Pumped storage power station ball valve body and valve combination machining process

Abstract

The invention discloses a pumped storage power station ball valve body and valve combination machining process which comprises the following steps: 1, a part pretreatment and assembly welding step: rough machining is carried out on each surface of a lower valve body and an upper valve body, and high-temperature coating is sprayed on the inner wall of the lower valve body and the upper valve body; then the valve is installed between the lower valve body and the upper valve body, a plurality of fixing devices are used for pre-fixing the valve, then welding is conducted according to the preset position, annealing heat treatment is conducted after welding, flaw detection is conducted, and the next procedure is conducted after flaw detection is qualified; and S2, the positions of the valve and the valve body are adjusted and fixed. Through fine design and strict control of all machining procedures, the machining precision of the valve body and the valve is ensured, the assembling quality of the valve body and the valve is improved, and therefore the overall sealing performance, operation flexibility and running reliability of the ball valve are improved, and the use requirement of a pumped storage power station under the complex working condition is met.

Description

Technical Field

[0001] The invention relates to the technical field of pumped storage power station equipment manufacturing, in particular to a pumped storage power station ball valve body valve assembly processing technology. Background Art

[0002] With the continuous adjustment of energy structure, pumped storage power station, as an important energy storage method, plays an increasingly critical role in the power system. As a key device for controlling water flow in pumped storage power station, the quality of the valve body and valve directly affects the performance of the ball valve. In traditional processing technology, the processing of ball valve body and valve often has the following deficiencies:

[0003] On the one hand, when the components are assembled after being processed separately, due to the accumulation of processing errors, it is difficult to ensure the sealing performance between the valve and the valve body, the coaxiality of the shaft hole and the shaft, and the accuracy of the relative positions of the components, which can easily lead to leakage, sticking and other faults in the ball valve during operation, affecting the normal operation of the pumped-storage power station.

[0004] On the other hand, the lack of a systematic and efficient combined processing technology makes the processing procedures cumbersome and the processing cycle long, which increases production costs and is not conducive to ensuring the consistency of product quality.

[0005] Therefore, it is necessary to design a combined processing technology for the valve body and valve of a pumped storage power station ball valve to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings existing in the prior art, and proposes a combined processing technology for the valve body and valve of a pumped-storage power station ball valve. Through the fine design and strict control of each processing procedure, the processing accuracy of the valve body and the valve is ensured, and the assembly quality of the two is improved, thereby improving the overall sealing, operational flexibility and operating reliability of the ball valve, and meeting the use requirements of the pumped-storage power station under complex working conditions.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A combined processing technology for a ball valve body and a valve of a pumped storage power station comprises the following steps:

[0009] S1: Component pretreatment and assembly welding steps: Roughly process the surfaces of the lower valve body and the upper valve body, and spray high-temperature paint on the inner wall; then install the valve between the lower valve body and the upper valve body, weld according to the predetermined position, anneal and heat treat after welding, and then pass the flaw detection. After passing the flaw detection, proceed to the next step;

[0010] S2: Steps for adjusting and fixing the position of the valve and the valve body: adjust the welded valve to the closed position, use the measuring instrument to accurately measure the relative position of the valve sealing surface to the upstream and downstream sides of the valve body stop position and make them the same, then install the expansion sleeves at the upper and lower valve shaft processing positions, after the position is adjusted in place, use the locking device to lock the expansion sleeves at the upper and lower valve shafts, and weld and fix the upstream and downstream valve water outlets with pads respectively;

[0011] S3: Boring and milling processing steps: Use the jig to load the fixed workpiece onto the boring and milling machine workbench, adjust the workpiece position according to the set processing coordinate system and positioning reference, remove the expansion sleeve at the lower valve shaft, install the special boring tool jig, use the jig to perform boring and milling processing on the valve shaft, the shaft hole in the valve body and the valve body plane in turn, then change the tool to process the outer diameter of the valve shaft, after the first round of boring and milling processing is qualified, reinstall the disassembled expansion sleeve at the lower valve shaft, remove the expansion sleeve at the upper valve shaft, operate the boring machine jig rotation, and perform the above-mentioned boring and milling processing and hole drilling and valve shaft outer diameter processing operations again;

