Rivet welding repair and ultrasonic combined machining device and method for large-diameter thin-wall ring piece

Abstract

The invention discloses a rivet welding repair and ultrasonic combined machining device and method for a large-diameter thin-wall ring piece. Rivet welding comprises the steps that an existing ring piece is connected to the end face of an existing thin-wall ring piece in a welded mode so as to form a to-be-machined thin-wall ring piece in a combined mode; the thin-wall ring piece to be machined is machined; the ultrasonic combined machining comprises the following steps: clamping and positioning; turning: turning the inner ring surface of the existing thin-wall ring piece and the outer circular surface of the existing ring piece in the thin-wall ring piece to be machined by starting the ultrasonic machining equipment; and end face finishing is conducted, specifically, the machining tool is replaced, the ultrasonic machining equipment is restarted to conduct grinding machining on the end face of the existing thin-wall ring piece and the outer circle face of the existing ring piece. According to the method, the welding amount of traditional rivet welding repair can be reduced, welding deformation and subsequent part machining deformation can be reduced, deformation, caused by cutting resistance, of a workpiece in the machining process can be reduced, the cutting speed is increased, then the machining efficiency is improved, meanwhile, the smoothness of the surface of the workpiece can be improved, and the service life of a cutter is also remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of processing large-diameter thin-walled ring parts, and in particular, to a riveting and welding repair method for large-diameter thin-walled ring parts. In addition, the present invention also relates to an ultrasonic composite machining device and a machining method for large-diameter thin-walled ring parts processed by using the large-diameter thin-walled ring parts repaired by the riveting and welding repair method. Background Technique

[0002] With the substantial increase in market equipment, the field of shield machine remanufacturing has become a popular research field. It includes steps such as disassembly and inspection, cleaning and repair, technical upgrading, and reassembly and testing of shield machines. Through these operations, the performance of used shield machine components can be repaired, upgraded, and transformed, which can restore or improve performance, greatly reduce equipment costs, extend the service life of equipment, and conform to the concepts of green manufacturing and sustainable manufacturing.

[0003] In the field of shield machines, for newly manufactured thin-walled ring parts, due to their large diameter (outer diameter greater than 1000 mm) and thin wall (the ratio of outer diameter to inner diameter is less than 1.2), it is difficult to control the welding and machining deformation of the workpiece, and it is very difficult to ensure the geometric tolerance. Moreover, for the repaired and machined thin-walled ring parts that have been used, the difficulty is even greater.

[0004] Existing patent one CN112338543A, a ring part processing system and a processing method for ring parts, provides a ring part processing system and a processing method for ring parts. Among them, the ring part processing system includes: a processing device, the processing device includes a workbench and a base component, the base component can be placed on the workbench, the base component includes a main body, the main body is of a ring structure, the main body is used to support the ring part, and based on the situation of the main body supporting the ring part, the inner wall surface of the main body fits with the outer wall surface of the ring part. However, its processing efficiency for large-diameter thin-walled ring parts is low, the deformation control of the workpiece is poor, and the tool consumption is large.

[0005] Existing patent two CN221474779U, a thin-walled ring part processing tooling, includes a base and a clamping device, the clamping device is arranged on the surface of the base, the clamping device includes a slide bar, the inner wall of the base is provided with an air cavity and a plurality of slide cavities, the plurality of slide cavities are communicated with the air cavity, the inner wall of the slide cavity is provided with a slide hole, the slide bar is slidably connected with the inner wall of the slide hole, one end of the slide bar is fixedly connected with a sealing ring, the sealing ring is slidably connected with the inner wall of the slide cavity, and one end of the slide bar is fixedly connected with a moving block. Although this device can achieve flexible clamping to a certain extent, there is no pressing device at the end face during the processing of large-diameter ring parts, which is likely to cause unstable geometric tolerance, thereby affecting the quality of the workpiece. Moreover, when the diameter of the thin-walled ring part is too large, the number of flexible mechanisms in this device cannot be adjusted, which is not conducive to clamping and alignment.

[0006] Existing patent three CN11857814A, a compound ultrasonic machining device, includes an ultrasonic oscillator, a cutting tool and an impact head disposed on the ultrasonic oscillator. The ultrasonic oscillator is used to generate ultrasonic vibrations and transmit the ultrasonic vibrations with changed amplitudes to the cutting tool and the impact head. The cutting tool is used for ultrasonic cutting machining of a workpiece, and the impact head is used for ultrasonic impact strengthening of a machining surface. This technical solution does not give a specific application scenario, and it combines ultrasonic cutting and ultrasonic surface strengthening in one process, which is unreasonable in actual machining. Moreover, due to this structural design, the machining range of ultrasonic cutting or ultrasonic surface strengthening is limited.

[0007] In the existing conventional technology, considering its characteristics of large diameter and easy deformation, large-diameter thin-walled ring parts are generally rarely repaired. Generally, if the dimensions are out of tolerance and cannot be used, the method of surfacing and then machining with a vertical lathe is required. The disadvantages of this solution are as follows:

[0008] 1. Surfacing large-diameter thin-walled ring parts results in out-of-tolerance form and position dimensions of the workpiece, unable to meet the technical requirements;

[0009] 2. When machining large-diameter thin-walled ring parts, the surfacing position is prone to cracking and cannot meet the performance requirements;

[0010] 3. When machining large-diameter thin-walled ring parts, it is difficult to achieve the required surface finish or it is time-consuming and laborious to meet the requirements. Summary of the Invention

[0011] The present invention provides a riveting and welding repair and ultrasonic composite machining device and method for large-diameter thin-walled ring parts to solve the technical problem that existing large-diameter thin-walled ring parts are difficult to be reused after reprocessing.

