Apparatus and method for aligning specimen axis with respect to axis of test stand

Abstract

The invention relates to a device (2) for aligning an axis (9) of a specimen (3) with respect to an axis (6) of a test stand (1), the device comprising: a first plate (11) configured to be fastened to a mounting plate (7) of the test stand (1); and comprising a second plate (12) configured for fastening the specimen (3); wherein the first plate (11) and the second plate (12) are arranged in a planar superimposed manner and are fastened by means of a fastening device (18); the fastening device (18) enables at least two fastening states, namely an aligned state and a fixed state, such that the two plates (11, 12) can be displaced parallel to each other in the aligned state and such that the two plates (11, 12) are fixed relative to each other in the fixed state; and wherein an adjusting device (22) is provided for displacing one of the two plates (11, 12) in parallel with respect to the other plate (11, 12) in the aligned state.

Description

Technical Field

[0001] The present invention relates to a device and a method for aligning a test piece axis relative to an axis of a test bench. Background Art

[0002] With the increasing use of electric motors as drives, for example, for motor vehicles, it is necessary to test and evaluate the drive characteristics of electric motors on test benches, just as it has long been the case with internal combustion engines. In order to keep interference to a minimum, it is necessary for the electric motor (test piece) to be tested to align its motor axis precisely with the axis of the test bench. The motor axis constitutes the geometric center axis or axis of rotation of the motor shaft. Correspondingly, the axis of the test bench constitutes the geometric center axis or axis of rotation of the test bench shaft. The term "axis" can therefore be understood as a geometric element that defines the corresponding position (lage) and alignment of the associated axis.

[0003] Incorrect alignment of the two axes (eg due to parallel offset or angular offset of the specimen axis relative to the test rig axis) may result in vibrations during subsequent testing, which may lead to measurement errors or damage to the specimen or the test rig.

[0004] The electric motor to be tested must therefore be mounted on the test bench with great precision. This requires a lot of effort in combination with repeated measurements and alignment corrections when assembling the electric motor.

[0005] During assembly and alignment of the test piece, the test bench is also stopped and cannot be used for other test tasks. Summary of the invention

[0006] Therefore, the object of the present invention is to provide a way to easily and conveniently align the axis of an electric motor used as a test piece with respect to the axis of a test bench.

[0007] The object according to the invention is achieved by a device having the features of the following technical solution and a method according to the following technical solution. In addition, a test bench system is provided, in which the device can be advantageously used. Advantageous embodiments are provided in the following technical solution.

[0008] A device for aligning the axis of a test piece relative to the axis of a test bench is provided, the device comprising: a first plate, which is configured to be fastened to a mounting plate of the test bench; and a second plate, which is configured to fasten the test piece; wherein the first plate and the second plate are arranged in a planarly superimposed manner and are fastened to each other by a fastening device; wherein the fastening device can achieve at least two fastening states, namely an alignment state and a fixed state, so that the two plates can be displaced parallel to each other in the alignment state, and the two plates are fixed relative to each other in the fixed state; and wherein an adjustment device is provided for displacing one of the two plates parallel to the other plate in the alignment state.

[0009] The device is therefore suitable for aligning the test piece axis with the test bench axis. In particular, if an electric motor with a motor shaft is provided as the test piece and a dynamometer with a corresponding dynamometer shaft is provided on the test bench side, this may involve the (geometric) axes of the corresponding shafts. The two axes and therefore also the shaft must be aligned with one another as accurately as possible in order to minimize axial or parallel offsets on the one hand and angular offsets on the other hand.

[0010] The device described comprises neither the test bench nor the test specimen itself. Instead, it serves as a junction between the test specimen and the test bench in order to fasten the test specimen to the test bench in a simple manner and acts as a kind of adapter. In particular, the device enables the test specimen to be aligned before it is even mounted on the test bench. As will be explained later, this makes it possible to first fasten the test specimen to the device and subsequently align it relative to the device. Thereafter, the aligned test specimen is fastened to the test bench together with the device. A subsequent realignment is unnecessary.

[0011] In particular, the specimen can be fastened to the second plate of the apparatus and subsequently aligned with the second plate relative to the first plate. The first plate is then fastened (assembled) to the test bench together with the second plate and the specimen carried thereby. Once the alignment is complete, the entire apparatus with the assembled and aligned specimen can be fastened to the assembly plate of the test bench as a single unit. Subsequent realignment is no longer necessary, since the specimen is already in the optimal position with the specimen axis aligned with the test bench axis.

