Manufacturing method for split-type main shaft of large-scale through-flow unit

Abstract

The invention relates to the technical field of tubular unit manufacturing, and discloses a manufacturing method for a split type main shaft of a large tubular unit. By controlling the single-piece machining size precision of the water turbine shaft and the generator shaft, the overall precision of the main shaft after shaft coupling is guaranteed. The method comprises the steps that firstly, single-piece finish machining is completed on a generator shaft, then finish machining is completed on the generator side of a water turbine shaft, rough machining is conducted on the water turbine side, a certain allowance is reserved, then the water turbine shaft and the generator shaft are vertically coupled into a whole, the whole coupling of the two shafts is coupled on a large numerical control horizontal lathe to find the swing degree, and the water turbine shaft is subjected to finish machining after swing finding data are qualified. Therefore, the manufacturing of the whole main shaft is completed. The method has the advantages of controllable processing quality, high precision, low cost and the like.

Description

Technical Field

[0001] The invention relates to the technical field of tubular unit manufacturing, and in particular to a method for manufacturing a split main shaft of a large tubular unit. Background Art

[0002] The main shaft is one of the core components of the tubular turbine unit. It can transmit the rotational mechanical energy generated by the turbine runner under the action of water flow to the generator rotor. It is an important connecting component between the turbine and the generator of the tubular turbine unit, and is also an important component for transmitting torque.

[0003] At present, as the capacity of the unit continues to increase, the overall size of the main shaft of the tubular unit is also increasing. The main shaft of the tubular unit is a single shaft structure. In order to reduce the manufacturing cost of the main shaft of a large tubular unit, a new split main shaft of a large tubular turbine unit has been designed, that is, the main shaft is divided into a turbine shaft and a generator shaft. This structure can greatly reduce the manufacturing cost. The turbine shaft and the generator shaft are connected and the torque is transmitted through the coupling bolts. Among them, controlling the manufacturing accuracy of the turbine shaft and the generator shaft is a crucial factor in the main shaft manufacturing. Summary of the invention

[0004] In view of this, the present invention discloses a method for manufacturing a split main shaft of a large-scale tubular unit. The process method controls the single-piece processing dimensional accuracy of the turbine shaft and the generator shaft, thereby ensuring the overall accuracy of the main shaft after the coupling. The technical solution of the present invention is as follows:

[0005] S1. The generator shaft is fully finished and machined, and all dimensions and tolerances of the shaft body meet the requirements of the drawing; after the shaft body is finished, the flange coupling hole is bored, and the dimensions and tolerances of all coupling holes meet the requirements of the drawing.

[0006] S2. Turning of turbine shaft, where all dimensions and tolerances of the shaft on generator side meet the requirements of the drawing, with a 1mm margin on one side of the shaft on turbine side; boring of flange coupling hole after turning, where all dimensions and tolerances of the flange coupling hole on generator side meet the requirements of the drawing, with a 1mm margin on one side of the flange coupling on turbine side, and the tolerances meet the requirements of the drawing.

[0007] S3. The generator shaft and the turbine shaft are vertically coupled and pre-tightened by coupling bolts with a pin-sleeve structure. The gap between the turbine shaft and the generator shaft flange plane is zero.

[0008] S4. After the generator shaft and the turbine shaft are coupled to form a whole, they are hoisted horizontally onto a large CNC vertical lathe for coupling alignment. The circular runout and end face runout values ​​meet the requirements of ANSI / IEEE810.

[0009] S5. After the integral coupling pendulum data of the generator shaft and the turbine shaft are qualified, the remaining margin of the turbine shaft is precision-machined, and the coupling hole of the turbine side flange is precision-bored to complete the manufacturing of the split main shaft of the large-scale cross-flow unit.

[0010] In the above-mentioned large-scale cross-flow unit split main shaft manufacturing method, the S1 also includes the following contents:

[0011] S11. Comprehensively inspect the generator shaft. Based on the inner hole, check that the machining allowance of each part of the generator shaft is not less than 5mm; check that the shape and size of other non-machined surfaces of the generator shaft meet the requirements of the order drawing.

