Automated Die Casting Device and Die Casting Method for Aluminum Housing of an Automotive Liquid Receiver Dryer

Abstract

An automatic die-casting device and die-casting method for an aluminum housing of an automotive liquid storage dryer disclosed by the present invention. Among them, the die-casting device includes a lower die and an upper die that can form a die cavity with the lower die. A heat preservation furnace is arranged at the bottom of the lower die. There is a liquid injection port in the lower die for the molten metal to enter the cavity. A lifting pipe with its top end communicating with the liquid injection port is arranged in the heat preservation furnace. A valve member linked with the upper die is arranged between the lifting pipe and the liquid injection port. The valve member has a gate that can be closed. Both ends of the gate are respectively communicated with the lifting pipe and the liquid injection port. After the die is closed, the gate is opened, and after the die is opened, the gate is closed. By arranging a valve member linked with the upper die between the lifting pipe and the lower die, when the die is closed, the valve member connects the lifting pipe and the valve cavity, and when the die is opened, the valve member is closed, solving the problem that air enters the lifting pipe and causes an oxide film to appear on the liquid level of the molten metal in the lifting pipe.

Description

Technical Field

[0001] The present invention relates to the field of casting technology, and more particularly to an automatic die-casting device and die-casting method for an aluminum shell of an automotive liquid storage dryer. Background Art

[0002] Low-pressure casting is a method of forming castings by filling the mold cavity with liquid metal under pressure. The process of low-pressure casting is as follows: Dry compressed air is introduced into a closed heat-insulating furnace. The molten metal in the heat-insulating furnace rises along the riser pipe under the gas pressure, enters the mold cavity through the gate, and the gas pressure in the heat-insulating furnace is maintained until the molten metal in the mold cavity is completely solidified to form a casting. Then, the pressure in the heat-insulating furnace is released, so that the molten metal in the riser pipe that has not solidified flows back into the heat-insulating furnace. Next, the pressure of the pressing device at the top of the mold is released, and the casting is taken out.

[0003] After the casting is taken out, the riser pipe communicates with the air through the mold cavity, and air will enter the riser pipe and come into contact with the molten metal in the riser pipe. At high temperatures, the molten metal is extremely likely to undergo an oxidation reaction with oxygen. A layer of oxide film will form on the surface of the molten metal, and this oxide film may affect the fluidity of the molten metal and the quality of the casting during subsequent casting processes. The oxide film or oxide may be carried into the mold cavity, resulting in defects such as inclusions and pores on the surface of the casting, affecting the mechanical properties and appearance quality of the casting. The oxide film or oxide may accumulate on the inner wall of the riser pipe, gradually causing the riser pipe to become blocked and affecting the normal flow of the molten metal. The oxidized molten metal may not be reusable, causing waste of the molten metal. The oxidation of the molten metal will change its fluidity and filling performance, resulting in unstable casting processes and affecting the consistency of the castings. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, an automatic die-casting device and die-casting method for an aluminum shell of an automotive liquid storage dryer are provided. By providing a valve member linked with the upper mold between the riser pipe and the lower mold, when the mold is closed, the valve member connects the riser pipe and the valve cavity, and when the mold is opened, the valve member is closed, solving the problem that air enters the riser pipe and causes an oxide film to appear on the liquid surface of the molten metal in the riser pipe.

[0005] In order to solve the problems of the prior art, the present invention provides an automated die-casting device for an aluminum shell of an automobile liquid storage dryer, comprising a lower mold and an upper mold capable of forming a mold cavity with the lower mold, a heat preservation furnace is arranged at the bottom of the lower mold, a liquid injection port for metal liquid to enter the cavity is arranged in the lower mold, a liquid riser is arranged at the top end of the liquid riser connected with the liquid injection port, a valve member linked to the upper mold is arranged between the liquid riser and the liquid injection port, the valve member has a closable gate, both ends of the gate are respectively connected with the liquid riser and the liquid injection port, the gate is opened after the mold is closed, and the gate is closed after the mold is separated; the gate has fixed channels distributed along the circumference of the liquid riser and a movable channel capable of conducting with the fixed channels, when the movable channel is in a connected state with the fixed channel, the gate is opened; when the movable channel is in a non-connected state with the fixed channel, the gate is closed.

