Fixture

Abstract

The present invention provides a clamp for clamping a sample having a clamped portion and a stretched portion to perform a tensile strength test on the connecting portion, wherein the clamped portion and the stretched portion are connected to each other at an angle, wherein the clamp comprises: a pressing plate; a connecting member, wherein the connecting member comprises a fixing portion for fixing the clamp to a tensile testing device; and two side members, wherein the two side members are arranged facing each other, wherein one end of the side member is connected to the connecting member, and the other end of the side member is connected to the pressing plate to form a receiving space for receiving the clamped portion of the sample, and the side member is provided with a restraining portion for holding the clamped portion of the sample.

Description

Technical Field

[0001] The invention relates to a clamp, in particular to a clamp capable of clamping a sample with a corner portion in the cross section and performing a tensile test. Background Art

[0002] In mass-produced welded products such as vehicle shells, the quality of the weld seam often directly affects the performance of the product. In the past, in order to verify the quality of the weld seam, a tensile test was usually performed as follows: two thin plate-shaped specimens of specified dimensions were prepared in advance and partially overlapped and welded, and then the specimens were clamped and stretched using the clamps of the tensile test device to evaluate the quality of the weld seam.

[0003] However, in the above-mentioned conventional tensile tests, it is impossible to test products with angled welds, and it is necessary to prepare thin plate-shaped specimens separately using materials corresponding to the products for tensile testing, and it is impossible to test specimens with specific structures (for example, the cross section has corners) cut directly from mass-produced products. This not only increases the cost due to the special preparation of specimens, but also, since the welding performance of the specimen material can only be verified in the early stage without the actual product, it is impossible to conduct a later inspection of the welds, etc. in the actual mass-produced products, and therefore, it is impossible to accurately evaluate the mechanical properties of the welds, etc. in the actual products.

[0004] In addition, it is expected that the welding performance of a plurality of test specimens having different cross-sectional shapes, which are directly cut from different parts of the product to be tested, can be tested easily using the same fixture. Summary of the invention

[0005] The present invention is made to solve at least any one of the above problems, and one object of the present invention is to provide a clamp that can clamp a sample having a corner portion in its cross section and that is easy to operate.

[0006] (1) In order to achieve the above-mentioned purpose, the present invention provides a clamp for clamping a specimen having a clamped portion and a stretched portion to perform a tensile strength test on the connecting portion, wherein the clamped portion and the stretched portion are connected to each other at an angle, wherein the clamp comprises: a pressing plate; a connecting member, wherein the connecting member comprises a fixing portion for fixing the clamp to a tensile testing device; and two side members, wherein the two side members are arranged facing each other, wherein one end of the side member is connected to the connecting member, and the other end of the side member is connected to the pressing plate to form a receiving space for receiving the clamped portion of the specimen, and the side member is provided with a restraining portion for holding the clamped portion of the specimen.

[0007] (2) In the clamp of the above-mentioned aspect (1), preferably, one end of the side member is detachably connected to the connecting member, and the restraining portion clamps the clamped portion of the sample together with the pressing plate.

[0008] (3) In the clamp of the above-mentioned scheme (2), preferably, one end of the side member is provided with a sample side slot or a sample side clamp, and the connecting member is correspondingly provided with a fixed side clamp embedded in the sample side slot or a fixed side slot for the sample side clamp to be embedded.

[0009] (4) In the clamp of the above-mentioned scheme (3), preferably, the sample side groove is provided at one end of the side member, the sample side groove is a T-shaped groove, the connecting member is a T-shaped member, the fixing portion is the web of the T-shaped member, and the fixing side clamp is the flange of the T-shaped member.

[0010] (5) In the clamp of any one of the above (1) to (4), preferably, the restraining portion includes at least one restraining pin, and the at least one restraining pin is provided on surfaces of the two side members that face each other on the other end side.

[0011] (6) In the clamp of any of the above schemes (1) to (4), it is preferred that at least one threaded hole is formed on the end face of the other end of the side member, a through hole is formed on the pressure plate corresponding to the threaded hole, the pressure plate is fastened to the side member by bolts, and / or a positioning pin is provided on the pressure plate, and a pin receiving hole is provided on the end face of the other end of the side member accordingly.

[0012] (7) In the fixture of the above-mentioned solution (4), preferably, one side surface of the pressing plate is configured as a positioning surface for positioning the test specimen, and the positioning surface is flush with the web surface of the test connection member.

