CN118558973B - Centrifugal casting die and process for lining core sphere for ball valve - Google Patents
Centrifugal casting die and process for lining core sphere for ball valve Download PDFInfo
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- CN118558973B CN118558973B CN202411041647.9A CN202411041647A CN118558973B CN 118558973 B CN118558973 B CN 118558973B CN 202411041647 A CN202411041647 A CN 202411041647A CN 118558973 B CN118558973 B CN 118558973B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000009750 centrifugal casting Methods 0.000 title claims abstract description 37
- 238000005266 casting Methods 0.000 claims abstract description 77
- 239000000463 material Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000007769 metal material Substances 0.000 abstract description 7
- 229910000510 noble metal Inorganic materials 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000009991 scouring Methods 0.000 abstract description 4
- 239000000919 ceramic Substances 0.000 abstract description 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000005242 forging Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a centrifugal casting mould and a centrifugal casting process of a lining core sphere for a ball valve, which belong to the technical field of centrifugal casting and comprise an outer mould and an inner mould, wherein one end of the outer mould is provided with a connecting device fixedly connected with a rotating shaft of a horizontal centrifugal machine, the other end of the outer mould is provided with an inner mould mounting cavity, the inner mould consists of a left half mould, a right half mould and a shaft hole casting rod, and the inner mould is integrally mounted in the inner mould mounting cavity; the center of the right half mould is provided with a casting hole communicated with the spherical inner cavity, and a locking device is arranged between the outer mould and the inner mould; the method is characterized in that: the spherical inner core is arranged in the spherical inner cavity of the inner mold, and the spherical inner core is made of low-cost materials such as ceramics, cast iron and the like, so that the spherical body has the advantages of high pressure resistance, scouring resistance, wear resistance and corrosion resistance, can greatly save noble metal materials, reduces the product cost, and has high performance and low cost. The ball valve is particularly suitable for manufacturing high-temperature-resistant, high-pressure-resistant, wear-resistant, corrosion-resistant and anti-scouring large-caliber ball valve balls.
Description
Technical Field
The invention relates to a centrifugal casting die and a centrifugal casting process for a ball body of a ball valve, in particular to a centrifugal casting die and a centrifugal casting process for a ball body of a lining core. The invention is suitable for manufacturing the ball body of the high-temperature-resistant, high-pressure-resistant, wear-resistant, corrosion-resistant and anti-scouring large-caliber ball valve.
Background
Currently, the ball of ball valves is generally manufactured by a casting or forging process. The casting process is common in sand mould casting process and lost wax casting process, and the manufactured spheres have the defects of sand holes, air holes and the like, have low density and low pressure resistance, so that the casting process is only suitable for common working conditions, and has the advantages of high sand and wax material consumption, 35-40% of molten iron loss, high material consumption and great pollution to the environment in the production process; the forging process is to form a solid sphere blank by using the section steel through multiple forging and pressing, and then to machine and grind the solid sphere blank into a shape, so that the sphere has high density and good pressure resistance, and is suitable for high-pressure valve products, but the manufacturing process is complex, the production efficiency is low, the material waste is large, and the manufacturing cost is high. In order to solve the problems of the ball casting and forging process, the company develops a centrifugal casting die and a casting process of the ball valve, and the ball is cast by adopting the centrifugal process, so that the environment-friendly problem of the production process is solved, the density of the ball is improved, and the material loss in the production process is reduced. However, the centrifugal casting process has the advantages that the whole sphere is formed by casting molten steel, the material consumption is large, the product cost is high, and the centrifugal casting process is particularly suitable for large-caliber spheres used in special working conditions such as high temperature, high scouring, high abrasion, strong corrosion and the like, and has the advantages of large material consumption, high price and high product cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a centrifugal casting die and a centrifugal casting process for the lining core sphere for the ball valve, wherein the lining core sphere can be formed by adopting the centrifugal casting of the lining core of a low-price material, and the centrifugal casting die and the centrifugal casting process not only have the high performance requirement of special working conditions, but also can realize the saving of noble metal materials and greatly reduce the product cost.
