Three-face vibration test fixture

Abstract

To make a vibration test fixture more robust, without using heavier materials which leads to complex problems such as affecting the vibration endurance tester and also increasing costs.SOLUTION: To achieve this object, the present invention provides a three-face vibration test fixture that is lightweight, highly rigid, and adaptable to high-frequency vibration endurance tests, and that can be manufactured at low cost.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a vibration test jig used in a vibration endurance test. [Background technology]

[0002] The vibration test jigs used in general vibration endurance tests are redesigned each time the shape of the test object changes. Therefore, there are as many dedicated vibration test jigs as there are shapes of test objects. The size and shape of automobile parts often change with each model change, and the vibration test jigs used in vibration endurance tests are often redesigned each time. This makes the cost of vibration endurance tests expensive.

[0003] For example, commercially available vibration test jigs include the highly rigid vibration test jig shown in Figure 12, which is made from an aluminum block to accommodate vibration endurance tests of various sizes and weights. However, the high rigidity of the jig tends to make the jig itself heavy. This places a heavy burden on the vibration endurance test vibrator, and the vibrator's performance may not be fully utilized. Furthermore, the jig itself uses a lot of material and is made using cutting processes, making it expensive and not easily adopted.

[0004] One disclosed technique related to vibration test jigs that solves the above-mentioned problems is the invention proposed by the present applicants. Patent Document 1 describes a unit-type vibration test jig that combines various jigs to support large test parts, such as those shown in the example of Figure 8 of the Unexamined Patent Publication corresponding to a vibration endurance test of a bumper of a large vehicle and the example of a vibration test jig shown in Figure 11 of the Unexamined Patent Publication corresponding to a vibration endurance test of an exhaust pipe of a large vehicle. This invention aims to reduce the cost of vibration endurance tests by prefabricating unit-type vibration test jigs of several sizes and combining them to test parts of different shapes. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7097556 (Patent Gazette) Summary of the Invention [Problem to be solved by the invention]

[0006] Flexible modular vibration test jigs are widely used for various shapes of automobile parts, etc., due to their flexible combinations. However, even if they are flexible enough to maximize versatility, pursuing robustness necessitates high rigidity. This inevitably increases weight, placing a heavy load on the vibration exciter used in vibration endurance tests, and resulting in tests where performance is not fully realized. Therefore, despite the advances made over the past, complex problems arise, such as improving the vibrator or thickening the material of the jig itself to make it more robust, resulting in increased costs. To solve these problems, the present invention provides a three-sided vibration test jig that combines lightweight and high rigidity, is suitable for high-frequency vibration endurance tests, and is low-cost. [Means for solving the problem]

[0007] In the means 1 for achieving the above-mentioned object, The plate has a plurality of mounting holes in the thickness direction and at least three end faces perpendicular to the plane of the plate. An attachment reference board is used, which has a shape in which two of the end faces are formed so as to intersect at right angles. For example, the attachment reference board can be square or triangular. The mounting holes are drilled so that the plate can be fixed to the plane of the vibration exciter with a plurality of screws. A first side plate is provided that is integrated with or joined to a plate-like end portion of the mounting reference board, the end portion having a length along one of the orthogonal edges. For example, the first side plate is provided in a plate-like shape that is fixed with screws at multiple points and is placed upright. A plate-like second side plate is provided that is orthogonal to the first side plate and orthogonal to the mounting reference board, and is either integrated with the first side plate or joined and fixed to the mounting reference board at their respective contact surfaces, for example, by screws at multiple locations, and can have mounting holes provided as needed on a flat surface that is placed vertically. In other words, a three-sided vibration test fixture is constructed from these three orthogonal boards.

[0008] As described above, the plate-shaped mounting reference substrate, the plate-shaped first side panel, and the plate-shaped second side panel are firmly fixed so that they are perpendicular to each other, so that the plate-shaped portions act to reinforce each other against vibrations in the X, Y, and Z directions, as well as vibrations that combine these directions, thereby functionally forming high rigidity and acting to increase the resonance frequency, thereby achieving the object of the present invention. In addition, it can be constructed using only three plates, which makes assembly easy and also simplifies the drilling of holes for installation, making it easy to keep costs down. Even if it has a three-dimensional shape, it can be processed and assembled using plates, so no matter how complex the design specifications, it can be processed and assembled relatively easily.

