Sheet metal tensile test clamp
By designing a tensile test fixture for metal sheets, the combination of the rotating shaft and the stop claws ensures that the welding joint is stretched under pure shear stress, and the bending moment of the spot welding joint in the tensile test machine is solved. The problem of error improves the accuracy and operating efficiency of shear performance measurement.
Patent Information
- Application Number
- CN202420558035.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-21
AI Technical Summary
When evaluating the mechanical properties of spot welding joints, the ordinary tensile experimental machine has not been on the same plane at both ends of the test sample, which causes the welding joints to bear bending moments in addition to shearing force, resulting in errors in the measurement results and the pure shear stress state, which affects the impact of Accuracy of shear performance measurement.
Design a metal sheet tensile test fixture, including hollow chuck, chuck slider, stop claw, pawl, rotary shaft, solid chuck, push rod and chuck shell, through the cooperation of the rotary shaft and stop claw , ensure that the welding joint is stretched under pure shear stress and reduce the impact of bending moment.
It has achieved the reduction of bending moment during welding joint stretching, improved the accuracy of measuring welding joint shear performance, and has the characteristics of simple equipment structure, convenient operation and high efficiency.
Smart Images
Figure CN222232184U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a metal plate tensile test fixture and belongs to the technical field of metal plate tensile test equipment in the metallurgical industry. Background Art
[0002] Steel has become the main material for automobile body parts due to its high strength, good formability, excellent recyclability and relatively low production cost. Resistance spot welding has been widely used in the automotive industry due to its high production efficiency and easy automation, and has become the main welding method in the automotive industry. The organization, performance and failure mode of spot welding joints directly affect the safety of components and vehicles.
[0003] Spot welding tests were conducted and the mechanical properties of spot welded joints were evaluated, mainly using the tearing method, shearing method, torsion method and metallographic method. Among them, the shearing method uses a tensile testing machine to clamp the two ends of the welded sample and shear and break it. This method is suitable for all kinds of plate-like samples with regular shapes and an unlimited number of welds. However, since the spot welding sample plates are overlapped, the sample plates on both sides are not in the same plane. Therefore, when testing on an ordinary tensile testing machine, since the two ends of the sample plates are not in the same plane, the welds are subjected to a certain bending moment in addition to the shear force, resulting in errors in the measurement results and the pure shear stress state. Utility Model Content
[0004] The utility model aims to provide a metal plate tensile test fixture, which can reduce the bending moment of the plate weld during the stretching process, meet the requirements of the pure shear stress state of the weld, improve the accuracy of the weld shear performance measurement, and solve the problems existing in the background technology.
[0005] The technical solution of the utility model is:
[0006] A metal plate tensile test fixture comprises a hollow chuck, a chuck slider, a stop pawl, a ratchet, a rotating shaft, a solid chuck, a push rod and a chuck shell, wherein the hollow chuck and the solid chuck are respectively arranged inside the chuck shell, the chuck slider is slidably connected in the hollow chuck, a linear tooth groove is provided at the bottom of the chuck slider, the rotating shaft is installed on the hollow chuck, a cylindrical gear matching with the linear tooth groove at the bottom of the chuck slider is provided on the rotating shaft, the ratchet is fixed to the rotating shaft by a flat key, and the hollow chuck is provided with a stop pawl matching with the ratchet; the push rod penetrates from the top of the chuck shell, and the push rod head is stuck between the hollow chuck and the solid chuck.
[0007] Limiting plates matching with the hollow chuck and the solid chuck are respectively arranged on both sides of the chuck shell.
[0008] Springs are respectively arranged between the chuck shell and the hollow chuck and the solid chuck.
[0009] The contact surfaces of the hollow chuck and the solid chuck with the chuck shell are inclined surfaces.
[0010] A sliding groove matched with the chuck slider is arranged in the hollow chuck.
[0011] The side surface of the chuck slider is marked with scales.
[0012] The stop claw on the hollow chuck matched with the ratchet is inserted between the claws of the ratchet.
[0013] The contact surfaces of the hollow chuck, the chuck slider and the solid chuck with the sample are provided with anti-slip grooves.
[0014] The utility model has the beneficial effects of realizing the shear method test of metal plate weld spot, reducing the bending moment in the stretching process of plate weld spot, improving the accuracy of weld spot shear performance measurement, and has the characteristics of simple equipment structure, convenient operation and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG1 is an isometric view of the utility model;
[0016] FIG2 is an exploded isometric view of the chuck of the present invention;
[0017] The markings in the figure are as follows: hollow chuck 1, chuck slider 2, stop claw 3, ratchet 4, flat key 5, rotating shaft 6, solid chuck 7, push rod 8, chuck housing 9, spring 10, limit plate 11. DETAILED DESCRIPTION
[0018] The present invention will be further described below by way of examples with reference to the accompanying drawings.
