CN105382203A - Novel casting method for steam turbine valve shell casting - Google Patents

Novel casting method for steam turbine valve shell casting Download PDF

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Publication number
CN105382203A
CN105382203A CN201510722916.2A CN201510722916A CN105382203A CN 105382203 A CN105382203 A CN 105382203A CN 201510722916 A CN201510722916 A CN 201510722916A CN 105382203 A CN105382203 A CN 105382203A
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CN
China
Prior art keywords
foundry goods
valve casing
split
casing foundry
steam turbine
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Application number
CN201510722916.2A
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Chinese (zh)
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CN105382203B (en
Inventor
张立文
徐鹏波
张学君
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Share Cast Steel Co Ltd
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Share Cast Steel Co Ltd
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Publication of CN105382203A publication Critical patent/CN105382203A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings
    • B22C9/24Moulds for peculiarly-shaped castings for hollow articles

Abstract

A novel casting method for a steam turbine valve shell casting comprises the following steps that solid model split parts of the steam turbine valve shell casting are manufactured, the maximum section of the steam turbine valve shell casting is selected as a parting surface, the corresponding upper valve shell casting solid model split part and the corresponding lower valve shell casting solid model split part are manufactured, and a middle pipe opening is located in the upper valve shell casting solid model split part; modeling is carried out, lower box modeling is carried out, a sand box and the lower valve shell casting solid model split part are arranged on a modeling platform, quick sand modeling is carried out, a pouring system is laid, and box overturning is carried out after placement is conducted for preset time; upper box modeling is carried out, the other sand box and the upper valve shell casting solid model split part are arranged on a lower box, quick sand modeling is carried out, and open risers are arranged on the side walls, close to the middle pipe opening, of the upper valve shell casting solid model split part and the end pipe opening, far away from the flange face, of the upper valve shell casting solid model split part; a sand core of an inner cavity of the steam turbine valve shell casting is manufactured; and after core setting, box combining, pouring, cooling and box beating, the steam turbine valve shell casting is finally obtained.

