阅读说明：本技术 一种用于铝合金控制臂生产的低压铸造装置及其使用方法 (Low-pressure casting device for producing aluminum alloy control arm and using method thereof ) 是由 曾利平 于 2021-06-17 设计创作，主要内容包括：本发明公开了一种用于铝合金控制臂生产的低压铸造装置及其使用方法,涉及低压铸造技术领域；为了解决铸型后的铸件存在裂痕的问题；具体包括支撑座,所述支撑座的顶部外壁设置有四个支撑杆,四个支撑杆的顶部外壁设置有同一固定板,固定板的底部外壁设置有气缸,气缸的一侧外壁设置有挤压板,挤压板与四个支撑杆滑动连接,支撑座的一侧外壁设置有控制器,支撑座的底部内壁设置有坩埚；该装置使用方法如下：金属液输送,压合铸型,真空除气,顶出铸件。本发明通过启动循环泵,使得循环泵将储液箱内的冷却液通过循环管在冷却腔内进行循环输送,从而对铸型腔进行缓慢冷却,防止冷却速度过快造成铸型铸件表面产生裂痕和气孔。(The invention discloses a low-pressure casting device for producing an aluminum alloy control arm and a using method thereof, relating to the technical field of low-pressure casting; in order to solve the problem that the cast after casting has cracks; the support comprises a support seat, wherein four support rods are arranged on the outer wall of the top of the support seat, the same fixed plate is arranged on the outer wall of the top of each support rod, an air cylinder is arranged on the outer wall of the bottom of the fixed plate, an extrusion plate is arranged on the outer wall of one side of the air cylinder and is in sliding connection with the four support rods, a controller is arranged on the outer wall of one side of the support seat, and a crucible is arranged on the inner wall of the bottom of the support seat; the using method of the device is as follows: conveying molten metal, pressing the casting mould, vacuum degassing and ejecting the casting. According to the invention, by starting the circulating pump, the circulating pump is used for circularly conveying the cooling liquid in the liquid storage tank in the cooling cavity through the circulating pipe, so that the casting cavity is slowly cooled, and cracks and air holes on the surface of the casting mold caused by too high cooling speed are prevented.)

1. A low-pressure casting device for producing an aluminum alloy control arm comprises a supporting seat (1), the novel casting mold is characterized in that four supporting rods (4) are arranged on the outer wall of the top of the supporting seat (1), the outer wall of the top of each supporting rod (4) is provided with the same fixing plate (6), an air cylinder (7) is arranged on the outer wall of the bottom of the fixing plate (6), an extruding plate (5) is arranged on the outer wall of one side of the air cylinder (7), the extruding plate (5) is in sliding connection with the four supporting rods (4), a controller (11) is arranged on the outer wall of one side of the supporting seat (1), a crucible (22) is arranged on the inner wall of the bottom of the supporting seat (1), a casting mold mechanism is arranged at the top of the crucible (22), two box doors (12) are arranged on the outer wall of one side of the supporting seat (1), a cooling mechanism is arranged on one side of the casting mold mechanism, and a heat dissipation fan (17) is arranged on the outer wall of one side of the supporting seat (1).

2. The low-pressure casting device for producing the aluminum alloy control arm is characterized in that the casting mold mechanism comprises a core (9), a mold cavity (10) and an ejection assembly, the bottom outer wall of the fixed plate (6) is provided with a fixed seat (8), the core (9) is arranged on the bottom outer wall of the fixed seat (8), the mold cavity (10) is arranged on the top outer wall of the supporting seat (1), and the outer wall of one side of the supporting seat (1) is provided with a compressor (13).

3. The low-pressure casting device for producing the aluminum alloy control arm as claimed in claim 2, wherein a gas delivery pipe (14) is arranged at a gas outlet of the compressor (13), a liquid lifting pipe (34) is arranged inside the crucible (22), the casting cavity (10) is connected with the crucible (22) through the liquid lifting pipe (34), a connecting pipe (18) is arranged on the outer wall of one side of the crucible (22), a pressure release valve (19) is arranged on the outer wall of one side of the connecting pipe (18), the ejection assembly is arranged on the inner wall of the bottom of the casting cavity (10), and the wall thickness of the upper part of the casting cavity (10) is greater than that of the lower part of the casting cavity.

