DEVICE FOR POSITIONING THE POINT OF IMPACT ON A SPECIMEN DURING STATIC FIRING TESTS

Abstract

A system (1) for adjusting the point of impact (2) of a projectile on a specimen (3), comprising a bench (4) having a support (6) and a wall (7) erected vertically from said support (6), and a device for positioning the point of impact (5) positioned on said wall (7) of the bench (4). The system (1) includes means for adjusting the position of the point of impact (2) on the specimen (3) along three orthogonal directions (X, Y, Z), and the device for positioning the point of impact (5) includes means for adjusting the angle of incidence of the point of impact (2) on the specimen (3). Figure for the abstract: Fig 1

Description

Title of the invention: DEVICE FOR POSITIONING THE POINT OF IMPACT ON A SPECIMEN DURING STATIC FIRING TESTS technical field

[0001] The present invention relates to the field of static firing tests of projectiles on a specimen and particularly the positioning of the point of impact of a projectile on a specimen during static firing tests.

[0002] The invention relates in particular to the impact resistance test of aeronautical parts.

[0003] Static projectile firing tests on a specimen are very important, particularly for testing the specimen's impact resistance. To simulate bird collisions, gelatin projectiles are fired at aeronautical parts. This allows testing the impact on a specimen and anticipating potential improvements to the part design.

[0004] Today, there are systems comprising launching means configured to project projectiles into a particular area of ​​a machine. Document FR3120440A1 is known to describe a test bench comprising a firing means and a method for tracking debris.

[0005] However, the firing guns used during static firing tests are sometimes fixed relative to the target or are difficult to move. The objective is therefore to adjust the target's impact position directly.

[0006] Existing setups have revealed several problems. First, the sizes and profiles of the parts being tested are increasingly complex, making adjustments to the firing position on the parts tedious and imprecise, particularly adjustments to the height and angle of incidence. Second, a machine tool dividing head is often used for static firing tests, which is poorly suited for high-energy firing. Finally, the position used for one specimen is not easily repeatable on the same specimen, and transferring the setup to another specimen is impossible. Description of the invention

[0007] The present invention aims to overcome these drawbacks by improving the accuracy and ease of adjusting the points of impact of shots on the parts.

[0008] The invention therefore relates to a system for adjusting the point of impact of a projectile on a specimen, comprising a bench having a support and a wall erected vertically from said support, and a device for positioning the point impact point positioned on said bench wall. Said system includes means for adjusting the position of the impact point on the specimen in three orthogonal directions (longitudinal, vertical and transverse) and said impact point positioning device includes means for adjusting the angle of incidence of the impact point on the specimen.

[0009] Advantageously, the means for adjusting the position of the point of impact along the vertical direction include vertical grooves extending over the entire height of the wall, and means for fixing the device for positioning the point of impact on the wall.

[0010] Optionally, the bench wall includes a screw jack positioned under the impact point positioning device, allowing precise adjustment of the impact point on the specimen in the vertical direction.

[0011] According to one embodiment, the means for adjusting the position of the point of impact along the transverse direction include transverse grooves extending along the entire length of the support, and means for fixing the wall to the support.

[0012] Advantageously, the grooves in the wall and the support of the bench also allow the position of the point of impact on the specimen to be adjusted in a longitudinal direction.

[0013] The means for adjusting the angle of incidence of the point of impact include graduations for visualizing the value of the angle of incidence, a rotational restraint system for the positioning device of the point of impact and a digital inclinometer for precisely measuring the angle of incidence of the point of impact on the specimen.

[0014] Advantageously, the means for adjusting the angle of incidence of the specimen include a support piece made by stereolithography and conforming to the shape of the specimen.

[0015] According to one embodiment, the impact point positioning device includes another screw jack allowing precise adjustment of the height of the impact point on the specimen.

[0016] Optionally, the system for adjusting an impact point includes a laser beam representing the point of impact of the projectile on the specimen. Brief description of the drawings

[0017] Other objects, features and advantages of the invention will become apparent from the following description, given solely by way of non-limiting example and made with reference to the accompanying drawings in which:

[0018] - Fig. 1 is a schematic view of an impact point adjustment system of a projectile on a specimen;

[0019] - Figure [Fig. 2] is a schematic view of the adjustment of the position of the point of impact on a specimen along three orthogonal directions;

[0020] - Figure [Fig. 3] is a schematic side-sectional view of a device for putting into position of the specimen in the motor conditions of the overall device for positioning the point of impact of a system for adjusting the point of impact of a projectile on a specimen;

