Aluminum alloy thin-walled structure part and preparation method thereof

Abstract

This invention relates to the field of automotive manufacturing equipment technology, specifically disclosing a die-casting equipment and process for lightweight thin-walled automotive structural parts. The equipment includes a base plate, with sliding rods symmetrically fixedly connected to the upper edge surface of the base plate, and a top plate fixedly connected to the top of each sliding rod. It also includes a die-casting mechanism, which is fixedly mounted on the base plate. This invention ensures that the vents remain open after the outer cover and lower mold are assembled, preventing the upper and lower molds from being unable to recombine due to insufficient air pressure in the mold cavity after the outer cover enters the lower mold. Once the lower and upper molds are assembled, the outer cover can no longer move downwards. At this point, the inner cover continues to move downwards, causing the threaded rod inside the inner cover to move downwards. This automatically seals the vents after the upper and lower molds are assembled, facilitating subsequent injection operations and preventing aluminum leakage caused by unsealed vents.

Description

Technical Field

[0001] This invention relates to the field of automotive manufacturing equipment technology, specifically to a die-casting equipment and process for lightweight thin-walled structural parts for automobiles. Background Technology

[0002] Lightweighting is a crucial direction for the current development of the automotive industry. By using lightweight materials such as aluminum alloys and magnesium alloys to manufacture vehicle bodies and structural components, the overall vehicle weight can be effectively reduced, fuel consumption decreased, and driving range increased. Thin-walled structural components, due to their complex geometry and high mechanical performance requirements, are typically formed using high-pressure die casting. The die casting process involves rapidly filling a precision mold cavity with molten metal under high pressure, followed by cooling to obtain the part.

[0003] Existing die-casting equipment still has the following shortcomings in practical applications: First, during mold closing, the upper and lower molds gradually close, and the air in the cavity needs to be expelled in time. Traditional equipment usually relies on the parting surface gap or independent venting grooves for venting, but these channels cannot close automatically before the molten metal is injected, causing the molten aluminum to easily seep out along the venting channels during injection, which not only wastes material but also forms burrs on the surface of the casting, increasing the subsequent cleaning process. If the venting channels are designed to be too narrow to prevent leakage, the gas cannot be quickly expelled during mold closing, easily resulting in porosity defects. Second, the sealing between molds mostly relies on a single rigid contact or ordinary sealing ring. Under the impact of high-temperature and high-pressure molten aluminum, the seals are prone to aging and failure, resulting in gaps at the parting surface. After the molten aluminum leaks out, it forms burrs, and in severe cases, it can even damage the mold. At the same time, the sealing structure of traditional equipment cannot automatically adjust the sealing force according to the mold closing state, always pressing with the same pressure, which reduces the sealing effect after long-term use. Third, after the casting cools and solidifies, the shrinkage of the metal volume often creates a negative pressure state inside the mold cavity, resulting in a strong adhesion between the upper mold and the casting. Demolding often requires forceful pulling, which can easily cause deformation, scratches, or mold damage. Traditional equipment lacks a mechanism to automatically break the negative pressure before demolding, requiring operators to use skids or repeatedly eject the casting, which is not only inefficient but also affects mold life. Fourth, the aforementioned venting, sealing, and vacuum breaking actions usually require multiple independent drive sources or manual operation, resulting in complex equipment structures, low automation, and difficulty in achieving continuous and stable batch production. In summary, how to achieve automatic venting during mold closing, automatic sealing before liquid injection, and automatic vacuum breaking before demolding, while simplifying the equipment structure and improving operational reliability, are urgent technical problems that existing die-casting equipment for lightweight thin-walled automotive structural parts needs to solve. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] This invention provides a die-casting equipment and die-casting process for lightweight thin-walled structural parts for automobiles, solving the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a die-casting device for lightweight thin-walled structural parts of automobiles, comprising a base plate, wherein sliding rods are symmetrically and fixedly connected to the upper edge surface of the base plate, and a top plate is fixedly connected to the top of the sliding rods; and further comprising a die-casting mechanism, wherein the die-casting mechanism is fixedly mounted on the base plate; wherein the die-casting mechanism comprises a lower mold, the lower mold is fixedly mounted on the upper surface of the middle part of the base plate, wherein a mold cavity is formed on the upper surface of the lower mold, an upper mold is disposed in the mold cavity, a connecting rod is fixedly connected to the top outer surface of the upper mold, the connecting rod is slidably connected to the outer surface of the sliding rod, and an injection hole is formed through the bottom outer surface of the lower mold.

