Quantitative measurement device for adhesive force of electrophoresis paint film of automobile sheet and use method of quantitative measurement device

Abstract

The invention discloses an automobile sheet electrophoresis paint film adhesive force quantitative measurement device and a use method thereof, and relates to the technical field of automobile quality test.The automobile sheet electrophoresis paint film adhesive force quantitative measurement device comprises a base, a supporting frame, a measurement device and an electricity measurement box, the base is provided with a measurement station, and the measurement station is used for placing a to-be-measured plate; the support frame is fixedly connected with the base; the measuring device is fixedly connected to the supporting frame, a friction head is arranged at the output end of the measuring device, the friction head can rotate and polish a paint film of the to-be-measured plate, the measuring device further comprises a pressure gauge and a timer, the pressure gauge is used for measuring and displaying the pressure of the friction head abutting against the to-be-measured plate, and the timer is used for recording the polishing time of the friction head; one end of the electricity measuring box is used for being electrically connected with the friction head, the other end of the electricity measuring box is used for being electrically connected with the iron substrate of the to-be-measured plate, after the friction head polishes and falls off a paint film of the to-be-measured plate, current circulation is generated among the electricity measuring box, the friction head and the iron substrate of the to-be-measured plate, the structure is simple, use is convenient, and the measuring accuracy is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile quality testing, and in particular to a device for quantifying the adhesion of an electrophoretic paint film on an automobile plate and a method for using the device. Background Art

[0002] In the field of automobile manufacturing, the losses caused by corrosion are huge every year. How to improve the corrosion resistance of automobile products has become one of the important issues faced by domestic and foreign companies. Therefore, the automobile manufacturing industry pays more and more attention to the coating of automobile products, so it is necessary to test the adhesion of paint films. There are many performance tests of films, such as paint film hardness test, paint film adhesion test, paint film weathering test, paint film salt spray resistance test, etc. Through different tests, various properties of the paint film are evaluated. As for the test method of adhesion, the grid method (GB / T) is widely used in the automobile industry, but with the continuous optimization of production process technology, the adhesion of electrophoretic paint film to automobile plate has exceeded the detection range of the conventional hundred-grid knife scratch method, resulting in the adhesion of the paint film tested by the hundred-grid knife scratch method is 0 level, and it is difficult to quantify the differences between electrophoretic paint films under different working conditions.

[0003] The invention patent CN113514390B uses alternating immersion in boiling solution and ice water to accelerate the failure of the coating, and then conducts a grid test on this basis. However, this method is performed after the coating and steel plate have been damaged to a certain extent, which may cause uncertain effects on the complicated electrophoretic coating process and materials, such as whether the paint film is not heat-resistant and shrinks and expands but the actual bonding strength is better, and the difference in film layer bonding strength cannot be simply evaluated. Summary of the invention

[0004] The purpose of the present invention is to provide a device for quantifying the adhesion of electrophoretic paint film on automobile panels and a method for using the device to solve the problems existing in the above-mentioned prior art. The device has a simple structure, is easy to use, and effectively improves the accuracy of measurement.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a quantitative measurement device for the adhesion of electrophoretic paint film on automobile plates, comprising: a base, a support frame, a measurement device and an electrical measurement box, wherein a measurement station is arranged on the top of the base, and the measurement station is used for detachably fixing a plate to be measured covered with a paint film; the bottom of the support frame is fixedly connected to the top of the base; the measurement device is fixedly connected to the top of the support frame, and the output end of the measurement device can be extended or shortened to contact the plate to be measured, and the output end of the measurement device is provided with a friction head, and the friction head can rotate and grind the paint film of the plate to be measured until the paint film is separated from the plate to be measured, the measurement device also includes a pressure gauge and a timer, the pressure gauge is used to measure and display the pressure of the friction head against the plate to be measured, and the timer is used to record the grinding time of the friction head; one end of the electrical measurement box is used to be electrically connected to the friction head, and the other end is used to be electrically connected to the iron substrate of the plate to be measured, and after the friction head grinds off the paint film of the plate to be measured, current flows between the electrical measurement box, the friction head and the iron substrate of the plate to be measured.

[0007] Preferably, it further comprises a sample holder, and the sample holder is used to fix the board to be tested on the measuring station.

[0008] Preferably, the sample holder includes a first clamp block and a second clamp block, the first clamp block and the second clamp block are respectively arranged on both sides of the measuring station, and the first clamp block and the second clamp block are both slidably connected to the base and can maintain the position after sliding to clamp the test plate to the measuring station.

[0009] Preferably, rubber pads are provided at positions of the first clamping block and the second clamping block for contacting the board to be tested.

