CN111940691A - Manufacturing process of double-bellmouth nodular cast iron pipe - Google Patents
Manufacturing process of double-bellmouth nodular cast iron pipe Download PDFInfo
- Publication number
- CN111940691A CN111940691A CN202010789250.3A CN202010789250A CN111940691A CN 111940691 A CN111940691 A CN 111940691A CN 202010789250 A CN202010789250 A CN 202010789250A CN 111940691 A CN111940691 A CN 111940691A
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- bellmouth
- socket
- ring
- double
- core
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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
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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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
Abstract
The invention discloses a manufacturing process of a double-bellmouth nodular cast iron pipe, which comprises the following steps: 1) filling the dotted casting mould into a centrifugal pipe casting machine, and introducing cooling water into the outer wall of the casting mould for cooling; mounting the manufactured sand mold core on a cast steel core frame, and mounting the cast steel core frame to a female end of a pouring mold; 2) pouring molten iron into a fan-shaped bag of a centrifugal tube casting machine for pouring after spheroidization and slagging-off treatment; 3) starting a tube drawing system of the centrifugal tube casting machine, pouring molten iron into the inner wall of a casting mold, and starting tube drawing; 4) drawing out the double-bellmouth nodular cast iron pipe after drawing and forming, annealing and removing a sand mold core; 5) welding a socket welding ring at the socket; 6) and a sealing ring is arranged in a sealing cavity of the socket, and an anti-falling ring is arranged in the anti-falling cavity. The sand mold core adopted is simple in manufacturing process, and the material is not easy to deform; the tube drawing operation speed of the tube drawing system of the centrifugal tube casting machine is set reasonably, and the quality of cast tubes is effectively ensured.
Description
Technical Field
The invention belongs to the field of manufacturing of nodular cast iron pipes, and particularly relates to a manufacturing process of a double-bellmouth nodular cast iron pipe.
Background
The most common type of nodular cast iron pipe joint is a socket-and-spigot sliding-in T-shaped joint, one end of the spigot of the nodular cast iron pipe is directly inserted into the socket of the other pipeline during installation, and the middle of the spigot is connected in a sealing mode through a sealing rubber ring. The spigot-and-socket type interface has the characteristics of simple structure, convenience in installation, good sealing property and the like. The interface can adapt to certain basic deformation, has certain shock resistance, utilizes its angle of deflection to realize the pipeline long distance turn to simultaneously.
In the prior art, in the manufacturing process of the ductile cast iron pipe, a sand mold core arranged on a casting steel core frame is an inner core mold of a bell mouth, and plays a role in preventing molten iron from leaking at the end part. In addition, the sealing cavity of the sand mold core and the model module corresponding to the anti-falling cavity are arranged, so that the casting shapes of the sealing cavity and the anti-falling cavity can be directly influenced, the working surface of the mold core mold in the prior art is single, and the cast sealing cavity and the cast anti-falling cavity are easily accumulated and lost due to molten iron to cause deformation influence. When a centrifugal pipe casting machine in the prior art performs pipe drawing, the speed of the centrifugal pipe casting machine is basically kept unchanged, if the set pipe drawing speed is too high, the shape of a cast pipe still in a high-temperature state is influenced due to drawing, the quality of the cast pipe is damaged, and if the speed is too low, the production and manufacturing efficiency of the cast pipe is influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a manufacturing process of a double-bellmouth nodular cast iron pipe, wherein the adopted sand mold core is simple in manufacturing process and not easy to deform; the tube drawing operation speed of the tube drawing system of the centrifugal tube casting machine is set reasonably, and the quality of cast tubes is effectively ensured.
