Spot welding punching-free cross tensile test clamp
By designing a spot-welded hole-free cross tensile test fixture using fastening bolts and anti-slip rubber contact surfaces, the problem of hole punching test samples in the prior art is solved, and a high-precision and low-cost cross tensile test is achieved.
Patent Information
- Application Number
- CN202421139127.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-23
AI Technical Summary
Existing cross tensile testing fixtures require holes and positioning operations on the test samples, which increases the difficulty and cost of the test and affects the accuracy of the test results.
A spot-welded hole-free cross tensile test fixture is designed, and a combination of fastening bolts and anti-slip rubber contact surfaces is used to ensure that the test sample does not displace in other directions and avoid hole-punching operations.
A cross tensile test without drilling the test samples is realized, which simplifies operation, improves test accuracy and reuse rate, and reduces test costs.
Smart Images
Figure CN222913314U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of spot welding tests for thin plates, and particularly relates to a spot welding non-punching cross tensile test fixture. Background Art
[0002] During the spot welding test of thin plates, in order to measure the positive tensile stress of the solder joints, a cross tensile test is often adopted, and there is currently no tensile testing machine specifically designed for the cross tensile test.
[0003] Currently, a cross tensile fixture is mostly designed to enable the test to be carried out on a general tensile testing machine. However, the current fixture requires operations such as punching and positioning the test sample, which not only increases the difficulty and cost of the test, but also the positioning accuracy has an adverse impact on the test results. Summary of the Utility Model
[0004] In order to overcome the problems that the existing fixture requires punching and positioning operations on the test sample, which increases the difficulty and cost of the test, the utility model provides a spot welding non-punching cross tensile test fixture. The utility model adopts a combination of fastening bolts and anti-slip rubber contact surfaces to ensure that the test sample does not displace in other directions and ensure the test accuracy. The utility model does not require punching the test sample, has simple operation, and has a relatively high reuse rate. The fixture is not easily damaged, saving the test cost.
[0005] The technical solution adopted by the utility model is as follows:
[0006] A spot welding non-punching cross tensile test fixture includes T-shaped connecting plates. There are two T-shaped connecting plates, which are arranged up and down. The horizontal ends of the two T-shaped connecting plates are used to place a cross spot welding sample, and the four ends of the cross spot welding sample are respectively connected to the corresponding T-shaped connecting plates through corresponding fastening connection devices.
[0007] The T-shaped connecting plate includes a horizontal section, a vertical section and a protrusion. The vertical section is vertically arranged in the middle of the horizontal section. Protrusions are arranged on both sides of the horizontal section near the two ends, and screw holes are opened on the protrusions. A rubber layer is coated on the lower surface of the horizontal section of the T-shaped connecting plate.
[0008] The fastening connection device includes a fastening connecting plate, a bolt, a nut and a fastening bolt. The four connection points of the cross spot welding sample are fixed on the corresponding T-shaped connecting plate through the fastening connecting plate, the bolt and the nut. A through hole is opened in the middle of the fastening connecting plate, and a fastening bolt is arranged in the through hole.
[0009] A rubber layer with a thickness of 0.5 mm to 3 mm is coated on the lower surface of the fastening bolt.
[0010] The friction coefficient of the rubber layer on the lower surface of the fastening bolt is between 0.4 and 0.6, and the anti-slip coefficient is between 0.6 and 0.8.
[0011] The connection directions of the nuts and bolts on the two T-shaped connecting plates are opposite.
[0012] A rubber layer with a thickness of 4 mm to 6 mm is coated on one side surface of the fastening connecting plate.
[0013] A rubber layer with a thickness of 3 mm to 5 mm is coated on the lower surface of the horizontal section of the T-shaped connecting plate.
[0014] The outer end edge of the cross-spot welding sample is 8 mm to 23 mm away from the edge in the length direction of the T-shaped connecting plate.
[0015] The beneficial effects of the present utility model:
[0016] In the present utility model, rubber layers are coated on the parts where the T-shaped connecting plate, the fastening connecting plate and the fastening bolt are in contact with each other. The rubber layer has the functions of anti-slip and protecting the cross-spot welding sample from being scratched. The present utility model adopts the combination of the fastening bolt and the anti-slip rubber contact surface to ensure that the cross-spot welding sample does not displace in other directions and ensure the test accuracy.
[0017] In the present utility model, the combination directions of the nuts and bolts on the two T-shaped connecting plates are opposite, which ensures the balance of force during the stretching process, ensures that the bolts are evenly stressed, and avoids the occurrence of skew or imbalance.
