Method and tool for testing riveting performance of metal plate

Abstract

The invention provides a method and tool for testing riveting performance of a metal plate, and the method comprises the steps: 1, carrying out the finite element analysis of the riveting of a to-be-tested plate and an auxiliary plate, and obtaining the deformation of the to-be-tested plate in the thickness direction; 2, placing a top block and a punch on two sides of the to-be-detected plate, and enabling the top block and the punch to abut against the end faces of two sides of the to-be-detected plate respectively; and step 3, according to the deformation quantity of the to-be-detected plate in the thickness direction, punching the to-be-detected plate in the direction of the top block by using a punch, obtaining the deformation condition of the to-be-detected plate, and judging the riveting performance of the to-be-detected plate according to the deformation condition. According to the technical scheme, the problem that in the prior art, riveting performance testing is tedious can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of riveting testing, and in particular to a testing method and a testing tool for the riveting performance of metal plates. Background Art

[0002] At present, in industries such as aerospace, automobile manufacturing, construction and shipbuilding, piercing riveting is often used to connect two or more workpieces when connecting metal sheets. Piercing riveting does not require the use of prefabricated rivets. During the piercing riveting process, a tubular punch is usually used to punch into the sheet. During the punching process, the punch and the sheet will deform, so that these sheets are connected to each other.

[0003] However, when the punch penetrates the plate, a circular bulge will be formed on the side of the plate away from the punch. Since the content of each element in different plates is different, the mechanical properties of the plates will also be different. During the deformation of the bulge of the stamped plate, the bulge will produce different numbers of cracks in the transverse and radial directions, affecting the connection effect of the plate. In the prior art, in order to ensure the connection effect and connection quality of the plate, an auxiliary plate is usually used to conduct a matching test with a plate to be tested, and the auxiliary plate and the plate to be tested are actually riveted to determine the damage of the plate to be tested after the bulge is formed. This test method requires riveting two plates, and multiple tests are performed on plates with multiple element contents according to different riveting depths. The overall process is relatively cumbersome. Summary of the invention

[0004] The invention provides a method and a tool for testing the riveting performance of a metal plate, so as to solve the problem that the riveting performance test in the prior art is relatively complicated.

[0005] According to one aspect of the present invention, a method for testing the riveting performance of a metal plate is provided, and the testing method comprises: step one: performing finite element analysis on the riveting between a plate to be tested and an auxiliary plate to obtain the deformation amount of the plate to be tested in the thickness direction; step two: placing a top block and a punch on both sides of the plate to be tested, so that the top block and the punch are respectively abutted against the end faces on both sides of the plate to be tested; step three: according to the deformation amount of the plate to be tested in the thickness direction, using the punch to punch the plate to be tested in the direction of the top block to obtain the deformation condition of the plate to be tested, and judging the riveting performance of the plate to be tested according to the deformation condition.

[0006] By applying the technical solution of the present invention, the riveting process of the auxiliary plate and the plate to be tested can be simulated in the finite element analysis software to simulate the punching depth of the rivet in the thickness direction of the plate to be tested. And according to the punching depth of the plate to be tested after the riveting is completed, the displacement of the punch in the actual simulation punching test process is determined. After the punch punching is completed, the riveting performance of the plate to be tested can be judged according to the deformation of the plate to be tested, that is, the number of radial cracks and transverse cracks generated by the convex hull of the plate to be tested. In the above-mentioned test method, because the riveting result of the auxiliary plate and the plate to be tested is first obtained in the finite element analysis software, the deformation of the plate to be tested can be simulated. In this way, in the actual simulation test process, the auxiliary plate can be used for testing. The punch only punches a single plate to be tested to make the plate to be tested produce a deformation amount after riveting, and the deformation of the plate to be tested after riveting is completed can be obtained, which reduces the material loss in the simulation process, saves the tediousness of the traditional double-plate test, and simplifies the test process.

