CN109298067A - A kind of lossless detection method for reducing cast steel part defect processing and appearing - Google Patents
A kind of lossless detection method for reducing cast steel part defect processing and appearing Download PDFInfo
- Publication number
- CN109298067A CN109298067A CN201810249268.7A CN201810249268A CN109298067A CN 109298067 A CN109298067 A CN 109298067A CN 201810249268 A CN201810249268 A CN 201810249268A CN 109298067 A CN109298067 A CN 109298067A
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- China
- Prior art keywords
- detection
- rough casting
- detection method
- thickness
- lossless
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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
- G01N27/84—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 by applying magnetic powder or magnetic ink
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Abstract
The present invention provides a kind of reduction cast steel part defects to process the lossless detection method appeared, which is characterized in that step 1: linear discontinuities of the rough casting thickness in N≤8mm use fluorescence wet process Magnetic testing；Step 2: linear discontinuities detection of the rough casting in thickness N > 8mm uses ultrasound detection；Step 3: the volume flaw detection of rough casting uses ultrasound detection.It can effectively find that the spray stage, there are the volume defects that property is the types such as shrinkage cavity and porosity, stomata, slag inclusion and in time to remove.
Description
Technical field
The present invention relates to a kind of lossless detection methods, more particularly to the lossless detection method of cast steel part defect processing.
Background technique
In recent years, with the continuous development of power station equipment technology, client constantly improves the quality requirement of casting.Although
NDT (Non-destructive Testlng non-destructive testing) can be efficiently controlled product quality by standard at present, but due to portion
Divide casting technique control difficulty big, the casting flaw for causing cast-internal to generate is relatively more, and NDT cannot be removed inside rough casting
All gross imperfections.For meeting NDT standard and gross imperfection in rough casting is in product finishing or secondary operation
When exposure very big influence is caused to the quality of engineering, while needing to expend a large amount of human and material resources and going to study for a second time courses one has flunked solution.How to solve
Certainly problems shorten the duty cycle, Improving The Quality of Products, and the NCR (Non-Compliance report) for reducing client is worth research.
Since casting is a kind of metal heat processing technique, liquid is referred to will be in room temperature for liquid but shortly after by cured object
The mold that matter pours into specific shape waits for its solidification forming, the method for obtaining part or blank.It can be made into shape with the method for casting
The defects of complicated blank, but since cast sturcture is coarse, there are cast member shrinkage cavity and porosity, stomata, slag inclusion, crackle, leakages.
When rough casting carry out next procedure roughing or finishing when, be hidden in the gross imperfection for meeting NDT standard inside blank
It is exposed, will seriously affect corporate image, or even cause scrap of the product, certain economic loss is brought to enterprise.
The measure that reduction cast steel part defect processing is appeared from pouring technology in addition to improving, next handle from nondestructive testing
It closes.The present invention processes the detection method of exposure defect, and the production to preventing from processing defect of appearing from second aspect analysis blank
Raw and raising casting quality, proposes corresponding measure.
Summary of the invention
The present invention analyze blank process exposure defect detection method, and to prevent processing appear defect generation and mention
High casting quality proposes corresponding measure.
The present invention provides a kind of reduction cast steel part defects to process the lossless detection method appeared thus, it is characterised in that:
Step 1: linear discontinuities of the rough casting thickness in N≤8mm use fluorescence wet process Magnetic testing；
Step 2: linear discontinuities detection of the rough casting in thickness N > gmm uses ultrasound detection；
Step 3: the volume flaw detection of rough casting uses ultrasound detection.
Preferably, ultrasound detection is lacked using the volume type that rough casting thickness N > 48mm is effectively detected in straight probe of single crystal
It falls into；Using the linear discontinuities of monocrystalline angle probe detection rough casting thickness N > gmm.
Preferably, ultrasound detection uses double-crystal normal probe that rough casting thickness N is effectively detected as (5mm, 55mm) depth
Volume flaw.
Preferably, ultrasound detection can be effectively detected in detection rough casting thickness N≤50mm using potable crystal probe
Linear discontinuities and stomata.
It is far from being enough that the defect that near surface is contained only with fluorescence wet process magnetic powder, which is appeared, because Magnetic testing has
Its limitation.Although the discontinuous width that the sensitivity of Magnetic testing can detect can reach 0.1 μm of bar defect, for body
Shrinkage cavity and porosity, the stomata etc. of product type are difficult detected, while any defect buried depth has been more than that 8mm Magnetic testing is also difficult
Display.So Magnetic testing only covers in blank near surface 8mm in the detection for the gross imperfection that control meets NDT standard
Region, and only mainly for the detection of linear discontinuities.If the machining allowance of blank has been more than 8mm or to have detected 8mm
Interior volume flaw must be replaced using ultrasound examination, but the workload of ultrasound examination is bigger than Magnetic testing.
Detailed description of the invention
Fig. 1 lossless detection method flow chart
Fig. 2 volume flaw lossless detection method schematic diagram
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
Embodiment
Magnetizing current cooperates the dry magnetic particle of relatively thick (80-260 mesh) that can preferably detect under surface using three phase full wave rectification
The linear discontinuities of 10mm, and farthest discovery (buried depth 2 arrives 4mm) spherical small defect in hole.Three phase full wave rectification electromagnetic field intensity
Degree penetration is strong, and defect magnetic flux leakage field is big, can be in the detection adsorption magnetic powder of different gradients.But be powered duration compared with
Long, otherwise magnetic powder is easy to fall off；Since workpiece surface needs drying, high operation requirements, observation need to carefully make detection time relatively
It is long.Comprehensive analysis: regardless of magnetizing current is halfwave rectifier either three phase full wave rectification, using fluorescence wet process magnetic powder test workpiece
The available preferable testing result of near surface and detection efficiency height.
