Method for manufacturing cover cylinder ring of cover cap assembly of heavy gas turbine

Abstract

The invention discloses a method for manufacturing a cover cylinder ring of a heavy gas turbine cover cap assembly. Relates to combustion of gas turbines. The problems of insufficient roundness precision, out-of-control welding deformation and large size discreteness caused by dependence on manual operation of a cover cylinder ring in the prior art are solved. A high-temperature alloy plate is selected and subjected to mechanical leveling, a welding groove and a truncated edge are machined after drawing lofting and laser cutting are conducted, an inner clamping sample plate is adopted to correspond to the curvature R71.3 of a peripheral cover cylinder ring and the curvature R81.55 of a center cover cylinder ring to assist section-by-section edge rolling and radian checking, a welding area is cleaned, positioning spot welding is conducted through a clamp, a double-face symmetric section argon arc welding process is adopted, and the welding quality is improved. And after welding, reinspection is conducted through a special inner clamping sample plate, bulging correction is conducted through matching of a bulging tool and a press machine, the key size is detected through a standard tool, and a batch tracking system is established. The problems that in the cover cylinder ring manufacturing process, procedures are complex, and the roundness precision is insufficient are solved, and the cover cylinder ring structure forming precision and the welding reliability are guaranteed. The method is applied to the field of manufacturing of the cover cylinder ring of the gas turbine cover cap assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine combustion system, in particular to a manufacturing method of a cover cylinder ring of a heavy-duty gas turbine cover cap assembly. BACKGROUND

[0002] In the heavy-duty gas turbine combustion system, the cover cap assembly is the core component for realizing reasonable distribution and isolation of cooling air and combustion area, and directly affects the combustion organization stability and combustion efficiency improvement. As a key structural component of the cover cap assembly, the cover cylinder ring needs to be precisely assembled with the cover cylinder, provides outer edge structural support and sealing positioning for the cover cap diverging panel, ensures accurate formation of the air passage, and meets the sealing compatibility requirements in hot state working, so the dimensional stability, concentricity and surface quality of the cover cylinder ring directly determine the operation reliability of the gas turbine.

[0003] Currently, the cover cylinder ring is mainly manufactured by manual argon arc welding combined with rolling forming process. However, since the cover cylinder ring is a thin-walled high-temperature alloy structural component, and the roundness tolerance requirement is strict (the finished product gap needs to be less than 0.3 mm), the traditional process has significant technical bottlenecks: on the one hand, the rolling process relies on manual experience for judgment, and the curvature is prone to uneven distribution, and the end is prone to excessive deformation or "bell mouth" phenomenon, resulting in excessive gap fluctuation between the cover cylinder ring and the cover cylinder after assembly, which cannot stably meet the sealing requirements, and further affects the air flow organization of the combustion passage; on the other hand, the one-sided or asymmetric manual welding method causes concentrated heat input in the welding area, uneven welding shrinkage, and is prone to problems such as ring distortion, outer diameter deviation exceeding the limit, welding protrusion and local stress concentration, and the post-welding correction space is small, and repeated correction will cause material fatigue and damage to the structure, reducing the service performance of the product; in addition, the type correction process is completed by hand beating or simple pressing, and there is a lack of type correction die and quantitative control means, and the size of the final product is discrete, the batch consistency is poor, and it is difficult to meet the batch production demand. SUMMARY

[0004] In order to solve the problems of insufficient roundness precision, welding deformation out of control and large size discreteness of the cover cylinder ring caused by relying on manual operation in the existing process, a manufacturing method of a cover cylinder ring of a heavy-duty gas turbine cover cap assembly is provided. The method can solve the problems of complex process, unstable welding quality and insufficient roundness precision in the cover cylinder ring manufacturing process, and ensure the forming precision and welding reliability of the cover cylinder ring structure.

