Technological method for high-precision ultrathin anti-overflow oil pipe of pumped storage unit

Abstract

The invention discloses a process method for a high-precision ultrathin anti-overflow oil pipe of a pumped storage unit, belongs to the field of manufacturing of pumped storage generator motors, realizes an integrated finish machining process for sleeving a main shaft on the high-precision ultrathin anti-overflow oil pipe with the thickness of 20mm, and solves the problem of large welding deformation of the sleeving main shaft after finish machining of the conventional ultrathin anti-overflow oil pipe. The problem that the ultrathin anti-overflow oil pipe is difficult to support and fix on the main shaft body in a sleeving manner is solved, and the problem that the ultrathin anti-overflow oil pipe deforms due to stress concentration during turning is solved. The technological method thoroughly breaks through the technical bottlenecks of low machining precision and oil spill after installation in the prior art, greatly reduces the operation and maintenance cost of a unit in the operation period after installation, achieves the good effect and expectation once and for all, and obviously improves the operation stability of the pumped storage generator motor.

Description

Technical Field

[0001] The invention belongs to the field of pumped storage unit manufacturing, and in particular relates to a manufacturing process method of a high-precision ultra-thin anti-oil overflow pipe. Background Art

[0002] At present, in the processing of ultra-thin anti-oil spill pipes for pumped storage units, most projects adopt the method of processing by dividing the pipe into two pieces to form a whole circle, and then disassemble the pipe after processing, install it on the main shaft body, weld and grind the joint surface. The advantage of this process method is that it is not limited by the main shaft, and the processing of ultra-thin anti-oil spill pipes can be completed with a single piece. The disadvantage is that the processing is completed in one time, and the stress is concentrated. The stress of thin-walled pipe fittings is concentrated, and the deformation is released over time; the ultra-thin anti-oil spill pipe installed on the main shaft body needs to be fully welded with the joint surface groove, and the welding temperature causes secondary deformation. The joint grinding is prone to cause high and low points, resulting in poor roundness and verticality of the ultra-thin anti-oil spill pipe, causing the oil flow in the oil tank to stir, and the risk of overflow is increased. Once the oil tank overflows, it will cause oil pollution in various parts of the stator, rotor, upper and lower guide bearings, and pollute the water source at the same time;

[0003] Therefore, it is of great practical significance to develop a new process method for manufacturing high-precision ultra-thin oil spill prevention pipes to solve the above problems. Summary of the invention

[0004] In order to solve the problems of low machining precision and oil spill during use of the 20 mm thick ultra-thin anti-oil spill pipe of the pumped storage unit, the present invention provides a process method for manufacturing a high-precision ultra-thin anti-oil spill pipe, which is achieved by the following steps:

[0005] S1. Process the two-flange seam surfaces of the ultra-thin oil spill prevention pipe, clamp the semi-finished product of the ultra-thin oil spill prevention pipe in the CNC machining center at equal distances along the X-axis line, and process the semi-finished product of the ultra-thin oil spill prevention pipe at equal distances along the Y-axis line by milling; weld the seam plate at the seam of the ultra-thin oil spill prevention pipe, the seam plate has a center handle hole, and combine the two-flange ultra-thin oil spill prevention pipe into a whole;

[0006] S2. Processing the inner circle and upper end surface of the ultra-thin oil spill prevention pipe to the finished product size, clamping the ultra-thin oil spill prevention pipe in a CNC machining center, and turning the ultra-thin oil spill prevention pipe by turning;

[0007] S3, the three-axis CNC machining center drills and taps 24 threaded holes on the flange of the ultra-thin anti-oil spill pipe that are associated with the generator connection; the CNC machining center drills and taps 10 threaded holes on the wall plate of the small end of the ultra-thin anti-oil spill pipe that are connected to the spindle support;

[0008] S4. Make an ultra-thin anti-oil spill pipe and a main shaft body fixing device, weld a fixing plate and a supporting plate, drill 18 ultra-thin anti-oil spill pipe connection holes on the fixing plate, and drill 9 supporting thread process holes on the supporting plate;

[0009] S5. Ultra-thin anti-oil overflow pipe sleeve and main shaft are welded into a whole: two pieces of ultra-thin anti-oil overflow pipe sleeve are mounted on the main shaft body and assembled into a whole on the shaft body; the support plate of the fixing device is used to support the main shaft body; the groove of the oil retaining pipe parting surface is fully welded, the welding part is polished, and the joint plate is removed;

[0010] S6. Adjust the concentricity between the inner circle of the ultra-thin anti-oil overflow pipe and the main shaft body, and install the supporting bolts of the small end of the ultra-thin anti-oil overflow pipe to firmly support the ultra-thin anti-oil overflow pipe on the main shaft body;

[0011] S7, mounting the generator main shaft with the ultra-thin oil spill prevention pipe on a CNC horizontal lathe, and machining the flange end face, flange outer circle and tube outer circle of the ultra-thin oil spill prevention pipe by turning;

[0012] S8. Remove the wall support of the small end of the ultra-thin oil spill prevention pipe, plug the welding process hole, and polish the weld. After the processing is completed, inspect the finished product.

