Panel member

Abstract

To improve the accuracy of wind tunnel test while reducing workload when conducting wind tunnel test.SOLUTION: A panel member is formed by a 3D printer and constitutes outer faces in a model used for wind tunnel test. The panel member includes a first face, a second face, a through-hole, and a structure part. The first face forms the outer face of the model. The second face is located on the side opposite the first face. The through-hole is a part used in wind tunnel test and penetrates the panel member from the first face toward the second face. The structure part is provided in correspondence to the through-hole in order for wind tunnel test. The through-hole and the structure part are formed integrally with the panel member by a 3D printer.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to panel members used in models used in wind tunnel testing. [Background technology]

[0002] As described in Patent Documents 1 and 2, a technique has been proposed for forming a model of a moving body using a 3D printer in order to perform wind tunnel testing of the moving body such as an airplane. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4310043 [Patent Document 2] Patent No. 4446608 Summary of the Invention [Problem to be solved by the invention]

[0004] In such wind tunnel tests, for example, wind pressure may be measured using through holes formed in a model of a moving object. However, in the past, the through holes in the model were formed using a drill or the like, which required a large workload and, further, errors in the position of the through holes occurred, which could result in a decrease in the accuracy of the wind tunnel test.

[0005] In one aspect of the present disclosure, it is desirable to improve the accuracy of wind tunnel testing while reducing the workload involved in conducting wind tunnel testing. [Means for solving the problem]

[0006] One aspect of the present disclosure relates to a panel member that constitutes an outer surface of a model used in a wind tunnel test and is formed by a 3D printer. The panel member includes a first surface, a second surface, a through hole, and a structural portion. The first surface forms the outer surface of the model. The second surface is located on the opposite side of the first surface. The through hole is a portion used in the wind tunnel test that penetrates the panel member from the first surface to the second surface. The structural portion is provided in correspondence with the through hole for the wind tunnel test. The through hole and the structural portion are formed integrally with the panel member by the 3D printer.

[0007] According to the above-mentioned configuration, the through hole and the structural portion are formed integrally with the panel member by a 3D printer, which reduces the workload when performing a wind tunnel test and improves the accuracy of the wind tunnel test.

[0008] In one aspect of the present disclosure, the structural part is configured to hold the tubular member inserted into the through hole in a state where it protrudes from the second surface, and the tubular member may have protrusions protruding from the outer circumferential surface at positions away from both ends. The structural part may also include a storage part and a claw part. The storage part is a recessed part on the inner circumferential surface of the through hole, adjacent to the opening on the second surface of the through hole, and configured to store the protrusion of the tubular member inserted into the through hole. The claw part protrudes from an edge part surrounding the opening on the second surface of the through hole along the extension direction of the through hole and is configured to abut against the tubular member inserted into the through hole. The claw part may also have a recess formed in a part located around the second surface on the inner surface facing the tubular member inserted into the through hole for storing the protrusion of the tubular member inserted into the through hole.

[0009] According to the above configuration, the tubular member can be easily inserted into the through hole and the tubular member inserted in the through hole can be well held, thereby reducing the workload when performing a wind tunnel test.

[0010] In one aspect of the present disclosure, the protrusion may be provided around an outer circumferential surface of the tubular member. The housing may be formed around an inner circumferential surface of the through hole. The structure may include a plurality of claws arranged side by side to surround the opening in the second surface of the through hole.

[0011] According to the above configuration, the tubular member can be easily inserted into the through hole and the tubular member inserted in the through hole can be well held, thereby reducing the workload when performing a wind tunnel test.

[0012] In one embodiment of the present disclosure, the panel member is formed by two-color molding, so that the claw portion and a peripheral portion of the panel member around the claw portion may be made of different resins. According to the above configuration, by appropriately selecting the resin that constitutes the multiple claw portions, it is possible to appropriately adjust the ease with which the tubular member is inserted into the through hole and the strength of the force acting to hold the tubular member inserted into the through hole.

[0013] In one aspect of the present disclosure, the structural portion may include a connection portion that is a portion arranged to protrude from the second surface, has an opening that communicates with the through hole, and is configured to connect a test tube used in wind tunnel testing.