[0018] The present utility model further fixes the fastening connecting plate through the fastening bolt to ensure the stability and safety of the connection. Description of the drawings
[0019] The following will further describe the present utility model in detail with reference to the drawings.
[0020] Figure 1 It is a schematic structural diagram of the present utility model.
[0021] Figure 2 It is an overall three-dimensional explosion schematic diagram of the structure of the present utility model.
[0022] Figure 3 It is a schematic structural diagram of the T-shaped connecting plate.
[0023] Figure 4 It is a schematic structural diagram of the fastening bolt.
[0024] In the figure, the reference numerals are:
[0025] 1. T-shaped connecting plate; 2. Side connecting plate; 3. Nut; 4. Bolt; 5. Fastening bolt. Specific embodiments
[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0027] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.
[0028] Embodiment 1:
[0029] In order to overcome the problems that the existing fixture requires punching and positioning operations on the test sample, increasing the difficulty and cost of the test, the present invention provides a spot welding non-punching cross-tensile test fixture as shown in Figures 1 - 4 . The present invention adopts a combination of fastening bolts and anti-slip rubber contact surfaces to ensure that the test sample does not displace in other directions and ensure the test accuracy. The present invention does not require punching the test sample, has simple operation, and has a high reuse rate. The fixture is not easily damaged, saving the test cost.
[0030] A spot welding non-punching cross-tensile test fixture includes a T-shaped connecting plate 1. There are two T-shaped connecting plates 1, which are arranged up and down. A cross spot welding sample is placed between the horizontal ends of the two T-shaped connecting plates 1. Four ends of the cross spot welding sample are respectively connected to the corresponding T-shaped connecting plate 1 through corresponding fastening connection devices.
[0031] In the present invention, the experimental sample is a cross spot welding sample. Rubber layers are coated on the parts where the T-shaped connecting plate 1, the fastening connecting plate 2, and the fastening bolt 5 are in contact with each other. The rubber layer has the functions of anti-slip and protecting the cross spot welding sample from being scratched. The present invention adopts a combination of fastening bolts 5 and anti-slip rubber contact surfaces to ensure that the cross spot welding sample does not displace in other directions and ensure the test accuracy. The present invention does not require punching the test sample, has simple operation, and has a high reuse rate. The fixture is not easily damaged, saving the test cost.
[0032] Embodiment 2:
[0033] Based on Embodiment 1, in this embodiment, preferably, the T-shaped connecting plate 1 includes a horizontal section, a vertical section, and a protrusion. The vertical section is perpendicularly provided in the middle of the horizontal section. On both sides of the horizontal section near the two ends, protrusions are provided, and screw holes are opened on the protrusions. A rubber layer is coated on the lower surface of the horizontal section of the T-shaped connecting plate 1.
[0034] Preferably, a rubber layer with a thickness of 3 mm to 5 mm is coated on the lower surface of the horizontal section of the T-shaped connecting plate 1.
[0035] In the present utility model, the structure of the T-shaped connecting plate 1 is as Figure 3 shown. The length of the horizontal section of the T-shaped connecting plate 1 is 100 mm to 300 mm, the width is 20 mm to 50 mm, and the thickness is 1 mm to 8 mm; the surface roughness Ra is between 1.6 and 2.3 μm.
[0036] In the present utility model, rubber layers are coated on the surfaces of the two T-shaped connecting plates 1, and the rubber layer is one or two of nitrile rubber (NBR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), silicone rubber (VMQ), fluororubber (FKM), and acrylic rubber (ACM).
[0037] In the present utility model, the rubber layers coated on the surfaces of the two T-shaped connecting plates 1 have granular textures or strip textures on the surface. The thickness of the rubber layers coated on the surfaces of the two T-shaped connecting plates 1 is 3 mm to 5 mm, the hardness is 50 Shore A to 80 Shore A, the friction coefficient is 0.1 to 0.6, the friction coefficient is 0.3 to 0.6, and the anti-slip coefficient is 0.6 to 0.9.
[0038] For the two T-shaped connecting plates 1, the horizontal sections are opposite to each other, and the included angle between the two horizontal sections in the horizontal direction is 87° to 93°. In the present utility model, the included angle between the two horizontal sections of the two T-shaped connecting plates 1 in the horizontal direction is preferably 88°, 90°, or 92°, ensuring that the overall contact connection of the cross-spot welding sample is on the T-shaped connecting plate 1, which is convenient for subsequent tensile experiments.
