DEVICE FOR POSITIONING AN INSPECTION TOOL 1
FIELD OF THE INVENTION
The present disclosure relates to a device for
5 positioning an inspection tool relative to a casing
flange, in particular for positioning an endoscope for
use in evaluating local deformations on a movable member
mounted inside the casing, and in particular for
evaluating erosion of blades of a movable member of a
10 turbine engine, such as the impeller of a centrifugal
compressor.
STATE OF THE PRIOR ART
In known manner, the erosion of a movable member
15 mounted inside a casing is evaluated using an inspection
tool, and in particular an endoscope.
Such maintenance inspection is particularly 1velcome
when the movable member is incorporated in a turbine
engine, the member then being subjected to high levels of
20 mechanical stress as a result of the high speed at 11hich
the member typically revolves. This observation is even
more relevant 11hen such a turbine engine has a
centrifugal compressor, as is typically true of a
helicopter engine, the impeller of the compressor being
25 subjected to high levels of stress centrifugally, 11ith
the impact thereof on the blades of said impeller needing
to be inspected periodically. As an example of a
centrifugal compressor, reference may be made by 1·1ay of
example to international patent application
30 WO 2012/160290 A1 filed by the Applicant.
Furthermore, and in kno11n manner, a casing is
subdivided axially into a plurality of segments that are
assembled together in pairs by flanges incorporated at
the ends of said segments. Under such circumstances, in
35 order to position the inspection tool on the casing, a
1 Translation of the title as established ex officio.
2
conventional solution consists in removing some of the
assembly bolts bet1·1een t1vo adjacent flanges, and then in
repositioning the bolts with a positioning device
suitable for being interposed between the bolts and one
5 of the t1vo flanges. Once that assembly operation has
been completed, it enables the device to position the
inspection tool facing an opening in the casing, which
opening is opened in order to perform the inspection.
Thus, in that conventional solution, the performance
10 of the positioning device depends directly on the
constraints imposed by the above-mentioned assembly
screws, which can be disadvantageous in many respects.
In particular, the step of placing the positioning
device on the casing involves steps of removing said
15 bolts and then putting them back into place, which steps
can be lengthy and difficult to perform, in particular
when the bolts are difficult to access, as often happens
with turbine engines, and that can have an impact on the
overall time needed to perform the inspection.
20 In addition, the accuracy with which the inspection
tool is positioned relative to the opening of the casing
is determined by the bolts, and their assembly clearance
is often too great for obtaining accuracy that is
satisfactory for inspection purposes.
25 Consequently, there exists a need to develop a
positioning device that provides better performance.
SUMMARY OF THE INVENTION
A first aspect of the present disclosure relates to
30 a device for positioning an inspection tool relative to a
flange of a casing presenting an axis of revolution, a
circumferential surface, and two faces perpendicular to
the axis of revolution. The device comprises first and
second positioning parts that are dissociated from each
35 other; and assembly means for assembling said parts
together. The first part comprises a fastener portion
suitable for being fastened on one of the two faces of
3
the flange. The second part includes a hole defining a
reference axis for positioning the inspection tool; and a
positioning surface suitable for co-operating with the
circumferential surface of the flange by positioning the
5 reference axis so that it intersects the axis of
revolution. The first and second parts have respective
setting surfaces suitable for co-operating together by
positioning the reference axis perpendicularly to the
axis of revolution.
10 Thus, the first part of the device may be assembled
permanently with the flange of the casing, while the
second part of the device can be designed to be removable
and to be assembled only temporarily with the flange via
the first part. Under such circumstances, inspection can
15 easily be performed without disassembling parts of the
engine. In particular, there is no need to remove and
subsequently replace some of the bolts used for
assembling the flange with an adjacent flange of another
segment of the casing each time it is desired to perform
20 an inspection. It suffices to assemble the first part
once and for all with these flanges, and then to engage
and disengage the second part each time it is desired to
perform an inspection.