[0013] In the process method for high-precision ultra-thin anti-oil overflow pipe of the pumped storage unit, in S1, the CNC machining center is a three-axis CNC machining center, the tool used is high-speed steel, the cutting depth is 0.5mm-0.8mm, the feed speed is 20mm / min-40mm / min, and the spindle speed is 650r / min-800r / min.

[0014] In the process method for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit, in S1, combining the two ultra-thin anti-oil overflow pipes into a whole is divided into two steps:

[0015] S11. Grind the surface of the welding area to reveal the metallic luster, weld the joint plate to both sides of the joint of the ultra-thin oil spill prevention pipe, and fillet weld 15mm on three sides using arc welding;

[0016] S12. Install the joint bolts into the joint holes of the paired joint plates and tighten them with nuts. There is no gap on the joint surface and the two halves of the ultra-thin anti-oil overflow pipe are combined into a whole.

[0017] In the process method for high-precision ultra-thin anti-oil overflow pipe of the above-mentioned pumped storage unit, in S2, the CNC machining center is a vertical lathe CNC machining center, the tool used is high-speed steel, the cutting depth is 0.8mm-1.0mm, the feed speed is 30mm / min-50mm / min, and the spindle speed is 350r / min-400r / min.

[0018] In the process method for high-precision ultra-thin oil spill prevention pipe of the pumped storage unit, in S3, drilling and tapping 10 threaded holes for connecting with the main shaft support on the small end tube wall plate of the ultra-thin oil spill prevention pipe is divided into two steps:

[0019] S31. The position size L of the threaded handle hole of the main shaft support is determined by calculating the center of gravity through equal weight balance. The thickness and density of the ultra-thin anti-oil overflow pipe are uniform, which can be calculated by the following formula: ΔG1*ΔL1=ΔG2*ΔL2

[0020] ΔG=ΔV*ρ, ΔV=ΔL*2π*ΔR*σ

[0021] Where: ΔG (ΔG1, ΔG2) is the mass of the ultra-thin anti-oil spill pipe, unit: kilogram; ΔL (ΔL1, ΔL2) is the length dimension of the center of gravity coordinate point, unit: millimeter; ρ is the density of the ultra-thin anti-oil spill pipe steel plate, unit: kg / mm 3 ; ΔV is the volume of the ultra-thin anti-oil spill pipe, unit: mm 3 ; ΔH is the thickness of the ultra-thin anti-oil spill pipe plate, unit: mm; ΔR is the inner hole radius of the ultra-thin anti-oil spill pipe, unit: mm; σ is the thickness of the ultra-thin anti-oil spill pipe plate, unit: mm.

[0022] S32, drilling and tapping CNC machining center is a three-axis CNC machining center. The tools used are high-speed steel twist bottom hole drill bits and high-speed steel machine taps. The cutting feed speed is 30mm / min-50mm / min, and the spindle speed is 450r / min-700r / min.

[0023] In the process method for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit, the manufacturing of the ultra-thin anti-oil overflow pipe and the main shaft body fixing device in S4 is divided into two steps:

[0024] S41, making a fixing plate and a supporting plate;

[0025] S42, welding fixing plates and supporting plates, 9 sets in total;

[0026] S42. Drill two ultra-thin anti-oil overflow pipe connection holes on the fixed plate, and drill one supporting thread process hole on the supporting plate.

[0027] In the process method of the high-precision ultra-thin anti-oil overflow pipe of the pumped storage unit, the main shaft of the S5 ultra-thin anti-oil overflow pipe sleeve is welded into a whole and is divided into the following steps:

[0028] S51, two-piece ultra-thin anti-oil overflow pipe is set on the main shaft body, adjusted to the appropriate position, temporarily supported and fixed to prevent slipping;

[0029] S52. Install the joint bolts into the joint holes of the paired joint plates and tighten them with nuts. There is no gap on the joint surface, and the two ultra-thin anti-oil overflow pipes are combined into a whole.

