Multi-point panel flexible forming tool

Abstract

The application discloses a kind of multi-point panel flexible forming tool, belong to stamping forming equipment technical field, this multi-point panel flexible forming tool, including lower die group and upper die group, the lower die group and upper die group are provided with upper and lower corresponding contact unit along height direction, the contact unit is arranged in rectangular matrix.This application is optimized by overall structure, matrix distribution contact unit, each unit is integrated by dynamic sleeve, fixed sleeve The hydraulic telescopic assembly consisting of, and the rotating assembly consisting of shell, rotating rod and active locking piece, only need to place a reference element between upper and lower die set, the top disc of each contact unit can be automatically rotated by its inclined end surface, and is self-adapting telescopic by telescopic component, to accurately fit any complex three-dimensional surface in a few minutes, greatly shorten the new product development cycle, and significantly reduce the cost of small batch, multi-species production tooling.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of punch forming equipment, and particularly relates to a multi-point panel flexible forming tool. BACKGROUND

[0002] In modern manufacturing industry, especially in the fields of aerospace, high-speed trains, automobile manufacturing and high-end building decoration, the application of metal or composite material panels (such as aircraft skin, vehicle body covering, instrument panel, etc.) with complex three-dimensional curved surfaces is increasingly widespread. The forming process of such panels, especially the production mode of small batch and multiple varieties, puts forward very high requirements on die technology.

[0003] At present, the mainstream panel forming process mainly relies on traditional integral rigid molds. Such molds are usually processed from a whole piece of metal material by casting, forging or numerical control milling, and the profile is completely consistent with the shape of the target product, which requires that for each new product with different shapes, a new rigid mold must be designed and manufactured. The processing of the mold is complex, involving a large number of high-precision machining, which not only takes time (usually several weeks or even months), but also costs a lot, often tens of thousands of yuan or even hundreds of thousands of yuan. In the product development trial stage, the design drawings change frequently, and each modification means that the original mold is scrapped or repaired, resulting in a sharp increase in trial cost and a serious delay in the development cycle of new products.

[0004] Therefore, a multi-point panel flexible forming tool is provided. SUMMARY

[0005] The technical problem to be solved by the application is to overcome the shortcomings of the prior art and provide a multi-point panel flexible forming tool.

[0006] The technical scheme adopted to solve the above technical problem is:

[0007] A multi-point panel flexible forming tool, comprising:

[0008] A lower die set and an upper die set, the lower die set and the upper die set are provided with corresponding contact units in the height direction, and the contact units are arranged in a rectangular array;

[0009] A lifting frame, the lifting frame is fixedly connected with the lower die set and the upper die set and drives the upper die set to move close to and away from the lower die set in the height direction;

[0010] The contact unit comprises a telescopic assembly, a rotating assembly and a pressing assembly. The telescopic assembly comprises a movable sleeve and a fixed sleeve coaxially sleeved, and the movable sleeve slides along the fixed sleeve in the axial direction by hydraulic drive. The rotating assembly comprises a housing and a rotating rod, the housing is fixedly connected with the movable sleeve through a locking pin, and the rotating rod is rotationally connected with the housing through a driving locking member. The driving locking member controls the mutual fixation of the rotating rod and the housing by hydraulic drive. The pressing assembly is provided with a pressing disc, which is fixed at one end of the rotating rod outside the housing. The pressing disc is provided with an end face inclined at 45 degrees.

[0011] The lifting frame first lifts the upper die set, the telescopic assembly extends the rotating assembly to the limit length, and the reference member is placed between the pressing assemblies. When the lifting frame drives the upper die set to approach the lower die set, the pressing disc contacts the reference member, the rotating rod rotates due to the contact between the end face of the pressing disc and the reference member, the telescopic assembly continuously depressurizes and slowly shrinks to adapt to the ups and downs and inclination angle of the reference member. After the pressing disc is attached to the reference member, the telescopic assembly stops shrinking, the rotating assembly locks and stops rotating the pressing assembly, and a stamping surface can be formed. Then the lifting frame drives the upper die set to move upward away from the lower die set, the reference member is removed, and the to-be-stamped part is placed on the lower die set. At this time, the lifting frame drives the upper die set to move downward to approach the lower die set, and the pressing disc can extrude the to-be-stamped part to complete the stamping and molding action.

