A stable hydraulic cold pressing device and method for full-aluminum door panel composite pressing

Abstract

The application discloses a kind of full aluminum door panel composite pressure use steady hydraulic pressure cold pressing device and method, including equipment base rack, the equipment base rack inside center is provided with lower pressure workbench plate, the lower pressure workbench plate four around outer side is equipped with four groups of guide columns, the guide column bottom end fixed column base, the column base is fixedly connected on equipment base rack top surface four corners, the guide column outer side sliding sleeve is connected with upper sliding pressing crossbeam, the upper sliding pressing crossbeam bottom surface is attached with flexible buffer silica gel pressure pad, the upper sliding pressing crossbeam top surface center is fixed with main hydraulic cylinder, the present application is formed by relying on hydraulic oil supply structure cooperation energy storage cavity closed loop steady oil circuit, cooperate magnetic attraction limit structure fixed aluminum door panel, column guide crossbeam vertical pressing, spring automatic reset, supporting process real-time acquisition oil pressure automatic pressure regulating, realize aluminum plate no scratch, pressing pressure constant, production efficiency is improved, reduce door panel deformation and degumming scrap.

Description

Technical Field

[0001] This invention relates to the field of all-aluminum door processing equipment technology, specifically to a pressure-stabilizing hydraulic cold pressing device and method for composite pressing of all-aluminum door panels. Background Technology

[0002] All-aluminum door panels are made of seamless welded aluminum profile frames, UV-printed aluminum decorative panels, and aluminum honeycomb core materials bonded together with environmentally friendly adhesives. The industry commonly uses ordinary hydraulic cold presses to complete the cold pressing and bonding process. However, existing general-purpose cold presses are primarily designed for wood-based panels, and therefore have four core defects in the processing of all-aluminum door panels: Traditional cold presses rely solely on a single cylinder for direct oil pressure supply, without an independent pressure-stabilizing and energy-storing oil circuit. During the pressing process, slight leakage from the cylinder and minor compression of the aluminum honeycomb panel cause a continuous decrease in oil pressure. The high rigidity of the all-aluminum sheet and the thinness of the decorative panel make it easy for the pressure to fluctuate, resulting in surface dents, collapse of the aluminum honeycomb core, and uneven thickness of the adhesive layer between the sheets. Ultimately, this leads to door panel delamination, edge delamination, and a high rate of product scrap.

[0003] Conventional cold presses are only equipped with simple fixed blocks and lack a magnetic positioning structure suitable for smooth aluminum sheets. During pressing, the aluminum decorative panels are prone to lateral and longitudinal slippage. If rigid clamps are used for clamping and fixing, the UV-printed paint surface will be scratched and the edges and corners of the aluminum profiles will be bumped, which cannot meet the high appearance requirements of the all-aluminum door panel processing standards.

[0004] Traditional cold presses rely entirely on manual rotation of the regulating valve for oil pressure adjustment. There is no real-time pressure acquisition or electronic closed-loop feedback structure. When changing door panels of different thicknesses and honeycomb filling densities, operators need to repeatedly test and adjust the oil pressure. The pressure matching consistency is poor, the debugging is time-consuming, and the overall processing efficiency of the production line is low.

[0005] Conventional cold presses on the market have scattered hydraulic pipelines without integrated pressure stabilization circuits. The machines have a large number of parts, making 3D modeling, sheet metal processing, and subsequent pipeline inspection and maintenance difficult. At the same time, they lack dedicated processes for segmented pressure stabilization and graded pressure relief to match the pressure stabilization equipment. They only use a single constant-duration pressurization mode, which cannot meet the process requirements of uniform bonding of multi-layer aluminum composite panels. Summary of the Invention

[0006] The purpose of this invention is to provide a pressure-stabilized hydraulic cold pressing device and method for composite pressing of all-aluminum door panels, so as to solve the problems mentioned in the background art, such as door panel deformation and delamination caused by oil pressure decay, easy slippage and scratching of aluminum sheet positioning, poor consistency of manual pressure adjustment, complex equipment structure and lack of supporting pressure-stabilized pressing process.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels, comprising a base frame, a lower pressure-bearing worktable centrally located inside the base frame, four sets of guide columns surrounding the lower pressure-bearing worktable, a column base fixed to the bottom of each guide column, the column base being fixed to the four corners of the top surface of the base frame, an upper sliding pressing beam slidably connected to the outer side of each guide column, a flexible buffer silicone pad affixed to the bottom surface of the upper sliding pressing beam, a main hydraulic cylinder fixed at the center of the top surface of the upper sliding pressing beam, the bottom of the main hydraulic cylinder being connected to a high-pressure oil supply main pipe, the bottom end of the high-pressure oil supply main pipe being connected to a hydraulic oil supply tank, the hydraulic oil supply tank being located on the left rear side inside the base frame, and the front of the hydraulic oil supply tank... A pressure relief manual valve is installed on the outer wall of the end. The side wall of the main hydraulic cylinder is connected to a pressure-stabilizing parallel branch pipe. The end of the pressure-stabilizing parallel branch pipe is connected to a pressure-stabilizing energy storage chamber. The end of the pressure-stabilizing energy storage chamber is connected to an electromagnetic proportional pressure regulating valve through a pressure regulating connecting short pipe. A pressure measuring branch pipe is connected to the bottom of the electromagnetic proportional pressure regulating valve. A pressure sensor is installed at the lower end of the pressure measuring branch pipe. A signal connection line is led out from the pressure sensor. The end of the signal connection line is connected to the CNC control panel. The CNC control panel is fixed to the right front outer side of the equipment base frame. A column protective shell is fitted on the outer wall of the guide column. Return buffer springs are installed between the four corners of the upper sliding pressing crossbeam and the four corners of the equipment base frame. Aluminum profile limit blocks are arranged on the top edge of the lower pressure-bearing worktable. Workpiece positioning magnetic blocks are evenly distributed on the surface of the lower pressure-bearing worktable.

