Modular method for machining a large welded valve

Abstract

The application discloses a modular processing method of a large welding valve. The processing of the large welding ball valve is divided into four processing modules, i.e. double-side valve shaft and valve body shaft hole processing, valve body upstream and downstream sliding surface processing, double-side valve sealing surface processing, foundation plane and various hole processing, and through free combination among the modules, multiple processing routes can be formed. The application has the characteristics of easy popularization, high efficiency, flexible production arrangement, low labor intensity, high precision and reliable quality.

Description

Technical Field

[0001] This invention relates to the field of machining, and in particular to a modular machining method for large welded valves. Background Technology

[0002] Large welded integral ball valves have been widely used in hydropower projects in recent years due to their good structural stability, high safety factor, and convenient maintenance. The conventional manufacturing method involves first using a CNC floor-type boring machine with a rotary table to machine the valve shafts and their holes at both ends, and then using a separate CNC vertical lathe to machine the valve body and its upper and lower sides simultaneously. This method is technically mature and reliable, but if a large number of valves need to be produced simultaneously, it can easily lead to congestion at the beginning of the process, resulting in a long overall manufacturing cycle and low production efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a modular processing method for large welded valves that is easy to promote, has a short cycle time, high efficiency, low labor intensity, high precision, and flexible production scheduling. The method is implemented through the following steps:

[0004] S1. The valve body and valve are roughly machined and then assembled together. The two halves of the valve body are welded together as a whole.

[0005] S2. Use the tool arm to rotate the valve to the fully open and fully closed positions respectively. Ensure that the valve rotates flexibly without any stiffness or interference. Then, adjust the valve to the fully open position.

[0006] S3. With the valve fully open, lower the ball valve to the downstream side of the valve body and place it on the level pad. Secure the valve using the pressure plate at the inner flow channel of the valve, align it, tighten the valve body, and recheck the alignment result.

[0007] S4. Roughing, semi-finishing, and finishing of all circular and flat surfaces on the upstream side of the valve body;

[0008] S5. The crane lifts the ball valve off the machine tool and rotates it 180° so that the upstream side of the valve body is facing down; the valve is fully open, and the ball valve is lifted to the downstream side of the valve body and placed on the leveling pad. After aligning the valve body with the upstream side plane and inner and outer circles machined by the vertical lathe, the valve body is tightened, and the alignment result is checked again;

[0009] S6. Roughing, semi-finishing, and finishing of all circular and flat surfaces on the downstream side of the valve body;

[0010] S7. The crane lifts the ball valve off the machine tool, flips the ball valve so that the bottom plane of the valve body is facing down, and places it on the working platform of the CNC boring machine, with the upstream side of the valve body facing the boring machine spindle. The valve is fully opened, aligned according to the machined part, the valve body is tightened, and the alignment result is checked again;

[0011] S8. CNC programming and machining of all threaded holes and radial holes on the upstream side of the valve body;

[0012] S9. Rotate the ball valve horizontally 180° so that the downstream side of the valve body faces the CNC boring machine spindle. Fully open the valve, align it according to the machined part, tighten the valve body, and recheck the alignment result;

[0013] S10. CNC programming and machining of all threaded holes and radial holes on the downstream side of the valve body;

[0014] S11. Flip the ball valve so that the bottom plane of the valve body faces the spindle of the CNC boring machine, align it according to the machined part, tighten the valve body, and recheck the alignment result;

[0015] S12. Machining the valve body bottom plane and the engagement hole;

[0016] S13. Place the valve body with the downstream side facing down on the rotary table of the boring machine. Level the valve body according to the plane of the upstream side. Make sure the readings at the points are the same. Adjust the valve body to be concentric with the rotary table according to the inner and outer circles of the upstream side of the valve body. After the adjustment is qualified, press the valve body firmly.

[0017] S14. With the valve fully open, adjust the inner circle of the valve's flow surface to be concentric with the inner circle of the upstream side of the valve body. After successful adjustment, tighten the valve and recheck the alignment results.

[0018] S15. Remove the simple tool arms on both sides;

[0019] S16. Using a CNC rotary table, CNC programming is used to machine the valve shaft and shaft hole on one side of the ball valve.

[0020] S17. The CNC rotary table rotates 180° to CNC machine the valve shaft and shaft hole on the other side.