[0005] The technical scheme of the present application is as follows:

[0006] A manufacturing method of a cover cylinder ring of a heavy-duty gas turbine cover cap assembly, the method comprising the following steps:

[0007] Step 1: selecting high-temperature alloy sheet and performing mechanical flattening;

[0008] Step 2: laser cutting according to the drawing, processing the welding bevel and the blunt edge;

[0009] Step three: adopt the inner card template to correspond to the outer peripheral cover cylinder ring curvature R71.3, the center cover cylinder ring curvature R81.55, assist the section by section roll circle and check the radian;

[0010] Step four: clean the welding area, and use the fixture to position the spot welding;

[0011] Step five: adopt the double-face symmetry segmented argon arc welding process, control the heat input to avoid uneven welding shrinkage;

[0012] Step six: after welding, recheck through the inner card template, and then expand the forming through the expansion tool and the press machine to ensure that the inner diameter precision is controlled within ±0.1mm;

[0013] Step seven: finish the inner and outer surfaces and remove impurities;

[0014] Step eight: adopt the standard tool to detect the key size, establish the batch tracking system, and realize the quality traceability.

[0015] Further, the high-temperature alloy plate in the step one is GH3536 high-temperature alloy plate, and the thickness is 3mm, the flatness is controlled within 1.5mm after mechanical leveling, and the unqualified plate with scratches and inclusions on the surface is removed.

[0016] Further, the laser cutting process in the step two controls the heat affected zone width, and after cutting, the spatter and slag are polished by an angle grinder, the small hole is finely polished by a hand file, and the cutting edge burrs are fully investigated.

[0017] Further, the welding groove in the step two is 45°, and the blunt edge size is 1mm, the oxide skin is polished after the groove is processed, the groove metal is ensured to be bright, and the flatness is detected.

[0018] Further, the inner card template in the step three is made of GH3536 alloy, the radian is checked once every 50mm during the roll circle process, and the end straight section is adjusted synchronously to ensure the consistency of straightness.

[0019] Further, before the positioning spot welding in the step four, the groove and the range of 30mm on both sides are cleaned by alcohol, the spot welding length is 3-5mm, the interval is 40-60mm, the positioning is compressed by a rigid clamp, and the assembly warping is avoided.

[0020] Further, the welding wire in the step five segmented argon arc welding process is GH3536 welding wire, the diameter is φ1.6mm or φ2.0mm, the welding current is 80-110A, the argon flow is 8-15L / min, the welding sequence is first reverse side and then positive side, the stress concentration is reduced by segmented skip welding.

[0021] Further, the bulging and shaping in step six is cooperated with the pressure machine through the bulging tool, the bulging pressure and stroke are accurately controlled, the inner diameter of the outer peripheral cover cylinder ring reaches 143.4±0.1mm, the inner diameter of the center cover cylinder ring reaches 163.9±0.1mm, and the inner diameter accuracy and roundness of the cover cylinder ring meet the requirements.

[0022] Further, the standard tool in step eight includes an inner diameter micrometer, a roundness gauge and a ruler, detection data is recorded in a batch tracking table in real time, and the whole process quality traceability from raw materials to finished products is realized.

[0023] Compared with the prior art, the present application has the following effects:

[0024] According to the thin-walled curved surface structure characteristics of the cover cylinder ring, the inner clamping template, the outer peripheral cover cylinder ring R71.3 and the center cover cylinder ring R81.55 are used for assisting the roll forming, the arc is checked once every 50mm, the end deformation problem of the traditional free roll forming is effectively avoided, the length and straightness of the end straight section are ensured to be consistent, the inner diameter of the outer peripheral cover cylinder ring is accurately controlled to be 143.4±0.1mm, the inner diameter of the center cover cylinder ring is controlled to be 163.9±0.1mm, the roundness error is greatly reduced, the assembly gap is stably less than 0.3mm, and the sealing and airflow organization requirements are fully met.