[0012] Further, the lower die set and the upper die set are provided with a frame, the frame is assembled and connected with the lifting frame through a structural member, and the contact unit is fixedly surrounded by the frame.

[0013] Through the above technical solution, the frame adopts an angle steel welded to form a cage structure, which is arranged around the contact unit, has high overall strength and stable structure under stress, is shielded by a decorative cover plate, forms a complete and flat outer surface, and prevents the contact unit inside from being damaged due to collision with external structures.

[0014] Further, the contact unit further comprises a guide frame, the guide frame is fixedly connected with the frame, and the movable sleeve is slidingly connected with the guide frame.

[0015] Through the above technical solution, the guide frame can vertically guide the middle section of the movable sleeve. A linear bearing is arranged at the connection position to ensure that the movable sleeve slides in the axial direction and is stable in the radial direction when subjected to radial force. Meanwhile, the frame surrounds the contact unit on all sides to fix the position of the guide frame and provide stable support for the guide frame.

[0016] Further, the telescopic assembly further comprises a bottom plate, the fixed sleeve is fixedly connected with the frame through the bottom plate, an oil passing cavity is arranged in the fixed sleeve, an oil passing port is arranged on the bottom plate corresponding to the oil passing cavity, and the oil passing port is connected with an external hydraulic drive device.

[0017] Through the technical scheme, the bottom plate and the frame are fixed by bolts or welding, so that the fixing strength of the fixed sleeve is improved, the fixed sleeve is stably vertical, and the external hydraulic driving device delivers or extracts hydraulic oil to the oil passing cavity through the oil passing port, so that the volume of the oil passing cavity between the movable sleeve and the fixed sleeve changes, the movable sleeve extends away from the fixed sleeve when the hydraulic oil enters, the oil passing cavity synchronously increases, the movable sleeve retracts towards the fixed sleeve when the hydraulic oil is extracted, and the oil passing cavity synchronously decreases, so that the axial extension and retraction driving of the movable sleeve can be realized.

[0018] Further, the housing is provided with a joint cavity, an end sleeve is arranged at the port position of the joint cavity, the rotating rod is arranged in the middle part of the end head, a sealing ring is arranged at the port of the joint cavity, and a supporting rod is arranged at one end of the joint cavity.

[0019] Through the technical scheme, the joint cavity is used for accommodating the driving locking part, the end sleeve cooperates with the sealing ring in the middle part of the rotating rod, so that the joint cavity is stably sealed, meanwhile, the end sleeve limits the rotation of the rotating rod, so that the radial position of the rotating rod is more stable, the end sleeve is connected with the housing through bolts, so that the housing is convenient to disassemble and assemble, and the end sleeve is convenient to replace after wear, the supporting rod and the rotating rod are fixed to each other, the rotating rod cannot rotate freely when the supporting rod is fixed to the inner wall of the joint cavity through the driving locking part, and the rotating rod can rotate freely when the supporting rod is separated from the inner wall of the joint cavity through the driving locking part.

[0020] Further, the driving locking part comprises a friction ring one and a friction ring two arranged in layers, an inner supporting lug is arranged on the inner side of the friction ring one, an outer supporting lug is arranged on the outer side of the friction ring two, a straight embedding groove matched with the inner supporting lug is arranged on the circumferential outer wall of the supporting rod, and an engaging embedding groove matched with the outer supporting lug is arranged on the inner wall of the joint cavity.

