Degassing device of low-pressure casting machine

Abstract

The utility model relates to the technical field of low-pressure casting, and discloses a degassing device of a low-pressure casting machine table, the low-pressure casting machine table comprises a furnace body and a furnace door arranged on the furnace body, the degassing device comprises a degassing disc and a molten aluminum bottom arranged in a cavity of the furnace body, a cavity and an air channel are arranged in the degassing disc, and the cavity and the air channel are communicated. A plurality of air holes are formed in the surface of the degassing disc and are communicated with the cavity; one end of the gas inlet pipe is communicated with the gas channel, the end, away from the gas channel, of the gas inlet pipe extends out of the furnace body through the position of the furnace door and is communicated with nitrogen, and the gas inlet pipe is pushed to enable the degassing disc to move in the cavity of the furnace body. According to the device, the number of inclusions in the furnace body can be effectively reduced, the purity of molten aluminum of a casting machine table is improved, and the slag inclusion rejection rate of a post-station is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-pressure casting, in particular to a degassing device for a low-pressure casting machine. Background Art

[0002] In the production of cast aluminum alloy wheels, the purity of the raw material aluminum liquid is crucial to the casting production of wheels. If the purity of the aluminum liquid is low, the wheels produced will have more defects due to the presence of more inclusions, and the mechanical properties and bending fatigue properties of the wheels will decrease, eventually leading to product test failures, increased scrapping, and higher production costs for enterprises.

[0003] The casting machine is the last link in the wheel casting production. The raw material aluminum liquid is added to the casting machine after refining, slag removal, degassing, and standing. The initial aluminum liquid quality is relatively pure, but as time goes on, the aluminum liquid in the casting machine is constantly exposed to oxygen in the air, generating more alumina inclusions, and the inclusion content gradually increases. However, since the casting machine is in continuous production and the furnace door is small, it is difficult to degas and deslag inside the aluminum liquid. At present, the effective way to reduce the inclusions in the aluminum liquid is generally to add a filter screen to the liquid riser to filter the inclusions, but the smaller inclusions inside the aluminum liquid of the casting machine still cannot be completely filtered. Utility Model Content

[0004] The utility model aims to provide a degassing device for a low-pressure casting machine, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the utility model provides the following solution: The utility model provides a degassing device for a low-pressure casting machine, the low-pressure casting machine comprising a furnace body and a furnace door arranged on the furnace body, the degassing device comprising:

[0006] A degassing plate, which is used to be arranged at the bottom of the aluminum liquid in the chamber of the furnace body, wherein the degassing plate has a connected cavity and an air passage, and the surface of the degassing plate has a plurality of air holes, and the air holes are connected to the cavity;

[0007] An air inlet pipe has one end connected to the air duct, and one end of the air inlet pipe away from the air duct extends out of the furnace body through the furnace door position and is connected to nitrogen. The degassing plate is moved in the furnace body chamber by pushing the air inlet pipe.

[0008] Optionally, the air inlet pipe includes a hollow graphite rod and an iron pipe that are connected to each other, the hollow graphite rod is connected to the airway, and the iron pipe extends out of the furnace body.

[0009] Optionally, the degassing disk is made of graphite.

[0010] Optionally, the air passage includes a first channel and an I-shaped channel that are connected to each other, the first channel is connected to the air inlet pipe, the I-shaped channel is connected to a plurality of connecting holes, and the connecting holes are connected to the cavity.

[0011] Optionally, the degassing plate comprises an upper plate and a lower plate, the air holes are arranged in the upper plate, and the cavity and the air channel are arranged in the lower plate.

[0012] Optionally, the pore diameter is 1 mm.

[0013] The utility model also provides a low-pressure casting machine, comprising:

[0014] Furnace body;

[0015] A furnace door, arranged on the furnace body;

[0016] A degassing device for a low-pressure casting machine, wherein the degassing plate is arranged at the bottom of the aluminum liquid in the furnace chamber, and one end of the air inlet pipe away from the air duct extends out of the furnace body through the furnace door.

[0017] Optionally, a liquid riser is connected to the furnace chamber.