Furthermore, the accuracy Hith which the reference
25 axis for the inspection tool is positioned can be better
decorrelated from the above-mentioned assembly clearances
of bolts, with accuracy being ensured by the positioning
surface and by the respective setting surfaces, thereby
enabling the reference axis to be accurately oriented
30 both perpendicularly and so as to intersect the axis of
revolution of the flange. These surfaces may also
provide better stiffness for the assembly. The accuracy
with which the reference axis is positioned can thus be
improved.
35 In certain embodiments, the assembly means may
comprise means for clamping together respective setting
surfaces in the direction of the axis of revolution,
4
thereby enabling any clearance between these two surfaces
in this direction to be taken up and thereby further
improving the accuracy with \'lhich the reference axis is
positioned.
5 In certain embodiments, the assembly means may
comprise clamping means for clamping together the
positioning surface and the circumferential surface in
the direction of the reference axis, thus making it
possible to take up any clearance between these two
10 surfaces in this direction and thus further improve the
accuracy with which the reference axis is positioned.
In certain embodiments, the assembly means may
comprise· a threaded rod presenting a threaded portion
suitable for being screwed in the second part, and an end
15 suitable for co-operating with a mark incorporated with
the first part in order to fasten the first and second
parts together. Thus, the first and second parts may be
assembled together and separated from each other by
moving the threaded rod in the second part in order to
20 engage and disengage co-operation between the end of the
rod and the mark.
In certain embodiments, the threaded rod may present
a rod axis suitable for being positioned obliquely
relative to the reference axis and to the axis of
25 revolution. Thus, the traction force exerted by the end
of the threaded rod on the mark can simultaneously
comprise a first component parallel to the reference axis
and another component parallel to the axis of revolution.
Under such circumstances, the assembly means may comprise
30 a single threaded rod for assembling together the first
and second parts. In certain embodiments, said rod axis
may be contained in a plane parallel to the plane formed
by the reference axis and by the axis of revolution. In
certain embodiments, these two planes may coincide.
35 In certain embodiments, the mark and the end of the
threaded rod may present respective frustoconical shapes
suitable for co-operating together to fasten the first
5
and second parts together. Such frustoconical shapes can
in particular make it easier to achieve the abovementioned
oblique contact. In particular, advantage can
be taken of such shapes to prevent the second part
5 becoming locked relative to the first part other than in
a precise position for achieving optimum positioning of
the reference axis.
In certain embodiments, the first part may present a
guide portion in line 1-1i th the mark for the purpose of
10 guiding the end of the threaded rod tmvards the mark,
thereby making it easier to initiate co-operation between
the end of the rod and the mark v1hile assembling together
the first and second parts.
In certain embodiments, the first part may be
15 suitable for being fastened on the flange in at least two
distinct assembly configurations, the transition from one
assembly configuration to the other taking place by
rotating the first part through 180° about the reference
axis. Thus, the first part may be fastened equally 1·1ell
20 on a flange face opposite from the opening of the casing
or on a flange face facing the opening, in the direction
defined by the axis of revolution. The cost of an
inspection requiring mounting in either of these t1-10
configurations can thus be reduced by such
25 standardization of the first part.
In certain embodiments, the first part may be plane.
In certain embodiments, the positioning surface may
be discontinuous.
A second aspect of the present disclosure provides
30 an assembly comprising a casing flange assembled with a
device of the above-specified first aspect.
A third aspect of the present disclosure provides a
turbine engine including a movable member mounted to
rotate in a casing that is provided with an assembly in
35 accordance with the second above-mentioned aspect.
In certain embodiments, the turbine engine may
include a centrifugal compressor, and the movable member
6
may comprise an impeller incorporated in the centrifugal
compressor.
The above-mentioned characteristics and advantages,
and others, appear more clearly on reading the foll011ing
5 detailed description of embodiments having no limiting
character and that are proposed merely by 11ay of
illustration. The detailed description refers to the
accompanying drawings.