[0021] S18. Install the valve shafts, shaft holes, bearings, and other components on both sides, and install the waist-shaped tool arms and end caps on both sides;

[0022] S19. With the valve fully closed, place the ball valve on the downstream side of the valve body onto the CNC vertical lathe with the upstream side of the valve body facing upwards. Align the valve body according to the inner and outer circle alignment sections and the plane on the upstream side of the valve body, tighten the valve body, and recheck the alignment results.

[0023] S20, CNC machined valve upstream side sealing seat mating surface and circle;

[0024] S21. The crane, in conjunction with the double-sided waist-shaped tool boom, rotates the valve 180° and CNC machines the downstream sealing seat mating surface and circle.

[0025] In the modular processing method of the above-mentioned large welded valve, S1 also includes the following: the valve body and the valve are roughly machined and then assembled together. Before the two halves of the valve body are welded into a whole, the non-machined casting surface should be inspected and the interference parts should be ground.

[0026] In the modular processing method of the above-mentioned large welded valve, S2 and S3 also include the following: four welding blocks are evenly distributed circumferentially on the unmachined outer circle of the valve body on the upstream and downstream sides and on the inner circle of the valve, respectively, for use in clamping and fixing the valve body and valve on the boring machine and vertical lathe; the valve is fully opened, the ball valve is hoisted to the downstream side of the valve body and placed on the equal height pad, the 0.05mm feeler gauge between the mating plane and the pad plane does not pass through, the valve is fixed by the pressure plate at the flow channel of the valve inner circle, the valve body is clamped after alignment, and the alignment result is re-inspected.

[0027] In the modular machining method for the aforementioned large welded valve, step S5 further includes the following: A crane lifts the ball valve off the machine tool and rotates it 180° so that the upstream side of the valve body faces downwards. The valve is fully opened, and the ball valve is lifted to the downstream side of the valve body and placed on a level pad. A feeler gauge should not pass through the 0.05mm gap between the mating plane and the pad plane. The valve is fixed by a pressure plate at the inner flow channel of the valve. The upstream side plane and inner and outer circles of the valve body machined by the vertical lathe are aligned to ensure that the coaxiality of the inner circles of the valve body on the upstream and downstream sides is less than 0.05mm. The valve body is then tightened, and the alignment result is rechecked.

[0028] In the modular machining method for the aforementioned large welded valve, step S7 further includes the following: a crane lifts the ball valve off the machine tool, flips the ball valve so that the bottom plane of the valve body faces downwards, and places it on the CNC boring machine's work platform, with the upstream side of the valve body facing the boring machine spindle. The valve is fully opened, and the valve position is adjusted in a timely manner to avoid affecting the boring sequence of the valve body. The valve is aligned according to the already machined parts, the valve body is tightened, and the alignment result is re-inspected.

[0029] In the modular machining method for the aforementioned large welded valve, step S9 further includes the following: the ball valve is rotated horizontally by 180°, with the downstream side of the valve body facing the spindle of the CNC boring machine. The valve is fully opened, and the valve position is adjusted in a timely manner to avoid affecting the boring sequence of the valve body. The valve body is aligned according to the machined parts, tightened, and the alignment result is re-inspected.

[0030] In the modular processing method of the large welded valve described above, S11 also includes the following: flipping the ball valve so that the bottom plane of the valve body faces the spindle of the CNC boring machine, aligning it according to the machined parts, and coordinating with multi-point measurement to ensure that the center dimension and machining allowance of each part are uniform, pressing the valve body, and re-checking the alignment results.

[0031] In the modular processing method of the above-mentioned large welded valve, S13 also includes the following: the valve body is placed on the rotary table of the boring machine with the downstream side facing down, the valve body is leveled according to the upstream side plane, the point readings are the same, the valve body is adjusted to be concentric with the rotary table according to the inner and outer circles of the upstream side of the valve body, and the valve body is pressed firmly after the adjustment is qualified.

[0032] In the modular processing method for the large welded valve described above, step S14 further includes the following: The valve is fully open; the inner circle of the valve's flow surface is adjusted to be concentric with the inner circle of the upstream side of the valve body. The valve shafts at both ends of the valve are finely adjusted to be concentric with the valve body shaft holes to ensure uniform machining allowance. After the adjustment is qualified, the valve is firmly pressed down, and the alignment result is re-inspected.