[0012] S4: Valve body support and related hole processing steps: After the second round of boring and milling inspection is qualified, install the expansion sleeve at the upper valve shaft, operate the boring machine table to rotate, use the milling cutter to mill the plane processing of the valve body support foot, and bore the anchor bolt hole at the same time;

[0013] S5: Internal channel processing steps: Rotate the boring machine table according to the design drawing, adjust the workpiece to a position suitable for boring the valve oil inlet hole, drain hole and exhaust hole, and use a boring tool to bore these internal channels;

[0014] S6: Vertical lathe processing steps: remove the upper side pad, turn over and remove the side pad, turn the valve to the closed position, fix the valve shaft and clamp the workpiece to the vertical lathe;

[0015] S7: Drilling and subsequent processing steps: Drill holes on all sides of the valve body and valve, and perform comprehensive cleaning and deburring after drilling.

[0016] Preferably, in the component pretreatment and assembly welding steps, the dimensional margin of each surface of the valve body after rough machining is controlled within the range of 3-10 mm, the spray thickness of the high-temperature coating is 0.2-0.6 mm, the welding current in the welding process parameters is controlled within the range of 100-180 A, the voltage is controlled within the range of 20-28 V, the welding speed is controlled within the range of 5-15 mm / min, the annealing temperature is set within the range of 550°C-700°C, the holding time is 1.5-3.5 hours, the cooling rate is 10-30°C / hour, and the sensitivity of the flaw detection is not lower than the minimum sensitivity specified in the corresponding flaw detection standard.

[0017] Preferably, in the steps of adjusting and fixing the position of the valve and the valve body, the measuring instrument is a three-coordinate measuring instrument, the relative position error from the sealing surface of the valve to the upstream and downstream sides of the stop position of the valve body is controlled within ±0.1mm, the locking device is a locking nut with a scale indication, and reliable locking of the expansion sleeve is achieved by controlling the torque within the range of 60-120N·m, and the material of the gasket is the same metal material as the valve body and the thickness is between 5-10mm.

[0018] Preferably, in the boring and milling processing steps, the tooling jig and the workpiece are positioned by means of positioning pins and positioning surfaces, and the positioning error in the three coordinate axis directions of X, Y and Z does not exceed 0.05mm; the special boring tool jig adopts a modular design, the boring tool modules can be quickly replaced and the positioning accuracy between each module is within ±0.005mm; in the boring and milling process, the cutting speed is selected in the range of 60-120m / min according to the valve body and valve material and the tool material, the feed rate is selected in the range of 0.08-0.2mm / r, and the cutting depth is determined in the range of 0.5-2mm according to the allowance.

[0019] Preferably, in the valve body support and related hole processing steps, the milling cutter is a carbide face milling cutter, and its blade helix angle is between 30°-45°. The milling parameters include a milling cutter speed in the range of 500-1000r / min, a feed speed in the range of 80-200mm / min, and a laser interferometer is used to monitor the parallelism of the bottom plane in real time, with the error controlled within ±0.02mm; when boring the anchor bolt holes, a double-edged boring cutter is used, and the straightness error of the cutting edge of the boring cutter is within ±0.002mm, the aperture tolerance of the bored hole is controlled within ±0.05mm, the position accuracy is within ±0.03mm, and the cylindricity error of the hole is within ±0.003mm.

[0020] Preferably, in the internal channel processing step, the boring tool is a boring tool with an adjustable tool head, and the radial adjustment accuracy of the tool head is within ±0.01mm. When boring the oil inlet hole, the sewage discharge hole and the exhaust hole, the cutting speed is in the range of 50-90m / min, the feed rate is in the range of 0.05-0.15mm / r, the diameter tolerance of each channel is controlled within ±0.03mm, the depth tolerance is controlled within ±0.05mm, the surface roughness Ra value is controlled between 1.6-3.2μm, and the relative position accuracy error between each channel is within ±0.05mm.

