Integral power saving forming device and method for launch vehicle box bottom

Abstract

The present application relates to the plastic forming field of large metal thin-walled curved surface components in the field of aerospace, and provides a whole labor-saving forming device and method for a launch vehicle box bottom, which comprises a drawing punch, a drawing binder, a partitioned thick shell, a concave die and a control system; a blank is arranged on the concave die and the edge part is pressed by the drawing binder, a drawing liquid chamber is formed between the blank and the concave die, the partitioned thick shell is arranged in the concave die and divides the drawing liquid chamber into a low-pressure liquid chamber and a high-pressure liquid chamber, and the drawing punch is arranged above the concave die. The present application realizes labor-saving liquid filling drawing regulation and control by increasing the partitioned thick shell to divide the drawing liquid chamber into low-pressure and high-pressure zones, can realize higher loading of the liquid chamber counterforce under the same drawing force condition, thereby improving the effect of liquid filling drawing counter-expansion wrinkle suppression, and also avoids the problem of low utilization rate of equipment tonnage.

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, and the highest dimensional accuracy requirement. Developing 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, and whole additive manufacturing method. Among them, the liquid filling deep drawing method has the advantages of high forming precision, high mechanical performance, 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 uses the normal force applied to the back of the plate to strengthen the constraint on the suspension area of the plate blank (7), changes the stress state of the suspension area, and controls the wrinkling defect. Due to the introduction of the normal stress of the plate, most of the work in the deep 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 accuracy 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 and method 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 concave die, and the control system are included.

[0006] The plate blank is arranged on the concave 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 concave die, the partitioned thick shell is arranged in the concave 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 concave die.

[0007] At the beginning of the forming process, the partitioned thick shell is in an initial state and has a gap with the blank, the low-pressure liquid chamber and the high-pressure liquid chamber are in a pressure relief state and are in communication with each other, the drawing punch is driven to move towards the die, and then the blank can be subjected to the drawing forming process until the 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 drawing punch moves synchronously with the partitioned thick shell, the pressure in the high-pressure liquid chamber is increased and is higher than the pressure in the low-pressure liquid chamber until the blank is completed.

[0008] The control system is connected with the drawing punch, the drawing binder, and the partitioned thick shell, respectively.

[0009] According to the application, a whole labor-saving forming method for a launch vehicle box bottom is provided, which comprises the following steps:

[0010] S1, blank pre-positioning: the blank is placed on the die, the drawing binder compresses the edge of the blank, and the drawing punch contacts the blank;

[0011] S2, liquid chamber filling: the drawing liquid chamber is filled with liquid and loaded with pressure;

[0012] S3, low-pressure liquid filling drawing: the edge compression force and the drawing liquid chamber pressure are kept unchanged, the drawing punch starts to move until the slope of the tangent line of the drawing punch and the blank is 1;

[0013] S4, counter-pressure pressure relief: when the slope of the tangent line of the drawing punch and the blank 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 moves reversely and contacts the blank, and back pressure is applied;

[0014] 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;

[0015] 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 blank is controlled through back pressure, and the high-pressure liquid chamber pressure is stably and reliably servo-adjusted;

[0016] S7, pressure relief and part taking: after the drawing is moved to the 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 returned to zero.

[0017] Preferably, the partitioned thick shell is located at an initial position, and a gap between the partitioned thick shell and the blank is ensured.

[0018] Preferably, the bottom of the partitioned thick shell is configured with a thick shell liquid chamber, and the top is configured with a sealing structure, the action of the partitioned thick shell is driven by the pressure of the thick shell liquid chamber, and controlling the pressure inside the thick shell liquid chamber can drive the partitioned thick shell to act.

[0019] Preferably, the slope of the draw punch at the tangent position of the slab is 1, which is the demarcation point between the low-pressure liquid chamber and the high-pressure liquid chamber.

[0020] Preferably, the draw punch, draw blank holder and partitioned thick shell are all driven by fluid, which can be liquid, gas or semi-solid medium.

[0021] Preferably, the draw punch comprises a punch pressure loading tool, and the punch pressure loading tool is configured with a punch loading liquid chamber, and the action of the draw punch is controlled by the pressure of the punch loading liquid chamber.

