A titanium alloy integral wall panel electrically assisted multi-point press forming device and method

Abstract

The present invention discloses a self-resistance heating multi-point press progressive forming device and forming method for titanium alloy integral wall panels. The device and forming method combine the electric pulse self-resistance heating characteristics of the plate with the multi-point press progressive forming technology. The forming device includes: an integral wall panel to be formed (ribbed panel), a pressure block, a wire, a rigid tool head, an infrared thermal imager, an adjustable tool head group, a pulse power generator, and a control system. The present invention utilizes the softening and creep properties of titanium alloy materials in a heated state to improve its plasticity, thereby reducing the forming force and improving the formability, reducing the forming process and the rebound of parts; and utilizes the multi-point press progressive forming principle to realize the flexible mold processing process of large-sized workpieces. After the multi-point tool head is connected to the pulse power generator, variable temperature heating can be used according to the deformation requirements of different parts of the integral wall panel, and the web and rib plates can be deformed in different areas, thereby reducing the difficulty of forming difficult-to-deform materials such as titanium alloy integral wall panels with ribs.

Description

Technical Field

[0001] The present invention belongs to the technical field of multi-point progressive and numerically controlled hot progressive composite forming, in particular to an electrically assisted multi-point press forming device and a forming method for complex curved surface parts such as titanium alloy integral wall panels. Background Art

[0002] Titanium and titanium alloy materials not only have outstanding advantages such as high temperature resistance (can be used stably at a temperature of about 600°C), corrosion resistance, high specific strength, fatigue resistance and a wide range of operating temperatures, but also titanium resources are abundant and recyclable. Titanium alloys are mainly used to make aircraft engine compressor parts, followed by rockets, missiles and high-speed aircraft structural parts. Titanium alloys are used in industry to make electrodes for the electrolysis industry, condensers for power stations, heaters for oil refining and seawater desalination, and environmental pollution control devices. Titanium alloys are also known as "space metals", "ocean metals" and "land metals" and are important strategic metal materials.

[0003] However, titanium alloy has a large yield strength ratio at room temperature, requires a large forming force, and is prone to cracking, so the plastic deformation range of titanium and titanium plates is very narrow; moreover, the elastic modulus of titanium alloy at room temperature is also very small, so the springback after sheet metal forming is serious, it is not easy to stick to the mold, and it is difficult to form. In addition, titanium alloy is prone to anisotropy after processing, resulting in reduced sheet performance and dimensional accuracy. At present, the conventional cold deformation or warm deformation method of titanium alloy integral wall panels has high requirements on equipment tonnage, and forming defects such as cracking at the root of the ribs and instability deformation at the upper end of the ribs are prone to occur during the forming process, and the final forming dimensional accuracy is difficult to guarantee. Although titanium alloy wall panels can be formed by the integral milling method or the method of welding reinforcement ribs on the web, the integral milling method is easy to cut off the metal streamlines and cause unreasonable streamlines at key stress positions, and welding reinforcement ribs are easy to introduce residual deformation and welding defects. Therefore, it is urgent to develop new integral forming technologies for titanium alloy grid rib integral wall panels.

[0004] After searching, we found a Chinese invention patent: Multi-point forming method of aluminum alloy aircraft integral wall panel, publication number: CN104646475A, application number: 201510096716.0. This invention discloses a multi-point forming method of aluminum alloy integral wall panel for aircraft. This method places an aluminum alloy integral wall panel with ribs between upper and lower multi-point molds that can quickly reconstruct the mold surface, fills the ribs, and places an elastic pad between the wall panel and the multi-point mold. The aluminum alloy integral wall panel parts with ribs are gradually formed according to a controllable deformation path by using the mold counter-pressure method. This invention can be used for the forming of double-curvature aircraft aluminum alloy integral wall panels with different rib structures, solving the problem of forming large-size, high-rib integral wall panels. However, for materials with high yield strength ratio such as titanium alloy, if this method is used, the forming force required is large and easy to rebound, the forming difficulty is large, and the forming size accuracy will also be low.

