Modular multi-level gradient forming apparatus and method

Abstract

The invention provides modularized multi-level gradient forming equipment and method. The modularized multi-level gradient forming equipment comprises a split type upper module, an integrated base and a hydraulic auxiliary device. The split type upper die set comprises a plurality of upper die blocks, and the upper die blocks can ascend and descend on the integrated base. The hydraulic auxiliary device comprises a hydraulic cylinder, a pressing block, a plurality of hydraulic rods and a plurality of pressing rings; the pressing block is arranged in the hydraulic cylinder, a plurality of boss structures are arranged on the pressing block, and the boss structures and the hydraulic rods are arranged in a one-to-one correspondence mode; the hydraulic rod is mounted on the hydraulic cylinder and can ascend and descend on the hydraulic cylinder, one end of the hydraulic rod is arranged to guide the boss structure, and the other end of the hydraulic rod is arranged to guide the upper die block; the pressing rings are arranged at the other ends of the hydraulic rods and correspond to the upper die blocks one to one. The heights of the lower surfaces of the boss structures decrease progressively from the middle to the two sides, and the heights of the lower surfaces of the pressing rings increase progressively from the middle to the two sides. The problem that the multi-radian variable cross-section high-strength steel part is difficult to produce by using a traditional forming process is solved.

Description

Technical Field

[0001] The present invention relates to the field of processing and forming technology, and in particular to a modular multi-level gradient forming device and method. Background Art

[0002] With the iterative upgrade of automobile lightweighting and passive safety performance requirements, the roof crossbar, as the key force transmission path of the body topological anti-collision structure, faces dual stringent standards for mechanical performance and geometric accuracy. Based on the variable-section multi-radian integrated design of high-strength steel (UHSS, tensile strength ≥1000MPa), the synergistic optimization of the material's high-strength properties and cross-sectional geometric parameters can reduce the weight of the component while improving the buckling stability under multiple load conditions. However, the high yield strength and low elongation characteristics of high-strength steel, coupled with the evolution of the shape-property coupling of complex spatial curvature, put forward requirements for the forming process that go beyond the traditional manufacturing paradigm. First, although the traditional cold stamping process can achieve high-precision forming, it is limited by the hardening index and thickness anisotropy coefficient of high-strength steel. It needs to be matched with a 10,000-ton press to overcome rebound distortion, resulting in an exponential increase in equipment investment and energy consumption costs; second, the traditional roll bending process is limited by the linear bending dynamic model and can only achieve continuous forming of single-curvature plane components, and cannot meet the spatial envelope requirements of multiple curvature centers and asymmetric sections; third, although the roll punching composite process attempts to break through the continuous deformation constraint through discrete processing, the arc structure causes uneven force on the sheet metal, resulting in the workpiece being prone to trajectory instability and large-scale deflection in the variable curvature transition zone, seriously restricting the forming consistency of complex components.

[0003] Patent document CN103418788B discloses a device and method for hot-pressing gradient materials. The device comprises upper and lower mold frames connected by struts. A lower ejector pin slides with the lower mold frame through a guide post hole and an inclined surface in the center of the lower mold frame. The upper surface of the lower ejector pin is flush with the upper surface of the lower mold frame. Multiple molds of the same structure are stacked and assembled into a gradient mold, fixed to the lower mold frame. Adjacent molds are isolated with asbestos gaskets. The lower end of the upper mold frame is coaxially mounted with the center holes of multiple molds to form a sliding fit. The lower end of the upper mold connecting rod extends between the upper and lower mold frames and is connected to the upper end of the upper mold frame. The upper end of the upper mold connecting rod extends outside the upper mold frame. However, this patent document still suffers from the drawback that it can only achieve continuous forming of planar components with a single curvature. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a modular multi-level gradient forming device and method.