Casting is all often coarse grains, uneven and tissue is unsound, thus when casting ultrasonic detects, often
It is commonly present the problems such as sound transparency is poor, acoustical coupling difference and interference noise is more, brings puzzlement to the detection of casting.So according to hair
The different machining allowance of blank select it is different probe be very it is necessary to.
As shown in Figure 2,In practical applications, blind area existing for straight probe of single crystal B2S is in 10mm or so, within this range
The back wave of defect is obscured with beginning wave, it is not easy to judge defect.But near field region N (about 48mm) can be effectively detected in straight probe of single crystal
Defect in addition.Using the linear discontinuities of monocrystalline angle probe detection rough casting thickness N > 48mm.Double-crystal normal probe SEB2 by
The defect of 5mm to 55mm depth is inside effectively detected in 2-3mm or so in surface coupling influence blind area.Potable crystal probe can be effective
Ground detect the defects of near surface 50mm and and stomata, blind area is very small, almost can detecte and shows defect of appearing.
Claims (4)
1. a kind of cast steel part defect that reduces processes the lossless detection method appeared, which is characterized in that
Step 1: linear discontinuities of the rough casting thickness in N≤8mm use fluorescence wet process Magnetic testing；
Step 2: linear discontinuities detection of the rough casting in thickness N > 8mm uses ultrasound detection；
Step 3: the volume flaw detection of rough casting uses ultrasound detection.
2. lossless detection method as described in claim 1, which is characterized in that the ultrasound detection is had using straight probe of single crystal
The volume flaw of effect ground detection rough casting thickness N > 48mm；Rough casting thickness N > 8mm is detected using monocrystalline angle probe
Linear discontinuities.
3. lossless detection method as described in claim 1, which is characterized in that the ultrasound detection is had using double-crystal normal probe
Detection rough casting thickness N in effect ground is the volume flaw of (5mm, 55mm) depth.
4. lossless detection method as described in claim 1, which is characterized in that the ultrasound detection uses potable crystal probe energy
Linear discontinuities and stomata in detection rough casting thickness N≤50mm are effectively detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249268.7A CN109298067A (en) | 2018-03-23 | 2018-03-23 | A kind of lossless detection method for reducing cast steel part defect processing and appearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249268.7A CN109298067A (en) | 2018-03-23 | 2018-03-23 | A kind of lossless detection method for reducing cast steel part defect processing and appearing |
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| Publication Number | Publication Date |
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| CN109298067A true CN109298067A (en) | 2019-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810249268.7A Pending CN109298067A (en) | 2018-03-23 | 2018-03-23 | A kind of lossless detection method for reducing cast steel part defect processing and appearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505234A (en) * | 2020-06-11 | 2020-08-07 | 江苏汉诺威铸业有限公司 | Blank inspection method for steel casting |
Citations (5)
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| JP2008209148A (en) * | 2007-02-23 | 2008-09-11 | Kobe Steel Ltd | Non-destructive inspection method and device |
| CN103134853A (en) * | 2011-12-02 | 2013-06-05 | 天津市三焱电渣钢有限公司 | Nondestructive detection method for crankshaft |
| CN104034797A (en) * | 2014-06-30 | 2014-09-10 | 成都高普石油工程技术有限公司 | Technology for lossless drilling rod detection |
| CN105628787A (en) * | 2015-12-30 | 2016-06-01 | 瓦房店轴承集团有限责任公司 | Nondestructive detection method for wind power yawing and pitch-variable bearing |
| CN106770650A (en) * | 2016-11-26 | 2017-05-31 | 共享铸钢有限公司 | The non-destructive method of the pipe with small pipe diameter Thin-Section Steel Castings mouth of pipe |
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2018
- 2018-03-23 CN CN201810249268.7A patent/CN109298067A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| JP2008209148A (en) * | 2007-02-23 | 2008-09-11 | Kobe Steel Ltd | Non-destructive inspection method and device |
| CN103134853A (en) * | 2011-12-02 | 2013-06-05 | 天津市三焱电渣钢有限公司 | Nondestructive detection method for crankshaft |
| CN104034797A (en) * | 2014-06-30 | 2014-09-10 | 成都高普石油工程技术有限公司 | Technology for lossless drilling rod detection |
| CN105628787A (en) * | 2015-12-30 | 2016-06-01 | 瓦房店轴承集团有限责任公司 | Nondestructive detection method for wind power yawing and pitch-variable bearing |
| CN106770650A (en) * | 2016-11-26 | 2017-05-31 | 共享铸钢有限公司 | The non-destructive method of the pipe with small pipe diameter Thin-Section Steel Castings mouth of pipe |
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| 张晶: "铸钢件超声检测标准的比较", 《大型铸锻件》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505234A (en) * | 2020-06-11 | 2020-08-07 | 江苏汉诺威铸业有限公司 | Blank inspection method for steel casting |
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Application publication date: 20190201 |