Clamp tool for machining curved-surface thin-wall part

Abstract

The invention discloses a clamp tool for machining a curved-surface thin-wall part. The device comprises an outer shell, suction cup assemblies and a control system, the outer shell is provided with a space for containing the curved-surface thin-wall part and magnetorheological fluid, the multiple suction cup assemblies are arranged in the outer shell, and a first hemispherical groove is formed in the outer shell; a hemispherical connector in the suction cup assembly is rotationally arranged in the first hemispherical groove, the output end of the telescopic part is in transmission connection with the suction cup part so as to drive the suction cup part to move axially, a mounting frame in the suction cup part is in transmission connection with the telescopic part, and a second hemispherical groove is formed in the mounting frame; the hemispherical structure of the suction cup shaft is rotatably embedded in the second hemispherical groove, and the other end of the suction cup shaft is fixedly provided with a suction cup and is provided with a pressure sensing piece; the control system is in driving connection with the telescopic part and in signal connection with the pressure sensing part and comprises an electromagnetic coil, and the electromagnetic coil is arranged on the outer shell. According to the clamp tool, the application range can be widened, and meanwhile the clamping accuracy is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical tooling, and in particular relates to a fixture tooling for machining curved surface thin-walled parts. Background Art

[0002] In the fields of aerospace, automobile, shipbuilding, etc., curved thin-walled parts of various shapes have always faced the problem of uncontrolled clamping force, which makes it easy for curved thin-walled parts to be deformed during processing and difficult to meet actual processing requirements. Therefore, in order to ensure the processing quality of curved thin-walled parts, the first technical difficulty that needs to be overcome is the problem of clamping control accuracy of curved thin-walled parts.

[0003] In the prior art, the Chinese invention patent with application number 201910396854.9 provides a magnetorheological clamping device for processing thin-walled concave curved parts. Since it has flexible clamping structures such as rubber suction cups and magnetorheological fluid, it can achieve flexible clamping of parts with concave curved surfaces, and improve the reliability and precision of the clamping device by real-time monitoring of the clamping force received by the parts. However, in the above-mentioned clamping device, since the angles of the side suction cups and the magnetorheological unit are fixed horizontally and vertically respectively, it can only clamp thin-walled concave curved parts with relatively flat and simple outer surface shapes, and cannot achieve precise clamping of thin-walled concave curved parts with more complex and diverse outer surface shapes, so it still has certain limitations in use.

[0004] Based on the above, there is an urgent need for a fixture for machining curved thin-walled parts to solve the technical problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a fixture for machining curved thin-walled parts, so as to expand the application range of the fixture and ensure the clamping accuracy of the fixture.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A fixture for processing curved thin-walled parts, comprising an outer shell, a suction cup assembly and a control system, wherein: the outer shell has a space for placing the curved thin-walled parts and magnetorheological fluid, a plurality of suction cup assemblies are respectively arranged on the inner side wall of the outer shell along the circumferential direction and the vertical direction, and a first hemispherical groove is provided on the outer shell; the suction cup assembly comprises a hemispherical joint, a telescopic part, a suction cup part and a pressure sensor, the hemispherical joint is rotatably arranged in the first hemispherical groove, the telescopic part is connected to the hemispherical joint, and the output end of the telescopic part is transmission-connected to the suction cup The suction cup part is configured to drive the suction cup part to perform axial movement, the suction cup part includes a mounting frame and a suction cup shaft, the mounting frame is transmission-connected to the telescopic part, and the mounting frame has a second hemispherical groove, one end of the suction cup shaft is a hemispherical structure, and the hemispherical structure is rotatably embedded in the second hemispherical groove, the other end of the suction cup shaft is fixed with a suction cup, and the pressure sensor is arranged on the suction cup; the control system is drivingly connected to the telescopic part, and is signal-connected to the pressure sensor, the control system includes an electromagnetic coil, and the outer shell is provided with the electromagnetic coil.

[0008] Optionally, the suction cup shaft includes a first shaft body, a second shaft body and a connecting piece, one end of the first shaft body is the hemispherical structure, the other end of the first shaft body is detachably connected to the second shaft body through the connecting piece, and the suction cup is fixed on the second shaft body.

