CN115283626A - Hollow steel ingot casting mold and using method thereof - Google Patents
Hollow steel ingot casting mold and using method thereof Download PDFInfo
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- CN115283626A CN115283626A CN202210933486.9A CN202210933486A CN115283626A CN 115283626 A CN115283626 A CN 115283626A CN 202210933486 A CN202210933486 A CN 202210933486A CN 115283626 A CN115283626 A CN 115283626A
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- steel ingot
- ingot
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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
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
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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
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/04—Casting hollow ingots
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Abstract
The invention discloses a hollow steel ingot casting mold and a using method thereof, and relates to the technical field of mold design for hollow steel ingot production. The steel ingot mould comprises a cylindrical steel ingot mould, wherein a lantern ring is arranged in the center of the bottom of the inner side of the cylindrical steel ingot mould, molten steel injection holes are symmetrically formed in the bottom of the inner side of the cylindrical steel ingot mould, the lantern ring is of an outwards-protruding annular structure at the bottom of the cylindrical steel ingot mould, a central rod is inserted into the lantern ring, the central rod extends towards the opening at the upper end of the cylindrical steel ingot mould, a fixing frame is arranged on the outer side of the cylindrical steel ingot mould, a pressing plate is connected to one side of the fixing frame through bolts, and the lower end of the pressing plate and the upper end of the central rod are fixed in an extrusion mode through adjusting bolts. The invention overcomes the defects of the prior art, effectively and conveniently controls the processing length of the hollow steel ingot, is convenient for subsequent demoulding and controlling the casting process, prevents the hollow steel ingot from generating cracks and improves the yield.
Description
Technical Field
The invention relates to the technical field of mold design for hollow steel ingot production, in particular to a hollow steel ingot casting mold and a using method thereof.
Background
The hollow steel ingot is mainly used for producing large-caliber seamless pipes, burrs of an inner hole of the produced hollow steel ingot are removed, a cap opening is cut off, and the hollow steel ingot can be directly hot-threaded into a seamless steel pipe after being heated.
However, the existing hollow steel ingot is difficult to demould in the production process of adopting a mould, and the steel ingot is easy to crack in the processing process, which brings great trouble to the actual processing.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the hollow steel ingot casting mold and the use method thereof, which effectively and conveniently control the processing length of the hollow steel ingot, simultaneously facilitate the subsequent demolding, facilitate the control of the casting process, prevent the hollow steel ingot from generating cracks and improve the yield.
In order to achieve the purpose, the invention adopts the following technical scheme:
the hollow steel ingot casting mold comprises a cylindrical steel ingot mold, wherein a lantern ring is arranged in the center of the bottom of the inner side of the cylindrical steel ingot mold, molten steel injection holes are symmetrically formed in the bottom of the inner side of the cylindrical steel ingot mold, the lantern ring is of an outwards-protruding annular structure at the bottom of the cylindrical steel ingot mold, a center rod is inserted into the lantern ring, the center rod extends towards an opening at the upper end of the cylindrical steel ingot mold, a fixing frame is arranged on the outer side of the cylindrical steel ingot mold, a pressing plate is connected to one side of the fixing frame through a bolt, and the lower end of the pressing plate and the upper end of the center rod are extruded and fixed through an adjusting bolt.
Preferably, the center rod is composed of a plurality of sleeves, the sleeves are of a hollow annular structure, the sleeves are mullite, the outer layer of each sleeve is coated with a high-temperature-resistant coating, the outer diameter of each sleeve is smaller than the inner diameter of each sleeve ring, a convex ring is arranged at one end of each sleeve, a groove matched with the convex ring is formed in the other end of each sleeve, and the sleeves are sequentially overlapped, stacked and built to the required height through the convex rings and the grooves in a mutually matched mode.
Preferably, a filling layer is arranged in the hollow part in the sleeve, and the filling layer is quartz sand with the granularity of 1-3 mm.
Preferably, a cap opening with adjustable height is hung at the opening at the upper end of the cylindrical ingot mould.
Preferably, the molten steel injection hole has a circular truncated cone structure with a small top and a large bottom.
Preferably, the diameter of the upper opening of the molten steel injection hole is 122 +/-2 mm, and the diameter of the lower opening is 145 +/-2 mm.
