A detection tool for detecting tensile strength of a part

Abstract

The application relates to the rivet test technical field, and particularly discloses a detection tool for detecting the tensile strength of a part, which comprises a cylindrical base, a first clamping layer plate and a second clamping layer plate. The base is provided with a groove in the center, the groove is provided with an avoiding groove at the bottom, the back is provided with an installation groove in communication with the avoiding groove, and four pressing columns with fixing holes are arranged at the periphery of four sides. The first clamping layer plate is a square structure, is provided with a rivet hole in the center, and is provided with four insertion holes at four corners and connected with the fixing holes of the pressing columns of the base through insertion columns. The second clamping layer plate is additionally provided with a center counterbore groove on the basis of the first clamping layer plate, and the two clamping layer plates can be combined and embedded into the groove of the base. Rubber sleeves are arranged on the outer walls of the insertion columns to enhance the connection stability, and the installation groove of the base is provided with a cover plate with a top rod. The patent aims to solve the problems of scattered functions and redundant equipment of the existing test device. The detection tool is mainly used for detecting the tensile strength and core rod ejection force of a core-pulling rivet.

Description

Technical Field

[0001] This utility model relates to the field of rivet testing technology, and in particular to a testing fixture for detecting the tensile strength of parts. Background Technology

[0002] With the rapid development of new energy vehicles, aerospace and other fields, the demand for comprehensive performance testing of blind rivets, as key connecting components, is becoming increasingly urgent. Currently, the mechanical performance testing of blind rivets mainly includes indicators such as tensile strength and mandrel ejection force. However, existing technologies mostly use dedicated tooling or equipment with single functions to complete different tests separately, which has problems such as functional dispersion, cumbersome operation and resource waste, and is difficult to meet the needs of efficient and integrated testing.

[0003] Taking existing technologies as an example, the utility model patent CN211504484 U discloses a tooling for detecting the top force of a rivet core rod, which can adapt to different rivets by changing the rivet parts, but its function is limited and it depends on specific structural components; CN218956275U discloses a tooling for testing the tensile strength of a threaded hollow rivet, which can simulate the tensile condition of a threaded hollow rivet, but it is only for a single test type, so its scope of application is limited.

[0004] Existing technologies employing multiple devices for experiments suffer from high space requirements, high maintenance costs, and frequent tooling changes or equipment adjustments significantly increase operational complexity, resulting in low efficiency. In high-precision manufacturing fields such as new energy battery housings or aerospace structural components, multi-dimensional mechanical verification of pull rivets is required, but existing technologies struggle to provide an integrated solution. Therefore, there is an urgent need to design a multi-functional integrated testing device capable of comprehensively testing tensile strength and mandrel ejection force on a single platform, thereby improving testing efficiency and reducing costs. Utility Model Content

[0005] To address the shortcomings of existing technologies, the present invention provides a testing fixture for detecting the tensile strength of parts, thus resolving the issues of functional dispersion and equipment redundancy in existing testing devices.

[0006] To solve the above problems, the technical solution adopted by this utility model is: a testing fixture for detecting the tensile strength of parts, including a symmetrical base assembly and a testing assembly;

[0007] The symmetrical base assembly includes a first base and a second base with identical structures. Each base is provided with four pressure columns, and each pressure column has a fixing hole at its center.

[0008] The pressure column ends of the first base and the second base are arranged facing each other, and are rotated relative to each other by 45° with respect to the axial center line of the base;

[0009] The first base and the second base shown have grooves at their centers, and a through hole is provided in the center of the groove along the axial direction, with a push rod inside the through hole;

[0010] The test assembly includes a first sandwich panel and a second sandwich panel. Both sandwich panels are square in shape and have a rivet hole in the center. The four corners of the sandwich panels have insertion holes that are compatible with the fixing holes of the base. The two sandwich panels are riveted together by the core-pulling rivet to be tested.

[0011] The first sandwich panel and the second sandwich panel are staggered, and the angle between the diagonal of the first sandwich panel and the diagonal of the second sandwich panel is 45°.

[0012] The pressure post fixing hole and the test component insertion hole are connected by independent insertion posts.

[0013] Compared with existing technologies, the beneficial effects of this solution are: through the design of symmetrical base components and test components, this application can perform tensile strength testing and core rod top force testing using the same tooling, reducing the number of dedicated tooling and avoiding the need to purchase equipment repeatedly.

