Flexible vacuum adsorption device and method for machine milling of integrally formed box bottom of carrier rocket

Abstract

The invention provides a flexible vacuum adsorption device for machine milling of an integrally-formed box bottom of a carrier rocket storage box and a clamping method, and belongs to the technical field of thin-wall part clamping. The flexible vacuum adsorption device is mainly composed of a mold main body, a vacuum adsorption module and a gas circuit control module, the vacuum adsorption module is fixedly connected to the mold main body, the gas circuit control module is communicated with the vacuum adsorption module through a gas pipe, and the box bottom is initially positioned and clamped through the mold main body. Then full-range supporting and adsorption clamping are achieved through the array type vacuum adsorption module, and grouping adsorption control and adsorption effect inspection of the adsorption module are achieved through the gas circuit control module through a flow divider. A multi-module array type vacuum adsorption clamping mode is adopted, rigid holding of the integrally-formed box bottom is achieved, deformation in the machining process is restrained, the stability in the machining process is improved, and the beneficial effects of controlling the wall thickness of a product and improving the machining efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of thin-walled part clamping, and specifically relates to a flexible vacuum adsorption device and a clamping method for milling the bottom of an integrally formed tank of a launch vehicle. Background Art

[0002] The propellant tank is the main load-bearing component of a launch vehicle and is a large-sized thin-walled structural part formed by high specific strength aluminum alloy thin plates. Its weight accounts for 80%-90% of the total weight of the rocket and often serves in extreme working conditions, such as a thrust of more than a thousand tons of force, an acceleration environment of 3-6g, and an ambient temperature below -250°C during launch. The bottom of the tank is located at both ends of the rocket fuel tank and is a key component of the tank.

[0003] Compared with the manufacturing methods of digital segment milling and combined welding, the integrally formed tank bottom generally adopts integral spinning, that is, cold spinning in the middle combined with hot spinning at the ports for forming, which can effectively reduce the weld seams, maintain the material continuity, and improve the reliability and overall mechanical properties of the tank bottom. At present, the integrally formed tank bottom has been gradually applied to launch vehicle tanks.

[0004] For example, in the Chinese invention patent with the publication number CN114700693A, only through processes such as welding process blocks, clamping of the inner surface tooling, rough machining of the outer surface, stress relief annealing, secondary clamping of the outer surface tooling, and finish machining of the outer surface, the positioning of the outer surface of the tank bottom and the control of the thickness are achieved.

[0005] However, the integrally structured tank bottom is a typical large thin-walled structure similar to an ellipsoid, with characteristics such as large geometric dimensions, large diameter-thickness ratio, and high material removal ratio. When using traditional membrane tire tooling for clamping, due to clamping errors, the mold tire cannot fit completely, and bulging deformation is likely to occur during the machining process. For the machining deformation of the tank bottom, the existing method of using internal support can, to a certain extent, reduce the deformation and improve the machining rigidity, but it cannot completely suppress the local outward deformation, such as local bulging, which will lead to unstable machining process, low machining efficiency, and poor consistency of the machined wall thickness.

[0006] Therefore, designing a device with increased system rigidity, suppressing deformation, and ultimately achieving conformal holding is of great significance for improving the machining quality and efficiency of the tank bottom. Summary of the Invention

[0007] Aiming at the defects in the prior art, the purpose of the present invention is to provide a flexible vacuum adsorption device and a clamping method for milling the integrally formed tank bottom of a launch vehicle.

[0008] According to a flexible vacuum adsorption device for milling the integrally formed tank bottom of a launch vehicle provided by the present invention, it includes: a mold tire main body 1, a vacuum adsorption module 2, and a gas path control module 3;

[0009] The vacuum adsorption module 2 can be firmly connected to the tire mold body 1. One end of the gas circuit control module 3 is communicated with the vacuum adsorption module 2 through a gas circuit extending inside the tire mold body 1, and the other end is located outside the tire mold body 1.

[0010] Preferably, the tire mold body 1 includes: a positioning boss 101, a profiling surface 102, an adsorption module mounting assembly 103, a cylindrical surface 104, and a skirt 105;

[0011] The outer circle part of the positioning boss 101 is matched with the central hole at the bottom of the box to realize the positioning of the box bottom;

[0012] The profiling surface 102 is consistent with the theoretical geometric inner profile surface of the box bottom to realize the overall fitting of the inner profile surface of the box bottom;

[0013] The adsorption module mounting assembly 103 is used for the installation of the vacuum adsorption module 2;

[0014] Threaded connection holes and lifting holes are provided on the skirt 105 for product fixation and tooling lifting;

[0015] The positioning boss 101, the profiling surface 102, the adsorption module mounting assembly 103, the cylindrical surface 104, and the skirt 105 work together to realize product fixation.

