An inner hole coating bonding strength detection device

Abstract

An inner hole coating bonding strength detection device of the present invention belongs to the field of inner hole coating detection; it includes a test component, a control component for controlling the test component, and a signal transmission component for transmitting test results; the product to be tested is fixed on the test bench through a positioning fixture; the test component is extended into the inner hole of the product to be tested through the control component to control the scribing trajectory, scribing position and scribing pressure of the test component; the test signal of the test component during the test is obtained through the signal transmission component and transmitted to the control component for display to assist the human-machine interaction during the test. The present invention solves the problems of low detection accuracy of the existing technology for inner hole coatings and the inability to quantitatively analyze the differences in bonding strength caused by different process parameters.

Description

Technical Field

[0001] The present invention belongs to the field of inner hole coating detection, and particularly relates to a device for detecting the bonding strength of an inner hole coating. Background Art

[0002] The service environment of inner hole parts is relatively harsh, often causing various forms and degrees of damage to the inner wall, leading to the failure of parts, posing safety hazards, and greatly increasing the engineering cost. Therefore, strengthening the surface of the inner hole of parts and enhancing their wear resistance, corrosion resistance and other properties is an important topic in the current engineering field. Metal material surface strengthening technologies include surface modification technology, surface alloying technology, surface conversion film technology, surface coating technology, etc. Among them, surface coating technology refers to forming a coating on the substrate surface by physical and chemical methods to strengthen the performance of parts. Compared with other methods, surface coating technology does not damage the shape and performance of the parts themselves, the formed protective layer is thicker, and the application range is wider. It is the main means of inner hole strengthening now.

[0003] The main failure form of the coating is the peeling and falling off of the coating material from the substrate due to insufficient adhesion. Therefore, the coating bonding strength is a key index for evaluating the performance of the sprayed coating. At present, the bonding strength of the coating is mainly detected by the scratch method. The basic principle of the scratch method is to gradually apply force on the coating surface with a hard tool to produce scratches and observe the response of the coating. As the applied load increases, the coating may suffer different forms of damage, such as scratches, peeling, falling off, etc. According to the failure mode and load value of the coating under different loads, the bonding strength between the coating and the substrate is evaluated. The existing scratch testers are mainly used to test the bonding strength of the coatings on flat parts and are not suitable for detecting the bonding strength of the inner hole coatings of cylindrical parts. It is often necessary to cut the cylindrical parts into small specimens, but it is difficult to cut small-sized parts, and cutting will affect the performance of the coating. At the same time, the coating will be affected by force and heat during the cutting process, resulting in changes in performance and inaccurate detection.

[0004] At present, the detection method of inner hole coatings generally relies only on the visual method, which has poor accuracy and cannot quantitatively analyze the differences in bonding strength caused by different process parameters. Therefore, the present invention designs a device for detecting the bonding strength of inner hole coatings, which can directly detect the bonding strength of the inner hole coatings of cylindrical parts, simplify the detection steps, improve the detection accuracy, and provide a data basis for optimizing the spraying process. Summary of the Invention

[0005] Technical Problems to be Solved:

[0006] To avoid the deficiencies of the prior art, the present invention provides a device for detecting the bonding strength of an inner hole coating. The testing part of the testing component is extended into the inner hole, and the position, scribing trajectory, and applied pressure intensity of the testing part are controlled by the driving part to achieve the testing of different pressure intensities of the inner hole coating. The present invention solves the problems of low detection accuracy of the prior art for inner hole coatings and the inability to quantitatively analyze the differences in bonding strength caused by different process parameters.

[0007] The technical solution of the present invention is: a device for detecting the bonding strength of an inner hole coating, including a testing component, a control component for controlling the testing component, and a signal transmission component for transmitting the test results;

[0008] Fix the product to be tested on the test bench through a positioning fixture;

[0009] Extend the testing component into the inner hole of the product to be tested through the control component to control the scribing trajectory, scribing position, and scribing pressure of the testing component;

[0010] Obtain the test signal of the testing component during the test through the signal transmission component, and transmit the test signal to the control component for display to assist the human-machine interaction during the test.