[0012] S12. The generator side flange plane of the generator shaft faces upwards, and the shaft is placed vertically on the CNC vertical lathe. Use a dial indicator to measure the inner hole alignment data to a tolerance of 0.02mm, and align the generator shaft with the machine tool chuck; use a dial indicator to measure the flatness of the flange surface within 0.02mm, and align the generator shaft to be horizontal.

[0013] S13, rough machining the generator shaft generator side shaft body, leaving a machining allowance of 2mm on one side, after UT flaw detection is qualified, assemble the turning tool to turn it over, so that the turbine side flange plane faces upward. Align as described in S12, rough machining the generator shaft turbine side shaft body, leaving a machining allowance of 2mm on one side, and then UT flaw detection.

[0014] S14. Finish machining the turbine side shaft of the generator shaft and sand it, and the size and behavior tolerances must meet the requirements of the drawing; turn the generator shaft over after assembling it with the turning tool, and finish machining the generator side shaft of the generator shaft and sand it, and the size and behavior tolerances must meet the requirements of the drawing.

[0015] S15. After the generator shaft is fully finished, it is hoisted to a large CNC boring machine, and the flange coupling holes on both sides are fine-bored using boring dies. The dimensions and behavior tolerances of all coupling holes meet the requirements of the drawings. The single-piece processing of the generator shaft is completed.

[0016] In the above-mentioned large-scale cross-flow unit split main shaft manufacturing method, the S2 also includes the following contents:

[0017] S21. Perform a comprehensive inspection of the turbine shaft. Based on the inner hole, check that the machining allowance of each part of the turbine shaft is not less than 5mm; check that the shape and size of other non-machined surfaces of the turbine shaft meet the requirements of the order drawing.

[0018] S22. The turbine shaft is hoisted horizontally to a large CNC horizontal lathe, and the outer circle of the turbine end flange is clamped. The center frame is placed on the generator side of the turbine shaft. The dial indicator is used to measure the point data of the inner hole, and the tolerance is 0.02mm. The turbine shaft is aligned with the machine tool chuck; the dial indicator is used to measure the flatness of the generator end flange plane within 0.02mm, and the turbine shaft is aligned horizontally.

[0019] S23. The circular runout of the center frame on both sides of the repaired turbine shaft is not greater than 0.02mm; the turbine shaft is rough-machined, with a machining allowance of 2mm on one side, and the UT flaw detection is qualified.

[0020] S23, fine-tune the center frame on both sides of the turbine shaft, the circular runout is no more than 0.01mm, fine-tune the turbine shaft generator side shaft and sand it, the size and behavior tolerances meet the requirements of the drawing. The generator shaft matching stop and the generator shaft stop are processed according to the actual processing data, and the single-side clearance is 0.01-0.02mm.

[0021] S24. Turn the turbine shaft around and continue turning. Clamp the outer circle of the flange at the generator end of the turbine shaft. Center the turbine shaft on the turbine side. Semi-finish the turbine shaft on the turbine side and leave a 1mm allowance on one side. The size and behavior tolerances meet the requirements of the drawing.

[0022] S25. The turbine shaft is hoisted horizontally to a large CNC boring machine, and the coupling hole of the generator end flange is precision bored using a boring die. The size and tolerance of all coupling holes meet the requirements of the drawing. The coupling hole of the turbine end flange is semi-precision bored using a boring die, leaving a 1mm margin on one side. The size and tolerance of all coupling holes meet the requirements of the drawing, and the single-piece processing of the turbine shaft is completed.

