CN105328128A - Manufacturing method of strap sand core for casting ultra-supercritical turbine cylinder - Google Patents
Manufacturing method of strap sand core for casting ultra-supercritical turbine cylinder Download PDFInfo
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- CN105328128A CN105328128A CN201410389790.7A CN201410389790A CN105328128A CN 105328128 A CN105328128 A CN 105328128A CN 201410389790 A CN201410389790 A CN 201410389790A CN 105328128 A CN105328128 A CN 105328128A
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- suspender belt
- core
- circular arc
- lifting
- turbine cylinder
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Abstract
The invention discloses a manufacturing method of a strap sand core for casting an ultra-supercritical turbine cylinder. The manufacturing method comprises the following steps that firstly, an inner supporting frame of a circular arc strap part and an air outlet pipe are placed in a circular arc cavity of a wood die; secondly, the circular arc strap part of the strap sand core is formed; thirdly, combinations of two sets of hoisting core bars and pin plates are placed in two core head part cavities of the wood die respectively; and fourthly, two core heads of the strap sand core are formed. The strap sand core is convenient to hoist, the phenomenon of cracking in the hoisting process cannot occur, and the quality of the surface at a hoisting core belt position of a cast ultra-supercritical turbine cylinder steel casting meets the requirements for operation and cylinder technique quality.
Description
Technical field
The present invention relates to a kind of preparation method of core, being specifically related to a kind of preparation method of the suspender belt core for casting supercritical turbine cylinder.
Background technology
Supercritical turbine cylinder steel castings is the large-scale key components and parts of steam-turbine unit.Material GX12CrMoVNbN9-1, GX12CrMoWVNbN10-1-1 of this cylinder steel castings are martensitic stain less steel, relatively general low alloy material steam turbine cylinder, it has higher heat resistance, the pressure of higher high, medium and low cylinder body, high-temperature creep-resistant property, can meet the power of extra-supercritical unit, environmental protection and energy-efficient performance, be the trend of generating set development.
Supercritical turbine cylinder steel castings complex structure, this cylinder steel castings needs the core of use three " suspender belt " shapes in manufacturing process.And the making of this suspender belt core is quite difficult, mainly contain two large difficult points: 1, suspender belt core area size is wayward; 2, suspender belt core lifting process easily ruptures.In core lifting process, if produce cracking, in casting process, molten steel can enter core, causes the cavity iron clamp sand of this cylinder body suspender belt core position on the one hand, causes difficulty of shaking out; Crackle hidden danger can be caused on the other hand when iron clamp sand.Meanwhile, cause iron clamp sand phenomenon that core itself can be hindered to give vent to anger, dispel the heat if molten steel enters core, also can cause uneven in temperature cracking owing to finally cooling.
Suspender belt core for making supercritical turbine cylinder steel castings can make cylinder body corresponding site meet following technical requirement:
1, internal soundness requires to carry out magnetic and ultrasonic examination, and surface has not allowed the defects such as crackle, scab, shrinkage cavity and cold shut;
2, size, tolerance reach CT14 grade in GB6414 standard;
3, inner wall surface cleannes require to reach in JB/T4058 clean-2;
4, surface roughness requirements reaches Ra12.5 μm.
Meanwhile, because cylinder body divides upper and lower half, require that upper and lower half split size positions everywhere should be alignd, otherwise can affect the airflow circulating of cylinder interior, for this reason, the size of suspender belt core is accurately particularly important.
The suspender belt core made by existing method is adopted to meet above-mentioned requirements.
Summary of the invention
Technical problem to be solved by this invention is to provide one, and it can make the performance of suspender belt core reach the requirement of regulation, and the process core of lifting can not damage, thus eliminates the various hidden danger of quality that this supercritical turbine cylinder causes due to core problem.
