A large-diameter cylinder machining roundness correction tool

Abstract

This utility model discloses a rounding fixture for machining large-diameter cylinders, comprising: a fixture base having several supporting main beams spaced apart around the center of the fixture base; a bottom support seat at the bottom of each supporting main beam, all bottom surfaces of which are on the same plane and have a flatness within 0.2mm; and a top support seat at the top of each supporting main beam, all top surfaces of which are on the same plane and positioned such that their top surfaces collectively support the bottom surface of the large-diameter cylinder; the top surface of each top support seat is parallel to the bottom surface of any bottom support seat, and the flatness of its top surface is within 0.2mm. In use, only the position of the fixture relative to the rotary work platform needs to be adjusted for rounding, ensuring the dimensional accuracy of the large-diameter cylinder after machining and subsequent assembly.

Description

Technical Field

[0001] This utility model relates to auxiliary tooling for machining, and more particularly to a rounding tooling for machining large-diameter cylinders. Background Technology

[0002] Rounding is a crucial step in the machining process. Its main purpose is to correct and adjust the workpiece, which is a prerequisite for ensuring that subsequent processing can achieve the expected accuracy and quality.

[0003] Cylindrical bodies with a diameter of 5 meters or more, a thickness of 20 millimeters or more, and a height of 6 meters or less are called large-diameter cylindrical bodies. These large-diameter cylindrical bodies are usually made of rolled steel plates and are commonly used in the manufacture of pressure vessels and nuclear power plants. Currently, the method for rounding these large-diameter cylindrical bodies on CNC boring and milling machines is as follows:

[0004] A large-diameter cylinder is placed on the rotary working platform of a CNC boring and milling machine. A jack and a dial indicator are set on the CNC boring and milling machine. The measuring head of the dial indicator contacts the outer wall of the large-diameter cylinder. The center position of the large-diameter cylinder is determined by rotating the rotary working platform and measuring with the dial indicator. During the rotation of the rotary working platform and the measurement of the dial indicator, the jack is controlled to press against the outer wall of the large-diameter cylinder to adjust the position of the large-diameter cylinder on the rotary working platform according to the dial indicator data, until the center position of the large-diameter cylinder coincides with the rotation center of the rotary working platform.

[0005] However, due to their large diameter and thin wall thickness, these large-diameter cylinders are easily deformed by the pressure of the jacks during the rounding process. This makes it difficult to control the machining dimensions, affecting the final accuracy and quality of the large-diameter cylinder, which in turn affects its assembly. In more serious cases, it can even lead to scrapping and equipment failure to be delivered on time. Reducing the amount of deformation during the rounding process is very difficult. Therefore, the above-mentioned rounding method is particularly unsuitable for rounding large-diameter cylinders with roundness requirements within 3 mm and high assembly accuracy requirements. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a simple, easy-to-use, and low-cost rounding fixture for machining large-diameter cylinders. With this fixture, the large-diameter cylinder is not easily deformed during the rounding process, thus the dimensions after machining can be well controlled, ensuring the subsequent assembly accuracy. It is also applicable to occasions with high requirements for roundness and assembly accuracy.

[0007] To address the problem of easy deformation of large-diameter cylinders when adjusting their position using jacks, this invention designs a rounding fixture for machining large-diameter cylinders. The large-diameter cylinder is placed on this fixture, and during the rotation of the rotary work platform and the measurement of the dial indicator, the jack is controlled to press against the fixture based on the dial indicator data, without directly pressing against the large-diameter cylinder. This effectively prevents the large-diameter cylinder from deforming due to stress during the rounding process because of its large diameter and thin wall thickness.

[0008] The technical solution adopted by this utility model is: a rounding fixture for machining large-diameter cylinders, comprising: a fixture base, wherein the fixture base has a plurality of supporting main beams, and the supporting main beams are distributed at intervals around the center of the fixture base.