[0011] A further technical solution of the present invention is: the testing component includes a scribing module, and the scribing module is connected to the driving module of the control component through a bracket. The scribing position is adjusted axially or circumferentially through the driving module, and the radial feed distance of the scribing module is adjusted to determine the scribing trajectory and scribing pressure intensity.

[0012] A further technical solution of the present invention is: the scribing module is a diamond indenter.

[0013] A further technical solution of the present invention is: the control component includes a support table, a two-degree-of-freedom driving module for controlling the test bench, and a linear driving module for controlling the displacement of the bracket relative to the support table; a chute is opened on the support table and is slidably connected to the bracket mounted thereon;

[0014] The two-degree-of-freedom driving module is used to control the lifting height of the test bench along its axis and the rotation angle around its axis, thereby controlling the extension position and relative rotation angle of the scribing module in the inner hole;

[0015] The linear driving module is used to control the linear movement of the bracket along the chute, thereby controlling the pressure applied by the scribing module to the inner hole coating of the product to be tested.

[0016] A further technical solution of the present invention is: the bracket is L-shaped, the arm parallel to the central axis of the inner hole of the product to be tested is connected to the linear driving module, and a diamond indenter is installed at the end of the arm perpendicular to the central axis of the inner hole of the product to be tested and faces the inner hole wall of the product to be tested;

[0017] One end of the bracket connected to the linear drive module is provided with a slider, and a reinforcing rib is provided at the root of the connected slider, and is slidably connected to the chute on the support table through the bottom slider; a drive rod is coaxially arranged at the bottom of the slider, and the drive rod is driven by the linear drive module to drive the bracket to move linearly.

[0018] A further technical solution of the present invention is that the control component further includes a switch, a control panel, and an adjustment knob provided on the controller. The entire detection device is turned on or off through the switch; control instructions are output to the two-degree-of-freedom drive module and the linear drive module through the control panel to control the initial position of the diamond indenter, control the moving distance and speed of the slider, and control the rotation speed or lifting speed of the test bench; the movement mode of the test bench is switched through the adjustment knob, and the movement mode of the test bench can be switched by turning the adjustment knob to a specified position to make it rotate or lift.

[0019] A further technical solution of the present invention is that the main body of the test bench is an annular plate, a limiting boss extends axially to one side along the outer edge of the annular plate, and a plurality of radial threaded holes are opened circumferentially on the circumferential surface of the limiting boss, and adjustment screws are installed in the radial threaded holes as positioning jigs; the test product coaxially installed on the annular plate of the test bench is radially limited by screwing the adjustment screws, and a rubber gasket is installed at the head of the adjustment screw to protect the test product.

[0020] A further technical solution of the present invention is that the signal transmission component includes a force sensor and a sound sensor installed on the bracket, and a force signal display screen and a sound signal display screen installed on the controller. The force sensor and the sound sensor are respectively connected to the controller through a force sensor data line and a sound sensor data line;

[0021] The force signal obtained by the force sensor is displayed on the force signal display screen, and the change of the force signal during the test process is displayed in real time through the force signal display screen, so as to determine the bonding strength;

[0022] The sound signal obtained by the sound sensor is displayed on the sound signal display screen, and the change of the sound signal during the test process is displayed in real time through the sound signal display screen to assist in determining the bonding strength;

[0023] It is connected to an external analysis device and a device for extracting test results through a data interface installed on the controller.

[0024] A method for detecting the bonding strength of an inner hole coating, the specific steps are as follows:

[0025] Install the test product on the test bench through the positioning jig;

[0026] Output a control instruction according to the determined detection position, and control the position of the test bench relative to the scribing module by the two-degree-of-freedom drive module, so that the scribing module is opposite to the initial detection position;

[0027] Start the detection device, adjust the axial position and circumferential rotation angle of the test bench according to the set scribing trajectory, and adjust the feeding distance of the scribing module according to the set pressure;

[0028] The force sensor and the sound sensor send the collected test signals to the controller, obtain the change curves of the force signal and the sound signal, and complete the detection.