[0009] Furthermore, which of the three surfaces to use and how can be determined for each test piece can be determined, providing a high degree of flexibility and convenience. By pre-arranging mounting holes in the plate-shaped mounting reference board, the plate-shaped first side panel, and the plate-shaped second side panel, respectively, weight can be reduced, enabling immediate adaptation to various vibration endurance tests. Cutting off portions not required for mounting, i.e., providing cutouts on the open end, can form cutout surfaces to prevent unnecessary vibration during vibration. Alternatively, providing openings as cutouts at the orthogonal intersections of the mounting reference board, the first side panel, and the second side panel can reduce weight, increase resonant frequency, and enable high-intensity vibration. [Effects of the Invention]

[0010] The present invention can provide a vibration test jig that is lightweight and robust, can be made compact, is suitable for vibration endurance tests at high vibration frequencies that do not place much strain on the vibration device, and can be made low cost, thereby achieving the objectives.

[0011] (Other means to solve the problem) It is possible to provide the vibration test fixture according to the above-mentioned means 1, in which the open end side of the first side panel and the open end side of the second side panel each have a cut-off surface.

[0012] It is possible to provide a vibration test jig as described in claim 1, which has an opening cut out at the corner where the mounting reference substrate, the first side panel, and the second side panel intersect, thereby making it possible to reduce weight.

[0013] It is possible to provide a vibration test jig as described in the above-mentioned means 2, in which the cut-off surfaces on the open end side of the first side panel and the open end side of the second side panel are each arc-shaped. This makes it possible to reflect the analysis results of topology optimization, etc. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a three-sided vibration test jig according to a first embodiment of the present invention, viewed from diagonally above on the right. [Figure 2] FIG. 2 is a perspective view of the mounting reference board of the three-sided vibration test fixture according to the first embodiment of the present invention, viewed from diagonally above on the right. [Figure 3] FIG. 3 is a perspective view of the first side plate of the three-sided vibration test fixture of the first embodiment according to the present invention, viewed from diagonally above on the right. [Figure 4] FIG. 4 is a perspective view of the second side plate of the three-sided vibration test fixture of the first embodiment according to the present invention, viewed from diagonally above on the left. [Figure 5] FIG. 5 is a perspective view of a three-sided vibration test jig according to a second embodiment of the present invention, viewed from above at an angle to the right. [Figure 6]FIG. 6 is a perspective view of a three-sided vibration test jig according to a third embodiment of the present invention, viewed from diagonally above on the right. [Figure 7] FIG. 7 is a diagram illustrating the mounting state when a double L-shaped bent pipe test specimen is actually subjected to a vibration endurance test using the three-sided vibration test jig described in Example 3 of the present invention. [Figure 8] FIG. 8 is a diagram illustrating an attachment state when two vibration test jigs described in the third embodiment of the present invention are used to actually perform a vibration endurance test on a crank-shaped pipe test specimen. [Figure 9] FIG. 9 is a diagram illustrating the installation state when a vibration endurance test is performed on a test specimen, which is a double L-shaped bent pipe, in the first position using the three-sided vibration test jig described in Example 2 of the present invention. [Figure 10] FIG. 10 is a diagram illustrating the installation state when a vibration endurance test is performed on a double L-shaped bent pipe test specimen in the second posture using the three-sided vibration test jig described in Example 2 of the present invention. [Figure 11] FIG. 11 is a diagram illustrating the installation state when a vibration endurance test is performed on a double L-shaped bent pipe test specimen in a third posture using the three-sided vibration test jig described in Example 2 of the present invention. [Figure 12] FIG. 12 is a photograph of the conventional example taken from an obliquely upward direction. DETAILED DESCRIPTION OF THE INVENTION

[0015] BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vibration test fixture according to the present invention will be described below with reference to the drawings shown in FIGS.

[0016] (Description of the embodiment) A basic embodiment of a vibration test jig 1 of the present invention has a simple configuration as shown in FIGS. 1 to 4, and is made up of only a combination of three plane plates 2, 3, and 4 that are orthogonal to each other.

