CN106424571A - Cavity structure of middle box of wind turbine generator system and method for preparing middle box through cavity structure - Google Patents
Cavity structure of middle box of wind turbine generator system and method for preparing middle box through cavity structure Download PDFInfo
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- CN106424571A CN106424571A CN201610871663.XA CN201610871663A CN106424571A CN 106424571 A CN106424571 A CN 106424571A CN 201610871663 A CN201610871663 A CN 201610871663A CN 106424571 A CN106424571 A CN 106424571A
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- 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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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Abstract
The invention provides a cavity structure of a middle box of a wind turbine generator system and a method for preparing the middle box through the cavity structure. The structure comprises a gating system, a middle box cavity and a gas outlet, wherein the gating system comprises a downsprue and a transitional sprue which communicate with each other in sequence; the downsprue is used for introducing casting molten iron into the gating system; the transitional sprue is used for introducing the casting molten iron into the middle box cavity; an inner gate is arranged on the transitional sprue and communicates with the middle box cavity. The cavity structure can overcome casting defects of severe turbulence, rolling-in, gas absorption, excessive oxidation of metals and the like, and has the advantages of being wide in temperature resistance range and high in strength and meeting the requirements of EN12680.3 and DINEN1369 standards.
Description
Technical field
The invention belongs to the middle casing casting technology field of wind power generating set is and in particular to a kind of wind power generating set
The cavity structure of middle casing, the method utilizing casing in the preparation of this structure.
Background technology
Wind energy is a kind of regenerative resource of cleaning, by the most attention of countries in the world.Front casing, rear box, raising middle flask
The nodular iron castings such as body, planet carrier as the key components and partss of gearbox of wind turbine, throughout the year at up to tens meters to more than 100
The high dry running of rice, most of foundry goods will be on active service 20 years under -20 DEG C of even -40 DEG C environment, and integrated performance index requires higher.
The reliability of gear-box has significant impact for the safety of Wind turbines, and fault recovery cost is also extremely expensive, it is reported that
Design year generates electricity the 1.5MW unit of 2200 hours, and a gear-box significant trouble occurs, only gear box arrangement take 1,000,000 it
Between, such as estimate that 200,000 about, its every restoration costs summation will be 1,300,000 about plus lifting cost, traffic expense, labour cost.
Middle casing particularly therein, plays the interconnection function of key, and the presence of its casting flaw will have a strong impact on use
Effect.Such as with foundry goods outer profile size Φ 1910mm × Φ 1297mm × 395mm, as a example the middle casing of net weight 1200kg：Should
Product is the truncated cone-shaped box typed structure of wall thickness 25mm, thickest 122mm.Key points for foundry is mainly reflected in：(1)70mm×
105mm × 180mm attached casting test block mechanical property meets the regulation of Client Enterprise standard, tensile strength >=360MPa, yield strength
>=220MPa, elongation percentage >=12% are it is desirable to the ballistic work individual sample of -20 DEG C of Xia Shi V-notch is not less than 7J, three samples
Meansigma methodss be not less than 10J；(2) 70mm × 105mm × 180mm attached casting test block metallographic structure meets Client Enterprise (ISO 945)
The regulation of standard, ferrite >=90%, pearlite≤10%, cementite≤1%, Oxygen potential >=90%, graphite size 4～7；
(3) must through 100% ultrasound wave and magnetic powder inspection, key position meets 1 grade in EN12680.3 and DINEN1369 standard
Require, 2 grades of other position.
Therefore, cast this big size middle casing, occur when will overcome such as iron liquid stamp heavy turbulence, be involved in,
Or suck gas and make the casting flaws such as metal over oxidation, and above-mentioned use requirement can be met, it is that this area is urgently to be resolved hurrily
Technical problem.