[0006] Preferably, the fixed channel and the movable channel both extend in a direction parallel to the axis of the riser tube, and the molten metal passes through the fixed channel and the movable channel in sequence from the riser tube and then enters the mold cavity.

[0007] Preferably, the valve component includes a fixed seat and a movable seat, the fixed seat is fixedly arranged at the top of the rising tube, the fixed channel is distributed in the fixed seat, the movable seat is rotatably arranged at the top of the fixed seat and forms a linkage with the upper mold, and the movable channel is distributed on the movable seat; when the upper mold and the lower mold are separated, the movable seat rotates relative to the fixed seat to make the movable channel and the fixed channel staggered.

[0008] Preferably, the fixed seat has a lower recess extending into the riser tube, the fixed channel is distributed in the lower recess along the circumference of the riser tube, the movable seat has an upper recess extending into the inner cavity of the lower recess and loosely matched therewith, and the movable channel is distributed in the upper recess along the circumference of the riser tube.

[0009] Preferably, a linkage assembly for linking the upper mold and the movable seat is provided in the lower mold, and the linkage assembly includes a trigger member arranged at the top of the upper mold and capable of abutting against the upper mold, and an actuator arranged at the bottom of the upper mold and transmission connected to the movable seat. When the upper mold abuts against the trigger member and the mold is closed, the actuator can drive the movable seat to rotate on the fixed seat to connect the fixed channel and the movable channel.

[0010] Preferably, the trigger member includes a trigger rod which slides longitudinally through the lower mold, the trigger rod is elastically connected to the lower mold, and in an initial state, the top end of the trigger rod is higher than the mating surface of the lower mold; the actuator includes an actuator ring which is slidably arranged at the bottom of the lower mold along the axial direction of the liquid lifting tube, and the trigger rod is connected to the actuator ring; the inner periphery of the actuator ring is provided with an actuator cylinder extending downward, and the actuator cylinder is provided with an arc-shaped driving groove coaxial with the actuator cylinder, and the outer circumferential surface of the movable member is provided with a guide pin which slides with the arc-shaped driving groove.

[0011] Preferably, a conduction pipe extending downward into the upper concave portion is provided at the bottom end of the liquid injection port. A sealing ring coaxial with the conduction pipe is provided on the outer circumferential surface of the conduction pipe, and the sealing ring abuts against the top end of the movable seat.

[0012] Preferably, a ejector rod sliding vertically through the lower die is further provided in the lower die. In the mold-closing state, the top end of the ejector rod is flush with the cavity. In the mold-opening state, the execution ring abuts against the ejector rod and makes the top end of the ejector rod higher than the bottom surface of the cavity.

[0013] An automatic die-casting method for an aluminum shell of an automotive liquid storage dryer, using an automatic die-casting device for an aluminum shell of an automotive liquid storage dryer, includes the following steps:

[0014] Step 1, after the upper die and the lower die are closed, the valve passage of the valve component conducts the lifting pipe and the cavity;

[0015] Step 2, inject gas into the holding furnace, the molten metal in the lifting pipe rises and fills the cavity, and maintain the air pressure in the holding furnace until the molten metal in the cavity is completely solidified to form a casting;

[0016] Step 3, relieve the pressure in the holding furnace, the non-solidified molten metal in the lifting pipe flows back to the holding furnace, after mold opening, the valve passage of the valve component is closed, and the casting is taken out.

[0017] The beneficial effects of this application compared with the prior art are:

[0018] In this application, by arranging a valve component linked with the upper die between the lifting pipe and the lower die, the connection state between the lifting pipe and the valve cavity is precisely controlled, thus solving the problem of the formation of an oxide film on the liquid surface of the molten metal due to air entering the lifting pipe. During the mold-closing process, the valve component is automatically opened through a linkage assembly connected to the upper die in a driving manner, ensuring the smooth passage between the lifting pipe and the valve cavity and allowing the molten metal to flow into the cavity smoothly; while during mold opening, the valve component closes the gate channel, cutting off the connection between the lifting pipe and the valve cavity, effectively preventing external air from entering the lifting pipe, thereby avoiding the oxidation phenomenon caused by the exposure of the molten metal surface to the air. The surface quality of the aluminum liquid is significantly improved, the problem of affecting the casting quality due to the formation of an oxide film is avoided, and the stability and fluidity of the molten metal during the casting process are ensured.

