Vacuum die-casting equipment and aluminum movable shield die-casting process

Abstract

The present invention relates to the technical field of high-strength and toughness aluminum alloy workpiece die-casting, and discloses a vacuum die-casting device and an aluminum movable shield die-casting process. The present invention changes the vacuum degree inside the die-casting cavity by a vacuum machine, so that the volume of the die-casting cavity is reduced, and the energy consumption for reaching the vacuum degree is reduced. Then, aluminum liquid is supplied to the interior of the die-casting cavity by a liquid supply mechanism, and each receiving movable baffle and each casting movable baffle are synchronously moved in the opposite direction toward the center point of the die-casting cavity, so that the volume of the die-casting cavity can be driven to gradually expand by the pressure of the injected aluminum liquid, and the shape of the aluminum alloy workpiece can be gradually formed by each receiving movable baffle and each casting movable baffle, so that the aluminum alloy workpiece inside the die-casting cavity can be gradually thickened, and the generation of pores in the aluminum alloy workpiece during the forming process can be avoided by the coordination of the volume change of the cavity and the vacuum degree, thereby effectively improving the vacuum die-casting forming effect of the aluminum alloy workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of high-strength and toughness aluminum alloy workpiece die-casting, in particular to vacuum die-casting equipment and an aluminum movable shield die-casting process. Background Art

[0002] Vacuum die-casting technology is a key innovation in traditional die-casting processes. Its core goal is to improve the density and mechanical properties of castings by reducing or eliminating the gas content within the mold cavity. In traditional die-casting, molten metal fills the mold cavity at high speed and under high pressure. However, since air and lubricant volatile gases within the mold cavity cannot be completely expelled, defects such as pores and shrinkage are ultimately formed within the casting.

[0003] Among high-strength, lightweight structural parts (such as new energy vehicle battery housings and robot joint shields), movable shields, as typical thin-walled, multifunctional components, must simultaneously meet requirements for lightweight, high strength, and high impact toughness. In terms of process implementation, the complex geometric features of movable shields (such as reinforcing ribs, mounting bosses, and curved thin walls) result in long molten metal filling paths and large solidification gradients, making them prone to cold shuts, flow marks, or localized porosity. Traditional die-casting processes improve filling effects by increasing injection speed and boost pressure, but high-speed flow exacerbates gas entrapment, which in turn increases porosity.

[0004] In the production of active shield processes, vacuum die-casting equipment uses an integrated vacuum system to extract the gas in the cavity before or during the filling of molten metal, significantly reducing the porosity while also reducing the generation of oxide inclusions, thereby improving the overall performance of the material. However, the cavity geometry of traditional die-casting molds is completely fixed after mold closing, fundamentally limiting the process's adaptability to complex flow conditions and being the core reason why porosity defects are difficult to cure. During the molten metal filling process, the discharge of gas in the cavity depends on the preset exhaust grooves, overflow grooves, and the suction effect of the vacuum system. Since the mold cavity cannot be adjusted dynamically, "air traps" are easily formed in areas where the gas exhaust path is closed by the molten metal at the initial filling stage (such as deep cavities and narrow gaps), resulting in a sudden drop in local vacuum and the inability to effectively discharge the gas. When the molten aluminum converges from multiple directions, the gas may be compressed at the intersection, forming spherical pores with a diameter of tens of microns to several millimeters. The pores are mostly distributed in the core or near-surface area of ​​the casting, which may be exposed as surface defects during subsequent machining or stress. In severe cases, stress concentration and crack propagation are caused, resulting in poor molding of the high-strength, toughness and lightweight die-cast aluminum alloy movable shield. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a vacuum die-casting device and a die-casting process for an aluminum movable shield.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A vacuum die-casting device comprises a supporting base, a die-casting protective shell is provided on one side of the top of the supporting base, a vacuum machine and a liquid supply mechanism are provided on the other side of the top of the supporting base, a receiving mold and a casting mold are provided inside the die-casting protective shell, and the receiving mold and the casting mold form a die-casting cavity after the receiving mold and the casting mold are closed; after the receiving mold and the casting mold are closed, the vacuum machine can change the vacuum degree inside the die-casting cavity, and the liquid supply mechanism can supply molten aluminum to the die-casting cavity; a plurality of receiving movable baffles are movably provided inside the receiving mold, a plurality of receiving limit blocks are also fixedly provided inside the receiving mold, a plurality of casting movable baffles are movably provided inside the casting mold, and a plurality of casting limit blocks and a casting center block are also fixedly provided inside the casting mold; in the process of changes in the vacuum degree and the amount of molten aluminum inside the die-casting cavity, each of the receiving movable baffles and each of the casting movable baffles synchronously moves toward the center point position of the die-casting cavity to change the volume and shape of the die-casting cavity.