For solving the problems of the technologies described above, the present invention for casting the technical solution of the preparation method of the suspender belt core of supercritical turbine cylinder is:
Described suspender belt core comprises circular arc suspender belt portion, and the cross section in circular arc suspender belt portion is arc, and the two ends in circular arc suspender belt portion connect core print respectively; Adopt suspender belt core wooden model, the inside of wooden model forms cavity, and described cavity comprises arc sections cavity and two core head cavitys; Comprise the following steps:
Step one, the interior shelf in circular arc suspender belt portion and escape pipe are put into the arc sections cavity of wooden model;
Described interior shelf comprises two longitudinal bracing muscle and envelope rack; Described longitudinal bracing muscle extends, for longitudinal bracing suspender belt core along the length direction in circular arc suspender belt portion; Described envelope rack is tubular, length direction along circular arc suspender belt portion extends, and the shape of the cross section of envelope rack is identical with the cross section in circular arc suspender belt portion, the cross section being dimensioned slightly smaller than circular arc suspender belt portion of the cross section of envelope rack, for cross-brace suspender belt core.
Two longitudinal bracing muscle are surrounded on its inside by described envelope rack; And two longitudinal bracing muscle are arranged at the both sides of described escape pipe.
The circular arc suspender belt portion of step 2, formation suspender belt core;
By chrome ore resin sand Piles sandfilling in the arc sections cavity of wooden model, form the circular arc suspender belt portion of suspender belt core;
The order of described Piles sand is: from middle bottommost to both sides toward the preceding paragraph one section of Piles sand, every section complete after fix with holding screw, until two of arc sections cavity tops.
Step 3, two cover lifting arbors and the assembly of pin plate are put into respectively two core head cavitys of wooden model;
Guarantee the spacing between the perpendicularity of pin plate and two pin plates when putting into lifting arbor and the assembly of pin plate, and make two pin plate spacing with lift by crane panelgirder to open grade spacing consistent.
Two core prints of step 4, formation suspender belt core;
By self-setting silicate process Piles sandfilling in two core head cavitys of wooden model, until the top plane of core head cavity, form two core prints of suspender belt core, complete the making of suspender belt core.
Step 5, lifting panelgirder is fixedly connected on two pin plates;
After self-setting silicate process is certainly hard, lifting panelgirder is penetrated in two pin plates, and by fastening wedge, lifting panelgirder is fixedly connected with pin plate;
Step 6, lifting;
By steel wire loop in the recess at lifting panelgirder two ends, loosen wooden model, by driving, suspender belt core is hung out from wooden model.
The technique effect that the present invention can reach is:
Suspender belt core made by the present invention, its surface quality is good, and the degree of packing is high, good stability, there is not cracking phenomena in the lifting each link of core that falls, in cast, core does not offset, and effectively can guarantee the surface quality of steam turbine cylinder, dimensional accuracy meets technical quality requirement.
Adopt suspender belt core of the present invention lift by crane convenient and cracking phenomena can not occur in lifting process, the supercritical turbine cylinder steel castings cast, the surface quality at its suspended core waistband place meets operation and the requirement of cylinder body technical quality.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 a is the schematic diagram of the suspender belt core adopted made by the present invention;
Fig. 1 b is the top view of Fig. 1 a;
Fig. 2 a is the schematic diagram of lifting arbor used in the present invention;
Fig. 2 b is the top view of Fig. 2 a;
Fig. 2 c is the left view of Fig. 2 a;
Fig. 2 d is the right view of Fig. 2 a;
Fig. 3 a is the schematic diagram of pin plate used in the present invention;
Fig. 3 b is the side view of Fig. 3 a;
Fig. 4 a is the schematic diagram of lifting panelgirder used in the present invention;
Fig. 4 b is the top view of Fig. 4 a;
Fig. 5 is the connection diagram of lifting arbor of the present invention and pin plate;
Fig. 6 is lifting schematic diagram of the present invention.
Description of reference numerals in figure:
1 is circular arc suspender belt portion, and 2 is core print,
3 is escape pipe, and 11 is longitudinal bracing muscle,
13 is envelope rack,
4 is lifting arbor, and 5 is pin plate,
41 is arbor base plate, and 42 is connecting rod,
6 is lifting panelgirder, and 7 is fastening wedge,
8 is steel wire rope, and 10 is suspender belt core.