[0033] In the modular processing method of the above-mentioned large welded valve, S21 also includes the following: a crane, in conjunction with double-sided waist-shaped tool arms, rotates the valve by 180°, and two positioning pins are used on each side to fix the waist-shaped tool arms and the valve body. The two pins are distributed at 90°, and the sealing seat mating surface and circle on the downstream side of the valve are CNC machined.

[0034] Due to the adoption of the above solution, the beneficial effects of the present invention are:

[0035] 1. This invention divides the machining of large welded valves into four machining modules: machining of the double-sided valve shaft and valve body shaft holes, machining of the upstream and downstream sliding surfaces of the valve body, machining of the double-sided valve sealing surfaces, and machining of the mounting plane and various holes. The first process route includes machining of the upstream and downstream sliding surfaces of the valve body, machining of the double-sided valve shaft and valve body shaft holes, machining of the mounting plane and various holes, and machining of the double-sided valve sealing surfaces. The second process route includes machining of the upstream and downstream sliding surfaces of the valve body, machining of the double-sided valve shaft and valve body shaft holes, machining of the double-sided valve sealing surfaces, and machining of the mounting plane and various holes. The third process route includes machining of the double-sided valve shaft and valve body shaft holes, machining of the upstream and downstream sliding surfaces of the valve body, machining of the double-sided valve sealing surfaces, and machining of the mounting plane and various holes. The fourth process route includes machining of the double-sided valve shaft and valve body shaft holes, machining of the mounting plane and various holes, machining of the upstream and downstream sliding surfaces of the valve body, and machining of the double-sided valve sealing surfaces. By implementing different process routes, production flexibility will be greatly improved, production efficiency will be significantly enhanced, and the overall cycle of manufacturing multiple ball valves simultaneously can be effectively shortened.

[0036] 2. By developing new tooling and rationally setting process routes, this invention can minimize fixing methods such as lap welding and spot welding, thereby improving the physical quality and appearance quality of the product.

[0037] 3. This invention is applicable to the processing of large welded integral ball valves. It is convenient to apply, easy to promote, highly versatile, efficient, and of stable quality, meeting the needs of various production scenarios. Attached Figure Description

[0038] Figure 1 Machining diagram for the fully closed position of a large welded valve.

[0039] Figure 2 This is a schematic diagram of the base plan.

[0040] Figure 3 This is a diagram of the waist-shaped tool's rotating arm and end cap.

[0041] Figure 4 Diagram of the waist-shaped tool rotating arm

[0042] The following are the labels in the diagram: 1-Valve body; 2-Valve; 3-Valve shaft I; 4-Shaft hole I; 5-Valve shaft II; 6-Shaft hole II; 7-Upstream side of valve body; 8-Downstream side of valve body; 9-Valve body base; 10-Upstream side of valve; 11-Downstream side of valve; 12-Oval tool arm; 13-End cap. Detailed Implementation

[0043] The present application will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and should not be construed as limiting the scope of protection of the present application.

[0044] Specific implementation method one: as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment provides a modular processing method for large welded valves, which is implemented through the following steps:

[0045] S1, valve body 1, and valve 2 are roughly machined and then assembled together. The two halves of valve body 1 are welded together as a whole.

[0046] S2. Use the tool arm to rotate valve 2 to the fully open and fully closed positions respectively. Ensure that valve 2 rotates flexibly without any stiffness or interference. Then, adjust valve 2 to the fully open position.

[0047] S3, with valve 2 fully open, lower the ball valve to the downstream side 8 of the valve body and place it on the level pad. Secure the valve using the pressure plate at the inner flow channel of valve 2, align it, tighten the valve body, and recheck the alignment result;

[0048] S4. Roughing, semi-finishing, and finishing of the seven circular and flat surfaces on the upstream side of the valve body;

[0049] S5. The crane lifts the ball valve off the machine tool and rotates it 180° so that the upstream side 7 of the valve body faces downwards. The valve 2 is fully opened, and the ball valve is lifted to the downstream side 8 of the valve body and placed on the leveling pad. After aligning the valve body with the plane and inner and outer circles of the upstream side 7 of the valve body machined by the vertical lathe, the valve body 1 is tightened, and the alignment result is checked again.