[0009] Optionally, the cross-section of the mounting frame is triangular, and each corner of the mounting frame is provided with the second hemispherical groove, each of the second hemispherical grooves is rotatably connected to a suction cup shaft, and the electromagnetic coil is disposed in the second shaft body.

[0010] Optionally, the outer shell is an inverted frustum-conical structure.

[0011] Optionally, the inner side wall of the outer shell has a plurality of annular grooves along the vertical direction, and the electromagnetic coil is arranged in the annular grooves; the outer shell is also provided with a plurality of magnetic sliders, and the magnetic sliders are slidably arranged in the annular grooves, and the first hemispherical groove is opened on the magnetic sliders.

[0012] Optionally, it also includes a belt transmission structure and a rotating seat, the belt transmission structure includes a driving motor, a driving wheel, a driven wheel, a belt, a transmission shaft and a supporting base column, the control system is electrically connected to the driving motor, the output shaft of the driving motor is transmission-connected to the driving wheel, the driving wheel is connected to the driven wheel through the belt transmission, the driven wheel is sleeved on the transmission shaft, one end of the transmission shaft is rotatably connected to the supporting base column, the other end of the transmission shaft is transmission-connected to the rotating seat, the supporting base column is fixedly arranged, and the rotating seat is transmission-connected to the outer shell.

[0013] Optionally, the belt transmission structure further includes a transmission support assembly, wherein the transmission support assembly includes a transmission support wheel, and the transmission support wheel is rotatably fixed along its own axis and is pressed and connected to the belt.

[0014] Optionally, an auxiliary support chassis is horizontally arranged in the space, the outer side wall of the auxiliary support chassis is sealingly connected to the inner side wall of the outer shell, the magnetorheological fluid is arranged on the upper surface of the auxiliary support chassis, and the auxiliary support chassis is movably arranged in the space along the vertical direction.

[0015] Optionally, an annular sealing cover is detachably provided on the outer shell, and the annular sealing cover is configured to form a bottom of the annular groove. When the annular sealing cover is separated from the outer shell, the auxiliary support chassis can pass through the annular groove and be horizontally arranged in the space.

[0016] Optionally, a collecting tank is further included, and the rotating seat has a liquid recovery groove connecting the collecting tank and the space, and the magnetorheological fluid in the space can flow into the collecting tank through the liquid recovery groove.

[0017] Beneficial effects of the present invention:

[0018] The invention provides a fixture for processing curved thin-walled parts. When the fixture is used, first, magnetorheological fluid is filled into the space of an outer shell; then, according to the outer facade shape of the curved thin-walled part, a hemispherical joint can be rotated in a first hemispherical groove to achieve large-angle coarse adjustment of multiple suction cup assemblies; then, the curved thin-walled part is placed in the space of the outer shell, and the magnetorheological fluid is wrapped on the processing opposite surface of the curved thin-walled part; then, the telescopic part is driven by a control system, so that the telescopic part brings the suction cup part to gradually approach the curved thin-walled part along the axial direction, and at the same time, according to the appearance characteristics of the curved thin-walled part, the suction cup on the suction cup shaft can adaptively rotate at a micro-angle until the suction cups in the multiple suction cup assemblies can all be tightly connected to the outer surface of the curved thin-walled part, and by monitoring the pressure sensor on the suction cup, the clamping force of the multiple suction cup parts on the curved thin-walled part is accurately controlled; finally, the electromagnetic coil on the outer shell is energized to make the magnetorheological fluid phase change and solidify to provide auxiliary support for the curved thin-walled part. Compared with the existing magnetorheological clamping device, through the large-angle coarse adjustment of the suction cup assembly and the small-angle fine adjustment of the suction cup shaft, combined with the auxiliary support of the magnetorheological fluid, the purpose of clamping and supporting curved thin-walled parts with any facade shape can be achieved, which effectively improves the application scope of the clamping tooling and ensures the clamping accuracy of the clamping tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A schematic diagram of the three-dimensional structure of a fixture for machining curved thin-walled parts provided by an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of a fixture for machining curved thin-walled parts provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the three-dimensional structure of a belt transmission structure provided by an embodiment of the present invention;

[0022] Figure 4 A top view of a fixture for machining curved thin-walled parts provided by an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the three-dimensional structure of a suction cup assembly provided in an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the internal structure of the telescopic part provided in an embodiment of the present invention;

[0025] Figure 7 A schematic diagram of the three-dimensional structure of a mounting frame provided by an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of the internal structure of a suction cup portion provided in an embodiment of the present invention.