[0012] The technical solution adopted by the present invention is as follows:

[0013] A method for riveting and welding repair of large-diameter thin-walled ring parts includes the steps of: welding and connecting an existing ring part on the end face of an existing thin-walled ring part to form a thin-walled ring part to be machined; machining the thin-walled ring part to be machined to form a new formed thin-walled ring part.

[0014] Further, the step of "welding and connecting an existing ring part on the end face of an existing thin-walled ring part" specifically includes the following steps: spot-welding the existing thin-walled ring part to a riveting and welding fixture; positioning the existing ring part relative to the existing thin-walled ring part so that the two are parallel and spaced 2 - 4 mm apart; circumferentially welding and fixedly connecting the existing ring part and the existing thin-walled ring part.

[0015] According to another aspect of the present invention, there is also provided an ultrasonic composite machining device for large-diameter thin-walled ring parts, which is used for clamping and positioning the thin-walled ring part to be machined in the riveting and welding repair method for large-diameter thin-walled ring parts as described in any one of the above. The ultrasonic composite machining device includes: multiple groups of angle support components, multiple groups of support components, and multiple groups of pressing plate components, which are connected to the workbench of the ultrasonic machining equipment. The multiple groups of angle support components, multiple groups of support components, and multiple groups of pressing plate components are sequentially arranged at intervals along the circumferential direction of the workbench; the multiple groups of support components are used to cooperate to support the thin-walled ring part to be machined; the angle support components are used to abut against the inner ring surface or the outer ring surface of the thin-walled ring part to be machined to limit the thin-walled ring part to be machined in the radial direction; the pressing plate components are used to press the thin-walled ring part to be machined downward onto the multiple groups of support components.

[0016] Further, the support component includes a support main body that is vertically telescopic, and a first fastener that penetrates and connects the support main body. The thin-walled ring part to be machined is supported on the top end of the support main body, and the first fastener is used to be fixed to the T-shaped groove provided at the corresponding position on the workbench; the angle support component includes a limit seat for abutting against the inner ring surface or the outer ring surface of the thin-walled ring part to be machined for limiting, and a second fastener that penetrates and connects the limit seat. The limit seat is supported on the workbench, and the second fastener is used to be fixed to the T-shaped groove provided at the corresponding position on the workbench.

[0017] Further, the pressing plate component includes a mounting post, a pressing plate hinged to the top end of the mounting post, and a tensioning member that penetrates the pressing plate; the mounting post is vertically supported on the workbench, and its bottom end is slidably connected to the T-shaped groove provided at the corresponding position on the workbench through an outwardly protruding T-shaped bolt; the upper end of the tensioning member is connected to the pressing plate, and the lower end of the tensioning member is used to be connected to the T-shaped groove provided at the corresponding position on the workbench to relatively tension the pressing plate and the workbench under an external force, so as to press the thin-walled ring part supported on the top end of the support component by the pressing plate.

[0018] According to another aspect of the present invention, there is also provided an ultrasonic composite machining method for large-diameter thin-walled ring parts, which is used for performing composite machining on the thin-walled ring part to be machined as described in any one of the above by using an ultrasonic machining equipment and the ultrasonic composite machining device for large-diameter thin-walled ring parts as described in any one of the above. The method includes the following steps: clamping and positioning: positioning and clamping the thin-walled ring part to be machined on the ultrasonic composite machining device; turning machining: starting the ultrasonic machining equipment to perform turning machining on the inner ring surface of the existing thin-walled ring part and the outer circle surface of the existing ring part in the thin-walled ring part to be machined; end face finishing: replacing the machining tool and restarting the ultrasonic machining equipment to perform grinding machining on the end face of the existing thin-walled ring part and the outer circle surface of the existing ring part.

[0019] Further, the inner circle of the existing thin-walled ring includes a first end-face inner circle, an intermediate groove, and a second end-face inner circle arranged in sequence along the axial direction, and the second end-face inner circle is close to the existing annular part. The step of "turning machining" specifically includes the following steps: rough machining of the inner circle surface: rough machining the second end-face inner circle of the existing thin-walled ring to make the inner diameter of the second end-face inner circle after machining close to the inner diameter of the intermediate groove; machining of the existing annular part: machining the outer circle surface of the existing annular part to form two inclined inner bevel circles and outer bevel circles that are coaxially arranged inside and outside on the existing annular part after machining; finish machining of the inner circle surface: finish machining the second end-face inner circle after rough machining to make the inner diameter of the second end-face inner circle equal to the inner diameter of the intermediate groove.

[0020] Further, when performing the step of "rough machining of the inner circle surface", the angle support assembly and the pressing plate assembly in the ultrasonic composite machining device are used to radially inwardly tighten and vertically press the corresponding part of the thin-walled ring to be machined from the outside; in the step of "machining the existing annular part", when machining the inner bevel circle, the angle support assembly and the pressing plate assembly in the ultrasonic composite machining device are used to radially inwardly tighten and vertically press the corresponding part of the thin-walled ring to be machined from the outside; when machining the outer bevel circle, the angle support assembly and the pressing plate assembly in the ultrasonic composite machining device are used to radially outwardly tighten and vertically press the corresponding part of the thin-walled ring to be machined from the inside; when performing the step of "finish machining of the inner circle surface", the angle support assembly and the pressing plate assembly in the ultrasonic composite machining device are used to radially inwardly tighten and vertically press the corresponding part of the thin-walled ring to be machined from the outside.