10 BRIEF DESCRIPTION OF THE DRAWINGS
15
The accompanying drawings are diagrammatic and not
to scale, seeking above all to illustrate the principles
set out in the present disclosure.
drawings:
In the accompanying
Figure 1 is an exploded view of a positioning
device in accordance 11ith the present disclosure;
Figure 2 is an expLoded view of the device viewed
from a different angle;
Figure 3 is a perspective view sh01·1ing the first
20 and second parts of the device being assembled together;
· Figure 4 is a perspective view showing the
positioning of the inspection tool on the second part,
once the second part has been assembled with the first
part;
25 · Figures 5A and 58 are section views on a plane
30
containing the axis of revolution of the flange and the
reference axis sh01ving a threaded rod screwed into the
second part in two distinct positions relative to a mark
incorporated in the first part;
· Figure 5C is an enlargement of a detail VC shown
in Figure 5A;
Figure 6 is a perspective view of the first part
and of the threaded rod in a non-assembled state; and
Figures 7 and 8 are plane views of the device,
35 respectively looking along directions VII and VIII shown
in Figure 4.
7
DETAILED DESCRIPTION OF EMBODIMENTS
In the embodiment shoHn (see in particular Figures 1
to 4), a device in accordance 1vith this embodiment is a
device 30 for positioning an inspection tool 130 relative
5 to a flange 10 of a casing 1 presenting an axis of
revolution Z, a circumferential surface 12, and tHo faces
14 and 16 perpendicular to the axis of revolution Z. The
device 30 has first and second positioning parts 40 and
70 that are dissociated from each other; and assembly
10 means 90 and 100 for assembling said parts 40 and 70
together. The first part 40 has a fastener portion 45
suitable for being fastened on one of the tHo faces 14
and 16 of the flange 10. The second part 70 includes a
hole 75 defining a reference axis X for positioning the
15 inspection tool 130; and it also has a positioning
surface 85 suitable for co-operating with the
circumferential surface 12 of the flange 10, positioning
the reference axis X so that it intersects the axis of
revolution Z. The first and second parts 40 and 70 have
20 respective setting surfaces 50 and 80 suitable for cooperating
together to position the reference axis X
perpendicularly to the axis of revolution Z.
In this embodiment, the casing 1 forms an integral
portion of a turbine engine having a movable member (not
25 shown) on which it is desired to inspect the state of
wear. For example, the turbine engine may be for
incorporating in a helicopter as an engine of the
helicopter, and it may include a centrifugal compressor.
The movable member may then comprise an impeller
30 rotatably mounted in the centrifugal compressor and
presenting a leading edge that needs to be inspected
regularly for its level of erosion. In this embodiment,
the axis of revolution Z of the flange 10 coincides Hith
an axis of revolution of the rotary member.
35 In this embodiment, the first part 40 is designed to
be fastened permanently on one of the t1vo faces 14 and 16
of the flange 10 incorporated at one end of a segment of
8
the casing 1. Specifically, the first part 40 is in the
form of a plate of thickness measured along the axis Z
and presenting two opposite radial surfaces. Thus, in
this embodiment, the first part 40 is designed to remain
5 permanently on this segment of the casing 1, even while
the engine is in operation. Furthermore, it is possible
by 1-1ay of example for the flange 10 to be arranged at an
air inlet of the engine, so that once the device 30 and
the inspection tool 130 are installed it is possible to
10 undertake an inspection at the air inlet. In addition,
in this embodiment, the first part 40 is designed to be
fastened to the flange 10 after the flange has already
been assembled with another adjacent flange incorporated
in another segment of the casing (not shown) . In this
15 embodiment, the fastener portion 45 of the first part 40
is suitable for being fastened against the face 16 of the
flange 10 using one or more bolts (in particular two
bolts, visible in Figure 8), suitable for passing through
through holes 42A to 42F formed in the fastener portion
20 45 (see Figure 6). Some of these through holes
(referenced 42C and 42D in Figure 6) present greater
respective dimensions in a direction extending
transversely to said holes so as to enable them to
receive the heads of bolts or nuts used for assembling
25 together adjacent flanges, without these bolts
interfering with fastening the first part 40 on the
flange 10. In addition, other through holes (referenced
42A, 42B, 42E, and 42F in Figure 6) present smaller
respective dimensions in a direction transverse to said
30 holes so as to enable the heads of bolts for assembling
the first part 40 with the flange 10 to bear against the
edges of these holes. Thus, in this embodiment, the
first part 40 may be fastened to the flange 10 without
disassembling parts of the engine.
