CN101487746B - EMI(electromagnetic shielding) product compression force test method - Google Patents
EMI(electromagnetic shielding) product compression force test method Download PDFInfo
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- CN101487746B CN101487746B CN200810141737XA CN200810141737A CN101487746B CN 101487746 B CN101487746 B CN 101487746B CN 200810141737X A CN200810141737X A CN 200810141737XA CN 200810141737 A CN200810141737 A CN 200810141737A CN 101487746 B CN101487746 B CN 101487746B
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Abstract
The present invention discloses a novel compressive force test method, namely inflection point judgment method capable of, in EMI products, completely avoiding the influence of 'deformation of the products', 'setting of an inlet force' and 'test errors of the original height of the products' on the test results of the compressive force of the products. The method mainly comprises that, by adding a test groove, the depth of the groove can be adjusted to be a test compression depth required by a customer; at each test the product needs to be placed in the groove at first and then a force sensor is compressed to the top of the groove; on account of unchanged compression quantity and sharp increase of the compressive force when compressing the groove to the top, an obvious inflection point appears in a two-dimensional coordinate graph (in which the compression quantity is the X-coordinate and the compressive force is the Y-coordinate) drawn by a tester, and the Y-coordinate value of the inflection point is the final result numerical value as required by the test. The inflection point judgment method can effectively and greatly improve the precision and accuracy of the test results of the compressive force of the products.
Description
Affiliated technical field
The present invention relates to the force of compression test new method of a kind of EMI (electromagnetic screen) product.
Background technology
At present, the force of compression test all-purpose method of EMI product is that original height, the counting yield decrement by measurement products obtains by the force of compression of tester drafting and the test data two-dimensional coordinate figure (wherein decrement is a horizontal ordinate, and force of compression is an ordinate) of decrement then.There are many shortcomings in such product force of compression method of testing: as, the setting of inlet power, the test error of product original height all can produce very big influence to test result in the distortion of product, the software.
Summary of the invention
For the existing above many shortcomings of the force of compression test that solves present EMI product, the invention provides a kind of novel force of compression method of testing, this method of testing can be eliminated the influence of above three factors to test result fully, thereby significantly improves the degree of accuracy and the accuracy of force of compression test result.
The technical solution adopted for the present invention to solve the technical problems is: increase a test trough, the depth-adjustment of groove is whole to the required test compression degree of depth requirement of client; Test each time, product need be placed on earlier in this groove, makes force transducer be compressed to the top of groove then; Because when force transducer was compressed to the top of groove, decrement was constant, and force of compression sharply increases; (decrement is a horizontal ordinate so in decrement-force of compression two-dimensional coordinate figure that tester is drawn, force of compression is an ordinate), a flex point that significantly sharply rises suddenly can appear, and the ordinate value of this flex point is exactly the required net result numerical value of test, flex point criterion that Here it is (as Fig. 1).
The flex point criterion is better than the ultimate principle explanation of common test mode: inlet power is that a software begins to adopt signal a little.In test process, when the force of compression value arrived inlet power value, software was to begin to adopt a drawing zero point to decrement (horizontal ordinate) zero clearing and with this position.Universal method is to utilize two-dimensional coordinate figure to obtain force of compression (ordinate) value by calculating decrement (abscissa value), the EMI product has better elastic, when force transducer is exerted pressure to inlet power to it, it has been compressed certain decrement, and software handle decrement this moment is as zero point, the deviations that must cause decrement, decrement deviations then must cause final force of compression value deviation; After the sample distortion, shape has certain bending, and when it was compressed into inlet power, sample sweep and test platform still had the space, software zero clearing this moment is again adopted the deviations that a little also not so can cause decrement, and the final force of compression value of gained also must have deviation; The EMI product has better elastic, and this brings very big difficulty for the accurate measurement of its height, and the measuring error of height can cause the location of decrement among the two-dimensional coordinate figure (horizontal ordinate) inaccurate equally, and then causes the value deviation of force of compression (ordinate).The present invention can directly test out the real compressive force after sample is compressed into specified altitude, do not obtain force of compression (ordinate) by location decrement (horizontal ordinate), the deviations of force of compression is to not at all influence of this method, therefore the influence of above 3 kinds of factors be can fundamentally avoid fully, thereby the degree of accuracy and the accuracy of test result significantly improved.
Description of drawings
Further specify this use is novel below in conjunction with drawings and Examples.
In the accompanying drawing:
Fig. 1 force-displacement curve figure
Fig. 2 case is conducting foam common test method X-Y scheme 1.
Fig. 3 case is conducting foam flex point criterion X-Y scheme 1.
Fig. 4 case is reed common test method X-Y scheme 2.
Fig. 5 case is reed flex point criterion X-Y scheme 2.
Fig. 6 flex point criterion test platform is the force transducer 3. 4. test platform of test trough of anchor clamps that 2. is connected in force transducer 1.
Fig. 7 test trough is 6. product of test trough 5.
Embodiment:
4. increase a test trough 3. at test platform on as Fig. 6,7, the degree of depth of groove satisfies the required test compression degree of depth requirement of client; Each time the test, product 6. need be placed on earlier test trough 3. in, make force transducer 1 be compressed to test trough top 3. then.