[0021] Preferably, in the vertical lathe processing step, the vertical lathe tool adopts a coated carbide tool. During turning, the cutting speed is in the range of 40-80m / min, the feed rate is in the range of 0.05-0.15mm / r, the processing size is monitored in real time by an online measurement system, the dimensional accuracy is controlled within ±0.02mm, and the surface finish Ra value is controlled between 0.8-1.6μm.

[0022] Preferably, in the drilling and subsequent processing steps, the drilling operation is performed using a CNC drilling machine, the feed speed during drilling is in the range of 20-60 mm / min, the top angle of the drill bit is between 118°-120°, the cleaning is performed using a combination of high-pressure gas blowing and organic solvent wiping, and deburring is performed using a special deburring tool or grinder. After deburring, the residual burr height on the surface of the component does not exceed 0.02 mm.

[0023] The present invention has the following beneficial effects:

[0024] 1. Compared with the prior art, the present invention effectively ensures the machining accuracy of key parts of the ball valve body and valve through multiple rounds of fine machining, strict position adjustment and precise dimensional accuracy control, such as repeated verification and correction of coaxiality and symmetry in boring and milling, and high-precision machining of dimensions of each surface in vertical lathe machining, etc., greatly reduces the risk of ball valve operation failure caused by machining errors, and improves the sealing performance and operational flexibility of the ball valve;

[0025] 2. Compared with the existing technology, the stress is eliminated from the pre-treatment stage of the components, such as annealing heat treatment after welding, and the components are reasonably fixed and supported by expansion sleeves, pads, etc. during the processing, which ensures the structural stability of the valve body and valve during the whole processing process, reduces the deformation of components caused by external forces, vibrations and other factors during the processing, thereby ensuring the long-term stable operation of the ball valve under the complex working conditions of the pumped storage power station, and effectively extending the service life of the ball valve;

[0026] 3. Compared with the existing technology, this process regards the processing of the valve body and the valve as an organic whole. The various processes are closely connected and coordinated with each other, forming a complete and efficient processing flow, avoiding the tedious process of separate processing of each component and then complex assembly and debugging in the traditional processing technology. It not only improves the processing efficiency and shortens the production cycle, but also better ensures the consistency of product quality, which is conducive to the large-scale production of pumped storage power station ball valves.

[0027] 4. Compared with the prior art, the processing technology involved in the present invention ensures the accuracy of each size through reasonable process arrangement and precise processing operation. More importantly, it reduces the number of times of lifting and turning over large workpieces, effectively improves work efficiency while reducing workload, makes the entire processing process more economical and efficient, further optimizes the processing and manufacturing links of the ball valve body of the pumped storage power station, reduces production costs and time costs, and improves production benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a pumped storage power station ball valve body and valve assembly processing technology proposed by the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0030] Figure 3 for Figure 1 Half-section of

[0031] Figure 4 It is a structural diagram of the expansion sleeve.

[0032] In the figure: 1 expansion sleeve, 2 lower valve body, 3 valve, 4 upper valve body, 5 fixing device, 6 upper valve shaft processing part, 7 support foot plane processing part, 8 lower valve shaft processing part. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Reference Figure 1 - Figure 4 , a pumped storage power station ball valve body valve assembly processing technology, comprising the following steps:

[0035] S1: Component pretreatment and assembly welding steps: perform rough machining on each surface of the lower valve body 2 and the upper valve body 4, and spray high-temperature paint on the inner wall; then install the valve 3 between the lower valve body 2 and the upper valve body 4, use multiple fixing devices 5 to pre-fix the valve 3, and then weld it according to the predetermined position, perform annealing heat treatment after welding, and then pass the flaw detection. After passing the flaw detection, enter the next step;

