CN113523192A - Casting method of ball valve body - Google Patents
Casting method of ball valve body Download PDFInfo
- Publication number
- CN113523192A CN113523192A CN202110692457.3A CN202110692457A CN113523192A CN 113523192 A CN113523192 A CN 113523192A CN 202110692457 A CN202110692457 A CN 202110692457A CN 113523192 A CN113523192 A CN 113523192A
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- riser
- valve body
- shaft
- casting
- ball valve
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- 238000005266 casting Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 238000009413 insulation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000003031 feeding effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- 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
- B22C9/22—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 invention belongs to the technical field of casting, and particularly relates to a method for casting a ball valve body.A riser is arranged in a hole of a valve body casting, and a riser neck is opposite to the position of a heat joint of a shaft of the valve body, so that the problems of round shrinkage of the heat joint at the intersection of the shaft and a valve body main body, riser cutting and gouging grinding difficulty are solved, the external structure of the valve body casting does not need cutting and grinding treatment, the operation procedures are reduced, and the production period is shortened; the riser is provided with a step riser, so that the problem of the limited space size and the large riser height-diameter ratio is solved, and the riser feeding gradient and the good channel are ensured; meanwhile, the periphery of the shaft is provided with a chilling device, so that the effects of quickly and simultaneously solidifying the surface of the shaft and quickly reducing the modulus are achieved; the production period can be obviously shortened and the casting quality can be improved by adopting the measures.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a casting method of a ball valve body.
Background
A hydroelectric ball valve casting with a shaft belongs to matched parts in the hydroelectric industry, mainly comprises a ball valve main body and shafts, wherein the length of the shafts on two sides of the ball valve main body is generally about 5000mm, the diameter of the shafts is about 1000mm, and the hydroelectric ball valve casting belongs to super-long and thick hydroelectric valve body castings; the shaft is used as a part of the hydroelectric assembly machine set for bearing force, the quality requirement is strict, and casting defects such as shrinkage porosity and cracks of the core are not allowed; according to the section of the casting, a large-size thermal pitch circle is formed at the intersection part of the shaft and the ball valve main body, the thermal pitch circle is the inscribed diameter of the maximum wall thickness thermal pitch of the casting, the diameter of the thermal pitch circle is 1000mm, the intersection thermal pitch of the position is large, and the position is the key for solving the solidification feeding problem in the casting process.
In the prior art, in order to solve the problems, a riser is arranged at the intersection part of a shaft and a ball valve main body so as to realize feeding of the riser to a thermal node circle, the riser is arranged at the upper end part of the ball valve main body, and a partition chiller is arranged between the risers; the casting method has the following defects:
the mode of arranging the riser at the intersection part of the shaft and the ball valve main body increases the hot junction of the intersection part of the shaft and the ball valve main body, the riser cannot feed the central part of a hot junction circle in the solidification process, and the NDT detects that excessive shrinkage porosity exists.
The junction of the shaft and the ball valve body is provided with a riser, the junction of the shaft and the ball valve body belongs to a thick and large structure, a cast solidification structure of the junction is not compact, and cracks are easy to generate under the thermal action processes of riser cutting, gouging and the like.
The intersection part of the shaft and the ball valve main body belongs to a curved surface transition part, a dead head is designed at the part, the coverage area is large, the curved surface shape of a casting cannot be ensured by dead head cutting and gouging grinding, and the production cost waste is caused by the processes of cutting shortage, large quantity and repeated working procedures. And the shaft is an important stressed assembly surface, the structure is thick, and the shrinkage of the core is easy to occur during solidification shrinkage.
Disclosure of Invention
In order to overcome the problems of solidification and shrinkage porosity of a thick shaft, thick cutting and easy cracking of a riser root structure and the need of repairing a riser designed in a curved surface shape for many times caused by the prior art, a casting method of a ball valve body is needed.
