Hot bath friction test device

Abstract

The utility model relates to the technical field of friction testing machines, in particular to a hot bath friction testing device which comprises a driving mechanism, the driving mechanism is connected with a sample fixing piece, and a second force sensor is arranged on the driving mechanism; the test box is arranged below the sample fixing piece, and a sample opening for a sample to pass through is formed in a top plate of the test box; a solution tank is arranged in the test box, and a heating pipe is arranged in the solution tank; a friction mechanism is further installed in the solution tank and comprises two friction blocks which are oppositely arranged, the friction blocks are connected with an oil cylinder through a friction block fixing frame, and the oil cylinder is installed on the inner side wall of the test box and used for driving the friction blocks to stretch out and draw back in the horizontal direction. A first force sensor is arranged between the friction block fixing frame of at least one friction block and the oil cylinder. The utility model solves the problem that the existing device can not carry out friction test on plates and the like under the hot bath working condition, and provides accurate and effective support for the fields of hot bath forming process, hot bath friction research and the like.

Description

Technical Field

[0001] This utility model relates to the field of friction testing machine technology, specifically to a hot bath friction testing device. Background Technology

[0002] Thermoforming is a process in which materials are heated to a certain temperature and then shaped. Compared with cold forming, thermoforming has significant advantages, better meeting the forming requirements of complex parts. It also reduces the external force required for forming, lightens equipment load, and improves material properties, resulting in products with superior strength and toughness. However, in thermoforming, the significant temperature difference between the sheet metal and the die, and the drastic temperature changes in the sheet metal, make the friction behavior between them more complex. This complex friction condition affects the forming quality of the sheet metal and the life of the die, requiring careful attention and research in practical applications.

[0003] Chinese invention patent application CN 112798454 A discloses a testing system for the friction and wear behavior of thin metal sheets under hot forming conditions, including a frame assembly, a clamping assembly, a heating assembly, a tensile device, and a force sensor. The tensile device is installed at the bottom of the thin metal sheet, the clamping assembly is installed at the top of the thin metal sheet, and the middle of the thin metal sheet is installed in the heating assembly, which is located within the frame assembly. The heating assembly is a resistance heating furnace. In use, the sample is first clamped in the clamping component of the tensile device and placed in the resistance heating furnace to be heated to the target temperature and allowed to stabilize. Then, the sample is clamped using a fixture to perform a sliding friction and wear test. Therefore, this system can effectively reproduce the high-temperature friction and wear behavior under complex temperature paths during the hot forming process of thin metal sheets, providing technical support for testing the high-temperature friction and wear behavior of thin-walled metal components during hot forming.

[0004] Currently, many companies are beginning to research and adopt hot bath forming technology for processing sheet metal. This process involves placing heated sheet metal into a medium at a certain temperature, and then applying external force to the heated sheet metal through molds or other forming devices to cause plastic deformation, thereby obtaining the desired shape. However, existing friction testing equipment is mainly suitable for normal or high-temperature heating conditions, and there is currently no device capable of simulating a hot bath environment and conducting friction tests. Utility Model Content

[0005] To address the current technical problem of the lack of devices capable of simulating a hot bath environment and conducting friction tests, this utility model provides a hot bath friction test device.

[0006] The technical solution of this utility model is as follows:

[0007] A hot bath friction testing device includes a drive mechanism connected to a sample holder and used to drive the sample holder to move up and down. A second force sensor is provided on the drive mechanism. It also includes a test chamber located below the sample holder, with a sample opening on the top plate for the sample to pass through. A solution tank is provided inside the test chamber, and a heating tube is installed inside the solution tank. A friction mechanism is also installed inside the solution tank, comprising two opposing friction blocks. Each friction block is connected to a hydraulic cylinder via a friction block mounting bracket. The hydraulic cylinder is mounted on the inner wall of the test chamber and is used to drive the friction blocks to extend and retract horizontally. A first force sensor is provided between the friction block mounting bracket of at least one friction block and the hydraulic cylinder.

[0008] Furthermore, the drive mechanism includes a drive motor, which is connected to a lead screw via a reducer. The lead screw is vertically positioned and has a connecting block fitted on it. The sample holder is mounted on the bottom of the connecting block via a guide rod. The drive motor can drive the lead screw to rotate and move the sample holder up and down along the lead screw.

[0009] Furthermore, the driving mechanism includes a hydraulic device, the output end of which is connected to the sample holder via a guide rod, and the hydraulic device can drive the sample holder to move up and down.

[0010] Furthermore, the hot bath friction testing apparatus includes a frame, and a drive mechanism is mounted on the frame.

[0011] Furthermore, the guide rod consists of two interlocking connecting rods, with the second force sensor sandwiched between the two connecting rods.

