CN104001864B - Large-size horizontal axial-flow pump opposite opened diffuser casting method - Google Patents

Large-size horizontal axial-flow pump opposite opened diffuser casting method Download PDF

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Publication number
CN104001864B
CN104001864B CN201410164897.1A CN201410164897A CN104001864B CN 104001864 B CN104001864 B CN 104001864B CN 201410164897 A CN201410164897 A CN 201410164897A CN 104001864 B CN104001864 B CN 104001864B
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China
Prior art keywords
core
loose piece
diffuser
tub
embedding slot
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Expired - Fee Related
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CN201410164897.1A
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Chinese (zh)
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CN104001864A (en
Inventor
雷翠平
贺献峰
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Huangshi Xinxing Pipes Co Ltd
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Huangshi Xinxing Pipes Co Ltd
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Priority to CN201410164897.1A priority Critical patent/CN104001864B/en
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Abstract

A kind of large-size horizontal axial-flow pump opposite opened diffuser casting method, is characterized in that: include following steps: (1) adopts foam module to make first diffuser external mold and second diffuser external mold; (2) upper diffuser is designed to four cores, lower diffuser is designed to five cores, the general forming wood mold of special a set of 1#-9# core; (3) adopt upper and lower two halves diffuser external mold and general forming wood mold to manufacture sand mold, in core, place coke; (4) at the pre-buried thick-walled seamless steel pipes in diffuser oil pipe hole forming position, seamless steel pipe is assigned on foam external mold fixing; (5) on molding sand casting wall, twice special alcohol-base paint of ISOMOL type is brushed; (6) molten iron casting; (7) foundry goods at sand mold inside holding time controling more than 48 hours; The present invention adopts special general forming wood mold, places coke in core, extends the measures such as temperature retention time, has greatly saved the manufacturing cost of diffuser, improve product quality, mainly applied to the production of large-size horizontal axial pump vane body.

