Novel die casting protection casting device and casting process

Abstract

The invention discloses a novel die casting protection casting device and a casting process, and relates to the technical field of casting. The novel die casting protective casting device comprises an upper-layer protective steel cover and a lower-layer protective steel cover, the upper-layer protective steel cover is a cylindrical steel cover body with the taper of 18-22 degrees, the height of the upper-layer protective steel cover is 145-155 mm, the top diameter of the upper-layer protective steel cover is 195-205 mm, an argon distribution channel is arranged in the cover body, and an air inlet pipe is arranged in the channel; a plurality of vertically downward gas escape holes are formed in the channel; the inner layer and the outer layer of the lower middle portion of the cover body are both wrapped by refractory materials, the lower-layer protection steel cover is composed of two semi-cylindrical cover bodies with the same taper as the upper-layer protection steel cover, the height of the lower-layer protection steel cover is 145-155 mm, the bottom diameter of the lower-layer protection steel cover is 395-405 mm, the inner layer and the outer layer of the cover body are both wrapped by refractory materials, and the argon distribution channel is an annular channel arranged on the upper portion of the cover body. The refractory material is a high-temperature refractory asbestos felt, the protective cover body of the protective casting device is made of a steel material, and meanwhile, the high-temperature-resistant asbestos felt is wrapped on the inner layer and the outer layer, so that the protective steel cover is not easy to deform.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a novel die casting protection casting device and a casting process. Background Art

[0002] During the casting process of die-cast molten steel, the high-temperature liquid molten steel comes out from the ladle water outlet to the pouring gate. The molten steel casting flow of 200mm-250mm distance is easily exposed to the air, and the nitrogen content in the air accounts for 78%, which will cause some nitrogen to dissolve in the high-temperature molten steel, causing the molten steel to increase nitrogen. The nitrogen content of some steel grades even exceeds the standard requirements. The traditional die casting part is not protected, and some have protective devices, which are only a simple shell cover, and the protective casting effect is poor. Taking 12Cr2Mo1VR steel as an example, with the issuance of the new implementation standard GB / T 713-2023, it requires the finished product nitrogen content ≤0.0070%. For steel plates with a rolling thickness of ≥120mm, die casting is required. However, the die casting protection casting effect is relatively poor, and the nitrogen increase during the casting process is generally above 10ppm, and some even exceed 20ppm. In addition, 12Cr2Mo1VR steel contains higher Cr, V and lower P. The nitrogen in the molten steel after vacuum is higher, and V further aggravates the nitrogen fixation effect, so the nitrogen content of the finished product is easy to exceed the standard requirements. How to reduce nitrogen addition in the die casting process and improve the protective casting effect has become an urgent problem to be solved by many steel mills. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a novel mold casting protection casting device and casting process that can solve the above-mentioned problem.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a novel mold casting protective casting device, including upper and lower protective steel covers, the upper protective steel cover is a cylindrical steel cover body with a taper of 18 to 22 degrees, a height of 145 to 155 mm, a top diameter of 195 to 205 mm, an argon distribution channel is provided in the cover body, and an air inlet pipe is installed in the channel; a plurality of vertical downward gas escape holes are opened on the channel; the inner and outer layers of the middle and lower parts of the cover body are both wrapped with refractory materials. The lower protective steel cover is two semi-cylindrical cover bodies with the same taper as the upper protective steel cover, a height of 145 to 155 mm, a bottom diameter of 395 to 405 mm, and the inner and outer layers of the cover body are both wrapped with refractory materials.

[0005] Preferably, the argon distribution channel is an annular channel arranged on the upper part of the cover body, and the refractory material is high-temperature refractory asbestos felt.

[0006] Preferably, the protective casting device adopts steel material to make the protective cover body, and the inner and outer layers are wrapped with high-temperature resistant asbestos felt, so that the protective steel cover is not easy to deform.

[0007] Preferably, the upper and lower layers of protective steel covers are overlapped with each other by 50 to 100 mm.