[0021] - Figure 4 is a schematic view representing the definition of the angle of incidence from the point of impact on a tested specimen;

[0022] - Fig. 5A is a schematic view of the means for coarsely adjusting the angle incidence of the point of impact on the specimen;

[0023] - Fig. 5B is a schematic view of the means for coarsely adjusting the angle incidence of the point of impact on the specimen;

[0024] - Figure 6 is a schematic view of a positioning tool for a means of adjusting the angle of incidence on a tested specimen; and

[0025] - Figure 7 is a schematic view of the means for finely adjusting the angle incidence of the point of impact on a specimen using a pressure screw of the screw jack. Detailed description

[0026] A system for adjusting 1 the point of impact 2 of a projectile on a specimen 3 is shown in [Fig. 1]. The system for adjusting 1 the point of impact 2 makes it possible to aim, for example with a cannon, as precisely as possible, at a well-defined point on a specimen 3 to be tested.

[0027] Such a system is advantageously used to test the impact resistance of aeronautical parts. These can be, for example, air intake blades.

[0028] This system includes a bench 4, an impact point positioning device 5 and means for adjusting the position of the impact point along three orthogonal directions, vertical Y, transverse Z and longitudinal X.

[0029] The bench 4 serves as the base for the entire system 1 and includes a support 6 and a wall 7 erected vertically from the support 6.

[0030] The impact point positioning device 5 is positioned on said wall 7 of the bench 4 and includes means for adjusting 8 the angle of incidence a of the impact point 2 on the specimen 3 to be tested.

[0031] As illustrated in [Fig.2], the means for adjusting the position of the impact point 2 along the vertical direction Y include vertical grooves 9 extending over the entire height of the wall 7, and means for fixing 10 of the positioning device of the impact point 5 on the wall 7.

[0032] The means of fixing 10 of the device for positioning the point of impact 5 on the wall 7 can be, for example, bolts, positioned over the entire surface of the device 5 in contact with the wall 7.

[0033] Optionally, the means for adjusting the position of the impact point along the vertical direction Y also include a screw jack 11 positioned under the impact point positioning device 5, allowing the position of the impact point 2 on the specimen 3 to be adjusted as precisely as possible along the vertical direction Y.

[0034] The position of the impact point positioning device 5 is thus adjusted in height.

[0035] As illustrated in [Fig.2], the means for adjusting the position of the point of impact 2 along the transverse direction Z comprise transverse grooves 12 extending over the entire length of the support 6, and means for fixing 13 of the wall 7 on the support 6. The wall 7 can thus slide in the transverse grooves 12 of the support 6.

[0036] The means of fixing the wall 7 to the support 6 may be, for example, bolts, positioned over the entire surface of the wall 7 in contact with the support 6. The wall 7 may also include a bracket 14 or other assistance helping it to be held on the support 6.

[0037] The vertical grooves 9 and transverse grooves 12 are also means of adjusting the position of the impact point 2 on the specimen 3 along the longitudinal direction X. Indeed, the wall 7 can be placed at different positions on the width of the support 6, and the impact point positioning device 5 can be placed at different positions on the width of the wall 7. This allows the specimen 3 and the impact point 2 to move in space along the longitudinal direction X.

[0038] These adjustment means allow the position of the point of impact 2 on the specimen 3 to be adjusted according to three degrees of freedom X, Y, Z.

[0039] Fig. 3 represents a side section view of the impact point positioning device 5. It comprises a fixed plate 15 stable on the wall 7, an angular plate 16 capable of rotational movement and positioned on the fixed plate 15, and a support block 17, directly fixed to the center of the angular plate 16. The support block 17 follows the rotational movements of the angular plate 16.

[0040] Optionally, the impact point positioning device 5 also includes means reproducing the centrifugal force experienced by the specimen 3, for example, a thrust wedge 18 controlled by a thrust screw 19.

[0041] As illustrated in [Fig.4], the angle of incidence a is defined by the angle formed between the chord 20 of the profile of specimen part 3 and the axis 21 of the barrel.

[0042] In order to facilitate the adjustment of the positioning of the point of impact 2 on the specimen 3, and according to one embodiment, the gun projects a laser beam 22 onto the location at test, as shown in [Fig. 1].

[0043] In Figures 5A and 5B, the means for adjusting the angle of incidence 8 shown allow for a coarse adjustment of the angle of incidence α of the point of impact 2 on the specimen 3. The means for adjusting the angle of incidence α include angular graduations 23, present on the angular plate 16, allowing visualization of the value of the angle of incidence α selected during the adjustments of the positioning of the point of impact 2. They also include a system for manually rotating the positioning device of the point of impact 5 relative to the fixed plate 15.

