CN104897494A - Optical surface scratch resistance testing apparatus capable of simulating multiple working conditions and application method thereof - Google Patents

Abstract

The invention discloses an optical surface scratch resistance test device for simulating various working conditions and its use method. The device includes a test piece, a tool head, a base system, an electromagnetic excitation system, an acoustic emission system and a pressure sensor The test piece is fixedly connected to the base system; the electromagnetic excitation system is connected to the base system; the signal of the acoustic emission system is connected to the test piece; the tool head is fixedly connected to the electromagnetic excitation system; the pressure sensor is connected to the tool head; Adjust the relative position of the tested specimen and the tool head through the base system; scratch the tested specimen through the electromagnetic excitation system; simulate various working conditions through the adjustment of vibration frequency, amplitude and sliding table movement; through the pressure The sensor detects the dynamic change of the pressure between the tool head and the tested specimen; the acoustic emission system detects the signal when the tested specimen reaches destruction. The invention can simulate various scratching working conditions, and realize the scratch resistance test of optical surfaces such as mobile phone screens, watch mirrors, and optical lenses.

Description

An optical surface scratch resistance test device and its application method for simulating various working conditions

technical field

The invention relates to an optical surface scratch resistance test device and a manufacturing method for simulating various working conditions.

Background technique

The application of large-screen terminal electronic devices such as smartphones is becoming more and more popular, and the anti-scratch performance of the screens has attracted more and more attention from the industry. With the increase of screen scratches, the actual brightness, touch accuracy and anti-shattering ability of the screen will be significantly reduced. Therefore, the industry continues to introduce various high-hardness materials, from tempered glass, coated glass to sapphire, for the manufacture of new screens. However, there has been no unified standard, quantitative detection index and corresponding detection equipment for the detection of scratch resistance of the screen. At the same time, in some traditional fields, such as the performance of surface masks, spectacle lenses, and lens glass products, scratch resistance is also an important indicator. However, the existing scratch detection mainly adopts the method of manual scratches. It is difficult to control the load and speed of scratches, and the scratch conditions cannot reflect the actual working conditions. At the same time, the scratch test often reflects the local scratch resistance of the tested specimen, so the repeatability and reliability of the test results are poor.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a test device for the anti-scratch performance of optical surfaces that simulates a variety of working conditions and its use method, using electromagnetic excitation to generate stable amplitude and frequency to drive the tool The head, combined with the high-precision individual movement or linkage of the slide table in the three directions of X, Y, and Z, simulates different scratching conditions, and realizes the scratch resistance test of optical surfaces such as mobile phone screens, watch mirrors, and optical lenses.

One of the technical solutions adopted by the present invention to solve its technical problems is:

An optical surface scratch resistance test device that simulates various working conditions, including a test piece 4 and a tool head 5 for scratching the test piece 4; it also includes a base system, an electromagnetic excitation system and a pressure sensor 6;

The tested specimen 4 is affixed to the base system; the electromagnetic excitation system is attached to the base system; the tool head 5 is affixed to the electromagnetic excitation system; the pressure sensor 6 is connected to the tool The first 5 are connected;

The relative position of the tested specimen 4 and the tool head 5 is adjusted through the base system; the tool head 5 is vibrated by the electromagnetic excitation system so that the tool head 5 can scratch the tested specimen 4; the tool is detected by the pressure sensor 6 The dynamic change of the pressure between the head 5 and the tested specimen 4; the signal when the tested specimen (4) reaches destruction is detected by the acoustic emission system (14).

In one embodiment: the base system includes an optical flat plate 1, an X-axis sliding table 3, a Y-axis sliding table 2 and a Z-axis sliding table 10; the Y-axis sliding table 2 is slidably mounted on the optical flat plate 1 and can move along the Y axis sliding in the X-axis direction; the X-axis sliding table 3 is slidingly mounted on the Y-axis sliding table 2 and can slide along the X-axis direction; the tested specimen 4 is fixed on the X-axis sliding table 3; the Z-axis sliding table 10 is slidingly mounted Connected to the optical flat panel 1 and can slide along the Z-axis direction; the X-axis direction and the Y-axis direction are perpendicular to the Z-axis direction in pairs; the X-axis slide table 3, the Y-axis slide table 2 and the Z-axis slide table 10 make The tested specimen 4 and the tool head 5 can move in the X-axis direction, the Y-axis direction and the Z-axis direction so as to adjust the relative positions of the tested specimen 4 and the tool head 5;

