Impact-position-adjustable drop hammer impact testing machine for self-piercing riveting joint

Abstract

The utility model discloses a drop hammer impact testing machine with an adjustable impact position for a self-piercing riveting joint, and particularly relates to the technical field of testing machines, which comprises a platform main body, a drop hammer assembly and a self-piercing riveting joint clamp, the platform body comprises a pedestal and guide rods, the guide rods are fixedly connected to the two ends of the pedestal, and the drop hammer assembly is slidably arranged on the guide rods. The drop hammer assembly comprises a drop hammer bearing platform and a drop hammer body; the self-piercing riveting joint clamp comprises a clamp base, a clamp upper plate, a gasket I and a gasket II, and the clamp base is fixedly connected to the pedestal; according to the utility model, the problem that the impact position is tedious to adjust in the drop hammer impact test of the self-piercing riveting joint is solved; and meanwhile, the clamp of the drop hammer impact testing machine is specially adapted to the self-piercing riveting joint, so that the joint can be clamped more conveniently and stably, and the testing efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of testing machine technology, specifically relating to a drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position. Background Technology

[0002] Self-piercing riveting, as a new type of sheet metal joining technology, requires no pretreatment during its forming process. It is a cold forming technology that uses stamping to create an interlocking structure between the rivet and the upper and lower plates. Its joints have high mechanical strength and good fatigue resistance, and it is suitable for joining a variety of materials. It is currently the most valuable joining process and is therefore widely used in the joining of vehicle body materials.

[0003] During the service life of a vehicle, the vehicle body structure will inevitably be affected by various external loads, such as impacts and collisions. However, for the vehicle body structure, the impacts mainly come from low-speed impacts, such as the impact of sand and gravel kicked up during driving, and the impact of hail on the vehicle body in severe weather. The speed of these impacts is usually in the range of 1-10m / s and the impact energy is usually less than 30J. Moreover, the location of the impact on the vehicle body is relatively random.

[0004] Therefore, it is essential to study the impact bearing capacity of self-piercing riveted joints in different locations. Currently, the drop hammer impact testing machine used in research still has the following shortcomings:

[0005] I. Currently, the drop hammer impact test for self-piercing riveting joints uses a general-purpose drop hammer impact testing machine, which is usually used to test the impact resistance of a whole piece of material. The drop hammer is usually fixed at the center of the bearing platform. If it is used to test the impact resistance of self-piercing riveting joints, it can only be used to impact the center point of the riveting. If it is necessary to impact other positions, the adjustment process is very cumbersome, which reduces the test efficiency.

[0006] 2. When clamping self-piercing riveting joints on a general-purpose drop hammer impact testing machine, the clamping is very inconvenient because the fixture is not specifically adapted to self-piercing riveting joints, which reduces the testing efficiency.

[0007] Therefore, there is an urgent need to develop a drop hammer impact testing machine that allows for adjustment of the impact position and features a fixture adapted to self-piercing riveting joints, making it easy to operate. Summary of the Invention

[0008] The purpose of this invention is to propose a drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position, so as to solve the problems of mismatched fixtures and cumbersome adjustment of impact position encountered when using general-purpose drop hammer impact testing machines for drop hammer impact testing of self-piercing riveting joints, and effectively improve the efficiency and convenience of the test.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position includes a platform body, a drop hammer assembly, and a self-piercing riveting joint fixture.

[0011] The platform body includes a base and a guide rod. The guide rod is fixedly connected to both ends of the base, and the drop hammer assembly is slidably mounted on the guide rod.

[0012] The drop hammer assembly includes a drop hammer support platform and a drop hammer body;

[0013] The self-piercing riveting joint fixture includes a fixture base, a fixture upper plate, a first gasket, and a second gasket. The fixture base is fixedly connected to the base.

[0014] Preferably, the bottom of the drop hammer body is provided with a threaded hole, and the middle of the drop hammer bearing platform is provided with a limiting groove 1 for placing the drop hammer body. On both sides of the limiting groove 1, there are limiting grooves 2 and 3 for bolting the drop hammer body to the drop hammer bearing platform. By cooperating with the three limiting grooves, the placement position of the drop hammer can be adjusted according to the different impact positions required.

[0015] Preferably, the upper plate of the fixture has a limiting groove four in the middle for impact by the falling hammer, which corresponds to the limiting groove one of the falling hammer bearing platform, so that the falling hammer after adjusting the impact position can impact the designated position. The first gasket is connected to the middle right end of the upper plate of the fixture by adhesive bonding, which plays a role in fixing the lower plate of the self-piercing riveting joint. The second gasket is connected to the middle left end of the fixture base by adhesive bonding, which plays a role in fixing the upper plate of the self-piercing riveting joint. The upper plate of the fixture is connected to the fixture base by bolts to ensure reliable clamping of the joint.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] By proposing a drop hammer impact testing machine for self-piercing riveted joints with adjustable impact position, the problem of cumbersome adjustment of impact position in drop hammer impact testing of self-piercing riveted joints is solved; at the same time, the clamps of the drop hammer impact testing machine are specially adapted to self-piercing riveted joints, which makes the joint more convenient and stable to clamp, and greatly improves the testing efficiency. Attached Figure Description

[0018] Figure 1 This is one of the perspective views of this utility model;

[0019] Figure 2 This is a second perspective view of the present utility model;

[0020] Figure 3 This is a top view of the drop hammer bearing platform 11 described in this utility model;

[0021] Figure 4This is a front view of the drop hammer body 12 described in this utility model;

[0022] Figure 5 This is a bottom view of the drop hammer body 12 described in this utility model;

[0023] Figure 6 This is a top view of the upper plate 22 of the clamp described in this utility model;

[0024] Figure 7 The bottom view of the fixture upper plate 22 of this utility model with the gasket 23 installed;

[0025] Figure 8 A schematic diagram showing the installation of the second shim 24 on the clamp base 21 of this utility model;

[0026] Figure 9 This is a schematic diagram of a self-piercing riveting joint;

[0027] Figure 10 This is a schematic diagram showing the fixture base 21 and fixture upper plate 22 with the gaskets installed.

