CN106862500B - A kind of casting method of steam turbine middle pressure valve shell - Google Patents
A kind of casting method of steam turbine middle pressure valve shell Download PDFInfo
- Publication number
- CN106862500B CN106862500B CN201710174800.9A CN201710174800A CN106862500B CN 106862500 B CN106862500 B CN 106862500B CN 201710174800 A CN201710174800 A CN 201710174800A CN 106862500 B CN106862500 B CN 106862500B
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- casting
- circle
- seating position
- middle pressure
- allowance
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supercharger (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of casting methods of steam turbine middle pressure valve shell, including step：1）According to middle pressure valve shell detail drawing, rational roughing surplus is placed；2）By way of boiling hot pitch circle, the inner cavity on middle pressure valve shell casting top and the rational subsidy of external setting；3）Centrality riser and the outer wall subsidy of rational proportion are set；4）The thermal center circle size that seating position isolates thermal center is calculated, whole circle amplification reserve feeding is carried out to calculated increase allowance by way of boiling hot pitch circle；And it is used cooperatively chill in casting outer wall；5）It is preliminary to remove the extra allowance in seating position part after casting falling sand；6）The mechanical processing removal remaining allowance of seating position.The present invention uses unique whole circle amplification reserve to carry out feeding in seating position, and changes casting thermal field in outer wall setting chill, is removed after allowing shrinkage porosite is interior to move, solves valve seat feeding problem；Big riser is set at top and carries out whole feeding, solves the problems, such as casting surface defect.
Description
Technical field
The present invention relates to the casting of steam turbine middle pressure valve shell casting, specifically a kind of casting of steam turbine middle pressure valve shell
Method.
Background technology
Steam turbine middle pressure valve shell is one of casting important in steam-turbine unit, and size is big, complex-shaped, wall thickness variation
Greatly.The casting method of previous the type casting have it is flat pour with upright casting two schemes, wherein the flat riser removal for pouring scheme is more tired
Difficulty, and casting quality is not easy to ensure；And there is isolated thermal center in traditional upright casting scheme seating position, cannot effectively be mended
, easily there is defect in contracting.Especially middle pressure valve shell size is larger, and seating position casting shrinkage is difficult, casting and forming easily occurs and lacks
The problem of falling into.
Invention content
The purpose of the present invention is to solve above-mentioned technical problems, provide a kind of casting side of steam turbine middle pressure valve shell
Method.This method is easy to operate, solves valve seat feeding problem very well.The surface pores folder of previous middle pressure valve casting is overcome simultaneously
Slag defect serious problems, make the quality of middle pressure valve obtain the change of matter, and repair welding rate substantially reduces.
Realize the technical scheme is that：A kind of casting method of steam turbine middle pressure valve shell, which is characterized in that including such as
Lower step：
1）It is rational thick according to the placement of the standard of machine-finish allowance on its machined surface according to middle pressure valve shell detail drawing
Allowance；
2）By way of boiling hot pitch circle, the inner cavity on middle pressure valve shell casting top and the rational subsidy of external setting；
3）According to the shape and size of middle pressure valve shell admission end, centrality riser and the outer wall subsidy of rational proportion are set；
4）The thermal center circle size that seating position isolates thermal center is calculated, to calculated increase by way of boiling hot pitch circle
Allowance carries out whole circle amplification reserve feeding；And it is used cooperatively chill in casting outer wall；
5）It is preliminary to remove the extra allowance in seating position part after casting falling sand；
6）The remaining allowance of seating position is removed by way of mechanical processing.
In the subsidy of the boiling hot pitch circle in inner cavity on middle pressure valve shell casting top in the step 2), it is arranged one section directly in inlet
Section.
In the step 2) gradient is determined according to 1.05~1.06 boiling hot pitch circle of coefficient.
It is cast top thermal center that the centrality riser of setting rational proportion, which is the thermal center circular diameter of riser, in the step 3)
1.4 times of circular diameter.
