Integral labor-saving forming device and method for carrier rocket box bottom

Abstract

The invention relates to the field of plastic forming of large metal thin-wall curved surface components in the aerospace field, and provides a carrier rocket box bottom overall labor-saving forming device and method, and the device comprises a deep drawing male die, a deep drawing pressing edge, a partition thick shell, a female die and a control system; a plate blank is arranged on the female die, the edge of the plate blank is pressed by the deep drawing pressing edge, a deep drawing liquid chamber is formed between the plate blank and the female die, the partition thick shell is arranged in the female die and divides the deep drawing liquid chamber into a low-pressure liquid chamber and a high-pressure liquid chamber, and the deep drawing male die is arranged above the female die. According to the invention, the drawing liquid chamber is partitioned at low pressure and high pressure by adding the partitioned thick shell, so that labor-saving liquid-filling drawing regulation and control are realized, and higher liquid chamber counter-force loading can be realized under the same drawing force condition, thereby improving the effect of liquid-filling drawing reverse bulging to inhibit wrinkling, and avoiding the problem of low equipment tonnage utilization rate at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic forming of large metal thin-walled curved surface components in the field of aerospace, in particular to a whole labor-saving forming device and method for a box bottom of a launch vehicle. BACKGROUND

[0002] The storage tank of a launch vehicle is the key and core of the missile body structure, and the box bottom is the main part of the storage tank, which has the largest forming difficulty, the longest forming cycle, the highest precision requirement, and the development of advanced manufacturing technology and equipment for the box bottom is the core of the missile body structure manufacturing technology. In the field of aerospace manufacturing, the forming methods of the box bottom include traditional block manufacturing and welding method, whole liquid filling deep drawing method, whole spinning method, whole additive manufacturing method, etc. Among them, the liquid filling deep drawing method has the advantages of high forming precision, high mechanical property and low manufacturing cost compared with the spinning and whole additive manufacturing methods, therefore, the whole liquid filling deep drawing method of the box bottom is the main development direction of the whole manufacturing of the box bottom.

[0003] The liquid filling deep drawing method adopts the method of applying a normal force on the back of the plate to strengthen the constraint on the suspension area of the plate blank (7), so as to change the stress state of the suspension area and achieve the purpose of controlling the wrinkling defect. Due to the introduction of the normal stress of the plate, most of the work in the drawing process is used to overcome the counterforce of the hydraulic chamber, so that the equipment tonnage is super large, thereby causing high energy consumption and high equipment tonnage of the liquid filling deep drawing process, therefore, a method for reducing the liquid filling deep drawing is urgently needed to meet the size precision and performance requirements of the whole bottom. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a whole labor-saving forming device and method for a box bottom of a launch vehicle.

[0005] According to the whole labor-saving forming device for a box bottom of a launch vehicle provided by the present application, the deep drawing punch, the deep drawing blank holder, the partitioned thick shell, the die and the control system are included; The plate blank is arranged on the die and the edge part is pressed by the deep drawing blank holder, a deep drawing liquid chamber is formed between the plate blank and the die, the partitioned thick shell is arranged in the die and divides the deep drawing liquid chamber into a low-pressure liquid chamber and a high-pressure liquid chamber, and the deep drawing punch is arranged above the die; At the beginning of the machining and forming, the partitioned thick shell is in an initial state and there is a gap between the plate blank and the partitioned thick shell, the low-pressure liquid chamber and the high-pressure liquid chamber are both in a pressure relief state and are in communication with each other, the deep drawing punch is driven to move towards the die, thereby being capable of carrying out top pressure forming processing on the plate blank until the plate blank contacts the top of the partitioned thick shell, so that the low-pressure liquid chamber and the high-pressure liquid chamber are not in communication, then the deep drawing punch and the partitioned thick shell move synchronously, the pressure in the high-pressure liquid chamber rises and is higher than the pressure in the low-pressure liquid chamber until the plate blank completes the pressing forming; The control system is connected with a drawing punch, a drawing binder, and a partitioned thick shell control respectively.