[0028] Figure 11 A schematic diagram showing the installation of the self-piercing riveting joint in preparation for an impact test.

[0029] The numbers in the attached diagram are:

[0030] 1-Base, 2-Guide rod, 11-Falling hammer bearing platform, 12-Falling hammer body, 13-Limiting groove one, 14-Limiting groove two, 15-Limiting groove three, 21-Clamping base, 22-Clamping upper plate, 23-Shim one, 24-Shim two, 25-Limiting groove four. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] like Figure 1 and Figure 2As shown, this utility model provides a drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position, including a platform body, a drop hammer assembly, and a self-piercing riveting joint fixture; the platform body includes a base 1 and a guide rod 2, the guide rod 2 is fixedly connected to both ends of the base 1, and the drop hammer assembly is slidably mounted on the guide rod 2; the drop hammer assembly includes a drop hammer bearing platform 11 and a drop hammer body 12; the self-piercing riveting joint fixture includes a fixture base 21, a fixture upper plate 22, a first gasket 23, and a second gasket 24, the fixture base 21 being fixedly connected to the base 1.

[0034] like Figures 3-5 As shown, the bottom of the drop hammer body 12 has a threaded hole. When in use, the drop hammer body 12 is placed in the limiting groove 13 in the middle of the drop hammer bearing platform 11, and then the two threaded holes at the bottom of the drop hammer body 12 are aligned with the limiting grooves 14 and 15 on both sides of the limiting groove 13, and then fixed with bolts.

[0035] like Figures 6-10 As shown, when using it, first connect the first gasket 23 to the middle right end of the upper plate 22 of the fixture by adhesive bonding, then connect the second gasket 24 to the middle left end of the base 21 of the fixture by adhesive bonding, and then correctly place the self-piercing riveting joint on the base 21 of the fixture, and connect the upper plate 22 of the fixture to the base 21 of the fixture with bolts.

[0036] In summary, combining the above technical solutions, Figures 1-11 The embodiments of this utility model are further described below:

[0037] In use, first glue gasket 1 23 to the middle right end of the upper plate 22 of the fixture, and glue gasket 2 24 to the middle left end of the base 21 of the fixture. Then, correctly place the self-piercing riveting joint on the base 21 of the fixture and connect the upper plate 22 of the fixture to the base 21 of the fixture with bolts. Then, according to the impact position required by the test, place the drop hammer body 12 in the appropriate position of the limiting groove 13 opened in the middle of the drop hammer bearing platform 11. Then, align the two threaded holes at the bottom of the drop hammer body 12 with the limiting grooves 2 14 and 3 15 opened on both sides of the limiting groove 13 and fix them with bolts. Finally, lift the drop hammer assembly to the specified height and release it. The drop hammer body 12 impacts the self-piercing riveting joint at the specified position through the limiting groove 4 25.

[0038] Furthermore, the weight design of the drop hammer body 12 in this utility model is reasonable, and the structural strength of the drop hammer bearing platform 11 is sufficient. When the drop hammer body 12 moves and is fixed at different positions in the limiting groove 13, its position change has little impact on the overall center of gravity of the drop hammer bearing platform 11, and will not cause the bearing platform to tilt significantly, thereby ensuring that the position of the drop hammer body 12 is stable during the impact process, and ensuring the accuracy of the impact position and the reliability of the experimental results.

Claims

1. A drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position, characterized in that, Includes the platform body, drop hammer assembly, and self-piercing riveting joint fixture; The platform body includes a base (1) and a guide rod (2). The guide rod (2) is fixedly connected to both ends of the base (1), and the drop hammer assembly is slidably disposed on the guide rod (2). The drop hammer assembly includes a drop hammer support platform (11) and a drop hammer body (12). The drop hammer support platform (11) has a limiting groove (13) in the middle for placing the drop hammer body (12), and the drop hammer body (12) slides along the limiting groove (13) to adjust the position of the drop hammer. The self-piercing riveting joint fixture is mounted on the base (1) and faces the drop hammer assembly.

2. The drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position according to claim 1, characterized in that, The self-piercing riveting joint fixture includes a fixture base (21) and a fixture upper plate (22). The fixture base (21) is fixedly connected to the base (1). The fixture upper plate (22) has a limiting groove (25) in the middle for impact by a drop hammer.

3. A drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position according to claim 1, characterized in that, The bottom of the drop hammer body (12) is provided with a threaded hole, and the two sides of the limiting groove one (13) are provided with limiting groove two (14) and limiting groove three (15) for bolting connection between the drop hammer body (12) and the drop hammer bearing platform (11).

4. A drop hammer impact testing machine for self-piercing riveting joints with adjustable impact position according to claim 2, characterized in that; The self-piercing riveting joint fixture also includes a first gasket (23) and a second gasket (24). The first gasket (23) is connected to the middle right end of the upper plate (22) of the fixture by adhesive bonding. The second gasket (24) is connected to the middle left end of the base (21) of the fixture by adhesive bonding. The upper plate (22) of the fixture is connected to the base (21) of the fixture by bolts.

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