[0005] After searching, a Chinese invention patent was found: An electrically assisted press-bending forming process method for a high-temperature titanium alloy grid rib wall panel, publication number: CN 111957777 B, application number: 202010782037.X. The invention discloses an electrically assisted press-bending forming process method for a high-temperature titanium alloy grid rib wall panel, comprising the following steps: milling a high-temperature titanium alloy thick plate into a plane grid rib wall panel; contacting and pressing the two ends of the plane grid rib wall panel respectively by connecting two electrodes of a pulse current generator; the pulse current generator performs self-resistance heating on the plane grid rib wall panel through the electrodes; controlling the downward movement of the press-bending punch to perform a press-bending operation on the plane grid rib wall panel; and waiting for the plane grid rib wall panel to be formed into a designed geometric shape. This invention applies the concept of pulse current assisted forming to the overall forming process of high-temperature titanium alloy grid rib wall panels. It is expected to utilize the material's self-resistance heating effect and electroplasticity effect to improve the formability of the high-temperature titanium alloy grid rib overall wall panel components, and through the coordinated control of the electric-thermal-force field, to achieve integrated and precise control of the shape of the high-temperature titanium alloy grid rib overall wall panel components. However, due to the different thicknesses of the ribs and webs of the wall panel, their deformation resistance is also different, and this method is prone to deformation inconsistency during the forming process.

[0006] Multi-point forming is a flexible processing method for forming three-dimensional curved surfaces of sheet metal. Its basic idea is to use a series of regularly arranged and highly adjustable basic bodies to discretize and replace the traditional integral mold. Due to its high flexibility and other characteristics, the multi-point forming method has advantages that cannot be replaced by traditional molds. The free and rapid construction of the forming surface can be achieved according to the different curved surface shapes of the formed parts. The above-mentioned multi-point forming technology has been successfully applied to the fields of high-speed trains, shipbuilding and aircraft skins, and has achieved commercialization and industrialization. Multi-point forming technology is a major innovation in the traditional production method of three-dimensional curved sheet metal by freely constructing the forming surface by adjusting the height of discrete punches. It has unique advantages for the forming of various complex surfaces. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention proposes an electrically assisted multi-point press forming device and method for titanium alloy integral wall panels, which combines multi-point press progressive forming with the self-resistance heating technology of the plate under electric pulses, and utilizes the softening and creep properties of the titanium alloy material in the heated state to improve its plasticity, thereby reducing the forming force and improving the formability, reducing the springback of parts and simplifying the processing route. The multi-point press forming can fully utilize the flexible advantages of multi-point forming, and can greatly reduce the production and manufacturing costs for large-size, multi-variety, multi-curvature complex curved surface parts in titanium alloy plates; the temperature distribution of the integral wall panel to be formed is dynamically controllable in real time by partition, which can be achieved by forming an energized closed current loop through a specific tool head; the surface forming control system dynamically heats the integral wall panel in real time by partition according to the temperature field required for the deformation of the plate at different times.

[0008] The object of the present invention is achieved through the following technical scheme: a titanium alloy integral wall panel electrically assisted multi-point press forming device comprises:

[0009] A first adjustable tool head group is installed on the upper support plate; a second adjustable tool head group is installed on the lower support plate; after the integral wall panel to be formed is positioned and clamped by the pressure blocks on both sides, it is located between the first adjustable tool head group and the second adjustable tool head group; the two groups of adjustable tool heads can move along their axial directions on the upper and lower support plates respectively; the rigid tool heads of the first adjustable tool head group are connected to the positive pole of the pulse power generator through a wire, and the rigid tool heads of the second adjustable tool head group are connected to the negative pole of the pulse power generator through a wire. When the two groups of tool heads contact the integral wall panel to be formed at the same time, multiple groups of closed self-resistance heating circuits are formed between the tool head groups and the plates.

[0010] Optionally, the two groups of adjustable tool heads each include: N×M groups of rigid tool heads and N×M groups of servo hydraulic cylinders; wherein each rigid tool head is connected to the support plate via a corresponding servo hydraulic cylinder.

