CN106424571B - The cavity structure of the middle case of wind power generating set, the method for preparing middle case using the structure - Google Patents
The cavity structure of the middle case of wind power generating set, the method for preparing middle case using the structure Download PDFInfo
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- CN106424571B CN106424571B CN201610871663.XA CN201610871663A CN106424571B CN 106424571 B CN106424571 B CN 106424571B CN 201610871663 A CN201610871663 A CN 201610871663A CN 106424571 B CN106424571 B CN 106424571B
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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
A kind of cavity structure of the middle case of wind power generating set, the method for preparing middle case using the structure, which includes running gate system, middle case cavity and gas outlet；The running gate system includes the sprue being sequentially communicated and transition running channel；The sprue is used to casting melting iron liquid being introduced into running gate system, and the transition running channel is used to casting melting iron liquid being introduced into middle case cavity；Ingate is provided on the transition running channel, ingate is connected with middle case cavity.It is avoided that heavy turbulence, prevents from being involved in, absorbs gas and make the casting flaws such as metal excessive oxidation, and have the advantages that temperature resistant range is wide, intensity is high, the requirement of EN12680.3 and DINEN1369 standards can be met.
Description
Technical field
The invention belongs to the middle case casting technology fields of wind power generating set, and in particular to a kind of wind power generating set
The cavity structure of middle case, the method for preparing middle case using the structure.
Background technology
Wind energy is a kind of clean regenerative resource, by the most attention of countries in the world.Preceding babinet, rear box, raising middle flask
Key components and parts of the nodular iron castings such as body, planet carrier as gearbox of wind turbine, throughout the year at up to tens meters to more than 100
The high dry running of rice, most of casting will be on active service 20 years under -20 DEG C even -40 DEG C of environment, and integrated performance index is more demanding.
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 2200 hours 1.5MW units, occurs a gear-box significant trouble, only gear box arrangement take 1,000,000 it
Between, such as plus lifting cost, traffic expense, labour cost estimation 200,000 or so, every restoration costs summation will be 1,300,000 or so.
Middle case especially therein, plays crucial connection function, and the presence of casting flaw will seriously affect use
Effect.Such as with casting outer profile size Φ 1910mm × Φ 1297mm × 395mm, for the middle case of net weight 1200kg：It 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×
The attached casting test block mechanical properties of 105mm × 180mm meet the regulation of Client Enterprise standard, tensile strength >=360MPa, yield strength
>=220MPa, elongation percentage >=12%, it is desirable that the ballistic work individual sample of -20 DEG C of Xia Shi V-notch is not less than 7J, three samples
Average value be not less than 10J；(2) the attached casting test block metallographic structures of 70mm × 105mm × 180mm meet Client Enterprise (ISO 945)
The regulation of standard, ferrite >=90%, pearlite≤10%, cementite≤1%, Oxygen potential >=90%, graphite size 4~7；
(3) 1 grade in EN12680.3 and DINEN1369 standards must be met through 100% ultrasonic wave and magnetic powder inspection, key position
It is required that 2 grades of other positions.
Therefore, cast the middle case of this big size, occur when overcoming such as iron liquid stamp heavy turbulence, be involved in,
Or suck gas and make the casting flaws such as metal excessive oxidation, and above-mentioned requirement can be met, it is that this field is urgently to be resolved hurrily
The technical issues of.
Invention content
The present invention is directed to the above-mentioned deficiency of the prior art, provides one kind and being avoided that heavy turbulence, prevents from being involved in, sucks gas
With make the casting flaws such as metal excessive oxidation, and with temperature resistant range is wide, intensity is high, can meet EN12680.3 and DINEN1369
The cavity structure of the middle case for the wind power generating set that standard requires.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of middle case of wind power generating set
Cavity structure, which includes running gate system, middle case cavity and the gas outlet on middle case cavity；The cast
System includes the sprue being sequentially communicated and transition running channel；The sprue is used to casting melting iron liquid being introduced into cast system
In system, the transition running channel is used to casting melting iron liquid being introduced into middle case cavity；It is provided on the transition running channel
Ingate, ingate are connected with middle case cavity.
