Filter box for low pressure casting of molten aluminum

Abstract

The utility model relates to the aluminium and aluminium alloy melt low pressure casting filter product technical field, aims at providing a kind of filter box for aluminium liquid low pressure casting, including the filter box of square or circular structure, the filter box inside is equipped with round cavity;The filter box outer corner is equipped with edge banding slurry, and two hoisting holes that are symmetrical are also equipped on the filter box upper end side surface.The filter box for aluminium liquid low pressure casting of the utility model has the characteristics such as simple structure, good aluminium liquid filtering effect, aluminium liquid flush type stability and low use cost, can be widely used in aluminium and aluminium alloy melt low pressure casting technical field.

Description

Technical Field

[0001] This utility model relates to the technical field of products for filtering aluminum and aluminum alloy melts in low-pressure casting, specifically, it is a filter box for low-pressure casting of molten aluminum. Background Technology

[0002] Low-pressure casting of aluminum and aluminum alloy melts is an important casting process for producing aluminum alloy products. It uses low-pressure gas (0.01~0.15MPa) to force molten metal from a crucible or holding furnace into a casting mold. It features smooth molding, high density, and good physical and chemical properties of the castings. It is particularly suitable for producing aluminum alloy castings with complex shapes, thin walls, and high surface quality requirements, and is widely used in the automotive, aerospace, electronics, and machinery industries.

[0003] Currently, existing low-pressure casting methods for molten aluminum typically place a filter screen at the bottom of the mold or at the gating point to filter the molten aluminum and prevent turbulence. For example, patent application number "201822056980.3" discloses a low-pressure casting mold with a fiber filter screen, comprising a lower mold, an upper mold, and side molds, which are assembled together to form a cavity and gating system. A fiber filter screen is placed between the lower and upper mold sections. This filter screen can block impurities that enter the cavity with the molten aluminum during pressurization, improving the casting yield. However, existing fiber filter screens need to be replaced after each use, making production operations cumbersome and costly. Furthermore, the existing filter screens have large pores, resulting in poor filtration efficiency. Therefore, a filter box that filters at the bottom of the molten aluminum is needed to consistently improve the filtration effect and avoid the tedious operation of frequently replacing the filter screen, which is of great significance for low-pressure casting production of molten aluminum. Summary of the Invention

[0004] The purpose of this utility model is to provide a filter box for low-pressure casting of molten aluminum, which has the characteristics of simple structure, good filtration effect of molten aluminum, stable casting of molten aluminum and low cost of use, and can be widely used in the field of low-pressure casting technology of molten aluminum and aluminum alloy.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a filter box for low-pressure casting of molten aluminum, comprising a filter box body with a square or circular structure, wherein a circular cavity is provided inside the filter box body; an edge-sealing slurry is provided at the outer corners of the filter box body, and two symmetrical lifting holes are provided on the upper side of the filter box body.

[0006] As an improvement, the filter housing has a square cavity inside.

[0007] As an improvement, the edging slurry is a silicon carbide ceramic slurry, and the edging thickness of the edging slurry is 10~30mm.

[0008] As an improvement, the lifting hole is a circular through hole with a circular nut inside.

[0009] As an improvement, the center of the hoisting hole is 15-45mm above the top of the filter box.

[0010] As an improvement, the box wall on one side of the hoisting hole is provided with a thickened layer, the thickness of which is 5~15mm.

[0011] As an improvement, the filter housing is composed of ceramic particles and ceramic slurry, wherein the ceramic particles have a particle size of 1-7 mm, and the ceramic slurry is composed of a high-temperature inorganic binder and ceramic powder.

[0012] As an improvement, the ceramic particles are one of silicon carbide ceramic particles, alumina ceramic particles, or aluminum titanate ceramic particles, and are formed by vibration pressing using an integrated mold, followed by sintering at a high temperature of 600~1000℃.

[0013] As an improvement, the filter box is placed inside a low-pressure heat preservation furnace, which contains high-temperature molten aluminum. Under the pressure of the low-pressure heat preservation furnace, the high-temperature molten aluminum is filtered through the porous particle filter structure around the box and then enters the filter box. The filtered high-temperature molten aluminum is then transported to the casting mold through a riser pipe inserted inside the filter box.