[0006] According to the application, a whole labor-saving forming method for a launch vehicle box bottom is provided, which comprises the following steps: S1, slab pre-positioning: placing a slab on a concave die, a drawing binder compresses the edge of the slab, and a drawing punch contacts the slab; S2, drawing liquid chamber liquid filling: loading pressure on the drawing liquid chamber; S3, low-pressure liquid filling drawing: keeping the edge compression force and the drawing liquid chamber pressure unchanged, the drawing punch starts to move until the slope of the tangent line between the drawing punch and the slab is 1; S4, reverse pressure reduction: when the slope of the tangent line between the drawing punch and the slab is equal to 1, the pressure in the drawing liquid chamber is unloaded, the drawing liquid chamber is kept open, the drawing punch continues to move, the partitioned thick shell reversely moves to contact the slab, and back pressure is applied; S5, high-pressure liquid chamber pressure increase: the high-pressure liquid chamber pressure is increased, and the position of the drawing punch is kept unchanged; S6, high-pressure liquid filling drawing: the drawing punch moves at a constant speed, the partitioned thick shell moves synchronously and in the same direction on the back, the contact pressure between the partitioned thick shell and the slab is controlled through the back pressure, and the high-pressure liquid chamber pressure is stably and reliably servo-adjusted; S7, pressure relief and part taking: after the drawing is moved to a position, the position of the drawing punch is kept unchanged, the drawing liquid chamber is unloaded to no pressure, the back pressure of the partitioned thick shell is unloaded to no pressure, and then the drawing punch is reversely returned to zero.

[0007] Preferably, the partitioned thick shell is located at an initial position, so that a gap exists between the partitioned thick shell and the slab.

[0008] Preferably, the bottom of the partitioned thick shell is provided with a thick shell liquid chamber, and the top is provided with a sealing structure, the action of the partitioned thick shell is driven by the pressure of the thick shell liquid chamber, and the pressure in the thick shell liquid chamber can drive the partitioned thick shell to act.

[0009] Preferably, the position where the slope of the tangent line between the drawing punch and the slab is 1 is used as the demarcation point between the low-pressure liquid chamber and the high-pressure liquid chamber.

[0010] Preferably, the drawing punch, the drawing binder, and the partitioned thick shell are all driven by fluid, and the fluid is liquid, gas, or semi-solid medium.

[0011] Preferably, the drawing punch comprises a punch pressure loading tool, the punch pressure loading tool is provided with a punch loading liquid chamber, and the action of the drawing punch is controlled by the pressure of the punch loading liquid chamber.

[0012] Preferably, the sub-area thick shell is set to a fixed back pressure when it moves synchronously with the drawing punch, ensuring that the sub-area thick shell and the drawing punch run synchronously while having a constant normal force with the slab.

[0013] Preferably, the center area low-pressure liquid chamber has a pressure of zero when the high-pressure liquid chamber is independently loaded.

[0014] Preferably, the box bottom material is aluminum alloy or stainless steel, and the box bottom thickness ranges from 2 to 15 mm, and the diameter of the box bottom is 2000-10000 mm.

[0015] Compared with the prior art, the present application can improve the liquid chamber pressure and reduce the tonnage of the drawing for large-diameter box bottom liquid-filled deep drawing forming, thereby realizing precise and energy-saving forming of the rocket box bottom, and has the following beneficial effects: 1. The present application realizes labor-saving liquid-filled deep drawing control by dividing the drawing liquid chamber into low-pressure and high-pressure areas through the sub-area thick shell, can realize higher loading of the liquid chamber counterforce under the same drawing force, thereby improving the effect of suppressing wrinkling by the counter-expansion of the liquid-filled deep drawing (for example, for the liquid-filled deep drawing forming of a diameter 3350 box bottom, the drawing equipment is 10000 tons, the maximum liquid chamber pressure of the traditional liquid-filled deep drawing is 10 MPa, the liquid chamber pressure is increased to 20 MPa by using the labor-saving liquid-filled deep drawing device, which is nearly 1 times), and can meet the forming requirements of thinner stainless steel box bottoms; under the same liquid chamber pressure, the liquid chamber pressure counterforce can be significantly reduced, thereby reducing the requirement for equipment tonnage (for example, for the liquid-filled deep drawing forming of a diameter 3350 box bottom, when the liquid chamber pressure is 10 MPa, the tonnage of the traditional liquid-filled deep drawing equipment needs to be more than 10000 tons, and the tonnage of the equipment using the labor-saving liquid-filled deep drawing device is less than 6500 tons, which is reduced by more than 30%).