Preferably, the transition running channel includes the First Transition running channel being sequentially communicated, the second transition running channel and third
Transition running channel；The First Transition running channel is cylindrical, the second transition running channel is sector, fan-shaped second
Transition running channel is two, is divided into the left and right sides of cylindrical First Transition running channel；The third transition running channel be it is arc-shaped,
It is connected to the outer edge of the second transition running channel；The upper surface of the third transition running channel is ingate, ingate and middle case
Cavity is connected；The gas outlet is located on the end face of middle case cavity and is connected to cavity, and the First Transition pours
Road, the second transition running channel and third transition running channel are located at the side of opposite outlets on middle case cavity.
Using the above structure, the Stable Filling of iron liquid, First Transition running channel, the second transition running channel, third transition are realized
The setting of running channel, main function are to avoid heavy turbulence for iron liquid Stable Filling, prevent from being involved in, suck gas and make gold
Belong to excessive oxidation.
Preferably, the sectional area of the sprue is Σ F1, First Transition running channel running channel and the second transition running channel connect
The sectional area for meeting place is Σ F2, the sectional area of the second transition running channel running channel and third 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 the above structure, iron liquid is further ensured
Stable Filling avoids heavy turbulence, prevents from being involved in, suck gas and making metal excessive oxidation；Moreover, make iron liquid casting process and
Early solidification be in higher ferrostatic pressure effect under, with using molten iron rear benefit amount and adjacent area graphitization expansion into
It goes from feeding.
Preferably, the middle case cavity, which is axially located in gas outlet opposite side, is provided with the first sand core, first
The outer end of sand core is provided with the first core print；The middle case cavity is axially located in gas outlet side and is provided with the second sand
Core, the second sand core outer end be provided with the second core print；Third sand core and are provided on the end face of the middle case cavity
Four sand cores；The structure of this casting is the truncated cone-shaped box typed structure with gusset, and above-mentioned 4 kinds of sand cores are used altogether in cavity.
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
In on the top surface of middle case cavity；The defects of above structure is for excluding type intracavity gas, ensureing pore-free in casting.
Preferably, being provided with chill on the middle case cavity, the chill includes the first chill, the second chill
With third chill；First chill is located at the (end face where gas outlet on the top surface of the first flange of middle case cavity
On), second chill is located on the top surface of middle case cavity second flange that (middle case cavity is located at the end where gas outlet
End face inside face is coaxially disposed with first flange), the third chill is located at the bottom surface of the third flange of middle case cavity
Upper (end face of the middle case cavity 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 chills are circumferentially uniformly distributed on respective flange face.Due to middle case casting
For box typed structure, wall thickness differs greatly, and the position cooling velocity of wall thickness thickness is excessively slow, setting time is long, easily causes shrinkage cavity and porosity
The defects of；In order to realize that Equilibrium Solidification, the position of wall thickness thickness properly increase cooling velocity, the method for improving cooling velocity mainly has
Three kinds, i.e.,：Add chill, force cooling (such as water flowing, mist, liquid nitrogen), chill and cooling is forced to match；Due to 2.3MW wind-force
Generating set middle case casting uses furan resin-sand mold casting, local location cooling velocity slower, it is difficult to which satisfaction is quickly cooled down
Requirement, consider production cost and eliminated because of wall thickness not using cast iron chill and graphite chilling block cooling in conjunction with physical condition
The bad thermal center effect brought.
Preferably, described first chill thickness 60mm, every piece of spacing 35mm, totally 18 pieces；Second chill is thick
80mm, every piece of spacing 30mm, totally 12 pieces；Described third chill thickness 40mm, every piece of spacing 30mm, totally 16 pieces.
The present invention middle case cavity can also be considered as final middle case casting shape namely middle case raw material melting
Final middle case casting is formd after the accommodating hungry cavity of iron liquid, iron liquid cooling.