[0016] Preferably, the vacuum adsorption module 2 includes: a base 201, a movable suction cup 202, a stop bolt 203, a driving screw 204, a suction cup air pipe joint 205, an air pipe 206, a tee air pipe joint 207, and a sealing strip 208;

[0017] The base 201 is fixed to the tire mold body 1 by bolts, and the movable suction cup 202 is slidably connected to the inner hole of the base 201;

[0018] One end of the driving screw 204 is threadedly connected to the base 201, and the other end is connected to the movable suction cup 202. By rotating the driving screw 204, the forward and backward movement of the movable suction cup 202 can be realized;

[0019] The front end pin part of the stop bolt 203 is slidably connected to the guide groove of the movable suction cup 202, and the rear end threaded part is threadedly connected to the base 201. By tightening and loosening the stop bolt 203, the fixation and guided movement of the movable suction cup 202 can be realized;

[0020] The suction cup air pipe joint 205 is threadedly connected to the bottom of the air extraction hole on the movable suction cup 202. The tee air pipe joint 207 is connected to the suction cup air pipe joint 205 through the air pipe 206. Through the tee air pipe joint 207, the vacuum adsorption module 2 that converges into one path finally is communicated with the gas circuit control module 3.

[0021] Preferably, the gas path control module 3 includes: a gas path parallel row assembly 301, a connecting air pipe 302, and a diverter assembly 303;

[0022] The gas path parallel row assembly 301 is fixedly connected to the tire mold body 1 through its upper bracket, and is in gas path communication with the vacuum adsorption module 2 through the three-way air pipe joint 207 and the air pipe 206 of the vacuum adsorption module 2;

[0023] One end of the connecting air pipe 302 is connected to the gas path parallel row assembly 301, and the other end is connected to the diverter assembly 303;

[0024] The diverter assembly 303 is connected to a vacuum pump;

[0025] A vacuum gauge is installed at the connection end of the connecting air pipe 302 and the diverter assembly 303 for monitoring airtightness;

[0026] The gas path control module 3 is grouped for control and monitoring to realize the clamping reliability check before processing and the airtightness monitoring during the processing.

[0027] Preferably, the adsorption surface of the vacuum adsorption module 2 is square, and the adsorption surface is geometrically consistent with the profiling surface 102 of the tire mold body 1 to determine the installation direction of the vacuum adsorption module 2.

[0028] Preferably, the vacuum adsorption modules 2 are arranged in an array, the adsorption surface size of the vacuum adsorption module 2 is A×A, and 100mm≤A≤200mm, and the row spacing and column spacing are both not greater than 0.75A.

[0029] Preferably, the moving stroke range of the driving screw 204 on the vacuum adsorption module 2 can meet:

[0030] When the movable suction cup 202 ejects, the adsorption surface can protrude from the outer surface of the tire mold body 1,

[0031] When the movable suction cup 202 retracts, the sealing strip 208 on the adsorption surface is lower than the outer surface of the tire mold body 1.

[0032] Preferably, the height of the sealing strip 208 of the vacuum adsorption module 2 protruding from the adsorption surface is not less than 1.5mm.

[0033] Preferably, the number of the vacuum adsorption modules 2 is multiple, and they are evenly distributed at intervals along the circumferential direction in multiple annular regions of the profiling surface 102.

[0034] A method for clamping by using a flexible vacuum adsorption device for face milling of the bottom of an integral forming box of a launch vehicle according to the present invention includes the following steps:

[0035] Step 1: Rotate the driving screw 204 to retract all the movable suction cups 202 of the vacuum adsorption module 2, and ensure that all the sealing strips 208 are lower than the outer surface of the tire body 1.

[0036] Step 2: Position the bottom of the box on the tire body 1 through the positioning boss 101, press it tightly from above with a gland, and then fix the bottom of the box on the tooling of the tire body 1 with bolts from below.

[0037] Step 3: Rotate the driving screw 204 to push out all the movable suction cups 202 of the vacuum adsorption module 2 from top to bottom in sequence and tighten the driving screw 204, and then fix the position of the movable suction cup 202 with a stop bolt 203.

[0038] Step 4: Start the vacuum pump, open the vacuum valves in sequence, and observe whether the vacuum gauge maintains within the normal range when the vacuum pump is always on.

