Delamination tester for an airbag area in a passenger cabin of a motor vehicle

Abstract

Delamination tester (1) for an airbag area (2) in a passenger cabin (3) of a motor vehicle (4), comprising a tester body (5) for insertion into a detachment area (6) between a detached laminate (7) and an associated surface (8) to be coated with the laminate (7), wherein the tester body (5) comprises the following components: - for a measuring tip (9) of a measuring gauge (10) with a measuring scale (11), a receiving pocket (12); and - a contact tip (13) which is arranged opposite to the receiving pocket (12) at a defined distance (14), wherein the contact tip (13) has a measuring direction (15), a thickness direction (16), and a width direction (17), wherein in use the measuring direction (15) is aligned in the direction of the length (18) of a detachment path of the detachment region (6) of the laminate (7) to be examined, the thickness direction (16) is aligned parallel to the surface normal (19) of the surface (8) to be coated, and the width direction (17) is aligned transversely to the measuring direction (15) and to the thickness direction (16), and wherein the contact tip (13) is larger than a measuring tip (9) of a measuring gauge (10) which can be accommodated in the receiving pocket (12), and wherein a stop (20) defined in such a way is formed for a measuring tip (9) in the receiving pocket (12) that the measuring scale (11) of the measuring gauge (10) aligned along the measuring direction (15) can be read with reference to the contact tip (13).

Description

[0001] The invention relates to a delamination tester for an airbag area in a passenger cabin of a motor vehicle, as well as a manufacturing method with such a delamination tester for a delamination tester.

[0002] In airbag tests, reproducible opening must be ensured according to legal requirements. For manufacturing reasons, it occasionally happens that the laminate, for example leather, film, or similar, delaminates in the airbag area outside an airbag flap in the cockpit, and can potentially impede the deployment of the airbag. To measure this delamination, the resulting delamination area is currently measured using sharp-edged metal measuring gauges. The gauge is inserted between the laminate and the surface previously coated with the laminate. Due to the sharp edges of such a gauge or its measuring tip, further delamination may occur, which falsifies the measurement result.

[0003] The aim is to find a measuring tool that can generate reliable measured values ​​and reliably prevent the delamination from spreading.

[0004] DE 10 2004 006 661 A1 discloses an interior trim part for a vehicle, in particular for a motor vehicle, behind which, in the mounted state, at least one airbag is arranged, which, upon activation, can be inflated toward a vehicle interior through an airbag passage opening formed or capable of being formed in the interior trim part. To expose the airbag passage opening, at least one airbag cover formed or capable of being formed on the interior trim part can be lifted off. The interior trim part is constructed, at least in the cover region, in multiple layers from an at least single-layer carrier layer and at least one adhesive layer. The components of the carrier layer that detach and / or splinter off from the interior trim part during the cover removal process can be retained on the adhesive layer directly or indirectly bonded to the interior trim part by means of an adhesive bond.

[0005] DE 201 09 347 U1 discloses a wedge-shaped measuring device for determining gap dimensions between body parts of motor vehicles, wherein the size of the gap is determined from the penetration depth of the measuring wedge into the gap to be measured, the size of the gap is read off a scale attached to the top of the measuring wedge and the scale is calculated in such a way that the width of the gap can be read off the scale directly in millimetres or inches.

[0006] JP H08 - 178 609 A discloses a gap measuring device using a magnetic scale with digital display and mainly used for measuring axial and radial gap portions of a seal portion formed by a turbine wheel and a partition plate of a steam turbine in a power plant, a gap portion between a turbine blade and a cabin seal portion, and a gap portion that is difficult to measure with other calipers.

[0007] Furthermore, CN 2 08 805 127 U discloses a depth measuring tool composed of a main ruler and a caliper which can slide on the main ruler.

[0008] CN 2 18 628 030 U discloses a ruler body, wherein a number indicates the meters on the ruler body, a side groove formed on the upper side and the lower side of the ruler body, and a reading block connected to the side groove at a lock of the ruler body.

[0009] Based on this, the present invention is based on the object of at least partially overcoming the disadvantages known from the prior art. The features of the invention are derived from the independent claims, for which advantageous embodiments are presented in the dependent claims. The features of the claims can be combined in any technically reasonable manner, whereby the explanations from the following description as well as features from the figures, which comprise additional embodiments of the invention, can also be consulted for this purpose.