The centrifugal casting die for achieving the purpose of the invention comprises:
The centrifugal casting mold for lining core ball body of ball valve includes outer mold and inner mold, the outer mold is made of common steel material, the inner mold is made of high temperature resistant steel material, one end of the outer mold has connecting device connected to the rotation shaft of horizontal centrifugal machine, and the other end has inner mold installing cavity, and the inner mold consists of left half mold, right half mold and shaft hole casting rod and is installed inside the inner mold installing cavity; a hemispherical cavity is symmetrically arranged on one side of the contact surface of the left half die and the right half die, the left half die and the right half die form a spherical cavity, a casting hole communicated with the spherical cavity is arranged in the center of the right half die, and a locking device is arranged between the outer die and the inner die; the shaft hole casting rod is arranged on the inner wall of the spherical inner cavity in the diameter direction perpendicular to the center line of the casting hole, and the diameter of the spherical inner cavity is designed according to the diameter of the cast spherical blank; the method is characterized in that: a spherical inner core is arranged in the spherical inner cavity, the spherical inner core is provided with a central through hole, the diameter of the central through hole is larger than the diameter of a channel hole of a spherical blank, an annular cavity is formed between the spherical inner core outer spherical surface and the spherical inner cavity, and the annular cavity is communicated with a casting hole; the outer spherical surface of the spherical inner core is provided with a shaft hole casting cavity, the lower end of the shaft hole casting rod is sleeved on the inner side of the shaft hole casting cavity, and a gap is formed between the surface of the shaft hole casting rod and the shaft hole casting cavity; the spherical inner core is fixedly arranged in a positioning hole on the inner wall of the spherical inner cavity of the movable die through at least two radial positioning rods on the outer spherical surface of the spherical inner core.
Preferably, the number of the radial positioning rods is three, the radial positioning rods are uniformly distributed on a plane passing through the sphere center of the spherical inner core and perpendicular to the center line of the central through hole, and positioning holes are formed in the inner wall of the spherical inner cavity of the movable die and correspond to the radial positioning rods.
Preferably, a radial through hole is provided between the central through hole of the spherical inner core and the outer spherical surface.
Preferably, the radial through holes are distributed uniformly on a plane passing through the sphere center of the spherical inner core and perpendicular to the center line of the central through hole.
Preferably, at least one of the radial through holes is in communication with the axial bore casting cavity.
The centrifugal casting process for realizing the purpose of the invention comprises the following steps:
the centrifugal casting process of the lining core sphere for the ball valve comprises a die mounting process, a centrifugal casting process and a demolding process, and is characterized in that:
the die mounting process comprises the following steps:
S1, fixedly connecting and installing a connecting device of an outer die and a rotating shaft of a centrifugal machine;
s2, carrying out flaming heating on hemispherical inner cavities of the left half die and the right half die and the shaft hole casting rod;
S3, spraying high-temperature resistant paint on the surfaces of the heated left half mold and right half mold hemispherical inner cavities and the shaft hole casting rod;
s4, mounting a shaft hole casting rod and a spherical inner core between a left half die and a right half die, integrally mounting the shaft hole casting rod and the spherical inner core into an inner die mounting cavity of an outer die, and locking and mounting the inner die in the outer die by a locking device;
The centrifugal casting process comprises the following steps:
S1, after the die and the centrifugal machine are installed, starting the centrifugal machine;
s2, pouring molten iron into the spherical inner cavity of the inner mold through the casting hole, wherein the pouring molten iron amount is calculated and determined according to the weight of the spheres with different sizes and the machining allowance of the inner hole;
S3, after pouring molten iron is completed, closing the centrifugal machine after the set high-speed centrifugal rotation time; the centrifugal rotation time is set according to the time required by the solidification molding of the sphere;
The demolding process comprises the following steps:
S1, unlocking process: after the centrifugal machine stops rotating, the locking device is opened;
s2, pushing a mold: pushing out the right half die to the outer side of the inner die mounting cavity of the outer die, and automatically demolding and rolling the spherical blank onto a collecting platform;
s3, blank processing technology: pressing a radial positioning rod protruding out of the outer sphere of the sphere blank into a radial hole of the spherical inner core, and performing surfacing and grinding on a pressing hole on the radial outer side of the radial positioning rod;
s4, cleaning: after the sphere blank is demolded, residues on the surfaces of the hemispherical inner cavities of the left half die and the right half die and the shaft hole casting rod are cleaned.