[0013] (8) In the clamp of the above-mentioned aspect (4), preferably, boss portions are formed on surfaces of the side members facing each other on the one end side, and the T-slot passes through the boss portions.

[0014] (9) In the jig of the above-mentioned embodiment (4), preferably, a marking portion is formed on the web of the T-shaped member, and / or a knurled portion is formed on the web of the T-shaped member.

[0015] (10) In the clamp of any one of the above (1) to (4), it is preferred that the angle between the clamped portion and the stretched portion is in the range of 70° to 110°.

[0016] (11) In the clamp of the above-mentioned aspect (10), preferably, the angle between the clamped portion and the stretched portion is 90°.

[0017] According to the clamp of the present invention, the clamped portion of the sample having a corner section can be held by the restraining portion provided on the side member, and the clamp and the sample can be fixed to the tensile test device by connecting the connecting member fixed to the tensile test device with one end of the two side members. In particular, in the process of performing tensile tests on a series of samples having corner sections, when the sample is replaced for testing, it is not necessary to remove the fixing portion of the connecting member (for example, the web of the T-shaped member) from the tensile test device. The assembly of the clamp and the replaced sample can be completed by simply connecting the connecting member fixed to the tensile test device with one end of the two side members while holding the replaced sample by the restraining portion of the side member. Therefore, when testing multiple samples, the labor of disassembling and assembling the connecting member can be saved and the operation can be simplified. Therefore, a clamp that can clamp the sample having a corner section and is easy to operate can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded perspective view showing a clamp according to one embodiment of the present invention.

[0019] Figure 2 Schematic diagram showing test pieces having different cross-sectional shapes cut from different parts of a vehicle body lower shell as a product to be tested.

[0020] Figure 3 (a) to (f) are schematic diagrams schematically showing the steps of assembling a sample using a jig according to one embodiment of the present invention.

[0021] Figure 4 It is schematically shown by Figure 3 (f) is a side sectional view of the cross section in the middle of the two side members. DETAILED DESCRIPTION

[0022] Hereinafter, with reference to the accompanying drawings, suitable embodiments of the present invention will be described. However, the following embodiments are merely illustrative of preferred structures of the present invention, and the scope of the present invention is not limited to these structures. The dimensions, materials, shapes, and relative arrangements of the structural components described in the embodiments are not intended to limit the scope of the present invention to these unless otherwise specified.

[0023] In addition, in all the drawings, the same reference numerals represent the same elements. In the drawings, the dimensions of certain features may be deformed for clarity. In addition, all terms (including technical terms and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, well-known functions or structures may not be described in detail.

[0024] In addition, the singular forms "a", "the" and "the" used in the specification include plural forms unless clearly indicated. The terms "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the relevant listed items.

[0025] Additionally, in the specification, spatial relational terms such as "upper", "lower", "left", "right", "front", "back", "higher", "lower", etc. may describe the relationship of one feature to another feature in the drawings. It should be understood that the spatial relational terms include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, when the device in the drawings is turned over, features that were previously described as being "below" other features may now be described as being "above" the other features. The device may also be oriented in other ways (rotated 90 degrees or in other orientations), and the relative spatial relationships will be interpreted accordingly.

[0026] Figure 1 FIG. 1 is an exploded perspective view showing a clamp 100 according to an embodiment of the present invention. Figure 1 As shown, the clamp 100 of this embodiment has two side members 10, a pressure plate 20 and a connecting member 30, wherein the connecting member 30 is, for example, a T-shaped member having a T-shaped cross section (hereinafter, the connecting member 30 is also referred to as the T-shaped member 30). The clamp 100 is used to clamp a sample cut directly from a profile to be tested (e.g., a mass-produced product such as a vehicle body lower shell), wherein the cross section of the sample has a corner (e.g., a substantially right-angled corner). Specifically, the sample has a clamped portion and a flat-plate-shaped stretched portion, wherein the clamped portion and the stretched portion are connected to each other at an angle (e.g., the angle formed by the planes connected to each other is a right angle or close to a right angle). Details of the sample will be described later.