In order to achieve the purpose, the invention adopts the technical scheme that:
a manufacturing process of a double-bellmouth nodular cast iron pipe comprises the following steps:
1) filling the dotted casting mould into a centrifugal pipe casting machine, and introducing cooling water into the outer wall of the casting mould for cooling; mounting the manufactured sand mold core on a cast steel core frame, and mounting the cast steel core frame to a female end of a pouring mold;
2) pouring molten iron into a fan-shaped bag of a centrifugal tube casting machine for pouring after spheroidization and slagging-off treatment;
3) starting a tube drawing system of the centrifugal tube casting machine, pouring molten iron into the inner wall of a casting mold, and starting tube drawing;
4) drawing out the double-bellmouth nodular cast iron pipe after drawing and forming, annealing and removing a sand mold core;
5) welding a socket welding ring at the socket;
6) and a sealing ring is arranged in a sealing cavity of the socket, and an anti-falling ring is arranged in the anti-falling cavity.
The manufacturing method of the sand mold core in the step 2) specifically comprises the following steps: the sand mold core is manufactured by adopting a cold core box manufacturing process, the washed sand, the phenolic resin and the polyisocyanate are uniformly mixed, the mixture is filled into the core box by using high-pressure air with the pressure of not less than 0.6MPa, and then triethylamine gas is blown into the core box to harden the mixture.
The concrete structure of the cast steel core frame in the step 2) is as follows: the cast steel core frame is provided with a lengthened core claw, the length of the lengthened core claw is 50-150 m, a reinforcing rib plate is arranged between the lengthened core claw and the core frame supporting ring, the lengthened core claw and the reinforcing rib plate are both made of cast steel, and the outer diameter of the cast steel lengthened core claw is consistent with the inner diameter of the straight pipe section of the bellmouth.
The concrete material for manufacturing the casting mould adopts 21CrMo 10; dotting the casting mold and the cambered surface section of the anti-falling cavity of the bellmouth, wherein the diameter of the dotted point is 1.5-4 mm, the distance between the dots is 0.5mm, and the depth of the dots is 0.15-0.4 mm; the length of the double-bellmouth nodular cast iron pipe body is set to be 5950-5850 mm.
When the tube drawing system of the centrifugal tube casting machine in the step 4) performs tube drawing, the drawing speed curve is controlled in a segmented mode, in a manual control section of a bell mouth, the traveling speed of a main machine of the centrifugal tube casting machine is instantly increased to 20-30 mm/s, the traveling distance of the main machine of the centrifugal tube casting machine is 160-365 mm, in a tube section of a tube body, the speed of the main machine of the centrifugal tube casting machine is controlled by a module to perform uniform linear motion, the traveling speed reaches 20-50 mm/s, the traveling distance of the main machine is 5550-5650 mm, the distance from a socket is 300mm, and the traveling speed of the main machine is gradually reduced to 0 from 30-40 mm/s through manual control.
The welding process of the welding ring in the step 6) comprises the following specific steps: the socket welding ring is welded at a position 110-215 mm away from the end of the socket; polishing the welding ring, and then installing a copper hoop at a fixed position, wherein the end face of the copper hoop is vertical to the axis of the cast pipe; wherein the copper hoop is made of T2; during welding, an FR Ni-1 pure nickel-iron welding wire is adopted, carbon dichloride is adopted as protective gas, and the gas flow of the protective gas is 15-25 m3And h, the width of the welding ring is 5-8 mm, and the height of the welding ring is 4-7 mm.
The sand mold core in the step 6) is provided with a sealing cavity sand mold and a bellmouth anti-falling cavity sand mold which correspond to the sealing cavity and the anti-falling cavity of the bellmouth of the nodular cast iron pipe; the sand mould of the anti-drop cavity is provided with a first working surface, a second working surface and a third working surface, and the first working surface is provided with a groove to ensure that the socket welding ring part is not damaged due to overlarge resistance force when the pipeline is subjected to axial pressure; the second working surface is of a spherical structure and is matched with the outer surface of the spherical anti-drop ring when the pipeline is installed, and when the pipeline is subjected to axial tension, the anti-drop ring can freely move in the spherical working surface on one hand, and is blocked by the socket welding ring on one side, so that an anti-skid anchoring effect is achieved; and the outermost third working surface is used for blocking molten iron flying out in high-speed rotation.