[0021] Through the technical scheme, a specific structure of the driving locking part is provided, the top and bottom surfaces of the friction ring one are provided with friction plates, the friction ring two is a wear-resistant plate made of metal, the inner supporting lug is slidably arranged in the straight embedding groove of the supporting rod, and the outer supporting lug is slidably arranged in the engaging embedding groove arranged on the inner wall of the joint cavity, so that the friction ring one and the friction ring two can slide along the supporting rod in the axial direction, meanwhile, the friction ring one and the supporting rod can rotate synchronously, and the friction ring two cannot rotate relative to the housing, so that the supporting rod cannot rotate relative to the housing when the friction ring one and the friction ring two are pressed tightly, and the locking of the rotating rod can be completed.

[0022] Further, the driving locking part further comprises a piston, a piston cavity is arranged at the end, away from the end sleeve, of the housing, the piston is slidably arranged in the piston cavity, and a containing groove is arranged at the position corresponding to the supporting rod.

[0023] By the above technical scheme, in order to realize the driving of the mutual approaching and moving away of the friction ring one and the friction ring two, a piston cavity coaxial with the supporting rod is arranged, and a piston ring sliding along the supporting rod is arranged, so that when hydraulic oil is input into the piston cavity far from the supporting rod, the friction ring one and the friction ring two can be squeezed to approach each other by the piston, and when the hydraulic oil in the piston cavity is discharged, the friction ring one and the friction ring two are released by the piston moving away from the friction ring one and the friction ring two. The design of the accommodating groove ensures that the end of the supporting rod is always inserted into the piston, so that the piston slides straightly, and when the rotating rod and the supporting rod are subjected to a radial force, the piston can squeeze the circumferential side wall of the supporting rod, and the end cooperates with the radial limiting of the middle section of the rotating shaft, so as to further stabilize the position of the rotating rod and the supporting rod, thereby ensuring the vertical stability of the rotating rod when subjected to a radial force.

[0024] Further, a threaded hole is arranged at the position corresponding to the piston cavity of the shell, a connector is rotatably arranged in the threaded hole, the end of the connector is provided with a connecting pipe one, an inner lining pipe is slidably inserted into the end of the connecting pipe one away from the connector, an outer connecting pipe two is arranged on the outer side of the inner lining pipe, a connecting port is arranged at the end of the connecting pipe two away from the connecting pipe one, and the connecting pipe two is connected with an external hydraulic control device through the connecting port.

[0025] By the above technical scheme, in order to realize the control of the up and down movement of the piston, the piston cavity far from the friction ring one and the friction ring two is connected with the hydraulic control device outside, so that when the hydraulic oil in the piston cavity is discharged, the piston is released and moves downward under the action of gravity, the friction ring one and the friction ring two are released, the friction ring one and the friction ring two can rotate relatively, and the end face direction of the rotating rod can be adjusted at this time to adapt to the bending direction of different parts. When locking is required, the external hydraulic control device fills the hydraulic oil, the piston is pushed to move upward, the friction ring one and the friction ring two are squeezed to approach each other, the friction ring one and the friction ring two are rubbed to lock the position of the rotating rod, and the subsequent continuous punching processing can be carried out. It needs to be emphasized that in order to ensure that the shell can be telescoped along the height direction to adapt to the ups and downs of the parts, the connection between the piston cavity and the hydraulic control device outside is designed as a telescopic structure, the inner lining pipe is slidably connected between the connecting pipe one and the connecting pipe two, the length change can be ensured while the sealing is ensured, the displacement of the shell along the height direction is ensured, and the hard sliding sealing pipe group has stronger breaking resistance than the coiled hose, prolongs the maintenance period, and the high-strength sealing ring or passive compensation sealing flange ring is used for sealing the joint position, so that maintenance is not required.

[0026] Further, a side hole is arranged at the position corresponding to the joint cavity of the shell, a plug is detachably arranged in the side hole, and heat dissipation oil is filled in the joint cavity.