Detailed description of the invention
The present invention is for casting the preparation method of the suspender belt core of supercritical turbine cylinder, and described suspender belt core is for casting supercritical turbine cylinder steel castings;
As shown in Figure 1 a, 1 b, described suspender belt core comprises circular arc suspender belt portion 1, and the central angle corresponding to circular arc suspender belt portion 1 is not less than 180 °; The cross section in circular arc suspender belt portion 1 is arc, and namely the middle part in circular arc suspender belt portion 1 is thick, and top and the bottom are thin; The two ends in circular arc suspender belt portion 1 connect core print 2 respectively; The inside in circular arc suspender belt portion 1 is provided with escape pipe 3, and escape pipe 3 extends along the length direction in circular arc suspender belt portion 1, and stretches out from the top of the core print 2 at two ends;
Preparation method of the present invention adopts suspender belt core wooden model, wooden model is that benchmark is divided into two parts with horizontal centre, the latter half is overall full pattern, the first half is divided into multistage, the inside of wooden model forms cavity, the shape of cavity and the shape of suspender belt core match, and namely cavity comprises arc sections cavity and two core head cavitys; Comprise the following steps:
Step one, the interior shelf in circular arc suspender belt portion 1 and escape pipe 3 are put into the arc sections cavity of wooden model;
Interior shelf comprises two longitudinal bracing muscle 11 and envelope rack 13;
Longitudinal bracing muscle 11 is as crab, and the length direction along circular arc suspender belt portion 1 extends, for longitudinal bracing suspender belt core;
Envelope rack 13 is tubular, length direction along circular arc suspender belt portion 1 extends, and the shape of the cross section of envelope rack 13 is identical with the cross section in circular arc suspender belt portion 1, is dimensioned slightly smaller than the cross section in circular arc suspender belt portion 1, for cross-brace suspender belt core, to ensure the intensity of core;
Two longitudinal bracing muscle 11 are surrounded on its inside by envelope rack 13; And two longitudinal bracing muscle 11 symmetries are arranged side by side the both sides in escape pipe 3;
Envelope rack 13 can adopt round steel according to the curved circle of the shape of suspender belt core and weld together with longitudinal bracing muscle 11.
The circular arc suspender belt portion 1 of step 2, formation suspender belt core;
By chrome ore resin sand Piles sandfilling in the arc sections cavity of wooden model, the interior shelf in circular arc suspender belt portion 1 and escape pipe 3 are coated on inside, form the circular arc suspender belt portion 1 of suspender belt core;
The order of Piles sand is: from middle bottommost to both sides toward the preceding paragraph one section of Piles sand, every section complete after fix with holding screw, until two of arc sections cavity tops (being the baseplane of core head cavity herein);
Because longitudinal bracing muscle 11 is positioned at the middle part of core, the intensity of core can be increased;
Step 3, two cover lifting arbors 4 and pin plate 5 thereof are put into two core head cavitys of wooden model respectively;
As shown in Fig. 2 a to Fig. 2 d, lifting arbor 4 comprises the top that arbor base plate 41 and two connecting rods, 42, two connecting rods 42 are fixedly installed on arbor base plate 41;
Between two connecting rods 42 by holding screw the bottom of the pin plate 5 such as shown in Fig. 3 a to Fig. 3 b being fixedly attached to lifting arbor 4, realize pin plate 5 and lift by crane being fixedly connected with of arbor 4, as shown in Figure 5;
And then two cover lifting arbors and pin plate thereof are put into two core head cavitys of wooden model respectively, guarantee the spacing between the perpendicularity of pin plate 5 and two pin plates 5 when putting into, make two pin plate spacing with lift by crane panelgirder to open grade spacing consistent;
Two core prints 2 of step 4, formation suspender belt core;
By self-setting silicate process Piles sandfilling in two core head cavitys of wooden model, until the top plane of core head cavity, lifting arbor 4 and pin plate 5 thereof are coated on inside, form two core prints 2 of suspender belt core, complete the making of suspender belt core 10;
Step 5, lifting panelgirder 6 is fixedly connected on two pin plates 5;
After self-setting silicate process is certainly hard, the lifting panelgirder 6 such as shown in Fig. 4 a to Fig. 4 b is penetrated in two pin plates 5, and by fastening wedge 7, lifting panelgirder 6 is fixedly connected with pin plate 5;
Step 6, lifting;
As shown in Figure 6, steel wire rope 8 is enclosed within the recess at lifting panelgirder 6 two ends, loosens wooden model, by driving, suspender belt core is hung out from wooden model.