A method of preparing middle case, specific steps packet using the cavity structure of the middle case of above-mentioned wind power generating set
It includes：
(1) first, according to the ingredient of the middle case casting matched as follows：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%, surplus are iron preparation raw material；
(2) raw material is subjected to the double melting of composition adjustment by the melting of furnace cupola and medium-frequency induction furnace (furnace charge is matched
Than for 50%~70% pig iron, 20%~40% foundry return, 10%~20% steel scrap, wherein foundry return is generally pouring for same material
Riser, waste product reduce cost convenient for alloy reuse, are also beneficial to hot metal composition control)；
(3) method spheroidising is poured using dam-type, dykes and dams height is 100~200mm, and nodularization packet dykes and dams are added in nodulizer
Behind furnace body side, inovulant is added to be covered on nodulizer, nodulizer addition is the 1.0%~1.2% of weight of molten iron；
(4) late inoculation processing mode is used：The inovulant of iron liquid 0.2-0.4wt% is added when tapping a blast furnace with iron liquid stream, it is pregnant
Agent 3~8mm of granularity is educated, inoculation(effect) occurs while carrying out spheroidising for iron liquid, and (i.e. above-mentioned steps (3) are in nodulizer overlying
The inovulant of lid)；It is added 0.2~0.3wt%'s of iron liquid on molten iron surface when molten iron being transferred to casting ladle from nodularization packet before cast
Granularity is the inovulant of 3~8mm as late inoculation；
(5) cavity structure of middle case is fixed in sandbox；Iron liquid casting temperature is controlled at 1330-1350 DEG C, by iron
Liquid is poured by running gate system in middle case cavity, and middle case casting is obtained after condensation.
The above-mentioned inovulant of the present invention selects 75FeSi, to improve pregnant effect, and rationally controls whole silicon amount according to production
Condition can effectively prevent inoculation fade to improve pregnant effect using late inoculation processing mode.
The setting of pouring temperature of the present invention be because：Pouring temperature is excessively high, and shrinkage can increase, and be also easy to produce shrinkage cavity and contracting
Pine；Pouring temperature is too low, and cold shut defect is also will appear at thin-walled；For the ease of controlling pouring temperature, the control of iron liquid casting temperature
At 1330-1350 DEG C.
The above-mentioned sandbox of the present invention uses three-cavity moulding, and the mold in three-cavity moulding is divided into upper mold, lower mold and solid
It is scheduled on corresponding template and (is made on the casting mold template of part), constituted after the cavity molding that upper mold and lower mold are formed complete
Middle case cavity；Mold 20mm~40mm high strength multi-layer splint constructions, template 20mm~40mm high strength multi-layer clamping plates
Assemble with the bottom frame of 200mm × 100mm × 10mm thickness square tubes solderings, the square tube of bottom frame length direction must use whole root bead
It connects；Main purpose is that the overall structure performance of mold is improved in order not to make die deformation, and on bottom frame upper berth, thickness is no less than 80mm
High strength multi-layer clamping plate.It is deep that mold will be embedded in template 10mm, then uses M20 screws and bottom frame sled jail, with ensure template with
Mold fixation.
Description of the drawings
The cavity structure schematic diagram of the middle case of Fig. 1 wind power generating sets of the present invention.
Injection system structure schematic diagram in the cavity structure of the middle case of Fig. 2 wind power generating sets of the present invention.
First sand core structure schematic diagram in the cavity structure of the middle case of Fig. 3 wind power generating sets of the present invention.
Second sand core structure schematic diagram in the cavity structure of the middle case of Fig. 4 wind power generating sets of the present invention.
The middle case cavity structure provided with sand core shows in the cavity structure of the middle case of Fig. 5 wind power generating sets of the present invention
It is intended to (second and third, four sand cores visible).
The middle case cavity structure provided with sand core shows in the cavity structure of the middle case of Fig. 6 wind power generating sets of the present invention
It is intended to (the first sand core is visible).
The middle case cavity structure provided with chill shows in the cavity structure of the middle case of Fig. 7 wind power generating sets of the present invention
It is intended to (the first and second chill is visible).
The middle case cavity structure provided with chill shows in the cavity structure of the middle case of Fig. 8 wind power generating sets of the present invention
It is intended to (third chill is visible).
The upper die structure schematic diagram that the cavity structure of the middle case of Fig. 9 wind power generating sets of the present invention uses.
The lower die structure schematic diagram that the cavity structure of the middle case of Figure 10 wind power generating sets of the present invention uses.
Casting sample metallographic structure figure prepared by Figure 11 embodiment of the present invention.