[0036] Rough machining is to use suitable cutting tools and cutting parameters to remove excess material and reserve allowance for fine machining. High-temperature coating has high temperature resistance, wear resistance, corrosion resistance and good adhesion to the valve body material. A specific spraying process is used to ensure that the coating thickness is uniform and meets the design requirements. Welding uses suitable welding materials based on the materials of the valve body and valve 3, and strictly controls welding process parameters. Annealing heat treatment eliminates welding stress by reasonably setting annealing temperature, holding time and cooling rate. Flaw detection uses at least one of ultrasonic flaw detection, radiographic flaw detection or magnetic particle flaw detection for comprehensive detection in accordance with relevant standards.

[0037] S2: Steps for adjusting and fixing the position of the valve 3 and the valve body: adjust the welded valve to the closed position, use the measuring instrument to accurately measure the relative position of the valve 3 sealing surface to the upstream and downstream sides of the valve body stop position and make them the same, then install the expansion sleeve 1 at the upper valve shaft processing part 6 and the lower valve shaft processing part 8, and use the expandable and contractible characteristics of the expansion sleeve 1 to carefully adjust the relative positions of the valve 3 and the valve body to make them accurately consistent with the various dimensions and positional relationships specified in the design drawings to ensure the symmetry and accuracy of the overall structure. After the position is adjusted in place, use the locking device to lock the expansion sleeve 1 at the upper and lower valve shafts to prevent position deviation during subsequent processing, and use the pads to weld and fix the upstream and downstream valve water outlets respectively. The material, size and welding process of the pads shall be carried out according to the design requirements to ensure that the welding is firm and does not affect the relevant accuracy of the water outlet and subsequent processing;

[0038] S3: Boring and milling processing steps: Use the jig to load the fixed workpiece onto the boring and milling machine workbench, adjust the workpiece position according to the set processing coordinate system and positioning reference, remove the expansion sleeve 1 at the lower valve shaft, install the special boring tool jig, use the jig to perform boring and milling processing on the valve shaft, the shaft hole in the valve body and the valve body plane in turn, and then change the tool to process the outer diameter of the valve shaft to ensure that the outer diameter dimensional accuracy of the valve shaft, the coaxiality of the valve shaft and the shaft hole in the valve body, and the symmetry of the valve 3 and the valve body meet the design requirements. After the first round of boring and milling processing is passed, reinstall the disassembled expansion sleeve 1 at the lower valve shaft, remove the expansion sleeve 1 at the upper valve shaft, operate the boring machine jig to rotate 180 degrees, and perform the above-mentioned boring and milling processing and hole drilling and valve shaft outer diameter processing operations again to ensure that the corresponding accuracy indicators meet the requirements;

[0039] S4: Valve body support and related hole processing steps: After the second round of boring and milling inspection is qualified, install the expansion sleeve 1 at the upper valve shaft, operate the boring machine table to rotate 90 degrees, use the milling cutter to mill the valve body support foot plane processing 7, adjust the milling parameters through real-time monitoring to ensure that the parallelism of the bottom plane meets the design requirements, and at the same time, bore the anchor bolt hole to ensure that the hole diameter tolerance, position accuracy and cylindricity of the bolt hole meet the requirements;

[0040] S5: Internal channel processing steps: Rotate the boring machine table to adjust the workpiece to a position suitable for boring the valve oil inlet hole, drain hole and exhaust hole, use a boring tool to bore these internal channels, strictly control the diameter tolerance, depth tolerance, surface roughness and relative position accuracy of each channel to meet the design requirements, ensure that the oil inlet can smoothly provide lubrication and power oil to the operating mechanism of the ball valve, the drain hole can timely and effectively discharge impurities and sewage that may accumulate inside the valve body, and the exhaust hole can discharge gas to ensure the normal operation of the ball valve;

