Self-lubricating aluminum plate processing stamping forming die

Abstract

This invention relates to the field of mechanical stamping equipment technology, specifically disclosing a self-lubricating aluminum sheet stamping die, including a lower die with a stamping cavity formed on the upper surface of its central part. A sliding rod is installed on the upper edge of the lower die, and an upper die is slidably mounted on the sliding rod. The die also includes a lubrication mechanism fixedly installed inside the edge of the upper die. In this self-lubricating aluminum sheet stamping die, as the upper die slides up and down along the sliding rod, a sponge tube absorbing lubricating oil continuously slides on the outer surface of the sliding rod to lubricate the sliding rod and the upper die. This achieves automatic lubrication of the equipment during reciprocating stamping operations, preventing excessive heat generated by friction between the upper die and the sliding rod after prolonged operation, and also preventing adhesion between the upper die and the sliding rod after prolonged shutdown, thus avoiding maintenance issues.

Description

Technical Field

[0001] This invention relates to the field of mechanical stamping equipment technology, specifically a self-lubricating aluminum plate processing stamping mold. Background Technology

[0002] Stamping dies are among the most widely used process equipment in sheet metal processing. Through the relative movement of the upper and lower dies mounted on a press, pressure is applied to the sheet metal placed between them, causing plastic deformation within the stamping cavity to obtain workpieces of specific shapes and sizes. In aluminum sheet stamping, due to aluminum's relatively soft texture, easily scratched surface, and large coefficient of thermal expansion, the guiding accuracy and lubrication condition of the die directly determine the surface quality, dimensional accuracy, and service life of the workpiece.

[0003] Existing aluminum sheet stamping dies still suffer from several shortcomings in lubrication: Firstly, traditional die lubrication relies primarily on operators periodically applying lubricating oil to the slide rod surface using an oil gun or brush. This manual lubrication method is not only labor-intensive and inefficient, but also prone to uneven or missed lubrication. During prolonged continuous stamping operations, if lubrication is not timely, the coefficient of friction between the slide rod and the upper die sleeve increases sharply, generating a large amount of heat, causing the sleeve to expand, jam, or even tear, severely affecting stamping accuracy and die life. Secondly, manually applied lubricating oil does not adhere firmly to the slide rod surface. Vibration during stamping and the reciprocating motion of the sleeve cause most of the lubricating oil to be scraped onto the die worktable or floor, resulting in significant waste of lubricating oil, contaminating the workpiece surface and working environment, and increasing cleaning burden. Furthermore, the lack of an effective mechanism for collecting and reusing excess oil keeps lubrication costs high. Third, when the stamping equipment is shut down for an extended period (such as at night or on holidays), the residual lubricating oil on the slide bar surface will gradually flow away under gravity, leaving an extremely thin or even completely dried oil film. This causes direct contact between the metal surfaces of the slide bar and the sleeve, which may result in slight cold welding adhesion under the influence of humidity or temperature differences. Upon restarting, a significant starting force is required to overcome this adhesion, easily causing scratches on the sleeve surface or the slide bar, severely affecting guiding accuracy and service life. Fourth, existing lubrication methods cannot automatically adjust the lubrication supply according to the actual working conditions of the mold (such as stamping frequency, stroke, and downtime), often resulting in over- or under-lubrication. Furthermore, traditional molds lack real-time sensing and quantitative indication of the oil film state on the slide bar surface, making it difficult for operators to accurately determine when to replenish lubricating oil. Operators often rely on experience, increasing the uncertainty of equipment maintenance. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a self-lubricating aluminum sheet stamping die, which solves the problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a self-lubricating aluminum plate stamping die, comprising a lower die, a stamping cavity formed on the upper surface of the middle part of the lower die, a slide rod mounted on the upper edge of the lower die, an upper die slidably mounted on the slide rod, and further comprising: a lubrication mechanism, the lubrication mechanism being fixedly installed inside the edge of the upper die; wherein the lubrication mechanism includes a lower mounting cavity, the lower mounting cavity being formed through the upper edge of the lower die, a collar being fixedly connected to the inner surface of the lower mounting cavity, wherein the collar has a through hole, and the collars are fixedly sleeved in pairs on the bottom outer surface of the same slide rod; an upper mounting cavity is formed through the upper edge of the upper die, a sleeve plate is fixedly connected to the inner surface of the upper mounting cavity, the sleeve plate is slidably sleeved on the slide rod, wherein the sleeve plates are arranged in pairs parallel within the same upper mounting cavity, and a sponge tube is fixedly connected to the side surface of the sleeve plates in the same group that are close to each other, wherein the inner surface of the sponge tube is attached to the outer surface of the slide rod.

[0006] According to one embodiment of the present invention, the slide rod is provided with a sliding groove, and the upper surface of the middle part of the sleeve is provided with a fitting groove, wherein the sleeve and the sliding groove on the slide rod slide and fit together through the fitting groove.

[0007] According to one embodiment of the present invention, an air pressure bladder is fixedly sleeved on the top of the slide groove, and a sliding ring is fixedly connected to the bottom of the air pressure bladder. The sliding ring is elastically slidably sleeved in the slide groove of the slide rod, and the air pressure bladder has an interface reserved at the top of the slide rod.

[0008] According to one embodiment of the present invention, a positioning tube is fixedly connected to the outer surface of the sponge tube, and the upper and lower ends of the positioning tube are respectively fixedly connected to the side surfaces of the same set of sleeves that are close to each other; a pressure frame is elastically slidably inserted through the positioning tube, and isolation plates are provided on the outer surfaces of both sides of the positioning tube. The isolation plates and the outer ends of the pressure frames are combined to form a ring structure. An expansion bladder is fixedly connected to the outer surface of the isolation plate. The expansion bladder is set in a ring shape, and the outer surface of the expansion bladder is simultaneously fixedly connected to the inner surface of the upper mounting cavity.

[0009] According to one embodiment of the present invention, the inflatable bladder has an interface reserved on the outer surface of the upper mold, wherein the interface reserved for the air pressure bladder and the interface reserved for the inflatable bladder are connected by a hose.

[0010] According to one embodiment of the present invention, the interior of the sleeve is hollow, wherein an installation ring is fixedly installed inside the sleeve, and an air pressure chamber is provided on the outer side of the installation ring. An elastic telescopic rod is fixedly connected through the wall of the installation ring, wherein the internal cavity of the elastic telescopic rod communicates with the air pressure chamber, and a sealing block is fixedly embedded at the output end of the elastic telescopic rod. The sealing block is arc-shaped, and four sealing blocks are fixedly spaced around the central axis of the installation ring.

[0011] According to one embodiment of the present invention, the two ends of the sealing block are elastically slidably connected to connecting rods, wherein four sealing blocks are combined into a ring shape by connecting rods, and the sealing blocks are arranged opposite to the fitting grooves on the sleeve.

[0012] According to one embodiment of the present invention, a telescopic ring is fixedly connected to one side surface of the sleeve disks that are far apart from each other, and a disk is fixedly connected to the end of the telescopic ring that is far away from the sleeve disks, i.e., the output end. The disk is magnetically attached to the slide rod, and a connecting pipe is passed through the outer surface of the telescopic ring. The internal cavity of the top telescopic ring is connected to the air pressure chamber of the bottom sleeve disk through the connecting pipe, and the internal cavity of the bottom telescopic ring is connected to the air pressure chamber of the top sleeve disk through the connecting pipe.

[0013] According to one embodiment of the present invention, the maximum expansion height of the top disk through the telescopic ring does not exceed the height of the upper mounting cavity, and the bottom disk, after the maximum contraction height through the telescopic ring, still protrudes from the bottom upper mounting cavity.

[0014] When this equipment is needed, the aluminum plate to be stamped is placed in the stamping cavity of the lower mold. Then, the upper mold is pressed down along the slide bar by the external hydraulic equipment to perform the stamping. After the stamping operation is completed, the upper mold is pulled up along the slide bar by the hydraulic equipment again to remove the stamped aluminum plate.

[0015] (III) Beneficial Effects This invention provides a self-lubricating aluminum sheet stamping die. It has the following beneficial effects: (I) This self-lubricating aluminum plate processing stamping die, when the upper die slides up and down along the slide rod, the sponge tube that absorbs lubricating oil slides continuously on the outer surface of the slide rod to complete the lubrication of the slide rod and the upper die. This achieves automatic lubrication of the equipment when the equipment moves back and forth for stamping, avoiding excessive heat generated by friction between the upper die and the slide rod after long-term operation, and also avoiding the problem of adhesion between the upper die and the slide rod after long-term shutdown, which would require maintenance.

[0016] (II) In the normal lubrication stage of this self-lubricating aluminum plate stamping die, excess lubricating oil on the slide rod will flow along the slide rod to the lower mounting cavity of the lower die, and then leak downward through the collar of the lower mounting cavity, and finally be collected at the bottom of the lower die, realizing the collection of excess lubricating oil and avoiding the problem of lubricating oil spilling everywhere and being difficult to clean. After the upper die moves up to a certain distance, it will gradually contact the sliding ring at the top of the slide rod and squeeze it, thereby squeezing the air bladder, so that the air bladder will transfer its internal air pressure to the expansion bladder in the upper mounting cavity, thereby causing the expansion bladder to expand. Then, through the expansion of the expansion bladder, the pressure frame is squeezed into the positioning tube, that is, the sponge tube is squeezed, and the lubricating oil in the sponge tube is further squeezed to soak the lubricating rod, avoiding the problem of reduced lubricating oil on the side of the sponge tube close to the slide rod after long-term use, thus reducing the lubrication effect.

[0017] (III) In this self-lubricating aluminum plate stamping die, when the upper die moves upward, the telescopic ring is first squeezed by the sleeve plate. At this time, the disk initially adheres to the slide rod and does not move, that is, the telescopic ring is squeezed and contracted. As the telescopic ring is squeezed to the point that it can no longer contract, it begins to drive the upper disk to overcome the magnetic force and move synchronously upward along the slide rod. At this time, the lower telescopic ring is stretched to its maximum due to the adsorption of the lower disk, and after the lower telescopic ring can no longer expand, it synchronously pulls the lower disk upward. After the upper telescopic ring is squeezed, it will deliver its internal air pressure. The air pressure increases in the air chamber of the bottom sleeve, causing the elastic telescopic rod to expand. This, in turn, pushes the sealing block in the lower sleeve to contract, ultimately closing the fitting groove of the lower sleeve. During this process, the fitting groove of the upper sleeve is opened. Conversely, when the upper mold moves down, the fitting groove of the upper sleeve closes, and the fitting groove of the lower sleeve opens. This ensures that the tail end of the upper mold is always closed during its reciprocating movement, allowing the lubricating oil to be better retained in the sponge tube and preventing excess oil from flowing at the slide rod. The lubricating oil is scraped in large quantities by the sleeve disc into the lower mounting cavity at the bottom, thus significantly extending the working time after one lubricating oil addition and avoiding lubricating oil waste. It also prevents the spread of lubricating oil caused by excessive injection into the lower mounting cavity, further improving the working stability of the equipment. When the upper mold moves to the top of the slide rod and the sponge tube is squeezed, the fitting groove on the bottom sleeve disc is closed. This allows excess lubricating oil to flow through the fitting groove of the top sleeve disc to the top of the upper disk, i.e., the top of the upper mounting cavity. This provides a quantitative indication for the operator, reminding them to add lubricating oil in time when it is insufficient, greatly improving convenience. Adding lubricating oil only requires pouring it to the top of the upper mounting cavity when the upper mold moves to the top; it is automatically absorbed by the sponge tube through the fitting groove. When the upper mold moves down, it fully wets the slide rod, and excess lubricating oil flows downwards on the slide rod, significantly improving lubrication. It is completely absorbed each time the upper mold moves up again, preventing waste. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the collar of the present invention; Figure 3 This is a schematic diagram of the internal structure of the mounting cavity in this invention; Figure 4 This is a schematic diagram of the installation structure of the sleeve disc of the present invention; Figure 5 This is a schematic diagram of the sponge tube and its connection structure of the present invention; Figure 6 This is a schematic diagram of the pressure frame of the present invention; Figure 7 This is a schematic diagram of the internal structure of the sleeve of the present invention; Figure 8 This is a schematic diagram of the mounting ring structure of the present invention.

[0019] In the diagram: 1. Lower mold; 2. Stamping cavity; 3. Slide rod; 4. Upper mold; 5. Lubrication mechanism; 51. Lower mounting cavity; 52. Collar; 53. Upper mounting cavity; 54. Sleeve disc; 55. Sponge tube; 56. Slide groove; 57. Fitting groove; 58. Air pressure bladder; 59. Sliding ring; 510. Positioning tube; 511. Pressure frame; 512. Isolation plate; 513. Expansion bladder; 514. Mounting ring; 515. Air pressure cavity; 516. Elastic telescopic rod; 517. Sealing block; 518. Connecting rod; 519. Telescopic ring; 520. Disk; 521. Connecting tube. Detailed Implementation

[0020] 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.

[0021] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: a self-lubricating aluminum plate processing stamping die, including a lower die 1, a stamping cavity 2 formed on the upper surface of the middle part of the lower die 1, a slide rod 3 installed on the upper edge of the lower die 1, an upper die 4 slidably disposed on the slide rod 3, and further comprising: Lubrication mechanism 5 is fixedly installed inside the edge of the upper mold 4; The lubrication mechanism 5 includes a lower mounting cavity 51, which is opened through the upper surface of the edge of the lower mold 1. A collar 52 is fixedly connected to the inner surface of the lower mounting cavity 51. A through hole is reserved in the collar 52, and the collars 52 are fixedly sleeved on the bottom outer surface of the same slide rod 3 in pairs. An upper mounting cavity 53 is provided through the upper edge surface of the upper mold 4. A sleeve 54 is fixedly connected to the inner surface of the upper mounting cavity 53. The sleeve 54 is slidably sleeved on the slide rod 3. The sleeves 54 are arranged in pairs in parallel within the same upper mounting cavity 53. A sponge tube 55 is fixedly connected to the side surface of the sleeves 54 in the same group that are close to each other. The inner surface of the sponge tube 55 is attached to the outer surface of the slide rod 3.

[0022] The slide bar 3 has a slide groove 56, and the upper surface of the middle part of the sleeve 54 has a fitting groove 57, wherein the sleeve 54 and the slide bar 3 slide and fit together through the fitting groove 57 and the slide groove 56.

[0023] An air pressure bladder 58 is fixedly sleeved on the top of the slide groove 56, and a sliding ring 59 is fixedly connected to the bottom of the air pressure bladder 58. The sliding ring 59 is elastically slidably sleeved in the slide groove 56 of the slide rod 3, and the air pressure bladder 58 has a reserved interface at the top of the slide rod 3.

[0024] A positioning tube 510 is fixedly connected to the outer surface of the sponge tube 55. The upper and lower ends of the positioning tube 510 are respectively fixedly connected to the surface of the same set of sleeves 54 that are close to each other. A pressure frame 511 is elastically slidably inserted through the positioning tube 510. Isolation plates 512 are provided on the outer surfaces of both sides of the positioning tube 510. The isolation plates 512 and the outer ends of the pressure frame 511 are combined to form a ring structure. An expansion bladder 513 is fixedly connected to the outer surface of the isolation plate 512. The expansion bladder 513 is set in a ring shape. The outer surface of the expansion bladder 513 is also fixedly connected to the inner surface of the upper mounting cavity 53.

[0025] The expansion bladder 513 has an interface reserved on the outer surface of the upper mold 4, and the interface reserved in the air pressure bladder 58 is connected to the interface reserved in the expansion bladder 513 through a hose.

[0026] The interior of the sleeve 54 is hollow, and an installation ring 514 is fixedly installed inside the sleeve 54. An air pressure chamber 515 is provided on the outer side of the installation ring 514. An elastic telescopic rod 516 is fixedly connected through the wall of the installation ring 514. The internal cavity of the elastic telescopic rod 516 is connected to the air pressure chamber 515. A sealing block 517 is fixedly embedded at the output end of the elastic telescopic rod 516. The sealing block 517 is arc-shaped and four sealing blocks 517 are fixedly spaced around the central axis of the installation ring 514.

[0027] The sealing block 517 has a connecting rod 518 that is elastically slidably inserted at both ends. Four sealing blocks 517 are combined into a ring shape by the connecting rod 518. At the same time, the sealing block 517 is positioned opposite the fitting groove 57 on the sleeve 54.

[0028] A telescopic ring 519 is fixedly connected to one side of the sleeve 54 that is far from each other. A disk 520 is fixedly connected to the end of the telescopic ring 519 that is far from the sleeve 54, i.e., the output end. The disk 520 is magnetically attached to the slide rod 3. A connecting pipe 521 is connected through the outer surface of the telescopic ring 519. The internal cavity of the top telescopic ring 519 is connected to the air pressure chamber 515 of the bottom sleeve 54 through the connecting pipe 521. At the same time, the internal cavity of the bottom telescopic ring 519 is connected to the air pressure chamber 515 of the top sleeve 54 through the connecting pipe 521.

[0029] The maximum expansion height of the top disk 520 via the telescopic ring 519 does not exceed the height of the upper mounting cavity 53, and the bottom disk, after its maximum contraction height via the telescopic ring 519, still protrudes from the bottom upper mounting cavity 53.

[0030] During operation, when the equipment is needed, the aluminum sheet to be stamped is placed in the stamping cavity 2 of the lower die 1. Then, the upper die 4 is pressed down along the slide rod 3 by an external hydraulic device to perform the stamping. After the stamping operation is completed, the upper die 4 is pulled up along the slide rod 3 by the hydraulic device again to remove the stamped aluminum sheet. As the upper die 4 slides up and down along the slide rod 3, the sponge tube 55, which absorbs lubricating oil, slides continuously on the outer surface of the slide rod 3 to lubricate the slide rod 3 and the upper die 4. This achieves automatic lubrication of the equipment during the reciprocating stamping process, avoiding excessive heat generated by friction between the upper die 4 and the slide rod 3 after long-term operation, and also preventing the upper die 4 and the slide rod 3 from sticking together after long-term shutdown, which would require maintenance. During normal lubrication, excess lubricating oil on the slide rod 3 flows along the slide rod 3 into the lower mounting cavity 51 of the lower mold 1, and leaks downwards through the collar 52 of the lower mounting cavity 51, eventually being collected at the bottom of the lower mold 1. This process collects excess lubricating oil and avoids the problem of lubricating oil spilling everywhere and being difficult to clean. After the upper mold 4 moves up a certain distance, it gradually contacts and squeezes the sliding ring 59 at the top of the slide rod 3, thereby squeezing the air pressure bladder 58. This causes the air pressure bladder 58 to transfer its internal air pressure to the expansion bladder 513 in the upper mounting cavity 53, causing the expansion bladder 513 to expand. The expansion of the expansion bladder 513 then squeezes the pressure frame 511 into the positioning tube 510, thus beginning the process of pressing the sponge tube 55. The compression process further squeezes the lubricating oil inside the sponge tube 55 into the lubricating rod 3, preventing the lubricating oil on the side of the sponge tube 55 close to the slide rod 3 from decreasing and reducing the lubrication effect after prolonged use. When the upper mold 4 moves upward, it first compresses the telescopic ring 519 through the sleeve 54. At this time, the disk 520 initially adheres to the slide rod 3 and does not move, meaning the telescopic ring 519 is compressed and contracted. As the telescopic ring 519 is compressed to its limit, it begins to drive the upper disk 520 to overcome the magnetic force and move synchronously upward along the slide rod 3. Meanwhile, the lower telescopic ring 519 is stretched to its maximum due to the adsorption of the lower disk 520. When the lower telescopic ring 519 can no longer expand, it synchronously pulls the lower disk upward. After the upper telescopic ring 519 is compressed, it will... The internal air pressure is supplied to the air pressure chamber 515 in the bottom sleeve 54, increasing the air pressure in the air pressure chamber 515. This causes the elastic telescopic rod 516 to expand using air pressure, which in turn pushes the sealing block 517 in the lower sleeve 54 to contract, ultimately closing the fitting groove 57 of the lower sleeve 54. During this process, the fitting groove 57 of the upper sleeve 54 is opened. Conversely, when the upper mold 4 moves down, the fitting groove 57 of the upper sleeve 54 closes, and the fitting groove 57 of the lower sleeve 54 opens. This ensures that the sleeve 54 at the rear end of the upper mold 4 is always closed when it reciprocates, allowing the lubricating oil to be better retained in the sponge tube 55. This prevents excess lubricating oil at the slide rod 3 from being scraped away by the sleeve 54 into the lower mounting cavity 51 at the bottom.This significantly extends the working time after adding lubricating oil once, avoids lubricating oil waste, and prevents the spread of excessive lubricating oil in the lower mounting cavity 51 due to insufficient drainage, further improving the working stability of the equipment. When the upper mold 4 moves to the top of the slide bar 3 and the sponge tube 55 is squeezed, since the fitting groove 57 on the bottom sleeve 54 is closed at this time, excess lubricating oil from the squeezing of the sponge tube 55 flows through the fitting groove 57 of the top sleeve 54 to the top of the upper disk 520, thus existing in the upper mounting cavity 53. The top of the device provides quantitative indicators for staff to remind them to add lubricating oil in time when it is insufficient, greatly improving convenience. When adding lubricating oil, simply pour it onto the top of the upper mounting cavity 53 when the upper mold 4 moves to the top. The lubricating oil will be automatically absorbed by the sponge tube 55 through the fitting groove 57. Furthermore, as the upper mold 4 moves down, it fully wets the slide rod 3. Excess lubricating oil flows downwards on the slide rod 3, significantly improving its lubrication. The lubricating oil is completely absorbed each time the upper mold 4 moves up again, preventing waste.

