A machining tool for thin-walled cylinders

Abstract

The utility model discloses a kind of machining tooling for thin-walled cylinder, belong to lathe tooling technical field, its technical key points are: installation on thin-walled cylinder, the contact form of traditional tooling plane clamping, point clamping is discarded by the tooling limiting mechanism of being set, arc embrace structure can be radially limited to thin-walled cylinder, greatly improve processing positioning stability, and by locking of tightening screw rod cooperation gasket and fixed nut, can be well cooperated with upper and lower arc clamping block and form all-around package limiting, further dispersed clamping stress, in addition, the clamping structure of the tooling adjusting mechanism of being set can be synchronous linear control processing with arc lower clamping block and tightening belt synchronous driving, so that clamping force evenly covers in cylinder outer circle, to greatly reduce the plastic deformation of thin-walled cylinder clamping, while adjusting operation is simple and intuitive, further improve the processing efficiency of thin-walled cylinder, with the advantage that thin-walled cylinder is conveniently clamped and adjusted positioning installation.

Description

Technical Field

[0001] This utility model relates to the field of machine tool fixtures, specifically to a machining fixture for thin-walled cylinders. Background Technology

[0002] Thin-walled cylindrical parts are core basic components in aerospace, precision instruments, hydraulics and pneumatics, and high-end intelligent manufacturing. With their unique advantages such as lightweight, compact structure, high specific strength, and excellent sealing performance, they are widely used in key working conditions such as precision transmission, high-pressure sealing, and precise load bearing. Currently, high-end equipment is constantly iterating towards precision, lightweight, miniaturization, and high stability. The industry has increasingly stringent requirements for the dimensional accuracy, wall thickness uniformity, form and position tolerances, and surface finish quality of thin-walled cylindrical parts. Among them, ultra-thin-walled cylinders with a wall thickness of 0.5mm to 1mm are the most widely used and most difficult to machine in precision equipment. The clamping problem of these parts has become a core technical bottleneck restricting product processing accuracy, finished product qualification rate, and large-scale production. It is also a key pain point in the precision machining of thin-walled cylinders in the industry.

[0003] Thin-walled cylinders with a wall thickness of 0.5mm to 1mm possess unique structural characteristics that distinguish them from conventional thick-walled cylinders and ultra-thin cylinders exceeding 0.5mm. They exhibit relatively weak overall rigidity, are hollow and unsupported, require high uniformity of wall thickness, and are extremely sensitive to external forces, making them typical flexible and easily deformable structures. Compared to conventional thin-walled cylinders with a wall thickness ≥1mm, the material redundancy in this range is significantly reduced, resulting in a marked decrease in resistance to compression, vibration, and cutting impact. Compared to ultra-thin cylinders with a wall thickness ≤0.5mm, their machining dimensions span a larger range, and the requirements for balanced clamping forces are higher. The extensive clamping methods used for conventional thin-walled parts cannot be applied, nor can the minimalist support methods used for ultra-thin parts be adopted. Currently, the industry's cylinder machining clamping systems are designed around conventional cylinder parts with a wall thickness ≥1mm. Mainstream tooling includes three-jaw and four-jaw chucks and other fixtures, which are suitable for the rigid clamping and positioning locking requirements of conventional parts. However, there is a severe lack of specific adaptability for 0.5mm to 1mm thin-walled cylinders, leading to prominent clamping contradictions and making it difficult to achieve stable clamping. Among them, three-jaw and four-jaw chucks are the industry's common basic clamping fixtures. They rely on multi-point rigid extrusion to achieve workpiece positioning and fixation. The jaws and the outer wall of the cylinder are in local point contact or line contact, resulting in highly concentrated clamping stress. For thin-walled cylinders with a wall thickness of 0.5mm to 1mm, this clamping method presents an unavoidable dilemma: if the standard clamping force is used to meet the requirements for preventing movement during processing, the concentrated stress will directly damage the cylinder wall, causing local depressions, wrinkles, and indentations on the outer wall, leading to irreversible plastic deformation; if the clamping force is reduced to avoid damage, it will cause the workpiece to become loose in positioning and the coaxiality to shift. During processing, the workpiece will experience slight movement and eccentric rotation, resulting in batches exceeding the standards for roundness, coaxiality, and dimensional accuracy, and failing to meet the actual use requirements.