4. The low-pressure casting device for producing the aluminum alloy control arm is characterized in that the ejection assembly comprises more than three rack plates (23), a threaded rod (26) and a movable plate (28), a protective shell (27) is arranged on the inner wall of the bottom of the casting cavity (10), a motor is arranged in the protective shell (27), one end of the threaded rod (26) is arranged at the output end of the motor, the movable plate (28) is arranged on the outer wall of the circumference of the threaded rod (26), more than three mounting grooves are formed in the outer wall of one side of the movable plate (28), and a gear (29) is rotatably connected in each mounting groove.

5. The low-pressure casting device for producing the aluminum alloy control arm is characterized in that each rack plate (23) is arranged on the bottom inner wall of the casting cavity (10), each rack plate (23) is in meshed transmission with each gear (29), the outer top wall of the movable plate (28) is provided with more than three ejector rods (24), the outer top wall of each ejector rod (24) is provided with a top plate (25), one side inner wall of the casting cavity (10) is provided with a bearing plate, the bearing plate is connected with the lift pipe (34), and each top plate (25) is in sliding connection with the bearing plate.

6. The low-pressure casting device for producing the aluminum alloy control arm is characterized in that the cooling mechanism comprises a circulating pump (2), a cooling cavity (3) and a liquid storage tank (16), the circulating pump (2) is arranged on the outer wall of the top of the supporting seat (1), the cooling cavity (3) is arranged on the outer wall of the circumference of the casting cavity (10), the liquid storage tank (16) is arranged on the outer wall of the top, close to the circulating pump (2), of the supporting seat (1), circulating pipes (15) are arranged at a water outlet and a water inlet of the circulating pump (2), the other end of each circulating pipe (15) is connected with the liquid storage tank (16), and the outer wall of one side of one circulating pipe (15) is annular and connected with the cooling cavity (3).

7. The low-pressure casting device for producing the aluminum alloy control arm as claimed in claim 1, wherein a sealing plate (32) is arranged on the outer wall of the top of the crucible (22), a rubber pad (33) is arranged between the crucible (22) and the sealing plate (32), more than three positioning pins (21) are arranged on the outer wall of the top of the sealing plate (32), an access hole (31) is formed in the outer wall of the top of the crucible (22), and a fixing ring (35) is arranged at one end of the riser tube (34).

8. The low-pressure casting device for producing the aluminum alloy control arm is characterized in that a filter (30) is arranged on the outer wall of one side of the fixing ring (35), the filter (30) is in a conical shape with a large upper part and a small lower part, a vacuum pump (20) is arranged on the outer wall of the top part of the crucible (22), and the vacuum pump (20) is connected with the casting cavity (10) through a suction pipe.

9. Use of a low pressure casting apparatus for the production of an aluminium alloy control arm according to any one of claims 1 to 8, comprising the steps of:

s1: firstly, starting a compressor (13), so that the compressor (13) conveys compressed gas into a crucible (22) through a gas conveying pipe (14) and a connecting pipe (18), and the molten metal in the crucible (22) is conveyed into a casting cavity (10) through a riser pipe (34) under the action of pressure difference;

s2: then, the cylinder (7) drives the core (9) to extrude the casting cavity (10) so as to perform casting operation;

s3: then, starting a vacuum pump (20), so that the vacuum pump (20) pumps the casting cavity (10) to a vacuum state through a suction pipe, thereby degassing the casting cavity;

s4: after casting, starting the circulating pump (2) to enable the circulating pump (2) to circularly convey the cooling liquid in the liquid storage tank (16) in the cooling cavity (3) through the circulating pipe (15), so that the casting cavity (10) is slowly cooled;

s5: further, the motor is started, so that the motor drives the threaded rod (26) to rotate, the movable plate (28) is lifted on the threaded rod (26), and the gear (29) is driven to lift on the rack plate (23);

s6: and finally, driving an ejector rod (24) and a top plate (25) to lift and slide in the bearing plate through a motor, and ejecting the cast after casting.

Technical Field

The invention relates to the technical field of low-pressure casting, in particular to a low-pressure casting device for producing an aluminum alloy control arm and a using method thereof.

Background

Low-pressure casting was the earliest countergravity casting technology, beginning to be used in industrial production in the 40 th century; nowadays, low-pressure casting is mainly used for producing aluminum alloy and magnesium alloy parts, such as automobile hubs in the automobile industry, cylinder bodies of internal combustion engines, cylinder covers, pistons, missile shells, impellers, air guide wheels and other castings with complex shapes and high quality requirements; when low-pressure casting is adopted to produce cast steel, such as cast steel wheels, the riser tube is made of special refractory materials; low pressure casting may also be applied to small copper alloy castings such as plumbing joints, faucet taps in bathrooms, and the like.