Content of the invention
The present invention is directed to the above-mentioned deficiency of prior art, provides one kind to be avoided that heavy turbulence, prevents from being involved in, sucks gas
With make the casting flaws such as metal over oxidation, and there is temperature resistant range width, intensity is high, can meet EN12680.3 and DINEN1369
The cavity structure of the middle casing of wind power generating set that standard requires.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：A kind of middle casing of wind power generating set
Cavity structure, this structure include running gate system, middle box body shape chamber and be located at middle box body shape chamber on gas outlet；Described cast
System includes the sprue being sequentially communicated and transition running channel；Described sprue is used for for foundry goods melting iron liquid being incorporated into cast system
In system, described transition running channel is used for for foundry goods melting iron liquid being incorporated into middle box body shape chamber；It is provided with described transition running channel
Ingate, ingate is connected with middle box body shape chamber.
Preferably, described transition running channel includes First Transition running channel, the second transition running channel and the 3rd being sequentially communicated
Transition running channel；Described First Transition running channel is second that the second cylindrical, described transition running channel is fan-shaped, described sector
Transition running channel is two, is divided into the left and right sides of cylindrical First Transition running channel；The 3rd described transition running channel be circular arc,
It is connected to the outward flange of the second transition running channel；The upper surface of the 3rd described transition running channel is ingate, ingate and middle casing
Die cavity is connected；Described gas outlet is located on the end face in middle box body shape chamber and is connected with die cavity, and described First Transition pours
Road, the second transition running channel and the 3rd transition running channel are located at the side of opposite outlets on middle box body shape chamber.
Using said structure it is achieved that the Stable Filling of iron liquid, First Transition running channel, the second transition running channel, the 3rd transition
The setting of running channel, its Main Function is for iron liquid Stable Filling, it is to avoid heavy turbulence, prevents from being involved in, sucks gas and make gold
Belong to over oxidation.
Preferably, the sectional area of described sprue is Σ F1, First Transition running channel running channel and the second transition running channel are even
The sectional area meeting place is Σ F2, the sectional area of the second transition running channel running channel and the 3rd transition running channel junction is Σ F3, ingate
Sectional area is Σ F4,ΣF1∶ΣF2∶ΣF3∶ΣF4=1: 4.1: 7.8: 11.6.Using said structure, further ensure iron liquid
Stable Filling, it is to avoid heavy turbulence, prevents from being involved in, sucks gas and make metal over oxidation；And, make iron liquid casting process and
Early solidification is under higher ferrostatic pressure effect, to be entered using the rear benefit amount of molten iron and the graphitization expansion of adjacent area
Row is from feeding.
Preferably, described middle box body shape chamber be axially located in gas outlet opposite side be provided with the first core, first
The outer end of core is provided with the first core print；Described middle box body shape chamber is axially located in gas outlet side and is provided with the second sand
Core, the outer end of the second core are provided with the second core print；3rd core and are provided with the described end face in middle box body shape chamber
Four cores；The structure of this foundry goods is the truncated cone-shaped box typed structure with gusset, adopts above-mentioned 4 kinds of cores in die cavity altogether.
Preferably, described works off one's feeling vent one's spleen as 9, Φ 20mm (bore of each gas outlet is 20mm)；In circumferentially disposed
On the top surface in middle box body shape chamber；Said structure is used for excluding type intracavity gas it is ensured that the defect such as pore-free in foundry goods.
Preferably, being provided with chill on described middle box body shape chamber, described chill includes the first chill, the second chill
With the 3rd chill；The first described chill is located at the (end face that gas outlet is located on the top surface of first flange in middle box body shape chamber
On), the second described chill is located at the (end that middle box body shape chamber is located on the top surface of middle box body shape chamber second flange positioned at gas outlet
End face within face, is coaxially disposed with first flange), the 3rd described chill is located at the bottom surface of the 3rd flange in middle box body shape chamber
Upper (end face in the middle box body shape chamber of the second chill opposite end)；The thickness of chill takes casting section thickness (specifically to place chill position
Casting section thickness) 0.5～0.8 times；Three kinds of chill all circumferences are uniformly distributed on respective flange face.Due to middle box casting
For box typed structure, wall thickness differs greatly, and the thick position rate of cooling of wall thickness is excessively slow, setting time is long, easily causes shrinkage cavity and porosity
Etc. defect；In order to realize Equilibrium Solidification, the thick position of wall thickness properly increases rate of cooling, and the method improving rate of cooling mainly has
Three kinds, that is,：Plus chill, pressure cooling (as water flowing, mist, liquid nitrogen etc.), chill and pressure cooling match；Due to 2.3MW wind-force
In generating set, box casting adopts furan resin-sand mold casting, and local location rate of cooling is relatively slow quickly to be cooled down it is difficult to meet
Requirement, consider production cost and cool down using cast iron chill and graphite chilling block to eliminate because of wall thickness not with reference to physical condition
The bad thermal center effect all brought.