[0010] The invention relates to a delamination tester for an airbag area in a passenger cabin of a motor vehicle, comprising a tester body for insertion into a release area between a detached laminate and an associated surface to be coated with the laminate, the tester body comprises the following components: - for a measuring tip of a measuring gauge with a measuring scale, a receiving pocket; and - a contact tip which is arranged opposite to the receiving pocket at a defined distance, wherein the contact tip has a measuring direction, a thickness direction and a width direction, wherein in use the measuring direction is aligned in the direction of the length of a detachment path of the detachment area of ​​the laminate to be examined, the thickness direction is parallel to the surface normal of the surface to be coated and the width direction is transverse to the measuring direction and to the thickness direction, and wherein the contact tip is larger than a measuring tip of a measuring gauge that can be accommodated in the receiving pocket, and wherein a stop defined for a measuring tip is formed in the receiving pocket such that the measuring scale of the measuring gauge aligned along the measuring direction can be read with reference to the contact tip.

[0011] Unless explicitly stated otherwise, ordinal numbers used in the preceding and following descriptions serve only to clearly distinguish them and do not reflect the order or ranking of the designated components. An ordinal number greater than one does not necessarily imply that another such component must be present.

[0012] Within the passenger compartment (for example, the cockpit alone or the entire interior) of a motor vehicle, at least one, and usually a plurality of, airbags are arranged in a respective airbag area. For this purpose, it is common practice today to arrange one airbag in or behind the dashboard, within the steering wheel, and / or, for example, at least one side airbag in the A-pillar and / or B-pillar and / or in a passenger seat. These are intended to be integrated into the interior of the motor vehicle and (almost) invisibly hidden behind covered flaps or deformable tabs. The flap or tab, the connection area (possibly with a gap, predetermined breaking line, and / or joints), and their covering (the so-called outer material, made of, for example, fabric and / or leather) together form an airbag area, which is designed to ensure sufficiently minimal impairment of the airbag's expansion.In the airbag area, the outer material is applied as a laminate, i.e. in a material-to-material manner (usually glued).

[0013] An airbag is arranged beneath the airbag area, i.e. beneath a laminate. In the event of a crash, a passenger in the passenger compartment of the motor vehicle must be protected from excessive impact. Outside of a crash, an airbag is concealed by the laminate for design reasons. The surface represents the surface of a casing of a support structure, a support structure and / or a support layer. This is made of metal and / or plastic. This surface is therefore coated with the desired laminate during production. For example, the laminate is made of leather, artificial leather, plastic and / or a fabric (e.g. a woven fabric made of synthetic and / or natural fibers). In one embodiment, the laminate (also) comprises predetermined breaking points or joints for low-resistance deflection when an airbag is explosively deployed.

[0014] When an airbag is deployed, the laminate often detaches, at least partially, in the airbag area. This creates a detachment area in which the laminate is no longer firmly bonded to the (normally coated) surface (hereinafter referred to as the surface to be coated). For proper operation and thus for a tested approval of a system in an airbag area, the detachment area must be measured. Alternatively or additionally, delamination must be checked for during production of new materials, and the bond improved if necessary.

[0015] In order to measure this delamination area, a delamination tester is proposed here, which is designed to be inserted into the delamination area, i.e. between the laminate and the surface to be coated, in such a way that the delamination area is not enlarged solely as a result of the measurement.

[0016] A conventional measuring tip of a caliper is made of a hard material, often metal or a fiber composite, for high measurement accuracy, and is also designed with sharp corners and hard edges. When measuring the delamination area, such corners and edges are impractical because they can further deepen a delamination with even minimal hand force, thus enlarging the delamination area. A caliper is therefore unsuitable for measuring delamination. On the other hand, a caliper is a precise and easy-to-use tool, and is therefore often already available.

[0017] Here, an attachment for a measuring gauge is proposed. This attachment is referred to herein as a delamination tester and comprises or is formed by a tester body. The tester body has a receiving pocket for a measuring tip of a measuring gauge. Thus, the sharp-edged measuring tip of the measuring gauge is enclosed by the tester body (at least in the insertion direction, i.e., the measuring direction), thus preventing further delamination of the laminate in the delamination area.