[0007] Furthermore, in step one, the deformation amount of the plate to be tested in the thickness direction includes a first deformation amount and a second deformation amount, the first deformation amount is the deformation amount of the plate to be tested in the thickness direction when the auxiliary plate is pierced; the second deformation amount is the deformation amount of the plate to be tested in the thickness direction after riveting is completed, and step three specifically includes: selecting multiple test values ​​between the first deformation amount and the second deformation amount, and punching the plate to be tested multiple times according to different test values ​​to obtain the deformation conditions under different test values, and judging the riveting performance of the plate to be tested according to the deformation conditions.

[0008] Furthermore, the deformation amount of the plate to be measured in the thickness direction also includes a third deformation amount, and the third deformation amount is greater than the second deformation amount. Step three also includes selecting the third deformation amount to punch the plate to be measured.

[0009] Furthermore, step three specifically includes: adjusting the punching speed of the punch according to the deformation amount of the plate to be tested in the thickness direction, punching the plate to be tested multiple times to obtain the deformation conditions corresponding to different punching speeds under the same deformation amount, and judging the riveting performance of the plate to be tested according to the deformation conditions.

[0010] According to another aspect of the present invention, a testing tool for the riveting performance of metal plates is provided, the testing tool is tested using the above-mentioned testing method, and the testing tool comprises: a base, the upper surface of the base is used to place the plate to be tested, the upper surface of the base has a receiving groove, a top block is arranged in the receiving groove, and the top of the top block is in the same plane as the upper surface of the base; a punch, the punch has a stamping end and a connecting end arranged oppositely, the stamping end has a stamping hole, the stamping hole is arranged corresponding to the top block, and the connecting end is used to connect with a driving member to drive the punch to move toward the top block; a limit member is arranged between the punch and the base, the limit member is used to adjust the distance that the punch moves toward the top block.

[0011] Furthermore, the limiting member includes a limiting block, the punch includes a stamping part and a connecting part connected to each other, the end of the stamping part away from the connecting part forms a stamping end, the diameter of the stamping part is smaller than the diameter of the connecting part, the connecting part has a step surface on the side facing the stamping part, and a limiting block is arranged between the step surface and the base.

[0012] Furthermore, a first threaded section is provided on a side of the stamping portion away from the stamping end, and a first screw hole is provided on an end of the connecting portion close to the stamping portion, and the first threaded section is threadably matched with the first screw hole.

[0013] Furthermore, a cover plate is provided on the base, and the cover plate is detachably provided on the upper surface of the base, the plate to be tested is placed between the cover plate and the base, and a through hole is provided on the cover plate, and the through hole is used for the punch to pass through.

[0014] Furthermore, the punching hole has a conical section and a straight section that are interconnected, the conical section is arranged on a side of the straight section away from the connecting end, and the inner diameter of the conical section gradually increases in a direction from the connecting end to the punching end.

[0015] Furthermore, an included angle is formed between the inner wall of the tapered section and the axis of the punch, and the included angle is between 15° and 40°.

[0016] When using the test tool of the present application, the driving member can drive the punch to move toward the top block to punch the plate to be tested for riveting test. The limiter can limit the distance the punch moves, so that the punch can accurately punch according to the deformation obtained by finite element analysis simulation, thereby ensuring the test results and test accuracy of the test tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of the test tool provided by the present invention is shown;

[0019] Figure 2 Shows Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 It shows the deformation of the plate to be tested when the auxiliary plate is pierced when the finite element analysis is performed by the test method provided by the present invention;

[0021] Figure 4 The figure shows the deformation of the plate to be tested when the finite element analysis is performed using the test method provided by the present invention and when riveting is completed.

[0022] The above drawings include the following reference numerals:

[0023] 01. The board to be tested;

[0024] 100, top block;

[0025] 200, punch; 201, stamping portion; 202, connecting portion; 210, stamping hole; 211, tapered section; 212, straight section;

[0026] 300, base;

[0027] 400, limit block;

[0028] 500, cover plate; 510, through hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] An embodiment of the present invention provides a method for testing the riveting performance of a metal sheet, the testing method comprising:

[0031] Step 1: Perform finite element analysis on the riveting between the plate 01 to be tested and the auxiliary plate to obtain the deformation of the plate 01 to be tested in the thickness direction;

[0032] Step 2: Place the top block 100 and the punch 200 on both sides of the plate 01 to be tested, so that the top block 100 and the punch 200 are respectively in contact with the end surfaces of both sides of the plate 01 to be tested;

[0033] Step 3: According to the deformation amount of the plate 01 to be tested in the thickness direction, use the punch 200 to punch the plate 01 to be tested in the direction of the top block 100 to obtain the deformation of the plate 01 to be tested, and judge the riveting performance of the plate 01 to be tested according to the deformation.