[0008] Preferably, during the synchronous movement of each of the receiving movable baffles, each of the receiving movable baffles can maintain a seal with each of the adjacent receiving limit blocks; during the synchronous movement of each of the casting movable baffles, each of the casting movable baffles can maintain a seal with each of the adjacent casting limit blocks and with the adjacent casting center block.

[0009] Preferably, the side surfaces of the receiving limit block close to the adjacent receiving movable baffles are provided with sliding limit grooves, and the side surfaces of the receiving movable baffles close to the adjacent receiving limit block are provided with sliding blocks, and the sliding blocks can respectively extend into the corresponding sliding limit grooves; a notch baffle is provided on the side of each sliding block close to the center point of the die-casting cavity, and sliding limit springs are respectively provided on both sides of the sliding block, and the ends of the sliding limit springs away from the sliding block are fixed between the inner walls of the sliding limit grooves.

[0010] Preferably, each side surface of the receiving movable baffle is provided with a sealing strip at one end close to the center point of the die-casting cavity, and the sealing strip can undergo elastic deformation, and the thickness of each sealing strip close to the center point of the die-casting cavity is greater than the thickness of the side away from the center point of the die-casting cavity; the side surface of each notch baffle close to the inner wall of the sliding limit groove is covered with a sealing layer, and the sealing layer can undergo elastic deformation; when the notch baffle moves with the receiving movable baffle under the restriction of the corresponding sliding limit groove, it can maintain the seal between each receiving movable baffle and each adjacent receiving limit block.

[0011] Preferably, the sides of the mold movable baffles close to the adjacent mold limit blocks are provided with mold stops, the sides of the mold limit blocks close to the adjacent mold movable baffles are provided with mold limit grooves, and a connecting port is also provided in the center of the mold center stop block; the mold stops of each mold movable baffle are respectively embedded in the corresponding mold limit grooves, and each mold movable baffle can slide under the restriction of each mold limit groove.

[0012] Preferably, a fluid reversing device is provided inside the die-casting shield and on the side of the casting mold close to the vacuum machine, and the fluid reversing device includes a connecting pipe, a vacuum pipe, an oil injection pipe and a liquid injection pipe; the vacuum pipe is connected to the vacuum machine, the liquid injection pipe is connected to the liquid supply mechanism, and the vacuum pipe and the oil injection pipe are also connected to the liquid injection pipe through an overflow pipe respectively; one end of the connecting pipe can be extended into the interior of the connecting port, and after the connecting pipe is extended into the interior of the connecting port, the outer wall of the connecting pipe and the inner wall of the connecting port remain sealed.

[0013] Preferably, a guide drive mechanism is also provided inside the die-casting shield, and the guide drive mechanism includes a plurality of guide rods, each of which passes through the receiving mold and the casting mold respectively, and each of the guide rods can limit the moving direction of the receiving mold and the casting mold; the guide drive mechanism also includes a driving cylinder and a pressing buffer unit, and the driving cylinder and the pressing buffer unit are respectively arranged on both sides of the receiving mold and the casting mold away from each other. Under the drive of the driving cylinder, the receiving mold can move toward the casting mold for closing under the restriction of the guide rod.

[0014] Preferably, the pressing buffer unit includes a plurality of limit sleeves, a buffer connecting plate and a plurality of hydraulic buffer cylinders, each two of the limit sleeves are fixedly mounted on both sides of the casting mold on the guide rod, and the buffer connecting plate is arranged on the side of the casting mold away from the receiving mold, and the two ends of each hydraulic buffer cylinder are respectively connected between the casting mold and the buffer connecting plate.

[0015] Preferably, the die-cast protective shell includes a fixed protective shell and a movable door plate, discharge windows are provided on both sides of the fixed protective shell, and a heat dissipation window is also provided on the top of the fixed protective shell; the movable door plate is slidingly connected to the fixed protective shell, and the movable door plate can slide to open and cover the discharge window.

[0016] A die-casting process for an aluminum movable shield, characterized in that the above-mentioned vacuum die-casting equipment is used, comprising the following steps:

[0017] The receiving mold and the casting mold are respectively configured according to the shape of the aluminum movable shield. When the space of the die-casting cavity is in the maximum state, the shape of the die-casting cavity matches the shape of the aluminum movable shield.