[0004] Therefore, there is a need to provide a machining fixture for thin-walled cylinders, which aims to solve the above problems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model embodiment is to provide a processing tooling for thin-walled cylinders, which aims to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A machining fixture for a thin-walled cylinder, mounted on the thin-walled cylinder, includes a positioning plate for positioning the thin-walled cylinder, wherein the wall thickness of the thin-walled cylinder is β, and β satisfies 0.5mm≤β≤1mm, and further includes: The tooling limiting mechanism is installed on the outside of the thin-walled cylinder for clamping and positioning the thin-walled cylinder. The tooling limiting mechanism includes an arc-shaped upper clamping block and an arc-shaped lower clamping block for upper and lower clamping connection, as well as a tensioning strap for traction and restraint. The arc-shaped upper clamping block and the arc-shaped lower clamping block are symmetrically arranged, and each arc-shaped upper clamping block and the arc-shaped lower clamping block are provided with a through-rod groove for fitting a mating tensioning screw. The tensioning screw is fastened by a fixing nut. A tooling adjustment mechanism, installed at the connection between the arc-shaped lower clamping block and the positioning plate, is used to adjust the position of the arc-shaped lower clamping block and the tightening strap. The tooling adjustment mechanism includes an L-shaped toothed plate and a rotating gear for position adjustment. The arc-shaped lower clamping block is fixedly connected to the L-shaped toothed plate via a lower clamping block cross plate. The rotating gear is meshed with the inner side of the L-shaped toothed plate. A traction block for docking and installing the tightening strap is connected to the outer end of the lower clamping block cross plate. The two ends of the tensioning band are respectively fixed to the traction blocks on both sides of the arc-shaped lower clamping block. When the rotating gear drives the L-shaped toothed plate to move the arc-shaped lower clamping block towards the thin-walled cylinder, the traction block simultaneously drives the tensioning band to tighten, so that the tensioning band applies a circumferential binding force to the outer wall of the thin-walled cylinder, forming a multi-dimensional synergistic clamping with the clamping force of the arc-shaped upper clamping block and the arc-shaped lower clamping block.

[0007] As a further embodiment of this utility model, the tooling limiting mechanism also includes a limiting screw for lateral installation limiting of the tightening screw. The tightening screw is fastened to the upper arc-shaped clamping block and the lower arc-shaped clamping block by means of a washer and a fixing nut. The upper arc-shaped clamping block and the lower arc-shaped clamping block are each provided with a first limiting hole for lateral limiting of the limiting screw.

[0008] As a further embodiment of this utility model, the tooling limiting mechanism also includes an upper clamping block horizontal plate for traction and docking of the arc-shaped upper clamping block. The upper clamping block horizontal plate is fastened to the arc-shaped upper clamping block by a number of first fixing bolts, and the upper clamping block horizontal plate is provided with a countersunk groove adapted to place the first fixing bolts.

[0009] As a further embodiment of this utility model, the tooling limiting mechanism also includes a guide slider for moving and guiding the arc-shaped lower clamping block. The lower clamping block horizontal plate is slidably connected to the positioning plate through the guide slider. The positioning plate is provided with a guide groove adapted to slidably connect the guide slider.

[0010] As a further embodiment of this utility model, the tooling limiting mechanism further includes a tightening plate and a second fixing bolt for fastening and binding the tightening band. The tightening plate is fastened to the docking plate by a plurality of second fixing bolts. The docking plate is fixedly installed on the traction block. The traction block is adapted to slide and connect to the outside of the positioning plate. The tightening plate has a second limiting hole for the second fixing bolt to pass through, and the tightening band has a plurality of through holes for the second fixing bolt to pass through. The end of the tightening band is installed at the joint between the tightening plate and the docking plate.