[0019] In this application, by using the combination of a fixed channel and a movable channel, the larger metal slag in the molten metal is effectively prevented from entering the cavity along with the molten metal, thereby ensuring the casting quality, avoiding casting defects such as holes and inclusions caused by the mixing of metal slag, and ensuring the internal structure uniformity and surface quality of the casting.

[0020] In this application, both the fixed channel and the movable channel extend along a direction parallel to the axis of the liquid-lifting pipe. The molten metal sequentially passes through the fixed channel and the movable channel from the liquid-lifting pipe and then enters the cavity. This can reduce the sudden change in the flow direction. In this case, the molten metal will not generate large velocity gradients and direction changes due to the sharp change in the channel direction, thereby effectively reducing the probability of turbulent flow generation. This enables the molten metal to fill the cavity smoothly and improves the quality of the casting. Description of the Drawings

[0021] Figure 1 is a perspective view of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0022] Figure 2 is a perspective sectional view of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0023] Figure 3 is a sectional view of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0024] Figure 4 is Figure 3 a partial enlarged view of part A of

[0025] Figure 5 is a perspective view of the lower die of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0026] Figure 6 is a perspective view of the linkage assembly of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0027] Figure 7 is a perspective view of the conduction pipe of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0028] Figure 8 is an exploded perspective view of the valve member of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0029] Figure 9 is a perspective view of the trigger member of an automatic die-casting device for the aluminum housing of an automotive liquid storage dryer according to the present invention.

[0030] Figure 10 is a perspective view of the aluminum housing of the automotive liquid storage dryer.

[0031] The reference numerals in the figure are: 1, lower die; 11, liquid injection port; 12, conduction pipe; 121, sealing ring; 13, ejector rod; 131, positioning ring; 14, lower elastic element; 2, upper die; 3, valve member; 31, fixed seat; 311, fixed channel; 32, movable seat; 321, movable channel; 322, arc-shaped positioning groove; 4, heat preservation furnace; 5, riser pipe; 51, flange ring; 52, connecting pin; 61, frame; 62, fixed die seat; 63, movable die seat; 64, hydraulic cylinder; 71, trigger rod; 72, limit ring; 73, upper elastic element; 74, execution ring; 741, execution cylinder; 742, arc-shaped driving groove; 75, guide pin. Specific embodiments

[0032] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Figure 10 Shown is a three-dimensional view of the aluminum shell of an automotive liquid storage dryer to be processed. As Figure 1 , Figure 2 and Figure 3 shown, this embodiment provides an automatic die-casting device for the aluminum shell of an automotive liquid storage dryer, including a lower die 1 and an upper die 2 that can form a mold cavity with the lower die 1. A heat preservation furnace 4 is provided at the bottom of the lower die 1. The lower die 1 has a liquid injection port 11 for molten metal to enter the cavity. A riser pipe 5 with its top end communicating with the liquid injection port 11 is provided in the heat preservation furnace 4. A valve member 3 linked with the upper die 2 is provided between the riser pipe 5 and the liquid injection port 11. The valve member 3 has a gate that can be closed. The two ends of the gate are respectively communicated with the riser pipe 5 and the liquid injection port 11. After mold closing, the gate is opened, and after mold opening, the gate is closed.

[0034] It also includes a frame 61 and a fixed die seat 62 and a movable die seat 63 provided on the frame 61. The lower die 1 is fixedly provided on the fixed die seat 62. The heat preservation furnace 4 is provided at the bottom of the fixed die seat 62. The upper die 2 is provided at the bottom end of the movable die seat 63. A hydraulic cylinder 64 is provided at the top end of the frame 61. The output rod of the hydraulic cylinder 64 is fixedly connected to the movable die seat 63. The hydraulic cylinder 64 drives the movable die seat 63 to move up and down to realize the mold closing and mold opening operations of the mold. The hydraulic system adopts closed-loop control to ensure the precise adjustment of the mold closing force and mold opening speed to meet different process requirements.

