CN110907351A - Method for testing softness of soft coated abrasive tool - Google Patents

Method for testing softness of soft coated abrasive tool Download PDF

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Publication number
CN110907351A
CN110907351A CN201911185984.4A CN201911185984A CN110907351A CN 110907351 A CN110907351 A CN 110907351A CN 201911185984 A CN201911185984 A CN 201911185984A CN 110907351 A CN110907351 A CN 110907351A
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sample
pointer
softness
test
reading
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唐伟标
陈剑锋
方永瑞
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GUANGDONG LITTLE SUN SANDING MATERIAL CO Ltd
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GUANGDONG LITTLE SUN SANDING MATERIAL CO Ltd
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    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods

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Abstract

A method for testing the softness of a soft coated abrasive tool comprises the following steps: A. adjusting the levelness of the tester, adjusting the position of the sample clamp, and fixing the sample clamp; B. clamping the upper end of a sample in a sample clamp, then adjusting the load of a pointer, placing weights in weight grooves in the upper parts of the pointers, and selecting proper weights and adding positions to enable the pointers to be inclined between 2 and 8 of a dial; C. the lower end of the sample is close to the blade, a start button is pressed, the sample rod starts to rotate, and the dial reading R1 pointed by the pointer when the sample is separated from the blade is read; D. after the pointer is reset, pressing a start button again, moving the test sample to the other direction, and reading a dial reading R2 pointed by the pointer when the test sample is separated from the blade; E. averaging the data measured in the step D and the step E; F. reading R of other samples is measured; G. the softness S of each sample was calculated. The testing method can accurately test the softness of the soft coated abrasive tool.

