CN105382203B - The casting method of steam turbine valve casing casting - Google Patents

The casting method of steam turbine valve casing casting Download PDF

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Publication number
CN105382203B
CN105382203B CN201510722916.2A CN201510722916A CN105382203B CN 105382203 B CN105382203 B CN 105382203B CN 201510722916 A CN201510722916 A CN 201510722916A CN 105382203 B CN105382203 B CN 105382203B
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CN
China
Prior art keywords
valve casing
casting
split
casing casting
physical
Prior art date
Application number
CN201510722916.2A
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Chinese (zh)
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CN105382203A (en
Inventor
张立文
徐鹏波
张学君
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共享铸钢有限公司
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Priority to CN201510722916.2A priority Critical patent/CN105382203B/en
Publication of CN105382203A publication Critical patent/CN105382203A/en
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Publication of CN105382203B publication Critical patent/CN105382203B/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 kind of casting method of steam turbine valve casing casting, comprises the following steps:Steam turbine valve casing casting physical model split production:The maximum cross-section of steam turbine valve casing casting is selected as die joint, corresponding upper valve casing casting physical model split, lower valve casing casting physical model split is produced, the middle mouth of pipe is located in upper valve casing casting physical model split;Moulding:Nowel moulding, a sandbox, lower valve casing casting physical model split are placed on build platform, carry out quicksand moulding, lay running gate system, place mould turnover after the scheduled time;Top box moulding, another sandbox, upper valve casing casting physical model split are placed on nowel, carry out quicksand moulding, in the end mouth of pipe setting open riser on the side wall of the middle mouth of pipe and away from flange face of upper valve casing casting physical model split;The core of the inner chamber of steam turbine valve casing casting makes;It is final to obtain steam turbine valve casing casting after lower core, mould assembling, cast, cooling, shake out.

