Die casting protection casting device and casting method

Abstract

The invention belongs to the technical field of casting, and particularly relates to a die casting protection casting device and a using method thereof. The die casting protection casting device is connected to a ladle nozzle in a sealed mode and comprises an upper sealing assembly, a lower sealing assembly and an adjusting device, and the upper sealing assembly and the lower sealing assembly are connected in a sealed and pressed mode. The adjusting device is connected to the steel ladle casting vehicle and connected with the upper sealing assembly. A ladle nozzle and a molten steel flowing area are wrapped, non-oxidation protection in the whole casting process is achieved, and the casting blank quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of casting technology, and specifically relates to a mold casting protective casting device and its usage method. Background Technology

[0002] In traditional ingot casting processes, molten steel exposed to air is prone to oxidation, resulting in increased oxygen and nitrogen content in the steel, which affects the quality of the ingot. Existing technologies have the following problems: Limited protection range: Conventional protective covers only cover the casting port and cannot shield the area through which molten steel flows, with an oxidation area of ​​≥15%; Uneven gas distribution: Single-point injection of inert gas easily creates turbulence, and local oxygen content fluctuations are greater than 100 ppm; Technical bottleneck: Lack of integrated solutions for modular, dynamically adjustable protection devices and high-efficiency gas injection systems.

[0003] Patent CN102794399A describes a casting process and specialized casting equipment that pre-introduces protective gas into the casting mold. It employs unilateral gas blowing, resulting in an oxygen content as low as 50 ppm, but the protection range only covers 30% of the casting port. Patent CN102029385A describes a protective casting device and process for special steel mold casting, which proposes a multi-stage gas distributor, but the blowing pressure range is narrow (0.1-0.3MPa), making it unsuitable for high-speed casting. Patent CN117206506A describes a protective casting device for special steel mold casting, which utilizes a water-cooled protective cover. However, the cooling system occupies a large space, increasing equipment maintenance costs by 35%. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a mold casting protective casting device that wraps around the ladle nozzle and the area through which molten steel flows, so as to achieve oxidation-free protection throughout the casting process and improve the quality of the cast billet.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A protective casting device for ingot casting, the protective casting device being sealed and connected to the ladle nozzle, includes an upper sealing assembly and a lower sealing assembly for sealing and pressing, and an adjusting device; the adjusting device is connected to the ladle casting car, and the adjusting device is connected to the upper sealing assembly; The upper sealing assembly includes: case; A casting lining is provided inside the housing, the top of which is used for sealing contact with the ladle nozzle; A movable sleeve is fitted over the outside of the casting lining. The movable sleeve includes a sleeve shell and a sealing top cover connected to the bottom of the sleeve shell. The inner wall of the sleeve shell is provided with a heat insulation layer. A telescopic cylinder is connected between the sealing cover and the housing, and is used to drive the housing and the movable sleeve to slide in a mutual sealing manner. The housing is provided with multiple inert gas inlets; the lower sealing assembly includes: Central injection tube casing; The injection tube bushing is fitted inside the outer shell of the central injection tube, and the center of the injection liner and the injection tube bushing are longitudinally connected to form an injection hole; The space between the outer shell of the central injection pipe and the bushing of the injection pipe is filled with quartz sand; The top of the central injection tube housing is connected to a sealing lower cover, and the upper surface of the sealing lower cover is provided with a sealing gasket for pressing with the sealing upper cover of the upper sealing assembly to form a seal.

[0006] The adjustment device includes a support fixedly connected to the ladle casting car, a lifting device connected to the support, a telescopic mechanism connected to the lifting device, and the movable end of the telescopic mechanism fixedly connected to the housing of the upper sealing component.

[0007] The telescopic cylinders are multiple and are evenly distributed circumferentially on the housing.

[0008] The telescopic cylinder and telescopic mechanism are either pneumatic cylinders or hydraulic cylinders. The injection tube bushing includes a top basin sleeve and multiple interconnected injection tube sleeves connected to the lower part of the basin sleeve.

[0009] The casting lining and the injection pipe bushing are made of refractory materials.

[0010] The shell, sleeve, and central injection tube outer shell are made of steel.

[0011] The sealing gasket is made of ceramic fiber.

