CN113109195A - Method for testing scratch resistance of plate - Google Patents
Method for testing scratch resistance of plate Download PDFInfo
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- CN113109195A CN113109195A CN202110410306.4A CN202110410306A CN113109195A CN 113109195 A CN113109195 A CN 113109195A CN 202110410306 A CN202110410306 A CN 202110410306A CN 113109195 A CN113109195 A CN 113109195A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention relates to a method for testing scratch resistance of a plate, which comprises the following steps: fixing a plate to be tested; scratching the surface of the plate to be tested by a preset length by using a pressure head with a tip at constant pressure or continuously increasing pressure, and monitoring depth change data of the pressure head pressed into the plate to be tested in real time; and calculating the average depth value or the average width value of the scratches on the board to be tested according to the depth change data, and evaluating the scratch resistance of the board to be tested according to the average depth value or the average width value of the scratches. According to the testing method, the scratch depth value is measured while the scratch is scratched on the board, the testing result can be output after the scratch is scratched, the testing process is convenient and fast, the actual scratch condition is met, and the scratch resistance of the board to be tested can be more accurately represented by the testing result.
Description
Technical Field
The invention relates to the technical field of plate performance detection, in particular to a method for testing scratch resistance of a plate.
Background
With the development of material science, various plates appear, such as ordinary glass, microcrystalline glass, ceramics, metal, polymer plastic, wood and the like, and scratch is often generated due to the action of external force in the actual use process of the plates, so that the surface of the plates is rough, the smoothness is reduced, the use effect of the plates in the use process is seriously influenced, and higher requirements are provided for the scratch resistance of the plates and the test method thereof.
However, in the conventional method for testing scratch resistance of a sheet material, a hardness tester indenter is generally used to generate a corresponding indentation on the surface of the sheet material, and the hardness value of the sheet material is calculated by measuring the diagonal length of the indentation, and the scratch resistance of the sheet material is determined according to the surface hardness. The scratch resistance of the plate is evaluated by using the surface hardness of the plate, so that the generation process of scratches is omitted, and the scratch resistance of the plate cannot be comprehensively evaluated. In other testing methods, after the plate is scratched by the scratching equipment, the scratch is measured by a single point, so that the testing process is complicated, the accuracy of the testing result is poor, and the scratch resistance of the plate cannot be accurately reflected.
Disclosure of Invention
Therefore, a testing method for evaluating the scratch resistance of the plate, which has the advantages of simple and convenient measuring process and accurate measuring result, is needed.
The invention provides a method for testing scratch resistance of a plate, which comprises the following steps:
fixing a plate to be tested;
scratching the surface of the plate to be tested by a preset length by using a pressure head with a tip at constant pressure or continuously increasing pressure, and monitoring depth change data of the pressure head pressed into the plate to be tested in real time;
and calculating the average depth value or the average width value of the scratches on the plate to be tested according to the depth change data.
In one embodiment, when the indenter scores the surface of the plate to be tested for a preset length of scratch with a constant pressure, the preset length of scratch is loCalculating an average depth value or an average width value of the scratches on the to-be-tested plate according to the depth variation data, including:
recording the scribing distance l and the scribing depth h corresponding to the scribing distance l in the scribing forming process to obtain an h-l curve;
performing integral treatment according to the h-l curve to obtain the average depth of the scratch
In one embodiment, the method further comprises the following steps: according to the average depth of the scratch
Obtaining the variance of the scratch depth
In one embodiment, the tip of the indenter is conical, the taper angle of the tip of the indenter is 2 theta, and the average width of the scratch can be obtained according to the geometrical relationship of the indenter
In one embodiment, the method further comprises the following steps:
according to the average width of the scratch
Obtaining the variance of the scratch width
In one embodiment, the pressure head is continuously increased with the pressure fWhen the surface of the plate to be tested is scratched with a scratch of a preset length, the initial pressure of the initial position of the scratch is f0The end pressure at the end position of the scratch is flCalculating an average depth value or an average width value of the scratches on the to-be-tested plate according to the depth variation data, including:
recording the continuously increasing pressure f and the corresponding scratch depth h in the scratch forming process to obtain an h-f curve;
performing integral treatment according to the h-f curve to obtain the average depth of the scratch
In one embodiment, the method further comprises the following steps: according to the average depth of the scratch
Obtaining the variance of the scratch depth
In one embodiment, the tip of the indenter is conical, the taper angle of the tip of the indenter is 2 theta, and the average width value of the scratch can be obtained according to the geometrical relationship of the indenter
In one embodiment, the method further comprises the following steps: according to the average width of the scratch
Obtaining the variance of the scratch width
In one embodiment, the tip of the ram has a taper angle in the range of 60 to 140, i.e., 30 to 70.
