Cylinder section friction stir welding near-circle device and method for profile deviation compensation

Abstract

The invention provides a profile deviation compensation barrel section friction stir welding near-circle device and method. The profile deviation compensation barrel section friction stir welding near-circle device comprises a base, a tool support, an upper inner support shape retaining ring structure, a lower inner support shape retaining ring structure and a vertical driving structure. The multiple tool supports are arranged on the base at equal intervals along the circumference, and the upper inner supporting shape-retaining ring structures and the lower inner supporting shape-retaining ring structures are arranged on the upper sides and the lower sides of the tool supports correspondingly. The vertical driving structure is arranged on the tool support and can drive the upper inner supporting shape retaining ring structure to move up and down along the tool support. The inner supporting shape-preserving ring has the beneficial effects that the circumference of the inner supporting shape-preserving ring is adjustable, it is effectively guaranteed that the last wall plate can be smoothly placed in the inner supporting shape-preserving ring, and assembling, welding and shape preserving of three wall plates, six wall plates and barrel sections with different heights are considered.

Description

Technical Field

[0001] The invention belongs to the field of tank processing, and in particular relates to a cylinder section friction stirring welding near-circular device and method for compensating for profile deviation. Background Art

[0002] The tank is the carrier of rocket fuel, of which the tank bottom and barrel are the most important core components, and the barrel accounts for the largest proportion of the entire tank. my country's current tank models are usually composed of 1-8 barrels, with a welding thickness of 5-10mm, a height ranging from 250-2200mm, and a diameter of Φ2250mm, Φ3350mm and Φ5000mm. The barrel is generally welded by four wall panels using a stir friction method, and its sealing, weld strength, and shape and position dimensional accuracy directly affect the tank's carrying capacity.

[0003] After the barrel section is welded, it is welded with the bottom of the box and other barrel sections to form a tank. The rocket tank ring seam has two types of joints: box bottom-barrel section and barrel section-barrel section. Among them, the barrel section-barrel section weld size matching and ring seam assembly control are relatively simple, and the weld quality is good; the box bottom-barrel section ring seam is due to the box bottom transition ring is an integral aluminum forging, the heat treatment state is quenching + cold forging + artificial aging, the barrel section heat treatment state is quenching + about 10% cold working deformation + artificial aging, the deformation capacity of the transition ring is poorer than the barrel section, and the barrel section circumference must be strictly controlled to be smaller than the box bottom transition ring during welding. At present, the tank ring seam is generally welded by fusion welding. On the one hand, fusion welding has relatively low requirements for assembly quality and a large assembly misalignment margin; on the other hand, the barrel section is small in thickness and weak in rigidity, and the barrel section roundness correction can be carried out through the internal support of the ring seam welding jig to meet the docking requirements; thirdly, the barrel section can achieve elastic deformation through the internal support tooling to compensate for the circumference. In summary, the tank circumferential seam welding has relatively low requirements on the roundness, circumference and welding deformation of the cylinder section, and the assembly welding process can be adjusted through tooling to meet the welding requirements.

[0004] The longitudinal seam of the front barrel section only relies on the welding pad and the main shaft of the equipment, and the wall panel support lifting car trolley can be used to stir friction welding. In this way, the roundness, weld quality and circumference of the barrel section cannot be guaranteed. First, the longitudinal seam friction stir welding equipment of the barrel section does not have a conformal tooling to maintain the roundness of the welding process, and the roundness deviation of the barrel section is large; second, after the longitudinal seam of the barrel section is positioned, it is welded through through a formal welding. Due to the structural characteristics of the stirring tool, the weld has a serious concave deformation; third, the circumference of the barrel section docking with the bottom transition ring must be smaller than the circumference of the bottom of the box, so that the circumference can be compensated by the internal support of the circumferential seam welding frame to eliminate the assembly misalignment. Once the circumference of the barrel section is greater than the circumference of the bottom transition ring of the box, assembly welding cannot be performed.