Preferably, the first described chill thickness 60mm, every piece of spacing 35mm, totally 18 pieces；The second described chill is thick
80mm, every piece of spacing 30mm, totally 12 pieces；The 3rd described chill thickness 40mm, every piece of spacing 30mm, totally 16 pieces.
The middle box body shape chamber of the present invention can also be considered as the shape of finally middle box casting, namely middle casing raw materials melt
Iron liquid houses hungry cavity, iron liquid defines final middle box casting after cooling down.
The method of casing, concrete steps bag in a kind of cavity structure preparation of middle casing using above-mentioned wind power generating set
Include：
(1) first, according to the composition of the middle box casting of following proportioning：C 3.75%～3.80%, Si 1.90%～
2.20%, Mn ＜ 0.20%, P ＜ 0.03%, S ＜ 0.012%, RE (rare earth) 0.010%～0.020%, Mg 0.025%～
0.040%Sb0.003%～0.006%, CE (carbon equivalent=C+Si/3) 4.38%～4.48%, balance of ferrum preparation raw material；
(2) (furnace charge is joined by the melting of furnace cupola and medium-frequency induction furnace, raw material to be carried out the double melting of composition adjustment
For 50%～70% pig iron, 20%～40% foundry return, 10%～20% steel scrap, wherein foundry return is generally pouring of same material to ratio
Rising head, waste product, are easy to alloy reuse reduces cost, are also beneficial to hot metal composition control)；
(3) method spheroidising is poured using dam-type, dykes and dams height is 100～200mm, nodulizer adds nodularization bag dykes and dams
Behind body of heater side, plus inovulant covers on nodulizer, and nodulizer addition is the 1.0%～1.2% of weight of molten iron；
(4) adopt late inoculation processing mode：Add the inovulant of iron liquid 0.2-0.4wt% with iron liquid stream when tapping a blast furnace, pregnant
Educate agent granularity 3～8mm, iron liquid occurs inoculation(effect) while carrying out spheroidising, and (i.e. above-mentioned steps (3) are in nodulizer overlying
The inovulant of lid)；Before cast, molten iron is added iron liquid 0.2～0.3wt%'s on molten iron surface when nodularization bag proceeds to casting ladle
Granularity is the inovulant of 3～8mm as late inoculation；
(5) cavity structure of middle casing is fixed in sandbox；Iron liquid casting temperature control at 1330-1350 DEG C, by ferrum
Liquid is poured into middle box body shape intracavity through running gate system, box casting in obtaining after condensation.
75FeSi selected by the above-mentioned inovulant of the present invention, for improving pregnant effect, and rationally controls whole silicon amount according to production
Condition, using late inoculation processing mode, can effectively prevent inoculation fade from improving pregnant effect.
The setting of pouring temperature of the present invention is because：Pouring temperature is too high, and amount of contraction can increase, and is also easy to produce shrinkage cavity and contracting
Pine；Pouring temperature is too low, and cold shut defect also occurs at thin-walled；For the ease of controlling pouring temperature, iron liquid casting temperature control
At 1330-1350 DEG C.
The above-mentioned sandbox of the present invention adopts three-cavity moulding, and the mould in three-cavity moulding is divided into mold, lower mould and all solid
It is scheduled on corresponding template (making on part casting mold template), constitute complete after the die cavity matched moulds of mold and the formation of lower mould
Middle box body shape chamber；Mould 20mm～40mm high strength multi-layer splint construction, template 20mm～40mm high strength multi-layer clamping plate
Assemble with the underframe of 200mm × 100mm × 10mm thickness square tubes soldering, the square tube of underframe length direction must use whole root bead
Connect；Main purpose is to not make die deformation, improving the overall structure performance of mould, be no less than 80mm in underframe upper berth thickness
High strength multi-layer clamping plate.It is deep that mould will embed in template 10mm, then uses M20 screw and underframe sled jail, with ensure template with
Mould fixation.