[0039] Preferably, the fastening connection device includes a fastening connecting plate 2, a bolt 4, a nut 3, and a fastening bolt 5. At the four connection points of the cross-spot welding sample, they are fixed on the corresponding T-shaped connecting plate 1 through the fastening connecting plate 2, the bolt 4, and the nut 3. A through hole is opened in the middle of the fastening connecting plate 2, and a fastening bolt 5 is provided in the through hole.
[0040] Preferably, a rubber layer with a thickness of 4 mm to 6 mm is coated on one side surface of the fastening connecting plate 2.
[0041] In the present utility model, the horizontal length of the fastening connecting plate 2 is 30 mm to 60 mm, the width is 10 mm to 20 mm, and the thickness is 1 mm to 8 mm. Rubber layers are coated on the surfaces of the four fastening connecting plates 2, and the rubber layer is one or two of nitrile rubber (NBR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), silicone rubber (VMQ), fluororubber (FKM), and acrylic rubber (ACM); the thickness of the rubber layer is 4 mm to 6 mm, and the hardness is 60 Shore A to 90 Shore A. The friction coefficient of the rubber layer coated on the surfaces of the four fastening connecting plates 2 is 0.4 to 0.6, and the anti-slip coefficient is 0.7 to 0.9.
[0042] Preferably, a rubber layer with a thickness of 0.5 mm to 3 mm is coated on the lower surface of the fastening bolt 5.
[0043] Preferably, the friction coefficient of the rubber layer on the lower surface of the fastening bolt 5 is between 0.4 and 0.6, and the anti-slip coefficient is between 0.6 and 0.8.
[0044] As Figure 4 shown, rubber layers are coated on the surfaces of the four fastening bolts 5, and the rubber layer coated on the surfaces of the four fastening bolts 5 is one or two of nitrile rubber (NBR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), silicone rubber (VMQ), fluororubber (FKM), and acrylic rubber (ACM). The thickness of the rubber layer is 0.5 mm to 3 mm, and the hardness is 40 Shore A to 70 Shore A; the friction coefficient of the rubber layer is between 0.4 and 0.6, and the anti-slip coefficient is between 0.6 and 0.8. The pitch of the four fastening bolts 5 is 0.3 mm to 0.75 mm, and the length is 10 mm to 20 mm.
[0045] Preferably, the connection directions of the nuts 3 and bolts 4 on the two T-shaped connecting plates 1 are opposite.
[0046] In the present utility model, the combination directions of the nuts 3 and bolts 4 on the two T-shaped upper connecting plates 1 are opposite, ensuring the balance of force during the stretching process, ensuring that the bolts 4 are evenly stressed, and avoiding skewing or imbalance.
[0047] Preferably, the outer end edge of the cross-spot welding sample is 8 mm to 23 mm away from the edge in the length direction of the T-shaped connecting plate 1.
[0048] In the present utility model, as Figure 1 and Figure 2As shown, there are two T-shaped connecting plates 1 and four fastening connecting plates 2, with a texture thickness between 0.5 mm and 2 mm. The aperture diameter of the holes drilled on the two T-shaped connecting plates 1 and the four fastening connecting plates 2 is between 5 mm and 8 mm; the chamfer of the holes drilled on the two T-shaped connecting plates 1 and the four fastening connecting plates 2 is between 0.1 mm and 0.3 mm. The length of the four ends of the cross-spot welding sample is between 60 mm and 160 mm.
[0049] In this utility model, the four fastening connecting plates 2 connect the cross-spot welding sample to the two T-shaped connecting plates 1, and a set of nuts 3 and bolts 4 are required for each connection point. The combination of eight sets of nuts 3 and bolts 4 uses hexagon head full thread bolts with a pitch between 0.5 mm and 1.25 mm and a length between 30 mm and 50 mm, and the corresponding bolts are selected according to specific requirements. The four fastening bolts 5 are designed as adjustable movable parts to ensure the flexibility and accuracy of the connection.
[0050] In this utility model, the two T-shaped connecting plates 1 and the four fastening connecting plates 2 are all made of one or two of high-strength alloy steel, cast iron, and aluminum alloy. Ensure that the overall fixture has sufficient strength during the test, will not deform, and will not affect the experimental data.
[0051] The specific working process of this utility model is as follows:
[0052] First, place the cross-spot welding sample accurately on the T-shaped connecting plate 1. The included angle between the horizontal ends of the two T-shaped connecting plates 1 is between 87° and 93°, ensuring that the position of the cross-spot welding sample is aligned with the T-shaped connecting plate 1, and the edge distance from the lengthwise edge of the T-shaped connecting plate 1 is 8 mm to 23 mm. Then use nuts 3 and bolts 4 to fix the fastening connecting plate 2 to the T-shaped connecting plate 1 and gradually tighten it to achieve the required connection tightness, ensuring that the surface spacing between the T-shaped connecting plate 1 and the fastening connecting plate 2 is equal everywhere.