[0009] A bottom support seat is provided at the bottom of each main support beam. The bottom surfaces of all bottom support seats are on the same plane, and the flatness of the bottom surface of each bottom support seat is within 0.2mm.

[0010] A top support seat is installed at the top of each main support beam. The top surfaces of all the top supports are on the same plane, and the positions of each top support seat are such that the top surfaces of all the top supports together support the bottom surface of the large-diameter cylinder. The top surface of each top support seat is parallel to the bottom surface of any bottom support seat, and the flatness of the top surface of each top support seat is within 0.2mm.

[0011] The top and bottom surfaces of each top support and each bottom support are milled flat, and each top and bottom support is fixed to the corresponding main support beam by welding.

[0012] Furthermore, in the aforementioned large-diameter cylindrical machining center-aligning fixture, the main supporting beams are preferably distributed in a uniformly spaced manner around the center of the fixture base. This distribution ensures uniform stress distribution on the large-diameter cylindrical body, thereby reducing deformation. More preferably, the number of main supporting beams is ≥8.

[0013] A more preferred approach is to ensure that the thickness of each bottom support and each top support is 30mm or more.

[0014] Furthermore, in the aforementioned large-diameter cylindrical machining rounding fixture, the fixture base has several auxiliary support beams, each of which is connected to a main support beam to support the main support beam, thereby improving the overall strength of the fixture base.

[0015] Furthermore, in the aforementioned large-diameter cylindrical machining rounding fixture, the fixture base with several supporting main beams is constructed from several H-beams spliced ​​together to form a star-shaped structure. Auxiliary support beams made of H-beams are used to connect the main supporting beams, forming a rectangular frame structure. In this case, the entire fixture base is obtained by welding H-beams together.

[0016] Furthermore, in the aforementioned large-diameter cylinder machining rounding fixture, in addition to the aforementioned fixture base, an inner support component can also be used to support the inner wall of the large-diameter cylinder. During the handling and turning of the large-diameter cylinder, the deformation is reduced by the support of the inner support component.

[0017] The inner support component described in this solution includes an inner support ring, which is formed by several arc-shaped support plates sequentially surrounding each other; there is a gap between two adjacent arc-shaped support plates; except for the end where the gap is located, the ends of the other two adjacent arc-shaped support plates are provided with half a wedge-shaped groove, so that the other two adjacent arc-shaped support plates except for the gap are spliced ​​together to form a complete wedge-shaped groove.

[0018] A detachable external support device for opening the gap is provided at the gap, and a first fixing component is also included to fix the gap spacing after the external support device is removed from the gap.

[0019] A second fixing component is provided at each wedge groove to fix the width of the corresponding wedge groove.

[0020] Furthermore, in the aforementioned large-diameter cylindrical machining rounding fixture, the external support device is a hydraulic jack placed in the notch, and the hydraulic jack is supported on the notch end face of two arc-shaped support plates at the notch.

[0021] In addition to the above-mentioned configuration, the hydraulic jack can also be provided with two additional grooves. Specifically, a first groove and a second groove are respectively provided on the end face of the two arc-shaped support plates at the notch, and the hydraulic jack is supported in the first groove and the second groove.

[0022] Furthermore, in the aforementioned large-diameter cylindrical machining rounding fixture, the first fixing component includes: a first connecting plate and a second connecting plate;

[0023] A plurality of first waist-shaped holes are provided on the first connecting plate, and a plurality of first threaded holes are provided on the top surface of the two arc-shaped support plates at the notch. Each first threaded fastener passes through the corresponding first waist-shaped hole and is screwed into the corresponding first threaded hole, thereby locking the notch spacing.

[0024] A number of second waist-shaped holes are provided on the second connecting plate, and a number of second threaded holes are provided on the inner sidewalls of the two arc-shaped support plates at the notch. Each second threaded fastener passes through the corresponding second waist-shaped hole and is screwed into the corresponding second threaded hole, thereby locking the notch spacing.