[0016] 2. The present application realizes labor-saving control in stages by using the drawing liquid chamber, the drawing punch, the back pressure of the sub-area thick shell, and the coupled servo control of the blank holder force, realizes real-time adjustment of the drawing window with the goal of controlling wrinkling by adjusting the variation curves of the liquid chamber pressure, the back pressure of the sub-area thick shell, and the blank holder force with the drawing punch, and avoids the waste of equipment caused by the low utilization rate of equipment tonnage due to constant blank holder force and constant liquid chamber pressure in the traditional liquid-filled deep drawing process (for example, for the traditional liquid-filled deep drawing of an ellipsoidal box bottom with a diameter of 3350 mm and a module of 1.6, the blank holder force and the liquid chamber pressure loading curve are constant values, and the actual utilization rate of the equipment tonnage for part deformation in the early stage of drawing is only 20%, and by using the labor-saving forming device, variable blank holder force and variable liquid chamber pressure loading can be realized, so that the equipment utilization rate in the early stage is increased to more than 80%). BRIEF DESCRIPTION OF DRAWINGS

[0017] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 The diagram shows a labor-saving forming device for the bottom of a launch vehicle propellant tank. The left and right sides of the diagram show cross-sectional views of the drawing punch moving downwards at different distances.

[0018] The diagram shows: Deep drawing punch 1; Punch loading chamber 11; Deep drawing and blanking 2; Deep drawing liquid chamber 3; Low-pressure liquid chamber 31; High-pressure liquid chamber 32; Partitioned Thick Shell 4; Thick-shell liquid chamber 41; Die 5; Control system 6; 7. Slab Detailed Implementation

[0019] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0020] Example 1: This invention provides a labor-saving integral forming device for the bottom of a launch vehicle container, such as... Figure 1 As shown, the system includes a drawing punch 1, a drawing blank holder 2, a partitioned thick shell 4, a die 5, and a control system 6. The slab 7 is positioned on the die 5 and its edges are pressed by the drawing blank holder 2. A drawing liquid chamber 3 is formed between the slab 7 and the die 5. The partitioned thick shell 4 is positioned in the die 5 and divides the drawing liquid chamber 3 into a low-pressure liquid chamber 31 and a high-pressure liquid chamber 32. The drawing punch 1 is positioned above the die 5. At the start of the forming process, the partitioned thick shell 4 is in its initial state and there is a gap between it and the slab 7. The low-pressure liquid chamber 31 and the high-pressure liquid chamber 32 are both in a depressurized state and are interconnected. This drives the drawing punch 1 to move toward the die 5, thereby enabling the slab 7 to be pressed and formed until the top of the slab 7 contacts the partitioned thick shell 4. At this time, the drawing punch 1 and the partitioned thick shell 4 move synchronously. The pressure in the high-pressure liquid chamber 32 increases and becomes higher than the pressure in the low-pressure liquid chamber 31 until the slab 7 is pressed and formed. The control system 6 is connected to the drawing punch 1, the drawing blank holder 2, and the partitioned thick shell 4 respectively. The control system 6 can control the actions of the drawing punch 1, the drawing blank holder 2, and the partitioned thick shell 4 respectively.

[0021] The present invention also provides a method for integral, labor-saving forming of the bottom of a launch vehicle container, comprising the following steps: S1, slab 7 pre-positioning: The blank 7 is placed on the concave die 5, the draw-ironing 2 applies stable pressure to the edge of the blank 7, and the draw punch 1 is in contact with the blank 7. The zoned thick shell 4 is in the initial position, and a certain gap is ensured between the zoned thick shell 4 and the blank 7.