[0021] Further, the step of "end-face finishing" specifically includes: finishing the second end face of the existing thin-walled ring connecting the existing annular part, and finishing the outer circle surface of the existing annular part to form an outer end face parallel to the second end face of the existing thin-walled ring on the existing annular part.

[0022] Further, the ultrasonic machining equipment further includes a vertical bed body, a cross beam, a walking platform, an operation panel, a ram connected to the vertical bed body, an operation table connected to the workbench, and a tool mounting seat connected to the bottom end of the ram; the turning tool handle for performing the step of "turning machining" includes a first transducer detachably connected to the tool mounting seat, a first amplitude transformer connected to the first transducer, and a machining blade connected to the end of the first amplitude transformer; the finishing tool handle for performing the step of "finishing machining" includes a second transducer detachably connected to the tool mounting seat, a second amplitude transformer connected to the second transducer, and a finishing ball head connected to the end of the second amplitude transformer.

[0023] The present invention has the following beneficial effects:

[0024] The riveting and welding repair method of the present invention is used to weld and combine two existing parts with different usage positions and usage methods, that is, to weld and combine an existing thin-walled ring and an existing ring to form a thin-walled ring to be processed with new uses and new functions. Furthermore, it not only realizes the recycling and reuse of existing parts, greatly reducing production and preparation costs, but also increases the existing ring through welding, which can improve the structural strength and stiffness of large-diameter and thin-walled rings, and then greatly improves their reprocessing performance, reducing subsequent machining deformation and weld cracking;

[0025] In the ultrasonic composite machining device of the present invention, multiple sets of support components can cooperate to stably support the thin-walled ring to be processed. At the same time, multiple sets of angular support components are used to abut against the inner ring surface and outer ring surface of the thin-walled ring to be processed, thereby limiting the thin-walled ring to be processed radially. At the same time, multiple sets of pressing plate components are also used to stably press the thin-walled ring to be processed onto multiple sets of support components, so as to realize the stable clamping and positioning of the thin-walled ring to be processed, improving its machining stability and machining quality; on the other hand, through cooperation with the ultrasonic machining equipment, for the machining of large-diameter thin-walled rings, it can reduce the deformation of the workpiece caused by cutting resistance during the machining process, increase the cutting speed, thereby improving the machining efficiency. At the same time, it can improve the surface finish of the workpiece, thereby improving the machining quality, and the tool life is also significantly improved;

[0026] The present invention provides a riveting and welding repair and ultrasonic composite machining device and machining method for large-diameter thin-walled rings, which successively complete the riveting and welding repair of large-diameter thin-walled rings, the positioning and clamping of the thin-walled ring to be processed, ultrasonic composite turning machining and surface finishing work; among them, adopting the riveting and welding repair method of the present invention can reduce the welding amount of traditional riveting and welding repair, reduce welding deformation and subsequent part machining deformation, and the problem of post-weld machining cracking. Adopting the ultrasonic composite machining device and machining method of the present invention for the machining and positioning of large-diameter thin-walled rings can reduce the deformation of the workpiece caused by cutting resistance during the machining process, increase the cutting speed, thereby improving the machining efficiency. At the same time, it can improve the surface finish of the workpiece, and the tool life is also significantly improved.

[0027] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings to further elaborate on the present invention in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 It is a schematic cross-sectional front view structure diagram of the thin-walled ring to be processed in a preferred embodiment of the present invention;

[0030] Figure 2 is the front view structural schematic diagram of the formed thin-walled ring in the preferred embodiment of the present invention;

[0031] Figure 3 is Figure 2 the A-A cross-sectional structural schematic diagram of;

[0032] Figure 4 is the machining state schematic diagram of turning the thin-walled ring to be machined by using an ultrasonic machining device;

[0033] Figure 5 is Figure 4 the partial enlarged structural schematic diagram of;

[0034] Figure 6 is the spatial structural schematic diagram of the angle support component in the preferred embodiment of the present invention;

[0035] Figure 7 is the spatial structural schematic diagram of the pressing plate component in the preferred embodiment of the present invention;

[0036] Figure 8 is Figure 4 the structural schematic diagram of the turning tool holder connecting the tool mounting seat in;

[0037] Figure 9 is Figure 8 the spatial structural schematic diagram of the turning tool holder in;

[0038] Figure 10 is the machining state schematic diagram of finish turning the end face of the thin-walled ring to be machined by using an ultrasonic machining device;

[0039] Figure 11 is Figure 10 the partial enlarged structural schematic diagram of;

[0040] Figure 12 is Figure 10 the structural schematic diagram of the finishing tool holder connecting the tool mounting seat in;

[0041] Figure 13 is Figure 12 the spatial structural schematic diagram of the finishing tool holder in;

[0042] Figure 14 is the forming flow chart of the formed thin-walled ring.

