A current zone customized rib plate electric assisted forming tool and process

Abstract

The present invention discloses an electric-assisted forming tool for rib plate parts with customized current partitioning, comprising an integrated clamping electrode assembly disposed on both sides of the wall panel and a pressing electrode assembly disposed on both sides of the wall panel; the integrated clamping electrode assembly comprises a wall panel electrode clamp clamped on the edge of the wall panel, a transverse rib electrode clamp clamped at the end of the transverse rib and insulated from the wall panel electrode clamp, at least one wall panel electrode clamp or transverse rib electrode clamp in the integrated clamping electrode assembly is energized separately or the wall panel electrode clamp and the transverse rib electrode clamp are energized simultaneously; the pressing electrode assembly comprises a pressing block placed on the edge of the top surface of the wall panel, a longitudinal rib electrode clamp clamped at the end of the longitudinal rib and insulated from the pressing block, at least one of the pressing block and each longitudinal rib electrode clamp is energized. The present invention realizes the separated integrated clamping of the plate ribs and the separation / synchronous current supply of the dual regions of the plate ribs through a fixture, realizes the active control of the current distribution, direction and action domain, realizes the "zonal customization" of the energy field and the nearly uniform forming of the complex component as a whole.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal extrusion-assisted forming, and specifically relates to an electric-assisted forming tool and process for ribbed plate parts customized by current partitioning. Background Art

[0002] Currently, the forming and manufacturing of aluminum alloy integral wall panels in the aerospace field mostly uses mature process methods such as chemical milling grid composite pressing, rolling, stretching, or shot peening. With the continuous development of high-end equipment manufacturing technology, processes such as creep aging forming, electromagnetic progressive forming, and multi-stage integral progressive aging composite forming have also been applied to the forming and manufacturing of aluminum alloy integral wall panels, especially large-scale, high-strength aluminum alloy integral ribbed wall panels. However, because high-temperature titanium alloys are mostly non-aging-hardened alloys, with high processing temperatures, narrow processing windows, and large springback after deformation, the use of conventional cold or warm deformation methods to form grid-ribbed integral wall panels requires high equipment tonnage, and forming defects such as cracking at the rib root and instability deformation at the upper end of the rib are prone to occur during the forming process. In addition, the final dimensional accuracy of the formed part is difficult to guarantee.

[0003] Electric pulse-assisted forming (EPF) can significantly reduce forming loads and increase the material's bending forming limit by leveraging the electroplastic effect, effectively preventing cracking at the rib root during forming. Furthermore, it can rapidly provide thermal deformation conditions by utilizing the Joule heating generated by the material's self-resistance, compensating for heat loss during deformation. Compared to resistance furnace heating, this method is expected to significantly increase heating speeds, reduce energy consumption, and reduce tooling costs. EPF technology is expected to produce high-temperature titanium alloy panels with enhanced structural strength. However, the current loading method for EAF titanium alloy panels currently relies on uniform current loading of the ribs / plates using conductive electrodes. The spatial distribution of current is concentrated only within the ribs / plates, with the current flow pattern and current parameters being consistent across all ribs, making it difficult to actively control the current distribution. However, in the forming process of multi-curvature panels, the uneven geometric distribution of the components and intermittent localized loading of the mold and panel lead to uneven deformation across different regions. A single current parameter results in consistent electrothermal history across different deformation zones, making it impossible to precisely match the electrical, thermal, and mechanical parameters of the locally loaded zones. This further complicates deformation coordination across the deformation zones and can easily lead to cracking at the rib root and rib instability in the transition zone. Therefore, customizing the current loading mode and current process parameters in different deformation zones and matching the deformation characteristics of the local loading area of the plate is an effective way to achieve high-precision forming of multi-curvature wall panels. Summary of the Invention

[0004] In order to solve the deficiencies in the existing technology, the patent of this invention provides a current-zone customized electric-assisted forming tooling and process for rib-plate parts. While the electrodes are clamped together by the clamp to separate the plate and rib, the circuit design realizes separation / synchronous current supply in the dual areas of the plate and rib, realizing active control of current distribution, direction and scope, realizing "zone customization" of the energy field and nearly uniform forming of the complex components as a whole.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0006] A current-zone customized rib plate electrically assisted forming tool is used to assist in the stamping and bending of a grid-rib integral wall panel. The grid-rib integral wall panel is integrally formed by the wall panel and a plurality of horizontal and vertical ribs crisscrossing above the wall panel. It includes an integrated clamping electrode assembly provided on the left and right sides of the wall panel and a pressing electrode assembly provided on the front and rear sides of the wall panel.