[0018] In order to ensure that the spatial limitation of the detachment area is adhered to and thus also to a precise measurement of the detachment area, it is necessary to provide a defined reference surface, i.e. a tip. The tester body comprises a contact tip for this purpose. The contact tip represents one spatial end of the tester body and, when measuring the detachment area, is in direct contact with the base of the detachment, i.e. the boundary area where the laminate is still connected to the surface. The contact tip is arranged opposite the receiving pocket at a defined distance. A defined distance is calibrated to the measuring scale of the measuring gauge, for example in millimeters and / or inches, for example in such a way that (exactly) 10 mm [ten millimeters] (or another reasonable value) must be added to the current measured value according to the measuring scale of the measuring gauge.Due to this well-defined design of the distance, the spatial extent, i.e. the length in the measuring direction, of the detachment area can be precisely measured using the measuring gauge used.

[0019] In order to incorporate the predefined distance from the measuring tip into the measurement, it is proposed here that a stop be arranged on the measuring scale of the measuring gauge in the measuring direction. The stop ensures reproducible measurement using the measuring gauge, even when the delamination tester is placed on and then re-placed on the measuring gauge. In one embodiment, a play is provided within which the predefined distance can be adjusted to an easily readable or calculable value on the measuring scale. Alternatively, the stop is configured such that a simple attachment, for example, plugging or inserting, already results in a sufficiently precise relative arrangement of the contact tip to the measuring scale of the measuring gauge.

[0020] In addition, the contact tip is designed in such a way that it is sufficiently blunt that, when handled properly and taking into account average hand force or (due to retaining forces when sliding over the inside of the laminate and / or the surface to be coated) the hand force necessary for a reliable and practically feasible measurement, delamination does not continue, i.e. the detachment distance is not extended. For this purpose, the contact tip has a thickness (in the thickness direction, which is aligned parallel to the surface normal of the surface to be coated) and a width (in the width direction, which is aligned transversely to the length or measurement direction and the thickness direction) such that it is correspondingly blunt. In one embodiment, the material is soft and / or has strongly rounded edges and corners, so that delamination cannot continue (as easily).In one embodiment, the surface area of ​​the contact tip is large, so that insertion in the measuring direction causes a strong deflection of the laminate, thus preventing excessive insertion. In one embodiment, the material of the contact tip (or the entire tester body) is selected such that, starting at a certain gap height, the material of the contact tip is compressed and cannot be inserted further (or only with excessive force).

[0021] The contact tip is designed in such a way that it is always larger than the measuring tip of the gauge. The contact tip therefore always represents an enlargement of the geometric extent (compared to the measuring tip of the gauge or the receiving pocket for the measuring tip of the gauge). Due to the geometric enlargement, a cutting effect of the measuring tip and the associated further delamination of the detachment area is prevented, allowing more precise measurement results of the detachment area.

[0022] It is further proposed in an advantageous embodiment of the delamination tester that a supplementary scale is applied to the delamination tester along the measuring direction.

[0023] As previously described, the delamination tester forms an extension of the measuring tip of a gauge in the measuring direction. This extension is equipped with a supplementary scale on the delamination tester to increase the reliability of correct readings from the gauge's measuring scale and / or to enable correct installation on a gauge by a worker (due to the distance between the contact tip and the measuring tip). This supplementary scale is preferably configured so that its selected value (e.g., a fixed end value, e.g., 10 mm) is visible even outside of a delamination range during a regular delamination distance and / or is easy to remember, thus making it easy to add the delamination distance read during operation to the gauge's measuring scale.

[0024] In one embodiment, the supplementary scale is configured to adjust the defined distance. In one embodiment, the supplementary scale is referenced to the zero line, a measuring edge of the measuring tip, and / or a (reasonable) reference value of the measuring scale of the measuring gauge. In one embodiment, an additional length of the tester body, i.e., from the base of the receiving pocket to the contact tip, is selected such that, even with high manual force, the pressing of a sharp corner or edge of the measuring tip through the material of the delamination tester is reliably prevented.

[0025] It is further proposed in an advantageous embodiment of the delamination tester that the contact tip has a thickness in the thickness direction which is greater than the thickness of a measuring tip of a measuring gauge which can be accommodated in the receiving pocket, preferably twice as thick or more, preferably less than four times as thick.

[0026] To prevent damage to the laminate in the thickness direction, it is proposed that the thickness of the contact tip be greater than the thickness of the measuring tip of the gauge in the receiving pocket. This ensures that a potentially sharp-edged measuring tip does not damage the laminate or render it unusable for a possible recoating of the surface. The thickness is preferably selected so that it is between twice the thickness and four times the thickness of the measuring tip. This also ensures the usability of the delamination tester for measuring gauges or measuring tips of measuring gauges of different thicknesses.