In one embodiment, in the step of scribing the scratch of the preset length on the surface of the plate to be tested by using the pressure head with the tip at constant pressure or continuously increasing pressure, the direction of the force applied by the pressure head to the plate to be tested is perpendicular to the surface of the scribed scratch of the plate to be tested.
In one embodiment, the continuously increasing pressure f ranges from 0.1N to 100N; the value range of the loading speed of the continuously increasing pressure f is 6N/min-60N/min.
The method for testing the scratch resistance of the plate comprises the steps of fixing the plate to be tested, scratching the surface of the plate to be tested by a preset length of scratches with a pressure head with a tip under constant force or continuously increasing pressure, monitoring depth change data of the pressure head pressed into the plate to be tested in real time, and calculating the average depth value or the average width value of the scratches on the plate to be tested according to the depth change data, so that the scratch resistance of the plate to be tested can be evaluated according to the average depth value or the average width value of the scratches. According to the testing method, the scratch depth value is measured while the scratch is scratched on the board, the testing result can be output after the scratch is scratched, the testing process is convenient and fast, the actual scratch condition is met, and the scratch resistance of the board to be tested can be accurately reflected by the testing result.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus for testing scratch resistance of a board according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating the steps of one embodiment of the method for testing the scratch resistance of a sheet material according to the present invention;
FIG. 3 is a flow chart illustrating the steps of another embodiment of the method for testing the scratch resistance of a sheet material according to the present invention;
FIG. 4 is a flowchart illustrating the steps of a method for testing the scratch resistance of a plate according to another embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, fig. 1 is a schematic structural diagram illustrating a testing apparatus for testing scratch resistance of a plate according to an embodiment of the present invention, the testing apparatus includes a material loading platform 200 and a first displacement device 300, wherein the material loading platform 200 is used for fixedly loading a plate 100 to be tested, and the first displacement device 300 is horizontally disposed on the material loading platform 200 and can move in a translational manner relative to the material loading platform 200. The first displacement device 300 is provided with a loading mechanism 310 and a pressure head 320 connected with the loading mechanism 310, the loading mechanism 310 is used for applying pressure to the pressure head 320, so that the pressure head 320 presses against the plate material 100 to be tested on the material loading table 200, and when the first displacement device 300 drives the loading mechanism 310 to move in a translation manner, the pressure head 320 performs scoring on the plate material 100 to be tested. The testing apparatus further includes a first displacement sensor 330 and a second displacement sensor 340, wherein the first displacement sensor 330 is used for detecting the distance of the scratch mark of the indenter 320 on the plate material 100 to be tested, i.e. the length of the formed scratch mark, and the second displacement sensor 340 is used for detecting the depth of the indenter pressed into the plate material 100 to be tested, i.e. the depth of the scratch mark.
In some embodiments, the first displacement sensor 330 and the second displacement sensor 340 are both fixedly coupled to the ram 320. This allows the ram 320 to conform to the movement of the sensor thereon to improve measurement accuracy.
Referring to fig. 2, fig. 2 shows a flow of steps of an embodiment of the method for testing scratch resistance of a plate according to the present invention, and the method for testing scratch resistance of a plate includes the following steps:
step S102, fixing the board 100 to be tested.
Specifically, the plate 100 to be tested is placed on the material loading platform 200 and fixed to the material loading platform 200, and it is understood that the plate 100 to be tested is attached to the table top of the material loading platform 200 by fixing the plate to be tested to the material loading platform 200, so as to obtain a better support of the material loading platform, and to prevent the plate 100 to be tested from deviating, warping and the like in the scribing process to cause inaccurate test results. It should be noted that the shape of the table top of the loading table 200 is larger than the shape of the plate 100 to be tested, so as to provide sufficient support for the plate 100 to be tested, and prevent the unsupported portion of the plate 100 to be tested from being cracked due to insufficient support when the plate receives the pressure applied by the pressure head 320.
