CN113198997A - Centrifugal casting method for flange pipe - Google Patents
Centrifugal casting method for flange pipe Download PDFInfo
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- CN113198997A CN113198997A CN202110387275.5A CN202110387275A CN113198997A CN 113198997 A CN113198997 A CN 113198997A CN 202110387275 A CN202110387275 A CN 202110387275A CN 113198997 A CN113198997 A CN 113198997A
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- pipe
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- flange
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- lower half
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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
- B22D13/023—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being horizontal
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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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- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a centrifugal casting method of a flange pipe. The production steps of the method mainly comprise: 1) the upper half die and the lower half die are respectively assembled on a riding wheel station and a turnover machine, the flange inner modules embedded in the concave rings are respectively used for positioning a spring and compressing a foam block, the flange inner modules are compressed by the pipe end inner modules, and the flange inner modules are assembled with the upper half die, the lower half die and the pipe end inner modules by adopting inclined planes. 2) Assembling a pipe die: the matched upper pipe die is hung to a riding wheel station and is combined with the lower pipe die in a positioning way, and roller ring rings are sleeved at two ends of the pipe die. 3) And (4) cleaning a coating and detecting dynamic balance. 4) Spraying the coating and centrifugally casting. 5) And (4) disassembling the pipe die, hanging away from the flange pipe, and disassembling the pipe end inner module and the flange inner module. The flange pipe can be cast in one step by adopting the method, so that the welding procedure is saved, the welding defect is eliminated, and the quality consistency of the flange pipe is ensured.
Description
Technical Field
The invention is applied to the field of centrifugal casting, and particularly relates to a horizontal pipe die for centrifugal casting by a hot die method.
Background
The flange pipe refers to a pipeline with flanges welded at two ends, and as shown in figure 1, bolt holes are processed in the flange 1 and used for bolt connection of the flange pipe. For some austenitic stainless steel or nickel alloy steel cast pipes, the welding of the flanges results in coarse grains in the heat affected zone, which affects the pipe properties, such as corrosion resistance, fatigue resistance, etc. If the flange plates of the flange pipes and the pipelines are centrifugally cast together, the shrinkage of the cast pipes is blocked due to the flange plates, so that cracks and waste products are generated, and the structure of the pipe die cannot be demoulded due to the flange plates at two ends, so that the flange pipes are mostly manufactured in a welding mode.
Disclosure of Invention
The technical problem solved by the invention is as follows: the centrifugal casting method for the flange pipe is provided, so that the centrifugal casting of the flange pipe by adopting a hot die method becomes possible, the welding procedure of a flange plate is omitted, and the welding defects are eliminated.
The technical scheme adopted by the invention is as follows: the centrifugal casting method of the flange pipe adopts the centrifugal casting of a cylindrical pipe die combined by a semicircular upper half die and a semicircular lower half die, semi-convex rings are symmetrically processed at the left and right parts of the upper half die and the lower half die, and an auxiliary roller belt is processed between the middle parts of the upper half die and the lower half die and the semi-convex rings. The upper half-convex ring and the lower half-convex ring which are matched with each other are sleeved with the roller belt ring. The left end and the right end of the upper half die and the lower half die are provided with concave rings, and flange inner modules, springs, foam blocks and pipe end inner modules are assembled in the concave rings; the flange inner module is four symmetrical blocks which are embedded in the concave rings of the upper half die and the lower half die, the back of the flange inner module and the cavity of the concave ring are provided with a spring and a foam block, the foam block is made of polypropylene and meets the material, and the softening temperature is 180-220 ℃. The centrifugal casting method mainly comprises the following steps:
1) assembling an upper half die and a lower half die: the lower half die is assembled on a riding wheel station, and the upper half die is assembled on a turnover machine; the assembly methods of the upper half die and the lower half die are consistent, the flange inner modules embedded in the concave rings of the upper half die and the lower half die are respectively provided with a positioning spring and a pressing foam block, the semicircular pipe end inner modules are used for pressing the two flange inner modules, and the pipe end inner modules and the upper half die and the lower half die are connected by fasteners so that the concave cambered surfaces of the pipe end inner modules are flush with the inner surface of the pipe die; the flange inner module, the upper half module, the lower half module and the pipe end inner module are assembled by a circular truncated cone inclined plane, and the inclination angle of the circular truncated cone inclined plane is 15 degrees.
