A test apparatus for forced vibration fatigue of thin metal sheets

Abstract

This utility model discloses a forced vibration fatigue testing device for thin metal sheets, belonging to the field of fatigue life testing technology for thin metal sheet materials. It addresses the problems of low vibration frequency, poor adaptability, and bulky structure in traditional testing devices. The device includes a trapezoidal impact platform base, a housing, a modular support frame, and a drive and detection mechanism. The support frame consists of an experimental support, a test piece platform, and limiting blocks, achieving rapid positioning and height adjustment of the test piece via bolts. The drive and detection mechanism includes symmetrically distributed motor and encoder assemblies. The motor drives the roller shaft via a coupling, causing the rollers to rotate at high frequency. The encoder records data in real time and provides feedback via a touchscreen. The trapezoidal base incorporates a shock-absorbing layer to improve stability, the modular structure reduces structural weight, it is adaptable to thin metal sheets of varying thicknesses, and the integrated touchscreen interface provides convenient operation. This device is suitable for high-precision fatigue life testing of ultra-thin materials such as aerospace flexible components.

Description

Technical Field

[0001] This utility model relates to the field of fatigue life testing technology for thin metal sheet materials, and in particular to a forced vibration fatigue test device for thin metal sheets. Background Technology

[0002] Metal sheets (typically 0.1-2 mm thick) are widely used as key functional materials in flexible circuit boards for electronic devices, lightweight structural components for aerospace, and substrates for miniature sensors. During service, they are continuously subjected to alternating loads, making them susceptible to fatigue failure due to accumulated cyclic stress, leading to device malfunction or even catastrophic accidents. Therefore, accurately assessing the fatigue life and failure mechanisms of metal sheets through vibration fatigue testing is crucial for improving product reliability.

[0003] Currently, most mainstream metal fatigue testing machines on the market employ hydraulic servo control systems. While these systems can perform fatigue strength tests on conventional metal samples, they face significant technical bottlenecks and limitations in experimental research on ultra-thin metal sheets. Their loading methods and frequency ranges are insufficient to accurately simulate the vibration of metal sheets under actual working conditions. The Chinese utility model patent "Ultrasonic Bending Vibration Fatigue Accelerated Testing Device for Thin Sheets," authorized by announcement number CN202285002U, discloses a device that achieves ultrasonic bending vibration fatigue loading by designing the fixed end of the thin sheet sample as a ring fitted onto a clamping screw. Although this device solves some of the problems of ultrasonic vibration loading for small-sized samples, it lacks versatility for metal sheets of different materials and thicknesses, and it is deficient in simulating vibrations under complex working conditions, causing inconvenience in testing. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a metal sheet forced vibration fatigue testing device that features high vibration frequency, simple structure, convenient operation, strong versatility, and suitability for various working conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses a forced vibration fatigue testing device for thin metal sheets, comprising a trapezoidal impact platform base, on which an integrated housing, a modular support frame device, and a drive and detection mechanism are mounted. The housing surface is equipped with a touch screen, a power switch, and an emergency stop button. The support frame device consists of a test piece platform, a limit block, and an experimental bracket, which are fixed to the trapezoidal impact platform base by bolts. The drive and detection mechanism includes symmetrically distributed motor assemblies and encoder assemblies. The motor drives a roller shaft via a coupling to rotate the roller at high frequency. The encoder is coaxially connected to the roller shaft via a coupling, recording vibration parameters in real time and transmitting them to the touch screen.

[0007] Preferably, the limiting block and the test piece platform are provided with a matching set of threaded holes, and the height can be adjusted by bolts and nuts, with an adjustment range of ±5mm, which is suitable for metal sheet test pieces with a thickness of 0.1-2mm; the test piece platform and the experimental support are rigidly connected by a set of bolts, and the bottom end of the experimental support is fixed to the trapezoidal impact platform base by welding.

[0008] Preferably, the motor assembly includes a motor pad, a motor bracket, and a motor connected in sequence, which are rigidly connected in sequence by a bolt group to ensure that the coaxiality error between the motor shaft and the roller shaft is ≤0.02mm; the encoder assembly includes an encoder pad, an encoder bracket, and an encoder, which are connected to the trapezoidal impact platform base by a bolt group, and the encoder monitors the amplitude and vibration frequency of the roller in real time.