35 In this embodiment, the fastener portion 45 has a
first face suitable for being pressed against the face 16
of the flange 10 so that the first face is positioned
9
parallel to the face 16 when the first part 40 is
fastened against this face 16. Furthermore, in this
embodiment, the first part 40 presents a second face 50
(see Figure 2) that is opposite and parallel to the first
5 face and that defines a setting surface for the first
part 40.
In this embodiment, the first part 40 is suitable
for being fastened to the flange 10 in at least two
distinct assembly configurations, 1-1ith the transition
10 from one assembly configuration to the other taking place
by turning the first part 40 through 180° about the
15
reference axis X. In addition, in this embodiment, the
first part 40 is plane. It presents a first plane of
symmetry that is to be perpendicular to the axis of
revolution Z, Hith the first part 40 fastened to the
flange 10. Furthermore, in this embodiment, the first
part 40 presents a second plane of symmetry,
perpendicular to the setting surface 50. This second
plane of symmetry is thus perpendicular to the first
20 plane of symmetry and is to be parallel to the plane
formed by the reference axis X and the axis of revolution
Z Hhen the first part 40 is fastened to the flange 10 and
the second part 70 is assembled \·lith the first part 40.
Furthermore, as shoHn in Figure 3, the second part
25 70 is assembled temporarily \•lith the first part 40, and
is then removed, each time it is desired to perform an
inspection operation.
In this embodiment, the second part 70 is positioned
relative to the first part 40 and to the flange 10 by
30 using the positioning surface 85 and the setting surface
80 of the second part 70.
In this embodiment, the positioning surface 85 is
such that it is possible to define a cylinder that is
tangential to said positioning surface 85 at at least two
35 points of contact with the surface, said tangential
cylinder presenting an axis of revolution that intersects
the reference axis X. Specifically, the positioning
10
surface 85 is oriented circumferentially relative to the
axis Z. In this example, the flange 10 may be modeled
geometrically as a cylinder presenting an axis of
revolution Z. Under such circumstances, the positioning
5 surface 85 is suitable for resting against the
circumferential surface 12 of the flange 10, at least at
the two above-mentioned points, by positioning the
reference axis X so that it intersects the axis of
revolution Z.
10 In addition, in this embodiment, the positioning
surface 85 is discontinuous (nevertheless, provision
could be made for a surface that is continuous without
going beyond the scope of the present disclosure) . In
this embodiment, the positioning surface 85 is
15 constituted by a plurality of faces. More precisely, in
this embodiment, the positioning surface 85 is
constituted by a pair of faces that are at a distance
from each other, and that together form the two branches
of a V-shape against which the circumferential surface 12
20 of the flange 10 is suitable for resting (see Figures 1
and 7).
Furthermore, in this embodiment, the setting surface
80 of the second part 70 is designed to be plane so as to
be capable of establishing plane-against-plane thrust
25 against the setting surface 50 of the first part 40 when
these two parts are assembled together (see Figure SA).
In this embodiment, the plane of the setting surface 80
is configured to extend perpendicularly to the axis of
revolution Z of the flange 10 when the first and second
30 parts 40 and 70 are assembled together and the first part
40 is fastened to the flange 10. In addition, the plane
of the setting surface 80 extends parallel to the
reference axis X. Under such circumstances, the
respective setting surfaces 50 and 80 are suitable for
35 co-operating together while positioning the reference
axis X perpendicularly to the axis of revolution Z when
the first and second parts 40 and 70 are assembled
11
together and the first part 40 is fastened to the flange
10.