When the temperature is too high or too low, the casting is easy to crack or cold crack, so that cracks are generated in the casting and the solidified part of the casting has holes, and the integrity of the casting is influenced.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a low-pressure casting device for producing an aluminum alloy control arm and a using method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a low pressure casting device for production of aluminum alloy control arm, including the supporting seat, the top outer wall of supporting seat is provided with four bracing pieces, the top outer wall of four bracing pieces is provided with same fixed plate, the bottom outer wall of fixed plate is provided with the cylinder, one side outer wall of cylinder is provided with the stripper plate, stripper plate and four bracing piece sliding connection, one side outer wall of supporting seat is provided with the controller, the bottom inner wall of supporting seat is provided with the crucible, the top of crucible is provided with casting mold mechanism, one side outer wall of supporting seat is provided with two chamber doors, one side of casting mold mechanism is provided with cooling body, one side outer wall of supporting seat is provided with the heat dissipation fan.

Preferably: the casting mold mechanism comprises a mold core, a mold cavity and an ejection assembly, a fixed seat is arranged on the outer wall of the bottom of the fixed plate, the mold core is arranged on the outer wall of the bottom of the fixed seat, the mold cavity is arranged on the outer wall of the top of the supporting seat, and a compressor is arranged on the outer wall of one side of the supporting seat.

Further: the gas outlet of the compressor is provided with a gas delivery pipe, a liquid lifting pipe is arranged inside the crucible, the casting cavity is connected with the crucible through the liquid lifting pipe, the outer wall of one side of the crucible is provided with a connecting pipe, the outer wall of one side of the connecting pipe is provided with a pressure release valve, the ejection assembly is arranged on the inner wall of the bottom of the casting cavity, and the wall thickness of the upper part of the casting cavity is larger than that of the lower part of the casting cavity.

On the basis of the scheme: the ejection assembly comprises more than three rack plates, a threaded rod and a movable plate, a protective shell is arranged on the inner wall of the bottom of the casting cavity, a motor is arranged in the protective shell, one end of the threaded rod is arranged at the output end of the motor, the movable plate is arranged on the outer wall of the circumference of the threaded rod, more than three mounting grooves are formed in the outer wall of one side of the movable plate, and a gear is rotatably connected in each mounting groove.

The better scheme in the scheme is as follows: every the rack board all sets up on the bottom inner wall of die cavity, every rack board all with every gear engagement transmission, the top outer wall of fly leaf is provided with ejector pin more than three, the top outer wall of every ejector pin all is provided with the roof, one side inner wall of die cavity is provided with the bearing plate, the bearing plate is connected with the stalk, every roof all with bearing plate sliding connection.

As a further scheme of the invention: the cooling mechanism comprises a circulating pump, a cooling cavity and a liquid storage tank, the circulating pump is arranged on the outer wall of the top of the supporting seat, the cooling cavity is arranged on the outer wall of the circumference of the casting cavity, the liquid storage tank is arranged on the outer wall of the top, close to the circulating pump, of the supporting seat, circulating pipes are arranged at the water outlet and the water inlet of the circulating pump, the other end of each circulating pipe is connected with the liquid storage tank, and the outer wall of one side of one circulating pipe is annular and connected with.

As a further scheme of the invention: the top outer wall of crucible is provided with the closing plate, is provided with the rubber pad between crucible and the closing plate, and the top outer wall of closing plate is provided with more than three locating pin, and the access hole has been seted up to the top outer wall of crucible, and the one end of stalk is provided with solid fixed ring.

As a preferable aspect of the present invention: the outer wall of one side of the fixing ring is provided with a filter, the filter is in a conical shape with a large upper part and a small lower part, the outer wall of the top of the crucible is provided with a vacuum pump, and the vacuum pump is connected with the casting cavity through an exhaust pipe.

A method of using a low pressure casting apparatus for the production of aluminum alloy control arms, comprising the steps of:

s1: firstly, starting a compressor, so that the compressor conveys compressed gas into a crucible through a gas conveying pipe and a connecting pipe, and the metal liquid in the crucible is conveyed into a casting cavity through a liquid lifting pipe under the action of pressure difference;

s2: then, driving a core to extrude the casting cavity through an air cylinder, and further performing casting operation;

s3: starting a vacuum pump, so that the vacuum pump pumps the casting cavity to a vacuum state through an exhaust pipe, and degassing the casting cavity;

s4: after casting, starting a circulating pump, and enabling the circulating pump to circularly convey cooling liquid in a liquid storage tank in a cooling cavity through a circulating pipe, so that the casting cavity is slowly cooled;

s5: then, starting the motor, so that the motor drives the threaded rod to rotate, the movable plate is lifted on the threaded rod, and the gear is driven to lift on the rack plate;

s6: and finally, driving the ejector rod and the top plate to lift and slide in the bearing plate through a motor, and ejecting the cast after casting.