[0005] According to the present invention, a modular multi-level gradient forming device is provided, comprising: a split upper die set, an integrated base, and a hydraulic auxiliary device;

[0006] The split upper die assembly includes a plurality of upper die blocks that are independent of each other, and the upper die blocks can be raised and lowered on the integrated base to extrude and form the sheet material;

[0007] The hydraulic assist device comprises:

[0008] A hydraulic cylinder, which is used to install a hydraulic rod and provide hydraulic power to the hydraulic rod;

[0009] A pressure block is arranged in the hydraulic cylinder, and a plurality of boss structures are provided on the pressure block. The boss structures are arranged in a one-to-one correspondence with the hydraulic rods, and the lower surface of the boss structure can abut against one end of the hydraulic rod to limit the position;

[0010] a plurality of hydraulic rods, each of which is mounted on the hydraulic cylinder and capable of being raised and lowered on the hydraulic cylinder, with one end of the hydraulic rod guiding the boss structure and the other end guiding the upper mold block;

[0011] A plurality of pressing rings are provided at the other end of the hydraulic rod and are arranged in one-to-one correspondence with the upper mold block, and the lower surface of the pressing ring can abut against and push the upper mold block;

[0012] Wherein, the height of the lower surfaces of the plurality of boss structures decreases from the middle to both sides, and the height of the lower surfaces of the plurality of pressure rings increases from the middle to both sides.

[0013] Preferably, the split upper module further includes:

[0014] a lifting block, the lifting block being arranged on the upper mold block;

[0015] The other end of the hydraulic rod passes through the lifting block and guides to the upper mold block, and the hydraulic rod and the lifting block can move relative to each other;

[0016] When the hydraulic rod rises, it can drive the lifting block through the pressure ring, and then drive the upper mold block to rise.

[0017] Preferably, the hydraulic cylinder comprises:

[0018] a cylinder body, wherein a hydraulic channel is provided on the cylinder body, and the hydraulic channel is used for installing the hydraulic rod;

[0019] a cylinder cover, the cylinder cover being connected to the cylinder body, the pressing block being fixed at a connection position between the cylinder cover and the cylinder body;

[0020] Wherein, the hydraulic rod is installed in the hydraulic channel and can move up and down in the hydraulic channel;

[0021] A hydraulic cavity is formed between the cylinder cover and the cylinder body, and the hydraulic cavity is communicated with the hydraulic channel.

[0022] Preferably, an injection port is provided on the boss structure, and the hydraulic cavity is connected with the hydraulic channel through the injection port.

[0023] Preferably, the hydraulic assist device further includes:

[0024] an oil seal seat, the oil seal seat being arranged on the inner side wall of the hydraulic channel, the hydraulic rod passing through the oil seal seat, and the hydraulic rod being able to move relative to the oil seal seat;

[0025] A piston is provided on the hydraulic rod and is movable in the hydraulic channel.

[0026] Preferably, the integrated base comprises:

[0027] A bottom die, the bottom die being used for extruding the sheet material together with the upper die block;

[0028] a plurality of guide posts, the guide posts being arranged on the bottom mold and used for mounting the upper mold block;

[0029] a plurality of springs, wherein the springs are sleeved on the guide pillars and located between the bottom mold and the upper mold block;

[0030] The upper mold block is mounted on the guide column, and a plurality of the upper mold blocks are arranged in sequence corresponding to the length direction of the sheet material, and can be independently raised and lowered on the guide column.

[0031] Preferably, the bottom mold is provided with a positioning pin, and the positioning pin is used to position the sheet material;

[0032] The upper mold block is provided with a positioning pin hole corresponding to the positioning pin.

[0033] Preferably, the effective mold surfaces of the split upper mold assembly and the integrated base are set according to the morphology of the target part.

[0034] The present invention also provides a modular multi-level gradient forming method, which uses the above modular multi-level gradient forming equipment;

[0035] The specific steps include:

[0036] Step S1: installing the modular multi-level gradient forming device on a press, connecting the bottom mold of the integrated base to the fixed end of the press, and connecting the cylinder head of the hydraulic auxiliary device to the execution end of the press;

[0037] Step S2: Before forming the target part, pressurizing the hydraulic cylinder to fully extend the hydraulic rod and maintaining a preset pressure so that the hydraulic rod does not retract when subjected to a reaction force from the split upper die set;

[0038] Step S3: Pressing the execution end of the press machine downward drives the hydraulic auxiliary device to press downward, so that the pressing ring located in the middle first contacts the upper mold block located in the middle, so that the middle part of the sheet metal begins to be formed. After the upper mold block located in the middle is pressed to the bottom, this step ends. At this time, the downward pressure of the multiple upper mold blocks decreases from the middle to the two sides.