[0053] The combination directions of the nuts 3 and bolts 4 on the two T-shaped connecting plates 1 are opposite to ensure the balance of force during the stretching process, ensure that the bolts 4 are evenly stressed, and avoid skewing or imbalance. Finally, use the fastening bolts 5 to further fix the fastening connecting plate 2 to ensure the stability and safety of the connection. After completion, check the entire connection structure to ensure that all parts are firm and reliable without looseness or misalignment.
[0054] Once the cross-welded joint sample is placed in the fixture and in the correct position, horizontal fixation can be carried out. This involves horizontally fixing one side's T-shaped connecting plate 1 of the fixture. This can be achieved by various methods, such as using bolts to tightly fix the fixture to the T-shaped connecting plate 1 to ensure that the T-shaped connecting plate 1 does not move during the test. Next, a tensile force in the horizontal direction is applied to the T-shaped connecting plate 1 on the other side of the fixture. This is usually done by a hydraulic press, an electric motor, or other force-applying devices. The application of the tensile force should be gradual until the cross-welded joint sample is damaged. During the test, the relationship between the tensile force and the sample displacement (or strain) is usually recorded to evaluate the tensile properties and failure characteristics of the sample.
[0055] The whole process needs to be carried out carefully to ensure that the cross-welded joint sample is placed correctly and the applied force is uniform and accurately controlled to obtain reliable and accurate test results.
[0056] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0057] It should also be understood that the terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in the specification of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.
[0058] The above examples are only illustrative of the present utility model and do not constitute a limitation on the protection scope of the present utility model. Any design identical or similar to the present utility model falls within the protection scope of the present utility model. The device structures and method steps not described in detail in the present utility model are prior arts and will not be further described in the present utility model.
Claims
1. A spot welding punch-free cross tensile test fixture, characterized in that: It comprises a T-shaped connecting plate (1), wherein the number of the T-shaped connecting plates (1) is two, the two T-shaped connecting plates (1) are arranged up and down, and a cross spot welding sample is placed between the horizontal ends of the two T-shaped connecting plates (1), and the four ends of the cross spot welding sample are connected to the corresponding T-shaped connecting plate (1) via corresponding fastening connection devices.
2. A spot welding punch-free cross tensile test fixture according to claim 1, characterized in that: The T-shaped connecting plate (1) comprises a horizontal section, a vertical section and a protrusion, wherein the vertical section is vertically arranged in the middle of the horizontal section, protrusions are arranged on both sides of the horizontal section near the two ends, and screw holes are arranged on the protrusions, and a rubber layer is coated on the lower surface of the horizontal section of the T-shaped connecting plate (1).
3. A spot welding punch-free cross tensile test fixture according to claim 1, characterized in that: The fastening connection device comprises a fastening connection plate (2), bolts (4), nuts (3) and fastening bolts (5); the four connection points of the cross spot welding sample are fixed to the corresponding T-shaped connection plate (1) by means of the fastening connection plate (2), bolts (4) and nuts (3); a through hole is opened in the middle of the fastening connection plate (2), and a fastening bolt (5) is arranged in the through hole.
4. A spot welding punch-free cross tensile test fixture according to claim 3, characterized in that: The lower surface of the fastening bolt (5) is coated with a rubber layer having a thickness of 0.5 mm to 3 mm.
5. A spot welding punch-free cross tensile test fixture according to claim 4, characterized in that: The friction coefficient of the rubber layer on the lower surface of the fastening bolt (5) is between 0.4 and 0.6, and the anti-slip coefficient is between 0.6 and 0.
8.
6. A spot welding punch-free cross tensile test fixture according to claim 3, characterized in that: The nuts (3) and bolts (4) on the two T-shaped connecting plates (1) are connected in opposite directions.
7. A spot welding punch-free cross tensile test fixture according to claim 3, characterized in that: A rubber layer with a thickness of 4 mm to 6 mm is coated on one side surface of the fastening connecting plate (2).
8. The spot welding punch-free cross tensile test fixture according to claim 2, characterized in that: A rubber layer with a thickness of 3 mm to 5 mm is coated on the lower surface of the horizontal section of the T-shaped connecting plate (1).
9. A spot welding punch-free cross tensile test fixture according to claim 2, characterized in that: The outer edge of the cross spot weld sample is 8 mm to 23 mm away from the edge of the T-shaped connecting plate (1) in the length direction.