[0030] S53, supporting the support plate of the fixing device on the main shaft body through the shaft body bolts;

[0031] S54, V-shaped groove full welding in both directions: Welding groove treatment: remove the scale, oil and other harmful impurities within at least 20mm (calculated by the distance from the edge of the groove) on the surface of the groove and the parent material on both sides, and polish to reveal the metallic luster. Preheating temperature: 150℃~230℃, and perform uniform speed welding when the wind speed is less than 6m / s and the relative humidity is less than 85% during manual arc welding;

[0032] S55. After the weld is polished and cleaned, UT and MT inspections are performed, and finally a kerosene leakage inspection is carried out to check the weld quality of the static pressure liquid ultra-thin anti-oil spill pipe.

[0033] In the process method for high-precision ultra-thin oil overflow prevention pipe of the pumped storage unit, the S6 adjusting the concentricity between the inner circle of the ultra-thin oil overflow prevention pipe and the main shaft body is divided into two steps:

[0034] S61, adjust the concentricity between the inner circle of the high-precision ultra-thin anti-oil overflow pipe and the main shaft to 0.02mm;

[0035] S62. Use the barrel support bolts and shaft bolts to support and fix the high-precision ultra-thin anti-oil overflow pipe on the main shaft, and use copper sheet and steel plate to protect the shaft surface.

[0036] In the process method of the high-precision ultra-thin anti-oil overflow pipe of the pumped storage unit, the S7 clamps the spindle with the ultra-thin anti-oil overflow pipe on the CNC horizontal machining center, which is an 18-meter horizontal lathe machining center, and is divided into the following steps:

[0037] S71, the CNC horizontal machining center is selected as an 18-meter horizontal lathe machining center, the tool used is carbide steel, the cutting depth is 0.5mm-0.8mm, the feed speed is 20mm / min-40mm / min, and the spindle speed is 650r / min-800r / min;

[0038] S72, spindle clamping and alignment, frame opening roundness ≤ 0.03mm;

[0039] S73. Rough turning of the flange end face, flange outer circle and tube outer circle of the ultra-thin oil spill prevention pipe. In order to avoid stress concentration and circumferential deformation of the hollow cylinder after turning, static aging for 12 hours is performed to release the stress.

[0040] S74. Fine-turn the flange end face, flange outer circle and tube outer circle of the ultra-thin anti-oil overflow pipe.

[0041] In the process method of the high-precision ultra-thin anti-oil spill pipe of the pumped storage unit, the S8 removes the wall support of the small end of the ultra-thin anti-oil spill pipe, plugs the process hole, and polishes the weld in two steps:

[0042] S81 Remove the supporting bolts of the small end of the ultra-thin oil spill prevention pipe;

[0043] S82 plug welds the supporting thread process holes and polishes the welds.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention proposes a process method for high-precision ultra-thin anti-oil overflow pipes for pumped storage units. The process method realizes the process of fine machining of 20mm thick high-precision ultra-thin anti-oil overflow pipes on the main shaft, solves the problem of large deformation of the main shaft welding after fine machining of ultra-thin anti-oil overflow pipes in the past, solves the problem of difficulty in supporting and fixing the ultra-thin anti-oil overflow pipe sleeves on the main shaft body, and solves the problem of stress concentration deformation of ultra-thin anti-oil overflow pipes during turning. This process method completely breaks through the technical bottlenecks of low machining precision and oil spill after installation of ultra-thin anti-oil overflow pipes in the past, greatly reduces the operation and maintenance costs of the unit during operation after installation, achieves good results and expectations once and for all, and significantly improves the stability of the operation of the pumped storage generator motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of a single piece of the ultra-thin oil spill prevention pipe according to the present invention;

[0047] Figure 2 It is a schematic diagram of the main axis process of the ultra-thin anti-oil spill pipe set of the present invention;

[0048] Figure 3 This is a schematic diagram of the ultra-thin oil spill prevention pipe of the present invention after being assembled and welded;

[0049] Explanation of markings in the figure: 1-ultra-thin anti-oil overflow pipe; 2-main shaft; 3-joining plate; 4-joining bolt; 5-fixing device; 5-1-fixing plate; 5-2-supporting plate; 6-cylinder wall supporting bolt; 7-shaft body bolt; 8-weld. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, further explanation will be given below in conjunction with the accompanying drawings and specific embodiments, but each embodiment does not constitute a limitation of the present invention. The specific embodiments described in the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] Specific implementation method 1: refer to Figure 1 to Figure 2 This embodiment describes a process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit. The process is implemented by the following steps:

[0052] S1, processing the two-flange seam surface of the ultra-thin oil spill prevention pipe 1, clamping the semi-finished product of the ultra-thin oil spill prevention pipe in the CNC machining center at equal distances along the X-axis line, and processing the semi-finished product of the ultra-thin oil spill prevention pipe at equal distances along the Y-axis line by milling; welding the seam plate 3 at the seam of the ultra-thin oil spill prevention pipe, the seam plate has a center handle hole, and combining the two-flange ultra-thin oil spill prevention pipe into a whole;

[0053] S2. Processing the inner circle and upper end surface of the ultra-thin oil spill prevention pipe to the finished product size, clamping the ultra-thin oil spill prevention pipe in a CNC machining center, and turning the ultra-thin oil spill prevention pipe by turning;

[0054] S3, the three-axis CNC machining center drills and taps 24 threaded holes on the flange of the ultra-thin anti-oil spill pipe that are associated with the generator connection; the CNC machining center drills and taps 10 threaded holes on the wall plate of the small end of the ultra-thin anti-oil spill pipe that are connected to the spindle support;

[0055] S4, making an ultra-thin anti-oil overflow pipe and a fixing device 5 for the main shaft 2, welding a fixing plate 5-1 and a supporting plate 5-2, drilling 18 ultra-thin anti-oil overflow pipe connection holes on the fixing plate, and drilling and tapping 9 supporting thread process holes on the supporting plate;

[0056] S5. Ultra-thin anti-oil overflow pipe sleeve and main shaft are welded into a whole: two pieces of ultra-thin anti-oil overflow pipe sleeve are put on the shaft body of the main shaft 2, and assembled into a whole on the shaft body; the support plate 5-2 of the fixing device 5 is used to support the main shaft body; the groove of the oil retaining pipe parting surface is fully welded with weld seam 8, the welding part is polished, and the joint plate 3 is removed;

[0057] S6. Adjust the concentricity between the inner circle of the ultra-thin anti-oil overflow pipe 1 and the shaft body of the main shaft 2, and install the supporting bolts 6 of the small end of the ultra-thin anti-oil overflow pipe to firmly support the ultra-thin anti-oil overflow pipe on the shaft body of the main shaft 2;

[0058] S7, mounting the generator main shaft with the ultra-thin oil spill prevention pipe on a CNC horizontal lathe, and machining the flange end face, flange outer circle and tube outer circle of the ultra-thin oil spill prevention pipe by turning;

[0059] S8. Remove the wall support 6 of the small end of the ultra-thin oil spill prevention pipe, plug the welding process hole, and polish the weld. After the processing is completed, inspect the finished product.

[0060] In this embodiment, a 20mm thick high-precision ultra-thin anti-oil spill pipe set spindle integrated fine processing technology is realized, which solves the problem of large deformation of the spindle welding after the ultra-thin anti-oil spill pipe is finely processed in the past, solves the problem of difficulty in supporting and fixing the ultra-thin anti-oil spill pipe sleeve on the spindle shaft, and solves the problem of stress concentration deformation of the ultra-thin anti-oil spill pipe during turning. This process method completely breaks through the technical bottlenecks of low processing precision of ultra-thin anti-oil spill pipes and oil spill after installation, greatly reduces the operation and maintenance costs of the unit during the operation after installation, achieves a good effect and expectation once and for all, and significantly improves the stability of the operation of the pumped storage generator motor.

[0061] Specific implementation method 2: refer to Figure 1 to Figure 2 To explain this embodiment, this embodiment further limits S1 described in the specific embodiment 1. In this embodiment, the CNC machining center in S1 is a three-axis CNC machining center, the tool used is high-speed steel, the cutting depth is 0.5mm-0.8mm, the feed speed is 20mm / min-40mm / min, and the spindle speed is 650r / min-800r / min.

[0062] In the present embodiment, the two-piece seam surface of the ultra-thin oil spill prevention pipe is processed, and first, all the processed surfaces are checked according to the single-side processing allowance of 3-5mm, and the alignment lines and inspection lines in the X and Y directions are marked. The seam surface of the semi-finished blank of the ultra-thin oil spill prevention pipe is clamped in the CNC machining center at equal distances along the X-axial line facing the axis of the boring spindle of the machining center, and the semi-finished blank of the ultra-thin oil spill prevention pipe is processed at equal distances along the Y-axial line by milling. The feed rate and the boring spindle speed are strictly controlled during milling to reduce the deformation of the ultra-thin oil spill prevention pipe caused by cutting stress.