[0014] As an improvement, the filter box is submerged at the bottom of the low-pressure insulation furnace and is higher than the liquid level of the high-temperature aluminum liquid.

[0015] The beneficial effects of this utility model are as follows: A filter box for low-pressure casting of molten aluminum has the characteristics of simple structure, good filtration effect of molten aluminum, stable casting of molten aluminum, and low operating cost. By adopting a square filter box structure, and the entire filter box is composed of ceramic particles and ceramic slurry, it can achieve a good filtration and purification effect on molten aluminum. At the same time, because the filter box uses high-temperature resistant, high-density silicon carbide ceramic particles, alumina ceramic particles, or aluminum titanate ceramic particles, the box can be stably submerged at the bottom of the low-pressure holding furnace. The ceramic components will not contaminate the molten aluminum and provide a continuous and stable filtration effect. The service life can reach 1 to 3 months. By setting lifting holes on both sides of the upper end of the filter box, it is convenient to put the filter box into the high-temperature low-pressure holding furnace and avoid damage to the filter box. In addition, by setting edge-sealing slurry at the external corners of the filter box, the overall strength of the filter box is effectively improved, and the service life of the filter box is extended. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the filter box structure for low-pressure casting of molten aluminum according to this utility model; Figure 2This is a top view of the filter box for low-pressure casting of molten aluminum according to this utility model; Figure 3 This is a schematic diagram of the internal square structure of the filter box for low-pressure casting of molten aluminum according to this utility model; Figure 4 This is a top view of the square interior of the filter box for low-pressure casting of molten aluminum according to this utility model; Figure 5 This is a schematic diagram of the structure of the filter box for low-pressure casting of molten aluminum according to this utility model during use.

[0017] In the diagram: 1. Filter box; 2. Circular cavity; 3. Edge-sealing slurry; 4. Lifting hole; 5. Square cavity; 6. Low-pressure heat preservation furnace; 7. High-temperature aluminum liquid; 8. Lifting pipe; 9. Casting mold. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: Figures 1-2 As shown, the present invention discloses a filter box for low-pressure casting of molten aluminum, comprising a filter box body 1 with a square or circular structure. Specifically, the filter box body 1 with a square structure has a larger filtration area, while the filter box body 1 with a circular structure can improve the pressure resistance of the filter box body and ensure consistent pressure in each direction, resulting in more uniform filtration of molten aluminum. The filter box body 1 has a circular cavity 2 inside. The filter box body 1 has edge-sealing slurry 3 at its external corners, and two symmetrical lifting holes 4 are provided on the upper side of the filter box body 1.

[0019] Furthermore, such as Figures 3-4 As shown, the filter box 1 has a square cavity 5 inside. Specifically, the square cavity 5 has a larger liquid storage space than the circular cavity 2, which makes it easier for the aluminum liquid to rise.

[0020] Furthermore, the edge-sealing slurry 3 is a silicon carbide ceramic slurry, and the thickness of the edge-sealing slurry 3 is 10~30mm, preferably 15~20mm. Specifically, the edge-sealing slurry 3 can completely fill the gaps between particles, making the filter box have higher service strength. At the same time, since the edge-sealing slurry 3 is located at the outer corner of the box, it minimizes the impact on the filtration efficiency of the aluminum liquid.

[0021] Furthermore, the lifting hole 4 is a circular through hole with a circular nut inside; specifically, the distance from the center of the lifting hole 4 to the top of the filter box 1 is 15~45mm, preferably 30~35mm; the circular nut is an embedded part, through which bolts can be connected, and the entire filter box can be lifted by the bolts, thereby facilitating the installation of the filter box and avoiding damage during installation at high temperatures; further still, the box wall on one side of the lifting hole 4 has a thickened layer with a thickness of 5~15mm, which improves the lifting strength and prevents damage to the lifting hole during lifting. Further, the...