Description

Large-size horizontal axial-flow pump opposite opened diffuser casting method
Technical field
The present invention relates to Casting Technology to improve, especially a kind of large-size horizontal axial-flow pump opposite opened diffuser casting method.
Background technology
Its structure of opposite opened diffuser that large-size horizontal axial-flow pump uses is comparatively complicated, there is asymmetry, see Fig. 1, the main casting method that adopts is shaping at present, diffuser appearance and size is large, and main body wall thickness is thinner, and cylindrical shell and guide vane connecting portion easily crack, surface quality requirements is strict, and integral cast difficulty is larger.First casting method is to build sand mold, according to the design feature of opposite opened diffuser, be divided into upper and lower diffuser two parts, therefore need two cover external molds namely to go up diffuser external mold and lower diffuser external mold, and nine core shaping moulds, upper diffuser needs four cores, see Fig. 2, we are numbered 1#, 2#, 3#, 4# core successively clockwise, and lower diffuser needs five cores, see Fig. 3, our number consecutively is 5#, 6#, 7#, 8#, 9# core.Two groups of cores coordinate the i.e. upper and lower two halves diffuser of moulded by casting respectively with upper diffuser external mold and lower diffuser external mold, finally form one.Conventional method is: two external molds and nine cores all adopt wooden form, and nine cores are made up of nine cover core box wooden models, and processed complex, manufacture the wooden model cycle long, costly, and the oil pipe hole that diffuser is arranged cannot cast out, and embedded steel tube is difficult to again fix.
Summary of the invention
Object of the present invention will solve in existing diffuser casting method exactly, needs nine secondary core boxes, processed complex, manufacture wooden model is long in time limit, costly and oil pipe hole cannot cast out, the problems such as casting product quality is unstable, provide a kind of large-size horizontal axial-flow pump opposite opened diffuser casting method.
Concrete scheme of the present invention is: large-size horizontal axial-flow pump opposite opened diffuser casting method, is characterized in that: include following steps:
(1) foam module is adopted to make first diffuser external mold and second diffuser external mold;
(2) upper diffuser sand mold is designed to four cores, as Fig. 2, be respectively 1# core, 2# core, 3# core, 4# core, lower diffuser sand mold is designed to five cores, as Fig. 3, be respectively 5# core, 6# core, 7# core, 8# core, 9# core, the general forming wood mold of special a set of 1#-9# core, this wooden model has a secondary core tub, middle part offers the fan-shaped cavity of 1/7 diffuser, the both sides being positioned at fan-shaped cavity at core tub top have left and right loose piece embedding slot, interchangeable two rectangular loose pieces and two tubulature loose pieces are equipped with loose piece embedding slot, a right side wedge shape loose piece and a fan-shaped loose piece in right side and two fan-shaped loose pieces in the left side varied in size are equipped with the fan-shaped cavity of core tub, wherein, right side wedge shape loose piece and rectangular loose piece coordinate with core tub loose piece embedding slot and form 4# core forming cavity, the fan-shaped loose piece in right side and rectangular loose piece coordinate with core tub loose piece embedding slot and form 9# core forming cavity, the large fan-shaped loose piece in left side and rectangular loose piece coordinate with core tub and form 5# core forming cavity, the little fan-shaped loose piece in left side and rectangular loose piece coordinate with core tub and form 1# core forming cavity, a rectangular loose piece and a tubulature loose piece coordinate with core tub left and right loose piece embedding slot and form 2# or 6# core forming cavity, wherein rectangular loose piece is positioned at loose piece embedding slot on the left of core tub, tubulature loose piece is positioned at loose piece embedding slot on the right side of core tub, and 2# with 6# core forming cavity structure is identical, a rectangular loose piece and a tubulature loose piece coordinate with core tub left and right loose piece embedding slot and form 3# core forming cavity, wherein rectangular loose piece is positioned at loose piece embedding slot on the right side of core tub, tubulature loose piece is positioned at loose piece embedding slot on the left of core tub, and 2# with 6# core forming cavity structure is identical, two the tubulature loose pieces in left and right coordinate with core tub left and right loose piece embedding slot and form 7# core forming cavity, and a tubulature loose piece coordinates with loose piece embedding slot on the left of core tub and forms 8# core forming cavity,
(3) adopt upper and lower two halves diffuser external mold and general forming wood mold to manufacture sand mold, in all cores, place coke;
(4) at the pre-buried thick-walled seamless steel pipes in diffuser oil pipe hole forming position, seamless steel pipe is assigned on foam external mold fixing;
(5) on molding sand casting wall, brush twice special alcohol-base paint of ISOMOL type, THICKNESS CONTROL is at 0.6-0.8mm;
(6) molten iron casting;
(7) foundry goods at sand mold inside holding time controling more than 48 hours.
The present invention is in general forming wood mold, and the two ends of described rectangular loose piece are provided with transition hook, and there is corresponding hook groove at the loose piece embedding slot two ends, left and right at core tub top.
The two ends of the loose piece of tubulature described in the present invention are equipped with transition hook, and the medial surface of two tubulature loose pieces is provided with penstock installation cavity forming platform; The left and right loose piece embedding slot two ends at described sand mold tub top have corresponding hook groove.
Described in the present invention, right side wedge shape loose piece and the fan-shaped loose piece upper right corner separately, right side are provided with the boss embedding mutually with sand mold tub top right loose piece embedding slot.
The tub of core described in the present invention is surrounded by base plate and four blocks, front, rear, left and right side plate.
The present invention has following characteristics:
(1) have employed special general shaping core wooden model in the present invention, its design is ingenious, structure simplifies greatly, only need a secondary wooden core box, join outward eight simple loose pieces can produce diffuser casting needed for nine cores, wooden model is with short production cycle, and cost reduces greatly, and very convenient embedded steel tube, casting oil pipe hole;
(2) the present invention places coke in core, substantially increases core gas permeability and deformability, decreases crackle tendency;
(3) adopt the special alcohol-base paint brushing of ISOMOL type on sand mold face, prevent surperficial scab, improve surface quality of continuous castings;
(4) ensure that time controling is more than 48 hours, ensures the abundant slow cooling of casting mold, reduce crackle tendency.
Accompanying drawing explanation