[0039] Step S4: depressurizing the hydraulic auxiliary device, and then continuing to press down the press actuator, the hydraulic rod retracts until it contacts the boss structure on the pressing block. During this process, the hydraulic rods located on the two extreme sides first contact the boss structure, and the two ends of the sheet metal begin to form. As the press actuator continues to press down, the forming area of ​​the sheet metal gradually extends from the two ends to the middle. This step ends when all the upper mold blocks are pressed to the bottom.

[0040] Step S5: The press execution end is lifted, the pressing ring hooks the lifting block on the upper mold block, and drives the upper mold block to be lifted to the initial position, the target part is demoulded, and the whole forming process is completed.

[0041] Preferably, in step S3, the lower surfaces of the pressing rings connected to the hydraulic rods have different heights, the lower surface of the pressing ring located in the middle has the smallest height, and the heights of the lower surfaces of the pressing rings from the middle to the sides increase in sequence;

[0042] In step S4, the heights of the lower surfaces of the boss structures corresponding to the hydraulic rods are different. The lower surface of the boss structure located in the middle has the highest height, and the heights of the lower surfaces of the boss structures from the middle to the sides decrease in sequence.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The present invention sets the height of the lower surface of the pressing ring connected to each hydraulic rod to be different. The height of the lower surface of the pressing ring located in the middle is the smallest. The height of the lower surface of the multiple pressing rings from the middle to the sides increases in sequence. When the hydraulic auxiliary device presses down, the pressing ring located in the middle first contacts the upper mold block located in the middle, so that the middle part of the sheet begins to be formed. The degree of downward pressure of the multiple upper mold blocks from the middle to the sides decreases in sequence to complete the first stage of extrusion forming. The present invention also sets the height of the lower surface of the boss structure corresponding to each hydraulic rod to be different. The lower surface of the boss structure located in the middle is the smallest. The lower surface height of the multiple pressing rings from the middle to the sides increases in sequence. The height of the lower surface of the boss structure is the largest, and the height of the lower surfaces of the multiple boss structures decreases successively from the middle to the sides. After the first stage of extrusion forming, when the hydraulic auxiliary device releases pressure and the press execution end continues to press down, the hydraulic rod retracts until it contacts the boss structure on the pressure block. In this process, the hydraulic rods located on the two extreme sides first contact the boss structure, and the two ends of the sheet begin to form. As the press execution end continues to press down, the forming area of ​​the sheet gradually extends from the two ends to the middle, completing the second stage of extrusion forming, thereby realizing the staged progressive forming of standard parts.

[0045] 2. The present invention adopts a modular multi-level gradient forming method, deconstructs complex surfaces into discrete feature units, and adopts a staged progressive forming strategy. While reducing the forming capacity of a single process, it provides a theoretical breakthrough and technical implementation path for the industrial manufacturing of high-precision complex roof beams through dynamic path planning.

[0046] 3. The present invention solves the problem that multi-radian variable-section high-strength steel parts are difficult to produce using traditional forming processes.

[0047] 4. The process of the present invention is flexible and suitable for forming parts of various complex shapes.

[0048] 5. The present invention has a simple structure, controllable cost, and has no special requirements for working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0050] Figure 1 A cross-sectional view of a modular multi-level gradient forming device according to the present invention;

[0051] Figure 2 A front view of a modular multi-level gradient forming device according to the present invention;

[0052] Figure 3 A side view of a modular multi-level gradient forming device according to the present invention;

[0053] Figure 4 An axonometric view of a modular multi-level gradient forming device according to the present invention;

[0054] Figure 5 It is a structural schematic diagram of the hydraulic assist device of the modular multi-level gradient forming equipment of the present invention;

[0055] Figure 6 It is a structural schematic diagram of a split upper module of a modular multi-level gradient forming device of the present invention;

[0056] Figure 7 This is a schematic structural diagram of the integrated base of the modular multi-level gradient forming device of the present invention;

[0057] Figure 8 It is a schematic diagram of the forming process of the modular multi-level gradient forming device of the present invention.