[0005] The longitudinal seam of the front barrel section only relies on the welding pad and the main shaft of the equipment, and the wall panel support lifting car trolley can be used to stir friction welding. In this way, the roundness, weld quality and circumference of the barrel section cannot be guaranteed. First, the longitudinal seam friction stir welding equipment of the barrel section does not have a conformal tooling to maintain the roundness of the welding process, and the roundness deviation of the barrel section is large; second, after the longitudinal seam of the barrel section is positioned, it is welded through through a formal welding. Due to the structural characteristics of the stirring tool, the weld has a serious concave deformation; third, the circumference of the barrel section docking with the bottom transition ring must be smaller than the circumference of the bottom of the box, so that the circumference can be compensated by the internal support of the circumferential seam welding frame to eliminate the assembly misalignment. Once the circumference of the barrel section is greater than the circumference of the bottom transition ring of the box, assembly welding cannot be performed. Summary of the invention

[0006] In view of this, the present invention aims to propose a near-circular device and method for friction stir welding of barrel sections with profile deviation compensation, so as to solve at least one technical problem in the background technology.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows: A near-circular device for friction stir welding of barrel sections with profile deviation compensation includes a base, a tooling bracket, an upper inner support shape-keeping ring structure, a lower inner support shape-keeping ring structure, and a vertical drive structure; A plurality of tooling brackets are arranged on the base at equal intervals along the circumference, and an upper inner support shape-retaining ring structure and a lower inner support shape-retaining ring structure are arranged on upper and lower sides of the tooling bracket respectively; The vertical driving structure is arranged on the tooling bracket, and the vertical driving structure can drive the upper inner support shape retaining ring structure to move up and down along the tooling bracket.

[0008] Furthermore, the upper inner support shape-keeping ring structure includes a plurality of upper inner support shape-keeping ring devices, and the plurality of upper inner support shape-keeping ring devices are circumferentially arranged on the tooling bracket; The upper inner support shape retaining ring device comprises a first working table, an upper inner support adjustment table, and an upper clamping assembly; The first workbench is slidably arranged on the tooling bracket, and the upper inner support adjustment platform slides along the first workbench through the first radial driving assembly; A plurality of upper clamping assemblies are arranged on the upper inner support adjustment platform along the circumference; The end surface of the upper inner support adjustment platform is arc-shaped.

[0009] Further, the first radial drive assembly includes a first drive cylinder, a first threaded rod, and a first sliding block; The mounting end of the first driving cylinder is arranged on the first workbench, and the output end of the first driving cylinder is connected to the first threaded rod; The first sliding block is arranged at the bottom of the upper inner support adjustment platform, the first sliding block is threadedly arranged on the first threaded rod, and the first driving cylinder can drive the upper inner support adjustment platform to perform radial adjustment; A second sliding block is arranged on the upper part of the first workbench, and a first sliding rail corresponding to the second sliding block is arranged on the upper inner support adjustment platform.

[0010] Further, the vertical driving structure includes a driving motor, a second threaded rod, and a third sliding block; The mounting end of the driving motor is arranged on the tooling bracket, the output end of the driving motor is connected to the second threaded rod, and the upper inner support shape retaining ring structure is threadedly connected to the second threaded rod through the third sliding block.

[0011] Furthermore, the lower inner support shape-keeping ring structure includes a plurality of lower inner support shape-keeping ring devices, and the plurality of lower inner support shape-keeping ring devices are circumferentially arranged on the tooling bracket; The lower inner support shape retaining ring device comprises a second workbench, a lower inner support adjustment table, and a lower clamping assembly; The second workbench is slidably arranged on the tooling bracket, and the lower inner support adjustment platform slides along the second workbench through the second radial driving assembly; A plurality of lower clamping assemblies are arranged on the upper inner support adjusting platform along the circumference.

[0012] Further, the second radial drive assembly includes a second drive cylinder, a third threaded rod, and a fourth sliding block; The mounting end of the second driving cylinder is arranged on the second workbench, the output end of the second driving cylinder drives the third threaded rod to rotate through a belt, the third threaded rod is arranged on the second workbench, the fourth sliding block is arranged at the bottom of the lower inner support adjustment platform, the fourth sliding block is threadedly arranged on the third threaded rod, and the second driving cylinder can drive the upper inner support adjustment platform to perform radial adjustment; A second slide rail is arranged on the upper part of the base, and a second slide rail corresponding to the fifth slide block is arranged on the lower inner support adjustment platform.

