Casting assembly

Abstract

The utility model discloses a casting component, which relates to the field of industrial smelting and comprises an exhaust device and a reduction cover. High-temperature molten steel needs to be cooled and formed after being poured, however, when the molten steel is exposed in the air in the cooling process, the molten steel reacts with oxygen in the air to form oxides, surface black spots are caused, and the casting quality is affected. By arranging the reduction cover and the exhaust device, the casting is placed in the first cavity in the reduction cover, the exhaust device is connected with the first gas inlet through the first pipeline, protective gas is fed into the first cavity through the first pipeline and the first gas inlet, and therefore original air in the first cavity is exhausted out of the first cavity through the first gas overflow opening. And the casting is in full contact with the protective gas in the cooling process, so that the situation that oxygen reacts with the casting is reduced. Meanwhile, the situation of air convection is simulated, the temperature rise caused by heat radiation of the casting in the first cavity is reduced, the problem of shrinkage cavities caused by poor heat radiation of the casting is reduced, and the quality of the casting is improved.

Description

Technical Field

[0001] The utility model relates to the field of investment casting, in particular to a casting component. Background Art

[0002] Metal melting and pouring is an important part of the investment casting process. However, the surface quality control of alloy steels such as 200 series and 400 series with low oxidation resistance is often not very ideal, because the pouring temperature of such alloys is high, between 1560-1600 degrees Celsius. During the high-temperature melting process and the cooling process after pouring, the high-temperature molten steel easily reacts with the oxygen in the air, causing the surface oxidation of the poured castings. After cleaning, the castings are often prone to defects, such as pitting and black spots. Both of these are usually caused by the easy oxidation of high-temperature molten steel, unclean recycled materials, and incomplete melting, deoxidation and slag removal. However, it is often difficult to control in actual production. When pitting appears in the casting, it is usually a piece of small concave spots filled with oxides, which has an adverse effect on the appearance of the product. Black spots are also oxidized inclusions, but sometimes it is difficult to see them in the blank. Usually, they are revealed after processing. For products with high mechanical transmission performance requirements, if they are discovered after processing, they usually cause great losses. The existence of these two defects makes the castings fail to meet the quality requirements, resulting in repeated welding repairs or even scrapping, wasting a lot of human resources and delaying product delivery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a casting component that can protect the stainless steel melting process and the pouring and cooling process to reduce the reaction between the high-temperature molten steel and oxygen in the air during the pouring and cooling process, thereby reducing the possibility of oxidation inclusions in the high-temperature molten steel, simulating air convection, reducing shrinkage holes, and thus improving the surface quality of the casting.

[0004] According to the casting assembly of the embodiment of the utility model, it includes: a reduction hood, which has a first cavity for placing the casting formed inside, and the reduction hood is provided with a first air inlet and a first air overflow port, and the first air inlet and the first air overflow port are both connected to the first cavity; an exhaust device, which is connected to the first air inlet through a first pipe, and the exhaust device is used to transport protective gas into the first cavity.

[0005] The casting assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0006] After high-temperature molten steel is poured, it needs to be cooled and formed. However, when the molten steel is exposed to the air during the cooling process, it will react with the oxygen in the air to form oxides, causing black spots on the surface and affecting the quality of the casting. By setting a reduction hood and an exhaust device, the casting is placed in the first cavity in the reduction hood. The exhaust device is connected to the first air inlet through a first pipe, and the protective gas is sent into the first cavity through the first pipe and the first air inlet, so that the original air in the first cavity is discharged from the first cavity through the first overflow port. The casting is fully exposed to the protective gas during the cooling process, reducing the oxygen content in the first cavity, thereby reducing the reaction between oxygen and the casting. At the same time, the air convection is simulated to reduce the temperature rise caused by the thermal radiation of the casting in the first cavity, reduce the shrinkage problem caused by poor heat dissipation of the casting, and improve the quality of the casting.