[0050] S6. Roughing, semi-finishing, and finishing of the eight circular and flat surfaces on the downstream side of the valve body;

[0051] S7. The crane lifts the ball valve off the machine tool, flips the ball valve so that the bottom plane 9 of the valve body is facing down, and places it on the working platform of the CNC boring machine, with the upstream side 7 of the valve body facing the spindle of the boring machine. The valve 2 is fully opened, aligned according to the machined part, the valve body 1 is tightened, and the alignment result is checked again;

[0052] S8. CNC programming and machining of 7 threaded holes and radial holes on the upstream side of the valve body;

[0053] S9. Rotate the ball valve horizontally 180°, with the downstream side 8 of the valve body facing the spindle of the CNC boring machine; fully open the valve 2, align it according to the machined part, tighten the valve body 1, and recheck the alignment result;

[0054] S10, CNC programming to machine 8 threaded holes and radial holes on the downstream side of the valve body;

[0055] S11. Flip the ball valve so that the bottom 9 plane of the valve body faces the spindle of the CNC boring machine, align it according to the machined part, tighten the valve body 1, and recheck the alignment result;

[0056] S12. Machining the valve body base plane 9 and the engagement hole;

[0057] S13. Place the valve body with the downstream side 8 facing down on the rotary table of the boring machine. Level it according to the plane of the upstream side 7 of the valve body. Make sure the readings at the points are the same. Adjust the valve body to be concentric with the rotary table according to the inner and outer circles of the upstream side 7 of the valve body. After the adjustment is qualified, press the valve body 1 firmly.

[0058] S14. With valve 2 fully open, adjust the inner circle of the flow surface of valve 2 to be concentric with the inner circle of the upstream side 7 of the valve body. After the adjustment is qualified, tighten valve 2 and recheck the alignment result;

[0059] S15. Remove the simple tool arms on both sides;

[0060] S16. Using a CNC rotary table, CNC programmable machining is performed on one side of the ball valve shaft 3 and shaft hole 4.

[0061] S17. The CNC rotary table rotates 180° to CNC machine the valve shaft 5 and shaft hole 6 on the other side.

[0062] S18. Install the valve shafts, shaft holes and bearings on both sides, and install the waist-shaped tool arms 12 and end caps 13 on both sides.

[0063] S19. With the valve fully closed, the ball valve is lowered to the downstream side plane of the valve body and placed on the CNC vertical lathe with the upstream side 7 facing upwards. The valve body is aligned according to the inner and outer circles of the upstream side 7 and the plane. The valve body is then tightened, and the alignment results are checked again.

[0064] S20, CNC machined valve upstream side 10 sealing seat mating surface and circle;

[0065] S21. The crane, in conjunction with the double-sided waist-shaped tool boom 12, rotates the valve 2 by 180° and CNC machines the sealing seat mating surface and circle of the downstream side 11 of the valve.

[0066] This embodiment provides a modular processing method for large welded valves. The technical route includes processing the upstream and downstream sliding surfaces of the valve body, processing the foot plane and various holes, processing the valve shaft and valve body shaft holes of the double-sided valve, and processing the sealing surface of the double-sided valve. It has strong versatility.

[0067] Specific implementation method two: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S2 as described in Specific Embodiment 1. In this embodiment, the valve body 1 and the valve 2 are assembled together after rough machining. Before the two halves of the valve body 1 are welded into a whole, the non-machined casting surface should be inspected and the interference parts should be ground.

[0068] In this embodiment, the non-machined casting surface is inspected before the valve body is welded into a whole, which can effectively avoid the risk of collision during assembly and pressure testing after the ball valve is precision machined.

[0069] Specific implementation method three: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S2 and S3 as described in Specific Embodiment 1. In this embodiment, four welding blocks are evenly distributed circumferentially on the unmachined outer circles of the upstream and downstream sides of the valve body 1 and the inner circle of the valve 2, respectively, for use in clamping and fixing the valve body 1 and the valve 2 on the boring machine and vertical lathe. When the valve 2 is fully open, the ball valve is suspended to the downstream side 8 of the valve body and placed on the equal height pad. A 0.05mm feeler gauge does not pass through the mating plane and the pad plane. The valve is fixed by the pressure plate at the inner circle flow channel of the valve 2. After alignment, the valve body is clamped and the alignment result is checked again.