[0063] Specific implementation method three: refer to Figures 1 to 3 This embodiment is described. This embodiment further limits S1 described in the first embodiment. In this embodiment, the combination of the two-flap ultra-thin oil overflow prevention pipe 1 into a whole in S1 is divided into two steps:

[0064] S11. Grind the surface of the welding area to expose the metallic luster, weld the joint plate 3 to both sides of the joint of the ultra-thin oil spill prevention pipe 1, and perform three-sided fillet welding of 15 mm using arc welding.

[0065] S12. The joint holes of the paired joint plates are installed with the joint bolts 4, which are tightened with nuts. There is no gap on the joint surface, and the two halves of the ultra-thin anti-oil overflow pipe are combined into a whole.

[0066] In this embodiment, the technical key points of welding the joint plates at the joint of the oil spill prevention pipe are: before welding, the two halves of the ultra-thin oil spill prevention pipe are combined, the joint surfaces are free of gaps, the alignment lines are aligned, and the joint plates are welded in pairs.

[0067] Specific implementation method 4: refer to Figure 1 to Figure 2This embodiment is described. This embodiment further limits S2 described in the first embodiment. In this embodiment, the inner circle and the upper end surface of the ultra-thin oil spill prevention pipe are processed to the finished product size in S2, the ultra-thin oil spill prevention pipe is clamped in a CNC machining center, and the ultra-thin oil spill prevention pipe is turned by turning;

[0068] In this embodiment, the inner circle and the upper end surface of the oil spill prevention pipe are cut to the finished size, and then the reference is aligned after the sleeve is placed on the main shaft. The CNC machining center is a vertical lathe CNC machining center, the tool used is high-speed steel, the cutting depth is 0.8mm-1.0mm, the feed speed is 30mm / min-50mm / min, and the spindle speed is 350r / min-400r / min.

[0069] Specific implementation method five: refer to Figure 1 to Figure 2 This embodiment is described. This embodiment further limits S3 described in the first embodiment. In this embodiment, drilling and tapping 10 threaded holes on the wall plate of the small end of the ultra-thin oil spill prevention pipe 1 that are connected to the main shaft support in S3 is divided into two steps:

[0070] S31. The position size L of the threaded handle hole of the main shaft support is determined by calculating the center of gravity through equal weight balance. The thickness and density of the ultra-thin anti-oil overflow pipe are uniform, which can be calculated by the following formula: ΔG1*ΔL1=ΔG2*ΔL2

[0071] ΔG=ΔV*ρ, ΔV=ΔL*2π*ΔR*σ

[0072] Where: ΔG (ΔG1, ΔG2) is the mass of the ultra-thin anti-oil spill pipe, unit: kilogram; ΔL (ΔL1, ΔL2) is the length dimension of the center of gravity coordinate point, unit: millimeter; ρ is the density of the ultra-thin anti-oil spill pipe steel plate, unit: kg / mm 3 ; ΔV is the volume of the ultra-thin anti-oil spill pipe, unit: mm 3 ; ΔH is the thickness of the ultra-thin anti-oil spill pipe plate, unit: mm; ΔR is the inner hole radius of the ultra-thin anti-oil spill pipe, unit: mm; σ is the thickness of the ultra-thin anti-oil spill pipe plate, unit: mm.

[0073] S32, drilling and tapping CNC machining center is a three-axis CNC machining center. The tools used are high-speed steel twist bottom hole drill bits and high-speed steel machine taps. The cutting feed speed is 30mm / min-50mm / min, and the spindle speed is 450r / min-700r / min.

[0074] In this implementation, the key technology is the calculation and determination of the center of gravity of the ultra-thin anti-oil overflow pipe support. The reasonable cylinder wall support position can cooperate well with the end fixing device support to ensure that the turning process is stable and vibration-free, and the cylinder wall is not deformed or tilted.

[0075] Specific implementation method six: refer to Figure 1 to Figure 2 This embodiment is described. This embodiment further limits S4 described in the first embodiment. In this embodiment, the manufacturing of the ultra-thin anti-oil overflow pipe 1 and the main shaft 2 shaft body fixing device in S4 is divided into two steps:

[0076] S41, manufacturing the fixing plate 5-1 and the supporting plate 5-2

[0077] S42, welding the fixing plate 5-1 and the supporting plate 5-2, a total of 9 sets;

[0078] S43. Drill two ultra-thin anti-oil overflow pipe connection holes on the fixed plate 5-1, and drill one supporting thread process hole on the supporting plate 5-2.

[0079] In this embodiment, the fixing device is a tooling for reliably supporting and fixing the oil overflow prevention pipe and the main shaft, which plays a vital role in the stability of the processing after the oil overflow prevention pipe is sleeved on the shaft.