[0011] Optionally, the rigid tool head is connected to the pulse power generator via a wire, and the structure of the rigid tool head needs to be a structure that can move with the wire connector.

[0012] Optionally, it also includes: wires, hydraulic pipes, temperature control systems, surface forming control systems and hydraulic control systems;

[0013] The surface forming control system is connected with the temperature control system, hydraulic control system, pulse power generator and infrared thermal imager. The temperature of each local area and the feeding movement of the tool head group in the overall wall panel forming process are controlled by the surface forming control system.

[0014] The output ends of the first hydraulic solenoid valve group and the second hydraulic solenoid valve group are respectively connected to the first adjustable tool head group and the second adjustable tool head group, and the input ends are respectively connected to the control system through the first hydraulic main valve and the second hydraulic main valve hydraulic pressure and hydraulic pipeline.

[0015] Optionally, it also includes: a first infrared thermal imager, a first bracket, a second infrared thermal imager and a second bracket; wherein the first infrared thermal imager and the second infrared thermal imager are connected via the first bracket and the second bracket respectively; the first bracket and the second bracket are respectively arranged at two ends of the upper support plate; the first infrared thermal imager and the second infrared thermal imager are connected to the temperature control system via wires.

[0016] Optionally, it also includes: a pulse power supply control switch; wherein the control switch is arranged on a wire connecting the first adjustable tool head group and the positive pole of the pulse power supply generator.

[0017] Optionally, during the feeding movement of the tool head group, the feed amount difference of adjacent tool heads should be maintained within the range of 5-12mm, so as to avoid severe thinning in local areas while meeting the deformation amount of the plate, and reasonably realize the progressive forming of the integral wall panel by multi-point press.

[0018] The present invention also discloses a titanium alloy integral wall panel electrically assisted multi-point press forming method, comprising:

[0019] The integral wall panel to be formed is positioned and clamped by the edge clamping blocks on both sides;

[0020] A set of adjustable tool head groups are installed on the upper and lower support plates, and each set of adjustable tool head groups includes N×M sets of servo hydraulic cylinders and N×M sets of rigid tool heads;

[0021] The first adjustable tool head group is connected to the positive pole of the pulse power generator through a wire, and the second adjustable tool head group is connected to the negative pole of the pulse power generator through a wire, forming a closed self-resistance heating circuit between the tool head group and the plate.

[0022] The first infrared thermal imager and the second infrared thermal imager are fixed to the two ends of the upper support plate through the first bracket and the second bracket respectively, so as to realize the temperature monitoring between the tool heads and the contact area between the tool heads and the integral wall panel to be formed;

[0023] The surface forming control system inputs the processing temperature parameter value to the temperature control system, sets the temperature that the processing area needs to reach, turns on the pulse power generator, and discharges the pulse power supply. The entire wall panel is divided into multiple local areas by the surface forming control system according to the different deformation amounts of the rib plate and the web plate for variable temperature heating and softening.

[0024] The surface forming control system inputs the feed parameter value to the hydraulic controller, and the hydraulic controller controls the feed movement of each tool head of the tool head group through the hydraulic solenoid valve group and the servo hydraulic cylinder to ensure the reasonable deformation of the plate.

[0025] During the forming process of the integral wall panel by the electric-assisted multi-point press, the feed difference between adjacent tool heads should be kept within the range of 5-12mm, so as to meet the deformation of the plate while avoiding severe thinning in local areas, and reasonably realize the progressive forming of the integral wall panel by the multi-point press.