[0011] As a further embodiment of this utility model, the tooling adjustment mechanism also includes an adjustment turntable for driving the rotating gear to rotate. The rotating gear is rotatably mounted on the positioning plate via a transmission shaft. A worm gear is fixedly connected to the transmission shaft, and a worm is meshed with the worm gear. The worm is rotatably mounted inside the positioning plate, and one end of the worm is fixedly connected to the adjustment turntable.

[0012] As a further embodiment of this utility model, the outer side of the positioning plate is fixedly connected with several mounting feet, and the mounting feet are provided with waist-shaped grooves for clamping and positioning.

[0013] As a further embodiment of this utility model, the thin-walled cylinder is provided with a bottom on one side or openings at both ends, and the thin-walled cylinder is filled with an inner support plate for support.

[0014] As a further embodiment of this invention, the thin-walled cylinder is provided with flanges for installation on one or both sides.

[0015] In summary, the embodiments of this utility model have the following beneficial effects compared with the prior art: This invention abandons the traditional planar and point clamping contact methods of tooling by setting a tooling limiting mechanism. The arc-shaped encircling structure can radially limit the thin-walled cylinder, effectively restricting the radial runout and circumferential displacement of the thin-walled cylinder during processing. It better solves the problems of insufficient rigidity of thin-walled cylinder and easy displacement due to processing vibration, and greatly improves the stability of processing positioning. Moreover, through the tightening screw, the washer and the locking nut, it can work well with the upper and lower arc-shaped clamping blocks to form a full-round wrapping limit. It not only makes up for the slight contact gap of the hard clamping blocks, but also further disperses the clamping stress and avoids damage to the ultra-thin cylinder wall caused by rigid compression. In addition, during processing, the tightening band can slightly adapt to the deformation of the tooling and the workpiece, offsetting the vibration and impact force generated by the machine tool processing, preventing the thin-walled cylinder from loosening or displacement due to vibration, and avoiding secondary deformation caused by rigid hard contact. It takes into account both clamping firmness and workpiece integrity, and effectively improves the overall production efficiency of thin-walled cylinder processing.

[0016] The tooling adjustment mechanism can synchronously drive the clamping structure of the arc-shaped lower clamping block and the tightening band to perform synchronous linear adjustment, so that the arc-shaped fitting support surface of the arc-shaped lower clamping block and the circumferential constraint position of the tightening band are always matched, and the clamping force is evenly covered on the outer circle of the cylinder, thereby greatly reducing the plastic deformation of the thin-walled cylinder. At the same time, the adjustment operation is simple and intuitive, which greatly shortens the time for changing and adjusting the machine, further improves the processing efficiency of the thin-walled cylinder, and effectively reduces the processing and production cost of the thin-walled cylinder.

[0017] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] Figure 2 This is a side view of an embodiment of the present utility model.

[0020] Figure 3 This is an exploded structural diagram of the arc-shaped upper clamping block connection in an embodiment of this utility model.

[0021] Figure 4 for Figure 3 A magnified structural diagram of A in the middle.

[0022] Figure 5 for Figure 3 A magnified structural diagram of B in the diagram.

[0023] Figure 6 This is an exploded structural diagram of the tightening strap connection in an embodiment of this utility model.

[0024] Figure 7 for Figure 6 A magnified structural diagram of C.

[0025] Figure 8 This is a schematic diagram of the internal connection structure of the positioning plate in an embodiment of this utility model.

[0026] Figure 9 for Figure 8 A magnified structural diagram of D in the diagram.

[0027] Figure 10 This is a schematic diagram of the connection structure of the arc-shaped lower clamping block in an embodiment of this utility model.