[0027] Through the technical scheme, the side hole is connected with the plug through threads, so that the plug can be opened to check the structure state of the internal driving locking part, damage of the driving locking part is found in time, and the joint cavity is filled through the heat dissipation oil, so that dry grinding of the friction ring I and the friction ring II is avoided, surface wear of the friction ring I and the friction ring II is reduced, and the maintenance period is prolonged.

[0028] Further, the top disc is connected with the rotating rod through a ball hinge, and the top disc is provided with an arc-shaped outer edge around the end face.

[0029] Through the technical scheme, the end of the top disc is provided with a ball socket, and the ball head at the end of the rotating rod is matched, so that the ball hinge connection is formed. This connection mode enables the end face to change the inclination angle, adapts to the part plane and the inclined surface with different inclination angles, the arc-shaped outer edge prevents scratching the part surface, and the hydraulic locking structure needs to be matched to ensure that the position is stable during initial adjustment, so that subsequent stamping work can be carried out.

[0030] The beneficial effects of the present application are as follows:

[0031] (1) Through the optimization of the overall structure, the matrix type distributed contact units are integrated with the hydraulic telescopic assembly composed of the movable sleeve and the fixed sleeve, and the rotating assembly composed of the shell, the rotating rod and the driving locking part. Only one reference part needs to be placed between the upper and lower mold sets, and the top disc of each contact unit can automatically rotate through the inclined end face, and the telescopic assembly is self-adaptive, so that any complex three-dimensional curved surface can be accurately fitted within a few minutes, the new product development cycle is greatly shortened, and the tooling cost of small batch and multi-variety production is significantly reduced.

[0032] (2) Through the three-degree-of-freedom self-adaptive design of each contact unit, the top disc is connected with the rotating rod through a ball hinge, and is matched with the inclined end face to ensure face contact with the workpiece instead of point contact, effectively avoiding stress concentration. The driving locking part is pressed against the friction ring I and the friction ring II through the hydraulic drive piston, can provide strong locking torque after fitting, ensures the stable posture during stamping, and the structural stability is provided by the cage type frame welded with angle steel. At the same time, the cooperation of the guide frame and the linear bearing provides accurate radial support for the axial sliding of the movable sleeve, prevents the deflection under the huge stamping force, and ensures the stability of long-term operation and the consistency of products.

[0033] (3) The action of each contact unit of the present application is precisely controlled by a hydraulic system, and control instructions are automatically generated by reading three-dimensional model data, realizing full-automatic fitting and stamping, and greatly reducing the dependence on manual experience. In terms of service life and maintenance, the heat dissipation oil filled in the joint cavity effectively lubricates and cools the active locking part, and the telescopic hard hydraulic pipeline formed by the connection pipe 1 and the connection pipe 2 through the lining pipe is more resistant to high pressure and wear than the traditional hose, realizing the design of nearly maintenance-free. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of the present application;

[0035] Figure 2 is a schematic diagram of the lower die assembly of the present application;

[0036] Figure 3 is a schematic diagram of the contact unit of the present application;

[0037] Figure 4 is a top view of the contact unit of the present application;

[0038] Figure 5 is a schematic diagram of the contact unit of Figure 4 along the A-A line direction;

[0039] Figure 6 is a schematic diagram of the contact unit of Figure 4 along the B-B line direction;

[0040] Figure 7 is a schematic diagram of the position between the top disc, rotating rod, shell and their connected structures of the present application;

[0041] Figure 8 is a schematic diagram of the disassembly between the top disc, rotating rod, shell and their connected structures of the present application;

[0042] Figure 9 is a schematic diagram of the position between the shell, fixed sleeve, movable sleeve and their connected structures of the present application;

[0043] Figure 10 is a schematic diagram of the disassembly between the shell, fixed sleeve, movable sleeve and their connected structures of the present application.