[0025] The double-sided symmetric argon arc welding process is adopted, the heat input and welding quality are strictly controlled, the pressure machine and the shaping tool are introduced to implement bulging and shaping, and the final size inner diameter accuracy is ensured to be within ±0.1mm. Especially, the size recording and checking mechanism is added after forming, the batch consistency and quality traceability of the cover cylinder ring are realized. The present application significantly improves the roundness, size stability, shape and position tolerance and assembly adaptability of the cover cylinder ring, and has obvious novelty and engineering application value.

[0026] The present application significantly improves the size consistency of the cover cylinder ring through the standardized lofting and roll forming, symmetric welding, mechanical bulging and roundness correction and data recording process, the assembly gap is stably less than 0.3mm, the welding seam is smooth, the roundness error is obviously reduced, and the deformation control effect is excellent. The process flow has good repeatability, is convenient for batch production, has universality for thin-walled welded curved surface parts, and improves the product precision, durability and assembly reliability.

[0027] The present application standardizes the whole process parameters such as raw material screening, cutting, bevel processing, forming, welding and detection through the standardized process, reduces the dependence on manual experience, significantly reduces the product size dispersion, meets the batch production demand, establishes a batch tracking system, records the key size detection data in a table in real time, realizes the whole process quality traceability from raw materials to finished products, and is convenient for quality control and problem tracing. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1The blanking drawing for the peripheral cover cylinder ring;

[0029] Figure 2 The blanking drawing for the peripheral cover cylinder ring;

[0030] Figure 3 The existing cover cylinder ring expansion tooling drawing;

[0031] In the figure: 1, upper plate, 2, inner hexagonal screw M12*35, 3, wedge block, 4, inner hexagonal screw M8*30, 5, inner expansion block, 6, outer expansion block, 7, ring, 8, guide plate, 9, cylindrical pin, 10, lower plate, 11, guide key, 12, guide key, 13, inner hexagonal screw, 14, stop pin, 15, shaped compression spring, 16, inner hexagonal screw, 17, lifting screw, 18, limit block.

[0032] Figure 4 The structure schematic diagram of the inner clamping template when the curvature of the peripheral cover cylinder ring is R71.3;

[0033] Figure 5 The structure schematic diagram of the inner clamping template when the curvature of the central cover cylinder ring is R81.22; DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application. DETAILED DESCRIPTION

[0036] In combination with Figure 1 Figure 5 The present embodiment is a manufacturing method of a cover cylinder ring of a heavy-duty gas turbine cover cap assembly, which comprises the following steps:

[0037] Step one: select high-temperature alloy plate and perform mechanical leveling, the high-temperature alloy plate is selected to be GH3536 alloy plate with a thickness of 3 mm, and a leveling device is used for mechanical leveling to control the flatness of the plate to be within 1.5 mm. After leveling, check whether there is scratch or inclusion on the surface, and unqualified plate is removed to ensure the consistency of the coiling basis.

[0038] Step two: perform laser cutting according to the unfolded size of the drawing, and control the width of the heat-affected zone. After cutting, use an angle grinder to lightly grind the spatter and slag, use a hand file to finely repair small holes, keep the edge smooth, and do not damage the surface of the base material. Check the burrs of all cutting edges to ensure that there is no stress concentration source during subsequent coiling.

[0039] ​Along the welding side, a 45° bevel with a 1mm root face is processed, and the consistency of the bevel depth and angle is checked. The oxide scale is lightly ground with a grinding wheel to ensure that the bevel metal is bright. After processing, the bevel is wiped with non-woven fabric and the flatness of the bevel is detected.

[0040] Step three: lay out the drawing and make the corresponding inner arc inner clamp sample plate, the outer periphery of the plate is R71.3, and the center cover cylinder ring curvature is R81.55. Put the plate into the roll forming machine and uniformly roll it in sections. Check the arc once every 50mm during the process, especially adjust the end straight section to ensure the length and straightness are consistent.

[0041] Step four: clean the welding area and clamp the positioning spot welding. Specifically, wipe the bevel and 30mm range with alcohol, use platform compression positioning, spot welding to fix the curvature position, spot welding length 3-5mm, spacing about 40-60mm, evenly distributed to avoid warping.

[0042] Step five: adopt double-sided symmetric segmented argon arc welding process, control heat input to avoid uneven weld shrinkage; use GH3536 welding wire Φ1.6 / 2.0, current 80-110A, argon flow rate 8-15 L / min during welding. Perform symmetric welding process: weld the opposite side first and then the positive side, segment skip welding to reduce heat input concentration, and naturally cool after welding. The weld is polished to the same level as the base material and smoothly transitions.

[0043] Step six: after welding, recheck with the inner clamp sample plate to check the arc and end straight section again, and focus on checking the weld area for no distortion and deviation. If necessary, make appropriate mechanical adjustments. Put the piece into the expansion mold and gradually expand it by uniformly pressing with the press to make the cover cylinder ring as a whole. Focus on monitoring the end straightness and inner diameter distribution during the shaping. After shaping, measure the inner diameter, the outer periphery cover cylinder ring is 143.4±0.1mm, and the center cover cylinder ring is 163.9±0.1mm, and record the size.

[0044] Step seven: finish the inner and outer surfaces and remove impurities. Mainly polish the transition area of the inner and outer surfaces to ensure no burrs and sharp corners, and clean the welding slag and residual particles to complete the appearance inspection.

[0045] Step eight: use standard measuring tools to check the roundness, inner diameter, and end straight section length, and record them in the table to form a batch tracking system. Specific implementation method two

[0047] In combination Figure 1 — Figure 5 In this embodiment, the high-temperature alloy plate in step one is GH3536 high-temperature alloy plate with a thickness of 3mm. After mechanical leveling, the flatness is controlled within 1.5mm. Discard the unqualified plate with scratches or inclusions on the surface.

[0048] The plate is mechanically flattened by a flattening device. During the flattening process, uniform pressure is applied to ensure uniform stress on the plate. After flattening, the flatness of the plate is controlled within 1.5 mm, meeting the basic precision requirements of the subsequent coiling process. After flattening, the surface of the plate is checked piece by piece, and unqualified plates with defects such as scratches, inclusions, and excessive scale are removed to avoid defects affecting the subsequent forming and welding quality and ensure the consistency of raw materials in batch production. Specific implementation method three:

[0050] In combination with Figure 1 — Figure 5 To illustrate this embodiment, the manufacturing method of the cover cylinder ring of the heavy-duty gas turbine cover cap assembly in this embodiment controls the heat-affected zone width in the laser cutting process in step two. After cutting, the spatter and slag at the small holes are polished with an angle grinder, and the small holes are finely polished with a hand file. The cutting edges are thoroughly checked for burrs.

[0051] The flattened plate is cut according to the developed dimensions of the center cover cylinder ring and the peripheral cover cylinder ring. After determining the cutting path, the laser cutting process is used. The laser parameters are controlled to limit the width of the heat-affected zone and prevent the edges of the plate from becoming brittle and deformed due to heat.

[0052] After cutting, the spatter and slag at the cut edges are polished with an angle grinder. For small hole structures on the plate, a hand file is used for fine polishing to ensure smooth and accurate dimensions of the inner wall of the small holes. All cutting edges are thoroughly checked for burrs, and the burrs are removed one by one to avoid stress concentration caused by burrs during the coiling process, affecting the forming accuracy of the cover cylinder ring. Specific implementation method four:

[0054] In combination with Figure 1 — Figure 5 To illustrate this embodiment, the manufacturing method of the cover cylinder ring of the heavy-duty gas turbine cover cap assembly in this embodiment uses a 45° welding groove with a 1mm blunt edge size. After groove processing, the oxide scale is polished to ensure that the groove metal is bright and the flatness is detected.

[0055] A 45° welding groove is machined along the welding side of the plate. The blunt edge size of the groove is strictly controlled to be 1mm. During the machining process, an angle ruler and a caliper are used for step-by-step detection to ensure that the groove angle, depth, and blunt edge size are uniform and consistent without deviation. After groove machining, the groove surface and both sides are lightly polished with a fine-grit grinding wheel to completely remove oxide scale, rust, and oil, making the groove metal surface bright and free of impurities.

[0056] Then, clean non-woven fabric is used to wipe the groove and the surrounding area with alcohol. After completion, the groove flatness is detected to ensure that the groove meets the requirements of the welding pool forming, providing protection for the subsequent welding quality. Specific implementation method five:

[0058] In combination Figure 1 — Figure 5 In this embodiment, the manufacturing method of the heavy-duty gas turbine cover cap assembly cover cylinder ring, the inner clamping template in step three is made of GH3536 alloy, and the arc is checked every 50 mm during the rounding process. The end straight section is adjusted synchronously to ensure the consistency of straightness.

[0059] According to the curvature requirement of the cover cylinder ring, the inner clamping template is made in advance. The corresponding template curvature of the peripheral cover cylinder ring is R71.3, and the corresponding template curvature of the center cover cylinder ring is R81.55. The template material is selected as GH3536 alloy consistent with the workpiece to ensure that there is no temperature difference deformation influence during the checking process.

[0060] Put the processed plate into the rounding machine and use the uniform speed rounding method to form. Every 50 mm interval, use the corresponding size of the inner clamping template to check the arc once, and adjust the rounding machine pressure and feeding speed in real time. Focus on precise adjustment of the end straight section of the plate. Through template comparison and ruler measurement, ensure that the end straight section length is consistent and the straightness meets the standard, avoid excessive deformation of the end, and finally make the overall arc of the cover cylinder ring uniform and meet the design requirements. Specific implementation method six:

[0062] In combination Figure 1 — Figure 5 In this embodiment, the manufacturing method of the heavy-duty gas turbine cover cap assembly cover cylinder ring, the positioning spot welding in step four uses alcohol to clean the groove and the area within 30 mm on both sides before welding. The spot welding length is 3-5 mm, and the interval is 40-60 mm. Through rigid clamp compression positioning, avoid assembly warping.

[0063] Before welding, use alcohol to wipe the welding groove and the area within 30 mm on both sides of the groove. Thoroughly remove oil stains, rust and oxides to ensure that the welding area is clean and free of impurities, and prevent defects such as welding pores and slag inclusion.

[0064] Place the rounded plate on the assembly platform and use a rigid clamp to compress and position. Adjust the docking accuracy of the plate interface to avoid opening seams and misalignment.

[0065] After positioning, uniform spot welding is performed. Spot welding uses GH3536 welding wire, and the spot welding length is controlled at 3-5 mm. The spot welding interval is uniformly set at 40-60 mm. The spot welding points are evenly distributed along the interface. Through spot welding arrangement, the assembly rigidity is enhanced to ensure that the parts maintain a stable geometric structure before welding. Specific implementation method seven:

[0067] In combination Figure 1 —Figure 5 This embodiment describes a method for manufacturing a heavy-duty gas turbine cover assembly ring. In step five, the segmented argon arc welding process uses GH3536 welding wire with a diameter of φ1.6mm or φ2.0mm, a welding current of 80-110A, an argon flow rate of 8-15L / min, and a welding sequence of first the reverse side and then the forward side. Segmented skip welding is used to reduce stress concentration.

[0068] The welding process employs double-sided symmetrical manual argon arc welding. Welding parameters are strictly controlled during the process to ensure uniform heat input distribution and avoid deformation caused by localized heat concentration. The welding sequence uses a segmented skip welding method, alternating between segments to reduce welding stress concentration and lower the risk of twisting and deformation of the cover ring. Welding is performed by first welding the reverse side, then the positive side, ensuring complete weld penetration and eliminating defects such as incomplete penetration or lack of fusion.

[0069] After welding, allow the workpiece to cool naturally to room temperature, then use an angle grinder to grind the weld seam so that it is flush with the base material and has a smooth transition, without any weld seam protrusions or depressions, ensuring that the weld seam strength and surface quality are consistent, and at the same time removing residual stress in the weld seam area.

[0070] After the weld seam is ground, the overall curvature and straight sections of the end of the sleeve ring are re-inspected using the inner template, with a focus on checking for any twisting, misalignment, or other deformation in the weld area. During the re-inspection, the fit between the template and the inner arc surface of the sleeve ring is compared point by point. For areas where the fit is not tight or the curvature deviation exceeds the allowable range, appropriate mechanical adjustments are made using correction tools. Adjustments are made gently and slowly to avoid excessive force that could lead to material fatigue or damage, ensuring that the curvature of the sleeve ring meets the design standards and providing a precise foundation for subsequent bulging and straightening processes. Detailed implementation method eight:

[0072] Combination Figure 1 — Figure 5 This embodiment describes a method for manufacturing a cover ring for a heavy-duty gas turbine cover assembly. In step six, during the bulging and straightening process, a bulging tooling and a press are used to precisely control the bulging pressure and stroke, ensuring that the inner diameter of the outer cover ring reaches 143.4±0.1mm and the inner diameter of the central cover ring reaches 163.9±0.1mm, thus ensuring that the inner diameter accuracy and roundness of the cover ring meet the requirements.

[0073] An expansion forming fixture is used for shaping. This fixture includes an inner expansion block 5, an outer expansion block 6, a guide key, a shaping compression spring, a wedge, a guide plate, and a limiting block. A 3mm cylindrical sleeve is placed between the inner expansion block 5 and the outer expansion block assembly 6. Then, the press presses down on the upper plate 1, causing the four inner expansion blocks to expand outwards simultaneously, achieving the expansion forming purpose. The inner expansion block assembly 5 and the outer expansion block assembly 6 can clamp and position the sleeve to be processed, ensuring direct forming by compression molding, preventing deformation during subsequent longitudinal seam welding, and guaranteeing the roundness of the cylinder. Laser welding is used to weld the longitudinal seam.

[0074] The tooling is made of high-strength alloy to ensure no deformation or wear during the forming process. The re-inspected and qualified sleeve ring is smoothly placed into the bulging tooling. After precise positioning, the tooling is connected to the press. The press applies pressure at a uniform speed, causing the inner and outer bulging blocks of the tooling to work synchronously, ensuring the sleeve ring is uniformly shaped. During the forming process, the straightness of the sleeve ring ends and the inner diameter distribution are closely monitored. The press pressure and speed are adjusted in real time to avoid dimensional deviations caused by excessive localized stress. After the bulging forming is completed, the pressure is slowly released, the sleeve ring is removed, and key dimensions are measured and recorded: the inner diameter of the outer sleeve ring is controlled at 143.4±0.1mm, and the inner diameter of the center sleeve ring is controlled at 163.9±0.1mm, ensuring that the inner diameter accuracy meets the design requirements. Specific implementation method nine:

[0076] Combination Figure 1 — Figure 5 This embodiment describes a method for manufacturing a cover ring for a heavy-duty gas turbine cover assembly. The standard tools in step eight include an inside micrometer, a roundness tester, and a ruler. The test data is entered into a batch tracking table in real time to achieve full-process quality traceability from raw materials to finished products.