[0023] In the above-mentioned large-scale tubular unit split main shaft manufacturing method, in S3, the generator shaft should be placed vertically on the assembly platform, with the turbine end flange of the generator shaft facing upward, and the turbine shaft and the generator shaft should be assembled vertically, and the gap between the stoppers should be adjusted to be uniform. The coupling bolts and pin sleeves of the two shafts should be assembled, and the bolts should be stretched and pre-tightened in sequence using a hydraulic torque wrench in a point-to-point manner.

[0024] In the above-mentioned large-scale tubular unit split main shaft manufacturing method, the S4 should clamp the generator flange, and the center frame should be used to mount the turbine shaft flange. The dial indicator is used to measure the turbine shaft guide bearing circular surface runout, turbine shaft flange end face runout, generator shaft guide bearing circular surface runout, and generator shaft flange end face runout, and the values ​​must meet the requirements of ANSI / IEEE810.

[0025] In the above-mentioned large-scale tubular unit split main shaft manufacturing method, the S5 also includes the following contents:

[0026] S51. Finish machining and sanding the turbine shaft generator side shaft, and the size and behavior tolerances shall meet the requirements of the drawings.

[0027] S52. The turbine shaft and generator shaft are hoisted as a whole to a large CNC boring machine, and the coupling holes of the turbine end flange are precisely bored using a boring die. The size and behavior tolerances of all coupling holes meet the requirements of the drawings, completing the manufacturing of the split main shaft of the large cross-flow unit.

[0028] Technical Effects

[0029] 1. The present invention firstly performs overall precision turning on the generator shaft body and overall precision boring on the flange coupling hole, so that the single-piece processing size and behavior tolerance of the generator shaft meet the technical requirements of the drawing manufacturing.

[0030] 2. When processing the turbine shaft, the present invention performs fine processing on the generator side shaft body and the coupling hole, and the size and behavior tolerances meet the manufacturing technical requirements of the drawings; the turbine side shaft body and the coupling hole are processed with allowance, so that a certain processing allowance is reserved for the subsequent coupling of the turbine shaft and the generator shaft as a whole during the machine tool coupling adjustment.

[0031] 3. The present invention controls the single-piece finishing dimensions of the turbine shaft and the generator shaft to ensure that the dimensional accuracy and behavioral tolerance of the two shafts after being assembled into a whole meet the technical requirements of the drawings, and the coupling value must meet the requirements of ANSI / IEEE810.

[0032] 4. The present invention is particularly suitable for manufacturing split spindles of large-scale cross-flow units, but it also has great reference value for manufacturing other split spindles, is easy to promote, and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the generator shaft.

[0034] Figure 2 Schematic diagram of the turbine shaft.

[0035] Explanation of the numbers in the figure: 1-generator shaft; 2-turbine shaft. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the examples of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0037] Specific implementation method 1: refer to Figure 1 and Figure 2 The present invention is applied to the main shaft of a large-scale cross-flow unit split main shaft for main shaft processing. The main shaft adopts the structure of generator shaft 1 and turbine shaft 2. The generator shaft 1 and turbine shaft 2 are connected by coupling bolts of pin sleeve structure. The processing method of the stopper of the generator shaft 1 and turbine shaft 2 is matching processing, and the single-side clearance is theoretically 0.01-0.02mm. The method described in the present invention is implemented by the following steps:

[0038] S1. Generator shaft 1 is fully finished and machined, and all dimensions and behavioral tolerances of the shaft body meet the requirements of the drawing; after the shaft body is finished and machined, the flange coupling hole is bored, and the dimensions and behavioral tolerances of all coupling holes meet the requirements of the drawing.

[0039] S2. The turbine shaft 2 is turned, and all dimensions and tolerances of the generator side shaft meet the requirements of the drawing, and a 1mm margin is left on one side of the turbine side shaft; after turning, the flange coupling hole is bored, and the dimensions and tolerances of the generator side flange coupling hole meet the requirements of the drawing, and a 1mm margin is left on one side of the turbine side flange coupling, and the tolerance meets the requirements of the drawing.