[0044] This rotation system is illustrated in Figures 5A and 5B and comprises, for example, a bar 29 which fits into a hole 24 provided for this purpose in the impact point positioning device 5, and which allows the operator to manually engage the rotation of the impact point positioning device 5. In one embodiment, the hole 24 is located in the support block 17.

[0045] Fig. 7 illustrates the means for adjusting the angle of incidence 8 which allow fine adjustment of the angle of incidence of the point of impact 2 on the specimen 3. They include a digital inclinometer 27 allowing precise measurement of the angle of incidence of the point of impact on the specimen 3, and a screw jack 28 allowing precise adjustment of the height of the point of impact 2 on the specimen 3.

[0046] The positioning means for the digital inclinometer 27 is partially shown in [Fig. 6]. It comprises a support piece 25, for example made by stereolithography, which conforms to the shape of the specimen 3 to be tested and which is held in position by means of centering feet 26 conforming to the edges of the specimen 3.

[0047] The digital inclinometer 27 is, for example, mounted on the support part 25, at the based on specimen 3, allowing for precise results according to the rotations of specimen 3. The screw jack 28 is, for example, located on the contour of the angular plate 16.

[0048] The adjustment of the angle of incidence a of the point of impact 2 can thus achieve an accuracy of 0.05°.

[0049] These different means of adjusting the position of the point of impact according to the orthogonal directions X, Y and Z and according to the angle of incidence a allow the specimen to have the most degrees of freedom possible and thus to facilitate and specify the adjustment of the position of the point of impact 2 on the specimen 3.

[0050] This system is compatible with high-energy firing tests capable of projecting projectiles up to 4 kg, and is compatible with specimens having large sizes and complex geometry profiles, for example 3D aero profiles.

[0051] Furthermore, the system has good repeatability on the general position of the tested specimen and it is possible, during the tests, to make adjustments without having to completely reassemble the system.

[0052] Finally, the use of the same assembly for different parts is possible and can prove useful in certain situations.

Claims

Demands

1. System for adjusting (1) an impact point (2) of a projectile on a specimen (3), comprising a bench (4) having a support (6) and a wall (7) erected vertically from said support (6), and a device for positioning the impact point (5) positioned on said wall (7) of the bench (4), characterized in that it comprises means for adjusting the position of the impact point (2) on the specimen (3) in three orthogonal directions (X, Y, Z) and in that the device for positioning the impact point (5) comprises means for adjusting (8) the angle of incidence (a) of the impact point (2) on the specimen (3).

2. Adjustment system (1) of an impact point (2) according to claim 1, wherein the means for adjusting the position of the impact point (2) along the vertical direction (Y) comprise vertical grooves (9) extending over the entire height of the wall (7), and means for fixing (10) the positioning device of the impact point (5) on the wall (7).

3. Adjustment system (1) of an impact point (2) according to any one of claims 1 and 2, wherein the wall (7) of the bench (4) includes a screw jack (11) positioned under the impact point positioning device (5), allowing precise adjustment of the impact point (2) on the specimen (3) along the vertical direction (Y).

4. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 3, wherein the means for adjusting the position of the impact point (2) along the transverse direction (Z) comprise transverse grooves (12) extending over the entire length of the support (6), and means for fixing (13) the wall (7) to the support (6).

5. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 4, wherein the grooves (9, 12) of the wall (7) and of the support (6) of the bench (4) also allow adjustment of the position of the impact point (2) on the specimen (3) along a longitudinal direction (X).

6. Adjustment system (1) for an impact point (2) according to any one of claims 1 to 5, wherein the means for adjusting the angle of incidence (a) of the impact point (2) comprise graduations (23) for visualizing the value of the angle of incidence (a), a rotational retention system for the impact point positioning device (5), and a digital inclinometer (27) allowing precise measurement of the angle of incidence (a) of the point of impact (2) on the specimen (3).

7. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 6, wherein the adjustment means (8) of the angle of incidence (a) of the specimen (3) comprise a support piece (25) produced by stereolithography and conforming to the shape of the specimen (3).

8. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 7, wherein the positioning device of the impact point (5) includes another screw jack (28) allowing precise adjustment of the height of the impact point (2) on the specimen (3).

9. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 8, comprising a laser beam (22) representing the impact point (2) of the projectile on the specimen (3).

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