[0027] In the figure:

[0028] 100. Magnetorheological fluid;

[0029] 1. Base; 11. Fixed seat; 12. Rotating seat; 121. Limiting slot; 122. Liquid recovery tank; 13. Belt transmission structure; 131. Driving motor; 132. Driving wheel; 133. Driven wheel; 134. Belt; 135. Transmission shaft; 136. Supporting bottom column; 137. Transmission support assembly; 1371. Support platform; 1372. Support arm; 1373. Transmission support wheel;

[0030] 2. Install the support; 21. Legs;

[0031] 3. outer shell; 31. liquid guide groove; 32. auxiliary support chassis; 33. annular groove; 34. magnetic slider; 341. first hemispherical groove;

[0032] 4. Suction cup assembly; 41. Hemispherical joint; 42. Telescopic part; 421. Suction cup motor; 422. Fixing plate; 423. Coupling; 424. Ball screw; 425. Telescopic shaft; 43. Suction cup part; 431. Mounting frame; 4311. Telescopic through hole; 4312. Shaft side slot; 432. Suction cup shaft; 433. Suction cup; 4321. First shaft body; 4322. Second shaft body; 4323. Connector; 44. Pressure sensor;

[0033] 51. Electromagnetic coil. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Combine the following Figures 1 to 8 The fixture and tooling for processing curved thin-walled parts provided by the present invention are introduced through specific embodiments.

[0038] refer to Figure 1As shown, in this embodiment, the fixture includes a base 1, a mounting support 2, an outer shell 3, a suction cup assembly 4 and a control system (not shown in the figure). The base 1 is provided with a mounting support 2; the mounting support 2 is an inverted frustum-shaped structure, and the outer shell 3 can be directly inserted into the mounting support 2, so as to facilitate the installation of the fixture, and also provide additional support stability for the outer shell 3 through the mounting support 2; the outer shell 3 has a space for placing the curved thin-walled parts and the magnetorheological fluid 100, and a plurality of suction cup assemblies 4 are arranged in the outer shell 3 along the circumferential direction and the vertical direction, for example, two suction cup assemblies 4 are arranged along the circumferential direction and the vertical direction; the control system can control the movement of the suction cup assembly 4 and the phase state of the magnetorheological fluid 100; the suction cup assembly 4 is used to clamp the curved thin-walled parts located in the space.

[0039] Specifically, the base 1 includes a fixed seat 11 and a rotating seat 12. The fixed seat 11 is preferably a circular structure, so that the fixture can be fixed on the machine tool processing position in any direction through a clamping device such as a vise, and the fixed seat 11 is also convenient for moving the entire fixture; the rotating seat 12 is rotatably arranged on the fixed seat 11 along its own axis, and a mounting support 2 is arranged on the rotating seat 12. When the processing of part of the processing surface of the curved thin-walled part is completed, the control system can analyze the shape and size of the pre-imported curved thin-walled part, and then adjust the movement of the drive motor 131 to rotate the rotating seat 12, so that the unprocessed processing surface part of the curved thin-walled part is aligned with the processing equipment, and there is no need to disassemble or move the curved thin-walled part, thereby facilitating the processing equipment to perform secondary processing on the curved thin-walled part, ensuring high processing quality.