Description

The casting method of steam turbine valve casing casting
Technical field
The present invention relates to casting technology field, more particularly to a kind of casting method of steam turbine valve casing casting.
Background technology
Steam turbine valve casing casting structure is complicated, and the mouth of pipe is more and angle is different, relatively difficult during moulding.While core cavity Narrow space, rising head installation space is small, causes feeding a casting difficult.In the prior art, the casting technique of such casting such as Fig. 1 is extremely Shown in Fig. 3, by the level of flange face 11 of the steam turbine valve casing casting physical model 10 corresponding to steam turbine valve casing casting to On, and it is divided into the form progress moulding of nowel 20, raising middle flask 21, top box 22;Open riser 23 is set on flange face 11, in vapor wheel The end of the remote flange face 11 close to the middle mouth of pipe 12 and inner chamber 13 of machine valve casing casting physical model 10 sets blind riser 24, Carry out feeding.Meanwhile, the core of the inner chamber of steam turbine valve casing casting physical model 10 is divided into 1# cores, 2# core systems Make, it is ensured that normally play core, mould assembling.
There is problems with above-mentioned casting method:1. because setting blind riser in core cavity, it is easily caused core cavity Scab, easily hurts casting during cutting, and sets blind riser more difficult, is unfavorable for feeding a casting;2. inner chamber 1# cores Blind riser position is not provided with core print, causes core location difficulty, and casting dimension is difficult to ensure;3. during this kind of casting method moulding It is divided into the three casees progress in upper, middle and lower, actual production efficiency is low, and labor intensity of operating staff is big.
The content of the invention
In view of this, it is necessary to a kind of card casting quality, reduction labor intensity of operating staff are provided and production efficiency is improved Steam turbine valve casing casting casting method.
A kind of casting method of steam turbine valve casing casting, comprises the following steps:
Steam turbine valve casing casting physical model split production:Select steam turbine valve casing casting maximum cross-section as point Type face, produces corresponding upper valve casing casting physical model split, lower valve casing casting physical model split, upper valve casing casting entity After model split coordinates with lower valve casing casting physical model split, the steam turbine corresponding with steam turbine valve casing casting is formed Valve casing casting physical model, the middle mouth of pipe is located in upper valve casing casting physical model split, and the middle mouth of pipe is parallel with die joint;
Moulding:Nowel moulding, a sandbox, lower valve casing casting physical model split is placed on build platform, lower valve The section of shell casting physical model split is contacted with build platform, after setting up chill in lower valve casing casting physical model split Carry out quicksand moulding, while lay running gate system, laying running gate system include cross gate, sprue and ingate, cross gate with Ingate, sprue connection, ingate are contacted with lower valve casing casting physical model split, place mould turnover after the scheduled time;Top box Moulding, another sandbox, upper valve casing casting physical model split are placed on nowel, carry out quicksand moulding, upper valve casing casting The section of physical model is contacted with nowel, at the same upper valve casing casting physical model split on the side wall of the middle mouth of pipe and The end mouth of pipe away from flange face sets open riser;
The core of the inner chamber of steam turbine valve casing casting makes:According to the cavity shape of steam turbine valve casing casting, make Go out corresponding integral sand core, and core print is set in each end of integral sand core;
It is final to obtain steam turbine valve casing casting after lower core, mould assembling, cast, cooling, shake out.
In the casting method of above-mentioned steam turbine valve casing casting, steam turbine valve casing casting is kept flat into moulding, it is only necessary to two Case moulding, inner chamber only sets an integral sand core, and lower core is convenient, not only ensures casting quality, improves production efficiency, correspondingly Also labor intensity of operating staff is reduced, during actual production, moulding efficiency improves 30%;Inner chamber need not design blind riser, only need Design open riser and carry out feeding, in the absence of inner chamber scab and incised wound problem, rising head is easily cut, and yield rate is carried by original 40% It is high to 55%.
Brief description of the drawings
Fig. 1 is formative technology schematic diagram in the casting method of existing steam turbine valve casing casting.
Fig. 2 is feeding technology schematic diagram in the casting method of existing steam turbine valve casing casting.
Fig. 3 is core piecemeal schematic diagram in the casting method of existing steam turbine valve casing casting.
Fig. 4 is the formative technology schematic diagram in the casting method of steam turbine valve casing casting of the present invention.
Fig. 5 is integral sand core schematic diagram in the casting method of steam turbine valve casing casting of the present invention.
Fig. 6 is that rising head in the casting method of steam turbine valve casing casting of the present invention and chill subregion casting technique are shown It is intended to.
The schematic diagram figure that Fig. 7 lays for running gate system in the casting method of steam turbine valve casing casting of the present invention.
In figure:Steam turbine valve casing casting physical model 10, flange face 11, the middle mouth of pipe 12, inner chamber 13, nowel 20, in Case 21, top box 22, open riser 23, blind riser 24, upper valve casing casting physical model split 31, lower valve casing casting physical model split 32nd, 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, horizontal stroke Running channel 61, sprue 62, ingate 63, integral sand core 70, core print 80.
Embodiment
The present invention provides a kind of casting method of steam turbine valve casing casting, referring to Fig. 4 to Fig. 7, including as follows Step:
Step S300, steam turbine valve casing casting physical model split production:Select the maximum of steam turbine valve casing casting Corresponding upper valve casing casting physical model split 31, lower valve casing casting physical model split 32 are produced in section as die joint, After upper valve casing casting physical model split 31 coordinates with lower valve casing casting physical model split 32, formed and cast with steam turbine valve casing The corresponding steam turbine valve casing casting physical model of part, the middle mouth of pipe 33 is located in upper valve casing casting physical model split 31, The middle mouth of pipe 33 is parallel with die joint.
Step S301, moulding:Nowel moulding, a sandbox 41, lower valve casing casting physical model split 32 are placed on and made On type platform, the section of lower valve casing casting physical model split 32 is contacted with build platform, in lower valve casing casting physical model point Progress quicksand moulding after chill 50 is set up on body 32, while laying running gate system 60, laying running gate system 60 includes cross gate 61st, sprue 62 and ingate 63, cross gate 61 are connected with ingate 63, sprue 62, and ingate 63 is real with lower valve casing casting Body Model split 32 is contacted, and places mould turnover after the scheduled time;Top box moulding, by another sandbox 42, upper valve casing casting entity mould Type split 31 is placed on nowel, carries out quicksand moulding, and the section of upper valve casing casting physical model 31 is contacted with nowel, while Upper valve casing casting physical model split 31 on the side wall of the middle mouth of pipe 33 and the end mouth of pipe 35 away from flange face 34 is set Put open riser 36.Wherein, the quantity of open riser 36 is three, the close middle mouth of pipe 33 of upper valve casing casting physical model split 31 Two side on set two open risers 36, the end mouth of pipe 35 of the remote flange face 34 of upper valve casing casting physical model split 31 One open riser 36 is set, so put the mouth of pipe 33 in the middle of casting straight up, is set beneficial to rising head, facilitates feeding a casting; Ingate 63 is two groups, and every group of ingate includes two vertical ingates, and one of which ingate 63 is corresponding to be located at close to upper The underface of the open riser 36 of the flange face 34 of valve casing casting physical model split 31, another group of ingate 63 it is corresponding be located at from The underface of the farthest open riser 36 of the flange face 34 of upper valve casing casting physical model split 31, the cross gate 61 of laying is H-shaped, It ensure that the molten steel influent stream speed of four vertical ingates is uniform and steady;A diameter of φ of vertical ingate in ingate 140mm, a diameter of φ 140mm of cross gate, a diameter of φ 120mm of sprue;Open riser 36 is stairstepping rising head, ladder Shape rising head includes the first rising head and the second rising head connected with the first rising head, and the second rising head also divides with upper valve casing casting physical model Body 31 is contacted, diameter big 200mm of the diameter than the second rising head of the first rising head;From the method for upper valve casing casting physical model split 31 The underface of the farthest open riser 36 in blue face 34 uses chill subregion.
Step S302, the core of the inner chamber of steam turbine valve casing casting makes:According to the inner chamber of steam turbine valve casing casting Shape, produces corresponding integral sand core 70, and set core print 80 in each end of integral sand core 70.In this step, will The inner chamber of casting is made of the core of an entirety, ensure that core cavity does not have the defects such as fash, faulting of slab ends, while for side Just play at core, the mouth of pipe of core and be respectively provided with core print, to play the positioning action to core, while prevented also from core floatation, it is ensured that casting Part inner chamber is of the required size.
It is final to obtain steam turbine valve casing casting after step S303, lower core, mould assembling, cast, cooling, shake out.
In the casting method of above-mentioned steam turbine valve casing casting, steam turbine valve casing casting is kept flat into moulding, it is only necessary to two Case moulding, inner chamber only sets an integral sand core, and lower core is convenient, not only ensures casting quality, improves production efficiency, correspondingly Also labor intensity of operating staff is reduced, during actual production, moulding efficiency improves 30%;Inner chamber need not design blind riser, only need Design open riser and carry out feeding, in the absence of inner chamber scab and incised wound problem, rising head is easily cut, and yield rate is carried by original 40% It is high to 55%.