Furthermore, the positioning device 30 has assembly
means 90 and 100 for assembling the first and second
5 parts 40 and 70 together. In this embodiment, the
assembly means 90 and 100 comprise a threaded rod 100
presenting a threaded portion 102 suitable for being
screwed into the second part 70, and an end 104 suitable
for co-operating with a mark 90 incorporated in the first
10 part 40 so as to fasten the first and second parts 40 and
70 together {see in particular Figures SA to 5C) . In
particular, in this embodiment, the second part 70
presents a tapped hole 77 into which the threaded portion
102 of the threaded rod 100 is screwed, the end 104
15 projecting from a first edge of the hole 77 so as to be
capable of co-operating with the mark 90. Thus, in this
embodiment, moving the threaded rod 100 in the hole 77 by
a screwing/unscrewing operation serves to vary the
projecting length of the end 104. In this embodiment, in
20 order to make this operation easier, the threaded rod 100
presents another end 106 opposite from the end 104 that
projects from the opposite edge of the hole 77 and that
is threaded so as to be suitable for being constrained to
turn with a knob 110 that is held on by a nut 114.
25 Furthermore, in this embodiment, the threaded rod
100 presents a rod axis T that is suitable for being
positioned obliquely relative to reference axis X and to
the axis of revolution Z. More particularly, in this
embodiment, the rod axis T is suitable for being
30 contained in a plane parallel to the reference axis X and
to the axis of revolution z, in particular a plane
containing the reference axis X and the axis of
revolution Z. Furthermore, in this embodiment, the rod
axis T forms an angle 8 with the reference axis X that
35 lies in the range 10° to 70°, and in particular in the
range 15° to 50°.
12
In this embodiment, the mark 90 is concave in shape.
Nevertheless, without going beyond the scope of the
present disclosure, it would be possible to provide a
shape that is convex, providing only that the end 104 of
5 the threaded rod 100 is suitable for co-operating with
the mark 90 in order to fasten the first and second parts
40 and 70 together. Furthermore, in this example, the
mark 90 presents an axis of symmetry that coincides with
the rod axis T when the first and second parts 40 and 70
10 are assembled together. Nevertheless, 1vi thout going
beyond the scope of the present disclosure, it would be
possible to provide a mark 90 of a shape other than that
described above, providing only that the end 104 of the
threaded rod 100 is suitable for co-operating with the
15 mark 90 in order to assemble the first and second parts
40 and 70 together.
In addition, in this embodiment, the mark 90 and the
end 104 of the threaded rod 100 present respective
frustoconical shapes {portions of truncated cones)
20 suitable for co-operating together to fasten the first
and second parts 40 and 70 together. In this embodiment,
each of these t1vo frustoconical shapes presents an axis
of symmetry that coincides with the rod axis T.
Furthermore, in this embodiment, each of these t1-10
25 frustoconical shapes presents a half-angle at the apex
lying in the range 15° to 70°, and in particular in the
range 20° to 60°. Thus, the supplementary angle A of
this half-angle, as shown in Figure 5C, lies in the range
110° to 165°, and in particular in the range 120° to
30 160°. In addition, in this example, the truncated cone
portion defining the mark 90 presents a larger radius Rl
and the truncated cone portion defining the end 104
presents a larger radius rl, each of which lies in the
range 3 millimeters {mm) to 7 mm, with a difference Rl-rl
35 lying in the range 0.5 mm to 2 mm. Likewise, in this
example, the truncated cone portion defining the mark 90
presents a smaller radius R2 and the truncated cone
13
portion defining the end 104 presents a smaller radius r2
each of which lies in the range 1 mm to 5 mm, with a
difference R2-r2 lying in the range 0.1 mm to 1.5 mm.