[0080] Specific implementation method seven: refer to Figure 1 to Figure 2 This embodiment is described. This embodiment further limits S5 described in the specific embodiment 1. In this embodiment, the assembly welding of the main shaft of the ultra-thin anti-oil overflow pipe sleeve in S5 into a whole is divided into the following steps:

[0081] S51, two-piece ultra-thin anti-oil overflow pipe 1 is installed on the main shaft 2, adjusted to the appropriate position, and temporarily supported and fixed to prevent slipping;

[0082] S52. Insert the joint bolts 4 into the joint holes of the paired joint plates and tighten them with nuts. There is no gap on the joint surface, and the two halves of the ultra-thin anti-oil overflow pipe are combined into a whole.

[0083] S53, supporting the support plate 5-2 of the fixing device on the main shaft body through the shaft body bolts 7.

[0084] S54, V-shaped groove full welding in both directions: Welding groove treatment: remove the scale, oil and other harmful impurities within at least 20mm (calculated by the distance from the edge of the groove) on the surface of the groove and the parent material on both sides, and polish to reveal the metallic luster. Preheating temperature: 150℃~230℃, and perform uniform speed welding when the wind speed is less than 6m / s and the relative humidity is less than 85% during manual arc welding;

[0085] S55. After the weld is polished and cleaned, UT and MT inspections are performed, and finally a kerosene leakage inspection is carried out to check the weld quality of the static pressure liquid ultra-thin anti-oil spill pipe.

[0086] Specific implementation method eight: refer to Figure 1 to Figure 2 This embodiment is described. This embodiment further limits S6 described in the first embodiment. In this embodiment, S6 adjusts the concentricity between the inner circle of the ultra-thin oil overflow prevention pipe and the main shaft body in two steps:

[0087] S61, adjust the concentricity between the inner circle of the high-precision ultra-thin anti-oil overflow pipe 1 and the main shaft 2 to 0.02mm;

[0088] S62. Use the cylinder wall support bolts 6 and the shaft body bolts 7 to support and fix the high-precision ultra-thin anti-oil overflow pipe 1 on the main shaft body, and use copper sheet and steel plate to protect the shaft body surface.

[0089] In this embodiment, the concentricity between the inner circle of the anti-oil overflow pipe (which has been precision-turned) and the main shaft body is first adjusted to 0.02mm, and then the final fixation and support are performed. Since the main shaft body has been precision-turned, the support bolts need to be equipped with protective pads to protect the shaft body.

[0090] Specific implementation method nine: refer to Figure 1 to Figure 2 To explain this embodiment, this embodiment further limits the S7 described in the specific embodiment 1. In this embodiment, the S7 mounts the spindle 2 equipped with the ultra-thin anti-oil overflow pipe 1 on a CNC horizontal machining center, which is an 18-meter horizontal lathe machining center. The tool used is carbide steel, the cutting depth is 0.5mm-0.8mm, the feed speed is 20mm / min-40mm / min, and the spindle speed is 120r / min-150r / min.

[0091] Specific implementation method ten: refer to Figure 1 to Figure 2 This embodiment is described. This embodiment further limits S7 described in the first embodiment. In this embodiment, S7 processes the flange end face, flange outer circle and tube outer circle of the ultra-thin oil overflow prevention pipe by turning in two steps:

[0092] S71, spindle 2 is installed and aligned, the frame opening round jump is ≤0.03mm;

[0093] S72. Rough turning of the flange end face, flange outer circle and tube outer circle of the ultra-thin oil spill prevention pipe. In order to avoid stress concentration and circumferential deformation of the hollow cylinder after turning, static aging for 12 hours is performed to release the stress;

[0094] S73, finish turning the flange end face, flange outer circle and tube outer circle of the ultra-thin oil overflow prevention pipe 1.

[0095] In this implementation, the technical key points are first to strictly control the spindle speed, ensure that the temperature of the spindle support hydraulic bearing is less than 45°C, control the turning depth value and feed speed, avoid deformation of the anti-oil overflow pipe wall, and after rough machining, ensure sufficient time for aging and stress release, and then perform fine turning to ensure the machining accuracy of the flange end face, flange outer circle and tube outer circle of the anti-oil overflow pipe.

[0096] Specific implementation method eleven: reference Figure 1 to Figure 2This embodiment is described. This embodiment further limits the S8 described in the specific embodiment 1. In this embodiment, the S8 removes the wall support of the small end of the ultra-thin oil spill prevention pipe, plugs the welding process hole, and polishes the weld in two steps:

[0097] S81 removes the support bolts of the small end of the ultra-thin anti-overflow pipe.

[0098] S82 plug welds the supporting thread process holes and polishes the welds.

