CN105127372B - A kind of Feeder Design method of big wall thickness semi-circular inner casing casting - Google Patents
A kind of Feeder Design method of big wall thickness semi-circular inner casing casting Download PDFInfo
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Abstract
The present invention relates to casting technology field, more particularly to a kind of Feeder Design method of big wall thickness semi-circular inner casing casting, in the Feeder Design method of the present invention, it is bigger according to the modulus at different die cavity positions in the design feature and casting process of big wall thickness semi-circular inner casing casting, the longer principle of the setting time of molten steel, rising head is arranged to wrap to the whole semi arch inner chamber of casting, and rising head is provided enough molten steel feeding amounts so that whole casting casing wall becomes end region during solidification（First solidification zone）, the shrinkage porosite problem that the casing wall center caused by common process method that eliminates is produced by set retardation；And whole rising head is vertically upward, and gas being involved in the oxide, slag inclusion and casting process in molten steel etc. can be floated to directly in rising head, reduce the risk that casting has slag inclusion, stomata in itself.
Description
Technical field
The present invention relates to casting technology field, more particularly to a kind of Feeder Design side of big wall thickness semi-circular inner casing casting
Method.
Background technology
High-pressure inner cylinder casting for nuclear power generating sets is a kind of big wall thickness inner casing steel-casting, and the inside and outside chamber of the casting is revolution
The half cylindrical structure of formation, as shown in figure 1, wherein the thickest of flange face reach more than 330mm, casing wall wall thickness 220 ~
250mm.The Feeder Design of former casting technique places cold as shown in Fig. 2 being set in the middle of flange face and inner chamber between rising head, rising head
Iron subregion, each subregion of each rising head correspondence carries out feeding.The follow conventional lines casting technique of cylinder part of the technique is designed, and is not had
There is the design feature in view of the casting big wall thickness in itself, therefore there is many shrinkage defects in casting.The casing wall of conventional cylinder part
Chill subregion, because wall ratio is relatively thin, chill are used between open riser and inner chamber blind riser on 60mm ~ 100mm, flange
Substantially, casing wall can solidify chilling action in a short time, and open riser can distinguish feeding each region with blind riser, eliminate casting
Part shrinkage porosite.And the casting section thickness of this product, in 220 ~ 250mm, more than conventional cylinder part, during using chill subregion, chilling action is not
Substantially, when causing casting solidification, the casing wall at chill position does not solidify in time, and the molten steel in open riser is under gravity to whole
Molten steel is not enough in individual feeding a casting, open riser, causes faying face shrinkage porosite and dreg defect serious, meanwhile, the center solidification of casing wall
In evening time, casting casting section thickness center is caused shrinkage porosite occur.
The content of the invention
There is provided one for the problem of present invention exists for Feeder Design in big wall thickness inner casing cast casting technique in the prior art
Plant a kind of Feeder Design method for the big wall thickness semi-circular inner casing casting that can avoid wall thickness direction shrinkage porosite.