[0017] The vibration test fixture 1 typically has a mounting reference board 2 on its bottom side. The mounting reference board 2 is typically rectangular, as shown in detail in Figure 2, so that it can be attached to the vibration surface of the vibration endurance test device 1 with screws. Hexagonal socket head bolts, for example, are suitable for this purpose. Furthermore, multiple mounting holes 2a are pre-drilled at regular intervals across the entire surface of the board 2 to accommodate various test specimens. The spacing and number of these mounting holes 2a can be determined based on the intended mounting method and can be arranged to suit practical applications. Aluminum is typically used as the board 2, as it is easy to machine. Of course, the material can be selected depending on the type of vibration endurance test. The thickness, size, and shape of the mounting reference board 2 are determined based on the type of vibration endurance test. For a dedicated test specimen, the dimensions and hole drilling method can be customized to suit the specific test specimen. The shape of the mounting reference board 2 is not limited to a rectangle, but may be any other shape as long as the left end face 2d and the rear end face 2e are perpendicular to each other, and the shape of the plane 2s formed by the other end faces may be polygonal. In extreme cases, it may be triangular, but it is usually rectangular.

[0018] The illustrated mounting reference board 2 has a horizontally elongated rectangular shape. Its periphery is formed with a front end face 2g, a rear end face 2e, a right end face 2f, and a left end face 2d, which are perpendicular to the plane of the first side panel 3. In particular, in Figure 2, the left end face 2d has multiple, evenly spaced mounting holes 2b (five in Figure 2) drilled at its end face for connecting and fixing the first side panel. Threaded holes may be used if necessary; however, the number of holes must be determined to ensure that the mounting is securely fixed. Similarly, the rear end face 2e has multiple, evenly spaced mounting holes 2c (seven in Figure 2) drilled at its end face for connecting and fixing the second side panel 4. The number of mounting holes 2a is designed and drilled to ensure that the mounting is securely fixed and does not loosen due to vibrations during the vibration endurance test. The mounting holes 2c may be threaded holes if necessary. When tightening the screws, a built-in spring washer may be used to prevent loosening due to severe vibration.

[0019] Specifically, the plane 2s of the mounting reference substrate 2 is rectangular. A plate thickness of 6 mm to 15 mm is often selected. The size of one side of the rectangle is typically in the range of 120 mm to 800 mm. The material used is the aforementioned aluminum, which is lighter than steel and has excellent workability. In some cases, a resin material may be used to reduce weight. Among resin materials, transparent polycarbonate may be used because it is transparent and allows for easy visual confirmation.

[0020] As explained above, the mounting reference board 2 has mounting holes 2a for mounting to the vibration endurance tester's vibration table. As mentioned above, the mounting holes 2b and 2c are drilled on the end faces along the left end face 2d and rear end face 2e. That is, the mounting holes 2a for mounting to the vibration table are often drilled in a grid pattern with a 100 mm pitch, for example, as 10 mm diameter through-holes that can accept M10 hexagon socket head bolts. When directly fixing to the vibration exciter, the holes are drilled to match the positions of the holes on the vibration exciter. The mounting holes 2b and 2c for mounting the first side panel 3 and the second side panel 4 are either holes that can accept M3 to M10 hexagon socket head bolts or screw holes that can accept M3 to M10 hexagon socket head bolts, depending on the thickness of the panels.

[0021] The first side panel 3 shown in Figure 3 has a horizontally elongated rectangular shape and is made of the same material as the mounting reference board 2, such as an aluminum plate. Its thickness is sufficient to allow for the drilling of the fixing holes 3b. The periphery is formed with a bottom end face 3d, a top end face 3e, a right end face 3f, and a left end face 3g, which are perpendicular to the plane of the first side panel 3. A plate of the same thickness as the mounting reference board 2 is generally used, and the bottom end face 3d has multiple fixing holes 3b (e.g., five in the illustrated example). The depth of the fixing holes 3b shown is naturally set to a depth that prevents the screws from loosening due to vibration during a vibration endurance test. When tightening the screws, embedded spring washers can be used to prevent loosening. As shown in Figure 1, the first mounting screws 6 may be firmly attached from the underside of the mounting reference board 2, sometimes using adhesive in combination. If the substrate material is aluminum, the screws bite into it, allowing it to be fixed to the ridge with no play.

