CN109332587B - Sand mould for high nickel alloy butterfly valve body - Google Patents
Sand mould for high nickel alloy butterfly valve body Download PDFInfo
- Publication number
- CN109332587B CN109332587B CN201811508879.5A CN201811508879A CN109332587B CN 109332587 B CN109332587 B CN 109332587B CN 201811508879 A CN201811508879 A CN 201811508879A CN 109332587 B CN109332587 B CN 109332587B
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- China
- Prior art keywords
- core sand
- sand
- valve body
- forming block
- mould
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004576 sand Substances 0.000 title claims abstract description 115
- 229910000990 Ni alloy Inorganic materials 0.000 title claims abstract description 24
- 238000005266 casting Methods 0.000 claims abstract description 49
- 238000005336 cracking Methods 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 abstract description 16
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035553 feeding performance Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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
- B22C9/10—Cores; Manufacture or 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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a sand mould for a high nickel alloy butterfly valve body, which comprises a valve body upper mould, a valve body lower mould and core sand, wherein the core sand is molded by the core sand, the core sand mould comprises a core sand outer mould, an elastic compensation groove extending downwards from the upper end surface of the core sand is formed in the core sand, and the core sand mould further comprises a molding block for molding the elastic compensation groove; the forming block is in a square frustum pyramid shape with a small bottom and a large top, the forming block is provided with a through groove in the square frustum pyramid shape with the small top and the large bottom, the through groove and the forming block are coaxially arranged, and the cross section of the through groove and the cross section of the forming block are similar square polygons with parallel sides. The invention can increase the yielding property of core sand in the casting, so that the casting has better shrinkage performance inwards, the possibility of cracking due to insufficient feeding when the casting is cooled after casting is reduced, and the casting cast by adopting the die has better casting quality.
Description
Technical Field
The invention relates to the field of valve manufacturing, in particular to a sand mould for a high nickel alloy butterfly valve body.
Background
The large-caliber butterfly valve belongs to thin-wall parts, the valve body is large in caliber and thin in wall thickness, high-temperature molten steel flowing and feeding are not facilitated, the valve belongs to pressure-bearing parts, and high sealing performance requirements are met for castings, so that the casting technology of the large-caliber butterfly valve is always a casting difficult problem, and nickel-based alloys have high requirements on casting temperature, cooling speed, riser compensation, sand mold yielding property and the like.
The high nickel alloy butterfly valve body has the following difficulties in casting:
(1) The high nickel alloy is very sensitive to casting temperature, the too high casting temperature faces the problem of heat dissipation, and the too low casting temperature faces the problem of poor fluidity of molten steel;
(2) The high nickel alloy has higher requirement on riser compensation, and has better feeding function on the premise of ensuring cooling;
(3) When the high-nickel alloy is cooled, the high-nickel alloy is sensitive to temperature and is easy to crack, so that core sand and molding sand are required to have good yielding property, and the high-nickel alloy can yield in time when the casting is cooled and contracted, so that the casting is ensured not to be pulled apart.
Disclosure of Invention
The invention aims to solve the technical problem of providing the sand mould for the high nickel alloy butterfly valve body, which can increase the yielding property of core sand in castings and has better casting quality.
In order to solve the technical problems, the invention adopts the following technical scheme: the sand mould comprises a valve body upper mould, a valve body lower mould and core sand, wherein the core sand is molded by the core sand, the core sand mould comprises a core sand outer mould, an elastic compensation groove extending downwards from the upper end surface of the core sand is formed in the core sand, and the core sand mould further comprises a molding block for molding the elastic compensation groove;
the forming block is in a square frustum shape with a small bottom and a large top, a through groove in the shape of the square frustum with the small top and the large bottom is formed in the forming block, the through groove and the forming block are coaxially arranged, and the cross section of the through groove and the cross section of the forming block are similar square polygons with parallel sides;
when the core sand is manufactured, the lower end of the forming block is buried inwards into the upper end of the core sand, and the forming block and the core sand outer die are coaxially arranged, so that the annular elastic compensation groove with the trapezoid cross section is formed on the core sand.