[0008] Preferably, a novel die casting protection casting process comprises the following specific steps: S1: hoisting the ladle to the die casting casting vehicle platform, and adjusting until the center of the ladle water inlet is aligned with the center of the center injection pipe;

[0009] S2: Place a layer of high temperature refractory asbestos felt on the upper edge of the middle injection pipe;

[0010] S3: After the argon gas test is normal, place a bowl-shaped zirconium fiber sealing ring on the upper tapered cylindrical protective steel cover, then place the protective steel cover under the ladle nozzle close to the bottom of the ladle, start the casting car to the pouring position to start pouring, and after the drainage sand has flowed out and the casting stream is rounded, close the slide plate and start the casting car until the center of the ladle nozzle is aligned with the center of the center injection pipe;

[0011] S4: Open the argon valve and adjust the argon pressure to 0.1-0.3 MPa;

[0012] S5: Casting, after adjusting the steel flow size to a suitable level, two tapered semi-cylindrical lower protective steel covers are placed on the refractory asbestos felt of the extended section of the middle pouring pipe from both sides of the casting car, the upper edge of the lower protective steel cover is close to the lower edge of the upper protective steel cover, and one end of the two semi-cylindrical protective steel cover bodies is ensured to be close to each other, and the other end can be filled with high-temperature resistant asbestos felt if there is a gap, and the argon pressure in the protective cover is kept greater than the external gas pressure to achieve full protection casting of the steel flow; the present invention isolates the air by implementing full argon protection on the casting flow exposed to the air, reduces the contact between molten steel and air, and the nitrogen increase during the casting process is ≤8pp. .

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) This new type of mold casting protection casting device and casting process improves the quality of molten steel and isolates the air: through full argon protection, the air is effectively isolated, the contact between molten steel and air is reduced, the degree of oxidation of molten steel is reduced, and the purity of molten steel is maintained to the greatest extent, providing a guarantee for the production of high-quality steel products; at the same time, nitrogen increase is reduced: the nitrogen increase during the casting process is ≤8ppm, and the nitrogen content in the molten steel is strictly controlled. The lower nitrogen content helps to improve the toughness, ductility and other mechanical properties of steel, making the steel products more high-quality and reliable.

[0015] (2) The new type of mold-cast protective casting device and casting process realizes the following aspects for the equipment: Refractory material protection of the equipment: placing high-temperature refractory asbestos felt on the upper edge of the center pouring pipe and using a protective steel cover can effectively protect the center pouring pipe and other equipment from erosion and damage by high-temperature molten steel, extend the service life of the equipment, reduce production costs, and stabilize the casting process; precise alignment: aligning the center of the ladle water inlet with the center of the center pouring pipe and making accurate adjustments during the casting process to ensure the accuracy and stability of the casting, which is conducive to achieving continuous and uniform casting, improving production efficiency and consistency of product quality; and steel flow control: adjusting the steel flow size to an appropriate level and making the casting process more controllable through the design of a protective steel cover, reducing the risk of steel flow fluctuation and splashing, and improving production safety.

[0016] (3) The new type of mold casting protection casting device and casting process has high reliability and argon protection system: casting is carried out after the argon gas is tested to be normal, and the argon gas pressure is strictly controlled at 0.1-0.3MPa, which ensures the stability and reliability of argon protection. At the same time, the design and installation method of the protective cover ensure that the argon gas can fully cover the steel flow to achieve effective protection. At the same time, it is easy to operate: the whole process steps are clear, the operation is relatively simple, and it is easy for workers to master and execute, which is conducive to improving production efficiency and process stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 It is a structural schematic diagram of the present invention; DETAILED DESCRIPTION

[0019] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0023] See also Figure 1 The present invention provides a technical solution: a novel mold casting protection pouring device, including upper and lower protective steel covers, the upper protective steel cover is a cylindrical steel cover body with a taper of 18-22°, a height of 145-155mm, a top diameter of 195-205mm, an argon distribution channel is provided in the cover body, an air inlet pipe is installed in the channel; a plurality of vertical downward gas escape holes are opened on the channel; the inner and outer layers of the middle and lower parts of the cover body are wrapped with refractory materials. The lower protective steel cover is two semi-cylindrical cover bodies with the same taper as the upper protective steel cover, a height of 145-155mm, a bottom diameter of 395-405mm, and the inner and outer layers of the cover body are wrapped with refractory materials.

[0024] The argon distribution channel is an annular channel arranged on the upper part of the cover body, and the refractory material is high-temperature refractory asbestos felt.

[0025] The protective casting device is made of steel material to form a protective cover, and the inner and outer layers are wrapped with high-temperature resistant asbestos felt. The protective steel cover is not easy to deform and can be reused many times; the high-temperature resistant and poorly permeable refractory asbestos felt is used as the refractory material, and the upper and lower layers of the protective steel cover are 50-100mm apart to ensure that the casting strand can be sealed and protected when the distance between the bottom of the ladle water outlet and the center injection pipe is inconsistent, and the protection effect is good. The valve is controlled by a gas pressure gauge. After the argon enters the protective cover, it is evenly distributed around the casting strand through the distribution channel, and a slight positive pressure is generated in the cover, which is conducive to preventing the entry of external air.

