CN107664661A - A kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind - Google Patents
A kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind Download PDFInfo
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- CN107664661A CN107664661A CN201610615194.5A CN201610615194A CN107664661A CN 107664661 A CN107664661 A CN 107664661A CN 201610615194 A CN201610615194 A CN 201610615194A CN 107664661 A CN107664661 A CN 107664661A
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- flaw echo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention relates to steel inspection field, method that specially a kind of magnetic leakage detection collection of illustrative plates compares with defect in kind.The present invention provides favourable conditions by the case where not increasing the input of cost, by summarizing execute-in-place experience, establishing flaw echo and defect corresponding relation in kind, avoiding and handled merely after there is defect, for the quick root that searches problem.The present invention is compareed by substantial amounts of magnetic leakage detection collection of illustrative plates and defect in kind, searching corresponding relation, is realized steel surface defect and is quickly confirmed that steel rolling process is rectified and improved in time, prevent the product defects of more same types.
Description
Technical field
The present invention relates to steel inspection field, method that specially a kind of magnetic leakage detection collection of illustrative plates compares with defect in kind.
Background technology
Bar：Cross section is circular one of steel, the important kind of steel products, is widely used in building and product work
Industry.Magnetic leakage detection：The defects of by means of the magnetic trace to show ferromagnetic material and its product situation.
At present, magnetic leakage detection machine testing special steel Surface of Rod Bar defect can only judge qualified and unqualified steel, Wu Fatong
Cross magnetic leakage detection collection of illustrative plates and judge defect type, so as to can not promptly and accurately judge defect Producing reason and corrective measure.
The content of the invention
It is an object of the invention to provide a kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind, pass through substantial amounts of leakage field
Flaw detection collection of illustrative plates compares with defect in kind, finds corresponding relation, realizes steel surface defect and quickly confirm that steel rolling process is timely
Rectification, prevent the product defects of more same types.
The technical scheme is that：
A kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind, for crack defect, fold defect or upwarping defect,
Establish the following corresponding relation of flaw echo and defect in kind：
(1) crack defect
Crack defect is linear in steel surface, and opening is acute angle, and length differs；Magnetic leakage detection is column continuous wave
Shape, flaw echo height and width depend on the depth and length of crack defect；
(2) fold defect
Fold defect linearly or zigzag, appear in the part or total length of steel, it is deep mixed, inside have iron scale,
Regular continuously distributed on steel surface, steel surface is locally overlapping, there is obvious folding pattern；Magnetic leakage detection waveform is continuous
Comb shape waveform, compared with crack defect waveform, fold defect ripple is characterized in that defect waves low level is discontinuous or semicontinuous；
(3) upwarping defect
The flaw echo length of upwarping defect is shorter compared with folding flaw echo, and by the comparison that steel are in kind, upwarping defect need not
Polishing, directly found in steel surface.
Advantages of the present invention and beneficial effect are：
1st, the present invention is directed to common rolled surface defect, establishes defect flaw echo and corresponding relation in kind.
2nd, use the present invention to provide strong technical support for quick defect cause of searching, prevent a greater amount of matter
Defect is measured, reduces enterprise's production cost, improves product quality in kind.
Brief description of the drawings
Fig. 1 carries out the line of magnetic induction of magnetic leakage detection detection using the present invention.(a) it is the flawless line of magnetic induction；(b) it is to have
The line of magnetic induction of defect.
Fig. 2 is bar crackle figure.
Fig. 3 is bar fold defect figure.
Fig. 4 is bar upwarping defect figure.
Embodiment
As shown in figure 1, when magnetizing tested ferromagnetic material with magnetizer, if the material of material is continuous, uniform, material
The line of magnetic induction is parallel to material surface in the material by restrained for the line of magnetic induction in material, almost without the line of magnetic induction from
Surface passes, and examined workpiece surface does not have magnetic field.But when in material there is during the defects of cutting magnetic line, material surface
The defects of or structural state change magnetic conductivity can be made to change, due to the magnetic conductivity very little of defect, magnetic resistance is very big, makes in magnetic circuit
Magnetic flux be distorted, the line of magnetic induction flow direction can change, except part magnetic flux directly by defect or passes through material internal
To bypass outside defect, also the magnetic flux of part can leak into material surface overhead, be reentered once again around defect by air
Material, so as to form stray field at System of Detecting Surface Defects For Material.
Stray field is detected using detecting element to find that the electromagnetism of defect examines side method, i.e. magnetic leakage detection.When positioned at bar
Surface and the detecting element pickup stray field performed relative motion with bar, can by probe when converting thereof into defect electric signal
The signal for reflecting defect is obtained, so as to carry out determination processing to defect.According to the Cleaning Principle of magnetic flux leakage testing device, steel are carried out
Surface testing, whether qualified, can not promptly and accurately reflect steel defect Producing reason and apply arranging if can only distinguish steel
Rectification, the directiveness that emphasis is monitored to subsequent production be not strong.
In specific implementation process, method that magnetic leakage detection collection of illustrative plates of the present invention compares with defect in kind, by not increasing
In the case of the input of cost, by summarizing execute-in-place experience, flaw echo and defect corresponding relation in kind are established, is avoided out
Handled merely after existing defect, favourable conditions are provided for the quick root that searches problem.
The surface defect that magnetic leakage detection equipment occurs mainly for steel surface is detected a flaw, flaw echo display picture point three
Point, Part I is bottom ripple, is considered as qualified ripple, continuous wave occurs more than bottom ripple and be considered as not conforming to lattice wave.Just detect a flaw at present
Steel, mainly have after comparing analysis by substantial amounts of waveform in actual production and defect in kind, the defects of discovery following several：
(1) crack defect (Fig. 2)
Crackle is typically linear in steel surface, and its direction is how consistent with rolling direction, but also has other directions, typically
Opening is acute angle, and length differs.Magnetic leakage detection is column continuous wave, and flaw echo height and width depend on the depth of crack defect
Degree and length.