[0040] S3. The generator shaft 1 and the turbine shaft 2 are vertically coupled and pre-tightened by coupling bolts with a pin sleeve structure. The gap between the flange planes of the turbine shaft 2 and the generator shaft 1 is zero.

[0041] S4. After the generator shaft 1 and the turbine shaft 2 are coupled to form a whole, they are hoisted horizontally onto a large CNC vertical lathe for coupling alignment. The circular runout and end face runout values ​​meet the requirements of ANSI / IEEE810.

[0042] S5. After the integral coupling pendulum data of generator shaft 1 and turbine shaft 2 are qualified, the remaining margin part of turbine shaft 2 is precision-machined, and the coupling hole of turbine side flange is precision-bored to complete the manufacturing of split main shaft of large cross-flow unit.

[0043] In this embodiment, before the generator shaft 1 and the turbine shaft 2 are coupled as a whole, the generator shaft 1 is fully fine-machined to the drawing size, and the flange coupling holes are all fine-bored to the drawing size. During the processing of the turbine shaft 2, the size of the generator shaft 1 stop is measured, and the stop of the turbine shaft 2 is processed according to a single-side clearance of 0.01-0.02mm. A certain margin is left for the rough machining of the turbine side shaft body and the coupling hole of the turbine shaft 2, which is used for the adjustment of the coupling data after the two shafts are coupled. After the coupling swing data of the turbine shaft 2 and the generator shaft 1 are qualified, the turbine shaft 2 is fine-machined to control the manufacturing accuracy of the main shaft.

[0044] Specific implementation method 2: This implementation method further describes step 1 described in specific implementation method 1. In this implementation method, S1 is divided into five steps:

[0045] S11. Perform a comprehensive inspection of the generator shaft 1. Based on the inner hole, check that the machining allowance of each part of the generator shaft 1 is not less than 5mm; check that the shape and size of other non-machined surfaces of the generator shaft 1 meet the requirements of the order drawing.

[0046] S12, the generator side flange plane of generator shaft 1 faces upward, and the shaft is placed vertically on the CNC vertical lathe. Use a dial indicator to measure the inner hole alignment data to a tolerance of 0.02mm, and align the generator shaft 1 with the machine tool chuck; use a dial indicator to measure the flatness of the upper surface of the flange to within 0.02mm, and align the generator shaft 1 to be horizontal.

[0047] S13, rough machining generator shaft 1 generator side shaft body, leaving a machining allowance of 2mm on one side, after UT flaw detection, assemble the turning tool to turn over, so that the turbine side flange plane faces upward. Align as described in S12, rough machining generator shaft 1 turbine side shaft body, leaving a machining allowance of 2mm on one side, and then UT flaw detection.

[0048] S14. Finish machining the turbine side shaft of generator shaft 1 and sand it, and the size and behavior tolerances shall meet the requirements of the drawing; after the generator shaft 1 is assembled with the turning tool, it shall be turned over, and the generator side shaft of generator shaft 1 shall be finished and sanded, and the size and behavior tolerances shall meet the requirements of the drawing.

[0049] S15, after the generator shaft 1 is fully finished, it is hoisted to a large CNC boring machine, and the flange coupling holes on both sides are finished by boring dies. The dimensions and behavior tolerances of all coupling holes meet the requirements of the drawings. The single-piece processing of the generator shaft 1 is completed.

[0050] In this embodiment, the single-piece machining accuracy of the generator shaft 1 is ensured by accurately aligning the workpiece before turning and machining the coupling hole with a boring die.

[0051] Specific implementation method three: This implementation method further describes step 2 described in specific implementation method one. In this implementation method, S2 is divided into two steps:

[0052] S21. Perform a comprehensive inspection of the turbine shaft 2. Based on the inner hole, check that the machining allowance of each part of the turbine shaft 2 is not less than 5mm; check that the shape and size of other non-machined surfaces of the turbine shaft 2 meet the requirements of the order drawing.