Lifting panelgirder 6 in the present invention unloads and can reuse; Lifting arbor 4 and pin plate 5 casting pouring complete unpack after also can reuse.
Suspender belt core made by the present invention can make the corresponding site of steam turbine cylinder meet following performance indications:
1, the surperficial flawless of steam turbine cylinder, scab, the defect such as shrinkage cavity and cold shut;
2, the size of steam turbine cylinder, tolerance reach CT14 grade in GB6414 standard, (unit mm) as shown in the table;
Dimensional tolerance of casting value mm
3, the surface roughness requirements of steam turbine cylinder reaches Ra12.5 μm.
Claims (6)
1. for casting a preparation method for the suspender belt core of supercritical turbine cylinder, described suspender belt core comprises circular arc suspender belt portion, and the cross section in circular arc suspender belt portion is arc, and the two ends in circular arc suspender belt portion connect core print respectively; It is characterized in that, adopt suspender belt core wooden model, the inside of wooden model forms cavity, and described cavity comprises arc sections cavity and two core head cavitys; Comprise the following steps:
Step one, the interior shelf in circular arc suspender belt portion and escape pipe are put into the arc sections cavity of wooden model;
The circular arc suspender belt portion of step 2, formation suspender belt core;
By chrome ore resin sand Piles sandfilling in the arc sections cavity of wooden model, form the circular arc suspender belt portion of suspender belt core;
Step 3, two cover lifting arbors and the assembly of pin plate are put into respectively two core head cavitys of wooden model;
Two core prints of step 4, formation suspender belt core;
By self-setting silicate process Piles sandfilling in two core head cavitys of wooden model, until the top plane of core head cavity, form two core prints of suspender belt core, complete the making of suspender belt core.
2. the preparation method of the suspender belt core for casting supercritical turbine cylinder according to claim 1, is characterized in that, the interior shelf in described step one comprises two longitudinal bracing muscle and envelope rack; Described longitudinal bracing muscle extends, for longitudinal bracing suspender belt core along the length direction in circular arc suspender belt portion; Described envelope rack is tubular, length direction along circular arc suspender belt portion extends, and the shape of the cross section of envelope rack is identical with the cross section in circular arc suspender belt portion, the cross section being dimensioned slightly smaller than circular arc suspender belt portion of the cross section of envelope rack, for cross-brace suspender belt core.
3. the preparation method of the suspender belt core for casting supercritical turbine cylinder according to claim 2, is characterized in that, two longitudinal bracing muscle are surrounded on its inside by described envelope rack; And two longitudinal bracing muscle are arranged at the both sides of described escape pipe.
4. the preparation method of the suspender belt core for casting supercritical turbine cylinder according to claim 1, it is characterized in that, in described step 2, the order of Piles sand is: from middle bottommost to both sides toward the preceding paragraph one section of Piles sand, every section complete after fix with holding screw, until two of arc sections cavity tops.
5. the preparation method of the suspender belt core for casting supercritical turbine cylinder according to claim 1, it is characterized in that, guarantee the spacing between the perpendicularity of pin plate and two pin plates when putting into lifting arbor and the assembly of pin plate in described step 3, and make two pin plate spacing with lift by crane panelgirder to open grade spacing consistent.