[0012] The casting method using a molded casting protective casting device specifically includes: S1. Place the ladle on the ladle casting car and adjust the adjusting device to seal the upper sealing component with the ladle nozzle. S2. Ladle casting operation; simultaneously, inert gas is introduced into the inert gas inlet at an initial flow rate of 80-100 L / min and a pressure of 0.6-1 MPa; S3. Preheat the lower sealing assembly, and check the temperature of the central injection pipe shell to 1000-1200℃; S4. Move the ladle casting car above the lower sealing assembly, start full-flow pouring, and at the same time extend the telescopic cylinder to move the upper sealing cover down and press it against the lower sealing cover. S5. Molten steel flows into the mold through the injection hole; the blowing pressure P is adjusted in real time based on the molten steel flow rate Q. P=0.25Q+0.15(0.5≤Q≤5.0m³ / min); S6. After casting is completed, the steel flow is shut off, the telescopic cylinder retracts, and the upper and lower sealing covers separate.

[0013] Compared with existing technologies, the beneficial effects of this invention are: This invention achieves oxidation-free protection throughout the casting process, effectively reducing oxygen, nitrogen, and hydrogen enrichment in the ingot and improving the quality of the billet. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the upper sealing assembly and the lower sealing assembly.

[0016] Figure 3 This is a schematic diagram of the regulating device.

[0017] In the diagram: 1. Ladle nozzle; 2. Upper sealing assembly; 3. Lower sealing assembly; 4. Adjusting device; 5. Ladle casting car; 21. Shell; 22. Casting liner; 23. Outer shell; 24. Insulation layer; 25. Inert gas inlet; 26. Sealing top cover; 27. Telescopic cylinder; 31. Central injection pipe outer shell; 32. Injection pipe bushing; 33. Injection hole; 34. Quartz sand; 35. Sealing bottom cover; 36. Sealing gasket; 41. Support; 42. Lifting device; 43. Telescopic mechanism; 321. Basin sleeve; 322. Injection pipe sleeve. Detailed Implementation

[0018] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0019] A protective casting device for ingot casting, wherein the protective casting device is sealed and connected to the ladle nozzle 1, and includes an upper sealing assembly 2 and a lower sealing assembly 3 for sealing and pressing, and an adjusting device 4; the adjusting device 4 is connected to the ladle casting car 5, and the adjusting device 4 is connected to the upper sealing assembly 2. The upper sealing assembly 2 includes: Casing 21; A casting liner 22 is disposed inside the housing 21, and its top is used for sealing contact with the ladle nozzle 1; A movable sleeve is fitted over the outside of the casting liner 22. The movable sleeve includes a sleeve shell 23 and a sealing top cover 26 connected to the bottom of the sleeve shell 23. The inner wall of the sleeve shell 23 is provided with a heat insulation layer 24. Telescopic cylinder 27 is connected between the sealing cover 26 and the housing 21, and is used to drive the housing 21 and the sleeve of the movable sleeve to generate mutual sealing sliding; The housing 21 is provided with multiple inert gas inlets 25; the lower sealing assembly 3 includes: Central injection tube housing 31; The injection tube bushing 32 is fitted inside the central injection tube shell 31, and the center of the casting liner 22 and the injection tube bushing 32 are longitudinally connected to form an injection hole 33; The space between the central injection tube outer shell 31 and the injection tube bushing 32 is filled with quartz sand 34; The top of the central injection tube housing 31 is connected to a sealing lower cover 35, and a sealing gasket 36 is provided on the upper surface of the sealing lower cover 35 for pressing with the sealing upper cover 26 of the upper sealing assembly 2 to form a seal.

[0020] The adjustment device 4 includes a support 41 fixedly connected to the ladle casting car 5, a lifting device 42 connected to the support 41, a telescopic mechanism 43 connected to the lifting device 42, and the movable end of the telescopic mechanism 43 fixedly connected to the housing 21 of the upper sealing component 2.

[0021] There are multiple telescopic cylinders 27, which are evenly distributed circumferentially on the housing 21.

[0022] The telescopic cylinder 27 and the telescopic mechanism 43 are either pneumatic cylinders or hydraulic cylinders.

[0023] The injection tube bushing 32 includes a top basin sleeve 321 and a plurality of interconnected injection tube sleeves 322 connected to the lower part of the basin sleeve 321.

[0024] The casting lining 22 and the injection pipe bushing 32 are made of refractory materials.

