CN112404354A - Casting method of volute casing casting for nuclear power station - Google Patents
Casting method of volute casing casting for nuclear power station Download PDFInfo
- Publication number
- CN112404354A CN112404354A CN202011294109.2A CN202011294109A CN112404354A CN 112404354 A CN112404354 A CN 112404354A CN 202011294109 A CN202011294109 A CN 202011294109A CN 112404354 A CN112404354 A CN 112404354A
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- mold
- sand
- casting
- nuclear power
- core
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Links
- 238000005266 casting Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 244000035744 Hura crepitans Species 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 8
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 230000007547 defect Effects 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- GUGLPELUECBSDK-UHFFFAOYSA-N phenol;urea Chemical compound NC(N)=O.OC1=CC=CC=C1 GUGLPELUECBSDK-UHFFFAOYSA-N 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 240000002329 Inga feuillei Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
- B22C9/082—Sprues, pouring cups
-
- 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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/108—Installation of cores
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The application discloses a method for casting a volute casing casting for a nuclear power station, which belongs to the technical field of casting of fluid conveying equipment and comprises the following steps: firstly, manufacturing a model according to the shape of a volute, wherein the model consists of an upper box-shaped plate die, a lower box-shaped plate die and a sand core sand box die; respectively manufacturing outer mold sand molds by using an upper box type plate mold and a lower box type plate mold, and manufacturing a loam core sand mold by using a loam core sand molding box mold; the middle part of an outer mold sand mold manufactured by the upper box-shaped plate mold is provided with a blind riser, and the circumferential direction of the blind riser is provided with 4 open risers; the outer mold sand mold manufactured by the lower box type plate mold is uniformly provided with 8 blind risers at intervals along the circumferential direction, the outer mold sand mold is also provided with an annular cross gate, and an inner gate is communicated between 6 blind risers and the annular cross gate; step two, the outer mold sand mold and the sand core sand mold are subjected to mould assembling and then casting is carried out; and step three, performing sand shakeout and cleaning after casting is finished. The casting product with compact interior and higher dimensional precision is obtained through the steps.
Description
Technical Field
The invention relates to the technical field of casting of fluid conveying equipment, in particular to a casting method of a volute casing casting for a nuclear power station.
Background
The volute casing casting is one of key parts of a safety injection pump used in a medium-pressure water reactor of a nuclear power station, and as shown in figures 1 and 2, the volute casing casting has the defects of complex shape and structure, uneven flow passage wall thickness, difficult casting forming, easy sand sticking, air holes, cracks, shrinkage cavities, sand inclusion and the like. Therefore, through long-term production practice, the applicant adopts a new casting process method to overcome the defects generated in the casting process of the volute and realize a casting product with compact interior and higher dimensional precision.
Disclosure of Invention
The invention aims to provide a method for casting a volute casing casting for a nuclear power station, which aims to solve the problems that in the prior art, casting forming is difficult, and the defects of sand adhesion, air holes, cracks, shrinkage cavities, sand inclusion and the like are easily caused.
In order to solve the above problems, the present invention provides the following technical solutions: a casting method of a volute casing casting for a nuclear power station comprises the following steps:
firstly, manufacturing a model according to the shape of a volute, wherein the model consists of an upper box-shaped plate die, a lower box-shaped plate die and a sand core sand box die; respectively manufacturing outer mold sand molds by using an upper box type plate mold and a lower box type plate mold, and manufacturing a loam core sand mold by using a loam core sand molding box mold; the middle part of an outer mold sand mold manufactured by the upper box-shaped plate mold is provided with a blind riser, and the circumferential direction of the blind riser is provided with 4 open risers; 8 blind risers and annular cross runners are uniformly arranged on an outer mold sand mold made of a lower box type plate mold at intervals along the circumferential direction, wherein an inner runner is communicated between the 6 blind risers and the annular cross runners;
step two, performing mould assembling on the outer mould sand mould and the sand core sand mould, respectively communicating the ceramic tubes with the annular cross gate and a blind riser in the middle of the outer mould sand mould manufactured by the upper mould plate mould, and then casting;
and step three, performing sand shakeout and cleaning after casting is finished.
