CN105987890B - Particle content evaluation method - Google Patents
Particle content evaluation method Download PDFInfo
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- CN105987890B CN105987890B CN201510080220.4A CN201510080220A CN105987890B CN 105987890 B CN105987890 B CN 105987890B CN 201510080220 A CN201510080220 A CN 201510080220A CN 105987890 B CN105987890 B CN 105987890B
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Abstract
The present invention provides a kind of Particle content evaluation methods, for the magnetic powder inspection process to round steel comprising record the initial concentration ρ that the flaw detection process carries out foregoing description magnetic flaw detection ink0, calculate the concentration ρ that the magnetic flaw detection ink is consumedc, with the initial concentration ρ of the magnetic flaw detection ink0Subtract the concentration ρ that the magnetic flaw detection ink is consumedcObtain the Particle content ρ, i.e. ρ=ρ0‑ρc.This method calculates magnetic powder consumption by calculating surface area and the defect fluorescence intensity of round steel, estimates Particle content, in the case where steady and continuous production, estimation result precision with higher.
Description
Technical field
The present invention relates to a kind of Particle content evaluation methods.
Background technique
The concentration of magnetic flaw detection ink is an important factor for influencing wet process magnetic powder inspection effect in the automatic magnetic powder inspection of round steel.It is detecting a flaw
In the process, the magnetic powder of round steel surface attachment can enter later process with round steel, cause Particle content that can constantly reduce, until
Influence the identification of defect.
Traditional Particle content measurement method is the pyriform precipitating tube method using measurement magnetic powder volume.This method, which exists, to be surveyed
The disadvantages of measuring time length, cannot timely feedbacking, simultaneously as the dirt (such as sandy soil and oxide) on part is brought into magnetcisuspension
In liquid, keep measurement result inaccurate.
Also occur some new Particle content detection methods and device now.As patent CN 103063554 is provided
A kind of Particle content fast qualitative measuring method based on light transmittance changes its light transmittance also therewith with concentration using magnetic flaw detection ink
Changed rule, to detect Particle content.But this method is unable to Accurate Determining concentration value, can only provide qualitative knot
By.
For another example patent CN 1712949A provides a kind of magnetic powder concentration sensor of magnetic suspension, utilizes simple electromagnetic induction
Caused curent change measures Particle content.But current signal changes small, interference signal greatly in actual field, so that
The sensitivity of the device is lower.
It is an object of the present invention to propose a kind of evaluation method of simple suspension concentration, and it can guarantee to calculate
Precision.
Summary of the invention
For this purpose, the present invention provides a kind of Particle content evaluation method, for the magnetic powder inspection process to round steel, including
Record the initial concentration ρ that the flaw detection process carries out foregoing description magnetic flaw detection ink0, calculate the concentration ρ that the magnetic flaw detection ink is consumedc, use
The initial concentration ρ of the magnetic flaw detection ink0Subtract the concentration ρ that the magnetic flaw detection ink is consumedcObtain the Particle content ρ, i.e. ρ=ρ0-
ρc, wherein calculate the concentration ρ that the magnetic flaw detection ink is consumedcInclude the following steps: S1. according to the table for the round steel currently detected a flaw
The concentration of magnetic flaw detection ink described in areal calculation being currently consumed, as the first current consumption concentration ρ1′；S2. described first is worked as
Preceding consumption concentration ρ1' and the first history consumption concentration ρ1" adduction, obtains the first consumption concentration ρ1, i.e. ρ1=ρ1′+ρ1", wherein institute
State the first history consumption concentration ρ1" the concentration ρ that the magnetic flaw detection ink being calculated when previous round steel is detected a flaw for it is consumedc；
S3. by the first consumption concentration ρ1The concentration ρ being consumed as the magnetic flaw detection inkc。