Compared with the prior art, the invention has the beneficial effects that: the spherical inner core is arranged in the spherical inner cavity of the inner mold, molten steel is centrifugally cast on the surface of the spherical inner core to form a spherical blank, and the spherical inner core is made of low-cost materials such as ceramic, cast iron and the like, so that the spherical body has high performance requirements for special working conditions, noble metal materials can be greatly reduced, the product cost is reduced, and particularly for large-caliber spherical bodies with the runner diameter of more than 100mm, molten steel materials can be saved by more than 30%, and the cost saving effect is very remarkable.
Drawings
Fig. 1 is a cross-sectional view of a mold structure of the present invention.
Fig. 2 is a right side view of the left mold half of fig. 1 according to the present invention.
Fig. 3 is a left side view of the right mold half of fig. 1 according to the present invention.
In the figure: the casting mold comprises a first outer mold, a second left mold half, a third right mold half, a casting rod with a shaft hole 4, a spherical inner core 5, a casting hole 6, an annular cavity 7, a radial positioning rod 8, a demolding hole 9, a central through hole 10, a left half hole 11, a right half hole 12 and a casting cavity with a shaft hole 13.
Detailed Description
The centrifugal casting die for the lining core sphere for the ball valve shown in fig. 1 comprises an outer die 1 and an inner die, wherein the outer die 1 is made of common steel materials, the manufacturing cost of a grinding tool is reduced, the inner die is made of high-temperature resistant steel materials, one end of the outer die 1 is provided with a connecting device fixedly connected with a rotating shaft of a horizontal centrifugal machine, the connecting device can be clamped and connected by a flange connecting device or a clamping head or fixedly connected by bolts, the other end of the outer die 1 is provided with an inner die mounting cavity, the inner die consists of a left half die 2, a right half die 3 and a shaft hole casting rod 4, and the inner die is integrally mounted in the inner die mounting cavity; the contact surface side of the left half die 2 and the right half die 3 is provided with symmetrical hemispherical inner cavities, and the two inner cavities form a spherical inner cavity; the center of the right plane of the right half mold 3 is provided with a casting hole 6 communicated with a spherical inner cavity, a locking device is arranged between the outer mold 1 and the inner mold, and the inner mold is pressed into an inner mold mounting cavity of the outer mold 1; the axle hole casting rod 4 is fixedly arranged on the inner wall of the spherical cavity perpendicular to the central line of the casting hole 6 in the diameter direction, namely, the installation position of the axle hole casting rod 4 on the spherical cavity is the diameter direction perpendicular to the central line of the casting hole 6 through the spherical center of the spherical cavity, in the invention, the axle hole casting rod 4 is fixedly arranged between the contact surfaces of the left half die 2 and the right half die 3, and the diameter of the spherical cavity is designed according to the diameter of a cast spherical blank, namely, the diameter of the spherical cavity is equal to the diameter of the spherical blank; the method is characterized in that: the spherical inner cavity is internally provided with a spherical inner core 5, the spherical inner core 5 is provided with a central through hole 10, the diameter of the central through hole 10 is larger than the diameter of a passage hole of a spherical blank, an annular cavity 7 is formed between the outer spherical surface of the spherical inner core 5 and the spherical inner cavity, the annular cavity 7 is communicated with a casting hole 6, molten steel is injected into the spherical inner cavity through the casting hole 6, the molten steel is wrapped on the surface of the spherical inner core 5 under the action of centrifugal force to form the spherical blank, the spherical inner core 5 is made of ceramic or low-value metal materials, the using amount of the molten steel of a noble metal material is reduced, the manufacturing cost of the spherical body is reduced, the radial thickness of the annular cavity 7 is designed according to the using working condition pressure of the spherical body, the smaller the radial thickness of the annular cavity 7 is, the cost reduction effect is larger, and the lower limit of the radial thickness of the annular cavity 7 is not required to be smaller than the wall thickness of a