Metal barrier plate pouring basin device

Abstract

The present invention relates to casting pouring equipment, and in particular to an effective device for blocking the initially poured metal molten oxide slag, so that it can float on the liquid surface of the pouring basin before the casting is poured. Under the action of the pouring basin pressure head and the high temperature of the metal, the metal barrier can automatically control the liquid flow rate of the pouring port, thereby avoiding the failure of slag blocking and pouring. The pouring basin device includes a pouring basin sand box with a pouring basin sand mold, and a casting cavity arranged below the pouring basin sand box. The pouring port of the pouring basin sand mold is connected to the straight runner of the casting cavity, including a metal barrier. The metal barrier is arranged in the pouring port, and the plane where the metal barrier is located is perpendicular to the central axis of the pouring port. The metal barrier is provided with a barrier hole. The present invention has a simple structure and is easy to use, and effectively avoids the problems of slag blocking failure and pouring failure. The present invention is particularly suitable for casting pouring occasions.

Description

Technical Field

[0001] The invention relates to casting pouring equipment, in particular to a metal barrier plate pouring basin device. Background Art

[0002] The pouring basin is a device used to receive the molten metal from the ladle and inject it into the sprue and into the mold cavity during the casting process. Its main function is to block the oxidation slag and bubbles from the molten iron and make them float to the top of the pouring basin. The second is to effectively prevent the molten metal from splashing and slow down the impact of the liquid flow on the sand mold.

[0003] For medium and large castings, conventional pouring basins generally do not have an efficient slag blocking function. The temperature of the pouring basin and the molten metal will drop rapidly, accompanied by the generation of a large amount of gas and inclusions. If there are no blocking measures, they will be drawn into the mold cavity, causing serious casting quality problems. Patent No. CN201710383909.3 discloses a semi-permanent double pouring basin combination structure and its combined use method. The pouring liquid received by the first pouring basin flows into the second pouring basin through a U-shaped channel at a lower flow rate, separating the turbulent area from the pouring horizontal flow area, overcoming the problem of being unable to block slag due to turbulence. However, the cost of using a double pouring basin combination structure is relatively high, which is not conducive to installing vent holes or placing weights on castings. The patent with patent number CN202110305570.1 discloses a pouring basin and a method for making and using it. The inlet plugging piece automatically melts at the specified time to achieve timed pouring, reduce slag inclusion, avoid defects such as air entrapment and cold shut. However, the pouring basin cannot control the liquid flow rate. If the liquid flow rate is too large when the plugging piece melts at the beginning, the slag blocking effect will not be obvious due to eddy currents. In addition, the design and calculation requirements of the plugging piece are high, and there is even the possibility of pouring failure due to insufficient melting of the plugging piece due to insufficient iron liquid temperature and the pouring basin pressure head height. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a metal barrier piece for effectively blocking the oxide slag of the initially poured molten metal, so that it can float on the liquid surface of the pouring basin before the casting is poured. Under the action of the pouring basin pressure head and the high temperature of the metal, the metal barrier piece can automatically control the liquid flow rate of the pouring port, thereby avoiding the failure of the slag blocking and the pouring failure of the metal barrier piece pouring basin device.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a metal barrier plate pouring basin device, including a pouring basin sand box with a pouring basin sand mold inside, and a casting cavity arranged below the pouring basin sand box, the pouring port of the pouring basin sand mold is connected to the straight runner of the casting cavity, including a metal barrier plate, the metal barrier plate is arranged in the pouring port, the plane where the metal barrier plate is located is perpendicular to the central axis of the pouring port, and the metal barrier plate is provided with barrier plate holes.

[0006] Furthermore, an upper refractory ceramic tube and a lower refractory ceramic tube are sleeved in the pouring nozzle, and the metal barrier sheet is arranged between the upper refractory ceramic tube and the lower refractory ceramic tube.

[0007] Furthermore, the upper refractory ceramic tube and the lower refractory ceramic tube have the same diameter, which ranges from 80 mm to 110 mm.

[0008] Furthermore, the diameter of the pores of the barrier sheet ranges from 2 mm to 5 mm.

[0009] Furthermore, the thickness of the pores of the barrier sheet ranges from 1 mm to 3.5 mm.

[0010] Furthermore, the metal barrier is made of Q235 steel.

[0011] Furthermore, a pouring basin dam is provided at the bottom of the pouring basin formed by the pouring basin sand mold, and a slag retaining core is provided on the pouring basin dam.

[0012] Furthermore, the gap distance between the pouring basin dam and the bottom of the slag retaining core ranges from 40mm to 50mm.

[0013] Furthermore, the casting cavity and the sprue are connected via an ingrowth.

[0014] Furthermore, the ingates and the sprues are connected via a runner.

[0015] The beneficial effects of the present invention are as follows: due to the presence of the metal barrier, at the beginning of pouring, due to the tension of the molten metal and the initial effect of the metal barrier on the temperature of the molten metal, the molten metal will not enter the sprue from the small holes of the barrier, thereby avoiding defects such as cold shut and slag inclusion. Subsequently, the metal barrier begins to melt at the small holes of the barrier, and the molten iron begins to gradually flow into the casting cavity in large quantities until the pouring is completed. The present invention has a simple structure and is easy to use, and effectively avoids the problems of slag blocking failure and pouring failure. The present invention is particularly suitable for casting pouring occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 Schematic diagram of the metal barrier sheet of the present invention.