The circular anti-drop ring in the step 6) is formed by splicing at least two circular arc sections end to end; one end of each arc section is provided with a clamping block, and the other end of each arc section is provided with a bayonet matched with the clamping block; and the fixture block is provided with an extrusion part which is abutted against the side wall of the anti-drop cavity.
The invention has the following beneficial effects:
through the conflict effect that has elastic extrusion portion and anticreep intracavity wall on the fixture block, make on the firm locking socket of anticreep ring, enable the pipeline and allow certain displacement in axial direction, sealed interface offset angle is 3 ~5, can bear the expend with heat and contract with cold that environmental temperature changes the production when too big, can adapt to certain basic deformation, has stronger shock resistance, utilizes its angle of deflection to realize pipeline long distance simultaneously and turns to.
When the sand mold core is manufactured, the cold core box manufacturing process is adopted, the washed sand, the phenolic resin and the polyisocyanate are uniformly mixed, the mixture is filled into the core box by using high-pressure air of not less than 0.6MPa, and then triethylamine gas is blown in to harden the mixture.
The anti-drop cavity sand mold part is provided with three working surfaces, and a groove is reserved on the first working surface, so that when the pipeline is subjected to axial pressure, the welding ring part of the socket is not damaged due to overlarge resistance; the second working surface is of a spherical structure and is matched with the outer surface of the spherical anti-drop ring when the pipeline is installed, and when the pipeline is subjected to axial tension, the anti-drop ring can freely move in the spherical working surface on one hand, and is blocked by the socket welding ring on one side, so that an anti-skid anchoring effect is achieved; and the third working surface on the outermost layer is used for blocking molten iron flying out in high-speed rotation.
When the tube drawing system of the centrifugal tube casting machine draws tubes, different tube drawing speeds are set at different stages, so that the wall thickness of the casting socket is effectively ensured to meet the standard requirement, the production efficiency of the cast tubes is obviously improved, and the production quality of the cast tubes is ensured.
Drawings
FIG. 1 is a schematic view of the socket of the present invention in mating relationship with a spigot;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic view of the anti-slip ring structure;
FIG. 4 is a schematic view of a block structure of the anti-slip ring;
FIG. 5 is a view showing the U-shaped clip sandwiching the anti-drop ring and the outer wall of the socket;
fig. 6 is a schematic view of a sand mold core.
Detailed Description
The double-bellmouth nodular cast iron pipe as shown in fig. 1-6 comprises a pipe body, and a bellmouth 2 and a spigot 1 which are arranged at two ends of the pipe body, wherein the bellmouth 2 is provided with a sealing cavity 21 and an anti-falling cavity 22 from outside to inside at one time. The invention provides a manufacturing process of a double-bellmouth nodular cast iron pipe, which comprises the following steps:
1. filling the cast mould after dotting into a centrifugal pipe casting machine, and introducing cooling water into the outer wall of the cast mould for cooling; the manufactured sand mold core 6 is mounted on a cast steel core frame, and the cast steel core frame is mounted to the female end of the casting mold. Wherein the concrete material for manufacturing the casting mould adopts 21CrMo 10; dotting the cambered surface section of the anti-falling cavity sand mold part at the female end of the casting mold and the sand mold core 6, wherein the diameter of the dotted point is 1.5-4 mm, the distance between the dots is 0.5mm, and the depth of the dots is 0.15-0.4 mm; the length of the double-bellmouth nodular cast iron pipe body is set to be 5950-5850 mm.