[0012] Furthermore, the sample holder is a clamp or a hook.

[0013] Furthermore, a temperature sensor is installed inside the solution tank. The temperature sensor is connected to a controller, which is in turn connected to the heating element.

[0014] Furthermore, the first force sensor and the second force sensor are respectively connected to the controller signal.

[0015] Furthermore, both the first and second force sensors are equipped with digital displays. These displays can directly show the data measured by the force sensors, allowing test personnel to observe the data in real time at the test site without the need for additional equipment, thus improving the convenience of test operations. They also enable the timely detection of data anomalies, ensuring the smooth progress of the test.

[0016] Furthermore, the top plate of the test chamber is equipped with a slide rail, and the upper surface of each friction block fixing frame is equipped with a slider, which is slidably connected to the slide rail.

[0017] The beneficial effects of this utility model are as follows:

[0018] The hot bath friction testing device provided by this utility model solves the technical problem that existing friction testing devices cannot test and inspect sheet metal and other materials under hot bath conditions. This device heats the medium in the solution tank using heating pipes to simulate the working conditions, then completes the friction test under hot bath conditions. Finally, it collects the friction test data through sensors, ensuring the accuracy and effectiveness of the hot bath friction test data, and providing accurate and effective support for fields such as hot bath forming processes and hot bath friction research. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the hot bath friction test device in Example 1 of the specific implementation method.

[0021] Figure 2 This is a schematic diagram of the test chamber in the hot bath friction test apparatus of Example 2 in the specific implementation method.

[0022] Figure 3 This is a schematic diagram of the hot bath friction test device in Example 2 of the specific implementation.

[0023] In the figure, 1-base, 2-frame, 3-ball screw, 4-connecting block, 5-sample fixing piece, 6-second force sensor, 7-test chamber, 8-solution tank, 9-heating tube, 10-friction block, 11-friction block fixing frame, 12-oil cylinder, 13-first force sensor, 14-slide rail, 15-slider, 16-hydraulic device. Detailed Implementation

[0024] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0025] Example 1

[0026] A hot bath friction testing device includes a base 1, on which a frame 2 is mounted. The frame 2 includes two vertically arranged support columns and a crossbeam connecting one support column to each end. One support column of the frame 2 is a hollow support column, and a vertical ball screw 3 is installed inside the hollow support column. One end of the ball screw 3 is connected to a drive motor via a reducer. A connecting block 4 is fitted onto the ball screw 3, and the connecting block 4 is threadedly connected to the ball screw 3. A first vertical groove is formed on the side wall of the hollow support column, and a second vertical groove is formed at the corresponding position on the other support column of the frame 2. Block 4 extends from the hollow support column through the first vertical groove, and the extended end of the connecting block 4 can slide up and down in the second vertical groove. The second vertical groove can limit the connecting block 4 to a certain extent and reduce the shaking during the test. The sample fixing part 5 (e.g., hook) is installed at the bottom of the connecting block 4 through the guide rod. The guide rod consists of two connecting rods that are connected to each other. A second force sensor 6 is sandwiched between the two connecting rods. The drive motor is equipped with a reducer, which can accurately control the speed to ensure that the ball screw 3 rotates smoothly, so that the sample fixing part 5 can move stably downward or upward along the ball screw 3.

[0027] The hot bath friction testing apparatus also includes a test chamber 7, which is mounted on a base 1 and located below the sample fixing component 5. The top plate of the test chamber 7 has a sample opening for the sample to be tested to pass through. Inside the test chamber 7 is a solution tank 8, which holds the hot bath medium. The hot bath medium can enter through an opening at the top of the solution tank 8, or a medium inlet can be provided at the top of the solution tank 8 for injecting the hot bath medium. A medium outlet is provided at the bottom of the solution tank 8 for easy discharge of the hot bath medium. Inside the solution tank 8 are heating pipes 9 and a temperature sensor, which monitors the temperature of the medium contained in the solution tank 8. A friction mechanism is also installed inside the solution tank 8. The structure includes two friction blocks 10 arranged opposite each other. The outer surface shapes of the two friction blocks 10 can be different. One of them has a platform-shaped outer protrusion, and the other has a semi-cylindrical outer protrusion. Each friction block 10 is connected to a hydraulic cylinder 12 through a friction block fixing frame 11. The hydraulic cylinder 12 is installed on the inner wall of the test chamber 7. The hydraulic cylinder 12 is used to drive the friction block 10 to extend and retract in the horizontal direction. During extension and retraction, a part of the friction block fixing frame 11 will pass through the side wall of the solution tank 8. Therefore, this position needs to be sealed to prevent the hot medium in the solution tank 8 from leaking out from the gap. A first force sensor 13 is provided between the friction block fixing frame 11 and the hydraulic cylinder 12 of at least one friction block 10.