A casting method of a ball valve body comprises the following steps:
and a riser neck is arranged at the joint of the hole of the valve body and the shaft of the valve body.
A riser is arranged above the riser neck; the cavity of the riser neck is formed in a molding mode, and the cavity of the casting is communicated with the riser through the riser neck; namely, the casting cavity of the valve body is communicated with the riser through the riser neck during casting. Because the arc surface of the valve body has a special tolerance, if the riser is arranged at the arc surface of the valve body, the riser is difficult to cut, repair such as gouging and grinding, and the like, so that the riser is arranged at the inner side of the valve body.
A chilling device is arranged at the outer circumference of the shaft of the valve body; the shaft diameter of the valve body is large, the riser is used for feeding to the shaft through an L-turn feeding channel, linear shrinkage porosity is easily generated in the shaft center part in the solidification feeding process, the thick and large shaft needs to be subjected to strong chilling, the chilling device is designed at the outer circumference of the shaft, the shaft is rapidly and simultaneously subjected to surface solidification under the chilling of the shaft chilling device, and the modulus of the thick and large shaft is reduced.
In one embodiment, the step of providing a riser in the riser neck above the riser neck, the riser being provided as a stepped riser. The riser is arranged inside the hole of the valve body, so that the diameter of the riser is limited by the diameter of the hole of the valve body, the designed height-diameter ratio of the riser is larger than 1.5, the shrinkage gradient of the riser is poor, secondary shrinkage porosity of the riser is easy to occur, and the riser is arranged as a stepped riser, so that the height of the riser can be reduced, and the designed height-diameter ratio of the riser is reduced.
In one embodiment, the stepped riser comprises a first stepped riser and a second stepped riser, wherein the diameter of the second stepped riser is larger than that of the first stepped riser, preferably, the diameter of the second stepped riser is larger than 20-30% of that of the first stepped riser, so that a feeding channel in the middle of the whole riser is unobstructed, and feeding requirements on a valve body casting are met.
In one embodiment, the first step riser is disposed inside the bore of the valve body and the second step riser is disposed outside the bore of the valve body.
In one embodiment, the clearance between the outer diameter of the first step riser and the bore of the valve body is greater than 300 mm. Therefore, the sand between the first step riser and the valve body can be prevented from being sintered.
In one embodiment, the step of providing a riser neck in a joint of the bore of the valve body and the shaft of the valve body, the riser neck having a circular shape, and an outer diameter identical to a bore diameter of the bore of the valve body.
In one embodiment, a riser neck is arranged at the joint of the hole of the valve body and the shaft of the valve body, the thickness of the riser neck is larger than the diameter of a thermal pitch circle at the intersection of the shaft of the valve body and the main body of the valve body, and the riser neck and the thermal pitch circle can be ensured to be unobstructed in a feeding channel.
In one embodiment, the step of providing a riser neck at the junction of the bore of the valve body and the shaft of the valve body, the thermal pitch circle having a modulus of M1, a diameter of D, and M1 ═ D/2; or looking at the modulus of thermal pitch circle M1 through a MAGMA simulation, wherein the modulus of the thickness of the riser neck M2 is 1.2M1, and the distance from the center of the shaft of the valve body to the upper end surface of the riser neck is more than one half of the diameter of the shaft of the valve body; this ensures that the feeder head feeds the thermal budget to form a gravity feeding effect.
In one embodiment, after a riser is arranged in the hole of the valve body, an insulation board is arranged around the outer diameter of the riser, so that the insulation feeding effect of the riser can be increased.
In one embodiment, the step of providing a quench device in an outer circumferential portion of the shaft of the valve body; the inner contour of the chilling device is matched with the excircle structure of the shaft of the valve body, the wall thickness is 100-150 mm, and the chilling device is divided into two halves so as to be convenient to install and operate; the shaft cooling device is processed at the part contacted with the shaft of the valve body, so that the smooth contact surface can be ensured, and the installation and matching effect is remarkable.