[0043] Legend:

[0044] 1. Existing thin-walled ring; 101. First end face inner circle; 102. Intermediate groove; 103. Second end face inner circle;

[0045] 2. Existing ring; 201. Inner bevel circle; 202. Outer bevel circle; 203. Outer end face;

[0046] 3. Thin-walled ring to be processed; 4. Formed thin-walled ring

[0047] 5. Ultrasonic processing equipment; 51. Workbench; 52. Vertical bed; 56. Ram; 58. Tool mounting seat

[0048] 6. Angular support assembly; 61. Limit seat; 62. Second fastener

[0049] 7. Support assembly

[0050] 8. Press plate assembly; 81. Mounting post; 82. Press plate; 83. Tensioning member

[0051] 91. Turning tool holder; 911. First transducer; 912. First horn; 913. Machining blade; 93. Finishing tool holder; 931. Second transducer; 932. Second horn; 933. Finishing ball head Detailed implementation manners

[0052] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0053] Refer to Figures 1-3 , the preferred embodiment of the present invention provides a method for riveting and welding repair of large-diameter thin-walled ring parts, including the steps of:

[0054] S10: Weld and connect the existing ring part 2 to the end face of the existing thin-walled ring part 1 to form a thin-walled ring part 3 to be processed by combination.

[0055] S20: Process the thin-walled ring part 3 to be processed to form a new formed thin-walled ring part 4.

[0056] The riveting and welding repair method of the present invention is used to weld and combine two existing parts with different usage positions and usage methods, that is, weld and combine the existing thin-walled ring part 1 and the existing ring part 2 to form a thin-walled ring part 3 to be processed with new uses and new functions. Furthermore, not only the recycling and reuse of existing parts are realized, which greatly reduces the production and preparation costs, but also by welding the existing ring part 2, the structural strength and stiffness of the large-diameter thin-walled ring part can be improved, thereby greatly improving its reprocessing performance and reducing subsequent machining deformation and weld cracking.

[0057] Optionally, the step "S10: Weld and connect the existing ring part 2 to the end face of the existing thin-walled ring part 1" specifically includes the following steps:

[0058] S101: Spot-weld the existing thin-walled ring 1 to the riveting fixture; in actual operation, spot-weld the existing thin-walled ring 1 to a riveting fixture with a diameter slightly larger than its own diameter to make it firm for subsequent welding connection with the existing ring 2.

[0059] S102: Position the existing ring 2 relative to the existing thin-walled ring 1 so that the two are parallel and spaced 2 - 4 mm apart; in actual operation, the existing ring 2 to be welded, generally a ring-shaped round steel, is lifted as a whole by 2 - 4 mm through a spacer block so that there is a spacing between the existing thin-walled ring 1 and the existing ring 2, and then the fillet weld can be completely penetrated during subsequent welding to improve the welding connection quality between the two.

[0060] S103: Weld and fixedly connect the existing ring 2 and the existing thin-walled ring 1 in a circumferential fillet weld. In actual operation, manual argon arc welding is used. According to the principle of symmetric welding, after leveling the existing thin-walled ring 1 as required by the drawing, welding is carried out on its upper surface. When welding, the ring-shaped round steel is lifted by 2 - 4 mm to ensure that the fillet weld can be completely penetrated; then the existing thin-walled ring 1 and the ring-shaped round steel are riveted, and the riveting gap is 2 - 4 mm; when welding, segmented welding is adopted, with each segment having a length of 30 - 60 mm and a spacing of 30 - 60 mm, and the inner and outer rings need to be staggered during welding to minimize welding deformation to the greatest extent.

[0061] Refer to Figures 4-5 、 Figures 10-11 Furthermore, a large-diameter thin-walled ring ultrasonic composite machining device is provided in a preferred embodiment of the present invention for clamping and positioning the thin-walled ring 3 to be processed in the large-diameter thin-walled ring riveting and repair method as described in any one of the above. The ultrasonic composite machining device includes: a plurality of sets of angle support components 6, a plurality of sets of support components 7, and a plurality of sets of pressing plate components 8 that are connected to the workbench 51 of the ultrasonic machining device 5. The plurality of sets of angle support components 6, the plurality of sets of support components 7, and the plurality of sets of pressing plate components 8 are sequentially arranged at intervals along the circumferential direction of the workbench 51; the plurality of sets of support components 7 are used to cooperate to support the thin-walled ring 3 to be processed; the angle support components 6 are used to abut against the inner ring surface or the outer ring surface of the thin-walled ring 3 to limit the thin-walled ring 3 to be processed in the radial direction; the pressing plate components 8 are used to press the thin-walled ring 3 downward onto the plurality of sets of support components 7.

[0062] In the ultrasonic composite machining device of the present invention, multiple sets of supporting components 7 can cooperate to stably support the thin-walled ring workpiece 3 to be machined. At the same time, multiple sets of angular support components 6 are used to abut against the inner ring surface and the outer ring surface of the thin-walled ring workpiece 3 to be machined, thereby limiting the thin-walled ring workpiece 3 to be machined radially. At the same time, multiple sets of pressing plate components 8 are used to stably press the thin-walled ring workpiece 3 to be machined onto the multiple sets of supporting components 7, so as to realize the stable clamping and positioning of the thin-walled ring workpiece 3 to be machined, improve its machining stability and machining quality; on the other hand, through the cooperation with the ultrasonic machining equipment 5, for the machining of large-diameter thin-walled ring workpieces, the deformation of the workpiece caused by cutting resistance during the machining process can be reduced, the cutting speed can be increased, and thus the machining efficiency can be improved. At the same time, the surface finish of the workpiece can be improved, thereby improving the machining quality, and the tool life is also significantly improved.