[0028] Reference numerals: 1. Thin-walled cylinder; 2. Flange; 3. Inner support plate; 4. Positioning plate; 5. Mounting foot; 6. Waist-shaped groove; 7. Upper clamping block horizontal plate; 8. First fixing bolt; 9. Arc-shaped upper clamping block; 10. Countersunk groove; 11. Through rod groove; 12. First limiting hole; 13. Tightening screw; 14. Washer; 15. Fixing nut; 16. Limiting screw; 17. Arc-shaped lower clamping block; 18. Lower clamping block horizontal plate; 19. Guide slider; 20. Guide groove; 21. Traction block; 22. Tightening plate; 23. Second limiting hole; 24. Second fixing bolt; 25. Butt plate; 26. L-shaped toothed plate; 27. Rotating gear; 28. Drive shaft; 29. ​​Worm gear; 30. Worm; 31. Adjusting turntable; 32. Tightening belt; 33. Through rod hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] See Figures 1-10 A machining fixture for a thin-walled cylinder, mounted on the thin-walled cylinder 1, includes a positioning plate 4 for positioning the thin-walled cylinder 1. The wall thickness of the thin-walled cylinder 1 is β, and β satisfies 0.5mm≤β≤1mm. The fixture also includes: The tooling limiting mechanism is installed on the outside of the thin-walled cylinder 1 and is used to clamp and position the thin-walled cylinder 1. The tooling limiting mechanism includes an arc-shaped upper clamping block 9 and an arc-shaped lower clamping block 17 for upper and lower clamping connection, as well as a tensioning strap 32 for traction and restraint. The arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17 are symmetrically arranged, and both the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17 are provided with through slots 11 for fitting and fastening screws 13. The fastening screws 13 are fastened by fixing nuts 15.

[0032] Furthermore, the tooling limiting mechanism also includes a limiting screw 16 for lateral installation limiting of the tightening screw 13. The tightening screw 13 is fastened to the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17 by a washer 14 and a fixing nut 15. The arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17 are both provided with a first limiting hole 12 for lateral limiting through which the limiting screw 16 passes.

[0033] Furthermore, the tooling limiting mechanism also includes an upper clamping block horizontal plate 7 for traction and docking of the arc-shaped upper clamping block 9. The upper clamping block horizontal plate 7 is fastened to the arc-shaped upper clamping block 9 by several first fixing bolts 8. The upper clamping block horizontal plate 7 is provided with a countersunk groove 10 adapted to place the first fixing bolts 8.

[0034] Furthermore, the tooling limiting mechanism also includes a guide slider 19 for moving and guiding the arc-shaped lower clamping block 17. The lower clamping block horizontal plate 18 is slidably connected to the positioning plate 4 through the guide slider 19. The positioning plate 4 is provided with a guide groove 20 adapted to slide and connect the guide slider 19.

[0035] Furthermore, the tooling limiting mechanism also includes a tightening plate 22 and a second fixing bolt 24 for fastening and binding the tightening band 32. The tightening plate 22 is fastened to the docking plate 25 by a number of second fixing bolts 24. The docking plate 25 is fixedly installed on the traction block 21. The traction block 21 is adapted to slide and connect to the outside of the positioning plate 4. The tightening plate 22 has a second limiting hole 23 for the second fixing bolt 24 to pass through, and the tightening band 32 has a number of through holes 33 for the second fixing bolt 24 to pass through. The end of the tightening band 32 is installed at the joint of the tightening plate 22 and the docking plate 25.

[0036] Furthermore, the outer side of the positioning plate 4 is fixedly connected with several mounting legs 5, and the mounting legs 5 are provided with waist-shaped grooves 6 for clamping and positioning.

[0037] Furthermore, the thin-walled cylinder 1 is provided with a bottom on one side or openings at both ends, the thin-walled cylinder 1 is filled with an inner support plate 3 for support, and a flange 2 for installation is provided on one or both sides of the thin-walled cylinder 1.