Preferably, the lantern ring is in a shape of a ring-shaped bevel-opening bulge, the longitudinal section of the lantern ring is in a right-angled triangle shape, and the inner diameter of the lantern ring is 20% -30% of the inner diameter of the bottom of the cylindrical ingot mold.
Preferably, the cylindrical ingot mold has a shape with a smaller lower part and a larger upper part as a whole, and the ratio of the inner diameter of the upper opening to the inner diameter of the lower opening is 1.01 to 1.015.
Preferably, the cylindrical ingot mould consists of the following elements in percentage by mass: c:3.0% -4.0%, si:1.0% -2.0%, mn:0.3 to 1.0 percent of the total weight of the alloy, less than or equal to 0.15 percent of P, less than or equal to 0.15 percent of S, and the balance of Fe and inevitable impurities.
A use method of a hollow steel ingot casting mold comprises the following steps: the method comprises the following steps:
(1) cleaning the inside of the mould, baking the whole casting system to 70-90 ℃, and laying a layer of covering slag at the bottom of the mould, wherein the adding amount of the covering slag is 0.1-0.2% of the weight of the cast steel ingot;
(2) after the refined molten steel is qualified in components and temperature, the refined molten steel is hoisted to a casting station to start casting, the molten steel flows into injection holes at the bottom of an ingot mold from a steel flowing system, the molten steel flows into the two injection holes simultaneously, the rising speed of the molten steel in the mold is controlled to be not higher than 0.2m/min, and after the ingot mold is filled with the molten steel, a heating agent and a heat-preservation covering agent are added to a cap opening;
(3) and (3) demoulding after the cast steel ingot is shaped, polishing an inner hole smoothly by using an inner hole polisher, and cutting off a cap opening of the steel ingot to be directly used for subsequent production.
Compared with the prior art, the invention provides a hollow steel ingot casting mold and a using method thereof, and the hollow steel ingot casting mold has the following beneficial effects:
1. according to the invention, through the arrangement of the pressing plate and the central rod made of a plurality of sleeves, the height of the integral central rod can be effectively controlled, steel ingots with different heights can be conveniently cast, the stability of the position of the central rod is controlled through the pressing plate, the stability of the casting process is ensured, and the subsequent demolding treatment is facilitated through the arrangement of the lantern ring with the bevel opening;
2. according to the invention, the speed of casting molten steel is controlled through the two molten steel injection holes, so that the stability of a steel ingot cooling process is effectively ensured, cracks are prevented, and meanwhile, the cooling uniformity of the steel ingot is ensured through the arrangement of the mold, so that the stability of the performance of the steel ingot is ensured.
Drawings
FIG. 1 is a schematic front sectional view of the present invention;
FIG. 2 is a schematic front sectional view of a cylindrical ingot mold according to the present invention;
FIG. 3 is a schematic top view of a cylindrical ingot mold according to the present invention;
fig. 4 is a schematic structural view of the bushing of the present invention.
In the figure: 1. a cylindrical ingot mold; 2. a collar; 3. injecting molten steel into a hole; 4. a center bar; 401. a sleeve; 402. a convex ring; 403. a groove; 5. a filling layer; 6. and (7) pressing a plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
referring to fig. 1-4, a hollow ingot casting mold employs a C:3.0% -4.0%, si:1.0% -2.0%, mn:0.3 to 1.0 percent of the total weight of the steel ingot, less than or equal to 0.15 percent of P, less than or equal to 0.15 percent of S, and the balance of Fe and inevitable impurity elements to prepare a cylindrical steel ingot mold 1, wherein the inner diameter of the cylindrical steel ingot mold 1 is generally more than 500mm, two molten steel injection holes 3 are formed in two sides of the bottom of the cylindrical steel ingot mold 1, an inclined-mouth lantern ring 2 is arranged in the center of the bottom of the cylindrical steel ingot mold 1 and used for positioning a central rod 4, the height of the lantern ring 2 is generally 30 to 50mm, the longitudinal section of the lantern ring 2 is a right-angled triangle, the inner diameter of the lantern ring 2 is 20 to 30 percent of the inner diameter of the cylindrical steel ingot mold 1, and the lantern ring 2 can replace a stretch-breaking line in the steel ingot cooling process, when a cast steel ingot is cooled in the mold, the volume of the steel ingot can be reduced, the inclined-mouth lantern ring 2 can prevent the steel ingot from shrinking downwards, the bottom of the steel ingot and the bottom of the steel ingot mold can automatically separate from the steel ingot mold, so as to facilitate the subsequent steel ingot mold to be demolded; the outer layer of the central rod 4 is composed of a plurality of mullite sleeves 401, the surfaces of the sleeves 401 are coated with high-temperature-resistant coatings, two ends of each sleeve 401 are respectively provided with a convex ring 402 and a groove 403 which are mutually matched, the sleeves 401 are mutually matched and stacked to corresponding heights, the upper end of the uppermost sleeve 401 is provided with a pressing plate 6 for preventing the sleeves from loosening, the pressing plate 6 is fixed by bolts to ensure the stability of the central rod 4, and the pressing plate 6 is connected with a fixing frame outside the cylindrical ingot mould 1.