[0025] The first connecting plate, each first threaded fastener, and the second connecting plate, each second threaded fastener, achieve dual locking to ensure stable and reliable locking.

[0026] Furthermore, in the aforementioned large-diameter cylindrical machining rounding fixture, the second fixing component includes: a wedge block, a third connecting plate, and a fourth connecting plate; the wedge block is inserted into a corresponding wedge groove;

[0027] A number of third waist-shaped holes are provided on the third connecting plate, and a number of third threaded holes are provided on the top surface of the two arc-shaped support plates at the corresponding wedge groove. Each third threaded fastener passes through the corresponding third waist-shaped hole and is screwed into the corresponding third threaded hole, thereby locking the width of the corresponding wedge groove.

[0028] A number of fourth waist-shaped holes are provided on the fourth connecting plate. A number of fourth threaded holes are provided on the inner sidewalls of the two arc-shaped support plates at the corresponding wedge groove. Each fourth threaded fastener passes through the corresponding fourth waist-shaped hole and is screwed into the corresponding fourth threaded hole, thereby locking the width of the corresponding wedge groove.

[0029] The third connecting plate, each third threaded fastener, and the fourth connecting plate, each fourth threaded fastener, achieve double locking to ensure stable and reliable locking.

[0030] Furthermore, in the aforementioned large-diameter cylinder machining rounding fixture, a plurality of fixed seats are evenly spaced along the circumference on the top surface of the inner support ring, and each fixed seat is provided with at least one threaded fastener that can pass through the corresponding connecting hole on the side wall of the large-diameter cylinder and fix the large-diameter cylinder to the fixed seat.

[0031] By fixing each fixed seat to the large-diameter cylinder, the position of the inner support assembly is fixed, further ensuring that the inner support assembly can stably and reliably support the large-diameter cylinder.

[0032] The beneficial effects of this utility model are: the tooling structure is simple, easy to use, and low in cost. Using this tooling can effectively prevent deformation of large-diameter cylinders due to their large diameter and thin wall thickness during the rounding process, ensuring that the dimensional requirements after machining can be controlled and guaranteeing the accuracy requirements of subsequent assembly. This tooling is also suitable for applications with high roundness and assembly accuracy requirements. Furthermore, the addition of internal support components can reduce the deformation of large-diameter cylinders during handling and turning, ensuring the accuracy of the large-diameter cylinders themselves, thereby guaranteeing the accuracy requirements of subsequent assembly and improving production efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the first structure and use of a rounding fixture for machining large-diameter cylinders as described in this utility model.

[0034] Figure 2 yes Figure 1 A top-view structural diagram of the tooling base.

[0035] Figure 3 yes Figure 1 A structural schematic diagram of the base of the tooling unit viewed from below.

[0036] Figure 4 This is a schematic diagram of the second structure and use of a rounding fixture for machining large-diameter cylinders as described in this utility model.

[0037] Figure 5 yes Figure 4 A top-view structural diagram of the inner support component.

[0038] Figure 6 yes Figure 5 A magnified schematic diagram of part B in the middle section.

[0039] Figure 7 yes Figure 6 A schematic diagram of the structure after removing the second fixing component.

[0040] Figure 8 yes Figure 5 A magnified schematic diagram of part C in the middle.

[0041] Figure 9 yes Figure 8 A schematic diagram of the structure after removing the first fixed component.

[0042] Figure 10 This is the third structure and usage diagram of a rounding fixture for machining large-diameter cylinders as described in this utility model.

[0043] Figure 11 yes Figure 10 A magnified schematic diagram of part A in the middle.

[0044] Figure 12 yes Figure 10 A top-view structural diagram of the inner support component.