[0026] As the feeding movement of each pair of tool heads is completed, a formed titanium alloy integral wall panel is produced.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) The present invention discloses an electrically assisted multi-point press forming device and method for titanium alloy integral wall panels. The rigid tool heads of the first adjustable tool head group are connected to the positive pole of a pulse power generator through a wire, and the rigid tool heads of the second adjustable tool head group are connected to the negative pole of a pulse power generator through a wire. Multiple closed self-resistance heating circuits are formed between the tool heads and the integral wall panels to be formed. The high resistance characteristic of titanium alloy is utilized, and currents of different strengths are applied according to the deformation requirements of different parts of the titanium alloy integral wall panels with ribs. The webs and ribs of the integral wall panels are divided into multiple local areas for variable temperature heating, so as to reduce the deformation resistance of the integral wall panels to be formed, increase the degree of deformation that can be achieved by the integral wall panels during forming, and realize the coordinated deformation of the titanium alloy integral wall panels with ribs.

[0029] (2) The present invention discloses a titanium alloy integral wall panel electrically assisted multi-point press forming device and method. The infrared thermal imager monitors the temperature of the local area of ​​the plate in real time and feeds back the temperature data to the temperature controller. The temperature controller dynamically adjusts the pulse power supply discharge state in combination with the temperature processing parameters set from the forming control system for comparative analysis, thereby realizing closed-loop feedback adjustment of the processing temperature control, ensuring the rationality of the integral wall panel temperature value and the heating area distribution. For titanium alloys, a reasonable processing temperature range can significantly improve plasticity, reduce deformation resistance, and prevent severe oxidation.

[0030] (3) The present invention discloses an electrically assisted multi-point press forming device and method for titanium alloy integral wall panels. Under the control of a curved surface forming control system and a hydraulic controller, a first adjustable tool head group and a second adjustable tool head group's rigid tool heads coordinate their feed movements to complete the multi-point press forming of the titanium alloy integral wall panels, thereby enabling flexible mold processing and manufacturing of large-sized complex curved surface parts.

[0031] (4) The present invention discloses an electrically assisted multi-point press forming device and method for titanium alloy integral wall panels, which inputs parameter information of target surface forming into a surface forming control system. The control system synchronously and coordinately controls a temperature controller and a hydraulic controller based on the parameter information and temperature feedback information, thereby keeping the temperature rise and feed rate of each local area of ​​the rib plate and web of the integral wall panel within a suitable process range to ensure the deformation coordination of the integral wall panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an electric-assisted multi-point press forming device for a titanium alloy integral wall panel of the present invention (before the plate is deformed);

[0033] Figure 2 It is a structural schematic diagram of an electric-assisted multi-point press forming device for a titanium alloy integral wall panel of the present invention (after the plate is deformed);

[0034] FIG3 is a schematic diagram of the working process of an electrically assisted multi-point press forming device for titanium alloy integral wall panels according to the present invention;

[0035] FIG4 is a schematic diagram of deformation of a local area of ​​a web during forming of a titanium alloy integral wall panel by an electric-assisted multi-point press according to the present invention;

[0036] FIG5 is a schematic diagram of deformation of a local area of ​​a rib plate during forming of a titanium alloy integral wall panel by an electric-assisted multi-point press according to the present invention;

[0037] In the figure: 1. second adjustable tool head group, 2. first edge holding block, 3. integral wall panel to be formed (ribbed panel), 4. first infrared thermal imager, 5. power control switch, 6. pulse power generator, 7. first bracket, 8. upper support plate, 9. temperature control system, 10. first hydraulic solenoid valve group, 11. hydraulic pipeline, 12. surface forming control system, 13. first hydraulic main valve, 14. second bracket, 15. hydraulic controller, 16. second infrared thermal imager, 17. first adjustable tool head group, 18. second hydraulic main valve, 19. second edge holding block, 20. rigid tool head, 21. servo hydraulic cylinder, 22. lower support plate, 23. second hydraulic solenoid valve group 24. pulse current (the thickness of the arrow represents the current intensity) 25. heating area DETAILED DESCRIPTION

[0038] The following will refer to the attached Figure 1 3 to 4 describe specific embodiments of the present invention in detail. Although specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] The present invention discloses a titanium alloy integral wall panel electrically assisted multi-point press forming device, which combines electric pulse assisted processing technology with multi-point press flexible forming technology. The forming object involved is a large-size titanium alloy integral wall panel structure with ribbed plates. The titanium alloy material used in the structure has large room temperature deformation resistance, poor plasticity, and is difficult to deform. The integral wall panel with ribs is difficult to deform as a whole, and the deformation of the ribs and webs is very likely to be uncoordinated when deformed under pressure.