[0007] Each integrated clamping electrode assembly includes a wall plate electrode clamp clamped on the edge of the wall plate, and a transverse rib electrode clamp clamped on the end of the transverse rib and insulated from the wall plate electrode clamp. The wall plate electrode clamp and the transverse rib electrode clamp on the same side are connected to a same-polarity electrode end, and the wall plate electrode clamp and the transverse rib electrode clamp on the other same side are connected to a different-polarity electrode end via a transverse rib switch assembly. The transverse rib switch assembly controls whether the wall plate electrode clamp or the transverse rib electrode clamp in at least one integrated clamping electrode assembly is energized individually or whether the wall plate electrode clamp and the transverse rib electrode clamp are energized simultaneously.

[0008] The edge clamping electrode assembly includes an edge clamping block placed on the edge of the top surface of the wall panel, and a longitudinal rib electrode clamp clamped at the end of the longitudinal rib and insulated from the edge clamping block. The edge clamping block and the longitudinal rib electrode clamp on the same side are connected to an electrode end of the same polarity, and the edge clamping block and the longitudinal rib electrode clamp on the other side are connected to an electrode end of the opposite polarity through the longitudinal rib switch assembly. The longitudinal rib switch assembly enables at least one of the edge clamping block and each longitudinal rib electrode clamp to be energized.

[0009] Furthermore, the wall panel electrode clamp includes a connecting block, a fixed clamp fixedly arranged on one side of the top of the connecting block, and a movable clamp rotatably arranged at the bottom of the connecting block and located below the fixed clamp. A fixed insulating handle is fixedly arranged on the other side of the top of the connecting block, and a movable insulating handle fixedly connected to the end of the movable clamp is arranged below the fixed insulating handle. At least one first reset spring is connected between the movable insulating handle and the fixed insulating handle.

[0010] Furthermore, the transverse rib electrode clamp includes cylinders fixedly arranged on both sides of the top surface of the fixed clamp, the two cylinders are arranged opposite to each other, and the output shaft end of each cylinder is fixedly connected to the vertically arranged transverse rib clamp.

[0011] Furthermore, a first insulating layer is provided between the cylinder and the fixed clamp, and a second insulating layer is provided between the output shaft end of the cylinder and the transverse rib clamp.

[0012] Furthermore, tooth groove structures are provided on the surfaces opposite to the fixed clamp and the movable clamp, and on the side surfaces opposite to the two transverse rib clamps.

[0013] Furthermore, the transverse rib switch assembly includes a multi-way first single-pole single-throw switch corresponding to and arranged in parallel with the integrated clamping electrode assembly, and a single-pole three-throw switch is connected in series to each first single-pole single-throw switch. The three contacts of the single-pole three-throw switch are respectively connected to the wall panel electrode clamp or to the transverse rib electrode clamp or to the wall panel electrode clamp and the transverse rib electrode clamp at the same time.

[0014] Furthermore, a plurality of slots corresponding to the ends of the longitudinal ribs are provided in the edge clamp, and the longitudinal rib electrode clamp includes two second reset springs respectively fixedly connected to the inner walls on both sides of the slot, and guide blocks respectively fixedly provided on both sides of the bottom surface of the slot, and each second reset spring is connected to a vertically provided longitudinal rib clamp at one end away from the side wall of the slot.

[0015] Furthermore, a third insulating layer is provided between the second return spring and the edge clamp and / or the longitudinal rib clamp, and the guide block is made of insulating material.

[0016] Furthermore, the longitudinal rib switch assembly includes a plurality of second single-pole single-throw switches corresponding to and connected in parallel with the edge clamp and the longitudinal rib electrode clamp, and each second single-pole single-throw switch is respectively connected to the edge clamp and each longitudinal rib clamp.

[0017] A process for electrically assisting the forming of ribs and plates with customized current zones is also provided, which is applied to the aforementioned electrically assisting the forming of ribs and plates with customized current zones, and comprises the following steps:

[0018] S1. Workpiece assembly: The grid rib wall panel to be stamped is accurately placed on the bending die set on the bottom plate of the hydraulic press, and the bending punch and the bending die are aligned;

[0019] S2. Electrode clamping: Place the two edge-holding electrode assemblies on the front and rear ends of the wallboard respectively, so that the edge-holding blocks contact the ends of the wallboard and each longitudinal rib electrode clamp clamps the longitudinal rib end accordingly; clamp the wallboard electrode clamps of the integrated clamping electrode assembly on the left and right edges of the wallboard accordingly, start the cylinder to drive the transverse rib electrode clamp to move and clamp the transverse rib end accordingly;