[0045] in:

[0046] 1. Main support beam; 2. Bottom support seat; 3. Top support seat; 4. Auxiliary support beam; 5. Rotary working platform; 6. Jack; 7. Dial indicator; 8. Large diameter cylinder; 9. Arc-shaped support plate; 10. Notch; 11. Inner support assembly; 12. Hydraulic jack; 13. First connecting plate; 14. First oblong hole; 15. First groove; 16. Second groove; 17. Wedge block; 18. Second connecting plate; 19. Second threaded fastener; 20. Wedge groove; 21. Third connecting plate; 22. Third oblong hole; 23. Fourth connecting plate; 24. Fourth threaded fastener; 25. Connecting hole; 26. Bushing; 27. Bolt; 28. Tooling base; 29. ​​First threaded hole; 30. Third threaded hole; 31. Fixed seat. Detailed Implementation

[0047] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, the exemplary embodiments described may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of this disclosure.

[0048] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other. Example 1

[0049] This embodiment describes a rounding fixture for machining large-diameter cylindrical bodies, such as... Figure 1 , Figure 2 and Figure 3 As shown, it includes: a tooling base 28, the tooling base 28 having a plurality of supporting main beams 1, the supporting main beams 1 being distributed at intervals around the center of the tooling base 28; a bottom support seat 2 is provided at the bottom of each supporting main beam 1, the bottom surfaces of all bottom support seats 2 are on the same plane, and the flatness of the bottom surfaces of each bottom support seat 2 is within 0.2mm; a top support seat 3 is provided at the top of each supporting main beam 1, the top surfaces of all top support seats 3 are on the same plane, and the positions of each top support seat 3 are such that the top surfaces of each top support seat 3 collectively support the bottom surface of the large-diameter cylinder 8; the top surface of each top support seat 3 is parallel to the bottom surface of any bottom support seat 2, and the flatness of the top surface of each top support seat 3 is within 0.2mm.

[0050] A more preferred approach is that the supporting main beams 1 are evenly spaced around the center of the tooling base 28. Because the large-diameter cylinder 8 has a large diameter, thin walls, and is relatively soft overall, at least eight supporting main beams 1 are required to better support the large-diameter cylinder 8 and reduce the deformation of the large-diameter cylinder 8 caused by the support.

[0051] A more preferred approach is to ensure that the thickness of each bottom support 2 and each top support 3 is 30mm or more.

[0052] A more preferred embodiment is that the tooling base 28 has several auxiliary support beams 4, and each main support beam 1 is reinforced by the corresponding auxiliary support beam 4 to improve the overall support strength of the tooling base 28.

[0053] A more preferred solution is that the tooling base 28 with several supporting main beams 1 is fixed by splicing several H-beams, and the overall structure is a star-shaped structure. All auxiliary supporting beams 4 are also made of H-beams, and are connected and supported by several H-beams to each supporting main beam 1, forming a rectangular frame structure.

[0054] The process of using the aforementioned large-diameter cylindrical machining rounding fixture for rounding is as follows:

[0055] The aforementioned large-diameter cylinder machining center adjustment fixture is placed on the rotary work platform 5 of the CNC boring and milling machine. The large-diameter cylinder 8 is then placed on the center adjustment fixture, with its bottom surface resting on the top surfaces of the top support seats 3. A jack 6 and a dial indicator 7 are installed on the CNC boring and milling machine. The measuring head of the dial indicator 7 contacts the outer wall of the large-diameter cylinder 8. The center position of the large-diameter cylinder 8 is determined by the rotation of the rotary work platform 5 and the measurement by the dial indicator 7. During the rotation of the rotary work platform 5 and the measurement by the dial indicator 7, the position of the large-diameter cylinder 8 on the rotary work platform 5 is adjusted based on the data from the dial indicator 7, until the center position of the large-diameter cylinder 8 coincides with the rotation center of the rotary work platform 5.