[0014] According to the above configuration, the test tube can be easily connected, thereby reducing the workload when conducting a wind tunnel test. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is an explanatory diagram of a vehicle model according to the first embodiment. [Diagram 2] 4 is a perspective view of a Venturi tube inserted into a through hole and a plurality of claws in the first embodiment. FIG. [Diagram 3] 3 is a cross-sectional view including axes of the through hole and the Venturi tube, showing a through hole, a Venturi tube inserted into the through hole, and a plurality of claws in the first embodiment. FIG. [Figure 4] FIG. 11 is a perspective view of a connection portion in the second embodiment. [Diagram 5] 13 is a cross-sectional view of a through hole and a connection portion in a second embodiment, the cross-sectional view including the axis of the through hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the following embodiments, and various forms may be adopted as long as they fall within the technical scope of the present disclosure.

[0017] [1. First embodiment] [(1) Overview] A four-wheeled automobile model 1 of the first embodiment is used for wind tunnel testing and includes a plurality of panel members 10 and a framework 14 (see FIG. 1). Note that the model 1 may be the same size as an actual automobile, or may be a scaled-down or scaled-up version of the actual automobile.

[0018] The panel members 10 are resin members that form the outer surface of the model 1, and are formed by a 3D printer. Specifically, each panel member 10 is provided corresponding to a part that constitutes the outer surface of an automobile, such as a bonnet, glass, a front grille, tires, doors, bumpers, etc., of an automobile, and has the shape of the corresponding part.

[0019] The skeleton 14 is a frame-like portion disposed inside the model 1. The model 1 is constructed by attaching each panel member 10 to the skeleton 14. A space is formed inside the panel members 10 in the model 1. A pedestal (not shown) is provided inside the skeleton 14, and measuring equipment and the like for performing wind tunnel testing are placed on the pedestal.

[0020] [(2) Panel components] At least one of the plurality of panel members 10 is provided with at least one through hole 2 for performing pressure measurements for wind tunnel testing (see FIGS. 2 and 3). Furthermore, the panel member 10 is provided with structural portions 3 corresponding to each through hole 2 for performing pressure measurements for wind tunnel testing. In the first embodiment, as an example, the panel member 10 forming the bonnet is provided with a plurality of through holes 2 and a plurality of structural portions 3 corresponding to each through hole 2, arranged at predetermined intervals along the front-rear direction of the automobile.

[0021] Furthermore, these through holes 2 and structural portions 3 are formed when the panel member 10 is formed by a 3D printer. In other words, the multiple through holes 2 and multiple structural portions 3 are not formed by processing the panel member 10 formed by the 3D printer, but are formed integrally with the panel member 10 by the 3D printer.

[0022] [(3) Through hole] The panel member 10 in which the through holes 2 are provided has a plate-shaped portion 11 (see Figs. 2 and 3). The plate-shaped portion 11 has first and second faces 12 and 13 that face each other in the thickness direction. The first face 12 forms the outer face of the model 1, and the second face 13 is located inside the model (see Fig. 1). A plurality of through holes 2 are formed in the plate-shaped portion 11 so as to penetrate the plate-shaped portion 11 from the first face 12 to the second face 13. Each of the through holes 2 extends linearly along the thickness direction of the plate-shaped portion 11, and a cross section (hereinafter simply referred to as a cross section) perpendicular to the extension direction (in other words, the axis A0) is circular. The axis A0 is a virtual straight line that passes through the center of the cross section of the through hole 2.

[0023] [(4) Tubular member] A tubular member 4 can be inserted into each through hole 2 (see Figs. 2 and 3). The tubular member 4 is cylindrical and extends straight along an axis A1. The axis A1 is an imaginary straight line passing through the center of a cross section (hereinafter simply referred to as a cross section) of the tubular member 4 perpendicular to the extension direction.

[0024] The tubular member 4 is inserted into the through hole 2 so that the first end is flush with the first surface 12 and the second end protrudes from the second surface 13. The tubular member 4 also has a curved protrusion 41 protruding from the outer circumferential surface 40 at a position away from both ends. As an example, the protrusion 41 is spherical and provided so as to go around the axis A1 (in other words, the outer circumferential surface 40). That is, the cross section of the protrusion 41 is a circle with the axis A1 passing through the center. The protrusion 41 is also circular when viewed from the side, and the axis A1 passes through the center of the circle.