[0058] The figure shows:

[0059] Split upper die set 1 hydraulic channel 313

[0060] Upper mold block 11 hydraulic cavity 314

[0061] Lifting block 12 Pressing block 32

[0062] Flange linear bearing 13 boss structure 321

[0063] Integrated base 2 injection port 3211

[0064] Bottom mold 21 Hydraulic rod 33

[0065] Positioning pin 211 Pressing ring 34

[0066] Guide column 22 Oil seal seat 35

[0067] Spring 23 Piston 36

[0068] Hydraulic auxiliary device 3 retaining ring 37

[0069] Hydraulic cylinder 31 shaft sleeve 38

[0070] Cylinder 311 Sheet 4

[0071] Cylinder head 312 DETAILED DESCRIPTION

[0072] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0073] Example 1

[0074] This embodiment provides a modular multi-level gradient forming apparatus comprising a split upper die assembly 1, an integrated base 2, and a hydraulic assist device 3. The split upper die assembly 1 comprises multiple independent upper die blocks 11, which can be raised and lowered on the integrated base 2 to extrude and form a sheet material 4. The effective die surfaces of the split upper die assembly 1 and the integrated base 3 are configured based on the topography of the target part.

[0075] The hydraulic assist device 3 comprises a hydraulic cylinder 31, a pressure block 32, multiple hydraulic rods 33, and multiple pressure rings 34. The hydraulic cylinder 31 is used to mount the hydraulic rods 33 and provide hydraulic power to them. The pressure block 32 is mounted within the hydraulic cylinder 31 and is equipped with multiple boss structures 321. These boss structures 321 correspond one-to-one with the hydraulic rods 33, and their lower surfaces are capable of abutting one end of the limiting hydraulic rod 33. The hydraulic rod 33 is mounted on the hydraulic cylinder 31 and can be raised and lowered within the hydraulic cylinder 31. One end of the boss structure 321 guides the boss structure 321, and the other end guides the upper mold block 11. The pressure ring 34 is mounted at the other end of the hydraulic rod 32 and corresponds one-to-one with the upper mold block 11. The lower surface of the pressure ring 34 abuts and pushes the upper mold block 11. The lower surfaces of the boss structures 321 decrease in height from the center toward the sides, while the lower surfaces of the pressure rings 34 increase in height from the center toward the sides.

[0076] The split upper mold assembly 1 further includes a lifting block 12 . The lifting block 12 is mounted on the upper mold block 11 . The other end of the hydraulic rod 33 passes through the lifting block 12 and is guided toward the upper mold block 11 . The hydraulic rod 33 and the lifting block 12 are movable relative to each other. When the hydraulic rod 33 rises, it drives the lifting block 12 via the pressure ring 34 , thereby driving the upper mold block 11 upward.

[0077] The hydraulic cylinder 31 includes a cylinder body 311 and a cylinder head 312. The cylinder body 311 is provided with a hydraulic channel 313 for mounting the hydraulic rod 33. The cylinder head 312 is connected to the cylinder body 311, and the pressure block 32 is fixed at the connection between the cylinder head 312 and the cylinder body 311. The hydraulic rod 33 is mounted within the hydraulic channel 313 and is capable of rising and falling within the hydraulic channel 313. A hydraulic cavity 314 is formed between the cylinder head 312 and the cylinder body 311, and the hydraulic cavity 314 is connected to the hydraulic channel 313. The boss structure 321 is provided with an injection port 3211, and the hydraulic cavity 314 is connected to the hydraulic channel 313 through the injection port 3211.

[0078] The hydraulic assist device 3 also includes an oil seal seat 35 and a piston 36. The oil seal seat 35 is mounted on the inner wall of the hydraulic passage 313. The hydraulic rod 33 passes through the oil seal seat 35 and is movable relative to the oil seal seat 35. The piston 36 is mounted on the hydraulic rod 33 and is movable within the hydraulic passage 313.

[0079] The integrated base 2 includes: a bottom mold 21, a plurality of guide pillars 22 and a plurality of springs 23. The bottom mold 21 is used to extrude the sheet material 4 together with the upper mold block 11. The guide pillars 22 are provided on the bottom mold 21 for mounting the upper mold block 11. The springs 23 are sleeved on the guide pillars 22 and are located between the bottom mold 21 and the upper mold block 11. The upper mold block 11 is mounted on the guide pillars 22, and the plurality of upper mold blocks 11 are arranged in sequence corresponding to the length direction of the sheet material 4, and can be independently raised and lowered on the guide pillars 22. A positioning pin 211 is provided on the bottom mold 21, and the positioning pin 211 is used to position the sheet material 4; a positioning pin hole corresponding to the positioning pin 211 is provided on the upper mold block 11.