[0029] A further technical solution of the present invention is that: the signal receiving end of the controller is provided with an analog-digital signal converter, an amplifier, and a filter, and the received electrical signal is converted into a digital signal and displayed on the display screen.

[0030] Beneficial effects

[0031] The beneficial effects of the present invention are as follows: the present invention separates the test bench and the test component, and drives and controls the two respectively through the two-degree-of-freedom drive module and the linear drive module. By controlling the lifting position of the test bench, the extension position adjustment of the test component inside the inner hole is realized, and the pressure intensity applied by the scribing module to the inner hole wall is indirectly controlled by controlling the sliding distance of the bracket; because the test component is independently designed, its structural volume is small, and it can meet the universality of various inner hole sizes while ensuring the test accuracy. The specific advantages are as follows:

[0032] 1. The detection device of the present invention is convenient for disassembly and handling, and has few requirements for the use scenario.

[0033] 2. The detection device of the present invention directly detects the bonding strength of the inner hole coating, omits the process of cutting samples, improves the detection efficiency, and facilitates the optimization of process parameters.

[0034] 3. The detection device of the present invention can meet the requirements for detecting the bonding strength of the axial and circumferential coatings of the inner hole sample through the relative movement of the test bench.

[0035] 4. The detection device of the present invention can replace the bracket size and adjust the adjustment screw to adapt to the detection requirements of the inner holes of cylindrical parts with different barrel lengths and different hole diameters, and has universality. Description of the drawings

[0036] Figure 1 It is an overall schematic diagram of an inner hole coating bonding strength detection device in an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the test bench and the test component in an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the connection between the bracket and the slider in an embodiment of the present invention.

[0039] Description of Reference Numerals: 1. Specimen; 2. Force Signal Display Screen; 3. Switch; 4. Control Panel; 5. Adjustment Knob; 6. Test Bench; 7. Adjusting Screw; 8. Sound Signal Display Screen; 9. Data Interface; 10. Rubber Gasket; 11. Diamond Indenter; 12. Force Sensor; 13. Force Sensor Data Cable; 14. Sound Sensor; 15. Bracket; 16. Slide Groove; 17. Sound Sensor Data Cable; 18. Slide Block; 19. Reinforcing Rib; 20. Screw; 21. Support Table; 22. Controller. Detailed Implementation Manner

[0040] The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0042] Based on the problems of poor accuracy in the existing detection method for inner hole coatings and the inability to quantitatively analyze the differences in bonding strength caused by different process parameters, etc., the present invention exemplarily provides an inner hole coating bonding strength detection device, including a test component, a control component for controlling the test component, and a signal transmission component for transmitting test results; fixing the product to be tested on the test bench through a positioning fixture; extending the test component into the inner hole of the product to be tested through the control component to control the scribing trajectory, scribing position and scribing pressure of the test component; obtaining the test signal of the test component during the test through the signal transmission component and transmitting the test signal to the control component for display to assist the human-machine interaction during the test.

[0043] The above technical solutions will be further described below with reference to the accompanying drawings and examples:

[0044] In one embodiment, referring to Figure 1 as shown, an inner hole coating bonding strength detection device in this embodiment includes a controller and a test bench and a test component mounted thereon. The controller includes a control component and a signal transmission component.

[0045] In an example, the control component includes a switch 3, a control panel 4, and an adjustment knob 5 disposed on the controller. The switch 3 is used to control the power on or off of the device; the control panel 4 is used to control the initial position of the diamond indenter 11, the moving distance and speed of the slider 18, and the rotation speed or lifting speed of the test bench 6; the adjustment knob 5 is used to switch the movement mode of the test bench 6. By turning the adjustment knob 5 to a specified position, the movement mode of the test bench 6 can be switched to make it rotate or lift.