2. And (4) spheroidizing and slagging-off the molten iron, and pouring the molten iron into a fan-shaped ladle of a centrifugal pipe casting machine for pouring. The manufacturing method of the sand mold core 6 comprises the following specific steps: the sand mold core 6 is manufactured by adopting a cold core box manufacturing process, the washed sand, the phenolic resin and the polyisocyanate are uniformly mixed, the mixture is filled into the core box by using high-pressure air with the pressure of not less than 0.6MPa, and then triethylamine gas is blown into the core box to be hardened. The manufacturing of the sand mold core 6 is simple, the material is cheap and durable, the manufactured sand mold core 6 is not easy to deform by heating, and the manufacturing quality is effectively ensured. As shown in fig. 6, the sand mold core 6 is provided with a sealing cavity sand mold part 62 and a bell mouth anti-falling cavity sand mold part corresponding to the sealing cavity 21 and the anti-falling cavity 22 of the nodular cast iron pipe bell mouth 2; the anti-drop cavity sand mold part is provided with a first working surface 611, a second working surface 612 and a third working surface 613, the first working surface 611 is provided with a groove, and the welding ring 11 part of the socket 1 is not damaged due to overlarge resistance force when the pipeline is subjected to axial pressure; the second working surface 612 is of a spherical structure, and is matched with the outer surface of the spherical anti-drop ring 4 when a pipeline is installed, and when the pipeline is subjected to axial tension, the anti-drop ring 4 can freely move in the spherical working surface on one hand, and is blocked by the welding ring 11 of the socket 1 on one hand, so that an anti-skid anchoring effect is achieved; the outermost third working surface 613 is used for blocking molten iron flying out from the high-speed rotation.
3. Starting an automatic pipe drawing system of the centrifugal pipe casting machine, pouring molten iron into the inner wall of a casting mold, and starting to draw a pipe; when a tube drawing system of the centrifugal tube casting machine draws tubes, a drawing speed curve is controlled in a segmented mode, in a manual control section of a bell mouth 2, the traveling speed of a main machine of the centrifugal tube casting machine is instantly increased to 20-30 mm/s, the traveling distance of the main machine of the centrifugal tube casting machine is 160-365 mm, in a tube section of a tube body, the speed of the main machine of the centrifugal tube casting machine is controlled by a module to perform uniform linear motion, the traveling speed reaches 20-50 mm/s, the traveling distance of the main machine is 5550-5650 mm, the distance from the main machine to a section 1300mm of a socket is gradually reduced to 0 from 30-40 mm/s, the wall thickness of the socket casting wall is guaranteed to meet the standard requirement, the production efficiency of the casting tube is remarkably improved, and the production quality of the casting tube. The cast steel core frame is provided with the lengthened core claw, the length of the lengthened core claw is 50-150 m, the reinforcing rib plate is arranged between the lengthened core claw and the core frame supporting ring, the lengthened core claw and the reinforcing rib plate are made of cast steel, the outer diameter of the cast steel lengthened core claw is consistent with the inner diameter of the straight pipe section of the bell mouth 2 of the cast pipe, the sand mold core 6 can be effectively grabbed, and pipe drawing operation is greatly facilitated.
4. And after drawing and forming, pulling out the double-bellmouth nodular cast iron pipe, annealing and removing the sand mold core 6.
5. Welding a socket 1 welding ring 11 at the socket 1; : the socket 1 welding ring 11 is welded at a position 110-215 mm away from the end of the socket 1; polishing the position of the welding ring 11, and then installing a copper hoop at a fixed position, wherein the end face of the copper hoop is vertical to the axis of the cast pipe; wherein the copper hoop is made of T2; during welding, an FR Ni-1 pure nickel-iron welding wire is adopted, carbon dichloride is adopted as protective gas, and the gas flow of the protective gas is 15-25 m3The width of the welding ring 11 is 5-8 mm, the height of the welding ring 11 is 4-7 mm, the quality of the welding ring 11 can be effectively guaranteed, the firmness of the welding ring 11 when the socket 1 is butted with the bell mouth 2 is guaranteed, and the welding ring 11 is prevented from being damaged due to mechanical butt joint, so that the overall quality of a pipeline is influenced.