[0020] S3. Process parameter setting: Based on the optimal forming process parameters of the grid rib wall panel to be formed and its uneven deformation law, adjust the working mode of the horizontal rib switch assembly and the longitudinal rib switch assembly, and set the separation / synchronous power-on state of the multi-plate rib dual area;

[0021] S4. Power-on heating: According to the preset power-on sequence, a pulse power generator is used to supply a forming operation current of preset power and current to some electrode clamps for a preset time, so that the sheet is locally heated to a preset forming temperature;

[0022] S5. Stamping and forming: According to the set energizing mode of the plate reinforcement in different areas, the bending punch and the bending die are controlled to cooperate to complete the forming process of the energized area of the sheet metal;

[0023] S6. Repeat steps 4 and 5 to perform zoned voltage bending on different rib areas. When the planar grid rib wall panel is formed into the designed geometric shape, turn off the pulse current generator, unload the edge pressing electrode assembly and the integrated clamping electrode assembly, and remove the grid rib wall panel that has completed press bending.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The present invention combines a pneumatically driven transverse rib electrode clamp with a manually operated wall panel electrode clamp to form an integrated clamping electrode assembly, which effectively realizes the integrated clamping of the grid ribs and wall panel ribs, and insulates the two sets of electrode clamps from each other through an insulating layer, while achieving the effect of zoned electrification of the transverse ribs and wall panels; an integrated edge clamping electrode assembly is formed by arranging a longitudinal rib electrode clamp inside the edge clamping block, and combined with a tensioning internal chuck structure design, it plays a role in edge clamping control during the press-bending forming process, achieving the effect of zoned electrification of the longitudinal ribs and wall panels; the integrated chuck design simplifies the assembly process and improves production efficiency, structurally realizing the integrated design of overall clamping fixation - zoned / overall conductive heating, optimizing the process flow, and realizing safe, efficient, and high-precision current direction control and electric-assisted forming;

[0026] 2. The present invention realizes the dual-area separation / synchronous current supply of multiple plate ribs through reasonable current zoning circuit design combined with the fixture design of the chuck separation electrode structure, thereby realizing the active control of current distribution, direction and "airspace" control of the scope, realizing the "zoning customization" of the energy field, actively constructing the uneven current / load mapping relationship, effectively coordinating the deformation behavior of different deformation zones, and realizing the overall nearly uniform forming of complex components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the three-dimensional structure of a grid rib integral wall panel that is bent and formed using the electric-assisted forming tooling for rib panels customized for current partitioning according to the present invention;

[0028] Figure 2 A schematic diagram of the overall structure of the electric-assisted forming tooling for ribs customized for current zoning of the present invention in use;

[0029] Figure 3 This is one of the three-dimensional structural schematic diagrams of the integrated clamping electrode assembly;

[0030] Figure 4 The second schematic diagram of the three-dimensional structure of the integrated clamping electrode assembly;

[0031] Figure 5 This is a schematic diagram of the current partition circuit structure of the transverse reinforcement wall panel;

[0032] Figure 6 is one of the three-dimensional structural schematic diagrams of the edge pressing electrode assembly;

[0033] Figure 7 The second schematic diagram of the three-dimensional structure of the edge pressing electrode assembly;

[0034] Figure 8 This is a schematic diagram of the current partition circuit structure of the longitudinal reinforcement wall panel.

[0035] In the figure: 1. Integrated clamping electrode assembly; 11. Wall plate electrode clamp; 111. Connecting block; 112. Fixed chuck; 113. Movable chuck; 114. Fixed insulating handle; 115. Movable insulating handle; 116. First return spring; 12. Transverse rib electrode clamp; 121. Cylinder; 122. Transverse rib chuck; 123. Push plate; 124. First insulating layer; 125. Second insulating layer; 2. Edge pressing electrode assembly; 21. Edge pressing block; 22. Longitudinal rib electrode clamp; 221. Second return spring; 222. Guide block; 223. Longitudinal rib chuck; 224. Connecting plate; 225. Third insulating layer; 100. Wall plate; 200. Transverse rib; 300. Longitudinal rib. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0037] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] The present invention provides a current zone customized rib plate electric assisted forming tool and process, which is used for Figure 1The auxiliary grid-rib integral wall panel shown is formed by stamping and bending. This grid-rib integral wall panel is integrally formed by a wall panel 100 and a plurality of transverse ribs 200 and longitudinal ribs 300 crisscrossing the upper portion of the wall panel. In this embodiment, the grid-rib integral wall panel is made of titanium alloy. There are three transverse ribs 200, labeled T1, T2, and T3, and three longitudinal ribs 300, labeled L1, L2, and L3. The following describes the specific structure and operating principle of the electrical auxiliary tooling for the rib panel using this grid-rib integral wall panel as the processing object.