[0018] Under the action of the vacuum machine, the vacuum degree inside the die-casting cavity gradually approaches zero, and the volume of the die-casting cavity gradually shrinks;

[0019] After the vacuum degree inside the die-casting cavity reaches the minimum value, molten aluminum is supplied into the die-casting cavity through the liquid supply mechanism. Under the pressure of the molten aluminum, the volume of the die-casting cavity gradually increases, and the molten aluminum thickens and forms the components inside the die-casting cavity.

[0020] Compared with the prior art, the present invention provides a vacuum die-casting device and an aluminum movable shield die-casting process, which have the following beneficial effects:

[0021] 1. This vacuum die-casting equipment changes the vacuum degree inside the die-casting cavity through a vacuum machine. At this time, each receiving movable baffle and each casting movable baffle are synchronously moved forward toward the center point of the die-casting cavity, so that the volume of the die-casting cavity is reduced, which can reduce the conditions for achieving the required vacuum degree inside the die-casting cavity and reduce the energy consumption for achieving the said vacuum degree. Then, aluminum liquid is supplied to the die-casting cavity through a liquid supply mechanism, and each receiving movable baffle and each casting movable baffle are synchronously moved in the opposite direction toward the center point of the die-casting cavity, so that the volume of the die-casting cavity can be driven to gradually expand by the pressure of the injected aluminum liquid, and the shape of the aluminum alloy workpiece can be gradually formed by each receiving movable baffle and each casting movable baffle, so that the aluminum alloy workpiece inside the die-casting cavity can be gradually thickened, and the generation of pores in the aluminum alloy workpiece during the forming process can be avoided by the coordination of the volume change of the cavity and the vacuum degree, thereby effectively improving the vacuum die-casting forming effect of the aluminum alloy workpiece.

[0022] 2. This type of vacuum die-casting equipment has a notch baffle that can cover each sliding limit groove during relative sliding, and cooperates with the sealing strips set on each side of each receiving movable baffle and the sealing layer covering the side of each notch baffle close to the inner wall of the sliding limit groove to seal the die-casting cavity and the external sliding limit groove, thereby maintaining the sealing of the die-casting cavity in the receiving mold part, and similarly maintaining the sealing of the die-casting cavity in the casting mold part, ensuring the sealing between the entire die-casting cavity and the outside, and then ensuring the forming effect of the aluminum alloy workpiece through the shape of the die-casting cavity.

[0023] 3. This type of vacuum die-casting equipment, after the receiving mold and the casting mold are closed, first injects lubricating oil into the die-casting cavity through the oil injection pipe and the connecting pipe, so as to ensure the sealing of the die-casting cavity through the infiltration of the lubricating oil, and also ensure that the workpiece can be smoothly demoulded from the die-casting cavity after forming, and can draw back excess lubricating oil through the oil injection pipe, and then the vacuum machine provides negative pressure to the inside of the die-casting cavity through the vacuum pipe through the connecting pipe, thereby changing the vacuum degree inside the die-casting cavity, and then the liquid supply mechanism provides aluminum liquid to the inside of the die-casting cavity through the liquid injection pipe and the connecting pipe, and the excess aluminum liquid can flow back to the liquid injection pipe through the overflow pipe to avoid the aluminum liquid solidifying and clogging the vacuum pipe and the oil injection pipe. After the connecting pipe is extended into the connecting port, the outer wall of the connecting pipe and the inner wall of the connecting port are kept sealed to ensure the sealed communication between the connecting pipe and the die-casting cavity.

[0024] 4. This type of vacuum die-casting equipment, through the drive of the driving cylinder, the receiving mold can move toward the casting mold to close the mold under the restriction of the guide rod. Every two limit sleeves are fixedly mounted on both sides of the casting mold on the guide rod to limit the movement path of the casting mold. The buffer connecting plate is arranged on the side of the casting mold away from the receiving mold. The two ends of each hydraulic buffer cylinder are respectively connected to the casting mold and the buffer connecting plate. The stability of the mold closing can be improved through the buffering of the hydraulic buffer cylinder when the receiving mold and the casting mold are closed. The sliding connection between the movable door panel and the fixed protective shell can open and cover the discharge window when needed to provide protection to the outside world during the vacuum die-casting process and facilitate the removal of the aluminum alloy workpiece produced by die-casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is one of the three-dimensional structural schematic diagrams of a vacuum die-casting device of the present invention;

[0026] Figure 2 This is a second schematic diagram of the three-dimensional structure of a vacuum die-casting device of the present invention;

