CN1003095B - Method for detecting spheroidization grade in front of furnace - Google Patents
Method for detecting spheroidization grade in front of furnace Download PDFInfo
- Publication number
- CN1003095B CN1003095B CN85100583A CN85100583A CN1003095B CN 1003095 B CN1003095 B CN 1003095B CN 85100583 A CN85100583 A CN 85100583A CN 85100583 A CN85100583 A CN 85100583A CN 1003095 B CN1003095 B CN 1003095B
- Authority
- CN
- China
- Prior art keywords
- core
- graphite
- furnace
- curve
- molten iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 16
- 239000010439 graphite Substances 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 230000005496 eutectics Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 230000008014 freezing Effects 0.000 claims description 5
- 238000007710 freezing Methods 0.000 claims description 5
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 abstract description 3
- 238000007711 solidification Methods 0.000 abstract description 3
- 229910001141 Ductile iron Inorganic materials 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 235000000396 iron Nutrition 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 229910001060 Gray iron Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000002964 excitative effect Effects 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241000920033 Eugenes Species 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 1
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Images
Landscapes
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a method for detecting spheroidization grade in front of a furnace, which can be used for detecting and controlling the front of the furnace for casting and producing ductile irons, wherein sampled molten iron is poured into a secondary annular closed sand core of a transformer type sensor at a certain temperature, the change of resistivity during the ductile iron eutectic solidification period in the secondary sand core is reflected in a primary coil, a measuring circuit displays phase change increment, and the spheroidization grade of graphite can be predicted within one minute after the molten iron is poured into the sand core.
Description
The invention belongs to Foundry Production magnesium iron stokehold fast detecting equipment and method.
The stokehold is detected spheroidization of graphite rank employing metallographic, fracture, heat analysis, is reached the relative thermal conductivity method in the prior art, and said method can not satisfy production requirement aspect detection speed or the accuracy.Si Mite-boolean restrained (Schmid-Burgk in 1936, w) Bi Fuwa Bielski (Piwowarskg, E) studied the electric conductivity of liquid metals with the transformer method, solid-state sample at transformer one arm as secondary coil, the electric conductivity of research liquid metals after the heat fused.High-quality gray iron (Eugen piwowarskg Hochwertiges GuBeisen 1958 5.489～505).1973 Romanian Si Tuofennasiku (D.M Stefanescu) this method is made into, being placed on uncovered loam core becomes a secondary short circuited coil that weight is variable after pouring into molten iron around the fixing vertical yoke beam, at another vertical yoke beam coiling primary coil, horizontal yoke beam can move, cause the variation of electric current during with electric current table record molten steel solidification, can only distinguish magnesium iron and gray iron.Si Tuofennasiku (D.M Stefanescu GieBereipraxis Juni 1973 Nrll).Japan Lai Kou is upright male at the open date 78.11.17 of the clear 53-131917(of JP-) in, adopt and the roughly the same method of D.M.Stefanescu, the molten iron of soon not controlling temperature pours into open mould, electric current with electric current table record primary coil changes, its difference only is change in resistance and thermal analysis curve are combined, analyze change in resistance curve during cooling curve is determined eutectic freezing by heat, measure the spheroidization of graphite rank.But this method can't make each time measurement that identical background condition is arranged, and also can't disclose the complicacy of non-globular graphite forming process, therefore can not satisfy quick, accurate and the thin production requirement of nodularization classification.The method that adopts resistivity method to combine with heat analysis bothers and does not have a practical value.At above-mentioned weak point, the present invention proposes a kind of stokehold and detects other Apparatus and method for of spheroidization of graphite level.
The objective of the invention is to adopt a kind of stokehold to detect the equipment and the method for nodulizing grade, the variation by resistivity during the measurement sampling molten iron eutectic freezing reaches the purpose that stokehold fast detecting spheroidization of graphite rank is carried out the control of magnesium iron stokehold.
Equipment of the present invention is made up of transformer type sensor and metering circuit, transformer type sensor is made up of secured core that is wound with primary coil and movable core, the latter places a quantitatively ring-shaped closed core of molten iron, when getting core, dress removes movable core, but the time must fit movable core and secured core in test, it is 1 short circuit secondary coil (ring specimen) that ring-shaped closed core waters the formation number of turn behind the full sampling molten iron.Primary coil comprises primary winding, compensating coil and electric capacity, to cancel excitatory idle component, the power source special of metering circuit inside is to the primary coil supply power, when elementary coil working voltage constant, when transformer sensor is operated in the BH curve linear segment, the variation that causes resistivity during the molten steel solidification in the secondary ring specimen of sensor can be measured by the sensor primary coil, and the change records with ring specimen resistivity in registering instrument or computing machine becomes the variation of voltage to be called the I(electric current)-τ (time) curve.