The perspective view of Fig. 1 diffuser;
Fig. 2 is the layout drawing of upper diffuser four cores;
Fig. 3 is the layout drawing of lower diffuser five cores;
Fig. 4 is core tub perspective view;
Fig. 5 is the perspective view of rectangular loose piece;
Fig. 6 is tubulature loose piece perspective view;
Fig. 7 is right side wedge shape loose piece structural representation;
Fig. 8 is the fan-shaped loose piece structural representation in right side;
Fig. 9 is the large fan-shaped loose piece structural representation in left side;
Figure 10 is the little fan-shaped loose piece structural representation in left side;
Figure 11 is rectangular loose piece, tubulature loose piece coordinates with core tub and produces 2# sand core structure schematic diagram;
Figure 12 is rectangular loose piece, right side wedge shape loose piece coordinates with core tub and produces 4# sand core structure schematic diagram;
Figure 13 is rectangular loose piece, the fan-shaped loose piece in right side coordinates with core tub and produces 9# sand core structure schematic diagram;
Figure 14 is rectangular loose piece, the large fan-shaped loose piece in left side coordinates with core tub and produces 5# sand core structure schematic diagram;
Figure 15 is rectangular loose piece, the little fan-shaped loose piece in left side coordinates with core tub and produces 1# sand core structure schematic diagram;
Figure 16 is the front view of first diffuser external mold;
Figure 17 is the top view of first diffuser external mold;
Figure 18 is the front view of second diffuser external mold;
Figure 19 is the top view of second diffuser external mold;
In figure: 1-diffuser, 2-oil pipe hole, 3-1# core, 4-2# core, 5-oil pipe hole sand mold steel pipe, 6-3# core, 7-4# core, 8-5# core, 9-6# core, 10-7# core, 11-8# core, 12-9# core, 13-core tub, 14-base plate, 15-left plate, 16-front side board, 17-right side loose piece embedding slot, 18-right plate, the fan-shaped cavity of 19-1/7 diffuser, 20-left side loose piece embedding slot, 21-back side panel, 22-rectangular loose piece, 23-tubulature loose piece, 24-penstock installation cavity forming platform, 25-right side wedge shape loose piece, 26-boss, the fan-shaped loose piece in 27-right side, the large fan-shaped loose piece in 28-left side, the little fan-shaped loose piece in 29-left side, 30-4# sand mold forming cavity, 31-9# core forming cavity, 32-5# core forming cavity, 33-1# core forming cavity, 34-first diffuser external mold, 35-second diffuser external mold, 36-support pad.
Detailed description of the invention
The production method of casting large-size horizontal axial-flow pump opposite opened diffuser as shown in Figure 1, comprises the following steps:
(1) adopt foam module make first diffuser external mold 34(see Figure 16,17) and second diffuser external mold 35(see Figure 18,19);
(2) upper diffuser sand mold is designed to four cores, as Fig. 2, be respectively 1# core 3,2# core 4,3# core 6,4# core 7, lower diffuser sand mold is designed to five cores, as Fig. 3, be respectively 5# core 8,6# core 9,7# core 10,8# core 11,9# core 12, the general forming wood mold of special a set of 1#-9# core, this wooden model has a secondary core tub 13, see Fig. 4, middle part offers the fan-shaped cavity 19 of 1/7 diffuser, the both sides being positioned at fan-shaped cavity at core tub 13 top have left and right loose piece embedding slot 20, 17, be equipped with interchangeable two rectangular loose piece 22(see Fig. 5 with loose piece embedding slot) and two tubulature loose piece 23(see Fig. 6), a right side wedge shape loose piece 25 is equipped with the fan-shaped cavity of core tub 13, see Fig. 7, a right side fan-shaped loose piece 27(is see Fig. 8) and two fan-shaped loose pieces 28 in the left side varied in size, 29(is see 9, 10), wherein, right side wedge shape loose piece 25 and rectangular loose piece 22 coordinate with core tub loose piece embedding slot and form 4# core forming cavity, the fan-shaped loose piece 27 in right side and rectangular loose piece 22 coordinate with core tub loose piece embedding slot and form 9# core forming cavity, the large fan-shaped loose piece 28 in left side and rectangular loose piece 22 coordinate with core tub and form 5# core forming cavity, the little fan-shaped loose piece 29 in left side and rectangular loose piece 22 coordinate with core tub and form 1# core forming cavity, a rectangular loose piece 22 and a tubulature loose piece 23 coordinate with core tub left and right loose piece embedding slot and form 2# or 6# core forming cavity, wherein rectangular loose piece 22 is positioned at loose piece embedding slot 20 on the left of core tub, tubulature loose piece 23 is positioned at loose piece embedding slot 17 on the right side of core tub, and 2# with 6# core forming cavity structure is identical, a rectangular loose piece 22 and a tubulature loose piece 23 coordinate with core tub left and right loose piece embedding slot and form 3# core forming cavity, wherein rectangular loose piece 22 is positioned at loose piece embedding slot 17 on the right side of core tub, tubulature loose piece 23 is positioned at loose piece embedding slot 20 on the left of core tub, and 2# with 6# core forming cavity structure is identical, two the tubulature loose pieces 23 in left and right coordinate with core tub left and right loose piece embedding slot 20,17 and form 7# core forming cavity, and a tubulature loose piece 23 coordinates with loose piece embedding slot 20 on the left of core tub and forms 8# core forming cavity,
(3) adopt upper and lower two halves diffuser external mold 34,35 and general forming wood mold to manufacture sand mold, in core, place coke;
(4) at the pre-buried thick-walled seamless steel pipes of diffuser oil pipe hole 2 shaping position, seamless steel pipe is assigned on foam external mold fixing;
(5) on molding sand casting wall, brush twice special alcohol-base paint of ISOMOL type, THICKNESS CONTROL is at 0.6-0.8mm;
(6) molten iron casting;
(7) foundry goods at sand mold inside holding time controling more than 48 hours.
Described in the present embodiment, the two ends of rectangular loose piece 22 are provided with transition hook, and there is corresponding hook groove at left and right loose piece embedding slot 20,17 two ends at core tub 13 top.
The two ends of the loose piece of tubulature described in the present embodiment 23 are equipped with transition hook, and the medial surface of two tubulature loose pieces is provided with penstock installation cavity forming platform 24; Left and right loose piece embedding slot 20,17 two ends at described sand mold tub 13 top have corresponding hook groove.
The wedge shape loose piece of right side described in the present embodiment 25 and the respective upper right corner of the fan-shaped loose piece in right side 27 are provided with the boss 26 embedding mutually with sand mold tub 13 top right loose piece embedding slot 17.
Fan-shaped loose piece 28 on the left of two sizes described in the present embodiment, the 29 respective upper left corners are provided with the boss 26 embedding mutually with core tub 13 left side loose piece embedding slot 20.
The tub of core described in the present embodiment 13 is surrounded, see Fig. 4 by base plate 14 and four blocks, front, rear, left and right side plate 16,21,15,18.