[0025] The shell 21, sleeve 23 and central injection tube outer shell 31 are made of steel.

[0026] The sealing gasket 36 is made of ceramic fiber.

[0027] The casting method using a molded casting protective casting device specifically includes: S1. The ladle is placed on the ladle casting car 5, and the adjusting device 4 is adjusted to seal the upper sealing component 2 with the ladle nozzle 1. S2. Ladle casting operation; simultaneously, inert gas is introduced into inert gas inlet 25, with an initial flow rate of 80-100 L / min and a pressure of 0.6-1 MPa; S3. Preheat the lower sealing assembly 3, and check the temperature of the central injection tube housing 31 to 1000-1200℃; S4. Operate the ladle casting car 5 to the top of the lower sealing assembly 3, open the full flow casting, and at the same time extend the telescopic cylinder 27 to make the upper sealing cover 26 move down and seal and press against the lower sealing cover 35. S5. Molten steel flows into the mold through injection hole 33; the injection pressure P is adjusted in real time based on the molten steel flow rate Q. P=0.25Q+0.15(0.5≤Q≤5.0m³ / min); S6. Casting is completed, the steel flow is shut off, the telescopic cylinder 27 retracts, and the upper sealing cover 26 separates from the lower sealing cover 35.

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example A protective casting device for ingot casting, wherein the protective casting device is sealed and connected to the ladle nozzle 1, and includes an upper sealing assembly 2 and a lower sealing assembly 3 for sealing and pressing, and an adjusting device 4; the adjusting device 4 is connected to the ladle casting car 5, and the adjusting device 4 is connected to the upper sealing assembly 2. The upper sealing assembly 2 includes: a housing 21; A casting liner 22 is disposed inside the housing 21, and its top is used for sealing contact with the ladle nozzle 1; A movable sleeve is fitted over the outside of the casting liner 22. The movable sleeve includes a sleeve shell 23 and a sealing top cover 26 connected to the bottom of the sleeve shell 23. The inner wall of the sleeve shell 23 is provided with a heat insulation layer 24. Telescopic cylinder 27 is connected between the sealing cover 26 and the housing 21, and is used to drive the housing 21 and the sleeve of the movable sleeve to generate mutual sealing sliding; The housing 21 is provided with 10 inert gas inlets 25; the lower sealing assembly 3 includes: a central injection pipe housing 31; The injection tube bushing 32 is fitted inside the central injection tube shell 31, and the center of the casting liner 22 and the injection tube bushing 32 are longitudinally connected to form an injection hole 33; Quartz sand 34 is filled between the central injection pipe outer shell 31 and the injection pipe bushing 32; A sealing lower cover 35 is connected to the top of the central injection tube housing 31. A sealing gasket 36 made of ceramic fiber is provided on the upper surface of the sealing lower cover 35. It is used to press against the sealing upper cover 26 of the upper sealing assembly 2 to form a seal.

[0030] The adjusting device 4 includes a support 41 fixedly connected to the ladle casting car 5, a lifting device 42 connected to the support 41, a telescopic mechanism 43 connected to the lifting device 42, and the movable end of the telescopic mechanism 43 fixedly connected to the housing 21 of the upper sealing assembly 2.

[0031] There are two telescopic cylinders 27, which are evenly distributed circumferentially on the housing 21. The telescopic cylinders 27 and the telescopic mechanism 43 are cylinders.

[0032] The injection tube bushing 32 includes a top basin sleeve 321 and an interconnected injection tube sleeve 322 connected to the lower part of the basin sleeve 321.

[0033] The casting lining 22 and the injection pipe lining 32 are made of refractory materials.

[0034] The shell 21, sleeve 23 and central injection tube outer shell 31 are made of steel.

[0035] The casting method using a molded casting protective casting device specifically includes: S1. A 100-ton steel ladle is placed on the casting car 5. After the casting preparation is completed, the operating adjustment device 4 is used to seal the upper sealing component 2 with the ladle nozzle 1.

[0036] S2. Ladle casting operation, argon gas is introduced into argon inlet 25 at an initial flow rate of 80-100 L / min and a pressure of 0.6-0.7 MPa.