[0018] Marked in the figure are: pouring basin sand mold 1, pouring basin sand box 2, sand box lifting ear 3, pouring basin 4, slag retaining core 5, metal barrier 6, upper refractory ceramic tube 7, lower refractory ceramic tube 8, casting sand mold 9, straight runner 10, cross runner 11, inner runner 12, casting cavity 13, pouring gate 14, sand box vent 21, pouring basin dam 51, barrier plate small hole 61. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings.

[0020] like Figure 1 , Figure 2 The metal barrier plate pouring basin device shown includes a pouring basin sand box 2 with a pouring basin sand mold 1 therein, and a casting cavity 13 arranged below the pouring basin sand box 2, the pouring gate 14 of the pouring basin sand mold 1 is connected to the sprue 10 of the casting cavity 13, and includes a metal barrier plate 6, the metal barrier plate 6 is arranged in the pouring gate 14, the plane where the metal barrier plate 6 is located is perpendicular to the central axis of the pouring gate 14, and the metal barrier plate 6 is provided with a barrier plate hole 61.

[0021] In order to better realize the arrangement of the metal barrier sheet 6 in the pouring port 14 and ensure the stability of the position of the metal barrier sheet 6 during casting, the following scheme is preferred: the pouring port 14 is sleeved with an upper refractory ceramic tube 7 and a lower refractory ceramic tube 8, and the metal barrier sheet 6 is arranged between the upper refractory ceramic tube 7 and the lower refractory ceramic tube 8. The upper refractory ceramic tube 7 and the lower refractory ceramic tube 8 firmly clamp the metal barrier sheet 6, so as to maintain a stable process when the metal barrier sheet 6 melts. Generally, the material of the metal barrier sheet 6 is preferably Q235 steel.

[0022] In practice, in order to ensure the quality of processing, the diameters of the upper refractory ceramic tube 7 and the lower refractory ceramic tube 8 are preferably the same, ranging from 80mm to 110mm. Similarly, the diameter of the barrier plate hole 61 is preferably in the range of 2mm to 5mm, and the thickness of the barrier plate hole 61 is preferably in the range of 1mm to 3.5mm, to ensure that the flow of the molten iron is stable and controllable.

[0023] Preferably, the bottom of the pouring basin 4 formed by the pouring basin sand mold 1 is provided with a pouring basin dam 51, and a slag retaining core 5 is provided on the pouring basin dam 51. The pouring basin dam 51 divides the pouring basin 4 into left and right sides. Figure 1 As shown, when pouring begins, pour molten metal into the pouring basin 4, with the drop point on the left side of the pouring basin dam 51, away from the pouring port 14 on the right side of the dam. When the appropriate pouring speed is reached, the molten metal flows into the right side of the pouring basin dam 51, avoiding the formation of a horizontal vortex at the pouring port 14 due to the low liquid level, which is beneficial to the separation of gas and slag inclusions. Preferably, the gap distance between the pouring basin dam 51 and the bottom of the slag retaining core 5 is in the range of 40mm-50mm.

[0024] In actual use, it is preferred that the casting cavity 13 and the sprue 10 are connected via the ingrowth 12, and it is preferred that the ingrowth 12 and the sprue 10 are connected via the runner 11, so as to ensure smooth casting.