[0056] The aforementioned roundness-correcting fixture for machining large-diameter cylinders is simple in structure, easy to use, and low in cost. Using this fixture, only the position of the fixture relative to the rotary working platform 5 needs to be adjusted for roundness correction, without having to press against the cylinder wall of the large-diameter cylinder 8. Therefore, it can effectively prevent the large-diameter cylinder 8 from deforming due to stress during the roundness correction process because of its large diameter and thin wall thickness, ensuring that the dimensional requirements after machining can be controlled and the subsequent assembly accuracy requirements can be guaranteed. This fixture is also applicable to occasions with high roundness and assembly accuracy requirements. Example 2

[0057] This embodiment describes a rounding fixture for machining large-diameter cylindrical bodies, such as... Figure 1 , Figure 2and Figure 3 As shown, it includes: a tooling base 28, the tooling base 28 having a plurality of supporting main beams 1, the supporting main beams 1 being distributed at intervals around the center of the tooling base 28; a bottom support seat 2 is provided at the bottom of each supporting main beam 1, the bottom surfaces of all bottom support seats 2 are on the same plane, and the flatness of the bottom surfaces of each bottom support seat 2 is within 0.2mm; a top support seat 3 is provided at the top of each supporting main beam 1, the top surfaces of all top support seats 3 are on the same plane, and the positions of each top support seat 3 are such that the top surfaces of each top support seat 3 collectively support the bottom surface of the large-diameter cylinder 8; the top surface of each top support seat 3 is parallel to the bottom surface of any bottom support seat 2, and the flatness of the top surface of each top support seat 3 is within 0.2mm.

[0058] A more preferred approach is that the supporting main beams 1 are evenly spaced around the center of the tooling base 28. Because the large-diameter cylinder 8 has a large diameter, thin walls, and is relatively soft overall, at least eight supporting main beams 1 are required to better support the large-diameter cylinder 8 and reduce the deformation of the large-diameter cylinder 8 caused by the support.

[0059] A more preferred approach is to ensure that the thickness of each bottom support 2 and each top support 3 is 30mm or more.

[0060] A more preferred embodiment is that the tooling base 28 has several auxiliary support beams 4, and each main support beam 1 is reinforced by the corresponding auxiliary support beam 4 to improve the overall support strength of the tooling base 28.

[0061] A more preferred solution is that the tooling base 28 with several supporting main beams 1 is fixed by splicing several H-beams, and the overall structure is a star-shaped structure. All auxiliary supporting beams 4 are also made of H-beams, and are connected and supported by several H-beams to each supporting main beam 1, forming a rectangular frame structure.

[0062] The large-diameter cylinder machining rounding fixture also includes: an inner support assembly 11 for supporting the inner wall of the large-diameter cylinder 8; such as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the inner support component 11 in this embodiment includes an inner support ring, which is formed by a plurality of arc-shaped support plates 9 sequentially surrounding each other; wherein there is a notch 10 between two adjacent arc-shaped support plates 9; except for the end where the notch 10 is located, the ends of the other two adjacent arc-shaped support plates are provided with half wedge-shaped grooves, so that the other two adjacent arc-shaped support plates 9 except for the notch 10 are spliced ​​together to form a complete wedge-shaped groove 20.

[0063] An external support device for opening the notch 10 is detachably provided at the notch 10, and a first fixing component is also included to fix the notch spacing after the external support device is removed from the notch 10.

[0064] The external support device is a hydraulic jack 12 placed in the notch 10, and the hydraulic jack 12 is supported on the notch end faces of the two arc-shaped support plates 9 at the notch 10.

[0065] In addition to the above-mentioned configuration, the hydraulic jack 12 can also be equipped with two additional grooves, such as... Figure 9 As shown, specifically: a first groove 15 and a second groove 16 are respectively provided on the notch end faces of the two arc-shaped support plates 9 at the notch, and the hydraulic jack 12 is supported in the first groove 15 and the second groove 15.