[0009] Preferably, the touch screen integrates a PLC control system, which is connected to the motor and encoder via RS485 protocol, supports one-click setting of vibration frequency, amplitude and number of cycles, displays test data in real time and automatically generates PDF reports; the emergency stop button is linked to the overload protection circuit, and the motor is immediately powered off when triggered.

[0010] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0011] This invention features high vibration frequency, simple structure, convenient operation, strong versatility, suitability for various working conditions, and accurate detection of fatigue life of thin metal sheet materials. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the experimental device for forced vibration fatigue of metal sheets according to this utility model;

[0013] Figure 2 This is a schematic diagram of the trapezoidal impact platform base of the metal sheet forced vibration fatigue test device of this utility model;

[0014] Figure 3 This is a schematic diagram of the modular support frame structure of the metal sheet forced vibration fatigue test device of this utility model;

[0015] Figure 4 This is a schematic diagram of the drive and detection mechanism of the metal sheet forced vibration fatigue test device of this utility model;

[0016] Figure 5 This is a schematic diagram of the roller and roller shaft structure of the metal sheet forced vibration fatigue test device of this utility model;

[0017] Figure 6 This is a flowchart illustrating the operation of the experimental apparatus for forced vibration fatigue testing of thin metal sheets according to this invention.

[0018] Explanation of reference numerals in the attached drawings: 1. Trapezoidal impact platform base; 2. Housing; 3. Touch screen; 4. Encoder pad; 5. Encoder bracket; 6. Encoder; 7. Coupling; 8. Roller shaft; 9. Roller; 10. Experimental support; 11. Test piece platform; 12. Limit block; 13. Motor; 14. Motor pad; 15. Motor bracket; 16. Emergency stop button; 17. Power switch. Detailed Implementation

[0019] like Figure 1-6 As shown, a forced vibration fatigue testing device for metal sheets includes a housing 2, a modular support frame, and a drive detection mechanism placed on a trapezoidal impact platform base. A touchscreen 3, a power switch 17, and an emergency stop button 16 are sequentially mounted on the housing 2. The housing 2 contains a control system. The support frame consists of a test piece platform 11, a limit block 12, and an experimental support 10, which are fixed to the trapezoidal impact platform base by bolts. The drive detection mechanism consists of a motor pad 14, a motor support 15, a motor 13, a coupling 7, a roller shaft 8, a roller 9, an encoder pad 4, an encoder support 5, and an encoder 6. The motor pad 14 and the encoder pad 4 are fixed to the trapezoidal impact platform base by bolts.

[0020] In this embodiment, to facilitate the installation, disassembly, and adjustment of the position of the limiting block 12 and to ensure greater stability during the metal sheet material test, the limiting block 12 is connected to the test piece platform by a thread.

[0021] Specifically, the limiting block 12 and the test piece platform 11 are provided with corresponding threaded holes, which are connected by bolts and nuts. The test piece platform 11 and the test bracket 10 are provided with corresponding threaded holes. The test bracket 10 is set in the threaded holes, and the bottom end of the test bracket 10 is fixed on the trapezoidal impact platform base, making the connection more stable.

[0022] In order to adapt to different metal sheet material specimen sizes and thicknesses and to have strong versatility, the position of the limiting block 12 is set to be adjustable in this embodiment.

[0023] Specifically, the limiting block 12 is provided with threaded holes corresponding to the test piece platform 11, and is connected by bolts and nuts. By rotating the bolts and nuts, the limiting block 12 is moved, thereby adjusting the height and realizing the adjustment of the distance between the test piece and the test piece platform to adapt to the size and thickness of the metal sheet material.

[0024] In order to more accurately detect the fatigue life of thin metal sheet materials and to be suitable for various working conditions, this embodiment adopts a motor-driven method with fast response speed.

[0025] Specifically, the motor pad 14 is bolted to the corresponding threaded hole on the trapezoidal impact platform base, the motor bracket 15 is bolted to the corresponding threaded hole on the motor pad 14, the motor 13 is bolted to the corresponding threaded hole on the motor bracket 15, and the motor output shaft is connected to the roller shaft 8 through the coupling 15. When the motor drives the roller shaft to rotate, the roller shaft drives the roller to rotate.

