CN106862500A - 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
- CN106862500A CN106862500A CN201710174800.9A CN201710174800A CN106862500A CN 106862500 A CN106862500 A CN 106862500A CN 201710174800 A CN201710174800 A CN 201710174800A CN 106862500 A CN106862500 A CN 106862500A
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- China
- Prior art keywords
- circle
- middle pressure
- pressure valve
- casting
- seating position
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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
-
- 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)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a kind of casting method 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, reasonably subsidized in the inner chamber on middle pressure valve shell casting top and outside setting；3）Centrality rising head and the outer wall subsidy of rational proportion are set；4）The thermal center circle size of the isolated thermal center of seating position is calculated, the amplification reserve feeding of whole circle is carried out to the increase allowance for calculating by way of boiling hot pitch circle；And use cooperatively chill in casting outer wall；5）After casting falling sand, the unnecessary allowance in preliminary removal seating position part；6）The machining removal remaining allowance of seating position.The present invention carries out feeding in seating position using unique whole circle amplification reserve, and sets chill in outer wall and change casting thermal field, allows in shrinkage porosite and is removed after moving, and solves valve seat feeding problem；Setting big rising head at top carries out overall 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 its size is big, complex-shaped, wall thickness variation
Greatly.The casting method of conventional the type casting have it is flat pour with upright casting two schemes, wherein the flat rising head removal for pouring scheme is more stranded
Difficulty, and casting quality is difficult guarantee；And there is isolated thermal center in traditional upright casting scheme seating position, it is impossible to effectively mended
, easily there is defect in contracting.Particularly middle pressure valve shell size is larger, and seating position casting shrinkage is difficult, casting easily occurs and lacks
The problem of falling into.
The content of the invention
The invention aims to solve above-mentioned technical problem, there is provided a kind of casting side of steam turbine middle pressure valve shell
Method.The method is easy to operate, and valve seat feeding problem is solved very well.The surface pores folder of conventional 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 is substantially reduced.
Realize the technical scheme is that：A kind of casting method of steam turbine middle pressure valve shell, it is characterised in that including such as
Lower step：
1）According to middle pressure valve shell detail drawing, the standard according to machine-finish allowance on its machined surface places rational roughing
Surplus；
2）By way of boiling hot pitch circle, reasonably subsidized in the inner chamber on middle pressure valve shell casting top and outside setting；
3）According to the shape and size of middle pressure valve shell admission end, centrality rising head and the outer wall subsidy of rational proportion are set；
4）Calculate the thermal center circle size of the isolated thermal center of seating position, the increase processing by way of boiling hot pitch circle to calculating
Surplus carries out the amplification reserve feeding of whole circle；And use cooperatively chill in casting outer wall；
5）After casting falling sand, the unnecessary allowance in preliminary removal seating position part；
6）The remaining allowance of seating position is removed by way of machining.
The step 2) in middle pressure valve shell casting top the boiling hot pitch circle in inner chamber subsidy, porch set one section it is straight
Section.
The step 2) in determine gradient according to 1.05~1.06 boiling hot pitch circle of coefficient.
The step 3) in the centrality rising head of rational proportion is set for the thermal center circular diameter of rising head is cast top thermal center
1.4 times of circular diameter.
The centrality rising head is the whole circle rising head that toroidal is set in cast top.
The step 4）In it is whole circle amplification reserve feeding be valve base cavity position set one protrusion whole circle rising head, make
Valve casing shrink when, by the whole circle riser feeding seating position for protruding, it is ensured that the consistency of seating position.
It is described it is whole circle amplification reserve feeding the step of be：
A. the oblique fragment position in valve bottom below seating position increases allowance by the way of boiling hot pitch circle；
B. valve cup bottom allowance and curved corner are set in seating position and valve bottom oblique fragment position junction；
C. set inscribed circle in seating position and determine inscribed circle diameter；
D. inner chamber core diameter is determined, the internal diameter size of diameter circle rising head whole with inner chamber is identical；
E. utilize tangent with inner chamber core circle with the inscribed circle diameter size identical of seating position circle, the diameter of two tangent circles it
With the external diameter for the whole circle rising head in inner chamber；The height of the whole circle rising head in inner chamber takes 0.3-0.8 times of inscribed circle diameter.
The step 4) in the thickness of chill be to increase 0.7 times of casting seating position equivalent thickness after allowance.
The step 5) in the mode that uses of the unnecessary allowance in preliminary removal seating position part be 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 bar.
Present invention has the advantages that：
1st, the present invention carries out feeding using unique whole circle amplification reserve in middle pressure valve shell inner chamber seating position instead of rising head, while
Outer wall sets iron chill shock chilling to change casting thermal field, the interior shifting of shrinkage porosite is allowed to remove, so as to be solved very well in the case of easy to operate
Determine valve seat feeding problem；
2nd, using upright casting process program and coordinate special running gate system to set big rising head at top to carry out overall feeding, effective solution
Determine the surface pores dreg defect serious problems of conventional middle pressure valve casting, the quality of middle pressure valve is obtained the change of matter, repair welding
Rate is substantially reduced.