[0027] As already mentioned above, the thickness is particularly preferably selected such that the laminate would have to be deflected so strongly in the area of ​​transition to a regular (i.e., unimpaired) material bond with the surface to be coated that a force from the bonded areas via the laminate prevents further (delaminating) insertion of the delamination tester. This makes it impossible to cut into the area between the laminate and the surface to be coated with minimal force.

[0028] It is further proposed in an advantageous embodiment of the delamination tester that the contact tip has a width in the width direction which is greater than the width of a measuring tip of a measuring gauge which can be accommodated in the receiving pocket, preferably twice as wide or more, preferably less than six times as wide.

[0029] As previously described, the contact tip is designed to always be larger than the measuring tip of the gauge. Specifically, it is proposed that the width of the contact tip, i.e., the spatial extension of the contact tip in the width direction, be larger than that of the measuring tip in the receiving pocket. For particularly narrow measuring tips (in the width direction), the larger width of the contact tip prevents the laminate from being punctured or scratched when measuring the detachment distance, with the same (counterforce) effect as previously explained with reference to the thickness of the contact tip.

[0030] In a preferred embodiment, the width of the contact tip is selected so that it is designed in a range between twice the width and a maximum of six times the width of the measuring tip. This allows detachment areas of varying sizes and widths to be measured using the contact tip of the tester body. In one embodiment, the laminate is attached to the surface to be coated with individual adhesive dots. A delamination tester that is too narrow would be able to be inserted between such adhesive dots. In one embodiment, narrow detachment areas are not relevant for reproducible airbag deployment. It is therefore advantageous to use a contact tip with a correspondingly defined width so that the (unsuccessful) insertion attempt immediately shows that this detachment area does not need to be measured. This eliminates the need for an additional step of measuring the width.In addition, measuring the width in a pocket formed by the delamination area is difficult. The delamination tester, with a contact tip of defined width, makes this possible easily and without further measurements (or transverse movement to the insertion direction or measurement direction), which also increases the risk of further delamination.

[0031] It is further proposed in an advantageous embodiment of the delamination tester that the contact tip has a flat contact front surface normal to the measuring direction and two side surfaces in the width direction to the left and right of the contact front surface, wherein a right angle is formed to the side angles and / or a radius of curvature of its transition corner between the contact front surface and the respective side surface is greater than 2 mm, preferably greater than 4 mm, and less than 10 mm, preferably less than 8 mm, wherein the contact front area measured from one of the side surfaces to the opposite side surface is preferably more than 15 mm, particularly preferably more than 20 mm, or preferably more than 30 mm, particularly preferably more than 40 mm, and preferably less than 80 mm.

[0032] Furthermore, it is proposed that the contact tip have a contact front surface that is flat in the center and perpendicular to the measuring direction. The contact front surface is bounded by two side surfaces in the width direction. The transition from the contact front surface to the side surfaces, which are not flat and oriented perpendicular to the measuring direction, is formed by a transition corner with a side angle, which can be designed in different ways.

[0033] In one embodiment, at least one, preferably both, of the side angles are designed as right angles, thus providing a clear lateral, widthwise boundary of the contact front surface by means of the transition corners. For example, using the right angles, in addition to the detachment distance in the measurement direction, the detachment distance in the width direction can also be measured. Alternatively, a different angle, for example 45° [forty-five degrees out of 360°], is provided, preferably followed by a further angle totaling 90° or more, so that the contact front surface has a narrow adjacent area up to a maximum overall width of the delamination tester, which is not flat.

[0034] In a preferred embodiment, at least one, preferably all, of the transition corners are provided with a rounding radius in the width direction (i.e., with the rotation axis parallel to the thickness direction), so that no sharp-edged corners are created. The rounding radius can be implemented with a constant radius or a variable radius, for example, with a tapered radius.

[0035] In one embodiment for a small embodiment, the respective side surfaces are spaced apart in the width direction by more than 15 mm [fifteen millimeters], particularly preferably more than 20 mm, and preferably less than 80 mm. In a large embodiment, this width of the contact front surface is in a range between 30 mm [thirty millimeters], particularly preferably between 40 mm and 80 mm.