valve body under the condition of reliably bearing working condition pressure; the outer spherical surface of the spherical inner core 5 is provided with a shaft hole casting cavity 13, the lower end of the shaft hole casting rod 4 is sleeved on the inner side of the shaft hole casting cavity 13, a gap is formed between the surface of the shaft hole casting rod 4 and the shaft hole casting cavity 13, molten steel enters the gap under the action of centrifugal force, and a valve rod mounting hole is formed by casting; the spherical inner core 5 is fixedly arranged in the positioning holes of the spherical inner cavity of the movable die through radial positioning rods 8 on the outer spherical surface of the spherical inner core 5, at least two radial positioning rods 8 are used for fixedly arranging the spherical inner core 5 on the inner wall of the spherical inner cavity to prevent the spherical inner core 5 from swinging under the action of centrifugal force in the casting process, and the positioning holes are formed by mutually splicing a left half hole 11 on one side of the hemispherical inner cavity of the left half die 2 and a right half hole 12 on one side of the hemispherical inner cavity of the right half die 3, as shown in figures 2 and 3.
The number of the radial positioning rods 8 is three, the radial positioning rods are uniformly distributed on a plane passing through the sphere center of the spherical inner core 5 and perpendicular to the center line of the central through hole 10, the positioning holes are formed in the corresponding positions of the inner wall of the spherical inner cavity of the inner mold and the radial positioning rods 8, three-point positioning is formed on the spherical inner core 5, and the fixing stability of the spherical inner core 5 is improved.
The inner mold can also be composed of an upper half mold and a lower half mold or a front half mold and a back half mold which are provided with symmetrical hemispherical cavities, the shaft hole casting rod 4 can be integrally arranged at the top of one hemispherical cavity, more than three radial positioning rods 8 are uniformly arranged on the radial outer spherical surface perpendicular to the center line of the spherical inner core 5, at least two radial positioning rods 8 are inserted into positioning holes between the contact surfaces of the upper half mold and the lower half mold or between the front half mold and the back half mold, and other radial positioning rods 8 can be propped against the inner wall of the spherical cavity of the inner mold, so that the spherical inner core 5 can be reliably fixed, and the inner mold and a spherical blank can be reliably demoulded. The two half molds form the inner mold through different splicing modes, and the inner mold belongs to the protection scope of the invention. After the sphere blank is demolded, the radial positioning rods 8 protruding out of the outer sphere of the sphere blank are required to be processed and then pressed into the sphere of the sphere blank, and then the overlaying welding treatment is carried out on the pressed holes, so that the fewer the number of the radial positioning rods 8, the better the condition that the reliable fixing of the spherical inner core 5 is ensured. For the spherical inner core 5 made of ceramic materials, the radial positioning rod 8 and the spherical inner core 5 adopt an integrated structure, after a spherical blank is demolded, the radial positioning rod 8 is completely removed, the radial positioning rod 8 is integrally pressed into the spherical inner core 5, and a metal material with the same performance as molten steel is deposited in a pressing hole.
Radial through holes are arranged between the central through holes 10 of the spherical inner cores 5 and the outer spherical surface, molten steel can flow into the annular cavity 7 through the radial through holes under the action of centrifugal force in the casting process, so that the molten steel circulation performance is improved, and meanwhile, the spherical inner cores 5 are fixedly cast in the spherical body, so that the spherical inner cores 5 are prevented from moving in gaps generated between the spherical inner cores 5 due to different expansion coefficients in the spherical body.
The radial through holes are uniformly distributed on a plane passing through the sphere center of the spherical inner core 5 and perpendicular to the center line of the central through hole 10.
At least one radial through hole is communicated with the shaft hole casting cavity 13, so that molten steel can reliably flow into the shaft hole casting cavity 13, and the casting reliability of the valve rod mounting hole is improved.