[0039] Step 5: Close the vacuum valves, observe the pressure drop rate of each vacuum gauge, which should be less than 0.01 bar / 5 min. If not satisfied, the leakage cause should be found.

[0040] Step 6: After the test is completed, turn off the vacuum pump, unplug the air pipe, and hoist the whole into the machine tool for subsequent machining.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention adopts a clamping method of multi-module array vacuum adsorption. Compared with the traditional clamping method with only internal support, while providing internal support, it provides an inward adsorption force, solves the problem of outward bulging and deformation during the machining of the bottom of the box, realizes the rigid fixation of the bottom of the box, inhibits the generation of deformation during the machining process, improves the stability of the machining process, and further improves the machining quality and efficiency of the bottom of the box, which has a very beneficial effect on the control of the product wall thickness and the improvement of the machining efficiency.

[0043] 2. Compared with the overall adsorption method, the present invention adopts multi-module vacuum adsorption, with a small sealing area, better sealing performance, and higher adsorption reliability.

[0044] 3. Compared with filling a liquid-phase material in the gap between the bottom of the box and the tooling and realizing the fixation of the bottom of the box by stimulating the liquid-solid conversion of the liquid-phase material through external conditions, the present invention has a simple structure, convenient operation, and low cost.

[0045] 4. The gas path control module of the present invention adopts group control and monitoring, which is convenient for leak point detection and process airtightness monitoring.

[0046] 5. The clamping method provided by the present invention realizes off-machine clamping, reduces or even avoids the shutdown of the clamping equipment, and improves the utilization rate of large gantry equipment. Brief Description of the Drawings

[0047] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non - limiting embodiments read in conjunction with the accompanying drawings:

[0048] Figure 1 It is a schematic comparison diagram of the whole of the present invention and each assembly structure;

[0049] Figure 2 It is a schematic comparison diagram of the cross - sectional structure of the main body of the type tire of the present invention from multiple perspectives;

[0050] Figure 3 It is a schematic comparison diagram of the structure of the vacuum adsorption module of the present invention from multiple perspectives;

[0051] Figure 4 It is a schematic diagram of the structure of the gas path control module of the present invention;

[0052] Figure 5 It is a schematic diagram of the whole structure of the present invention.

[0053] As shown in the figure:

[0054]

[0055] Detailed Embodiments

[0056] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all fall within the protection scope of the present invention.

[0057] As Figures 1 to 4 shown, the present invention provides a flexible vacuum adsorption device for the end - milling of the integral - formed bottom of a launch vehicle, including: a main body of the type tire 1, a vacuum adsorption module 2, and a gas path control module 3;

[0058] Furthermore, the form tire body 1 includes: a positioning boss 101, a profiling surface 102, an adsorption module mounting assembly 103, a cylindrical surface 104, and a skirt 105; the outer circular part of the positioning boss 101 is matched with the central hole at the bottom of the box to achieve bottom positioning of the box; the profiling surface 102 is consistent with the theoretical geometric inner profile surface of the box bottom to achieve overall fitting of the inner profile surface of the box bottom; the adsorption module mounting assembly 103 is used for mounting the vacuum adsorption module 2; the adsorption module mounting assembly 103 is preferably an installation hole structure; threaded connection holes and lifting holes are designed on the skirt 105 for product fixing and tooling lifting; the positioning boss 101, the profiling surface 102, the cylindrical surface 104, and the skirt 105 are connected in sequence.

[0059] Furthermore, the vacuum adsorption module 2 includes: a base 201, a movable suction cup 202, a stop bolt 203, a driving screw 204, a suction cup air pipe joint 205, an air pipe 206, a three-way air pipe joint 207, and a sealing strip 208. The base 201 is fixed on the form tire body 1 by bolts. The movable suction cup 202 is slidably connected with the inner hole of the base 201. One end of the driving screw 204 is threadedly connected with the base 201, and the other end is connected with the movable suction cup 202. By rotating the driving screw 204, the forward and backward movement of the movable suction cup 202 can be realized; the front pin part of the stop bolt 203 is slidably connected with the guide groove of the movable suction cup 202, and the rear threaded part is threadedly connected with the base 201. By tightening and loosening the stop bolt 203, the fixing and guiding movement of the movable suction cup 202 can be realized; the suction cup air pipe joint 205 is threadedly connected with the bottom of the air extraction hole on the movable suction cup 202. The three-way air pipe joint 207 is connected with the suction cup air pipe joint 205 through the air pipe 206. Through the three-way air pipe joint 207, the vacuum adsorption module 2 that converges into one path finally is communicated with the air circuit control module 3;