[0019] Refer to the attached Figure 1 , 2 A metal sheet tensile test fixture comprises a hollow chuck 1, a chuck slider 2, a stop claw 3, a ratchet 4, a rotating shaft 6, a solid chuck 7, a push rod 8 and a chuck shell 9, wherein the hollow chuck 1 and the solid chuck 7 are respectively arranged inside the chuck shell 9, the chuck slider 2 is slidably connected in the hollow chuck 1, a linear tooth groove is provided at the bottom of the chuck slider 2, the rotating shaft 6 is installed on the hollow chuck 1, a cylindrical gear matching the linear tooth groove at the bottom of the chuck slider 2 is provided on the rotating shaft 6, the ratchet 4 is fixed on the rotating shaft 6 by a flat key 5, and a stop claw 3 matching the ratchet 4 is provided on the hollow chuck 1; the push rod 8 penetrates from the top of the chuck shell 9, and the head of the push rod 8 is stuck between the hollow chuck 1 and the solid chuck 7.
[0020] In this embodiment, refer to the attached Figure 1 , 2A slide groove is opened inside the hollow chuck 1, and the chuck slider 2 is installed inside the hollow chuck 1, consistent with the shape of the slide groove to form a clearance fit. A straight tooth groove is opened at the bottom of the chuck slider 2, and there are scales on the side of the chuck slider. The contact surfaces of the hollow chuck 1, the chuck slider 2 and the solid chuck 7 with the sample have anti-slip grooves.
[0021] As shown in the figure, the rotating shaft 6 is installed on the hollow chuck 1, and the axis is perpendicular to the side of the hollow chuck. A cylindrical gear is provided on the rotating shaft, which is tightly matched with the tooth groove of the chuck slider 2.
[0022] As shown in the figure, the pawl 4 is fixedly installed at the shoulder position of the rotating shaft 6 extending out of the hollow chuck through a flat key 5, and the pawl 4 rotates synchronously with the rotating shaft 6.
[0023] As shown in the figure, the stop claw 3 is installed on the side of the hollow chuck and cooperates with the ratchet 4. The stop claw 3 is inserted between the claws of the ratchet 4 to prevent the ratchet from rotating counterclockwise.
[0024] As shown in the figure, the push rod 8 is installed on the chuck support seat 9, the push rod head is stuck on the top of the hollow chuck 1 and the solid chuck 7, and the limit plate 11 is installed on the front and rear sides of the chuck shell 9 to limit the sliding of the chuck in the front and rear directions.
[0025] During the test, the tool is used in pairs to clamp the two ends of the sample respectively, and according to the thickness of the metal sheet to be stretched on both sides of the spot-welded sample, the rotating shaft 6 on the hollow chuck 1 in the two clamps is rotated clockwise to drive the chuck slider 2 to slide in the slide groove of the hollow chuck 1. The extension amount is judged according to the scale on the side of the chuck slider 2, and then the stop claw 3 is clamped into the ratchet 4 to fix the rotation of the rotating shaft 6. The chuck is driven downward by the push rod 8. Under the action of the inclined surface of the chuck shell 9, the gap between the hollow chuck 1 and the solid chuck 7 is reduced, and the sample is clamped between the two chucks. After completing the shear tensile test, the push rod 8 drives the chuck to move in the opposite direction to release the sample.
Claims
1. A metal sheet tensile test fixture, characterized in that: The invention comprises a hollow chuck (1), a chuck slider (2), a stop pawl (3), a ratchet (4), a rotating shaft (6), a solid chuck (7), a push rod (8) and a chuck shell (9). The hollow chuck (1) and the solid chuck (7) are respectively arranged inside the chuck shell (9). The chuck slider (2) is slidably connected inside the hollow chuck (1). A linear tooth groove is provided at the bottom of the chuck slider (2). The rotating shaft (6) is mounted on the hollow chuck (1). A cylindrical gear matching the linear tooth groove at the bottom of the chuck slider (2) is provided on the rotating shaft (6). The ratchet (4) is fixed to the rotating shaft (6) via a flat key (5). The hollow chuck (1) is provided with a stop pawl (3) matching the ratchet (4). The push rod (8) penetrates from the top of the chuck shell (9). The head of the push rod (8) is clamped between the hollow chuck (1) and the solid chuck (7).
2. A metal sheet tensile test fixture according to claim 1, characterized in that: Limiting plates (11) matching the hollow chuck (1) and the solid chuck (7) are respectively provided on both sides of the chuck housing (9).
3. A metal sheet tensile test fixture according to claim 2, characterized in that: Springs (10) are respectively provided between the chuck housing (9) and the hollow chuck (1) and the solid chuck (7).
4. A metal sheet tensile test fixture according to claim 3, characterized in that: The contact surfaces between the hollow chuck (1) and the solid chuck (7) and the chuck housing (9) are inclined surfaces.
5. A metal sheet tensile test fixture according to claim 1, characterized in that: The hollow chuck (1) is provided with a slide groove which matches the chuck slider (2).
6. A metal sheet tensile test fixture according to claim 1, characterized in that: The side surface of the chuck slider (2) is marked with scale.
7. A metal sheet tensile test fixture according to claim 1, characterized in that: A stop claw (3) on the hollow chuck (1) that matches the ratchet claw (4) is inserted between the claws of the ratchet claw (4).
8. The metal sheet tensile test fixture according to claim 1, characterized in that: The contact surfaces of the hollow chuck (1), the chuck slider (2) and the solid chuck (7) with the sample are provided with anti-slip grooves.