[0046] In an example, the control component further includes a support table 21, a two-degree-of-freedom drive module, and a linear drive module disposed in the controller. A chute 16 is formed on the support table 21 and is slidably connected to a bracket 15 mounted thereon;

[0047] In an example, the two-degree-of-freedom drive module is used to control the lifting height of the test bench along its axis and the rotation angle around its axis, thereby controlling the extension position and relative rotation angle of the scribing module in the inner hole;

[0048] In an example, the linear drive module is used to control the linear movement of the bracket along the chute, thereby controlling the pressure applied by the scribing module to the inner hole coating of the product to be tested.

[0049] In one embodiment, referring to Figure 2 As shown, in this embodiment, the main body of the test bench 6 is an annular plate. The outer edge of the annular plate extends a limit boss axially to one side, and a plurality of radial threaded holes are formed in the circumferential surface of the limit boss. An adjustment screw 7 is installed in the radial threaded hole as a positioning fixture; by screwing the adjustment screw 7, the product to be tested coaxially installed on the annular plate of the test bench is radially limited, and a rubber gasket 10 is installed at the head of the adjustment screw 7 to protect the product to be tested.

[0050] In an example, the test component includes a diamond indenter 11, a bracket 15, a chute 16, a slider 18, a reinforcing rib 19, and a screw 20. The test bench 6 is located at the top of the device and is separated from the device main body. The test bench 6 is connected to the internal two-degree-of-freedom drive module and can perform lifting or rotating movements. Threaded holes are formed in the raised outer ring of the test bench 6; the adjustment screw 7 is screwed into the threaded hole in the outer ring of the test bench 6 to play a role in positioning and clamping the specimen 1; the rubber gasket 10 is installed at the bottom of the adjustment screw 7. When the adjustment screw 7 is screwed into the specimen 1, the rubber gasket 10 is located between the adjustment screw 7 and the specimen 1 to protect the outer wall of the specimen 1. At the same time, the deformation generated by the rubber gasket 10 can ensure that the specimen 1 is completely clamped, preventing result errors caused by the instability of the specimen 1 during the test; the diamond indenter 11 is installed on the top of the bracket 15;

[0051] In an example, referring to Figure 3As shown, the bracket 15 is L-shaped. The arm of the bracket parallel to the central axis of the inner hole of the product to be tested is connected to the linear drive module. At the end of the arm perpendicular to the central axis of the inner hole of the product to be tested, a diamond indenter 11 is installed and faces the inner hole wall of the product to be tested. The bracket 15 is connected to the slider 18 by screws 20. Reinforcing ribs 19 are provided on the bracket 15 to prevent result errors caused by the shaking of the bracket 15 during the test. The slider 18 is connected to the linear drive module inside the device through the chute 16 at the top of the device and can move linearly in the chute 16 to achieve the change of the applied force and the adaptation to specimens 1 of different calibers.

[0052] In an example, the signal transmission component includes a force signal display screen 2, a sound signal display screen 8, a data interface 9, a force sensor 12, a force sensor data line 13, a sound sensor 14, and a sound sensor data line 17. The force signal display screen 2 is used to display the change of the force signal in real time during the test to determine the bonding strength. The sound signal display screen 8 is used to display the change of the sound signal in real time during the test to assist in determining the bonding strength. The data interface 9 can be used to connect to other analysis devices externally and extract the test results. The force sensor 9 is installed on the bracket 15 to receive the change of the force during the test. The force sensor data line 13 connects the force sensor 9 and the device main body to transmit the signal received by the force sensor 9 into the device. The sound sensor 14 is used to receive the change of the sound during the test. The sound sensor data line 17 connects the sound sensor 14 and the device main body to transmit the signal received by the sound sensor 14 into the device.

[0053] In another embodiment, a method for detecting the bonding strength of an inner hole coating specifically includes the following steps:

[0054] Step 1: Install the product to be tested on the test bench through the positioning fixture.

[0055] Step 2: Output a control command according to the determined detection position, and the two-degree-of-freedom drive module controls the position of the test bench relative to the scribing module so that the scribing module is opposite to the initial detection position.