[0077] After the bulging and shaping are completed, the inner and outer surfaces and transition area of ​​the cover ring are fully finished. Fine-grit grinding wheels are used to grind the inner and outer surfaces, focusing on cleaning residual weld slag, burrs and sharp corners in the welding area to ensure that the inner and outer surfaces are smooth and flawless, without any sharp protrusions or depressions;

[0078] The cover ring undergoes final precision inspection using standard measuring tools. Inspection items include key indicators such as inner diameter, roundness, end straight section length, and weld flatness. The roundness error must meet the requirement of an assembly gap of <0.3mm. During the inspection process, an inside micrometer is used to measure the inner diameter, a roundness meter to check the roundness, and a ruler to check the end straight section length. Inspection data is recorded for each piece to ensure traceability of the dimensional data for every product.

[0079] Products that pass inspection are stored in batches and batch tracking forms are established simultaneously. Detailed information such as raw material information, processing parameters for each process, testing data, and operator information is entered to form a full-process quality traceability system from raw materials to finished products, ensuring the consistency and traceability of mass-produced products.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a cover ring for a heavy-duty gas turbine cover assembly, characterized in that, The method includes the following steps: Step 1: Select high-temperature alloy plates and perform mechanical leveling; Step 2: Lay out the pattern according to the drawings, then laser cut and process the welding bevel and blunt edge; Step 3: Use the inner template to assist in rolling the outer cover ring with a curvature of R71.3 and the central cover ring with a curvature of R81.55, and check the curvature segment by segment. Step 4: Clean the welding area and use a fixture to position and spot weld; Step 5: Use a double-sided symmetrical segmented argon arc welding process to control heat input and avoid uneven weld shrinkage; Step Six: After welding, the inner template is re-inspected, and then the inner diameter is bulged and shaped using a bulging tool and a press to ensure that the inner diameter accuracy is controlled within ±0.1mm. Step 7: Finish the inner and outer surfaces and remove impurities; Step 8: Use standard tools to inspect key dimensions, establish a batch tracking system, and achieve quality traceability.

2. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, The high-temperature alloy plate in step one is GH3536 high-temperature alloy plate with a thickness of 3mm. After mechanical leveling, the flatness is controlled within 1.5mm. Unqualified plates with scratches or inclusions on the surface are removed.

3. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, In step two, the laser cutting process controls the width of the heat-affected zone. After cutting, the spatter and slag are removed by an angle grinder, and the small holes are finely finished by hand filing. All burrs on the cutting edges are thoroughly checked.

4. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, In step two, the welding bevel is 45° with a blunt edge dimension of 1mm. After beveling, the oxide scale is removed by grinding to ensure the bevel metal is bright and the flatness is checked.

5. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, The inner card template in step three is made of GH3536 alloy. During the rolling process, the curvature is checked every 50mm, and the straight section at the end is adjusted synchronously to ensure consistent straightness.

6. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, Before the positioning spot welding in step four, the bevel and the area within 30mm on both sides are cleaned with alcohol. The spot welding length is 3-5mm and the spacing is 40-60mm. The rigid clamp is used to press and position the spot to prevent warping during assembly.

7. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, The welding wire used in the segmented argon arc welding process in step five is GH3536 welding wire with a diameter of φ1.6mm or φ2.0mm. The welding current is 80-110A, the argon flow rate is 8-15L / min, and the welding sequence is first the reverse side and then the forward side. Segmented skip welding is adopted to reduce stress concentration.

8. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, In step six, the bulging and straightening process involves using a bulging tooling and a press to precisely control the bulging pressure and stroke, ensuring that the inner diameter of the outer cover ring reaches 143.4±0.1mm and the inner diameter of the central cover ring reaches 163.9±0.1mm, thus guaranteeing that the inner diameter accuracy and roundness of the cover ring meet the requirements.

9. The method for manufacturing the cover ring of the heavy-duty gas turbine cover assembly according to claim 1, characterized in that, The standard tools in step eight include an inside micrometer, a roundness tester, and a ruler. The test data is entered into the batch tracking table in real time to achieve full-process quality traceability from raw materials to finished products.

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