Metering circuit provides ac working power supply to sensor, and the electric current in the elementary winding of sensor is measured, and it is converted to direct current signal and only takes out phase transformation increment input registering instrument or computing machine, is depicted as I-τ curve.
It is that sampling molten iron a certain temperature between 1170 ℃～1230 ℃ is poured in the core of the said equipment that other method of spheroidization of graphite level is detected in the stokehold, the variable quantity of resistivity during the automatic measurement magnesium iron eutectic freezing, identical background is arranged when detecting under these conditions, caught spherical, during a large amount of eutectic freezings that form of non-globular graphite, because the decline ring specimen resistivity with nodulizing grade increases, therefore study the collection of illustrative plates that can obtain I-τ curve and nodulizing grade by experiment, deposit this collection of illustrative plates in computing machine, can be used for detecting the spheroidization of graphite rank according to the position of the curve that is detected in collection of illustrative plates, the carbonide that under normal production conditions, generates and solidify the shrinkage porosity defect of contraction cavity that forms latter stage and do not influence testing result.
Advantage of the present invention and effect be, can be in stokehold fast detecting spheroidization of graphite rank, and accuracy is greater than 90%, and the core cost is low, and Apparatus and method for is easy, grasps easily.
Fig. 1 is the transformer type sensor structural representation.
Fig. 2 is ring-shaped closed core synoptic diagram.
Fig. 3 is the metering circuit block scheme.
Fig. 4 is a nodularization classification collection of illustrative plates.
Be the specific descriptions of one embodiment of the present of invention below.
There is one to form in the transformer type sensor as shown in Figure 1 by annular core (1), movable core (2) and primary coil (3), ring-shaped closed core (1) is the core that covers of quantitative molten iron, form closed short circuit secondary coil after watering full sampling molten iron, primary coil (3) comprises primary winding, compensating coil and electric capacity, to cancel excitatory idle component, when device or taking-up core, movable core (2) can be removed, and movable core during test (2) becomes constant tightening state with secured core (4).
The ring-shaped closed core (1) used of pouring molten iron is by core (6), upper cover plate core (5) and cast gate (7) are formed down as shown in Figure 2.
Metering circuit as shown in Figure 3 is by stabilized voltage supply, D.C. regulated power supply.Frequency-selecting amplifier, rectification circuit and direct current signal processing etc. are partly formed, and metering circuit is only taken out the phase transformation increment input registering instrument of change in resistance in the process of setting.
Be illustrated in figure 4 as the spheroidization of graphite classification collection of illustrative plates that under certain working condition, obtains, in intermediate frequency furnace cupola furnace, main frequency furnace melting, base iron sulfur content greater than 0.13%, rare earth magnesium is a modulizer, normally breed, floating silicon breed and the instant inoculation condition under several production scenes actual measurement more than 200 times, accuracy rate is greater than 90%.Horizontal ordinate is time τ (second) in Fig. 4.Ordinate is electric current I (mA).When detecting, must adopt the same enlargement factor of Fig. 4 nodularization classification collection of illustrative plates, between curve 1-2, be among Fig. 4 nodularization 1-2 level between curve 2-3, to be nodularization 2-3 level, between curve 3-4 level, be nodularization 3-4 level.Be positioned at and be 4～5～6 grades of nodularizations under the curve 4.The curve 6,7 that dI/d τ＜0 appears in curve is a gray iron all, be positioned at curve that curve 2～3～4 crosses after 30 seconds dI/d τ value and curve 5 similar curves all be 4～5～6 grades.This class curve location is lower, and non-globular graphite quantity is many more, comprises between a dividing regions that two nodulizing grades are because number of graphite ball also influences I-τ curve, for ductile iron production, should be controlled at 1～2 grade in the stokehold usually, requires to hang down a bit to can be controlled in 2～3 grades.When device parameter is constant, change greatly as working condition, the collection of illustrative plates basic law of Fig. 4 is constant, but grading range slightly changes, and molten iron can be quoted nodulizing grade by 60 seconds in 30 seconds as shown in Figure 4 after set point of temperature pours into the annular core.
