CN110231222A - A method of the exfactory inspection of disc insulator mechanical performance is carried out using indentation method - Google Patents
A method of the exfactory inspection of disc insulator mechanical performance is carried out using indentation method Download PDFInfo
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- CN110231222A CN110231222A CN201910420315.4A CN201910420315A CN110231222A CN 110231222 A CN110231222 A CN 110231222A CN 201910420315 A CN201910420315 A CN 201910420315A CN 110231222 A CN110231222 A CN 110231222A
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- disc insulator
- residual stress
- mechanical performance
- insulator
- measuring point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
-
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- General Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Insulators (AREA)
- Electric Cable Installation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
A method of the exfactory inspection of disc insulator mechanical performance being carried out using indentation method, obtains the actual value of GIS disc insulator surface residual stress as the foundation of evaluation insulation protonatomic mass using indentation method residual stress test system.Relative to traditional method for carrying out insulator mechanical performance delivery test using hydrostatic(al) process, carrying out delivery test to disc insulator mechanical performance using indentation method stress test system is a kind of micro- loss measurement means, the destruction of unrepairable will not be caused to product, the use for not influencing detection disc insulator, reduces the cost of test stage；It can reflect the curing molding quality of epoxy material by the mechanics parameter of product itself, criteria of quality evaluation is more intuitive, reliably；The distribution situation of surface residual stress is reflected by multimetering, the resulting data for evaluating product quality are richer more comprehensively；Finally, detection device is small in size, light-weight, structure is simple, swift to operate, and the efficiency of detection work can be improved.
Description
Technical field
The invention belongs to the processing and manufacturing technologies of power equipment, are related to the assessment of GIS disc insulator mechanical performance,
A kind of more particularly to method for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method.
Background technique
Operating experience shows that the residual stress generated during manufacturing for extra-high voltage GIS disc insulator is to lead
Cause the key factor that it is damaged at work.And currently, carrying out disc insulator mechanical strength delivery test and scene friendship
It is hydraulic pressure is applied in the disc insulator concave surface of selection, record disc insulator occurs broken by the water pressure test when connecing test
The pressure born when splitting judges a collection of insulator according to the standard that pressure breakdown strength in national standard Q/GDW 11127-2013 is tested
Mechanical performance it is whether qualified.This detection means has the following disadvantages: first, can cause to the insulator of detection can not
The damage of reparation, disc insulator detected cannot be used continuously, and keep testing cost excessively high；Second, cannot directly it pass through
The mechanics parameter of insulator itself is able to bear most to reflect the curing molding quality of epoxy material according to insulator
For big external load from a side illustration manufacturing quality, evaluation method is not intuitive enough；Third, the destruction hydraulic pressure number that hydrostatic(al) process obtains
According to the quality that can only reflect disc insulator most weakness, it not can reflect disc insulator epoxy moieties and solidify entirety
Uniformity.4th, the equipment volume for hydrostatic(al) process detection is big, and quality weight, cost is high, complicated for operation.
Currently, being badly in need of one kind under the premise of not causing damage to insulator substantially in GIS disc insulator manufacturing field
Using residual stress level as the detection method of the evaluation insulator quality of production and mechanical performance foundation.
Instantly, the method for measuring residual stress in workpiece mainly has physical measurement and two kinds of mechanical measurement.Commonly
Physics measuring method has x-ray method and supercritical ultrasonics technology；The method of common mechanical measurement residual stress has a boring method, ring core method,
And the indentation method of recent domestic initiation；Wherein x-ray method is only applicable to the residual stress of measurement crystalline material, ultrasonic wave rule
It is only applicable to isotropic material.Epoxy material used in disc insulator is to be doped with a large amount of Al2O3Macromolecule composite wood
Material is also not belonging to isotropic material neither crystalline material, therefore to cannot be used for GIS benzvalene form exhausted for x-ray method and supercritical ultrasonics technology
The residual stress test of edge epoxy material.On the other hand, the boring method in mechanical measurement and ring core method are respectively necessary for
Insulator surface drilling hole and groove cause insulator that arcing fault of discharging occurs during use, it is exhausted to influence GIS benzvalene form
Edge continues to use.And a kind of residual stress measuring method of the indentation method as micro- damage, to the shadow of disc insulator when measurement
It is loud then can almost ignore, therefore select indentation method that there is very big advantage come the residual stress for measuring GIS disc insulator.