[0080] This embodiment also provides a modular multi-level gradient forming method, which uses the above-mentioned modular multi-level gradient forming device; specifically, it includes the following steps:

[0081] Step S1: Install the modular multi-level gradient forming device on a press, connect the bottom mold 21 of the integrated base 2 to the fixed end of the press, and connect the cylinder head 312 of the hydraulic auxiliary device 3 to the execution end of the press.

[0082] Step S2: Before the target part is formed, the hydraulic cylinder 31 is pressurized to fully extend the hydraulic rod 33 and maintain a preset pressure so that the hydraulic rod 33 does not retract when subjected to the reaction force of the split upper die assembly 1 .

[0083] Step S3: The heights of the lower surfaces of the pressing rings 34 connected to the hydraulic rods 33 are different. The height of the lower surface of the pressing ring 34 located in the middle is the smallest. The heights of the lower surfaces of the multiple pressing rings 34 from the middle to both sides increase successively, so that the press execution end is pressed down, driving the hydraulic auxiliary device 3 to press down. The pressing ring 34 located in the middle first contacts the upper mold block 11 located in the middle, so that the middle part of the sheet 4 begins to form. After the upper mold block 11 located in the middle is pressed to the bottom, the step ends. At this time, the degree of downward pressure of the multiple upper mold blocks 11 from the middle to both sides decreases successively.

[0084] Step S4: The lower surfaces of the boss structures 321 corresponding to the hydraulic rods 33 have different heights. The lower surface height of the boss structure 321 located in the middle is the highest. The lower surface heights of the multiple boss structures 321 from the middle to the sides decrease in sequence, so that the hydraulic auxiliary device 3 is depressurized. Then, the press actuator continues to press downward, and the hydraulic rods 33 retract until they abut against the boss structures 321 on the pressing block 32. During this process, the hydraulic rods 33 located on the two sides first abut against the boss structures 321, and the two ends of the sheet 4 begin to form. As the press actuator continues to press downward, the forming area of ​​the sheet 4 gradually extends from the two ends to the middle. After all the upper mold blocks 11 are pressed to the bottom, this step ends.

[0085] Step S5: The press execution end is lifted, and the pressing ring 34 hooks the lifting block 12 on the upper mold block 11, driving the upper mold block 11 to lift to the initial position, and the target part is demoulded, and the whole forming process is completed.

[0086] This embodiment relates to the technical field of metal plastic forming, and provides a modular multi-level gradient forming method and forming equipment. The system constructs an intelligent forming system through the innovative integration of a modular reconfigurable mold array and a multi-axis linkage hydraulic drive mechanism.

[0087] In order to address the technical bottlenecks such as excessive instantaneous load in traditional one-step stamping with integral dies, the inability of existing roll bending processes to construct complex three-dimensional topological structures due to the linear progressive deformation characteristics, and the motion interference and non-uniform strain accumulation in traditional roll punching during multi-curvature collaborative forming (especially the problems of sheet metal positioning drift and cross-sectional distortion caused by changes in cross-sectional curvature of double-arc workpieces), this embodiment proposes a discrete dynamic forming architecture based on a modular hydraulic drive unit.

[0088] This embodiment adopts an integrated base and a split upper die structure with distributed hydraulic drive, achieving low-load forming through three-stage timing control:

[0089] In the first stage, the central mold unit takes the lead in pressing down along the normal direction. When it reaches the preset initial stroke, it triggers the adjacent mold blocks on both sides to start pressing down synchronously. As the mold blocks on both sides complete the same stroke, the system automatically activates the outer mold blocks to join the forming process. Throughout the first stage, the middle mold continues to maintain the leading downward pressure state, forming a dynamic gradient pressure sequence between the modules. When the middle mold is pressed down to the lowest point, the first stage ends.

[0090] In the second stage, the pressing process starts from the outermost mold block, automatically compensating for the gradient gaps between the modules; finally, all the mold blocks are adjusted to the same plane to complete the forming process;

[0091] In the third stage, all mold blocks are lifted up to realize the demolding process. Through this step-by-step triggered collaborative working mechanism, combined with real-time displacement monitoring and adjustment, the sheet forming load is effectively dispersed, which greatly reduces the equipment load and is used for the precision forming of complex curved surface components of ultra-high strength alloys.