The electromagnetic excitation system includes an AC coil (11), a permanent magnet (12) and a spring (13); the electromagnetic exciter support (9) is attached to the Z-axis slide table (10), and the permanent magnet (12) is attached to the On the electromagnetic exciter support (9); the AC coil (11) is fixed on the electromagnetic exciter shell (8); the tool head (5) is fixed on the connecting rod (7); through the AC coil (11 ) generates vibration and transmits it to the tool head (5) through the electromagnetic vibrator shell (8) and the connecting rod (7) so that the tool head (5) vibrates so that the tool head (5) can vibrate the tested specimen (4) to scratch;

The pressure sensor 6 described in the Z-axis slide table 10 is mounted between the tool head 5 and the connecting rod 7;

The acoustic emission system (14) is installed inside the tested specimen (4).

In one embodiment: the shape of the tool head 5 is set according to the required cross-sectional shape of the surface texture of the test piece 4 , and the material of the tool head 5 is selected according to the material of the test piece 4 .

In one embodiment: the connecting rod (7) is a tapered screw; the connecting rod (7) is screwed on the shell (8) of the electromagnetic exciter.

In one embodiment: the X-axis sliding table 3 is driven by a stepping motor, and its stepping accuracy is better than 0.35 μm; the Y-axis sliding table 2 is driven by a stepping motor, and its stepping accuracy is better than 0.35 μm; The Z-axis sliding table 10 is driven by a stepping motor, and its stepping accuracy is better than 0.35 μm.

In an embodiment: the performance parameters of the electromagnetic exciter are: vibration frequency f = 0-20000 Hz, and the amplitude range is 0-5 mm.

Two of the technical solutions adopted by the present invention to solve the technical problems are:

A method for using an optical surface scratch resistance test device that simulates various working conditions, including:

1) Adjust the position of the tested specimen 4 in the X-axis direction and the Y-axis direction through the X-axis slide table 3 and the Y-axis slide table 2 so that it faces the tool head 5;

2) Adjust the position of the tool head 5 in the Z-axis direction through the Z-axis slide table 10 so that it is just in contact with the tested specimen 4;

3) According to the required scratching load, continue to move the Z-axis slide table 10 to press the tool head 5 into the test piece 4;

4) According to the specific requirements of the scratching working conditions, adjust the vibration frequency and amplitude of the electromagnetic excitation system and determine the moving speed of the X-axis slide 3 and/or the Y-axis slide 2, and start the electromagnetic excitation system to make the tool head 5 generate Vibrating and simultaneously moving the X-axis slide table 3 and/or the Y-axis slide table 2 as required to scratch the tested specimen 4, thereby producing different working conditions.

In one embodiment: also include:

5) Lift the tool head 5 by moving the Z-axis slide 10, adjust the position of the X-axis slide 3 and/or the Y-axis slide 2 according to the required working conditions, and repeat the steps 3)-4) once Or multiple times, so as to simulate different working conditions for scratch test.

In one embodiment: in the step 2), the method for judging that the tool head 5 is just in contact with the test piece 4 is: when the pressure sensor 6 detects that the pressure between the tool head 5 and the test piece 4 is greater than the critical value, it sends out The reminder signal is that the tool head 5 is just in contact with the tested specimen 4 at this time.

In one embodiment: in the step 4), the method for judging whether the tested sample (4) is damaged is: the acoustic emission signal measured by the acoustic emission system (14) changes significantly, and at this time the tested sample (4) 4) Destruction occurs during scratching.

Compared with the background technology, this technical solution has the following advantages:

The present invention provides an optical surface anti-scratch performance test equipment and manufacturing method that simulates various working conditions, uses electromagnetic excitation to generate stable amplitude and frequency to drive the tool head, and cooperates with X, Y, and Z three-direction sliding tables The high-precision movement makes the tool head and the tested specimen move relative to each other to produce different working conditions. At the same time, it can combine the numerical control technology to realize the linkage of the slide table in the three directions of X, Y and Z, and produce more complex scratching conditions. condition.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

FIG. 1 is a schematic diagram of an optical surface scratch resistance test device for simulating various working conditions of the present invention, wherein, A is the main view, and B is a partial schematic diagram.

FIG. 2 is a scratch track diagram of a scratch working condition in Embodiment 2 of the present invention.

Fig. 3 is a graph showing the acoustic emission signal of the scratch damage according to the second embodiment of the present invention.

FIG. 4 is a topography diagram of scratch damage caused by Example 2 of the present invention.