In order to improve estimation precision, the present invention also provides a kind of Particle content evaluation methods, for the magnetic to round steel
Powder flaw detection process, the initial concentration ρ of foregoing description magnetic flaw detection ink is carried out including recording the flaw detection process0, calculate the magnetic flaw detection ink
The concentration ρ being consumedc, with the initial concentration ρ of the magnetic flaw detection ink0Subtract the concentration ρ that the magnetic flaw detection ink is consumedcObtain the magnetic
Suspension concentration ρ, i.e. ρ=ρ0-ρc, wherein calculate the concentration ρ that the magnetic flaw detection ink is consumedcInclude the following steps: S1 ' according to working as
The surface area of the preceding round steel detected a flaw calculates the concentration of the magnetic flaw detection ink being currently consumed, as the first current consumption concentration
ρ1′；S2 ' currently consumes concentration ρ for described first1' and the first history consumption concentration ρ1" adduction, obtains the first consumption concentration ρ1,
That is ρ1=ρ1′+ρ1", wherein first history consumes concentration ρ1" the magnetic being calculated when previous round steel is detected a flaw for it
The concentration ρ that suspension is consumedc；The round steel that S3 ' is currently detecting a flaw described in ultraviolet source irradiation, should with industrial camera acquisition
The defect fluorescent image of round steel calculates the mean fluorecence brightness of the defect fluorescent image, as current defect fluorescent brightness V '；
S4 ' sums it up the current defect fluorescent brightness V ' and historic defects fluorescent brightness V ", obtains defect fluorescent brightness V, wherein
The defect fluorescent brightness V that the historic defects fluorescent brightness V " is calculated when previous round steel is detected a flaw for it；S5 ' is logical
The concentration being consumed that the defect fluorescent brightness V calculates the magnetic flaw detection ink is crossed, as the second consumption concentration ρ2；S6 ' will be described
First consumption concentration ρ1With the second consumption concentration ρ2Adduction, obtains the concentration ρ that the magnetic flaw detection ink is consumedc。
Further, the described first current consumption concentration ρ1' calculate according to the following formula: ρ1'=a π DL, wherein a is face
Product-magnetic powder consumption coefficient, D and L are respectively the diameter and length for the round steel currently detected a flaw.The current defect fluorescent brightness
V ' is calculated according to the following formula:Wherein, C is the number of the pixel of the defect fluorescent image, ViIt is lacked to be described
Fall into the brightness of each pixel of fluorescent image.It is described to add the current defect fluorescent brightness V ' and historic defects fluorescent brightness V "
It is summed it up with for weighting, i.e. V=α V "+(1- α) V ', wherein α is the first weighting coefficient, and value 0-1, preferred value is 0.1 or so.
The second consumption concentration ρ2It calculates according to the following formula: ρ2=b (V0- V), wherein b is fluorescence-magnetic powder consumption coefficient, V0For
Initial fluorescence brightness.It is described to consume concentration ρ for described first1With the second consumption concentration ρ2Adduction is weighting adduction, i.e. ρc=
βρ1+(1-β)ρ2, wherein β is the second weighting coefficient, and value 0-1, preferred value is to change in round steel specification little greater than 0.5
In the case where preferred value be 0.9.
The present invention utilizes the industrial camera of the automatic magnetic powder inspection of round steel, proposes a kind of simple and easy to do, not optional equipment magnetic
Suspension Concentration Estimation Method.This method calculates magnetic powder consumption, estimation by calculating surface area and the defect fluorescence intensity of round steel
Particle content.It is in the case where steady and continuous produces, estimation result precision with higher.
Detailed description of the invention
Fig. 1 is the application schematic diagram of Particle content evaluation method of the invention.
Description of symbols:
1: ultraviolet source 2: round steel 3: industrial camera
Specific embodiment
Particle content evaluation method of the invention is made with reference to the accompanying drawings and detailed description further detailed
Description, but it is not as a limitation of the invention.