[0022] In addition, the right end surface 3f of the first side panel 3 is provided with multiple equally spaced mounting holes 3c (e.g., four mounting holes 3c in the example shown in Figure 3). The size, number, diameter, and length of these mounting holes 3c vary depending on the type of vibration endurance test, and are determined in accordance with practical requirements. The mounting state will be described later. Furthermore, an example is shown in which four mounting holes 3a for jigs used to attach test specimens during vibration endurance tests are provided in the upper right corner of the first side panel 3. The locations of these mounting holes 3a vary depending on the shape of the test specimen. The mounting holes 3a shown in Figure 3 are set holes set along the mounting jig for a pipe-shaped test specimen, for example. In other words, they are holes used to attach the fixing jig for the pipe-shaped test specimen.

[0023] A typical example of the first side panel 3 is one with a thickness of 6 mm to 15 mm and a rectangular shape with a side length selected from a range of 120 mm to 800 mm. The length of the side attached to the bottom end surface 3d is the same as the length of the end surface to which the mounting reference board 2 is bonded. The height is adjusted to match the height of the mounting portion of the test object. The mounting surface is machined into a shape suitable for mounting the rear end of the object to be tested for vibration durability. Four mounting holes 3a are provided, each for direct mounting of the object to be tested for vibration durability or for attaching a joint for mounting the object to be tested for vibration durability. When bonding is performed using adhesive, mounting holes may not be provided. The mounting surface is fixed vertically to the mounting holes 2b of the mounting reference board 2 using screws and adhesive, and is threaded, known as blind holes, 3b drilled in the bottom end surface 3d of the first side panel 3.

[0024] Figure 4 shows a detailed view of the rectangular second side panel 4. The second side panel 4 has a horizontally elongated rectangular shape and is made of the same material as the mounting reference board 2, such as an aluminum plate. Its thickness is sufficient to allow for the drilling of the mounting holes 4a. Its horizontal length corresponds to the length of the side surface 2e of the mounting reference board 2. Basically, a plate with the same thickness as the mounting reference board 2 is used. The second side panel 4 has equally spaced blind holes 4a drilled at its bottom surface 4d for screwing to the mounting reference board 2. In the example shown in Figure 4, seven mounting holes 4a are provided. The diameter, length, and number of the mounting holes 4a are determined based on the mounting strength. The second side panel 4 is basically manufactured with the same design as the first side panel 3. Therefore, the second side panel 4 is attached to the mounting reference board 2 at its bottom surface 4d, and a mounting hole 4b is provided at its left side surface 4g so that it can be screwed into the mounting hole 3c of the first side panel 3. In the example of FIG. 4, four fixing mounting holes 4b are shown.

[0025] As with the first side panel 3, the second side panel 4 has a thickness selected from the range of 6 mm to 15 mm. The size of one side of the rectangle is preferably selected from the range of 120 mm to 800 mm. The mounting method is the same as for the first side panel 3, and the mounting surface is fixed vertically to the mounting holes 4a on the lower end surface 4d of the second side panel 4 by passing the mounting holes 2c on the mounting reference board 2 through the mounting holes 2a and 2c with hexagon socket head bolts or the like and using adhesive in combination.

[0026] Referring to Figure 1, a three-sided vibration test jig 1 as Example 1 will be described. First, the mounting holes 3b on the lower end surface 3d of the first side panel 3 are positioned on the upper surface along the side wall on the left end surface 2d side of the mounting reference board 2 so as to align with the mounting holes 2b, and mounting screws 6, such as hexagon socket head bolts, are screwed into the mounting holes 3b of the first side panel 3 through the mounting holes 2b of the first side panel 3. Furthermore, the mounting holes 4a on the lower end surface 4d of the second side panel 4 are positioned in the mounting holes 2c on the surface along the edge of the rear end surface 2e of the mounting reference board 2, and the second side panel 4 is screwed in at seven locations with second mounting screws 7, such as hexagon socket head bolts.