[0007] According to some embodiments of the utility model, the casting assembly also includes a furnace and a protective cover, the protective cover abuts against the upper end of the furnace, a second cavity is formed between the protective cover and the furnace, the protective cover is provided with a second air inlet and a second air overflow port at intervals, the second air inlet and the second air overflow port are both connected to the second cavity, and the exhaust device is connected to the second air inlet through a second pipe.

[0008] According to some embodiments of the present invention, an induction coil is provided on the outer peripheral wall of the furnace, and the induction coil is used to heat the furnace.

[0009] According to some embodiments of the utility model, a plurality of the induction coils are provided, and the plurality of the induction coils are arranged around the outer peripheral wall of the melting furnace at intervals in the up-down direction.

[0010] According to some embodiments of the present invention, it is characterized in that a diverter valve is provided in the first pipeline, and the diverter valve is located at the connection between the first pipeline and the first air inlet.

[0011] According to some embodiments of the present invention, the casting component further includes an oxygen content detector, which is connected to the exhaust device and is used to detect the oxygen content of the protective gas in the exhaust device.

[0012] According to some embodiments of the present invention, the casting assembly further includes a dehumidifier, which is connected to the exhaust device and is used to absorb moisture in the protective gas.

[0013] According to some embodiments of the present invention, the casting assembly further includes a pressure reducing device, which is connected to the exhaust device and is used to reduce the gas pressure in the first cavity.

[0014] According to some embodiments of the utility model, the casting assembly further comprises a driving device, which is used to drive the reduction cover to move in a direction close to the casting to cover the casting, or to drive the reduction cover to move in a direction away from the casting.

[0015] According to some embodiments of the utility model, the casting assembly further includes a platform, the platform is used to place the casting, the platform is provided with a gravity sensor, and the gravity sensor is connected to the driving device.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 It is a structural schematic diagram of a casting component of an embodiment of the utility model.

[0019] Reference numerals:

[0020] Casting assembly 1000; reduction cover 100; first air inlet 110; first overflow port 120; first cavity 130; platform 200; exhaust device 300; first pipeline 310; second pipeline 320; furnace 400; induction coil 410; protective cover 500; second overflow port 510; second air inlet 520; second cavity 530; oxygen detector 600; dehumidifier 700; pressure reducing device 800. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, 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 cannot be understood as a limitation on the present invention.

[0023] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] 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.

[0025] Reference Figure 1 As shown, a casting assembly 1000 according to an embodiment of the present invention can be used for smelting metals, including iron and other metals, especially for smelting and reducing steel. For ease of understanding, the following content is described by taking steel as an example of a casting.

[0026] The casting assembly 1000 of the embodiment of the utility model comprises: a reduction cover 100 and an exhaust device 300, wherein the reduction cover 100 is formed with a first cavity 130, and the first cavity 130 is used to place the casting. The reduction cover 100 is provided with a first air inlet 110 and a first air overflow 120 at intervals, and the first air inlet 110 and the first air overflow 120 are respectively connected to the first cavity 130. The exhaust device 300 is connected to the first air inlet 110 through a first pipe 310, and the protective gas is transported into the first cavity 130 through the first pipe 310 and the first air inlet 110 to discharge the original air. The protective gas can be carbon dioxide, nitrogen and argon. The high-temperature molten steel in the first cavity 130 contacts the protective gas for cooling and reduction, reducing the contact with oxygen, and also reducing the oxidation reaction of the cast casting during the reduction process. The surface of the casting reduced in the protective gas has no black spots or pitting, thereby improving the surface quality of the casting.

[0027] During the solidification process of liquid steel, the temperature of the molten steel is higher than the surrounding environment, so it releases heat to the outside in the form of thermal radiation. In order to reduce thermal radiation, the reduction cover 100 is provided with a first air inlet 110 and a first overflow port 120. After the gas enters from the first air inlet 110, it is discharged from the first overflow port 120, so that the gas flows in the first cavity 130 and takes away excess heat, thereby reducing the adverse effects of thermal radiation on the surface of the casting.