Further, the lower end of the forming block is provided with a plurality of U-shaped notches which are distributed at intervals along the circumferential direction of the forming block and communicated with the through grooves.
Further, the outer peripheral surface of the core sand is provided with a plurality of anti-cracking rib forming grooves which are distributed at intervals along the circumferential direction of the core sand, and the anti-cracking rib forming grooves are strip-shaped and parallel to the circumferential direction of the core sand.
Further, the lower end face of the core sand is provided with a plurality of exhaust holes communicated with the elastic compensation grooves.
Further, the casting head of the sand mould for the high nickel alloy butterfly valve body is arranged on the upper mould of the valve body.
Further, the cross section of the forming block is regular octagon.
The beneficial effects of the invention are as follows:
according to the invention, the annular elastic compensation groove with the trapezoid cross section is formed in the core sand in consideration of the strength and elasticity of the core sand, so that the yielding property of the core sand in the casting can be increased, the crack of the casting due to insufficient yielding property of the core sand is reduced, the casting has better shrinkage performance inwards, the casting is ensured not to be pulled apart due to insufficient feeding when cooled after casting, and the high-nickel alloy butterfly valve cast by the die has better casting quality, and the casting difficulty of the butterfly valve body of the large-caliber high-nickel alloy butterfly valve is solved.
In addition, the forming block and the through groove are designed into the regular prismatic table shape, so that the die is convenient to take, the core sand manufactured by the forming block can be guaranteed to have good yielding property and stability, the strength and elasticity of the core sand manufactured by the forming block are proper, the rigidity of the inside of a casting is good, meanwhile, the sand in the elastic groove can be solidified together during die making, and the core sand can be reliably produced in a large scale.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a three-dimensional cross-sectional view of a core sand in an embodiment of the present invention.
FIG. 3 is a view showing a state of use of the core sand mold according to an embodiment of the present invention.
Fig. 4 is an exploded view of the structure of fig. 3.
Fig. 5 is a schematic perspective view of a molding block according to an embodiment of the present invention.
Fig. 6 is a schematic view of a core sand molded valve body blank in an embodiment of the invention.
The components in the drawings are marked as follows: 01 valve body upper die, 02 valve body lower die, 03 core sand, 031 elastic compensation groove, 032 positioning column, 033 positioning hole, 034 anti-cracking rib forming groove, 035 vent hole, 04 valve body blank, 1 core sand outer die, 2 forming block, 21 through groove, 22U notch.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
See fig. 1-6.
The invention relates to a sand mould for a high nickel alloy butterfly valve body, which comprises a valve body upper mould 01, a valve body lower mould 02 and core sand 03, wherein the core sand 03 is molded by the core sand, the core sand mould comprises a core sand outer mould 1, an elastic compensation groove 031 which extends downwards from the upper end surface of the core sand 03 is formed on the core sand 03, and the core sand mould also comprises a molding block 2 for molding the elastic compensation groove 031;
the forming block 2 is in a square frustum shape with a small bottom and a large top, the forming block 2 is provided with a through groove 21 in a square frustum shape with a small top and a large bottom, the through groove 21 and the forming block 2 are coaxially arranged, and the cross section of the through groove 21 and the cross section of the forming block 2 are similar square polygons with parallel sides;
when the core sand 03 is manufactured, the lower end of the molding block 2 is embedded inwards into the upper end of the core sand 03, and the molding block 2 and the core sand outer mold 1 are coaxially arranged, so that the annular elastic compensation groove 031 with the trapezoid cross section is molded on the core sand 03.
The invention considers the intensity and elasticity of the core sand, and the annular elastic compensation groove with the trapezoid cross section is arranged on the core sand, so that the yielding property of the core sand in the casting can be increased, the crack of the casting caused by insufficient yielding property of the core sand is reduced, the casting has better shrinkage performance inwards, the casting is ensured not to be pulled apart due to insufficient feeding when cooled after casting, in addition, the forming block and the through groove are designed into a regular prismatic table shape, the die taking is convenient, and the core sand can be ensured to have good yielding property and stability.