3rd, subsidized by upper lumen and outside increase, good Feeding channel is formd on the top of valve casing, it is beneficial
In forming rational thermograde in process of setting.
Brief description of the drawings
Fig. 1 is that embodiment of the present invention inner chamber sets allowance schematic diagram；
Fig. 2 is that the embodiment of the present invention sets certain allowance schematic diagram；
Fig. 3 is the whole circle rising head that embodiment of the present invention top is set and subsidy schematic diagram；
Fig. 4 is the whole circle amplification reserve feeding setting schematic diagram of the embodiment of the present invention；
Fig. 5 is the increased allowance schematic diagram of embodiment of the present invention seating position；
Fig. 6 is that embodiment of the present invention valve seat external position places chill schematic diagram；
Fig. 7 is the partial schematic diagram that the embodiment of the present invention is removed by the way of vapour cuts.
Label in figure：1-roughing surplus, 2-inner chamber, 3-outside, 4-outer wall subsidy, 5-admission end, 6-rising head,
7-seating position, 8-increase allowance, 9-casting outer wall, 10-chill, 11-remaining allowance, 12-straight section,
13-valve cup bottom allowance, 14-unnecessary allowance, 15-burning torch, 16-subsidy, the oblique fragment position in 17-valve bottom, 18-
Inscribed circle, R-curved corner, D1-inscribed circle diameter, the whole circle rising head internal diameter in D2-inner chamber, the whole circle rising head external diameter in D3-inner chamber,
The whole circle riser height in H-inner chamber.
Specific embodiment：
As shown in Figures 1 to 7, a kind of casting method of steam turbine middle pressure valve shell, comprises the following steps：
1）According to middle pressure valve shell detail drawing, the standard according to machine-finish allowance on its machined surface places rational roughing
Surplus 1；
2）By way of boiling hot pitch circle, rational subsidy 16 is set in the inner chamber 2 on middle pressure valve shell casting top and outside 3；Press
The boiling hot pitch circle of coefficient according to 1.05~1.06 determines gradient, and sets one section of straight section 12 in porch, reduces and surplus is gone at this
Processing capacity；
3）According to the shape and size of middle pressure valve shell admission end 5, one whole circle rising head of toroidal is set in cast top, should
Rising head is that its thermal center circular diameter is 1.4 times of cast top thermal center circular diameter of centrality rising head 6, while setting outer wall subsidy
4；
4）The thermal center circle size that seating position 7 isolates thermal center is calculated, the increase for calculating is added by way of boiling hot pitch circle
Spare time amount 8 carries out the amplification reserve feeding of whole circle；And use cooperatively chill 10 in casting outer wall 9；The thickness of the chill is increase
0.7 times of casting seating position equivalent thickness after allowance.Whole circle amplification reserve feeding is to be set in valve base cavity position
A whole circle rising head for protrusion is put, makes valve casing when shrinking, by the whole circle riser feeding seating position for protruding, it is ensured that seating position
Consistency.
The specific implementation step of whole circle amplification reserve feeding is as follows：
A. the oblique fragment position 17 in valve bottom below valve seat increases allowance by the way of boiling hot pitch circle；
B. valve cup bottom allowance 13 and curved corner R are set in seating position 7 and valve the bottom oblique delivery position of fragment position 17；, this
Valve cup bottom allowance 13 is 15mm in example, and curved corner R segmental arc radiuses take 75mm；
C. set inscribed circle 8 in seating position and determine inscribed circle diameter D1；
D. inner chamber core diameter is determined, diameter circle rising head internal diameter D2 sizes whole with inner chamber are identical；
Casting method according to being used determines the size of inner chamber core, and core diameter in inner chamber takes 350mm in the present embodiment,
That is the whole circle rising head internal diameter D2 in inner chamber takes 350mm；
E. utilize tangent with inner chamber core circle with the inscribed circle diameter D1 sizes identical of seating position 7 circle, two tangent circles it is straight
Footpath sum is the outer diameter D 3 of the whole circle rising head in inner chamber；The height H of the whole circle rising head in inner chamber takes 0.3-0.8 times of inscribed circle diameter D1,
150mm is taken in the present embodiment.
5）After casting falling sand, the unnecessary allowance 14 in the part of seating position 7 is tentatively removed with the gas cutting of burning torch 15；Can also
Cut using plasma arc cutting, laser cutting, carbon arc air gouging and carbon arc air or electric arc digs any one in cutting bar and cuts.
6）The remaining allowance 11 of seating position is removed by way of machining.
The principle of the invention is：On the whole using the process program of upright casting, while being adopted in middle pressure valve shell inner chamber seating position
Carry out feeding with the whole circle amplification reserve of uniqueness, while set iron chill shock chilling changing casting thermal field in outer wall, allow in shrinkage porosite move with
Removal, so as to solve valve seat feeding problem very well in the case of easy to operate.