The invention has the following working principle and beneficial effects: according to the casting head, the plurality of the casting heads are arranged, and after the riser molten steel is poured, the molten steel solidification direction can be solidified towards the riser direction from bottom to top, so that the volute casing casting body is guaranteed to obtain feeding of the riser molten steel in the solidification process, compact crystals are formed, and meanwhile, the riser can also collect impurities brought by molten steel scouring, the purity of the volute casing casting body is further improved, the impurity content is reduced, and the product quality is improved. And simultaneously, in the second step, two pouring systems are adopted, namely a ceramic pipe is communicated with an annular horizontal pouring gate, molten steel enters 6 blind risers through the annular horizontal pouring gate and an inner pouring gate, and in addition, the ceramic pipe is communicated with the blind riser of an outer mold sand mold manufactured by an upper box-shaped plate mold for casting.
Furthermore, the outer mold sand mold is made of alkaline phenolic resin sand, and the sand core sand mold is made of phenolic urea resin sand. The alkali phenolic resin sand and the phenol urea resin sand have the characteristics of smooth casting surface, clear edges and corners, high dimensional accuracy and the like.
Further, the sand core sand mold in the first step is placed into a mold baking kiln for baking before the mold assembling. In order to reduce the generation of a large amount of gas generated by the high-temperature reaction of the molten steel and the phenol urea resin in the molten steel contact process and prevent the inside of a casting from generating a large amount of air holes due to the fact that a large amount of gas enters the inside of the casting in the solidification process of the molten steel, the sand mold with the sand core is dried.
Further, when the sand core sand mold is baked, the mold baking kiln is heated from room temperature to 260 ℃ within 1 hour, the baking temperature is kept at 260 ℃, the baking time is 2 hours, then the mold baking kiln is heated from 260 ℃ to 310 ℃ within 0.5 hour, and then the sand core sand mold is taken out and naturally cooled.
Further, the outer mold sand mold and the sand core sand mold are polished before mould assembling. And the grinding can ensure that the sizes of the outer mold sand mold and the sand core sand mold are more accurate.
Furthermore, a chill is pre-embedded in the outer mold sand mold. The pre-buried chill aims to ensure that molten steel is sequentially solidified according to the requirements of process design and prevent crack defects from being generated.
Further, the outer mold sand mold and the sand core sand mold are both provided with a core skeleton, the core skeleton is wound with an air rope, and the air rope extends out of the outer mold sand mold and the sand core sand mold. The vent line can timely discharge a large amount of gas generated by the reaction of the molten steel and the resin, and prevent the gas from being involved in the molten steel to cause a large amount of gas hole defects.
And further, after the outer mold sand mold and the sand core sand mold are molded, the box sealing mud is placed along the circumferential direction of the parting surface. The box sealing mud can prevent molten steel from being ejected from a parting surface.
Drawings
FIG. 1 is a view of the construction of a volute casing casting;
FIG. 2 is a schematic diagram of an outer mold sand mold structure for manufacturing an upper box plate mold;
fig. 3 is a schematic diagram of an outer mold sand mold structure for manufacturing a lower box type plate mold.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a first open riser 1, a second blind riser 2, an air vent 3, a sixth riser 4, a core skeleton 5, a chill 6, an annular cross runner 7, a fourth blind riser 8, a fifth blind riser 9, an ingate 10 and a third blind riser 11.