The center of the left end face of the outer die 1 is provided with a demoulding hole 9, a push rod is arranged in the demoulding hole 9, and the push rod is an air pressure ejector rod in a central hole of a rotating shaft of the centrifugal machine. After casting is finished, the centrifugal machine pneumatic system starts the pneumatic ejector rod to eject the right half die 3 out of the inner die mounting cavity of the outer die 1, and the spherical blank automatically rolls out of the inner cavity of the left half die 2, so that the automatic pneumatic demoulding of the centrifugal machine is realized, the problems of high labor intensity and troublesome operation of the manual demoulding operation process in the prior art are solved, and the production efficiency is improved.
The outer circular surface of the right half die 3 is matched with the inner die mounting cavity of the outer die 1 by adopting conical surfaces which gradually expand from left to right, so that the friction force between the inner die and the outer die is reduced during demolding, the demolding thrust or pulling force is reduced, and the demolding is easy and easy.
An anti-rotation positioning device is arranged between the outer circular surfaces of the left half die 2 and the right half die 3 and the inner die mounting hole of the outer die 1, and the anti-rotation positioning device is formed by mutually matching axial positioning ribs on the inner hole wall of the outer die 1 with axial positioning grooves on the outer circular surfaces of the left half die 2 and the right half die 3. When the centrifugal machine rotates at a high speed, the axial positioning ribs and the axial positioning grooves are mutually matched, so that the left half die 2, the right half die 3 and the outer die 1 are prevented from rotating relatively, and the compression mounting reliability of the inner die is improved.
The locking device is formed by arranging locking pins between the right end face of the right half die 3 and radial pin holes of the outer die 1, wherein at least two locking pins are uniformly distributed in the circumferential direction. The locking pin adopts a wedge-shaped pin to be inserted from the radial pin hole, and under the action of centrifugal force, the locking pin is in wedge-fit with the radial pin hole, so that the inner die is tightly pressed and installed in the inner die installation cavity of the outer die 1.
The centrifugal casting process for realizing the purpose of the invention comprises the following steps:
the centrifugal casting process of the lining core sphere for the ball valve comprises a die mounting process, a centrifugal casting process and a demolding process, and is characterized in that:
the die mounting process comprises the following steps:
s1, fixedly connecting and installing a connecting device of an outer die 1 with a rotating shaft of a centrifugal machine; the outer die 1 and the rotating shaft of the centrifugal machine can be installed in a flange type or connected in a chuck clamping type;
S2, carrying out flaming heating on hemispherical inner cavities of the left half die 2 and the right half die 3 and the shaft hole casting rod 4; the surfaces of hemispherical inner cavities of the left half die 2 and the right half die 3 and the shaft hole casting rod 4 can be quickly combined with the paint;
S3, spraying high-temperature resistant paint on the surfaces of the hemispherical inner cavities of the heated left half die 2 and right half die 3 and the shaft hole casting rod 4; the high-temperature resistant coating is special for casting, prevents molten iron from adhering to the die, and protects the durability of the die;
S4, mounting a shaft hole casting rod 4 and a spherical inner core 5 between a left half die 2 and a right half die 3, integrally mounting the whole casting rod and the spherical inner core into an inner die mounting cavity of an outer die 1, and locking and mounting the inner die in the outer die 1 by a locking device;
The centrifugal casting process comprises the following steps:
S1, after the die and the centrifugal machine are installed, starting the centrifugal machine;
s2, pouring molten steel into the spherical inner cavity of the inner mold through a casting hole 6, and determining the pouring molten steel amount by calculating according to the volume of spherical blanks with different sizes minus the volume of the spherical inner core 5 plus the machining allowance of the inner hole;
S3, after the molten steel is poured, closing the centrifugal machine after the preset high-speed centrifugal rotation time; the centrifugal rotation time is set according to the time required by the solidification molding of the sphere;
The demolding process comprises the following steps:
S1, unlocking process: after the centrifugal machine stops rotating, the locking device is opened;
S2, pushing a mold: pushing out the right half mould 3 to the outer side of the inner mould mounting cavity of the outer mould 1, and automatically demoulding and rolling the spherical blank onto a collecting platform;
S3, blank processing technology: pressing a radial positioning rod 8 protruding out of the outer sphere of the sphere blank into the spherical inner core 5, and performing build-up welding and leveling on a pressing hole at the radial outer side of the radial positioning rod 8;
S4, cleaning: after the sphere blank is demolded, residues on the surfaces of hemispherical inner cavities of the left half die 2 and the right half die 3 and the shaft hole casting rod 4 are cleaned.