[0025] like Figure 1 and Figure 2As shown, a pouring basin sand mold 1 is arranged in the pouring basin sand box 2, and the inner cavity of the pouring basin sand mold 1 forms a pouring basin 4. The pouring basin 4 has an inclined surface, which is set to facilitate the demolding when making the pouring basin. The side surface of the pouring basin sand box 2 is provided with a sand box lifting lug 3, which is convenient for lifting and turning the pouring basin sand box 2 when making the pouring basin. A plurality of sand box vents 21 are opened on the outside of the pouring basin sand box 2, and their function is to prevent these gases from entering the casting cavity 13 with the metal liquid when the high-temperature molten iron enters the pouring basin and reacts with the sand mold to produce a large amount of sulfide gas, hydrogen, etc. A pouring port 14 is opened on the right side of the bottom of the pouring basin sand mold 1, and a metal barrier 6, an upper refractory ceramic tube 7, and a lower refractory ceramic tube 8 are arranged in the pouring port 14. The metal barrier 6 is in contact with the lower end of the upper refractory ceramic tube 7 and is installed on the upper end of the lower refractory ceramic tube 8. Generally, the diameter and thickness of the metal barrier 6 and the barrier hole 61 increase with the increase of the weight of the casting. The diameter of the metal barrier 6, the pouring port 14, the outer wall diameter of the upper refractory ceramic tube 7, and the outer wall diameter of the upper refractory ceramic tube 7 are the same, preferably 80mm-110mm; the diameter of the barrier hole 61 is preferably 2mm-5mm; the thickness of the metal barrier 6 is preferably 1mm-3.5mm. When pouring begins, due to the tension of the molten metal and the initial influence of the metal barrier 6 on the temperature of the molten metal, no cold molten metal will enter the sprue 10 from the barrier hole 61. Depending on the size of the aperture, the time of the molten metal flow will also be different. In the embodiment, when we take the diameter of the small hole as 2mm, the metal can last for more than 8s in the pouring basin. At this time, the molten iron in the pouring basin is already full or nearly full. At this time, the liquid surface of the pouring basin 4 is basically full, and the oxide slag and the like float to the liquid surface to ensure the purity of the molten metal. As time goes by, the small holes 61 of the barrier plate begin to melt and expand rapidly, controlling the liquid outflow rate of the pouring port 14, thereby overcoming the problem of slag blocking failure due to eddy currents; further, under the action of pressure, the metal barrier plate 6 is instantly damaged and melted, and a large flow of molten metal enters the straight runner 10, and the casting of the casting is completed within the specified time. A slag blocking core 5 is provided in the middle of the pouring basin 4. When pouring starts, the liquid falls on the left side of the dam of the pouring basin 4. When the appropriate pouring speed is reached, the molten metal flows into the right side of the dam, avoiding the formation of a horizontal vortex at the pouring port 14 due to the low liquid level, which is beneficial to the separation of gas and slag inclusions. As time goes by, the oxide slag floating on the liquid surface on the left side of the dam is blocked by the slag blocking core 5, which to a certain extent blocks the oxide slag from flowing into the straight runner 11 with the molten metal, thereby improving the yield rate of the casting.

[0026] The entire casting process is described below using a casting example.

[0027] When pouring begins, pour molten metal into the pouring basin 4, with the liquid falling on the left side of the pouring basin dam 51 and away from the pouring port 14 on the right side of the pouring basin dam 51. When the appropriate pouring speed is reached, the molten metal flows into the right side of the pouring basin dam 51, avoiding the formation of a horizontal vortex at the pouring port 14 due to the low liquid level, which is beneficial for separating gas and slag inclusions. When filling the pouring basin 4, within a time range of less than 8s, due to the tension of the molten metal and the initial influence of the metal barrier 6 on the temperature of the molten metal, the molten metal will not enter the straight runner 10 from the barrier hole 61, thereby avoiding defects such as cold shut and slag inclusion. When the pouring time is 8-11s, the metal barrier 6 begins to melt at the barrier hole 61. At this time, the pouring basin 4 is filled, and all slag will float on the surface of the molten iron. The slag blocking core 5 also plays a secondary slag blocking role, fully ensuring the purity of the molten iron. When the pouring time is 11-13s and the liquid flow column is about 40-60%, the metal barrier 6 will be instantly damaged and melted under the action of pressure and high temperature, and a large amount of molten iron will be injected into the sprue 10 and enter the cavity. After the pouring time is about 8s, the liquid flow continues to increase, so the molten iron poured from the ladle into the pouring basin should keep the liquid level basically unchanged, and the molten metal flows into the casting cavity 13 through the sprue 10, the runner 11, and the inner runner 12 in turn until the pouring is completed.

Claims

1. A metal barrier plate pouring basin device, comprising a pouring basin sand box (2) in which a pouring basin sand mold (1) is arranged, and a casting cavity (13) arranged below the pouring basin sand box (2), wherein a pouring port (14) of the pouring basin sand mold (1) is connected to a sprue (10) of the casting cavity (13), and comprising a metal barrier plate (6), wherein the metal barrier plate (6) is arranged in the pouring port (14), wherein a plane where the metal barrier plate (6) is located is perpendicular to a central axis of the pouring port (14), a pouring basin dam (51) is arranged at the bottom of the pouring basin (4) formed by the pouring basin sand mold (1), a slag retaining core (5) is arranged on the pouring basin dam (51), and a gap distance between the pouring basin dam (51) and the bottom of the slag retaining core (5) is in a range of 40 mm to 50 mm, and characterized in that: The metal barrier sheet (6) is provided with a barrier sheet small hole (61); an upper refractory ceramic tube (7) and a lower refractory ceramic tube (8) are sleeved and arranged inside the pouring port (14); the metal barrier sheet (6) is arranged between the upper refractory ceramic tube (7) and the lower refractory ceramic tube (8); the upper refractory ceramic tube (7) and the lower refractory ceramic tube (8) have the same diameter; the diameter range of the upper refractory ceramic tube (7) and the lower refractory ceramic tube (8) is 80 mm-110 mm; the diameter range of the barrier sheet small hole (61) is 2 mm-5 mm; and the thickness range of the barrier sheet small hole (61) is 1 mm-3.5 mm.

2. The metal barrier plate pouring basin device according to claim 1, characterized in that: The material of the metal barrier sheet (6) is Q235 steel.

3. The metal barrier plate pouring basin device according to claim 1, characterized in that: The casting cavity (13) and the sprue (10) are connected via an endogate (12).

4. The metal barrier plate pouring basin device according to claim 3, characterized in that: The ingrate (12) and the sprue (10) are connected via a runner (11).

Images