The centrality riser is the whole circle riser that annulus shape is arranged in cast top.
The step 4）In it is whole circle amplification reserve feeding be valve base cavity position be arranged one protrusion whole circle riser, make
Valve casing, by the whole circle riser feeding seating position protruded, ensures the consistency of seating position when shrinking.
The step of whole circle amplification reserve feeding is：
A. increase allowance by the way of boiling hot pitch circle in the seating position oblique fragment position in valve bottom below；
B. in the oblique fragment position junction setting valve cup bottom allowance of seating position and valve bottom and curved corner；
C. it sets inscribed circle in seating position and determines inscribed circle diameter；
D. determine that inner cavity sand core diameter, the diameter are identical as the whole circle internal diameter size of riser in inner cavity；
E. utilize circle identical with the inscribed circle diameter size of seating position and inner cavity sand core to justify tangent, two tangent circles it is straight
The sum of diameter is the outer diameter of the whole circle riser in inner cavity；The height of the whole circle riser in inner cavity takes 0.3-0.8 times of inscribed circle diameter.
The thickness of chill is to increase after allowance 0.7 times of casting seating position equivalent thickness in the step 4).
The mode that the extra allowance in seating position part uses tentatively is removed in the step 5) as gas cutting, plasma
Arc cutting, laser cutting, carbon arc air gouging and the cutting of carbon arc air or electric arc plane cut one of item.
Present invention has the advantages that：
1, the present invention replaces riser to carry out feeding in middle pressure valve shell inner cavity seating position using unique whole circle amplification reserve, together
When in outer wall iron chill shock chilling is set to change casting thermal field, allow in shrinkage porosite and move to remove, in the case of easy to operate very
Solves valve seat feeding problem well；
2, using the process program of upright casting and coordinate special running gate system that big riser is arranged at top to carry out whole feeding, have
Effect solves the surface pores dreg defect serious problems of previous middle pressure valve casting, and the quality of middle pressure valve is made to obtain the change of matter,
Repair welding rate substantially reduces.
3, beneficial by the way that in upper lumen and external increase subsidy, good Feeding channel is formd on the top of valve casing
In forming rational temperature gradient in process of setting.
Description of the drawings
Fig. 1 is that allowance schematic diagram is arranged in inner cavity of the embodiment of the present invention；
Fig. 2 is that certain allowance schematic diagram is arranged in the embodiment of the present invention；
Fig. 3 is the whole circle riser being arranged at the top of the embodiment of the present invention and subsidy schematic diagram；
Fig. 4 is that the whole circle amplification reserve feeding of the embodiment of the present invention sets schematic diagram；
Fig. 5 is the increased allowance schematic diagram of seating position of the embodiment of the present invention；
Fig. 6 is that valve seat external position of the embodiment of the present invention places chill schematic diagram；
Fig. 7 is the partial schematic diagram that the embodiment of the present invention is removed by the way of gas cutting.
Figure label：1-roughing surplus, 2-inner cavities, 3-is external, the subsidy of 4-outer walls, 5-admission ends, 6-riser,
7-seating positions, 8-increase allowance, 9-casting outer walls, 10-chills, 11-remaining allowance, 12-straight sections,
13-valve cup bottom allowance, 14-extra allowance, 15-burning torches, 16-subsidies, the 17-oblique fragment positions in valve bottom, 18-
Inscribed circle, R-curved corner, D1-inscribed circle diameter, the whole circle riser internal diameter in D2-inner cavity, the whole circle riser outer diameter in D3-inner cavity,
The whole circle riser height in H-inner cavity.