Brief description
The cavity structure schematic diagram of the middle casing of Fig. 1 wind power generating set of the present invention.
Injection system structure schematic diagram in the cavity structure of middle casing of Fig. 2 wind power generating set of the present invention.
First sand core structure schematic diagram in the cavity structure of middle casing of Fig. 3 wind power generating set of the present invention.
Second sand core structure schematic diagram in the cavity structure of middle casing of Fig. 4 wind power generating set of the present invention.
The middle box body shape cavity configuration being provided with core in the cavity structure of middle casing of Fig. 5 wind power generating set of the present invention shows
It is intended to (second and third, four cores visible).
The middle box body shape cavity configuration being provided with core in the cavity structure of middle casing of Fig. 6 wind power generating set of the present invention shows
It is intended to (the first core is visible).
The middle box body shape cavity configuration being provided with chill in the cavity structure of middle casing of Fig. 7 wind power generating set of the present invention shows
It is intended to (first and second chill is visible).
The middle box body shape cavity configuration being provided with chill in the cavity structure of middle casing of Fig. 8 wind power generating set of the present invention shows
It is intended to (the 3rd chill is visible).
The upper die structure schematic diagram that the cavity structure of the middle casing of Fig. 9 wind power generating set of the present invention adopts.
The lower die structure schematic diagram that the cavity structure of the middle casing of Figure 10 wind power generating set of the present invention adopts.
The casting sample metallographic structure figure of Figure 11 embodiment of the present invention preparation.
Specific embodiment
Below by accompanying drawing, the present invention is described in further detail, but the present invention is not limited solely to following examples.
Embodiment
With foundry goods outer profile size Φ 1910mm × Φ 1297mm × 395mm, net weight 1200kg, castings material EN-GJS-
400-18U-LT, this product is the truncated cone-shaped box typed structure of wall thickness 25mm, as a example thickest 122mm.
As one kind embodiment of specific embodiment, as shown in accompanying drawing 1-2：A kind of middle casing of wind power generating set of the present invention
Cavity structure, this structure includes running gate system 1, middle box body shape chamber 2 and gas outlet 3, and gas outlet is located on middle box body shape chamber；Institute
The running gate system stated includes the sprue 4 (similar to L-type) being sequentially communicated and transition running channel 5；Described transition running channel includes
One transition running channel 5.1, the second transition running channel 5.2 and the 3rd transition running channel 5.3；Described First Transition running channel is cylindrical, institute
The the second transition running channel stated is sector, and the second transition running channel of described sector is two, be divided into cylindrical First Transition pours
The left and right sides in road；The 3rd described transition running channel is circular arc, is connected to the outward flange of the second transition running channel；Described the 3rd
The upper surface of transition running channel is ingate 6, ingate is connected with middle box body shape chamber；Described gas outlet is located at middle box body shape chamber
End face on and connect with die cavity, described First Transition running channel, the second transition running channel and the 3rd transition running channel are located at raising middle flask
The end face of opposite outlets on build chamber.
Sprue sectional area Σ F of the present invention1=28cm2, the cutting of First Transition running channel running channel and the second transition running channel junction
Area Σ F2=58 × 2cm2=116cm2, the sectional area Σ F of the second transition running channel running channel and the 3rd transition running channel junction3=
109×2cm2=218cm2, the sectional area Σ F of ingate4=163 × 2cm2=326cm2, running gate system each unit ratio is (through repairing
Just) take Σ F1: Σ F2: Σ F3: Σ F4=1: 4.1: 7.8: 11.6.