[0034] By applying the technical solution of the present invention, the riveting process of the auxiliary plate and the plate to be tested 01 can be simulated in the finite element analysis software to simulate the punching depth of the rivet in the thickness direction of the plate to be tested 01. And according to the punching depth of the plate to be tested 01 after the riveting is completed, the displacement of the punch 200 in the actual simulated punching test process is determined. After the punch 200 is punched, the riveting performance of the plate to be tested 01 can be judged according to the deformation of the plate to be tested 01, that is, the number of radial cracks and transverse cracks generated by the convex hull of the plate to be tested. In the above-mentioned test method, since the riveting result of the auxiliary plate and the plate to be tested 01 is first obtained in the finite element analysis software, the deformation of the plate to be tested 01 can be simulated. In this way, in the actual simulation test process, the auxiliary plate can be used for testing. The punch 200 only punches the single-piece plate to be tested 01 to make the plate to be tested 01 produce a deformation amount after riveting. The deformation of the plate to be tested 01 after riveting is completed can be obtained, which reduces the material loss in the simulation process, eliminates the tediousness of traditional double-piece plate testing, and simplifies the test process.

[0035] Specifically, the finite element analysis software can be ANSYS or ABAQUS.

[0036] Specifically, in step 1, the deformation amount of the plate 01 to be tested in the thickness direction includes a first deformation amount and a second deformation amount. Figure 3 As shown, the first deformation is the deformation amount of the plate to be tested 01 in the thickness direction when the auxiliary plate located above the plate to be tested 01 pierces. At this time, the deformation amount of the plate to be tested 01 in the thickness direction is L1; Figure 4 As shown, the second deformation is the deformation of the plate 01 to be tested in the thickness direction after riveting is completed, and the deformation of the plate 01 to be tested in the thickness direction is L2. Step three specifically includes: selecting multiple test values ​​between the first deformation and the second deformation, that is, selecting multiple values ​​between L1-L2, and punching the plate 01 to be tested multiple times with different test values ​​to obtain the deformation conditions under different test values, and judging the riveting performance of the plate 01 to be tested according to the deformation conditions. Through the above settings, it is possible to simulate the result that after the punch 200 penetrates the auxiliary plate, it directly acts on the plate 01 to be tested and causes the plate 01 to be tested to begin to deform until the plate 01 to be tested is deformed in this process after riveting is completed, so as to improve the test effect and help to judge the process of cracks in the plate 01 to be tested.

[0037] Specifically, in step three, when multiple values ​​between the first deformation amount and the second deformation amount are selected for testing, the test can be performed at the same position of the plate 01 to be tested, or at different positions.

[0038] Furthermore, the deformation amount of the plate 01 to be tested in the thickness direction also includes a third deformation amount, the third deformation amount is greater than the second deformation amount, and step three also includes selecting the third deformation amount to punch the plate 01 to be tested. Through the above settings, it can be tested that the influence of excessive riveting of the plate 01 to be tested, that is, excessive movement of the punch 200 during the riveting process, on the plate 01 to be tested can be obtained.

[0039] Furthermore, step three specifically includes: adjusting the punching speed of the punch 200 according to the deformation amount of the plate 01 to be tested in the thickness direction, punching the plate 01 to be tested multiple times to obtain the deformation conditions corresponding to different punching speeds under the same deformation amount, and judging the riveting performance of the plate 01 to be tested according to the deformation conditions. Through the above settings, the deformation conditions of the plate 01 to be tested under different punching speeds can be tested.