[0022] Preferably, when the partitioned thick shell moves synchronously with the draw punch, the partitioned thick shell is set to a fixed back pressure, which ensures that the partitioned thick shell and the draw punch run synchronously while maintaining a constant normal force with the slab.

[0023] Preferably, when the high-pressure liquid chamber is independently loaded, the pressure of the low-pressure liquid chamber in the central region is zero.

[0024] Preferably, the box bottom material is aluminum alloy or stainless steel, the thickness of the box bottom is in the range of 2-15 mm, and the diameter of the box bottom is 2000-10000 mm.

[0025] Compared with the prior art, the present application can increase the liquid chamber pressure and reduce the tonnage of the drawing for large-diameter box bottom liquid-filled drawing forming, thereby realizing precise and energy-saving forming of the rocket box bottom, and having the following beneficial effects:

[0026] 1. The present application realizes labor-saving liquid-filled drawing control by increasing the partitioned thick shell to divide the drawing liquid chamber into low-pressure and high-pressure zones, can realize higher loading of the liquid chamber counterforce under the same drawing force condition, thereby improving the effect of suppressing wrinkling by reverse bulging (for example, for liquid-filled drawing forming of a diameter 3350 box bottom, the drawing equipment is 10000 tons, the maximum pressure of the traditional liquid-filled drawing liquid chamber is 10MPa, the liquid chamber pressure is increased to 20MPa by using the labor-saving liquid-filled 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 condition, the liquid chamber pressure counterforce can be significantly reduced, thereby reducing the requirement for equipment tonnage (for example, for liquid-filled drawing forming of a diameter 3350 box bottom, when the liquid chamber pressure is 10MPa, the tonnage of the traditional liquid-filled drawing equipment needs to be more than 10000 tons, the tonnage of the equipment using the labor-saving liquid-filled drawing device is less than 6500 tons, which is reduced by more than 30%).

[0027] 2、The present application adopts deep-drawing liquid chamber, deep-drawing punch, partitioned thick shell back pressure, and coupling servo control of blank holder force, realizes stage-saving control of liquid-filled deep drawing, realizes real-time adjustment of deep drawing window with the target of controlling wrinkling by adjusting the change curves of liquid chamber pressure, partitioned thick shell back pressure and blank holder force with the deep-drawing punch, avoids the waste of equipment tonnage utilization caused by 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 the ellipsoidal box bottom with a diameter of 3350mm and a module of 1.6, the blank holder force and the liquid chamber pressure loading curve are constant values, and in the early stage of deep drawing, the actual utilization rate of equipment tonnage for part deformation is only 20%, and by adopting the power-saving forming device, variable blank holder force and variable liquid chamber pressure loading can be realized, so that the utilization rate of equipment in the early stage is increased to more than 80%). BRIEF DESCRIPTION OF DRAWINGS

[0028] 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:

[0029] Figure 1 The figure shows a schematic diagram of a power-saving forming device for a whole bottom of a launch vehicle tank, wherein the cross-sectional views of the deep-drawing punch moving downward by different distances are shown on the left and right sides of the figure.

[0030] In the figure, it is shown that:

[0031] Deep-drawing punch 1;

[0032] Punch loading liquid chamber 11;

[0033] Deep-drawing blank holder 2;

[0034] Deep-drawing liquid chamber 3;

[0035] Low-pressure liquid chamber 31;

[0036] High-pressure liquid chamber 32;

[0037] Partitioned thick shell 4;

[0038] Thick shell liquid chamber 41;

[0039] Concave die 5;

[0040] Control system 6;

[0041] Plate blank 7. DETAILED DESCRIPTION

[0042] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0043] Example 1:

[0044] 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 movement of the drawing punch 1, the drawing blank holder 2, and the partitioned thick shell 4 respectively.

[0045] The present invention also provides a method for integral, labor-saving forming of the bottom of a launch vehicle container, comprising the following steps:

[0046] S1, slab 7 pre-positioning:

[0047] The slab 7 is placed on the die 5, and the drawing blank 2 applies stable pressure to the edge of the slab 7, causing the drawing punch 1 to abut against the slab 7. The partitioned thick shell 4 is in the initial position, ensuring that there is a certain gap between the partitioned thick shell 4 and the slab 7.