As seen in figures 3-6, middle box body shape chamber of the present invention is axially located in gas outlet opposite side and is provided with first
Core 7, the outer end of the first core are provided with the first core print 7.1；Described middle box body shape chamber is axially located in gas outlet side
It is provided with the second core 8, the outer end of the second core is provided with the second core print 8.1；Set on the described end face in middle box body shape chamber
It is equipped with the 3rd core 9 and the 4th core 10；The structure of this foundry goods is the truncated cone-shaped box typed structure with gusset, adopts altogether in die cavity
With above-mentioned 4 kinds of cores, facilitate retracting of raising middle flask movable block to fix with movable block, the second sand core head external diameter is done little, the first sand
1, core, appearance profile size Φ 760mm × 265mm, weight 150kg；Second core 1, appearance profile size Φ 1160mm ×
285mmmm, weight 300kg；3rd core, the 4th core are for convenience of each 1 of the little core of molding；Using chill furane resins certainly
Hard sand carries out coremaking.
According to the principle of " big flow, low flow velocity, Stable Filling ", in conjunction with box casting construction featuress, running gate system
Using the running gate system of open middle injection, sprue adopts Φ 60mm internal diameter porcelain tube, and ingate is opened in foundry goods intermediate method
At orchid, 2 sectors become 20～30 angles smoothly to enter molten iron with circle major axes orientation, as shown in Figure 1-2, in addition, in foundry goods top surface
Uniform 9 Φ 20mm give vent to anger, exclusion type intracavity gas.
Foundry goods is truncated cone-shaped box typed structure, and wall thickness differs greatly, and the thick position rate of cooling of wall thickness is excessively slow, setting time
Long, easily cause shrinkage cavity and porosity defect.In order to realize Equilibrium Solidification, the thick position of wall thickness properly increases rate of cooling, improves cold
But the method for speed mainly has three kinds, that is,：Plus chill, pressure cooling (as water flowing, mist, liquid nitrogen etc.), chill and pressure cooling phase
Cooperation.Because in 2.3MW wind power generating set, box casting adopts furan resin-sand mold casting, local location rate of cooling is relatively
Slow it is difficult to meet the requirement of quick cooling, consider production cost and to combine physical condition cold using cast iron chill and graphite
Ferrum cools down and to eliminate the bad thermal center effect brought because of wall unevenness, and the thickness of chill takes 0.5～0.8 times of casting section thickness.
As shown in table 1, chill is arranged as Figure 7-8, and described middle box body shape chamber is provided with chill for chill size used and quantity,
Described chill includes the first chill 11, the second chill 12 and the 3rd chill 13；The first described chill is located at middle box body shape chamber
The top surface of first flange on (gas outlet be located end face on), the second described chill is located at middle box body shape chamber second flange
On top surface (middle box body shape chamber is located at the end face within end face that gas outlet is located, and is coaxially disposed with first flange), described the
Three chills are located on the bottom surface of the 3rd flange in middle box body shape chamber (end face in the middle box body shape chamber of the second chill opposite end)；Chill
Thickness take 0.5～0.8 times of the casting section thickness casting section thickness of chill position (specifically place)；The equal lower surface of chill againsts method
Blue face circumference is uniformly distributed, and the first chill is graphite chilling block, and the second chill, the 3rd chill are cast iron chill.
Table 1 chill specification
By production engineering specifications, the sandbox wrapping up die cavity adopts three-cavity moulding, as shown in accompanying drawing 9-10：In three-cavity moulding
Mould is divided into mold 14, lower mould 15, is each attached on template 16, constitutes after the die cavity matched moulds that mold is formed with lower mould
Complete middle box body shape chamber；Make on part casting mold template；Wherein mould 20mm～40mm high strength multi-layer splint construction, type
Plate thickness in monolayer is the underframe with 200mm × 100mm × 10mm thickness square tubes soldering for the high strength multi-layer clamping plate of 20mm～40mm
17 assemble, and the square tube of underframe length direction must be connect with whole root bead, and main purpose is to not make die deformation, improving mould
The overall structure performance of tool, is no less than the high strength multi-layer clamping plate of 80mm in underframe upper berth thickness.Mould will embed in template
10mm is deep, then uses M20 screw and underframe sled jail, to ensure template and mould fixation.