[0099] In this embodiment, the technical key point is the polishing of the welding area, which needs to ensure that there are no high points or low points, and needs to be ground according to the shape.

[0100] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A process for high-precision ultra-thin anti-oil overflow pipe for pumped storage units. Features: The method is implemented by the following steps: S1, processing the two joint surfaces of the ultra-thin oil spill prevention pipe (1), clamping the semi-finished product of the ultra-thin oil spill prevention pipe in a CNC machining center at equal distances along the X-axis line, and processing the semi-finished product of the ultra-thin oil spill prevention pipe at equal distances along the Y-axis line by milling; welding the joint plate (3) at the joint of the ultra-thin oil spill prevention pipe, the joint plate having a central joint hole, and combining the two halves of the ultra-thin oil spill prevention pipe into a whole; S2. Processing the inner circle and upper end surface of the ultra-thin oil spill prevention pipe to the finished product size, clamping the ultra-thin oil spill prevention pipe in a CNC machining center, and turning the ultra-thin oil spill prevention pipe by turning; S3, the three-axis CNC machining center drills and taps 24 threaded holes on the flange of the ultra-thin anti-oil spill pipe that are associated with the generator connection; the CNC machining center drills and taps 10 threaded holes on the wall plate of the small end of the ultra-thin anti-oil spill pipe that are connected to the spindle support; S4, manufacturing an ultra-thin anti-oil spill pipe and a main shaft (2) shaft body fixing device (5), welding a fixing plate (5-1) and a supporting plate (5-2), drilling 18 ultra-thin anti-oil spill pipe connection holes on the fixing plate, and drilling and tapping 9 supporting thread process holes on the supporting plate; S5. The ultra-thin anti-oil overflow pipe sleeve and the main shaft are welded into a whole: the two halves of the ultra-thin anti-oil overflow pipe sleeve are mounted on the shaft body of the main shaft (2) and assembled into a whole on the shaft body; the support plate (5-2) of the fixing device (5) is used to support the shaft body of the main shaft; the groove of the parting surface of the oil retaining pipe is fully welded with a weld seam (8), the welding part is polished, and the joint plate (3) is removed; S6. Adjust the concentricity between the inner circle of the ultra-thin anti-oil overflow pipe (1) and the shaft body of the main shaft (2), and install the barrel wall support bolts (6) at the small end of the ultra-thin anti-oil overflow pipe to firmly support the ultra-thin anti-oil overflow pipe on the shaft body of the main shaft (2); S7, mounting the generator main shaft with the ultra-thin anti-oil overflow pipe on a CNC horizontal lathe, and machining the flange end face, flange outer circle and tube outer circle of the ultra-thin anti-oil overflow pipe by turning; S8, remove the wall support (6) of the small end of the ultra-thin oil spill prevention pipe, plug the welding process hole, and polish the weld. After the processing is completed, the finished product is tested.

2. According to claim 1, a process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit, Features: In S1, the CNC machining center is a three-axis CNC machining center, the tool used is high-speed steel, the cutting depth is 0.5mm-0.8mm, the feed speed is 20mm / min-40mm / min, and the spindle speed is 650r / min-800r / min.

3. According to claim 1, a process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit, Features: In S1, combining the two ultra-thin oil spill prevention pipes (1) into a whole is divided into two steps: S11, grinding the surface of the welding area to expose the metallic luster, welding the joint plate (3) to both sides of the joint of the ultra-thin oil spill prevention pipe (1), and performing three-sided fillet welding of 15 mm using arc welding; S12. The joint holes of the paired joint plates are installed with the joint bolts (4), which are tightened with nuts. There is no gap between the joint surfaces, and the two halves of the ultra-thin anti-oil overflow pipe are combined into a whole.

4. According to claim 1, a process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit, Features: In S2, the CNC machining center is a vertical lathe CNC machining center, the tool used is high-speed steel, the cutting depth is 0.8mm-1.0mm, the feed speed is 30mm / min-50mm / min, and the spindle speed is 350r / min-400r / min.