[0048] S2, Filling of drawing chamber 3 with liquid:

[0049] The pressure in the drawing chamber 3 is applied to p1. The application pressure is controlled by a hydraulic servo valve with a pressure control accuracy of 0.1 MPa.

[0050] S3, Low-pressure liquid filling deep drawing:

[0051] Keeping the blank holder force and the pressure in the drawing chamber 3 unchanged, the drawing punch 1 starts to move until the blank 7 is drawn to a die diameter of x. At this time, the slope of the tangent between the drawing punch 1 and the blank 7 is 1.

[0052] S4, Back pressure reduction:

[0053] When the tangent slope of the drawing punch 1 and the blank 7 is equal to 1, the pressure in the drawing liquid chamber 3 is unloaded, and the drawing liquid chamber 3 is always kept open, at this time, the drawing punch 1 keeps moving, the sub-thick shell 4 moves reversely and contacts the blank 7, and a certain back pressure is applied, and the normal force of the sub-thick shell 4 and the blank 7 is greater than 1.5 MPa.

[0054] S5, high-pressure liquid chamber 32 pressure increase:

[0055] The pressure of the high-pressure liquid chamber 32 is increased to P2, and the position of the drawing punch 1 is kept unchanged.

[0056] S6, high-pressure liquid chamber 32 pressure increase:

[0057] The drawing punch 1 moves at a constant speed, and the sub-thick shell 4 moves synchronously and in the same direction on the back, and the contact pressure of the thick shell and the blank 7 is controlled by the back pressure, so that the pressure of the high-pressure liquid chamber 32 is stable and reliable.

[0058] S7, pressure relief and part taking:

[0059] After the drawing displacement is moved to the position, the position of the drawing punch 1 is kept unchanged, the drawing liquid chamber 3 is unloaded to no pressure, the back pressure of the sub-thick shell 4 is unloaded to no pressure, and then the drawing punch 1 is returned to zero.

[0060] Specifically, the drawing liquid chamber 3 and the back pressure of the sub-thick shell 4 adopt a pressure control mode, and the control of the counterforce is realized through the control system 6. The drawing 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 drawing punch 1 pressure and the back pressure.

[0061] As shown in Figure 1 The bottom of the sub-thick shell 4 is provided with a thick shell liquid chamber 41, and the top is provided with a sealing structure. The action driving of the sub-thick shell 4 is controlled by the pressure of the thick shell liquid chamber 41. Controlling the pressure in the thick shell liquid chamber 41 can drive the sub-thick shell 4 to act and realize the partition of the drawing liquid chamber 3.

[0062] Further, the hydraulic loading makes the two sections of the drawing liquid chamber 3, that is, the interface of the sub-thick shell 4, as the interface point according to the position with a tangent slope of 1. When the slope is greater than 1, the area of the high-pressure liquid chamber 32 changes at a rate that increases with the increase of the drawing displacement, thereby causing the blank 7 to easily wrinkle in the circumferential direction. Therefore, after the drawing to the die diameter x of the blank 7, the independent pressure increase of the high-pressure liquid chamber 32 can significantly reduce the drawing counterforce. The present application can significantly improve the effect of suppressing wrinkling in the liquid drawing, and by using the independent partition liquid chamber pressure control method, the liquid chamber pressure can be increased on the premise that the drawing punch 1 is kept stationary, so as to control the wrinkling defect; the equipment tonnage can be significantly reduced, and the independent partition liquid chamber pressure control makes the center area pressure reduce to zero, and the drawing counterforce reduces +1) ). For the spherical shell, it can be reduced by 0.5 times, and for the ellipsoidal shell with a modulus of 1.6, it can be reduced by 0.28 times, that is, for the ellipsoidal shell with a larger modulus, the drawing counterforce is reduced more obviously; the liquid drawing forming of the ultra-thin box bottom of stainless steel can be realized, and the demand of the ultra-high liquid chamber pressure for the overall forming of the ultra-thin box bottom of stainless steel is solved. The present application can significantly increase the process window of the liquid drawing forming process and improve the stability of the box bottom liquid drawing process.