[0040] More specifically, combined with Figure 2 and Figure 3 As shown, in this embodiment, a belt transmission structure 13 is provided in the fixed seat 11, which includes a driving motor 131, a driving wheel 132, a driven wheel 133, a belt 134, a transmission shaft 135 and a supporting base column 136. The driving motor 131 is electrically connected to the control system, the driving motor 131 is fixedly arranged in the fixed seat 11, the output shaft of the driving motor 131 is connected to the driving wheel 132, the driving wheel 132 is connected to the driven wheel 133 through the belt 134, the driven wheel 133 is sleeved on the transmission shaft 135, and the surface of the supporting base column 136 can be provided with a rotation groove or an additional sleeve, so that one end of the transmission shaft 135 is connected to the supporting base column 136 in rotation, and the other end of the transmission shaft 135 is connected to the rotating seat 12 in transmission, and the supporting base column 136 is fixedly arranged in the fixed seat 11. The above-mentioned belt transmission structure 13 can realize the stable rotation of the rotating seat 12, and the transmission power is large. Compared with the gear transmission method, it does not need frequent maintenance or replacement of lubricating oil, etc., which reduces the maintenance cost and cycle.

[0041] More specifically, the belt transmission structure 13 in this embodiment further includes a transmission support assembly 137, referring to Figure 3 As shown, it includes a support platform 1371, a support arm 1372 and a transmission support wheel 1373. The support platform 1371 is a U-shaped plate structure, and its horizontal part is provided with a through hole for the output shaft of the driving motor 131 to rotate and pass through, and its vertical part is fixedly connected to the above-mentioned support arm 1372. The transmission support wheel 1373 can be rotatably connected to the support arm 1372 along its own axis, and is pressed and connected to the belt 134. On the one hand, the purpose of fixing the transmission support wheel 1373 in the fixed seat 11 can be achieved through the support platform 1371 and the support arm 1372. On the other hand, the fixed transmission support wheel 1373 can provide additional transmission force for the belt 134 to reduce the load and torque received by the driving wheel 132 and the driven wheel 133 during operation, thereby ensuring the use rigidity and service life of the belt 134 transmission mechanism.

[0042] Continue to refer Figure 1 As shown, in order to improve the connection stability between the mounting support 2 and the rotating seat 12, in the present embodiment, a plurality of legs 21 are arranged at equal intervals along the circumferential direction on the outer wall of the mounting support 2, and a plurality of limiting slots 121 are opened on the rotating seat 12, and the legs 21 are embedded in the limiting slots 121 one by one, so as to enhance the connection stability between the mounting support 2 and the rotating seat 12 by increasing the contact surface area.

[0043] Preferably, reference Figure 3 As shown, the outer shell 3 provided in this embodiment is an inverted truncated cone structure, so that the curved thin-walled parts can be placed in the space at a suitable depth according to the size of the horizontal cross-sectional area, and it is also convenient for the staff to accurately control the amount of magnetorheological fluid 100 according to the depth of the curved thin-walled parts, so as to achieve the purpose of cost saving. In this embodiment, the control system includes electromagnetic coils 51 evenly distributed in the outer shell 3, and it should be noted that the density of the electromagnetic coils 51 increases from bottom to top to maintain the uniformity of the magnetic field in the space of the outer shell 3. Further, refer to Figure 1 , Figure 4 As shown, the inner wall of the outer shell 3 is provided with a plurality of vertically extending liquid guiding grooves 31, which can ensure that the magnetorheological fluid 100 is poured into the space along a predetermined path, thereby preventing the magnetorheological fluid 100 from splashing during the pouring process and preventing unnecessary waste.

[0044] Specifically, Figure 2As shown, an auxiliary support chassis 32 is horizontally arranged in the space of the outer shell 3, and the outer side wall of the auxiliary support chassis 32 is sealed and connected to the inner side wall of the outer shell 3, so that the magnetorheological fluid 100 is poured on the upper surface of the auxiliary support chassis 32, and the auxiliary support chassis 32 can be movably arranged in the space along the vertical direction. This allows the staff to adjust the height of the auxiliary support chassis 32 in the outer shell 3 by selecting an auxiliary support chassis 32 of appropriate horizontal cross-sectional area to be set up in the space, thereby avoiding the situation of loading the magnetorheological fluid 100 at the bottom of the auxiliary support chassis 32, thereby effectively reducing the amount of magnetorheological fluid 100 used.