[0036] The actual contact front surface, or the contact relevant for the measurement (i.e., the reference line), is narrower than the specified dimension between the side surfaces, provided a rounding radius is provided. With a rounding radius of 5 mm on both sides, the contact front surface is 5 mm (twice 2.5 mm) narrower in the width direction.

[0037] It is further proposed in an advantageous embodiment of the delamination tester that the receiving pocket is a clamping receptacle for a measuring tip of a measuring gauge to be received.

[0038] In one embodiment, the clamp holder is designed to be mechanically releasable, for example, with a foldable tab. This allows the measuring tip, which can be inserted into the holder pocket, to be releasably secured in the measuring direction, preventing accidental slippage of the measuring tip during operation, especially when removing the delamination tester. Alternatively or additionally, a flange for a positive connection is arranged on the measuring gauge, which, together with the corresponding tab, ensures fixation.

[0039] In a preferred embodiment, the clamping receptacle is designed such that the receiving pocket has a corresponding fit (i.e., at least partially undersized), and the measuring tip is releasably secured in the receiving pocket by means of a positive fit. For this purpose, the receiving pocket of the delamination tester is made of a significantly more elastic material than the measuring tip of the measuring gauge, so that the measuring tip can be clamped and / or clipped into the receiving pocket with a positive fit, thus creating a force fit and / or positive fit.

[0040] It is further proposed in an advantageous embodiment of the delamination tester that the material of the contact tip, preferably of the entire delamination tester, is softer than that of a measuring tip of a measuring gauge that can be accommodated in the receiving pocket, wherein the material is preferably a plastic, particularly preferably a foam.

[0041] To prevent a knife effect or additional delamination within the detachment area during operation, it is proposed that the contact tip and / or the entire delamination tester be made of a material that is softer than the measuring tip of the gauge. In one embodiment, the contact tip is made of a plastic, for example, polyamide or silicone, with the plastic preferably also being blunt by means of rounded radii and appropriate deburring.

[0042] In a preferred embodiment, the contact tip is made of a foam, for example of a foamed polypropylene or a foam on elastomeric plastic (porous elastomer).

[0043] In a preferred embodiment, the material is also softer than the laminate and thus damage to the laminate is excluded, at least with normal (e.g. necessary) manual force.

[0044] It is further proposed in an advantageous embodiment of the delamination tester that along the measuring direction opposite the contact tip, a stop surface for contact with a measuring surface of a sliding element of a measuring gauge with the measuring tip which can be accommodated in the receiving pocket, wherein the sliding element preferably has a vernier scale.

[0045] In one embodiment, the measuring gauge has a sliding element with a measuring surface, so that a distance between the measuring surface of the sliding element and the measuring tip can be read when the measuring surface is placed against a reference edge of an object to be measured. Using the stop surface of the tester body, which is arranged opposite the contact tip or the contact front surface in the measuring direction, this measuring surface can be used to adjust and / or set (preferably without adjustment) the defined distance between the measuring tip and the contact tip. The stop surface is designed for defined contact with the measuring surface of the sliding element.

[0046] The sliding element preferably has a vernier scale, wherein a vernier scale represents a movable length scale for increasing reading accuracy on measuring instruments, such as a caliper. Thus, the length of a separation distance can be read (e.g., with an accuracy of tenths of a millimeter) and / or the defined distance between the measuring tip or measuring scale and the contact tip can be adjusted.

[0047] According to a further aspect, a manufacturing method for a delamination tester is proposed, wherein a computer-readable file with selectable, changeable parameters is maintained, whereby the parameters define a respective delamination tester for a desired gauge and / or a desired width and / or length of a delamination area of ​​a laminate, and a respective delamination tester is produced according to the selected parameters using 3D printing, preferably without any post-processing on the contact tip, the receiving pocket and / or the stop surface according to an embodiment according to the above description.

[0048] Using the file generated in this manufacturing process for a delamination tester, for example, a three-dimensional model of the delamination tester is output. In one embodiment, the file can be modified by a person skilled in the art in such a way that a corresponding delamination tester is generated in a 3D model for specific parameters, for example, a specific model of a measuring gauge and / or the previously superficially and roughly measured or estimated width and length of the delamination area.

[0049] In one embodiment, all geometric parameters of the gauge or the receiving pocket that holds it are adjustable. For example, undercuts and fits of the receiving pocket are adjustable, as are the stop surface and the start of the supplementary scale, the precise geometric design of the contact front surface, and the transition corners with the rounding radii. This large number of adjustable parameters allows the operator to create the most precise design or adaptation of the delamination tester (or its 3D model).