2) Assembling a pipe die: the turnover machine turns over the assembled upper pipe die, the crown block lifts the upper pipe die to the riding wheel station to be combined with the lower pipe die in a positioning mode, the two ends of the pipe die are sleeved with the roller ring rings, and the roller ring rings and the pipe die semi-convex ring are fastened through the fastening piece.
3) And (4) cleaning a coating and detecting dynamic balance.
4) Baking a pipe die, spraying paint, installing a baffle plate, and centrifugally casting.
5) Disassembling the pipe die: hanging the cooled pipe die and the flange pipe to a riding wheel station, placing an auxiliary roller belt on the riding wheel, and aligning the rotary pipe die; and (3) disassembling baffles and roller belt rings at two ends of the pipe die, hanging the pipe die from the upper half die to the turnover machine, hanging the pipe die from the flange pipe, disassembling the pipe end inner module and the flange inner module, and cleaning the concave rings of the upper half die and the lower half die.
The invention has the beneficial effects that: the flange pipe can be cast in one step by adopting the method, so that the welding procedure is saved, the welding defect is eliminated, and the quality consistency of the flange pipe is ensured. The produced flange plate and the pipe body are subjected to heat treatment at the same time, the tissues are uniform, the corrosion resistance and the thermal fatigue resistance of the austenitic stainless steel or the nickel-based alloy steel are ensured, the service life of certain key parts is prolonged, and the safe operation of the pipeline is ensured.
Drawings
FIG. 1 is a schematic view of a flange structure;
FIG. 2 is a schematic cross-sectional front view of the present invention;
FIG. 3 is a schematic top view of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 2;
FIG. 5 is a cross-sectional view E-E of FIG. 2;
wherein: 1-flange plate, 2-upper half mould, 3-wedge, 4-baffle, 5-flange inner module, 6-spring, 7-lower half mould, 8-foam block, 9-pipe end inner module, 10-auxiliary roller belt, 11-lifting lug, 12-sand core, 13-inner baffle, 14-outer baffle, 15-roller belt ring, 16-semi convex ring.
Detailed Description
The present invention will be described in detail with reference to fig. 2 to 5, wherein the upper, lower, left and right sides of fig. 2 are based on fig. 2. The inner and outer parts refer to the inner and outer parts of the pipe die, the axial direction refers to the direction of the rotating shaft of the pipe die, and the radial direction refers to the direction of the diameter of the pipe die. The tube die is of cylindrical configuration and the centre line has been omitted from some of the drawings to facilitate the illustration of the structure.
The pipe die used by the invention comprises an upper half die 2 and a lower half die 7, wherein the upper half die 2 and the lower half die 7 are both semicircular pipe dies which are symmetrical and consistent, and the two are combined together to form an integral cylindrical pipe die. The upper half die 2 and the lower half die 7 are provided with steps at the mutually matched positions, as shown in figure 4, the structure can realize the positioning combination of the upper half die and the lower half die, and can avoid steel throwing accidents. From the precise positioning angle, the upper half die and the lower half die take the mutually matched conical positioning pin and positioning hole as the best to prevent the collision of the steps when the upper half die and the lower half die are assembled and protect the steps. Once the coating falls off in the molten steel pouring process, the molten steel has the risk of being centrifugally thrown out from the combined gap, the combined gap channel of the structure is longer, and the molten steel leaking into the combined gap can be solidified and blocked, so that the steel throwing accident is avoided.