[0045] More specifically, in this embodiment, the auxiliary support chassis 32 includes a chassis body and a flexible insulating rubber film, and the flexible insulating rubber film is coated on the upper surface of the chassis body, so that the flexible insulating rubber film can provide a certain degree of anti-collision protection for the curved thin-walled parts. In other embodiments, an electromagnetic coil 51 can also be set in the chassis body to further enhance the strength of the magnetorheological fluid 100 after curing and improve the support stability of the curved thin-walled parts. At the same time, the flexible insulating rubber film can also prevent the current generated after the chassis body is powered on from interfering with and damaging the curved thin-walled parts.

[0046] Exemplarily, the specific implementation method of the auxiliary support chassis 32 to achieve height adjustment in the space is as follows: the inner side wall of the outer shell 3 has a plurality of annular grooves 33 in the vertical direction. In this embodiment, the annular grooves 33 and the liquid guide grooves 31 are arranged alternately. The above-mentioned electromagnetic coil 51 is arranged in the annular groove 33; in addition, the outer shell 3 is detachably provided with an annular sealing cover (not shown in the figure), and the annular sealing cover serves as the groove bottom of the annular groove 33, that is, the annular groove 33 is an annular through groove, and the space in the outer shell 3 can be connected to the external environment through the annular through groove. Usually, the annular sealing cover is arranged at the groove bottom of the annular groove 33 to prevent the magnetorheological fluid 100 in the space from leaking outward. When the annular sealing cover is separated from the outer shell 3, the staff judges the selected size of the auxiliary support chassis 32 according to the height of the annular groove 33 covered by the annular sealing cover, and then passes the selected auxiliary support chassis 32 through the annular groove 33 and arranges it horizontally in the space of the outer shell 3, thereby completing the installation of the auxiliary support chassis 32. When the height of the auxiliary support chassis 32 needs to be adjusted, the staff selects an auxiliary support chassis 32 with other horizontal cross-sectional areas, removes the annular sealing cover at other heights, and then installs the auxiliary support chassis 32 on the outer shell 3 in the above manner, thereby achieving the change of the installation height of the auxiliary support chassis 32. This method is simple, fast, and highly operable, and greatly improves the efficiency of the height adjustment of the auxiliary support chassis 32.

[0047] It is worth mentioning that after the processing of the curved thin-walled part is completed, the electromagnetic coil 51 on the outer shell 3 is powered off, which will cause the magnetorheological fluid 100 to return to liquid state. At this time, the magnetorheological fluid 100 in the space of the outer shell 3 needs to be discharged outward. Referring to the prior art, it can be known that the tiny magnetic particles inside the magnetorheological fluid 100 have the property of reversible arrangement, so it can repeatedly produce phase changes, so that it can be used multiple times. In order to facilitate the collection of the magnetorheological fluid 100, in this embodiment, the rotating seat 12 has a liquid recovery groove 122 connected to an externally arranged collection tank (not shown in the figure) and the space inside the outer shell 3. The staff pulls the outer shell 3 out of the mounting support 2 until the annular groove 33 where the auxiliary support chassis 32 is located is exposed to the external environment, and then slowly pulls the auxiliary support chassis 32 outward for a certain length, so that the magnetorheological fluid 100 can continue to flow downward from the gap generated between the auxiliary support chassis 32 and the inner wall of the outer shell 3, and flow into the collection tank through the above-mentioned liquid recovery groove 122, so as to complete the collection, recovery and reuse of the magnetorheological fluid 100.

[0048] Optionally, in this embodiment, a plurality of magnetic sliders 34 are slidably arranged in the annular groove 33, and the magnetic sliders 34 are connected to the suction cup assembly 4. The magnetic sliders 34 in this embodiment are arranged in the annular groove 33 with an annular sealing cover installed to prevent the magnetic sliders 34 from falling. After the electromagnetic coil 51 in the outer shell 3 is energized, the magnetic sliders 34 can be driven to slide in the annular groove 33, so that the suction cup assembly 4 can rotate circumferentially in the space through the magnetic sliders 34, so that the suction cup assembly 4 can clamp and support the curved thin-walled part at the most suitable position, thereby effectively improving the operability, clamping accuracy and flexibility of the fixture.