[0008] Furthermore, the guide column consists of four cylindrical components of equal diameter. The guide column is arranged in a rectangular array on the top surface of the equipment base frame, relying on the column base. The column base and the bottom of the guide column are integrally welded together.

[0009] Furthermore, through-holes are provided at the four corners of the upper sliding pressing beam, and the through-holes are respectively fitted onto the outside of the four guide columns.

[0010] Furthermore, the pressure-stabilizing parallel branch pipe is arranged in a horizontal direction, and its two ends are respectively connected to the oil port on the side wall of the main hydraulic cylinder and the sealing flange at the left end of the pressure-stabilizing energy storage chamber. The pressure-stabilizing energy storage chamber and the main hydraulic cylinder are connected in parallel through the pressure-stabilizing parallel branch pipe.

[0011] Furthermore, the pressure measuring branch pipe is arranged vertically, and its upper and lower ends are respectively sealed and connected to the bottom three-way port of the electromagnetic proportional pressure regulating valve and the top interface of the pressure sensor.

[0012] Furthermore, the aluminum profile limiting block is an L-shaped block structure, and the aluminum profile limiting block is detachably snapped onto the perimeter of the lower pressure worktable. The workpiece positioning magnetic block is embedded and fixed inside the surface of the lower pressure worktable, and the top surface of the workpiece positioning magnetic block is flush with the top surface of the lower pressure worktable.

[0013] Furthermore, the number of return buffer springs corresponds one-to-one with the number of guide columns. The upper hook of the return buffer spring is connected to the four corners of the bottom of the sliding pressing crossbeam, and the lower hook of the return buffer spring is connected to the fixed point on the outside of the column base.

[0014] This invention provides a composite pressing method based on the aforementioned pressure-stabilized hydraulic cold pressing device for composite pressing of all-aluminum door panels, comprising the following complete operation steps: S1. Workpiece layering and positioning: The seamless welded aluminum profile frame, UV-printed aluminum decorative panel, and aluminum honeycomb core material are stacked sequentially on the top surface of the lower pressure worktable. The aluminum profile limiting blocks around the lower pressure worktable are moved to fit the four sides of the aluminum door panel to complete the horizontal and vertical limiting. The workpiece positioning magnetic block on the surface of the lower pressure worktable is activated, and the bottom surface of the aluminum decorative panel is attracted by magnetic force to limit the horizontal sliding of the aluminum sheet and complete the clamping-free and non-destructive positioning. S2. Input and storage of working parameters: The operator operates the CNC control panel on the right front outside of the equipment and inputs three sets of process parameters, namely, target stabilizing pressure, pressure holding time, and pressure release buffer time, according to the thickness of the aluminum door panel to be processed, the density of aluminum honeycomb filling, and the type of adhesive. The CNC control panel simultaneously opens the pressure signal receiving channel and waits for the pressure sensor to transmit real-time pressure data of the oil circuit. S3, Oil supply downward pressurization: Start the equipment oil supply program. The hydraulic oil in the hydraulic oil supply tank is transported upward to the main hydraulic cylinder through the high-pressure oil supply main pipe. The piston rod of the main hydraulic cylinder extends downward, driving the upper sliding pressing beam to slide vertically downward along the four guide columns. The flexible buffer silicone pad on the bottom surface of the upper sliding pressing beam slowly adheres to the upper surface of the all-aluminum door panel, applying initial pressure to the multi-layer aluminum composite panel. The high-pressure oil in the main hydraulic cylinder is simultaneously transported to the pressure-stabilizing energy storage chamber through the pressure-stabilizing parallel branch pipe to complete the oil storage. S4. Closed-loop pressure stabilization and continuous pressure holding: The oil pressure is transmitted to the electromagnetic proportional pressure regulating valve through the pressure regulating connection short pipe. The pressure measuring branch pipe at the bottom of the electromagnetic proportional pressure regulating valve transmits the oil pressure to the pressure sensor. The pressure sensor collects the oil pressure value in real time and continuously transmits it to the CNC control panel through the signal connection line. The CNC control panel compares the real-time oil pressure with the preset pressure stabilization threshold and automatically adjusts the opening of the electromagnetic proportional pressure regulating valve. When the oil pressure decreases, the pressure stabilization energy storage chamber releases the reserve oil to compensate for the oil pressure, maintaining a constant pressure throughout the process and continuously holding the pressure for the preset duration, so that the adhesive layers of the aluminum door panel are evenly filled and bonded. S5, graded pressure relief beam lifting: After the pressure holding process is completed, the CNC control panel sends a pressure relief command to the electromagnetic proportional pressure regulating valve for initial pressure relief. The operator rotates the pressure relief manual valve at the front end of the hydraulic oil supply tank to complete the complete pressure relief of the system. After the oil pressure in the oil circuit drops, the four return buffer springs pull the upper sliding pressing beam upward along the guide column to reset by their own elastic tension. The flexible buffer silicone pad is removed from the surface of the aluminum door panel. S6. Finished product unloading and workpiece replacement: Turn off the magnetic attraction function of the workpiece positioning magnetic block, release the adsorption constraint on the bottom surface of the aluminum sheet, take out the composite aluminum door panel in the horizontal direction along the lower pressure workbench, clean the residual adhesive on the workbench surface, re-lay the next set of aluminum door panels to be pressed, and repeat the S1 to S5 process for continuous production.