[0013] Further, the upper clamping assembly and the lower clamping assembly each include a third driving cylinder, a cylinder base, a push block, a connecting rod, a rotating plate, and a clamping plate; The mounting end of the third cylinder is arranged above the cylinder base, the cylinder base is arranged on the upper inner support adjustment platform or the lower inner support adjustment platform, and the output end of the third cylinder is connected to the push block; Sixth sliding blocks are arranged on both sides of the push block, and a slide groove corresponding to the fifth sliding block is arranged on the cylinder base; A rotating rod is provided on the cylinder base, and a first movable hole corresponding to the rotating rod is provided on the rotating plate. The rotating rod is arranged on the cylinder base: A pulley is provided at one end of the rotating plate and a clamping plate is provided at the other end: The connecting rod is arranged on the cylinder base, and the rotating plate is provided with a second movable hole, the connecting rod can pass through the second movable hole, and the rotating plate can slide along the second movable hole.

[0014] Furthermore, first springs are provided on both sides of the cylinder base, and ends of the first springs are connected to the rotating plate; A second spring is arranged on the rotating plate, and an end of the second spring is connected with the clamping plate.

[0015] Furthermore, an adjustment hole is provided on the clamping plate, and a ladder is provided on the tooling bracket.

[0016] A method for preparing a near-circular cylinder segment by friction stir welding based on profile deviation compensation, using the above-mentioned near-circular cylinder segment friction stir welding device with profile deviation compensation, adjusting the diameter of the inner support conformal ring to the inner diameter of the product during welding, and locking it through the upper inner support conformal ring structure and the lower inner support conformal ring structure, and reserving welding shrinkage for the wall plate, but the final cylinder segment diameter after welding is smaller than the inner diameter of the product; Calculate the total circumference of the cylinder section, then average the circumference of the cylinder section to 3 or 6 panels to calculate the arc length L of a single panel; The calculation formula for 6 wall panels is: ; The calculation formula for 3 wall panels is: L= ; Before welding the cylinder wall, first measure the circumference L1 of the bottom of the box in mm; Reserve the friction stir welding shrinkage L2, in mm; The springback amount L3 caused by turning the excess at the front and rear ends of the cylinder section, in mm; Assembly interference L4, unit: mm.

[0017] Compared with the prior art, the cylinder section friction stir welding near-circular device and method for compensating profile deviation of the present invention has the following advantages: 1. The present invention realizes the functions of synchronous positioning, circumferential / circumferential adjustment, assembly and fixation, and in-situ welding of all cylinder wall panels through a set of tooling with upper and lower inner support conformal rings. The adjustable circumference of the inner support conformal ring effectively ensures that the last wall panel can be smoothly inserted, and takes into account the assembly, welding, and conformal preservation of 3 and 6 wall panels and cylinder sections of different heights.

[0018] 2. The arc length of the cylinder wall panel in the present invention takes into account the coupling factors such as welding shrinkage and cylinder edge springback, and sets the cylinder section welding to be in an interference state with the inner support conformal ring. Through the coordination of product and tooling dimensions, high-precision roundness control is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1It is an overall schematic diagram of a cylinder segment friction stir welding near-circular device for compensating for profile deviation according to an embodiment of the present invention; Figure 2 It is a bottom schematic diagram of the upper inner support shape retaining ring device according to an embodiment of the present invention; Figure 3 It is a schematic diagram of an upper clamping assembly of an upper inner support shape retaining ring device according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the lower inner support shape retaining ring device according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the upper part of the lower inner support shape retaining ring device according to an embodiment of the present invention; Figure 6 A schematic diagram of a base according to an embodiment of the present invention; Figure 7 The six barrel wall panels according to the embodiment of the present invention are assembled and welded (a is assembled, b is after welding); Figure 8 The three barrel section wall panels described in the embodiment of the present invention are assembled and welded (a is assembly, b is after welding).