[0044] Reference signs: 1, lifting frame; 2, lower die set; 3, upper die set; 4, contact unit; 5, moving sleeve; 51, bottom plate; 52, fixed sleeve; 53, oil passing cavity; 54, oil passing port; 55, locking pin; 6, guide frame; 7, shell; 71, mounting groove; 72, end sleeve; 73, connecting pipe I; 731, joint; 732, inner lining pipe; 733, connecting pipe II; 734, connecting port; 74, piston cavity; 75, engaging cavity; 751, engaging slot; 752, side hole; 8, rotating rod; 81, friction ring I; 811, inner supporting lug; 82, friction ring II; 821, outer supporting lug; 83, piston; 831, accommodating groove; 84, sealing ring; 85, supporting rod; 851, straight slot; 9, top disc; 91, end face; 92, arc-shaped outer edge. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0046] Reference Figures 1 to 10 As shown in the drawings, the present embodiment provides a multi-point panel flexible forming tooling, aiming to solve the problems of high cost, long cycle and poor flexibility of traditional rigid molds when stamping complex curved surfaces, small batches and multi-variety panels. The tooling can quickly fit any complex three-dimensional curved surface through the matrix distribution of contact units with three-degree-of-freedom adaptive ability, realizing high-precision and high-efficiency flexible stamping forming.

[0047] The tooling includes a lifting frame 1 as a basic support and driving platform, and a lower die set 2 and an upper die set 3 driven by the lifting frame 1 and relatively openable and closable. Both the lower die set 2 and the upper die set 3 adopt a high-strength frame structure. Specifically, the frame preferably adopts Q235 material, an angle steel with a specification of 80mm×80mm×6mm, and is welded by full-position carbon dioxide shielded welding to form a stable cage structure. The frame not only provides a solid installation basis for internal components, but also has decorative cover plates (such as 2mm thick aluminum alloy plates) assembled by bolts around the frame, forming a flat and closed outer surface, which effectively prevents damage to precise internal components caused by external bumps during production and transportation.

[0048] Inside the frame of the lower die set 2 and the upper die set 3, contact units 4 are accurately corresponding in the height direction (i.e. the stamping direction). These contact units 4 are densely distributed in the frame in a rectangular array, for example, a 50×50 matrix, forming a flexible forming surface composed of 2500 independently controllable "punches". Each contact unit 4 is a micro electro-mechanical-hydraulic integrated system, which can independently perform extension, rotation and pressing actions.

[0049] Lift frame 1 as the power core of the whole system, through the high strength structure (such as flange and scissors type connecting rod mechanism) and the frame of the lower die set 2 and the upper die set 3 fixed connection. Its drive unit can adopt hydraulic cylinder with fixed frame, realize the accurate, stable, fast movement of the upper die set 3 in the height direction, and the repeat positioning accuracy can reach ±0.05mm.

[0050] Among them, referring to Figure 3 - Figure 6 Each contact unit 4 is the key to realize flexible forming of the tool, which is mainly composed of three parts of telescopic assembly, rotating assembly and pressing assembly.

[0051] Referring to Figure 9 and Figure 10 , the telescopic assembly is the "skeleton" of the contact unit 4, which is responsible for providing axial support force and self-adaptive displacement.

[0052] Structure: including a fixed sleeve 52 and a movable sleeve 5. The fixed sleeve 52 is fixed on the die set frame by a 45 steel bottom plate 51 with a thickness of 20mm, using M16 high-strength bolts. The movable sleeve 5 is coaxially sleeved with the fixed sleeve 52 and can axially slide outside it.

[0053] Guiding and stabilizing: in order to ensure the stability of the movable sleeve 5 when bearing radial force, a guide frame 6 is arranged. The guide frame 6 is also fixed on the frame and contacts the movable sleeve 5 through a linear bearing. Through the guidance of the guide frame 6, it ensures that the sliding is vertical without deviation.