[0026] This solution isolates the air by implementing full argon protection on the casting strand exposed to the air, reducing the contact between molten steel and air, thereby achieving the purpose of reducing nitrogen increase in the casting process, with the nitrogen increase ≤8ppm.

[0027] Example 1

[0028] See also Figure 1The protective casting device includes two layers of protective steel covers, the upper protective steel cover is a cylindrical steel cover body with a taper of 20°, a height of 151mm, a top diameter of 200mm, an argon distribution channel is arranged in the cover body, and an air inlet pipe is installed in the channel; a number of gas escape holes are opened vertically downward on the channel; the inner and outer layers of the middle and lower part of the cover body are wrapped with refractory materials, the lower protective steel cover is two semi-cylindrical covers with the same taper as the upper protective steel cover, a height of 150mm, a bottom diameter of 403mm, the inner and outer layers of the cover body are wrapped with refractory materials, the bottom of the water inlet is 232mm away from the extended section platform of the center injection pipe, the argon distribution channel is an annular channel arranged on the upper part of the cover body, the refractory material is high-temperature refractory asbestos felt, the casting steel grade is 12Cr2Mo1VR, the head and tail sampling of the rolled material are compared with the ladle sampling, and the process nitrogen increase is 6ppm and 5ppm respectively.

[0029] Example 2

[0030] See also Figure 1 The protective casting device includes two layers of protective steel covers, the upper protective steel cover is a cylindrical steel cover body with a taper of 20°, a height of 150mm, a top diameter of 201mm, an argon distribution channel is arranged in the cover body, and an air inlet pipe is installed in the channel; a number of gas escape holes are opened vertically downward on the channel; the inner and outer layers of the middle and lower part of the cover body are wrapped with refractory materials, the lower protective steel cover is two semi-cylindrical covers with the same taper as the upper protective steel cover, with a height of 148mm and a bottom diameter of 404mm. The inner and outer layers of the cover body are wrapped with refractory materials, the bottom of the water inlet is 220mm away from the extension platform of the center injection pipe, the argon distribution channel is an annular channel arranged on the upper part of the cover body, the refractory material is high-temperature refractory asbestos felt, the casting steel grade is 12Cr2Mo1VR, the head and tail sampling of the rolled material are compared with the ladle sampling, and the nitrogen increase during the process is 4ppm and 3ppm respectively.

[0031] Furthermore, a novel die casting protection casting process includes the following specific steps: S1: hoisting the ladle to the die casting casting vehicle platform, and adjusting until the center of the ladle water inlet is aligned with the center of the center pouring pipe;

[0032] S2: Place a layer of high temperature refractory asbestos felt on the upper edge of the middle injection pipe;

[0033] S3: After the argon gas test is normal, place a bowl-shaped zirconium fiber sealing ring on the upper tapered cylindrical protective steel cover, then place the protective steel cover under the ladle nozzle close to the bottom of the ladle, start the casting car to the pouring position to start pouring, and after the drainage sand has flowed out and the casting stream is rounded, close the slide plate and start the casting car until the center of the ladle nozzle is aligned with the center of the center injection pipe;

[0034] S4: Open the argon valve and adjust the argon pressure to 0.1-0.3 MPa;

[0035] S5: Casting, after adjusting the size of the steel flow to an appropriate level, two tapered semi-cylindrical lower protective steel covers are placed on the refractory asbestos felt of the extended section of the middle pouring pipe from both sides of the casting car, with the upper edge of the lower protective steel cover close to the lower edge of the upper protective steel cover, and one end of the two semi-cylindrical protective steel cover bodies is ensured to be close to each other, and the other end can be stuffed with high-temperature resistant asbestos felt if there is a gap, so as to keep the argon pressure in the protective cover greater than the external gas pressure, so as to achieve full protection casting of the steel flow; the present invention isolates the air by implementing full argon protection on the casting flow exposed to the air, thereby reducing the contact between molten steel and air, and the nitrogen increase during the casting process is ≤8ppm.