[0027] In the clamp 100 of this embodiment, the two side members 10 are disposed facing each other, and together with the pressing plate 20, form a receiving space for receiving the clamped portion of the sample. Figure 1The lower part of the two side members 10 is provided with a T-slot 11, and the T-slot 11 is used for the T-shaped member 30 to be embedded, so as to fix the two side members 10 (specimens) to the tensile test device. Figure 1 Boss portions 13 are respectively formed at the surfaces facing each other on the sides of the two side members 10 (lower part in the middle), and the T-slots 11 pass through the boss portions 13. By providing the boss portions 13 on the two side members 10, the depth dimension of the T-slot 11 is increased, so that the T-member 30 can be more reliably embedded in the T-slot 11. In addition, by forming a storage space for accommodating the sample in a state where the boss portions 13 of the two side members 10 are butted against each other, when the pressure plate 20 described later is installed on the two side members 10, the outer side portions of the two side members 10 where the boss portions 13 are formed can be directly grasped for installation, which can make the installation operation more convenient. In addition, the boss portion 13 can be formed integrally on the side member 10, or can be separately provided on the side member 10 by insertion or the like, or the boss portion 13 can be omitted.

[0028] In addition, the two side members 10 are respectively provided with a restraining portion capable of holding the clamped portion of the sample. Specifically, at the other end portions (for example, Figure 1 At least one restraining pin 12 is respectively provided at the mutually facing surfaces of the two side members 10 (upper part in the middle), and the restraining pin 12 can be used to hold the sample. In the present embodiment, the case where two restraining pins 12 are respectively provided on the two side members 10 is illustrated for explanation, but the shape and number of the restraining pins 12 can be changed as needed. In addition, the restraining pin 12 can be formed integrally on the side member 10, or an insertion hole can be formed in advance on the side member 10 and the restraining pin 12 can be separately provided on the side member 10 by inserting or threading. In the case of being separately provided on the side member 10, the distance between the restraining pins 12 provided on the same side member 10 can be adjusted according to the position of the insertion hole of the side member 10. In addition, it is also possible that the restraining pin 12 is provided only on one side member 10 and the restraining pin 12 is not provided on the other side member 10. In addition, when two or more restraining pins 12 are respectively provided on the two side members 10, it is possible to effectively prevent the sample held by the restraining pin 12 from flipping during the stretching process.

[0029] In addition, at the other end portions of the two side members 10 (eg Figure 1 At least one threaded hole 14 (two are shown in this example) is formed on the end surface of each of the upper parts in the middle. As described later, the threaded hole 14 is used to fix the pressure plate 20.

[0030] In the clamp 100 of the present embodiment, the pressing plate 20 is formed in a substantially rectangular shape, but the shape of the pressing plate 20 is not limited thereto. The pressing plate 20 may also be in a polygonal shape such as a trapezoid, a circle, or the like. Figure 1 The clamped portion of the sample received and held between the two side members 10 is clamped by the upper portion of the pressing plate 20. Specifically, a plurality of through holes 21 are formed at both side ends of the pressing plate 20 corresponding to the threaded holes 14 provided on the two side members 10. The bolts 22 are passed through the plurality of through holes 21 and are threadedly fastened to the threaded holes 14 while the sample is held between the two side members 10. Thus, the pressing plate 20 is fixed to the two side members 10, and the sample held between the two side members 10 is clamped by the outer surface of the pressing plate 20, thereby achieving the fastening of the sample to be tested.

[0031] In the jig 100 of this embodiment, the T-shaped member 30 as the connecting member has a clamp 1A (see below) for a tensile test device. Figure 3 ) and the flanges 32 embedded in the T-slots 11 of the two side members 10. The flanges 32 are embedded in the T-slots 11 of the two side members 10 while the web 31 of the T-member 30 is fixed to the clamp 1A of the tensile test device, thereby fixing the two side members 10 (specimens) to the tensile test device.

[0032] In addition, a positioning mark (not shown) is formed on the web 31 of the T-shaped member 30, and by aligning the clamp 1A of the tensile tester with the positioning mark on the web 31, the clamp 1A can easily clamp the center portion in the width direction of the web 31. In addition, a knurled portion is formed on the web 31 of the T-shaped member 30, so that the clamp 1A of the tensile tester can clamp the web 31 more firmly and perform tension during the test.