[0027] Figure 3 This is a partial structural diagram of a vacuum die-casting device according to the present invention;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of a receiving mold, a casting mold and a guide drive mechanism of a vacuum die-casting device of the present invention;

[0029] Figure 5 This is a schematic diagram of the assembly structure of a receiving mold, a casting mold, and a guide drive mechanism of a vacuum die-casting device of the present invention;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of a receiving mold of a vacuum die-casting device of the present invention;

[0031] Figure 7 This is a schematic diagram of the internal structure of a receiving mold of a vacuum die-casting device of the present invention;

[0032] Figure 8 For the present invention Figure 7 A magnified view of part A;

[0033] Figure 9 This is a schematic diagram of the three-dimensional structure of a casting mold of a vacuum die-casting device of the present invention.

[0034] In the figure: 1, support base; 2, die-casting shell; 21, fixed shell; 22, movable door panel; 3, vacuum machine; 4, liquid supply mechanism; 5, receiving mold; 51, receiving movable baffle; 511, sliding block; 512, notch baffle; 513, sliding limit spring; 514, sealing strip; 52, receiving limit block; 521, sliding limit groove; 6, casting mold; 61, casting movable baffle; 611, casting block; 6 2. Mold limit block; 621. Mold limit groove; 63. Mold center block; 631. Connecting port; 7. Fluid diverter; 71. Connecting pipe; 72. Vacuum pipe; 73. Oil injection pipe; 74. Liquid injection pipe; 75. Overflow pipe; 8. Guide drive mechanism; 81. Guide rod; 82. Drive cylinder; 83. Pressing buffer unit; 831. Limit sleeve shaft; 832. Buffer connecting plate; 833. Hydraulic buffer cylinder. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] As introduced in the background technology, in order to solve the deficiencies in the prior art and the above technical problems, the present application proposes a vacuum die-casting equipment and an aluminum movable shield die-casting process.

[0037] Example 1:

[0038] See also Figures 1-9A vacuum die-casting device comprises a supporting base 1, a die-casting protective shell 2 is provided on one side of the top of the supporting base 1, a vacuum machine 3 and a liquid supply mechanism 4 are provided on the other side of the top of the supporting base 1, a receiving mold 5 and a casting mold 6 are provided inside the die-casting protective shell 2, and a die-casting cavity is formed after the receiving mold 5 and the casting mold 6 are closed; after the receiving mold 5 and the casting mold 6 are closed, the vacuum machine 3 can change the vacuum degree inside the die-casting cavity, and the liquid supply mechanism 4 can supply aluminum liquid to the inside of the die-casting cavity; the movable device inside the receiving mold 5 There are several receiving movable baffles 51, and several receiving limit blocks 52 are fixedly set inside the receiving mold 5. Several mold movable baffles 61 are movably set inside the casting mold 6, and several casting limit blocks 62 and a casting center block 63 are fixedly set inside the casting mold 6. In the process of changes in the vacuum degree and the amount of aluminum liquid inside the die-casting cavity, each receiving movable baffle 51 and each casting movable baffle 61 moves synchronously toward the center point of the die-casting cavity, changing the volume and shape of the die-casting cavity.

[0039] During specific use, it is first necessary to select and configure appropriate receiving molds 5 and casting molds 6 according to the type of aluminum alloy workpiece to be processed, and set a preheating structure and a cooling structure inside the receiving mold 5 and the casting mold 6 (setting a preheating structure and a cooling structure in the mold is a common technical solution in the prior art and will not be repeated here). Specifically, when the space of the die-casting cavity is in the maximum state, the shape of the die-casting cavity matches the shape of the aluminum alloy workpiece actually processed and output. Among them, the accompanying drawings of this embodiment only show an embodiment in which the receiving movable baffle 51 and the casting movable baffle 61 are both integrated. During specific use, multiple receiving movable baffles 51 and multiple casting movable baffles 61 can be used to jointly limit the shape of the die-casting cavity, and when in use, the adjacent receiving movable baffles 51 and the adjacent casting movable baffles 61 are kept in a sealed state.

[0040] When in use, the aluminum liquid in the molten state (or semi-molten state) required for the production of aluminum alloy workpieces is pre-insulated inside the liquid supply mechanism 4, and before the receiving mold 5 and the casting mold 6 are closed (after the previously produced aluminum alloy workpiece is taken out from between the receiving mold 5 and the casting mold 6), oil is sprayed between the receiving mold 5 and the casting mold 6, so that after the receiving mold 5 and the casting mold 6 are closed, the receiving mold 5 and the casting mold 6 are preheated, and then the vacuum degree inside the die-casting cavity is changed by the vacuum machine 3 (so that the vacuum degree inside the die-casting cavity approaches zero). At this time, each receiving movable baffle 51 and each casting movable baffle 61 are synchronously moved toward the center point of the die-casting cavity (close to the center point of the die-casting cavity), so that the volume of the die-casting cavity is reduced, and it can The conditions for achieving the required vacuum degree inside the die-casting cavity are reduced, and the energy consumption for achieving the said vacuum degree is reduced. Then, aluminum liquid is supplied to the interior of the die-casting cavity through the liquid supply mechanism 4, and each receiving movable baffle 51 and each casting movable baffle 61 are synchronously moved in the opposite direction toward the center point of the die-casting cavity (away from the center point of the die-casting cavity), so that the volume of the die-casting cavity can be driven to gradually expand by the pressure of the injected aluminum liquid, and the shape of the aluminum alloy workpiece can be gradually formed by each receiving movable baffle 51 and each casting movable baffle 61, and the aluminum alloy workpiece inside the die-casting cavity can be gradually thickened, and the volume change of the cavity and the coordination of the vacuum degree can avoid the generation of pores in the aluminum alloy workpiece during the forming process, thereby effectively improving the vacuum die-casting forming effect of the aluminum alloy workpiece.

[0041] Example 2:

[0042] See also Figures 1-9 The difference from the above embodiment is that, during the synchronous movement of each receiving movable baffle 51, each receiving movable baffle 51 can maintain a seal with the adjacent receiving limit blocks 52; during the synchronous movement of each casting movable baffle 61, each casting movable baffle 61 can maintain a seal with the adjacent casting limit blocks 62 and the adjacent casting center block 63.

[0043] The side surfaces of the receiving limit block 52 close to the adjacent receiving movable baffles 51 are provided with sliding limit grooves 521, and the side surfaces of the receiving movable baffles 51 close to the adjacent receiving limit block 52 are provided with sliding blocks 511, and the sliding blocks 511 can respectively extend into the corresponding sliding limit grooves 521; each sliding block 511 is provided with a notch baffle 512 on one side close to the center point of the die-casting cavity, and sliding limit springs 513 are respectively provided on both sides of the sliding block 511, and the ends of the sliding limit springs 513 away from the sliding block 511 are fixed between the inner walls of the sliding limit grooves 521.

[0044] Each side surface of the receiving movable baffle 51 is provided with a sealing strip 514 at one end near the center point of the die-casting cavity. The sealing strip 514 can undergo elastic deformation, and the thickness of each sealing strip 514 near the center point of the die-casting cavity is greater than the thickness of the side away from the center point of the die-casting cavity; the side surface of each notch baffle 512 near the inner wall of the sliding limit groove 521 is covered with a sealing layer, and the sealing layer can undergo elastic deformation; when the notch baffle 512 moves with the receiving movable baffle 51 under the restriction of the corresponding sliding limit groove 521, it can maintain the seal between each receiving movable baffle 51 and each adjacent receiving limit block 52.

[0045] The mold movable baffle 61 is provided with a mold stopper 611 on the side close to each adjacent mold limit block 62, and the mold limit block 62 is provided with a mold limit groove 621 on the side close to each adjacent mold movable baffle 61, and a connecting port 631 is also provided in the center of the mold center stopper 63; each mold stopper 611 of each mold movable baffle 61 is respectively embedded in the corresponding mold limit groove 621, and each mold movable baffle 61 can slide under the restriction of each mold limit groove 621.

[0046] During specific use, through the setting of each receiving movable baffle 51, each movable receiving 51 generates relative sliding between each receiving movable baffle 51 and each receiving limit block 52 under the action of the vacuum degree provided by the vacuum machine 3 and the aluminum liquid pressure provided by the liquid supply mechanism 4. During this relative sliding process, through the setting of the sliding limiting spring 513, the difficulty of relative sliding can be increased through the elastic force of the sliding limiting spring 513, which can make the relative sliding state more stable. During the relative sliding process, through the setting of the notch baffle 512, the notch baffle 512 can block each sliding limit groove 521 during the relative sliding process, and cooperate with the sealing strip 514 (made of high-temperature elastic sealant, such as polysiloxane, polyimide, etc.) set on one end of each side of each receiving movable baffle 51 near the center point of the die-casting cavity. The thickness of each sealing strip 514 near the center point of the die-casting cavity is greater than the thickness of the side away from the center point of the die-casting cavity, and the side of each notch baffle 512 near the inner wall of the sliding limit groove 521 is covered The sealing layer (made of high-temperature elastic sealant, such as polysiloxane, polyimide, etc.) seals the die-casting cavity and the external sliding limit groove 521, thereby maintaining the sealing of the die-casting cavity in the receiving mold 5, and avoiding excessive defects in the shape of the formed aluminum alloy workpiece; similarly, under the action of the vacuum degree provided by the vacuum machine 3 and the aluminum liquid pressure provided by the liquid supply mechanism 4, each mold movable baffle 61 is formed between each mold limit block 62 and the mold center block 63. Relative sliding (the mold movable baffle 61 and the mold limit block 62 are also provided with a sealing structure similar to the receiving movable baffle 51 and the receiving limit block 52). During this relative sliding process, each mold movable baffle 61 can maintain the seal with the adjacent mold limit blocks 62 and the adjacent mold center block 63, thereby maintaining the seal of the die-casting cavity in the mold mold 6, and can ensure the seal between the entire die-casting cavity and the outside, and then through the shape of the die-casting cavity, ensure the forming effect of the aluminum alloy workpiece.

[0047] Example 3:

[0048] See also Figures 1-9 , the difference from the above embodiment is that a fluid reversing device 7 is provided inside the die-casting shell 2 and on the side of the casting mold 6 close to the vacuum machine 3. The fluid reversing device 7 includes a connecting pipe 71, a vacuum pipe 72, an oil injection pipe 73 and a liquid injection pipe 74; the vacuum pipe 72 is connected to the vacuum machine 3, the liquid injection pipe 74 is connected to the liquid supply mechanism 4, and the vacuum pipe 72 and the oil injection pipe 73 are also connected to the liquid injection pipe 74 through the overflow pipe 75 respectively; one end of the connecting pipe 71 can be extended into the connecting port 631, and after the connecting pipe 71 is extended into the connecting port 631, the outer wall of the connecting pipe 71 and the inner wall of the connecting port 631 are kept sealed.

[0049] During specific use, the oil injection pipe 73 is connected to the oil storage tank through the liquid pump, and electromagnetic valves are provided on the vacuum pipe 72 and the oil injection pipe 73 to control the on and off of the vacuum pipe 72 and the oil injection pipe 73. After the receiving mold 5 and the casting mold 6 are closed, lubricating oil is first injected into the die-casting cavity through the oil injection pipe 73 and the connecting pipe 71, so as to ensure the sealing of the die-casting cavity through the infiltration of the lubricating oil, and also to ensure that the workpiece can be smoothly demoulded from the die-casting cavity after being formed. When the lubricating oil is poured too much, the air pump connected to the oil injection pipe 73 can be used to pump back the excess lubricating oil through the liquid pump and the oil injection pipe 73. At the same time, the power of pumping out the excess lubricating oil is supplemented by the air pump. Then the vacuum machine 3 provides negative pressure to the inside of the die-casting cavity through the vacuum pipe 72 and the connecting pipe 71, thereby changing the vacuum degree inside the die-casting cavity. Then the liquid supply mechanism 4 (the liquid supply mechanism 4 usually includes an aluminum bag for providing molten aluminum liquid and a liquid pump and other power components for providing flow power of the aluminum liquid) provides aluminum liquid to the inside of the die-casting cavity through the liquid injection pipe 74 and the connecting pipe 71. The excess aluminum liquid can flow back to the liquid injection pipe 74 through the overflow pipe 75 to prevent the aluminum liquid from solidifying and clogging the vacuum pipe 72 and the oil injection pipe 73. After the connecting pipe 71 extends into the interior of the connecting port 631, the outer wall of the connecting pipe 71 and the inner wall of the connecting port 631 remain sealed, thereby ensuring the sealed communication between the connecting pipe 71 and the die-casting cavity.

[0050] A guiding drive mechanism 8 is also provided inside the die-casting shell 2, and the guiding drive mechanism 8 includes a plurality of guiding rods 81, each of which passes through the receiving mold 5 and the casting mold 6 respectively, and each of which can limit the moving direction of the receiving mold 5 and the casting mold 6; the guiding drive mechanism 8 also includes a driving cylinder 82 and a pressing buffer unit 83, and the driving cylinder 82 and the pressing buffer unit 83 are respectively arranged on both sides of the receiving mold 5 and the casting mold 6 away from each other. Under the drive of the driving cylinder 82, the receiving mold 5 can move toward the casting mold 6 to close the mold under the restriction of the guide rod 81.