[0043] Reference Figure 1 , is a structural schematic diagram of an electrically assisted multi-point press forming device for a titanium alloy integral wall panel in the present invention, wherein the electrically assisted multi-point press forming device comprises: a second adjustable tool head group (1), a first edge pressing block (2), an integral wall panel to be formed (3), a pulse power generator (6), an upper support plate (8), a first hydraulic solenoid valve group (10), a first hydraulic main valve (13), a first adjustable tool head group (17), a second hydraulic main valve (18), a second edge pressing block (19), a lower support plate (22) and a second hydraulic solenoid valve group (23).

[0044] The integral wall panel (3) to be formed is positioned and clamped by a first edge clamping block (2) and a second edge clamping block (19); a first adjustable tool head group (17) is installed on an upper support plate (8); a second adjustable tool head group (1) is installed on a lower support plate (22); the integral wall panel (3) to be formed is positioned and clamped by the edge clamping blocks on both sides and is located between the first adjustable tool head group (17) and the second adjustable tool head group (1); the two groups of adjustable tool heads can move along the axis direction of their tool heads on the two support plates respectively; the rigid tool head (20) of the first adjustable tool head group (17) is connected to a pulse generator through a wire. The positive electrode of the power generator (6) and the rigid tool head (20) of the second adjustable tool head group (1) are connected to the negative electrode of the pulse power generator (6) through a wire. When the two groups of adjustable tool heads contact the integral wall panel to be formed at the same time, multiple groups of closed self-resistance heating circuits are formed, and the integral wall panel is heated at different current intensities in multiple local areas. Among them, the local self-resistance heating circuit refers to: passing a large current through the titanium alloy material, using the high resistance property of the titanium alloy to generate a large amount of Joule heat in a short time, so that the temperature of multiple local areas of the integral wall panel to be formed is rapidly increased, thereby achieving the purpose of hot forming.

[0045] In the present invention, as shown in FIG3 , the first adjustable tool head group (17) and the second adjustable tool head group (1) both include: N×M groups of rigid tool heads (20) and N×M groups of servo hydraulic cylinders (21). The servo hydraulic cylinder is fixedly connected to the support plate, and the feeding power of the rigid tool head is provided by the servo hydraulic cylinder. Preferably, the number N×M of rigid tool heads and servo hydraulic cylinders can be set according to the shape and size of the integral wall panel to be formed. Generally, for integral wall panels with relatively large sizes, the value of N×M is larger; for integral wall panels with ribbed plates with more complex curved surfaces to be formed, the distance between each adjacent pair of tool heads is smaller, and the value of N×M is also larger, so as to improve the surface forming accuracy of the integral wall panel. Furthermore, since the rigid tool head (20) is connected to the pulse power generator through a wire, the structure of the rigid tool head needs to adopt a structure that can move with the wire connector.

[0046] In the present invention, the electrical parameters of the pulse current are one of the key factors in the forming quality of the ribbed titanium alloy integral wall panel. Since the contact resistance between the rigid tool head and the integral wall panel to be formed is very large, when the electric pulse amplitude is too large and the duty cycle is too large, the temperature of the local area will be extremely high after power-on. The excessively high temperature will cause the integral wall panel to be formed to soften severely, and the contact load between the rigid tool head and the integral wall panel is very large, which will damage the surface quality of the integral wall panel. In severe cases, it may even cause the wall panel to be formed to crack prematurely, reducing the forming limit of the integral wall panel to be formed. When the electric pulse amplitude is too large and the duty cycle is too small, the temperature of the local area will be insufficient after power-on. For areas with large deformation, the deformation resistance is large, the forming effect is poor, and the springback is serious.