[0041] S6: Vertical lathe processing steps: remove the upper side pad, remove the side pad after turning over, turn the valve 3 to the closed position, fix the valve shaft and clamp the workpiece to the vertical lathe, and process the various dimensions of the valve body and valve 3 according to the requirements of the design drawings; after turning over, perform the same processing on the dimensions of the valve body and valve 3 on the other side to ensure the consistency and overall symmetry of the processing dimensions of the two sides, so that the overall dimensional accuracy of the valve body and valve 3 meets the requirements of the design specifications;

[0042] S7: Drilling and subsequent processing steps: Drilling operations are performed on each surface of the valve body and the valve 3, and parameters such as the position accuracy, hole diameter tolerance, hole depth accuracy, and hole verticality of the drilling are strictly controlled. After the drilling is completed, comprehensive cleaning and deburring are performed to ensure that the surface of the components is smooth, and the combined processing technology of the valve body and valve 3 of the ball valve of the pumped storage power station is completed.

[0043] Among them, in the steps of component pretreatment and assembly welding, the dimensional margin of each surface of the valve body after rough machining is controlled within the range of 3-10mm, the spray thickness of the high-temperature coating is 0.2-0.6mm, and the welding process parameters include welding current controlled at 100-180A, voltage controlled at 20-28V, welding speed controlled at 5-15mm / min, annealing temperature set at 550℃-700℃, holding time at 1.5-3.5 hours, cooling rate at 10-30℃ / hour, and the sensitivity of flaw detection is not lower than the minimum sensitivity specified in the corresponding flaw detection standard.

[0044] Among them, in the steps of adjusting and fixing the position of the valve 3 and the valve body, the measuring instrument is a three-coordinate measuring instrument, and the relative position error from the sealing surface of the valve 3 to the upstream and downstream sides of the stop position of the valve body is controlled within ±0.1mm. The locking device is a locking nut with a scale indication, and the reliable locking of the expansion sleeve 1 is achieved by controlling the torque within the range of 60-120N·m. The material of the gasket is the same metal material as the valve body and the thickness is between 5-10mm.

[0045] Among them, in the boring and milling processing steps, the tooling jig and the workpiece are positioned through the cooperation of locating pins and locating surfaces, and the positioning error in the three coordinate axes of X, Y, and Z does not exceed 0.05mm; the special boring tool jig adopts a modular design, and the boring tool module can be quickly replaced and the positioning accuracy between each module is within ±0.005mm; in the boring and milling process, the cutting speed is selected in the range of 60-120m / min according to the material of the valve body and valve 3 and the material of the tool, the feed rate is selected in the range of 0.08-0.2mm / r, and the cutting depth is determined in the range of 0.5-2mm according to the allowance.

[0046] Among them, in the valve body support and related hole processing steps, the milling cutter is a carbide face milling cutter with a blade helix angle between 30°-45°, the milling parameters include a milling cutter speed within the range of 500-1000r / min, a feed speed within the range of 80-200mm / min, and a laser interferometer is used to monitor the parallelism of the bottom plane in real time, with the error controlled within ±0.02mm; when boring the anchor bolt holes, a double-edged boring cutter is used, with the straightness error of the cutting edge of the boring cutter within ±0.002mm, the aperture tolerance of the bored hole controlled within ±0.05mm, the position accuracy within ±0.03mm, and the cylindricity error of the hole within ±0.003mm.

[0047] Among them, in the internal hole processing step, the boring tool is a boring tool with an adjustable tool head, and the radial adjustment accuracy of the tool head is within ±0.01mm. When boring the oil inlet hole, sewage hole and exhaust hole, the cutting speed is in the range of 50-90m / min, the feed rate is in the range of 0.05-0.15mm / r, the diameter tolerance of each hole is controlled within ±0.03mm, the depth tolerance is controlled within ±0.05mm, the surface roughness Ra value is controlled between 1.6-3.2μm, and the relative position accuracy error between each hole is within ±0.05mm.