Concrete steps include：
(1) iron liquid carries out double melting using using 18t/h furnace cupola and 5t medium-frequency induction furnace, and charge composition is 50%
～70% pig iron, 20%～40% foundry return, 10%～20% steel scrap；Wherein foundry return is generally the dead head of same material, gives up
Product, are easy to alloy reuse reduces cost, are also beneficial to hot metal composition control；The Composition Control requiring molten iron meets following scope：
C3.80%, Si 2.0%, Mn0.05%, P0.025%, S0.005%, RE (rare earth) 0.015%, Mg 0.030%
Sb0.004%, CE4.47%, balance of ferrum preparation raw material；
(2) method spheroidising is poured using dam-type, dykes and dams height is 100～200mm, nodulizer adds nodularization bag dykes and dams
Behind body of heater side, the granularity plus 0.2% covers on nodulizer for 6mm inovulant, is smash with ferrum fork to put down and smashes tight, nodulizer addition
Amount is about the 1.2% of weight of molten iron；Inovulant, from conventional 75FeSi, for improving pregnant effect, and rationally controls whole silicon amount
According to working condition, using late inoculation processing mode：Add 0.3% inovulant, inovulant granularity 3 with iron liquid stream when tapping a blast furnace
～8mm, there is inoculation(effect) in iron liquid while carrying out spheroidising；Before cast by molten iron when nodularization bag proceeds to casting ladle
The inovulant for 6mm for the granularity of molten iron surface addition 0.25%, as late inoculation, can effectively prevent inoculation fade from improving pregnant
Educate effect；
(3) pouring temperature is too high, and amount of contraction can increase, and is also easy to produce shrinkage cavity and shrinkage porosite；Pouring temperature is too low, at thin-walled
Cold shut defect occurs.For the ease of controlling pouring temperature, iron liquid casting temperature control is at 1330-1350 DEG C.
Produce checking
In actual production process, from high-quality raw material (pig iron, steel scrap)；Using furnace cupola electric furnace double melting, according to
Wall thickness condition, rational designing chemical composition, iron liquid Composition Control before nodularization in the range of technological requirement；From rational nodularization
Inoculation process, casing in the EN-GJS-400-18U-LT of production, its mechanical property, metallographic structure, the size essence of foundry goods
Degree, Non-Destructive Testing have all reached foundry goods acceptance specification (70mm × 105mm × 180mm attached casting test block mechanical property such as table 2, sample
Metallographic structure is as shown in table 3 and Figure 11).
Table 2 attached casting test block mechanical property
Table 3 attached casting test block metallographic structure
Claims (10)
1. the cavity structure of the middle casing of a kind of wind power generating set, this structure includes running gate system, middle box body shape chamber and is located at
Gas outlet on middle box body shape chamber；Described running gate system includes the sprue being sequentially communicated and transition running channel；Described directly pours
Road is used for foundry goods melting iron liquid is incorporated in running gate system, during described transition running channel is used for being incorporated into foundry goods melting iron liquid
Casing die cavity；Ingate is provided with described transition running channel, ingate is connected with middle box body shape chamber.
2. the middle casing of wind power generating set according to claim 1 cavity structure it is characterised in that：Described transition
Running channel includes First Transition running channel, the second transition running channel and the 3rd transition running channel being sequentially communicated；Described First Transition running channel
It is sector for the second cylindrical, described transition running channel, the second transition running channel of described sector is two, is divided into cylinder
The left and right sides of First Transition running channel；The 3rd described transition running channel is circular arc, is connected to the outward flange of the second transition running channel；
The upper surface of the 3rd described transition running channel is ingate, ingate is connected with middle box body shape chamber；Described gas outlet is located at
Connect on the end face in middle box body shape chamber and with die cavity, described First Transition running channel, the second transition running channel and the 3rd transition are poured
Road is located at the side of opposite outlets on middle box body shape chamber.
3. the middle casing of wind power generating set according to claim 2 cavity structure it is characterised in that：Described directly pours
The sectional area in road is Σ F1, the sectional area of First Transition running channel running channel and the second transition running channel junction is Σ F2, the second transition pours
The sectional area of road running channel and the 3rd transition running channel junction is Σ F3, the sectional area of ingate is Σ F4,ΣF1∶ΣF2∶ΣF3∶Σ
F4=1: 4.1: 7.8: 11.6.