[0028] A slide rail 14 is provided on the top plate of the test chamber 7, and a slider 15 is provided on the upper surface of each friction block fixing frame 11. The slider 15 is slidably connected to the slide rail 14. The cooperation between the slide rail 14 and the slider 15 makes the friction block 10 move more smoothly and steadily during horizontal extension and contraction, reduces the shaking of the friction block 10 when moving, and ensures stable contact between the friction block 10 and the sample, thereby improving the accuracy and consistency of the friction force in the hot bath friction test.

[0029] The method of using the hot bath friction testing device in this embodiment is as follows:

[0030] A medium, such as distilled water, is added to the solution tank 8 until the liquid level covers the friction mechanism. The medium is then heated using heating pipe 9. Simultaneously, the sheet metal sample to be tested is heated in a heating furnace. The heating temperature of both the medium and the sheet metal can be determined based on the simulated actual working conditions.

[0031] After the temperatures of both the medium and the sheet metal reach the set temperatures, the sheet metal sample is fixed on the sample holder 5. The drive motor is started, and under the action of the drive motor, the sample holder 5 descends along the ball screw 3, allowing the sheet metal sample to enter the hot medium in the solution tank 8 through the sample opening on the top plate of the test chamber 7. Then, the hydraulic cylinder 12 is started, causing the two friction blocks 10 to move towards and contact the sheet metal sample. Next, the drive motor is started again, rotating in the opposite direction, causing the sample holder 5 to move upward, stretching the sheet metal sample and completing the thermal friction test. The first force sensor 13 collects the normal force (i.e., the force perpendicular to the contact surface) F1, and the second force sensor 6 collects the tensile force F. When the object is about to start moving, the second force sensor 6 records the maximum tensile force (i.e., static friction force) as F2. When the object enters a stable motion state, the second force sensor 6 records the average tensile force (i.e., dynamic friction force) as f2. Since both sides of the sample are in contact with the friction mechanism, according to the definition of the coefficient of friction, the static friction coefficient μ 静 and the coefficient of kinetic friction μ 动 It can be calculated using the following formula:

[0032] μ 静 =F2 / 2F1;

[0033] μ 动 =f2 / 2F1.

[0034] Example 2

[0035] Based on Example 1, Example 2 provides a hot bath friction testing device. The difference between Example 2 and Example 1 lies in the use of a different driving mechanism to achieve the raising or lowering of the sample. The specific structure of Example 2 is as follows:

[0036] A hot bath friction test device includes a base 1, on which a frame 2 is mounted. The frame 2 includes two vertically arranged support columns and a crossbeam with one support column connected to each end. A hydraulic device 16 is mounted on the crossbeam. The output end of the hydraulic device 16 is connected to a sample fixing member 5 (e.g., a hook) through a guide rod. The guide rod consists of two interlocking connecting rods. A second force sensor 6 is sandwiched between the two connecting rods. The hydraulic device 16 can drive the sample fixing member 5 to move up and down.

[0037] The hot bath friction testing apparatus also includes a test chamber 7, which is mounted on a base 1 and located below the sample fixing component 5. The top plate of the test chamber 7 has a sample opening for the sample to be tested to pass through. Inside the test chamber 7 is a solution tank 8, which holds the hot bath medium. The hot bath medium can enter through an opening at the top of the solution tank 8, or a medium inlet can be provided at the top of the solution tank 8 for injecting the hot bath medium. A medium outlet is provided at the bottom of the solution tank 8 for easy discharge of the hot bath medium. Inside the solution tank 8 are heating pipes 9 and a temperature sensor, which monitors the temperature of the medium contained in the solution tank 8. A friction mechanism is also installed inside the solution tank 8. The structure includes two friction blocks 10 arranged opposite each other. The outer surface shapes of the two friction blocks 10 can be different. One of them has a platform-shaped outer protrusion, and the other has a semi-cylindrical outer protrusion. Each friction block 10 is connected to a hydraulic cylinder 12 through a friction block fixing frame 11. The hydraulic cylinder 12 is installed on the inner wall of the test chamber 7. The hydraulic cylinder 12 is used to drive the friction block 10 to extend and retract in the horizontal direction. During extension and retraction, a part of the friction block fixing frame 11 will pass through the side wall of the solution tank 8. Therefore, this position needs to be sealed to prevent the hot medium in the solution tank 8 from leaking out from the gap. A first force sensor 13 is provided between the friction block fixing frame 11 and the hydraulic cylinder 12 of at least one friction block 10.