[0054] Hydraulic drive: the inside of the fixed sleeve 52 is provided with an oil passing cavity 53 as a driving force source. The bottom plate 51 is processed with a threaded oil passing port 54, which is connected with an external hydraulic station through a high-pressure hydraulic pipe. The hydraulic station drives the movable sleeve 5 to extend or retract by injecting or extracting anti-wear hydraulic oil into the oil passing cavity 53. The maximum stroke can reach 150mm, and the output thrust can be adjusted according to the system pressure, which can reach 5kN at most.

[0055] Referring to Figure 7 and Figure 8 , the rotating assembly gives the contact unit 4 "joints", so that the pressing end can automatically adjust the posture according to the inclination angle of the workpiece surface.

[0056] Structure: including an outer shell 7 and a rotating rod 8. The outer shell 7 is rigidly connected with the top end of the movable sleeve 5 through a lock pin 55 and extends and retracts with the movable sleeve 5. The rotating rod 8 is installed through the middle part of the end sleeve 72, extends into the joint cavity 75, and is sealed with the end sleeve 72 through the cooperation of the sealing ring 84 to seal the joint cavity 75.

[0057] Active locking member: this is the key to realize rotation and locking. It is located in the joint cavity 75 inside the outer shell 7 and is composed of a piston 83, a friction ring one 81 and a friction ring two 82.

[0058] Friction ring one 81 is made of copper-based powder metallurgy material, with graphite-based solid lubricant sintered on its surface, and an inner support lug 811 is arranged on its inner edge to be slidingly connected with a straight embedding groove 851 on the end support rod 85 of the rotating rod 8, so that it can rotate synchronously with the rotating rod 8.

[0059] Meanwhile, friction ring two 82 is made of GCr15 bearing steel, which is quenched to have high hardness and good wear resistance, and an outer support lug 821 is arranged on its outer edge to be slidingly connected with an engaging embedding groove 751 on the inner wall of the engaging cavity 75, so that it remains relatively stationary with the outer shell 7.

[0060] Furthermore, the piston 83 is slidingly arranged in the piston cavity 74 at the end of the engaging cavity 75, and a containing groove 831 is arranged at the center of the piston 83 to allow the support rod 85 to be inserted and kept radially stable.

[0061] Working principle: when the posture needs to be adjusted, the hydraulic system controls the piston cavity 74 to be depressurized, the piston 83 retreats under the action of gravity, the friction ring one 81 and the friction ring two 82 are separated, and the rotating rod 8 can be freely rotated. When the top disc 9 is attached to the surface of the workpiece, the hydraulic system injects high-pressure oil (for example, 8-12 MPa) into the piston cavity 74 to push the piston 83 to compress the friction ring one 81 and the friction ring two 82. Through the transmission of the inner and outer support lugs, the support rod 85 (and the rotating rod 8) and the outer shell 7 (and the movable sleeve 5) are rigidly locked instantaneously, thereby fixing the spatial posture of the top disc 9.

[0062] The top pressing assembly is the "fingertip" directly contacting the workpiece.

[0063] Referring to Figure 7 and Figure 8 , the core is a top disc 9, which can be arranged in a fixed structure with the rotating rod 8 and has an end face 91 inclined at an angle of forty-five degrees, which can adapt to the surfaces of parts with different angles through extension and rotation. Further, the top disc 9 is connected to the end of the rotating rod 8 through a spherical hinge structure. The spherical hinge can be a steel joint bearing, which allows the top disc 9 to swing slightly in angle before being locked, so as to better attach to complex curved surfaces.

[0064] Among them, the end face 91 of the top disc 9 can generate a normal component when contacting the surface of the workpiece with a slope, guiding the rotating rod 8 to rotate and obtaining the best attachment angle through the swing of the top disc 9 (and locking the position of the top disc 9 through a separate locking mechanism). The top disc 9 is provided with an arc-shaped outer edge 92 around it and is polished or chrome-plated to prevent scratching the surface of the workpiece during stamping.