[0021] Description of reference numerals: 1. Base; 2. Tooling bracket; 3. Upper inner support retaining ring device; 4. Lower inner support retaining ring device; 5. Vertical drive structure; 6. First workbench; 7. Upper inner support adjustment platform; 8. Upper clamping assembly; 9. First drive cylinder; 10. First threaded rod; 11. First sliding block; 12. Second sliding block; 13. First slide rail; 14. Drive motor; 15. Second threaded rod; 16. Third sliding block; 17. Second workbench; 18. Lower inner support adjustment platform; 19. Lower clamping assembly; 20. Second drive cylinder; 21. Third threaded rod; 22. Sixth sliding block; 23. Fourth sliding block; 24. Second slide rail; 25. Third drive cylinder; 26. Cylinder base; 27. Push block; 28. Connecting rod; 29. ​​Rotating plate; 30. First spring; 31. Second spring; 32. Adjustment hole; 33. Ladder; 34. Clamping plate; 35. Fifth sliding block. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] like Figures 1 to 8As shown, a near-circular device for friction stir welding of barrel sections with profile deviation compensation includes a base 1, a tooling bracket 2, an upper inner support shape retaining ring structure, a lower inner support shape retaining ring structure, and a vertical drive structure 5; a plurality of tooling brackets 2 are equidistantly arranged on the base 1 along the circumference, and the upper inner support shape retaining ring structure and the lower inner support shape retaining ring structure are respectively arranged on the upper and lower sides of the tooling bracket 2; the vertical drive structure 5 is arranged on the tooling bracket 2, and the vertical drive structure 5 can drive the upper inner support shape retaining ring structure to move up and down along the tooling bracket 2.

[0025] The upper inner support shape retaining ring structure includes a plurality of upper inner support shape retaining ring devices 3, and the plurality of upper inner support shape retaining ring devices 3 are circumferentially arranged on the tooling bracket 2; the upper inner support shape retaining ring device 3 includes a first workbench 6, an upper inner support adjustment table 7, and an upper clamping assembly 8; the first workbench 6 is slidably arranged on the tooling bracket 2, and the upper inner support adjustment table 7 slides along the first workbench 6 through the first radial driving assembly; a plurality of upper clamping assemblies 8 are circumferentially arranged on the upper inner support adjustment table 7; the end face of the upper inner support adjustment table 7 is arc-shaped.

[0026] The first radial drive assembly includes a first drive cylinder 9, a first threaded rod 10, and a first sliding block 11; the mounting end of the first drive cylinder 9 is arranged on the first workbench 6, and the output end of the first drive cylinder 9 is connected to the first threaded rod 10; the first sliding block 11 is arranged at the bottom of the upper internal support adjustment platform 7, and the first sliding block 11 is threadedly arranged on the first threaded rod 10, and the first drive cylinder 9 can drive the upper internal support adjustment platform 7 to perform radial adjustment; a second sliding block 12 is provided on the upper part of the first workbench 6, and a first slide rail 13 corresponding to the second sliding block 12 is provided on the upper internal support adjustment platform 7.

[0027] The vertical drive structure 5 includes a drive motor 14, a second threaded rod 15, and a third sliding block 16; the mounting end of the drive motor 14 is arranged on the tooling bracket 2, the output end of the drive motor 14 is connected to the second threaded rod 15, and the upper inner support retaining ring structure is threadedly connected to the second threaded rod 15 through the third sliding block 16.

[0028] The lower inner support shape retaining ring structure includes a plurality of lower inner support shape retaining ring devices 4, and the plurality of lower inner support shape retaining ring devices 4 are circumferentially arranged on the tooling bracket 2; the lower inner support shape retaining ring device 4 includes a second workbench 17, a lower inner support adjustment table 18, and a lower clamping assembly 19; the second workbench 17 is slidably arranged on the tooling bracket 2, and the lower inner support adjustment table 18 slides along the second workbench through the second radial drive assembly; a plurality of lower clamping assemblies 19 are circumferentially arranged on the upper inner support adjustment table 7.

[0029] The second radial drive assembly includes a second drive cylinder 20, a third threaded rod 21, and a fourth sliding block 23; the mounting end of the second drive cylinder 20 is arranged on the second workbench 17, and the output end of the second drive cylinder 20 drives the third threaded rod 21 to rotate through a belt, the third threaded rod 21 is installed on the second workbench 17, and the fourth sliding block 23 is arranged at the bottom of the lower inner support adjustment platform 18, and the fourth sliding block 23 is threadedly arranged on the third threaded rod 21. The second drive cylinder 20 can drive the upper inner support adjustment platform 7 to perform radial adjustment; a second slide rail 24 is provided on the upper part of the base 1, and a second slide rail 24 corresponding to the fifth sliding block 35 is provided on the lower inner support adjustment platform 18.