[0051] The pressing buffer unit 83 includes several limiting sleeves 831, buffer connecting plates 832 and several hydraulic buffer cylinders 833. Every two limiting sleeves 831 are fixedly mounted on both sides of the casting mold 6 on the guide rod 81. The buffer connecting plate 832 is arranged on the side of the casting mold 6 away from the receiving mold 5. The two ends of each hydraulic buffer cylinder 833 are respectively connected between the casting mold 6 and the buffer connecting plate 832.

[0052] The die-casting protective shell 2 includes a fixed protective shell 21 and a movable door plate 22. Discharge windows are provided on both sides of the fixed protective shell 21, and a heat dissipation window is also provided on the top of the fixed protective shell 21. The movable door plate 22 is slidingly connected to the fixed protective shell 21, and the movable door plate 22 can slide to open and cover the discharge window.

[0053] During use, the receiving mold 5 can be moved toward the casting mold 6 to close the mold under the restriction of the guide rod 81 by driving the cylinder 82. Every two limit sleeves 831 are fixedly mounted on both sides of the casting mold 6 on the guide rod 81 to limit the movement path of the casting mold 6. The buffer connecting plate 832 is arranged on the side of the casting mold 6 away from the receiving mold 5. The two ends of each hydraulic buffer cylinder 833 are respectively connected to the casting mold 6 and the buffer connecting plate 832. When the receiving mold 5 and the casting mold 6 are closed, the stability of the closing mold can be improved through the buffering of the hydraulic buffer cylinder 833. Through the sliding connection between the movable door panel 22 and the fixed protective shell 21, the discharge window can be opened and covered when needed to provide protection to the outside world during the vacuum die-casting process and facilitate the removal of the aluminum alloy workpiece produced by die-casting.

[0054] Example 4:

[0055] A die-casting process for an aluminum movable shield, using a vacuum die-casting device as described in any one of Examples 1 to 3, comprises the following steps:

[0056] The receiving mold 5 and the casting mold 6 are respectively configured according to the shape of the aluminum movable shield. When the space of the die-casting cavity is in the maximum state, the shape of the die-casting cavity matches the shape of the aluminum movable shield.

[0057] Under the action of the vacuum machine 3, the vacuum degree inside the die casting cavity gradually approaches zero, and the volume of the die casting cavity gradually shrinks;

[0058] After the vacuum degree inside the die-casting cavity is at the minimum value, molten aluminum is supplied into the die-casting cavity through the liquid supply mechanism 4. Under the pressure of the molten aluminum, the volume of the die-casting cavity gradually increases, and the molten aluminum thickens and forms components inside the die-casting cavity.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum die-casting device, comprising a support base, a die-casting housing provided on one side of the top of the support base, and a vacuum machine and a liquid supply mechanism provided on the other side of the top of the support base, characterized in that: A receiving mold and a casting mold are provided inside the die-casting protective shell, and the receiving mold and the casting mold form a die-casting cavity after being combined; After the receiving mold and the casting mold are closed, the vacuum machine can change the vacuum degree inside the die-casting cavity, and the liquid supply mechanism can supply aluminum liquid into the die-casting cavity; The receiving mold is provided with a plurality of receiving movable baffles in a movable manner, the receiving mold is further provided with a plurality of receiving limit blocks in a fixed manner, the casting mold is provided with a plurality of mold movable baffles in a movable manner, the casting mold is further provided with a plurality of mold limit blocks and a casting center block in a fixed manner; During the process of changes in the vacuum degree and the amount of molten aluminum inside the die-casting cavity, each of the receiving movable baffles and each of the casting mold movable baffles synchronously move toward the center point of the die-casting cavity, thereby changing the volume and shape of the die-casting cavity; Under the action of the vacuum machine, the vacuum degree inside the die-casting cavity gradually approaches zero, and the volume of the die-casting cavity gradually shrinks; After the vacuum degree inside the die-casting cavity reaches the minimum value, molten aluminum is supplied into the die-casting cavity through the liquid supply mechanism. Under the pressure of the molten aluminum, the volume of the die-casting cavity gradually increases, and the molten aluminum thickens and forms the components inside the die-casting cavity. During the synchronous movement of each receiving movable baffle, each receiving movable baffle can maintain a seal with each adjacent receiving limit block; The side surfaces of the receiving limit stoppers close to the adjacent receiving movable baffles are each provided with a sliding limit groove, and the side surfaces of the receiving movable baffles close to the adjacent receiving limit stoppers are each provided with a sliding stopper, and the sliding stoppers can respectively extend into the corresponding sliding limit grooves; A notch baffle is provided on one side of each sliding block close to the center point of the die-casting cavity, and sliding limiting springs are provided on both sides of the sliding block. The ends of the sliding limiting springs away from the sliding block are fixed between the inner walls of the sliding limiting grooves.