Description

Method for testing softness of soft coated abrasive tool
Technical Field
The invention relates to a coated abrasive tool, in particular to a method for testing the softness of a soft coated abrasive tool.
Background
The soft type coated abrasive tool generally needs to test the softness of the coated abrasive tool, and particularly, various soft type abrasive cloths produced by using a textile as a substrate in a coating mode, so-called soft type abrasive cloths, which are coated abrasive tools formed by bonding abrasive materials with adhesives on the basis of the textile, have certain softness, but the existing method for testing the softness of the coated abrasive tool is not perfect, the testing steps are more, the testing process is quite complex, and the testing result of the softness is not accurate enough.
Therefore, further improvements are needed.
Disclosure of Invention
The invention aims to provide a method for testing the softness of a soft coated abrasive tool, which is simple and convenient, has accurate test result and strong practicability and overcomes the defects in the prior art.
The method for testing the softness of the soft coated abrasive tool designed according to the purpose is characterized by comprising the following steps of: the method comprises the following steps:
A. adjusting the levelness of the tester to enable the pointer of the swing rod to point to the zero position of the dial, adjusting the position of the sample clamp according to the test requirement, and fixing the sample clamp;
B. clamping the upper end of a sample in a sample clamp, clamping the sample in the middle position of a movable sample clamp, then adjusting the load of a pointer, placing weights in weight grooves in the upper parts of the pointers, and selecting proper weights and adding positions to enable the pointers to be inclined between 2 and 8 of a dial; if the selected weight and the adding position enable the pointer to be deflected outside the interval of 2-8, replacing the weight or adjusting the adding position;
C. the lower end of the test sample is close to the blade, then a power switch is turned on, a start button is pressed, the test sample rod starts to rotate, and the dial reading R1 pointed by the pointer when the test sample is separated from the blade is read;
D. after the pointer is reset, pressing a start button again, moving the test sample to the other direction, and reading a dial reading R2 pointed by the pointer when the test sample is separated from the blade;
E. taking an average value of the data measured in the step D and the step E as a reading R of the test sample;
F. repeating the steps A to E, and measuring the readings R of the other samples;
G. and C, calculating the softness S of each sample according to the reading R measured in the steps A to F.
In step G, the softness S of the sample is calculated according to the following formula:
Figure BDA0002292401720000021
wherein: s is the softness: mg, R is dial reading, D is distance from weight trough to fulcrum: mm, V is the distance from the blade tip to the central axis: mm, M is the weight of the weight: g, LRIs the ratio of the test length of the specimen to the standard length, WRIs the ratio of the width of the specimen to the standard width.
In the step A, when the sample clamp is fixed, the upper end of the sample clamp is level with the scale on the sample rod.
The method for testing the softness of the coated abrasive tool comprises the steps of fixing a sample of the coated abrasive tool on a sample clamp of a tester, adding weights with proper weight on a pointer of the tester, enabling the pointer to be inclined between 2 and 8 of a dial, reading dial readings pointed by the pointer when the sample is separated from a blade by rotating a sample rod according to a start button of the tester, changing the direction to continuously read the dial readings pointed by the pointer when the sample is separated from the blade, averaging the two readings, and finally calculating the softness of the sample of the coated abrasive tool according to a formula.
Drawings
Fig. 1 is an overall structural diagram of a tester according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating the softness test of the coated abrasive in one embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1 and 2, the method for testing the softness of the soft coated abrasive tool comprises the following steps:
A. adjusting the levelness of the tester a to enable the pointer 8 of the oscillating bar 5 to point to the zero position of the dial 6, adjusting the position of the sample clamp 4 according to the test requirement, and fixing the sample clamp 4;
B. clamping the upper end of a sample 3 in a sample clamp 4, clamping the sample 3 in the middle of a movable sample clamp 4 as much as possible, then adjusting the load of a pointer 8, placing a weight 7 in a weight groove at the upper part of the pointer 8, and selecting a proper weight 7 and an adding position to enable the pointer 8 to be inclined between 2-8 parts of a dial 6; if the pointer 8 is deviated outside the interval of 2-8 by the selected weight 7 and the adding position, replacing the weight 7 or adjusting the adding position;
C. in order to prevent the swing rod 5 from shaking when beginning to deflect, the lower end of the test sample 3 is close to the blade 1, then the power switch 10 is turned on, the test sample rod 2 starts to rotate by pressing a start button, and the reading R1 of the dial plate 6 pointed by the pointer 8 when the test sample 3 is separated from the blade 1 is read;
D. after the pointer 8 is reset, the start button is pressed again, the test sample 3 moves to the other direction (generally, the left side and the right side of the test sample 3 are tested, the left side and the right side are in one direction), and the reading R2 of the dial 6 pointed by the pointer 8 when the test sample 3 is separated from the blade 1 is read;
E. taking the average value of the data measured in the step D and the step E as the reading R of the test of the sample 3;
F. repeating the steps A to E, and measuring the readings R of the other samples 3;
G. and C, calculating the softness S of each sample 3 according to the reading R measured in the steps A to F.
The method for testing the softness of the soft coated abrasive tool generally tests 5 samples, then removes the maximum value and the minimum value of the softness test results of the 5 samples, and takes the average value as the final result of the samples.
In step G, the softness S of sample 3 is calculated according to the following formula:
Figure BDA0002292401720000031
wherein: s is the softness: mg, R is the dial 6 reading, D is the distance of the weight trough to the fulcrum 9: mm, V is the distance from the top of the blade 1 to the central axis: mm, M is the weight of weight 7: g, LRThe ratio of the test length to the standard length, W, of sample 3RThe ratio of the width of sample 3 to the standard width. Test length of sample 3Degree LtestThe length is not the actual length of the sample 3 but the scale on the sample rod 2, and the standard length of the sample 3 is Lstandard,LR=Ltest/LstandardWidth of sample 3 is WtestThe standard width of sample 3 is Wstandard,WR=Wtest/WstandardWherein L isstandardAnd WstandardIs the so-called "standard size" specified in the development of Gurley stiffness meters, and for historical reasons the Gurley stiffness units in the various standards are still based on this "standard size" to which the measurements of the other size specimens are converted for stiffness. R/10 is the sine value of the deflection angle of the swing rod 5 when the sample 3 leaves the blade 1; 1000 [ (R/10) (D/V)]M is the force to which the sample is subjected; as can be seen from the above formula, also when the dial reads R,
Figure BDA0002292401720000032
it is shown that the longer the sample 3, the higher the stiffness; the narrower sample 3, the higher the stiffness, which is linearly proportional to the width of sample 3. L in the formulastandard=76.2mm,Wstandard25.4mm and 127mm, according to the formula, if the test length L of the sample 3 istestAt 38.1mm (1.5in), the equation can be simplified to S ═ 0.043R × D × M.
In the step A, when the sample clamp 4 is fixed, the upper end of the sample clamp 4 is flush with the scale on the sample rod 2.
The testing principle of the testing method of the softness of the soft coated abrasive tool is as follows: based on the Gurley (Gurley) test method, a sample 3 with specified size is placed on a sample clamp 4 capable of swinging left and right, a certain mechanical external force is applied to the sample 3, the sample generates bending deformation under the external force, and the bending resistance required when the sample 3 leaves a pendulum blade 1 is measured; the test conditions of the test method for the softness of the soft coated abrasive tool are as follows: the samples were conditioned at 25. + -. 2 ℃ and 65. + -. 5% RH and pressed flat with 4KG pressure for 4 hours. Tester a is a swinging fabric softness tester.
The relation between the test length of the sample and the length of the sample measured by the test method is as follows:
Figure BDA0002292401720000041
the technical indexes of the test are as follows:
1. measurement range: 1.39-56888 mg (Gurley stiffness unit);
2. width of the sample: 50.8mm (2 in.);
3. sample rack swing speed: 2 r/min;
4. weight specification: 5g, 10g, 25g, 50g, 100g, 200 g;
5. distance of weight trough to fulcrum 9: dl=25.4mm,D2=50.8mm,D3=101.6mm。
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be protected by the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (3)