Specific implementation mode：
As shown in Figures 1 to 7, a kind of casting method of steam turbine middle pressure valve shell, includes the following steps：
1）It is rational thick according to the placement of the standard of machine-finish allowance on its machined surface according to middle pressure valve shell detail drawing
Allowance 1；
2）By way of boiling hot pitch circle, the inner cavity 2 on middle pressure valve shell casting top and the rational subsidy of 3 setting of outside
16；Gradient is determined according to the boiling hot pitch circle of 1.05~1.06 coefficient, and one section of straight section 12 is set in inlet, is reduced more than being gone at this
The processing capacity of amount；
3）According to the shape and size of middle pressure valve shell admission end 5, the whole circle that annulus shape is arranged in cast top emits
Mouthful, which is 1.4 times of the centrality riser 6 that its thermal center circular diameter is cast top thermal center circular diameter, while being arranged outer
Wall subsidy 4；
4）The thermal center circle size that seating position 7 isolates thermal center is calculated, to calculated increasing by way of boiling hot pitch circle
Allowance 8 is added to carry out whole circle amplification reserve feeding；And it is used cooperatively chill 10 in casting outer wall 9；The thickness of the chill is
0.7 times of casting seating position equivalent thickness after increase allowance.The whole circle amplification reserve feeding is in valve base cavity position
The whole circle riser for installing a protrusion makes valve casing when shrinking, and by the whole circle riser feeding seating position protruded, ensures valve seat
The consistency of position.
The specific implementation step of the whole circle amplification reserve feeding is as follows：
A. increase allowance by the way of boiling hot pitch circle in the oblique fragment position in valve seat valve bottom below 17；
B. in oblique 17 delivery position of the fragment position setting valve cup bottom allowance 13 of seating position 7 and valve bottom and curved corner
R；, valve cup bottom allowance 13 is 15mm in this example, and curved corner R segmental arc radiuses take 75mm；
C. it sets inscribed circle 8 in seating position and determines inscribed circle diameter D1；
D. determine that inner cavity sand core diameter, the diameter are identical as the whole circle riser internal diameter D2 sizes in inner cavity；
The size of inner cavity sand core is determined according to used casting method, sand core diameter in inner cavity takes in the present embodiment
The whole circle riser internal diameter D2 of 350mm, i.e. inner cavity takes 350mm；
E. circle identical with the inscribed circle diameter D1 sizes of seating position 7 is utilized to justify tangent, two tangent circles with inner cavity sand core
The sum of diameter for the whole circle riser in inner cavity outer diameter D 3；The height H of the whole circle riser in inner cavity takes the 0.3-0.8 of inscribed circle diameter D1
Times, 150mm is taken in the present embodiment.
5）After casting falling sand, the extra allowance 14 in 7 part of seating position is tentatively removed with 15 gas cutting of burning torch；It can also
Any type in item is cut using the cutting of plasma arc cutting, laser cutting, carbon arc air gouging and carbon arc air or electric arc plane to cut.
6）The remaining allowance of seating position 11 is removed by way of mechanical processing.
The principle of the invention is：The process program of upright casting is used on the whole, while being adopted in middle pressure valve shell inner cavity seating position
Carries out feeding with unique whole circle amplification reserve, while iron chill shock chilling is set to change casting thermal field in outer wall, allow the interior shifting of shrinkage porosite with
Removal, to solve valve seat feeding problem very well in the case of easy to operate.