Embodiment one: new method of testing---and the flex point criterion is eliminated the influence of software inlet power to test result.
Get the long EMI conducting foam of 50mm D04 product, the product height is 3.6mm, and decrement 1.6mm is set.Take universal testing method, different inlet power are set.Test result such as Fig. 2:
It is as shown in the table to record data:
| The curve numbering | Inlet power value (N) | Test result (kgf) |
| 1 | 0.1 | 1.01 |
| 2 | 0.2 | 1.20 |
| 3 | 0.5 | 1.31 |
| 4 | 1 | 1.39 |
| 5 | 2 | 1.52 |
Above mean value 1.286, maximum deviation are 21.5%.
Other gets the long EMI conducting foam of a 50mm D04 product, and the test trough degree of depth is set to 2mm, and different inlet power are set.Adopt new method of testing---flex point criterion test result such as Fig. 3:
Record shown in data see the following form:
| The curve numbering | Inlet power value (N) | Test result (kgf) |
| 1 | 0.1 | 0.90 |
| 2 | 0.2 | 0.90 |
| 3 | 0.5 | 0.90 |
| 4 | 1 | 0.90 |
| 5 | 2 | 0.90 |
Above mean value 0.9, deviation are 0
Embodiment two: new method of testing---and the flex point criterion is eliminated the influence of the distortion of sample to test result.
Get the long EMI H06 of 50mm reed, height 2.75mm adopts universal method, and it is 0.75 that decrement is set, and result before and after the test distortion is as Fig. 4
It is as shown in the table to record data:
| The curve numbering | Test result (kgf) |
| Before 1 distortion | 1.03 |
| After 2 distortion | 0.86 |
Above mean value 0.945, maximum deviation are 9%.
Other gets the long EMI H06 of 50mm reed, and the test trough degree of depth is set to 2mm, adopts new method of testing---result before and after the flex point criterion test distortion, and as Fig. 5
It is as shown in the table to record data:
| Numbering | Test result (kgf) |
| Before 1 distortion | 1.91 |
| After 2 distortion | 1.91 |
Above mean value 1.91, maximum deviation are 0.
Claims (2)
1. EMI product force of compression method of testing, it is characterized in that: increased a product force of compression special test groove, the degree of depth of this test trough satisfies the compression depth of customer requirement, when testing, product is placed on earlier in this test trough, makes force transducer be compressed to the top of this test trough then; When force transducer is compressed to the top of test trough, decrement inconvenience, force of compression sharply increases, what this tester was drawn is horizontal ordinate with the decrement, force of compression is among the two-dimensional coordinate figure of ordinate, a flex point that significantly sharply rises suddenly can occur, and the ordinate value of this flex point is exactly the required net result numerical value of test.
2. EMI product force of compression method of testing according to claim 1 is characterized in that: the product force of compression is to carry out reading by the figure flex point in the two-dimensional coordinate of decrement and force of compression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810141737XA CN101487746B (en) | 2008-08-29 | 2008-08-29 | EMI(electromagnetic shielding) product compression force test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810141737XA CN101487746B (en) | 2008-08-29 | 2008-08-29 | EMI(electromagnetic shielding) product compression force test method |
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| Publication Number | Publication Date |
|---|---|
| CN101487746A CN101487746A (en) | 2009-07-22 |
| CN101487746B true CN101487746B (en) | 2011-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810141737XA Expired - Fee Related CN101487746B (en) | 2008-08-29 | 2008-08-29 | EMI(electromagnetic shielding) product compression force test method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2032713U (en) * | 1988-02-11 | 1989-02-15 | 上海统益袜厂 | Detector for standard load of weft-knitted fabric transverse drawing device |
| CN1169365A (en) * | 1996-04-25 | 1998-01-07 | 三菱化学巴斯夫株式会社 | Process for producing expanded molding products having high-density skin |
| JP2000287944A (en) * | 1999-04-06 | 2000-10-17 | Tokai Rika Co Ltd | Pressure sensor block for catheter |
| WO2008089208A2 (en) * | 2007-01-16 | 2008-07-24 | Baker Hughes Incorporated | Distributed optical pressure and temperature sensors |
-
2008
- 2008-08-29 CN CN200810141737XA patent/CN101487746B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2032713U (en) * | 1988-02-11 | 1989-02-15 | 上海统益袜厂 | Detector for standard load of weft-knitted fabric transverse drawing device |
| CN1169365A (en) * | 1996-04-25 | 1998-01-07 | 三菱化学巴斯夫株式会社 | Process for producing expanded molding products having high-density skin |
| JP2000287944A (en) * | 1999-04-06 | 2000-10-17 | Tokai Rika Co Ltd | Pressure sensor block for catheter |
| WO2008089208A2 (en) * | 2007-01-16 | 2008-07-24 | Baker Hughes Incorporated | Distributed optical pressure and temperature sensors |
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| CN101487746A (en) | 2009-07-22 |
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Granted publication date: 20110706 Termination date: 20170829 |