[0048] Among them, in the vertical lathe processing step, the vertical lathe tool uses a coated carbide tool. During turning, the cutting speed is in the range of 40-80m / min, the feed rate is in the range of 0.05-0.15mm / r, and the processing size is monitored in real time through the online measurement system. The dimensional accuracy is controlled within ±0.02mm, and the surface finish Ra value is controlled between 0.8-1.6μm.

[0049] Among them, in the drilling and subsequent processing steps, the drilling operation is carried out using a CNC drilling machine, the feed speed during drilling is in the range of 20-60mm / min, the top angle of the drill bit is between 118°-120°, and cleaning is carried out by combining high-pressure gas blowing and organic solvent wiping. Deburring is carried out using a special deburring tool or grinder. After deburring, the residual burr height on the surface of the component does not exceed 0.02mm.

[0050] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A combined processing technology for ball valve body and valve of a pumped storage power station, characterized in that: The following steps are involved: S1: Component pretreatment and assembly welding steps: perform rough processing on each surface of the lower valve body (2) and the upper valve body (4), and spray high-temperature paint on the inner wall; then install the valve (3) between the lower valve body (2) and the upper valve body (4), use multiple fixing devices (5) to pre-fix the valve (3), and then weld it according to the predetermined position. After welding, perform annealing heat treatment, and then pass the flaw detection test. After passing the flaw detection test, enter the next step; S2: Steps for adjusting and fixing the position of the valve (3) and the valve body: adjust the welded valve to the closed position, accurately measure the relative position of the valve (3) sealing surface to the upstream and downstream sides of the stop position of the valve body with the help of a measuring instrument and make them the same, then install the expansion sleeve (1) at the upper valve shaft processing position (6) and the lower valve shaft processing position (8), after the position is adjusted to the right position, use the locking device to lock the expansion sleeve (1) at the upper and lower valve shafts, and weld and fix the upstream and downstream valve water outlets with pads respectively; S3: Boring and milling processing steps: Use a jig to load the fixed workpiece onto the boring and milling machine table, adjust the workpiece position according to the set processing coordinate system and positioning reference, remove the expansion sleeve (1) at the lower valve shaft, install a special boring tool jig, use the jig to perform boring and milling processing on the valve shaft, the shaft hole in the valve body and the valve body plane in turn, then change the tool to process the outer diameter of the valve shaft. After the first round of boring and milling processing is qualified, reinstall the disassembled expansion sleeve (1) at the lower valve shaft, remove the expansion sleeve (1) at the upper valve shaft, operate the boring machine jig to rotate 180 degrees, and perform the above-mentioned boring and milling processing and hole drilling and valve shaft outer diameter processing operations again; S4: Valve body support and related hole processing steps: After the second round of boring and milling inspection is qualified, install the expansion sleeve (1) at the upper valve shaft, operate the boring machine table to rotate 90 degrees, use the milling cutter to mill the valve body support foot plane processing part (7), and bore the anchor bolt hole at the same time; S5: Internal channel processing steps: rotating the boring machine table, adjusting the workpiece to a position suitable for boring the valve oil inlet hole, drain hole and exhaust hole, and using a boring tool to bore these internal channels; S6: Vertical lathe processing steps: remove the upper side pad, turn over and remove the side pad, turn the valve (3) to the closed position, fix the valve shaft and then clamp the workpiece to the vertical lathe; S7: Drilling and subsequent processing steps: Drill holes on each side of the valve body and the valve (3), and perform comprehensive cleaning and deburring after drilling.

2. A combined processing technology for ball valve body and valve of a pumped storage power station according to claim 1, characterized in that: In the component pretreatment and assembly welding steps, the dimensional margin of each surface of the valve body after rough processing is controlled within the range of 3-10mm, the spray thickness of the high-temperature coating is 0.2-0.6mm, the welding current in the welding process parameters is controlled within the range of 100-180A, the voltage is controlled within the range of 20-28V, the welding speed is controlled within the range of 5-15mm / min, the annealing temperature is set within the range of 550℃-700℃, the holding time is 1.5-3.5 hours, the cooling rate is 10-30℃ / hour, and the sensitivity of the flaw detection is not lower than the minimum sensitivity specified in the corresponding flaw detection standard.