In some embodiments, the thickness of the board 100 to be tested is 0.1mm to 1.1mm, such as 0.1mm, 0.5mm, or 1.1mm, and the thickness of the board to be tested is not limited herein.
And step S104, scribing scratches with preset length on the surface of the plate 100 to be tested by using the pressure head 320 with the tip with constant force or continuous loading force, and monitoring the depth change data of the pressure head 320 pressed into the plate 100 to be tested in real time.
Specifically, referring to fig. 1 and 2, a pressure is applied to the plate material 100 to be tested by the indenter 320, and the direction of the pressure is perpendicular to the surface of the plate material 100 to be tested, so that the indenter 320 scratches a scratch mark with a preset length on the surface of the plate material 100 to be tested, and the length of the scratch mark can be obtained by the first displacement sensor 330, which is arranged on the indenter 320 and is used for detecting the horizontal movement distance of the indenter 320, so that the first displacement sensor 330 is always kept relatively stationary with the indenter 320 during the scratching process of the indenter 320, and the horizontal movement distance of the surface of the plate material 100 to be tested is consistent with the indenter 320, and the horizontal movement distance of the indenter 320 can be accurately detected.
The depth of the scratch can be obtained by the second displacement sensor 340 which is arranged on the indenter 320 and can detect the displacement of the indenter 320 in the direction perpendicular to the direction of the scratching surface of the plate 100 to be tested, so that the advantage of the arrangement is that the second displacement sensor 340 is kept relatively still with the indenter 320 all the time in the process of scratching, the movement in the direction perpendicular to the direction of the scratching surface of the plate 100 to be tested is kept consistent with the movement of the indenter 320, the movement distance of the indenter 320 in the direction perpendicular to the scratching surface of the plate 100 to be tested can be accurately detected, that is, the depth of the position of the indenter 320 for scratching the scratch can. Through the depth of monitoring the mar in real time in the process of scratching the panel, compare in going a plurality of sampling points on the mar again after the mar is produced among the conventional technical means, this testing method can output the test result after the mar sculpture is accomplished, and the testing process is convenient, and accords with the scratch condition that awaits measuring panel 100 is actual more.
And step S106, calculating the average depth value or the average width value of the scratches on the board 100 to be tested according to the depth change data, and evaluating the scratch resistance of the board 100 to be tested according to the average depth value or the average width value of the scratches. The smaller the average depth value or the average width value of the board 100 to be tested is measured, the stronger the scratch resistance of the board 100 to be tested is.
Referring to fig. 3, in some embodiments, the indenter 320 scores the surface of the sheet material 100 to be tested with a constant force for a predetermined length/0Step S106 includes:
step S1062, recording the scribing distance l and the scribing depth h corresponding to the scribing distance l in the scribing forming process to obtain an h-l curve;
step S1064, performing integral processing according to the h-l curve to obtain the average depth value of the scratch
In addition, f is0Initial pressure, f, referring to the initial position of the scratchlIs the termination pressure at the termination point of the scratch.
In the embodiment, the advantage of obtaining the average depth of the scratch through the method is that compared with the conventional technical means, the method for averaging the values of the sampling points by removing a plurality of sampling points on the scratch can avoid the influence of the randomness of a single sampling point on a test result to a great extent through using more depth values of the scratch in the integration process, the test result is more accurate, and the scratch resistance of the plate can be objectively reflected.
In the present embodiment, the average depth value of the scratch is obtained
For evaluating the scratch resistance of the panel 100 to be tested, in particular for determining the average depth value of the scratch of the panel under the same pressure
The smaller the size, the better the scratch resistance of the plate; on the contrary, under the same pressure, the average depth value of the scratch is measured by the plate
The larger the size, the less the scratch resistance of the sheet. Accordingly, the average depth value of the scratch of the plate is measured under different applied pressures
If the pressure is higher, the scratch resistance of the plate is better; on the contrary, the average depth value of the scratch of the plate is measured under different applied pressures
At the same time, the less pressure applied, the plate is indicatedThe worse the scratch resistance of the material.
In some embodiments, the variance of the scratch depth of a panel when it is scribed under constant pressure can also be determined
In the present embodiment, it is preferred that,
can be used to evaluate the scratch resistance stability of the panel 100 to be tested,
the smaller the resistance to scratching, the better the panel 100 to be tested.