Description

The novel casting method of steam turbine valve casing foundry goods
Technical field
The present invention relates to casting technology field, particularly a kind of novel casting method of steam turbine valve casing foundry goods.
Background technology
Steam turbine valve casing casting structure is complicated, and the mouth of pipe is many and angle is different, more difficult during moulding.Core cavity narrow space simultaneously, rising head installation space is little, causes feeding a casting difficulty.In prior art, the casting technique of such foundry goods as shown in Figure 1 to Figure 3, by flange face 11 level of the steam turbine valve casing foundry goods physical model 10 corresponding to steam turbine valve casing foundry goods upwards, and is divided into the form of nowel 20, raising middle flask 21, top box 22 to carry out moulding; Flange face 11 arranges open riser 23, blind riser 24 is set at the close middle mouth of pipe 12 of steam turbine valve casing foundry goods physical model 10 and the end away from flange face 11 of inner chamber 13, carries out feeding.Meanwhile, the core of the inner chamber of steam turbine valve casing foundry goods physical model 10 is divided into 1# core, 2# core makes, ensure normal lower core, mould assembling.
There is following problem in above-mentioned casting method: 1. because arrange blind riser at core cavity, easily cause core cavity scab, easily hurt foundry goods during cutting, and it is comparatively difficult to arrange blind riser, is unfavorable for feeding a casting; 2. the blind riser position of inner chamber 1# core does not arrange core print, causes core location difficulty, and casting dimension is difficult to ensure; 3. be divided into three casees, upper, middle and lower to carry out during this kind of casting method moulding, actual production efficiency is low, and labor intensity of operating staff is large.
Summary of the invention
In view of this, the novel casting method of steam turbine valve casing foundry goods being necessary to provide a kind of and demonstrate,proving casting quality, reduce labor intensity of operating staff and enhance productivity.
A novel casting method for steam turbine valve casing foundry goods, comprises the steps:
Steam turbine valve casing foundry goods physical model split production: select the maximum cross-section of steam turbine valve casing foundry goods as die joint, produce corresponding upper valve casing foundry goods physical model split, the split of lower valve casing foundry goods physical model, after the split of upper valve casing foundry goods physical model coordinates with the split of lower valve casing foundry goods physical model, form the steam turbine valve casing foundry goods physical model corresponding with steam turbine valve casing foundry goods, the middle mouth of pipe is positioned in the split of valve casing foundry goods physical model, and the middle mouth of pipe is parallel with die joint;
Moulding: nowel moulding, a sandbox, the split of lower valve casing foundry goods physical model are placed on moulding platform, the cross section of lower valve casing foundry goods physical model split and moulding contact with platform, quicksand moulding is carried out after the split of lower valve casing foundry goods physical model sets up chill, lay running gate system, lay running gate system and comprise cross gate, sprue and ingate, cross gate is communicated with ingate, sprue simultaneously, ingate contacts with the split of lower valve casing foundry goods physical model, mould turnover after the placement scheduled time; Top box moulding, another sandbox, the split of upper valve casing foundry goods physical model are placed on nowel, carry out quicksand moulding, the cross section of upper valve casing foundry goods physical model contacts with nowel, and the end mouth of pipe simultaneously on the sidewall of the close middle mouth of pipe of upper valve casing foundry goods physical model split and away from flange face arranges open riser;
The core of the inner chamber of steam turbine valve casing foundry goods makes: according to the cavity shape of steam turbine valve casing foundry goods, produces corresponding integral sand core, and arranges core print in each end of integral sand core;
After lower core, mould assembling, cast, cooling, shake out, final acquisition steam turbine valve casing foundry goods.
In the novel casting method of above-mentioned steam turbine valve casing foundry goods, steam turbine valve casing foundry goods is kept flat moulding, only need two-part mo(u)lding, inner chamber only arranges an integral sand core, and lower core is convenient, not only ensures casting quality, improve production efficiency, correspondingly also reduce labor intensity of operating staff, during actual production, moulding efficiency improves 30%; Inner chamber does not need to design blind riser, and only need design open riser to carry out feeding, there is not inner chamber scab and incised wound problem, rising head easily cuts, and yield rate has brought up to 55% by original 40%.
Accompanying drawing explanation
Fig. 1 is formative technology schematic diagram in the casting method of existing steam turbine valve casing foundry goods.
Fig. 2 is feeding technology schematic diagram in the casting method of existing steam turbine valve casing foundry goods.
Fig. 3 is core piecemeal schematic diagram in the casting method of existing steam turbine valve casing foundry goods.
Fig. 4 is the formative technology schematic diagram in the novel casting method of steam turbine valve casing foundry goods of the present invention.
Fig. 5 is integral sand core schematic diagram in the casting method of steam turbine valve casing foundry goods of the present invention.
Fig. 6 is rising head and chill subregion casting technique schematic diagram in the casting method of steam turbine valve casing foundry goods of the present invention.
Fig. 7 is the schematic diagram figure that in the casting method of steam turbine valve casing foundry goods of the present invention, running gate system is laid.
In figure: steam turbine valve casing foundry goods physical model 10, flange face 11, the middle mouth of pipe 12, inner chamber 13, nowel 20, raising middle flask 21, top box 22, open riser 23, blind riser 24, upper valve casing foundry goods physical model split 31, lower valve casing foundry goods physical model split 32, the middle mouth of pipe 33, flange face 34, the end mouth of pipe 35, open riser 36, sandbox 41, sandbox 42, chill 50, running gate system 60, cross gate 61, sprue 62, ingate 63, integral sand core 70, core print 80.
Detailed description of the invention
The invention provides a kind of novel casting method of steam turbine valve casing foundry goods, referring to Fig. 4 to Fig. 7, comprise the steps:
Step S300, steam turbine valve casing foundry goods physical model split production: select the maximum cross-section of steam turbine valve casing foundry goods as die joint, produce corresponding upper valve casing foundry goods physical model split 31, lower valve casing foundry goods physical model split 32, after upper valve casing foundry goods physical model split 31 coordinates with lower valve casing foundry goods physical model split 32, form the steam turbine valve casing foundry goods physical model corresponding with steam turbine valve casing foundry goods, the middle mouth of pipe 33 is positioned in valve casing foundry goods physical model split 31, and the middle mouth of pipe 33 is parallel with die joint.
Step S301, moulding: nowel moulding, a sandbox 41, lower valve casing foundry goods physical model split 32 are placed on moulding platform, the cross section of lower valve casing foundry goods physical model split 32 and moulding contact with platform, quicksand moulding is carried out after lower valve casing foundry goods physical model split 32 sets up chill 50, lay running gate system 60 simultaneously, lay running gate system 60 and comprise cross gate 61, sprue 62 and ingate 63, cross gate 61 is communicated with ingate 63, sprue 62, ingate 63 contacts with lower valve casing foundry goods physical model split 32, mould turnover after the placement scheduled time; Top box moulding, another sandbox 42, upper valve casing foundry goods physical model split 31 are placed on nowel, carry out quicksand moulding, the cross section of upper valve casing foundry goods physical model 31 contacts with nowel, and the end mouth of pipe 35 simultaneously on the sidewall of the close middle mouth of pipe 33 of upper valve casing foundry goods physical model split 31 and away from flange face 34 arranges open riser 36.Wherein, the quantity of open riser 36 is three, the two side of the close middle mouth of pipe 33 of upper valve casing foundry goods physical model split 31 arranges two open risers 36, the end mouth of pipe 35 away from flange face 34 of upper valve casing foundry goods physical model split 31 arranges an open riser 36, so the mouth of pipe 33 in the middle of foundry goods is put straight up, be beneficial to rising head to arrange, facilitate feeding a casting; Ingate 63 is two groups, often organize ingate and comprise two vertical ingates, wherein one group of ingate 63 correspondence be positioned near upper valve casing foundry goods physical model split 31 flange face 34 open riser 36 immediately below, another group ingate 63 correspondence be positioned at immediately below flange face 34 open riser 36 farthest of upper valve casing foundry goods physical model split 31, the cross gate 61 laid is H-shaped, can ensure that the molten steel influent stream speed of four vertical ingates is even and steady; The diameter of the vertical ingate in ingate is φ 140mm, and the diameter of cross gate is φ 140mm, and the diameter of sprue is φ 120mm; Open riser 36 is stairstepping rising head, the second rising head that stairstepping rising head comprises the first rising head and is communicated with the first rising head, and the second rising head also contacts with upper valve casing foundry goods physical model split 31, the diameter 200mm larger than the diameter of the second rising head of the first rising head; Chill subregion is adopted immediately below flange face 34 open riser 36 farthest of upper valve casing foundry goods physical model split 31.
Step S302, the core of the inner chamber of steam turbine valve casing foundry goods makes: according to the cavity shape of steam turbine valve casing foundry goods, produces corresponding integral sand core 70, and arranges core print 80 in each end of integral sand core 70.In this step, the inner chamber of a foundry goods overall core is made, can ensure that core cavity does not have the defect such as fash, faulting of slab ends, conveniently play core simultaneously, the mouth of pipe place of core all arranges core print, to play the positioning action to core, also can prevent core floatation simultaneously, ensure that core cavity is of the required size.
Step S303, after lower core, mould assembling, cast, cooling, shake out, final acquisition steam turbine valve casing foundry goods.
In the novel casting method of above-mentioned steam turbine valve casing foundry goods, steam turbine valve casing foundry goods is kept flat moulding, only need two-part mo(u)lding, inner chamber only arranges an integral sand core, and lower core is convenient, not only ensures casting quality, improve production efficiency, correspondingly also reduce labor intensity of operating staff, during actual production, moulding efficiency improves 30%; Inner chamber does not need to design blind riser, and only need design open riser to carry out feeding, there is not inner chamber scab and incised wound problem, rising head easily cuts, and yield rate has brought up to 55% by original 40%.