[0040] See attached Figure 2 A current-zone customized electric-assisted forming tool for rib plates includes an integrated clamping electrode assembly 1 disposed on the left and right sides of the wall panel 100 and a pressing electrode assembly 2 disposed on the front and rear sides of the wall panel 100.

[0041] like Figure 3 and Figure 4 As shown, each integrated clamping electrode assembly 1 includes a wall plate electrode clamp 11 clamped to the edge of the wall plate 100, and a transverse rib electrode clamp 12 clamped to the end of the transverse rib 200 and insulated from the wall plate electrode clamp 11. The wall plate electrode clamp 11 and transverse rib electrode clamp 12 on the same side are connected to a like electrode terminal (e.g., the positive electrode) of a pulse power generator (not shown in the figure), while the wall plate electrode clamp 11 and transverse rib electrode clamp 12 on the other side are connected to an opposite electrode terminal (e.g., the negative electrode) of the pulse power generator via a transverse rib switch assembly. The transverse rib switch assembly controls whether the wall plate electrode clamp 11 or transverse rib electrode clamp 12 in at least one integrated clamping electrode assembly 1 is energized individually or simultaneously.

[0042] Specifically, the wall panel electrode clamp 11 includes a connecting block 111, a fixed clamp 112 fixedly arranged on one side of the top of the connecting block 111, and a movable clamp 113 rotatably arranged at the bottom of the connecting block 111 and located below the fixed clamp 112. The fixed clamp 112 and the connecting block 111 are integrally formed or fixedly assembled by screw connection or other means. A through hole is provided at the bottom end of the connecting block 111, and the connecting end of the movable clamp 113 is inserted into the through hole. A shaft rod is inserted into the connecting block 111 and placed horizontally in the through hole. The shaft rod is inserted into the connecting end of the movable clamp 113, so that the movable clamp 113 can swing up and down around the shaft rod. After the movable clamp 113 swings downward, the two clamps are in an open state, so that the edge of the wall panel 100 enters between the two clamps; after the movable clamp 113 swings upward, it can cooperate with the fixed clamp 112 to clamp the upper and lower surfaces of the wall panel 100 respectively, thereby realizing the clamping function. Both clamps are made of a conductive metal (such as copper) and are connected to the pulse current output electrodes of an external pulse power generator via cables. The wall panel electrode clamps 11 on either side of the wall panel 100 are connected to output electrodes of different electrical properties, respectively, allowing the wall panel 100 to be connected to the current circuit. To improve the clamping surface of the two clamps while also meeting the need to accommodate the ends of the transverse ribs 200 in the middle, in this embodiment, both clamps are configured as a comb-like structure that approximates a "Y" shape, with a space notch between the clamping ends. To enhance the anti-slip effect of the clamping surfaces of the two clamps on the upper and lower surfaces of the wall panel and prevent the wall panel electrode clamps 11 from loosening or shifting, thereby affecting the conductive effect, the opposing surfaces of the fixed clamp 112 and the movable clamp 113 (specifically, the clamping locations on both sides of the bottom end of the fixed clamp 112 and the clamping locations on both sides of the top end of the movable clamp 113) are provided with a toothed groove structure, resulting in a non-planar clamping surface such as a wavy surface or a grid surface.

[0043] A fixed insulating handle 114 is fixedly mounted on the other side of the top of the connecting block 111. Below the fixed insulating handle 114 is a movable insulating handle 115 fixedly connected to the end of the movable chuck 113. Both the fixed insulating handle 114 and the movable insulating handle 115 are made of insulating material, allowing a user to safely clamp the wall panel electrode clamp 11 on the edge of the wall panel 100 by holding them. The end of the fixed insulating handle 114 is fixedly assembled to the connecting block 111 by means of plugging, bonding, or screwing, while the end of the movable insulating handle 115 is fixedly connected to one end of the movable chuck 113 located within the through-hole by means of plugging, bonding, or screwing. Thus, by operating the movable insulating handle 115 and the fixed insulating handle 114 to open and close, the movable chuck 113 and the fixed chuck 112 can be opened and closed accordingly. Three first return springs 116 are connected between the movable insulating handle 115 and the fixed insulating handle 114. After the person grips the two handles tightly and the movable clamp 113 cooperates with the fixed clamp 112 to clamp the upper and lower surfaces of the wall panel 100 respectively, the handles are released, and the first return spring 116 can automatically open the two handles, so that the two clamps are in a tensioned clamping state.