[0033] Next, the sample in this embodiment is described. Figure 2 Schematic diagram showing a plurality of test specimens cut from different parts of the lower body shell of the vehicle body as the product to be tested. Figure 2 Schematically showing six kinds of samples G1 to G6 with different cross-sectional shapes, the samples G1 to G6 are directly obtained by cutting a predetermined length (e.g., 40 mm) at different locations of the vehicle body lower shell as an actual product according to the jig 100 of this embodiment and removing unnecessary structures such as brackets. In this embodiment, the vehicle body lower shell is formed of a metal material such as aluminum.

[0034] like Figure 2As shown, the specimens G1 to G6 respectively have clamped portions GA1 to GA6 and flat-plate stretched portions GB1 to GB6. The clamped portions GA1 to GA6 are portions held and clamped by the fixture 100. The flat-plate stretched portions GB1 to GB6 are clamped by the clamp 1B of the tensile test device as tensile ends (see the following description). Figure 3 ). The reference numerals H1 to H6 (parts indicated by black dots in the figure) schematically show the connection parts (welds) which are the welding locations of the clamped parts GA1 to GA6 and the stretched parts GB1 to GB6. In each specimen, the angle formed by the planes where the clamped parts GA1 to GA6 and the flat-plate-shaped stretched parts GB1 to GB6 meet each other is about 90°, that is, the cross-sectional shapes of the specimens G1 to G6 all have substantially right-angled corners. In addition, a cavity is formed in the clamped parts GA1 to GA6 of each specimen G1 to G6, and the specimen is held by inserting the restraining pins 12 of the two side members 10 into the cavity of the clamped part of the specimen. Here, the thickness of the wall of the cavity is, for example, 3 mm to 4.5 mm.

[0035] Hereinafter, the procedure of assembling the sample to the jig 100 of the present embodiment will be described by taking the sample G1 as an example. The assembling procedure described for the sample G1 is also applicable to each of the samples G2 to G6.

[0036] Figure 3 (a) to (f) are schematic diagrams schematically showing the steps of assembling the sample G1 using the jig 100 of this embodiment. Figure 3 The positional relationship of the clamps 1A, 1B, fixture 100 and sample G1 of the tensile test device shown in the figure is not completely consistent with the actual situation. The clamps 1A, 1B, fixture 100 and sample G1 of the tensile test device can be arranged in the vertical direction for tensile testing, or in the horizontal direction for tensile testing. Here, the case where the clamps 1A, 1B, fixture 100 and sample G1 of the tensile test device are arranged in the horizontal direction is used as an example for description.

[0037] First, if Figure 3 As shown in (a), the web 31 of the T-shaped member 30 in the fixture 100 is fixed to the clamp 1A of the tensile testing device.

[0038] Then, if Figure 3As shown in (b) and (c), the restraining pins 12 (restraining parts) formed on the two side members 10 are respectively inserted into the cavities of the clamped part GA1 of the sample G1, and the two side members 10 are used to form a receiving space for receiving the clamped part GA1 of the sample G1, and the sample G1 is held. At this time, the outer surface of the wall of the cavity of the clamped part GA1 can be roughly parallel to the end faces of the two side members 10, and the outer surface of the wall of the cavity can be slightly protruded compared with the end faces of the two side members 10.

[0039] Then, if Figure 3 As shown in (d), the bolts 22 are passed through the through holes 21 of the pressing plate 20 and are screwed and fastened to the screw holes 14 formed on the end faces of the two side members 10, thereby fastening the pressing plate 20 to the two side members 10 and clamping the clamped portion GA1 of the sample G1 by the outer surface of the pressing plate 20 and the restraining pins 12 of the side members 10, thereby fastening the sample G1. At this time, the flat-plate-shaped stretched portion GB1 of the sample G1 extends outside the accommodation space formed by the two side members 10 and becomes the stretched end clamped by the clamp 1B of the tensile test device.

[0040] In addition, it should be noted that the surface of the pressing plate 20 parallel to the flat plate-shaped stretched portion GB1 of the sample G1 is the positioning surface W (see the following description). Figure 4 ), before tightening the bolt 22, the stretched portion GB1 of the sample G1 is brought into contact with the positioning surface W, thereby positioning the sample G1.

[0041] In addition, here, the case where the wall thickness of the cavity of the clamped part GA1 is 3mm to 4.5mm and the outer surface of the wall slightly protrudes from the end surface of the side member 10 is explained as an example, but even if the wall thickness of the cavity is greater than 4.5mm and the outer surface of the wall further protrudes from the end surface of the side member 10, the height of the outer surface of the pressure plate 20 can be adjusted by adjusting the size of the threaded hole 14 of the side member 10 through which the bolt 22 is screwed, so that the clamped part GA1 of the specimen G1 can be tightened using the outer surface of the pressure plate 20 and the restraining pin 12.