[0030] The upper clamping assembly 8 and the lower clamping assembly 19 both include a third driving cylinder 25, a cylinder base 261, a pushing block 27, a connecting rod 28, a rotating plate 29, and a clamping plate 34; the mounting end of the third cylinder is arranged above the cylinder base 261, the cylinder base 261 is arranged on the upper inner support adjustment platform 7 or the lower inner support adjustment platform 18, and the output end of the third cylinder is connected to the pushing block 27; the sixth sliding block 22 is arranged on both sides of the pushing block 27, and the cylinder base 261 is provided with a slide groove corresponding to the fifth sliding block; the cylinder base 261 is provided with a rotating rod, and the rotating plate 29 is provided with a first movable hole corresponding to the rotating rod, and the rotating rod is arranged on the cylinder base 261: A pulley is provided at one end of the rotating plate 29, and a clamping plate 34 is provided at the other end: the connecting rod 28 is arranged on the cylinder base 261, and a second movable hole is provided on the rotating plate 29, and the connecting rod 28 can pass through the second movable hole, and the rotating plate 29 can slide along the second movable hole. A first spring 30 is provided on both sides of the cylinder base 261, and the end of the first spring 30 is connected to the rotating plate 29; a second spring 31 is provided on the rotating plate 29, and the end of the second spring 31 is connected to the clamping plate 34.

[0031] An adjustment hole 32 is provided on the clamping plate 34 , and a ladder 33 is provided on the tooling bracket 2 .

[0032] A method for preparing a near-circular cylinder segment by friction stir welding based on profile deviation compensation is provided. The near-circular cylinder segment friction stir welding device with profile deviation compensation is used. During welding, the diameter of the inner support conformal ring is adjusted to the inner diameter of the product, and the inner support conformal ring structure and the lower inner support conformal ring structure are used to lock the inner diameter. The wall panel is reserved for welding shrinkage, but the final cylinder segment diameter after welding is smaller than the inner diameter of the product. The total circumference of the cylinder segment is calculated, and then the circumference of the cylinder segment is averaged to 3 or 6 wall panels to calculate the arc length L of a single wall panel. The calculation formula for 6 wall panels is: L= : The calculation formula for 3 wall panels is: L= .

[0033] Before welding the cylinder wall, first measure the circumference L1 of the bottom of the box in mm; Reserve the friction stir welding shrinkage L2, in mm; The springback amount L3 caused by turning the excess at the front and rear ends of the cylinder section, in mm; Assembly interference L4, unit: mm.

[0034] The springback amount L3 caused by turning the excess at the front and rear ends of the cylinder section is 80-120mm, and the assembly interference amount L4 is 3-4mm.

[0035] Embodiment 1: The new generation of manned carrier rocket with 12-20mm thickness and 700-7000mm high barrel section is described. The barrel section is composed of 3 / 6 wall panels, and the wall panels are connected by stir friction welding.

[0036] Cylinder section wall panel assembly conformal tooling: One of the features of this tooling is that all 3 / 6 cylinder section wall panels can be synchronously assembled and fixed on the conformal tooling and then rotated ±360° as a whole to achieve welding of the cylinder section longitudinal seam.

[0037] The upper inner support shape-keeping ring device 3 can move up and down along the tooling bracket 2 when the drive motor 14 reducer drives the upper inner support shape-keeping ring device 3, taking into account the welding shape-keeping of cylinder sections of different heights of 500-7000mm; The lower inner support shape-keeping ring device 4 can move ±20mm in the radial direction based on the inner diameter of the cylinder section Φ4992mm, and the upper inner support shape-keeping ring can move -100-20mm in the radial direction based on Φ4992mm. It is used for assembling the cylinder section wall panels, correcting the roundness through the tightening force, and facilitating the unloading. In particular, the upper and lower inner support shape-keeping rings can ensure that the last wall panel can be put in after adjusting the diameter to greater than Φ4992mm; The upper and lower inner support conformal rings of the welding fixture have the functions of wall panel positioning, clamping, circumferential adjustment, height adjustment, etc., so that when the longitudinal seam welding edge of the cylinder section wall panel is not vertical, it can also be butt-welded with the adjacent wall panel. Figure 1 shown.