[0044] The transverse rib electrode clamp 12 includes a cylinder 121 fixedly mounted on both sides of the top surface of the fixed chuck 112. The two cylinders 121 are arranged opposite to each other, and the output shaft end of each cylinder 121 is fixedly connected to a vertically arranged transverse rib clamp 122. Specifically, the two cylinders 121 are fixedly connected to the top surface of the fixed chuck 122 by screws, and are respectively located on both sides of the vacant slot of the fixed chuck 122. The output shaft end of the cylinder 121 is fixedly connected to a push plate 123, and the two sides of the push plate 123 are fixedly connected to the ends of the guide rods on both sides of the cylinder body of the cylinder 122. The transverse rib clamp 122 is fixedly connected to the side of the push plate 123 by bonding or screw connection, so that the cylinders 121 on both sides can push the two transverse rib clamps 122 closer to or away from each other. During the process of clamping the wall panel 100 by the wall panel electrode clamp 11, the end of the transverse rib 122 is positioned within the vacant slot of the fixed clamp 112. Thus, the end of the transverse rib 122 is positioned between the two transverse rib clamps 122 on either side. After the wall panel electrode clamp 11 has completed clamping the wall panel 100, the cylinders 121 on either side are activated, driving the two transverse rib clamps 122 on either side to approach the sides of the transverse rib 200 and clamp the end of the transverse rib 200. Both transverse rib clamps 122 are made of a conductive metal material (such as copper) and are connected to the pulse current output electrodes of an external pulse power generator via cables. The transverse rib clamps 122 at both ends of the same transverse rib 200 are connected to output electrodes of different electrical properties, allowing the corresponding transverse rib 200 to be connected to the current circuit.

[0045] Preferably, a first insulating layer 124 is provided between the cylinder 122 and the fixed chuck 112, and a second insulating layer 125 is provided between the output shaft end of the cylinder 121 (specifically, the push plate 123) and the transverse rib chuck 122. By providing the first insulating layer 124 and the second insulating layer 125, it can be effectively ensured that the transverse rib electrode clamp 12 and the wall plate electrode clamp 11 are insulated from each other, facilitating the separate control of the two current loops. In this embodiment, the first insulating layer 124 and the second insulating layer 125 are both rectangular plates made of epoxy resin material, which ensures the insulation effect while also meeting the hardness requirements of the connection. Similarly, in order to enhance the reliability of the clamping between the two transverse rib chucks 122 and the side surfaces of the end of the transverse rib 200, a tooth groove structure similar to the above is provided on the opposite sides of the two transverse rib chucks 122. Further preferably, in order to achieve the same output thrust of the six cylinders 121 in the three integrated clamping electrode assemblies 1 on a single side and the synchronous extension and retraction of the output shaft, the air paths of the six cylinders 121 are arranged in series in sequence, so that the synchronous equal force output movement of the six cylinders 121 can be achieved through the same air supply path.

[0046] The transverse rib switch assembly includes a plurality of first single-pole single-throw switches corresponding to and arranged in parallel with the integrated clamping electrode assembly 1. Each first single-pole single-throw switch is connected in series with a single-pole three-throw switch. The three contacts of the single-pole three-throw switch are respectively connected to the wall plate electrode clamp 11 or to the transverse rib electrode clamp 12 or to both the wall plate electrode clamp 11 and the transverse rib electrode clamp 12. In this embodiment, the number of transverse ribs 200 is three, and correspondingly, the number of integrated clamping electrode assemblies 1 arranged on one side is also three. Therefore, as shown in FIG. Figure 5As shown, the first single-pole single-throw switch is set to three parallel circuits, marked as S1, S2 and S3 respectively. Each first single-pole single-throw switch is connected in series with a single-pole three-throw switch, marked as S10, S20 and S30 respectively. The three contacts of S10 are marked as K101, K102 and K103 respectively. Contact K101 is connected to the cable of the transverse rib electrode clamp 12 in the first integrated clamping electrode assembly 1, contact K103 is connected to the cable of the wall plate electrode clamp 11 in the integrated clamping electrode assembly 1, and contact K102 is simultaneously connected to the cables of the transverse rib electrode clamp 12 and the wall plate electrode clamp 11 in the integrated clamping electrode assembly 1. A diode protection circuit is introduced in the corresponding two cables to ensure the unidirectionality of the current. When S1 is closed and S10 is at contact K101, only the end of the first transverse rib 200 (T1) is energized. When S1 is closed and S10 is at contact K103, only the end of the wall panel 100 at the bottom of the first transverse rib 200 is energized. When S1 is closed and S10 is at contact K102, only the end of the first transverse rib 200 and the end of the wall panel 100 at its bottom are energized. The three contacts of S20 are labeled K201, K202, and K203, respectively; the three contacts of S30 are labeled K301, K302, and K303, respectively. The connection method between S20 and the electrode plates in the second integrated clamping electrode assembly 1 and S30 and the electrode plates in the third integrated clamping electrode assembly 1 is similar and will not be described in detail.