[0038] Preferably, when positioning the tooling before processing the thin-walled cylinder 1, the thin-walled cylinder 1 can be placed at the arc-shaped lower clamping block 17 on the lower clamping block horizontal plate 18. The thin-walled cylinder 1 can be filled with an inner support plate 3 for internal support, thereby avoiding subsequent clamping deformation. At this time, the upper arc-shaped clamping block 9 is fastened by the first fixing bolt 8 and the upper clamping block horizontal plate 7. Therefore, when performing tooling positioning, the tightening screw 13 is inserted into the through-rod groove 11 on the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17. Furthermore, the two ends are fastened together by the washers 14 and the fixing nuts 15, thereby completing the positioning and clamping of the thin-walled cylinder 1 by the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17. In order to further improve the clamping stability of the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17, the limiting screw 16 is threadedly connected to the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17 and located on the side of the tightening screw 13, thereby preventing the tightening screw 13 from coming out of the fastened installation position and achieving good clamping of the thin-walled cylinder 1.

[0039] To further improve the clamping stability of the thin-walled cylinder 1, the outer side of the thin-walled cylinder 1 can be bound by the tightening strap 32. The two ends of the tightening strap 32 pass through the tightening plate 22 and the through hole 33 through the second fixing bolt 24, and are threaded onto the mating plate 25. This makes it easy to bind the tightening strap 32 to the connection between the tightening plate 22 and the mating plate 25, thereby completing the limiting treatment of the thin-walled cylinder 1 by the tightening strap 32, resulting in a better clamping effect. Furthermore, the positioning plate 4 can be mounted on the machine tool table through the side mounting feet 5 and the waist-shaped groove 6, which facilitates subsequent processing.

[0040] For thin-walled cylinders with wall thicknesses of 0.5mm to 1mm, which have extremely thin walls and very poor resistance to deformation, this tooling adopts a paired arc-shaped clamping structure with an arc-shaped upper clamping block and an arc-shaped lower clamping block. The arc-shaped surface of the clamping block matches well with the outer curved surface of the thin-walled cylinder. It abandons the contact form of traditional tooling planar clamping and point clamping. The arc-shaped circumferential structure can radially limit the thin-walled cylinder, effectively limiting the radial runout and circumferential displacement of the thin-walled cylinder during processing. It better solves the problem of insufficient rigidity of thin-walled cylinders and easy displacement due to processing vibration, and greatly improves the stability of processing positioning.

[0041] By tightening the screw in conjunction with the washer and the locking nut, the upper and lower arc-shaped clamping blocks can be well coordinated to form a comprehensive wrapping and limiting effect. This not only compensates for the slight gaps in the hard clamping blocks, but also further disperses the clamping stress, avoiding damage to the ultra-thin cylinder wall caused by rigid compression. In addition, during the processing, the tightening band can slightly adapt to the deformation of the tooling and workpiece, offsetting the vibration and impact force generated by the machine tool processing, preventing the thin-walled cylinder from loosening or shifting due to vibration, while avoiding secondary deformation caused by rigid hard contact. This balances clamping firmness and workpiece integrity, effectively improving the overall production efficiency of thin-walled cylinder processing.

[0042] like Figures 1-10 As shown, this embodiment, based on the above embodiment, also includes a tooling adjustment mechanism, which is installed at the connection between the arc-shaped lower clamping block 17 and the positioning plate 4, for adjusting the position of the arc-shaped lower clamping block 17 and the tightening strap 32. The tooling adjustment mechanism includes an L-shaped toothed plate 26 and a rotating gear 27 for position adjustment. The arc-shaped lower clamping block 17 is fixedly connected to the L-shaped toothed plate 26 through the lower clamping block horizontal plate 18. The rotating gear 27 is meshed with the inner side of the L-shaped toothed plate 26. A traction block 21 for docking and installing the tightening strap 32 is connected to the outer side of the lower clamping block horizontal plate 18. The two ends of the tensioning band 32 are respectively fixed to the traction blocks 21 on both sides of the arc-shaped lower clamping block 17. When the rotating gear 27 drives the L-shaped toothed plate 26 to move the arc-shaped lower clamping block 17 towards the thin-walled cylinder 1, the traction blocks 21 simultaneously drive the tensioning band 32 to tighten, so that the tensioning band 32 applies a circumferential binding force to the outer wall of the thin-walled cylinder 1, forming a multi-dimensional synergistic clamping with the clamping force of the arc-shaped upper clamping block 9 and the arc-shaped lower clamping block 17.