Claims (5)

1. a novel casting method for steam turbine valve casing foundry goods, comprises the steps:
Steam turbine valve casing foundry goods physical model split production: select the maximum cross-section of steam turbine valve casing foundry goods as die joint, produce corresponding upper valve casing foundry goods physical model split, the split of lower valve casing foundry goods physical model, after the split of upper valve casing foundry goods physical model coordinates with the split of lower valve casing foundry goods physical model, form the steam turbine valve casing foundry goods physical model corresponding with steam turbine valve casing foundry goods, the middle mouth of pipe is positioned in the split of valve casing foundry goods physical model, and the middle mouth of pipe is parallel with die joint;
Moulding: nowel moulding, a sandbox, the split of lower valve casing foundry goods physical model are placed on moulding platform, the cross section of lower valve casing foundry goods physical model split and moulding contact with platform, quicksand moulding is carried out after the split of lower valve casing foundry goods physical model sets up chill, lay running gate system, lay running gate system and comprise cross gate, sprue and ingate, cross gate is communicated with ingate, sprue simultaneously, ingate contacts with the split of lower valve casing foundry goods physical model, mould turnover after the placement scheduled time; Top box moulding, another sandbox, the split of upper valve casing foundry goods physical model are placed on nowel, carry out quicksand moulding, the cross section of upper valve casing foundry goods physical model contacts with nowel, and the end mouth of pipe simultaneously on the sidewall of the close middle mouth of pipe of upper valve casing foundry goods physical model split and away from flange face arranges open riser;
The core of the inner chamber of steam turbine valve casing foundry goods makes: according to the cavity shape of steam turbine valve casing foundry goods, produces corresponding integral sand core, and arranges core print in each end of integral sand core;
After lower core, mould assembling, cast, cooling, shake out, final acquisition steam turbine valve casing foundry goods.
2. the novel casting method of steam turbine valve casing foundry goods according to claim 1, it is characterized in that: in step of overall modelling, the quantity of open riser is three, the two side of the close middle mouth of pipe of upper valve casing foundry goods physical model split arranges two open risers, the end mouth of pipe away from flange face of upper valve casing foundry goods physical model split arranges an open riser, ingate is two groups, often organize ingate and comprise two vertical ingates, what wherein one group of ingate was corresponding is positioned at immediately below the open riser of the flange face of upper valve casing foundry goods physical model split, what another group ingate was corresponding is positioned at immediately below the flange face open riser farthest of upper valve casing foundry goods physical model split, the cross gate laid is H-shaped.
3. the novel casting method of steam turbine valve casing foundry goods according to claim 2, is characterized in that: the diameter of the vertical ingate of ingate is φ 140mm, and the diameter of cross gate is φ 140mm, and the diameter of sprue is φ 120mm.
4. the novel casting method of steam turbine valve casing foundry goods according to claim 2, it is characterized in that: open riser is stairstepping rising head, the second rising head that stairstepping rising head comprises the first rising head and is communicated with the first rising head, second rising head also contacts with the split of upper valve casing foundry goods physical model, the diameter 200mm larger than the diameter of the second rising head of the first rising head.
5. the novel casting method of steam turbine valve casing foundry goods according to claim 2, is characterized in that: immediately below the flange face open riser farthest of upper valve casing foundry goods physical model split, adopt chill subregion.
CN201510722916.2A 2015-10-29 2015-10-29 The casting method of steam turbine valve casing casting Active CN105382203B (en)