[0056] Step 3: Start the detection device, adjust the axial position and circumferential rotation angle of the test bench according to the set scribing trajectory, and adjust the feed distance of the scribing module according to the set pressure.

[0057] Step 4: The force sensor and the sound sensor send the test signals collected in real time to the controller to obtain the change curves of the force signal and the sound signal, and complete the detection.

[0058] In an example, an analog-digital signal converter, an amplifier, and a filter are provided at the signal receiving end of the controller to convert the received electrical signal into a digital signal and display it on the display screen.

[0059] Taking the axial detection of the bonding strength of the inner hole of a cylindrical part specimen as an example, the usage process of the device is described as follows:

[0060] (1) Place the specimen 1 to be detected on the test bench 6, and screw in the adjustment screw 7 through the threaded holes on the outer ring of the test bench 6 until the rubber gasket 10 contacts and clamps the specimen 1, thus completing the installation of the specimen.

[0061] (2) Turn on the switch 3 to start the power supply of the detection device. Rotate the adjustment knob 5 to make the test bench 6 in the lifting motion mode. Set the moving speed of the slider 18 and the rising speed of the test bench 6 through the control panel 4 to adjust the changing rate of the force exerted by the diamond indenter 11 on the specimen 1. At the same time, adjust the relative position of the slider 18 in the chute 16 to make it contact with the specimen 1, thus completing the test preparation work.

[0062] (3) Start the internal drive assembly through the control panel 4. The slider 18 drives the support 15 to move towards the specimen 1, so that the diamond indenter 11 exerts a gradually increasing force on the surface of the inner hole coating of the specimen 1. At this time, the reinforcing rib 19 of the support 15 can ensure the stability of the support 15 during the loading process. The test bench 6 rises slowly at the set rate. Under the combined action of the two, scratches will be generated on the surface of the inner hole coating of the specimen 1. The force sensor 12 and the acoustic sensor 14 will collect the coating response signals during this process, and transmit the response signals to the detection device through the force sensor data line 13 and the acoustic sensor data line 17, and display them on the force signal display screen 2 and the acoustic signal display screen 8.

[0063] (4) When the film-substrate bonding fails, the force signal curve and the acoustic signal curve of the coating will mutate. However, large particles on the coating surface may also cause mutations in the force signal, and external sound interference will also cause mutations in the acoustic signal. Therefore, to ensure the accuracy of the experimental results, the determination condition for coating failure is that when curve mutations are simultaneously observed on the force signal display screen 2 and the acoustic signal display screen 8, the load at this time is used as the critical load. At this time, turn off the internal drive assembly through the control panel 4, and the test bench 6 and the slider 18 stop moving, thus completing the detection of the bonding strength of the inner hole coating.

[0064] (5) After the test, control the slider 18 and the test bench 6 to reset through the control panel 4. Rotate the adjustment screw 7 to remove the specimen 1, export the experimental data through the data interface 9, and turn off the switch 3. The detection of the bonding strength of the inner hole coating of this specimen 1 is completed.

[0065] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A method for detecting the bonding strength of an inner hole coating, characterized in that The specific steps are as follows: Install the product to be tested on the test bench through a positioning fixture; Output a control instruction according to the determined detection position, and control the position of the test bench relative to the scribing module by a two-degree-of-freedom driving module, so that the scribing module is opposite to the initial detection position; Start the detection device, adjust the axial position and circumferential rotation angle of the test bench according to the set scribing trajectory, and adjust the feeding distance of the scribing module according to the set pressure; The force sensor and the acoustic sensor send the collected test signals to the controller to obtain the change curves of the force signal and the acoustic signal, and complete the detection; the determination condition for coating failure is that when the change curves of the force signal and the acoustic signal mutate simultaneously, the load at this time is used as the critical load; The inner hole coating bonding strength detection device includes a test component, a control component for controlling the test component, and a signal transmission component for transmitting the test result; the product to be tested is fixed on the test bench through a positioning fixture; the test component is extended into the inner hole of the product to be tested through the control component to control the scribing trajectory, scribing position and scribing pressure of the test component; the test signals during the test of the test component are obtained through the signal transmission component and transmitted to the control component for display to assist the human-computer interaction during the test; The control component includes a support table, a two-degree-of-freedom driving module for controlling the test bench, and a linear driving module for controlling the displacement of the support relative to the support table; a sliding groove is opened on the support table and is slidably connected to the support carried thereon; The two-degree-of-freedom driving module is used to control the lifting height of the test bench along its axis and the rotation angle around its axis, and further control the extension position and relative rotation angle of the scribing module in the inner hole; The linear driving module is used to control the linear movement of the support along the sliding groove, and further control the pressure applied by the scribing module to the inner hole coating of the product to be tested.