Furthermore, in this embodiment, the first part 40
5 presents a guide portion 95 in line with the mark 90 for
the purpose of guiding the end 104 of the threaded rod
100 to1·1ards the mark 90. In this example, this guide
portion 95 is concave in shape. Nevertheless, without
going beyond the scope of the present disclosure, it
10 would be possible for it to have a shape that is convex,
provided only that the end 104 of the threaded rod 100
can be guided by the guide portion to the mark 90. In
addition, in this embodiment, the guide portion 95
presents an axis of symmetry that coincides 1-1ith the rod
15 axis T when the first and second parts 40 and 70 are
assembled together. Furthermore, in this embodiment, the
guide portion 95 presents a cylindrical shape (it is a
portion of a cylinder) of radius equal to the larger
radius R2 of the truncated cone portion defining the mark
2 0 90. Nevertheless, 1vi thout going beyond the scope of the
present disclosure, the guide portion 95 could have a
shape other than that described above, provided only that
the end 104 of the threaded rod 100 can be guided by the
guide portion to the mark 90. Furthermore, the
25 respective shapes of the mark 90 and/or of the guide
portion 95 may advantageously, although not necessarily,
be optimized in order to avoid particles of powder
accumulating in these shapes, in particular when an
inspection is to be made at an engine air inlet, as
30 mentioned above.
Furthermore, in this embodiment (see in particular
Figures 1, 2, and SA), the second part 70 presents an
overall shape in the form of a bracket having t1·10 arms 73
and 81, the hole 75 defining the reference axis X being
35 made in a first one 73 of these tHo arms, while the
setting surface 80 and the positioning surface 85 are
defined on the second arm 81. More particularly, in this
14
embodiment, the second arm 81 presents a first notch
extending in a plane perpendicular to the axis of
revolution Z. This first notch enables two mutually
parallel plane internal surfaces 80 and 82 to be defined
5 facing each other and perpendicular to the axis of
revolution Z, one of these two internal surfaces defining
the setting surface 80. These two internal surfaces make
it easier to guide the second part 70 towards its mounted
position while assembling the first and second parts 40
10 and 70 together. Furthermore, in this embodiment, the
positioning surface 85 is defined in a distal end of the
second arm 81 (relative to the first arm 73) . In this
embodiment, the second arm 83 presents a second notch
that extends in a plane perpendicular to the plane in
15 which the first notch extends so as to leave room for
passing the second end 104 of the threaded rod 100. In
this embodiment, it is the second notch that is
responsible for the discontinuity presented by the
positioning surface 85.
20 There follows a description in greater detail of
using the positioning device 30 to carry out an
inspection.
As explained above, the first step consists in
temporarily assembling the second part 70 with the first
25 part 40 which has itself already been fastened in
permanent manner on the flange 10.
To do this, and as shown in Figures 3 and SA, it is
necessary to begin by using the knob 110 to screw the
threaded rod 100 in sufficiently for the end 104 of the
30 rod to project far enough to be engaged in the guide
portion 95 once the second part 70 is correctly
positioned relative to the first part 40.
Thereafter, it is necessary to screw the threaded
rod 100 out so that the end 104 projects less and less
35 from the hole 77, so that after being guided by the guide
portion 95 it becomes inserted into the mark 90 and ends
up by being clamped against the mark 90 as a result of
15
the traction force generated by the threaded rod 100 and
as a result of the matching shapes of the mark 90 and of
the end 104, as can be seen in Figure 5B. In this
configuration, this clamping force has a first component
5 along the direction of the reference axis X, thereby
clamping the positioning surface 85 and the
circumferential surface 12 against each other along the
direction of the reference axis X; and a second component
along the direction of the axis of revolution Z, thereby
10 clamping the respective setting surfaces 50 and 80
against each other in the direction of the axis of
revolution Z. Thus, in a positioning device 30 as
configured in this way, the assembly means 90 and 100
comprise means for clamping together the respective
15 setting surface 50 and 80 in the direction of the axis of
revolution Z, and means for clamping together the
positioning surface 85 and the circumferential surface 12
in the direction of the reference axis X.
In addition, as shown in Figure 3, once the first
20 and second parts 40 and 70 have been assembled together,
the hole 75 defining the reference axis X is correctly
positioned facing an opening 3 in the casing 1, which
opening is opened specifically for inspection purposes.
As shown in Figure 4, the second step consists in
25 positioning the inspection tool 130 by causing the
optical sighting axis of the tool to coincide with the
reference axis X. In this embodiment, this is done by
mounting the inspection tool 130 in a cylindrical sleeve
140 that is itself mounted in the hole 75. Furthermore,
30 in this embodiment, the inspection tool 130 comprises an
endoscope presenting an optical axis defining the
sighting axis of the inspection tool 130.