Summary of the invention
It is an object of the invention to be directed to above-mentioned the problems of the prior art, provide a kind of exhausted using indentation method progress benzvalene form
The method of edge mechanical performance exfactory inspection according to resulting disc insulator surface residual stress specific value and its is insulating
The distribution situation in sublist face evaluates the mechanical performance of insulator, and swift to operate, at low cost, evaluation result is accurate and reliable.
To achieve the goals above, the technical solution adopted by the present invention the following steps are included:
Step 1 obtains calibration curve by calibration experiment, and parameters obtained is imported impression strain testing instrument, completes instrument
Setting；
Step 2 selects measuring point on surveyed disc insulator, and more measuring point is set in the position that stress is more concentrated；
Step 3, the residual stress data for first obtaining single measuring point, then obtain the residual stress distribution on disc insulator surface
Situation；
The maximum value σ for all disc insulator surface measuring point residual stress that step 4, basis obtainmax, average value σavSentence
The residual stress level of disconnected insulator, numerical value is bigger represent insulator generate in process of production residual stress degree it is tighter
Weight；According to the very poor σ of all disc insulator surface measuring point residual stressRJudge the uniformity of insulator residual stress distribution,
Numerical value is bigger, and the residual stress numerical value difference for representing each position of insulator is bigger, illustrates that material solidification is more uneven.
The casting in calibration mold of step 1 use material identical with disc insulator obtains calibration sample, from mark
The centre for determining sample starts, and pastes two to foil gauge to both ends with the spacing not less than 20mm, selects -0.3 σy、-0.5σy、
Zero stress, 0.3 σy、0.5σy、0.7σyWith 0.8 σyThis 7 stress levels are demarcated, σyRefer to the yield strength of material, often
2 points are at least hit under a stress level, and the data obtained is depicted as calibration curve by the fitting of multinomial cube and are obtained each
Parameters obtained is imported impression strain testing instrument by calibration coefficient, and the setting of impression strain testing instrument is completed after saving.
The position that stress is more concentrated in the step 2 is disc insulator convex surface at metal center inserts and diameter
At the close metal flange in the biggish position of radian and disc insulator convex surface and the biggish position of radial arc.
Step 2 is disc insulator convex surface is at metal center inserts and 1- is successively pasted in the biggish position of radial arc
No. 4 foil gauges, disc insulator convex surface is at metal flange and No. 5-8 strain is successively pasted in the biggish position of radial arc
Piece；
σmax=MAX (σ1 σ2 σ3 σ4 σ5 σ6 σ7 σ8)；
σmin=MIN (σ1 σ2 σ3 σ4 σ5 σ6 σ7 σ8)；
σR=σmax-σmin。
Single measuring point and other measuring points are selected successively to carry out surface preparation, paste foil gauge, manufacture pressure in the step 3
Trace and data processing obtain the residual stress data of single measuring point and the residual stress distribution on disc insulator surface.
Step 3 specific steps are as follows: 1) clean measuring point and its peripheral region, and polish flat, be smooth；2) it will answer
Become piece to be pasted at measuring point, foil gauge substrate and contacting at impression strike are cut off in the range of apart from striking point 1mm-2mm；
3) foil gauge is connect with impression strain testing instrument；4) impression is manufactured on foil gauge；5) it records and arranges measurement data.
Connection at each standardized knife cutting foil gauge substrate of position blade apart from striking point 1mm, 2mm and impression strike
System.
Compared with prior art, the present invention is with following the utility model has the advantages that carrying out disc insulator machinery using indentation method
Performance exfactory inspection is a kind of micro- loss measurement means, and the destruction of unrepairable will not be caused to product, has substantially no effect on detection basin
The use of formula insulator greatly reduces the cost of test stage.Secondly, reflecting epoxy by the mechanics parameter of product itself
The curing molding quality of material, criteria of quality evaluation is more intuitive, reliably.Again, surface residual is reflected by multimetering
The distribution situation of stress, the obtained data for evaluating product quality are richer, more comprehensively, are conducive to do product quality
More scientific evaluation out；Finally, detection device is small in size, light-weight, structure is simple, swift to operate, can improve detection work
Efficiency.