[0050] The 3D model generated during the manufacturing process is designed within the file in such a way that it is computer-readable and contains all the necessary information (including standardized compression, if necessary) so that a corresponding delamination tester can be created using a 3D printer, i.e., a deposition process (primary forming). The advantage of such a 3D-printed model is that it can be manufactured on-site relatively quickly, cost-effectively, and individually (compared to manual labor), provided a 3D printer (which is now inexpensive and widely available) is available.

[0051] In a preferred embodiment, the file or the 3D printing process is designed in such a way that no post-processing is required for measuring the relevant areas of the delamination tester, at least on the contact front surface and / or receiving pocket or the stop surface. Particularly preferably, the 3D-printed product (delamination tester) is configured to measure the delamination area directly after printing and can be mounted on the measuring gauge immediately after completion of the 3D printing process, for example, by clamping it with the appropriate undersize.

[0052] It should be noted that the 3D model forms a limited parameter space. The corresponding distances, or the stop surface and the receiving pocket, for the selected gauge model are already set in the correct ratio or are fixed. Furthermore, the width and length of the contact front surface can be determined using a first surface dimension of the detachment area and can be changed during the manufacturing process. A further pre-selection allows a contact front surface to be formed based on the surface dimension in such a way that, as described above, the detachment area cannot be enlarged or the laminate cannot be further delaminated. Furthermore, the manufacturing process pre-selects predetermined curvature radii that match the width and length, or certain nonsensical combinations of parameters are excluded or cannot be selected.

[0053] It is further proposed in an advantageous embodiment of the manufacturing method that at least one, preferably all, of the parameters for producing a desired delamination tester are set by means of a selectable preselection of different measuring gauges and / or widths.

[0054] In a preferred embodiment, the variable parameters are at least partially predetermined in a preselection, or their values ​​are roughly predetermined. For example, different models of measuring gauges and their sliding elements are stored with names and / or images. For example, the input options for adjusting the parameters are made accessible to the user of the manufacturing process in a GUI (graphical user interface), so that the user can, for example, select a value from a drop-down menu, select a variant by checking the box, and / or click on the corresponding image. The manufacturing process then generates an (adjusted) 3D model using the corresponding background data for the sliding element of the measuring gauge.

[0055] Fundamentally, the proposed approach is to simplify the selection of the parameters described above using the manufacturing process, and to create a faster design of the delamination tester or its 3D model on the file for subsequent 3D printing. This allows a delamination tester to be produced using 3D printing with minimal time and high reliability.

[0056] The invention described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, whereby it should be noted that the drawings are not to scale and are not suitable for defining proportions. It is shown in Fig. 1: a gauge with two delamination testers; Fig. 2: a section of a delamination tester with supplementary scale; Fig. 3: a ready-to-use delamination tester with a stop surface for a measuring surface of a gauge; Fig. 4: a delamination tester inserted into a delamination area using a gauge; and Fig. 5: a motor vehicle with passenger compartment and airbag areas.

[0057] In Fig. 1 shows a gauge 10 with two delamination testers 1. A large version (i.e., with a large width 23) is attached with its receiving pocket 12 to the measuring tip 9 of the gauge 10, and a smaller (i.e., narrower) alternative version is shown lying next to it for size comparison. On the left side of the illustration, a coordinate system is shown in which the measuring direction 15 is oriented horizontally and to the right in the plane of the page, the width direction 17 is oriented vertically upward in the plane of the page, and the thickness direction 16 is oriented out of the plane of the page.

[0058] The measuring gauge 10 has a central rail with a measuring scale 11 relating to a measuring tip 9 (on the right in the illustration). A sliding element 31, here with a vernier scale 32, is provided on this rail, which has a wide measuring surface 30. The tester body 5 of the (wider) delamination tester 1 is clamped force-fittingly onto the measuring tip 9 by means of its receiving pocket 12. In one embodiment, a stop 20 for the measuring tip 9 of the measuring gauge 10 is already formed here (compare the small, lower embodiment). A defined distance 14, for example, exactly 10 mm, is set between the zero mark of the measuring scale 11 and the contact tip 13 of the tester body 5, or can be adjusted via the (purely optional) stop surface 29 together with the measuring surface 30 of the measuring gauge 10 (compare Fig. 3).