5. According to claim 1, a process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit, Features: In S3, drilling and tapping 10 threaded holes on the small end tube wall plate of the ultra-thin oil spill prevention pipe (1) that are connected to the main shaft support is divided into two steps: S31. The size L of the threaded handle hole of the main shaft support is determined by calculating the center of gravity through equal weight balance. The thickness and density of the ultra-thin anti-oil overflow pipe are uniform, which can be calculated by the following formula: ΔG1*ΔL1=ΔG2*ΔL2; ΔG=ΔV*ρ, ΔV=ΔL*2π*ΔR*σ; Where: ΔG (ΔG1, ΔG2) is the mass of the ultra-thin anti-oil spill pipe, unit: kilogram; ΔL (ΔL1, ΔL2) is the length dimension of the center of gravity coordinate point, unit: millimeter; ρ is the density of the ultra-thin anti-oil spill pipe steel plate, unit: kg / mm 3 ; ΔV is the volume of the ultra-thin anti-oil spill pipe, unit: mm 3 ; ΔH is the thickness of the ultra-thin anti-oil spill pipe plate, unit: mm; ΔR is the inner hole radius of the ultra-thin anti-oil spill pipe, unit: mm; σ is the thickness of the ultra-thin anti-oil spill pipe plate, unit: mm; S32, drilling and tapping CNC machining center is a three-axis CNC machining center. The tools used are high-speed steel twist bottom hole drill bits and high-speed steel machine taps. The cutting feed speed is 30mm / min-50mm / min, and the spindle speed is 450r / min-700r / min.

6. The process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit according to claim 1, Features: The manufacturing of the ultra-thin anti-oil overflow pipe (1) and the main shaft (2) shaft body fixing device in S4 is divided into two steps: S41, manufacturing a fixing plate (5-1) and a supporting plate (5-2); S42, welding fixing plate (5-1) and supporting plate (5-2), 9 sets in total; S43, two ultra-thin anti-oil overflow pipe connection holes are drilled on the fixed plate (5-1), and one supporting thread process hole is drilled on the supporting plate (5-2).

7. The process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit according to claim 1, Features: The S5, ultra-thin anti-oil overflow pipe sleeve main shaft assembly welding into a whole is divided into the following steps: S51, two-piece ultra-thin anti-oil overflow pipe (1) is sleeved on the main shaft (2) and adjusted to a proper position, and temporarily supported and fixed to prevent slipping; S52, insert the joint bolts (4) into the joint holes of the paired joint plates, tighten them with nuts, and leave no gap between the joint surfaces. The two halves of the ultra-thin anti-oil overflow pipes are combined into a whole; S53, supporting the support plate (5-2) of the fixing device on the main shaft body through the shaft body bolts (7); S54, V-shaped groove full welding in both directions: Welding groove treatment: remove the oxide scale, oil stains and other harmful impurities within at least 20mm of the groove and the surface of the base material on both sides, calculated by the distance from the edge of the groove, and polish to reveal the metallic luster. Preheating temperature: 150℃~230℃, and perform uniform speed welding when the wind speed is less than 6m / s and the relative humidity is less than 85% during manual arc welding; S55. After the weld is polished and cleaned, UT and MT inspections are performed, and finally a kerosene leakage inspection is carried out to check the weld quality of the static pressure liquid ultra-thin anti-oil spill pipe.

8. The process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit according to claim 1, Features: S6, adjusting the concentricity between the inner circle of the ultra-thin oil spill prevention pipe and the main shaft body is divided into two steps: S61, adjust the concentricity between the inner circle of the high-precision ultra-thin anti-oil overflow pipe (1) and the main shaft (2) to 0.02 mm; S62. Use the barrel wall support bolts (6) and the shaft body bolts (7) to support and fix the high-precision ultra-thin anti-oil overflow pipe (1) on the main shaft body, and use copper sheet and steel plate to protect the shaft body surface.

9. The process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit according to claim 1, Features: The S7, machining the flange end face, flange outer circle and tube outer circle of the ultra-thin oil spill prevention pipe by turning, is divided into two steps: S71, the CNC horizontal machining center is selected as an 18-meter horizontal lathe machining center, the tool used is carbide steel, the cutting depth is 0.5mm-0.8mm, the feed speed is 20mm / min-40mm / min, and the spindle speed is 650r / min-800r / min; S72, spindle (2) is installed and aligned, and the frame opening roundness is ≤ 0.03mm; S73. Rough turning of the flange end face, flange outer circle and tube outer circle of the ultra-thin oil spill prevention pipe. In order to avoid stress concentration and circumferential deformation of the hollow cylinder after turning, static aging for 12 hours is performed to release the stress. S74. Fine-turn the flange end face, flange outer circle and tube outer circle of the ultra-thin oil overflow prevention pipe (1).

10. The process for producing a high-precision ultra-thin anti-oil overflow pipe for a pumped storage unit according to claim 1, Features: In S8, the removal of the wall support of the small end of the ultra-thin oil spill prevention pipe, the plug welding process hole, and the polishing of the weld are divided into two steps: S81 Remove the supporting bolts of the small end of the ultra-thin oil spill prevention pipe; S82 plug welds the supporting thread process holes and polishes the welds.

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