The specific implementation process is as follows: a casting method of a volute casing casting for a nuclear power station comprises the following steps: step one, as shown in figure 1, manufacturing a model according to the shape of a volute, wherein the model consists of an upper box-shaped plate die, a lower box-shaped plate die and a sand core sand box die; respectively manufacturing outer mold sand molds by using an upper box type plate mold and a lower box type plate mold, manufacturing a loam core sand mold by using a loam core sand mold box mold, wherein the outer mold sand molds are made of alkaline phenolic resin sand, and the loam core sand molds are made of phenolic urea resin sand;
as shown in fig. 2 and 3, the middle part of an external mold sand mold manufactured by an upper box-type plate mold is provided with a second blind riser 2 (with the diameter of 160mm and the height of 240mm), the circumference of the external mold sand mold is provided with four first blind risers 1 (with the diameter of 110mm and the height of 165mm) and two sixth blind risers 4 (with the diameter of 80 mm); the outer mold sand mold manufactured by the lower box type plate mold is uniformly provided with 8 blind risers at intervals along the circumferential direction, the outer mold sand mold comprises four third blind risers 11 (the diameter is 120mm, the height is 300mm), two fourth blind risers 8 (the diameter is 140mm, the height is 300mm) and two fifth blind risers 9 (the diameter is 150mm, the height is 380mm), the outer mold sand mold is also provided with an annular cross gate 7, and an inner gate 10 is communicated between the 6 blind risers (the four fourth blind risers 8, the two fifth blind risers 9) and the annular cross gate 7;
step two, polishing the outer mold sand mold and the sand core sand mold before box assembling, placing the sand core sand mold into a mold baking kiln for baking before box assembling, raising the temperature of the mold baking kiln from room temperature to 260 ℃ within 1 hour, keeping the baking temperature at 260 ℃, keeping the baking time at 2 hours, then raising the temperature of the mold baking kiln from 260 ℃ to 310 ℃ within 0.5 hour, and then taking out the sand core sand mold for natural cooling; pre-burying chills 6 in an outer mold sand mold, wherein the outer mold sand mold and a loam core sand mold are respectively provided with a core skeleton 5 and vent holes 3, the core skeleton 5 is wound with a vent rope, the vent rope extends out of the outer mold sand mold and the loam core sand mold, the outer mold sand mold and the loam core sand mold are subjected to box closing, two layers of box sealing mud are placed along a circle of a cavity of a molding surface during the box closing, an open type pouring system is adopted for layered injection, namely bottom pouring and joint surface entering are adopted, a phi 50 ceramic pipe is adopted for the bottom pouring entering system to be connected with a second blind riser 2, a phi 70 ceramic pipe is adopted for the joint surface entering to be connected with an annular cross runner 7, and the cross runner is connected with 6 corresponding blind risers through 6 channels of inga;
and step three, performing sand shakeout and cleaning after casting is finished.
The plurality of risers are arranged, and after the riser molten steel is poured, the molten steel solidification direction can be solidified towards the riser from bottom to top, so that the volute casing body is guaranteed to be fed with the riser molten steel in the solidification process, compact crystals are formed, and meanwhile, the risers can also collect impurities caused by molten steel scouring, the purity of the volute casing casting body is further improved, the impurity content is reduced, and the product quality is improved. And simultaneously, in the second step, two pouring systems are adopted, namely, a ceramic pipe is communicated with an annular horizontal pouring gate 7, molten steel enters 6 blind risers through the annular horizontal pouring gate 7 and an inner pouring gate 10, and in addition, the ceramic pipe is communicated with a second blind riser 2 for pouring.
It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these should be construed as the scope of the invention, which will not affect the effect of the invention and the applicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A casting method of a volute casing casting for a nuclear power station is characterized by comprising the following steps: the method comprises the following steps:
firstly, manufacturing a model according to the shape of a volute, wherein the model consists of an upper box-shaped plate die, a lower box-shaped plate die and a sand core sand box die; respectively manufacturing outer mold sand molds by using an upper box type plate mold and a lower box type plate mold, and manufacturing a loam core sand mold by using a loam core sand molding box mold; the middle part of an outer mold sand mold manufactured by the upper box-shaped plate mold is provided with a blind riser, and the circumferential direction of the blind riser is provided with 4 open risers; 8 blind risers and annular cross runners are uniformly arranged on an outer mold sand mold made of a lower box type plate mold at intervals along the circumferential direction, wherein an inner runner is communicated between the 6 blind risers and the annular cross runners;
step two, performing mould assembling on the outer mould sand mould and the sand core sand mould, respectively communicating the ceramic tubes with the annular cross gate and a blind riser in the middle of the outer mould sand mould manufactured by the upper mould plate mould, and then casting;
and step three, performing sand shakeout and cleaning after casting is finished.