[0027] The first side panel 3 and the second side panel 4 are fixed together by third mounting screws 8, such as hexagon socket head bolts, which connect mounting holes 4b, which are evenly spaced along the edge of the left end face 4g of the second side panel 4, to mounting holes 3c, which are drilled on the right end face 3f of the first side panel 3. If necessary, adhesive can be applied to the surfaces of the third mounting screws 8 or the mounting holes 3c before fastening, ensuring sufficient resistance to vibrations during a vibration endurance test. Furthermore, if necessary, the overlapping portions of the right end face 3f of the first side panel 3 and the left end face 4g of the second side panel can also be secured using adhesive in addition to the screws. As described above, the first mounting screws 6, second mounting screws 7, and third mounting screws 8 are combined and fastened together, resulting in the assembly shown in Figure 1. This three-sided vibration test jig 1 maintains strength close to that of a single unit and can withstand the vibrations of a vibration endurance test. In the case of aluminum, the mounting reference substrate 2, the first side panel 3, and the second side panel 4 can be fixed by welding, but generally, screw fixing as described above is used.

[0028] For example, each plate is made of aluminum. Vibration analysis of a three-sided vibration test jig 1 with a plate thickness of 10 mm, dimensions of 400 mm wide x 300 mm deep x 210 mm high, and a weight of 7.14 kg revealed a resonant frequency of 241 Hz, with the corner farthest from the screwed portion as its apex. In this example, vibration occurs with the corner of the open end 4oe of the second side panel 4 as its apex, but within a relatively narrow range. We hypothesized that removing this vibrating portion would further increase the ridge, and therefore attempted to create a shape for the three-sided vibration test jig 10 of Example 2 below.

[0029] A second three-sided vibration test jig 10, which is Example 2, will be described. The same parts of the first three-sided vibration test jig 1 as those of Example 1 are designated by the same reference numerals, and their description will be omitted. As a result of the vibration analysis of the vibration simulation test described above, the open end 3oe of the first side panel 3 and the open end 4oe of the second side panel 4 of the three-sided vibration test jig 1 vibrate significantly. The parts joined and fixed with the side panel mounting screws are relatively less susceptible to vibration, but the further away they are from the parts fastened and fixed with the mounting screws 6, 7, and 8 of the side panels 3 and 4, the greater the amplitude of vibration. If these parts are not necessary for the vibration endurance test, they can be cut off to create a more ridged structure.

[0030] Based on the above findings, a second three-sided vibration test jig 10 is illustrated in FIG. 5 as Example 2. Explanations of the same parts as those of the first three-sided vibration test jig 1 in FIG. 1 will be omitted to avoid redundancy. Only the differences from Example 1 in FIG. 1 will be explained. The open end side 3oe of the first side panel 3 and the open end side 4oe of the second side panel 4 are cut off. That is, the cut-off portions have cut-off surfaces 3cu and 4cu. The presence of these cut-off portions reduces the weight of the second three-sided vibration test jig 10. This weight reduction allows for vibration endurance tests to be performed at higher vibration frequencies.

[0031] A vibration test jig was constructed using aluminum material with a weight of 6.55 kg, and vibration analysis revealed that the resonant frequency was 324 Hz, with the corner part on the open end side of the second side panel 4 resonating, resulting in a ridged three-sided vibration test jig 10 with very little vibration.

[0032] 6. In this embodiment, the open end side 3ce of the first side panel 3 and the open end side 4ce of the second side panel 4, or rather the cut-off surfaces 3cu and 4cu, are formed by curve machining to form arc surfaces 3ar and 4ar so that they form gentle curves all the way to the mounting reference board 2. This shape is an embodiment that reflects the results of topology optimization analysis.

[0033] Furthermore, the closed end sides 3ce, 4ce of the first side panel 3 and the second side panel 4 are cut away to create arc surfaces 3ar, 4ar, and form openings 5. The third three-sided vibration test jig 20 having this shape can be created by simply machining the plate shape to match the shape resulting from analysis such as topology optimization. As a result, a high-performance three-sided vibration test jig can be obtained that is lightweight, inexpensive, and has a high resonance frequency.