[0036] Furthermore, the process improves the quality of molten steel and isolates air: through full argon protection, air is effectively isolated, the contact between molten steel and air is reduced, the degree of oxidation of molten steel is reduced, the purity of molten steel is maintained to the greatest extent, and high-quality steel products are guaranteed; at the same time, nitrogen addition is reduced: the nitrogen addition during the casting process is ≤8ppm, and the nitrogen content in molten steel is strictly controlled. The lower nitrogen content helps to improve the toughness, ductility and other mechanical properties of steel, making steel products more high-quality and reliable;

[0037] Furthermore, the process achieves the following for the equipment: Refractory protection of the equipment: Placing high-temperature refractory asbestos felt on the upper edge of the center pouring pipe and using protective steel covers can effectively protect the center pouring pipe and other equipment from erosion and damage by high-temperature molten steel, extend the service life of the equipment, reduce production costs, and stabilize the casting process; Precise alignment: Align the center of the ladle nozzle with the center of the center pouring pipe, and make accurate adjustments during the casting process to ensure the accuracy and stability of the casting, which is conducive to achieving continuous and uniform casting, improving production efficiency and consistency of product quality; Steel flow control: Adjust the steel flow size to an appropriate level, and through the design of the protective steel cover, make the casting process more controllable, reduce the risk of steel flow fluctuations and splashing, and improve production safety;

[0038] Furthermore, the process has high reliability and argon protection system: casting is carried out after the argon gas is tested to be normal, and the argon gas pressure is strictly controlled at 0.1-0.3MPa, which ensures the stability and reliability of argon protection. At the same time, the design and installation method of the protective cover ensure that the argon gas can fully cover the steel flow to achieve effective protection. At the same time, it is easy to operate: the whole process steps are clear, the operation is relatively simple, and it is easy for workers to master and execute, which is conducive to improving production efficiency and process stability.

[0039] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A new type of mold casting protection casting device, characterized in that: It includes two layers of protective steel covers, the upper protective steel cover is a cylindrical steel cover with a taper of 18-22°, a height of 145-155mm, a top diameter of 195-205mm, an argon distribution channel is provided in the cover, and an air inlet pipe is installed in the channel; a number of vertical downward gas escape holes are opened on the channel; the inner and outer layers of the middle and lower parts of the cover are wrapped with refractory materials. The lower protective steel cover is two semi-cylindrical covers with the same taper as the upper protective steel cover, with a height of 145-155mm, a bottom diameter of 395-405mm, and the inner and outer layers of the cover are wrapped with refractory materials.

2. A novel mold casting protection pouring device according to claim 1, characterized in that: The argon distribution channel is an annular channel arranged on the upper part of the cover body, and the refractory material is high-temperature refractory asbestos felt.

3. A novel mold casting protection pouring device according to claim 1, characterized in that: The protective casting device adopts steel material to make the protective cover body, and the inner and outer layers are wrapped with high-temperature resistant asbestos felt, so the protective steel cover is not easy to deform.

4. A novel mold casting protection pouring device according to claim 1, characterized in that: The upper and lower protective steel covers are placed 50 to 100 mm apart.

5. A new type of die casting protection casting process, characterized in that: The following specific steps are included: S1: hoisting the ladle to the die casting car platform, and adjusting until the center of the ladle nozzle is aligned with the center of the center pouring pipe; S2: Place a layer of high temperature refractory asbestos felt on the upper edge of the middle injection pipe; S3: After the argon gas test is normal, place a bowl-shaped zirconium fiber sealing ring on the upper tapered cylindrical protective steel cover, then place the protective steel cover under the ladle nozzle close to the bottom of the ladle, start the casting car to the pouring position to start pouring, and after the drainage sand has flowed out and the casting stream is rounded, close the slide plate and start the casting car until the center of the ladle nozzle is aligned with the center of the center injection pipe; S4: Open the argon valve and adjust the argon pressure to 0.1-0.3 MPa; S5: Casting, after adjusting the size of the steel flow to an appropriate level, two tapered semi-cylindrical lower protective steel covers are installed on the refractory asbestos felt of the extended section of the middle pouring pipe from both sides of the casting car, with the upper edge of the lower protective steel cover close to the lower edge of the upper protective steel cover, and one end of the two semi-cylindrical protective steel cover bodies is ensured to be close to each other, and the other end can be stuffed with high-temperature resistant asbestos felt if there is a gap, so as to keep the argon pressure in the protective cover greater than the external gas pressure, so as to achieve full protection casting of the steel flow; the present invention isolates the air by implementing full argon protection on the casting flow exposed to the air, thereby reducing the contact between molten steel and air, and the nitrogen increase during the casting process is ≤8pp.

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