[0040] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0041] Example 1

[0042] A method for testing the riveting performance of a metal sheet, the testing method comprising the following steps:

[0043] (1) Finite element analysis was performed on the riveting of the test plate 01 and the auxiliary plate to obtain the deformation of the test plate 01 in the thickness direction, wherein the auxiliary plate was made of Q235 steel, and the test plate 01 was made of a 3 mm thick Al-Si alloy with an Si content of 8.5 wt.%, an Mn content of 0.55 wt.%, and the remaining elements being Al. When the auxiliary plate above the test plate 01 was pierced, the punching depth L1 of the test plate 01 in the thickness direction was 1.5 mm; after the riveting was completed, the punching depth L2 of the test plate 01 in the thickness direction was 2 mm.

[0044] (2) placing a top block 100 and a punch 200 on both sides of the plate 01 to be tested, so that the top block 100 and the punch 200 are respectively in contact with the end surfaces of both sides of the plate 01 to be tested;

[0045] (3) Use the punch 200 to punch the sheet 01 to be tested in the direction of the top block 100 at a speed of 1 mm / s, so that the movement amount of the punch 200 to punch the sheet 01 to be tested is 1.5 mm, obtain the deformation of the sheet 01 to be tested, and judge the riveting performance of the sheet 01 to be tested based on the deformation.

[0046] Example 2

[0047] The only difference from Example 1 is that in step (3), the movement amount of the punch 200 punching the plate to be tested is 1.7 mm.

[0048] Example 3

[0049] The only difference from Example 1 is that in step (3), the movement amount of the punch 200 punching the plate to be tested is 2.2 mm.

[0050] Example 4

[0051] The only difference from Example 1 is that the Si element content in step (3) is 9 wt.%.

[0052] Example 5

[0053] The only difference from Example 1 is that in step (3), the punch 200 punches the plate 01 to be tested toward the top block 100 at a speed of 5 mm / s.

[0054] Example 6

[0055] The only difference from Example 1 is that in step (1), the thickness of the auxiliary plate and the plate to be tested 01 are both 2 mm.

[0056] The deformation conditions of the tested plate 01 obtained in Examples 1-6 are shown in Table 1.

[0057] Table 1 Number of cracks at the riveted deformation of the tested plates in different embodiments

[0058] Example Number of radial cracks Number of transverse cracks Example 1 2 0 Example 2 4 0 Example 3 7 1 Example 4 5 1 Example 5 3 0 Example 6 10 2

[0059] As can be seen from Table 1, the solution of the present application can accurately simulate and characterize the riveting performance of plates of various materials and thicknesses, providing an efficient and reliable solution for material connection testing in a wide range of fields.

[0060] like Figure 1 As shown, the present application also provides a testing tool for the riveting performance of metal sheets, the testing tool is tested using the above-mentioned testing method, and the testing tool includes a base 300, a punch 200 and a stopper. Among them, the upper surface of the base 300 is used to place the sheet 01 to be tested, the upper surface of the base 300 has a receiving groove, and a top block 100 is arranged in the receiving groove. The top of the top block 100 is in the same plane as the upper surface of the base 300. The punch 200 has a punching end and a connecting end arranged oppositely, the punching end has a punching hole 210, and the punching hole 210 is arranged corresponding to the top block 100. The connecting end is used to connect with a driving member to drive the punch 200 to move toward the top block 100. The stopper is arranged between the punch 200 and the base 300, and the stopper is used to adjust the distance that the punch 200 moves toward the top block 100.

[0061] By using the test tool of the present application, the driving member can drive the punch 200 to move the punch 200 in the direction of the top block 100 to punch the sheet 01 to be tested for riveting test. The limiter can limit the distance that the punch 200 moves, so that the punch 200 can be accurately punched according to the deformation obtained by the finite element analysis simulation, thereby ensuring the test results and test accuracy of the test tool. By testing with the test tool, riveting parameters such as rivet length, riveting force, etc. can be optimized. It has the characteristics of low cost, high efficiency and good repeatability, and can quickly iterate and optimize design solutions, reducing the risks and costs of new product development. Through simulation testing, the feasibility and effect of the riveting process can be predicted and evaluated before actual production, effectively reducing potential problems in production and ensuring product performance.

[0062] Specifically, the driving member may be a metal tensile testing machine, so that the riveting performance test can be completed on the metal tensile testing machine without the need for professional riveting equipment, thereby reducing the testing cost and cycle.