The centrifugal machine can also adopt a vertical centrifugal machine, and when the vertical centrifugal machine is adopted, the right half mould 3 and the sphere blank in the demoulding process are pushed out from the inner upper part of the inner mould mounting cavity of the outer mould 1 by adopting external force.
In the invention, molten steel is melted by noble metal materials such as cast steel, stainless steel, nickel alloy, austenitic alloy and the like.
The directional words such as "left", "right", "upper", "lower", "front", "rear" and the like in the present invention are merely for the directions in the drawings, and should not be construed as limiting the technical scheme of the present invention.
Claims (6)
1. The centrifugal casting die for the lining core ball body for the ball valve comprises an outer die (1) and an inner die, wherein the inner die is made of a high-temperature-resistant steel material, one end of the outer die (1) is provided with a connecting device fixedly connected with a rotating shaft of a horizontal centrifugal machine, the other end of the outer die is provided with an inner die mounting cavity, and the inner die consists of a left half die (2), a right half die (3) and a shaft hole casting rod (4) and is mounted in the inner die mounting cavity; a hemispherical cavity is symmetrically arranged on one side of the contact surface of the left half die (2) and the right half die (3), the two form a spherical cavity, a casting hole (6) communicated with the spherical cavity is arranged in the center of the right half die (3), and a locking device is arranged between the outer die (1) and the inner die; the shaft hole casting rod (4) is fixedly arranged on the inner wall of the spherical inner cavity in the diameter direction perpendicular to the center line of the casting hole (6), and the diameter of the spherical inner cavity is designed according to the diameter of the cast spherical blank; the method is characterized in that: a spherical inner core (5) is arranged in the spherical inner cavity, the spherical inner core (5) is provided with a central through hole (10), the diameter of the central through hole (10) is larger than the diameter of a passage hole of a spherical blank, an annular cavity (7) is formed between the outer spherical surface of the spherical inner core (5) and the spherical inner cavity, and the annular cavity (7) is communicated with a casting hole (6); the outer spherical surface of the spherical inner core (5) is provided with a shaft hole casting cavity (13), the lower end of the shaft hole casting rod (4) is sleeved in the shaft hole casting cavity (13), and a gap is formed between the surface of the shaft hole casting rod (4) and the inner wall of the shaft hole casting cavity (13); the spherical inner core (5) is fixedly arranged in the positioning holes of the spherical inner cavity of the movable die through radial positioning rods (8) on the outer spherical surface of the spherical inner core, and at least two radial positioning rods (8) are arranged.
2. The centrifugal casting die for a ball valve lining core sphere according to claim 1, wherein: the number of the radial positioning rods (8) is three, the radial positioning rods are uniformly distributed on a plane passing through the spherical center of the spherical inner core (5) and perpendicular to the central line of the central through hole (10), and the positioning holes are formed in the corresponding positions of the inner wall of the spherical inner cavity of the inner mold and the radial positioning rods (8).
3. A centrifugal casting die for a lining core sphere for a ball valve according to claim 1 or 2, characterized in that: radial through holes are arranged between the central through hole (10) of the spherical inner core (5) and the outer spherical surface.
4. A centrifugal casting die for a ball valve lining core sphere according to claim 3, characterized in that: the radial through holes are uniformly distributed on a plane passing through the sphere center of the spherical inner core (5) and perpendicular to the center line of the central through hole (10).
5. The centrifugal casting die for a ball valve lining core sphere according to claim 4, wherein: at least one of the radial through holes is communicated with the shaft hole casting cavity (13).