[0008] According to one embodiment of the present invention, the upper mold includes an extrusion plate, which is slidably connected to a slide rod via a connecting rod. An inner cover is fixedly connected to the bottom surface of the extrusion plate, and an outer cover is rubbed and slidably sleeved on the bottom outer surface of the inner cover, wherein the diameter of the outer cover is equal to the diameter of the cavity of the lower mold.

[0009] According to one embodiment of the present invention, a first magnetic ring is fixedly embedded on the outer surface of the outer cover, and a second magnetic ring is fixedly embedded on the inner surface of the lower mold.

[0010] According to one embodiment of the present invention, a rotating ring is rotatably connected to the inner surface of the middle part of the outer cover, and a sealing plate is fixedly connected to the inner surface of the rotating ring. The sealing plates are arranged at fixed intervals around the central axis of the rotating ring, wherein the bottom surface of the sealing plate is attached to the inner surface of the outer cover, and a mounting base is fixedly connected to the inner end of the sealing plate. The bottom of the mounting base is rotatably connected to the inner surface of the middle part of the outer cover.

[0011] According to one embodiment of the present invention, a baffle is fixedly connected to the inner surface of the outer cover, and the baffle is arranged at four fixed intervals around the central axis of the outer cover. An air hole is opened through the lower surface of the outer cover, and the air hole is arranged at four fixed intervals around the central axis of the outer cover.

[0012] According to one embodiment of the present invention, a threaded rod is threadedly connected to the upper surface of the middle part of the mounting base, the top of the threaded rod is fixedly connected to the inner surface of the middle part of the inner cover, an air-gathering groove is provided at the bottom of the mounting base, a hose interface is reserved at the top of the mounting base, an elastic telescopic ring is fixedly embedded on the lower edge of the inner cover, and a hose interface is reserved on the inner side surface of the inner cover, wherein the inner cavity of the elastic telescopic ring communicates with the inner cavity of the air-gathering groove through the hose interface.

[0013] According to one embodiment of the present invention, a sealing ring is fixedly embedded on the bottom outer surface of the outer cover, wherein the sealing ring is made of fluororubber and the interior of the sealing ring is hollow. At the same time, a hose interface is reserved on the upper edge of the outer cover, and the internal cavity of the sealing ring is connected to the internal cavity of the elastic telescopic ring through the hose interface.

[0014] According to one embodiment of the present invention, an annular groove is formed on the lower surface of the sealing plate, wherein the annular groove communicates with the gas gathering groove, and a sliding ring is elastically slidably connected in the annular groove. A sealing ring is fixedly connected to the bottom of the sliding ring, and the sealing ring is made of fluororubber, wherein a buffer cavity is provided in the sealing ring.

[0015] A die-casting process for lightweight thin-walled structural parts for automobiles includes the following steps: S1, driving the upper mold to move down along the slide bar and approach the lower mold using an external hydraulic device, until the upper mold and the lower mold coincide; S2, injecting molten aluminum into the mold cavity between the upper mold and the lower mold through the injection hole on the lower mold, and then waiting for cooling; S3, after cooling, pulling the upper mold up using a hydraulic device to complete the mold demolding.

[0016] The extrusion plate on the upper mold is connected to an external hydraulic device. When die casting of thin-walled automotive structural parts is required, the extrusion plate is driven to move down along the slide bar by the external hydraulic device. This simultaneously moves the inner and outer covers down towards the lower mold. Finally, the outer cover of the upper mold and the lower mold are interlocked. After the interlocking is completed, an injection cavity is reserved. Then, molten aluminum is injected into the cavity through the injection hole. After the molten aluminum cools down and solidifies, the upper mold is moved up again by the hydraulic device to remove the thin-walled structural part. When the upper mold moves down towards the lower mold, the outer cover will first embed itself into the lower mold. As the outer cover continues to move down, the first magnetic ring and the second magnetic ring will eventually face each other and generate magnetic attraction. At this point, the outer cover can no longer move down, and the inner cover begins to move down relative to the outer cover, i.e., the inner cover enters the outer cover. Before this, the vent on the outer cover is connected to the mold cavity, and at the same time, the vent is connected to the outside through the inner cover.

[0017] (III) Beneficial Effects

[0018] This invention provides a die-casting equipment and process for lightweight thin-walled structural parts for automobiles. It offers the following advantages:

[0019] (I) The die-casting equipment and process for this lightweight thin-walled structural component of automobiles ensure that the vent remains open after the outer cover and lower mold are combined. This avoids the problem of the upper and lower molds being unable to recombine due to the inability to release the air pressure in the mold cavity after the outer cover enters the lower mold. Once the lower mold and upper mold are combined, the outer cover can no longer move down. At this time, the inner cover continues to move down, which drives the threaded rod inside the inner cover to move down. The threaded rod is connected to the mounting base. As the threaded rod moves down, the mounting base, along with the sealing plate and rotating ring, will start to rotate. Eventually, the sealing plate rotates to the vent and blocks it. This achieves automatic sealing of the vent after the upper and lower molds are combined, which facilitates subsequent injection operations and avoids aluminum liquid leakage caused by the inability to seal the vent.

[0020] (II) The die-casting equipment and process for this lightweight thin-walled structural component of the automobile: When the inner cover moves down relative to the outer cover, the output end of the elastic telescopic ring will be squeezed, that is, the internal cavity of the elastic telescopic ring will be squeezed, and then its internal air pressure will be transported to the sealing ring, causing the sealing ring to expand, thereby further sealing the outer cover and the lower mold, preventing the aluminum liquid from leaking through the gap between the outer cover and the lower mold, which would cause the mold to have burrs. At the same time, when the elastic telescopic ring is squeezed, its internal air pressure will also be transported to the gas gathering groove of the mounting seat, so that the air pressure inside the ring groove connected to the gas gathering groove will increase, thereby pushing the sliding ring down, that is, the sealing ring at the bottom of the sliding ring will start to move down, and finally squeeze and fit against the edge of the air hole, achieving complete sealing of the air hole, thereby achieving complete sealing between the upper mold and the lower mold before injection, which greatly improves the subsequent mold forming quality.

[0021] (III) In the die-casting equipment and process for the lightweight thin-walled structural parts of this automobile, during demolding, the outer cover cannot move upward with the inner cover in time due to magnetic force. That is, the inner cover begins to move upward relative to the outer cover first. At this time, under the action of the threaded rod, the sealing plate begins to rotate to release the blockage of the air vents. At the same time, the sealing ring also begins to move into the annular groove to disengage from the inner surface of the outer cover, and the sealing ring also begins to contract. Finally, when the inner cover can no longer move upward relative to the outer cover, the air vents are completely opened, and the seal between the outer cover and the lower mold is also released. At this time, as the inner cover moves upward, it will drive the outer cover to overcome the magnetism and detach from the lower mold, and air pressure will be drawn into the mold cavity through the air vents for filling, thereby achieving automatic demolding first. By opening the air vents to relieve negative pressure in the mold cavity, the equipment avoids the problem of difficulty in opening due to negative pressure, which could lead to equipment damage. This equipment operates fully automatically, significantly reducing operational difficulty and making it easy to use. After demolding, the upper mold fully resets, supporting continuous automatic production. The internal buffer cavity of the sealing ring provides excellent contractile force, rapidly reducing friction between the sealing ring and the outer cover as the sealing plate rotates during initial contact with the inner surface of the outer cover and during demolding. Maximum pressure is only reached when the sealing plate fully seals the air vents, significantly improving the protection of the sealing ring and avoiding the need for frequent replacements after prolonged use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the mold of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the mold of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the outer cover of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the elastic expansion ring of the present invention;

[0027] Figure 6 This is a schematic diagram of the sealing plate of the present invention;

[0028] Figure 7 This is a schematic diagram of the sliding ring structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the sealing ring of the present invention.

[0030] In the diagram: 1. Base plate; 2. Slide rod; 3. Top plate; 4. Die-casting mechanism; 41. Lower mold; 42. Mold cavity; 43. Upper mold; 44. Connecting rod; 45. Injection hole; 46. Extrusion plate; 47. Inner cover; 48. Outer cover; 49. Magnetic ring No. 1; 410. Magnetic ring No. 2; 411. Rotating ring; 412. Sealing plate; 413. Mounting base; 414. Baffle; 415. Air hole; 416. Threaded rod; 417. Air collection groove; 418. Elastic telescopic ring; 419. Sealing ring; 420. Ring groove; 421. Sliding ring; 422. Sealing ring; 423. Buffer cavity. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: a die-casting equipment for lightweight thin-walled structural parts for automobiles, including a base plate 1, with slide rods 2 symmetrically fixedly connected to the upper surface of the edge of the base plate 1, and a top plate 3 fixedly connected to the top of the slide rods 2, and further including:

[0033] Die-casting mechanism 4 is fixedly installed on base plate 1;

[0034] The die-casting mechanism 4 includes a lower mold 41, which is fixedly installed on the upper surface of the middle part of the base plate 1. A mold cavity 42 is opened on the upper surface of the lower mold 41, and an upper mold 43 is arranged inside the mold cavity 42. A connecting rod 44 is fixedly connected to the top outer surface of the upper mold 43, and the connecting rod 44 is slidably connected to the outer surface of the slide rod 2. An injection hole 45 is opened through the bottom outer surface of the lower mold 41.

[0035] The upper mold 43 includes an extrusion plate 46, which is slidably connected to the slide bar 2 via a connecting rod 44. An inner cover 47 is fixedly connected to the bottom surface of the extrusion plate 46, and an outer cover 48 is rubbed and slidably sleeved on the bottom outer surface of the inner cover 47. The diameter of the outer cover 48 is equal to the diameter of the mold cavity 42 of the lower mold 41.

[0036] A first magnetic ring 49 is fixedly embedded on the outer surface of the outer cover 48, and a second magnetic ring 410 is fixedly embedded on the inner surface of the lower mold 41.

[0037] A rotating ring 411 is rotatably connected to the inner surface of the middle part of the outer cover 48. A sealing plate 412 is fixedly connected to the inner surface of the rotating ring 411. Four sealing plates 412 are fixedly spaced around the central axis of the rotating ring 411. The bottom surface of the sealing plate 412 is attached to the inner surface of the outer cover 48. A mounting base 413 is fixedly connected to the inner end of the sealing plate 412. The bottom of the mounting base 413 is rotatably connected to the inner surface of the middle part of the outer cover 48.

[0038] A baffle 414 is fixedly connected to the inner surface of the outer cover 48. The baffle 414 is arranged at four fixed intervals around the central axis of the outer cover 48. An air hole 415 is opened through the lower surface of the outer cover 48. The air hole 415 is arranged at four fixed intervals around the central axis of the outer cover 48.

[0039] A threaded rod 416 is threadedly connected to the upper middle surface of the mounting base 413. The top of the threaded rod 416 is fixedly connected to the inner middle surface of the inner cover 47. An air-gathering groove 417 is provided at the bottom of the mounting base 413. A hose interface is reserved at the top of the mounting base 413. An elastic telescopic ring 418 is fixedly embedded on the lower edge of the inner cover 47. A hose interface is reserved on the inner side surface of the inner cover 47. The internal cavity of the elastic telescopic ring 418 is connected to the internal cavity of the air-gathering groove 417 through the hose interface.

[0040] A sealing ring 419 is fixedly embedded on the bottom outer surface of the outer cover 48. The sealing ring 419 is made of fluororubber and the inside of the sealing ring 419 is hollow. At the same time, a hose interface is reserved on the upper edge of the outer cover 48. The internal cavity of the sealing ring 419 is connected to the internal cavity of the elastic telescopic ring 418 through the hose interface.

[0041] The lower surface of the sealing plate 412 is provided with an annular groove 420, which is connected to the gas gathering groove 417. A sliding ring 421 is elastically slidably connected in the annular groove 420. A sealing ring 422 is fixedly connected to the bottom of the sliding ring 421. The sealing ring 422 is made of fluororubber and a buffer cavity 423 is provided in the sealing ring 422.

[0042] A die-casting process for lightweight thin-walled structural components in automobiles includes the following steps:

[0043] S1. Drive the upper mold 43 along the slide bar 2 to move closer to the lower mold 41 through the external hydraulic equipment, and finally the upper mold 43 and the lower mold 41 coincide.

[0044] S2. Inject molten aluminum into the cavity 42 between the upper mold 43 and the lower mold 41 through the injection hole 45 on the lower mold 41, and then wait for it to cool down.

[0045] S3. After cooling down, the upper mold 43 is pulled up by hydraulic equipment to complete the mold demolding.