As shown in Figure 1, being the application schematic diagram of Particle content evaluation method of the invention.Ultraviolet source 1 is irradiated into quilt
The round steel 2 of flaw detection, industrial camera 3 acquire the image of defect area, by the surface area and defect area that calculate the round steel detected a flaw
The fluorescence intensity in domain consumes to calculate magnetic powder, to estimate the concentration of magnetic flaw detection ink.
Particle content evaluation method preferred embodiment of the invention is described below.
Step S1 or S1 ': reading the diameter D and length L of round steel currently to detect a flaw, and calculates the according to the following formula
One current consumption concentration ρ1':
ρ1'=a π DL, wherein a is area-magnetic powder consumption coefficient.
Area-magnetic powder consumption coefficient a is calibration value, and specification (diameter and length) unified a certain number of circles can be used
Steel is demarcated.After a certain number of round steel pass through fault detection system, according to the formula reference area-magnetic powder consumption coefficient a:Wherein, N is the quantity of the round steel of calibration, DBFor the diameter of the round steel of calibration, LBFor the length of the round steel of calibration
Degree, ρB0For the Particle content before calibration flaw detection, ρB1For the Particle content after calibration flaw detection.
Step S2 or S2 ': by the first current consumption concentration ρ1' and the first history consumption concentration ρ1" adduction, obtains first and disappears
Consume concentration ρ1, i.e. ρ1=ρ1′+ρ1″.Wherein, the first history consumes concentration ρ1" the magnetic being calculated when previous round steel is detected a flaw for it
The concentration ρ that suspension is consumedc。
The first consumption concentration ρ being calculated at this time1It can be used as the concentration ρ that magnetic flaw detection ink is consumedcFinally to estimate magnetcisuspension
The concentration of liquid, but the error of the result estimated in this way is larger, therefore, it is also desirable to which following steps improve the precision of estimation.
Step S3 ': the round steel currently detected a flaw with ultraviolet source irradiation, the defect for acquiring the round steel with industrial camera are glimmering
Light image calculates the mean fluorecence brightness of the defect fluorescent image, i.e. current defect fluorescent brightness V ' according to the following formula:
Wherein, C is the number of the pixel of defect fluorescent image, ViFor each picture of defect fluorescent image
The brightness of element.
Wherein, defect fluorescent image is to show abnormal fluorescence because magnetic powder is had accumulated by the surface defect of flaw detection round steel
The image of brightness.
Step S4 ': current defect fluorescent brightness V ' and historic defects fluorescent brightness V " weighting is summed it up, i.e., according to following public
Formula obtains defect fluorescent brightness V, wherein the defect that historic defects fluorescent brightness V " is calculated when previous round steel is detected a flaw for it
Fluorescent brightness V:
V=α V "+(1- α) V ', wherein α is the first weighting coefficient, value 0-1.Since fluorescent brightness is vulnerable to interference,
It is preferred that the value of the first weighting coefficient α should not be too large, general value is advisable for 0.1 or so.
Step S5 ': according to the following formula, the second consumption concentration ρ is calculated by defect fluorescent brightness V2:
ρ2=b (V0- V), wherein b is fluorescence-magnetic powder consumption coefficient, is calibration value, V0For initial fluorescence brightness.
Fluorescence-magnetic powder consumption coefficient b and initial fluorescence brightness V0Automatic crack detection system depending on actual use.It is replacing
After magnetic flaw detection ink, in initial concentration ρG0Under, fault detection system can obtain the mean fluorecence brightness of best defect fluorescent image, as
Initial fluorescence brightness V0.When magnetic flaw detection ink needs replacing, i.e. the least concentration ρ of the magnetic flaw detection ink of operating condition permissionG1Under, flaw detection system
The mean fluorecence brightness of getable minimum acceptable defect fluorescent image of uniting is denoted as VL, then can be according to formulaTo obtain fluorescence-magnetic powder consumption coefficient b.