[0028] refer to Figure 1As shown, in some embodiments of the utility model, the casting assembly 1000 further includes a furnace 400 and a protective cover 500. The furnace 400 is used to melt steel, and the heating method can be flame heating, resistance heating and induction heating. The protective cover 500 is provided with a second air inlet 520 and a second overflow port 510. The exhaust device 300 is connected to the second air inlet 520 through a second pipe 320. The protective cover 500 abuts against the upper end of the furnace 400. A second cavity 530 is formed between the protective cover 500 and the furnace 400. The exhaust device 300 delivers the protective gas into the second cavity 530 through the second pipe 320 and the second air inlet 520. This allows the high-temperature melting process of the steel to be completed in the atmosphere of the protective gas, reducing the reaction with oxygen, improving the quality of the molten steel, and at the same time, there is no need to perform the operation of deoxidizing the molten steel, thereby improving the processing efficiency.

[0029] refer to Figure 1 As shown, in some embodiments of the present invention, the outer peripheral wall of the melting furnace 400 is provided with an induction coil 410, which can heat efficiently and reduce energy loss. At the same time, the induction coil 410 has a fast heating speed and can guide the high-frequency electromagnetic field into the heated material in a short time to quickly heat it. The induction coil 410 is arranged on the outer peripheral wall of the melting furnace 400 and does not need to be in physical contact with the molten steel, thereby reducing material pollution and loss.

[0030] refer to Figure 1 As shown, in some embodiments of the present invention, the induction coil 410 is disposed around the outer peripheral wall of the furnace 400 in the vertical direction. The steel can be heated evenly, ensuring that the temperature distribution inside the entire furnace 400 is uniform and reducing the temperature gradient. It can also respond quickly and provide heat at various locations to improve processing efficiency.

[0031] refer to Figure 1 As shown, in some embodiments of the utility model, a diverter valve is provided at the connection between the first pipeline 310 and the first air inlet 110, and the diverter valve can be used to adjust the flow of the fluid. By adjusting the position of the valve core, the flow rate through each diverter channel can be changed. The diverter valve can achieve balanced and smooth flow regulation, so that the protective gas flowing into the first cavity 130 is evenly distributed and fills the first cavity 130, thereby improving the surface quality of the casting.

[0032] refer to Figure 1 As shown, in some embodiments of the present invention, the exhaust device 300 is connected to an oxygen detector 600. The oxygen detector 600 can detect the oxygen content in the exhaust device 300, which facilitates the operator to monitor the protective gas in the exhaust device 300 and prevents the gas with an oxygen content higher than a certain value from entering the first cavity 130 to reduce the surface quality of the casting.

[0033] refer to Figure 1As shown, in some embodiments of the present invention, one of the functions of the protective gas is to remove oxygen in the first cavity 130, but if the gas also contains moisture, water vapor can also trigger an oxidation reaction. Therefore, in order to ensure that the gas is dry, the casting assembly 1000 is provided with a dehumidifier 700, and the dehumidifier 700 is connected to the exhaust device 300, which is used to remove moisture from the protective gas and improve the surface quality of the casting.

[0034] refer to Figure 1 As shown, in some embodiments of the present invention, the casting assembly 1000 also includes a pressure reducing device 800, which is used to reduce the air pressure in the first cavity 130. By controlling the air pressure of the surrounding gas, the solidification rate and grain size of the molten steel can be adjusted, the strength and plasticity of the steel can be improved, and the quality of the casting can be improved.