[0063] Optionally, as Figure 5 and Figure 11 shown, the supporting component 7 includes a vertically telescopic supporting body and a first fastener passing through and connecting the supporting body. The thin-walled ring workpiece 3 to be machined is supported on the top end of the supporting body, and the first fastener is used to be fixed to the T-shaped groove provided at the corresponding position on the workbench 51; the first fastener is generally a connecting bolt to be detachably connected to the workbench 51, so as to adapt to the supporting requirements of workpieces with different outer diameters. As Figure 6 shown, the angular support component 6 includes a limit seat 61 for abutting against the inner ring surface or the outer ring surface of the thin-walled ring workpiece 3 to be machined for limiting, and a second fastener 62 passing through and connecting the limit seat 61. The limit seat 61 is supported on the workbench 51, and the second fastener 62 is used to be fixed to the T-shaped groove provided at the corresponding position on the workbench 51; the second fastener is a connecting bolt to be adjustably fixedly connected to the T-shaped groove on the workbench 51, so as to not only adapt to the abutting and limiting requirements of workpieces with different outer diameters, but also be able to rotate the direction to abut against the workpiece for limiting from the outside or the inside of the workpiece, improving its adaptability range and usage flexibility.

[0064] Optionally, as Figure 7 shown, the pressing plate component 8 includes a mounting post 81, a pressing plate 82 hinged to the top end of the mounting post 81, and a tensioning member 83 passing through the pressing plate 82; the mounting post 81 is vertically supported on the workbench 51, and its bottom end is slidably connected to the T-shaped groove at the corresponding position on the workbench 51 through an outwardly protruding T-shaped bolt; the upper end of the tensioning member 83 is connected to the pressing plate 82, and the lower end of the tensioning member 83 is used to be connected to the T-shaped groove provided at the corresponding position on the workbench 51 to be used to relatively tension the pressing plate 82 and the workbench 51 under an external force, so as to make the pressing plate 82 press the thin-walled ring workpiece 3 supported on the top end of the supporting component 7.

[0065] In this alternative solution, the tension member 83 includes a T-shaped screw rod and a fastening nut that cooperates therewith. The lower end of the T-shaped screw rod is movably connected to the T-shaped groove on the workbench 51, and its upper end passes through the pressing plate 82 and then connects to the fastening nut. By tightening the fastening nut, the pressing plate 82 can be forced to press down on the thin-walled ring workpiece 3 to be processed, so the operation is simple. At the same time, through the adjustable connection between the T-shaped screw rod and the workbench 51, it not only meets the pressing and limiting requirements of workpieces with different outer diameters, but also can be rotated to press down the workpiece for limiting from the outside or inside of the workpiece, thereby improving its adaptability range and use flexibility. In another embodiment, the tension member 83 includes two threaded cylinders with internal threads arranged at intervals relative to each other, and a screw rod connecting the two threaded cylinders. The bottom end of one threaded cylinder is in fit connection with the T-shaped groove, and the top end of the other threaded cylinder is fixedly connected to the pressing plate 82. The screw rod is screwed between the two threaded cylinders, so that by rotating the screw rod, the two threaded cylinders can be relatively close to or relatively far from each other, that is, the upper threaded cylinder pulls down the pressing plate 82.

[0066] Preferably, multiple groups of supporting components 7, multiple groups of angle support components 6, and multiple groups of pressing plate components 8 are respectively arranged at uniform intervals along the circumferential direction to balance the circumferential force of the thin-walled ring workpiece 3 to be processed.

[0067] Referring to Figures 4-13 , a preferred embodiment of the present invention further provides a large-diameter thin-walled ring ultrasonic composite machining method, which is used to perform composite machining on the thin-walled ring workpiece 3 to be processed as described above by using an ultrasonic machining device 5 and a large-diameter thin-walled ring ultrasonic composite machining device as described in any one of the above, including the following steps:

[0068] B10: Clamping and positioning: Position and clamp the thin-walled ring workpiece 3 to be processed on the ultrasonic composite machining device;

[0069] B20: Turning machining: Start the ultrasonic machining device 5 to perform turning machining on the inner ring surface of the existing thin-walled ring 1 and the outer circular surface of the existing annular part 2 in the thin-walled ring workpiece 3 to be processed;

[0070] B30: End face finishing: Replace the machining tool and restart the ultrasonic machining device 5 to perform grinding machining on the end face of the existing thin-walled ring 1 and the outer circular surface of the existing annular part 2.

[0071] In the present invention, initially, the existing thin-walled ring 1 to be repaired by riveting and welding is fixed on the riveting and welding platform. A process block is used to restrict the position of the existing thin-walled ring 1 in the circumferential direction, and the upper surface of the existing thin-walled ring 1 is leveled by a tooling (to maintain the best flatness, so as to ensure uniform welding and machining allowance in the subsequent process); then, the existing ring-shaped part 2 (round steel) is prepared. Before welding, the round steel is lifted by 3 mm as a whole, so that both side fillet welds can be fully penetrated, and there are welds left locally during subsequent turning; during welding, considering the characteristics of poor rigidity and easy deformation of the workpiece, appropriate current parameters and fillet welds need to be selected. It is required that the worker weld by manual argon arc welding. The principle of symmetric welding is adopted to reduce the deformation of the workpiece. At the same time, the welding type is intermittent welding, and the inner and outer welds are staggered. During welding, in order to reduce the deformation of the workpiece, the welding amount should be as small as possible and the welding should be uniform. The round steel is gradually welded to the existing thin-walled ring 1. During welding, pay attention to protecting other non-welded areas of the existing thin-walled ring 1 to minimize other adverse effects brought by welding and protect the workpiece; after welding, remove the process block, clean the slag and straighten the thin-walled ring 3 to be machined, and then transfer to the machining process. The deformation factors of the workpiece should also be avoided during the transfer process; consider the corresponding tooling positioning and clamping method. Since the thin-walled ring 3 to be machined has poor self-strength and small machining allowance, circumferentially evenly distributed positioning and clamping are required during the machining process. Therefore, the ultrasonic composite machining device of the present invention is used for clamping and positioning before machining, and the machine tool is used to level and verify the machining allowance. When clamping, the suspended part of the workpiece should be minimized as much as possible to reduce the deformation caused by stress, and the tooling clamping position needs to be changed inside and outside during the subsequent machining process; then start the ultrasonic machining equipment 5 to turn the inner ring surface of the existing thin-walled ring 1 in the thin-walled ring 3 to be machined and the outer circle surface of the existing ring-shaped part 2, and replace the machining tool and restart the ultrasonic machining equipment 5 to grind the end face of the existing thin-walled ring 1 and the outer circle surface of the existing ring-shaped part 2, and finally machine and form the formed thin-walled ring 4.