[0015] Furthermore, in the S4 closed-loop pressure stabilization and continuous pressure holding step, when the pressure sensor detects that the real-time oil pressure is lower than the stabilization threshold entered by the CNC control panel, the CNC control panel controls the electromagnetic proportional pressure regulating valve to reduce the return oil opening, and the hydraulic oil stored in the pressure stabilization and energy storage chamber flows back into the main hydraulic cylinder to compensate for the pressure. When the pressure sensor detects that the real-time oil pressure is higher than the preset stabilization threshold, the CNC control panel controls the electromagnetic proportional pressure regulating valve to increase the return oil opening, and the excess hydraulic oil flows back to the hydraulic oil supply tank, thus performing dynamic closed-loop pressure stabilization and regulation throughout the entire process.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The hydraulic oil supply tank supplies oil to the main hydraulic cylinder through the high-pressure oil supply main pipe. The main hydraulic cylinder is connected to the pressure-stabilizing energy storage chamber through the pressure-stabilizing parallel branch pipe. The pressure sensor collects the oil circuit pressure in real time through the pressure measuring branch pipe and transmits it to the CNC control panel through the signal connection line. The CNC control panel automatically adjusts the opening of the electromagnetic proportional pressure regulating valve. When the pressure is insufficient, the pressure-stabilizing energy storage chamber releases oil to replenish the pressure. When the pressure is too high, the excess oil flows back to the hydraulic oil supply tank. The oil pressure is stable throughout the pressing process, eliminating the problems of oil pressure decay and instantaneous high pressure in traditional equipment. This avoids the denting of the all-aluminum decorative panel, the collapse of the aluminum honeycomb core, and the uneven thickness of the adhesive layer, and significantly reduces the door panel delamination and delamination scrap rate. L-shaped aluminum profile limiting blocks can be detachably installed around the four edges of the lower pressure worktable to mechanically limit the door panel from all four sides. The worktable surface is embedded with a workpiece positioning magnetic block, the top surface of which is flush with the worktable. The smooth aluminum door panel is attracted from the bottom by magnetic force, eliminating the need for rigid clamps. The double constraint prevents the aluminum door panel from sliding horizontally during pressing. There is no hard clamp contact with the UV-printed aluminum panel, avoiding scratches on the paint surface and bumps on the edges of the aluminum profile, thus meeting the high appearance processing standards of the all-aluminum door panel.

[0017] Four guide columns are fixed to the four corners of the equipment base frame via rectangular column bases. The upper sliding pressing beam slides on the outside of the guide columns at the four corners, allowing only vertical and stable sliding. The return buffer spring connects the upper sliding pressing beam to the column base. When pressed down, the spring stores energy, and after pressure release, it automatically pulls the beam up. The supporting process automatically adjusts the pressure based on preset parameters on the CNC control panel, eliminating the need for repeated manual adjustment of the hydraulic pressure. The beam remains parallel and straight throughout the pressing process, and the workpiece can be automatically lifted without reverse oil supply from the hydraulic cylinder, shortening the single pressing cycle time. Switching between different specifications of all-aluminum door panels can be done without repeated manual valve adjustments, reducing the intensity of manual operation and significantly improving the overall processing efficiency of the production line. Attached Figure Description

[0018] Figure 1 This is a top view of the present invention; Figure 2 This is a right-side plan view of the present invention; Figure 3 This is a front view diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the present invention; Figure 5 This is a side view of the three-dimensional structure of the present invention; Figure 6 This is a three-dimensional view of a partial structure of the present invention.