2. The vacuum die-casting equipment according to claim 1, characterized in that: During the synchronous movement of each of the mold movable baffles, each of the mold movable baffles can maintain a seal with each of the adjacent mold limit blocks and the adjacent mold center block.

3. The vacuum die-casting equipment according to claim 2, characterized in that: Each side of the movable baffle is provided with a sealing strip at one end close to the center of the die-casting cavity. The sealing strip is elastically deformable, and the thickness of each sealing strip close to the center of the die-casting cavity is greater than the thickness of the side away from the center of the die-casting cavity. The side surfaces of each notch baffle close to the inner wall of the sliding limit groove are covered with a sealing layer, and the sealing layer can undergo elastic deformation; When the notch baffle moves along with the receiving movable baffle under the restriction of the corresponding sliding limit groove, the seal between each receiving movable baffle and each adjacent receiving limit block can be maintained.

4. The vacuum die-casting equipment according to claim 2, characterized in that: The sides of the mold movable baffles close to the adjacent mold limit blocks are provided with mold stoppers, the sides of the mold limit blocks close to the adjacent mold movable baffles are provided with mold limit grooves, and the center of the mold center stopper is also provided with a communication port; Each of the mold stoppers of each of the mold movable baffles is respectively embedded in the corresponding mold limiting grooves, and each of the mold movable baffles can slide under the restriction of each of the mold limiting grooves.

5. The vacuum die-casting equipment according to claim 4, characterized in that: A fluid reversing device is provided inside the die-casting housing and on a side of the casting mold close to the vacuum machine. The fluid reversing device includes a connecting pipe, a vacuum pipe, an oil injection pipe, and a liquid injection pipe. The vacuum pipe is connected to the vacuum machine, the liquid injection pipe is connected to the liquid supply mechanism, and the vacuum pipe and the oil injection pipe are also connected to the liquid injection pipe through an overflow pipe respectively; One end of the communication pipe can extend into the communication port, and after the communication pipe extends into the communication port, the outer wall of the communication pipe and the inner wall of the communication port are kept sealed.

6. The vacuum die-casting equipment according to claim 1, characterized in that: A guide drive mechanism is further provided inside the die-casting housing, and the guide drive mechanism includes a plurality of guide rods, each of which passes through the receiving mold and the casting mold respectively, and each of the guide rods can limit the movement direction of the receiving mold and the casting mold; The guide drive mechanism also includes a driving cylinder and a pressing buffer unit, which are respectively arranged on both sides of the receiving mold and the casting mold that are far away from each other. Under the drive of the driving cylinder, the receiving mold can move toward the casting mold to close the mold under the restriction of the guide rod.

7. The vacuum die-casting equipment according to claim 6, characterized in that: The pressing buffer unit includes several limiting sleeves, buffer connecting plates and several hydraulic buffer cylinders. Every two limiting sleeves are fixedly mounted on both sides of the casting mold on the guide rod. The buffer connecting plate is arranged on the side of the casting mold away from the receiving mold. The two ends of each hydraulic buffer cylinder are respectively connected between the casting mold and the buffer connecting plate.

8. The vacuum die-casting equipment according to claim 1, characterized in that: The die-casting protective shell includes a fixed protective shell and a movable door plate. Both sides of the fixed protective shell are provided with discharge windows, and the top of the fixed protective shell is also provided with a heat dissipation window. The movable door plate is slidably connected to the fixed protective shell, and the movable door plate can be slid to open and cover the discharge window.

9. A die-casting process for an aluminum movable shield, characterized in that: A vacuum die-casting device according to any one of claims 1 to 8 is used, comprising the following steps: The receiving mold and the casting mold are respectively configured according to the shape of the aluminum movable shield. When the space of the die-casting cavity is in the maximum state, the shape of the die-casting cavity matches the shape of the aluminum movable shield. Under the action of the vacuum machine, the vacuum degree inside the die-casting cavity gradually approaches zero, and the volume of the die-casting cavity gradually shrinks; After the vacuum degree inside the die-casting cavity reaches the minimum value, molten aluminum is supplied into the die-casting cavity through the liquid supply mechanism. Under the pressure of the molten aluminum, the volume of the die-casting cavity gradually increases, and the molten aluminum thickens and forms the components inside the die-casting cavity.

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