Once this second step has been completed, a third
step may be performed that corresponds to the inspection
35 step proper. During this stage, by using the positioning
device 30, the optical axis is appropriately positioned
perpendicularly so as to intersect the axis of revolution
16
of the flange 10, which is also the axis of revolution of
the movable member for inspection.
Finally, once this third step has been completed, in
order to terminate the inspection, it suffices to remove
5 the inspection tool 130 and then the second part 70 in a
manner opposite to that described above respectively for
the second and first steps.
The embodiments described in the present description
are given by way of non-limiting illustration, and in the
10 light of this description, a person skilled in the art
can easily modify these embodiments or envisage others,
while remaining within the scope of the invention.
Furthermore, the various characteristics of these
embodiments can be used singly or in combination with one
15 another. When they are combined, these characteristics
may be combined as described above or in other 1·1ays, the
invention not being limited to the specific combinations
described in the present description. In particular,
unless specified to the contrary, any characteristic
20 described 1·1ith reference to any embodiment may be applied
in analogous manner to any other embodiment.

CLAIMS
1. A device (30) for positioning an inspection tool (130)
relative to a flange (10) of a casing (1) presenting an
axis of revolution (Z), a circumferential surface (12),
5 and two faces (14, 16) perpendicular to the axis of
revolution (Z), the device being characterized in that:
· the device (30) comprises first and second
positioning parts (40, 70) that are dissociated from each
other; and assembly means (90, 100) for assembling said
10 parts (40, 70) together;
· the first part (40) comprises a fastener portion
(45) suitable for being fastened on one of the two faces
(14, 16) of the flange (10);
· the second part (70) includes a hole (75) defining
15 a reference axis (X) for positioning the inspection tool
(130); and a positioning surface (85) suitable for cooperating
with the circumferential surface (12) of the
flange (10) by positioning the reference axis (X) so that
it intersects the axis of revolution (Z); and
20 · the first and second parts (40, 70) have
respective setting surfaces (50, 80) suitable for cooperating
together by positioning the reference axis (X)
perpendicularly to the axis of revolution (Z) .
25 2. A device (30) according to claim 1, wherein the
assembly means (90, 100) comprise means for clamping
together respective setting surfaces (50, 80) in the
direction of the axis of revolution (Z).
30 3. A device (30) according to claim 1 or claim 2, wherein
the assembly means (90, 100) comprise clamping means for
clamping together the positioning surface (85) and the
circumferential surface (12) in the direction of the
reference axis (X) .
35
4. A device (30) according to any one of claims 1 to 3,
wherein the assembly means (90, 100) comprise a threaded
18
rod (100) presenting a threaded portion (102) suitable
for being screwed in the second part (70), and an end
(104) suitable for co-operating with a mark (90)
incorporated with the first part (40) in order to fasten
5 the first and second parts (40, 70) together.
5. A device (30) according to claim 4, wherein the
threaded rod (100) presents a rod axis (T) suitable for
being positioned obliquely relative to the reference axis
10 (X) and to the axis of.revolution (Z) .
. 6. A device (30) according to claim 4 or claim 5, wherein
the mark (90) and the end (104) of the threaded rod (100)
present r'especti ve frustoconical shapes sui table for co-
15 operating together to fasten the first and second parts
(40, 70) together.
7. A device (30) according to any one of claims 4 to 6,
wherein the first part (40) presents a guide portion (95)
20 in line with the mark (90) for the purpose of guiding the
end (104) of the threaded rod (100) towards the mark
( 90) .
8. A device (30) according to any one of claims 1 to 7,
25 wherein the first part (40) is suitable for being
fastened on the flange (10) in at least two distinct
assembly configurations, the transition from one assembly
configuration to the other taking place by rotating the
first part (40) through 180° about the reference axis
30 (X) .
9. A device (30) according to any one of claims 1 to 8,
wherein the first part (40) is plane.
35 10. A device (30) according to any one of claims 1 to 9,
wherein the positioning surface (85) is discontinuous.