[0070] In this embodiment, the workpiece is clamped by welding pressure blocks and pads, and the gap requirements and re-inspection requirements are specified, making it highly versatile.

[0071] Specific implementation method four: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S5 as described in Specific Embodiment 1. In this embodiment, the crane lifts the ball valve off the machine tool, rotates it 180° so that the upstream side 7 of the valve body faces downward, the valve 2 is fully open, and the ball valve is lifted to the downstream side 8 of the valve body and placed on the equal-height pad. A feeler gauge of 0.05mm does not pass between the mating plane and the pad plane. The valve 2 is fixed by the pressure plate at the inner circle flow channel of the valve. The upstream side 7 plane and inner and outer circles of the valve body are aligned according to the vertical lathe to ensure that the coaxiality of the inner circles of the valve body on the upstream and downstream sides is less than 0.05mm. The valve body 1 is pressed tight, and the alignment result is checked again.

[0072] This embodiment specifies the clamping method and coaxiality detection requirements, which can more efficiently align the workpiece and ensure processing quality.

[0073] Specific implementation method five: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S7 as described in Specific Embodiment 1. In this embodiment, a crane lifts the ball valve off the machine tool, flips the ball valve so that the bottom plane 9 of the valve body faces downwards, and places it on the working platform of the CNC boring machine, with the upstream side 7 of the valve body facing the boring machine spindle. The valve 2 is fully open, and the position of the valve 2 is adjusted in a timely manner so as not to affect the boring sequence of the valve body 1. The valve body 1 is aligned according to the already machined parts, pressed tight, and the alignment result is checked again.

[0074] In this embodiment, the upstream side of the valve body faces the boring machine spindle, and the valve is in a fully open position. To ensure the smooth progress of the boring process, the valve position is adjusted in a timely manner during the machining process to avoid interference with the boring bar.

[0075] Specific implementation method six: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S9 as described in Specific Embodiment 1. In this embodiment, the ball valve rotates horizontally by 180°, the downstream side 8 of the valve body faces the spindle of the CNC boring machine, the valve 2 is fully open, and the position of the valve 2 is adjusted in time so as not to affect the boring sequence of the valve body 1. The valve body 1 is aligned according to the machined part, the valve body 1 is pressed, and the alignment result is rechecked.

[0076] In this embodiment, the downstream side of the valve body faces the boring machine spindle, and the valve is in a fully open position. To ensure the smooth progress of the boring process, the valve position is adjusted in a timely manner during the machining process to avoid interference with the boring bar.

[0077] Specific implementation method seven: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S11 as described in Specific Embodiment 1. In this embodiment, the ball valve is flipped so that the plane of the bottom foot 9 of the valve body faces the spindle of the CNC boring machine, aligned with the machined parts, and multi-point measurement is used to ensure that the center dimension and machining allowance of each part are uniform. The valve body 1 is then pressed and the alignment result is checked again.

[0078] In this embodiment, the bottom plane of the valve body faces the machining station of the CNC boring machine spindle, and the alignment measurement requirements are clearly defined to ensure the accuracy of the machining.

[0079] Specific implementation method eight: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S13 as described in Specific Embodiment 1. In this embodiment, the downstream side 8 of the valve body is placed downward on the rotary table of the boring machine. The valve body is leveled according to the plane of the upstream side 7 of the valve body. The readings at the points are the same. The valve body is adjusted to be concentric with the rotary table according to the inner and outer circles of the upstream side 7 of the valve body. After the adjustment is qualified, the valve body 1 is pressed firmly.

[0080] In this embodiment, the downstream side of the valve body is facing downwards at the workstation, and the CNC rotary table is used for alignment and machining, which can greatly improve machining efficiency and machining quality.

[0081] Specific implementation method nine: as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S14 as described in Specific Embodiment 1. In this embodiment, valve 2 is fully open, and the inner circle of the flow surface of valve 2 is adjusted to be concentric with the inner circle of the upstream side 7 of the valve body. The valve shafts at both ends of valve 2 are finely adjusted to be concentric with the shaft holes of the valve body to ensure uniform machining allowance. After the adjustment is qualified, valve 2 is pressed firmly, and the alignment result is rechecked.

[0082] This embodiment specifies the adjustment requirements for the valve shaft and shaft hole at both ends of the valve to ensure stable and reliable quality of the ball valve shaft and shaft hole machining.