[0035] In the mold closed state, the gate is opened, and the molten metal enters the mold cavity through the riser pipe 5 and the liquid injection port 11; in the mold opened state, the gate is closed, effectively blocking the entry of external air into the riser pipe 5 and preventing the formation of an oxide film on the liquid surface of the molten metal in the riser pipe 5.

[0036] By setting the valve member 3 to control the communication and closing of the riser pipe 5 and the liquid injection port 11, the entry of air into the riser pipe 5 is effectively prevented.

[0037] As Figure 4 and Figure 8 shown, the gate has fixed channels 311 circumferentially distributed along the riser 5 and movable channels 321 that can communicate with the fixed channels 311. When the movable channels 321 are in communication with the fixed channels 311, the gate is opened; when the movable channels 321 are not in communication with the fixed channels 311, the gate is closed.

[0038] The gate system consists of fixed channels 311 evenly distributed circumferentially along the riser 5 and movable channels 321 that can establish a conductive relationship with the fixed channels 311. When the movable channels 321 are in communication with the fixed channels 311, the gate is opened, and the molten metal can flow from the riser 5 into the cavity through this communication path. In this working mode, through the passage formed by the fixed channels 311 and the movable channels 321, the molten metal enters the cavity orderly under the action of gravity or external pressure.

[0039] When the movable channels 321 are not in communication with the fixed channels 311, the gate is closed, blocking air from entering the riser 5 to oxidize the molten metal in the riser 5. By using the combination of the fixed channels 311 and the movable channels 321, large metal slag in the molten metal can be effectively prevented from entering the cavity along with the molten metal.

[0040] As Figure 8 shown, both the fixed channels 311 and the movable channels 321 extend along a direction parallel to the axis of the riser 5, and the molten metal passes through the fixed channels 311 and the movable channels 321 in sequence from the riser 5 and then enters the cavity.

[0041] When the molten metal flows in the riser 5, the fixed channels 311 and the movable channels 321 extending along the direction parallel to the axis of the riser 5 can make the molten metal transition more smoothly. If the direction of the channels is consistent with the initial flow direction of the molten metal, the sudden change in the flow direction can be reduced. In this case, the molten metal will not generate large velocity gradients and direction changes due to the sharp change in the channel direction, thereby effectively reducing the probability of generating turbulence. Turbulence will cause the internal particles of the molten metal to collide and mix with each other, consume energy and may entrain gas, while this parallel design can make the molten metal flow in a more laminar state, which helps to stabilize the flow rate.

[0042] For example, in the process of low-pressure casting, turbulence is likely to cause the molten metal to generate vortices in the cavity, entraining air to form porosity defects. And stable laminar flow can make the molten metal fill the cavity smoothly, improving the quality of the casting.

[0043] The parallel arrangement of the fixed channel 311 and the movable channel 321 with the axis of the liquid-lifting pipe 5 makes the flow path of the molten metal relatively regular. When the flow path of the molten metal is regular, the change in flow velocity is relatively stable, and the pressure fluctuation will also decrease accordingly.

[0044] As Figure 4 and Figure 8 shown, the valve member 3 includes a fixed seat 31 and a movable seat 32. The fixed seat 31 is fixedly arranged at the top end of the liquid-lifting pipe 5, and the fixed channels 311 are distributed in the fixed seat 31. The movable seat 32 is rotatably arranged at the top end of the fixed seat 31 and is linked with the upper mold 2. The movable channels 321 are distributed on the movable seat 32. When the upper mold 2 and the lower mold 1 are separated, the movable seat 32 rotates relative to the fixed seat 31 so that the movable channels 321 are staggered with the fixed channels 311.

[0045] The valve member 3 is mainly composed of a fixed seat 31 and a movable seat 32. Among them, the fixed seat 31 is installed at the top part of the liquid-lifting pipe 5 in a stable manner, and the fixed channels 311 are regularly distributed in the internal structure of the fixed seat 31. The movable seat 32 is rotatably arranged at the top end of the fixed seat 31 and builds a linkage mechanism with the upper mold 2, and the movable channels 321 are orderly distributed on the movable seat 32.