Claims (4)

1. a kind of casting method of steam turbine valve casing casting, comprises the following steps:Steam turbine valve casing casting physical model Split production:Select the maximum cross-section of steam turbine valve casing casting as die joint, produce corresponding upper valve casing casting entity Model split, lower valve casing casting physical model split, upper valve casing casting physical model split and lower valve casing casting physical model point After body coordinates, the steam turbine valve casing casting physical model corresponding with steam turbine valve casing casting is formed, the middle mouth of pipe is located at In upper valve casing casting physical model split, the middle mouth of pipe is parallel with die joint;Moulding:Nowel moulding, by a sandbox, under Valve casing casting physical model split is placed on build platform, and the section of lower valve casing casting physical model split connects with build platform Touch, progress quicksand moulding after chill is set up in lower valve casing casting physical model split, while laying running gate system, laying is poured Injection system includes cross gate, sprue and ingate, and cross gate is connected with ingate, sprue, ingate and lower valve casing casting Physical model split is contacted, and places mould turnover after the scheduled time;Top box moulding, by another sandbox, upper valve casing casting physical model Split is placed on nowel, carries out quicksand moulding, the section of upper valve casing casting physical model is contacted with nowel, while in upper valve The end mouth of pipe setting open riser on the side wall of the middle mouth of pipe and away from flange face of shell casting physical model split;Its In, the quantity of open riser is three, the setting two on the two side of the middle mouth of pipe of upper valve casing casting physical model split Open riser, the end mouth of pipe of the remote flange face of upper valve casing casting physical model split sets an open riser, and ingate is two Group, every group of ingate includes two vertical ingates, and one of which ingate is corresponding to be located at close to upper valve casing casting entity mould The underface of the open riser of the flange face of type split, another group of ingate is corresponding to be located at from upper valve casing casting physical model split The farthest open riser of flange face underface, the cross gate of laying is H shapes;The sand of the inner chamber of steam turbine valve casing casting Core makes:According to the cavity shape of steam turbine valve casing casting, corresponding integral sand core is produced, and in each of integral sand core Individual end sets core print;It is final to obtain steam turbine valve casing casting after lower core, mould assembling, cast, cooling, shake out.
2. the casting method of the steam turbine valve casing casting according to claim 1, it is characterised in that:Ingate it is perpendicular The a diameter of φ 140mm, a diameter of φ 140mm of cross gate, a diameter of φ 120mm of sprue of straight ingate.
3. the casting method of the steam turbine valve casing casting according to claim 1, it is characterised in that:Open riser is rank Trapezoidal rising head, stairstepping rising head includes the first rising head and the second rising head for being connected with the first rising head, the second rising head also with upper valve casing The split of casting physical model is contacted, diameter big 200mm of the diameter than the second rising head of the first rising head.
4. the casting method of the steam turbine valve casing casting according to claim 1, it is characterised in that:From the casting of upper valve casing The underface of the farthest open riser of the flange face of part physical model split uses chill subregion.
CN201510722916.2A 2015-10-29 2015-10-29 The casting method of steam turbine valve casing casting CN105382203B (en)

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Application Number Priority Date Filing Date Title
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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
CN107042287B (en) * 2017-02-28 2018-11-23 共享铸钢有限公司 A kind of casting method of steam turbine high pressure main air valve casting
CN107008863B (en) * 2017-03-10 2018-11-23 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
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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CN101693282B (en) * 2009-10-22 2011-06-29 南阳市汇森精密仪器铸造有限公司 Method for producing voltage-bearing aluminum alloy tank body of ultra-high voltage switch by V-process
CN101920315A (en) * 2010-09-07 2010-12-22 江苏金石铸锻有限公司 Casting method of ZG1Cr13 of PFFAP35/52 valve body
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CN104190874B (en) * 2014-07-28 2016-05-25 兰州兰石集团有限公司 Super-low sulfur phosphorus HTHP valve body cast shaping process

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