In some embodiments, the tip of the indenter 320 is conical, the tip of the indenter 320 has a cone angle of 2 θ, and the average width of the scratches can be obtained according to the geometrical relationship of the indenter 320
The advantage of obtaining the width of mar through this kind of mode lies in, compares in the width of directly getting the mar, when having avoided directly getting, because of the edge breakage of mar leads to the boundary of mar to be difficult to define, and the mar width that records is difficult to regard as the index of measuring panel scratch resistance ability. Meanwhile, in the method for obtaining the average width of the scratch of the plate 100 to be tested, the average depth value of the scratch is obtained by combining the geometric relation of the tip cone of the pressure head 320, so that compared with the conventional technical means that a plurality of sampling points are removed from the scratch after the scratch is generated, and the method for averaging the values of the sampling points is adopted, the testing method is as described above, the testing result can be output after the scratch is carved, the testing process is convenient and fast, and the actual scratch condition of the plate 100 to be tested is better met.
In the present embodiment, the average width value of the obtained scratch
For evaluating the scratch resistance of the panels 100 to be tested, in particular at the same pressureUsing the measured average width value of the scratch
The smaller the size, the better the scratch resistance of the plate; on the contrary, under the same pressure, the average width value of the scratch is measured on the plate
The larger the size, the less the scratch resistance of the sheet. Accordingly, the average width of the scratch of the plate is measured under different applied pressures
If the pressure is higher, the scratch resistance of the plate is better; on the contrary, the average width value of the plate scratch is measured under different applied pressures
In the case of the same, the smaller the pressure applied, the poorer the scratch resistance of the plate.
In some embodiments, the taper angle of the tip of the indenter 320 is in the range of 60 ° -140 °, i.e., 30 ° ≦ θ ≦ 70 °, and within this taper angle range, the indenter 320 will not crack the sheet to be tested due to too small a taper angle, nor will it be difficult to form scratches on the sheet due to too large a taper angle when scoring the sheet to be tested 100.
In some embodiments, the width variance of the scratch mark when the plate is subjected to the constant pressure scratch is also obtained
In the present embodiment, it is preferred that,
can be used to evaluate the scratch resistance stability of the panel 100 to be tested,
the smaller the resistance to scratching, the better the panel 100 to be tested.
As shown in fig. 4, in some embodiments, when the indenter 320 scratches the surface of the sheet material 100 to be tested with a preset length of scratches at a continuously increasing pressure f, the step S106 includes:
step S1063, recording the continuously increasing pressure f and the scratch depth value h corresponding to the continuously increasing pressure f in the scratch forming process to obtain an h-f curve;
step S1065, performing integral processing according to the h-f curve to obtain the average depth value of the scratch
In addition, f is0Initial pressure, f, referring to the initial position of the scratchlIs the termination pressure at the termination point of the scratch.
The advantage of deriving the average depth of the scratches in this way in this embodiment is that the continuous variation of the pressure applied to the panel to be tested during the generation of the scratches is more consistent with the actual stress of the scratch in the panel than in the test method in which a constant pressure is applied to the panel to be tested.
In the present embodiment, the average depth value of the scratch is obtained
For evaluating the scratch resistance of the plate 100 to be tested, specifically, the average depth value of the scratch is measured when the initial pressure and the termination pressure are the same
The smaller the size, the better the scratch resistance of the plate; on the contrary, when the initial pressure and the final pressure are the same, the average depth value of the scratch is measured on the plate
The larger the size, the less the scratch resistance of the sheet.
In some embodiments, the depth of the scratch can also be determined when the plate is scratched under constant pressureVariance of degree
In the present embodiment, it is preferred that,
can be used to evaluate the scratch resistance stability of the panel 100 to be tested,
the smaller the resistance to scratching, the better the panel 100 to be tested.
In some embodiments, the tip of the indenter 320 is conical, the tip of the indenter 320 has a cone angle of 2 θ, and the average width of the scratch is obtained according to the geometrical relationship of the indenter 320
In the present embodiment, the average width value of the obtained scratch
For evaluating the scratch resistance of the plate 100 to be tested, in particular, the average width value of the scratch is measured when the initial pressure and the termination pressure are the same
The smaller the size, the better the scratch resistance of the plate; on the contrary, under the same pressure, the average width value of the scratch is measured on the plate
The larger the size, the less the scratch resistance of the sheet.