Reference signs: 1. Optical plate; 2. Y-axis sliding table; 3. X-axis sliding table; 4. Tested specimen; 5. Tool head; 6. Pressure sensor; 7. Connecting rod; 8. Electromagnetic excitation 9. Electromagnetic exciter bracket 10. Z-axis high-precision slide table; 11. AC coil; 12. Permanent magnet; 13. Spring; 14. Acoustic emission detection system.

Detailed ways

Below by embodiment the content of the present invention is specified:

Example 1

Please refer to Fig. 1, a kind of optical surface anti-scratch performance test equipment of simulating various working conditions, including the tested specimen 4 and the tool head 5 for processing the tested specimen 4; also includes base system, electromagnetic excitation Vibration system, acoustic emission detection system 14 and pressure sensor 6;

The base system includes an optical flat plate 1, an X-axis sliding table 3, a Y-axis sliding table 2 and a Z-axis sliding table 10; the Y-axis sliding table 2 is slidably mounted on the optical flat plate 1 and can slide along the Y-axis direction; X Axis sliding table 3 is slidably attached to Y-axis sliding table 2 and can slide along the X-axis direction; the tested specimen 4 is fixedly connected to X-axis sliding table 3; Z-axis sliding table 10 is slidably attached to optical plate 1 and can slide along the Z-axis direction; the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other;

The electromagnetic excitation system includes an AC coil (11), a permanent magnet (12) and a spring (13); the electromagnetic exciter support (9) is attached to the Z-axis slide table (10), and the permanent magnet (12) is attached to the On the electromagnetic exciter support (9); the AC coil (11) is fixed on the electromagnetic exciter shell (8); the tool head (5) is fixed on the connecting rod (7);

The pressure sensor 6 is mounted between the tool head 5 and the connecting rod 7;

The acoustic emission system (14) is installed inside the tested specimen (4).

Through the X-axis sliding table 3, the Y-axis sliding table 2 and the Z-axis sliding table 10, the tested specimen 4 and the tool head 5 can move in the X-axis direction, the Y-axis direction and the Z-axis direction to adjust the tested specimen 4 The relative position with the tool head 5; the electromagnetic excitation is generated by the electromagnetic exciter and transmitted to the tool head 5 through the electromagnetic exciter shell 8 and the connecting rod 7 to make the tool head 5 vibrate so that the tool head 5 can be tested. The workpiece 4 is processed; the dynamic change of the pressure between the tool head 5 and the tested specimen 4 is detected by the pressure sensor 6, and when the pressure is greater than the critical value, the pressure sensor 6 sends out a warning signal.

In this embodiment, the shape of the tool head 5 is set according to the required cross-sectional shape of the surface texture of the test piece 4 , and the material of the tool head 5 is selected according to the material of the test piece 4 .

Among the present embodiment, the connecting rod 7 is a tapered screw; the tapered part of its thread is at the tail of the screw, and the end surface of the electromagnetic exciter shell 8 is provided with a threaded hole, and the tapered part of the tapered screw is connected with the threaded hole. The tapered surface is adapted so that the connecting rod 7 is screwed on the shell 8 of the electromagnetic exciter.

In this embodiment, the X-axis sliding table 3 is driven by a stepping motor, and its stepping accuracy is better than 0.3 μm; the Y-axis sliding table 2 is driven by a stepping motor, and its stepping accuracy is better than 0.3 μm; The Z-axis sliding table 10 is driven by a stepping motor, and its stepping accuracy is better than 0.3 μm.

In this embodiment, the vibration frequency f=0-20000 Hz, and the amplitude range is 0-5 mm.

The on-site use mode of the present invention is as follows:

1) Adjust the position of the tested specimen 4 in the X-axis direction and the Y-axis direction through the X-axis slide table 3 and the Y-axis slide table 2 so that it faces the tool head 5;

2) Adjust the position of the tool head 5 in the Z-axis direction through the Z-axis slide table 10 to make it just in contact with the tested specimen 4; the method for judging that the tool head 5 is just in contact with the tested specimen 4 is: a pressure sensor 6. When it is detected that the pressure between the tool head 5 and the test piece 4 is greater than the critical value, a reminder signal is sent out. At this time, the tool head 5 is just in contact with the test piece 4; the critical value = 0.005 ~ 0.02N, according to The material of the tested specimen is determined, the greater the hardness of the material, the higher the critical value;

3) According to the required scratching load, continue to move the Z-axis slide table 10 to press the tool head 5 into the test piece 4;

