1989-04-18 Mcdermott Incorporated Internal flash removal unit
US5175964A (en) * 1991-07-26 1993-01-05 Girndt Richard J Method and apparatus for removing flaws from internal pipe walls
WO1995024980A1 (en) * 1994-03-16 1995-09-21 Helmar Haas Device for removing projecting objects inside a pipe
DE29521288U1 (en) * 1994-03-16 1997-02-13 Haas Helmar Device for removing protruding objects inside a pipe
JPH10160451A (en) * 1996-11-26 1998-06-19 Sumitomo Metal Ind Ltd Device for discriminating cause of abnormality of butt weld part
US5899795A (en) * 1996-12-19 1999-05-04 Penza; G. Gregory Multi-function pipeline weld removal apparatus

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DE 29521288 U (HAAS) 13.02.97 & WPI Abstract Accession No. 96-020250/02 *
JP 10160451 (OKAMOTO) 19.06.98 & WPI Abstract Accession No. 98-402007/35 *
JP 61203272 (YOSHIDA) 09.09.86 & WPI Abstract Accession No. 86-276599/42 *

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Publication number Publication date
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