[0047] S1, S2 and S3 constitute the main control valve of the single-plate reinforcement circuit. The three-way control switch independently controls the on and off of the corresponding circuit. Through the combination of different circuit on and off states, the single-plate reinforcement, double-plate reinforcement and multi-plate reinforcement separation power control mode can be realized, thereby realizing the dual-area separation / synchronous power supply of the transverse reinforcement and multi-plate reinforcement.

[0048] like Figure 6 and Figure 7 As shown, the edge clamping electrode assembly 2 includes an edge clamping block 21 placed on the edge of the top surface of the wall panel 100, and a longitudinal rib electrode clamp 22 clamped at the end of the longitudinal rib 300 and insulated from the edge clamping block 21. The edge clamping block 21 and the longitudinal rib electrode clamp on the same side are connected to the same-polarity electrode end (such as the positive pole) of the pulse power generator, and the edge clamping block 21 and the longitudinal rib electrode clamp 22 on the other side are connected to the opposite-polarity electrode end (such as the negative pole) of the pulse power generator through the longitudinal rib switch assembly. The longitudinal rib switch assembly enables at least one of the edge clamping block 21 and each longitudinal rib electrode clamp 22 to be energized.

[0049] Specifically, the edge clamp 21 is a cubic structure made of a conductive metal material (such as copper). Its length matches the width of the front and rear ends of the bottom wall 100. Three notches are provided inside the edge clamp 21, corresponding to the ends of the longitudinal ribs 300. A through hole is provided in the middle of the bottom wall of the notch. When assembled, the edge clamp 21 is placed directly on the top edge of the front and rear ends of the bottom wall 100, and the ends of the three longitudinal ribs 300 pass through the through hole and stand in the three notches. The top end of the edge clamp 21 is connected to the pulse current output electrode of an external pulse power generator via a cable, so that the corresponding longitudinal ribs 300 can be connected to the current circuit.

[0050] The longitudinal rib electrode clamp 22 comprises two second return springs 221, each fixedly attached to the inner walls of the notch, and guide blocks 222, each fixedly mounted on either side of the notch's bottom surface. Each second return spring 221 is connected to a vertically mounted longitudinal rib clamp 223 at one end facing away from the notch's sidewall. A guide slot is defined at the top of the guide block 222, and a guide slider is fixedly mounted at the bottom end of the longitudinal rib clamp 223, which slides within the slot. Specifically, the guide block 222 is secured to the notch's bottom surface via any combination of plug-in, adhesive bonding, and screw connections. The slot is perpendicular to the side of the longitudinal rib 300. The sliding engagement of the guide slider with the slot allows the longitudinal rib clamp 223 to move horizontally, moving closer to or further from the end of the longitudinal rib 300. The second return spring 221 is positioned horizontally, with a connecting plate 224 fixedly attached to each end. The connecting plate 224 is screwed to the notch's sidewall and the side of the longitudinal rib clamp 223, respectively. When the edge clamp 21 is placed on the top surface of the wall panel 100 according to the preset position, the ends of the three longitudinal ribs 300 are respectively upright in the middle of the slot and between the two longitudinal rib clamps 223. Under the tensioning thrust of the second return spring 221, the longitudinal rib clamps 223 on both sides clamp the side walls on both sides of the ends of the longitudinal ribs 300.

[0051] Both longitudinal reinforcement clamps 223 are made of conductive metal material (such as copper) and are connected to the pulse current output electrodes of an external pulse power generator through cables. The longitudinal reinforcement clamps 223 at both ends of the same longitudinal reinforcement 300 are respectively connected to output electrodes with different electrical properties, so that the corresponding longitudinal reinforcement 300 can be connected to the current circuit.

[0052] Preferably, a third insulating layer 225 is provided between the connecting plates 224 at both ends of the second return spring 211 and the pressure block 21 and / or the longitudinal rib electrode clamp, and the guide block 222 is also made of an insulating material. By providing the third insulating layer 225 and setting the guide block 222 to an insulating material, it can be effectively ensured that the longitudinal rib clamp 223 and the pressure block 21 are insulated from each other, which facilitates the separate control of the two current loops. In this embodiment, the third insulating layer 225 and the guide block 222 are both rectangular plates made of epoxy resin material, which can ensure the insulation effect while ensuring the hardness requirements of the connection. Similarly, in order to enhance the reliability of the clamping of the two longitudinal rib clamps 223 and the side surfaces of the transverse rib 200, the opposite sides of the two longitudinal rib clamps 223 are also provided with a tooth groove structure similar to the above.