[0049] The specific structure of the suction cup assembly 4 provided in this embodiment is described in detail below. Figures 5 to 8 As shown, the suction cup assembly 4 includes a hemispherical joint 41, a telescopic part 42, a suction cup part 43 and a pressure sensor 44. In this embodiment, the magnetic slider 34 is provided with a first hemispherical groove 341, and the hemispherical joint 41 is rotatably connected in the first hemispherical groove 341; the telescopic part 42 is connected to the hemispherical joint 41, and the output end of the telescopic part 42 is transmission-connected to the suction cup part 43 to drive the suction cup part 43 to perform circumferential motion; the suction cup part 43 includes a mounting frame 431 and a suction cup shaft 432, the mounting frame 431 is transmission-connected to the telescopic part 42, and a second hemispherical groove is provided on the mounting frame 431, one end of the suction cup shaft 432 is a hemispherical structure, and the hemispherical structure is rotatably embedded in the second hemispherical groove, the other end of the suction cup shaft 432 is fixedly provided with a suction cup 433, and the pressure sensor 44 is provided on the suction cup 433.

[0050] For example, the following process is the specific operation steps of the fixture:

[0051] First, the magnetorheological fluid 100 is poured into the space of the outer shell 3 along the liquid guiding groove 31 , and supported by the auxiliary supporting chassis 32 .

[0052] Secondly, according to the facade shape of the curved thin-walled part, the number of suction cup assemblies 4 to be used is selected, and then the staff can manually rotate the hemispherical joint 41 in the selected suction cup assembly 4 in the first hemispherical groove 341 to achieve large-angle coarse adjustment of multiple suction cup assemblies 4.

[0053] Next, the curved thin-walled part is placed in the space of the outer shell 3, so that the magnetorheological fluid 100 is wrapped on the processing opposite surface of the curved thin-walled part, and then the multiple telescopic parts 42 are driven by the control system, so that the telescopic parts 42 bring the suction cup parts 43 gradually approach the outer surface of the curved thin-walled part along the axial direction, and at the same time, the suction cups 433 on the suction cup shaft 432 can be adaptively rotated at a micro angle according to the appearance characteristics of the curved thin-walled part, so that the suction cups 433 in the multiple suction cup assemblies 4 can all be tightly connected to the outer surface of the curved thin-walled part. Preferably, three suction cups 433 are arranged in series on the suction cup shaft 432 to enhance the adsorption effect on the curved thin-walled part.

[0054] Finally, the control system monitors the pressure sensor on the suction cup 433, accurately controls the clamping force of the multiple suction cup parts 43 on the curved thin-walled parts, and energizes the electromagnetic coil 51 on the outer shell 3 to make the magnetorheological fluid 100 phase change and solidify, so as to provide auxiliary support for the curved thin-walled parts and make up for the lack of clamping support of the suction cup assembly 4.

[0055] Compared with the existing magnetorheological clamp device, the clamp tooling provided in this embodiment achieves the purpose of clamping curved thin-walled parts with simple or complex facade shapes through the large-angle coarse adjustment of the suction cup assembly 4 and the small-angle fine adjustment of the suction cup shaft 432, combined with the auxiliary support of the magnetorheological fluid 100, thereby effectively improving the application scope of the clamp tooling. At the same time, through the monitoring of the control system, the clamping accuracy of the clamp tooling is ensured, overcoming the defect of the narrow application scope of the existing magnetorheological clamp device.