[0019] In the diagram: 1. Equipment base frame; 2. Lower pressure-bearing worktable; 3. Guide column; 4. Upper sliding pressing beam; 5. Main hydraulic cylinder; 6. Pressure-stabilizing and energy-storing oil storage chamber; 7. Electromagnetic proportional pressure regulating valve; 8. Pressure sensor; 9. CNC control panel; 10. Aluminum profile limit block; 11. Flexible buffer silicone pad; 12. Hydraulic oil supply tank; 13. Return buffer spring; 14. Workpiece positioning magnetic block; 15. Pressure relief manual valve; 16. High-pressure oil supply main pipe; 17. Pressure-stabilizing parallel branch pipe; 18. Pressure regulating connecting short pipe; 19. Pressure measuring branch pipe; 20. Signal connection cable; 21. Column protective shell; 22. Column base. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-6This invention provides a pressure-stabilizing hydraulic cold pressing device and method for composite pressing of all-aluminum door panels, including a base frame 1. A lower pressure-bearing worktable 2 is centrally located inside the base frame 1. Four sets of guide columns 3 are arranged around the outer perimeter of the lower pressure-bearing worktable 2. Column bases 22 are fixed to the bottom ends of the guide columns 3 and are fixed to the four corners of the top surface of the base frame 1. An upper sliding pressing beam 4 is slidably connected to the outer side of the guide columns 3. A flexible buffer silicone pad 11 is attached to the bottom surface of the upper sliding pressing beam 4. A main hydraulic cylinder 5 is fixed to the center of the top surface of the upper sliding pressing beam 4. The bottom of the main hydraulic cylinder 5 is connected to a high-pressure oil supply main pipe 16. The bottom end of the high-pressure oil supply main pipe 16 is connected to a hydraulic oil supply tank 12. The hydraulic oil supply tank 12 is located on the base frame 1. Inside the frame 1, on the left rear side, a pressure relief manual valve 15 is installed on the outer wall of the front end of the hydraulic oil tank 12. The side wall of the main hydraulic cylinder 5 is connected to a pressure stabilizing parallel branch pipe 17. The end of the pressure stabilizing parallel branch pipe 17 is connected to a pressure stabilizing energy storage chamber 6. The end of the pressure stabilizing energy storage chamber 6 is connected to an electromagnetic proportional pressure regulating valve 7 through a pressure regulating connecting short pipe 18. A pressure measuring branch pipe 19 is connected to the bottom of the electromagnetic proportional pressure regulating valve 7. A pressure sensor 8 is installed at the lower end of the pressure measuring branch pipe 19. A signal connection line 20 is led out from the pressure sensor 8. The end of the signal connection line 20 is connected to the CNC control panel 9. The CNC control panel 9 is fixed to the right front outer side of the equipment base frame 1. A column protective shell 21 is fitted on the outer wall of the guide column 3. Return buffer springs are installed between the four corners of the upper sliding pressing crossbeam 4 and the four corners of the equipment base frame 1. Spring 13, aluminum profile limiting blocks 10 are arranged on the top edge of the lower pressure worktable 2, and workpiece positioning magnetic blocks 14 are evenly distributed on the surface of the lower pressure worktable 2; specifically: the equipment base frame 1 serves as the load-bearing base of the whole machine, the lower pressure worktable 2 is centrally installed inside the equipment base frame 1 to place the all-aluminum door panel; four guide columns 3 are fixed to the four corners of the top surface of the equipment base frame 1 by the column base 22, and the column protective shell 21 covers the outer wall of the guide column 3 for protection; the upper sliding pressing beam 4 is slidably sleeved on the outside of the guide column 3, the flexible buffer silicone pad 11 on the bottom surface of the upper sliding pressing beam 4 is used to contact the door panel to disperse pressure, and the main hydraulic cylinder 5 at the center of the top surface of the upper sliding pressing beam 4 provides the downward pressing power; hydraulic oil supply Hydraulic oil in tank 12 is delivered to main hydraulic cylinder 5 via high-pressure oil supply main pipe 16. The pressure relief manual valve 15 on the outside of hydraulic oil supply tank 12 is used for depressurization of the whole machine. The side wall of main hydraulic cylinder 5 is connected to pressure stabilizing energy storage chamber 6 through pressure stabilizing parallel branch pipe 17 to realize oil pressure reserve compensation. Pressure stabilizing energy storage chamber 6 is connected to electromagnetic proportional pressure regulating valve 7 through pressure regulating connection short pipe 18. The bottom of electromagnetic proportional pressure regulating valve 7 is connected to pressure sensor 8 through pressure measuring branch pipe 19 to collect real-time oil pressure. Pressure sensor 8 transmits pressure data to the external CNC control panel 9 through signal connection line 20 to form an electronically controlled pressure regulating closed loop. Return buffer springs 13 are installed between the four corners of the upper sliding pressing crossbeam 4 and the column base 22. After depressurization, the upper sliding pressing crossbeam 4 is pulled upward to reset.The aluminum profile limiting block 10 and workpiece positioning magnetic block 14 on the lower pressure-bearing worktable 2 cooperate to perform non-slip and non-destructive positioning of the aluminum door panel. This device integrates three core structures: a pressure-stabilizing and compensating oil circuit, an electronically controlled closed-loop pressure regulation system, and dual non-destructive positioning of the aluminum plate. All components are integrated under the unified support of the equipment base frame 1. It simultaneously solves the defects of traditional equipment, such as oil pressure attenuation, aluminum plate slippage and scratches, and poor accuracy of manual pressure regulation. The overall pipeline layout is centralized, and the component geometry is simple, reducing the difficulty of Rhino modeling, sheet metal processing, and equipment maintenance.

[0022] The guide columns 3 are four cylindrical components of equal diameter. The guide columns 3 are arranged in a rectangular array on the top surface of the equipment base frame 1, relying on the column base 22. The column base 22 and the bottom of the guide columns 3 are integrally welded together. Specifically, the bottom of the four guide columns 3 of equal diameter is integrally welded to the column base 22. The rectangular array of column base 22 is fixed at the four corners of the top surface of the equipment base frame 1. The four guide columns 3 form four parallel vertical guide tracks, which constrain the upper sliding pressing crossbeam 4 to move only in the vertical direction.

[0023] The upper sliding pressing beam 4 has through-holes at its four corners, and the through-holes are respectively fitted onto the outside of the four guide columns 3. Specifically, the through-holes at the four corners of the upper sliding pressing beam 4 completely wrap around the outer wall of the guide column 3, and the guide column 3 forms a two-way limit on the through-holes in the front and back and left and right directions, retaining only the vertical sliding freedom.

