Test Equipment

Abstract

To maintain rigidity against deformation in a direction crossing the width direction of a punch, and to suppress buckling in a process of pressurizing the punch into the specimen.SOLUTION: A testing device 100 includes: a pair of rollers 101-1 and 101-2, which are spaced apart so that their rotational axes are parallel to each other; a pressing member 103 which is provided so that it can get in and out between the pair of rollers 101-1 and 101-2, and presses a sample to be measured placed on the rollers between the pair of rollers 101-1 and 101-2 at a predetermined speed; and load measuring means for measuring load applied to the pressing member 103. The pressing member 103 includes: a punch 131 which has a predetermined width and pressurizes the sample to be measured; and a punch support 132 which prevents deformation of the punch 131 in a direction crossing the width direction of the punch 131.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to testing apparatus, for example, material bending testing apparatus. [Background technology]

[0002] A three-point bending test method is a common bending test method for sheet materials. For example, Patent Document 1 describes a bending test device in which a sheet test piece is placed on two rollers so that both ends of the sheet test piece are spread over the rollers, and the tip of a pressing metal fitting is placed on the center of the rollers, and a crossbar is moved upward to gradually press the sheet test piece, thereby bending the sheet test piece to a maximum bending angle θ of 180°. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-307477 A Summary of the Invention [Problem to be solved by the invention]

[0004] In order to impose a larger strain on the test piece, it is necessary to reduce the curvature R of the tip of the punch (metal punch) and make the punch itself thinner.

[0005] However, in the bending test device of Patent Document 1, there is a problem in that if the punch is made thin, there is a risk that the punch may buckle. [Means for solving the problem]

[0006] In one embodiment of the testing device, a support is attached to the pressing jig. Effect of the Invention

[0007] The testing device of the present invention can ensure rigidity against deformation in a direction intersecting the width direction of the punch, and can suppress buckling during the process of pressing the punch into the test piece. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing an example of a bending test apparatus. [Diagram 2] 1 is a schematic diagram showing an example of a bending test apparatus. [Diagram 3] 1 is a schematic diagram showing an example of a bending test apparatus. [Figure 4] 1 is a schematic diagram showing an example of a bending test apparatus. [Diagram 5] FIG. 2 is a top view of the test apparatus according to the first embodiment. [Figure 6] FIG. 2 is a front view of the test device according to the first embodiment. [Figure 7] FIG. 2 is a side view of the test device according to the first embodiment. [Figure 8] FIG. 2 is a front view of the test device according to the first embodiment. [Figure 9] FIG. 2 is a side view of the test device according to the first embodiment. [Figure 10] 2 is a top view of a bending punch 131 and a punch support 132 according to the first embodiment. FIG. [Figure 11] FIG. 2 is a front view of the test device according to the first embodiment. [Figure 12] FIG. 2 is a side view of the test device according to the first embodiment. [Figure 13] FIG. 11 is a top view of a test apparatus according to a second embodiment. [Figure 14] FIG. 11 is a front view of a test device according to a second embodiment. [Figure 15] FIG. 11 is a side view of a test device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First, the problem to be solved by the invention will be described in detail, and then how the problem is solved in this embodiment will be described.

[0010] 1 to 4 are schematic diagrams showing an example of a bending test device. As shown in Fig. 1, a test piece 21 is placed on rollers 11 and 12. A bending punch 13 presses the test piece 21 between rollers 11 and 12. When the test piece 21 is bent by this pressure, the load applied to the test piece 21 by the bending punch 13 is measured.

[0011] In order to bend the test piece 21 greatly with a small curvature R, it is necessary to make the bending punch 13 thin and reduce the curvature R of the tip of the bending punch 13. However, when the curvature R of the tip of the bending punch 13 is reduced, the rigidity of the bending punch 13 also decreases, and the bending punch 13 buckles when pressed in as shown in Figure 1. For this reason, there is an upper limit to the amount of strain that can be imparted to the test piece 21.

[0012] On the other hand, as a method for compensating for the rigidity of the bending punch 13, it is possible to increase the thickness with increasing distance from the tip of the bending punch 13, as shown in FIG.

[0013] However, if the thickness of the bending punch 13 is increased, the test piece 21 will interfere with the bending punch 13 as shown in Fig. 3. Therefore, it is desirable that the thickness of the bending punch 13 is small so that the test piece 21 does not interfere with the bending punch 13 as shown in Fig. 4.

[0014] Thus, there is a need for a test device that prevents buckling of the bending punch 13 and prevents the test piece 21 from interfering with the bending punch 13. A method for solving these problems will be described in the following embodiment.

[0015] (Embodiment 1) Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 5 is a top view of a test apparatus according to the first embodiment. Fig. 6 is a front view of the test apparatus according to the first embodiment. Fig. 7 is a side view of the test apparatus according to the first embodiment. In Figs. 5 to 7, a test apparatus 100 includes a roller 101-1, a roller 101-2, a bearing 102-1, a bearing 102-2, a pressing member 103, and backups 104-1 to 104-4. The pressing member 103 includes a bending punch 131, a punch support 132, and an apparatus connection portion 133.