[0060] Furthermore, the air circuit control module 3 includes an air circuit parallel row assembly 301, a connecting air pipe 302, and a shunt assembly 303; the air circuit parallel row assembly 301 is connected and fixed to the form tire body 1 through its upper bracket, and is air-circuit connected with the vacuum adsorption module 2 through the three-way air pipe joint 207 and the air pipe 206; one end of the connecting air pipe 302 is connected with the air circuit parallel row assembly 301, and the other end is connected with the shunt assembly 303; the shunt assembly 303 is connected with a vacuum pump; a vacuum gauge is installed at the connection end of the connecting air pipe 302 and the shunt assembly 303 for monitoring airtightness; the air circuit control module 3 is grouped for control and monitoring to achieve reliability inspection of clamping before processing and airtightness monitoring during processing;

[0061] Furthermore, the adsorption surface of the vacuum adsorption module 2 is square, and the adsorption surface is geometrically consistent with the profiling surface 102 of the tire mold body 1. By designing the adsorption surface to be square, the installation direction of the vacuum adsorption module 2 can be determined to avoid incorrect installation direction.

[0062] Furthermore, the vacuum adsorption modules 2 are arranged in an array, the size of the adsorption surface is 150 mm × 150 mm, and the row spacing and column spacing are both 100 mm.

[0063] Furthermore, the moving stroke range of the driving screw 204 on the vacuum adsorption module 2 should be able to meet the following requirements: when the movable suction cup 202 extends, the adsorption surface can protrude from the outer surface of the tire mold body 1; when the movable suction cup 202 retracts, the sealing strip 208 on the adsorption surface is lower than the outer surface of the tire mold body 1.

[0064] As Figure 5 shown, the present invention also provides a clamping method for a flexible vacuum adsorption device for the integral forming of the bottom of a launch vehicle by machine milling, and the specific steps are as follows:

[0065] Step 1: Rotate the driving screw 204 to retract all the movable suction cups 202 of the vacuum adsorption modules 2, and ensure that all the sealing strips 208 are lower than the outer surface of the tire mold body 1.

[0066] Step 2: Position the bottom of the box on the tire mold body 1 through the positioning boss 101, press it tightly from above with a gland, and then fix the bottom of the box on the tooling of the tire mold body 1 with bolts from below.

[0067] Step 3: Rotate the driving screw 204 to sequentially extend all the movable suction cups 202 of the vacuum adsorption modules 2 from top to bottom and tighten the driving screw 204, and then fix the position of the movable suction cup 202 with a stop bolt 203.

[0068] Step 4: Start the vacuum pump, open the vacuum valves in sequence, and observe whether the vacuum gauge maintains within the normal range when the vacuum pump is always on.

[0069] Step 5: Close the vacuum valves, observe the pressure drop rate of each vacuum gauge, which should be less than 0.01 bar / 5 min. If not satisfied, the leakage cause should be found.

[0070] Step 6: After the test is completed, turn off the vacuum pump, unplug the air pipe, and lift the whole into the machine tool for subsequent machining.

[0071] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0072] The specific embodiments of the present invention have been described above. It should be understood that the present invention 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 do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A flexible vacuum adsorption device for integral forming box bottom machining of a launch vehicle, characterized in that, Including: A tire mold body (1), a vacuum adsorption module (2), and a gas circuit control module (3); The vacuum adsorption module (2) can be firmly connected to the tire mold body (1). One end of the gas circuit control module (3) is communicated with the vacuum adsorption module (2) through a gas circuit extending inside the tire mold body (1), and the other end is located outside the tire mold body (1).

2. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 1, wherein, The tire mold body (1) includes: a positioning boss (101), a profiling surface (102), an adsorption module mounting assembly (103), a cylindrical surface (104), and a skirt (105); The outer circle part of the positioning boss (101) cooperates with the central hole at the bottom of the box to achieve bottom positioning of the box; The profiling surface (102) is consistent with the theoretical geometric inner profile surface of the box bottom to achieve overall fitting of the inner profile surface of the box bottom; The adsorption module mounting assembly (103) is used for the installation of the vacuum adsorption module (2); Threaded connection holes and lifting holes are provided on the skirt (105) for product fixation and tooling lifting; The positioning boss (101), the profiling surface (102), the adsorption module mounting assembly (103), the cylindrical surface (104), and the skirt (105) work together to achieve product fixation.

3. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 1, wherein The vacuum adsorption module (2) includes: a base (201), a movable suction cup (202), a stop bolt (203), a driving screw (204), a suction cup air pipe joint (205), an air pipe (206), a three-way air pipe joint (207), and a sealing strip (208); The base (201) is fixed to the tire mold body (1) by bolts, and the movable suction cup (202) is slidably connected to the inner hole of the base (201); One end of the driving screw (204) is threadedly connected to the base (201), and the other end is connected to the movable suction cup (202). By rotating the driving screw (204), the forward and backward movement of the movable suction cup (202) can be achieved; The front pin part of the stop bolt (203) is slidably connected to the guide groove of the movable suction cup (202), and the rear threaded part is threadedly connected to the base (201). By tightening and loosening the stop bolt (203), the fixation and guided movement of the movable suction cup (202) can be achieved; The suction cup air pipe joint (205) is threadedly connected to the bottom of the air extraction hole on the movable suction cup (202). The three-way air pipe joint (207) is connected to the suction cup air pipe joint (205) through the air pipe (206). Through the three-way air pipe joint (207), the vacuum adsorption module (2) that converges into one path finally is communicated with the gas circuit control module (3).

4. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 1, wherein, The gas circuit control module (3) includes: a gas circuit parallel row assembly (301), a connecting air pipe (302), and a shunt component (303); The gas circuit parallel row assembly (301) is connected and fixed to the tire mold body (1) through its upper bracket, and is gas-circuit communicated with the vacuum adsorption module (2) through the three-way air pipe joint (207) and the air pipe (206) of the vacuum adsorption module (2); One end of the connecting air pipe (302) is connected to the gas circuit parallel row assembly (301), and the other end is connected to the shunt component (303); The flow divider assembly (303) is connected to a vacuum pump; A vacuum gauge is installed at the connection end between the connecting air pipe (302) and the diverter assembly (303) to monitor air tightness; The gas circuit control module (3) performs group control and monitoring to achieve clamping reliability inspection before processing and air tightness monitoring during processing.

5. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 3, wherein The suction surface of the vacuum suction module (2) is square, and the suction surface is geometrically consistent with the profiling surface (102) of the mold body (1), thereby achieving determination of the installation direction of the vacuum suction module (2).

6. The flexible vacuum adsorption device for integral forming box bottom milling of launch vehicle according to claim 3, characterized in that The vacuum adsorption modules (2) are distributed in an array, the adsorption surface size of the vacuum adsorption modules (2) is A×A, and 100 mm≤A≤200 mm, and the row spacing and column spacing are both no greater than 0.75A.

7. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 3, wherein, The moving stroke range of the driving screw (204) on the vacuum adsorption module (2) can meet the following requirements: When the movable suction cup (202) is pushed out, the suction surface can protrude from the outer surface of the tire body (1). When the movable suction cup (202) is retracted, the sealing strip (208) on the suction surface is lower than the outer surface of the tire body (1).

8. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 7, characterized in that The sealing strip (208) of the vacuum adsorption module (2) protrudes above the adsorption surface by a height of not less than 1.5 mm.

9. The flexible vacuum adsorption device for integral forming box bottom milling of a launch vehicle according to claim 1, characterized in that The vacuum adsorption modules (2) are multiple in number and are evenly spaced along the circumferential direction in multiple annular regions of the contoured surface (102).

10. A clamping method using the flexible vacuum adsorption device for face milling of the integral formed bottom of a launch vehicle described in any one of claims 1 to 9, characterized in that, The following steps are involved: Step 1: Rotate the driving screw (204) to retract the movable suction cups (202) of all vacuum adsorption modules (2), and ensure that the sealing strips (208) are all lower than the outer surface of the tire body (1); Step 2: Position the bottom of the box on the mold body (1) by positioning the positioning boss (101), and use a gland to press it from the top, and then use bolts to fix the bottom of the box on the tooling of the mold body (1) from the bottom; Step 3, rotating the driving screw (204) to push out the movable suction cups (202) of all vacuum adsorption modules (2) from top to bottom in sequence and tightening the driving screw (204), and then fixing the position of the movable suction cups (202) with the stop bolt (203); Step 4: Start the vacuum pump, open the vacuum valves in sequence, and observe whether the vacuum gauge is maintained within the normal range when the vacuum pump is normally open; Step 5. Close the vacuum valve and observe the pressure drop rate of each vacuum gauge, which should be less than 0.01 bar / 5 min. If not, find the cause of the leak. Step 6: After the test is completed, turn off the vacuum pump, unplug the air pipe, and hoist the whole into the machine tool for subsequent machining.

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