[0024] The pressure-stabilizing parallel branch pipe 17 is arranged horizontally. Both ends of the pressure-stabilizing parallel branch pipe 17 are respectively connected to the oil port on the side wall of the main hydraulic cylinder 5 and the sealing flange at the left end of the pressure-stabilizing energy storage chamber 6. The pressure-stabilizing energy storage chamber 6 and the main hydraulic cylinder 5 are connected in parallel through the pressure-stabilizing parallel branch pipe 17. Specifically: the horizontally arranged pressure-stabilizing parallel branch pipe 17 seals and connects the main hydraulic cylinder 5 and the pressure-stabilizing energy storage chamber 6; during the pressurization stage, the high-pressure oil of the main hydraulic cylinder 5 is synchronously stored in the pressure-stabilizing energy storage chamber 6; during the pressure holding stage, when the oil pressure of the main hydraulic cylinder 5 decreases, the oil stored in the pressure-stabilizing energy storage chamber 6 flows back into the main hydraulic cylinder 5 through the pressure-stabilizing parallel branch pipe 17 to compensate for the pressure.

[0025] The pressure measuring branch pipe 19 is arranged vertically, and its upper and lower ends are respectively sealed and connected to the bottom three-way port of the electromagnetic proportional pressure regulating valve 7 and the top interface of the pressure sensor 8. Specifically, the vertically arranged pressure measuring branch pipe 19 has no extra bends and directly connects the internal oil circuit of the electromagnetic proportional pressure regulating valve 7 to the sensing end of the pressure sensor 8. The oil pressure in the oil circuit is transmitted to the sensing element of the pressure sensor 8 without loss.

[0026] The aluminum profile limiting block 10 has an L-shaped block structure. The aluminum profile limiting block 10 can be detachably snapped onto the four edges of the lower pressure-bearing worktable 2. The workpiece positioning magnetic block 14 is embedded and fixed inside the surface of the lower pressure-bearing worktable 2, and the top surface of the workpiece positioning magnetic block 14 is flush with the top surface of the lower pressure-bearing worktable 2. Specifically, the L-shaped aluminum profile limiting block 10 can be detachably installed on the four sides of the lower pressure-bearing worktable 2 to mechanically limit the movement from the outside of the door panel. The top surface of the embedded workpiece positioning magnetic block 14 is flush with the lower pressure-bearing worktable 2 and is fixed by magnetic attraction from the bottom surface of the aluminum door panel without any protrusions damaging the material.

[0027] The number of return buffer springs 13 corresponds one-to-one with the number of guide columns 3. The upper hook of the return buffer spring 13 is connected to the four corners of the bottom of the upper sliding pressing beam 4, and the lower hook of the return buffer spring 13 is connected to the fixed point on the outside of the column base 22. Specifically, when the upper sliding pressing beam 4 is pressed down, the return buffer spring 13 is compressed and stores elastic potential energy. After the oil circuit is depressurized, the return buffer spring 13 releases the tension and simultaneously pulls the four corners of the upper sliding pressing beam 4 to lift and reset along the guide column 3.

[0028] A composite pressing method based on a pressure-stabilized hydraulic cold pressing device for composite pressing of all-aluminum door panels includes the following complete operation steps: S1. Workpiece layering and positioning: The seamless welded aluminum profile frame, UV-printed aluminum decorative panel, and aluminum honeycomb core material are stacked sequentially on the top surface of the lower pressure worktable 2. The aluminum profile limiting blocks 10 around the lower pressure worktable 2 are moved to fit the four sides of the aluminum door panel to complete the horizontal and vertical limiting. The workpiece positioning magnetic block 14 on the surface of the lower pressure worktable 2 is activated, and the bottom surface of the aluminum decorative panel is attracted by magnetic attraction to limit the horizontal sliding of the aluminum sheet and complete the clamp-free and non-destructive positioning. S2. Input and storage of working parameters: The operator operates the CNC control panel 9 on the right front outer side of the equipment and inputs three sets of process parameters, namely, target stabilizing pressure, pressure holding time, and pressure release buffer time, according to the thickness of the aluminum door panel to be processed, the density of aluminum honeycomb filling, and the type of adhesive. The CNC control panel 9 simultaneously opens the pressure signal receiving channel and waits for the pressure sensor 8 to transmit real-time oil circuit pressure data. S3, Oil supply downward pressurization: Start the equipment oil supply program. The hydraulic oil inside the hydraulic oil supply tank 12 is transported upward to the main hydraulic cylinder 5 through the high-pressure oil supply main pipe 16. The piston rod of the main hydraulic cylinder 5 extends downward, driving the upper sliding pressing beam 4 to slide vertically downward along the four guide columns 3. The flexible buffer silicone pad 11 on the bottom surface of the upper sliding pressing beam 4 slowly adheres to the upper surface of the all-aluminum door panel, applying initial pressure to the multi-layer aluminum composite panel. The high-pressure oil inside the main hydraulic cylinder 5 is simultaneously transported to the pressure-stabilizing energy storage chamber 6 through the pressure-stabilizing parallel branch pipe 17 to complete the oil storage. S4. Closed-loop pressure stabilization and continuous pressure holding: The oil pressure is transmitted to the electromagnetic proportional pressure regulating valve 7 through the pressure regulating connection short pipe 18. The pressure measuring branch pipe 19 at the bottom of the electromagnetic proportional pressure regulating valve 7 transmits the oil pressure to the pressure sensor 8. The pressure sensor 8 collects the oil pressure value in real time and transmits it to the CNC control panel 9 through the signal connection line 20. The CNC control panel 9 compares the real-time oil pressure with the preset pressure stabilization threshold and automatically adjusts the opening of the electromagnetic proportional pressure regulating valve 7. When the oil pressure decreases, the pressure stabilization and energy storage oil chamber 6 releases the stored oil to compensate for the oil pressure, maintaining a constant pressure throughout the process and continuously holding the pressure for the preset duration, so that the adhesive layers of the aluminum door panel are evenly filled and bonded. S5, graded pressure relief beam lifting: After the pressure holding process is completed, the CNC control panel 9 sends a pressure relief command to the electromagnetic proportional pressure regulating valve 7 for initial pressure relief. The operator rotates the pressure relief manual valve 15 at the front end of the hydraulic oil supply tank 12 to complete the complete pressure relief of the system. After the oil pressure drops, the four return buffer springs 13 pull the upper sliding pressing beam 4 along the guide column 3 to slide upward and reset by their own elastic tension. The flexible buffer silicone pad 11 is removed from the surface of the aluminum door panel. S6. Finished Product Unloading and Workpiece Replacement: Deactivate the magnetic attraction function of the workpiece positioning magnetic block 14, release the adsorption constraint on the bottom surface of the aluminum sheet, remove the composite aluminum door panel horizontally along the lower pressure workbench 2, clean the residual adhesive on the workbench surface, and reinstall the next set of aluminum door panels to be pressed. Repeat steps S1 to S5 for continuous production. Specifically: S1 relies on the lower pressure workbench 2, aluminum profile limit block 10, and workpiece positioning magnetic block 14 to complete the non-destructive positioning of the aluminum door panel; S2 inputs the corresponding door panel process parameters through the CNC control panel 9, and reserves a signal receiving channel for the pressure sensor 8; S3 hydraulic supply... Oil tank 12 supplies oil to the main hydraulic cylinder 5 via high-pressure oil supply main pipe 16. The upper sliding pressing beam 4 is pressed down along the guide column 3, while the pressure stabilizing parallel branch pipe 17 stores oil into the pressure stabilizing energy storage chamber 6. In S4, the oil pressure is transmitted to the pressure sensor 8 via pressure regulating connecting short pipe 18 and pressure measuring branch pipe 19. The signal connection line 20 transmits the data back to the CNC control panel 9, which in turn adjusts the electromagnetic proportional pressure regulating valve 7, dynamically replenishing the pressure stabilizing energy storage chamber 6. In S5, the electromagnetic proportional pressure regulating valve 7 initially releases pressure, and the pressure release manual valve 15 completely releases pressure. The return buffer spring 13 pulls the upper sliding pressing beam 4 to reset. In S6, the magnetic suction block 14 releases the workpiece positioning force for unloading and cyclic production. The entire set of steps and all the labeled structures of the device are linked together to form a dedicated pressure stabilizing pressing process. A standardized closed-loop pressure-stabilized production process adapted to multi-layer composite aluminum door panels has been established, eliminating the need for repeated manual pressure adjustments throughout the process and preventing panel scrapping through non-destructive positioning. It can be seamlessly integrated with seamless welding machines, four-sided saws, and UV printers to form a complete automated production line for aluminum door panels, significantly improving product bonding consistency and reducing the defect rate.