Operating procedure is as follows, after the apparatus core of stokehold detection nodulizing grade is in running order, after the molten iron of will taking a sample is handled through corresponding working condition, a certain temperature pours into the core checkout equipment and can draw detection curve automatically in 1170 ℃～1230 ℃ scopes, contrast the information that can obtain the nodularization classification with the collection of illustrative plates of Fig. 4, if deposit nodularization classification collection of illustrative plates in microprocessor, the indication pouring temperature, when detecting, computer printer is drawn classification collection of illustrative plates and detection curve simultaneously, print the result, can be spheroidization of graphite stokehold fast detecting so even more ideal equipment is provided.
Claims (1)
1, a kind of other method of stokehold fast detecting spheroidization of graphite level, it is characterized in that sampling molten iron a certain temperature between 1170 ℃-1230 ℃ is poured into the core of lid, automatically the change in resistance increment during the detection magnesium iron eutectic freezing detects the spheroidization of graphite rank by contrasting prefabricated classification collection of illustrative plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100583A CN1003095B (en) | 1985-04-01 | 1985-04-01 | Method for detecting spheroidization grade in front of furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100583A CN1003095B (en) | 1985-04-01 | 1985-04-01 | Method for detecting spheroidization grade in front of furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100583A CN85100583A (en) | 1986-08-20 |
| CN1003095B true CN1003095B (en) | 1989-01-18 |
Family
ID=4791282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100583A Expired CN1003095B (en) | 1985-04-01 | 1985-04-01 | Method for detecting spheroidization grade in front of furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003095B (en) |
-
1985
- 1985-04-01 CN CN85100583A patent/CN1003095B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100583A (en) | 1986-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4667725A (en) | Method for producing cast-iron, and in particular cast-iron which contains vermicular graphite | |
| CN101303319B (en) | Thermal analysis detection method and device for microstructure refinement effect of magnesium and magnesium alloy modification | |
| CN102998324B (en) | Thermal analysis and detection method for solidification grain size of magnesium alloy melt | |
| GB2283325A (en) | Thermal analysis of molten cast iron | |
| Zakharchenko et al. | New computer method of derivative thermal express analysis of cast iron for operational prediction of quality of melts and castings | |
| Chisamera et al. | Shrinkage evaluation in ductile iron as influenced by mould media and inoculant type | |
| Tadesse et al. | Volume change during the solidification of grey cast iron: its relation with the microstructural variation, comparison between experimental and theoretical analysis | |
| CN1003095B (en) | Method for detecting spheroidization grade in front of furnace | |
| CN120177546A (en) | A method for online detection of spheroidization rate and shrinkage index of ductile iron | |
| CN105388179B (en) | A kind of stokehold steel grade liquid-solid phase line temperature device for fast detecting and method | |
| CN100507533C (en) | Metal liquid integrative performance on-line intelligent checking system | |
| SE506802C2 (en) | Process for producing compact graphite iron comprising a thermal analysis step | |
| EP1056995A1 (en) | Device and process for thermal analysis of molten metals | |
| CA1239800A (en) | Method of controlling metallurgical structure of cast aluminum | |
| US3375106A (en) | Determination of carbon equivalence of hypereutectic cast iron | |
| RU2001119985A (en) | METHOD FOR DETERMINING THE NUMBER OF STRUCTURAL-MODIFICATING AGENT INTRODUCED IN THE IRON MELT, METHOD FOR PRODUCING CASTINGS FROM IRON, INSTALLATION FOR DETERMINING THE NUMBER OF STRUCTURAL-MODIFICATING SMOKE | |
| US4191885A (en) | Method for determining weight of molten metal in situ | |
| CN205263009U (en) | Quick detection device of stokehold steel grade liquid solidus temperature | |
| CN85201010U (en) | Electrical resistivity equipment for measuring liquid-solid transformation of some material | |
| JP2953903B2 (en) | Probe for molten metal | |
| SU993109A1 (en) | Free carbon in pig iron determination method | |
| SU381996A1 (en) | METHOD FOR DETERMINING THE CONTENT OF SILICON IN IRON-CARBON ALLOYS | |
| CN106404205A (en) | Three-channel stokehole molten iron quality management device and measurement method thereof | |
| CN111910043B (en) | Refining fixed-position temperature measurement method for measuring molten steel temperature of LF (ladle furnace) refining furnace | |
| SU1114949A1 (en) | Pig iron inoculation effect determination method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |