CN108311644A - A kind of casting mold and casting method of solution strengthening ferrite ductile cast iron wind power casting - Google Patents
A kind of casting mold and casting method of solution strengthening ferrite ductile cast iron wind power casting Download PDFInfo
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- CN108311644A CN108311644A CN201810230327.6A CN201810230327A CN108311644A CN 108311644 A CN108311644 A CN 108311644A CN 201810230327 A CN201810230327 A CN 201810230327A CN 108311644 A CN108311644 A CN 108311644A
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- 238000005266 casting Methods 0.000 title claims abstract description 160
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 23
- 238000005728 strengthening Methods 0.000 title claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 151
- 229910052742 iron Inorganic materials 0.000 claims abstract description 75
- 239000004576 sand Substances 0.000 claims abstract description 13
- 244000035744 Hura crepitans Species 0.000 claims abstract description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 19
- 230000002159 abnormal effect Effects 0.000 claims description 12
- 238000011081 inoculation Methods 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000007596 consolidation process Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000010183 spectrum analysis Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 238000005323 electroforming Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 16
- 239000011572 manganese Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 208000015943 Coeliac disease Diseases 0.000 description 9
- 229910000805 Pig iron Inorganic materials 0.000 description 9
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- -1 compound iron phosphide Chemical class 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000002893 slag Substances 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
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- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- FQNGWRSKYZLJDK-UHFFFAOYSA-N [Ca].[Ba] Chemical compound [Ca].[Ba] FQNGWRSKYZLJDK-UHFFFAOYSA-N 0.000 description 3
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
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- 239000010703 silicon Substances 0.000 description 2
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- 238000009423 ventilation Methods 0.000 description 2
- 241001614291 Anoplistes Species 0.000 description 1
- XEEYBQQBJWHFJM-BJUDXGSMSA-N Iron-55 Chemical compound [55Fe] XEEYBQQBJWHFJM-BJUDXGSMSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
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- 238000009510 drug design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- VAKIVKMUBMZANL-UHFFFAOYSA-N iron phosphide Chemical compound P.[Fe].[Fe].[Fe] VAKIVKMUBMZANL-UHFFFAOYSA-N 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
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- 238000009659 non-destructive testing Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000004080 punching 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
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
Abstract
The invention discloses a kind of casting mold and casting method of solution strengthening ferrite ductile cast iron wind power casting, the casting mold includes sandbox, sand mold and core, and sand mold and core combine the cavity structure to be formed and include：It is equipped in the casting mold：Casting cavity, the casting cavity shape are fitted the shape of the wind power casting, several riser are equipped with above the casting cavity；Running gate system, the running gate system include at least one into Tie Kou, at least one molten iron sprue, center splitter cavity, several molten iron runners and several filters；And temperature-increasing system, the temperature-increasing system include several hot-air channels, the hot-air channel is communicated in above the casting cavity.In the casting mold of the present invention, the running gate system is reasonably distributed, and a plurality of molten iron runner is substantially shorter the duration of pouring, ensures steady into iron, in conjunction with the use of the filter, can effectively avoid casting and cold shut and dreg defect occurs.The setting of the riser can guarantee the riser feeding of cavity.
Description
Technical field
The invention belongs to casting technology fields, and in particular to a kind of casting of solution strengthening ferrite ductile cast iron wind power casting
Type and casting method.
Background technology
Currently, with the aggravation that wind-power market competes, on the one hand wind-powered electricity generation manufacturer is researching and developing powerful generating set, another
Aspect controls manufacturing cost, and the lightweight of Wind turbines has become a kind of trend, and it is necessary that this requires wind power castings
Use the wind-powered electricity generation material of higher intensity.
Si is most common element in cast iron, ferritic intensity can be made to improve with reinforced ferrite.But recognized always in the past
Spheroidal graphite cast-iron is set to become fragile for Si.1949, first, the U.S. spheroidal graphite cast-iron patent of Mills applications thought, increase w (Si) amounts (>
2.5%) mechanical property, especially toughness, tensile strength and ductility be can obviously reduce.In actual production and subsequent research
In then find that above-mentioned statement has a significant limitation, 1998, Sweden defines to be measured with w (Si) produced QT450 for 3.2%,
It is measured with w (Si) and produces QT500 for 3.7%, QT500 is produced for 3.7% with w (Si).The research of Indexator companies of Sweden
Think, having no progeny for ferrite ductile cast iron can be made to stretch using Si solution strengthening ferrites the rank of tensile strength 500MPa
Long rate is 2 times of conventional ferrite-pearlite spheroidal graphite cast-iron, while yield strength increases, and yield ratio increases to 0.8 from 0.6, punching
It is slightly excellent to hit performance, overcomes production difficult point, and the spheroidal graphite cast-iron of this Si reinforcings and ADI are referred to as second generation spheroidal graphite cast-iron.So far,
U.S. etc. has received and grant 3 spheroidal graphite cast-iron patents strengthened with Si, and the states such as Finland also start to apply in production.Currently, many
Such new material has been classified as the project of focus development and research by external wind-powered electricity generation complete machine enterprise, is intended to be used in wind power casting.
Existing more external wind-powered electricity generations manufacturers, which are being studied, at present is applied to wind power casting by such material and has done a large amount of
Research work, some domestic strong wind-powered electricity generation manufacturers also begin to develop toward this direction.Silicon solution strengthening ferritic spheroidal graphite is cast
Iron is as a kind of novel wind-powered electricity generation material, on the one hand since high yield tensile ratio and good elongation can reduce casting section thickness,
And then mitigate casting weight.The mitigation of another aspect casting weight not only contributes to the reduction of manufacturing cost, and the weight of complete machine
Amount and cost can also be greatly reduced.Therefore, the research for such novel wind power material and application have become a kind of imperative
Trend.
But from the point of view of development situation, relative to common material, due to cast silicon solution strengthening ferrite ductile cast iron material
The iron liquid poor mobile performance of material has certain uniqueness and complexity in smelting technology, formative technology etc., especially makes
When larger with this cast size and complicated wind power casting, there are slag inclusion tendencies greatly, and shrinkage porosite tendency bigger etc. is asked
Topic so that the wind power casting of this material can not volume production, therefore be badly in need of to this material casting wind power casting technique carry out
Improve.
Invention content
The purpose of the present invention is to provide a kind of casting molds of solution strengthening ferrite ductile cast iron wind power casting, use the casting
Mold casting solution strengthening ferrite ductile cast iron wind power casting can effectively solve slag inclusion and shrinkage porosite phenomenon, improve wind power casting
Volume production can be realized while energy.
The casting mold of the solution strengthening ferrite ductile cast iron wind power casting of the present invention includes sandbox, sand mold and core, spy
Sign is that the cavity structure of the casting mold includes：
Casting cavity, the casting cavity are composed of sand mold and core, and the shape of form fit wind power casting is described
Several riser are equipped with above casting cavity；
Running gate system, the running gate system include at least one into Tie Kou, at least one molten iron sprue, center splitter cavity
With several molten iron runners, the molten iron sprue and the molten iron runner are set to the casting mold bottom, the center shunting
Chamber is set to the casting mold bottom centre position；Molten iron sprue upstream is connected with described into iron mouth, downstream and the center
Splitter cavity is connected；Several molten iron runners are uniformly distributed in divergent shape, and upstream is connected with the center splitter cavity, downstream
End is passed through the casting cavity, and filter is respectively equipped on several molten iron runners；And
Temperature-increasing system, the temperature-increasing system include several hot-air channels, and the hot-air channel is communicated in the casting type
Above chamber.
It is identical with common mold making process when the casting mold makes, sand mold by into sandbox knockout be molded, in sand mold
There are running gate system, temperature-increasing system and central cavities, and core is then put into central cavity, casting mold, sand mold are formed after mould assembling
It is combined with core, centre forms casting cavity.
In the preferred embodiment of the present invention, the wind power casting is wind-powered electricity generation pedestal, and the wind-powered electricity generation pedestal includes bottom method
Blue, abnormal curved surface and wheel hub installing ring, the flange in the bottom are set to the bottom of the abnormal curved surface, and the wheel hub installing ring is set to
The top side of the abnormal curved surface；The shape of the casting cavity shape fitting wind-powered electricity generation pedestal.
Preferably, the running gate system inner wall uses refractory fireclay block；The filter is floamed ceramics filtrating piece.
Preferably, the sandbox is plastic box or metal box.