[0031] 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.

[0032] 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 self-lubricating aluminum plate processing press forming die comprising a lower die, characterized by: The lower die has a stamping cavity on its upper central surface, and a slide rod is installed on the upper edge of the lower die. The upper die is slidably mounted on the slide rod. The lower die also includes: The lubrication mechanism is fixedly installed inside the edge of the upper mold; The lubrication mechanism includes a lower mounting cavity, which is opened through the upper surface of the edge of the lower mold. A collar is fixedly connected to the inner surface of the lower mounting cavity, wherein a through hole is reserved in the collar, and the collars are fixedly sleeved on the bottom outer surface of the same slide rod in pairs. An upper mounting cavity is formed through the upper edge surface of the upper mold. A sleeve is fixedly connected to the inner surface of the upper mounting cavity. The sleeve is slidably sleeved on the slide rod. The sleeves are arranged in pairs in the same upper mounting cavity. A sponge tube is fixedly connected to the side surface of the sleeves in the same group that are close to each other. The inner surface of the sponge tube is attached to the outer surface of the slide rod.

2. The self-lubricating aluminum plate processing stamping forming die according to claim 1, characterized in that: The slide rod has a sliding groove, and the upper surface of the middle part of the sleeve has a fitting groove, wherein the sleeve slides and fits into each other through the fitting groove and the sliding groove on the slide rod.

3. The self-lubricating aluminum plate processing press forming die according to claim 2, characterized in that: An air pressure bladder is fixedly sleeved at the top of the slide groove, and a sliding ring is fixedly connected to the bottom of the air pressure bladder. The sliding ring is elastically slidably sleeved in the slide groove of the slide rod, and the air pressure bladder has a reserved interface at the top of the slide rod.

4. The self-lubricating aluminum plate processing stamping forming die according to claim 3, characterized in that: A positioning tube is fixedly connected to the outer surface of the sponge tube, and the upper and lower ends of the positioning tube are respectively fixedly connected to the surface of the same set of sleeves that are close to each other. A pressure frame is elastically slidably inserted through the positioning tube. Isolation plates are provided on the outer surfaces of both sides of the positioning tube. The isolation plates and the outer ends of the pressure frame are combined to form a ring structure. An expansion bladder is fixedly connected to the outer surface of the isolation plate. The expansion bladder is ring-shaped. The outer surface of the expansion bladder is also fixedly connected to the inner surface of the upper mounting cavity.

5. The self-lubricating aluminum plate processing press forming die according to claim 4, characterized in that: The expansion bladder has an interface pre-reserved on the outer surface of the upper mold, and the interface reserved for the air pressure bladder and the interface reserved for the expansion bladder are connected by a hose.

6. The self-lubricating aluminum plate processing press forming die according to claim 5, characterized in that: The interior of the sleeve is hollow, and an installation ring is fixedly installed inside the sleeve. An air pressure chamber is provided on the outer side of the installation ring. An elastic telescopic rod is fixedly connected through the wall of the installation ring. The internal cavity of the elastic telescopic rod is connected to the air pressure chamber. A sealing block is fixedly embedded at the output end of the elastic telescopic rod. The sealing block is arc-shaped and four sealing blocks are fixedly spaced around the central axis of the installation ring.

7. The self-lubricating aluminum plate processing press forming die according to claim 6, characterized in that: The sealing blocks are elastically slidably connected to connecting rods at both ends, and four sealing blocks are combined into a ring shape by connecting rods. At the same time, the sealing blocks are positioned opposite the fitting grooves on the sleeve.

8. The self-lubricating aluminum plate processing press forming die according to claim 7, characterized in that: A telescopic ring is fixedly connected to one side of the sleeve disk that is far from each other. A disk is fixedly connected to the end of the telescopic ring that is far from the sleeve disk, i.e., the output end. The disk is magnetically attached to the slide rod. A connecting pipe is penetrating the outer surface of the telescopic ring. The internal cavity of the top telescopic ring is connected to the air pressure chamber of the bottom sleeve disk through the connecting pipe. At the same time, the internal cavity of the bottom telescopic ring is connected to the air pressure chamber of the top sleeve disk through the connecting pipe.

9. The self-lubricating aluminum plate processing press forming die according to claim 8, characterized in that: The maximum expansion height of the disk at the top through the telescopic ring shall not exceed the height of the upper mounting cavity, and the disk at the bottom, after its maximum contraction height through the telescopic ring, shall still protrude from the bottom upper mounting cavity.

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