[0056] Specifically, in this embodiment, refer to Figure 6 As shown, the telescopic part 42 includes a suction cup motor 421, a fixing plate 422, a coupling 423, a ball screw 424 and a telescopic shaft 425. The suction cup motor 421 is electrically connected to the control system and is arranged in the hemispherical joint 41. The fixing plate 422 is limitedly embedded in the hemispherical joint 41. The coupling 423 passes through the fixing plate 422 and is connected to the ball screw 424 in a transmission manner. The telescopic shaft 425 has an internal threaded hole. One end of the ball screw 424 away from the suction cup motor 421 is threadedly connected to the internal threaded hole. Figure 7As shown, the mounting frame 431 has a telescopic through hole 4311, and an axial side slot 4312 is provided on the side wall of the telescopic through hole 4311. After the telescopic shaft 425 is limitedly inserted into the telescopic through hole 4311, the telescopic shaft 425 can be clamped on the mounting frame 431 through the axial side slot 4312 by fasteners such as a pin shaft, which is not only convenient to connect and has strong operational feasibility, but also convenient for disassembly, replacement, maintenance and maintenance of the mounting frame 431 and the telescopic shaft 425. The control system controls the mounting frame 431 to move axially by controlling the suction cup motor 421, so as to accurately and reliably control the clamping force of the telescopic part 42 on the curved thin-walled part, thereby further improving the flexibility and operability of the fixture.

[0057] Specifically, in order to facilitate the staff to disassemble and replace the suction cup 433 on the suction cup shaft 432, as shown in FIG. Figure 8 As shown, the suction cup shaft 432 provided in this embodiment includes a first shaft body 4321, a second shaft body 4322 and a connecting piece 4323. A section of the first shaft body 4321 is the above-mentioned hemispherical structure. The other end of the first shaft body 4321 is detachably connected to the second shaft body 4322 through the connecting piece 4323 (for example, the other end of the first shaft body 4321 and the second shaft body 4322 are both provided with external threads, and the connecting piece 4323 uses a nut, and the two ends of the nut are respectively threadedly connected to the other end of the first shaft body 4321 and the second shaft body 4322), and the suction cup 433 is fixedly arranged on the second shaft body 4322. Therefore, the staff only needs to unscrew the second shaft body 4322 from the nut to check the suction cup 433 on the second shaft body 4322 to ensure the safety and performance of the suction cup 433.

[0058] Optionally, in this embodiment, combined with Figure 7 and Figure 8As shown, the cross section of the mounting frame 431 is triangular, and each corner of the mounting frame 431 is provided with the above-mentioned second hemispherical groove, and each second hemispherical groove is rotatably connected with a suction cup shaft 432, and an electromagnetic coil 51 is arranged in the second shaft body 4322. The purpose of such arrangement is that since the tripod is provided with a triangular lattice suction cup part 43, when the control system energizes the electromagnetic coil 51 located in the second shaft body 4322, an electromagnetic field can be generated in the triangular area formed by the three suction cup parts 43, so as to further improve the solidification degree of the magnetorheological fluid 100 in the area, and the stability of the triangle can be used to further improve the support stiffness of the suction cup assembly 4 for the curved thin-walled part. In addition, the magnetorheological fluid 100 near the suction cup portion 43 can greatly shorten the time required for the solidification phase change compared to the magnetorheological fluid 100 in other positions, so as to stably clamp the curved thin-walled parts before all the magnetorheological fluids 100 in the space undergo the solidification phase change, thereby significantly reducing the probability of the magnetorheological fluid 100 in other positions squeezing and deflecting the fixed position of the curved thin-walled parts after solidification.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fixture for machining curved thin-walled parts, characterized in that: It comprises an outer shell (3), a suction cup assembly (4) and a control system, wherein: The outer shell (3) has a space for placing the curved thin-walled component and the magnetorheological fluid (100), a plurality of suction cup assemblies (4) are respectively arranged in the circumferential direction and the vertical direction on the inner side wall of the outer shell (3), and a first hemispherical groove (341) is provided on the outer shell (3); The suction cup assembly (4) comprises a hemispherical joint (41), a telescopic portion (42), a suction cup portion (43) and a pressure sensor (44); the hemispherical joint (41) is rotatably disposed in the first hemispherical groove (341); the telescopic portion (42) is connected to the hemispherical joint (41); and the output end of the telescopic portion (42) is transmission-connected to the suction cup portion (43) to drive the suction cup portion (43) to perform axial movement. The device comprises a mounting frame (431) and a suction cup shaft (432), wherein the mounting frame (431) is transmission-connected to the telescopic portion (42), and the mounting frame (431) is provided with a second hemispherical groove, one end of the suction cup shaft (432) is a hemispherical structure, and the hemispherical structure is rotatably embedded in the second hemispherical groove, and the other end of the suction cup shaft (432) is fixedly provided with a suction cup (433), and the pressure sensor (44) is provided on the suction cup (433); The control system is drive-connected to the telescopic part (42) and signal-connected to the pressure sensor (44). The control system comprises an electromagnetic coil (51), and the outer shell (3) is provided with the electromagnetic coil (51).