[0063] It should be noted that the high-pressure fluid suitable for the present application can be liquid water, emulsion, hydraulic oil, gas and semi-solid medium, etc. The present application is not only suitable for ellipsoidal shell box bottom, spherical shell box bottom, conical shell box bottom, etc., and the separation surface of the partitioned thick shell 4 can be selected according to the change of the curvature of the curved surface as the boundary.

[0064] The drawing binder 2 is provided with a binder pressure loading tool, and the binder pressure loading tool can press the drawing binder 2 to realize the compression of the edge part of the blank 7 on the concave die 5.

[0065] Specifically, the drawing punch 1 comprises a punch pressure loading tool, and the punch loading liquid chamber 11 is arranged in the punch pressure loading tool, and the action of the drawing punch 1 is controlled by the pressure of the punch loading liquid chamber 11. The control of the drawing punch 1 adopts a displacement control mode, and the movement of the drawing position is realized by adjusting the pressure difference between the punch loading liquid chamber 11 and the thick shell liquid chamber 41.

[0066] The present application sets an annular thick shell in the drawing reverse direction to isolate the pressure of the drawing liquid chamber 3, thereby establishing a sealed area surrounded by the drawing concave die 5, the blank 7 and the partitioned thick shell 4, and realizing the independent control of the liquid chamber pressure in different areas during the drawing process. Specifically, when the radius of the blank 7 adhering to the drawing punch 1 is less than x (x is defined below), the liquid chamber pressure is low-pressure loading, and the range is 1-5 MPa; when the radius of the blank 7 adhering to the punch is greater than x, the liquid chamber pressure is high-pressure loading, and the range is 10-20 MPa.

[0067] The drawing punch 1 can move along the drawing direction, and when the radius of the blank 7 adhering to the drawing punch 1 is equal to x, the partitioned thick shell 4 is closely adhered to the blank 7, so that the blank 7, the partitioned thick shell 4 and the concave die 5 form an independent sealed space, i.e. a low-pressure liquid chamber 31 and a 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.

[0068] 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 as a fixed back pressure, so as to guarantee that the partitioned thick shell 4 and the drawing punch 1 run synchronously while having a constant normal force with the blank 7, thereby guaranteeing the sealing property of the high-pressure liquid chamber 32.

[0069] The position of the partitioned thick shell 4 along the radial direction is determined according to the tangent slope of the profile section generatrix of the bottom of the box, and the position with a slope of 1 is set as the demarcation point, that is, the position at which the partitioned thick shell 4 starts to contact the blank 7 to form an independent high-pressure sealed interval. For example, when the bottom of the box has a spherical shape, the coordinate of the demarcation point is where r is the radius of the bottom of the box. When the bottom of the box has an ellipsoidal shape, the coordinate of the demarcation point is .

[0070] 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,

[0071] In the drawing process, when the radius of the position at which the blank 7 contacts the die is less than x, the entire drawing liquid chamber 3 is filled with high-pressure liquid, and as the drawing displacement increases, the contact area of the blank 7 with the drawing punch 1 increases. When the radius of the position at which the blank 7 contacts the die 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 low-pressure liquid chamber 31 in the central region is zero, thereby reducing the hydraulic projection area on the back of the drawing punch 1 and reducing the forming tonnage of the equipment.

[0072] In order to further reduce the pressure of the liquid chamber, a plurality of stages of partitioned thick shell 4 units can be added to further reduce the area of the high-pressure liquid chamber 32.