Example 2:
referring to fig. 1 to 4, this embodiment is substantially the same as embodiment 1, and preferably, the inner hole of the sleeve 401 is filled with 1 to 3mm dry quartz sand as a filling layer 5, wherein the quartz sand is baked at a temperature of 120 ℃ or more to a dry state and filled into the core of the center rod 4. The cast steel ingot can shrink towards the center in the cooling process, quartz sand is filled in the steel ingot, the central rod 4 can have a certain shrinkage space, after the quartz sand is filled in the steel ingot, the fixing bolt is screwed, downward pressure is applied to the central rod 4, the central rod 4 is prevented from inclining, and the central rod 4 is prevented from floating upwards in the casting process.
Example 3:
referring to fig. 1 to 4, this embodiment is substantially the same as embodiment 2, and preferably, the cylindrical ingot mold 1 has a shape with a smaller lower part and a larger upper part as a whole, and the ratio of the inner diameter of the upper opening to the inner diameter of the lower opening is in the range of 1.01 to 1.015, which facilitates subsequent demolding; meanwhile, transverse cracks are prevented from occurring in the die after the steel ingot is cast, the upper opening of the cylindrical steel ingot die 1 is not provided with a cap opening snapping line, the cap opening is fixed on the upper opening of the steel ingot die in a suspension mode, and the steel ingot casting with different weights can be realized only by adjusting the suspension height of the cap opening.
And two axisymmetrical molten steel injection holes 3 are arranged at the bottom of the cylindrical ingot mould 1, the diameter of the upper opening of each injection hole is 122 +/-2 mm, the diameter of the lower opening of each injection hole is 145 +/-2 mm, molten steel can be simultaneously injected from the two injection holes, and the molten steel can be simultaneously injected from two holes, so that the internal structure of the cast ingot is more uniform and compact.
Example 4:
casting was carried out by means of the cylindrical ingot mould 1 obtained in example 3 above:
(1) cleaning the inside of the mould, baking the whole casting system to 70-90 ℃, and laying a layer of covering slag at the bottom of the mould, wherein the adding amount of the covering slag is 0.1-0.2% of the weight of the cast steel ingot;
(2) the superheat degree of the casting molten steel is controlled at 80-120 ℃, the refined molten steel is lifted to a casting station to start casting after the components and the temperature are qualified, the molten steel flows into an injection hole at the bottom of an ingot mold from a steel flowing system, the molten steel flows into the two injection holes simultaneously, the rising speed of the molten steel in the mold is controlled to be not higher than 0.2m/min, the rising speed is too high, a quenching layer on the outer surface of the steel ingot is thin, and the thin quenching layer can generate longitudinal cracks due to cooling shrinkage in the cooling process of the cast steel ingot in the mold; in addition, the mullite sleeve can crack due to the excessively high rising speed; after the ingot mould is filled with molten steel, a heating agent and a heat-insulating covering agent are added to the top of the cap.
(3) After the cast steel ingot waits for a certain time, demoulding operation can be carried out, the mullite sleeve removed from the center rod of the steel ingot can be bonded on the steel ingot, and the mullite sleeve can be taken out through simple crushing operation;
(4) and after cleaning up the residual sleeve of the inner hole, polishing the inner hole smoothly by using an inner hole polisher, and cutting off a steel ingot cap mouth, so that the steel ingot cap mouth can be directly used for hot perforation production.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A hollow steel ingot casting mould comprises a cylindrical steel ingot mould (1), and is characterized in that: the steel ingot mould is characterized in that a lantern ring (2) is arranged in the center of the bottom of the inner side of the cylindrical steel ingot mould (1), molten steel injection holes (3) are symmetrically formed in the two sides of the bottom of the inner side of the cylindrical steel ingot mould (1), the lantern ring (2) is of a convex annular structure at the bottom of the cylindrical steel ingot mould (1), a center rod (4) is inserted into the lantern ring (2), the center rod (4) extends towards an opening at the upper end of the cylindrical steel ingot mould (1), a fixing frame is arranged on the outer side of the cylindrical steel ingot mould (1), one side of the fixing frame is connected with a pressing plate (6) through a bolt, and the lower end of the pressing plate (6) and the upper end of the center rod (4) are fixedly extruded through an adjusting bolt.