The present invention also aims to disclose a kind of casting method of solution strengthening ferrite ductile cast iron wind power casting,
Including step：
(a) furnace charge is smelted into molten iron；Charging component is adjusted by spectrum analysis, controls carbon equivalent C in molten iron：3.4%
~3.5%, Si：3.7%~4.0%, Mn：0.1%~0.35%, P：＜ 0.04%, S：≤ 0.012%, Mg：0.04%~
0.07%, Cr：＜ 0.05%, Ti：＜ 0.03%；
(b) by liquid iron balling processing and inoculation；
(c) it is poured into the casting mold and fills type, solidifies up to casting.
The method through the invention, the casting of casting can meet claimed below：
(1) metallographic structure：Ferrite+graphite nodule, ferrite >=95%, (cementite+iron phosphide eutectic)<0.5%, Oxygen potential >=
90%, size of graphite ball reaches 5 grades of 945 standards of ISO or more；
(2) mechanical property：Tensile strength Rm >=530MPa, yield strength Rp0.2 >=400MPa, elongation A >=12.5%.
(3) -20 DEG C of low temperature non-notch ballistic works：Three sample single value >=5J, average value >=7J；
(4) center portion nondestructive testing, the UT of important area meet 2 grades of EN12680-3, remaining meets 3 grades；Surface nondestructive is examined
It tests, the MT of important area meets 2 grades of EN1369, remaining meets 3 grades.
Material element composition is carried out combining consideration and control in the step a of the method for the invention.
Wherein, C content influences the mobility of spheroidal graphite cast-iron very big, and the flowing of spheroidal graphite cast-iron can be improved by improving C content
Property, when C content is 3.4%~3.5%, mobility is best, is conducive to castable, feeding.
Si contents influence the intensity and elongation percentage of spheroidal graphite cast-iron, and the intensity of spheroidal graphite cast-iron can be improved by carrying high Si content, but
Elongation percentage can be reduced, when Si contents are 3.7%~4.0%, mechanical property can be met the requirements.
Mn has detrimental effect to the impact flexibility and brittle transition temperature of spheroidal graphite cast-iron, therefore selects low manganese hot metal and give up
Steel controls Mn contents 0.1%~0.35% as raw material.
P is a kind of harmful element, its solubility in cast iron is extremely low, when its content is less than 0.05%, is solid-solution in matrix
In, mechanical property is had little effect.When content is more than 0.05%, phosphorus is easily segregated in eutectic cell boundary, formed binary,
Ternary or compound iron phosphide eutectic reduce the toughness of cast iron, and phosphorus improves the tough brittle transition temperature of cast iron, therefore, control P content ＜
0.04%.
The presence of S can largely consume the nodularization element in iron liquid, form the sulfide of magnesium and rare earth, cause slag inclusion, stomata
Etc. casting flaws, therefore, control S content≤0.012%
Control for realization to element, preferably, the group of the furnace charge is divided into：The new pig iron 40~50%, foundry returns 30~
40%, steel scrap 10~20%.
Further, the new pig iron is high-purity pig iron, wherein C：>=4.0%, Mn：≤ 0.10%, P：≤
0.025%, S：≤ 0.015%, anti-nodularization harmful alloying elements summation≤0.08%；The steel scrap is useless for sheet carbon
Steel, wherein C：≤ 0.15%, Mn：≤ 0.40%, P：≤ 0.03%, S：≤ 0.03%.
Suitable nodulizer and inovulant ingredient, optimization spheriodization process thereof and inoculated technology etc. are selected, can not only be met
The performance requirement of large-scale wind electricity casting, moreover it is possible to ensure the stability of castings production, the consistency of properties of product.It makes and is suitable for
The nodulizer of wind power casting new material, the ingredient of inovulant and treatment process, it is good to obtain metallographic structure, no chunky graphite and
The others abnormal graphite such as spike graphite occurs, and graphite nodule rounding, number of graphite ball is more, the good casting of comprehensive mechanical property.
Preferably, in step b, low RE-Mg-ferrosilicon alloy nodulizer, preferably 50% angstrom of willing Asia 5813+50% peak are selected
YFQ-55A, and spheroidising is carried out using the method that pours, nodulizer addition is 1.0%~1.2%；Specially：It is by nodulizer
It is embedded within casting ladle and appropriate consolidation, carries out spheroidising, start spheroidizing reacion when going out iron 2/3rds, nodularization carries out
Before should control 1400~1470 DEG C of tapping temperature.
Preferably, in step b, Si-Ca-Ba inovulant is selected to carry out inoculation, innoculant adding quantity is weight of molten iron
0.6%~0.65%, and breed in two times, specially：Covering is bred is added in molten iron surface, current-following inoculation before and after nodularization is skimmed
It is to be added in molten iron in casting process.Preferably, covering is bred using angstrom Kenko calcium barium 3-8mm, addition 0.5%；With
Stream is bred using angstrom willing sulphur oxygen 0.2-0.7mm, and addition is 0.10~0.15%.
Preferably, step c pouring temperatures are 1360~1370 DEG C.
Preferably, before step c cast, with 150 DEG C or so of hot wind by the hot-air channel to the casting cavity
It is aerated and heats.
Preferably, carrying out cooling s imulation using MAGMA or Any casting softwares, added in the position for being also easy to produce shrinkage porosite
Chill.
The beneficial effects of the present invention are：
In the casting mold of the present invention, the running gate system is reasonably distributed, and a plurality of molten iron runner is substantially shorter the duration of pouring,
Ensure steady into iron, in conjunction with the use of the filter, can effectively avoid casting and cold shut and dreg defect occur.The riser
Specific aim is arranged, it is ensured that the riser feeding of cavity.
And in the casting method of the present invention, pass through the rational design of casting mold, control, nodulizer and the inovulant of chemical composition
Selection, nodularization and inoculation process optimization, the design of running gate system, the arrangement of chill riser and cavity hot blast temperature
Setting etc..It can effectively solve the problems, such as the castings such as the shrinkage porosite being also easy to produce in casting process, slag inclusion, cold shut, deformation, it not only can be with
Effectively improve the mechanical property of wind power casting, moreover it is possible to realize volume production.
The present invention uses the pure ferrite matrix EN-GJS-600-10 casting of solution strengthening principle production by the method
Hardness is evenly distributed, and can have preferable machinability, extends cutter life, reduces machining cost.
Description of the drawings
Fig. 1 is the schematic diagram of fit pedestal；
Fig. 2 be casting mold of the present invention inside casting cavity, running gate system and temperature-increasing system stereoscopic schematic diagram；
Fig. 3 be casting mold of the present invention inside casting cavity, running gate system and temperature-increasing system bottom schematic view；
Fig. 4 is the stereoscopic schematic diagram of common casting mold interior mold cavity and casting system；
Fig. 5 is the bottom schematic view of common casting mold interior mold cavity and casting system.
Reference numeral
Flange in the bottom 11, abnormal curved surface 12, wheel hub installing ring 13；
Casting mold of the present invention：Casting cavity 21；Running gate system 22, into iron mouth 221, molten iron sprue 222, center splitter cavity
223, molten iron runner 224, filter 225；Temperature-increasing system 23；Riser 24；
Common casting mold：Casting cavity 31；Running gate system 32.
Specific implementation mode
Below in conjunction with specific embodiment, the invention will be further described.It should be understood that following embodiment is merely to illustrate this
Invention is not for restriction the scope of the present invention.
The casting mold of 1 wind-powered electricity generation pedestal of embodiment
Fig. 1 show GE3.2MW-130 zoarium pedestals, including flange in the bottom 11, abnormal curved surface 12 and wheel hub installing ring 13,
Flange in the bottom 11 is set to the bottom of abnormal curved surface 12, and wheel hub installing ring 13 is set to the top side of abnormal curved surface 12.The wind-powered electricity generation bottom
Seat weight about 18.17T, full-size 4042mm*3600mm*3010mm, main wall thickness 70-200mm, material QT600-10.