[0092] Example 2

[0093] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0094] like Figures 1 to 3 As shown, this embodiment provides a novel modular multi-level gradient forming device, comprising: a hydraulic auxiliary device 3 for realizing gradient forming, a split upper mold assembly 1 and an integrated base 2.

[0095] like Figure 5 As shown, the hydraulic auxiliary device 3 includes: a cylinder body 311, a cylinder body 312, a pressure block 32, an oil seal seat 35, a piston 36, a hydraulic rod 33, a pressure ring 34, a retaining ring 37, a sleeve 38 and related standard parts.

[0096] The cylinder body 311 provides support for the oil seal seat 35 and the piston 36; the piston 36 is threadedly connected to the hydraulic rod 33; the hydraulic rod 33 is threadedly connected to each pressure ring 34, and the pressure ring 34 will act on the split upper mold assembly 1 to apply pressure to drive the plate to form; the pressure block 32 is fitted with the cylinder body 311 and the cylinder body 312, and the close connection between the cylinder cover 312 and the cylinder body 311 provides support for the pressure block 32, wherein the pressure block 32 provides a limiting function for the piston 36; the retaining ring 37 is split for easy installation, and it fixes and supports the oil seal seat 35 together with the shaft sleeve 38 and the standard shaft.

[0097] like Figure 6 As shown, the split upper mold assembly 1 includes: several independent upper mold blocks 11, flange linear bearings 13, lifting blocks 12 and related standard parts; the several independent upper mold blocks 11 are divided by the overall upper mold; the flange linear bearings 13 are connected to the upper mold blocks 11 and are used for the independent up and down sliding of the upper mold blocks 11; the lifting blocks 12 are fixedly connected to the upper mold blocks 11 and are used to lift the split upper mold assembly 1 after the target part is formed.

[0098] like Figure 7 As shown, the integrated base includes a bottom mold 21 and a guide column 22. The guide column 22 is tightened with the bottom mold 10 by interference fit, providing a motion track for the split upper mold assembly.

[0099] Each of the several independent upper mold blocks 11 corresponds to a separate hydraulic rod 33; to simplify the assembly, the drive oil circuits are interconnected. The annular bosses on the pressure blocks 32 have varying heights, ensuring that each hydraulic rod 33 retracts to a different degree, as shown in the figure. The bottom mold 21 is equipped with locating pins 211 for positioning the sheet 4. The center upper mold block 11 is machined with corresponding locating pin holes.

[0100] The split upper die assembly 1 can only move relative to the bottom die 21 along the axial direction of the guide column 22 under the constraints of the guide column 22 and the flange linear bearing 13. The effective die surface of the split upper die assembly 1 and the integrated base 2 is designed according to the morphology of the target part.

[0101] The following describes in detail the specific implementation method of the roof beam parts forming process with the new modular multi-level gradient forming equipment of this embodiment. The specific implementation method of this embodiment includes the following steps:

[0102] Step S1, determining the basic dimensions of the modular multi-level gradient forming equipment according to the installation conditions, load conditions, and operating environment, designing and manufacturing non-standard parts, and purchasing standard parts.

[0103] Step S2, performing initial assembly of the parts and checking whether the parts can move relative to each other as preset;

[0104] In step S3, the modular multi-level gradient forming device is installed on a press, such as a hydraulic press or a stamping press. The integrated base 2 is connected to the fixed end of the press, such as the fixed platen of a hydraulic press or the work surface of a stamping press. The cylinder 312 is connected to the actuating end of the press, such as the piston of a hydraulic press or the die of a stamping press.

[0105] Step S4, the hydraulic auxiliary device is controlled by a separate oil circuit, and pressurized before the target part is formed, so that the hydraulic rod 33 is fully extended, as shown in FIG. Figure 8 As shown, sufficient pressure is maintained so that the hydraulic rod 33 does not retract when subjected to the reaction force of the split upper die set 1.

[0106] In step S5, the press machine executes downward pressure, driving the hydraulic auxiliary device 3 to press downward. Each hydraulic rod 33 is fixed with a pressure ring 34 of different heights. The middle pressure ring 34 has the largest height, and the height decreases towards both sides. The middle pressure ring 34 first contacts the upper mold block 11, and the middle part of the sheet 4 begins to form. This step ends when the middle upper mold block 11 is pressed to the bottom. At this time, the downward pressure of the upper mold blocks 11 on both sides decreases in sequence. The device and the sheet state, such as Figure 8 shown.