[0065] Since the contact unit 4 will move up and down during extension and retraction, the hydraulic pipeline connecting the rotating assembly thereof must be adaptive. The embodiment adopts an innovative sliding hard pipe connection structure:

[0066] Referring toFigure 9 and Figure 10 The outer shell 7 is provided with a mounting groove 71 to provide mounting space for the joint 731 and the connecting pipe one 73. The connecting pipe two 733 is externally connected with hydraulic control equipment through a connecting port 734.

[0067] The high-performance U-shaped sealing ring with PTFE coating is used between the inner liner tube 732 and the connecting pipe one 73 and the connecting pipe two 733 to ensure no leakage during sliding. Compared with traditional hoses, this structure has higher pressure resistance (up to 21 MPa), stronger wear resistance and aging resistance, and almost no maintenance is required.

[0068] To prolong the service life of the active locking member, the joint cavity 75 of the outer shell 7 is filled with industrial gear oil. A threaded side hole 752 is provided on the side of the outer shell 7, which is usually sealed with an internal hexagonal plug, to facilitate regular inspection of oil level, replenishment of lubricating oil, and maintenance of internal components. The heat dissipation oil can effectively dissipate the heat generated by friction, preventing the friction ring from overheating and failing.

[0069] The working process of the tooling is divided into two stages: "learning / modeling" and "production / punching":

[0070] Initialization: The lifting frame 1 drives the upper die set 3 to rise to the highest position. The extension assembly of all contact units 4 is fully extended, and the rotating assembly is in the unlocked state.

[0071] Place the reference part: Place a standard reference part with a target three-dimensional shape (which can be a machined finished part or a 3D printed model) on the support platform of the lower die set 2.

[0072] Adaptive fitting: The lifting frame 1 drives the upper die set 3 to slowly descend. When each top disc 9 of the upper die set 3 contacts the reference part, it will automatically rotate to adapt to the normal direction of the contact point due to the slope of the end face 91. At the same time, the corresponding extension assembly hydraulic system will continuously bleed, allowing the movable sleeve 5 to shrink until all top discs 9 perfectly fit the surface of the reference part.

[0073] Posture locking: When all top discs 9 are in place, the system synchronously injects high-pressure oil into all rotating assembly piston cavities 74, instantly locking the posture of all rotating rods 8. At this time, the surface of the upper die set 3 composed of 2500 top discs 9 accurately replicates the lower surface morphology of the reference part, forming a "flexible mold".

[0074] Remove the reference part: The lifting frame 1 drives the upper die set 3 to rise and remove the reference part.

[0075] Placing the piece to be punched: a flat piece to be punched (such as an aluminum alloy plate, a steel plate) is placed on the lower die set 2.

[0076] Punch forming: the lifting frame 1 drives the formed upper die set 3 to descend at a set speed and pressure. The array of top discs 9 of the upper die set 3 collectively extrudes the piece to be punched, so that it is plastically deformed and precisely fits the supporting surface of the lower die set 2, and finally completes the punch forming of the complex curved surface.

[0077] Reset: after the punch forming is completed, the upper die set 3 ascends, and all the contact units 4 are unlocked and extended, ready for the next work cycle.

[0078] Through the above structure and work flow, the multi-point panel flexible forming tool provided by the embodiment can realize the rapid and accurate forming of various complex curved surface panels with extremely high flexibility and efficiency, and is especially suitable for trial production and small batch production in the fields of aerospace, rail transit, automobile coverings and the like.

[0079] The above only describes the preferred embodiments of the present application and is not used to limit the protection scope of the present application.