By taking above-mentioned GE3.2MW-130 zoariums pedestal (QT600-10) as an example, the present invention corresponds to the solution strengthening iron element of design
The casting mold of body spheroidal graphite cast-iron wind power casting, including sandbox, sand mold and core.Sand mold by into sandbox knockout be molded, place into
Core forms casting mold after mould assembling.It is equipped in casting mold：Casting cavity 21, running gate system 22 and temperature-increasing system 23.Casting cavity 21,
Running gate system 22 and temperature-increasing system 23 are used as internal structure, are collectively constituted by sand mold and core, a combination thereof shape such as Fig. 2 and 3 institutes
Show, the shape of 21 form fit wind-powered electricity generation pedestal of casting cavity, several riser 24 are equipped with above casting cavity.Running gate system 22 includes
To one into 221, two molten iron sprues 222 of iron mouth, center splitter cavity 223 and 9 molten iron runners 224, molten iron sprue
222 and molten iron runner 224 be set to casting mold bottom, center splitter cavity 223 be set to casting mold bottom centre position；Molten iron sprue 22
Upstream is connected with into iron mouth 221, and downstream is connected with center splitter cavity 223；Several molten iron runners 222 uniformly divide in divergent shape
Cloth, and upstream is connected with center splitter cavity 223, downstream end is passed through on 21,9 molten iron runners 224 of casting cavity and sets respectively
There is filter 225.Temperature-increasing system 23 includes several hot-air channels, and hot-air channel is communicated in 21 top of casting cavity.
Embodiment 2 casts GE3.2MW-130 zoariums pedestal (QT600-10) using the casting mold of embodiment 1
Casting step：
(a) melt iron
Furnace charge：The new pig iron 40~50%, foundry returns 30~40%, steel scrap 10~20%.
Further, the new pig iron is high-purity pig iron, wherein C：>=4.0%, Mn：≤ 0.10%, P：≤
0.025%, S：≤ 0.015%, anti-nodularization harmful alloying elements summation≤0.08%；The steel scrap is useless for sheet carbon
Steel, wherein C：≤ 0.15%, Mn：≤ 0.40%, P：≤ 0.03%, S：≤ 0.03%.
Furnace charge is smelted into molten iron；Charging component is adjusted by spectrum analysis, controls carbon equivalent C in molten iron：3.4%~
3.5%, Si：3.7%~4.0%, Mn：0.1%~0.35%, P：＜ 0.04%, S：≤ 0.012%, Mg：0.04%~
0.07%, Cr：＜ 0.05%, Ti：＜ 0.03%；
(b) spheroidising and inoculation
Low RE-Mg-ferrosilicon alloy nodulizer (the 50% angstrom of willing Asias 5813+50% peak YFQ-55A) is selected, and uses and pours method
Spheroidising is carried out, nodulizer addition is 1.0%~1.2%；Specially：Nodulizer is embedded within casting ladle simultaneously appropriate by it
Consolidation carries out spheroidising, starts spheroidizing reacion when going out iron 2/3rds, and nodularization should control tapping temperature before carrying out
1400~1470 DEG C.
Si-Ca-Ba inovulant is selected to carry out inoculation, innoculant adding quantity is the 0.6%~0.65% of weight of molten iron, and
It breeds in two times, specially：Covering breeds (0.5% angstrom of Kenko calcium barium 3-8mm) and is added in molten iron surface before and after nodularization is skimmed, with
Stream, which breeds (0.10~0.15% angstrom of willing sulphur oxygen 0.2-0.7mm), to be added in molten iron in casting process.
(c) type is filled
The casting cavity is aerated by the hot-air channel with 150 DEG C or so of hot wind and is heated.Ventilation heats
After full 10h, type is filled in the molten iron casting to the casting mold of embodiment 1 by nodularization and after breeding, is solidified up to casting.
Cooling s imulation is carried out using MAGMA or Any casting softwares, when throwing mold process, in the position for being also easy to produce shrinkage porosite
It sets and adds chill.
This method advantage：
1, iron liquid flows through running gate system, through 9 molten iron runner shuntings and 9 filter filterings subsequently into casting type
Chamber, it is ensured that the degree of purity of molten iron and into iron fill type uniform and stable and shorten the duration of pouring, casting can be avoided slag inclusion occur as possible
Defect.
2, casting cavity is carried out to heat processing by divulging information in advance, effectively avoids cold shut phenomenon；It is being also easy to produce contracting simultaneously
Loose defective locations place chill, can effectively avoid shrinkage porosite.
3, the pure ferrite matrix EN-GJS-600-10 casting hardness produced using solution strengthening principle is evenly distributed, can
To there is preferable machinability, cutter life is extended, reduces machining cost.
