Wellhead eccentric connecting piece machining method

Abstract

The invention relates to the technical field of machining technologies, and discloses a wellhead eccentric connecting piece machining method which is used for machining a reducing eccentric connecting piece connected with an oil pipe hanger in a sealed mode, the eccentric connecting piece comprises a connecting rod and a flange part eccentrically arranged at one end, and the method comprises the following steps that S10, the end face, the outer circle and a through hole of the connecting rod are roughly machined; s20, the end face, the outer circle and the adjusting hole of the flange part are subjected to finish machining; s30, a pressure test side hole, a pressure test inclined side and a receding part are machined; s40, the connecting rod and the flange part are subjected to finish machining; wherein S10, S20 and S30 are machined on a machining center, and then the machining center is turned to a lathe to complete finish machining in S40; the problems that in the prior art, common turning precision is not high, special machining center equipment is expensive, and cost performance is not high are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of machining processes, in particular to a wellhead eccentric connecting piece machining method. BACKGROUND

[0002] In order to ensure safety in the oil production process, the wellhead device needs to be designed with an eccentric structure, and the eccentric reducing joint plays a major connecting role; however, the eccentric reducing joint needs to be machined by high-precision machining equipment and cutters due to small batch size, high precision requirement and large machining difficulty, so that the machining cost is relatively high. The machining of high-precision eccentric shaft has always been a difficulty in the machining of the mechanical industry, especially on an ordinary lathe. There are generally the following methods for machining eccentric parts on a lathe: three-jaw self-centering chuck plus gasket method, double-center method and adjustable clamp method; among them, the most commonly used method for turning eccentric shafts is the three-jaw self-centering chuck plus gasket method, the accuracy of which is low, and each workpiece needs to be repositioned, so the efficiency is low; the double-center method needs complex auxiliary work, has a narrow application range, is low in machining efficiency, high in labor intensity and high in technical requirements for operators; the adjustable clamp method, such as CN102848145A eccentric shaft machining process, can improve machining precision by using a special eccentric clamp, but the clamp structure is complex, the stability is poor, the manufacturing cost is relatively high, the machining precision is low, and the method is professional and not suitable for use. In summary, the ordinary lathe cannot meet the machining precision of the eccentric reducing joint; if high-precision machining is required, the whole needs to be completed on a multi-axis machining center, but due to small batch size, expensive machining center equipment and complex cutters, the cost is high, and the cost performance is not high; therefore, it is urgent to provide a new machining method for solving the above problems by technical personnel in the field. SUMMARY

[0003] In view of the deficiencies of the prior art, the application provides a wellhead eccentric connecting piece machining method, which simplifies the machining process, does not need to invest in complex high-precision machining centers, can guarantee high-precision machining requirements of workpieces, improves production efficiency, significantly reduces production cost, helps to realize batch production, and overcomes the problems of low turning precision of the ordinary lathe, expensive machining center equipment and low cost performance in the prior art.

[0004] In order to achieve the above purpose, the following technical solutions are adopted in the application.

[0005] The application discloses a wellhead eccentric connecting piece machining method, which is used for machining a eccentric connecting piece connected with a tubing hanger, and the eccentric connecting piece comprises a connecting rod and a flange part eccentrically arranged at one end of the connecting rod, a threaded connecting part is arranged at the other end of the connecting rod, a clearance part is arranged between the threaded connecting part and the flange part, a through hole is arranged in the center of the connecting rod, a counterbore part is arranged on the side of the through hole close to the flange part, an adjusting hole is arranged on the flange part corresponding to the clearance part, a pressure testing side hole and a pressure testing inclined side hole are arranged on the two sides of the adjusting hole, and an annular face and an annular sealing groove are arranged on the outer end face of the flange part. The machining method comprises the following steps. S10: rough machining of the end face, the outer circle and the through hole of the connecting rod; S20: fine machining of the end face, the outer circle and the adjusting hole of the flange part; S30: machining of the pressure testing side hole, the pressure testing inclined side hole and the clearance part; S40: fine machining of the connecting rod and the flange part; The S10, the S20 and the S30 are machined on a machining center, and then the S40 is completed on a lathe.

[0006] Further, the S10 comprises the following steps.

[0007] Further, the lathe is a horizontal lathe.

[0008] Further, the S20 comprises the following steps. S21: the clamping in the S10 is kept unchanged, the center of the flange part of the large end is found out and clamped and fixed, and the inner end face of the flange part is finely machined; S22: the clamping is kept unchanged, the workbench of the machining center is rotated by 180 degrees, and the counterbore part coaxially arranged with the through hole is machined on the outer end face of the flange part; S23: the clamping is kept unchanged, the outer circle, the end face and the adjusting hole of the large end flange part are finely machined.