[0053] S22. Hoist the turbine shaft 2 horizontally to the large CNC horizontal lathe, clamp the outer circle of the turbine end flange, and center the turbine shaft 2 on the generator side. Use a dial indicator to measure the inner hole alignment data with a tolerance of 0.02mm, and align the turbine shaft 2 with the machine tool chuck concentrically; use a dial indicator to measure the flatness of the generator end flange plane within 0.02mm, and align the turbine shaft 2 horizontally.

[0054] S23. Repair the center frame on both sides of the turbine shaft 2, the circular runout is not greater than 0.02mm; rough-process the turbine shaft 2, leaving a processing allowance of 2mm on one side, and pass the UT flaw detection.

[0055] S23, fine-tune the center frame on both sides of the turbine shaft 2, the circular runout is no more than 0.01mm, fine-tune the generator side shaft of the turbine shaft 2 and sand it, and the size and behavior tolerances meet the requirements of the drawing. The stopper that matches the generator shaft 1 is processed according to the actual processing data of the stopper of the generator shaft 1, and the single-side clearance is 0.01-0.02mm.

[0056] S24, turn around and continue turning the turbine shaft 2, clamp the outer circle of the flange at the generator end of the turbine shaft 2, center the turbine shaft 2 on the turbine side, semi-finish the turbine shaft 2 on the turbine side and leave a 1mm allowance on one side. The size and behavior tolerances meet the requirements of the drawing.

[0057] S25. The turbine shaft 2 is hoisted horizontally to a large CNC boring machine, and the coupling hole of the generator end flange is precision bored using a boring die. The size and tolerance of all coupling holes meet the requirements of the drawing. The coupling hole of the turbine end flange is semi-precision bored using a boring die, leaving a 1mm margin on one side. The size and tolerance of all coupling holes meet the requirements of the drawing, and the single-piece processing of the turbine shaft 2 is completed.

[0058] In this embodiment, the workpiece is accurately aligned before turning, the turbine shaft is repeatedly turned during processing, and the coupling hole is processed by a boring die to ensure the single-piece processing accuracy of the turbine shaft 2.

[0059] Specific implementation method 4: This implementation method further describes step 3 and step 4 described in specific implementation method 1:

[0060] Place the generator shaft 1 vertically on the assembly platform, with the turbine end flange of the generator shaft 1 facing upwards, and assemble the turbine shaft 2 and the generator shaft 1 vertically, adjusting the gap between the seams to be uniform. Assemble the coupling bolts and pin sleeves of the two shafts, and use a hydraulic torque wrench to pre-tighten the bolts in turn to the theoretical torque value in a point-to-point manner.

[0061] The turbine shaft 2 and the generator shaft 1 are hoisted flat as a whole onto a large CNC horizontal lathe. The mounting method is to clamp the generator flange, and the center frame is used to mount the flange of the turbine shaft 2. The runout of the circular surface of the guide bearing of the turbine shaft 2, the end face runout of the flange of the turbine shaft 2, the circular surface runout of the guide bearing of the generator shaft 1, and the end face runout of the flange of the generator shaft 1 are measured by using a dial indicator. The measured values ​​must meet the requirements of ANSI / IEEE810.

[0062] In this embodiment, the turbine shaft 2 and the generator shaft 1 are assembled into a whole by means of a vertical coupling, the flange planes of the two shafts are pre-tightened by coupling bolts, and the swing of one shaft after the coupling is measured and adjusted on a large CNC horizontal lathe.

[0063] Specific implementation method 5: This implementation method further describes step 5 described in specific implementation method 1:

[0064] S51. Finish machining and sanding the generator side shaft of turbine shaft 2, and ensure that the size and behavior tolerances meet the requirements of the drawing.

[0065] S52, turbine shaft 2 and generator shaft 1 are hoisted as a whole to a large CNC boring machine, and the coupling holes of the turbine end flange are precision bored using a boring die. The size and behavior tolerances of all coupling holes meet the requirements of the drawings, completing the manufacturing of the split main shaft of the large cross-flow unit.