Claims (6)

1. large-size horizontal axial-flow pump opposite opened diffuser casting method, is characterized in that: include following steps:
(1) foam module is adopted to make first diffuser external mold and second diffuser external mold;
(2) upper diffuser sand mold is designed to four cores, is respectively 1# core, 2# core, 3# core, 4# core, lower diffuser sand mold is designed to five cores, be respectively 5# core, 6# core, 7# core, 8# core, 9# core, the general forming wood mold of special a set of 1#-9# core, this wooden model has a secondary core tub, middle part offers the fan-shaped cavity of 1/7 diffuser, the both sides being positioned at fan-shaped cavity at core tub top have left and right loose piece embedding slot, interchangeable two rectangular loose pieces and two tubulature loose pieces are equipped with loose piece embedding slot, a right side wedge shape loose piece and a fan-shaped loose piece in right side and two fan-shaped loose pieces in the left side varied in size are equipped with the fan-shaped cavity of core tub, wherein, right side wedge shape loose piece and rectangular loose piece coordinate with core tub loose piece embedding slot and form 4# core forming cavity, the fan-shaped loose piece in right side and rectangular loose piece coordinate with core tub loose piece embedding slot and form 9# core forming cavity, the large fan-shaped loose piece in left side and rectangular loose piece coordinate with core tub and form 5# core forming cavity, the little fan-shaped loose piece in left side and rectangular loose piece coordinate with core tub and form 1# core forming cavity, a rectangular loose piece and a tubulature loose piece coordinate with core tub left and right loose piece embedding slot and form 2# or 6# core forming cavity, wherein rectangular loose piece is positioned at loose piece embedding slot on the left of core tub, tubulature loose piece is positioned at loose piece embedding slot on the right side of core tub, and 2# with 6# core forming cavity structure is identical, a rectangular loose piece and a tubulature loose piece coordinate with core tub left and right loose piece embedding slot and form 3# core forming cavity, wherein rectangular loose piece is positioned at loose piece embedding slot on the right side of core tub, tubulature loose piece is positioned at loose piece embedding slot on the left of core tub, and 2# with 6# core forming cavity structure is identical, two the tubulature loose pieces in left and right coordinate with core tub left and right loose piece embedding slot and form 7# core forming cavity, and a tubulature loose piece coordinates with loose piece embedding slot on the left of core tub and forms 8# core forming cavity,
(3) adopt upper and lower two halves diffuser external mold and general forming wood mold to manufacture sand mold, in all cores, place coke;
(4) at the pre-buried thick-walled seamless steel pipes in diffuser oil pipe hole forming position, seamless steel pipe is assigned on foam external mold fixing;
(5) on molding sand casting wall, brush twice special alcohol-base paint of ISOMOL type, THICKNESS CONTROL is at 0.6-0.8mm;
(6) molten iron casting;
(7) foundry goods at sand mold inside holding time controling more than 48 hours.
2. large-size horizontal axial-flow pump opposite opened diffuser casting method according to claim 1, is characterized in that: the two ends of described rectangular loose piece are provided with transition hook, and there is corresponding hook groove at the loose piece embedding slot two ends, left and right at core tub top.
3. large-size horizontal axial-flow pump opposite opened diffuser casting method according to claim 1, it is characterized in that: the two ends of described tubulature loose piece are equipped with transition hook, and the medial surface of two tubulature loose pieces is provided with penstock installation cavity forming platform; The left and right loose piece embedding slot two ends at described sand mold tub top have corresponding hook groove.
4. large-size horizontal axial-flow pump opposite opened diffuser casting method according to claim 1, is characterized in that: the fan-shaped loose piece of described right side wedge shape loose piece and the right side upper right corner is separately provided with the boss embedding mutually with sand mold tub top right loose piece embedding slot.
5. large-size horizontal axial-flow pump opposite opened diffuser casting method according to claim 1, is characterized in that: the fan-shaped loose piece upper left corner separately, described two left sides is provided with the boss embedding mutually with core tub left side loose piece embedding slot.
6. large-size horizontal axial-flow pump opposite opened diffuser casting method according to claim 1, is characterized in that: described core tub is surrounded by base plate and four blocks, front, rear, left and right side plate.
CN201410164897.1A 2014-04-23 2014-04-23 Large-size horizontal axial-flow pump opposite opened diffuser casting method Expired - Fee Related CN104001864B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110014120A (en) * 2019-05-16 2019-07-16 芜湖久弘重工股份有限公司 A kind of casting and molding method that the wood that disappears combines
CN111185589A (en) * 2020-02-25 2020-05-22 无锡市灵通铸造有限公司 Casting process of duplex stainless steel guide blade body