[0037] S3. Preheat the lower sealing assembly, and check the temperature of the central injection tube shell to 1050℃; S4. Reduced flow operation: The ladle casting car 5 moves directly above the lower sealing assembly 3 and starts full-flow pouring. At the same time, the telescopic cylinder 27 extends, causing the upper sealing cover 26 to move down and press against the lower sealing cover 35.

[0038] S5. Molten steel flows into the ingot mold through injection hole 33. Adjust the argon flow rate to 50-80L / min and the pressure to 0.2MPa to maintain a slight positive pressure inside the sealed cavity.

[0039] S6. After pouring is completed, the steel flow is shut off, the telescopic cylinder 27 retracts, and the upper sealing cover 26 separates from the lower sealing cover 35.

[0040] S7. Check the condition of the ladle nozzle and the lower space. If there is no solidified steel connection with the lower part, operate the ladle casting car 5 to move away from the sealing assembly 3.

[0041] S8. Operate the adjusting device 4 to disengage the upper sealing assembly 2 from the ladle nozzle 1. The ladle is then lifted away from the ladle casting car 5.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold casting protective casting device, characterized in that, The protective casting device is sealed and connected to the ladle nozzle, including an upper sealing assembly and a lower sealing assembly with sealing and pressing, and an adjusting device; the adjusting device is connected to the ladle casting car, and the adjusting device is connected to the upper sealing assembly. The upper sealing assembly includes: case; A casting lining is provided inside the housing, the top of which is used for sealing contact with the ladle nozzle; A movable sleeve is fitted over the outside of the casting lining. The movable sleeve includes a sleeve shell and a sealing top cover connected to the bottom of the sleeve shell. The inner wall of the sleeve shell is provided with a heat insulation layer. A telescopic cylinder is connected between the sealing cover and the housing, and is used to drive the housing and the movable sleeve to slide in a mutual sealing manner. The housing is provided with multiple inert gas inlets; the lower sealing assembly includes: Central injection tube casing; The injection tube bushing is fitted inside the outer shell of the central injection tube, and the center of the injection liner and the injection tube bushing are longitudinally connected to form an injection hole; The space between the outer shell of the central injection pipe and the bushing of the injection pipe is filled with quartz sand; The top of the central injection tube housing is connected to a sealing lower cover, and the upper surface of the sealing lower cover is provided with a sealing gasket for pressing with the sealing upper cover of the upper sealing assembly to form a seal. The adjustment device includes a support fixedly connected to the ladle casting car, a lifting device connected to the support, a telescopic mechanism connected to the lifting device, and the movable end of the telescopic mechanism fixedly connected to the housing of the upper sealing component.

2. The mold casting protective casting device according to claim 1, characterized in that, The telescopic cylinders are multiple and are evenly distributed circumferentially on the housing.

3. The mold casting protective casting device according to claim 1, characterized in that, The telescopic cylinder and telescopic mechanism are either pneumatic cylinders or hydraulic cylinders. The injection tube bushing includes a top basin sleeve and multiple interconnected injection tube sleeves connected to the lower part of the basin sleeve.

4. The mold casting protective casting device according to claim 1, characterized in that, The casting lining and the injection pipe bushing are made of refractory materials.

5. The mold casting protective casting device according to claim 1, characterized in that, The shell, sleeve, and central injection tube outer shell are made of steel.

6. The mold casting protective casting device according to claim 1, characterized in that, The sealing gasket is made of ceramic fiber.

7. The casting method using the mold casting protective casting device as described in claim 1, characterized in that, Specifically, it includes: S1. Place the ladle on the ladle casting car and adjust the adjusting device to seal the upper sealing component with the ladle nozzle. S2. Ladle casting operation; simultaneously, inert gas is introduced into the inert gas inlet at an initial flow rate of 80-100 L / min and a pressure of 0.6-1 MPa; S3. Preheat the lower sealing assembly, and check the temperature of the central injection pipe shell to 1000-1200℃; S4. Move the ladle casting car above the lower sealing assembly, start full-flow pouring, and at the same time extend the telescopic cylinder to move the upper sealing cover down and press it against the lower sealing cover. S5. Molten steel flows into the mold through the injection hole; Based on the molten steel flow rate Q, the injection pressure P is adjusted in real time. P=0.25Q+0.15, 0.5≤Q≤5.0m³ / min; S6. After casting is completed, the steel flow is shut off, the telescopic cylinder retracts, and the upper and lower sealing covers separate.

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