[0066] In this embodiment, after the coupling pendulum data of the turbine shaft 2 and the generator shaft 1 are qualified, the turbine shaft 2 is finely machined and sanded, and the flange coupling hole of the turbine shaft 2 is finely bored, thereby completing the manufacture of the entire main shaft.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it should be clear to those skilled in the art that the technical solutions described in the above embodiments may be modified, or some or all of the technical features therein may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for manufacturing a split spindle of a large-scale tubular unit, characterized in that: The method is implemented by the following steps: S1. The generator shaft (1) is fully finished and machined, and all dimensions and tolerances of the shaft body meet the requirements of the drawing. After the shaft body is finished and machined, the flange coupling hole is bored, and all dimensions and tolerances of the coupling holes meet the requirements of the drawing. S2, turbine shaft (2) turning process, wherein all dimensions and tolerances of the shaft body on the generator side meet the requirements of the drawing, and a 1mm margin is left on one side of the shaft body on the turbine side. After turning process, flange coupling hole boring process is performed, wherein the dimensions and tolerances of the flange coupling hole on the generator side meet the requirements of the drawing, and a 1mm margin is left on one side of the flange coupling on the turbine side, and the tolerances meet the requirements of the drawing; S3, the generator shaft (1) and the turbine shaft (2) are vertically coupled, and the coupling bolts with a pin sleeve structure are used to pre-tighten the coupling bolts, so that the gap between the flange planes of the turbine shaft (2) and the generator shaft (1) is zero; S4. After the generator shaft (1) and the turbine shaft (2) are coupled to form an integral unit, they are hoisted horizontally onto a large CNC vertical lathe for coupling alignment. The circular runout and end face runout values ​​meet the requirements of ANSI / IEEE810. S5. After the integral coupling oscillation data of the generator shaft (1) and the turbine shaft (2) are qualified, the residual portion of the turbine shaft (2) is precision-turned, and the coupling hole of the turbine side flange is precision-bored, thereby completing the manufacturing of the split main shaft of the large-scale cross-flow unit.

2. A method for manufacturing a large-scale cross-flow unit split main shaft according to claim 1, characterized in that: The S1 is divided into five steps: S11. Comprehensively inspect the generator shaft (1): Taking the inner hole as the reference, check that the machining allowance of each part of the generator shaft (1) is not less than 5 mm, and check that the shape and size of other non-machined surfaces of the generator shaft (1) meet the requirements of the order drawing; S12, with the generator side flange plane facing upwards, the generator shaft (1) is placed vertically on a CNC vertical lathe, and a dial indicator is used to measure the inner hole alignment data with a tolerance of 0.02 mm. The generator shaft (1) is aligned to be concentric with the machine chuck, and a dial indicator is used to measure the flatness of the surface on the flange within 0.02 mm, and the generator shaft (1) is aligned to be horizontal; S13, rough machining the generator shaft (1) generator side shaft body, leaving a machining allowance of 2mm on one side, after passing the UT flaw detection, assemble the turning tool to turn it over, so that the flange plane of the turbine side faces upward, align it according to S12, rough machining the generator shaft (1) turbine side shaft body, leaving a machining allowance of 2mm on one side, and then UT flaw detection; S14, finishing the generator shaft (1) and the turbine side shaft body and sanding it, the size and behavior tolerances meet the requirements of the drawing, the generator shaft (1) is assembled with the turning tool and then turned over, finishing the generator shaft (1) and the generator side shaft body and sanding it, the size and behavior tolerances meet the requirements of the drawing; S15. After the generator shaft (1) is fully precision-turned, it is horizontally hoisted to a large CNC boring machine. The flange coupling holes on both sides are precision-bored using boring dies. The dimensions and behavioral tolerances of all coupling holes meet the requirements of the drawings, and the single-piece processing of the generator shaft (1) is completed.