The left end and the right end of the inner surface of the pipe die are provided with concave rings, the concave rings are internally provided with flange inner modules 5, springs 6, foam modules 8 and pipe end inner modules 9, the pipe end inner modules 9 are semicircular and are respectively connected with upper half die fasteners and lower half die fasteners, the concave arc surfaces of the pipe end inner modules 9 are flush with the inner surface of the pipe die, and whether the semicircular end surfaces of the pipe end inner modules 9 are provided with matching steps or not is determined by the thickness and the size of the steps. The flange inner module 5 is divided into four symmetrical blocks, as shown in figure 5, and is respectively embedded in the concave rings of the upper half die and the lower half die, the flange inner module 5 is assembled with the upper half die, the lower half die and the pipe end inner module 9 in a circular truncated cone inclined plane, the inclined angle determines the stress of the axial movement of the flange inner module, the inclined angle of the embodiment is 15 degrees, the back surface (invisible) of the flange inner module 5 and the cavity of the concave ring are provided with a spring 6 and a foam block 8, the foam block 8 is made of polypropylene composite material, the softening temperature is 180-220 ℃, before the molten steel is poured, the foam block 8 positions the flange inner module 5, when the pipe die rotates at a high speed, the flange inner module 5 is fixed, after high-temperature molten steel is poured, the heat of the molten steel is transferred to the foam module 8, the foam module 8 is heated and softened, and when the flange plate 1 on the flange pipe contracts, the flange inner module 5 can move towards the contraction direction of the flange pipe without influencing the contraction of the flange pipe. The purpose of the spring 6 is to stabilize the flange inner module 5 after the foam block 8 is softened, and to avoid the deviation caused by irregular movement of the flange inner module 5 in a concave ring, thereby influencing the dynamic balance of the high-speed rotation of the pipe die. That is to say, even if the softening speed of the foam block 8 is inconsistent, the position of the eight flange inner modules 5 at the two ends of the pipe die is relatively consistent due to the stabilizing effect of the spring 6, the stress is relatively balanced, and the dynamic balance of the pipe die cannot be damaged. In the moving process, the inner flange module 5 moves outwards in the radial direction due to sliding along the inclined plane of the circular truncated cone and forms a cavity with the outer surface of the flange pipe, the cavity is communicated with the cavity in the concave ring, coatings peeled off due to shrinkage of the flange pipe can be collected, and shrinkage resistance caused by peeling off of the coatings is avoided.
And (3) processing sockets with rabbets at two ends of the pipe die, after the pipe die combined coating is sprayed, installing the baffle 4 to be close to the rabbets, and knocking the inclined iron 3 on the sockets to fix the baffle 4 to pour. If bolt holes in the flange plate are required to be cast together, the flange plate can be assembled according to the mode of the right end of the attached drawing 1, a groove for installing the sand core 12 is processed on the flange inner module 5, the sand core 12 is broken to form the bolt holes, the baffle plate is divided into an inner baffle plate 13 and an outer baffle plate 14, the inner baffle plate 13 is mainly used for fixing the sand core 12, and the outer baffle plate 14 is mainly used for fixing the inner baffle plate 13.
The method for centrifugally producing the flange pipe by adopting the horizontal combined pipe die hot-die method comprises the following steps:
1. the upper and lower mold halves are assembled. The lower half mould 7 is assembled on the riding wheel, and the upper half mould 2 is assembled on the turnover machine. The assembly methods of the upper half die and the lower half die are consistent, the two flange inner modules 5 are respectively provided with the positioning spring 6 and the compression foam block 8, the two flange inner modules 5 are compressed by the semicircular pipe end inner module 9, and the pipe end inner module 9 is connected with the upper half die and the lower half die by fasteners, so that the concave cambered surface of the pipe end inner module 9 is flush with the inner surface of the pipe die. The flange inner module 5 and the upper and lower half modules as well as the pipe end inner module 9 are assembled by a circular truncated cone inclined surface, and in order to reduce the sliding resistance of the flange inner module 5, high-temperature lubricating grease can be coated on the circular truncated cone inclined surface.