[0053] The longitudinal rib switch assembly includes multiple second single-pole single-throw switches corresponding to and connected in parallel with the edge clamp 21 and the longitudinal rib electrode clamp 22. Each second single-pole single-throw switch is connected to the edge clamp 21 and each longitudinal rib clamp 223. In this embodiment, the number of longitudinal ribs 300 is three, and correspondingly, the number of longitudinal rib electrode clamps 22 set on one side is also three, and the number of edge clamps 21 is one. Therefore, if Figure 8 As shown, the second single-pole, single-throw (SPST) switches are connected in parallel in four circuits, labeled S1, S2, S3, and S4. The outputs of S1, S2, and S3 are connected to the cables of the three longitudinal rib electrode clamps 22, respectively. These three second SPST switches, through different on / off combinations, enable simultaneous / separate energization of multiple ribs. The output of S4 is connected to the cables of the edge clamp 21, enabling individual current control of the wall panels 100. This circuit design enables separate / simultaneous energization of multiple longitudinal ribs in dual zones.

[0054] The present invention also provides a current zone customized rib plate electrically assisted forming process, which is applied to the current zone customized rib plate electrically assisted forming tool as described above, comprising the following steps:

[0055] S1. Workpiece assembly: The grid rib wall panel to be stamped is accurately placed on the bending die set on the bottom plate of the hydraulic press, and the bending punch and the bending die are aligned;

[0056] S2. Electrode clamping: Place the two edge-holding electrode assemblies 2 on the front and rear ends of the wall panel 100, respectively, so that the edge-holding blocks 21 contact and hold the ends of the wall panel 100, and each longitudinal rib electrode clamp 22 clamps the end of the longitudinal rib 300 accordingly; clamp the wall panel electrode clamps 11 of the integrated clamping electrode assembly 1 on the left and right edges of the wall panel 100 accordingly, and start the cylinder 121 to drive the two transverse rib clamps 122 of the transverse rib electrode clamp 12 to move relative to each other and clamp the ends of the transverse rib 200 accordingly;

[0057] S3. Process parameter setting: Based on the optimal forming process parameters of the grid rib wall panel to be formed and its uneven deformation law, adjust the working mode of the horizontal rib switch assembly 22 and the longitudinal rib switch assembly 22, and set the separation / synchronous power-on state of the multi-plate rib dual area;

[0058] S4. Power-on heating: According to the preset power-on sequence, a pulse power generator is used to supply a forming operation current of preset power and current to some electrode clamps for a preset time, so that the sheet is locally heated to a preset forming temperature;

[0059] S5. Stamping and forming: According to the set energizing mode of the plate reinforcement in different areas, the bending punch and the bending die are controlled to cooperate to complete the forming process of the energized area of the sheet metal;

[0060] S6 repeats steps 4 and 5, and performs zoned voltage bending for different plate rib areas. When the plane grid rib wall panel is formed into the designed geometric shape, the pulse current generator is turned off, the edge pressing electrode assembly 2 and the integrated clamping electrode assembly 1 are unloaded, and the grid rib wall panel that has completed press bending is removed.

[0061] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A current zone customized electric assisted forming tool for rib plate parts, characterized by: It includes an integrated clamping electrode assembly provided on the left and right sides of the wall panel, and a pressing electrode assembly provided on the front and rear sides of the wall panel; Each integrated clamping electrode assembly includes a wall plate electrode clamp clamped on the edge of the wall plate, and a transverse rib electrode clamp clamped on the end of the transverse rib and insulated from the wall plate electrode clamp. The wall plate electrode clamp and the transverse rib electrode clamp on the same side are connected to a same-polarity electrode end, and the wall plate electrode clamp and the transverse rib electrode clamp on the other same side are connected to a different-polarity electrode end via a transverse rib switch assembly. The transverse rib switch assembly controls whether the wall plate electrode clamp or the transverse rib electrode clamp in at least one integrated clamping electrode assembly is energized individually or whether the wall plate electrode clamp and the transverse rib electrode clamp are energized simultaneously. The edge clamping electrode assembly includes an edge clamping block placed on the edge of the top surface of the wall panel, and a longitudinal rib electrode clamp clamped at the end of the longitudinal rib and insulated from the edge clamping block. The edge clamping block and the longitudinal rib electrode clamp on the same side are connected to an electrode end of the same polarity, and the edge clamping block and the longitudinal rib electrode clamp on the other side are connected to an electrode end of the opposite polarity through the longitudinal rib switch assembly. The longitudinal rib switch assembly enables at least one of the edge clamping block and each longitudinal rib electrode clamp to be energized.