Detailed description of the invention
The distributing position schematic top plan view of Fig. 1 foil gauge；
The distributing position schematic front view of Fig. 2 foil gauge；
Fig. 3 disc insulator mechanical performance exfactory inspection flow chart of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
Currently, being directed to the means of GIS disc insulator mechanical performance delivery test, disc insulator surface neither can determine that
The specific value of residual stress, it is also difficult to reflect the distribution situation of surface residual stress, this gives one kind thus
Following step is specifically included referring to Fig. 3 using the method that indentation method stress test system carries out the exfactory inspection of GIS disc insulator
It is rapid:
Step 1: using material identical with GIS disc insulator, casting obtains calibration sample in calibration mold.From mark
Determine sample centre to start, pastes what Zhonghang Electrical Measuring Instrument Co Ltd produced to both ends with the spacing not less than 20mm
Two to foil gauge.- 0.3 σ of selection selectiony、-0.5σy, zero stress, 0.3 σy、0.5σy、0.7σyWith 0.8 σyThis 7 stress levels into
Rower is fixed, wherein σyFor the yield strength of material.Each stress state at least hits 2 points.The data obtained is pressed into multinomial three
Power fitting is depicted as calibration curve and and obtains each calibration coefficient.Measuring stress instrument is opened, according to the operation of measuring stress instrument
Illustrate, each parameter, the residual stress test that can be used to after preservation are sequentially input in DATA file；
Step 2: selecting measuring point on surveyed disc insulator.
Since the position that disc insulator upper stress is more concentrated is located at radian larger part, in order to sufficiently react insulation
Save the cost while handset tool performance quality, sets more measuring point in radian larger part, the measuring point setting at other positions compared with
It is sparse.Paste position referring to Fig. 1-2, on disc insulator convex surface at metal center inserts the biggish position of radial arc
Successively paste 1-4 foil gauge；On disc insulator convex surface, the biggish position of radial arc is successively pasted at metal flange
5-8 foil gauge.
Step 3: for the single measuring point selected in step 2, according to indentation method test macro operation instructions successively into
Row surface prepares, pastes foil gauge, manufacture impression and data processing to obtain the residual stress data of single measuring point.
1) test point and peripheral region are cleaned, and is polished flat, is smooth；2) it is produced using Beijing Chemical Plant
502 glue by ready strain gauge adhesion at tested point, apart from striking point 1 within the scope of 2mm with each standardized knife of blade with
Cut off foil gauge substrate and contacting at impression strike；3) foil gauge is connect with impression strain testing instrument；4) according to indentation method
Residual stress test system specification manufactures impression on foil gauge；5) it records and arranges measurement data.
Step 4: repeating step 3 in other measuring points that step 1 selects, obtain the residual stress distribution feelings of insulator surface
Condition.
Step 5: according to the maximum value σ of the resulting all GIS disc insulators surface measuring point residual stress of step 4max, it is flat
Mean value σavJudge the residual stress level of insulator, the bigger journey for representing insulator and generating residual stress in process of production of numerical value
Degree is more serious, and the insulator quality of production is poorer；According to the resulting all GIS disc insulators surface measuring point residual stress of step 4
Very poor σRJudge the uniformity of the residual stress distribution of insulator, the bigger remnants for representing each position of disc insulator of numerical value
Stress numerical difference is bigger, and material solidification is more uneven, and equipment quality is poorer.Calculation formula is as follows:
σmax=MAX (σ1 σ2 σ3 σ4 σ5 σ6 σ7 σ8)；
σmin=MIN (σ1 σ2 σ3 σ4 σ5 σ6 σ7 σ8)；
σR=σmax-σmin。
The foregoing is merely presently preferred embodiments of the present invention, not to carry out restriction in any form to the present invention,
Those of ordinary skill in the art are not it should be understood that under conditions of departing from spirit of that invention and principle, technology of the invention
Scheme can also carry out several simple modifications and replacement, these modifications and replacement also can fall into the guarantor that claim delimited
Within the scope of shield.
Claims (7)
1. a kind of method for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method characterized by comprising
Step 1 obtains calibration curve by calibration experiment, and parameters obtained is imported impression strain testing instrument, completes instrument setting；
Step 2 selects measuring point on surveyed disc insulator, and more measuring point is set in the position that stress is more concentrated；
Step 3, the residual stress data for first obtaining single measuring point, then obtain the residual stress distribution feelings on disc insulator surface
Condition；
The maximum value σ for all disc insulator surface measuring point residual stress that step 4, basis obtainmax, average value σavJudgement is exhausted
The residual stress level of edge, numerical value is bigger represent insulator generate in process of production residual stress degree it is more serious；Root
According to the very poor σ of all disc insulator surface measuring point residual stressRJudge the uniformity of insulator residual stress distribution, numerical value is got over
The residual stress numerical value difference for representing each position of insulator greatly is bigger, illustrates that material solidification is more uneven.