[0059] The contact tip 13 has a flat contact front surface 24, which transitions into the respective side surface 25 (here purely optionally aligned at a right angle) via a transition corner 28 with a side angle 26. Both the transition corners 28 are designed with a rounding radius 27, here purely optionally approximately 5 mm. The side angle 26 and the rounding radius 27 are shown here as examples on the smaller embodiment.

[0060] In Fig. 2 shows a section of a delamination tester 1 with supplementary scale 21. The tester body 5 shown is, for example, as in Fig. 1 (larger embodiment), but for example made of a different material (e.g. foam or silicone). In the receiving pocket 12 of the delamination tester 1, a coordinate system is shown in the illustration, in which the measuring direction 15 is oriented vertically upwards in the plane of the sheet, the width direction 17 is oriented horizontally and to the left in the plane of the sheet, and the thickness direction 16 is oriented out of the plane of the sheet. For an explanation of the details, please refer to the previous description. Fig. 1. Here, a supplementary scale 21 is clearly visible, with a defined distance 14 from the contact tip 13 (purely optional) of 10 mm relative to the zero mark of the measuring scale 11 of the measuring gauge 10, as in Fig. 1 is used.

[0061] In Fig. 3 shows a three-dimensional representation of a ready-to-use delamination tester 1 with a stop surface 29 for a measuring surface 30 of a measuring gauge 10, wherein the measuring tip 9 of the measuring gauge 10 is accommodated in the receiving pocket 12 of the tester body 5 and the stop surface 29 is brought into contact with the measuring surface 30 of the measuring gauge 10. The delamination tester 1 and also the measuring gauge 10 are, for example, as shown in Fig. 1 and Fig. 2 and in this respect, reference is made to the preceding associated description for an explanation of details. On the back (relative to the measuring scale 11) of the measuring gauge 10, a coordinate system is shown in the illustration, in which the measuring direction 15 points to the left-front, the width direction 17 points to the right-front, and the thickness direction 16 is aligned approximately in the plane of the page and points upwards. Here, it can be seen that the tester body 5 has a thickness 22 which is greater than that of the rail (here approximately three times greater) with the measuring tip 9. In the case of the stop surface 29, such a thickness 22 is useful for a tilt-free, stable contact with the measuring surface 30 of the measuring gauge 10. In the case of the contact front surface 24, such a thickness 22 is advantageous for preventing undesired deepening of the detachment path, as explained above.

[0062] In Fig. 4 shows a delamination tester 1 introduced into a detachment area 6 by means of a measuring gauge 10, for example as in Fig. 3. For further details, please refer to the previous description. On the (front) side with the measuring scale 11 of the measuring gauge 10, a coordinate system is shown in the illustration, in which the measuring direction 15 points to the left-back, the width direction 17 points to the left-down, and the thickness direction 16 is oriented out of the plane of the page and to the left-up.

[0063] Here it can be seen that the laminate 7 has lifted off along the surface normal 19 on the surface 8 to be coated, i.e. a delaminated detachment area 6 has formed as a pocket. The detachment area 6 has a length 18 in the measuring direction 15, which is drawn here from an edge of the window for the airbag (not shown here) to a kink visible from the outside on the outer fabric (laminate 7). This length 18 can be measured easily and reliably with the help of the delamination tester 1 using a measuring gauge 10. In one embodiment, the said kink in the outer fabric is caused by the contact front surface 24 or its thickness 22 when inserted along the measuring direction 15, whereby the worker receives haptic and visual feedback and does not insert the measuring gauge 10 any further.Preferably, the forces are so large that a significant jump in the necessary force is required to insert beyond the shown position (and thus undesirable delamination).

[0064] In Fig. Figure 5 shows a schematic plan view of a motor vehicle 4 with a passenger cabin 3 and purely optional airbag areas 2, which are provided with reference symbols by way of example. These designated airbag areas 2 in the passenger cabin 3 are designated in the steering wheel 33 in front of the driver's seat 36, at the passenger glove compartment 34 and pars-pro-toto at the passenger seat 37, in the A-pillar 35, on the outside of the passenger seat 37, and in the center console 38. The airbag areas 2 or airbags are arranged symmetrically in the passenger cabin 3 or adapted to the respective situation. Airbags may also be arranged for passengers on a rear seat, in the ceiling area, in the footwell, and / or in the seat belt.