Step S6 ': according to the following formula, concentration ρ is consumed by first1With the second consumption concentration ρ2Weighting adduction, obtains magnetcisuspension
The concentration ρ that liquid is consumedc:
ρc=β ρ1+(1-β)ρ2, wherein β is the second weighting coefficient, value 0-1.Due to being calculated by round steel surface area
Magnetic powder consumption is more stable, and magnetic powder consumption is calculated by fluorescent brightness more vulnerable to interference, it is therefore preferred that second adds
The value of weight coefficient β is greater than 0.5.Change little applicable cases for round steel specification, the value of β can be bigger than normal, such as takes
0.9。
With the initial concentration ρ of magnetic flaw detection ink0Subtract the concentration ρ that magnetic flaw detection ink is consumedc, the Particle content ρ estimated,
That is ρ=ρ0-ρc, wherein ρ0To record the initial concentration of magnetic flaw detection ink before flaw detection process carries out.
The above specific embodiment is only exemplary embodiments of the present invention, it is impossible to be used in limits the present invention, the present invention
Protection scope be defined by the claims.Those skilled in the art can within the spirit and scope of the present invention, to this
Various modifications or equivalent replacements are made in invention, these modifications or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (9)
1. a kind of Particle content evaluation method, for the magnetic powder inspection process to round steel, which is characterized in that including described in record
The initial concentration ρ of flaw detection process progress foregoing description magnetic flaw detection ink0, calculate the concentration ρ that the magnetic flaw detection ink is consumedc, with the magnetcisuspension
The initial concentration ρ of liquid0Subtract the concentration ρ that the magnetic flaw detection ink is consumedcObtain the Particle content ρ, i.e. ρ=ρ0-ρc, wherein
Calculate the concentration ρ that the magnetic flaw detection ink is consumedcInclude the following steps:
S1. the concentration being currently consumed that the magnetic flaw detection ink is calculated according to the surface area of round steel currently detected a flaw, as the
One current consumption concentration ρ1′；
S2. by the described first current consumption concentration ρ1' and the first history consumption concentration ρ1" adduction, obtains the first consumption concentration ρ1,
That is ρ1=ρ1′+ρ1", wherein first history consumes concentration ρ1" the magnetic being calculated when previous round steel is detected a flaw for it
The concentration ρ that suspension is consumedc；
S3. by the first consumption concentration ρ1The concentration ρ being consumed as the magnetic flaw detection inkc。
2. Particle content evaluation method according to claim 1, which is characterized in that the described first current consumption concentration ρ1′
It calculates according to the following formula:
ρ1'=a π DL, wherein a is area-magnetic powder consumption coefficient, and D and L are respectively the diameter and length for the round steel currently detected a flaw
Degree.
3. a kind of Particle content evaluation method, for the magnetic powder inspection process to round steel, which is characterized in that including described in record
The initial concentration ρ of flaw detection process progress foregoing description magnetic flaw detection ink0, calculate the concentration ρ that the magnetic flaw detection ink is consumedc, with the magnetcisuspension
The initial concentration ρ of liquid0Subtract the concentration ρ that the magnetic flaw detection ink is consumedcObtain the Particle content ρ, i.e. ρ=ρ0-ρc, wherein
Calculate the concentration ρ that the magnetic flaw detection ink is consumedcInclude the following steps:
S1 ' calculates the concentration of the magnetic flaw detection ink being currently consumed according to the surface area of round steel currently detected a flaw, as the
One current consumption concentration ρ1′；
S2 ' currently consumes concentration ρ for described first1' and the first history consumption concentration ρ1" adduction, obtains the first consumption concentration ρ1,
That is ρ1=ρ1′+ρ1", wherein first history consumes concentration ρ1" the magnetic being calculated when previous round steel is detected a flaw for it
The concentration ρ that suspension is consumedc；
The round steel that S3 ' is currently detecting a flaw described in ultraviolet source irradiation, the defect fluorogram of the round steel is acquired with industrial camera
Picture calculates the mean fluorecence brightness of the defect fluorescent image, as current defect fluorescent brightness V '；
S4 ' sums it up the current defect fluorescent brightness V ' and historic defects fluorescent brightness V ", obtains defect fluorescent brightness V,
In, the historic defects fluorescent brightness V " defect fluorescent brightness V for being calculated when previous round steel is detected a flaw for it；
S5 ' calculates the concentration of the magnetic flaw detection ink being consumed by the defect fluorescent brightness V, as the second consumption concentration ρ2；
S6 ' consumes concentration ρ for described first1With the second consumption concentration ρ2Adduction, obtain the magnetic flaw detection ink be consumed it is dense
Spend ρc；
It is described to sum it up the current defect fluorescent brightness V ' and historic defects fluorescent brightness V " adduction for weighting, i.e. V=α V "+
(1- α) V ', wherein α is the first weighting coefficient, value 0-1；
It is described to consume concentration ρ for described first1With the second consumption concentration ρ2Adduction is weighting adduction, i.e. ρc=β ρ1+(1-β)
ρ2, wherein β is the second weighting coefficient, value 0-1.