[0025] [(5) Structural part] The structure 3 includes a storage portion 30 and a plurality of claw portions 31 (see FIGS. 2 and 3). The accommodation portion 30 is a recessed portion in the inner circumferential surface 20 of the through hole 2, and is provided adjacent to the opening 21 that the through hole 2 forms in the second surface 13 of the plate-like portion 11, and accommodates the protrusion 41 of the tubular member 4 inserted into the through hole 2. As an example, the accommodation portion 30 is hemispherical and provided so as to go around the axis A0 (in other words, the inner circumferential surface 20). In other words, the cross section of the accommodation portion 30 is a circle with the axis A0 passing through the center, and the diameter of the cross section increases toward the opening 21. Moreover, the cross section of the accommodation portion 30 including the axis A0 is arc-shaped.

[0026] The multiple claw portions 31 are configured to protrude from an edge portion surrounding the opening 21 of the through hole 2 on the second surface 13 along the extension direction of the through hole 2 (in other words, the direction of the axis A0) and to abut against an outer circumferential surface 40 of the tubular member 4 inserted into the through hole 2. As an example, in the first embodiment, four claw portions 31 are provided lined up at predetermined intervals so as to surround the opening 21.

[0027] Each claw portion 31 has an inner surface 32 facing the outer circumferential surface 40 of the tubular member 4 inserted into the through hole 2. A recess 33 for accommodating the protrusion 41 of the tubular member 4 inserted into the through hole 2 is formed around the second surface 13 of the inner surface 32. The recess 33 is adjacent to the accommodating portion 30 and is a portion curved in an arc shape on the inner surface 32, forming a depression in a portion of the inner surface 32 located at the base of the claw portion 31. The recess 33 is configured to accommodate the protrusion 41 of the tubular member 4 inserted into the through hole 2.

[0028] In other words, a substantially spherical space is formed by the recesses 33 of the claws 31 and the accommodation portion 30, and the protrusion 41 of the tubular member 4 inserted into the through hole 2 is accommodated in this space. The portion of each claw 31 that forms the recess 33 protrudes from the second surface 13 so as to be inclined toward the axis A0, and the width narrows toward the tip. The portion of each claw 31 that is closer to the tip than the recess 33 has a substantially constant width and extends along the axis A0. Slits are formed between each claw 31.

[0029] Furthermore, as an example, the plurality of claw portions 31 corresponding to each through hole 2 and the peripheral portion of the plurality of claw portions 31 in the panel member 10 are made of different resins by two-color molding. The peripheral portion may be, for example, a portion forming the storage portion 30 and the through hole 2 corresponding to the plurality of claw portions 31. Specifically, for example, the plurality of claw portions 31 may be made of a resin having higher flexibility and elasticity than the peripheral portion. Also, for example, not limited to the peripheral portion, the plurality of claw portions 31 corresponding to each through hole 2 and the portion of the panel member 10 other than these claw portions 31 may be made of different resins by two-color molding.

[0030] Then, the tubular member 4 is inserted into the through hole 2 from the second surface 13 side. At this time, each of the plurality of claws 31 is elastically deformed so as to be inclined outward, so that the protruding portion 41 of the tubular member 4 can reach the storage portion 30. When the protruding portion 41 reaches the storage portion 30, the plurality of claws 31 are deformed so as to return to their initial shape before insertion. At this time, the storage portion 30 and the recessed portion 33 of each claw 31 abut against the protruding portion 41. Also, the portion of the inner surface 32 of each claw 31 that is on the tip side of the recessed portion 33 abuts against the outer circumferential surface 40 of the tubular member 4 that is on the tip side of the protruding portion 41. When these abutments occur, each claw 31 is in a state in which elastic deformation has occurred, and the tubular member 4 is held by the elastic force of each claw 31 that tries to return to its initial shape.

[0031] (6) Wind tunnel testing In the wind tunnel test of the first embodiment, as an example, a simplified measurement of wind pressure, wind speed, etc. is performed using a Venturi tube arranged on the outer surface of the model 1. That is, a test tube 5 connects a measuring device arranged inside the model 1 to the tubular member 4 inserted into the through hole 2 (see FIG. 2). Then, the measuring device measures the pressure generated inside the tubular member 4, thereby measuring the wind pressure, wind speed, etc. around the through hole 2 on the outer surface of the model 1.