2. And (5) assembling the pipe die. The turning machine turns over the assembled upper half die 2, the crown block is lifted to a riding wheel station, the step positioning or the positioning pin is positioned, the upper half die and the lower half die are combined, the roller ring rings 15 are sleeved at the two ends of the pipe die and matched with the semi-convex rings 16 of the upper half die and the lower half die, and the roller ring rings 15 and the semi-convex rings 16 are fastened by the fastening piece.
3. And (4) cleaning a coating and detecting dynamic balance. And (4) hoisting the assembled pipe die to a station of a centrifugal machine, cleaning the coating at a low rotating speed, and then carrying out dynamic balance inspection at a high rotating speed. The dynamic balance can be adjusted by adding a washer or nut to the fastener, or by other methods.
4. Baking the pipe die and spraying the coating. The baking temperature of the pipe die is not more than 150 ℃ and 170 ℃ so as to keep the strength of the foam block 8, and the coating is sprayed by a hot die. The recesses of the pipe end inner mould block 9 fasteners are filled flush with paint before the coating is sprayed.
5. And (4) baffle plate feeding and centrifugal casting. And (4) installing baffles at two ends of the pipe die, and centrifugally pouring molten steel. Before the molten steel is poured, the pipe die rotates at a high speed, the inner die block 5 of the flange is mainly positioned by the foam block 8, after the molten steel is poured, before the foam block 8 is softened, part of the molten steel is solidified, but at the moment, the high-temperature cast steel is high-temperature austenite in structure, the plasticity is good, and cracks cannot be generated. Shrinkage cracks are mostly generated by the solid shrinkage resistance after solidification, and before the solid shrinkage, the foam block 8 is softened, and the spring 6 does not resist the shrinkage of the flange pipe enough, so that the shrinkage of the flange pipe is not hindered, and the shrinkage cracks are eliminated.
6. And cooling and disassembling the pipe die. And after the molten steel is poured, controlling the temperature of the pipe die to be not more than 300 ℃ by water spray cooling (the temperature is the simulated temperature of the computer and is not the temperature measured by an infrared temperature measuring gun). After the pipe die and the flange pipe are cooled, the pipe die is hung to a riding wheel station, the auxiliary roller belt 10 is placed on the riding wheel, and the pipe die is rotated to be aligned, so that the matching surface of the upper half die 2 and the lower half die 7 is approximately horizontal. Dismantling the baffles at two ends of the pipe die, then dismantling the roller belt ring 15, hanging the upper half die 2 to the turnover machine, hanging the flange pipe, dismantling the pipe end inner module 9 and the flange inner module 5, cleaning paint and foam block residue in the concave ring of the upper half die and the lower half die by using compressed air, then executing the step 1, installing the foam block 8, carrying out half die assembly, and repeating the steps.
The flange pipe is produced by centrifugal casting, a centrifugal station, a riding wheel station and a tilter are matched, the production efficiency of a single pipe die is low, and two pipe dies and three stations are required to operate simultaneously. The flange pipe can be cast in one step by adopting the method, so that the welding procedure is saved, the welding defect is eliminated, and the quality consistency of the flange pipe is ensured.
The flange plate and the pipe body of the flange pipe which is centrifugally cast by the invention are subjected to heat treatment simultaneously, the tissues are uniform, the corrosion resistance and the thermal fatigue resistance of the austenitic stainless steel or the nickel-based alloy steel are ensured, the service life of certain key parts in petrochemical engineering places is prolonged, and the safe operation of pipelines is ensured.