[0083] Specific implementation method ten: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment further defines S21 as described in Specific Embodiment 1. In this embodiment, the crane, in conjunction with the double-sided waist-shaped tool arm 12, rotates the valve 2 by 180°. Two positioning pins are used on each side to fix the waist-shaped tool arm 12 and the valve body 1. The two pins are distributed at 90°. The sealing seat of the downstream side 11 of the valve is CNC machined to fit the mating surface and the circle.

[0084] In this embodiment, a crane and a waist-shaped tool boom are used in conjunction, and the two sealing seats of the valve can be processed in one clamping operation, which is convenient and efficient.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular processing method for a large welded valve, characterized in that: The method is implemented through the following steps: S1, valve body (1), and valve (2) are roughly machined and then assembled together. The two halves of valve body (1) are welded together as a whole. S2. Use the tool arm to rotate the valve (2) to the fully open and fully closed positions respectively. After ensuring that the valve (2) rotates flexibly without any stiffness or interference, adjust the valve (2) to the fully open position. S3. Fully open the valve (2), lower the ball valve to the downstream side (8) of the valve body and place it on the equal height pad. Fix the valve through the pressure plate at the inner circle flow channel of the valve (2), tighten the valve body after alignment, and recheck the alignment result. S4. Roughing, semi-finishing, and finishing of valve body upstream side (7) each circular and flat surface; S5. The crane lifts the ball valve off the machine tool and rotates it 180° so that the upstream side (7) of the valve body faces down; the valve (2) is fully opened, and the ball valve is lifted to the downstream side (8) of the valve body and placed on the equal height pad. After aligning the upstream side (7) plane and inner and outer circles of the valve body processed by the vertical machine, the valve body (1) is pressed and the alignment result is checked again. S6. Roughing, semi-finishing, and finishing of valve body downstream side (8) each circular and flat surface; S7. The crane lifts the ball valve off the machine tool, flips the ball valve so that the bottom (9) plane of the valve body is facing down and places it on the CNC boring machine work platform, with the upstream side (7) of the valve body facing the boring machine spindle; the valve (2) is fully opened, aligned according to the machined part, the valve body (1) is pressed tight, and the alignment result is checked again; S8. CNC programming is used to machine the threaded holes and radial holes on the upstream side (7) of the valve body; S9. Rotate the ball valve horizontally 180°, with the downstream side (8) of the valve body facing the spindle of the CNC boring machine; fully open the valve (2), align it according to the machined part, press the valve body (1), and recheck the alignment result; S10, CNC programming to machine the threaded holes and radial holes on the downstream side (8) of the valve body; S11. Flip the ball valve so that the bottom foot (9) of the valve body faces the spindle of the CNC boring machine, align it according to the machined part, tighten the valve body (1), and recheck the alignment result; S12. Machining the bottom plane (9) of the valve body and the mating hole; S13. Place the valve body with the downstream side (8) facing down on the rotary table of the boring machine. Level the valve body according to the plane of the upstream side (7). Make sure the readings at the points are the same. Adjust the valve body to be concentric with the rotary table according to the inner and outer circles of the upstream side (7). After the adjustment is qualified, press the valve body (1) firmly. S14. Fully open the valve (2), adjust the inner circle of the flow surface of the valve (2) to be concentric with the inner circle of the upstream side (7) of the valve body; after the adjustment is qualified, press the valve (2) firmly and recheck the alignment result; S15. Remove the simple tool arms on both sides; S16. Using a CNC rotary table, CNC program and machine one side of the ball valve valve shaft I (3) and shaft hole I (4); S17. Rotate the CNC rotary table 180° and CNC machine the valve shaft II (5) and shaft hole II (6) on the other side. S18. Install the valve shafts and shaft holes on both sides, and install the waist-shaped tool arms (12) and end caps (13) on both sides. S19. With the valve fully closed, the ball valve is placed on the CNC vertical lathe with the downstream side plane of the valve body facing up. The upstream side (7) of the valve body is facing up. The valve body is aligned according to the inner and outer circles of the upstream side (7) of the valve body and the plane. The valve body is then tightened and the alignment results are checked again. S20, CNC machining valve upstream side (10) sealing seat mating surface and circle; S21. The crane, in conjunction with the double-sided waist-shaped tool boom (12), rotates the valve (2) 180° and CNC processes the sealing seat of the downstream side (11) of the valve to form the mating surface and circle.