[0047] The frequency of the pulse power generator used is 800 Hz, the positive pulse time is 80 μs, the duty cycle is 5%, and the pulse peak current value and current density are set according to the specific thickness of the titanium alloy integral wall panel.

[0048] In the present invention, Figure 1 The titanium alloy integral wall panel electrically assisted multi-point press forming device further comprises: a first infrared thermal imager (4), a first bracket (7), a second infrared thermal imager (16) and a second bracket (14). The first bracket (7) and the second bracket (14) are respectively arranged at two ends of the upper support plate (8); the first infrared thermal imager (4) and the second infrared thermal imager (16) are respectively connected through the first bracket (7) and the second bracket (14); the first infrared thermal imager (4) and the second infrared thermal imager (16) are connected to the temperature control system (9) through a wire.

[0049] The first infrared thermal imager (4) and the second infrared thermal imager (16) can monitor the temperature state of each area of ​​the whole wall panel in real time, and feed back the temperature data to the temperature controller. The temperature controller compares and analyzes the temperature processing parameters set by the forming control system, dynamically adjusts the discharge state of the pulse power supply, and then realizes the closed-loop feedback adjustment of the processing temperature control, ensuring the rationality of the temperature value of the whole wall panel and the distribution of the heating area. For titanium alloy, the reasonable processing temperature range is the temperature range that can significantly improve plasticity, reduce deformation resistance and not cause serious oxidation.

[0050] In the present invention, Figure 1 The titanium alloy integral wall panel electrically assisted multi-point press forming device further comprises a hydraulic system: a hydraulic controller (15), a first hydraulic solenoid valve group (10), a second hydraulic solenoid valve group (23), a hydraulic pipeline (11), a first hydraulic main valve (13) and a second hydraulic main valve (18). The feed movement of the tool head group is controlled by the entire hydraulic system. The hydraulic controller (15) receives the motion parameter signal from the forming control system, controls the output of the internal hydraulic pump and the opening and closing state of the hydraulic solenoid valve group, and realizes the feed movement of the tool head group with the help of hydraulic oil and hydraulic pipelines to complete the deformation processing process of the integral wall panel.

[0051] In the present invention, Figure 1 The titanium alloy integral wall panel electrically assisted multi-point press forming device further comprises: a control switch (5). The control switch is arranged on a wire connecting the first adjustable tool head group and the positive electrode of the pulse power generator.

[0052] In the present invention, the curved surface forming control system serves as the overall control system. On the one hand, it controls the temperature of the local area of ​​the integral wall panel to be formed, and divides the web and rib plate into multiple local areas for variable temperature heating according to different deformation requirements of the integral wall panel; on the other hand, it controls the feed amount of the tool head group to achieve deformation coordination of the integral wall panel.

[0053] Referring to Figure 3, the working process of the titanium alloy integral wall panel electric-assisted multi-point press forming device can be generally divided into 6 steps, namely: starting the machine to detect the equipment, positioning and clamping the metal wall panel to be formed, inputting the processing parameter data, curved surface forming, the plate gradually forming the target curved surface, unloading the formed integral wall panel and removing the edge material. Among them, the curved surface forming process is the most critical link, which includes: the pulse power discharge causes the local area of ​​the integral wall panel to heat up, the tool head feed movement, the temperature feedback and the real-time adjustment of the local area temperature and the tool head feed.