[0046] When the upper mold 2 and the lower mold 1 are in the working condition of mold separation, the movable seat 32 will rotate relative to the fixed seat 31. This rotation process makes the movable channels 321 and the fixed channels 311 form a staggered state in the spatial position, thereby changing the connection state of the fluid channels.

[0047] When the upper mold 2 and the lower mold 1 are in the working condition of mold closing, the movable seat 32 will rotate relative to the fixed seat 31. This rotation process makes the movable channels 321 and the fixed channels 311 communicate in the spatial position, thereby changing the connection state of the fluid channels.

[0048] As Figure 4 shown, the fixed seat 31 has a concave portion extending into the liquid-lifting pipe 5, and the fixed channels 311 are distributed along the circumferential direction of the liquid-lifting pipe 5 in the concave portion. The movable seat 32 has a concave portion extending into the inner cavity of the concave portion and having a clearance fit with it, and the movable channels 321 are distributed along the circumferential direction of the liquid-lifting pipe 5 in the concave portion.

[0049] The fixing seat 31 has a concave portion extending downward and penetrating into the internal space of the riser tube 5. The concave portion forms a concave area of a certain depth in the axial direction of the riser tube 5, providing a spatial structure for the convergence and transmission of the fluid. The fixed channels 311 are distributed in the internal structure of the concave portion in a uniform and orderly layout according to the circumferential direction of the riser tube 5. It is ensured that when the fluid flows out from the inside of the riser tube 5, a uniform and stable diversion effect can be achieved through the fixed channels 311, thereby providing stable fluid input conditions for subsequent process.

[0050] The movable seat 32 correspondingly has an upper recessed portion that is recessed upward and extends into the inner cavity of the lower recessed portion, and a clearance fit relationship is established between the upper recessed portion and the lower recessed portion. This intermittent fit can ensure the relative freedom of movement between the two when the movable seat 32 performs a specific movement, and ensure that a certain sealing performance is maintained in the fitting area to prevent fluid leakage. The movable channels 321 are also reasonably and regularly distributed in the upper recessed portion according to the circumferential direction of the riser 5. This distribution method echoes the layout of the fixed channels 311. When the movable seat 32 and the fixed seat 31 undergo relative movement, the relative position change between the movable channels 321 and the fixed channels 311 can accurately control the conduction and blocking states of the fluid channel, thereby achieving precise regulation of the fluid flow rate and flow direction.

[0051] like Figure 5 , Figure 6 , Figure 7 , Figure 9 As shown, a linkage assembly for linking the upper mold 2 and the movable seat 32 is provided in the lower mold 1, and the linkage assembly includes a trigger member arranged at the top of the upper mold 2 and capable of abutting against the upper mold 2, and an actuator arranged at the bottom of the upper mold 2 and transmission connected to the movable seat 32. When the upper mold 2 abuts against the trigger member and the molds are closed, the actuator can drive the movable seat 32 to rotate on the fixed seat 31 to connect the fixed channel 311 and the movable channel 321.

[0052] The trigger is set at the top of the upper mold 2, and its structural design ensures that it can form a close and reliable abutment relationship with the corresponding part of the upper mold 2. During the mechanical movement process, the trigger can cooperate with the upper mold 2 when the mold is closed. When the mold closing process is started, the upper mold 2 moves down along the predetermined motion trajectory and abuts against the trigger, and the trigger can drive the mechanical instructions of the actuator to move.

[0053] The actuator is arranged at the bottom of the upper mold 2 and establishes a stable transmission connection with the movable seat 32. When the actuator receives power from the trigger, it drives the movable seat 32 to rotate on the fixed seat 31. As the movable seat 32 rotates, the movable channels 321 distributed thereon gradually approach and finally communicate with the fixed channels 311 on the fixed seat 31 in spatial position, thereby providing an unobstructed flow path for the subsequent process fluid and meeting the strict requirements for the fluid conduction state in the process.

[0054] As Figure 4 and Figure 9 shown, the trigger includes a trigger rod 71 that longitudinally slides through the lower mold 1. The trigger rod 71 is elastically connected to the lower mold 1. In the initial state, the top end of the trigger rod 71 is higher than the mold closing surface of the lower mold 1. The actuator includes an actuator ring 74 that axially slides at the bottom of the lower mold 1 along the liquid-rising pipe 5. The trigger rod 71 is connected to the actuator ring 74. An actuator cylinder 741 extending downward is provided on the inner circumference of the actuator ring 74. An arc-shaped driving groove 742 coaxial with it is provided on the actuator cylinder 741. A guide pin 75 that slidably cooperates with the arc-shaped driving groove 742 is provided on the outer circumferential surface of the movable part.