2. the method according to claim 1 for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method, special
Sign is: the casting in calibration mold of step 1 use material identical with disc insulator obtains calibration sample, from calibration
The centre of sample starts, and pastes two to foil gauge to both ends with the spacing not less than 20mm, selects -0.3 σy、-0.5σy, zero
Stress, 0.3 σy、0.5σy、0.7σyWith 0.8 σyThis 7 stress levels are demarcated, σyRefer to the yield strength of material, each
2 points are at least hit under stress level, and the data obtained is depicted as calibration curve by the fitting of multinomial cube and obtain each mark
Determine coefficient, parameters obtained is imported into impression strain testing instrument, the setting of impression strain testing instrument is completed after saving.
3. the method according to claim 1 for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method, special
Sign is: the position that stress is more concentrated in the step 2 is disc insulator convex surface at metal center inserts and diameter
At the close metal flange in the biggish position of radian and disc insulator convex surface and the biggish position of radial arc.
4. the method according to claim 3 for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method, special
Sign is: step 2 is disc insulator convex surface is at metal center inserts and 1-4 is successively pasted in the biggish position of radial arc
Number foil gauge, disc insulator convex surface is at metal flange and No. 5-8 strain is successively pasted in the biggish position of radial arc
Piece；
σmax=MAX (σ1 σ2 σ3 σ4 σ5 σ6 σ7 σ8)；
σmin=MIN (σ1 σ2 σ3 σ4 σ5 σ6 σ7 σ8)；
σR=σmax-σmin。
5. the method according to claim 1 for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method, special
Sign is, single measuring point and other measuring points is selected successively to carry out surface preparation, paste foil gauge, manufacture pressure in the step 3
Trace and data processing obtain the residual stress data of single measuring point and the residual stress distribution on disc insulator surface.
6. the method according to claim 5 for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method, special
Sign is, step 3 specific steps are as follows: 1) clean measuring point and its peripheral region, and polish flat, be smooth；2) it will answer
Become piece to be pasted at measuring point, foil gauge substrate and contacting at impression strike are cut off in the range of apart from striking point 1mm-2mm；
3) foil gauge is connect with impression strain testing instrument；4) impression is manufactured on foil gauge；5) it records and arranges measurement data.
7. the method according to claim 1 for carrying out the exfactory inspection of disc insulator mechanical performance using indentation method, special
Sign is: each standardized knife cutting foil gauge substrate of position blade apart from striking point 1mm, 2mm and contacting at impression strike.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910420315.4A CN110231222A (en) | 2019-05-20 | 2019-05-20 | A method of the exfactory inspection of disc insulator mechanical performance is carried out using indentation method |
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| CN201910420315.4A CN110231222A (en) | 2019-05-20 | 2019-05-20 | A method of the exfactory inspection of disc insulator mechanical performance is carried out using indentation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113496795A (en) * | 2021-06-03 | 2021-10-12 | 南方电网科学研究院有限责任公司 | GIL post insulator and interface stress detection method thereof |
Citations (3)
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| CN1091825A (en) * | 1993-03-03 | 1994-09-07 | 中国科学院金属研究所 | Method of impact indentation assaying residual stress |
| CN1375689A (en) * | 2001-03-16 | 2002-10-23 | 中国科学院金属研究所 | Residual stress measuring method |
| CN109060546A (en) * | 2018-08-29 | 2018-12-21 | 西安交通大学 | It is a kind of using optical-fibre needle to the strain gauge means and method of the disc insulator water pressure test |
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2019
- 2019-05-20 CN CN201910420315.4A patent/CN110231222A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091825A (en) * | 1993-03-03 | 1994-09-07 | 中国科学院金属研究所 | Method of impact indentation assaying residual stress |
| CN1375689A (en) * | 2001-03-16 | 2002-10-23 | 中国科学院金属研究所 | Residual stress measuring method |
| CN109060546A (en) * | 2018-08-29 | 2018-12-21 | 西安交通大学 | It is a kind of using optical-fibre needle to the strain gauge means and method of the disc insulator water pressure test |
Non-Patent Citations (3)
| Title |
|---|
| JOHN H. UNDERWOOD: "Residual-stress measurement using surface displacements around an indentation", 《EXPERIMENTAL MECHANICS》 * |
| 吴昱怡等: "盆式绝缘子力学性能测试及分析", 《电瓷避雷器》 * |
| 王韵璐等: "圆锯片的压痕应变法残余应力测试与分析", 《林产工业》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113496795A (en) * | 2021-06-03 | 2021-10-12 | 南方电网科学研究院有限责任公司 | GIL post insulator and interface stress detection method thereof |
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