Comparative example 1 uses common casting mold casting GE2.5MW-120 zoariums pedestal (QT400-18)
GE2.5MW-120 zoariums understructure is identical as the GE3.2MW-130 zoarium pedestals of embodiment 1, including bottom method
Blue, abnormal curved surface and wheel hub installing ring.The wind-powered electricity generation pedestal weight about 18.66T, full-size 4022mm*3920mm*2642mm,
Main wall thickness 60-128mm, material QT400-18.
By taking GE2.5MW-120 zoariums pedestal (QT400-18) as an example, comparative example 1 uses common casting mold, is equipped in casting mold：Casting
Part cavity 31 and running gate system 32, as shown in Figures 4 and 5, casting cavity shape are fitted the shape of wind-powered electricity generation pedestal and standing of turning on one's side, casting
Several outlets are equipped with above part cavity.Running gate system includes two into Tie Kou, filtration system and two molten iron sprues；Molten iron
Sprue upstream is connected with into iron mouth, and downstream is passed through casting cavity.
Casting step：
(a) melt iron
Furnace charge：The new pig iron 55~75%, foundry returns 20~35%, steel scrap 5~20%.
Further, the new pig iron is high-purity pig iron, wherein C：>=4.0%, Mn：≤ 0.10%, P：≤
0.025%, S：≤ 0.015%, anti-nodularization harmful alloying elements summation≤0.08%；The steel scrap is useless for sheet carbon
Steel, wherein C：≤ 0.15%, Mn：≤ 0.40%, P：≤ 0.03%, S：≤ 0.03%.
Furnace charge is smelted into molten iron；Charging component is adjusted by spectrum analysis, controls carbon equivalent C in molten iron：3.75%~
3.85%, Si：1.8%~2.4%, Mn：0.1%~0.35%, P：≤ 0.04%, S：≤ 0.012%, Mg：0.04%~
0.07%, Cr：＜ 0.05%, Ti：＜ 0.03%；
(b) spheroidising and inoculation
Low RE-Mg-ferrosilicon alloy nodulizer (angstrom agree 5813) is selected, and spheroidising, nodulizer are carried out using the method that pours
Addition is 1.0%~1.1%；Specially：Nodulizer is embedded within casting ladle and appropriate consolidation by it, carries out spheroidising,
Start spheroidizing reacion when going out iron 2/3rds, nodularization should control 1400~1470 DEG C of tapping temperature before carrying out.
Si-Ca-Ba inovulant is selected to carry out inoculation, innoculant adding quantity is the 0.7%~1.25% of weight of molten iron, and
It breeds in three times, specially：Covering breeds (0.2-0.3%75 silicon iron inoculator 3-8mm) and is added in molten iron table before nodularization is skimmed
Face once breeds (0.4-0.8% angstroms of Kenko calcium barium 3-8mm) and is added in molten iron surface after nodularization is skimmed, current-following inoculation (0.10~
0.15% angstrom of willing sulphur oxygen 0.2-0.7mm) it is to be added in molten iron in casting process.
(c) type is filled
The casting cavity is aerated by the hot-air channel with 150 DEG C or so of hot wind and is heated.Ventilation heats
After full 8h, type is filled in the molten iron casting to casting mold by nodularization and after breeding, is solidified up to casting.
The wind-powered electricity generation pedestal cast to embodiment 2 and comparative example 1 carries out performance evaluation respectively
Embodiment 2：GE3.2MW-130 zoarium pedestals, material QT600-10, tensile strength >=530MPa, 0.2% surrender
Intensity >=400Mpa, elongation percentage >=12.5%, the impact resistance (non-notch) at -20 DEG C ± 2 DEG C：The impact of three samples is average
Value >=7J is individually not less than 5J.
Comparative example 1：GE2.5MW-120 zoarium pedestals, material QT400-18, tensile strength >=370MPa, 0.2% surrender
Intensity >=220Mpa, elongation percentage >=12%, the impact resistance (non-notch) at -20 DEG C ± 2 DEG C：The impact average value of three samples
>=10J is individually not less than 7J.
To sum up：1, solution strengthening ferrite ductile cast iron wind power casting has the combination of better mechanical property (tensile strength is bent
Take intensity and elongation percentage), designer can be made to reduce casting section thickness, to mitigate casting weight.2, solution strengthening ferrite
The slag inclusion of spheroidal graphite cast-iron wind power casting, shrinkage porosite are inclined to bigger, every to degree of purity, hot metal composition and mold temperature of molten iron etc. to join
Several requirement highers.