[0072] The present invention provides a riveting and welding repair and ultrasonic composite machining device and method for large-diameter thin-walled ring parts, which successively complete the riveting and welding repair of large-diameter thin-walled ring parts, the positioning and clamping of the thin-walled ring 3 to be machined, ultrasonic composite turning machining and surface finishing work; among them, by using the riveting and welding repair method of the present invention, the welding amount of traditional riveting and welding repair can be reduced, the welding deformation and subsequent part machining deformation, as well as the problem of post-weld machining cracking can be reduced. By using the ultrasonic composite machining device and method of the present invention, for the machining and positioning of large-diameter thin-walled ring parts, the deformation generated by the cutting resistance during the machining process of the workpiece can be reduced, the cutting speed can be increased, thereby improving the machining efficiency. At the same time, the surface finish of the workpiece can be improved, and the tool life is also significantly improved.

[0073] Optionally, the inner circle of the existing thin-walled ring 1 includes a first end-face inner circle 101, an intermediate groove 102, and a second end-face inner circle 103 arranged axially in sequence, and the second end-face inner circle 103 is close to the existing ring 2. The step "B20: Turning" specifically includes the following steps:

[0074] B201: Rough machining of the inner circle surface: Rough machine the second end-face inner circle 103 of the existing thin-walled ring 1 so that the inner diameter of the second end-face inner circle 103 after machining is close to the inner diameter of the intermediate groove 102;

[0075] B202: Machining of the existing ring 2: Machine the outer circle surface of the existing ring 2 so that two inner inclined surface circles 201 and outer inclined surface circles 202 that are coaxially arranged inside and outside and inclined are formed on the existing ring 2 after machining;

[0076] B203: Finish machining of the inner circle surface: Finish machine the second end-face inner circle 103 after rough machining so that the inner diameter of the second end-face inner circle 103 after machining is equal to the inner diameter of the intermediate groove 102.

[0077] In this optional solution, through the above-mentioned alternate turning steps of the inner circle surface and the existing ring 2, on the one hand, while ensuring that all dimensions are machined in place, it can effectively prevent the turning deformation of the thin-walled ring 3 to be machined. At the same time, since the size of the existing ring 2 is very small and the machining difficulty is great, during actual machining, the inner inclined surface circle 201 and the outer inclined surface circle 202 are alternately machined and formed to prevent machining deformation.

[0078] Preferably, when performing the step "B201: Rough machining of the inner circle surface", the angle support assembly 6 and the pressing plate assembly 8 in the ultrasonic composite machining device are radially tightened inward and vertically pressed downward on the corresponding parts from the outside of the thin-walled ring 3 to be machined;

[0079] In the step "B202: Machining of the existing ring 2", when machining the inner inclined surface circle 201, the angle support assembly 6 and the pressing plate assembly 8 in the ultrasonic composite machining device are radially tightened inward and vertically pressed downward on the corresponding parts from the outside of the thin-walled ring 3 to be machined; when machining the outer inclined surface circle 202, the angle support assembly 6 and the pressing plate assembly 8 in the ultrasonic composite machining device are radially tightened outward and vertically pressed downward on the corresponding parts from the inside of the thin-walled ring 3 to be machined;

[0080] When performing the step "B203: Finish machining of the inner circle surface", the angle support assembly 6 and the pressing plate assembly 8 in the ultrasonic composite machining device are radially tightened inward and vertically pressed downward on the corresponding parts from the outside of the thin-walled ring 3 to be machined.

[0081] In this preferred solution, through the inner and outer changes of the angle support assembly 6 and the pressing plate assembly 8 to tighten and press down, when machining the inner side of the thin-walled ring part 3 to be machined, the impedance force and the pressing force applied from the outside can be received, and at the same time, when machining the outer side, the impedance force applied from the inside can be received, thereby effectively preventing the machining deformation of the thin-walled ring part 3 to be machined and improving the machining quality and machining stability.

[0082] Optionally, step "B30: End face finishing" specifically includes: finishing the second end face of the existing thin-walled ring part 1 connecting the existing ring part 2, and finishing the outer circular surface of the existing ring part 2, so as to form an outer end face 203 parallel to the second end face of the existing thin-walled ring part 1 on the existing ring part 2. In this optional solution, through the end face finishing process, the surface roughness value can reach Ra0.4, and compared with the conventional grinding process, it can save machining time, improve machining efficiency, and reduce the machining deformation of the workpiece.