[0022] Furthermore, the filter housing 1 is composed of ceramic particles and ceramic slurry. The ceramic particles have a particle size of 1-7 mm, preferably 3-5 mm, and the ceramic slurry is composed of a high-temperature inorganic binder and ceramic powder. Specifically, the ceramic particles are one of silicon carbide ceramic particles, alumina ceramic particles, or aluminum titanate ceramic particles, preferably silicon carbide particles. They are formed by vibration pressing using an integrated mold, and then sintered at a high temperature of 600-1000℃, preferably 700-900℃. The high-temperature sintering mainly provides bonding strength to the ceramic slurry, thereby ensuring the strength of the filter housing.

[0023] Furthermore, such as Figure 5 As shown, the filter box 1 is placed inside a low-pressure holding furnace 6, which contains high-temperature molten aluminum 7. Under the pressure of the low-pressure holding furnace 6, the high-temperature molten aluminum 7 is filtered through the porous particle filter structure around the box and then enters the filter box 1. The filtered high-temperature molten aluminum is then transported to the casting mold 9 through the riser pipe 8 inserted inside the filter box 1, thereby completing the production of low-pressure aluminum alloy castings. Specifically, the filter box 1 is submerged at the bottom of the low-pressure holding furnace 6 and is higher than the surface of the high-temperature molten aluminum 7. Submerging at the bottom avoids impacting the riser pipe, and being higher than the molten aluminum prevents the molten aluminum from directly entering the filter box from the top cavity opening, thus achieving the effect of completely filtering the molten aluminum.

[0024] This utility model of a filter box for low-pressure casting of molten aluminum features a simple structure, good filtration effect, stable casting process, and low operating cost. Its working principle is as follows: The filter box 1, with an outer square shape and an inner circular shape, is preheated. Bolts are connected through the nuts inside the lifting holes 4, or lifting ropes are passed directly through them. Bolts on both sides of the box are connected via hooks. The filter box 1 is gently lowered into the bottom of the low-pressure holding furnace 6 through the top riser pipe installation hole. The position of the filter box 1 is adjusted and kept level. The riser pipe 8 is then placed into the cavity of the filter box 1. The surface of the high-temperature molten aluminum 7 remains lower than the height of the filter box 1. Under low pressure, the high-temperature molten aluminum 7 is filtered through the particle filtration structure around the filter box and enters the interior of the box. Under continuous pressure, the filtered high-temperature molten aluminum 7 flows upwards along the cavity inside the riser pipe 7 into the casting mold 9. Casting is completed after the molten aluminum fills the entire mold cavity and is held under pressure for a certain period.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A filter box for low pressure casting of molten aluminum, characterized by, The filter box (1) includes a square or round structure, and the filter box (1) has a circular cavity (2) inside; the filter box (1) has edge-sealing slurry (3) at the outer corners; and two symmetrical hoisting holes (4) are provided on the upper side of the filter box (1).

2. The filter box for low pressure casting of molten aluminum according to claim 1, characterized by, The filter box (1) has a square cavity (5) inside.

3. The filter box for low pressure casting of molten aluminum according to claim 1, characterized by, The edge-sealing slurry (3) is a silicon carbide ceramic slurry, and the thickness of the edge-sealing slurry (3) is 10~30mm.

4. The filter box for low pressure casting of molten aluminum according to claim 1, characterized by, The lifting hole (4) is a circular through hole with a circular nut inside.

5. The filter box for low pressure casting of molten aluminum according to claim 4, characterized by The center of the hoisting hole (4) is 15-45 mm above the top of the filter box (1).

6. The filter box for low pressure casting of molten aluminum according to claim 4 or 5, characterized by The box wall on one side of the hoisting hole (4) is provided with a thickened layer, the thickness of which is 5~15mm.

7. The filter box for low pressure casting of molten aluminum according to claim 1, characterized by The filter box (1) is placed inside a low-pressure heat preservation furnace (6), which contains high-temperature aluminum liquid (7). Under the pressure of the low-pressure heat preservation furnace (6), the high-temperature aluminum liquid (7) is filtered through the porous particle filter structure around the box and enters the filter box (1). The filtered high-temperature aluminum liquid is then transported to the casting mold (9) through the riser pipe (8) inserted inside the filter box (1).

8. The filter box for low pressure casting of molten aluminum according to claim 7, characterized by The filter box (1) is submerged at the bottom of the low-pressure heat preservation furnace (6) and is higher than the liquid surface of the high-temperature aluminum liquid (7).

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