Claims (3)
1. A centrifugal casting method of a flange pipe adopts a cylindrical pipe die formed by combining a semicircular upper half die (2) and a semicircular lower half die (7) for centrifugal casting, semi-convex rings (16) are symmetrically processed at the left and right parts of the upper half die (2) and the lower half die (7), an auxiliary roller belt (10) is processed between the middle parts of the upper half die and the lower half die and the semi-convex rings (16), and a roller belt ring (15) is sleeved on the upper semi-convex ring (16) and the lower semi-convex ring (16) which are matched with each other; the left end and the right end of the upper half die (2) and the lower half die (7) are provided with concave rings, and flange inner modules (5), springs (6), foam blocks (8) and pipe end inner modules (9) are assembled in the concave rings; the flange inner modules (5) are four symmetrical blocks, are embedded in the concave rings of the upper half die (2) and the lower half die (7), and are provided with springs (6) and foam blocks (8) at the back of the flange inner modules (5) and in the cavity of the concave ring; the centrifugal casting method mainly comprises the following steps:
1) assembling an upper half die and a lower half die: the lower half die (7) is assembled on a riding wheel station, and the upper half die (2) is assembled on a turnover machine; the inner flange modules (5) embedded in the concave rings of the upper half die and the lower half die are provided with positioning springs (6) and pressing foam blocks (8), the two inner flange modules (5) are pressed by the semicircular pipe end inner modules (9), and the pipe end inner modules (9) are connected with the upper half die and the lower half die through fasteners, so that the concave cambered surfaces of the pipe end inner modules (9) are flush with the inner surface of the pipe die; the flange inner module (5) and the upper and lower half moulds as well as the flange inner module (5) and the pipe end inner module (9) are assembled by adopting a circular truncated cone inclined surface;
2) assembling a pipe die: the overturning machine overturns the assembled upper pipe die (2), the crown block lifts the upper pipe die (2) to a riding wheel station to be positioned and combined with the lower pipe die (7), roller ring rings (15) are sleeved at two ends of the pipe die, and a fastener is connected with the roller ring rings (15) and a semi-convex ring (16);
3) cleaning a coating and detecting dynamic balance;
4) baking a pipe die, spraying a coating, mounting a baffle plate, and centrifugally casting;
5) disassembling the pipe die: hanging the cooled pipe die and the flange pipe to a riding wheel station, placing an auxiliary roller belt (10) on the riding wheel, and aligning the rotary pipe die; the baffle plates at the two ends of the pipe die and the roller belt rings (15) are disassembled, the pipe die is lifted from the upper half die to the turnover machine, the flange pipe is lifted, the pipe end inner module (9) and the flange inner module (5) are disassembled, and the concave rings of the upper half die and the lower half die are cleaned.
2. A method of centrifugally casting a flange pipe according to claim 1, wherein: the foam block (8) is made of polypropylene composite material, and the softening temperature is 180-220 ℃.
3. A method of centrifugally casting a flange pipe according to claim 1, wherein: the inclined angle of the circular truncated cone inclined surface of the inner module (5) of the assembly flange is 15 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387275.5A CN113198997A (en) | 2021-04-12 | 2021-04-12 | Centrifugal casting method for flange pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387275.5A CN113198997A (en) | 2021-04-12 | 2021-04-12 | Centrifugal casting method for flange pipe |
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| Publication Number | Publication Date |
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| CN113198997A true CN113198997A (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110387275.5A Pending CN113198997A (en) | 2021-04-12 | 2021-04-12 | Centrifugal casting method for flange pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116967648A (en) * | 2023-09-22 | 2023-10-31 | 淄博永晟精陶科技有限公司 | Silicon carbide pipe welding device |
-
2021
- 2021-04-12 CN CN202110387275.5A patent/CN113198997A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116967648A (en) * | 2023-09-22 | 2023-10-31 | 淄博永晟精陶科技有限公司 | Silicon carbide pipe welding device |
| CN116967648B (en) * | 2023-09-22 | 2023-12-19 | 淄博永晟精陶科技有限公司 | Silicon carbide pipe welding device |
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