[0042] Then, if Figure 3 As shown in (e), with the web 31 of the T-shaped member 30 being clamped by the clamp 1A of the tensile tester, the flange 32 of the T-shaped member 30 is fitted into the T-slots 11 of the two side members 10. Thus, the jig 100 with the sample G1 fixed thereto is mounted on the tensile tester.

[0043] Finally, if Figure 3As shown in (f), the clamp 1B of the tensile test device is used to clamp the stretched part GB1 of the sample G1. At this point, the assembly of the sample G1 is completed and the tensile test is started. The welding performance test is performed on the weld H1 at the connection between the clamped part GA1 and the stretched part GB1 in the sample G1.

[0044] Figure 4 It is schematically shown by Figure 3 (f) is a side cross-sectional view of the central section of the two side members 10. Figure 4 As shown, when the stretched portion GB1 of the sample G1 is abutted against the positioning surface W of the pressing plate 20 and the sample G1 is fixed to the fixture 100, the lower surface GS1 of the stretched portion GB1 of the sample G1, the positioning surface W of the pressing plate 20 and the surface 30S of the web 31 of the T-shaped member 30 are substantially flush, that is, located in the same plane. Thus, the measurement accuracy in the tensile test can be further improved.

[0045] In addition, in the welding strength tensile test conducted on the lower shell of the vehicle body, when another sample (any one of the samples G1 to G6, such as the sample G2) is tested after the tensile test of the above-mentioned sample G1 is completed, first, the flange 32 of the T-shaped member 30 is removed from the T-shaped slot 11 of the two side members 10, and the two side members 10, the pressure plate 20 and the sample G1 are removed from the tensile test device. Then, after the bolts 22, the pressure plate 20 and the sample G1 are removed in sequence, the sample G2 to be tested is replaced and the same test is repeated. Figure 3 The same steps as those for assembling the sample G1 are performed as shown in (a) to (f), the sample G2 is assembled and the tensile test is started, and the welding performance test is performed on the weld at the plane where the clamped portion GA2 and the tensile portion GB2 of the sample G2 meet each other.

[0046] Thus, according to the jig 100 of the present embodiment, a plurality of samples with different cross-sectional shapes cut directly from different parts of the vehicle body lower shell can be subjected to tensile testing. Since there is no need to prepare a plurality of specific jigs for the plurality of samples with different cross-sectional shapes cut from the same product, and there is no need to prepare thin plate-shaped samples for tensile testing using materials corresponding to the product as in the past, the cost of measuring the welding strength of different parts of actual products such as the vehicle body lower shell can be reduced. In addition, since the sample clamped by the jig 100 of the present embodiment can be directly cut from an actual product such as the vehicle body lower shell, the welds and the like in the actual mass-produced products such as the vehicle body lower shell can be later inspected, and the mechanical properties of the welds and the like in the products such as the vehicle body lower shell can be accurately evaluated.

[0047] In addition, during the process of disassembling and / or replacing the specimens G1 to G6, the web 31 of the T-shaped member 30 is always clamped by the clamp 1A of the tensile testing device (i.e., the T-shaped member 30 is always fixed to the tensile testing device). The assembly of the fixture and the replaced specimen can be completed only by clamping and fixing any of the specimens G1 to G6 by using the two side members 10 and the pressure plate 20, and then embedding the T-shaped member 30 fixed to the tensile testing device into the T-slots 11 of the two side members.

[0048] Therefore, according to the fixture 100 of this embodiment, when disassembling and / or replacing multiple different specimens for testing, the labor of disassembling and assembling the T-shaped component 11 can be saved and the operation can be simplified. In addition, the installation error caused by disassembling and assembling the T-shaped component 11 can be avoided, thereby further improving the accuracy of the test results.

[0049] In addition, according to the fixture 100 of this embodiment, since during the tensile test of the specimen (for example, specimen G1), the lower surface GS1 of the stretched portion GB1 of the specimen G1, the positioning surface W of the pressure plate 20, and the surface 30S of the web 31 of the T-shaped member 30 are located in the same plane, the accuracy of the test results can be further improved.