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN105817579A (en) * 2016-05-06 2016-08-03 共享铸钢有限公司 Sand mould structure of tile edging casting of steam turbine
CN105839148A (en) * 2016-05-06 2016-08-10 共享铸钢有限公司 Manufacturing method for large nuclear power steel casting pattern
CN106363129A (en) * 2016-08-31 2017-02-01 共享铸钢有限公司 Casting technique of supporting frame for building
CN106734950A (en) * 2016-11-30 2017-05-31 共享铸钢有限公司 A kind of casting technique of hollow valve body steel-casting
CN107008863A (en) * 2017-03-10 2017-08-04 共享铸钢有限公司 The superposing type casting method of large scale annular steel-casting
CN107042287A (en) * 2017-02-28 2017-08-15 共享铸钢有限公司 A kind of casting method of steam turbine high pressure main air valve casting
CN107790629A (en) * 2017-09-28 2018-03-13 武汉重工铸锻有限责任公司 Large-scale bronze statue face integral casting method
CN107855464A (en) * 2017-10-30 2018-03-30 共享铸钢有限公司 A kind of formative method of ultra-large type steel-casting
CN109128046A (en) * 2018-10-29 2019-01-04 共享铸钢有限公司 A kind of casting method preventing cylinder casting nozzle defect
CN111421116A (en) * 2020-04-27 2020-07-17 中国船舶重工集团公司第七二五研究所 Preparation process of copper alloy filter shell for ship
CN111451449A (en) * 2020-06-07 2020-07-28 中车长江铜陵车辆有限公司 Bolster and bolster center plate capable of guaranteeing smoothness of inner side wall during cutting

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105817579B (en) * 2016-05-06 2017-12-22 共享铸钢有限公司 A kind of sand mould structure of steam turbine watt mouth casting
CN105839148A (en) * 2016-05-06 2016-08-10 共享铸钢有限公司 Manufacturing method for large nuclear power steel casting pattern
CN105817579A (en) * 2016-05-06 2016-08-03 共享铸钢有限公司 Sand mould structure of tile edging casting of steam turbine
CN106363129A (en) * 2016-08-31 2017-02-01 共享铸钢有限公司 Casting technique of supporting frame for building
CN106734950A (en) * 2016-11-30 2017-05-31 共享铸钢有限公司 A kind of casting technique of hollow valve body steel-casting
CN107042287A (en) * 2017-02-28 2017-08-15 共享铸钢有限公司 A kind of casting method of steam turbine high pressure main air valve casting
CN107008863A (en) * 2017-03-10 2017-08-04 共享铸钢有限公司 The superposing type casting method of large scale annular steel-casting
CN107790629A (en) * 2017-09-28 2018-03-13 武汉重工铸锻有限责任公司 Large-scale bronze statue face integral casting method
CN107855464A (en) * 2017-10-30 2018-03-30 共享铸钢有限公司 A kind of formative method of ultra-large type steel-casting
CN109128046A (en) * 2018-10-29 2019-01-04 共享铸钢有限公司 A kind of casting method preventing cylinder casting nozzle defect
CN109128046B (en) * 2018-10-29 2020-09-22 共享铸钢有限公司 Casting method for preventing defects of cylinder casting pipe orifice
CN111421116A (en) * 2020-04-27 2020-07-17 中国船舶重工集团公司第七二五研究所 Preparation process of copper alloy filter shell for ship
CN111451449A (en) * 2020-06-07 2020-07-28 中车长江铜陵车辆有限公司 Bolster and bolster center plate capable of guaranteeing smoothness of inner side wall during cutting

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