When special metal is cast by the traditional method, if the core sand is required to have good shrinkage performance, the common practice is to empty the middle of the core sand by using a tool after the core sand is manufactured, so that a relief space is convenient, the relief performance of the core sand can be increased to a certain extent, the possibility of cracking of the casting during cooling is reduced, but the method has the following defects:
(1) The strength of the core sand is possibly affected by manual emptying after molding, and the core sand is easily broken;
(2) The degree of hollowing is not well controlled, the hollowing is too much, the rigidity is easy to be insufficient, the casting is easy to be denatured, and the hollowing is too little, so that the elasticity is influenced;
(3) After the core sand is hollowed out, the sand in the core sand is in a loose state, and is possibly washed away by molten steel during casting, and brought into a casting, so that sand inclusion is caused, and the quality of the casting is affected;
the invention adopts the molding block to manufacture the core sand, so that all the problems listed above can be avoided, the manufactured core sand has proper strength and elasticity, the internal rigidity of the casting is good, and simultaneously, the sand in the elastic groove can be solidified together during molding, so that the core sand can be reliably produced in a large scale.
In an embodiment, the lower end of the molding block 2 is provided with a plurality of U-shaped notches 22 which are distributed at intervals along the circumferential direction of the molding block 2 and are communicated with the through groove 21. By the design, reinforcing ribs (namely sand in the space of the U-shaped notch) can be added to the core sand, so that the strength of the core sand is better ensured, and the core sand is not easy to loosen. Preferably, the plurality of U-shaped notches are uniformly distributed, and the effect is better.
In an embodiment, the outer circumferential surface of the core sand 03 is provided with a plurality of anti-cracking rib forming grooves 034 distributed at intervals along the circumferential direction of the core sand 03, and the anti-cracking rib forming grooves 034 are strip-shaped and parallel to the circumferential direction of the core sand 03. Because the large-caliber butterfly valve belongs to a thin-wall part, and the high nickel alloy has larger requirements on feeding, a plurality of anti-cracking ribs can be formed on the inner wall of the casting through the anti-cracking rib forming groove, so that after casting molding, the anti-cracking ribs are supported inside, the occurrence of cracks can be effectively reduced, and the quality of the casting is improved. Preferably, the plurality of anti-cracking rib forming grooves are uniformly distributed, and the effect is better.
In one embodiment, a casting head of the sand mould for the high nickel alloy butterfly valve body is arranged on the valve body upper mould 01. According to the invention, the valve body is subjected to horizontal casting, the casting head is arranged on the upper die of the valve body, so that garbage and slag inclusion can float upwards to the position of the casting head and the machining allowance position of the flange at the upper part, the internal quality of the casting is better, and better feeding performance is provided.
In one embodiment, the lower end surface of the core sand 03 is provided with a plurality of vent holes 035 communicated with the elastic compensation groove. By the design, molten steel can flow better, and the full flow of casting molten steel is ensured.
In one embodiment, the cross section of the molding block 2 is regular octagon. In the process of implementing the invention, the inventor finds that the compensation effect is better through the design.
In an embodiment, the center of the upper end surface of the core sand 03 is provided with a positioning column 032, and the edge of the lower end surface of the core sand 03 is provided with a positioning hole 033. The design has multiple positioning, ensures that the parting surface of the casting has no obvious joint mark. The core sand outer mold is generally divided into an upper part and a lower part, and is easy to release.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present invention, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application.
Claims (6)
1. The utility model provides a high nickel alloy sand mould for butterfly valve body, includes valve body upper die, valve body lower mould and core sand, core sand is moulded by core sand, core sand mould includes core sand external mold, its characterized in that: an elastic compensation groove extending downwards from the upper end surface of the core sand is formed in the core sand, and the core sand mould further comprises a forming block for forming the elastic compensation groove;
the forming block is in a square frustum shape with a small bottom and a large top, a through groove in the shape of the square frustum with the small top and the large bottom is formed in the forming block, the through groove and the forming block are coaxially arranged, and the cross section of the through groove and the cross section of the forming block are similar square polygons with parallel sides;
when the core sand is manufactured, the lower end of the forming block is buried inwards into the upper end of the core sand, and the forming block and the core sand outer die are coaxially arranged, so that the annular elastic compensation groove with the trapezoid cross section is formed on the core sand.