[0029] In the S4 closed-loop pressure stabilization and continuous pressure holding step, when the pressure sensor 8 detects that the real-time oil pressure is lower than the stabilization threshold entered in the CNC control panel 9, the CNC control panel 9 controls the electromagnetic proportional pressure regulating valve 7 to reduce the return oil opening. The hydraulic oil stored in the pressure stabilization and energy storage chamber 6 flows back into the main hydraulic cylinder 5 to compensate for the pressure. When the pressure sensor 8 detects that the real-time oil pressure is higher than the preset stabilization threshold, the CNC control panel 9 controls the electromagnetic proportional pressure regulating valve 7 to increase the return oil opening. The excess hydraulic oil flows back to the hydraulic oil supply tank 12. The entire process is dynamically closed-loop pressure regulation; specifically: pressure sensor 8 collects oil circuit pressure in real time through pressure measuring branch pipe 19, and the pressure data is transmitted to CNC control panel 9 through signal connection line 20; CNC control panel 9 compares the real-time oil pressure with the preset threshold and controls the opening of electromagnetic proportional pressure regulating valve 7 in both directions: when the pressure is too low, the return oil is closed and the pressure stabilizing and energy storage oil chamber 6 replenishes oil to the main hydraulic cylinder 5 through pressure stabilizing parallel branch pipe 17; when the pressure is too high, the return oil is opened, and excess oil flows back to hydraulic oil supply tank 12, dynamically balancing the oil circuit pressure.

[0030] In this invention, the equipment base frame 1 serves as the supporting base, the lower pressure workbench 2 holds an all-aluminum door panel, four guide columns 3 are rectangularly fixed to the four corners of the frame by column base 22, the upper sliding pressing crossbeam 4 slides on the outside of the guide columns 3 at the four corners, and can only slide vertically, the flexible buffer silicone pad 11 on the bottom surface of the crossbeam evenly distributes the pressing force, and the main hydraulic cylinder 5 on the top surface provides the downward pressing power. The hydraulic oil supply tank 12 supplies oil to the main hydraulic cylinder 5 via the high-pressure oil supply main pipe 16. The cylinder sidewall is connected to the pressure-stabilizing energy storage chamber 6 via the pressure-stabilizing parallel branch pipe 17. Oil is stored synchronously during pressurization and the pressure is compensated for during the pressure holding stage. The energy storage chamber 6 is connected to the electromagnetic proportional pressure regulating valve 7 via the pressure regulating connecting short pipe 18. The vertical pressure measuring branch pipe 19 at the bottom of the pressure regulating valve is connected to the pressure sensor 8. The sensor transmits the real-time oil pressure to the CNC control panel 9 via the signal connection line 20, forming an electronically controlled closed-loop pressure regulating system. The lower pressure-bearing worktable 2 is equipped with aluminum profile limit blocks 10 and workpiece positioning magnetic blocks 14 to achieve non-destructive positioning of the aluminum plate. The return buffer spring 13 connects the crossbeam and the column base 22. After pressure relief, the crossbeam is automatically raised. The pressure relief manual valve 15 realizes emergency pressure relief of the whole machine.