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GB881052A (en) * 1959-04-15 1961-11-01 Clark Equipment Co Improvements in or relating to methods and apparatus for moulding foundry cores
CN101249546A (en) * 2008-04-07 2008-08-27 齐齐哈尔轨道交通装备有限责任公司 Train carriage bolster integral core box group, bolster sand core and its processing method
CN201295736Y (en) * 2008-11-20 2009-08-26 天津达祥精密工业有限公司 Pulling block structure of turbo-housing channel box core
CN101773982A (en) * 2010-02-01 2010-07-14 上海交大南洋机电科技有限公司 Fluid coupling pump impeller/turbine casting model
CN101786142A (en) * 2010-01-12 2010-07-28 大连船用推进器有限公司 Cylindrical coordinate parallel casting method of large-size pitch-adjustable propeller blade
CN203437596U (en) * 2013-07-15 2014-02-19 广州广一泵业有限公司 Laminating sand core and casting mold for forming pump impeller and mold for forming laminating sand core insert

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JP2000288688A (en) * 1999-04-05 2000-10-17 Kubota Corp Method for casting pump casing having guide vane

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB881052A (en) * 1959-04-15 1961-11-01 Clark Equipment Co Improvements in or relating to methods and apparatus for moulding foundry cores
CN101249546A (en) * 2008-04-07 2008-08-27 齐齐哈尔轨道交通装备有限责任公司 Train carriage bolster integral core box group, bolster sand core and its processing method
CN201295736Y (en) * 2008-11-20 2009-08-26 天津达祥精密工业有限公司 Pulling block structure of turbo-housing channel box core
CN101786142A (en) * 2010-01-12 2010-07-28 大连船用推进器有限公司 Cylindrical coordinate parallel casting method of large-size pitch-adjustable propeller blade
CN101773982A (en) * 2010-02-01 2010-07-14 上海交大南洋机电科技有限公司 Fluid coupling pump impeller/turbine casting model
CN203437596U (en) * 2013-07-15 2014-02-19 广州广一泵业有限公司 Laminating sand core and casting mold for forming pump impeller and mold for forming laminating sand core insert

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