Claims (1)
1. a kind of casting method of steam turbine middle pressure valve shell, which is characterized in that include the following steps：
1）According to middle pressure valve shell detail drawing, rational roughing is placed according to the standard of machine-finish allowance on its machined surface
Surplus；
2）By way of boiling hot pitch circle, the inner cavity on middle pressure valve shell casting top and the rational subsidy of external setting；
3）According to the shape and size of middle pressure valve shell admission end, centrality riser and the outer wall subsidy of rational proportion are set；
4）The thermal center circle size that seating position isolates thermal center is calculated, calculated increase is processed by way of boiling hot pitch circle
Surplus carries out whole circle amplification reserve feeding；And it is used cooperatively chill in casting outer wall；
The step of whole circle amplification reserve feeding is：
A. increase allowance by the way of boiling hot pitch circle in the seating position oblique fragment position in valve bottom below；
B. in the oblique fragment position junction setting valve cup bottom allowance of seating position and valve bottom and curved corner；
C. it sets inscribed circle in seating position and determines inscribed circle diameter；
D. determine that inner cavity sand core diameter, the diameter are identical as the whole circle internal diameter size of riser in inner cavity；
E. utilize circle identical with the inscribed circle diameter size of seating position and inner cavity sand core to justify tangent, the diameters of two tangent circles it
With the outer diameter for the whole circle riser in inner cavity；The height of the whole circle riser in inner cavity takes 0.3-0.8 times of inscribed circle diameter；
5）It is preliminary to remove the extra allowance in seating position part after casting falling sand；
6）The remaining allowance of seating position is removed by way of mechanical processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174800.9A CN106862500B (en) | 2017-03-22 | 2017-03-22 | A kind of casting method of steam turbine middle pressure valve shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174800.9A CN106862500B (en) | 2017-03-22 | 2017-03-22 | A kind of casting method of steam turbine middle pressure valve shell |
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| CN106862500A CN106862500A (en) | 2017-06-20 |
| CN106862500B true CN106862500B (en) | 2018-11-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109261895A (en) * | 2018-11-23 | 2019-01-25 | 安徽应流铸业有限公司 | A kind of production and processing method of stainless steel body |
| CN109175232A (en) * | 2018-11-23 | 2019-01-11 | 安徽应流铸业有限公司 | A kind of thin-walled pressure-bearing casting lost wax casting technique |
| CN110116190A (en) * | 2019-04-25 | 2019-08-13 | 河南广瑞汽车部件股份有限公司 | A kind of process and optimization structure of elimination diverter valve body side cover shrinkage porosite |
| CN111531131B (en) * | 2020-05-29 | 2022-05-31 | 江苏恒立液压股份有限公司 | Casting sand core of plate valve and casting process of plate valve |
| CN114029454A (en) * | 2021-11-05 | 2022-02-11 | 西峡县众德汽车部件有限公司 | Casting method for solving shrinkage porosity of casting |
| CN114515817B (en) * | 2022-01-28 | 2023-11-10 | 洛阳中重铸锻有限责任公司 | Casting method of large plum blossom hole frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4048709A (en) * | 1976-10-18 | 1977-09-20 | Conval-Penn, Inc. | Method of casting |
| CN100467166C (en) * | 2007-06-04 | 2009-03-11 | 天乾（无锡）科技有限公司 | Method for founding main regulation valve body of steam turbine |
| CN103433434B (en) * | 2013-09-02 | 2015-11-18 | 山东墨龙石油机械股份有限公司 | The casting method of valve body of flat gate valve |
| CN104646635A (en) * | 2015-01-29 | 2015-05-27 | 夏平桂 | Casting method for valve body of expansion valve |
| CN104907499B (en) * | 2015-04-24 | 2016-08-17 | 辽宁福鞍重工股份有限公司 | A kind of heavy combustion engine compressor air-discharging cylinder casting technique |
| CN205437048U (en) * | 2016-03-25 | 2016-08-10 | 宁夏朗盛精密制造技术有限公司 | Triple offset butterfly valve valve body casting mould |
| CN205914709U (en) * | 2016-08-24 | 2017-02-01 | 宁夏朗盛精密制造技术有限公司 | Two disjunctor casting system of case |
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Effective date of registration: 20220519 Address after: 618000 No. 666, Jinsha Jiangxi Road, Deyang City, Sichuan Province Patentee after: Deyang Guangda Dongqi New Material Co.,Ltd. Address before: 618000 Jinsha Jiangxi Road, high tech Industrial Park, Deyang, Sichuan, 666 Patentee before: DONGFANG TURBINE Co.,Ltd. DTC |