[0055] An upper blind hole extending in the vertical direction is provided at the top end of the lower mold 1. The top end of the trigger rod 71 extends into the upper blind hole and is provided with a limit ring 72. An upper elastic element 73 is provided between the limit ring 72 and the bottom end of the upper blind hole.

[0056] When the mold closing process is started, the upper mold 2 follows a preset movement trajectory and approaches the lower mold 1 vertically downward at a constant speed. During this process, the bottom end of the upper mold 2 abuts against the top end of the trigger rod 71. As the upper mold 2 continues to descend, the trigger rod 71 begins to overcome the elastic restoring force exerted by the upper elastic element 73. The upper elastic element 73 ensures that the trigger rod 71 stably maintains the position where its top end is higher than the mold closing surface of the lower mold 1 in the initial state, and at the same time, when subjected to the pressure of the upper mold 2, it can achieve smooth and stable longitudinal displacement by virtue of the elastic deformation of the spring. During the process of the trigger rod 71 overcoming the elastic force and descending, the trigger rod 71 reliably transfers its longitudinal displacement to the actuator ring 74, driving the actuator ring 74 to move downward synchronously along the axis of the liquid-rising pipe 5.

[0057] The actuator cylinder 741, which is closely connected to the actuator ring 74, also moves downward synchronously. The arc-shaped driving groove 742 on the actuator cylinder 741 is in sliding cooperation with the guide pin 75. In the process of the actuator cylinder 741 moving downward, the motion trajectory of the guide pin 75 is gradually transformed from simple linear motion to circular motion around the axis of the riser 5 under the constraint and guidance of the arc-shaped driving groove 742. The linear motion of the actuator ring 74 and the actuator cylinder 741 is accurately converted into the rotational motion of the movable seat 32 around the fixed seat 31. As the movable seat 32 rotates to a specific angle relative to the fixed seat 31, the movable channels 321 distributed on the movable seat 32 and the fixed channels 311 on the fixed seat 31 are precisely connected and connected in space. At this time, under the action of external pressure, the molten metal in the riser 5 can smoothly pass through the fixed channels 311 and the movable channels 321 in turn and be pressed into the mold cavity, providing sufficient material supply for the molding of the casting.

[0058] When the casting process is completed and the mold separation process is entered, the trigger rod 71 begins to reset upward along the original path under the elastic restoring force released by the previously compressed upper elastic element 73. The elastic potential energy stored in the upper elastic element 73 is quickly converted into the mechanical energy of the trigger rod 71 at this time, pushing the trigger rod 71 to move upward. Due to the stable connection between the trigger rod 71 and the execution ring 74, the execution ring 74 and the execution cylinder 741 move upward synchronously. During the upward displacement of the execution cylinder 741. Under the constraint of the arc-shaped driving groove 742, the guide pin 75 rotates in the opposite direction along the axis of the riser 5, driving the movable seat 32 to rotate synchronously in the opposite direction, so that the movable channel 321 and the fixed channel 311 gradually intersect until the two are completely staggered. This action effectively blocks the passage between the cavity and the riser 5, preventing the outside air from entering the riser 5 through the cavity after the casting is taken out, thereby preventing the high-temperature molten metal in the riser 5 from oxidizing with the air, ensuring the quality and purity of the molten metal, and providing a reliable material basis for the subsequent casting process.

[0059] like Figure 4 and Figure 8 As shown, a conducting tube 12 extending downward to the upper recess is disposed at the bottom end of the liquid injection port 11 , and a sealing ring 121 coaxial therewith is disposed on the outer circumferential surface of the conducting tube 12 , and the sealing ring 121 abuts against the top end of the movable seat 32 .