Specific implementation mode
The present invention is described in further detail below by attached drawing, but the present invention is not limited solely to following embodiment.
Embodiment
With casting outer profile size Φ 1910mm × Φ 1297mm × 395mm, net weight 1200kg, castings material EN-GJS-
400-18U-LT, which is the truncated cone-shaped box typed structure of wall thickness 25mm, for thickest 122mm.
As a kind of embodiment of specific embodiment, as shown in attached drawing 1-2：A kind of middle case of wind power generating set of the present invention
Cavity structure, which includes running gate system 1, middle case cavity 2 and gas outlet 3, and gas outlet is located on middle case cavity；Institute
The running gate system stated includes the sprue 4 (being similar to L-type) being sequentially communicated and transition running channel 5；The transition running channel includes the
One transition running channel 5.1, the second transition running channel 5.2 and third transition running channel 5.3；The First Transition running channel is cylindrical, institute
The the second transition running channel stated is sector, and described the second fan-shaped transition running channel, which is two, is divided into cylindrical First Transition pours
The left and right sides in road；The third transition running channel is outer edge that is arc-shaped, being connected to the second transition running channel；The third
The upper surface of transition running channel is ingate 6, ingate is connected with middle case cavity；The gas outlet is located at middle case cavity
End face on and be connected to cavity, the First Transition running channel, the second transition running channel and third 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, section 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 third 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 case cavity of the present invention is axially located in gas outlet opposite side and is provided with first
Sand core 7, the first sand core outer end be provided with the first core print 7.1；The middle case cavity is axially located in gas outlet side
It is provided with the second sand core 8, the outer end of the second sand core is provided with the second core print 8.1；It is set on the end face of the middle case cavity
It is equipped with third sand core 9 and the 4th sand core 10；The structure of this casting is the truncated cone-shaped box typed structure with gusset, is adopted altogether in cavity
With above-mentioned 4 kinds of sand cores, retracting for raising middle flask movable block is facilitated to be fixed with movable block, the second sand core head outer diameter is done into small, the first sand
1, core, appearance profile size Φ 760mm × 265mm, weight 150kg；Second sand core 1, appearance profile size Φ 1160mm ×
285mmmm, weight 300kg；Third sand core, the 4th sand core are for convenience of each 1 of the small sand core of molding；Certainly using chill furane resins
Hard sand carries out coremaking.
According to the principle of " big flow, low flow velocity, Stable Filling ", in conjunction with the design feature of middle case casting, running gate system
Using the open intermediate running gate system injected, sprue uses Φ 60mm internal diameter porcelain tubes, ingate to be opened in casting intermediate method
At orchid, 2 sectors justify together major axes orientation into 20~30 angles smoothly into molten iron, as shown in Figs. 1-2, in addition, in casting top surface
Uniformly distributed 9 Φ 20mm outlets, exclusion type intracavity gas.
Casting is truncated cone-shaped box typed structure, and wall thickness differs greatly, and the position cooling velocity of wall thickness thickness is excessively slow, setting time
It is long, easily cause shrinkage cavity and porosity defect.In order to realize that Equilibrium Solidification, the position of wall thickness thickness properly increase cooling velocity, improve cold
But there are mainly three types of the methods of speed, i.e.,：Add chill, force cooling (such as water flowing, mist, liquid nitrogen), chill and force cooling phase
Cooperation.Due to 2.3MW wind power generating set middle case casting use furan resin-sand mold casting, local location cooling velocity compared with
Slowly, it is difficult to meet the requirement being quickly cooled down, consider production cost and combine physical condition cold using cast iron chill and graphite
Iron cools down to eliminate the bad thermal center effect brought by wall unevenness, and the thickness of chill takes 0.5~0.8 times of casting section thickness.
Chill size and quantity used are as shown in table 1, and chill arrangement is as Figure 7-8, and chill is provided on the middle case cavity,
The chill includes the first chill 11, the second chill 12 and third chill 13；First chill is located at middle case cavity
First flange top surface on (on the end face where gas outlet), second chill is located at middle case cavity second flange
On top surface (middle case cavity is located at the end face inside the end face where gas outlet, is coaxially disposed with first flange), described the
Three chills are located on the bottom surface of the third flange of middle case cavity (end face of the middle case cavity of the second chill opposite end)；Chill
Thickness take 0.5~0.8 times of casting section thickness (casting section thickness for specifically placing chill position)；The equal lower face of chill is close to method
Blue face is circumferentially uniformly distributed, and the first chill is graphite chilling block, and the second chill, third chill are cast iron chill.