[0065] The delamination tester proposed here enables reliable measurement of delamination in an airbag area. List of reference symbols 1 delamination tester 2 Airbag area 3 Passenger cabin 4 Motor vehicle 5 tester bodies 6 Detachment area 7 Laminat 8 Surface to be coated 9 Measuring tip 10 Gauge 11 Measuring scale 12 Recording pocket 13 Contact tip 14 defined distance 15 Measuring direction 16 Thickness direction 17 Latitude direction 18 length 19 Surface normals 20 stops 21 Supplementary scale 22 thickness 23 width 24 Contact front surface 25 side surface 26 side angles 27 Rounding radius 28 Transition corner 29 Stop surface 30 measuring area 31 Sliding element 32 Vernier scale 33 Steering wheel 34 Passenger glove compartment 35 A-pillar 36 Driver's seat 37 Passenger seat 38 Center console

Claims

[1] Delamination tester (1) for an airbag area (2) in a passenger cabin (3) of a motor vehicle (4), comprising a tester body (5) for insertion into a detachment area (6) between a detached laminate (7) and an associated surface (8) to be coated with the laminate (7), wherein the tester body (5) comprises the following components: - for a measuring tip (9) of a measuring gauge (10) with a measuring scale (11), a receiving pocket (12); and - a contact tip (13) which is arranged opposite to the receiving pocket (12) at a defined distance (14), wherein the contact tip (13) has a measuring direction (15), a thickness direction (16), and a width direction (17), wherein in use the measuring direction (15) is aligned in the direction of the length (18) of a detachment path of the detachment region (6) of the laminate (7) to be examined, the thickness direction (16) is aligned parallel to the surface normal (19) of the surface (8) to be coated, and the width direction (17) is aligned transversely to the measuring direction (15) and to the thickness direction (16), and wherein the contact tip (13) is larger than a measuring tip (9) of a measuring gauge (10) which can be accommodated in the receiving pocket (12), and wherein a stop (20) defined in such a way is formed for a measuring tip (9) in the receiving pocket (12) that the measuring scale (11) of the measuring gauge (10) aligned along the measuring direction (15) can be read with reference to the contact tip (13). [2] Delamination tester (1) according to claim 1, wherein a supplementary scale (21) is applied to the delamination tester (1) along the measuring direction (15). [3] Delamination tester (1) according to claim 1 or claim 2, wherein the contact tip (13) has a thickness (22) in the thickness direction (16) which is greater than the thickness (22) of a measuring tip (9) of a measuring gauge (10) which can be received in the receiving pocket (12). [4] Delamination tester (1) according to one of the preceding claims, wherein the contact tip (13) has a width (23) in the width direction (17) which is greater than the width (23) of a measuring tip (9) of a measuring gauge (10) which can be received in the receiving pocket (12). [5] Delamination tester (1) according to one of the preceding claims, wherein the contact tip (13) has a flat contact front surface (24) normal to the measuring direction (15) and two side surfaces (25) in the width direction (17) to the left and right of the contact front surface (24), wherein a right angle is formed to the side angles (26) and / or a rounding radius (27) of its transition corner (28) between the contact front surface (24) and the respective side surface (25) is greater than 2 mm. [6] Delamination tester (1) according to one of the preceding claims, wherein the receiving pocket (12) is designed as a clamping receptacle for a measuring tip (9) of a measuring gauge (10) to be received. [7] Delamination tester (1) according to one of the preceding claims, wherein the material of the contact tip (13) is softer than that of a measuring tip (9) of a measuring gauge (10) which can be accommodated in the receiving pocket (12). [8] Delamination tester (1) according to one of the preceding claims, wherein along the measuring direction (15) opposite the contact tip (13) there is a stop surface (29) for contact with a measuring surface (30) of a sliding element (31) of a measuring gauge (10) with the measuring tip (9) which can be received in the receiving pocket (12). [9] Manufacturing method for a delamination tester (1) according to one of the preceding claims, wherein a computer-readable file with selectable, changeable parameters is maintained, wherein by means of the parameters a respective delamination tester (1) is defined for a desired measuring gauge (10) and / or a desired width (23) and / or length (18) of a detachment area (6) of a laminate (7), and a respective delamination tester (1) is produced according to the selected parameters by means of 3D printing. [10] Manufacturing method according to claim 9, wherein at least one of the parameters for producing a desired delamination tester (1) is set by means of a selectable preselection of different measuring gauges (10) and / or widths (23).

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