[0014] Furthermore, a rubber sleeve is fitted onto the plug, with the outer wall of the rubber sleeve in tight contact with the inner wall of the corresponding plug hole. The rubber sleeve increases the friction of the contact surface, preventing the plug from slipping or deflecting due to external forces during testing.

[0015] Furthermore, a clearance groove is provided at one end of the through hole near the center of the base groove, and a mounting groove is provided at the other end of the through hole. The clearance groove is used to prevent the head of the pop rivet from colliding with the base, and a cover plate is fitted inside the mounting groove to increase the force-bearing area of ​​the push rod.

[0016] Furthermore, a cover plate is fitted inside the mounting groove of the base, the cover plate is fixedly connected to the top rod, and the surface of the cover plate has anti-slip texture. Attached Figure Description

[0017] Figure 1 The base structure of this application Figure 1 .

[0018] Figure 2 The base structure of this application Figure 2 .

[0019] Figure 3 This is a top view of the base of this application.

[0020] Figure 4 For along Figure 3 A three-dimensional cross-sectional view of section 1-1.

[0021] Figure 5 This is a structural diagram of the first sandwich panel of this application.

[0022] Figure 6This is a structural diagram of the second sandwich panel of this application.

[0023] Figure 7 This is a structural diagram of the first usage method of this application.

[0024] Figure 8 This is a diagram of the sandwich panel connection structure for the first usage method of this application.

[0025] Figure 9 For along Figure 8 Three-dimensional cross-sectional view of section 2-2.

[0026] Figure 10 This is a structural diagram of the second usage method of this application.

[0027] Figure 11 This is a diagram of the sandwich panel connection structure for the second usage method of this application.

[0028] Figure 12 For along Figure 11 A three-dimensional cross-sectional view of section 3-3.

[0029] The reference numerals in the accompanying drawings include: 1. base; 11. groove; 12. clearance groove; 13. mounting groove; 14. through hole; 15. pressure post; 151. fixing hole; 2. first sandwich plate; 3. second sandwich plate; 31. countersunk groove; 4. cover plate; 5. rivet hole; 6. insertion hole. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method:

[0031] As attached Figure 1-6 As shown, the specific structure of this utility model is as follows:

[0032] A testing fixture for detecting the tensile strength of a part includes a symmetrical base assembly and a testing assembly;

[0033] The symmetrical base assembly includes a first base 1 and a second base 1 with identical structures. Each base 1 is provided with four pressure columns 15, and each pressure column 15 has a fixing hole 151 in the center.

[0034] The ends of the pressure column 15 of the first base 1 and the second base 1 are arranged facing each other, and are rotated relative to each other by 45° with the axial center line of the base 1 as a reference.

[0035] The first base 1 and the second base 1 shown are provided with a groove 11 at their center. The groove 11 is provided with a through hole 14 in the axial direction at its center. A top rod is provided in the through hole 14.

[0036] The test assembly includes a first sandwich panel 2 and a second sandwich panel 3. Both sandwich panels are square in shape and have a rivet hole 5 in the center. The four corners of the sandwich panels have insertion holes 6 that are adapted to the fixing holes 151 of the base 1. The two sandwich panels are riveted together by the core-pulling rivet to be tested.

[0037] The first sandwich panel 2 and the second sandwich panel 3 are staggered, and the angle between the diagonal of the first sandwich panel 2 and the diagonal of the second sandwich panel 3 is 45°.

[0038] The fixing hole 151 of the pressure post 15 and the insertion hole 6 of the test component are connected by a socket through an independent insertion post (not shown in the figure).

[0039] Furthermore, a rubber sleeve is fitted onto the plug post, and the outer wall of the rubber sleeve is in tight contact with the inner wall of the corresponding plug hole 6.

[0040] Furthermore, the through hole 14 is provided with an avoidance groove 12 at one end near the center of the groove 11 of the base 1, and an installation groove 13 at the other end of the through hole 14.

[0041] Furthermore, a cover plate 4 is adapted to be installed in the mounting groove 13 of the base 1. The cover plate 4 is fixedly connected to the top rod, and the surface of the cover plate 4 has anti-slip texture.

[0042] Furthermore, a countersunk groove 31 is provided at the center of the second sandwich plate 3 to accommodate the protruding part of the head end of the pull rivet.