In some embodiments, the width variance of the scratch mark when the plate is subjected to the continuously increasing pressure scratch is also obtained
In the present embodiment, it is preferred that,
can be used to evaluate the scratch resistance stability of the panel 100 to be tested,
the smaller the resistance to scratching, the better the panel 100 to be tested.
Because the tip of the pressure head 320 is conical, compared with pressure heads 320 of other shapes, when the pressure head 320 with the conical tip contacts the board 100 to be tested and scratches are made, the cross section of the pressure head 320 does not have an area in which stress concentration is easy to generate, and the stress of the contact point is more uniform, so that the influence on the scratch resistance test result of the board 100 to be tested caused by different mounting directions of the pressure heads 320 of other shapes can be avoided, and the stability of the test result of the scratch resistance test method of the board can be improved to a certain extent.
In some embodiments, the material of the indenter 320 may be selected according to the material of the plate 100 to be tested, the hardness of the material of the indenter 320 is greater than the surface hardness of the plate 100 to be tested, and the material of the indenter 320 is preferably diamond. In other embodiments, the material of the ram 320 may also be cemented carbide, and the material of the ram 320 is not limited herein.
In some embodiments, the scratch depth can also be obtained by non-contact distance measurement methods such as ultrasonic, infrared, laser, and the like. The non-contact method is advantageous in that the influence of chips generated by the slight bounce of the indenter 320 during scribing or scribing on the depth test can be avoided.
In some embodiments, the material of the board 100 to be tested may be ordinary glass, microcrystalline glass, ceramic, metal, polymer plastic, or wood, and the material of the board 100 to be tested is not limited herein.
In some embodiments, the loading platform 200 is provided with a vacuum adsorption device, and the board 100 to be tested is fixed on the loading platform 200 by vacuum adsorption.
Specifically, the sample table is provided with a plurality of adsorption holes which are uniformly distributed, and the plate 100 to be tested is fixed through negative pressure formed in the adsorption holes during adsorption. The adsorption force of the sample table can be adjusted by adjusting the negative pressure in the adsorption hole so as to adapt to the plates 100 to be tested with different rigidity and thickness, and when the plates 100 to be tested and the sample table need to be separated, the negative pressure in the adsorption hole is adjusted to be zero or positive pressure. The advantage of setting up like this for the adsorption affinity evenly distributed that panel received, prevent to await measuring panel 100 and slide or warp and influence the accuracy of testing result in the testing process. Meanwhile, the sample table is provided with the plurality of adsorption holes which are uniformly distributed, so that the sample table can be adapted to the plates 100 to be tested with different sizes, and clamps do not need to be designed for the plates 100 to be tested with different sizes.
In other embodiments, the board 100 to be tested and the sample stage may be connected by an adhesive method, such as fixed attachment by paraffin, UV curable glue or double-sided adhesive without trace, and the method for adhering the board 100 to be tested and the sample stage is not limited herein. The plate 100 to be tested is bonded with the sample table in a bonding mode, and the bonding mode has the advantages that a complex air path can be prevented from being arranged inside the sample table, and the structure of the sample table is simplified.
In some embodiments, the pressure is applied by a controllable air cylinder or oil cylinder, and the output direction of the air cylinder or oil cylinder is set to be the same with that of the plate material 100 to be tested, so that the pressure loading perpendicular to the direction of the scribing scratch surface of the plate material to be tested is realized by adjusting the output. By means of the pressure applying mode, the pressure can be adjusted at will, and the adjusting process is simple.
In other embodiments, pressure may also be applied to the sheet material 100 to be tested by adding a weight to the indenter 320. By this way of applying pressure, the structure of the testing mechanism can be simplified.
In some embodiments, the material of the board 100 to be tested may be ordinary glass, microcrystalline glass, ceramic, metal, polymer plastic, or wood, and the material of the board 100 to be tested is not limited herein.
In some embodiments, the continuously increasing pressure f ranges from 0.1N to 100N, such as 0.1N, 5N, 25N or 100N, preferably from 0.1N to 50N, such as 0.5N, 1N, 20N or 50N; the loading speed of the continuously increasing pressure f is in the range of 6N/min to 60N/min, such as 6N/min, 15N/min, 45N/min or 60N/min, preferably 6N/min to 30N/min, such as 10N/min, 20N/min, 25N/min or 30N/min. By adjusting the range of pressure values, it is ensured that the indenter 320 can leave a continuous scratch on the surface of the sheet material 100 to be tested.