2. A hollow steel ingot casting mold according to claim 1, characterized in that the central rod (4) is composed of a plurality of sleeves (401), the sleeves (401) are of a hollow annular structure, the sleeves (401) are made of mullite, the outer layer of each sleeve is coated with a high-temperature-resistant coating, the outer diameter of each sleeve (401) is smaller than the inner diameter of the corresponding sleeve ring (2), one end of each sleeve (401) is provided with a convex ring (402), the other end of each sleeve is provided with a groove (403) matched with the convex ring (402), and the plurality of sleeves (401) are sequentially overlapped, overlapped and piled up to a required height through the convex rings (402) and the grooves (403) in a mutually matched mode.
3. A hollow ingot casting mold according to claim 2, wherein the hollow part inside the sleeve (401) is provided with a filling layer (5), and the filling layer (5) is quartz sand with a granularity of 1-3 mm.
4. A hollow ingot casting mold according to claim 1, characterized in that a height-adjustable cap is suspended at the upper end opening of the cylindrical ingot mold (1).
5. A hollow ingot casting mold according to claim 1, wherein the molten steel injection hole (3) has a circular truncated cone structure with a small top and a large bottom.
6. A hollow ingot casting mold according to claim 5, wherein the molten steel injection hole (3) has an upper mouth diameter of 122 ± 2mm and a lower mouth diameter of 145 ± 2mm.
7. A hollow ingot casting mold according to claim 1, characterized in that the collar (2) is in the shape of a ring bevel protrusion, and the longitudinal section of the collar (2) is a right triangle, and the inner diameter of the collar (2) is 20% -30% of the inner diameter of the bottom of the cylindrical ingot mold (1).
8. A hollow ingot casting mold according to claim 1, wherein the columnar ingot mold (1) has a shape having a smaller bottom and a larger top as a whole, and the ratio of the inner diameter of the upper opening to the inner diameter of the lower opening is 1.01 to 1.015.
9. A hollow ingot casting mould according to claim 1, characterized in that the cylindrical ingot mould (1) consists of the following elements in mass percent: c:3.0% -4.0%, si:1.0% -2.0%, mn:0.3 to 1.0 percent of the total weight of the alloy, less than or equal to 0.15 percent of P, less than or equal to 0.15 percent of S, and the balance of Fe and inevitable impurities.
10. A method of using the hollow ingot casting mold of claim 1, comprising the steps of:
(1) cleaning the inside of the mould, baking the whole casting system to 70-90 ℃, and laying a layer of covering slag at the bottom of the mould, wherein the adding amount of the covering slag is 0.1-0.2% of the weight of the cast steel ingot;
(2) after the refined molten steel is qualified in components and temperature, the refined molten steel is lifted to a casting station to start casting, the molten steel flows into an injection hole at the bottom of an ingot mold from a steel flowing system, the molten steel flows into the two injection holes simultaneously, the rising speed of the molten steel in the mold is controlled to be not higher than 0.2m/min, and after the ingot mold is filled with the molten steel, a heating agent and a heat preservation covering agent are added to a cap opening;
(3) and (3) demoulding after the cast steel ingot is shaped, polishing an inner hole smoothly by using an inner hole polisher, and cutting off a cap opening of the steel ingot to be directly used for subsequent production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210933486.9A CN115283626A (en) | 2022-08-04 | 2022-08-04 | Hollow steel ingot casting mold and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210933486.9A CN115283626A (en) | 2022-08-04 | 2022-08-04 | Hollow steel ingot casting mold and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115283626A true CN115283626A (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210933486.9A Pending CN115283626A (en) | 2022-08-04 | 2022-08-04 | Hollow steel ingot casting mold and using method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN115283626A (en) |
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2022
- 2022-08-04 CN CN202210933486.9A patent/CN115283626A/en active Pending
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