Claims (9)
1. a kind of casting method of steam turbine middle pressure valve shell, it is characterised in that comprise the following steps：
1）According to middle pressure valve shell detail drawing, the standard according to machine-finish allowance on its machined surface places rational roughing
Surplus；
2）By way of boiling hot pitch circle, reasonably subsidized in the inner chamber on middle pressure valve shell casting top and outside setting；
3）According to the shape and size of middle pressure valve shell admission end, centrality rising head and the outer wall subsidy of rational proportion are set；
4）Calculate the thermal center circle size of the isolated thermal center of seating position, the increase processing by way of boiling hot pitch circle to calculating
Surplus carries out the amplification reserve feeding of whole circle；And use cooperatively chill in casting outer wall；
5）After casting falling sand, the unnecessary allowance in preliminary removal seating position part；
6）The remaining allowance of seating position is removed by way of machining.
2. the casting method of steam turbine middle pressure valve shell according to claim 1, it is characterised in that：The step 2) in middle pressure
The subsidy of the boiling hot pitch circle in inner chamber on valve casing casting top, one section of straight section is set in porch.
3. the casting method of steam turbine middle pressure valve shell according to claim 1, it is characterised in that：The step 2) according to
1.05~1.06 boiling hot pitch circle of coefficient determines gradient.
4. the casting method of steam turbine middle pressure valve shell according to claim 1, it is characterised in that：The step 3) middle setting conjunction
The centrality rising head of reason ratio is 1.4 times of cast top thermal center circular diameter for the thermal center circular diameter of rising head.
5. according to claim 1 or 4 steam turbine middle pressure valve shell casting method, it is characterised in that：The centrality rising head
It is the whole circle rising head that toroidal is set in cast top.
6. the casting method of steam turbine middle pressure valve shell according to claim 1, it is characterised in that：The step 4）In it is whole circle put
Big surplus feeding is to set a whole circle rising head for protrusion in valve base cavity position, makes valve casing when shrinking, by the whole circle for protruding
Riser feeding seating position, it is ensured that the consistency of seating position.
7. according to claim 1 or 6 steam turbine middle pressure valve shell casting method, it is characterised in that：The whole circle amplifies remaining
Amount feeding the step of be：
A. the oblique fragment position in valve bottom below seating position increases allowance by the way of boiling hot pitch circle；
B. valve cup bottom allowance and curved corner are set in seating position and valve bottom oblique fragment position junction；
C. set inscribed circle in seating position and determine inscribed circle diameter；
D. inner chamber core diameter is determined, the internal diameter size of diameter circle rising head whole with inner chamber is identical；
E. utilize tangent with inner chamber core circle with the inscribed circle diameter size identical of seating position circle, the diameter of two tangent circles it
With the external diameter for the whole circle rising head in inner chamber；The height of the whole circle rising head in inner chamber takes 0.3-0.8 times of inscribed circle diameter.
8. the casting method of steam turbine middle pressure valve shell according to claim 1, it is characterised in that：The step 4) in chill
Thickness is 0.7 times of casting seating position equivalent thickness after increase allowance.
9. the casting method of steam turbine middle pressure valve shell according to claim 1, it is characterised in that：The step 5) in tentatively go
The mode used except the unnecessary allowance in seating position part for gas cutting, plasma arc cutting, laser cutting, carbon arc air gouging and
Carbon arc air cuts or electric arc plane cuts one of bar.
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 true CN106862500A (en) | 2017-06-20 |
| CN106862500B CN106862500B (en) | 2018-11-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN111531131A (en) * | 2020-05-29 | 2020-08-14 | 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 |
| CN114515817A (en) * | 2022-01-28 | 2022-05-20 | 洛阳中重铸锻有限责任公司 | Method for casting large plum blossom hole frame |
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| CN101081432A (en) * | 2007-06-04 | 2007-12-05 | 天乾（无锡）科技有限公司 | Method for founding main regulation valve body of steam turbine |
| CN103433434A (en) * | 2013-09-02 | 2013-12-11 | 山东墨龙石油机械股份有限公司 | Method for casting 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 |
| CN104907499A (en) * | 2015-04-24 | 2015-09-16 | 辽宁福鞍重工股份有限公司 | Heavy type gas turbine compressor exhaust cylinder casting process |
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| 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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| GB1577152A (en) * | 1976-10-18 | 1980-10-22 | Conval Penn Inc | Method of casting |
| CN101081432A (en) * | 2007-06-04 | 2007-12-05 | 天乾（无锡）科技有限公司 | Method for founding main regulation valve body of steam turbine |
| CN103433434A (en) * | 2013-09-02 | 2013-12-11 | 山东墨龙石油机械股份有限公司 | Method for casting valve body of flat gate valve |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN111531131A (en) * | 2020-05-29 | 2020-08-14 | 江苏恒立液压股份有限公司 | Casting sand core of plate valve and casting process of plate valve |
| 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 |
| CN114515817A (en) * | 2022-01-28 | 2022-05-20 | 洛阳中重铸锻有限责任公司 | Method for casting large plum blossom hole frame |
| 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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| CN106862500B (en) | 2018-11-09 |
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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 |
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