[0012] The first plate and the second plate contact each other in a planar manner, i.e. they touch each other in a planar manner via corresponding flat contact surfaces. In the process, the plates do not have to be completely planar. They can also have different profiles and in particular different depths.

[0013] Only when the fastening device allows the aligned state, the two plates can be displaced relative to each other by means of the adjusting device, particularly parallel or rotational displacement required in the aligned state. In other cases, the fastening device fixes the two plates to each other so that the plates cannot be displaced relative to each other.

[0014] The displacement of the two plates relative to each other occurs in the contact surface, ie in the contact area where the two plates touch each other. The displacement includes both linear or parallel displacement and rotational twisting of the two plates relative to each other in the plane.

[0015] The test piece is initially mounted on the second plate. If the test piece is an electric motor, the electric motor can be fastened, in particular screwed, to the second plate via its front flange. Thereafter, the second plate is connected to the first plate, wherein the two plates can be fixed to each other by fastening means. Once the test piece has been assembled and aligned, the first plate can be fastened to the mounting plate of the test bench.

[0016] The fastening device can have at least one screw connection acting between the first plate and the second plate, wherein the screw connection is firmly tightened in a fixed state and is loosened in an aligned state so that the two plates can be displaced relative to each other. This means that the plates can always be kept adjacent to each other in a plane, wherein the plates are tightly pressed against each other by the screw connection in a fixed state so that they can no longer be displaced relative to each other. On the other hand, in an aligned state, the screw connection is loosened so that the two plates can be displaced relative to each other. Of course, there should still be a certain amount of friction between the two plates so that the plates do not lose contact with each other. For precise alignment, it is necessary that the plates are always in planar contact with each other and a certain amount of friction is generated between the two plates. It should be avoided that the plates are loosened or lifted from each other because this may cause the plates to tilt relative to each other so that the parallel displacement of the plates will no longer be guaranteed.

[0017] The adjustment device can be configured to generate a force between the first plate and the second plate for a relative displacement of the two plates. In particular, a force extending parallel to the contact surface between the two plates can be generated thereby. The adjustment device can be supported on one of the plates and exert a force on the other plate. This makes it possible to displace one plate relative to the other plate. For example, the displacement can include a parallel displacement and / or a rotation of the two plates relative to each other.

[0018] The adjusting device can have a plurality of screw connections, wherein at least one of the screw connections has a threaded seat that is fastened to one of the plates, wherein a screw-in bolt can be screwed inside the threaded seat, and wherein one end face of the screw-in bolt acts on one of the two plates to which the threaded seat is not fastened, whereby a force can be applied to the plate in question. The screw-in bolt is screwed into the thread of the threaded seat and, in particular, can be rotated in this thread like a screw connection. Turning the screw-in bolt causes it to move axially.

[0019] When the threaded bolt comes into contact with the plate on which it acts, a force acts on the end face of the threaded bolt on the plate in question, displacing it relative to the other plate.

[0020] The threaded seat and / or the screw-in bolt that can be screwed into the threaded seat can be arranged on the side of the corresponding plate, wherein the side is perpendicular to the contact surface of the two plates touching each other in a planar manner. Therefore, the force exerted by the screw-in bolt acts laterally on the plates and thus parallel to the contact surface of the two plates.

[0021] The geometric shape of the first plate and the second plate may each correspond to a plate-shaped cuboid, each cuboid having two plate surfaces parallel to one another and four side surfaces connecting the two plate surfaces, wherein the adjustment device may have eight screw connections, wherein two screw connections are respectively arranged on the side surfaces of the plate at a distance from one another. In each case, one of the plate surfaces is a contact surface relative to a corresponding contact surface of the respective other adjacent plate.

[0022] The geometric shape of the plates does not have to be strictly limited to being exactly cuboids. For example, an approximate cuboid with recesses or serrations is also feasible. The decisive factor is that the plates have four sides that are perpendicular or parallel to each other, so that the screw connections arranged thereon allow any movement of one plate relative to the other in a plane. Thus, in the case of a coordinate system, the plates can be linearly displaced or rotated in the x and y directions, but not in the z direction (which would mean that the two plates are lifted from each other).

[0023] Typically, the test piece may be an electric motor. The electric motor may here have a flange or a front flange surface, with which the electric motor may be fastened to the second plate.