[0107] In step S6, the hydraulic auxiliary device 3 releases pressure, the press execution end continues to press down, and the hydraulic rod 33 retracts until it contacts the pressing block 32. During this process, the rods 33 at both ends first contact the pressing block 32, and the two ends of the sheet 4 begin to form. As the press continues to press down, the forming area of ​​the sheet 4 gradually extends from the two ends to the middle. This step ends when all the upper mold blocks 11 are pressed to the bottom. The device and the sheet state are as follows: Figure 8 shown.

[0108] In step S7, the press executes the lifting of the end, the pressing ring 34 hooks the lifting block 12 and drives the upper mold block 11 to lift to the initial position, the target part is demoulded, and the whole forming process is completed.

[0109] In response to the limitations of existing multi-curve variable-section workpiece forming, this embodiment provides a new modular multi-level gradient forming equipment and forming method to solve the problem of producing high-strength steel multi-curve variable-section workpieces using traditional forming methods.

[0110] This embodiment solves the problem of high-strength steel parts with multiple curved and variable cross-sections being difficult to produce using traditional forming processes. This embodiment offers a flexible process suitable for forming parts of various complex shapes. This embodiment also features a simple structure, manageable costs, and no special requirements for operating conditions.

[0111] The present invention solves the problem that multi-radian variable-section high-strength steel parts are difficult to produce using traditional forming processes.

[0112] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0113] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A modular multi-level gradient forming device, characterized in that: include: A split upper die assembly (1), an integrated base (2), and a hydraulic auxiliary device (3); The split upper die assembly (1) comprises a plurality of upper die blocks (11) that are independent of each other, and the upper die blocks (11) are capable of moving up and down on the integrated base (2) to perform extrusion molding on the sheet material (4); The hydraulic auxiliary device (3) comprises: a hydraulic cylinder (31), the hydraulic cylinder (31) being used to install a hydraulic rod (33) and provide hydraulic power to the hydraulic rod (33); A pressure block (32), the pressure block (32) is arranged in the hydraulic cylinder (31), a plurality of boss structures (321) are provided on the pressure block (32), the boss structures (321) are arranged in a one-to-one correspondence with the hydraulic rod (33), and the lower surface of the boss structure (321) can abut against one end of the hydraulic rod (33) to limit the position; A plurality of hydraulic rods (33), each of which is mounted on the hydraulic cylinder (31) and is capable of moving up and down on the hydraulic cylinder (31), with one end of the hydraulic rod guiding the boss structure (321) and the other end guiding the upper mold block (11); A plurality of pressing rings (34), each of which is provided at the other end of the hydraulic rod (32) and corresponds to the upper mold block (11) in a one-to-one manner, and the lower surface of the pressing ring (34) can abut against and push the upper mold block (11); The heights of the lower surfaces of the plurality of boss structures (321) decrease from the middle to both sides, and the heights of the lower surfaces of the plurality of pressing rings (34) increase from the middle to both sides.

2. The modular multi-level gradient forming device according to claim 1, characterized in that: The split upper mold assembly (1) further comprises: A lifting block (12), the lifting block (12) being arranged on the upper mold block (11); The other end of the hydraulic rod (33) passes through the lifting block (12) and guides to the upper mold block (11), and the hydraulic rod (33) and the lifting block (12) can move relative to each other; When the hydraulic rod (33) rises, it can drive the lifting block (12) through the pressure ring (34), and then drive the upper mold block (11) to rise.

3. The modular multi-level gradient forming device according to claim 1, characterized in that: The hydraulic cylinder (31) comprises: A cylinder body (311), wherein a hydraulic channel (313) is provided on the cylinder body (311), and the hydraulic channel (313) is used for installing the hydraulic rod (33); a cylinder cover (312), the cylinder cover (312) being connected to the cylinder body (311), and the pressing block (32) being fixed at a connection position between the cylinder cover (312) and the cylinder body (311); The hydraulic rod (33) is installed in the hydraulic channel (313) and can be lifted and lowered in the hydraulic channel (313); A hydraulic chamber (314) is formed between the cylinder cover (312) and the cylinder body (311), and the hydraulic chamber (314) is in communication with the hydraulic channel (313).