[0066] like Figure 8 and Figure 9 As shown, in this embodiment, the first fixing component includes: a first connecting plate 13 and a second connecting plate 18;

[0067] A plurality of first waist-shaped holes 14 are provided on the first connecting plate 13, and a plurality of first threaded holes 29 are provided on the top surface of the two arc-shaped support plates 9 at the notch 10. Each first threaded fastener passes through the corresponding first waist-shaped hole 14 and is screwed into the corresponding first threaded hole 29, thereby locking the notch spacing.

[0068] A plurality of second waist-shaped holes are provided on the second connecting plate 18, and a plurality of second threaded holes are provided on the inner sidewalls of the two arc-shaped support plates 9 at the notch 10. Each second threaded fastener 19 passes through the corresponding second waist-shaped hole and is screwed into the corresponding second threaded hole, thereby locking the notch spacing.

[0069] The first connecting plate 13, each first threaded fastener, the second connecting plate 18, and each second threaded fastener 19 achieve double locking, ensuring stable and reliable locking.

[0070] A second fixing component is provided at each wedge groove 20 to fix the width of the corresponding wedge groove.

[0071] like Figure 6 and Figure 7 As shown, in this embodiment, the second fixing component includes: a wedge block 17, a third connecting plate 21, and a fourth connecting plate 23; the wedge block 17 is inserted into the corresponding wedge groove 20;

[0072] A plurality of third waist-shaped holes 22 are provided on the third connecting plate 21. A plurality of third threaded holes 30 are provided on the top surface of the two arc-shaped support plates 9 at the corresponding wedge groove 20. Each third threaded fastener passes through the corresponding third waist-shaped hole 22 and is screwed into the corresponding third threaded hole 30, thereby locking the width of the corresponding wedge groove.

[0073] A number of fourth waist-shaped holes are provided on the fourth connecting plate 23. A number of fourth threaded holes are provided on the inner sidewalls of the two arc-shaped support plates 9 at the corresponding wedge groove 20. Each fourth threaded fastener 24 passes through the corresponding fourth waist-shaped hole and is screwed into the corresponding fourth threaded hole, thereby locking the width of the corresponding wedge groove.

[0074] The third connecting plate 21, each fourth threaded fastener, and the fourth connecting plate 23 and each fourth threaded fastener 24 achieve double locking, ensuring stable and reliable locking.

[0075] The assembly and disassembly process of the internal support assembly supporting the large-diameter cylinder is as follows:

[0076] First, each wedge block 17 is placed in the corresponding wedge groove 20, each corresponding fourth connecting plate 23 abuts against the corresponding wedge block 17, and each fourth threaded fastener 24 passes through the corresponding fourth waist-shaped hole and is screwed into the corresponding fourth threaded hole, and each fourth threaded fastener 24 is not tightened; each third connecting plate 21 is placed on the top surface of the inner support ring 9 at the corresponding wedge groove 20, and each third threaded fastener passes through the corresponding third waist-shaped hole 22 and is screwed into the corresponding third threaded hole 30, and each third threaded fastener is not tightened;

[0077] The first connecting plate 13 is placed on the top surface of the two arc-shaped support plates 9 at the notch 10. Each first threaded fastener passes through the corresponding first waist-shaped hole 14 and is screwed into the corresponding first threaded hole 29, and each first threaded fastener is not tightened. The second connecting plate 18 is placed on the inner side wall of the two arc-shaped support plates 9 at the notch 10. Each second threaded fastener 19 passes through the corresponding second waist-shaped hole and is screwed into the corresponding second threaded hole, and the second threaded fastener 19 is not tightened.

[0078] Next, the inner support ring 9 is placed into the large-diameter cylinder 8 using the lifting method of the lifting ring. Then, the gap is adjusted by the hydraulic jack 12 until the inner support ring 9 is tightly attached to the inner wall of the large-diameter cylinder 8.