(2) fold defect (Fig. 3)
There is the defects of certain inclination angle, approximate crackle to claim to fold with steel surface along rolling direction, general linear or saw
Dentation, the part or total length of steel are appeared in, it is deep mixed, inside there is iron scale, it is regular continuously distributed on steel surface.
Steel surface is locally overlapping, there is obvious folding pattern.Magnetic leakage detection waveform is approximate continuous comb shape waveform, with crack defect waveform
Compare, fold defect ripple is characterized in that defect waves low level is discontinuous or semicontinuous.
(3) upwarping defect (Fig. 4)
In the operation of rolling, steel are contacted with equipment such as guide and guard, roller-ways and scratched, and draw part steel surface, then
Steel body is pressed into again by rolling, produces this upwarping defect.It is close with folding flaw echo to stick up the leakage field flaw echo of skin, flaw echo length with
Flaw echo is folded compared to shorter, by the comparison that steel are in kind, upwarping defect can directly find in steel surface, use without polishing
Hand can be uncovered.
Claims (1)
1. a kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind, it is characterised in that for crack defect, fold defect or
Upwarping defect, establish the following corresponding relation of flaw echo and defect in kind：
(1) crack defect
Crack defect is linear in steel surface, and opening is acute angle, and length differs；Magnetic leakage detection is column continuous wave,
Flaw echo height and width depend on the depth and length of crack defect；
(2) fold defect
Fold defect linearly or zigzag, appear in the part or total length of steel, it is deep mixed, inside have iron scale, there is rule
Restrain continuously distributed on steel surface, steel surface is locally overlapping, there is obvious folding pattern；Magnetic leakage detection waveform is continuous comb shape
Waveform, compared with crack defect waveform, fold defect ripple is characterized in that defect waves low level is discontinuous or semicontinuous；
(3) upwarping defect
The flaw echo length of upwarping defect is shorter compared with folding flaw echo, and by the comparison that steel are in kind, upwarping defect need not polish,
Directly found in steel surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610615194.5A CN107664661A (en) | 2016-07-29 | 2016-07-29 | A kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201610615194.5A CN107664661A (en) | 2016-07-29 | 2016-07-29 | A kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind |
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| CN107664661A true CN107664661A (en) | 2018-02-06 |
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| CN201610615194.5A Pending CN107664661A (en) | 2016-07-29 | 2016-07-29 | A kind of method that magnetic leakage detection collection of illustrative plates compares with defect in kind |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663433A (en) * | 2018-06-14 | 2018-10-16 | 本钢板材股份有限公司 | A kind of magnetic leakage detection probe channel damage testing tool and detection method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01248050A (en) * | 1988-03-29 | 1989-10-03 | Sumitomo Electric Ind Ltd | Leakage flux flaw detector |
| US5008620A (en) * | 1989-03-10 | 1991-04-16 | Agency Of Industrial Science And Technology | Leakage flux flaw detection method and apparatus utilizing a layered detector |
| CN101968463A (en) * | 2009-07-27 | 2011-02-09 | 中国石油天然气股份有限公司 | Method for identifying pipeline spiral weld crack defect through triaxial magnetic leakage internal detection line signal |
| US20110068782A1 (en) * | 2007-12-21 | 2011-03-24 | Kinder Morgan, Inc. | Computer-implemented method to screen for longitudinal-seam anomalies |
| CN104458898A (en) * | 2014-11-28 | 2015-03-25 | 本钢板材股份有限公司 | Treatment method of high-speed steel roller surface cracks |
| CN104515777A (en) * | 2015-01-14 | 2015-04-15 | 兖州煤业股份有限公司 | Online nondestructive flaw detection system and method for steel wire rope by strong magnetism-image combined technology |
-
2016
- 2016-07-29 CN CN201610615194.5A patent/CN107664661A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01248050A (en) * | 1988-03-29 | 1989-10-03 | Sumitomo Electric Ind Ltd | Leakage flux flaw detector |
| US5008620A (en) * | 1989-03-10 | 1991-04-16 | Agency Of Industrial Science And Technology | Leakage flux flaw detection method and apparatus utilizing a layered detector |
| US20110068782A1 (en) * | 2007-12-21 | 2011-03-24 | Kinder Morgan, Inc. | Computer-implemented method to screen for longitudinal-seam anomalies |
| CN101968463A (en) * | 2009-07-27 | 2011-02-09 | 中国石油天然气股份有限公司 | Method for identifying pipeline spiral weld crack defect through triaxial magnetic leakage internal detection line signal |
| CN104458898A (en) * | 2014-11-28 | 2015-03-25 | 本钢板材股份有限公司 | Treatment method of high-speed steel roller surface cracks |
| CN104515777A (en) * | 2015-01-14 | 2015-04-15 | 兖州煤业股份有限公司 | Online nondestructive flaw detection system and method for steel wire rope by strong magnetism-image combined technology |
Non-Patent Citations (1)
| Title |
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| 梁启华 等: "汽车齿轮用钢SAE8620H表面裂纹产生原因及控制措施", 《第九届中国钢铁年会论文集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663433A (en) * | 2018-06-14 | 2018-10-16 | 本钢板材股份有限公司 | A kind of magnetic leakage detection probe channel damage testing tool and detection method |
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Application publication date: 20180206 |