[0083] Optionally, as Figures 4-5 shown in FIGS. 10-11, the ultrasonic machining device 5 further includes a vertical bed body 52, a cross beam 53, a walking platform 54, an operation panel 55, a ram 56 connected to the vertical bed body 52, an operation table 57 connected to the workbench 51, and a tool mounting seat 58 connected to the bottom end of the ram 56; the turning tool shank 91 for performing the step of "turning machining" includes a first transducer 911 detachably connected to the tool mounting seat 58, a first amplitude transformer 912 connected to the first transducer 911, and a machining blade 913 connected to the end of the first amplitude transformer 912; the finishing tool shank 93 for performing the step of "finishing machining" includes a second transducer 931 detachably connected to the tool mounting seat 58, a second amplitude transformer 932 connected to the second transducer 931, and a finishing ball head 933 connected to the end of the second amplitude transformer 932.

[0084] Specifically, as Figures 4-5As shown in the figure, before processing, lower the ram 56 of the ultrasonic processing equipment 5 to an appropriate position, install the turning tool holder 91 on the tool mounting seat 58. The turning tool holder 91 should be installed in a horizontal or vertical state. In this embodiment, for turning the outer circle, the turning tool holder 91 is installed horizontally. After fixing the position, lock the turning tool holder 91 and the tool mounting seat 58 with bolts. Install the machining blade 913 at the tool clamping position of the turning tool holder 91. An ordinary turning blade can be used for the machining blade 913, and lock the blade with screws. Turn on the power supply, adjust the generator frequency to a reasonable value, and set the ultrasonic turning parameters (linear velocity, feed, and depth of cut). After the parameters are set, trial cut the workpiece (referring to the thin-walled ring workpiece 3 to be processed). When starting the processing, clamp the workpiece from the outside of the workpiece, and use the ultrasonic turning processing system to rough turn the inner circle of the workpiece. After rough turning, change the directions of the angle support assembly 6 and the pressing plate assembly 8, position and clamp the workpiece from the inside, and rough and finish turn the existing ring workpiece 2; change the directions of the angle support assembly 6 and the pressing plate assembly 8 again, position and clamp the workpiece from the outside, and finish turn the inner circle of the workpiece. Because the diameter of the ring workpiece is large, the wall is thin, and the surface finish requirement of the end face is high, and the size of the tongue part (referring to the existing ring workpiece 2) is extremely small. When using an ordinary lathe for processing, it is necessary to reduce the feed and rotational speed. By using the ultrasonic turning processing system (the principle of ultrasonic turning is non-continuous high-frequency vibration cutting, reducing the radial force deformation), the rotational speed and feed can be increased, thereby improving the processing efficiency.

[0085] As Figures 10-11 As shown in the figure, after completing the turning processing, remove the ultrasonic turning processing system, vertically clamp the finishing tool holder 93, adjust the generator frequency value again, and adjust the ram 56 to an appropriate position. Set the linear velocity and the pressing amount during tool setting, and perform surface finishing processing on the workpiece. During processing, by moving the positions of the angle support assembly 6 and the pressing plate assembly 8, the processing and surface finishing of different ultra-large diameter thin-walled ring workpieces can be realized. Through ultrasonic surface finishing, traditional superfinishing or grinding processing can be replaced. The surface roughness value reaches Ra0.4, saving processing time, improving processing efficiency, reducing the processing deformation of the workpiece, and other processing such as ultrasonic radial drilling can be carried out after ultrasonic turning and surface finishing of the ring workpiece.

[0086] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for riveting and welding repair of large-diameter thin-walled ring parts, characterized in that Including the steps: Weld and connect the existing annular part (2) on the end face of the existing thin-walled ring part (1) to form a thin-walled ring part to be processed (3) by combination; Process the thin-walled ring part to be processed (3) to form it into a new formed thin-walled ring part (4).

2. The method for repairing a large-diameter thin-walled ring part by riveting and welding according to claim 1, characterized in that The step of "welding and connecting the existing annular part (2) on the end face of the existing thin-walled ring part (1)" specifically includes the following steps: Spot-weld the existing thin-walled ring part (1) to the riveting fixture; Position the existing annular part (2) relative to the existing thin-walled ring part (1) so that the two are parallel and spaced 2-4 mm apart; Circumferentially weld and fixedly connect the existing annular part (2) and the existing thin-walled ring part (1).

3. An ultrasonic composite machining device for large-diameter thin-walled ring parts, characterized in that, For clamping and positioning the thin-walled ring part to be processed (3) in the large-diameter thin-walled ring part riveting and welding repair method according to any one of claims 1-2, the ultrasonic composite machining device includes: Multiple groups of angle support components (6), multiple groups of support components (7) and multiple groups of pressing plate components (8) for connecting with the workbench (51) of the ultrasonic machining equipment (5). The multiple groups of angle support components (6), multiple groups of support components (7) and multiple groups of pressing plate components (8) are sequentially and spacedly arranged along the circumferential direction of the workbench (51); The multiple groups of support components (7) are used to cooperate to support the thin-walled ring part to be processed (3); The angle support component (6) is used to abut against the inner ring surface or the outer ring surface of the thin-walled ring part to be processed (3) to limit the thin-walled ring part to be processed (3) in the radial direction; The pressing plate component (8) is used to press the thin-walled ring part to be processed (3) downward onto the multiple groups of support components (7).