[0050] In addition, according to the clamp 100 of the present embodiment, since the web 31 of the mutually parallel T-shaped member 30 and the stretched portions GB1 to GB6 of the specimens G1 to G6 are used as the stretching portions to be clamped and stretched by the clamps 1A and 1B of the stretching test device, the clamp 100 of the present embodiment is universal with respect to different types of stretching test devices.

[0051] Furthermore, the above description has been given of a case where the jig 100 of this embodiment is used to measure the welding strength of a weld in a sample, but the jig 100 of this embodiment can also be used to measure the connection strength between components connected to each other by bonding, snap-fitting, etc. in a sample.

[0052] In addition, the clamp 100 of the present embodiment may be formed of a material that meets the hardness requirement, such as stainless steel, but preferably, the clamp 100 is formed of 45-grade steel, thereby reducing the manufacturing cost of the clamp 100 .

[0053] In addition, the above description is for the case where the angle between the clamped portion and the stretched portion of the samples G1 to G6 is about 90°, but the present invention is not limited thereto. When the angle between the clamped portion and the stretched portion of the sample is within the range of 70° to 110°, the position and angle of the clamped portion or the stretched portion of the sample can be adjusted, so that the sample can be held by the clamp 100 of the present embodiment and the tensile test can be performed.

[0054] In addition, in the clamp 100 of the present embodiment, the pressing plate 20 may be provided with a positioning pin, and the other end portions (for example, Figure 1 Thus, when the pressure plate 20 is fixed to the two side members 10, the bolts 22 are screwed together with the threaded holes 14 of the side members 10 after the positioning pins are inserted into the pin receiving holes, so that the bolts 22 can be tightened more smoothly, which can make the operation easier.

[0055] In addition, in the above-mentioned embodiment, the clamped parts GA1 to GA6 of the specimens G1 to G6 have cavities into which the restraining pins 12 formed on the two side members 10 can be inserted, but the clamped parts of the specimens may be plate-shaped without cavities. In this case, the restraining pins 12 formed on the two side members 10 may be brought into contact with the plate-shaped clamped parts of the specimens and fastened using the pressing plate 20.

[0056] In addition, in the above-mentioned embodiment, the structure in which the connecting member 30 is a T-shaped member and its web 31 is used as a fixing portion fixed to the tensile test device, its flange 32 is used as a fixed side clamp engaged with the two side members 10, and the T-shaped groove 11 provided on the two side members 10 is used as a sample side clamp groove is described, but it is not limited to this. In the clamp 100 of the present embodiment, the connecting member 30 may also be a member having other cross-sectional shapes such as L-shaped and J-shaped. In this case, the two side members 10 are formed with corresponding clamp grooves for the connecting member 30 to be engaged. In addition, the sample side clamps may be formed at the ends of the two side members 10, and the connecting member 30 may be formed with corresponding fixed side clamp grooves for engaging the sample side clamps of the side members 10. That is to say, as long as it is a structure that can realize the interlocking of the connecting member 30 with the two side members 10 fixed with the sample, it can be a structure in which a sample side slot is provided at one end of the two side members 10 and the connecting member 30 has a corresponding fixed side clamp, or it can be a structure in which a sample side clamp is provided at one end of the two side members 10 and the connecting member 30 has a corresponding fixed side slot. In addition, the fixing portion of the connecting member 30 is not limited to the flat web 31, as long as it can be a structure that can be fixed to the tensile test device or clamped by the clamp of the tensile test device. In addition, the connection between the connecting member 30 and the two side members 10 is not limited to the method based on the above-mentioned slot and clamp, and can also be the following structure, etc.: a threaded protrusion is formed at one end of a single side member 10, and a threaded hole is correspondingly formed in the connecting member 30, and the threaded protrusion is screwed into the threaded hole, thereby realizing the connection between the connecting member 30 and the two side members 10. In other words, as long as it is a structure that can connect the connecting member 30 to the two side members 10.

[0057] In addition, in the above-mentioned embodiment, the case where the restraining portion provided on the side member 10 is a restraining pin 12 is described, but it is not limited to this. The restraining portion of the side member 10 may also be a structure such as a support plate, a slot, etc. provided on one or both of the two side members 10 to hold the clamped portion of the sample. In other words, the restraining portion of the two side members 10 only needs to be a structure that can hold the clamped portion of the sample. However, in the case of using the restraining pin 12 to hold the clamped portion of the sample, it is easier to use the fixture 100 to deal with multiple samples with different cross-sectional shapes cut from the product, thereby reducing the test cost when testing the welding parts of the product.