1 chill specification of table
By production engineering specifications, the sandbox for wrapping up cavity uses three-cavity moulding, as shown in attached drawing 9-10：In three-cavity moulding
Mold is divided into upper mold 14, lower mold 15, is each attached on template 16, is constituted after the cavity molding that upper mold is formed with lower mold
Complete middle case cavity；It is made on the casting mold template of part；Wherein mold 20mm~40mm high strength multi-layer splint constructions, type
The bottom frame for the high strength multi-layer clamping plate and 200mm × 100mm × 10mm thickness square tubes solderings that plate is 20mm~40mm with thickness in monolayer
17 assemble, and the square tube of bottom frame length direction must be connect with whole root bead, and main purpose is to improve mould in order not to make die deformation
The overall structure performance of tool, on bottom frame upper berth, thickness is no less than the high strength multi-layer clamping plate of 80mm.Mold will be embedded in template
10mm is deep, M20 screws and bottom frame sled jail is then used, to ensure template and mold fixation.
Specific steps include：
(1) iron liquid is used carries out double melting, charge composition 50% using 18t/h furnace cupolas and 5t medium-frequency induction furnaces
~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 reduce cost convenient for alloy reuse, are also beneficial to hot metal composition control；It is required that the Composition Control of molten iron meets following range：
C3.80%, Si 2.0%, Mn0.05%, P0.025%, S0.005%, RE (rare earth) 0.015%, Mg 0.030%
Sb0.004%, CE4.47%, surplus are iron preparation raw material；
(2) method spheroidising is poured using dam-type, dykes and dams height is 100~200mm, and nodularization packet dykes and dams are added in nodulizer
Behind furnace body side, the granularity for adding 0.2% is that 6mm inovulants are covered on nodulizer, is smash to put down with iron fork and smashes tight, nodulizer addition
Amount is about the 1.2% of weight of molten iron；Inovulant selects common 75FeSi, to improve pregnant effect, and rationally controls whole silicon amount
According to working condition, using late inoculation processing mode：With the inovulant of iron liquid stream addition 0.3%, inovulant granularity 3 when tapping a blast furnace
While carrying out spheroidising inoculation(effect) occurs for~8mm, iron liquid；When molten iron being transferred to casting ladle from nodularization packet before cast
The inovulant that the granularity that molten iron surface is added 0.25% is 6mm can effectively prevent inoculation fade to improve pregnant as late inoculation
Educate effect；
(3) pouring temperature is excessively high, and shrinkage can increase, and be also easy to produce shrinkage cavity and shrinkage porosite；Pouring temperature is too low, at thin-walled
It will appear cold shut defect.For the ease of controlling pouring temperature, iron liquid casting temperature is controlled at 1330-1350 DEG C.
Production verification
In actual production process, high-quality raw material (pig iron, steel scrap) is selected；Using furnace cupola electric furnace double melting, according to
Wall thickness condition, rational designing chemical composition, before nodularization within the scope of iron liquid Composition Control to technological requirement；Select rational nodularization
Inoculation process, the EN-GJS-400-18U-LT middle cases of production, mechanical property, metallographic structure, the size of casting are smart
Degree, non-destructive testing have all reached casting acceptance specification (the attached casting test block mechanical properties of 70mm × 105mm × 180mm such as table 2, sample
Metallographic structure is as shown in table 3 and Figure 11).