[0010] Preferably, the measuring device includes a device body, a fixed rod and a movable rod, the fixed rod is used to be connected to the device body, the movable rod is slidably connected to the fixed rod and can maintain the position after sliding, and the friction head is arranged at the end of the movable rod away from the fixed rod, and the pressure gauge is arranged in the device body and at the end of the fixed rod away from the movable rod to measure and display the pressure of the friction head against the plate to be tested.

[0011] Preferably, a fixing piece is further included, and the fixing piece is used to lock the fixing rod and the movable rod.

[0012] Preferably, it also includes a driving motor, which is fixedly connected to one end of the movable rod away from the fixed rod, and the output shaft of the driving motor is fixedly connected to the friction head to drive the friction head to rotate.

[0013] Preferably, one end of the electrical measuring box is electrically connected to the friction head via a conductive slip ring.

[0014] Preferably, the friction head is made of GCr15 material.

[0015] The present invention also provides a method for using the device for quantifying the adhesion of electrophoretic paint film on automobile plates as described in any one of the above items, comprising the following steps:

[0016] Fix the plate to be tested to the measuring station on the top of the base, electrically connect the measuring electrical box to the friction head and the plate to be tested respectively, control the friction head of the measuring device to move toward the plate to be tested and contact the surface of the steel plate until the pressure gauge displays a constant color design force value, drive the friction head to rotate at the design speed, and start the timer at the same time. Stop running when the electrical box to be tested displays that current is flowing, and record the end time.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The invention provides a device for quantitatively measuring the adhesion of electrophoretic paint film on automobile plates and a method for using the device. The plate to be tested is fixed to a measuring station on the top of a base, a measuring box is electrically connected to a friction head and the plate to be tested respectively, the friction head of the measuring device is controlled to move toward the plate to be tested and contact the surface of the steel plate until a pressure gauge displays a constant color design force value, the friction head is driven to rotate at a design speed, and a timer starts timing at the same time. The electric box to be tested stops running when it displays that current is flowing, and the end time is recorded. The device has a simple structure and is easy to use. The device can quantify the contact pressure between the friction head and the plate to be tested and the speed of the friction head. The time when the paint film is detached can be accurately recorded through the measuring box and the timer. The device has a simple structure and is easy to use, and the accuracy of the measurement is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a device for quantifying the adhesion of electrophoretic paint films on automobile panels provided by the present invention;

[0021] In the figure: 1. base; 2. support frame; 3. device body; 4. test box; 5. sample holder; 6. board to be tested; 7. fixed rod; 8. movable rod; 9. fixing part; 10. friction head; 11. pressure gauge; 12. timer; 13. wire. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a device for quantifying the adhesion of electrophoretic paint film on automobile panels and a method for using the device to solve the problems existing in the above-mentioned prior art. The device has a simple structure, is easy to use, and effectively improves the accuracy of measurement.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The present invention provides a device for quantifying the adhesion of electrophoretic paint films on automobile plates. Figure 1 As shown, it includes: a base 1, a support frame 2, a measuring device and a measuring box 4. The top of the base 1 is provided with a measuring station, and the measuring station is used to detachably fix the test plate 6 covered with a paint film; the bottom of the support frame 2 is fixedly connected to the top of the base 1; the measuring device is fixedly connected to the top of the support frame 2, and the output end of the measuring device can be extended or shortened to contact the test plate 6, and the output end of the measuring device is provided with a friction head 10, the friction head 10 can rotate and grind the paint film of the test plate 6 until the paint film is separated from the test plate 6, and the measuring device also includes a pressure gauge 11 and a timer 12, the pressure gauge 11 is used to measure and display the friction head 10 against the test plate 6 The timer 12 is used to record the grinding time of the friction head 10; one end of the measuring box 4 is used to be electrically connected to the friction head 10, and the other end is used to be electrically connected to the iron substrate of the plate to be tested 6. After the friction head 10 grinds off the paint film of the plate to be tested 6, a current flows between the measuring box 4, the friction head 10 and the iron substrate of the plate to be tested 6. Through the extendable and shortened output end of the measuring device and the rotating friction head 10, the paint film can be accurately grinded. The pressure gauge 11 and the timer 12 can accurately measure the pressure and grinding time of the friction head 10 respectively, and the setting of the measuring box 4 can generate current flow after the paint film is grinded off, so as to realize the quantitative measurement of the adhesion of the paint film.

[0026] In a preferred embodiment, the surface paint film is polished off at the edge of the board to be tested 6 using sandpaper or a cutter to expose the iron substrate, and then the wire 13 at one end of the test box 4 is adhered to the exposed part of the iron substrate with tape.