In some embodiments, the starting pressure f of the scratch start position0The value range of (a) is 0.1N-5N, such as 0.1N, 0.5N, 1N or 5N, and by adjusting the initial pressure, it is ensured that the indenter 320 can leave a scratch at the scratch initial position, and for a plate with higher surface strength, a larger initial pressure can be selected.
In some embodiments, the scoring distance may be preset prior to scoring of the score, the scoring distance being in the range of 50mm to 200mm, such as 50mm, 100mm, 150mm or 200mm, to obtain a sufficiently long score to meet testing requirements. During the formation of the scratch, the scratching speed can be adjusted, and the scratching speed is in a range of 0.1mm/s-20mm/s, such as 0.1mm/s, 8mm/s, 15mm/s or 20mm/s, preferably 0.5mm/s-10mm/s, such as 0.5mm/s, 1mm/s, 5mm/s or 10mm/s, so as to meet the test requirements of different scratching speeds.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A method for testing scratch resistance of a plate is characterized by comprising the following steps:
fixing a plate to be tested;
scratching the surface of the plate to be tested by a preset length by using a pressure head with a tip at constant pressure or continuously increasing pressure, and monitoring depth change data of the pressure head pressed into the plate to be tested in real time;
and calculating the average depth value or the average width value of the scratches on the plate to be tested according to the depth change data.
2. The method for testing scratch resistance of a panel according to claim 1, wherein when the indenter scores the surface of the panel to be tested for a predetermined length of scratch with a constant pressure, the predetermined length of scratch is l0Calculating an average depth value or an average width value of the scratches on the to-be-tested plate according to the depth variation data, including:
recording the scribing distance l and the scribing depth h corresponding to the scribing distance l in the scribing forming process to obtain an h-l curve;
performing integral treatment according to the h-l curve to obtain the average depth of the scratch
3. The method for testing the scratch resistance of a plate according to claim 2, further comprising the steps of: according to the average depth of the scratch
Obtaining the variance of the scratch depth
4. The method for testing the scratch resistance of a plate according to claim 2, wherein the tip of the indenter is conical, the taper angle of the tip of the indenter is 2 θ, and the average width of the scratch can be obtained according to the geometric relationship of the indenter
5. The method for testing the scratch resistance of a plate according to claim 4, further comprising the steps of:
according to the average width of the scratch
Obtaining the variance of the scratch width
6. The method as claimed in claim 1, wherein when the indenter scores the surface of the board to be tested for a predetermined length of scratch with a continuously increasing pressure f, the scratch is initiated at a starting pressure f0The end pressure at the end position of the scratch is flCalculating an average depth value or an average width value of the scratches on the to-be-tested plate according to the depth variation data, including:
recording the continuously increasing pressure f and the corresponding scratch depth h in the scratch forming process to obtain an h-f curve;
performing integral treatment according to the h-f curve to obtain the average depth of the scratch
7. The method for testing the scratch resistance of a plate according to claim 6, further comprising the steps of: according to the average depth of the scratch
Obtaining the variance of the scratch depth
8. The method for testing the scratch resistance of a plate as claimed in claim 6, wherein the tip of the indenter is conical, the taper angle of the tip of the indenter is 2 θ, and the average width of the scratch can be obtained according to the geometric relationship of the indenter
9. The method for testing the scratch resistance of a plate according to claim 8, further comprising the steps of: according to the average width of the scratch
Obtaining the variance of the scratch width
10. The method for testing scratch resistance of a plate material according to claim 4 or claim 8, wherein θ is 30 ° ≦ θ ≦ 70 °.
11. The method for testing scratch resistance of a plate material according to claim 1, wherein in the step of scribing the scratch of the surface of the plate material to be tested for a preset length by using a tip-equipped indenter at a constant pressure or a continuously increasing pressure, the direction in which the indenter applies force to the plate material to be tested is perpendicular to the surface of the scribed scratch of the plate material to be tested.
12. The method for testing the scratch resistance of the plate according to claim 6, wherein the continuously increasing pressure f is in a range of 0.1N to 100N; the value range of the loading speed of the continuously increasing pressure f is 6N/min-60N/min.
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