The invention has the beneficial effects that:

1. according to the low-pressure casting device for producing the aluminum alloy control arm and the using method thereof, the circulating pump is started to circularly convey the cooling liquid in the liquid storage tank in the cooling cavity through the circulating pipe, so that the casting cavity is slowly cooled, and the phenomenon that cracks and air holes are generated on the surface of a casting mould casting due to the fact that the cooling speed is too high to influence the using effect of the casting mould casting is avoided.

2. This a low pressure casting device for production of aluminum alloy control arm and application method thereof, through starting the compressor, make the compressor carry compressed gas to the crucible in through gas-supply pipe and connecting pipe, thereby make the metal liquid in the crucible carry to the casting mould intracavity through the stalk under the effect of pressure differential, extrude the casting mould cavity through the core, and then carry out casting mould work, carry out the pressure release when the pressure is too big in the crucible through the relief valve, prevent the running fire, upper portion wall thickness through the casting mould cavity is greater than the lower part wall thickness, make the thermal capacity distribute rationally, prevent the shrinkage cavity phenomenon from appearing in the casting mould process.

3. According to the low-pressure casting device for producing the aluminum alloy control arm and the using method of the low-pressure casting device, the motor drives the threaded rod to rotate by starting the motor, the movable plate is made to ascend and descend on the threaded rod, the gear is driven to ascend and descend on the rack plate at the same time, the movable plate is made to be more stable when height adjustment is conducted, inclination is prevented, the ejector rod and the top plate are driven to ascend and descend in the bearing plate, and ejection work is conducted on castings after casting molds.

4. According to the low-pressure casting device for producing the aluminum alloy control arm and the using method thereof, the vacuum pump is started to pump the casting cavity into a vacuum state through the exhaust pipe, so that the casting cavity is degassed, the casting of the casting is prevented from having air holes, the scum on the surface of the molten metal is filtered through the filter which is in a cone shape with the upper part being large and the lower part being small, and meanwhile, the phenomenon that the flow rate of the molten metal in the lift pipe is too large, the filling speed is high, and the scum and the air holes are mixed after the casting of the casting cavity is carried out is prevented.

Drawings

FIG. 1 is a schematic front view of a low pressure casting apparatus for aluminum alloy control arm production according to the present invention;

FIG. 2 is a schematic rear view of a low pressure casting apparatus for aluminum alloy control arm production according to the present invention;

FIG. 3 is a schematic structural diagram of a crucible in a low-pressure casting device for producing an aluminum alloy control arm, which is provided by the invention;

FIG. 4 is a schematic sectional view of a mold in a low-pressure casting apparatus for producing an aluminum alloy control arm according to the present invention;

FIG. 5 is a schematic structural diagram of an ejection mechanism in a low-pressure casting device for producing an aluminum alloy control arm according to the present invention;

FIG. 6 is a schematic cross-sectional view of a crucible in a low-pressure casting apparatus for aluminum alloy control arm production according to the present invention.

In the figure: the device comprises a supporting seat 1, a circulating pump 2, a cooling cavity 3, a supporting rod 4, an extrusion plate 5, a fixing plate 6, a cylinder 7, a fixing seat 8, a core 9, a casting cavity 10, a controller 11, a box door 12, a compressor 13, a gas pipe 14, a circulating pipe 15, a liquid storage tank 16, a heat dissipation fan 17, a connecting pipe 18, a pressure release valve 19, a vacuum pump 20, a positioning pin 21, a crucible 22, a rack plate 23, a push rod 24, a top plate 25, a threaded rod 26, a protective shell 27, a movable plate 28, a gear 29, a filter 30, an access hole 31, a sealing plate 32, a rubber pad 33, a liquid lifting pipe 34 and a fixing ring 35.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Example 1:

a low-pressure casting device for producing an aluminum alloy control arm is shown in figures 1-5 and comprises a supporting seat 1, wherein four supporting rods 4 are arranged on the outer wall of the top of the supporting seat 1, a same fixing plate 6 is arranged on the outer wall of the top of each supporting rod 4, an air cylinder 7 is arranged on the outer wall of the bottom of the fixing plate 6, an extrusion plate 5 is arranged on the outer wall of one side of the air cylinder 7, the extrusion plate 5 is in sliding connection with the four supporting rods 4, a controller 11 is arranged on the outer wall of one side of the supporting seat 1, a crucible 22 is arranged on the inner wall of the bottom of the supporting seat 1, a casting mold mechanism is arranged at the top of the crucible 22, two box doors 12 are hinged to the outer wall of one side of the supporting seat 1 through hinges, a cooling mechanism is arranged on one side of the casting mold mechanism, and a heat dissipation fan 17 is arranged on the outer wall of one side of the supporting seat 1; drive stripper plate 5 through cylinder 7 and go up and down for stripper plate 5's height-adjustable, thereby carry out casting mould work, carry out spacingly through four bracing pieces 4 to stripper plate 5's movement track, carry out casting mould work to it through casting mould mechanism, cool off the foundry goods behind the casting mould through cooling body, prevent that the high temperature from making its production crack, the gas pocket appears.

In order to carry out the casting work; as shown in fig. 1, 2, 3, 4 and 5, the casting mold mechanism includes a core 9, a mold cavity 10 and an ejection assembly, a fixed seat 8 is provided on the outer wall of the bottom of a fixed plate 6, the core 9 is fixed on the outer wall of the bottom of the fixed seat 8 through a bolt, the mold cavity 10 is fixed on the outer wall of the top of the support seat 1 through a bolt, a compressor 13 is provided on the outer wall of one side of the support seat 1, an air pipe 14 is provided at an air outlet of the compressor 13, a lift pipe 34 is provided inside the crucible 22, the mold cavity 10 is connected with the crucible 22 through the lift pipe 34, a connecting pipe 18 is provided on the outer wall of one side of the crucible 22, a relief valve 19 is provided on the outer wall of one side of the connecting pipe 18, the ejection assembly is provided on the inner wall of the bottom of the mold cavity 10, and the upper wall thickness of the mold cavity 10 is greater than the lower wall thickness; through starting compressor 13, make compressor 13 carry compressed gas to crucible 22 in through gas-supply pipe 14 and connecting pipe 18, thereby make the metal liquid in crucible 22 carry to the casting die cavity 10 in through stalk 34 under the effect of pressure differential, extrude casting die cavity 10 through core 9, and then carry out casting mould work, carry out the pressure release when crucible 22 internal pressure is too big through relief valve 19, prevent the running fire, upper portion wall thickness through casting die cavity 10 is greater than the lower part wall thickness, make heat capacity reasonable in distribution, prevent the shrinkage cavity phenomenon from appearing in the casting mould process.

In order to eject the cast after casting; as shown in fig. 4 and 5, the ejection assembly includes three or more rack plates 23, the mold comprises a threaded rod 26 and a movable plate 28, wherein a protective shell 27 is arranged on the inner wall of the bottom of the mold cavity 10, a motor is arranged in the protective shell 27, one end of the threaded rod 26 is fixed at the output end of the motor through a rotating shaft, the movable plate 28 is fixed on the outer wall of the circumference of the threaded rod 26 through threads, more than three mounting grooves are formed in the outer wall of one side of the movable plate 28, a gear 29 is rotatably connected in each mounting groove, each rack plate 23 is arranged on the inner wall of the bottom of the mold cavity 10, each rack plate 23 is in meshed transmission with each gear 29, more than three ejector rods 24 are arranged on the outer wall of the top of the movable plate 28, a top plate 25 is arranged on the outer wall of the top of each ejector rod 24, a bearing plate is arranged on the inner wall of one side of the mold cavity 10, the bearing plate is connected with a liquid lifting pipe 34, and each top plate 25 is in sliding connection with the bearing plate; through the starting motor, the motor drives the threaded rod 26 to rotate, the movable plate 28 is lifted on the threaded rod 26, and the gear 29 is driven to lift on the rack plate 23, so that the movable plate 28 is more stable in height adjustment, is prevented from inclining, and drives the ejector rod 24 and the top plate 25 to lift and slide in the bearing plate, and the cast after casting is ejected.