[0073] In the drawing process, the area of the high-pressure liquid chamber 32 becomes smaller and smaller as the drawing displacement increases, that is, the tangent point of the blank 7 and the drawing punch 1 moves upward along the edge of the drawing punch 1, and at the same time, the liquid chamber pressure required by the high-pressure liquid chamber 32 to suppress wrinkling becomes larger and larger, that is, the larger the diameter of the part contacting the die, the larger the liquid chamber pressure required to suppress wrinkling. However, the region that has contacted the die has completed deformation and no longer needs the action of the liquid chamber pressure, and therefore, a larger drawing force is required in the later stage of drawing to balance the reaction force of the back of the blank 7 on the liquid chamber, which causes waste of the tonnage of the equipment. The precise and effective control of the liquid chamber pressure can be achieved by adopting the partitioned and independently controlled liquid chamber pressure, and the tonnage of the equipment can be reduced. At the same time, according to the change of the high-pressure liquid chamber 32 in the drawing process and the change of the reaction force of the liquid chamber pressure in the drawing process, the increase of the drawing force in the later stage of drawing can be greatly reduced, thereby achieving the labor-saving control of the drawing force in the entire drawing process.

[0074] The present application is directed to a whole bottom liquid-filled drawing forming method, and the profile of the bottom of the box includes but is not limited to a spherical bottom, an ellipsoidal bottom, a conical bottom, a rotary quadratic surface bottom, etc. The material of the bottom of the box is aluminum alloy or stainless steel, the thickness of the bottom of the box ranges from 2 mm to 15 mm, and the diameter of the bottom of the box ranges from 2000 mm to 10000 mm, etc. The liquid can be water medium, oil medium, water-oil mixed medium, emulsion, semi-solid medium, gas medium, etc.

[0075] Example 2:

[0076] This embodiment is a preferred example of Example 1. In this embodiment, a rotating ellipsoidal shell with a diameter of 3350 mm is taken as an example, the rotating ellipsoidal modulus is 1.6, the ring diameter of the partitioned thick shell 4 is 2840 mm, the pressure of low-pressure liquid-filled deep drawing is 1.0 MPa, the pressure of high-pressure liquid-filled deep drawing is 10 MPa, and the thickness of the blank 7 is 6 mm. The specific deep drawing process of the liquid-filled deep drawing box bottom is as follows:

[0077] S1, blank 7 positioning:

[0078] 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.

[0079] S2, liquid chamber filling:

[0080] 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.

[0081] S3, low-pressure liquid-filled deep drawing:

[0082] The above pressure and liquid chamber pressure are kept unchanged, the deep drawing punch 1 starts to move, and 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.

[0083] S4, counter-pressure decompression:

[0084] When the slope of the tangent line between the deep drawing punch 1 and the blank 7 is equal to 1, the unloading of the pressure in the deep drawing liquid chamber 3 is started, and the deep drawing liquid chamber 3 is always kept open. The displacement of the deep drawing punch 1 is kept unchanged, the partitioned thick shell 4 moves reversely and 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 connected and are separated by the partitioned thick shell 4.

[0085] S5, pressure increase in the suspended area:

[0086] The pressure of the high-pressure liquid chamber 32 is increased to 10 MPa, and the position of the deep drawing punch 1 is kept unchanged.

[0087] S6, high-pressure liquid-filled deep drawing:

[0088] The deep 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. The contact pressure between the partitioned thick shell 4 and the blank 7 is controlled by back pressure to ensure the pressure of the thick shell liquid chamber 41.

[0089] S7, pressure relief and part taking:

[0090] After the deep drawing displacement is completed, the deep drawing punch 1 is kept in position, the deep drawing liquid chamber 3 is unloaded to no pressure, the thick shell liquid chamber 41 is unloaded to no pressure, and then the deep drawing punch 1 is returned to zero.

[0091] 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.

[0092] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art 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 slab (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 slab (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 slab (7), the low-pressure liquid chamber (31) and the high-pressure liquid chamber (32) are both in a pressure relief state and are communicated 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 slab (7) until the slab (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 communicated, 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 slab (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 action 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 act.

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 slab (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 action 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 slab (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 of the box 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, The whole power saving forming device for the box bottom of the launch vehicle comprises the following steps: S1, slab (7) pre-positioning: the slab (7) is placed on the die (5), the drawing binder (2) presses the edge part of the slab (7), and the drawing punch (1) abuts against the slab (7); S2, drawing liquid chamber (3) liquid filling: the drawing liquid chamber (3) is filled with liquid and loaded with 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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