[0060] A flange ring 51 is provided at the top end of the riser tube 5, and connecting pins 52 are provided on the flange ring 51 along its circumference. An arc-shaped positioning groove 322 distributed along its circumference and coaxial with the movable seat 32 is provided. The connecting pin 52 penetrates the flange ring 51, the fixed seat 31, the arc-shaped positioning groove 322 and the sealing ring 121 from bottom to top.

[0061] During system operation, the sealing ring 121 is in close contact with the top surface of the movable seat 32, and through its own elastic deformation, forms a reliable sealing barrier in the contact area between the two, effectively preventing the leakage of molten metal during the transmission process, ensuring the sealing and stability of the molten metal transmission during the casting process, and preventing the loss of molten metal due to leakage and the pollution of the surrounding working environment.

[0062] The movable seat 32 is provided with arc-shaped positioning grooves 322 which are evenly distributed along the circumferential direction and coaxial with the movable seat 32. During the assembly process, the connecting pin 52 passes through the flange ring 51, the fixed seat 31, the arc-shaped positioning groove 322 and the sealing ring 121 from bottom to top. The guiding effect of the arc-shaped positioning groove 322 limits the rotation angle and movement trajectory of the movable seat 32, which provides reliable mechanical positioning guarantee for the precise matching between the movable seat 32 and the fixed seat 31 during the mold closing and mold parting process, and the accurate connection and blocking of the movable channel 321 and the fixed channel 311, further improving the operation stability and reliability of the entire casting process system.

[0063] like Figure 4 As shown, the lower mold 1 is also provided with a push rod 13 that slides through the lower mold 1 in the vertical direction. In the closed mold state, the top of the push rod 13 is flush with the cavity. In the open mold state, the execution ring 74 abuts against the push rod 13 and makes the top of the push rod 13 higher than the bottom surface of the cavity.

[0064] The bottom end of the lower mold 1 is provided with a lower blind hole that penetrates into the cavity, the top end of the push rod 13 penetrates the top end of the lower blind hole and extends into the cavity, the push rod 13 is provided with a positioning ring 131 located in the lower blind hole, a lower elastic element 14 is provided between the positioning ring 131 and the top end of the lower blind hole, and the fixed mold seat 62 is provided with a through hole with a diameter smaller than the positioning ring 131, and the bottom end of the push rod 13 penetrates the through hole and slides with it.

[0065] As a component that directly acts on the casting, the top of the ejector pin 13 is kept flush with the cavity in the mold closing state. This design ensures that the ejector pin 13 will not interfere with the filling of the molten metal and the molding of the casting during the casting process. When the mold separation operation is started, the execution ring 74 abuts against the ejector pin 13, providing an upward driving force for the ejector pin 13. Under the action of this driving force, the ejector pin 13 overcomes the elastic force of the lower elastic element 14 and lifts the casting located in the cavity upward in the vertical direction. The accuracy and stability of this lifting action are crucial to prevent the casting from being damaged during the demolding process.

[0066] The lower elastic element 14 can prevent the push rod 13 from being stuck in the lower blind hole, thereby driving the positioning ring 131 to reset.

[0067] An automated die-casting method for the aluminum shell of an automotive liquid storage dryer, using an automated die-casting device for the aluminum shell of an automotive liquid storage dryer, includes the following steps:

[0068] Step 1: After the upper die 2 and the lower die 1 are closed, the valve passage of the valve member 3 conducts the lifting pipe 5 and the cavity;

[0069] Step 2: Inject gas into the holding furnace 4, the molten metal in the lifting pipe 5 rises and fills the cavity, and maintain the air pressure in the holding furnace 4 until the molten metal in the cavity is completely solidified to form a casting;

[0070] Step 3: Release the pressure in the holding furnace 4, the molten metal in the lifting pipe 5 that has not solidified flows back to the holding furnace 4, the valve passage of the valve member 3 is closed after die separation, and the casting is taken out.