2. The method for casting the volute casing casting for the nuclear power plant as claimed in claim 1, wherein: the outer mold sand mold is made of alkaline phenolic resin sand, and the sand core sand mold is made of phenolic urea resin sand.
3. The method for casting the volute casing casting for the nuclear power plant as claimed in claim 2, wherein: and in the first step, the sand core sand mold is placed into a mold baking kiln for baking before box assembling.
4. The method for casting the volute casing casting for the nuclear power plant as claimed in claim 3, wherein: when the sand core sand mold is baked, the mold baking kiln is heated from room temperature to 260 ℃ within 1 hour, the baking temperature is kept at 260 ℃, the baking time is 2 hours, then the mold baking kiln is heated from 260 ℃ to 310 ℃ within 0.5 hour, and then the sand core sand mold is taken out and naturally cooled.
5. The method for casting the volute casing casting for the nuclear power plant as claimed in claim 4, wherein: and the outer mold sand mold and the sand core sand mold are polished before mould assembling.
6. The method for casting the volute casing casting for the nuclear power plant as claimed in claim 5, wherein: and a chill is pre-embedded in the outer mold sand mold.
7. The method for casting the volute casing casting for the nuclear power plant as claimed in claim 6, wherein: the outer mold sand mold and the loam core sand mold are both provided with a core skeleton, the core skeleton is wound with an air rope, and the air rope extends out of the outer mold sand mold and the loam core sand mold.
8. The method for casting the volute casing casting for the nuclear power plant as claimed in any one of claims 1 to 7, wherein: and after the outer mold sand mold and the sand core sand mold are molded, the box sealing mud is placed along the circumferential direction of the parting surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011294109.2A CN112404354A (en) | 2020-11-18 | 2020-11-18 | Casting method of volute casing casting for nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011294109.2A CN112404354A (en) | 2020-11-18 | 2020-11-18 | Casting method of volute casing casting for nuclear power station |
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| Publication Number | Publication Date |
|---|---|
| CN112404354A true CN112404354A (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011294109.2A Pending CN112404354A (en) | 2020-11-18 | 2020-11-18 | Casting method of volute casing casting for nuclear power station |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909348A (en) * | 2012-10-26 | 2013-02-06 | 上海华新合金有限公司 | Process for casting gearbox body of centrifugal compressor |
| CN103894550A (en) * | 2014-02-21 | 2014-07-02 | 杭州元鼎船舶设备有限公司 | Integrated copper alloy propeller hub casting equipment and special method thereof |
| 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 |
| CN110242781A (en) * | 2019-04-24 | 2019-09-17 | 福建大通互惠精密铸造有限公司 | Super duplex stainless steel 5A material butterfly valve body and manufacturing method |
| CN209811154U (en) * | 2019-03-19 | 2019-12-20 | 上海烟草机械新场铸造有限责任公司 | Casting system |
-
2020
- 2020-11-18 CN CN202011294109.2A patent/CN112404354A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909348A (en) * | 2012-10-26 | 2013-02-06 | 上海华新合金有限公司 | Process for casting gearbox body of centrifugal compressor |
| CN103894550A (en) * | 2014-02-21 | 2014-07-02 | 杭州元鼎船舶设备有限公司 | Integrated copper alloy propeller hub casting equipment and special method thereof |
| 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 |
| CN209811154U (en) * | 2019-03-19 | 2019-12-20 | 上海烟草机械新场铸造有限责任公司 | Casting system |
| CN110242781A (en) * | 2019-04-24 | 2019-09-17 | 福建大通互惠精密铸造有限公司 | Super duplex stainless steel 5A material butterfly valve body and manufacturing method |
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Application publication date: 20210226 |