[0018] The utility model discloses the following technical effects: an end of an air inlet pipe away from a degassing disk is extended out of the furnace body and connected with nitrogen, the nitrogen is introduced into the air duct in the degassing disk through the air inlet pipe, the nitrogen is evenly introduced into the cavity through the air duct, and is discharged from a plurality of air holes to enter the aluminum liquid in the furnace body cavity, the generated nitrogen bubbles are combined with the slag inclusions in the aluminum liquid and are brought to the surface of the aluminum liquid, so as to achieve the effect of purifying the aluminum liquid in the low-pressure insulation furnace, and the end of the air inlet pipe extending out of the furnace body serves as a carrier for moving the degassing disk, and the degassing disk is driven to move in the furnace body cavity by moving the air inlet pipe, and the bottom of the aluminum liquid is fully degassed and deslaged around, thereby effectively reducing the number of inclusions in the furnace body, improving the purity of the aluminum liquid of the casting machine, and reducing the scrap rate of slag inclusions in the back station. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the degassing disk structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the lower plate structure of the utility model;

[0023] Figure 4It is a schematic diagram of the upper plate structure of the utility model.

[0024] In the figure: 1. furnace body; 2. furnace door; 3. degassing plate; 31. upper plate; 32. lower plate; 4. cavity; 5. airway; 51. first channel; 52. I-shaped channel; 53. connecting hole; 6. air hole; 7. air inlet pipe; 71. hollow graphite rod; 72. iron pipe; 8. liquid riser. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Reference Figure 1-Figure 4 The utility model provides a degassing device for a low-pressure casting machine, the low-pressure casting machine comprises a furnace body 1, a furnace door 2 arranged on the furnace body 1, and the degassing device comprises:

[0028] The degassing plate 3 is used to be arranged at the bottom of the aluminum liquid in the chamber of the furnace body 1. The degassing plate 3 has a connected cavity 4 and an air passage 5. The surface of the degassing plate 3 has a plurality of pores 6, and the pores 6 are connected to the cavity 4.

[0029] One end of the air inlet pipe 7 is connected to the air duct 5, and the end of the air inlet pipe 7 away from the air duct 5 extends out of the furnace body 1 through the furnace door 2 and is connected to the nitrogen. The degassing plate 3 is moved in the chamber of the furnace body 1 by pushing the air inlet pipe 7.

[0030] The end of the air inlet pipe 7 away from the degassing plate 3 is extended out of the furnace body 1 and connected with nitrogen, and the nitrogen is introduced into the air channel 5 in the degassing plate 3 through the air inlet pipe 7. The nitrogen is evenly introduced into the cavity 4 by the air channel 5 and discharged from a plurality of air holes 6 to enter the aluminum liquid in the chamber of the furnace body 1. The generated nitrogen bubbles are combined with the slag included in the aluminum liquid and brought to the surface of the aluminum liquid, so as to achieve the effect of purifying the aluminum liquid in the low-pressure insulation furnace. The end of the air inlet pipe 7 extending out of the furnace body 1 serves as a carrier for moving the degassing plate 3. The degassing plate 3 is driven to move in the chamber of the furnace body 1 by moving the air inlet pipe 7, and the bottom of the aluminum liquid is fully degassed and deslaged, thereby effectively reducing the number of inclusions in the furnace body 1, improving the purity of the aluminum liquid of the casting machine, and reducing the scrap rate of slag inclusions in the back station.

[0031] According to a further optimized solution, the air inlet pipe 7 includes a hollow graphite rod 71 and an iron pipe 72 which are connected to each other. The hollow graphite rod 71 is connected to the airway 5 , and the iron pipe 72 extends out of the furnace body 1 .

[0032] The iron pipe 72 is used for the operator to hold, so as to facilitate the movement of the degassing plate 3 in the inner chamber of the furnace body 1 .

[0033] According to a further optimization scheme, the degassing disk 3 is made of graphite.

[0034] According to a further optimized solution, the air passage 5 includes a first channel 51 and an I-shaped channel 52 which are connected to each other. The first channel 51 is connected to the air intake pipe 7 . The I-shaped channel 52 is provided with a plurality of connecting holes 53 which are connected to the cavity 4 .

[0035] The nitrogen is introduced into the I-shaped channel 52 through the first channel 51 and then into the cavity 4 through the plurality of connecting holes 53, so that the nitrogen is evenly dispersed into the cavity 4, thereby avoiding excessive concentration of the gas from a single outlet.