[0016] The rollers 101-1 and 101-2 are cylindrical rollers. The rollers 101-1 and 101-2 are spaced apart so that their rotation axes are parallel to each other. If the direction in which the push-in member 103 is pushed in is defined as the height direction, the rollers 101-1 and 101-2 are installed to be at the same height.

[0017] Moreover, it is desirable that rollers 101-1 and 101-2 are provided with grooves on the side surface of the cylinders that are approximately 1 / 3 the thickness of test piece 21. With such a configuration, it is possible to suppress the movement of test piece 21 in the roller axial direction and to reduce friction between test piece 21 and the grooves of rollers 101-1 and 101-2.

[0018] The bearing 102-1 receives a load in contact with the roller 101-1. Similarly, the bearing 102-2 receives a load in contact with the roller 101-2.

[0019] The pushing member 103 is provided so as to be able to move in and out between the rollers 101-1 and 101-2. The pushing member 103 pushes the test samples placed on the rollers 101-1 and 101-2 into between the rollers 101-1 and 101-2 at a predetermined speed.

[0020] The bending punch 131 has a predetermined width and presses the sample to be measured. For example, the bending punch 131 is preferably in a plate shape. The thickness of the bending punch 131 is less than the gap between the rollers 101-1 and 101-2. The width of the bending punch 131 is greater than the widths of the rollers 101-1 and 101-2 and the sample to be measured.

[0021] The punch support 132 is fixed to an end surface in the width direction of the bending punch 131. The punch support 132 prevents deformation of the bending punch 131. The punch support 132 is preferably provided on both end surfaces in the width direction of the bending punch 131. Note that, if the strength of the bending punch 131 can be sufficiently reinforced, the punch support 132 may be provided on one end surface in the width direction of the bending punch 131. Note that, it is preferable not to place the punch support 132 at the tip of the bending punch 131 so that the bent portion of the sample piece can be observed.

[0022] The device connection unit 133 is configured to connect to a pressing means and a load measuring means (not shown). The pressing means moves the bending punch 131 in a direction to enter or exit between the rollers 101-1 and 101-2. The load measuring means is, for example, a push-pull gauge, and measures the load (N) applied to the pressing member.

[0023] The backups 104-1 to 104-4 are configured to suppress movement of the roller central shafts. Backups 104-1 to 104-4 are cylindrical and have a minimal contact surface with the rollers, so they do not impede the rotation of the rollers. By installing backups 104-1 to 104-4 in this way and eliminating any backlash between them in advance, roller movement during testing can be suppressed.

[0024] Next, the operation of the testing device 100 to press the test piece 21 will be described. Fig. 8 is a front view of the testing device according to the first embodiment. Fig. 9 is a side view of the testing device according to the first embodiment. Figs. 8 and 9 show a state in which the testing device 100 starts to press the test piece 21.

[0025] As shown in Fig. 10, the width of bending punch 131 is made larger than the widths of rollers 101-1 and 101-2. Fig. 10 is a top view of bending punch 131 and punch support 132 according to the first embodiment. Fig. 10 is a cross section taken along line A-A' in Fig. 9. With this configuration, in the testing apparatus 100, punch support 132 does not interfere with rollers 101-1 and 101-2.

[0026] Fig. 11 is a front view of the testing apparatus according to the embodiment 1. And Fig. 12 is a side view of the testing apparatus according to the embodiment 1. As shown in Fig. 11, bending punch 131 is inserted between roller 101-1 and roller 101-2, but as shown in Fig. 12, punch support 132 does not interfere with roller 101-1 and roller 101-2.

[0027] 11, the punch support 132 does not extend to the tip of the bending punch 131, so the bent portion of the test piece 21 is not covered by the punch support 132. Therefore, the bent portion of the test piece 21 can be observed.

[0028] Thus, according to the testing device of the first embodiment, by providing the punch support on the end face in the width direction of the bending punch, the punch support does not interfere with the roller, and buckling during the process of pushing the punch can be suppressed.

[0029] Furthermore, according to the testing device of embodiment 1, by providing a groove approximately 1 / 3 the thickness of the test piece on the cylindrical side of the roller on which the test piece is placed, it is possible to prevent the test piece from moving in the axial direction of the roller.

[0030] Furthermore, according to the testing device of the first embodiment, by providing a cylindrical backup that restricts the movement of the roller, the roller can be prevented from moving even if there is play in the roller bearing.

[0031] (Embodiment 2) Fig. 13 is a top view of the test apparatus according to the second embodiment, Fig. 14 is a front view of the test apparatus according to the second embodiment, and Fig. 15 is a side view of the test apparatus according to the second embodiment.