2. The fixture for machining curved thin-walled parts according to claim 1, characterized in that: The suction cup shaft (432) includes a first shaft (4321), a second shaft (4322) and a connecting piece (4323), one end of the first shaft (4321) is the hemispherical structure, the other end of the first shaft (4321) is detachably connected to the second shaft (4322) via the connecting piece (4323), and the suction cup (433) is fixed on the second shaft (4322).

3. The fixture for processing curved thin-walled parts according to claim 2, characterized in that: The cross section of the mounting frame (431) is triangular, and each corner of the mounting frame (431) is provided with a second hemispherical groove, each of the second hemispherical grooves is rotatably connected to a suction cup shaft (432), and the electromagnetic coil (51) is arranged in the second shaft body (4322).

4. The fixture for machining curved thin-walled parts according to claim 1, characterized in that: The outer shell (3) is an inverted truncated cone structure.

5. The fixture for machining curved thin-walled parts according to claim 1, characterized in that: The inner side wall of the outer shell (3) has a plurality of annular grooves (33) along the vertical direction, and the electromagnetic coil (51) is arranged in the annular groove (33); the outer shell (3) is also provided with a plurality of magnetic sliders (34), and the magnetic sliders (34) are slidably arranged in the annular grooves (33), and the first hemispherical groove (341) is opened on the magnetic sliders (34).

6. The fixture for machining curved thin-walled parts according to claim 5, characterized in that: The invention also comprises a belt transmission structure (13) and a rotating seat (12), wherein the belt transmission structure (13) comprises a driving motor (131), a driving wheel (132), a driven wheel (133), a belt (134), a transmission shaft (135) and a supporting base column (136), wherein the control system is electrically connected to the driving motor (131), the output shaft of the driving motor (131) is drivingly connected to the driving wheel (132), the driving wheel (132) is drivingly connected to the driven wheel (133) through the belt (134), the driven wheel (133) is sleeved on the transmission shaft (135), one end of the transmission shaft (135) is rotatably connected to the supporting base column (136), the other end of the transmission shaft (135) is drivingly connected to the rotating seat (12), the supporting base column (136) is fixedly arranged, and the rotating seat (12) is drivingly connected to the outer shell (3).

7. The fixture for machining curved thin-walled parts according to claim 6, characterized in that: The belt transmission structure (13) further comprises a transmission support assembly (137), wherein the transmission support assembly (137) comprises a transmission support wheel (1373), wherein the transmission support wheel (1373) is rotatably fixed along its own axis and is pressed and connected to the belt (134).

8. The fixture for machining curved thin-walled parts according to claim 6, characterized in that: An auxiliary support chassis (32) is horizontally arranged in the space, the outer side wall of the auxiliary support chassis (32) is sealingly connected to the inner side wall of the outer shell (3), the magnetorheological fluid (100) is arranged on the upper surface of the auxiliary support chassis (32), and the auxiliary support chassis (32) is movably arranged in the space along the vertical direction.

9. The fixture for machining curved thin-walled parts according to claim 8, characterized in that: An annular sealing cover is detachably provided on the outer shell (3), and the annular sealing cover is configured to form the bottom of the annular groove (33). When the annular sealing cover is separated from the outer shell (3), the auxiliary support chassis (32) can pass through the annular groove (33) and be horizontally arranged in the space.

10. The fixture for machining curved thin-walled parts according to claim 9, characterized in that: It also includes a collection tank, the rotating seat (12) having a liquid recovery groove (122) connecting the collection tank and the space, and the magnetorheological fluid (100) in the space can flow into the collection tank through the liquid recovery groove (122).

Images