4. The large-diameter thin-walled ring part ultrasonic composite machining device according to claim 3, characterized in that The support component (7) includes a support main body arranged with vertical expansion and contraction, and a first fastener passing through and connecting the support main body. The thin-walled ring part to be processed (3) is used to be supported on the top end of the support main body, and the first fastener is used to be fixed with the T-shaped groove arranged at the corresponding position on the workbench (51); The angle support component (6) includes a limit seat (61) for abutting against and limiting the inner ring surface or the outer ring surface of the thin-walled ring part to be processed (3), and a second fastener (62) passing through and connecting the limit seat (61). The limit seat (61) is supported on the workbench (51), and the second fastener (62) is used to be fixed with the T-shaped groove arranged at the corresponding position on the workbench (51).

5. The large-diameter thin-walled ring part ultrasonic composite machining device according to claim 3, characterized in that The pressing plate component (8) includes a mounting column (81), a pressing plate (82) hinged to the top end of the mounting column (81), and a tensioning member (83) passing through the pressing plate (82); The mounting column (81) is vertically supported on the workbench (51), and its bottom end is slidably connected with the T-shaped groove at the corresponding position on the workbench (51) through an outwardly protruding T-shaped bolt; The upper end of the tensioning member (83) is connected to the pressing plate (82), and the lower end of the tensioning member (83) is used to be connected to the T-shaped groove arranged at the corresponding position on the workbench (51) to relatively tension the pressing plate (82) and the workbench (51) under the action of an external force, so as to press the thin-walled ring part to be processed (3) supported on the top end of the support component (7) by the pressing plate (82).

6. An ultrasonic composite machining method for large-diameter thin-walled ring parts, characterized in that, For compound machining of a thin-walled ring to be machined (3) as claimed in any one of claims 1-2 by using an ultrasonic machining device (5) and a large-diameter thin-walled ring ultrasonic compound machining device as claimed in any one of claims 3-5, the following steps are included: Clamping and positioning: Position and clamp the thin-walled ring to be machined (3) on the ultrasonic compound machining device; Turning machining: Start the ultrasonic machining device (5) to perform turning machining on the inner ring surface of the existing thin-walled ring (1) and the outer circular surface of the existing ring-shaped part (2) in the thin-walled ring to be machined (3); End face finishing: Replace the machining tool and restart the ultrasonic machining device (5) to perform grinding machining on the end face of the existing thin-walled ring (1) and the outer circular surface of the existing ring-shaped part (2).

7. The ultrasonic composite machining method for large-diameter thin-walled ring parts according to claim 6, characterized in that, The inner circle of the existing thin-walled ring (1) includes a first end face inner circle (101), an intermediate groove (102), and a second end face inner circle (103) sequentially arranged along the axial direction, and the second end face inner circle (103) is close to the existing ring-shaped part (2). The step of "turning machining" specifically includes the following steps: Rough machining of the inner circle surface: Rough machine the second end face inner circle (103) of the existing thin-walled ring (1) so that the inner diameter of the machined second end face inner circle (103) is close to the inner diameter of the intermediate groove (102); Machining of the existing ring-shaped part (2): Machine the outer circular surface of the existing ring-shaped part (2) so that two inner inclined surface circles (201) and outer inclined surface circles (202) that are coaxially arranged inside and outside and inclined are formed on the machined existing ring-shaped part (2); Fine machining of the inner circle surface: Fine machine the rough-machined second end face inner circle (103) so that the inner diameter of the machined second end face inner circle (103) is equal to the inner diameter of the intermediate groove (102).

8. The large-diameter thin-walled ring ultrasonic compound machining method according to claim 7, wherein When performing the step of "rough machining of the inner circle surface", the angle support assembly (6) and the pressing plate assembly (8) in the ultrasonic compound machining device radially inwardly tighten and vertically press the thin-walled ring to be machined (3) from the outside thereof; In the step of "machining of the existing ring-shaped part (2)", when machining the inner inclined surface circle (201), the angle support assembly (6) and the pressing plate assembly (8) in the ultrasonic compound machining device radially inwardly tighten and vertically press the thin-walled ring to be machined (3) from the outside thereof; when machining the outer inclined surface circle (202), the angle support assembly (6) and the pressing plate assembly (8) in the ultrasonic compound machining device radially outwardly tighten and vertically press the thin-walled ring to be machined (3) from the inside thereof; When performing the step of "fine machining of the inner circle surface", the angle support assembly (6) and the pressing plate assembly (8) in the ultrasonic compound machining device radially inwardly tighten and vertically press the thin-walled ring to be machined (3) from the outside thereof.

9. The ultrasonic composite machining method for large-diameter thin-walled ring parts according to claim 6, characterized in that The step of "end face finishing" specifically includes: finishing the second end face of the existing thin-walled ring (1) connecting the existing ring-shaped part (2), and finishing the outer circular surface of the existing ring-shaped part (2) so that an outer end face (203) parallel to the second end face of the existing thin-walled ring (1) is formed on the existing ring-shaped part (2).

10. The ultrasonic composite machining method for large-diameter thin-walled ring parts according to claim 6, wherein the ultrasonic machining equipment (5) further includes a vertical bed body (52), a cross beam (53), a walking platform (54), an operation panel (55), a ram (56) connected to the vertical bed body (52), an operation table (57) connected to the workbench (51), and a tool mounting seat (58) connected to the bottom end of the ram (56); the turning tool shank (91) for performing the step of "turning machining" includes a first transducer (911) detachably connected to the tool mounting seat (58), a first horn (912) connected to the first transducer (911), and a machining blade (913) connected to the end of the first horn (912); the finishing tool shank (93) for performing the step of "finishing machining" includes a second transducer (931) detachably connected to the tool mounting seat (58), a second horn (932) connected to the second transducer (931), and a finishing ball head (933) connected to the end of the second horn (932).

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