[0063] Specifically, the limiting member includes a limiting block 400, and the punch 200 includes a stamping portion 201 and a connecting portion 202 connected to each other, the end of the stamping portion 201 away from the connecting portion 202 forms a stamping end, the diameter of the stamping portion 201 is smaller than the diameter of the connecting portion 202, and the side of the connecting portion 202 facing the stamping portion 201 has a stepped surface, and a limiting block 400 is arranged between the stepped surface and the base 300. Through the above arrangement, the limiting block 400 can limit the moving distance of the punch 200 to the base, and experiments under different stamping distances can be realized by replacing different limiting blocks 400, without replacing the base 300 or adjusting the driving parameters of the driving member.

[0064] In an optional embodiment of the present application, the limiting block 400 may be a cushion block with a perforation, and the perforation of the cushion block is arranged corresponding to the receiving groove of the base 300 to allow the punch 200 to pass through.

[0065] In the present application, a first thread segment is provided on one side of the stamping part 201 away from the stamping end, and a first screw hole is provided on one end of the connecting part 202 close to the stamping part 201, and the first thread segment is threadedly matched with the first screw hole. Through the above arrangement, the stamping part 201 can be easily replaced to select stamping holes 210 of different diameters.

[0066] Specifically, a second thread segment is provided on the connecting portion 202 , and the second thread segment can be used to connect with a metal tensile testing machine so as to facilitate the replacement of the punch 200 as a whole.

[0067] Furthermore, a cover plate 500 is also provided on the base 300, and the cover plate 500 is detachably provided on the upper surface of the base 300, and the plate 01 to be tested is placed between the cover plate 500 and the base 300, and a through hole 510 is provided on the cover plate 500, and the through hole 510 is used for the punch 200 to pass through. Through the above arrangement, the cover plate 500 can ensure the stability of the plate 01 to be tested on the base 300, so as to prevent the plate 01 to be tested from being deformed by the edge warping after being punched by the punch 200, thereby affecting the performance evaluation result. Specifically, the base 300 and the cover plate 500 can be connected by fasteners such as bolts or positioning pins, so as to facilitate the connection and separation of the base 300 and the cover plate 500.

[0068] like Figure 2 As shown, the punch hole 210 has a conical section 211 and a straight section 212 that are interconnected. The conical section 211 is arranged on the side of the straight section 212 away from the connection end, and the inner diameter of the conical section 211 gradually increases in the direction from the connection end to the punch end. Through the above arrangement, when the punch 200 completes the test and moves away from the sheet 01 to be tested to separate from the sheet 01 to be tested, the conical section 211 can reduce the risk of the punch 200 and the deformed sheet 01 to be tested being stuck, so as to prevent the punch 200 from applying a force to the sheet 01 to be tested a second time when the punch 200 is separated from the sheet 01 to be tested, thereby causing the sheet 01 to be tested to be deformed a second time.

[0069] Specifically, there is an angle between the inner wall of the tapered section 211 and the axis of the punch 200, and the angle is between 15° and 40°. When the angle between the inner wall of the tapered section 211 and the axis of the punch 200 is less than 15°, the angle is too small, which will affect the wall thickness of the punching end and reduce the structural strength of the punch 200; when the angle between the inner wall of the tapered section 211 and the axis of the punch 200 is greater than 40°, the angle is too large, which will affect the punching effect of the punch 200. In the present application, by setting the angle between 15° and 40°, the structural strength of the punch 200 can be guaranteed while ensuring the punching effect of the punch 200. Specifically, the angle can be set to 15°, 25°, 35° or 40°.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0072] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the riveting performance of metal sheets, characterized in that: The test method includes: Step 1: Perform finite element analysis on the riveting between the plate to be tested (01) and the auxiliary plate to obtain the deformation of the plate to be tested (01) in the thickness direction; Step 2: placing a top block (100) and a punch (200) on both sides of the plate (01) to be tested, so that the top block (100) and the punch (200) are respectively in contact with the end surfaces of both sides of the plate (01) to be tested; Step three: according to the deformation amount of the plate to be tested (01) in the thickness direction, use the punch (200) to punch the plate to be tested (01) in the direction of the top block (100), obtain the deformation condition of the plate to be tested (01), and judge the riveting performance of the plate to be tested (01) according to the deformation condition.