2. The modular processing method for a large welded valve according to claim 1, characterized in that: In S1, the valve body (1) and the valve (2) are assembled together after rough machining. Before the two halves of the valve body (1) are welded into a whole, the unmachined casting surface is inspected and the interference parts are ground.

3. The modular processing method for a large welded valve according to claim 1, characterized in that: In S2 and S3, four welding blocks are evenly distributed circumferentially on the unmachined outer circle of the valve body (1) and the inner circle of the valve (2) to be used for pressing and fixing the valve body (1) and the valve (2) on the boring machine and vertical lathe. When the valve (2) is fully open, the ball valve is lifted to the downstream side (8) of the valve body and placed on the equal height pad. The 0.05mm feeler gauge between the mating plane and the pad plane does not pass through. The valve is fixed by the pressure plate at the inner circle flow channel of the valve (2). After alignment, the valve body is pressed and the alignment result is checked again.

4. The modular processing method for a large welded valve according to claim 1, characterized in that: In S5, the crane lifts the ball valve off the machine tool, rotates it 180° so that the upstream side (7) of the valve body faces down, the valve (2) is fully open, the ball valve is lifted to the downstream side (8) of the valve body and placed on the equal height pad. The 0.05mm feeler gauge between the mating plane and the pad plane does not pass through. The valve (2) is fixed by the pressure plate at the inner circle flow channel of the valve. The upstream side (7) plane and inner and outer circles of the valve body are aligned according to the vertical lathe to ensure that the coaxiality of the inner circles of the valve body on the upstream and downstream sides is less than 0.05mm. The valve body (1) is pressed tight and the alignment result is checked again.

5. The modular processing method for a large welded valve according to claim 1, characterized in that: In S7, the crane lifts the ball valve off the machine tool, flips the ball valve so that the bottom (9) plane of the valve body is facing down and places it on the CNC boring machine platform, with the upstream side (7) of the valve body facing the boring machine spindle, the valve (2) fully open, and adjusts the position of the valve (2) in a timely manner so as not to affect the boring sequence of the valve body (1), aligns it according to the already machined parts, presses the valve body (1), and re-checks the alignment result.

6. The modular processing method for a large welded valve according to claim 1, characterized in that: In S9, the ball valve rotates horizontally by 180°, the downstream side (8) of the valve body faces the spindle of the CNC boring machine, the valve (2) is fully open, and the position of the valve (2) is adjusted in time so as not to affect the boring sequence of the valve body (1), the alignment is set according to the machined part, the valve body (1) is pressed, and the alignment result is checked again.

7. The modular processing method for a large welded valve according to claim 1, characterized in that: In step S11, the ball valve is flipped so that the bottom foot (9) plane of the valve body faces the spindle of the CNC boring machine, aligned with the machined parts, and with the cooperation of multi-point measurement, the center dimension and machining allowance of each part are uniform, the valve body (1) is pressed tight, and the alignment result is checked again.

8. The modular processing method for a large welded valve according to claim 1, characterized in that: In S13, the valve body is placed on the rotary table of the boring machine with the downstream side (8) facing down. The valve body is leveled according to the plane of the upstream side (7) of the valve body. The readings at the points are the same. The valve body is adjusted to be concentric with the rotary table according to the inner and outer circles of the upstream side (7) of the valve body. After the adjustment is qualified, the valve body (1) is pressed firmly.

9. A modular processing method for a large welded valve according to claim 1, characterized in that: In S14, the valve (2) is fully open. The inner circle of the flow surface of the valve (2) is adjusted to be concentric with the inner circle of the upstream side (7) of the valve body. The valve shafts at both ends of the valve (2) are finely adjusted to be concentric with the valve body shaft holes to ensure uniform machining allowance. After the adjustment is qualified, the valve (2) is pressed firmly and the alignment result is rechecked.

10. A modular processing method for a large welded valve according to claim 1, characterized in that: In S21, the crane, in conjunction with the double-sided waist-shaped tool arm (12), rotates the valve (2) by 180°. Two positioning pins are used on each side to fix the waist-shaped tool arm (12) and the valve body (1). The two pins are distributed at 90°. The sealing seat of the downstream side (11) of the valve is CNC machined to fit the mating surface and the circle.

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