[0022] S2, the draw liquid chamber 3 is filled with liquid: The pressure of the draw liquid chamber 3 is loaded to p1, and the loading pressure is controlled by a hydraulic servo valve, and the pressure control precision is 0.1 MPa.

[0023] S3, low-pressure liquid-filling drawing: The draw punch 1 starts to move until the drawing diameter of the blank 7 is x, at which time the slope of the tangent line between the draw punch 1 and the blank 7 is 1.

[0024] S4, reverse pressure reduction: When the slope of the tangent line between the draw punch 1 and the blank 7 is equal to 1, the pressure in the draw liquid chamber 3 is unloaded, and the draw liquid chamber 3 is always kept open. At this time, the draw punch 1 continues to move, the zoned thick shell 4 moves reversely and contacts the blank 7, and a certain back pressure is applied to ensure that the normal force between the zoned thick shell 4 and the blank 7 is greater than 1.5 MPa.

[0025] S5, high-pressure liquid chamber 32 pressure increase: The pressure of the high-pressure liquid chamber 32 is increased to P2, and the position of the draw punch 1 is kept unchanged.

[0026] S6, high-pressure liquid-filling drawing: The draw punch 1 moves at a constant speed, and the zoned thick shell 4 moves synchronously and in the same direction on the back, and the contact pressure between the thick shell and the blank 7 is controlled by the back pressure, so as to ensure that the pressure of the high-pressure liquid chamber 32 is stable and reliable and can be adjusted by servo.

[0027] S7, pressure relief and part taking: After the drawing is displaced to the position, the position of the draw punch 1 is kept unchanged, the draw liquid chamber 3 is unloaded to no pressure, the back pressure of the zoned thick shell 4 is unloaded to no pressure, and then the draw punch 1 is returned to zero.

[0028] Specifically, the draw liquid chamber 3 and the back pressure of the zoned thick shell 4 adopt a pressure control mode, and the control of the counterforce is realized by the control system 6. The draw punch 1 adopts a displacement control mode, and the moving direction and displacement of the punch are controlled by adjusting the pressure difference between the draw punch 1 pressure and the back pressure.

[0029] As shown in Figure 1 The bottom of the zoned thick shell 4 is provided with a thick shell liquid chamber 41, and the top is provided with a sealing structure. The action of the zoned thick shell 4 is driven by the pressure control of the thick shell liquid chamber 41. Controlling the pressure inside the thick shell liquid chamber 41 can drive the zoned thick shell 4 to act and realize the zoning of the draw liquid chamber 3.

[0030] Furthermore, hydraulic loading causes the boundary between the two sections of the drawing chamber 3, i.e., the interface of the partitioned thick shell 4, to be determined by a tangent slope of 1. When the slope is greater than 1, the rate of change of the area of ​​the high-pressure chamber 32 with the increase of the drawing displacement increases, which leads to wrinkling defects easily occurring in the circumferential direction of the slab 7. It is necessary to increase the chamber pressure to control the occurrence of wrinkling. Therefore, after drawing to the die diameter of the slab 7 is x, independent pressurization of the high-pressure chamber 32 can significantly reduce the drawing reaction force. This invention can significantly improve the effect of suppressing wrinkling during liquid-filled drawing. By adopting the independent partitioned chamber pressure control method, the chamber pressure can be increased while ensuring that the drawing punch 1 remains stationary, thereby controlling wrinkling defects. It can also significantly reduce the tonnage of the equipment. By adopting the independent partitioned chamber pressure control, the pressure in the central area is reduced to zero, and the drawing reaction force is reduced ( +1). For spherical shells, the force can be reduced by 0.5 times; for ellipsoids with a modulus of 1.6, it can be reduced by 0.28 times. That is, the larger the modulus of the ellipsoidal shell, the more significant the reduction in drawing reaction force. It can realize liquid-filled deep drawing forming of ultra-thin box bottoms such as stainless steel, solving the problem of ultra-high liquid chamber pressure requirements for integral forming of ultra-thin stainless steel box bottoms. This invention can significantly increase the liquid-filled deep drawing process window and improve the stability of the liquid-filled deep drawing process for box bottoms.