2. The method for testing the riveting performance of metal sheets according to claim 1, characterized in that: In the step 1, the deformation amount of the plate to be tested (01) in the thickness direction includes a first deformation amount and a second deformation amount, wherein the first deformation amount is the deformation amount of the plate to be tested (01) in the thickness direction when the auxiliary plate is pierced; and the second deformation amount is the deformation amount of the plate to be tested (01) in the thickness direction after riveting is completed. The step 3 specifically includes: A plurality of test values ​​between the first deformation amount and the second deformation amount are selected, and the plate to be tested (01) is punched multiple times at different test values ​​to obtain deformation conditions at different test values, and the riveting performance of the plate to be tested (01) is determined based on the deformation conditions.

3. The method for testing the riveting performance of metal sheets according to claim 2, characterized in that: The deformation amount of the plate to be tested (01) in the thickness direction also includes a third deformation amount, and the third deformation amount is greater than the second deformation amount. The step three also includes selecting the third deformation amount to punch the plate to be tested (01).

4. The method for testing the riveting performance of metal sheets according to claim 1, characterized in that: The step three specifically includes: According to the deformation amount of the plate (01) to be tested in the thickness direction, the punching speed of the punch (200) is adjusted, and the plate (01) to be tested is punched multiple times to obtain deformation conditions corresponding to different punching speeds under the same deformation amount, and the riveting performance of the plate (01) to be tested is judged according to the deformation conditions.

5. A testing tool for the riveting performance of metal sheets, characterized in that: The test tool is tested using the test method described in any one of claims 1 to 4, and the test tool comprises: A base (300), the upper surface of the base (300) being used to place the plate (01) to be tested, the upper surface of the base (300) being provided with a receiving groove, a top block (100) being arranged in the receiving groove, and the top end of the top block (100) being in the same plane as the upper surface of the base (300); A punch (200), the punch (200) having a punching end and a connecting end arranged opposite to each other, the punching end having a punching hole (210), the punching hole (210) being arranged corresponding to the top block (100), and the connecting end being used to connect with a driving member to drive the punch (200) to move toward the top block (100); A limiter is arranged between the punch (200) and the base (300), and the limiter is used to adjust the distance that the punch (200) moves toward the top block (100).

6. The metal sheet riveting performance testing tool according to claim 5, characterized in that: The limiting component comprises a limiting block (400); the punch (200) comprises a stamping portion (201) and a connecting portion (202) which are connected to each other; an end of the stamping portion (201) away from the connecting portion (202) forms the stamping end; the diameter of the stamping portion (201) is smaller than the diameter of the connecting portion (202); the connecting portion (202) has a stepped surface on a side facing the stamping portion (201); and the limiting block (400) is arranged between the stepped surface and the base (300).

7. The metal sheet riveting performance testing tool according to claim 6, characterized in that: A first threaded section is provided on a side of the punching portion (201) away from the punching end, and a first screw hole is provided on an end of the connecting portion (202) close to the punching portion (201), and the first threaded section is threadably matched with the first screw hole.

8. The metal sheet riveting performance testing tool according to claim 5, characterized in that: The base (300) is also provided with a cover plate (500), the cover plate (500) is detachably provided on the upper surface of the base (300), the plate (01) to be tested is placed between the cover plate (500) and the base (300), and the cover plate (500) is provided with a through hole (510), the through hole (510) is used for the punch (200) to pass through.

9. The metal sheet riveting performance testing tool according to claim 5, characterized in that: The punching hole (210) comprises a conical section (211) and a straight section (212) which are connected to each other, the conical section (211) being arranged on a side of the straight section (212) away from the connecting end, and the inner diameter of the conical section (211) gradually increases in a direction from the connecting end to the punching end.

10. The metal sheet riveting performance testing tool according to claim 9, characterized in that: An included angle is formed between the inner wall of the tapered section (211) and the axis of the punch (200), and the included angle is between 15° and 40°.

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