3. A combined processing technology for ball valve body and valve of a pumped storage power station according to claim 1, characterized in that: In the step of adjusting and fixing the position of the valve (3) and the valve body, the measuring instrument is a three-coordinate measuring instrument, and the relative position error between the sealing surface of the valve (3) and the upstream and downstream sides of the stop position of the valve body is controlled within ±0.1 mm. The locking device is a locking nut with a scale indicator, and the reliable locking of the expansion sleeve (1) is achieved by controlling the torque within the range of 60-120 N·m. The material of the gasket is the same metal material as the valve body and the thickness is between 5-10 mm.

4. A combined processing technology for ball valve body and valve of a pumped storage power station according to claim 1, characterized in that: In the boring and milling processing steps, the tooling jig and the workpiece are positioned by means of positioning pins and positioning surfaces, and the positioning error in the three coordinate axis directions of X, Y and Z does not exceed 0.05 mm; the special boring tool jig adopts a modular design, and the boring tool modules can be quickly replaced and the positioning accuracy between each module is within ±0.005 mm; in the boring and milling processing process, the cutting speed is selected in the range of 60-120 m / min according to the material of the valve body and the valve (3) and the material of the tool, the feed rate is selected in the range of 0.08-0.2 mm / r, and the cutting depth is determined in the range of 0.5-2 mm according to the allowance.

5. The combined processing technology of the ball valve body and valve of a pumped storage power station according to claim 1 is characterized by: In the valve body support and related hole processing steps, the milling cutter is a carbide face milling cutter, and its blade helix angle is between 30°-45°. The milling parameters include a milling cutter speed in the range of 500-1000r / min, a feed speed in the range of 80-200mm / min, and a laser interferometer is used to monitor the parallelism of the bottom plane in real time, with the error controlled within ±0.02mm; when boring the anchor bolt holes, a double-edged boring cutter is used, and the straightness error of the cutting edge of the boring cutter is within ±0.002mm, the aperture tolerance of the bored hole is controlled within ±0.05mm, the position accuracy is within ±0.03mm, and the cylindricity error of the hole is within ±0.003mm.

6. A combined processing technology for ball valve body and valve of a pumped storage power station according to claim 1, characterized in that: In the internal channel processing step, the boring tool is a boring tool with an adjustable tool head, and the radial adjustment accuracy of the tool head is within ±0.01mm. When boring the oil inlet hole, the sewage hole and the exhaust hole, the cutting speed is in the range of 50-90m / min, the feed rate is in the range of 0.05-0.15mm / r, the diameter tolerance of each channel is controlled within ±0.03mm, the depth tolerance is controlled within ±0.05mm, the surface roughness Ra value is controlled between 1.6-3.2μm, and the relative position accuracy error between each channel is within ±0.05mm.

7. A combined processing technology for ball valve body and valve of a pumped storage power station according to claim 1, characterized in that: In the vertical lathe processing step, the vertical lathe tool adopts a coated carbide tool. During turning, the cutting speed is in the range of 40-80m / min, the feed rate is in the range of 0.05-0.15mm / r, the processing size is monitored in real time by an online measurement system, the dimensional accuracy is controlled within ±0.02mm, and the surface finish Ra value is controlled between 0.8-1.6μm.

8. The process for combined processing of ball valve body and valve of pumped storage power station according to claim 1, characterized in that: In the drilling and subsequent processing steps, the drilling operation is performed using a CNC drilling machine, the feed speed during drilling is in the range of 20-60 mm / min, the top angle of the drill bit is between 118°-120°, the cleaning is performed using a combination of high-pressure gas blowing and organic solvent wiping, and deburring is performed using a special deburring tool or grinder. After deburring, the residual burr height on the surface of the component does not exceed 0.02 mm.

Images