By adopting the casting method provided by the invention, the riser is arranged in the hole of the valve body casting, and the riser neck is over against the hot joint position of the shaft of the valve body, so that the problems of round shrinkage of the hot joint at the intersection of the shaft and the valve body main body, riser cutting and air gouging grinding difficulty are solved, the external structure of the valve body casting does not need cutting and grinding treatment, the operation procedures are reduced, and the production period is shortened; the riser is provided with a step riser, so that the problem of the limited space size and the large riser height-diameter ratio is solved, and the riser feeding gradient and the good channel are ensured; meanwhile, the periphery of the shaft is provided with a chilling device, so that the effects of quickly and simultaneously solidifying the surface of the shaft and quickly reducing the modulus are achieved; the production period can be obviously shortened and the casting quality can be improved by adopting the measures.
Drawings
FIG. 1 is a schematic illustration of a structure of an embodiment cast spool ball valve;
FIG. 2 is a schematic thermal knuckle circle of an embodiment spool ball valve casting;
FIG. 3 is a schematic illustration of riser placement for an embodiment cast spool valve;
FIG. 4 is a schematic illustration of a chiller arrangement for an embodiment cast with a ball valve;
FIG. 5 is a schematic diagram of the configuration of a chiller for an embodiment cast with a ball valve.
10-a ball valve body; 20-axis; 30-thermal pitch circle; 40-riser neck; 50-riser; 60-chilling equipment; 70-heat insulation board; 501-first step riser; 502-second step riser.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The embodiment provides a casting method of a hydroelectric ball valve body with a shaft, the valve body of the ball valve with the shaft mainly comprises a ball valve body 10 and a shaft 20, please refer to fig. 1, and the casting method comprises the following steps:
s01, arranging a riser neck 40 at the joint of the valve body hole and the valve body shaft 20, forming a cavity of the riser neck 40 in a molding mode, and communicating the cavity of the casting with a riser through the riser neck; namely, the casting cavity of the valve body is communicated with the riser through the riser neck during casting. The riser neck 40 is round, and the outer diameter of the riser neck 40 is the same as the aperture of the hole of the valve body; the thickness of the riser neck 40 is greater than the diameter of the thermal knuckle circle 30 at the intersection of the shaft 20 of the valve body and the main body of the valve body, so that the arrangement can ensure that the feeding channel between the riser neck 40 and the thermal knuckle circle 30 is smooth. See fig. 2 and 3 for an illustration.
Specifically, the modulus of the thermal pitch circle 30 is M1, the diameter of the thermal pitch circle 30 is D, and M1 is D/2; or looking at the modulus M1 of the thermal pitch circle 30 by MAGMA simulation, the modulus M2 of the thickness of the riser neck 40 is 1.2M1, and the distance of the center of the shaft 20 from the upper end face of the riser neck 40 is greater than one-half of the diameter of the shaft 20; this ensures that the feeding of the risers 50 to the thermal burl 30 is a gravity feeding effect.
S02, a dead head 50 is arranged above the dead head neck 40; i.e. the casting cavity of the valve body is in communication with the riser 50 through the riser neck 40 during casting.
Specifically, the riser 50 is set as a stepped riser, the stepped riser comprises a first stepped riser 501 and a second stepped riser 502, and the diameter of the second stepped riser 502 is 20% -30% larger than that of the first stepped riser 501, so that a feeding channel in the middle of the whole riser 50 is smooth, and the feeding requirement on a valve body casting is met. The first stepped riser 501 is arranged inside a hole of the valve body, the second stepped riser 502 is arranged outside the hole of the valve body, and in the installation process of the first stepped riser 501, the clearance between the outer diameter of the first stepped riser 501 and the hole of the valve body is larger than 300mm, so that the sintering phenomenon of sand between the first stepped riser 501 and the valve body can be avoided; and the heat insulation plates 70 are arranged around the outer diameters of the first stepped riser 501 and the second stepped riser 502, so that the heat insulation and feeding effects of the first stepped riser 501 and the second stepped riser 502 can be increased.