[0032] 13 to 15, the test device 200 includes a roller 201-1, a roller 201-2, a bearing 202-1, a bearing 202-2, a pressing member 203, and backups 204-1 to 204-4. The pressing member 203 includes a bending punch 231 and a punch support 204-1 to 204-4. 232 and a device connection portion 233.

[0033] The rollers 201-1 and 201-2 are cylindrical rollers. The rollers 201-1 and 201-2 are spaced apart so that their rotation axes are parallel to each other. If the pushing direction of the pushing member 103 is defined as the height direction, the rollers 201-1 and 201-2 are installed at the same height.

[0034] Unlike the rollers 101-1 and 101-2, the rollers 201-1 and 201-2 do not have grooves on the cylindrical side surface.

[0035] The bearing 202-1 receives a load in contact with the roller 201-1. Similarly, the bearing 202-2 receives a load in contact with the roller 201-2.

[0036] The pushing member 203 is provided so as to be movable between the rollers 201-1 and 201-2. The pushing member 203 pushes the test samples placed on the rollers 201-1 and 201-2 into the gap between the rollers 201-1 and 201-2 at a predetermined speed.

[0037] The bending punch 231 has a predetermined width and presses the sample to be measured. For example, the bending punch 231 is preferably in a plate shape. The thickness of the bending punch 231 is less than the gap between the rollers 201-1 and 201-2. The width of the bending punch 231 is greater than the widths of the rollers 201-1 and 201-2 and the sample to be measured.

[0038] The punch supports 232 are provided on two main surfaces of the bending punch 231 so as to be able to slide while sandwiching the bending punch 231. The punch supports 232 prevent deformation of the bending punch 231. That is, the punch supports 232 support the bending punch 231 as a guide. The position and size of the punch supports 232 may be any as long as they can prevent buckling at the initial stage of pressing.

[0039] The device connection unit 233 is configured to connect to a pressing means and a load measuring means (not shown). The pressing means moves the bending punch 231 in a direction to enter or exit between the rollers 201-1 and 201-2. The load measuring means is, for example, a push-pull gauge, and measures the load (N) applied to the pushing member.

[0040] The backups 204-1 to 204-4 are configured to suppress the movement of the roller central shafts. Backups 204-1 to 204-4 are cylindrical and minimize the contact surface with the rollers, so as not to impede the rotation of the rollers. Backup 204-1 is a roller that suppresses the horizontal movement of roller 201-1. Backup 204-2 is a roller that suppresses the downward movement of roller 201-1. Backup 204-3 is a roller that suppresses the downward movement of roller 201-2. Backup 204-4 is a roller that suppresses the horizontal movement of roller 201-2.

[0041] The guides 205-1 and 205-2 are guides provided with grooves that are approximately 1 / 3 the thickness of the test piece 21. The guides 205-1 and 205-2 are arranged so that the bottom surfaces of the grooves are at the same height as the upper surfaces of the rollers 201-1 and 201-2. The guides 205-1 and 205-2 are also arranged so that both ends of the test piece 21 are located on the guides 205-1 and 205-2 when the test piece 21 is placed on the upper surfaces of the rollers 201-1 and 201-2. When the test piece 21 starts to bend, the test piece 21 leaves the grooves of the guides 205-1 and 205-2, but this does not pose a problem because the test piece 21 is difficult to move in the depth direction while it is sandwiched between the bending punch 231 and the rollers 201-1 and 201-2.

[0042] In this way, according to the testing device of the second embodiment, the punch is supported from a direction intersecting the width direction of the punch, thereby making it possible to prevent buckling during the initial pressing stage.

[0043] The present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate without departing from the spirit of the present invention. For example, in the first embodiment, the rollers 101-1 and 101-2 have grooves on the side surface of the cylinder that are approximately 1 / 3 the thickness of the test piece 21, but the depth and shape of the grooves may be modified as appropriate to match the shape of the test piece. [Explanation of symbols]

[0044] 11, 12, 101-1, 101-2, 201-1, 201-2 Laura 13 Punch 21 Test Pieces 100, 200 Test Equipment 102-1, 102-2, 202-1, 202-2 Bearings 103, 203 Insertion member 104-1~104-4, 204-1~204-4 Backup 131, 231 Bending punch 133, 233 Device connection 205-1, 205-2 Guide

Claims

[Claim 1] A pair of rollers spaced apart from each other and having parallel rotation axes; a pushing member that is provided between the pair of rollers so as to be movable in and out and pushes the test sample placed on the rollers into the gap between the pair of rollers at a predetermined speed; A load measuring means for measuring a load applied to the pushing member; A first backup roller that suppresses horizontal movement of the pair of rollers; a second backup roller that suppresses downward movement of the pair of rollers; A test device having a grooved guide, The pushing member is a punch having a predetermined width and configured to press the sample to be measured; A punch support that prevents deformation of the punch in a direction intersecting the width direction of the punch, A testing apparatus, wherein the guides are positioned such that, when a test piece is placed on the upper surfaces of the pair of rollers, both ends of the test piece are positioned in the guides.

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