For cooling the casting; as shown in fig. 1 and 2, the cooling mechanism comprises a circulating pump 2, a cooling cavity 3 and a liquid storage tank 16, the circulating pump 2 is fixed on the outer wall of the top of the supporting seat 1 through bolts, the cooling cavity 3 is arranged on the outer wall of the circumference of the casting cavity 10, the liquid storage tank 16 is arranged on the outer wall of the top of the supporting seat 1 close to the circulating pump 2, a water outlet and a water inlet of the circulating pump 2 are both provided with circulating pipes 15, the other end of each circulating pipe 15 is connected with the liquid storage tank 16, and the outer wall of one side of one circulating pipe 15 is connected with the cooling cavity 3 in a ring shape; by starting the circulating pump 2, the circulating pump 2 circularly conveys the cooling liquid in the liquid storage tank 16 in the cooling cavity 3 through the circulating pipe 15, so that the casting cavity 10 is slowly cooled, and the phenomenon that the surface of a casting mold casting is cracked and air holes due to the excessively high cooling speed are prevented, and the using effect of the casting mold casting is influenced.

In the embodiment, when the device is used, the compressor 13 is started, so that the compressor 13 conveys compressed gas into the crucible 22 through the gas conveying pipe 14 and the connecting pipe 18, the metal liquid in the crucible 22 is conveyed into the casting cavity 10 through the lift pipe 34 under the action of pressure difference, the casting cavity 10 is extruded through the core 9, casting work is performed, the circulating pump 2 is started, the cooling liquid in the liquid storage tank 16 is circularly conveyed in the cooling cavity 3 through the circulating pipe 15 by the circulating pump 2, the casting cavity 10 is slowly cooled, the motor is started, the motor drives the threaded rod 26 to rotate, the movable plate 28 is lifted on the threaded rod 26, the gear 29 is driven to lift on the rack plate 23, the movable plate 28 is more stable during height adjustment, inclination is prevented, and the ejector rod 24 and the ejector plate 25 are driven to lift and slide in the bearing plate, and ejecting the cast after casting.

Example 2:

a low-pressure casting device for producing an aluminum alloy control arm is disclosed, as shown in FIGS. 5 and 6, in order to arrange a sealing plate 32 on the outer wall of the top of a crucible 22, a rubber pad 33 is arranged between the crucible 22 and the sealing plate 32, more than three positioning pins 21 are arranged on the outer wall of the top of the sealing plate 32, an access hole 31 is arranged on the outer wall of the top of the crucible 22, a fixing ring 35 is arranged at one end of a riser tube 34, a filter 30 is fixed on the outer wall of one side of the fixing ring 35 through a bearing, the filter 30 is in a conical shape with a large upper part and a small lower part, a vacuum pump 20 is arranged on the outer wall of the top of the crucible 22, and the vacuum pump 20 is connected with a casting cavity 10 through a suction pipe; by starting the vacuum pump 20, the vacuum pump 20 pumps the casting cavity 10 to a vacuum state through the exhaust pipe, so that degassing is performed on the casting cavity, air holes are prevented from existing in the casting, scum on the surface of the molten metal is filtered through the filter 30 which is in a conical shape with a large top and a small bottom, and meanwhile, the phenomenon that the flow speed of the molten metal in the lift pipe 34 is too large, the casting is filled quickly, and the scum and the air holes are mixed after the casting is performed.

In use, the vacuum pump 20 is activated such that the vacuum pump 20 evacuates the mold cavity 10 to a vacuum through the extraction tube, thereby degassing the same.

Example 3:

a method of using a low pressure casting apparatus for the production of aluminum alloy control arms, comprising the steps of:

s1: firstly, starting the compressor 13, so that the compressor 13 conveys compressed gas into the crucible 22 through the gas conveying pipe 14 and the connecting pipe 18, and the metal liquid in the crucible 22 is conveyed into the casting cavity 10 through the riser pipe 34 under the action of pressure difference;

s2: then, the cylinder 7 drives the core 9 to extrude the casting cavity 10, and then casting is carried out;

s3: next, the vacuum pump 20 is started, so that the vacuum pump 20 pumps the interior of the mold cavity 10 to a vacuum state through the exhaust pipe, thereby degassing the same;

s4: after casting, starting the circulating pump 2, so that the circulating pump 2 circularly conveys the cooling liquid in the liquid storage tank 16 in the cooling cavity 3 through the circulating pipe 15, and slowly cooling the casting cavity 10;

s5: further, the motor is started, so that the motor drives the threaded rod 26 to rotate, the movable plate 28 is lifted on the threaded rod 26, and the gear 29 is driven to lift on the rack plate 23;

s6: and finally, driving the ejector rod 24 and the top plate 25 to lift and slide in the bearing plate through a motor, and ejecting the cast after casting.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.