[0034] The material used was aluminum, with a plate thickness of 10 mm, jig dimensions of 185 mm wide x 218 mm deep x 210 mm high, and a weight of 2.50 kg. Vibration analysis revealed a resonant frequency of 475 Hz, with only vibration occurring in a narrow area around the corner of the top end surface 3e of the first side panel 3, demonstrating excellent results. As can be seen from a comparison with the test results above, the embodiment of Figure 5 can achieve a higher frequency than the embodiment of Figure 1. Furthermore, it was demonstrated that the embodiment of Figure 6 is capable of vibration endurance testing at higher frequencies than the embodiment of Figure 5.

[0035] An example of using the three-sided vibration test jig shown above will be explained with reference to the first vibration endurance test application explanatory diagram 30, in which a pipe-shaped vibration endurance test object 12, such as various automobile mufflers, is subjected to the fixing jig of the present invention.

[0036] First, referring to FIG. 30, a first vibration endurance test application explanatory diagram using the fixture of the present invention will be described. The mounting state of a pipe-shaped vibration endurance test object 12 having an S-shaped bent portion 12c shown in FIG. 7 will be described. In this mounting state, one end 12a of the pipe-shaped vibration endurance test object 12 is fitted into the cylindrical holding portion of a fixture 13 of the same type, and is then screwed to the diaphragm of a vibration endurance test apparatus (not shown) through a pair of mounting holes 13a. The other end 12b is fitted and fixed to a fixing jig 14 at the other end provided on the upper surface of the first side panel 3 of the mounting reference board 2 of a third three-sided vibration test jig 20 shown in FIG. 6. The object is then screwed to the diaphragm of a vibration endurance test apparatus (not shown) through multiple mounting holes 2a in the mounting reference board 2. That is, one end 12a and the other end 12b of the pipe-shaped vibration endurance test object 12 are fixed in a state where they are sandwiched between fixing jigs 13 and 14, and the vibration endurance test is performed while the object is fixed so that it will not come loose due to the vibrations of the vibration endurance test.

[0037] Next, we will explain the second vibration endurance test application using the fixture of the present invention, ie, the mounting state of a pipe-shaped vibration endurance test object 16 having a crank-shaped bent portion 16c shown in FIG. 8. In this mounting state, as in FIG. 7, one end 16a of the pipe-shaped vibration endurance test object 12 is fitted into the cylindrical holding portion of a fixture 13 of the same type as in FIG. 7 and fixed to the diaphragm of a vibration endurance test apparatus (not shown) through a pair of mounting holes. The other end 16b is fitted and fixed to the other end of the fixture 14 provided on the upper surface of the first side panel 3 of the mounting reference substrate 2 of a third three-sided vibration test jig 20. The difference from the example in FIG. 7 is that the center of the crank-shaped bent portion 16c of the pipe-shaped vibration endurance test object 16 is fixed using a third three-sided vibration test jig 20 that is taller than the third three-sided vibration test jig 20 used to fix the other end 16b.

[0038] In this mounting example, the central portion of crank-shaped bent portion 16c is clamped by fixing jig 15 near the central portion on the upper corner side of the outer portion of first side panel 3, and is screwed through mounting hole 15a. This pipe-shaped vibration endurance test object 16 is mounted and fixed in a clamping state between fixing jig 13 and fixing jig 14, and further, the central portion of crank-shaped bent portion 16c is fixed by fixing jig 15 so that it will not come loose due to vibrations during the vibration endurance test, and the vibration endurance test is then performed.

[0039] Next, a vibration endurance test example using an S-shaped pipe-shaped vibration endurance test object 18 (see FIG. 50) in three vibration configurations will be described with reference to FIGS. 9 to 11. This vibration endurance test example uses the second three-sided vibration test jig 10 shown in FIG. 5, which is large enough to completely encase the pipe-shaped vibration endurance test object 18. One end 18a of the pipe-shaped vibration endurance test object 18 is fixed by screws to the end face on the inside of the mounting reference board 2, which faces the cutout surface 3cu. The other end 18b is fixed by screws to the fixing jig 13 on the inside upper side of the first side panel 3. The other end 18b is fitted and fixed by a fixing jig 14 provided on the inside upper side of the first side panel 3. The configuration shown in FIG. 9 is used for a vibration endurance test, where the pipe-shaped vibration endurance test object 18 is fixed by screws to the diaphragm of a vibration endurance test device (not shown) using the multiple mounting holes 2a required for fixing the mounting reference board 2. In this way, whether to change the vibration mode and perform the vibration endurance test is determined by the user.