[0043] Furthermore, the tooling adjustment mechanism also includes an adjustment turntable 31 for driving the rotating gear 27 to rotate. The rotating gear 27 is rotatably mounted on the positioning plate 4 via a transmission shaft 28. A worm gear 29 is fixedly connected to the transmission shaft 28, and a worm 30 is meshed on the worm gear 29. The worm 30 is rotatably mounted inside the positioning plate 4, and one end of the worm 30 is fixedly connected to the adjustment turntable 31.

[0044] Preferably, in this embodiment, to further improve the adaptability of clamping the thin-walled cylinder 1, the adjusting turntable 31 on the outside of the thin-walled cylinder 1 is adjusted according to the length of the thin-walled cylinder 1. The adjusting turntable 31 drives the worm gear 30 to rotate accordingly. Under the meshing connection between the worm gear 30 and the worm wheel 29, the rotating gear 27 on the transmission shaft 28 can be driven to rotate. Under the meshing transmission connection between the rotating gear 27 and the L-shaped toothed plate 26, the lower clamping block horizontal plate 18 at both ends can be adjusted and moved, so that the arc-shaped lower clamping block 17 can be moved to a suitable range. This makes it easier for the thin-walled cylinder 1 to undergo subsequent tooling positioning. Correspondingly and synchronously, due to the linear control movement of the lower clamping block horizontal plate 18, the traction block 21 is driven to move synchronously, which facilitates the synchronous adjustment of the binding position of the tightening belt 32. This better applies circumferential binding force to the outer wall of the thin-walled cylinder 1, making it easier to match the thin-walled cylinder 1 for tooling positioning.

[0045] This linear adjustment method allows for simultaneous linear control of the clamping structure of the arc-shaped lower clamping block and the tightening band. This ensures that the arc-shaped support surface of the lower clamping block and the circumferential constraint position of the tightening band are always matched, and the clamping force is evenly distributed over the outer circumference of the cylinder. This significantly reduces the plastic deformation of the thin-walled cylinder during clamping. At the same time, the adjustment operation is simple and intuitive, greatly shortening the time for changing and adjusting the machine, further improving the processing efficiency of the thin-walled cylinder, and effectively reducing the processing and production cost of the thin-walled cylinder.

[0046] It should be noted that the components in this application are all general standard parts or parts known to those skilled in the art, which effectively solve the technical problems raised in the background art.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A machining fixture for thin-walled cylinders, mounted on a thin-walled cylinder (1), characterized in that, The system includes a positioning plate (4) for tooling positioning of a thin-walled cylinder (1), wherein the wall thickness of the thin-walled cylinder (1) is β, and β satisfies 0.5mm≤β≤1mm. It also includes: The tooling limiting mechanism is installed on the outside of the thin-walled cylinder (1) and is used to clamp and position the thin-walled cylinder (1). The tooling limiting mechanism includes an arc-shaped upper clamping block (9) and an arc-shaped lower clamping block (17) for upper and lower clamping connection, as well as a tensioning strap (32) for traction and restraint. The arc-shaped upper clamping block (9) and the arc-shaped lower clamping block (17) are symmetrically arranged, and both the arc-shaped upper clamping block (9) and the arc-shaped lower clamping block (17) are provided with a through-rod groove (11) for fitting and fastening the fastening screw (13). The fastening screw (13) is fastened by a fixing nut (15). A tooling adjustment mechanism is installed at the connection between the arc-shaped lower clamping block (17) and the positioning plate (4) to adjust the position of the arc-shaped lower clamping block (17) and the tightening strap (32). The tooling adjustment mechanism includes an L-shaped toothed plate (26) and a rotating gear (27) for position adjustment. The arc-shaped lower clamping block (17) is fixedly connected to the L-shaped toothed plate (26) through the lower clamping block cross plate (18). The rotating gear (27) is meshed on the inner side of the L-shaped toothed plate (26). A traction block (21) for docking and installing the tightening strap (32) is connected to the outer side of the lower clamping block cross plate (18). The two ends of the tensioning band (32) are respectively fixed to the traction blocks (21) on both sides of the arc-shaped lower clamping block (17). When the rotating gear (27) drives the L-shaped toothed plate (26) to move the arc-shaped lower clamping block (17) towards the thin-walled cylinder (1), the traction block (21) simultaneously drives the tensioning band (32) to tighten, so that the tensioning band (32) applies a circumferential binding force to the outer wall of the thin-walled cylinder (1), forming a multi-dimensional cooperative clamping with the clamping force of the arc-shaped upper clamping block (9) and the arc-shaped lower clamping block (17).