[0032] In such pressure measurement, all or some of the through holes 2 provided in the panel member 10 are used. The through holes 2 not used in the pressure measurement may be blocked by a blocking member (not shown). The blocking member may be a member having a shape similar to that of the tubular member 4. That is, the blocking member may be a cylindrical member having a protrusion formed on its outer circumferential surface similar to that of the tubular member 4. When the blocking member is inserted into the through hole 2, the first end of the blocking member becomes flush with the first surface 12 of the panel member 10, and similar to the tubular member 4, the protrusion is accommodated in the recess 33 and the accommodation portion 30 of each claw portion 31, and the blocking member may be held by the multiple claw portions 31.

[0033] Then, the second end of the tubular member 4 inserted into the through hole 2, protruding from the second surface 13, is inserted into the first end of the test tube 5, and the second end of the test tube 5 is connected to a measuring device arranged inside the model 1. This allows the tubular member 4 to communicate with the measuring device, and the measuring device can measure the pressure inside the tubular member 4.

[0034] Of course, the present invention is not limited to this, and in the wind tunnel test, measurements other than pressure measurements may be performed using the through hole 2, the tubular member 4 inserted into the through hole 2, and / or the structural part 3. [2. Second embodiment] The automobile model 1 of the second embodiment differs from that of the first embodiment in the configuration of the structural portion 3 in the panel member 10 (see FIGS. 4 and 5). In the second embodiment, similarly to the first embodiment, the multiple through holes 2 and the multiple structural portions 3 are formed integrally with the panel member 10 by a 3D printer.

[0035] That is, the structural portion 3 includes a connection portion 34 that protrudes straight from the second surface 13 along the axis A0 of the through hole 2. In the second embodiment, the structural portion 3 is not provided on the inner peripheral surface 20 of the through hole 2, and the cross-sectional shape of the through hole 2 is constant.

[0036] The connection part 34 has a cylindrical base part 35 and an insertion part 36. The base part 35 protrudes from the second surface 13. On the other hand, the insertion part 36 has a smaller cross section than the base part 35 and protrudes from the center of the end face located at the tip of the base part 35. The through hole 2 penetrates the plate-like part 11, the base part 35 and the insertion part 36, and the axis A0 of the through hole 2 passes through the center of the cross section of the insertion part 36 and the center of the cross section of the insertion part 36, and the opening 21 of the through hole 2 is formed at the tip of the insertion part 36. In addition, a plurality of protrusions (not shown) protruding outward are formed on the outer peripheral surface of the insertion part 36 around the tip of the insertion part 36.

[0037] Then, the insertion portion 36 of the structural part 3 is inserted into the first end of the test tube 5, thereby connecting the through hole 2 to the measuring instrument, and the measuring instrument becomes able to measure the pressure inside the through hole 2.

[0038] In the second embodiment, the structural portion 3 and the peripheral portion of the structural portion 3 in the panel member 10 may be made of the same resin. Also, in the second embodiment, in the wind tunnel test, the through hole 2 and / or the structural portion 3 may be used to perform measurements other than pressure measurements.

[0039] [3. Effects] (1) According to the above embodiment, the through holes 2 and the structural portion 3 are formed integrally with the panel member 10 by a 3D printer. Therefore, it is not necessary to later form through holes using a drill or the like or to attach the structural portion 3 to the panel member 10 formed by the 3D printer. As a result, the workload is reduced and the positions of the through holes 2 and the structural portion 3 can be determined with high accuracy. Therefore, the workload when performing a wind tunnel test can be reduced while improving the accuracy of the wind tunnel test.

[0040] (2) Furthermore, according to the first embodiment, the accommodating portion 30 and the multiple claw portions 31 of the structural portion 3 enable the tubular member 4 to be inserted into the through hole 2 and the tubular member 4 inserted into the through hole 2 to be held. This makes it possible to easily insert the tubular member 4 into the through hole 2 and to satisfactorily hold the inserted tubular member 4. This reduces the workload when conducting a wind tunnel test.

[0041] (3) Furthermore, according to the first embodiment, by forming the panel member 10 by two-color molding, the plurality of claw portions 31 and the surrounding portions of the plurality of claw portions 31 in the panel member 10 are made of different resins. Therefore, by appropriately selecting the resins constituting the plurality of claw portions 31, it is possible to appropriately adjust the ease of inserting the tubular member 4 into the through hole 2 and the strength of the force acting to hold the tubular member 4 inserted into the through hole 2.