[0040] Fig. 10 illustrates an example of a vibration endurance test using the vibration test jig of Fig. 9 in a different vibration mode from that shown in Fig. 9. That is, the jig is fixed to the diaphragm of a vibration endurance test device (not shown) using the multiple fixing mounting holes 4b provided on the second side panel 4, and the vibration endurance test is performed in this vibration mode.

[0041] 11 illustrates an example of a vibration endurance test performed in a different vibration mode from that shown in FIG. 9 or 10. That is, the first side panel 3 is fixed to a vibration plate of a vibration endurance test device (not shown) using a plurality of fixing mounting holes 3b provided in the first side panel 3, and the vibration endurance test is performed in this vibration mode.

[0042] (Description of Modifications) In the embodiment shown in FIGS. 1 , 5 , and 6 , the first side panel 3 and the second side panel 4 are fastened by screws through the mounting holes 2b and 2c drilled along the left end surface 2d and rear end surface 2e of the mounting reference board 2, respectively, and by the combination of the fixing mounting holes 3b and 4a drilled in the first side panel 3 and the second side panel 4. This is just one example, and a method may be used in which multiple equally spaced mounting holes are formed on the lower end surface 3d of the first side panel 3, fixing mounting holes are formed on the left end surface 2d of the mounting reference board 2, and the first side panel 3 and the second side panel 4 are fastened by the first mounting screws 6. Similarly, a method may be used in which multiple equally spaced mounting holes are formed on the lower end surface 4d of the second side panel 4, fixing mounting holes are formed on the rear end surface 4d of the mounting reference board 2, and the second side panel 4 is fastened by the second mounting screws 7. Furthermore, the first side panel 3 and the second side panel 4 may also be fastened by the third mounting screws 8, which completely reverses the relationship between the fixing mounting holes 4b and 3c. The key point is that the fixing relationship must be firm enough so that it does not loosen during vibration endurance tests. [Explanation of symbols]

[0043] 1. First three-sided vibration test jig 2 Mounting reference board 2a Mounting hole 2d left end surface 2e Rear end surface 2f Right end surface 2g Front end surface 2h Corner 2s plane 2cu cut-off surface 3 First side panel 3a Mounting hole of the mounting jig for the test object 3d bottom surface 3e Top surface 3f Right end surface 3g Left end surface 3ar Arc surface 3ce Closed end side 3cu cut-off surface 3oe open end side 4 Second side panel 4d Bottom surface 4e Top surface 4f right end face 4g Left end 4ar Arc surface 4ce Closed end side 4cu cut-off surface 4oe open end side 5 aperture 10 Second three-sided vibration test fixture 12 Pipe-shaped vibration endurance test object with S-shaped bend 20 Third three-sided vibration test fixture 30. First vibration endurance test application explanatory diagram using the fixture of the present invention 40 Second vibration endurance test application explanatory diagram using the fixture of the present invention 50 Third vibration endurance test application explanatory diagram using the fixture of the present invention

Claims

1. a mounting reference substrate having a plate-like shape with a plurality of mounting holes formed in a thickness direction thereof, at least three end faces perpendicular to a plane of the plate, and two of the end faces being formed so as to be orthogonal to each other; a first side plate having plate-like ends that are integral with or joined together and have a length that follows one of the orthogonal end faces of the mounting reference board; a second side plate having plate-like ends that are integral with or bonded to each other and have a length that is along the other orthogonal end face of the mounting reference board, and having a left end face that is orthogonal to the right end face of the first side plate that is integral with or bonded to each other; A three-sided vibration test fixture.

2. 2. A three-sided vibration test fixture according to claim 1, wherein the first side panel has a cut-off surface at the open end side thereof and the second side panel has a cut-off surface at the open end side thereof.

3. 2. The three-sided vibration test fixture according to claim 1, wherein the corners where the three surfaces of the mounting reference board, the first side panel, and the second side panel intersect have openings cut out.

4. 3. A three-sided vibration test fixture according to claim 2, wherein the cut-off surfaces on the open end sides of the first side panel and the second side panel are arc-shaped.

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