[0036] According to a further optimized solution, the degassing disk 3 includes an upper plate 31 and a lower plate 32 , the air holes 6 are arranged in the upper plate 31 , and the cavities 4 and the air passages 5 are arranged in the lower plate 32 .

[0037] The upper plate 31 and the lower plate 32 are preferably connected by bolts to facilitate assembly of the degassing plate 3 .

[0038] According to the further optimized solution, the diameter of the pore 6 is 1 mm.

[0039] The utility model also provides a low-pressure casting machine, comprising:

[0040] Furnace body 1;

[0041] A furnace door 2 is arranged on the furnace body 1;

[0042] The degassing device of the low-pressure casting machine, the degassing plate 3 is arranged at the bottom of the aluminum liquid in the chamber of the furnace body 1, and the end of the air inlet pipe 7 away from the air duct 5 extends out of the furnace body 1 through the furnace door 2.

[0043] According to a further optimized solution, a liquid riser 8 is connected to the chamber of the furnace body 1 .

[0044] Principle of nitrogen removal: nitrogen is dispersed into tiny bubbles by means of pores 6, so that slag inclusions and gas in the vertical direction of the melt are adsorbed on the surface of the inert body, and finally the effect of slag removal and degassing is achieved.

[0045] Operation method: open the furnace door 2 of the casting machine, and connect the iron pipe 72 to the nitrogen gas source on the outside, set the flow rate to 15L / min, and then place the degassing plate 3 to the bottom of the aluminum liquid in the chamber of the furnace body 1, and move the degassing plate 3 to fully degas and remove slag around the bottom of the aluminum liquid. The degassing time is 15 minutes.

[0046] It has been verified that the K value of aluminum liquid is reduced from 0.75 to 0.3.

[0047] It has been verified that the density of aluminum liquid can reach 2.61g / cm before and after degassing. 3 Increased to 2.63g / cm 3 .

[0048] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" 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 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.

[0049] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A degassing device for a low-pressure casting machine, characterized in that: The low-pressure casting machine comprises a furnace body (1) and a furnace door (2) arranged on the furnace body (1), and the degassing device comprises: A degassing plate (3) is used to be arranged at the bottom of the aluminum liquid in the chamber of the furnace body (1), the degassing plate (3) has a connected cavity (4) and an air passage (5), and the surface of the degassing plate (3) has a plurality of air holes (6), and the air holes (6) are connected to the cavity (4); An air inlet pipe (7) has one end connected to the air duct (5), and an end of the air inlet pipe (7) away from the air duct (5) extends out of the furnace body (1) through the furnace door (2) and is connected to nitrogen. The degassing plate (3) is moved in the chamber of the furnace body (1) by pushing the air inlet pipe (7).

2. The degassing device for a low pressure casting machine according to claim 1, characterized in that: The air inlet pipe (7) comprises a hollow graphite rod (71) and an iron pipe (72) which are connected to each other; the hollow graphite rod (71) is connected to the air passage (5); and the iron pipe (72) extends out of the furnace body (1).

3. The degassing device for a low pressure casting machine according to claim 1, characterized in that: The degassing disk (3) is made of graphite.

4. The degassing device for a low pressure casting machine according to claim 1, characterized in that: The air passage (5) comprises a first channel (51) and an I-shaped channel (52) which are connected to each other, the first channel (51) being connected to the air intake pipe (7), the I-shaped channel (52) being connected to a plurality of connecting holes (53), and the connecting holes (53) being connected to the cavity (4).

5. The degassing device for a low pressure casting machine according to claim 1, characterized in that: The degassing plate (3) comprises an upper plate (31) and a lower plate (32), the air holes (6) are arranged in the upper plate (31), and the cavity (4) and the air channel (5) are arranged in the lower plate (32).

6. The degassing device for a low pressure casting machine according to claim 1, characterized in that: The diameter of the pore (6) is 1 mm.

7. A low pressure casting machine, characterized in that: include: Furnace body (1); A furnace door (2) is arranged on the furnace body (1); The degassing device of the low-pressure casting machine according to any one of claims 1 to 6, wherein the degassing plate (3) is arranged at the bottom of the aluminum liquid in the chamber of the furnace body (1), and the end of the air inlet pipe (7) away from the air duct (5) extends out of the furnace body (1) through the position of the furnace door (2).

8. The low pressure casting machine according to claim 7, characterized in that: A liquid riser (8) is connected to the chamber of the furnace body (1).

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