[0024] A support frame may be provided, which is fastened to the second plate. The support frame may serve to reinforce the entire arrangement consisting of the first plate and the second plate. In particular, the support frame may serve to transport the device and the specimen mounted on the device. Furthermore, the support frame may be configured to support the specimen in order to avoid bending and transverse moments on the housing of the specimen or even on the specimen axis.

[0025] Support elements can be arranged on the support frame to support the test piece fastened to the second plate. For example, these support elements can be formed by support bolts or support columns, and in particular support the lower side of the support test piece to support it so that it can be reliably held and secured on the support frame.

[0026] The described device can be used particularly advantageously as an alignment device for aligning and securing a test piece in a test bench system known per se.

[0027] A test bench system is provided, comprising an electric motor, which is used as a test piece; a test bench, which is used to test the electric motor; a test bench shaft, to which the shaft of the electric motor can be fastened for transmitting the movement of the electric motor to the test bench; a mounting plate, which is arranged on the test bench and comprises a device of the above-mentioned type as an alignment device for fastening the electric motor to the mounting plate and aligning it with the mounting plate.

[0028] Such a test bench is known per se without the above-mentioned (alignment) device. Usually, it has a drive or load device, such as a dynamometer, the axis of which forms the test bench axis. The test bench axis constitutes a component of the test bench and can be coupled to the axis of the test piece, here the electric motor, for example by suitable couplings. In this way, the movement of the test piece and the load or drive device are precisely coupled to each other. In particular, the dynamometer can be operated as a load device and thus exert a load torque on the electric motor. In this way, standard drive situations can be simulated with the electric motor.

[0029] Additionally or alternatively, the dynamometer can also be operated as a drive device and apply a drive torque to the electric motor, which is not driven in this case. In this way, a braking operating mode can be realized. Of course, the electric motor used as a test piece can also be operated as a generator in order to apply a reverse braking load to the driving dynamometer. In this way, the braking characteristics of the test piece can be tested in the braking operating mode.

[0030] In particular, a so-called 4-quadrant operation can thus be achieved, in which the electric motor and the dynamometer can each be operated as a motor or generator in different combinations (motor-motor, motor-generator, generator-motor, generator-generator).

[0031] The test bench comprises a mounting plate to which the electric motor can be coupled. For this purpose, the above-mentioned alignment device can be used to align the electric motor in an optimal manner before the electric motor is mounted on the mounting plate. The electric motor is then fastened to the mounting plate together with the alignment device without any further subsequent adjustment or alignment measures being required.

[0032] The mounting plate can be plate-shaped, but can also be designed as a block or a frame. It is expedient for the mounting plate to have a mounting surface to which the alignment device can be fastened together with the electric motor.

[0033] In the alignment device, the first plate, the second plate, the electric motor fastened to the second plate and the support frame can constitute a preassembled unit, which can be fastened to the assembly plate as a single unit. Accordingly, as already explained above, the electric motor can initially be fastened to the second plate. Subsequently, the relative position of the second plate with respect to the first plate is adjusted so that the motor shaft of the electric motor, i.e. the axis of the electric motor, is exactly in the position it must be in relative to the first plate (parallel position, angular position) in order to achieve the smallest possible offset relative to the test bench later. The relative position of the two plates can be adjusted with the aid of a high-precision 3D measuring device.

[0034] The first and second plates are fastened to the support frame together with the electric motor, thereby forming a preassembled compact unit. Once the alignment, adjustment and fastening work has been completed, the unit can then be fastened to the assembly plate.

[0035] In particular, the first plate of the unit can be fastened to the mounting plate. For this purpose, a centering device can be provided to center the first plate relative to the mounting plate. For example, the centering device can have a centering pin so that the first plate can be fastened accurately to the mounting plate of the test bench.

[0036] Since the axis of the electric motor itself has been precisely aligned beforehand with the first plate, the axis of the electric motor is also exactly where it must be relative to the test bench axis in order to achieve the lowest possible offset or error.