The object of the present invention is achieved like this, a kind of Feeder Design method of big wall thickness semi-circular inner casing casting, and it is special
Levy and be, successively including following process：
1）According to the structure of semi-circular inner casing casting, semi-circular inner casing casting is divided vertically to calculate different portions
Some sections of position modulus, and each segment mark is designated as one~section of section n successively；
2）Calculate each section of modulus at the beginning from section, the wall thickness by section one along each segmental arc position of semi-circular circumference is different, will
Section one is further divided into the different segmental arcs for being easy to modulus calculation, and each section of modulus is designated as M11~M1m respectively, and takes each section of modulus
Maximum M0, be calculated as M0=Max（M11~M1m）；
3）According to the result of calculation of each segmental arc modulus in upper step stage casing 1, designed vertically upward in the semicircular arc inner chamber of section one
Rising head one, the rising head one is the semi-cylindrical rising head matched with inner cavity cambered surface, and the modulus of the rising head one is set to M1, takes
M1 >=1.2M0 is calculated as formula 1；
The theoretical modulus of semi-cylindrical rising head is：M posts=V/S=π Rd/ [2 (π R+ π d+2d)] are calculated as formula 2
Wherein, V is the volume of semicolumn, and S is the surface area of semicolumn, i.e. R is in the radius casting of semicolumn
The radius of chamber cambered surface, d is the thickness for emitting opening's edge semicolumn axial direction;
To extend the setting time of rising head, heat-insulation layer is set in the outside for emitting opening's edge semicolumn end face, the heat-insulation layer
Heat insulating coefficient K is 1.3~1.4, and now the actual modulus of rising head one is that M1=KM posts are calculated as formula 3, and formula 2 is substituted into public affairs
Formula 3 is obtained：M1=K π Rd/ [2 (π R+ π d+2d)], are calculated as formula 4, then formula 4 are substituted into formula 1 obtaining the thickness d of rising head one
Minimum value dmin, d actual value is by 1~1.1 times of dminMeter, so that it is determined that the size of rising head one；
4）Rising head two is set at the top of rising head one, to provide the feeding liquid of casting die cavity and rising head one, the length of rising head two
Spend for 2R, width is d, is highly H, the two ends of the width of rising head two are semi-cylindrical, and the feeding liquid measure m of the rising head two is big
In section one and total molten steel amount m of rising head one1, m determines as the following formula：m=1.353*[（14-ε）/ ε] * v* ρ are calculated as formula 5, wherein singly
Position is kg；ε-body shrinkage factor, the value of molten steel is based on 5；ρ-molten steel density, takes 7.83t/m3, the volume of v-rising head two；Emit
The volume v of mouth two=（2Rd-0.215d2）H*10-6, unit is m3, be calculated as formula 6, formula 6 substituted into formula 5, obtain m=
34.67*（2Rd-0.215d2）H*10-6＞ m1, convert and draw H ＞ 106 m1/(69.34Rd-7.45d2), formula 7 is calculated as, this formula
Middle m can be calculated according to section one and rising head one and obtained, so that it is determined that H minimum value Hmin, the actual height of the rising head two is 1
~1.1 times of Hmin；
5）Repeat step 2）~4）Separately design the rising head parameter for calculating two~section of section n.
The mould at different die cavity positions in design feature and casting process of the present invention according to big wall thickness semi-circular inner casing casting
Number is bigger, the longer principle of the setting time of molten steel, rising head is arranged to wrap to the whole semi arch inner chamber of casting, and make to emit
Mouth provides enough molten steel feeding amounts so that whole casting casing wall becomes end region during solidification（First solidification zone）, eliminate
The shrinkage porosite problem that casing wall center is produced by set retardation caused by common process method；And whole rising head is vertically upward, steel
Gas being involved in oxide, slag inclusion and casting process in water etc. can be floated to directly in rising head, reduce casting sheet
There is the risk of slag inclusion, stomata in body.
For the setting time of further extension rising head, the outside of the rising head two is also provided with being incubated with the identical of rising head one
Layer.
For ease of the excision at rising head position after cast, curved edge and the core cavity cambered surface of the heat-insulation layer of the rising head one
Gap provided with 40~50mm.
Brief description of the drawings
Fig. 1 is big wall thickness semi-circular inner casing casting structure schematic diagram.
The Feeder Design artwork of Fig. 2 big wall thickness semi-circular inner casing casting in the prior art.
Fig. 3 is the stepwise schematic views in big wall thickness semi-circular inner casing casting pressing port design technology in embodiments of the invention.
Fig. 4 is segmental arc schematic diagram of the one of segmentation of inner casing casting by different modulus different demarcations.
Fig. 5 is the dead head structure schematic diagram of the one of segmentation of inner casing casting.
Fig. 6 is the dead head structure schematic diagram of whole big wall thickness semi-circular inner casing casting.