2. The machining fixture for thin-walled cylinders according to claim 1, characterized in that, The tooling limiting mechanism also includes a limiting screw (16) for side installation limiting of the tightening screw (13). The tightening screw (13) is fastened to the arc-shaped upper clamping block (9) and the arc-shaped lower clamping block (17) by a washer (14) and a fixing nut (15). The arc-shaped upper clamping block (9) and the arc-shaped lower clamping block (17) are both provided with a first limiting hole (12) for the limiting screw (16) to pass through and perform side limiting.

3. The machining fixture for thin-walled cylinders according to claim 2, characterized in that, The tooling limiting mechanism also includes an upper clamping block horizontal plate (7) for pulling and connecting the arc-shaped upper clamping block (9). The upper clamping block horizontal plate (7) is fastened to the arc-shaped upper clamping block (9) by a number of first fixing bolts (8). The upper clamping block horizontal plate (7) is provided with a countersunk groove (10) adapted to place the first fixing bolts (8).

4. The machining fixture for thin-walled cylinders according to claim 3, characterized in that, The tooling limiting mechanism also includes a guide slider (19) for moving and guiding the arc-shaped lower clamping block (17). The lower clamping block horizontal plate (18) is limited and slidably connected to the positioning plate (4) through the guide slider (19). The positioning plate (4) is provided with a guide groove (20) adapted to slide and connect the guide slider (19).

5. The machining fixture for thin-walled cylinders according to claim 4, characterized in that, The tooling limiting mechanism also includes a tightening plate (22) and a second fixing bolt (24) for fastening and binding the tightening band (32). The tightening plate (22) is fastened to the docking plate (25) by a number of second fixing bolts (24). The docking plate (25) is fixedly installed on the traction block (21). The traction block (21) is adapted to slide and connect to the outside of the positioning plate (4). The tightening plate (22) is provided with a second limiting hole (23) for passing through the second fixing bolt (24), and the tightening band (32) is provided with a number of through holes (33) for passing through the second fixing bolt (24). The end of the tightening band (32) is installed at the joint of the tightening plate (22) and the docking plate (25).

6. The machining fixture for thin-walled cylinders according to claim 1, characterized in that, The tooling adjustment mechanism also includes an adjustment turntable (31) for driving the rotating gear (27) to rotate. The rotating gear (27) is rotatably mounted on the positioning plate (4) via a transmission shaft (28). A worm gear (29) is fixedly connected to the transmission shaft (28). A worm (30) is meshed on the worm gear (29). The worm (30) is rotatably mounted inside the positioning plate (4). One end of the worm (30) is fixedly connected to the adjustment turntable (31).

7. The machining fixture for thin-walled cylinders according to claim 1, characterized in that, The outer side of the positioning plate (4) is fixedly connected with several mounting feet (5), and the mounting feet (5) are provided with waist-shaped grooves (6) for clamping and positioning.

8. The machining fixture for thin-walled cylinders according to claim 1, characterized in that, The thin-walled cylinder (1) is provided with a bottom on one side or openings at both ends, and the thin-walled cylinder (1) is filled with an inner support plate (3) for support.

9. The machining fixture for thin-walled cylinders according to claim 1, characterized in that, The thin-walled cylinder (1) is provided with a flange (2) for installation on one or both sides.

Images