2. The method for detecting the bonding strength of an inner hole coating according to claim 1, wherein: The test component includes a scribing module, and the scribing module is connected to the driving module of the control component through a support. The scribing position is adjusted axially or circumferentially through the driving module, and the radial feeding distance of the scribing module is adjusted to determine the scribing trajectory and the scribing pressure intensity.

3. The method for detecting the bonding strength of the inner hole coating according to claim 2, characterized in that: The scribing module is a diamond indenter.

4. The method for detecting the bonding strength of an inner hole coating according to claim 1, characterized in that: The support is L-shaped. The arm parallel to the central axis of the inner hole of the product to be tested is connected to the linear driving module, and the end of the arm perpendicular to the central axis of the inner hole of the product to be tested is equipped with a diamond indenter and faces the inner hole wall of the product to be tested; One end of the support connected to the linear driving module is provided with a slider, and a reinforcing rib is provided at the root of the connecting slider. The slider is slidably connected to the sliding groove on the support table through the bottom slider; a driving rod is coaxially arranged at the bottom of the slider, and the linear driving module drives the driving rod to drive the support to move linearly.

5. The method for detecting the bonding strength of an inner hole coating according to claim 4, wherein: The control component further includes a switch, a control panel, and an adjustment knob arranged on the controller. The opening or closing of the entire detection device is controlled through the switch; control instructions are output to the two-degree-of-freedom driving module and the linear driving module through the control panel to control the initial position of the diamond indenter, control the moving distance and speed of the slider, and control the rotation speed or lifting speed of the test bench; The movement mode of the test bench is switched by adjusting the knob. By turning the adjusting knob to a specified position, the movement mode of the test bench can be switched to make it rotate or lift.

6. The method for detecting the bonding strength of an inner hole coating according to claim 5, characterized in that: The main body of the test bench is an annular plate. The outer edge of the annular plate extends a limiting boss axially to one side, and a plurality of radial threaded holes are circumferentially formed on the circumferential surface of the limiting boss. Adjusting screws are installed in the radial threaded holes as positioning jigs; the test product coaxially installed on the annular plate of the test bench is radially limited by screwing the adjusting screws, and a rubber gasket is installed at the head of the adjusting screw to protect the test product.

7. The method for detecting the bonding strength of an inner hole coating according to claim 6, characterized in that: The signal transmission component includes a force sensor and a sound sensor installed on a bracket, and a force signal display screen and a sound signal display screen installed on a controller. The force sensor and the sound sensor are respectively connected to the controller through a force sensor data line and a sound sensor data line; The force signal obtained by the force sensor is displayed on the force signal display screen, and the change of the force signal during the test process is displayed in real time through the force signal display screen, so as to determine the bonding strength; The sound signal obtained by the sound sensor is displayed on the sound signal display screen, and the change of the sound signal during the test process is displayed in real time through the sound signal display screen to assist in determining the bonding strength; It is connected to an external analysis device and a device for extracting test results through a data interface installed on the controller.

8. The method for detecting the bonding strength of an inner hole coating according to claim 1, characterized in that: The signal receiving end of the controller is provided with an analog-to-digital signal converter, an amplifier, and a filter, and the received electrical signal is converted into a digital signal and displayed on the display screen.

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