Claims

1. A multi-point flexible panel forming tooling, characterized in that, include: The lower module (2) and the upper module (3) are provided with corresponding upper and lower contact units (4) along the height direction, and the contact units (4) are arranged in a rectangular array. Lifting frame (1), which is fixedly connected to the lower module (2) and the upper module (3) and drives the upper module (3) to move closer to or further away from the lower module (2) along the height direction; The contact unit (4) includes a telescopic assembly, a rotating assembly, and a pressing assembly. The telescopic assembly includes a movable sleeve (5) and a fixed sleeve (52) coaxially sleeved together. The movable sleeve (5) slides axially along the fixed sleeve (52) by hydraulic drive. The rotating assembly includes a housing (7) and a rotating rod (8). The housing (7) and the movable sleeve (5) are fixedly connected by a locking pin (55). The rotating rod (8) and the housing (7) are rotatably connected by an active locking member. The active locking member is hydraulically controlled to fix the rotating rod (8) and the housing (7) to each other. The pressing assembly is provided with a top plate (9). The top plate (9) is installed at the end of the rotating rod (8) located outside the housing (7). The top plate (9) is provided with an end face (91) inclined at 45 degrees. The outer shell (7) has a built-in engagement cavity (75), and an end sleeve (72) is installed at the port of the engagement cavity (75). The rotating rod (8) is disposed through the middle of the end sleeve (72). A sealing ring (84) is provided at the port of the engagement cavity (75) of the rotating rod (8). A support rod (85) is installed at one end of the rotating rod (8) inside the engagement cavity (75). The support rod (85) is engaged with the inner wall of the engagement cavity (75) through an active locking element. The active locking component includes a friction ring one (81) and a friction ring two (82) stacked together. The friction ring one (81) has an inner support ear (811) on its inner edge, and the friction ring two (82) has an outer support ear (821) on its outer edge. The outer circumference of the support rod (85) has a straight groove (851) that mates with the inner support ear (811), and the inner wall of the engagement cavity (75) has an engagement groove (751) that mates with the outer support ear (821). The active locking component also includes a piston (83). The outer shell (7) is provided with a piston cavity (74) at the end of the engagement cavity (75) away from the end sleeve (72). The piston (83) is slidably disposed in the piston cavity (74). The piston (83) is provided with a receiving groove (831) at the position corresponding to the support rod (85). The outer shell (7) has a threaded hole at the piston chamber (74), and a connector (731) is screwed into the threaded hole. A connecting pipe (73) is provided at the end of the connector (731). An inner liner (732) is slidably inserted at the end of the connecting pipe (731) away from the connector (731). A connecting pipe (733) is sleeved on the outside of the inner liner (732). A connecting port (734) is provided at the end of the connecting pipe (733) away from the connecting pipe (73). The connecting pipe (733) is connected to an external hydraulic control device through the connecting port (734).

2. The multi-point panel flexible forming tooling according to claim 1, characterized in that, The lower module (2) and the upper module (3) are provided with a frame, which is assembled and connected to the lifting frame (1) through structural components, and the contact unit (4) is fixed inside the frame.

3. The multi-point panel flexible forming tooling according to claim 2, characterized in that, The contact unit (4) also includes a guide (6), which is fixedly connected to the frame, and the moving sleeve (5) is slidably connected to the guide (6).

4. The multi-point panel flexible forming tooling according to claim 3, characterized in that, The telescopic assembly also includes a base plate (51), the fixed sleeve (52) is fixedly connected to the frame through the base plate (51), the fixed sleeve (52) has an oil passage cavity (53) inside, the base plate (51) is provided with an oil passage port (54) corresponding to the oil passage cavity (53), and the oil passage port (54) is connected to an external hydraulic drive device.

5. The multi-point panel flexible forming tooling according to claim 1, characterized in that, The top plate (9) is connected to the rotating rod (8) by a ball joint, and the top plate (9) has an arc-shaped outer edge (92) around its end face (91).

6. The multi-point panel flexible forming tooling according to claim 1, characterized in that, The outer shell (7) has a side hole (752) corresponding to the joint cavity (75), a plug is detachably installed in the side hole (752), and the joint cavity (75) is filled with heat dissipation oil.

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