6. A centrifugal casting process of a lining core sphere for a ball valve, which uses the centrifugal casting mold of the lining core sphere for the ball valve according to claim 1, comprising a mold mounting process, a centrifugal casting process and a demolding process, and is characterized in that:
the die mounting process comprises the following steps:
s1, fixedly connecting and installing a connecting device of an outer die (1) with a rotating shaft of a centrifugal machine;
S2, performing flaming heating on hemispherical inner cavities of the left half die (2) and the right half die (3) and a shaft hole casting rod (4);
S3, spraying high-temperature resistant paint on the surfaces of the heated left half mold (2) and right half mold (3) hemispherical inner cavities and the shaft hole casting rod (4);
S4, mounting a shaft hole casting rod (4) and a spherical inner core (5) between a left half die (2) and a right half die (3), integrally mounting the shaft hole casting rod and the spherical inner core into an inner die mounting cavity of an outer die (1), and locking and mounting the inner die in the outer die (1) by a locking device;
The centrifugal casting process comprises the following steps:
S1, after the die and the centrifugal machine are installed, starting the centrifugal machine;
S2, pouring molten steel into the spherical inner cavity of the inner mold through a casting hole (6), and determining the pouring molten steel amount by calculating according to the volume of spherical blanks of different sizes minus the volume of the spherical inner core (5) plus the machining allowance of the inner hole;
s3, after the molten steel is poured, closing the centrifugal machine after the preset high-speed centrifugal rotation time; the centrifugal rotation time is set according to the time required by the solidification molding of the sphere blank;
The demolding process comprises the following steps:
S1, unlocking process: after the centrifugal machine stops rotating, the locking device is opened;
S2, pushing a mold: pushing out the right half mould (3) to the outer side of the inner mould mounting cavity of the outer mould (1), and automatically demoulding and rolling the spherical blank onto a collecting platform;
s3, blank processing technology: pressing a radial positioning rod (8) protruding out of the outer sphere of the sphere blank into the spherical inner core (5), and performing surfacing and grinding on a pressing hole at the outer side of the radial positioning rod (8);
S4, cleaning: after the sphere blank is demolded, residues on the surfaces of the hemispherical inner cavities of the left half die (2) and the right half die (3) and the shaft hole casting rod (4) are cleaned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411041647.9A CN118558973B (en) | 2024-07-31 | 2024-07-31 | Centrifugal casting die and process for lining core sphere for ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411041647.9A CN118558973B (en) | 2024-07-31 | 2024-07-31 | Centrifugal casting die and process for lining core sphere for ball valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118558973A CN118558973A (en) | 2024-08-30 |
| CN118558973B true CN118558973B (en) | 2024-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202411041647.9A Active CN118558973B (en) | 2024-07-31 | 2024-07-31 | Centrifugal casting die and process for lining core sphere for ball valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR900004438A (en) * | 1988-09-23 | 1990-04-12 | 정희택 | Method and apparatus for manufacturing ball valve |
| CN113000806A (en) * | 2021-02-26 | 2021-06-22 | 山西汤荣机械制造股份有限公司 | Centrifugal casting hub blank process |
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| CN1218730A (en) * | 1997-11-28 | 1999-06-09 | 蒋传礼 | Centrifugal casting method for metal valve ball and relative device |
| CN1227080C (en) * | 2001-06-22 | 2005-11-16 | 沈海星 | Technology for manufacturing blank of valve ball |
| JP2004058094A (en) * | 2002-07-29 | 2004-02-26 | Jfe Steel Kk | Manufacturing method of centrifugal cast tube |
| CN1301814C (en) * | 2003-08-14 | 2007-02-28 | 律泉精密股份有限公司 | Hollow ball plug and manufacturing method thereof |
| CN116571708A (en) * | 2023-04-07 | 2023-08-11 | 国铭铸管股份有限公司 | Method for reducing inclusions at socket of nodular cast iron pipe |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR900004438A (en) * | 1988-09-23 | 1990-04-12 | 정희택 | Method and apparatus for manufacturing ball valve |
| CN113000806A (en) * | 2021-02-26 | 2021-06-22 | 山西汤荣机械制造股份有限公司 | Centrifugal casting hub blank process |
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