[0079] Next, the position of the extended inner support ring 9 is locked by the second fixing component. Specifically, the fourth threaded fasteners 24 are tightened so that the corresponding fourth connecting plate 23 is tightly pressed against the corresponding wedge block 17, thereby tightly fitting each wedge block 17 into the corresponding wedge groove 20, locking the insertion depth of the wedge block 17 into the corresponding wedge groove 20. Then, the third threaded fasteners are tightened to lock the width of the corresponding wedge groove. At this time, the inner support ring 9 expands and adheres to the inner wall of the large-diameter cylinder 8. It is important to note that the insertion depth of the wedge block 17 must be controlled during the expansion process to control the overall expansion force of the inner support ring, ensuring that the roundness of the cylinder is within the required range.

[0080] To improve the reliability of the connection, each third threaded fastener can be welded to the corresponding third connecting plate 21, and each fourth threaded fastener 24 can be welded to the corresponding fourth connecting plate 23.

[0081] Finally, remove the hydraulic jack 12, tighten each of the first threaded fasteners and each of the second threaded fasteners 19, and lock the notch spacing.

[0082] Similarly, to improve the reliability of the connection, each first threaded fastener can be welded to the corresponding first connecting plate 13, and each second threaded fastener 19 can be welded to the corresponding second connecting plate 18.

[0083] The internal support component 11 and the tooling base 28 work together to support the large-diameter cylinder 8, which can effectively prevent the large-diameter cylinder from deforming during handling, turning, and rounding due to its large diameter and thin wall thickness. This ensures that the dimensional requirements after machining can be controlled, guarantees the subsequent assembly accuracy requirements, and greatly improves production efficiency. This tooling is also suitable for occasions with high roundness and assembly accuracy requirements. Example 3

[0084] In this embodiment, a fixing seat 31 is added based on embodiment two to fix the position of the inner support component 11 inside the large-diameter cylinder 8, ensuring that the inner support component 11 is stable and reliable and will not slide due to external factors.

[0085] like Figure 10 , Figure 11 and Figure 12 As shown, in this embodiment, a plurality of fixing seats 31 are evenly spaced along the circumference on the top surface of the inner support ring. Each fixing seat 31 is provided with at least one threaded fastener that can pass through the corresponding connecting hole 25 on the side wall of the large-diameter cylinder 8 and fix the large-diameter cylinder 8 to the fixing seat 31.

[0086] After the inner support assembly 11 is used to expand and attach to the large-diameter cylinder 8, the relative positions of the inner support assembly 11 and the large-diameter cylinder 8 are locked by threaded fasteners. Specifically, the large-diameter cylinder 8 has several connecting holes 25, and a corresponding bushing 26 is placed in each connecting hole 25. Each bolt 27 passes through the corresponding bushing 26 and is tightened with the corresponding threaded hole on the corresponding fixing seat 31.

[0087] The internal support component 11 and the tooling base 28 work together to support the large-diameter cylinder 8, which can effectively prevent the large-diameter cylinder from deforming during handling, turning, and rounding due to its large diameter and thin wall thickness. This ensures that the dimensional requirements after machining can be controlled, guarantees the subsequent assembly accuracy requirements, and greatly improves production efficiency. This tooling is also suitable for occasions with high roundness and assembly accuracy requirements.

[0088] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. A rounding fixture for machining large-diameter cylindrical bodies, comprising: A tooling base, characterized in that: the tooling base has a plurality of supporting main beams, and the supporting main beams are distributed at intervals around the center of the tooling base; A bottom support seat is provided at the bottom of each main support beam. The bottom surfaces of all bottom support seats are on the same plane, and the flatness of the bottom surface of each bottom support seat is within 0.2mm. A top support seat is installed at the top of each main support beam. The top surfaces of all the top supports are on the same plane, and the positions of each top support seat are such that the top surfaces of all the top supports together support the bottom surface of the large-diameter cylinder. The top surface of each top support seat is parallel to the bottom surface of any bottom support seat, and the flatness of the top surface of each top support seat is within 0.2mm.

2. The roundness correction tool for machining large diameter cylinder according to claim 1, characterized in that: The main support beams are evenly spaced around the center of the tooling base; the number of main support beams is ≥8; the thickness of each bottom support and each top support is ≥30mm.