[0054] Example 2

[0055] The present invention also discloses a titanium alloy integral wall panel electrically assisted multi-point press forming method, comprising: a first adjustable tool head group is installed on an upper support plate; a second adjustable tool head group is installed on a lower support plate; after the integral wall panel to be formed is positioned and clamped by the edge clamping blocks on both sides, it is located between the first adjustable tool head group and the second adjustable tool head group; each group of adjustable tool head groups includes N×M groups of servo hydraulic cylinders and N×M groups of rigid tool heads; the adjustable tool heads can move along their axial directions on the two support plates respectively; the first adjustable tool head group is connected to the positive pole of the pulse power generator through a wire, and the second adjustable tool head group is connected to the negative pole of the pulse power generator through a wire. When the two groups of tool heads contact the plate to be formed at the same time, multiple groups of closed self-resistance heating circuits are formed between the tool head group and the integral wall panel to be formed; the first adjustable tool head group is connected to the positive pole of the pulse power generator through a wire, and the second adjustable tool head group is connected to the negative pole of the pulse power generator through a wire. When the two groups of tool heads contact the plate to be formed at the same time, multiple groups of closed self-resistance heating circuits are formed between the tool head group and the integral wall panel to be formed; the first The infrared thermal imager and the second infrared thermal imager are respectively fixed to the two ends of the connecting rod through the first bracket and the second bracket to realize temperature monitoring between each tool head and the contact area between each tool head and the integral wall panel to be formed; the temperature to be reached in the processing area is set through the temperature control system, the pulse power generator is turned on, the pulse power is discharged, and the local area of ​​the integral wall panel is heated and softened; the feeding movement of the tool head group is controlled by the entire hydraulic system, and the hydraulic controller receives the process parameter signal from the surface forming control system, controls the output of the internal hydraulic pump and the connection state of the hydraulic solenoid valve group, and realizes the feeding movement of the tool head group with the help of hydraulic oil and liquid pipelines, realizing the deformation processing process of the integral wall panel, and with the completion of the feeding movement of each tool head, the titanium alloy integral wall panel of the target shape is produced.

[0056] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A titanium alloy integral wall panel electrically assisted multi-point press forming device, characterized in that: include: A second adjustable tool head group (1), a first edge clamping block (2), an integral wall panel to be formed with a ribbed plate (3), a pulse power generator (6), an upper support plate (8), a first adjustable tool head group (17), a second edge clamping block (19), and a lower support plate (22); the integral wall panel to be formed (3) is clamped by the first edge clamping block (2) and the second edge clamping block (19); the first adjustable tool head group (17) is installed on the upper support plate (8), and the second adjustable tool head group (1) is installed on the lower support plate (22); the movement of the first adjustable tool head group (17) is realized by the first hydraulic solenoid valve group (10) and the hydraulic controller (15), and the movement of the second adjustable tool head group (1) is realized by the second hydraulic solenoid valve group (23 ) and a hydraulic controller (15); the rigid tool head (20) of the first adjustable tool head group (17) is connected to the positive electrode of the pulse power generator (6) through a wire, and the rigid tool head (20) of the second adjustable tool head group (1) is connected to the negative electrode of the pulse power generator (6) through a wire. When the two groups of tool heads contact the sheet to be formed at the same time, multiple groups of closed self-resistance heating circuits are formed, and the sheet is heated and creep-softened. The temperature rise of each local area is determined by the discharge intensity of the pulse power generator (6) connected to the tool head. According to the different requirements of the deformation of the rib plate and the web plate, the pulse power supply discharges with different intensities to the tool heads at different positions, and the discharge intensity is controlled by the curved surface forming control system (12); The zoned heating and deformation of different parts of the integral wall panel (3) to be formed includes three parts: zoned heating and deformation between the rib plate and the web plate, zoned heating and deformation of the web plates at different positions due to different deformation requirements, and zoned heating and deformation of the rib plates at different positions due to different deformation requirements; the heating temperature and feed rate of the local area during the zoned deformation process are jointly determined by the parameters pre-input into the curved surface forming control system (12) and the feedback information from the infrared thermal imagers on both sides, thereby improving the coordination of the forming deformation of the integral wall panel; The invention comprises: a first infrared thermal imager (4), a first bracket (7), a second infrared thermal imager (16) and a second bracket (14); wherein the first bracket (7) and the second bracket (14) are respectively arranged at two ends of an upper support plate (8); the first infrared thermal imager (4) and the second infrared thermal imager (16) are respectively connected via the first bracket (7) and the second bracket (14); the first infrared thermal imager (4) and the second infrared thermal imager (16) are connected to a temperature control system (9) via a wire to monitor the temperature conditions of various areas of the plate in real time; After multiple local areas of the integral wall panel (3) to be formed are heated to a certain degree by discharge of multiple pairs of tool heads, the first infrared thermal imager (4) and the second infrared thermal imager (16) on both sides transmit the monitored temperature data to the temperature control system (9) and feed it back to the curved surface forming control system (12), and the curved surface forming control system transmits the information to the hydraulic controller (15) to dynamically adjust the tool head feeding movement in real time, so as to realize variable temperature multi-point press forming of different areas of the integral wall panel (3) to be formed; It also includes: a curved surface forming control system (12); the control system is the overall control system of the entire device, which, on the one hand, adjusts the discharge intensity of the pulse power generator (6) to adjust the temperature rise of each local area of ​​the plate; on the other hand, it transmits the forming process parameters to the hydraulic controller (15) to control the feeding movement of the rigid tool head; the control system can also receive temperature information monitored by the first infrared thermal imager (4) and the second infrared thermal imager (16) on both sides, and adjusts the discharge intensity of the pulse power generator (6) and the corresponding rigid tool head (20) movement in real time according to the feedback temperature information, so as to avoid burning and cracking of the plate caused by excessive temperature rise in the local area and excessive feeding of the tool head.