4) According to the specific requirements of the scratching working conditions, adjust the vibration frequency and amplitude of the electromagnetic excitation system and determine the moving speed of the X-axis slide 3 and/or the Y-axis slide 2, and start the electromagnetic excitation system to make the tool head 5 generate Vibrate at high frequency and simultaneously move the X-axis slide table 3 and/or the Y-axis slide table 2 as required to process the tested specimen 4;

5) Lift the tool head 5 by moving the Z-axis slide 10, adjust the position of the X-axis slide 3 and/or the Y-axis slide 2 according to the specific requirements of the scratching condition, and repeat the steps 3)-4) One or more times, so as to realize the scratch test under different working conditions;

6) During the scratch test process, the acoustic emission detection system 14 is used to detect the change of the acoustic emission signal. When the acoustic emission signal changes significantly, it is considered that the tested specimen 4 has obvious scratch damage.

Example 2

Please refer to Fig. 2, which is a schematic diagram of a scratch working condition produced by an optical surface scratch resistance performance testing device simulating various working conditions of the present invention, and its production process is as follows:

1) Adjust the position of the test piece 4 in the X-axis direction and the Y-axis direction through the X-axis slide table 3 and the Y-axis slide table 2 so that it faces the tool head 5; among the present embodiment, the shape of the top end of the tool head 5 is It is a cone with a top cone angle of 60° and a round head radius of 0.2 mm. The material of the tool head 5 is hard alloy, and the material of the tested specimen 4 is tempered glass;

2) Adjust the position of the tool head 5 in the Z-axis direction through the Z-axis slide table 10 to make it just in contact with the tested specimen 4; the method for judging that the tool head 5 is just in contact with the tested specimen 4 is: a pressure sensor 6. When it is detected that the pressure between the tool head 5 and the test piece 4 is greater than the critical value of 0.02N, a reminder signal is sent, and at this time, the tool head 5 is just in contact with the test piece 4;

3) According to the required scratch load, continue to move the Z-axis slide table 10 so that the tool head 5 is pressed into the test piece 4 to a depth of 1 mm;

4) According to the specific requirements of the scratching working conditions, adjust the vibration frequency of the electromagnetic excitation system to 100Hz, the amplitude to 1.5mm, and the vibration waveform to be a sine wave, and determine the linear movement speed of the Y-axis sliding table 2 to be 200mm/s (2mm ×100Hz=200mm/s); start the electromagnetic excitation system to make the tool head 5 vibrate at a high frequency and start the Y-axis sliding table 2 at the same time to scratch the test piece 4, as shown in the line 1 in Figure 2 track;

5) Lift the tool head 5 by moving the Z-axis sliding table 10, adjust the Y-axis sliding table 2 to move 0.5mm along the negative direction of the Y-axis according to the specific requirements of the scratching working condition, and repeat the steps 3)-4) Scratch out the track shown in line 2 in Figure 2;

6) Repeat step 5), and wipe out the track shown in line 3 in Figure 2;

7) When there is a sudden change in the acoustic emission signal during the scratching process (as shown in Figure 3), it is considered that the tested sample 4 is damaged, the test is over, and the corresponding working conditions of the scratching test are recorded for subsequent analysis.

The above is only a preferred embodiment of the present invention, so the scope of the present invention cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still be covered by the present invention within range.

Claims (10)

1. simulate an optical surface anti-scratch performance testing apparatus for various working, it is characterized in that: the tool heads (5) comprising tested test specimen (4) and tested test specimen (4) is processed; Also comprise base systems, electromagnetic exciting system and pressure transducer (6);

Described tested test specimen (4) is fixed in base systems; Described electromagnetic exciting system is installed in base systems; Described tool heads (5) is fixed in electromagnetic exciting system; Described pressure transducer (6) is connected with tool heads (5);

The relative position of tested test specimen (4) and tool heads (5) is regulated by base systems; By electromagnetic exciting system make tool heads (5) occur vibration thus implementation tool head (5) carries out scratching to tested test specimen (4); By the dynamic change of pressure between pressure transducer (6) testing tool head (5) and tested test specimen (4); Signal when tested test specimen (4) reaches destruction is detected by acoustic emission system (14).