[0031] It should be noted that the high-pressure fluid applicable to this invention can be liquid water, emulsion, hydraulic oil, gas, and semi-solid media, etc. This invention is not only applicable to ellipsoidal shell bottoms, spherical shell bottoms, conical shell bottoms, etc., but also to different configurations. The separation surface of the partitioned thick shell 4 can be selected according to the curvature variation of the surface as the dividing line.

[0032] The drawing blank holder 2 is equipped with a blank holder pressure loading fixture, which can apply pressure to the drawing blank holder 2 to press the edge of the slab 7 onto the die 5.

[0033] Specifically, the drawing punch 1 includes a punch pressure loading fixture, which is equipped with a punch loading liquid chamber 11. The movement of the drawing punch 1 is controlled by the pressure of the punch loading liquid chamber 11. The drawing punch 1 is controlled by a displacement control method, and the drawing position is moved by adjusting the pressure difference between the punch loading liquid chamber 11 and the thick shell liquid chamber 41.

[0034] This invention establishes a sealed area enclosed by the drawing die 5, the slab 7, and the partitioned thick shell 4 by setting an annular thick shell in the opposite direction of the drawing process to isolate the pressure in the drawing liquid chamber 3. This allows for independent control of the liquid chamber pressure in different areas during the drawing process. Specifically, when the radius of the slab 7 against the drawing punch 1 is less than x (defined below), the liquid chamber pressure is low-pressure loading, ranging from 1 to 5 MPa. When the radius of the slab 7 against the punch is greater than x, the liquid chamber pressure is high-pressure loading, ranging from 10 to 20 MPa.

[0035] The drawing punch 1 can move along the drawing direction, when the radius of the blank 7 close to the drawing punch 1 is equal to x, the partitioned thick shell 4 is closely attached to the blank 7, so that the blank 7, the partitioned thick shell 4 and the concave die 5 form independent sealed spaces, i.e. the low-pressure liquid chamber 31 and the high-pressure liquid chamber 32, and when the drawing punch 1 and the partitioned thick shell 4 move synchronously, the pressure of the sealed space is servo-controllable.

[0036] When the partitioned thick shell 4 and the drawing punch 1 move synchronously, the drawing punch 1 adopts displacement control, and the partitioned thick shell 4 is set to a fixed back pressure, so as to ensure that the partitioned thick shell 4 and the drawing punch 1 move synchronously while having a constant normal force with the blank 7, thereby ensuring the sealing property of the high-pressure liquid chamber 32.

[0037] The position of the partitioned thick shell 4 along the radial direction is determined according to the tangent slope of the section generatrix of the box bottom configuration, and the position with a slope of 1 is set as the demarcation point, i.e. the position at which the partitioned thick shell 4 starts to contact the blank 7 to form an independent high-pressure sealed area. For example, when the box bottom configuration is a spherical bottom, the coordinate of the demarcation point is wherein r is the radius of the box bottom. When the box bottom configuration is an ellipsoid, the major axis is a and the ellipsoid modulus is m, the coordinate of the demarcation point is .

[0038] The back pressure of the partitioned thick shell 4 is independently controlled, and the pressures of the low-pressure liquid chamber 31 and the high-pressure liquid chamber 32 are independently controlled, The drawing process is that when the radius of the blank 7 close to the drawing punch 1 is less than x, the entire drawing liquid chamber 3 injects all the high-pressure liquid, with the increase of the drawing displacement, the contact area between the blank 7 and the drawing punch 1 increases, when the radius close to the drawing punch 1 is greater than x, the partitioned thick shell 4 contacts the blank 7, and the high-pressure liquid chamber 32 starts to form an independent sealed space. When the high-pressure liquid chamber 32 is independently loaded, the pressure of the central area low-pressure liquid chamber 31 is zero, thereby reducing the hydraulic projection area on the back of the drawing punch 1 and reducing the forming tonnage of the equipment.