[0042] (4) Furthermore, according to the second embodiment, it is easy to connect the test tube 5 and the through hole 2. This reduces the workload when conducting a wind tunnel test. [4. Other embodiments] (1) The model 1 for performing the wind tunnel test in the above embodiment is a model of a four-wheeled automobile. However, the present invention is not limited to this, and a model for wind tunnel test may be configured in a similar manner for vehicles other than four-wheeled automobiles (e.g., motorcycles, etc.). Furthermore, the present invention is not limited to this, and a model for wind tunnel test may be configured in a similar manner for moving bodies such as railroad cars, aircraft, ships, drones, etc. Furthermore, a model for wind tunnel test may be configured in a similar manner for objects other than moving bodies (e.g., buildings).

[0043] (2) In the above embodiment, the through hole 2 extends straight through the panel member 10 in the thickness direction. However, this is not limited thereto, and the through hole 2 may be inclined or curved with respect to the thickness direction. Even in such a case, the same effect can be obtained by appropriately adjusting the direction and shape of the structural portion 3 according to the direction and shape of the through hole 2.

[0044] (3) In the first embodiment, the number of claw portions 31 in the structure 3 is not limited to four, and may be two to three, or five or more. The number of claw portions 31 may be one. Moreover, the protruding portion 41 is spherical, but is not limited thereto, and the protruding portion 41 may have various shapes other than spherical. Moreover, the protruding portion 41 of the tubular member 4 is provided so as to revolve around the axis A1. However, the protruding portion 41 may have a shape that does not revolve around the axis A1. In other words, the protruding portion 41 may be provided in a region of the outer circumferential surface 40 that does not revolve around the axis A1.

[0045] In this case, the storage portion 30 of the structural portion 3 and the recessed portion 33 in one or more claw portions 31 have shapes corresponding to the protruding portion 41. As a result, when the tubular member 4 is inserted into the through hole 2 and the protruding portion 41 reaches the storage portion 30, the storage portion 30 and the recessed portion 33 of the claw portion 31 abut against the protruding portion 41, and the inserted tubular member 4 is held in the same manner as in the first embodiment.

[0046] (4) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0047] 1...model, 10...panel member, 11...plate-shaped portion, 12...first surface, 13...second surface, 14...skeletal portion, 2...through hole, 20...inner surface, 21...opening, 3...structural portion, 30...accommodation portion, 31...claw portion, 32...inner surface, 33...recess, 34...connection portion, 35...base, 36...insertion portion, 4...tubular member, 40...outer surface, 41...protrusion, 5...test tube.

Claims

1. A panel member that constitutes an outer surface of a model used in a wind tunnel test and is formed by a 3D printer, a first face forming the exterior surface of the model; a second surface located opposite the first surface; a through hole that is a portion used in the wind tunnel test and that penetrates the panel member from the first surface to the second surface; A structure provided corresponding to the through hole for the wind tunnel test; Equipped with The through hole and the structural portion are formed integrally with the panel member by a 3D printer. Panel material.

2. 2. The panel member according to claim 1, the structural portion is configured to hold a tubular member inserted into the through hole in a state where the tubular member protrudes from the second surface, and the tubular member has protrusions protruding from an outer circumferential surface at positions spaced from both ends thereof, The structure includes: a receiving portion that is a recessed portion on an inner circumferential surface of the through hole, the receiving portion being adjacent to an opening on the second surface of the through hole and configured to receive the protrusion of the tubular member inserted into the through hole; a claw portion that protrudes from an edge portion surrounding the opening of the second surface of the through hole along an extension direction of the through hole and is configured to abut against the tubular member inserted into the through hole; Equipped with The claw portion has a recess formed in a portion located around the second surface on an inner surface facing the tubular member inserted into the through hole, the recess being adapted to accommodate the protrusion of the tubular member inserted into the through hole. Panel material.

3. 3. The panel member according to claim 2, The protrusion is provided so as to go around the outer circumferential surface of the tubular member, The housing portion is formed so as to surround the inner circumferential surface of the through hole, The structural portion includes a plurality of the claw portions arranged side by side so as to surround the opening in the second surface of the through hole. Panel material.

4. The panel member according to claim 2 or 3, By forming the panel member by two-color molding, the claw portion and the peripheral portion of the panel member around the claw portion are made of different resins. Panel material.

5. 2. The panel member according to claim 1, The structural portion includes a connection portion that is a portion provided so as to protrude from the second surface, has an opening communicating with the through hole, and is configured to be connected to a test tube used in the wind tunnel test. Panel material.

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