[0027] In a preferred embodiment, the automobile plate electrophoretic paint film adhesion quantitative measurement device also includes a sample holder 5, which is used to fix the plate to be tested 6 on the measuring station. The sample holder 5 can ensure that the plate to be tested 6 is stably fixed on the measuring station during the measurement process, thereby avoiding the accuracy of the measurement result being affected by the shaking of the plate to be tested 6.

[0028] In a preferred embodiment, the sample holder 5 includes a first clamp block and a second clamp block, which are respectively arranged on both sides of the measuring station, and the first clamp block and the second clamp block are both slidably connected to the base 1 and can maintain the position after sliding to clamp the board to be tested 6 to the measuring station. The use of the slidable first clamp block and the second clamp block can adapt to boards to be tested 6 of different sizes, thereby improving the versatility of the sample holder 5 and ensuring the firm clamping of the board to be tested 6.

[0029] In a preferred embodiment, rubber pads are provided at the positions where the first clamping block and the second clamping block contact the test board 6. The rubber pads can play a buffering role when clamping the test board 6 to avoid damage to the test board 6, while increasing friction and improving the stability of clamping.

[0030] In a preferred embodiment, the measuring device includes a device body 3, a fixed rod 7 and a movable rod 8, the fixed rod 7 is used to connect with the device body 3, the movable rod 8 is slidably connected with the fixed rod 7 and can maintain the position after sliding, and the friction head 10 is arranged at the end of the movable rod 8 away from the fixed rod 7, the pressure gauge 11 is arranged in the device body 3 and at the end of the fixed rod 7 away from the movable rod 8 to measure and display the pressure of the friction head 10 against the plate to be measured 6, the sliding connection between the movable rod 8 and the fixed rod 7 can flexibly adjust the contact position of the friction head 10 and the plate to be measured 6 to meet different measurement requirements, and the pressure gauge 11 is set at a specific position to accurately measure and display the abutment pressure of the friction head 10, providing reliable data for measurement.

[0031] In a preferred embodiment, the automobile panel electrophoretic paint film adhesion quantitative measurement device also includes a fixing part 9, which is used to lock the fixed rod 7 and the movable rod 8. The fixing part 9 can lock the movable rod 8 with the fixed rod 7 after adjusting the position of the movable rod 8, thereby ensuring the stable position of the friction head 10 during the measurement process and improving the accuracy and reliability of the measurement.

[0032] In a preferred embodiment, the automobile plate electrophoretic paint film adhesion quantitative measurement device also includes a drive motor, which is fixedly connected to the end of the movable rod 8 away from the fixed rod 7, and the output shaft of the drive motor is fixedly connected to the friction head 10 to drive the friction head 10 to rotate. The drive motor can accurately control the rotation of the friction head 10, preferably at 30r / min, to ensure the stability and consistency of the grinding process and improve the accuracy of the measurement results.

[0033] In a preferred embodiment, one end of the electrical measuring box 4 is electrically connected to the friction head 10 through a conductive slip ring. The electrical connection between the electrical measuring box 4 and the rotating friction head 10 is achieved through the conductive slip ring, which can ensure a stable electrical connection during the rotation of the friction head 10 and ensure smooth measurement.

[0034] In a preferred embodiment, the friction head 10 is made of GCr15 material. The friction head 10 made of GCr15 material has high hardness and wear resistance, can maintain good performance during long-term use, and improve the service life of the measuring device.

[0035] Embodiment 2

[0036] This embodiment also provides a method for using the above-mentioned device for quantifying the adhesion of electrophoretic paint film on automobile plates, comprising the following steps:

[0037] 1. Preparation

[0038] The automobile panel covered with the paint film to be tested is placed on the measuring station of the base 1 .

[0039] The positions of the first clamping block and the second clamping block of the sample holder 5 are adjusted so that they are located on both sides of the measuring station respectively, and the plate to be tested 6 is clamped and fixed on the measuring station by sliding the clamping block. The rubber pad on the clamping block can prevent damage to the plate to be tested 6 during the clamping process, and can also increase the friction force to improve the clamping stability.

[0040] 2. Measurement device adjustment stage

[0041] The movable rod 8 of the measuring device is adjusted to slide relative to the fixed rod 7 to move the friction head 10 to a suitable position to contact the plate to be measured 6. The sliding connection between the movable rod 8 and the fixed rod 7 can meet different measurement requirements and flexibly adjust the contact position of the friction head 10 and the plate to be measured 6.