1. A method for testing the softness of a soft coated abrasive tool is characterized by comprising the following steps: the method comprises the following steps:
A. adjusting the levelness of the tester (a), enabling a pointer (8) of the swing rod (5) to point to the zero position of the dial (6), adjusting the position of the sample clamp (4) according to the test requirement, and fixing the sample clamp (4);
B. clamping the upper end of a sample (3) in a sample clamp (4), clamping the sample (3) in the middle position of a movable sample clamp (4), then adjusting the load of a pointer (8), placing a weight (7) in a weight groove at the upper part of the pointer (8), selecting a proper weight (7) and an adding position, and enabling the pointer (8) to be deflected between 2-8 parts of a dial (6); if the pointer (8) is deflected out of the range of 2-8 by the selected weight (7) and the adding position, replacing the weight (7) or adjusting the adding position;
C. the lower end of the test sample (3) is close to the blade (1), then a power switch (10) is turned on, a start button is pressed, the test sample rod (2) starts to rotate, and the reading R1 of a dial (6) pointed by a pointer (8) when the test sample (3) is separated from the blade (1) is read;
D. after the pointer (8) is reset, pressing a start button again, moving the test sample (3) to the other direction, and reading the reading R2 of the dial (6) pointed by the pointer (8) when the test sample (3) is separated from the blade (1);
E. taking the average value of the data measured in the step D and the step E as the reading R of the test of the sample (3);
F. repeating the steps A to E, and measuring the readings R of the other samples (3);
G. and C, calculating the softness S of each sample (3) according to the reading R measured in the steps A to F.
2. The method for testing the softness of a flexible coated abrasive article according to claim 1, wherein: in step G, the softness S of the sample (3) is calculated according to the following formula:
Figure FDA0002292401710000011
wherein: s is the softness: mg, R is the dial (6) reading, D is the distance from the weight trough to the fulcrum (9): mm, V is the distance from the top of the blade (1) to the central axis: mm, M is the weight of the weight (7): g, LRThe ratio of the test length to the standard length of the sample (3), WRThe ratio of the width of the sample (3) to the standard width.
3. The method for testing the softness of a flexible coated abrasive tool according to claim 2, wherein: in the step A, when the sample clamp (4) is fixed, the upper end of the sample clamp (4) is flush with the scale on the sample rod (2).
CN201911185984.4A 2019-11-27 2019-11-27 Method for testing softness of soft coated abrasive tool Pending CN110907351A (en)

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Publication number Priority date Publication date Assignee Title
CN202994595U (en) * 2012-12-01 2013-06-12 湖州师范学院 Young modulus measurement experimental apparatus
CN203164063U (en) * 2013-01-09 2013-08-28 南通宏大实验仪器有限公司 Heart-shaped-method fabric stiffness meter
CN103575600A (en) * 2012-08-07 2014-02-12 香港纺织及成衣研发中心有限公司 Equipment and method for measuring bidirectional bending characteristics of sheet-shaped flexible materials
CN106323763A (en) * 2016-11-23 2017-01-11 海南省农业科学院农产品加工设计研究所 Detection method for betel nut fiber softness
WO2019049590A1 (en) * 2017-09-11 2019-03-14 東レ株式会社 Fiber cord for reinforcing rubber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103575600A (en) * 2012-08-07 2014-02-12 香港纺织及成衣研发中心有限公司 Equipment and method for measuring bidirectional bending characteristics of sheet-shaped flexible materials
CN202994595U (en) * 2012-12-01 2013-06-12 湖州师范学院 Young modulus measurement experimental apparatus
CN203164063U (en) * 2013-01-09 2013-08-28 南通宏大实验仪器有限公司 Heart-shaped-method fabric stiffness meter
CN106323763A (en) * 2016-11-23 2017-01-11 海南省农业科学院农产品加工设计研究所 Detection method for betel nut fiber softness
WO2019049590A1 (en) * 2017-09-11 2019-03-14 東レ株式会社 Fiber cord for reinforcing rubber

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刘天愚: "织物柔软度测试仪", 《天津纺织科技》 *
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Application publication date: 20200324