Embodiment
It is the involved big wall thickness semi-circular inner casing casting structure schematic diagram of the present embodiment as shown in Figure 1, wherein, casing wall
Thick D=22.4cm, casing wall internal diameter R=93cm, the central cross-section of inner casing cast product along its length generally symmetrical configuration point
Cloth, therefore when designing rising head in the present inventive method, only need to design half therein, second half is then symmetrical arranged again,
Half therein, is divided into 22 two sections of section 1 and section, as shown in Figure 3.When calculating 22 modulus of section 1 and section, section 1 is first calculated
Modulus, as shown in figure 4, section 1 is divided into the arc at the segmental arc one near flange port, uniform wall thickness by structure and Thickness Distribution
Section two and the segmental arc 3 of arc length middle part, calculate modulus M11, M12, the M13 of each segmental arc, and take M0=Max respectively（M11,
M12, M13）；Rising head 1 vertically upward is designed in the semicircular arc inner chamber of section 1 accordingly, rising head 1 is and inner cavity cambered surface phase
The semi-cylindrical rising head matched somebody with somebody, to make the delay solidification of rising head 1, takes modulus M1 >=1.2M0 of rising head 1, semi-cylindrical rising head
One theoretical modulus calculation value is M posts=V/S=π Rd/ [2 (π R+ π d+2d)], and insulation is set in the outside of semicolumn rising head 1
COEFFICIENT K is 1.35 heat-insulation layer 5, therefore, and the actual modulus of rising head 1 is M1=1.35M posts, and by above-mentioned calculating M1 >=
1.2M0, it may be determined that the minimum value of thickness d of the rising head 1 along semicolumn axial direction is dmin=3.768RM0/（2.119R-
6.168M0）, d is actual to press 1~1.1 times of dminValue, may thereby determine that the size of rising head 1.Set again on the top of rising head 1
The rising head 24 of the molten steel amount for feeding casting die cavity and rising head 1 is put, the length of rising head 24 is 2 R, and width is d, height
For H, the two ends of the width of rising head 24 are the semi-cylindrical that radius is d/2, and can be with according to formula 5, formula 6 and formula 7
Determine the minimum height values H of rising head 24min, H is actual to press 1-1.1 times of HminValue, equally sets in the outside of rising head 24 and protects
Warm system is 1.35 heat-insulation layer 5, to extend the setting time of rising head 24；Simultaneously in view of being convenient to clean emitting oral area after cast
Position, the curved edge of the heat-insulation layer 5 of the outer layer of rising head 1 is provided with 40~50mm gap with core cavity cambered surface.Thus complete
The dead head structure and parameter and design of the inner chamber of section one, as shown in figure 5, design calculates the knot of section two rising head as stated above again
Structure and parameter, so that the rising head scheme for completing the present embodiment casting cylinder part half is set, as shown in fig. 6, being finally symmetrical arranged casting cylinder
The Feeder Design of second half inner chamber of part.
Through productive experiment, the inside for the big wall thickness semi-circular inner casing casting finally poured into a mould using Feeder Design method of the present invention
Quality uses ultrasound examination（UT）, detection rank is UT2 grades, and each part of casting is not above detecting the defect of rank, explanation
The type rising head can effectively solve shrinkage porosite, slag inclusion and gas hole defect.
Claims (3)
1. a kind of Feeder Design method of big wall thickness semi-circular inner casing casting, it is characterised in that successively including following process：
1）According to the structure of semi-circular inner casing casting, semi-circular inner casing casting is divided vertically to calculate different parts mould
Several some sections, and each segment mark is designated as one~section of section n successively；
2）Calculate each section of modulus at the beginning from section, the wall thickness by section one along each segmental arc position of semi-circular circumference is different, by section one
The different segmental arcs for being easy to modulus calculation are further divided into, each section of modulus is designated as M11~M1m respectively, and takes each section of modulus most
Big value M0, is calculated as M0=Max（M11~M1m）；