[0035] In some embodiments of the utility model, the reduction cover 100 is connected to a driving device, and the driving device can drive the reduction cover 100 away from or close to the casting. For example, when the driving device drives the reduction cover to move in the up and down directions, when the casting is placed under the reduction cover, the driving device drives the reduction cover to fall, covering the casting, so that the casting can be cooled in an atmosphere full of protective gas. After cooling and molding, the driving device drives the reduction cover to rise to facilitate the removal of the casting and the placement of a new steel liquid mold string. The driving device can provide a larger force to drive heavier objects, and the driving device is provided to connect the reduction cover 100 to improve the versatility of the casting assembly 1000.

[0036] refer to Figure 1 As shown, in some embodiments of the present invention, the casting assembly 1000 includes a platform 200, the platform 200 is used to place the steel liquid mold string, and the platform 200 is provided with a gravity sensor, and the gravity sensor is connected to the driving device. When the steel liquid mold string is placed on the platform 200, the gravity sensor is subjected to pressure and transmits a signal to the driving device, so that the driving device drives the reduction cover 100 downward to cover the casting. The processing efficiency of the casting assembly is improved.

[0037] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A casting assembly (1000), characterized in that: include: A reduction cover (100) is formed with a first cavity (130) for placing the casting inside, and the reduction cover (100) is provided with a first air inlet (110) and a first air overflow port (120) at intervals, and the first air inlet (110) and the first air overflow port (120) are both connected to the first cavity (130); An exhaust device (300) is connected to the first air inlet (110) via a first pipeline (310), and the exhaust device (300) is used to transport protective gas into the first cavity (130).

2. The casting assembly (1000) according to claim 1, characterized in that: The casting assembly (1000) further comprises a furnace (400) and a protective cover (500), wherein the protective cover (500) is in contact with the upper end of the furnace (400), and a second cavity (530) is formed between the protective cover (500) and the furnace (400), and the protective cover (500) is provided with a second air inlet (520) and a second air overflow port (510) at intervals, and the second air inlet (520) and the second air overflow port (510) are both connected to the second cavity (530), and the exhaust device (300) is connected to the second air inlet (520) via a second pipe (320).

3. The casting assembly (1000) according to claim 2, characterized in that: An induction coil (410) is provided on the outer peripheral wall of the melting furnace (400), and the induction coil (410) is used to heat the melting furnace (400).

4. The casting assembly (1000) according to claim 3, characterized in that: A plurality of the induction coils (410) are provided, and the plurality of induction coils (410) are arranged in an interval and surround the outer peripheral wall of the melting furnace (400) in the up-down direction.

5. The casting assembly (1000) according to claim 1, characterized in that: A diverter valve is provided in the first pipeline (310), and the diverter valve is located at the connection between the first pipeline (310) and the first air inlet (110).

6. The casting assembly (1000) according to claim 1, characterized in that: The casting component (1000) further comprises an oxygen content detector (600), wherein the oxygen content detector (600) is connected to the exhaust device (300), and the oxygen content detector (600) is used to detect the oxygen content of the protective gas in the exhaust device (300).

7. The casting assembly (1000) according to claim 1, characterized in that: The casting assembly (1000) further comprises a dehumidifier (700), wherein the dehumidifier (700) is connected to the exhaust device (300), and the dehumidifier (700) is used to absorb moisture in the protective gas.

8. The casting assembly (1000) according to claim 1, characterized in that: The casting assembly (1000) further comprises a pressure reducing device (800), wherein the pressure reducing device (800) is connected to the exhaust device (300), and the pressure reducing device (800) is used to reduce the gas pressure in the first cavity (130).

9. The casting assembly (1000) according to claim 1, characterized in that: The casting assembly (1000) further comprises a driving device, wherein the driving device is used to drive the reduction cover (100) to move in a direction close to the casting to cover the casting, or to drive the reduction cover to move in a direction away from the casting.

10. The casting assembly (1000) according to claim 9, characterized in that The casting assembly (1000) further comprises a platform (200), wherein the platform (200) is used to place the casting, and the platform (200) is provided with a gravity sensor, and the gravity sensor is connected to the driving device.

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