[0046] During operation, the extrusion plate 46 on the upper mold 43 is connected to an external hydraulic device. When die casting of thin-walled automotive structural parts is required, the extrusion plate 46 is driven to move down along the slide bar 2 via the external hydraulic device, which simultaneously moves the inner cover 47 and the outer cover 48 down towards the lower mold 41. Finally, the outer cover 48 of the upper mold 43 and the lower mold 41 are interlocked, and an injection cavity 42 is reserved after the interlocking is completed. Then, molten aluminum is injected into the cavity 42 through the injection hole 45. After the molten aluminum cools down and solidifies, the upper mold 43 is moved up again via the hydraulic device to remove the thin-walled structural part. When the upper mold 43 moves down towards the lower mold 41, the outer cover 48 will first embed into the lower mold 41. As the outer cover 48 continues to move down, the first magnetic ring 49 and the second magnetic ring 41 are finally interlocked. When the outer cover 48 and the inner cover 47 are magnetically attracted to each other, the outer cover 48 can no longer move downwards. The inner cover 47 then begins to move downwards relative to the outer cover 48, entering the outer cover 48. Before this, the vent 415 on the outer cover 48 is connected to the mold cavity 42, and simultaneously, the vent 415 is connected to the outside through the inner cover 47. This ensures that the vent 415 remains open after the outer cover 48 and the lower mold 41 are combined, preventing the upper mold 43 from failing to recombine with the lower mold 41 due to the inability to release air pressure in the mold cavity 42 after the outer cover 48 enters the lower mold 41. Once the lower mold 41 and the upper mold 43 are combined, the outer cover 48 can no longer move downwards. The inner cover 47 then continues to move downwards, causing the threaded rod 416 inside the inner cover 47 to move downwards. The threaded rod 416 and... The mounting bases 413 are threaded together. As the threaded rod 416 moves downward, the mounting base 413, along with the sealing plate 412 and the rotating ring 411, will begin to rotate. Eventually, the sealing plate 412 will rotate to the vent 415 and block it. This automatically seals the vent 415 after the upper mold 43 and lower mold 41 are assembled, facilitating subsequent injection operations and preventing aluminum leakage caused by the vent 415 not being sealed. When the inner cover 47 moves downward relative to the outer cover 48, the output end of the elastic telescopic ring 418 will be compressed, that is, the internal cavity of the elastic telescopic ring 418 will be compressed, thereby transmitting its internal air pressure to the sealing ring 419, causing the sealing ring 419 to expand. This, in turn, seals the outer cover 48 and the lower mold 41. This one-step sealing prevents molten aluminum from leaking through the gap between the outer cover 48 and the lower mold 41, thus avoiding burrs on the mold. Simultaneously, when the elastic telescopic ring 418 is compressed, it delivers its internal air pressure to the gas-gathering groove 417 of the mounting base 413. This increases the air pressure inside the ring groove 420 connected to the gas-gathering groove 417, causing the sliding ring 421 to move downwards. Ultimately, this causes the sealing ring 422 at the bottom of the sliding ring 421 to move downwards, eventually pressing against the edge of the vent 415, completely sealing the vent 415. This achieves a complete seal between the upper mold 43 and the lower mold 41 before injection, significantly improving the subsequent mold forming quality. During demolding, the outer cover 48, due to magnetic properties, cannot move upwards with the inner cover 47 in time.The inner cover 47 begins to move upward relative to the outer cover 48. At this time, under the action of the threaded rod 416, the sealing plate 412 begins to rotate to release the blockage of the air hole 415. Simultaneously, the sealing ring 422 also begins to move into the annular groove 420 to disengage from the inner surface of the outer cover 48, and the sealing ring 419 also begins to contract. Finally, when the inner cover 47 can no longer move upward relative to the outer cover 48, the air hole 415 is fully opened, and the seal between the outer cover 48 and the lower mold 41 is also released. At this time, as the inner cover 47 moves upward, it will drive the outer cover 48 to overcome the magnetism and disengage from the lower mold 41. Air pressure is then drawn into the mold cavity 42 through the air hole 415 for filling, thereby achieving automatic opening of the air hole 415 to release the negative pressure in the mold cavity 42 before demolding, thus preventing the mold cavity 42 from being blocked. The problem of difficulty in opening due to internal negative pressure, which could lead to equipment damage, is addressed by this fully automatic machine, significantly reducing operational difficulty and making it easy to use. After demolding, the upper mold 43 fully resets, supporting continuous automatic production. The inclusion of a buffer cavity 423 inside the sealing ring 422 ensures good contractile force, rapidly reducing friction between the sealing ring 422 and the outer cover 48 as the sealing plate 412 rotates during initial contact with the inner surface of the outer cover 48 and during demolding. Maximum pressure is only reached when the sealing plate 412 fully seals the pores 415, significantly improving the protection of the sealing ring 422 and avoiding frequent replacements after prolonged use.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die casting apparatus for a light-weight thin-walled structural member of an automobile, comprising a base plate, characterized by: The upper edge surface of the base plate is symmetrically and fixedly connected with sliding rods, and the top of the sliding rods is fixedly connected with a top plate, and the base plate also includes: A die-casting mechanism, which is fixedly mounted on a base plate; The die-casting mechanism includes a lower mold, which is fixedly installed on the upper surface of the middle part of the base plate. A mold cavity is opened on the upper surface of the lower mold, and an upper mold is arranged inside the mold cavity. A connecting rod is fixedly connected to the top outer surface of the upper mold, and the connecting rod is slidably connected to the outer surface of the slide rod. An injection hole is opened through the bottom outer surface of the lower mold.

2. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 1, characterized in that: The upper mold includes an extrusion plate, which is slidably connected to a slide rod via a connecting rod. An inner cover is fixedly connected to the bottom surface of the extrusion plate, and an outer cover is rubbed and slidably sleeved on the bottom outer surface of the inner cover. The diameter of the outer cover is equal to the diameter of the cavity of the lower mold.

3. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 2, characterized in that: A first magnetic ring is fixedly embedded on the outer surface of the outer cover, and a second magnetic ring is fixedly embedded on the inner surface of the lower mold.

4. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 3, characterized in that: A rotating ring is rotatably connected to the inner surface of the middle part of the outer cover. A sealing plate is fixedly connected to the inner surface of the rotating ring. The sealing plates are arranged at fixed intervals around the central axis of the rotating ring. The bottom surface of the sealing plate is attached to the inner surface of the outer cover. A mounting base is fixedly connected to the inner end of the sealing plate. The bottom of the mounting base is rotatably connected to the inner surface of the middle part of the outer cover.

5. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 4, characterized in that: A baffle is fixedly connected to the inner surface of the outer cover, and the baffle is set at a fixed interval of four around the central axis of the outer cover. An air hole is opened through the lower surface of the outer cover, and the air hole is set at a fixed interval of four around the central axis of the outer cover.

6. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 5, characterized in that: The upper surface of the middle part of the mounting base is threaded with a threaded rod, the top of which is fixedly connected to the inner surface of the middle part of the inner cover. The bottom of the mounting base is provided with an air-gathering groove, and the top of the mounting base is reserved with a hose interface. The lower edge of the inner cover is fixedly inlaid with an elastic telescopic ring, and the inner side surface of the inner cover is reserved with a hose interface. The internal cavity of the elastic telescopic ring is connected to the internal cavity of the air-gathering groove through the hose interface.

7. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 6, characterized in that: A sealing ring is fixedly embedded on the bottom outer surface of the outer cover. The sealing ring is made of fluororubber and is hollow inside. At the same time, a hose interface is reserved on the upper edge of the outer cover. The internal cavity of the sealing ring is connected to the internal cavity of the elastic telescopic ring through the hose interface.

8. The die-casting equipment for lightweight thin-walled structural parts for automobiles according to claim 7, characterized in that: The lower surface of the sealing plate is provided with an annular groove, which is connected to the gas gathering groove. A sliding ring is elastically slidably connected in the annular groove. A sealing ring is fixedly connected to the bottom of the sliding ring. The sealing ring is made of fluororubber and has a buffer cavity inside.

9. The die-casting process for a lightweight thin-walled structural component for automobiles according to claim 8, using the die-casting equipment described in claim 1, characterized in that: Includes the following steps: S1. The upper mold is driven to move down along the slide bar and approach the lower mold by an external hydraulic device, and finally the upper mold and the lower mold coincide. S2. Inject molten aluminum into the cavity between the upper and lower molds through the injection hole on the lower mold, and then wait for it to cool down. S3. After cooling down, the upper mold is pulled up by hydraulic equipment to complete the mold demolding.

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