Since the arc surface of the valve body has a special tolerance, if the riser 50 is provided on the arc surface of the valve body, the riser 50 is difficult to cut and repair such as gouging is difficult, and therefore the riser 50 is provided inside the valve body. Because the riser 50 is arranged in the hole of the valve body, the diameter of the riser 50 is limited by the hole diameter of the valve body, so that the designed height-diameter ratio of the riser 50 is larger than 1.5, the shrinkage gradient of the riser 50 is poor, and the riser 50 is easy to shrink secondarily, therefore, the riser 50 is arranged as a stepped riser, so that the height of the riser 50 can be reduced, and the designed height-diameter ratio of the riser 50 is reduced.
S03, arranging a chilling device 60 at the outer circumference part of the shaft 20 of the valve body; see fig. 4 and 5 for an illustration. As the diameter of the shaft 20 of the valve body is large, the feeding of the riser 50 to the shaft 20 is an L-shaped turning feeding channel, the problem of linear shrinkage porosity is easily generated in the center of the shaft 20 in the solidification feeding process, the thick shaft 20 needs to be chilled strongly, and the chilling device 60 is designed at the outer circumference of the shaft 20, so that the surface layer of the shaft 20 is solidified quickly and simultaneously under the chilling of the chilling device 60, and the modulus of the thick shaft 20 is reduced.
Specifically, the inner contour of the chilling device 60 is matched with the outer circle structure of the shaft 20 of the valve body, the wall thickness is 100-150 mm, and the chilling device is divided into two halves so as to be convenient to install and operate; the contact part of the shaft 20 cooling device and the shaft 20 is processed, so that the smooth contact surface can be ensured, and the mounting and matching effect is remarkable.
It should be noted that, because the shaft diameter of the shaft 20 of the ball valve body is large, the casting shrinkage is easy to cause the problems of large crystal grains and shrinkage porosity of the core, the modulus of the shaft 20 needs to be reduced on the whole by fast chilling the surface, and the chilling device 60 is designed to be used as the form-following chilling block outside the shaft 20 and simultaneously chill the surface of the shaft 20.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A casting method of a ball valve body is characterized by comprising the following steps,
a riser neck is arranged at the joint of the hole of the valve body and the shaft of the valve body;
a riser is arranged above the riser neck;
and a chilling device is arranged at the outer circumference part of the shaft of the valve body.
2. A method of casting a ball valve body as defined in claim 1, wherein the cavity of the riser neck is formed by molding, and the cavity of the casting and the riser communicate through the riser neck.
3. A method of casting a ball valve body as claimed in claim 1, wherein the riser is provided as a stepped riser.
4. The method of casting a ball valve body of claim 3, wherein the stepped riser comprises a first stepped riser, a second stepped riser having a diameter greater than a diameter of the first stepped riser.
5. A method of casting a ball valve body as claimed in claim 1, wherein the first stepped riser is disposed inside the bore of the valve body and the second stepped riser is disposed outside the bore of the valve body.
6. A method of casting a ball valve body as claimed in claim 1, wherein the clearance between the outer diameter of the first stepped riser and the bore of the valve body is greater than 300 mm.
7. A casting method of a ball valve body according to claim 1, characterized by the step of providing a riser neck in a joint portion of the bore of the valve body and the shaft of the valve body, the riser neck having an outer diameter identical to a bore diameter of the bore of the valve body.
8. A method of casting a ball valve body as defined in claim 1, wherein the step of providing a riser neck in a junction of the bore of the valve body and the shaft of the valve body, the riser neck having a thickness greater than a diameter of a thermal pitch circle at an intersection of the shaft of the valve body and the body of the valve body.