2. The electric-assisted forming tool for current zone customized ribs according to claim 1 is characterized in that: The wall plate electrode clamp includes a connecting block, a fixed clamp fixedly arranged on one side of the top of the connecting block, and a movable clamp rotatably arranged at the bottom of the connecting block and located below the fixed clamp. A fixed insulating handle is fixedly arranged on the other side of the top of the connecting block, and a movable insulating handle fixedly connected to the end of the movable clamp is arranged below the fixed insulating handle. At least one first reset spring is connected between the movable insulating handle and the fixed insulating handle.

3. The electric-assisted forming tool for current zone customized ribs according to claim 2, characterized in that: The transverse rib electrode clamp comprises cylinders fixedly arranged on both sides of the top surface of the fixed clamp, the two cylinders are arranged opposite to each other, and the output shaft end of each cylinder is fixedly connected to a vertically arranged transverse rib clamp.

4. The electric-assisted forming tool for current zone customized ribs according to claim 3 is characterized in that: A first insulating layer is provided between the cylinder and the fixed clamp, and a second insulating layer is provided between the output shaft end of the cylinder and the transverse rib clamp.

5. The electric-assisted forming tool for current zone customized ribs according to claim 3, characterized in that: Tooth groove structures are provided on the surfaces opposite to the fixed clamp and the movable clamp, and on the side surfaces opposite to the two transverse rib clamps.

6. The electric-assisted forming tool for current zone customized ribs according to any one of claims 1 to 5, characterized in that: The transverse rib switch assembly includes a multi-way first single-pole single-throw switch that is arranged in parallel with the integrated clamping electrode assembly, and a single-pole three-throw switch is connected in series to each first single-pole single-throw switch. The three contacts of the single-pole three-throw switch are respectively connected to the wall panel electrode clamp or the transverse rib electrode clamp or the wall panel electrode clamp and the transverse rib electrode clamp at the same time.

7. The electric-assisted forming tool for current zone customized ribs according to claim 1, characterized in that: The edge clamp is provided with a plurality of slots corresponding to the ends of the longitudinal ribs. The longitudinal rib electrode clamp includes two second return springs respectively fixedly connected to the inner walls on both sides of the slot, and guide blocks respectively fixedly arranged on both sides of the bottom surface of the slot. The end of each second return spring away from the side wall of the slot is connected to a vertically arranged longitudinal rib clamp.

8. The electric-assisted forming tool for current zone customized ribs according to claim 7, characterized in that: A third insulating layer is provided between the second return spring and the edge pressing block and / or the longitudinal rib clamp, and the guide block is made of insulating material.

9. The electric-assisted forming tool for current zone customized ribs according to claim 1, 7 or 8, characterized in that: The longitudinal rib switch assembly includes multiple second single-pole single-throw switches corresponding to and connected in parallel with the edge clamp and the longitudinal rib electrode clamp, and each second single-pole single-throw switch is respectively connected to the edge clamp and each longitudinal rib clamp.

10. A current zone customized rib plate electrically assisted forming process, applied to the current zone customized rib plate electrically assisted forming tooling according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Workpiece assembly: The grid rib wall panel to be stamped is accurately placed on the bending die set on the bottom plate of the hydraulic press, and the bending punch and the bending die are aligned; S2. Electrode clamping: Place the two edge-holding electrode assemblies on the front and rear ends of the wallboard respectively, so that the edge-holding blocks contact the ends of the wallboard and each longitudinal rib electrode clamp clamps the longitudinal rib end accordingly; clamp the wallboard electrode clamps of the integrated clamping electrode assembly on the left and right edges of the wallboard accordingly, start the cylinder to drive the transverse rib electrode clamp to move and clamp the transverse rib end accordingly; S3. Process parameter setting: Based on the optimal forming process parameters of the grid rib wall panel to be formed and its uneven deformation law, adjust the working mode of the horizontal rib switch assembly and the longitudinal rib switch assembly, and set the separation / synchronous power-on state of the multi-plate rib dual area; S4. Power-on heating: According to the preset power-on sequence, a pulse power generator is used to supply a forming operation current of preset power and current to some electrode clamps for a preset time, so that the sheet is locally heated to a preset forming temperature; S5. Stamping and forming: According to the set energizing mode of the plate reinforcement in different areas, the bending punch and the bending die are controlled to cooperate to complete the forming process of the energized area of the sheet metal; S6. Repeat steps 4 and 5 to perform zoned voltage bending on different rib areas. When the plane grid rib wall panel is formed into a preset geometric shape, turn off the pulse current generator, unload the edge pressing electrode assembly and the integrated clamping electrode assembly, and remove the grid rib wall panel after press bending.

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