[0026] In this embodiment, the fatigue life test of the metal sheet material can be controlled by operating the touch screen 3, power switch 17 and emergency stop button 19 on the housing 2. The test results can be displayed intuitively on the touch screen 3. The device is complete and does not require an external computer. It is simple and convenient to operate.

[0027] Specifically, the touch screen 3, power switch 17, and emergency stop button 19 are connected to the CPU via signal lines. When the power switch 17 is turned on, the entire device is powered on. Test parameters can be set directly on the touch screen 3, and test data can also be displayed directly on the touch screen 3 for observation of the test situation. If a fault occurs during the test, the emergency stop button 19 can be pressed to stop the test immediately.

[0028] This embodiment is simple and effective in avoiding the complex and error-prone operation during the experiment, thus effectively improving the efficiency of the experiment.

[0029] The operation process of this utility model is as follows:

[0030] In this patent, the thin metal sheet material refers to air pump spring sheets, flexible circuit boards in electronic devices, and lightweight structural components in the aerospace field. First, adjust the position of the limiting block 12, install the test piece on the test piece platform 11, turn on the power switch 17 on the housing 2 to power the entire device, set the test parameters, and use the encoder 6 to set the test speed and amplitude. After setting the test parameters, click the start button on the touch screen 3, and the rollers will begin reciprocating rotation, starting the test. During the test, data such as the number of rotations, rotation time, and rotation speed can be directly displayed on the touch screen 3. When the set data is reached, the test automatically stops, the test data is recorded, and the specimen fracture condition is checked. If no cracks appear on the specimen, the parameters can be adjusted to continue the test.

[0031] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A test apparatus for forced vibration fatigue of thin metal sheets, characterized in that: The device includes a trapezoidal impact platform base (1), on which a housing (2), a modular support frame device, and a drive detection mechanism are integrated; the housing (2) is equipped with a touch screen (3), a power switch (17), and an emergency stop button (16) on its surface; the support frame device consists of a test piece platform (11), a limit block (12), and an experimental bracket (10), which are fixed to the trapezoidal impact platform base (1) by bolts; the drive detection mechanism includes a symmetrically distributed motor assembly and an encoder assembly, wherein the motor (13) drives the roller shaft (8) through a coupling (7) to drive the roller (9) to perform high-frequency reciprocating rotation, and the encoder (6) is coaxially connected to the roller shaft (8) through a coupling to record vibration parameters in real time and transmit them to the touch screen (3).

2. The experimental apparatus for forced vibration fatigue testing of metal sheets according to claim 1, characterized in that: The limiting block (12) and the test piece platform (11) are provided with a matching threaded hole group, and the height can be adjusted by bolts and nuts. The adjustment range is ±5mm, which is suitable for metal sheet test pieces with a thickness of 0.1-2mm. The test piece platform (11) and the experimental support (10) are rigidly connected by bolt group, and the bottom end of the experimental support (10) is fixed to the trapezoidal impact platform base (1) by welding.

3. The experimental apparatus for forced vibration fatigue testing of metal sheets according to claim 1, characterized in that: The motor assembly includes a motor pad (14), a motor bracket (15), and a motor (13) connected in sequence. The three are rigidly connected in sequence by bolts to ensure that the coaxiality error between the motor shaft and the roller shaft (8) is ≤0.02mm. The encoder assembly includes an encoder pad (4), an encoder bracket (5), and an encoder (6), which are connected to the trapezoidal impact platform base (1) by bolts. The encoder (6) monitors the amplitude and vibration frequency of the roller (9) in real time.

4. The experimental apparatus for forced vibration fatigue testing of metal sheets according to claim 1, characterized in that: The touch screen (3) integrates a PLC control system and is connected to the motor (13) and encoder (6) via RS485 protocol. It supports one-click setting of vibration frequency, amplitude and number of cycles, and displays test data in real time and automatically generates PDF reports. The emergency stop button (16) is linked with the overload protection circuit. When triggered, the motor (13) is immediately powered off.

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