[0038] A slide rail 14 is provided on the top plate of the test chamber 7, and a slider 15 is provided on the upper surface of each friction block fixing frame 11. The slider 15 is slidably connected to the slide rail 14. The cooperation between the slide rail 14 and the slider 15 makes the friction block 10 move more smoothly and steadily during horizontal extension and contraction, reduces the shaking of the friction block 10 when moving, and ensures stable contact between the friction block 10 and the sample, thereby improving the accuracy and consistency of the friction force in the hot bath friction test.

[0039] Example 3

[0040] Based on Examples 1 and 2, Example 3 further optimizes and improves the hot bath friction test device.

[0041] In a preferred embodiment, the hot bath friction test apparatus also includes a controller. A temperature sensor inside the solution tank 8 is connected to the controller via a signal connection, and the controller is connected to the heating tube 9 via a control connection. The temperature sensor monitors the temperature of the medium inside the solution tank 8 in real time and feeds the data back to the controller. The controller precisely adjusts the operation of the heating tube 9 according to the set temperature to ensure that the temperature inside the solution tank 8 is stable at the hot bath temperature required for the test, ensuring the accuracy of the hot bath operating condition simulation and providing a stable temperature environment for the hot bath friction test.

[0042] In a preferred embodiment, the first force sensor 13 and the second force sensor 6 of this embodiment can be connected to a controller, which can be a computer device. The computer device can receive data collected by the first force sensor 13 and the second force sensor 6 in real time, store and display the test data, and calculate the friction coefficient based on the data collected by the first force sensor 13 and the second force sensor 6 using known friction coefficient formulas and / or existing professional software. This allows technicians to intuitively obtain test results and provides efficient data processing support for hot bath friction research.

[0043] As a preferred embodiment, digital displays can also be configured on the first force sensor 13 and the second force sensor 6 respectively. The digital displays can directly display the data measured by the force sensors, which is convenient for technicians to observe in real time at the test site without the need for additional equipment to read the data, thus improving the convenience of test operation. At the same time, it can promptly detect data anomalies and ensure the smooth progress of the test.

[0044] As a preferred embodiment, in order to effectively reduce the loss of heat from the medium to the external environment during the test and avoid the impact on the accuracy of the test results, an insulation layer can be provided on the side wall of the test chamber 7 or the solution tank 8 to maintain the stability of the medium temperature and improve the reliability of the test data.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot bath rub test apparatus comprising a drive mechanism, characterised in that, The drive mechanism is connected to the sample holder and is used to drive the sample holder to move up and down. A second force sensor is provided on the drive mechanism. The test chamber is located below the sample holder and has a sample opening on its top plate for the sample to pass through. A solution tank is provided inside the test chamber, and a heating tube is installed inside the solution tank. A friction mechanism is also installed inside the solution tank. The friction mechanism includes two friction blocks arranged opposite each other. Each friction block is connected to a hydraulic cylinder through a friction block fixing frame. The hydraulic cylinder is installed on the inner side wall of the test chamber and is used to drive the friction block to extend and retract in the horizontal direction. A first force sensor is provided between the friction block fixing frame of at least one friction block and the hydraulic cylinder.

2. A hot bath rub test apparatus as claimed in claim 1, wherein The drive mechanism includes a drive motor, which is connected to a lead screw via a reducer. The lead screw is vertically positioned and has a connecting block fitted on it. The sample holder is installed at the bottom of the connecting block via a guide rod.

3. A hot bath rub test apparatus as claimed in claim 1, wherein The drive mechanism includes a hydraulic device, the output end of which is connected to the sample holder via a guide rod.

4. A hot bath rub test apparatus as claimed in any one of claims 1 to 3, wherein, The hot bath friction test apparatus includes a frame, and the drive mechanism is mounted on the frame.

5. A hot bath rub test apparatus as claimed in any one of claims 1 to 3, wherein, The sample holder is either a clamp or a hook.

6. A hot bath rub test apparatus as claimed in claim 2 or claim 3, wherein, The guide rod consists of two interlocking connecting rods, with the second force sensor sandwiched between the two connecting rods.

7. A hot bath rub test apparatus as claimed in claim 1, wherein A temperature sensor is also installed in the solution tank. The temperature sensor is connected to a controller, which is connected to the heating tube.

8. The hot bath friction testing apparatus as described in claim 7, characterized in that, The first force sensor and the second force sensor are respectively connected to the controller signal.

9. A hot bath rub test apparatus as claimed in claim 1 wherein, Both the first force sensor and the second force sensor are equipped with digital display screens.

10. A hot bath rub test apparatus as claimed in claim 1, wherein, The top plate of the test chamber is equipped with a slide rail, and the upper surface of each friction block fixing frame is equipped with a slider, which is slidably connected to the slide rail.

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