[0037] A method for aligning an axis of a test piece relative to an axis of a test bench is provided, comprising the following steps:

[0038] - providing a first plate and a second plate;

[0039] - arranging the first plate and the second plate with their respective planar sides superimposed;

[0040] - fastening the test piece to the second plate;

[0041] - measuring the axis of the test piece and comparing the position of the axis with a predetermined reference position (position, angle) relative to the first plate;

[0042] - aligning the axis of the specimen relative to the first plate by displacing the second plate carrying the specimen relative to the first plate so as to minimize any deviation of the position of the axis from a reference position;

[0043] - Fasten the first plate to the second plate;

[0044] - fastening the support frame to the second plate so that the first plate, the second plate, the specimen and the support frame form a unit;

[0045] - Fasten the unit to the mounting plate of the test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] These advantages and features of the invention will be explained in more detail below based on examples with the aid of the accompanying drawings, in which:

[0047] Figure 1 shows a schematic side view of a test bench system with a test bench and an alignment device carrying a test piece shown only schematically in a cross-sectional view;

[0048] Figure 2 The perspective view from above shows Figure 1 The alignment device together with the test piece;

[0049] Figure 3 The perspective view from below shows Figure 2 The alignment device together with the test piece; and

[0050] Figure 4 The results show that the Figure 2 Alignment device. DETAILED DESCRIPTION

[0051] Figure 1 A side view of a schematic arrangement of a test bench system is shown, which has a test bench 1, which is only schematically shown, and an alignment device 2 according to the invention, to which an electric motor 3 serving as a test piece is fastened. The alignment device 2 serves not only to align the electric motor 3 relative to the test bench 1, but also to preassemble and subsequently fasten the electric motor 3 to the test bench 1.

[0052] The test bench 1 includes a dynamometer 4 as a load and a driving device. Figure 1 The dynamometer 4 is, for example, an electric motor which can be operated as a motor and a generator, with a motor shaft forming a test bench shaft 5. The dynamometer 4 and the test bench shaft 5 are arranged in a Figure 1 The drawings are not drawn to scale and are only used to explain the test bench system.

[0053] The position of the dynamometer 4 with the test bench shaft 5 also defines a test bench axis 6 , which corresponds to the center or axis of rotation of the test bench shaft 5 .

[0054] An element of the test bench 1 is also a mounting plate 7 to which the electric motor 3 is to be fastened for the test procedure.

[0055] The electric motor 3 in turn has a motor shaft 8 which defines a geometrical test axis 9 .

[0056] For the test process, the motor shaft 8 of the test piece (electric motor 3) is connected to the test bench shaft 5 of the dynamometer 4, for example via a suitable coupling. In the process, it is particularly important that the test piece axis 9 and the test bench axis 6 are precisely aligned with each other. Any offset, whether parallel or angular, will lead to eccentric running (unrundenLauf) during the test operation and impair the measurement results. In the worst case, if the degree of misalignment is too great, the test piece or the test bench may even be damaged.

[0057] An alignment device 2 is provided to facilitate alignment and to simplify the working process on the test bench.

[0058] The alignment device 2 has a support frame 10 , a first plate 11 and a second plate 12 .

[0059] Figure 2 and Figure 3 The alignment device 2 and the electric motor 3 are also shown in different perspectives. Figure 4 In FIG. 2 , the alignment device 2 is shown without the electric motor 3. Figures 1 to 4 The same alignment device 2 is shown throughout, so the following description refers to all figures.

[0060] The support frame 10 is designed as a stable angular body, comprising a base plate 13, a support wall 14 which is vertical when mounted on the test bench 1, and reinforcement ribs 15. For example, the elements of the support frame 10 can be formed as a welded construction or milled from solid material. In particular, the underside of the base plate 13 must be machined with high precision, because the support frame 10 can be slid on this underside onto a corresponding holder on the test bench 1, for example on a support stand provided on the test bench 1. Spring elements 16 are provided for precisely guiding the support frame, which can be inserted into corresponding groove recesses in the support stand of the test bench 1 (not shown).

[0061] The second plate 12 is fastened, for example by means of screw connections, to an end face of the support frame 10, in particular to an end face of the support wall 14. The first plate 11 lies flat on the second plate 12. The first plate 11 and the second plate 12 are connected to each other by screw connections forming a fastening means and can be screwed together securely.

[0062] The electric motor 3 is fastened to the second plate 12, for example, via a front flange provided on an end face of the housing of the electric motor 3. Furthermore, in particular the rear part of the electric motor 3 facing away from the second plate 12 is supported on the base plate 13 by a support element 17. This ensures that the electric motor 3 is reliably fastened to the support frame 10 and the second plate 12 during operation of the test rig, during which corresponding vibrations and force loads may occur at high rotational speeds.