[0039] In order to further reduce the liquid chamber pressure, a plurality of partitioned thick shell 4 units can be added to further reduce the area of the high-pressure liquid chamber 32.

[0040] The area of the high-pressure liquid chamber 32 in the deep drawing process becomes smaller and smaller with the increase of the deep drawing displacement, that is, the tangent point of the blank 7 and the deep drawing punch 1 moves upward along the edge of the deep drawing punch 1, and at the same time, the liquid chamber pressure required for the high-pressure liquid chamber 32 to inhibit wrinkling becomes larger and larger, that is, the larger the part sticking to the die, the larger the liquid chamber pressure required for inhibiting wrinkling, but the area that has been stuck to the die has completed deformation and no longer needs the action of the liquid chamber pressure, therefore, the larger deep drawing force required in the later stage of deep drawing to balance the back liquid chamber reaction force of the blank 7 causes the waste of equipment tonnage, the independent control of the liquid chamber pressure in different zones can realize the accurate and effective control of the liquid chamber pressure and reduce the equipment tonnage. At the same time, according to the change of the high-pressure liquid chamber 32 in the bottom-up deep drawing process with the deep drawing displacement and the change of the reaction force of the liquid chamber pressure in the deep drawing process, the increase of the deep drawing force in the later stage can be greatly reduced, thereby realizing the labor-saving control of the deep drawing force in the whole deep drawing process.

[0041] The box bottom integral liquid deep drawing forming method of the present application is aimed at the configuration of the box bottom, including but not limited to a spherical shell box bottom, an ellipsoidal shell box bottom, a conical shell box bottom, a rotary quadratic surface bottom, etc. The box bottom integral liquid deep drawing forming method is aimed at the material of the box bottom, which is aluminum alloy or stainless steel, the thickness range of the box bottom is 2-15 mm, the diameter of the box bottom is 2000-10000 mm, etc. The box bottom integral liquid deep drawing forming method is aimed at the liquid, which can be water medium, oil medium, water-oil mixed medium, emulsion, semi-solid medium, gas medium, etc.

[0042] Embodiment 2: This embodiment is a preferred example of embodiment 1, in this embodiment, a rotary ellipsoidal shell with a diameter of 3350 mm is taken as an example, the rotary ellipsoidal shell has a rotary ellipsoidal modulus of 1.6, the annular diameter of the partitioned thick shell 4 is set to 2840 mm, the low-pressure liquid deep drawing pressure is 1.0 MPa, the high-pressure liquid deep drawing pressure is 10 MPa, and the thickness of the blank 7 is 6 mm. The specific deep drawing process of the liquid deep drawing box bottom is as follows: S1, blank 7 pre-positioning: The blank 7 is placed on the concave die 5, the deep drawing pressure edge 2 device applies a stable pressure, and the deep drawing punch 1 contacts the blank 7. The partitioned thick shell 4 is located at the initial position, which ensures that there is a certain gap between the partitioned thick shell 4 and the blank 7.

[0043] S2, liquid chamber liquid filling: The liquid chamber pressure is loaded to 1 MPa, the loading pressure is controlled by a hydraulic servo valve, and the pressure control accuracy is 0.1 MPa.

[0044] S3, low-pressure liquid deep drawing: The above-mentioned pressure and liquid chamber pressure are kept unchanged, the deep drawing punch 1 starts to move until the deep drawing position reaches 766 mm, at this time, the slope of the tangent line between the deep drawing punch 1 and the blank 7 is 1.

[0045] S4, reverse pressure pressure reduction: When the tangent slope of the drawing punch 1 and the blank 7 is equal to 1, the unloading of the pressure in the drawing liquid chamber 3 begins, and the drawing liquid chamber 3 is always kept open. The displacement of the drawing punch 1 is kept unchanged, the reverse movement of the partitioned thick shell 4 contacts the blank 7, and a certain back pressure is applied. At this time, the low-pressure liquid chamber 31 and the high-pressure liquid chamber 32 are no longer communicated and are separated by the partitioned thick shell 4.