[0042] The fixing member 9 is used to lock the fixed rod 7 and the movable rod 8 to ensure that the friction head 10 is in a stable position during the measurement process, thereby improving the accuracy and reliability of the measurement.

[0043] Whether the pressure of the friction head 10 abutting the test plate 6 is appropriate is confirmed by the pressure gauge 11 inside the device body 3. The pressure gauge 11 can accurately measure and display the abutting pressure of the friction head 10, providing reliable data for measurement.

[0044] 3. Measurement Phase

[0045] The drive motor is started, and the drive motor is fixedly connected to the end of the movable rod 8 away from the fixed rod 7, and its output shaft is fixedly connected to the friction head 10, and can drive the friction head 10 to rotate. The drive motor accurately controls the rotation of the friction head 10, ensures the stability and consistency of the grinding process, and improves the accuracy of the measurement results.

[0046] The friction head 10 rotates and polishes the paint film of the automobile plate, and the timer 12 starts to record the polishing time of the friction head 10 at the same time.

[0047] Continue grinding until the paint film is separated from the test plate 6.

[0048] 4. Measurement results acquisition stage

[0049] When the paint film is polished off, since one end of the measuring box 4 is electrically connected to the friction head 10 through a conductive slip ring, and the other end is electrically connected to the iron substrate of the board to be tested 6, current flows between the measuring box 4, the friction head 10 and the iron substrate of the board to be tested 6.

[0050] According to the pressure value displayed by the pressure gauge 11, the grinding time recorded by the timer 12, the current flow and other data, the adhesion of the electrophoretic paint film on the automobile plate can be quantitatively measured.

[0051] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for quantitatively measuring the adhesion of electrophoretic paint film on automobile panels, characterized in that: include: A base, a measuring station is arranged on the top of the base, and the measuring station is used to detachably fix the plate to be tested covered with the paint film; A support frame, the bottom of which is fixedly connected to the top of the base; A measuring device, wherein the measuring device is fixedly connected to the top of the support frame, and the output end of the measuring device can be extended or shortened to contact the plate to be tested, and the output end of the measuring device is provided with a friction head, and the friction head can rotate and grind the paint film of the plate to be tested until the paint film is separated from the plate to be tested, and the measuring device also includes a pressure gauge and a timer, wherein the pressure gauge is used to measure and display the pressure of the friction head against the plate to be tested, and the timer is used to record the grinding time of the friction head; as well as An electrical testing box, one end of which is electrically connected to the friction head, and the other end of which is electrically connected to the iron substrate of the board to be tested. After the friction head grinds off the paint film of the board to be tested, current flows between the electrical testing box, the friction head and the iron substrate of the board to be tested.

2. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 1, characterized in that: It also includes a sample holder, which is used to fix the board to be tested on the measuring station.

3. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 2, characterized in that: The sample holder includes a first clamp block and a second clamp block, the first clamp block and the second clamp block are respectively arranged on both sides of the measuring station, and the first clamp block and the second clamp block are both slidably connected to the base and can maintain the position after sliding to clamp the test plate to the measuring station.

4. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 3, characterized in that: Rubber pads are provided at positions of the first clamping block and the second clamping block for contacting the board to be tested.

5. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 4, characterized in that: The measuring device includes a device body, a fixed rod and a movable rod, wherein the fixed rod is used to be connected to the device body, the movable rod is slidably connected to the fixed rod and can maintain the position after sliding, and the friction head is arranged at the end of the movable rod away from the fixed rod, and the pressure gauge is arranged in the device body and at the end of the fixed rod away from the movable rod to measure and display the pressure of the friction head against the plate to be measured.

6. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 5, characterized in that: It also includes a fixing piece, which is used to lock the fixing rod and the movable rod.

7. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 6, characterized in that: It also includes a driving motor, which is fixedly connected to one end of the movable rod away from the fixed rod, and the output shaft of the driving motor is fixedly connected to the friction head to drive the friction head to rotate.

8. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 7, characterized in that: One end of the electrical measuring box is electrically connected to the friction head through a conductive slip ring.

9. The automobile plate electrophoretic paint film adhesion quantification measuring device according to claim 1, characterized in that: The friction head is made of GCr15 material.

10. A method for using the automobile plate electrophoretic paint film adhesion quantification measuring device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Fix the plate to be tested to the measuring station on the top of the base, electrically connect the measuring electrical box to the friction head and the plate to be tested respectively, control the friction head of the measuring device to move toward the plate to be tested and contact the surface of the steel plate until the pressure gauge displays a constant color design force value, drive the friction head to rotate at the design speed, and start the timer at the same time. Stop running when the electrical box to be tested displays that current is flowing, and record the end time.

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