Titanium alloy rib rapid precise assembly tooling and assembly method

Abstract

The present application belongs to the technical field of titanium alloy assembly tooling, in particular to a titanium alloy rib rapid and accurate assembly tooling and assembly method. In view of the technical problems of low positioning accuracy and difficult control of welding deformation of the existing titanium alloy rib assembly tooling, the following scheme is proposed, including a monolithic annular rigid base. The annular rigid base is a unified reference carrier of the tooling, which is machined after being forged as a whole from 42CrMo alloy steel. The material has high rigidity and strong resistance to welding thermal deformation. The inner circumference of the annular rigid base is precisely turned and finished, and the flatness of the base end face is strictly controlled. The present application can adapt to any outer diameter and any curvature of the annular titanium alloy rib through the circumferential installation position of the adjusting L-shaped positioning block and the replacement of positioning blocks with different arc curvatures. The enterprise does not need to process special tooling for each specification of rib, which reduces the tooling manufacturing investment and saves a large amount of tooling storage space, and adapts to the flexible production mode of multiple specifications and small batches.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy assembly tooling technology, and in particular to a rapid and precise assembly tooling and method for titanium alloy ribs. Background Technology

[0002] Titanium alloy ring T-ribs, or titanium alloy ribs for short, are the core load-bearing reinforcement components of titanium alloy cylinders and pressure tanks. The concentricity, roundness, and contour accuracy of the rib assembly directly determine the overall load-bearing strength and welding quality of the shell. Currently, domestic titanium alloy processing enterprises generally adopt three types of operation modes for the assembly of ring titanium alloy ribs: manual marking and assembly, special fixed tooling, and adjustable bolt locking tooling. All of these have insurmountable technical defects.

[0003] For example, CN109175614A discloses a double-sided double-arc asynchronous welding method for titanium and titanium alloy T-shaped reinforced structures. The method involves pre-welding treatment of the base plate and rib plate of the T-shaped reinforced structure, processing a bevel on the rib plate of the T-shaped reinforced structure, leaving a bevel gap at the welding position, and then simultaneously and asynchronously welding in the same direction on both sides of the bevel. The welding speed is the same, and the welding heat input of the welding gun located at the front of the welding direction is greater than that of the welding gun located at the rear of the welding direction. The titanium and titanium alloy T-shaped reinforced structures manufactured by the double-sided double-arc welding method in this invention can achieve complete penetration of fillet welds, increasing welding efficiency by more than double. Weld porosity and incomplete fusion during welding are effectively controlled and eliminated through preheating of the front gun and post-heating of the rear gun. The assembly of T-shaped ribs in the prior art has the following problems: the rib position is adjusted manually by comparing with steel tape measures and templates, without a unified centering benchmark, resulting in large errors in rib concentricity and roundness, poor consistency of single product dimensions, large fluctuations in mass production quality, and subsequent welding is prone to misalignment and eccentricity defects. Moreover, one set of tooling can only match titanium alloy ribs with a single outer diameter and single curvature. When enterprises produce ribs of multiple specifications and small batches, they need to process multiple sets of tooling separately, resulting in high tooling manufacturing costs. Idle tooling warehousing occupies a lot of space, and tooling replacement and transportation time when changing specifications seriously restricts production capacity. The existing technology does not easily solve these problems. Therefore, there is an urgent need for rapid and accurate assembly tooling and assembly methods for titanium alloy ribs to solve the above problems. Summary of the Invention

[0004] To address the technical problems of low positioning accuracy and difficulty in controlling welding deformation in existing titanium alloy rib assembly tooling, this invention proposes a rapid and precise assembly tooling and method for titanium alloy ribs.

[0005] The present invention proposes a rapid and precise assembly tooling for titanium alloy ribs, including an integral ring rigid base: the ring rigid base is the unified reference carrier of this tooling, and is made of 42CrMo alloy steel integral forging and machining, with high material rigidity and strong resistance to welding heat deformation.

[0006] The inner circumference of the annular rigid base is precision turned and finished. The flatness of the base end face and the roundness of the inner circle are strictly controlled to be ≤0.05mm. The center plane of the geometric center of the base is used as the only unified centering datum for the tooling. The installation position of all L-shaped positioning blocks is calibrated with this datum. From the structural root, the coaxiality of all positioning blocks is guaranteed, eliminating the dimensional errors caused by inconsistent datums in manual assembly.

[0007] L-shaped positioning block: It is a direct positioning and bearing component for the ribs. It adopts an integral milled structure and is divided into a horizontally set support end face and a vertically set limiting end face. The horizontal support end face is used to fully support the lower surface of the annular titanium alloy rib, and the vertical limiting end face fits against the outer arc wall of the rib to achieve radial limiting and prevent the rib from radially sliding and shifting during hoisting and welding.

[0008] To accommodate ribs with different curvatures, the limiting end face can be machined into an arc surface with the corresponding curvature. When producing ribs of different specifications, the positioning block with the matching curvature can be directly replaced. All end faces of the L-shaped positioning block that come into contact with the titanium alloy rib are polished and passivated to eliminate sharp edges and prevent the hard positioning block from scratching or damaging the surface of the softer industrial pure titanium ribs such as TA1 and TA2.

[0009] The present invention preferably uses 12 sets of L-shaped positioning blocks, which are evenly arranged at 360° angles along the inner circumference of the annular base. This provides multi-point uniform support to distribute the weight of the ribs and the welding thermal stress, significantly reducing welding deformation. Each L-shaped positioning block has 2-3 spot welding points on the end face where it contacts the base, and spot welding is used to achieve temporary fixation. No bolts, pressure plates, adjusting screws or other fasteners are required. When it is necessary to change the rib specifications, the positioning blocks can be completely disassembled by grinding away the weld points with an angle grinder. After remarking the points and calibrating, they can be spot welded again for fixation. The tooling can be cyclically adapted to different rib sizes.

[0010] Preferably, the assembly method of the present invention is implemented using the tooling of the above-mentioned 12 sets of L-shaped positioning blocks. The complete process includes six major steps: benchmark calibration, positioning block calibration, spot welding shaping, rib assembly, constraint welding, and tooling reuse. The specific operation process is as follows:

[0011] S1. Reference point calibration: Obtain the outer diameter and outer curvature radius parameters according to the design drawings of the titanium alloy rib to be processed. Take the center plane of the annular rigid base 1 as the centering reference. Mark the installation marking lines of each group of L-shaped positioning blocks on the inner circumference surface at 12 equal angles to ensure that the 12 groups of L-shaped positioning blocks are symmetrically distributed and the enclosing contour matches the outer circle of the rib.

[0012] S2. Positioning block calibration and assembly: Place the L-shaped positioning block 2 that matches the curvature of the ribs at the corresponding marked points. Use an inside micrometer and dial indicator to uniformly calibrate the radial extension and height of all positioning blocks. The calibration standard is that the arc-shaped limiting end face of all positioning blocks forms a standard circular outline, and the coaxiality error is controlled within 0.1mm.

[0013] S3. Spot welding shaping fixture: The L-shaped positioning block and the ring rigid base 1 are connected by low heat input resistance spot welding process. Each positioning block is welded with 2 to 3 welding points. The low heat input process can greatly reduce the heat-affected zone and avoid permanent deformation of the 42CrMo base due to heat. The total time for the entire fixture to calibrate the position and spot weld shaping is no more than 10 minutes. The shaping speed is much faster than the traditional bolt adjustment fixture.

[0014] S4. Titanium alloy rib positioning assembly: The titanium alloy ring rib is smoothly lowered by a crane, so that the bottom of the rib is completely in contact with the horizontal support end face of all L-shaped positioning blocks. The rib is manually fine-tuned to make the outer wall of the rib completely in contact with all arc-shaped limiting end faces. Precise positioning can be completed without additional fastening parts. The positioning operation time for a single rib does not exceed 2 minutes.

[0015] S5. Constrained Welding Formation: The tooling maintains a supporting and limiting state throughout the process. The operator uses argon arc welding to complete the rib splicing assembly welding. 12 points of uniform rigid support constrain the free deformation of the ribs, offsetting the shrinkage stress generated by welding. After the welding is completed and cooled, the overall deformation of the ribs is controlled within 0.2mm.

[0016] S6. Tooling disassembly and reuse: After the ribs have cooled to room temperature, the finished components are lifted out. Use an angle grinder to grind away all the weld points at the bottom of the L-shaped positioning block. The positioning block is completely separated from the base without damage. For the next batch of ribs with different outer diameters and curvatures, repeat the S1 to S3 process to recalibrate, re-calibrate, and spot weld the positioning blocks. The tooling can be disassembled and reused at least 50 times.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. This rapid and precise assembly tooling and method for titanium alloy ribs allows for the adjustment of the circumferential installation position of the L-shaped positioning block and the replacement of positioning blocks with different arc curvatures. A single set of annular bases can accommodate annular titanium alloy ribs of any outer diameter and curvature. Enterprises do not need to process special tooling for each specification of rib, reducing tooling manufacturing investment and saving a lot of tooling storage space. It is suitable for flexible production modes of multiple specifications and small batches.

[0019] 2. This rapid and precise assembly tooling and method for titanium alloy ribs eliminates the need for bolts and screws by using electric welding for fixing. It employs spot welding for rapid shaping, eliminating the need for repeated tightening and loosening of fasteners. The tooling shaping time is ≤10 minutes, and the total assembly time for a single rib is ≤12 minutes. Compared with traditional bolt tooling, this increases production efficiency by more than 60%, effectively shortening the production cycle of a single piece. The L-shaped positioning block is temporarily fixed by spot welding, and the weld points can be ground for non-destructive disassembly. The positioning points can be repeatedly adjusted, and spot welding can be repeated to adapt to different rib specifications. The tooling can be recycled ≥50 times, with no wear and tear on the base body, significantly extending the overall service life of the tooling and reducing the tooling cost per unit.

[0020] 3. The rapid and precise assembly tooling and method for titanium alloy ribs uses the center plane of the precision-machined annular base as a unified centering reference. After calibration of the positioning blocks, the coaxiality error is ≤0.1mm. The roundness and concentricity accuracy of the rib assembly are significantly better than those of manual scribing assembly. The dimensional deviation of the ribs in mass production is stable, eliminating welding defects such as eccentricity and misalignment, and improving the overall assembly interchangeability of the product. The L-shaped positioning block has a smooth and blunt contact end face, without sharp edges or rigid screw extrusion. The entire assembly and welding process will not produce indentations or scratches on the surface of the titanium alloy ribs, eliminating the need for subsequent grinding and surface repair, and improving the first-pass yield of the finished product. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a rapid and precise assembly tooling for titanium alloy ribs proposed in this invention.

[0022] Figure 2 This is a schematic diagram of the support end face and clamping end face structure of a rapid and precise assembly tooling for titanium alloy ribs proposed in this invention.

[0023] In the figure: 1. Annular rigid base; 2. L-shaped positioning block; 21. Support end face; 22. Limiting end face. Detailed Implementation

[0024] Example 1, refer to Figures 1-2 A rapid and precise assembly tooling for titanium alloy ribs is provided. The object to be processed is a TA2 industrial pure titanium ring T-shaped rib (titanium alloy rib), with an outer diameter of 2.5m and an outer curvature radius of 1.2m. The assembly coaxiality error is required to be ≤0.1mm, the overall deformation after welding is required to be ≤0.2mm, and the total assembly time for a single rib is required to be no more than 12min.

[0025] Tooling selection: A 3m outer diameter 42CrMo integral ring rigid base is selected. The flatness of the base end face and the roundness of the inner circle are both precision machined to a tolerance of 0.05mm. It is equipped with 12 blunt arc-shaped L-shaped positioning blocks 2 adapted to a curvature radius of 1.2m.

[0026] Complete pairing operation steps:

[0027] Reference point calibration: Using the center plane of the annular rigid base 1 as the centering reference, mark 12 sets of L-shaped positioning block 2 installation lines on the inner circumference of the annular rigid base 1 at 30° intervals. The 12 sets of points are symmetrically and evenly distributed along the circumference.

[0028] Positioning block calibration assembly: Place the L-shaped positioning blocks 2 with matching curvature to the marked lines, and use a dial indicator to calibrate the radial extension dimension of each block. After calibration, check that the coaxiality error of the limiting end face 22 of all L-shaped positioning blocks 2 is 0.08mm, which meets the process standard of ≤0.1mm.

[0029] Spot welding shaping fixture: Low heat input manual spot welding is used. Each L-shaped positioning block 2 is welded with 3 weld points. The total time for the entire fixture calibration and spot welding shaping is 8 minutes. After welding, the ring rigid base 1 is tested and found to have no thermal deformation.

[0030] Titanium alloy rib positioning assembly: The overhead crane hoisted the TA2 titanium alloy rib and smoothly placed it onto the support end face of the L-shaped positioning block 2. The rib position was slightly adjusted so that the outer wall completely fit the arc-shaped limiting end face 2. The positioning operation took 2 minutes.

[0031] Constrained welding forming: The tooling maintains the support and limit, and the rib splice is welded by argon arc welding with a welding current of 120A and a welding travel speed of 8cm / min. After the welding is completed and naturally cooled, the overall deformation of the rib is 0.15mm, which meets the control requirement of ≤0.2mm. There are no indentations or scratches on the outer wall of the rib.

[0032] Tooling disassembly and reuse: After the finished rib is lifted out, all the welding points of the positioning blocks are ground and removed by an angle grinder. The 12 L-shaped positioning blocks 2 are completely disassembled. The positioning blocks are undeformed and undamaged. The points can be recalibrated to adapt to other titanium alloy ribs with different diameters and curvatures. The entire tooling can be reused a total of 52 times.

[0033] Example 2, refer to Figures 1-2 A rapid and precise assembly tooling for titanium alloy ribs is provided. The object to be processed is a small TA1 pure titanium ring-shaped T-rib (titanium alloy rib), with an outer diameter of 1.2m and an outer curvature radius of 0.6m. The process requirements are: the coaxiality error of the assembly is ≤0.1mm, the overall deformation of the rib after welding and cooling is ≤0.2mm, and the total time for assembling a single complete piece is ≤12min.

[0034] tooling configuration

[0035] An integral ring-shaped rigid base with an outer diameter of 1.8m is selected. The material is 42CrMo alloy steel. The base is precision machined as a whole. The flatness of the end face and the roundness of the inner circle are controlled to 0.05mm. It is equipped with 12 arc-shaped L-shaped positioning blocks 2 with a curvature radius of 0.6m. All L-shaped positioning blocks 2 and the contact surface with the titanium material are polished, passivated and deburred.

[0036] Specific steps for pairing operations:

[0037] The reference point is calibrated with the geometric center plane of the annular rigid base 1 as the unified centering reference. The 360° circumference of the inner circle of the base is divided into 12 installation marking lines at 30° intervals. The 12 sets of marking points are symmetrically distributed at equal angles to define the installation position of the L-shaped positioning block 2 and match the outer circle contour of the 1.2m outer diameter rib.

[0038] The positioning block calibration assembly places L-shaped positioning blocks 2 with a curvature of 0.6m one by one on the marked points. Using a dial indicator and an inside micrometer, the radial extension distance and support height of each positioning block are calibrated. After calibration, the coaxiality error of the circular contour formed by the arc-shaped limiting end faces 22 of the 12 L-shaped positioning blocks 22 is 0.07mm, which meets the accuracy index of ≤0.1mm.

[0039] The low heat input spot welding shaping fixture uses manual resistance spot welding to fix each L-shaped positioning block 2. Two spot welding points are set on the end face of each L-shaped positioning block 2 that is in contact with the base. The welding heat input is controlled throughout the process to avoid thermal deformation of the base. The entire fixture point calibration and spot welding shaping takes a total of 7 minutes. After shaping, the roundness of the base is re-measured and there is no deviation.

[0040] The small titanium alloy ribs are hoisted and positioned using a small cantilever crane, which smoothly lowers them to the horizontal support end face 21 of all L-shaped positioning blocks 2. The ribs are slightly rotated and adjusted so that the outer wall of the ribs is completely in contact with the arc-shaped limiting end face 21 of the 12 L-shaped positioning blocks 2, without gaps or local suspension. The positioning operation takes only 1.5 minutes.

[0041] Under the constraint of the tooling, the welding forming tooling maintains a rigid support and limit state throughout the process. The rib splicing weld is completed by pulse argon arc welding with a welding current of 90A and a welding travel speed of 7cm / min. During the welding process, multiple points are evenly supported to disperse thermal stress, and there is no local warping. After the workpiece is naturally cooled to room temperature, it is tested. The overall deformation of the rib is only 0.12mm, which is less than the limit of 0.2mm. There are no indentations, scratches, or bumps on the outer surface of the rib.

[0042] After the tooling is disassembled and reused to remove the finished rib, an angle grinder is used to grind and remove all spot welds on the bottom of the positioning blocks. All 12 L-shaped positioning blocks are completely disassembled without deformation or wear. The positioning blocks can be recalibrated and replaced with positioning blocks of different curvatures. It is compatible with titanium alloy ribs of any specification with an outer diameter of 0.8m-3m. The tooling can be reused a total of 55 times.

[0043] Example 3, refer to Figures 1-2A rapid and precise assembly tooling for titanium alloy ribs is provided. The object being processed is a TA2 titanium alloy thick-walled T-shaped ring rib with an outer diameter of 3.6m, an outer curvature radius of 1.8m, and a rib plate thickness of 12mm. The process hard indicators are: assembly coaxiality error ≤0.1mm, overall deformation after welding ≤0.2mm, and assembly time for a single complete rib ≤12min.

[0044] tooling and equipment configuration

[0045] Annular rigid base: It is made of 42CrMo alloy steel forging with an outer diameter of 4.2m and machined. The flatness of the end face and the roundness of the inner circle of the base are precision machined to a tolerance of 0.05mm. It has sufficient rigidity and can bear the weight of the thick-walled large-size titanium alloy ribs.

[0046] There are a total of 12 L-shaped positioning blocks 2, and the limiting end face 22 is machined into an arc-shaped fitting surface with a curvature radius of 1.8m. All surfaces in contact with the titanium alloy are mirror-polished and passivated. Each positioning block is thickened and reinforced to fit the thick-walled ribs for load bearing.

[0047] Complete operation steps

[0048] The reference point is calibrated with the central plane of the annular rigid base 1 as the unified centering reference. Twelve installation points are evenly divided along the inner circle of the base in 360°, with adjacent points spaced 30° apart. Markings are made on the inner circumference to ensure that the L-shaped positioning blocks 2 are symmetrically arranged and the enclosing contour matches the outer circle of the 3.6m rib.

[0049] The thickened L-shaped positioning block 2, which is adapted to a curvature of 1.8m, is placed at the marked line for calibration and placement. The radial extension and support height are calibrated one by one using a dial indicator and an inner diameter gauge. After calibration, the coaxiality error of the arc limit 22 surfaces of all L-shaped positioning blocks 2 is 0.09mm, which meets the accuracy requirement of ≤0.1mm.

[0050] For low heat input spot welding shaping, three spot welding points are arranged on the end face of each L-shaped positioning block 2 and the ring rigid base 1. Low current spot welding is used to reduce heat impact. The total time for the entire tooling point calibration and spot welding shaping is 9 minutes. After shaping, the roundness of the base is re-measured and there is no heat deformation.

[0051] The 3.6m thick-walled rib was hoisted and positioned using a crane and flexible lifting tools. It was then placed smoothly on the horizontal support end face 21 of 12 sets of L-shaped positioning blocks 2. The rib was finely adjusted to ensure that the outer wall was tightly fitted with all the arc-shaped limiting end faces 22, without any suspension or offset. The positioning operation took 2 minutes.

[0052] The constrained welding forming fixture maintains rigid multi-point support and limit throughout the process. Argon arc welding is used with a welding current of 140A and a welding speed of 7.5cm / min. The 12 uniform supports effectively offset the shrinkage stress of the thick-walled titanium alloy during welding. After the workpiece is naturally cooled to room temperature, the overall deformation of the rib is 0.18mm, which does not exceed the limit of 0.2mm. There are no pressure marks or scratches on the outer surface of the rib.

[0053] After the tooling is disassembled and reused, the finished product is lifted out. An angle grinder is used to grind away all the weld points of the L-shaped positioning blocks 2. All 12 L-shaped positioning blocks 2 are completely disassembled. The L-shaped positioning blocks 2 have intact structures without bending or wear. They can be replaced with L-shaped positioning blocks 2 with different curvatures and the points can be recalibrated. They are compatible with the full range of titanium alloy ribs from 0.8m to 3.6m. The tooling can be reused 53 times.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rapid and precise assembly fixture for titanium alloy ribs, comprising an annular rigid base (1) and an L-shaped positioning block (2), characterized in that, Multiple sets of L-shaped positioning blocks (2) are provided. The multiple sets of L-shaped positioning blocks (2) are evenly distributed at equal angles along the inner circumference of the annular rigid base (1). The L-shaped positioning blocks (2) are fixed to the preset installation points on the inner circumference of the annular rigid base (1) by spot welding. The L-shaped positioning blocks (2) surround and form a circular limiting contour that fits the titanium alloy rib to be processed. The central plane of the annular rigid base (1) is a unified centering reference plane, which is used to constrain the installation coaxiality of all L-shaped positioning blocks (2) and realize the high-precision assembly and positioning of the titanium alloy rib.

2. The rapid and precise assembly tooling for titanium alloy ribs according to claim 1, characterized in that, The annular rigid base (1) is integrally machined from 42CrMo alloy steel; The inner circumference of the annular rigid base (1) is the precision machining reference surface. The flatness tolerance of the base end face and the roundness tolerance of the inner circle are both no greater than 0.05mm.

3. The rapid and precise assembly fixture for titanium alloy ribs according to claim 1, characterized in that, The L-shaped positioning block (2) is an integrally formed structure, including a horizontally arranged support end face (21) and a vertically arranged limiting end face (22). The supporting end face (21) is used to support the bottom of the titanium alloy rib, and the limiting end face (22) fits against the outer wall of the titanium alloy rib to achieve radial anti-displacement limiting.

4. The rapid and precise assembly fixture for titanium alloy ribs according to claim 3, characterized in that, The limiting end face (22) is adapted to the arc surface of the outer contour of the titanium alloy rib. Titanium alloy ribs with different curvature specifications are matched with L-shaped positioning blocks (2) of corresponding arc size. The end face of the L-shaped positioning block (2) in contact with the titanium alloy rib is smoothed and passivated.

5. The rapid and precise assembly tooling for titanium alloy ribs according to claim 4, characterized in that, The limiting end face (22) is an arc-shaped surface that adapts to the outer contour of the titanium alloy rib. Titanium alloy ribs with different curvature specifications are matched with L-shaped positioning blocks (2) of corresponding arc size. The end faces of the L-shaped positioning blocks (2) that contact the titanium alloy ribs are all smoothed and passivated.

6. The rapid and precise assembly fixture for titanium alloy ribs according to claim 1, characterized in that, The L-shaped positioning block (2) is separated from the annular rigid base (1) by grinding the welding points. After removal, the L-shaped positioning block (2) is readjusted and fixed by spot welding again.

7. A method for rapid and precise assembly of titanium alloy ribs, using a rapid and precise assembly tooling for titanium alloy ribs as described in any one of claims 1-6, characterized in that, The steps are as follows: S1. Reference point calibration: Obtain the outer diameter and curvature parameters of the titanium alloy ribs to be assembled, and use the center plane of the annular rigid base (1) as the centering reference. Mark all the symmetrical installation points of the L-shaped positioning blocks (2) on the inner circumference of the annular rigid base (1). S2, Positioning block calibration and assembly: Place the L-shaped positioning block (2) to the marked point, and uniformly calibrate the height and radial extension dimension of all L-shaped positioning blocks (2) so that the limiting end face (22) of all L-shaped positioning blocks (2) can be enclosed to form a standard circular outline, ensuring that the coaxiality meets the process requirements; S3, Spot welding shaping fixture: Using low heat input spot welding process, all L-shaped positioning blocks (2) that have been calibrated are spot welded and fixed on the ring rigid base to complete the overall rapid shaping of the fixture; S4. Titanium alloy rib positioning assembly: The hoisted titanium alloy ribs are placed on the support end face (21) of all L-shaped positioning blocks (2), so that the outer wall of the ribs is completely in contact with the arc-shaped limiting end face (22) of the L-shaped positioning block (2), thus completing the precise positioning of the ribs. S5, Constrained Welding Forming: The tooling maintains the support and limit state, and completes the assembly welding of the titanium alloy ribs. The rigid constraint of the annular rigid base (1) and the L-shaped positioning block (2) suppresses the welding thermal deformation. S6. Tooling disassembly and reuse: After the workpiece is cooled, the formed rib is removed, the weld points between the L-shaped positioning block (2) and the base are ground and removed, the L-shaped positioning block (2) is removed, the points are recalibrated and the L-shaped positioning block (2) is spot welded according to the specifications of the next batch of ribs, and the tooling is put into use again.

8. The method for rapid and precise assembly of titanium alloy ribs according to claim 7, characterized in that, In step S2, with the centering reference plane of the annular rigid base (1) as a reference, the coaxiality error of the limiting end face (22) of all L-shaped positioning blocks (2) after calibration is ≤0.1mm.

9. The method for rapid and precise assembly of titanium alloy ribs according to claim 1, characterized in that, The S3 spot welding shaping process adopts low heat input spot welding to control the welding heat-affected zone to prevent thermal deformation of the annular rigid base (1). The overall shaping time of a single set of tooling does not exceed 10 minutes, and the total assembly time of a single titanium alloy rib does not exceed 12 minutes.

10. A method for rapid and precise assembly of titanium alloy ribs according to claim 1, characterized in that, After welding in step S5, the overall deformation of the titanium alloy rib is ≤0.2mm, and the tooling can be repeatedly disassembled and reassembled, and spot-welded to adapt to different specifications of ribs for a cycle of no less than 50 times.

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