[0046] S5, pressure boosting of the suspended area: The pressure of the high-pressure liquid chamber 32 is increased to 10 MPa, and the position of the drawing punch 1 is kept unchanged.

[0047] S6, high-pressure liquid drawing: The drawing punch 1 moves at a constant speed, and the partitioned thick shell 4 moves synchronously and in the same direction on the back surface, and the contact pressure of the partitioned thick shell 4 and the blank 7 is controlled by the back pressure to ensure the pressure of the thick shell liquid chamber 41.

[0048] S7, pressure relief and part taking: After the drawing displacement is completed, the position of the drawing punch 1 is kept unchanged, the drawing liquid chamber 3 is unloaded to no pressure, and the thick shell liquid chamber 41 is unloaded to no pressure, and then the drawing punch 1 is returned to zero.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A device for integrally forming a launch vehicle box bottom with reduced labor, characterized by, It comprises a drawing punch (1), a drawing binder (2), a partitioned thick shell (4), a die (5) and a control system (6). A plate blank (7) is arranged on the die (5) and the edge part is pressed by the drawing binder (2), a drawing liquid chamber (3) is formed between the plate blank (7) and the die (5), the partitioned thick shell (4) is arranged in the die (5) and divides the drawing liquid chamber (3) into a low-pressure liquid chamber (31) and a high-pressure liquid chamber (32), and the drawing punch (1) is arranged above the die (5). At the beginning of the processing and forming, the partitioned thick shell (4) is in an initial state and has a gap with the plate blank (7), the low-pressure liquid chamber (31) and the high-pressure liquid chamber (32) are both in a pressure relief state and are in communication with each other, the drawing punch (1) is driven to move towards the die (5) so as to perform top pressure forming processing on the plate blank (7) until the plate blank (7) contacts the top of the partitioned thick shell (4) so that the low-pressure liquid chamber (31) and the high-pressure liquid chamber (32) are not in communication, then the drawing punch (1) moves synchronously with the partitioned thick shell (4), the pressure in the high-pressure liquid chamber (32) is increased and is higher than the pressure in the low-pressure liquid chamber (31) until the plate blank (7) is completed to be pressed and formed. The control system (6) is respectively connected with the drawing punch (1), the drawing binder (2) and the partitioned thick shell (4).

2. The integrated power saving forming device for a launch vehicle tank bottom according to claim 1, wherein The bottom of the partitioned thick shell (4) is provided with a thick shell liquid chamber (41), and the top is provided with a sealing structure, the movement of the partitioned thick shell (4) is driven by the pressure of the thick shell liquid chamber (41), and the pressure in the thick shell liquid chamber (41) can drive the partitioned thick shell (4) to move.

3. The integrated power saving forming device for the launch vehicle tank bottom according to claim 1, characterized in that, The slope of the tangent line between the drawing punch (1) and the plate blank (7) is 1, which is the demarcation point between the low-pressure liquid chamber (31) and the high-pressure liquid chamber (32).

4. The integrated power saving forming apparatus for a launch vehicle tank bottom according to claim 1, wherein The drawing punch (1), the drawing binder (2) and the partitioned thick shell (4) are all driven by fluid, and the fluid is liquid, gas or semi-solid medium.

5. The integrated power saving forming apparatus for a launch vehicle tank bottom according to claim 1, wherein The drawing punch (1) comprises a punch pressure loading tool, the punch pressure loading tool is provided with a punch loading liquid chamber (11), and the movement of the drawing punch (1) is controlled by the pressure of the punch loading liquid chamber (11).

6. The integrated power saving forming apparatus for a launch vehicle tank bottom according to claim 1, wherein When the partitioned thick shell (4) moves synchronously with the drawing punch (1), the partitioned thick shell (4) is set to have a fixed back pressure, so that the partitioned thick shell (4) and the drawing punch (1) can run synchronously while having a constant normal force with the plate blank (7).