4. Particle content evaluation method according to claim 3, which is characterized in that the described first current consumption concentration ρ1′
It calculates according to the following formula:
ρ1'=a π DL, wherein a is area-magnetic powder consumption coefficient, and D and L are respectively the diameter and length for the round steel currently detected a flaw
Degree.
5. Particle content evaluation method according to claim 3, which is characterized in that the current defect fluorescent brightness V '
It calculates according to the following formula:
Wherein, C is the number of the pixel of the defect fluorescent image, ViFor each of described defect fluorescent image
The brightness of pixel.
6. Particle content evaluation method according to claim 3, which is characterized in that the second consumption concentration ρ2According to
Following formula calculates:
ρ2=b (V0- V), wherein b is fluorescence-magnetic powder consumption coefficient, V0For initial fluorescence brightness.
7. Particle content evaluation method according to claim 3, which is characterized in that the first weighting coefficient α is
0.1。
8. Particle content evaluation method according to claim 3, which is characterized in that second weighting coefficient β > 0.5.
9. Particle content evaluation method according to claim 8, which is characterized in that the second weighting coefficient β is
0.9。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4879537A (en) * | 1988-07-25 | 1989-11-07 | Rockwell International Corporation | Magnetic suspension and magnetic field concentration using superconductors |
| US6169861B1 (en) * | 1999-10-27 | 2001-01-02 | Xerox Corporation | Feedback toner concentration control for an imaging system |
| CN1712949A (en) * | 2005-07-15 | 2005-12-28 | 曾德文 | Magnetic powder concentration sensor for magnetic suspension |
| CN202886327U (en) * | 2012-08-31 | 2013-04-17 | 爱德森（厦门）电子有限公司 | Device for carrying out online real-time dynamic monitoring on concentration of magnetic suspension |
| CN203455309U (en) * | 2013-06-27 | 2014-02-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | Magnetic suspension concentration measuring device for magnetic powder inspection |
-
2015
- 2015-02-13 CN CN201510080220.4A patent/CN105987890B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4879537A (en) * | 1988-07-25 | 1989-11-07 | Rockwell International Corporation | Magnetic suspension and magnetic field concentration using superconductors |
| US6169861B1 (en) * | 1999-10-27 | 2001-01-02 | Xerox Corporation | Feedback toner concentration control for an imaging system |
| CN1712949A (en) * | 2005-07-15 | 2005-12-28 | 曾德文 | Magnetic powder concentration sensor for magnetic suspension |
| CN202886327U (en) * | 2012-08-31 | 2013-04-17 | 爱德森（厦门）电子有限公司 | Device for carrying out online real-time dynamic monitoring on concentration of magnetic suspension |
| CN203455309U (en) * | 2013-06-27 | 2014-02-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | Magnetic suspension concentration measuring device for magnetic powder inspection |
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