[0031] The matching pressing method relies on the above structure to operate in steps: First, the door panel is positioned without slippage by the aluminum profile limiting block 10 and the workpiece positioning magnetic block 14; then, the door panel process parameters are entered by the CNC control panel 9; subsequently, the hydraulic oil supply tank 12 supplies oil to drive the main hydraulic cylinder 5 to press down, and simultaneously stores oil in the pressure stabilizing and energy storage chamber 6; during the pressure holding stage, the pressure sensor 8 continuously collects the oil pressure, and the CNC control panel 9 links with the electromagnetic proportional pressure regulating valve 7 to dynamically adjust the oil circuit, and the pressure stabilizing and energy storage chamber 6 replenishes and stabilizes the pressure in real time; after the pressure holding is completed, the pressure is released in stages, the return buffer spring 13 drives the crossbeam to reset, and after the magnetic constraint is released, the material is unloaded and the production cycle continues.

[0032] This system enables the pressure-stabilizing and energy-storing oil storage chamber 6 to compensate for oil pressure loss, solving problems such as aluminum plate dents, honeycomb collapse, and door panel delamination; magnetic attraction and stop block dual positioning prevent UV-damaged aluminum panels; electronic closed-loop pressure regulation replaces manual repeated valve adjustments, significantly improving production consistency; the overall structure is simple with centralized piping, making Rhino modeling and processing less difficult; the exclusive segmented pressure stabilizing process is compatible with multi-layer aluminum composite panels and can be connected to the entire aluminum door panel processing production line, significantly reducing the defect rate and labor costs.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels, comprising a base frame (1), characterized in that: The equipment base frame (1) has a lower pressure-bearing worktable (2) centrally located inside. The lower pressure-bearing worktable (2) has four sets of guide columns (3) on its outer perimeter. The bottom of the guide columns (3) is fixed with column bases (22). The column bases (22) are fixed to the four corners of the top surface of the equipment base frame (1). The guide columns (3) are slidably connected to the upper sliding pressing beams (4). The bottom surface of the upper sliding pressing beams (4) is attached to flexible buffer silicone pads (11). The upper sliding pressing beam (4) has a main hydraulic cylinder (5) fixed at the center of its top surface. The bottom of the main hydraulic cylinder (5) is connected to a high-pressure oil supply main pipe (16). The bottom end of the high-pressure oil supply main pipe (16) is connected to a hydraulic oil supply tank (12). The hydraulic oil supply tank (12) is located on the left rear side inside the equipment base frame (1). A pressure relief manual valve (15) is installed on the outer wall of the front end of the hydraulic oil supply tank (12). The side wall of the main hydraulic cylinder (5) is connected to a pressure stabilizing parallel branch pipe (…). 17), the end of the pressure-stabilizing parallel branch pipe (17) is connected to the pressure-stabilizing energy storage oil chamber (6), the end of the pressure-stabilizing energy storage oil chamber (6) is connected to the electromagnetic proportional pressure regulating valve (7) through the pressure regulating connecting short pipe (18), the bottom of the electromagnetic proportional pressure regulating valve (7) is connected to the pressure measuring branch pipe (19), the lower end of the pressure measuring branch pipe (19) is equipped with a pressure sensor (8), the pressure sensor (8) leads out a signal connection line (20), the end of the signal connection line (20) is connected to the CNC controller The control panel (9) is fixed to the right front outer side of the equipment base frame (1). The guide column (3) is fitted with a column protective shell (21). The upper sliding pressing beam (4) is installed between the four corners and the four corners of the equipment base frame (1). The upper pressure worktable (2) is equipped with aluminum profile limiting blocks (10) on the top edge. The lower pressure worktable (2) is evenly distributed with workpiece positioning magnetic blocks (14).

2. The pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 1, characterized in that: The guide column (3) consists of four cylindrical components of equal diameter. The guide column (3) is arranged in a rectangular array on the top surface of the equipment base frame (1) based on the column base (22). The column base (22) and the bottom of the guide column (3) are integrally welded together.

3. The pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 1, characterized in that: The upper sliding pressing beam (4) has through-holes at its four corners, and the through-holes are respectively fitted onto the outside of the four guide columns (3).

4. The pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 1, characterized in that: The pressure-stabilizing parallel branch pipe (17) is arranged in the horizontal direction. The two ends of the pressure-stabilizing parallel branch pipe (17) are respectively connected to the oil port on the side wall of the main hydraulic cylinder (5) and the sealing flange at the left end of the pressure-stabilizing energy storage chamber (6). The pressure-stabilizing energy storage chamber (6) and the main hydraulic cylinder (5) are connected in parallel through the pressure-stabilizing parallel branch pipe (17).

5. The pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 1, characterized in that: The pressure measuring branch pipe (19) is arranged vertically, and the upper and lower ends of the pressure measuring branch pipe (19) are respectively sealed and connected to the bottom three-way port of the electromagnetic proportional pressure regulating valve (7) and the top interface of the pressure sensor (8).