7. The integrated power saving forming apparatus for a launch vehicle tank bottom according to claim 1, wherein When the high-pressure liquid chamber (32) is independently loaded, the pressure of the low-pressure liquid chamber (31) in the central region is zero.

8. The integrated power saving forming apparatus for a launch vehicle tank bottom according to claim 1, wherein The bottom material is aluminum alloy or stainless steel, the thickness of the bottom is 2-15 mm, and the diameter of the bottom is 2000-10000 mm.

9. A method of integral power saving forming of a launch vehicle tank bottom, characterized by, It comprises the following steps: S1, plate blank (7) pre-positioning: the plate blank (7) is placed on the die (5), the drawing binder (2) presses the edge part of the plate blank (7), and the drawing punch (1) is in contact with the plate blank (7); S2, filling liquid in the drawing liquid chamber (3): filling liquid in the drawing liquid chamber (3) to load pressure; S3, low-pressure liquid drawing: keep the edge compression force and the drawing liquid chamber (3) pressure unchanged, the drawing punch (1) starts to move until the slope of the tangent line of the drawing punch (1) and the plate blank (7) is 1; S4, reverse pressure reduction: when the slope of the tangent line of the drawing punch (1) and the plate blank (7) is equal to 1, the pressure in the drawing liquid chamber (3) is unloaded, and the drawing liquid chamber (3) is kept open at this time, and the drawing punch (1) continues to move, the partition thick shell (4) is in contact with the plate blank (7) and applies back pressure; S5, high-pressure liquid chamber (32) pressure increase: the high-pressure liquid chamber (32) pressure increases and the drawing punch (1) position remains unchanged; S6, high-pressure liquid drawing: the drawing punch (1) moves at a constant speed, and the partition thick shell (4) moves synchronously and in the same direction on the back, and the contact pressure of the partition thick shell (4) and the plate blank (7) is controlled by back pressure, ensuring that the high-pressure liquid chamber (32) pressure is stable and reliable and can be adjusted by servo; S7, pressure relief and part taking: after the drawing is displaced to the position, the drawing punch (1) position remains unchanged, the drawing liquid chamber (3) is unloaded to no pressure, and the partition thick shell (4) back pressure is unloaded to no pressure, and the drawing punch (1) is returned to zero.

10. The method of claim 9, wherein the method further comprises: In S2, the partition thick shell (4) is located at the initial position, which ensures that there is a gap between the partition thick shell (4) and the plate blank (7).

11. The method of claim 9 or 10, wherein The bottom of the partition thick shell (4) is provided with a thick shell liquid chamber (41), and the top is provided with a sealing structure. The action of the partition thick shell (4) is driven by the pressure of the thick shell liquid chamber (41). Controlling the pressure inside the thick shell liquid chamber (41) can drive the partition thick shell (4) to act.

12. The method of claim 9 or 10, wherein the method is a one-piece power saving forming method of a launch vehicle tank bottom. The drawing punch (1) includes a punch pressure loading tool, and the punch loading liquid chamber (11) is arranged in the punch pressure loading tool. The action of the drawing punch (1) is controlled by the pressure of the punch loading liquid chamber (11).

13. The method of claim 9 or 10, wherein the method is a one-piece power saving forming method of a launch vehicle tank bottom, characterized by, When the partition thick shell (4) and the drawing punch (1) move synchronously, the partition thick shell (4) is set to a fixed back pressure, which ensures that the partition thick shell (4) and the drawing punch (1) run synchronously while having a constant normal force with the plate blank (7).

14. The method of claim 9 or 10, wherein the method is a one-piece power saving forming method of a launch vehicle tank bottom. When the high-pressure liquid chamber (32) is independently loaded, the center area low-pressure liquid chamber (31) pressure is zero.

15. The method of claim 9 or 10, wherein the method is a one-piece power saving forming method of a launch vehicle tank bottom, characterized by, The box bottom material is aluminum alloy or stainless steel, the box bottom thickness range is 2-15mm, and the box bottom diameter is 2000-10000mm.

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