[0063] The supporting frame 10 , the first plate 11 and the second plate 12 together with the electric motor 3 fastened thereto form a compact unit.

[0064] In order to align the specimen axis 9 of the electric motor 3, the second plate 12 can be displaced in the plane relative to the first plate 11. To this end, the fastening means 18 must first be loosened. To this end, the screws that screw the first plate 11 and the second plate 12 together can be loosened, but only to the extent that the first plate 11 and the second plate 12 can be displaced relative to each other in their contact plane. Any lifting of the first plate 11 and the second plate 12 should be avoided in the process. It is only important that they can be displaced relative to each other.

[0065] On the end faces of the first plate 11 and the second plate 12 corresponding screw connection devices 19 are arranged, which have a threaded seat 20 and a threaded bolt 21 which can be screwed into the interior thereof and which together form part of an adjustment device 22 .

[0066] A total of eight such screw connections 19 are arranged around the circumference of the first plate 11 and the second plate 12 , two on each side, which together form an adjustment device 22 .

[0067] In this process, the threaded supports 20 can be fastened to the first plate 11 and carry the threaded bolts 21, respectively. By rotating the threaded bolts 21, a force can be applied via the end faces of the threaded bolts 21 to the side faces of the second plate 12 to which they are applied, so that the second plate 12 is displaced with high precision (i.e. according to the rotation of the threaded bolts 21) relative to the first plate 11. The electric motor 3 fastened to the second plate 12 is displaced accordingly.

[0068] During this displacement, the position of the motor shaft 8 and therefore also the specimen axis 9 relative to the reference position of the first plate 11 can be measured again by means of a high-precision measuring device. When a state is reached in which the specimen axis 9 is exactly in the relative position to the first plate 11, in which no further deviations from the reference position (position, angle) defined by the first plate 11 can be detected, the fastening device 18 can be closed by tightening the connecting screws between the first plate 11 and the second plate 12, so that any displacement of the first plate 11 and the second plate 12 relative to each other is no longer possible.

[0069] In this case, the first plate 11, the second plate 12 together with the support frame 10 and the electric motor 3 form a compact, stable unit, in which the specimen axis 9 is exactly at a predetermined position in a predetermined position (reference position). When this compact unit is subsequently fastened to the mounting plate 7 of the test bench 1 via the first plate 11, the specimen axis 9 and the test bench axis 6 are precisely aligned with each other. In this way, parallel offsets or angular offsets can be practically eliminated.

[0070] For example, the pre-assembly and alignment of the electric motor 3 may be performed by the following steps, including:

[0071] The second plate 12 is arranged horizontally on top of the first plate 11 at a pre-assembly station (not shown).

[0072] - The test piece (electric motor 3) is placed on the second plate 12. In this case, the motor shaft 8 projects vertically downwards.

[0073] The position (location, orientation) of the motor shaft 8 and therefore also of the test bench axis 9 is measured by means of a high-precision 3D measuring device.

[0074] Alignment of the motor shaft 8 and thus of the specimen axis 9 by means of a horizontal or planar displacement of the second plate 12 on the first plate 11 .

[0075] The first plate 11 is fixed to the second plate 12 by means of fastening means 18 .

[0076] - Rotate the entire device (including the support frame 10 fastened to the second plate 12) by 90°.

[0077] - Positioning the spring elements 16 arranged on the support frame 10 on corresponding support rails of the test bench 1 and sliding the support frame 10 over the support rails, wherein the spring elements 16 are guided in corresponding grooves of the support rails.

[0078] - The supporting frame 10 is moved together with the first plate 11 and the second plate 12 until the first plate 11 is in contact with the mounting plate 7 of the test bench 1. Thereafter, the plates 11, 12 are connected to the mounting plate 7 by means of screw connections.

[0079] Suitable centering elements, for example at least two centering bolts, must be provided in order to position the first plate 11 exactly on the mounting plate 7 .

[0080] In the example shown, the centering is achieved by annular centering using a cylindrical shoulder 23 on the first plate 11. A corresponding hollow cylindrical recess (not shown) is provided in the mounting plate 7 in a cooperating manner with the shoulder 23.