[0043] As attached Figure 7-9 As shown, the first sandwich panel 2 and the second sandwich panel 3 are staggered, with the diagonal of the first sandwich panel 2 forming a 45° angle with the diagonal of the second sandwich panel 3. The blind rivet to be tested is installed in the rivet hole 5, with the bulging end of the blind rivet facing upwards, facilitating observation of changes in the bulge during tooling testing. The head end of the blind rivet is placed in the countersunk groove 31 of the second sandwich panel 3 to prevent the rivet head from protruding from the surface, ensuring the surface flatness of the sandwich panel. The ends of the pressure posts 15 of the first base 1 and the second base 1 are set facing each other, and rotated 45° relative to each other with the axial center line of the base 1 as a reference, so that the fixing hole 151 on the pressure post 15 of the base 1 is aligned with the insertion hole 6 on the connected sandwich panel, and connected through the insertion post. To prevent the insertion post from slipping or deflecting due to external force during testing, a rubber sleeve is fitted on the insertion post, completing the tooling installation. The tooling is then placed on the testing machine, and pressure is applied to the base 1 through the testing machine. The pressure is transmitted to the sandwich panel through the pressure column 15. The core-pulling rivets connecting the sandwich panel finally bear the tensile force and are subjected to a tensile test.

[0044] As attached Figure 10-12As shown, the first sandwich panel 2 and the second sandwich panel 3 are stacked, with the diagonal of the first sandwich panel 2 and the diagonal of the second sandwich panel 3 forming an angle of 0°. The core-pulling rivet to be tested is installed in the rivet hole 5. The connected sandwich panels are placed in the groove 11 of the lower base 1. The ends of the pressure columns 15 of the first base 1 and the second base 1 are set facing each other, and rotated relative to each other by 45° with the axial center line of the base 1 as the reference, so that the through hole 14 of the first base 1, the through hole 14 of the second base 1 and the core rod of the core-pulling rivet to be tested are on a straight line. The top rod with the cover plate 4 is placed into the through hole 14, so that the cover plate 4 protrudes a part of the mounting groove 13. The cover plate 4 increases the force-bearing area of ​​the top rod, and the surface of the cover plate 4 has anti-slip texture to prevent the top rod from slipping during the test, thus completing the installation of the tooling. Next, the tooling is placed on the testing machine, and pressure is applied to the cover plate 4 by the testing machine. The pressure is transmitted to the push rod through the cover plate 4, and the push rod transmits the force to the core rod of the pull rivet, causing the core rod of the pull rivet to be pushed out. The testing equipment can collect the value of the push force of the core rod through the pressure sensor.

[0045] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A testing fixture for detecting the tensile strength of a part, comprising a symmetrical base assembly and a testing assembly, wherein the symmetrical base assembly includes a first base and a second base with identical structures, each base having four pressure posts, each pressure post having a fixing hole at its center; the pressure post ends of the first base and the second base are arranged facing each other and rotated relative to each other by 45° with respect to the axial centerline of the base, characterized in that: The first and second bases shown have grooves at their centers, and through holes extending through the bases along the axial direction at the center of the grooves. A top rod is installed within the through holes. The test assembly includes a first sandwich panel and a second sandwich panel, both square in shape with rivet holes at their centers. The four corners of each sandwich panel have insertion holes that match the fixing holes of the bases. The two sandwich panels are riveted together using the pull-out rivets to be tested. The first and second sandwich panels are staggered, with the diagonal of the first sandwich panel forming a 45° angle with the diagonal of the second sandwich panel. The pressure post fixing holes and the test assembly insertion holes are connected by independent insertion posts.

2. The testing fixture for detecting the tensile strength of a part according to claim 1, characterized in that: A rubber sleeve is fitted onto the plug, and the outer wall of the rubber sleeve is in tight contact with the inner wall of the corresponding plug hole.

3. The testing fixture for detecting the tensile strength of a part according to claim 1, characterized in that: The through hole has an avoidance groove at one end near the center of the base groove, and an installation groove at the other end of the through hole.

4. The testing fixture for detecting the tensile strength of a part according to claim 1, characterized in that: The base mounting slot is fitted with a cover plate, which is fixedly connected to the top rod, and the surface of the cover plate has anti-slip texture.

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