2. The sand mold for the high nickel alloy butterfly valve body according to claim 1, wherein: the lower end of the forming block is provided with a plurality of U-shaped notches which are distributed at intervals along the circumferential direction of the forming block and communicated with the through groove.
3. The sand mold for the high nickel alloy butterfly valve body according to claim 1 or 2, characterized in that: the outer peripheral surface of the core sand is provided with a plurality of anti-cracking rib forming grooves which are distributed at intervals along the circumferential direction of the core sand, and the anti-cracking rib forming grooves are strip-shaped and parallel to the circumferential direction of the core sand.
4. The sand mold for the high nickel alloy butterfly valve body according to claim 1 or 2, characterized in that: the lower end face of the core sand is provided with a plurality of exhaust holes communicated with the elastic compensation grooves.
5. The sand mold for the high nickel alloy butterfly valve body according to claim 1 or 2, characterized in that: and a casting head of the sand mould for the high nickel alloy butterfly valve body is arranged on the upper mould of the valve body.
6. The sand mold for the high nickel alloy butterfly valve body according to claim 1 or 2, characterized in that: the cross section of the forming block is regular octagon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508879.5A CN109332587B (en) | 2018-12-11 | 2018-12-11 | Sand mould for high nickel alloy butterfly valve body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508879.5A CN109332587B (en) | 2018-12-11 | 2018-12-11 | Sand mould for high nickel alloy butterfly valve body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109332587A CN109332587A (en) | 2019-02-15 |
| CN109332587B true CN109332587B (en) | 2024-03-08 |
Family
ID=65304184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811508879.5A Active CN109332587B (en) | 2018-12-11 | 2018-12-11 | Sand mould for high nickel alloy butterfly valve body |
Country Status (1)
| Country | Link |
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| CN (1) | CN109332587B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111331083B (en) * | 2020-04-08 | 2021-01-26 | 厦门市佳嘉达机械有限公司 | A mould for preventing foundry goods fracture |
| CN112387938A (en) * | 2020-09-17 | 2021-02-23 | 南通冠峰铸造有限公司 | Casting process of butterfly valve body |
| CN117444257B (en) * | 2023-12-26 | 2024-02-23 | 无锡斯考尔自动控制设备有限公司 | Bearing bracket turning mould of ball valve |
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| KR101382643B1 (en) * | 2013-03-15 | 2014-04-07 | 강성태 | Mold device of the main controls for hydraulic valve block |
| CN106513590A (en) * | 2017-01-09 | 2017-03-22 | 浙江欧冶达机械制造有限公司 | High-performance butterfly valve casting |
| CN107234213A (en) * | 2017-07-25 | 2017-10-10 | 苏州市鑫渭阀门有限公司 | The ceramic precision casting method of the high pressure stainless steel pump housing |
| CN107884258A (en) * | 2017-11-24 | 2018-04-06 | 四川共享铸造有限公司 | A kind of sand core strength test block mould |
| CN108339944A (en) * | 2018-04-27 | 2018-07-31 | 遵义江星机械模具有限公司 | For the molding casting mould of water pump vane |
| CN209157053U (en) * | 2018-12-11 | 2019-07-26 | 无锡斯考尔自动控制设备有限公司 | A kind of Langaloy butterfly valve body sand mold mould |
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2018
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974774A (en) * | 2012-12-10 | 2013-03-20 | 衡阳风顺车桥有限公司 | Production process of irregular ring type casting |
| KR101382643B1 (en) * | 2013-03-15 | 2014-04-07 | 강성태 | Mold device of the main controls for hydraulic valve block |
| 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 |
| CN106513590A (en) * | 2017-01-09 | 2017-03-22 | 浙江欧冶达机械制造有限公司 | High-performance butterfly valve casting |
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| CN107884258A (en) * | 2017-11-24 | 2018-04-06 | 四川共享铸造有限公司 | A kind of sand core strength test block mould |
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| CN109332587A (en) | 2019-02-15 |
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