6. The sealing ring 3 is installed in the sealing cavity 21 of the socket 2, and the anti-drop ring 4 is installed in the anti-drop cavity 22. As shown in fig. 3 and 4, the circular anti-drop ring 4 is formed by splicing at least two arc segments end to end; one end of each arc segment is provided with a clamping block 40, and the other end is provided with a bayonet 42 matched with the clamping block 40; the fixture block 40 is provided with a pressing part 41 which is pressed against the side wall of the anti-falling cavity 22; the latch 40 is made of elastic rubber. Through the conflict effect that has elastic extrusion portion 41 and anticreep chamber 22 inner wall on the fixture block 40, make anticreep ring 4 firm locking socket 1 on, enable the pipeline and allow certain displacement in axial direction, sealed interface offset angle is 3 ~5 to can bear the expend with heat and contract with cold that environmental temperature changes the production when too big, can adapt to certain basic deformation, have stronger shock resistance, utilize its angle of deflection to realize pipeline long distance simultaneously and turn to.
After the double-bellmouth nodular cast iron pipe is manufactured, a pipeline is arranged on an installation platform when the double-bellmouth nodular cast iron pipe is laid and installed; as shown in fig. 5, the U-shaped clip 5 is clamped between the anti-drop ring 4 and the outer wall of the socket 2, so that the pressing portion 41 arranged on the bayonet 42 of the anti-drop ring 4 is pressed to deform and is attached to the inner wall of the anti-drop cavity 22, and the anti-drop ring 4 is close to the inner wall of the anti-drop cavity 22 under the clamping action of the U-shaped clip, thereby enlarging the inner diameter of the circular anti-drop ring 4 and facilitating the inward insertion of the socket 1; then, the inner walls of the socket 1 and the socket 2 are coated with lubricating oil, and two adjacent pipelines are connected with the socket 1 through the socket 2; during butt joint, after the welding ring 11 on the socket 1 passes over the anti-drop ring 4, the U-shaped part clamped between the outer wall of the socket 2 and the anti-drop ring 4 is removed, the extrusion part 41 of the circular anti-drop ring 4 recovers deformation to enable the diameter of the anti-drop ring 4 to be reduced inwards, so that the anti-drop ring 4 is tightly attached to the socket 1 which is to be sleeved in the socket 2, and effective sealing, fixing and anti-drop effects are achieved.
Claims (8)
1. A manufacturing process of a double-bellmouth nodular cast iron pipe is characterized by comprising the following steps: the method comprises the following steps:
1) placing the cast mould after dotting into a centrifugal pipe casting machine, and introducing cooling water into the outer wall of the cast mould for cooling; mounting the manufactured sand mold core on a cast steel core frame, and mounting the cast steel core frame to a female end of a pouring mold;
2) pouring molten iron into a fan-shaped bag of a centrifugal tube casting machine for pouring after spheroidization and slagging-off treatment;
3) starting a tube drawing system of the centrifugal tube casting machine, pouring molten iron into the inner wall of a casting mold, and starting tube drawing;
4) after drawing and forming, drawing out the double-bellmouth nodular cast iron pipe, annealing and removing a sand mold core;
5) welding a socket welding ring at the socket;
6) and a sealing ring is arranged in the sealing cavity of the socket, and an anti-falling ring is arranged in the anti-falling cavity.
2. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 1, wherein: the manufacturing method of the sand mold core in the step 2) specifically comprises the following steps: the sand mold core is manufactured by adopting a cold core box manufacturing process, the washed sand, the phenolic resin and the polyisocyanate are uniformly mixed, the mixture is filled into the core box by using high-pressure air with the pressure of not less than 0.6MPa, and then triethylamine gas is blown into the core box to harden the mixture.
3. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 2, wherein: the concrete structure of the cast steel core frame in the step 2) is as follows: the cast steel core frame is provided with a lengthened core claw, the length of the lengthened core claw is 50-150 m, a reinforcing rib plate is arranged between the lengthened core claw and the core frame supporting ring, the lengthened core claw and the reinforcing rib plate are both made of cast steel, and the outer diameter of the cast steel lengthened core claw is consistent with the inner diameter of the straight pipe section of the bellmouth.
4. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 1, wherein: the concrete material for manufacturing the casting mold in the step 3) adopts 21CrMo 10; dotting the casting mold and the cambered surface section of the anti-falling cavity of the bellmouth, wherein the diameter of the dotted point is 1.5-4 mm, the distance between the dots is 0.5mm, and the depth of the dots is 0.15-0.4 mm; the length of the double-bellmouth nodular cast iron pipe body is set to be 5950-5850 mm.
5. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 1, wherein: when the tube drawing system of the centrifugal tube casting machine in the step 4) performs tube drawing, the drawing speed curve is controlled in a segmented mode, in a bell mouth manual control section, the traveling speed of a main machine of the centrifugal tube casting machine is instantly increased to 20-30 mm/s, the traveling distance of the main machine of the centrifugal tube casting machine is 160-365 mm, in a tube section of a tube body, the speed of the main machine of the centrifugal tube casting machine is controlled by a module to perform uniform linear motion, the traveling speed reaches 20-50 mm/s, and the traveling distance of the main machine is 5550-5650 mm; and in a section 300mm away from the socket, the walking speed of the manual control host machine is gradually reduced from 30-40 mm/s to 0 mm/s.
6. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 1, wherein: step (ii) of6) The welding process of the middle welding ring comprises the following specific steps: the socket welding ring is welded at a position 110-215 mm away from the end of the socket; polishing the welding ring, and then installing a copper hoop at a fixed position, wherein the end face of the copper hoop is vertical to the axis of the cast pipe; wherein the copper hoop is made of T2; during welding, an FR Ni-1 pure nickel-iron welding wire is adopted, carbon dichloride is adopted as protective gas, and the gas flow of the protective gas is 15-25 m3And h, the width of the welding ring is 5-8 mm, and the height of the welding ring is 4-7 mm.
7. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 6, wherein: the sand mold core in the step 6) is provided with a sealing cavity sand mold and a bellmouth anti-falling cavity sand mold which correspond to the sealing cavity and the anti-falling cavity of the bellmouth of the nodular cast iron pipe; the sand mould of the anti-drop cavity is provided with a first working surface, a second working surface and a third working surface, and the first working surface is provided with a groove to ensure that the socket welding ring part is not damaged due to overlarge resistance force when the pipeline is subjected to axial pressure; the second working surface is of a spherical structure and is matched with the outer surface of the spherical anti-drop ring when the pipeline is installed, and when the pipeline is subjected to axial tension, the anti-drop ring can freely move in the spherical working surface on one hand, and is blocked by the socket welding ring on one side, so that an anti-skid anchoring effect is achieved; and the outermost third working surface is used for blocking molten iron flying out in high-speed rotation.
8. The process for manufacturing a double-bellmouth ductile cast iron pipe according to claim 7, wherein: the circular anti-drop ring in the step 6) is formed by splicing at least two circular arc sections end to end; one end of each arc section is provided with a clamping block, and the other end of each arc section is provided with a bayonet matched with the clamping block; and the fixture block is provided with an extrusion part which is abutted against the side wall of the anti-drop cavity.
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| CN114082915A (en) * | 2021-10-27 | 2022-02-25 | 新兴铸管股份有限公司 | Socket preparation method based on novel recycled core |
| CN115059807A (en) * | 2022-06-30 | 2022-09-16 | 安钢集团永通球墨铸铁管有限责任公司 | Short-length micro jacking pipe and manufacturing process thereof |
| CN116673455A (en) * | 2023-08-03 | 2023-09-01 | 江苏日升电力机械有限公司 | Manufacturing equipment and process for double-socket nodular cast iron pipe |
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