6. The pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 1, characterized in that: The aluminum profile limiting block (10) is an L-shaped block structure. The aluminum profile limiting block (10) is detachably clamped to the four edges of the lower pressure worktable (2). The workpiece positioning magnetic block (14) is embedded and fixed inside the surface of the lower pressure worktable (2). The top surface of the workpiece positioning magnetic block (14) is flush with the top surface of the lower pressure worktable (2).

7. The pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 1, characterized in that: The number of return buffer springs (13) corresponds one-to-one with the number of guide columns (3). The upper hook of the return buffer spring (13) is connected to the four corners of the bottom of the sliding pressing beam (4), and the lower hook of the return buffer spring (13) is connected to the fixed point on the outside of the column base (22).

8. A composite pressing method based on the pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Workpiece layering and positioning: The seamless welded aluminum profile frame, UV printed aluminum decorative panel, and aluminum honeycomb core material are stacked sequentially on the top surface of the lower pressure worktable (2). The aluminum profile limiting blocks (10) around the lower pressure worktable (2) are moved to fit the four sides of the aluminum door panel to complete the horizontal and vertical limiting. The workpiece positioning magnetic block (14) on the surface of the lower pressure worktable (2) is activated. The bottom surface of the aluminum decorative panel is attracted by magnetic attraction, which restricts the horizontal sliding of the aluminum plate and completes the non-clamping and non-destructive positioning. S2. Input and storage of working parameters: The operator operates the CNC control panel (9) on the right front outer side of the equipment and inputs three sets of process parameters, namely, target stabilizing pressure, pressure holding time and pressure release buffer time, according to the thickness of the aluminum door panel to be processed, the density of aluminum honeycomb filling and the type of glue. The CNC control panel (9) simultaneously opens the pressure signal receiving channel and waits for the pressure sensor (8) to transmit real-time oil circuit pressure data. S3, Oil supply downward pressurization: Start the equipment oil supply program, the hydraulic oil inside the hydraulic oil supply tank (12) is transported upward to the main hydraulic cylinder (5) through the high pressure oil supply main pipe (16), the piston rod of the main hydraulic cylinder (5) extends downward, driving the upper sliding pressing beam (4) to slide vertically downward along the four guide columns (3), the flexible buffer silicone pad (11) on the bottom surface of the upper sliding pressing beam (4) slowly adheres to the upper surface of the all-aluminum door panel, applying initial pressure to the multi-layer aluminum composite plate, and the high pressure oil inside the main hydraulic cylinder (5) is simultaneously transported to the pressure stabilizing energy storage chamber (6) through the pressure stabilizing parallel branch pipe (17) to complete the oil storage; S4. Closed-loop pressure regulation and continuous pressure holding: The oil pressure is transmitted to the electromagnetic proportional pressure regulating valve (7) through the pressure regulating connection short pipe (18). The pressure measuring branch pipe (19) at the bottom of the electromagnetic proportional pressure regulating valve (7) transmits the oil pressure to the pressure sensor (8). The pressure sensor (8) collects the oil pressure value in real time and transmits it to the CNC control panel (9) through the signal connection line (20). The CNC control panel (9) compares the real-time oil pressure with the preset pressure regulation threshold and automatically adjusts the opening of the electromagnetic proportional pressure regulating valve (7). When the oil pressure decreases, the pressure stabilizing energy storage oil chamber (6) releases the stored oil to compensate for the oil pressure. The constant pressure is maintained throughout the process, and the pressure is continuously maintained for the preset time, so that the adhesive layers of the aluminum door panel are evenly filled and bonded. S5, graded pressure relief beam lifting: After the pressure holding process is completed, the CNC control panel (9) sends a pressure relief command to the electromagnetic proportional pressure regulating valve (7) for initial pressure relief. The operator rotates the pressure relief manual valve (15) at the front end of the hydraulic oil supply tank (12) to complete the complete pressure relief of the system. After the oil pressure in the oil circuit drops, the four return buffer springs (13) pull the upper sliding pressing beam (4) along the guide column (3) to slide and reset, and the flexible buffer silicone pad (11) is removed from the surface of the aluminum door panel. S6. Finished product unloading and workpiece replacement: Turn off the magnetic attraction function of the workpiece positioning magnetic block (14), release the adsorption constraint of the bottom surface of the aluminum plate, take out the composite aluminum door panel in the horizontal direction along the lower pressure workbench (2), clean the residual glue on the workbench surface, re-lay the next set of aluminum door panels to be pressed, and repeat the S1 to S5 process for continuous production.

9. The composite pressing method of the pressure-stabilizing hydraulic cold pressing device for composite pressing of all-aluminum door panels according to claim 8, characterized in that: In the S4 closed-loop pressure stabilization and continuous pressure holding step, when the pressure sensor (8) detects that the real-time pressure of the oil circuit is lower than the stabilization threshold entered by the CNC control panel (9), the CNC control panel (9) controls the electromagnetic proportional pressure regulating valve (7) to reduce the return oil opening, and the hydraulic oil stored in the pressure stabilization and energy storage oil chamber (6) flows back into the main hydraulic cylinder (5) to compensate for the pressure. When the pressure sensor (8) detects that the real-time pressure of the oil circuit is higher than the preset stabilization threshold, the CNC control panel (9) controls the electromagnetic proportional pressure regulating valve (7) to increase the return oil opening, and the excess hydraulic oil flows back to the hydraulic oil supply tank (12) to perform full-process dynamic closed-loop pressure stabilization and regulation.

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