6. the preparation method of the suspender belt core for casting supercritical turbine cylinder according to claim 1, is characterized in that, perform following steps after described step 4:
Step 5, lifting panelgirder is fixedly connected on two pin plates;
After self-setting silicate process is certainly hard, lifting panelgirder is penetrated in two pin plates, and by fastening wedge, lifting panelgirder is fixedly connected with pin plate;
Step 6, lifting;
By steel wire loop in the recess at lifting panelgirder two ends, loosen wooden model, by driving, suspender belt core is hung out from wooden model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410389790.7A CN105328128B (en) | 2014-08-08 | 2014-08-08 | Preparation method for casting the suspender belt core of supercritical turbine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410389790.7A CN105328128B (en) | 2014-08-08 | 2014-08-08 | Preparation method for casting the suspender belt core of supercritical turbine cylinder |
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| CN105328128A true CN105328128A (en) | 2016-02-17 |
| CN105328128B CN105328128B (en) | 2017-07-11 |
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| CN201410389790.7A Active CN105328128B (en) | 2014-08-08 | 2014-08-08 | Preparation method for casting the suspender belt core of supercritical turbine cylinder |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4375282A (en) * | 1980-06-30 | 1983-03-01 | United Technologies Corporation | Core configuration for casting hollow parts in mating halves |
| CN1954937A (en) * | 2005-10-25 | 2007-05-02 | 上海重型机器冶铸厂 | Casting method of vanadium-containing steam turbine cylinder for supercritical machine set |
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| CN201524770U (en) * | 2009-09-22 | 2010-07-14 | 广西玉柴机器股份有限公司 | Casting suspended core apparatus |
| CN202129410U (en) * | 2011-05-31 | 2012-02-01 | 日月重工股份有限公司 | Core print for traction sheave casting mould |
| CN102921899A (en) * | 2012-10-23 | 2013-02-13 | 宝鸡石油机械有限责任公司 | Method for casting U-shaped lifting ring steel casting |
| CN103223471A (en) * | 2013-05-15 | 2013-07-31 | 日月重工股份有限公司 | Method for manufacturing medium-pressure outer cylinder spheroidal graphite iron casting of ultra-supercritical turbine |
-
2014
- 2014-08-08 CN CN201410389790.7A patent/CN105328128B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4375282A (en) * | 1980-06-30 | 1983-03-01 | United Technologies Corporation | Core configuration for casting hollow parts in mating halves |
| CN1954937A (en) * | 2005-10-25 | 2007-05-02 | 上海重型机器冶铸厂 | Casting method of vanadium-containing steam turbine cylinder for supercritical machine set |
| CN201362550Y (en) * | 2009-02-06 | 2009-12-16 | 南方汇通股份有限公司 | Side frame whole sand core hanger |
| CN201524770U (en) * | 2009-09-22 | 2010-07-14 | 广西玉柴机器股份有限公司 | Casting suspended core apparatus |
| CN202129410U (en) * | 2011-05-31 | 2012-02-01 | 日月重工股份有限公司 | Core print for traction sheave casting mould |
| CN102921899A (en) * | 2012-10-23 | 2013-02-13 | 宝鸡石油机械有限责任公司 | Method for casting U-shaped lifting ring steel casting |
| CN103223471A (en) * | 2013-05-15 | 2013-07-31 | 日月重工股份有限公司 | Method for manufacturing medium-pressure outer cylinder spheroidal graphite iron casting of ultra-supercritical turbine |
Non-Patent Citations (2)
| Title |
|---|
| 中国机械工程学会铸造分会: "《铸造手册.铸造工艺（第2版））》", 31 January 2003, 机械工业出版社 * |
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| CN105328128B (en) | 2017-07-11 |
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Effective date of registration: 20161130 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Applicant after: Shanghai Electric Heavy Forging Co. Ltd. Applicant after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Applicant before: Shanghai Heavy Machines Plant Co., Ltd. |
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