3. The roundness correction tool for machining large diameter cylinder according to claim 1 or 2, characterized in that: The tooling base has several auxiliary support beams, and each main support beam is reinforced by a corresponding auxiliary support beam.

4. The roundness correction tool for machining large diameter cylinder according to claim 3, characterized in that: The tooling base with several supporting main beams is formed by splicing several H-beams to form a cross structure. The auxiliary support beams made of H-beams are used to form a rectangular frame structure when connecting the main support beams.

5. The rounding fixture for machining large-diameter cylindrical bodies according to claim 1, characterized in that: Also includes: Internal support components used to support the inner wall of large-diameter cylinders; The inner support assembly includes an inner support ring, which is formed by a number of arc-shaped support plates sequentially surrounding each other; wherein there is a gap between two adjacent arc-shaped support plates; except for the end where the gap is located, the ends of the other two adjacent arc-shaped support plates are provided with half a wedge-shaped groove, so that the other two adjacent arc-shaped support plates except for the gap are spliced ​​together to form a complete wedge-shaped groove. A detachable external support device for opening the gap is provided at the gap, and a first fixing component is also included to fix the gap spacing after the external support device is removed from the gap. A second fixing component is provided at each wedge groove to fix the width of the corresponding wedge groove.

6. The roundness correction tool for machining large diameter cylinders according to claim 5, characterized in that: The external support device is a hydraulic jack placed in the gap, and the hydraulic jack is supported on the end face of the gap of two arc-shaped support plates at the gap.

7. The roundness correction tool for machining large diameter cylinders according to claim 5, characterized in that: The structure of the external support device is as follows: a first groove and a second groove are respectively opened on the end face of the two arc-shaped support plates at the notch, and the hydraulic jack is supported in the first groove and the second groove.

8. The roundness correction tool for machining large diameter cylinders according to claim 5 or 6 or 7, characterized in that: The first fixing component includes: a first connecting plate and a second connecting plate; A plurality of first waist-shaped holes are provided on the first connecting plate, and a plurality of first threaded holes are provided on the top surface of the two arc-shaped support plates at the notch. Each first threaded fastener passes through the corresponding first waist-shaped hole and is screwed into the corresponding first threaded hole, thereby locking the notch spacing. A number of second waist-shaped holes are provided on the second connecting plate, and a number of second threaded holes are provided on the inner sidewalls of the two arc-shaped support plates at the notch. Each second threaded fastener passes through the corresponding second waist-shaped hole and is screwed into the corresponding second threaded hole, thereby locking the notch spacing.

9. The roundness correction tool for machining large diameter cylinder according to claim 5 or 6 or 7, characterized in that: The second fixing component includes: a wedge block, a third connecting plate, and a fourth connecting plate; the wedge block is inserted into a corresponding wedge groove; A number of third waist-shaped holes are provided on the third connecting plate, and a number of third threaded holes are provided on the top surface of the two arc-shaped support plates at the corresponding wedge groove. Each third threaded fastener passes through the corresponding third waist-shaped hole and is screwed into the corresponding third threaded hole, thereby locking the width of the corresponding wedge groove. The fourth connecting plate has several fourth waist-shaped holes, and the inner sidewalls of the two arc-shaped support plates at the corresponding wedge grooves have several fourth threaded holes. Each fourth threaded fastener passes through the corresponding fourth waist-shaped hole and is screwed into the corresponding fourth threaded hole, thereby locking the width of the corresponding wedge groove.

10. The roundness correction tool for machining large diameter cylinders of claim 1, wherein: Several fixing seats are evenly spaced along the circumference on the top surface of the inner support ring. Each fixing seat is provided with at least one threaded fastener that can pass through the corresponding connection hole on the side wall of the large-diameter cylinder and fix the large-diameter cylinder to the fixing seat.

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