4. the middle casing of wind power generating set according to claim 1 cavity structure it is characterised in that：Described raising middle flask
Build chamber is axially located in that gas outlet opposite side is provided with the first core, the outer end of the first core is provided with the first core print；
Described middle box body shape chamber is axially located in that gas outlet side is provided with the second core, the outer end of the second core is provided with the second sand
Core print；It is provided with the 3rd core and the 4th core on the described end face in middle box body shape chamber.
5. the middle casing of wind power generating set according to claim 1 cavity structure it is characterised in that：Described outlet
Gas is 9, Φ 20mm；In on the circumferentially disposed top surface in middle box body shape chamber.
6. the middle casing of wind power generating set according to claim 1 cavity structure it is characterised in that：Described raising middle flask
Chill is provided with build chamber, described chill includes the first chill, the second chill and the 3rd chill；The first described chill position
On the top surface of the first flange in middle box body shape chamber, the second described chill is located on the top surface of middle box body shape chamber second flange,
The 3rd described chill is located on the bottom surface of the 3rd flange in middle box body shape chamber；The thickness of chill picks and places the foundry goods putting chill position
0.5～0.8 times of wall thickness.
7. the middle casing of wind power generating set according to claim 6 cavity structure it is characterised in that：Described first
Chill thickness 60mm, every piece of spacing 35mm, totally 18 pieces；The second described chill thickness 80mm, every piece of spacing 30mm, totally 12 pieces；Described
The 3rd chill thickness 40mm, every piece of spacing 30mm, totally 16 pieces.
8. the method for casing during prepared by a kind of cavity structure of the middle casing of the wind power generating set described in utilization claim 1,
It is characterized in that：Concrete steps include：
(1) first, according to the composition of the middle box casting of following proportioning：C 3.75%～3.80%, Si 1.90%～
2.20%, Mn ＜ 0.20%, P ＜ 0.03%, S ＜ 0.012%, RE0.010%～0.020%, Mg 0.025%～0.040%
Sb0.003%～0.006%, CE4.38%～4.48%, balance of ferrum preparation raw material；
(2) raw material is carried out the double melting of composition adjustment by the melting of furnace cupola and medium-frequency induction furnace；
(3) method spheroidising is poured using dam-type, dykes and dams height is 100～200mm, after nodulizer adds, plus inovulant covers
Cover on nodulizer, nodulizer addition is the 1.0%～1.2% of weight of molten iron；
(4) adopt late inoculation processing mode：The inovulant of iron liquid 0.2-0.4wt% is added with iron liquid stream, iron liquid exists when tapping a blast furnace
Carry out occurring inoculation(effect) while spheroidising；Before cast, molten iron is added on molten iron surface when nodularization bag proceeds to casting ladle
The inovulant of iron liquid 0.2～0.3wt% is as late inoculation；
(5) cavity structure of middle casing is fixed in sandbox；Iron liquid casting temperature control at 1330-1350 DEG C, by iron liquid warp
Cross running gate system and be poured into middle box body shape intracavity, box casting in obtaining after condensation.
9. the method for casing during prepared by the cavity structure of the middle casing of utilization wind power generating set according to claim 8,
It is characterized in that：Described inovulant is 75FeSi, and inovulant granularity is 3～8mm.
10. the method for casing during prepared by the cavity structure of the middle casing of utilization wind power generating set according to claim 8,
It is characterized in that：Described sandbox adopts three-cavity moulding mould, and mould is divided into mold, lower mould, and is each attached to corresponding
On template；Complete middle box body shape chamber is constituted after the die cavity matched moulds of mold and the formation of lower mould；Mould is high with 20mm～40mm
Strength multi-layer splint construction, template thickness in monolayer be 20mm～40mm high strength multi-layer clamping plate and 200mm × 100mm ×
The underframe of 10mm thickness square tubes soldering assembles, and the square tube of underframe length direction connects for whole root bead.
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