2. a kind of optical surface anti-scratch performance testing apparatus simulating various working according to claim 1, is characterized in that:

Described base systems comprises optical flat (1), X-axis slide unit (3), Y-axis slide unit (2) and Z axis slide unit (10); Y-axis slide unit (2) sliding installation is gone up at optical flat (1) and can be slided along Y direction; X-axis slide unit (3) sliding installation is gone up at Y-axis slide unit (2) and can be slided along X-direction; Described tested test specimen (4) is fixed in X-axis slide unit (3); Z axis slide unit (10) sliding installation is gone up at optical flat (1) and can be slided along Z-direction; Described X-direction, Y direction and Z-direction are vertical between two; By X-axis slide unit (3), Y-axis slide unit (2) and Z axis slide unit (10), tested test specimen (4) and tool heads (5) can be moved in X-direction, Y direction and Z-direction thus regulate the relative position of tested test specimen (4) and tool heads (5);

Described electromagnetic exciting system comprises AC coil (11), permanent magnet (12) and spring (13); Electromagnetic exciter support (9) is installed in Z axis slide unit (10), and permanent magnet (12) is installed in electromagnetic exciter support (9); AC coil (11) is fixed on electromagnetic exciter shell (8); Described tool heads (5) is fixed on connecting link (7); Produce vibrate and pass through electromagnetic exciter shell (8) and connecting link (7) by AC coil (11) and be passed to tool heads (5) to make tool heads (5) generation vibrate thus implementation tool head (5) carries out scratching to tested test specimen (4);

Described pressure transducer (6) is installed between tool heads (5) and connecting link (7);

It is inner that described acoustic emission system (14) is arranged on tested test specimen (4).

3. a kind of optical surface anti-scratch performance testing apparatus simulating various working according to claim 2, it is characterized in that: described tool heads (5) shape requires setting according to the Surface Texture cross sectional shape of required tested test specimen (4), and described tool heads (5) material is selected according to tested test specimen (4) material.

4. a kind of optical surface anti-scratch performance testing apparatus simulating various working according to claim 2, is characterized in that: described connecting link (7) is band tapering screw; Described connecting link (7) is screwed onto on electromagnetic exciter shell (8).

5. a kind of optical surface anti-scratch performance testing apparatus simulating various working according to claim 2, is characterized in that: described X-axis slide unit (3) is by driving stepper motor, and its stepping accuracy is better than 0.35 μm; Described Y-axis slide unit (2) is by driving stepper motor, and its stepping accuracy is better than 0.35 μm; Described Z axis slide unit (11) is by driving stepper motor, and its stepping accuracy is better than 0.35 μm.

6. a kind of optical surface anti-scratch performance testing apparatus simulating various working according to claim 2, it is characterized in that: the performance parameter of described electromagnetic exciter is: vibration frequency f=0 ~ 20000Hz, amplitude range is 0 ~ 5mm.

7. a kind of using method simulating the optical surface anti-scratch performance testing apparatus of various working according to claim 2, is characterized in that: comprising:

1) adjust tested test specimen (4) position in X-direction and Y direction by X-axis slide unit (3) and Y-axis slide unit (2) and make it just to tool heads (5);

2) it is made just to contact with tested test specimen (4) by Z axis slide unit (10) adjustment tool heads (5) position in the Z-axis direction;

3) according to the size of required scratching load, continue mobile Z axis slide unit (11) and make tool heads (5) be pressed into tested test specimen (4);

4) according to the specific requirement of scratching operating mode, the vibration frequency of adjustment electromagnetic exciting system and amplitude also determine the translational speed of X-axis slide unit (3) and/or Y-axis slide unit (2), start electromagnetic exciting system make tool heads (5) that vibration occur and make as required simultaneously X-axis slide unit (3) and/or Y-axis slide unit (2) mobile to carry out scratching to tested test specimen (4).

8. a kind of using method simulating the optical surface anti-scratch performance testing apparatus of various working according to claim 7, is characterized in that: also comprise:

5) tool heads (5) is lifted by mobile Z axis slide unit (10), according to required actual condition, the position of adjustment X-axis slide unit (3) and/or Y-axis slide unit (2), repeating said steps 3)-4) one or many, thus simulation various working carries out cut test.

9. a kind of using method simulating the optical surface anti-scratch performance testing apparatus of various working according to claim 7 or 8, it is characterized in that: described step 2) in, judge that tool heads (5) and the firm accessible method of tested test specimen (4) are: when pressure transducer (6) detects that between tool heads (5) and tested test specimen (4), pressure is greater than critical value, send alerting signal, be now tool heads (5) and just contact with tested test specimen (4).

10. a kind of using method simulating the optical surface anti-scratch performance testing apparatus of various working according to claim 7 or 8, it is characterized in that: described step 4) in, judge that the method whether tested sample (4) occurs to destroy is: the acoustic emission signal generation significant change that acoustic emission system (14) records, now tested sample (4) destroys in scratching process.