[0038] Cylinder circumference control: The upper inner support conformal ring structure is composed of 6 upper inner support conformal ring devices 3, and a welding pad is reserved between each two petals for stir friction welding. One of the advantages of the inner support conformal ring is that the 6-petal structure can take into account the welding of the cylinder sections of 3 and 6 wall panels at the same time; The present application can adjust the radius of each support petal individually to correct the wall panel according to the deviation of the wall panel profile. During welding, the diameter of the inner support conformal ring is adjusted to Φ4992mm and locked, and the wall panel is reserved for welding shrinkage. However, after welding, the final barrel section diameter is less than Φ4992mm. At this time, the wall panel is not completely attached to the inner support conformal ring after being assembled on the conformal tooling. However, as the number of welds increases, the barrel section wall panel and the inner support conformal ring are more and more attached, until the last weld is completed, the barrel section and the inner support conformal ring are tightly attached to play the role of inner support conformal. The assembly and welding of the barrel section wall panel and the attachment to the conformal tooling are shown in the figure. Figure 2 and Figure 3 shown.

[0039] Before welding the barrel section wall panel, first measure the circumference L1 of the transition ring at the bottom of the tank (if it is the middle barrel section of the tank), then reserve the stir friction welding shrinkage L2, the rebound amount L3 caused by the turning allowance at the front and rear ends of the barrel section, and the assembly interference amount L4, calculate the total circumference of the barrel section, and then average the circumference of the barrel section to 3 / 6 of the wall panel to calculate the arc length L of a single wall panel.

[0040] The calculation formula for 6 wall panels is: L= : The calculation formula for 3 wall panels is: L= .

[0041] Among them, L3 needs to be pre-added or pre-subtracted depending on the changes in the rear circumference of the vehicle edge at the front and rear ends of the barrel section.

[0042] Aiming at the roundness control in the welding process of thick long cylinder sections, the present application innovatively proposes a set of high-precision synchronous assembly-welding flexible conformal tooling for cylinder section wall panel profile compensation, and proposes a cylinder section circumference compensation control method that takes conformal consideration into account. After the cylinder section welding is completed, the inner circumference and the inner support conformal ring are in an interference fit state, which achieves the purpose of cylinder section roundness correction and meets the needs of tank annular seam assembly welding.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A near-circular device for friction stir welding of barrel sections with profile deviation compensation, characterized in that: It includes a base, a tooling bracket, an upper inner support shape-keeping ring structure, a lower inner support shape-keeping ring structure, and a vertical drive structure; A plurality of tooling brackets are arranged on the base at equal intervals along the circumference, and an upper inner support shape-retaining ring structure and a lower inner support shape-retaining ring structure are arranged on upper and lower sides of the tooling bracket respectively; The vertical driving structure is arranged on the tooling bracket, and the vertical driving structure can drive the upper inner support shape retaining ring structure to move up and down along the tooling bracket.

2. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 1 is characterized in that: The upper inner support shape-keeping ring structure includes a plurality of upper inner support shape-keeping ring devices, and the plurality of upper inner support shape-keeping ring devices are arranged on the tooling bracket along the circumference; The upper inner support shape retaining ring device comprises a first working table, an upper inner support adjustment table, and an upper clamping assembly; The first workbench is slidably arranged on the tooling bracket, and the upper inner support adjustment platform slides along the first workbench through the first radial driving assembly; A plurality of upper clamping assemblies are arranged on the upper inner support adjustment platform along the circumference; The end surface of the upper inner support adjustment platform is arc-shaped.

3. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 2 is characterized in that: The first radial drive assembly includes a first drive cylinder, a first threaded rod, and a first sliding block; The mounting end of the first driving cylinder is arranged on the first workbench, and the output end of the first driving cylinder is connected to the first threaded rod; The first sliding block is arranged at the bottom of the upper inner support adjustment platform, the first sliding block is threadedly arranged on the first threaded rod, and the first driving cylinder can drive the upper inner support adjustment platform to perform radial adjustment; A second sliding block is arranged on the upper part of the first workbench, and a first sliding rail corresponding to the second sliding block is arranged on the upper inner support adjustment platform.

4. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 1 is characterized in that: The vertical driving structure includes a driving motor, a second threaded rod, and a third sliding block; The mounting end of the driving motor is arranged on the tooling bracket, the output end of the driving motor is connected to the second threaded rod, and the upper inner support shape retaining ring structure is threadedly connected to the second threaded rod through the third sliding block.

5. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 2 is characterized in that: The lower inner support shape-keeping ring structure includes a plurality of lower inner support shape-keeping ring devices, and the plurality of lower inner support shape-keeping ring devices are arranged on the tooling bracket along the circumference; The lower inner support shape retaining ring device comprises a second workbench, a lower inner support adjustment table, and a lower clamping assembly; The second workbench is slidably arranged on the tooling bracket, and the lower inner support adjustment platform slides along the second workbench through the second radial driving assembly; A plurality of lower clamping assemblies are arranged on the upper inner support adjusting platform along the circumference.

6. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 5 is characterized in that: The second radial drive assembly includes a second drive cylinder, a third threaded rod, and a fourth sliding block; The mounting end of the second driving cylinder is arranged on the second workbench, the output end of the second driving cylinder drives the third threaded rod to rotate through a belt, the third threaded rod is arranged on the second workbench, the fourth sliding block is arranged at the bottom of the lower inner support adjustment platform, the fourth sliding block is threadedly arranged on the third threaded rod, and the second driving cylinder can drive the upper inner support adjustment platform to perform radial adjustment; A second slide rail is arranged on the upper part of the base, and a second slide rail corresponding to the fifth slide block is arranged on the lower inner support adjustment platform.

7. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 5 is characterized in that: The upper clamping assembly and the lower clamping assembly both include a third driving cylinder, a cylinder base, a pushing block, a connecting rod, a rotating plate, and a clamping plate; The mounting end of the third cylinder is arranged above the cylinder base, the cylinder base is arranged on the upper inner support adjustment platform or the lower inner support adjustment platform, and the output end of the third cylinder is connected to the push block; Sixth sliding blocks are arranged on both sides of the push block, and a slide groove corresponding to the fifth sliding block is arranged on the cylinder base; A rotating rod is provided on the cylinder base, and a first movable hole corresponding to the rotating rod is provided on the rotating plate. The rotating rod is arranged on the cylinder base: A pulley is provided at one end of the rotating plate and a clamping plate is provided at the other end: The connecting rod is arranged on the cylinder base, and the rotating plate is provided with a second movable hole, the connecting rod can pass through the second movable hole, and the rotating plate can slide along the second movable hole.

8. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 7 is characterized in that: First springs are provided on both sides of the cylinder base, and ends of the first springs are connected to the rotating plate; A second spring is arranged on the rotating plate, and an end of the second spring is connected with the clamping plate.

9. The near-circular device for friction stir welding of barrel sections with profile deviation compensation according to claim 7, characterized in that: The clamping plate is provided with an adjustment hole, and the tooling bracket is provided with a ladder.

10. A method for preparing a near-circular cylinder section by friction stir welding based on profile deviation compensation, using the near-circular cylinder section friction stir welding device with profile deviation compensation according to any one of claims 1 to 9, characterized in that: During welding, the diameter of the inner support conformal ring is adjusted to the inner diameter of the product, and locked by the upper inner support conformal ring structure and the lower inner support conformal ring structure. The wall plate reserves welding shrinkage, but the final cylinder section diameter after welding is smaller than the inner diameter of the product; Calculate the total circumference of the cylinder section, then average the circumference of the cylinder section to 3 or 6 panels to calculate the arc length L of a single panel; The calculation formula for 6 wall panels is: L= ; The calculation formula for 3 wall panels is: L= ; Before welding the cylinder wall, first measure the circumference L1 of the bottom of the box in mm; Reserve the friction stir welding shrinkage L2, in mm; The springback amount L3 caused by turning the excess at the front and rear ends of the cylinder section, in mm; Assembly interference L4, unit: mm.

Images