3. The method for manufacturing a large-scale cross-flow unit split main shaft according to claim 1, characterized in that: The S2 is divided into five steps: S21. Comprehensive inspection of the turbine shaft (2): Taking the inner hole as the reference, check that the machining allowance of each part of the turbine shaft (2) is not less than 5 mm, and check that the shape and size of other non-machined surfaces of the turbine shaft (2) meet the requirements of the order drawing; S22, hoist the turbine shaft (2) horizontally to the large CNC horizontal lathe, clamp the outer circle of the turbine end flange, center the turbine shaft (2) on the generator side, use a dial indicator to measure the inner hole alignment data with a tolerance of 0.02mm, align the turbine shaft (2) and the machine tool chuck concentrically, use a dial indicator to measure the flatness of the generator end flange plane within 0.02mm, and align the turbine shaft (2) horizontally; S23, the center frame parts on both sides of the repaired turbine shaft (2) have a circular runout of no more than 0.02mm, the turbine shaft (2) is rough-machined, with a single-side machining allowance of 2mm, and the UT flaw detection is qualified; S23, fine-tune the center frame parts on both sides of the turbine shaft (2), the circular runout is not greater than 0.01mm, fine-tune the generator side shaft of the turbine shaft (2) and sand it, the size and behavior tolerances meet the requirements of the drawing, and the stopper matching the generator shaft (1) is matched with the actual processing data of the stopper of the generator shaft (1), and the single-side clearance is 0.01-0.02mm; S24, the turbine shaft (2) is turned around and the shaft body is further turned, the outer circle of the flange at the generator end of the turbine shaft (2) is clamped, the turbine side of the turbine shaft (2) is center-mounted, and the turbine side of the turbine shaft (2) is semi-finished, leaving a single-side allowance of 1mm, and the size and behavior tolerances meet the requirements of the drawing; S25. The turbine shaft (2) is hoisted horizontally to a large CNC boring machine. The coupling holes of the generator end flange are precision bored using a boring die. The dimensions and tolerances of all coupling holes meet the requirements of the drawing. The coupling holes of the turbine end flange are semi-precision bored using a boring die. A 1mm margin is left on one side. The dimensions and tolerances of all coupling holes meet the requirements of the drawing. The single-piece processing of the turbine shaft (2) is completed.

4. The method for manufacturing a large-scale cross-flow unit split main shaft according to claim 1, characterized in that: In the above-mentioned S3, the generator shaft (1) should be placed vertically on the assembly platform, with the turbine end flange of the generator shaft (1) facing upwards, and the turbine shaft (2) should be vertically suspended and assembled with the generator shaft (1). The gap between the stoppers should be adjusted to be uniform, and the coupling bolts and pin sleeves of the two shafts should be assembled. The bolts should be stretched and pre-tightened in sequence using a hydraulic torque wrench in a point-to-point manner.

5. The method for manufacturing a large-scale tubular unit split main shaft according to claim 1, characterized in that: In the above-mentioned S4, the machine tool should be clamped on the generator shaft (1) and the generator flange, the center frame should be mounted on the turbine shaft (2) flange position, and a dial indicator should be mounted to measure the circular surface runout of the turbine shaft (2), the end face runout of the turbine shaft (2), the circular surface runout of the generator shaft (1), and the end face runout of the generator shaft (1) flange. The values ​​should meet the requirements of ANSI / IEEE810.

6. The method for manufacturing a large-scale cross-flow unit split main shaft according to claim 1, characterized in that: The S5 is divided into two steps: S51, finish machining the turbine shaft (2) and the generator side shaft and sanding them, and the size and behavior tolerances meet the requirements of the drawings; S52, the turbine shaft (2) and the generator shaft (1) are hoisted as a whole to a large CNC boring machine, and the coupling holes of the turbine end flange are precisely bored using a boring die. The dimensions and behavior tolerances of all coupling holes meet the requirements of the drawings, and the manufacturing of the split main shaft of the large cross-flow unit is completed.

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