4. The modular multi-level gradient forming device according to claim 3, characterized in that: An injection port (3211) is provided on the boss structure (321), and the hydraulic cavity (314) is connected to the hydraulic channel (313) through the injection port (3211).

5. The modular multi-level gradient forming device according to claim 3, characterized in that: The hydraulic auxiliary device (3) further comprises: an oil seal seat (35), the oil seal seat (35) being arranged on the inner side wall of the hydraulic channel (313), the hydraulic rod (33) passing through the oil seal seat (35), and the hydraulic rod (33) being capable of relative movement with the oil seal seat (35); A piston (36) is provided on the hydraulic rod (33) and is movable in the hydraulic channel (313).

6. The modular multi-level gradient forming device according to claim 1, characterized in that: The integrated base (2) comprises: A bottom die (21), the bottom die (21) being used for extruding the sheet material (4) together with the upper die block (11); a plurality of guide posts (22), the guide posts (22) being arranged on the bottom mold (21) and being used for mounting the upper mold block (11); a plurality of springs (23), wherein the springs (23) are sleeved on the guide pillars (22) and located between the bottom mold (21) and the upper mold block (11); The upper mold block (11) is installed on the guide column (22), and a plurality of the upper mold blocks (11) are arranged in sequence corresponding to the length direction of the sheet (4) and can be independently raised and lowered on the guide column (22).

7. The modular multi-level gradient forming device according to claim 6, characterized in that: A positioning pin (211) is provided on the bottom mold (21), and the positioning pin (211) is used for positioning the sheet material (4); A positioning pin hole is provided on the upper mold block (11) corresponding to the positioning pin (211).

8. The modular multi-level gradient forming device according to claim 1, characterized in that: The effective mold surfaces of the split upper mold assembly (1) and the integrated base (3) are set according to the morphology of the target part.

9. A modular multi-level gradient forming method, characterized in that: A modular multi-level gradient forming device according to any one of claims 1 to 8; The specific steps include: Step S1: installing the modular multi-level gradient forming device on a press, connecting the bottom mold (21) of the integrated base (2) to the fixed end of the press, and connecting the cylinder head (312) of the hydraulic auxiliary device (3) to the execution end of the press; Step S2: before the target part is formed, the hydraulic cylinder (31) is pressurized to fully extend the hydraulic rod (33), and a preset pressure is maintained so that the hydraulic rod (33) does not retract when subjected to a reaction force from the split upper die set (1); Step S3: the execution end of the press is pressed downward, driving the hydraulic auxiliary device (3) to press downward, and the pressing ring (34) located in the middle first contacts the upper mold block (11) located in the middle, so that the middle part of the sheet (4) begins to be formed. After the upper mold block (11) located in the middle is pressed to the bottom, the step ends. At this time, the degree of downward pressure of the multiple upper mold blocks (11) from the middle to the two sides decreases in sequence; Step S4: depressurize the hydraulic auxiliary device (3), and then continue to press down the execution end of the press, and the hydraulic rod (33) retracts until it abuts against the boss structure (321) on the pressing block (32). During this process, the hydraulic rods (33) located on the two sides first abut against the boss structure (321), and the two ends of the sheet (4) begin to form. As the execution end of the press continues to press down, the forming area of ​​the sheet (4) gradually extends from the two ends to the middle. After all the upper mold blocks (11) are pressed to the bottom, this step ends. Step S5: The press execution end is lifted, and the pressing ring (34) hooks the lifting block (12) on the upper mold block (11), driving the upper mold block (11) to be lifted to the initial position, the target part is demoulded, and the whole forming process is completed.

10. The modular multi-level gradient forming method according to claim 9, characterized in that: In step S3, the heights of the lower surfaces of the pressing rings (34) connected to the hydraulic rods (33) are different, the lower surface height of the pressing ring (34) located in the middle is the smallest, and the heights of the lower surfaces of the pressing rings (34) from the middle to the sides increase in sequence; In step S4, the heights of the lower surfaces of the boss structures (321) corresponding to the hydraulic rods (33) are different, the lower surface height of the boss structure (321) located in the middle is the largest, and the heights of the lower surfaces of the multiple boss structures (321) decrease from the middle to the sides.

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