[0071] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An automatic low-pressure casting device for the aluminum shell of an automotive liquid storage dryer, comprising a lower mold and an upper mold. A heat preservation furnace is arranged at the bottom of the lower mold. There is a liquid injection port in the lower mold for the metal liquid to enter the cavity. A lifting pipe with its top end communicating with the liquid injection port is arranged in the heat preservation furnace. It is characterized in that, A valve member linked to the upper mold is provided between the liquid riser and the liquid injection port, the valve member having a closable gate, the two ends of the gate being respectively connected to the liquid riser and the liquid injection port, the gate being opened after the mold is closed, and being closed after the mold is separated; The gate has fixed channels distributed along the circumference of the riser and movable channels that can communicate with the fixed channels. When the movable channels are in a connected state with the fixed channels, the gate is opened; when the movable channels are in a non-connected state with the fixed channels, the gate is closed. The fixed channel and the movable channel both extend in a direction parallel to the axis of the riser tube, and the molten metal passes through the fixed channel and the movable channel in sequence from the riser tube and then enters the mold cavity; The valve component includes a fixed seat and a movable seat, the fixed seat is fixedly arranged at the top of the liquid riser, the fixed channels are distributed in the fixed seat, the movable seat is rotatably arranged at the top of the fixed seat and forms a linkage with the upper mold, and the movable channels are distributed on the movable seat; when the upper mold and the lower mold are separated, the movable seat rotates relative to the fixed seat to make the movable channels and the fixed channels staggered.

2. The automatic low-pressure casting device for the aluminum shell of an automotive liquid storage dryer according to claim 1, wherein The fixed seat has a lower recess extending into the riser tube, and the fixed channel is distributed in the lower recess along the circumference of the riser tube. The movable seat has an upper recess extending into the inner cavity of the lower recess and loosely matched with the lower recess, and the movable channel is distributed in the upper recess along the circumference of the riser tube.

3. The automatic low-pressure casting device for the aluminum shell of an automotive liquid storage dryer according to claim 2, wherein, A linkage assembly for linking the upper mold and the movable seat is provided in the lower mold. The linkage assembly includes a trigger member arranged at the top of the lower mold and capable of abutting against the upper mold, and an actuator arranged at the bottom of the lower mold and transmission connected to the movable seat. When the upper mold abuts against the trigger member and the mold is closed, the actuator can drive the movable seat to rotate on the fixed seat to connect the fixed channel and the movable channel.

4. An automatic low-pressure casting device for an aluminum housing of an automotive liquid storage dryer according to claim 3, characterized in that, The trigger member includes a trigger rod that slides longitudinally through the lower mold, the trigger rod is elastically connected to the lower mold, and in the initial state, the top end of the trigger rod is higher than the mating surface of the lower mold; the actuator includes an actuator ring that is slidably arranged at the bottom of the lower mold along the axial direction of the liquid rising tube, and the trigger rod is connected to the actuator ring; the inner circumference of the actuator ring is provided with an actuator cylinder extending downward, and the actuator cylinder is provided with an arc-shaped driving groove coaxial with the actuator cylinder, and the outer circumferential surface of the movable seat is provided with a guide pin that slides with the arc-shaped driving groove.

5. An automatic low-pressure casting device for an aluminum housing of an automotive liquid storage dryer according to claim 3, characterized in that, A conducting tube extending downward into the upper recess is arranged at the bottom end of the liquid injection port, and a sealing ring coaxial with the conducting tube is arranged on the outer circumferential surface of the conducting tube, and the sealing ring abuts against the top end of the movable seat.

6. An automatic low-pressure casting device for an aluminum housing of an automotive liquid storage dryer according to claim 4, characterized in that, The lower mold is also provided with a push rod that slides through the lower mold in the vertical direction. In the closed mold state, the top of the push rod is flush with the cavity. In the open mold state, the execution ring abuts the push rod and makes the top of the push rod higher than the bottom surface of the cavity.

7. An automated low-pressure casting method for the aluminum housing of an automotive liquid storage dryer, characterized in that, The automatic low-pressure casting device for aluminum shell of an automobile liquid storage dryer as claimed in any one of claims 1 to 6 comprises the following steps: Step 1: After the upper mold and the lower mold are closed, the gate of the valve component is connected to the liquid riser and the cavity; Step 2: Inject gas into the holding furnace, so that the molten metal in the riser rises and fills the cavity, and the gas pressure in the holding furnace is maintained until the molten metal in the cavity is completely solidified to form a casting; Step 3: Release the pressure in the holding furnace, let the unfrozen molten metal in the riser tube flow back into the holding furnace, close the gate of the valve part after mold splitting, and take out the casting.

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