[0058] In addition, in the above-mentioned embodiment, a structure in which a through hole 21 is formed on the pressing plate 20 and the pressing plate 20 is fixed to the threaded holes 14 of the two side members 10 by bolts 22, and the clamped portion of the sample is clamped by the pressing plate 20 is described, but it is not limited to this. The pressing plate 20 can also be connected to the two side members 10 by interference fit, snap fit, pin connection, etc., and together with the two side members 10, a receiving space for receiving the clamped portion of the sample is formed. Preferably, the pressing plate 20 is a structure that can clamp the clamped portion of the sample received and held between the two side members 10. In the case of a structure in which the pressing plate 20 is fixed to the threaded holes 14 of the two side members 10 by bolts 22, the reliability of the clamp 100 during the tensile test can be more easily ensured.

[0059] Although exemplary embodiments of the present invention have been described, it will be appreciated by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present invention without departing substantially from the spirit and scope of the present invention. Therefore, all changes and modifications are included within the scope of protection of the present invention as defined by the claims. The present invention is defined by the appended claims, and the equivalents of these claims are also included.

Claims

1. A clamp for clamping a sample having a clamped portion and a stretched portion to perform a tensile strength test on the connecting portion, wherein the clamped portion and the stretched portion are connected to each other at an angle, wherein: The fixture comprises: Press plate; a connecting member, the connecting member comprising a fixing portion for fixing the clamp to a tensile testing device; and Two side members, the two side members are arranged facing each other, wherein one end of the side member is connected to the connecting member, and the other end of the side member is connected to the pressing plate to form a receiving space for receiving the clamped portion of the sample, and the side member is provided with a restraining portion for holding the clamped portion of the sample, A cavity is formed in the clamped portion of the sample, and the restraining portions provided on the side members are respectively inserted into the cavity of the clamped portion. The outer surface of the wall of the cavity of the clamped portion protrudes compared to the end surface of the side member, the outer surface of the pressing plate abuts against the outer surface of the wall of the cavity and clamps the clamped portion of the sample together with the restraining portion of the side member. One end of the side member is detachably connected to the connecting member, Boss portions are respectively provided on surfaces of the two side members that face each other, and the accommodation space for accommodating the sample is formed in a state where the boss portions of the two side members are butted against each other.

2. The clamp according to claim 1, wherein: One end of the side member is provided with a sample side slot or a sample side clamp. The connecting member is correspondingly provided with a fixed side clamp embedded in the sample side clamping groove or a fixed side clamping groove for the sample side clamp to be embedded in.

3. The clamp according to claim 2, wherein: The sample side slot is provided at one end of the side member, and the sample side slot is a T-shaped slot. The connecting member is a T-shaped member, the fixing portion is a web of the T-shaped member, and the fixing side clamp is a flange of the T-shaped member.

4. The clamp according to any one of claims 1 to 3, wherein: The restraining portion includes at least one restraining pin provided on surfaces of the two side members facing each other on the other end side.

5. The clamp according to any one of claims 1 to 3, wherein: At least one threaded hole is formed on the end surface of the other end of the side member, and a through hole is formed on the pressure plate corresponding to the threaded hole. The pressure plate is fastened to the side member by bolts, and / or, The pressure plate is provided with a positioning pin, and the end surface of the other end portion of the side member is correspondingly provided with a pin receiving hole.

6. The clamp according to claim 3, wherein: One side surface of the pressing plate is configured as a positioning surface for positioning the test specimen, and the positioning surface is flush with a web surface of the connecting component.

7. The clamp according to claim 3, wherein: The boss portions are respectively formed on surfaces of the side members that face each other on the one end side, and the T-shaped grooves penetrate the boss portions.

8. The clamp according to claim 3, wherein: A marking portion is formed on the web of the T-shaped member, and / or, A knurled portion is formed on the web of the T-shaped member.

9. The clamp according to any one of claims 1 to 3, wherein: The angle between the clamped portion and the stretched portion is in the range of 70° to 110°.

10. The clamp according to claim 9, wherein: The angle between the clamped portion and the stretched portion is 90°.

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