9. A casting method of a ball valve body according to claim 6, wherein the step of providing a riser neck in a joint of a hole of the valve body and a shaft of the valve body, the thermal pitch circle having a module of M1, a diameter of D, M1-D/2, and a thickness of M2-1.2M 1.
10. A method of casting a ball valve body according to claim 1, wherein the center of the shaft of the valve body is located at a distance greater than one-half the diameter of the shaft of the valve body from the upper end surface of the riser neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110692457.3A CN113523192A (en) | 2021-06-23 | 2021-06-23 | Casting method of ball valve body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110692457.3A CN113523192A (en) | 2021-06-23 | 2021-06-23 | Casting method of ball valve body |
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| Publication Number | Publication Date |
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| CN113523192A true CN113523192A (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110692457.3A Pending CN113523192A (en) | 2021-06-23 | 2021-06-23 | Casting method of ball valve body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010077484A (en) * | 2000-02-02 | 2001-08-20 | 주학지 | axle housing casting method |
| CN103418750A (en) * | 2013-07-22 | 2013-12-04 | 洛阳市兴荣工业有限公司 | Spherical valve main body casting technology |
| CN203887161U (en) * | 2014-06-03 | 2014-10-22 | 芜湖永达科技有限公司 | Nodular iron shell feeding mold |
| CN106984775A (en) * | 2017-04-01 | 2017-07-28 | 共享铸钢有限公司 | A kind of casting method of heavy wall gas-turbine hp outer cylinder inlet end casting |
| CN109465397A (en) * | 2018-12-29 | 2019-03-15 | 湖州中联机械制造有限公司 | A kind of casting technique of lower bearing bracket |
| CN111515341A (en) * | 2020-02-21 | 2020-08-11 | 中铁物总技术有限公司 | Method for improving internal quality of high manganese steel frog and reducing production cost |
| CN111940682A (en) * | 2020-09-16 | 2020-11-17 | 上海圣德曼铸造海安有限公司 | Hot riser of automobile differential casing pin hole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure |
| CN112371919A (en) * | 2020-11-23 | 2021-02-19 | 勤威(天津)工业有限公司 | Casting model structure for large-sized differential housing with thick flange plate surface |
| CN213104359U (en) * | 2020-08-03 | 2021-05-04 | 重庆玛斯特机械制造股份有限公司 | Camshaft casting model |
-
2021
- 2021-06-23 CN CN202110692457.3A patent/CN113523192A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010077484A (en) * | 2000-02-02 | 2001-08-20 | 주학지 | axle housing casting method |
| CN103418750A (en) * | 2013-07-22 | 2013-12-04 | 洛阳市兴荣工业有限公司 | Spherical valve main body casting technology |
| CN203887161U (en) * | 2014-06-03 | 2014-10-22 | 芜湖永达科技有限公司 | Nodular iron shell feeding mold |
| CN106984775A (en) * | 2017-04-01 | 2017-07-28 | 共享铸钢有限公司 | A kind of casting method of heavy wall gas-turbine hp outer cylinder inlet end casting |
| CN109465397A (en) * | 2018-12-29 | 2019-03-15 | 湖州中联机械制造有限公司 | A kind of casting technique of lower bearing bracket |
| CN111515341A (en) * | 2020-02-21 | 2020-08-11 | 中铁物总技术有限公司 | Method for improving internal quality of high manganese steel frog and reducing production cost |
| CN213104359U (en) * | 2020-08-03 | 2021-05-04 | 重庆玛斯特机械制造股份有限公司 | Camshaft casting model |
| CN111940682A (en) * | 2020-09-16 | 2020-11-17 | 上海圣德曼铸造海安有限公司 | Hot riser of automobile differential casing pin hole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure |
| CN112371919A (en) * | 2020-11-23 | 2021-02-19 | 勤威(天津)工业有限公司 | Casting model structure for large-sized differential housing with thick flange plate surface |
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Application publication date: 20211022 |
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