The preferred embodiment of the invention is illustrated above, but the invention is not limited to implement
Example, those skilled in the art are without prejudice to can also make various equivalent modifications under precondition for innovation of the present invention or replace
It changes, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (10)
1. a kind of casting mold of solution strengthening ferrite ductile cast iron wind power casting comprising sandbox, sand mold and core, feature exist
In the cavity structure of the casting mold includes：
Casting cavity, the casting cavity are composed of sand mold and core, the shape of form fit wind power casting, the casting
Several riser are equipped with above cavity；
Running gate system, if the running gate system include it is at least one into Tie Kou, at least one molten iron sprue, center splitter cavity and
Dry molten iron runner, the molten iron sprue and the molten iron runner are set to the casting mold bottom, and the center splitter cavity is set
In the casting mold bottom centre position；Molten iron sprue upstream is connected with described into iron mouth, and downstream is shunted with the center
Chamber is connected；Several molten iron runners are uniformly distributed in divergent shape, and upstream is connected with the center splitter cavity, downstream end
It is passed through the casting cavity, filter is respectively equipped on several molten iron runners；And
Temperature-increasing system, the temperature-increasing system include several hot-air channels, and the hot-air channel is communicated on the casting cavity
Side.
2. the casting mold of solution strengthening ferrite ductile cast iron wind power casting as described in claim 1, which is characterized in that the wind
Electroforming part is wind-powered electricity generation pedestal, and the wind-powered electricity generation pedestal includes flange in the bottom, abnormal curved surface and wheel hub installing ring, and the flange in the bottom is set
In the bottom of the abnormal curved surface, the wheel hub installing ring is set to the top side of the abnormal curved surface；The casting cavity shape
Shape is fitted the shape of wind-powered electricity generation pedestal.
3. the casting mold of solution strengthening ferrite ductile cast iron wind power casting as described in claim 1, which is characterized in that described to pour
Injection system inner wall uses refractory fireclay block；The filter is floamed ceramics filtrating piece.
4. the casting mold of solution strengthening ferrite ductile cast iron wind power casting as described in claim 1, which is characterized in that the sand
Case is plastic box or metal box.
5. a kind of casting method of solution strengthening ferrite ductile cast iron wind power casting, which is characterized in that it includes step：
(a) furnace charge is smelted into molten iron；Charging component is adjusted by spectrum analysis, controls C in molten iron：3.4%~3.5%, Si：
3.7%~4.0%, Mn：0.1%~0.35%, P：＜ 0.04%, S：≤ 0.012%, Mg：0.04%~0.07%, Cr：＜
0.05%, Ti：＜ 0.03%；
(b) by liquid iron balling processing and inoculation；
(c) it is poured into Claims 1 to 4 any one of them casting mold and fills type, solidifies up to casting.
6. method as claimed in claim 5, which is characterized in that in step b, low RE-Mg-ferrosilicon alloy nodulizer is selected, and
Spheroidising is carried out using the method that pours, nodulizer addition is 1.0%~1.2%；Specially：Nodulizer is embedded into casting ladle by it
Within and appropriate consolidation, carry out spheroidising, start spheroidizing reacion when going out iron 2/3rds, nodularization should be controlled before carrying out
1400~1470 DEG C of tapping temperature.
7. method as claimed in claim 5, which is characterized in that in step b, Si-Ca-Ba inovulant is selected to carry out inoculation,
Innoculant adding quantity is the 0.6%~0.65% of weight of molten iron, and is bred in two times, specially：Covering is bred skims in nodularization
Front and back to be added in molten iron surface, current-following inoculation is added in molten iron in casting process.
8. method as claimed in claim 5, which is characterized in that step c pouring temperatures are 1360~1370 DEG C.
9. method as claimed in claim 5, which is characterized in that before step c cast, pass through institute with 150 DEG C or so of hot wind
It states hot-air channel the casting cavity is aerated and heat.
10. method as claimed in claim 8, which is characterized in that carry out cooling mould using MAGMA or Any casting softwares
It is quasi-, add chill in the position for being also easy to produce shrinkage porosite.
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