2. The titanium alloy integral wall panel electrically assisted multi-point press forming device according to claim 1, characterized in that: The first adjustable tool head group (17) and the second adjustable tool head group (1) are both composed of N×M groups of rigid tool heads (20) and N×M groups of servo hydraulic cylinders (21); wherein the servo hydraulic cylinders are connected and fixed to the support plate, and the feeding motion power of the rigid tool heads is provided by the servo hydraulic cylinders.

3. According to the titanium alloy integral wall panel electrically assisted multi-point press forming device described in claim 1, the rigid tool head (20) is connected to the pulse power generator (6) through a wire, and its structure needs to adopt a structure that can move with the wire connector.

4. According to the electrically assisted multi-point press forming device for titanium alloy integral wall panels as described in claim 1, during the electrically assisted multi-point press forming process of the integral wall panels, the feed amount difference between adjacent tool heads should be maintained within the range of 5-12 mm, while satisfying the deformation amount of the plate and avoiding severe thinning in local areas, thereby reasonably realizing the progressive forming of the integral wall panels by the multi-point press.

5. The titanium alloy integral wall panel electrically assisted multi-point press forming device according to claim 1, characterized in that: Also includes: A hydraulic controller (15), a first hydraulic solenoid valve group (10), a second hydraulic solenoid valve group (23), a hydraulic pipeline (11), a first hydraulic main valve (13) and a second hydraulic main valve (18); wherein the output ends of the first hydraulic solenoid valve group (10) and the second hydraulic solenoid valve group (23) are respectively connected to the N×M groups of servo hydraulic cylinders (21) on the upper support plate (8) and the lower support plate (22), and the input ends are respectively connected to the first hydraulic main valve (13) and the second hydraulic main valve (18) through the hydraulic pipeline (11); the hydraulic solenoid valve group adjusts the feeding movement of each pair of tool heads under the control of the hydraulic controller (15) to complete the multi-point press forming of the plate.

6. According to claim 1, a titanium alloy integral wall panel electrically assisted multi-point press forming device involves a large-size titanium alloy integral wall panel structure with ribbed plates; the titanium alloy material used in the structure has high room temperature deformation resistance, poor plasticity, and is difficult to deform; the ribbed integral wall panel is difficult to deform as a whole, and the deformation of the rib plate and the web is very likely to be uncoordinated when deformed under pressure.

7. According to the electrically assisted multi-point press forming device for titanium alloy integral wall panels as described in claim 2, the temperature distribution of the integral wall panel (3) to be formed is dynamically and real-time controllable in different zones, which can be achieved by forming an energized closed current loop through a specific tool head; the curved surface forming control system (12) dynamically and real-time heats the integral wall panel in different zones according to the temperature field required for the deformation of the plate at different times.

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