Claims

1. A device (2) for aligning an axis (9) of a test piece (3) relative to an axis (6) of a test bench (1), the device comprising: - a first plate (11) configured to be fastened to a mounting plate (7) of the test bench (1); And include: - a second plate (12) configured to fasten said test piece (3); in - the first plate (11) and the second plate (12) are arranged in a planarly superimposed manner and are fastened by fastening means (18); - the fastening device (18) is capable of achieving at least two fastening states, namely an aligned state and a fixed state, so that the two plates (11, 12) can be displaced parallel to each other in the aligned state and the two plates (11, 12) are fixed relative to each other in the fixed state; and wherein - adjustment means (22) are provided for displacing one of the two plates (11, 12) in parallel relative to the other plate (11, 12) in the aligned state.

2. The device according to claim 1, wherein - the fastening device (18) has at least one screw connection acting between the first plate (11) and the second plate (12); and wherein The screw connection is securely tightened in the fixed state and is loosened in the aligned state such that the two plates (11, 12) can be displaced relative to each other.

3. Apparatus according to any one of the preceding claims, wherein the adjustment device (22) is configured to generate a force between the first plate (11) and the second plate (12) for relative displacement of the two plates (11, 12).

4. The device according to any one of the preceding claims, wherein - the adjusting device (22) has a plurality of screw connections (19); - at least one of the screw connection means (19) has a threaded seat (20) fastened to one of the two plates (11, 12); - a threaded bolt (21) can be threaded into the interior of the threaded support (20); and wherein One end face of the threaded bolt (21) acts on one of the two plates (11, 12) to which the threaded support (20) is not fastened, thereby being able to exert a force on the plate (11, 12) in question.

5. The device according to any one of the preceding claims, wherein - the threaded seat (20) and / or the screw bolt (21) that can be screwed into the interior of the threaded seat (20) are arranged on the side of the corresponding plate (11, 12); and wherein - said side surface is perpendicular to the contact surface where the two plates (11, 12) touch in a planar manner.

6. The device according to any one of the preceding claims, wherein - the geometric shapes of the first plate (11) and the second plate (12) both correspond to plate-shaped cuboids, each cuboid having two plate surfaces parallel to each other and four side surfaces connecting the two plate surfaces; and wherein The adjusting device (22) has eight screw connections (19), two of which are each arranged at a distance from one another on a side of the plate.

7. Apparatus according to any one of the preceding claims, wherein the test piece is an electric motor (3).

8. Apparatus according to any one of the preceding claims, wherein a supporting frame (10) is provided, which is fastened to the second plate (12).

9. Apparatus according to any one of the preceding claims, wherein support elements (17) are provided on the support frame (10) to support a specimen (3) fastened to the second plate (12).

10. A test bench system comprising: - an electric motor (3) which serves as a test piece; - a test bench (1) for testing the electric motor (3); - a test bench shaft (5) to which the shaft (8) of the electric motor (3) can be fastened for transmitting the movement of the electric motor (3) to the test bench (1); - a mounting plate (7) arranged on the test bench (1); and comprising: - A device (2) according to any one of the preceding claims as an alignment device for fastening the electric motor (3) to the mounting plate (7) and aligning it with the mounting plate (7).

11. A test bench system according to claim 10, wherein the first plate (11), the second plate (12), the electric motor (3) fastened to the second plate (12), and the supporting frame (10) constitute a preassembled unit, which can be fastened to the mounting plate (7) as a single unit.

12. Test bench system according to claim 10 or 11, wherein the first plate (11) of the unit can be fastened to the mounting plate (7).

13. The test bench system according to any one of claims 10 to 12, wherein a centering device (23) is provided for centering the first plate (11) relative to the mounting plate (7).

14. A method for aligning an axis (9) of a test piece (3) relative to an axis (6) of a test bench (1), comprising the following steps: - providing a first plate (11) and a second plate (12); - arranging the first plate (11) and the second plate (12) in such a way that their respective planar sides overlap; - fastening said test piece (3) to said second plate (12); - measuring the axis (9) of the test piece (3) and comparing the position of the axis (9) with a predetermined reference position relative to the first plate (11); - aligning the axis (9) of the specimen (3) relative to the first plate (11) by displacing the second plate (12) carrying the specimen (3) relative to the first plate (11) so as to minimize any deviation of the position of the axis (9) from the reference position; - fastening the first plate (11) and the second plate (12); - fastening a support frame (10) to the second plate (12) such that the first plate (11), the second plate (12), the specimen (3) and the support frame (10) form a unit; - Fastening the unit to a mounting plate (7) of the test bench (1).

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