3）According to the result of calculation of each segmental arc modulus in upper step stage casing one, in semicircular arc inner chamber design the emitting vertically upward of section one
Mouthful one, the rising head one is the semi-cylindrical rising head matched with inner cavity cambered surface, and the modulus of the rising head one is set to M1, take M1 >=
1.2M0 it is calculated as formula 1；
The theoretical modulus of semi-cylindrical rising head is：M posts=V/S=π Rd/ [2 (π R+ π d+2d)] are calculated as formula 2,
Wherein, V is the volume of semicolumn, and S is the surface area of semicolumn, i.e. the radius core cavity arc that R is semicolumn
The radius in face, d is the thickness for emitting opening's edge semicolumn axial direction；
To extend the setting time of rising head, heat-insulation layer, the insulation of the heat-insulation layer are set in the outside for emitting opening's edge semicolumn end face
COEFFICIENT K is 1.3~1.4, and now the actual modulus of rising head one is that M1=KM posts are calculated as formula 3, and formula 2 is substituted into formula 3
Obtain：M1=K π Rd/ [2 (π R+ π d+2d)], are calculated as formula 4, then formula 4 are substituted into formula 1 obtaining the thickness d of rising head one most
Small value dmin, d actual value is by 1~1.1 times of dminMeter, so that it is determined that the size of rising head one；
4）Rising head two is set at the top of rising head one, to provide the feeding liquid of casting die cavity and rising head one, the length of rising head two is
2R, width is d, is highly H, and the two ends of the width of rising head two are semi-cylindrical, and the feeding liquid measure m of the rising head two is more than section
One and total molten steel amount m of rising head one1, m determines as the following formula：m=1.353*[（14-ε）/ ε] * v* ρ are calculated as formula 5, and wherein unit is
kg；ε-body shrinkage factor, the value of molten steel is based on 5；ρ-molten steel density, takes 7.83t/m3, the volume of v-rising head two；Rising head two
Volume v=（2Rd-0.215d2）H*10-6, unit is m3, formula 6 is calculated as, formula 6 is substituted into formula 5, m=34.67* is obtained
（2Rd-0.215d2）H*10-6＞ m1, convert and draw H ＞ 106 m1/(69.34Rd-7.45d2), formula 7 is calculated as, m can in this formula
Obtained with being calculated according to section one and rising head one, so that it is determined that H minimum value Hmin, the actual height of the rising head two is 1~1.1
Times Hmin；
5）Repeat step 2）~4）Separately design the rising head for calculating two~section of section n.
2. according to the Feeder Design method of the big wall thickness semi-circular inner casing casting described in claim 1, it is characterised in that the rising head
Two outside is also provided with and the identical heat-insulation layer of rising head one.
3. the Feeder Design method of big wall thickness semi-circular inner casing casting according to claim 1, it is characterised in that described to emit
The curved edge of the heat-insulation layer of mouth one is provided with 40~50mm gap with core cavity cambered surface.
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| CN105598379B (en) * | 2016-03-23 | 2017-07-14 | 哈尔滨理工大学 | A kind of Feeder Design method in thin-wall revolving body casting sand mold casting process predicted based on shrinkage defect |
| CN107159847A (en) * | 2017-04-12 | 2017-09-15 | 共享铸钢有限公司 | A kind of casting method of steam turbine inner casing casting |
| CN112122557A (en) * | 2020-08-25 | 2020-12-25 | 常熟市虹桥铸钢有限公司 | Casting method of upper casting piece of gearless electric propeller |
| CN114985682A (en) * | 2022-06-08 | 2022-09-02 | 荃胜精密机械工业（中山）有限公司 | Method for improving shrinkage cavity of golf head casting |
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| DE2923393C2 (en) * | 1979-06-08 | 1984-01-26 | Foseco International Ltd., Birmingham | Process for the production of casting molds with feeders |
| CN102794408B (en) * | 2012-07-23 | 2015-07-15 | 宁夏共享集团有限责任公司 | Method for teeming dead head of steel casting |
| CN103658541B (en) * | 2013-12-19 | 2016-04-06 | 中国船舶重工集团公司第十二研究所 | The method to set up of marine diesel fuselage casting pressing port |
| CN104439086B (en) * | 2014-12-08 | 2016-08-24 | 哈尔滨理工大学 | The method for designing of rising head in a kind of non-axis symmetry intricate casting sand casting process |
| CN104646635A (en) * | 2015-01-29 | 2015-05-27 | 夏平桂 | Casting method for valve body of expansion valve |
| CN104722713B (en) * | 2015-03-30 | 2017-01-04 | 共享铸钢有限公司 | A kind of dead head structure of sheet-type steel-casting |
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