2 attached casting test block mechanical property of table
3 attached casting test block metallographic structure of table
Claims (4)
1. a kind of cavity structure of the middle case of wind power generating set, which includes running gate system, middle case cavity and is located at
Gas outlet on middle case cavity；The running gate system includes the sprue being sequentially communicated and transition running channel；Described directly pours
Road is used to casting melting iron liquid being introduced into running gate system, during the transition running channel is used to casting melting iron liquid being introduced into
Babinet cavity；Ingate is provided on the transition running channel, ingate is connected with middle case cavity；The transition running channel
Including the First Transition running channel, the second transition running channel and third transition running channel being sequentially communicated；The First Transition running channel is circle
Cylindricality, the second transition running channel are sector, and the second fan-shaped transition running channel is two, is divided into cylinder first
The left and right sides of transition running channel；The third transition running channel is outer edge that is arc-shaped, being connected to the second transition running channel；Institute
The upper surface for the third transition running channel stated is ingate, ingate is connected with middle case cavity；During the gas outlet is located at
It is connected on the end face of babinet cavity and with cavity, the First Transition running channel, the second transition running channel and third transition running channel
The side of opposite outlets on middle case cavity；
Chill is provided on the middle case cavity, the chill includes the first chill, the second chill and third chill；
First chill is located on the top surface of the first flange of middle case cavity, and second chill is located at middle case cavity
On the top surface of second flange, the third chill is located on the bottom surface of the third flange of middle case cavity；The thickness of chill takes
Place the casting section thickness at chill position 0.5~0.8 times；
The sectional area of the sprue is Σ F 1, the sectional area of First Transition running channel running channel and the second transition running channel junction
For Σ F 2, the second transition running channel running channel and the sectional area of third transition running channel junction are Σ F 3, and the sectional area of ingate is
2: Σ F of Σ F 4, Σ 1: Σ F of F, 3: Σ F 4=1: 4.1: 7.8: 11.6.
2. the cavity structure of the middle case of wind power generating set according to claim 1, it is characterised in that：The raising middle flask
Build chamber is axially located in that gas outlet opposite side is provided with the first sand core, the outer end of the first sand core is provided with the first core print；
The middle case cavity is axially located in that gas outlet side is provided with the second sand core, the outer end of the second sand core is provided with the second sand
Core print；It is provided with third sand core and the 4th sand core on the end face of the middle case cavity.
3. the cavity structure of the middle case of wind power generating set according to claim 1, it is characterised in that：The outlet
Gas is 9, Φ 20mm；In circumferentially disposed on the top surface of middle case cavity.
4. the cavity structure of the middle case of wind power generating set according to claim 1, it is characterised in that：Described first
Chill thickness 60mm, every piece of spacing 35mm, totally 18 pieces；Described second chill thickness 80mm, every piece of spacing 30mm, totally 12 pieces；It is described
Third chill thickness 40mm, every piece of spacing 30mm, totally 16 pieces.
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| CN107245640B (en) * | 2017-06-15 | 2018-08-31 | 甘肃酒钢集团西部重工股份有限公司 | A kind of preparation method and running gate system of wind-powered electricity generation taper spindle |
| CN108436039B (en) * | 2018-05-31 | 2023-11-24 | 天津蒙德利尔集装箱配件有限公司 | Container corner fitting casting mould for technology |
| CN109940128B (en) * | 2019-04-29 | 2020-10-23 | 湖南诚今电梯部件制造有限公司 | Resin sand ductile iron casting mould without riser |
| CN115041634B (en) * | 2022-03-27 | 2023-07-18 | 宁波拓铁机械有限公司 | Casting method of wind power planet carrier casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4089364A (en) * | 1976-11-22 | 1978-05-16 | United Technologies Corporation | Mold having integral preformed gating system |
| JP2002339034A (en) * | 2001-05-17 | 2002-11-27 | Harachuu:Kk | Heat resistant spheroidal graphite cast iron |
| CN201482931U (en) * | 2009-07-25 | 2010-05-26 | 日月重工股份有限公司 | Pouring device for rotating shaft cast of wind driven generator |
| CN101618425B (en) * | 2009-07-25 | 2011-07-13 | 日月重工股份有限公司 | Method for casting rotary axis casts of aerogenerators |
| CN102248132A (en) * | 2011-05-30 | 2011-11-23 | 日月重工股份有限公司 | Method for casting large stamping cylinder casting |
| CN205020753U (en) * | 2015-09-29 | 2016-02-10 | 日月重工股份有限公司 | Wind generating set box foundry goods pouring structure |
| CN204934512U (en) * | 2015-09-29 | 2016-01-06 | 日月重工股份有限公司 | The pouring gate structure of wind power generator group toggle casting moulding system |
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