[0009] Further, the S30 comprises the following steps. S31: a circular groove concentric with the end face is machined on the end face of the flange; S32: the workpiece is rotated, and a radial groove of the adjusting hole is machined through the center of the flange face and the center of the adjusting hole; S33: the workpiece is rotated, and a radial groove of the pressure testing side hole and a radial groove of the pressure testing inclined side hole corresponding to the pressure testing side hole and the pressure testing inclined side hole are machined through the center; S38: the radial groove of the adjusting hole is adjusted to be horizontal on the V-shaped frame, and the clearance part corresponding to the adjusting hole is laterally and vertically machined on the connecting rod.

[0010] Further, the S33 comprises: S34: rotating the workpiece on the V-shaped frame, clamping after correcting the side pressure hole radiation slot to be in a horizontal state, processing the test pressure side hole according to requirements, and processing the side hole platform surface arranged on the rear end surface of the test pressure side hole; S36: rotating the workpiece on the V-shaped frame, clamping after correcting the inclined side hole radiation slot to be in a horizontal state, rotating the workbench to align the cutter with the test pressure inclined side hole axis, processing the test pressure inclined side hole according to requirements, and processing the inclined side hole platform surface and the coaxial threaded hole on the rear end surface of the test pressure inclined side hole.

[0011] Further, the test pressure side hole is composed of a straight hole part arranged at the front end of the flange part and an inclined side hole arranged at the rear end of the flange part; after processing the test pressure side hole, the inclined side hole communicating with the straight hole part is processed synchronously and positioned, since the central axis of the inclined side hole intersects with the central axis of the straight hole part and the axis projections of the two are located on the side pressure hole radiation slot, the position of the inclined side hole is found out based on the corrected side pressure hole radiation slot, the workbench is rotated to align the cutter center with the inclined side hole center and complete the processing, and then the side hole platform surface is processed.

[0012] Further, the S40 comprises: S41: finishing the connecting rod, placing the workpiece completed in the S30 step on the lathe, clamping the large diameter end by the lathe chuck and adjusting the small end center, and then finishing the small end cylindrical surface, the thread on the threaded connection part, the cylindrical annular groove, the through hole, the small end surface and the small end surface concave annular groove; S42: keeping the above clamping, adjusting and aligning the large end center, finishing the flange part inner end surface and the step part; S45: finishing the flange part, turning over the workpiece, clamping the large diameter end by the lathe chuck and adjusting and aligning the large end center, finishing the flange part outer cylindrical surface, the annular surface and the annular sealing groove on the end surface, and removing the machining reference datum composed of the circular ring groove, the adjusting hole radiation slot, the side pressure hole radiation slot and the inclined side hole radiation slot to form the abutting installation limiting groove part of the tubing hanger.

[0013] Further, the lathe chuck is arranged in an eccentric chuck structure.

[0014] Compared with the prior art, the present application has the beneficial effects that: The application can accurately position and accurately process by giving three concentric radial grooves of the circular ring groove containing the adjusting hole, the pressure test side hole, the pressure test inclined side hole and the accommodation part corresponding to the adjusting hole on the connecting rod, forming the "one circle three radial lines" combined processing reference datum in the same center, and only needs to clamp twice to complete the small end rough machining, the large end preliminary machining and the large end structure combination positioning reference, and each hole position machining, and does not need to reposition, and only needs to rotate the leveling reference radial groove for machining, so that the machining process is simplified, the cumulative error of repeated positioning is reduced, and the accuracy of product machining is improved; Subsequent turning to the ordinary lathe for turning the small diameter end and the large diameter end can efficiently and accurately complete the relatively simple outer circle and end surface machining, and this method can complete the machining of the complex workpiece by combining the simple and common turning and milling to simplify the process, without investing in a relatively large and complex turning and milling combined machining center, so that the equipment investment cost is greatly saved. This process is reasonable and simple, can fully exert the advantages of high-precision positioning of the numerical control machining center, and combines the characteristics of high turning efficiency and good economy of the ordinary lathe to process the structures such as the outer circle, end surface, thread, gasket ring groove and end surface sealing groove of the eccentric connecting piece which are not convenient to process by the machining center. This milling and turning combination method ensures high precision, improves production efficiency, significantly reduces production cost, and helps to realize batch production. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a side view of the eccentric connecting piece of the application; Figure 2 is another side view of the eccentric connecting piece of the application; Figure 3 is a partial cross-sectional view of the eccentric connecting piece of the application; Figure 4 is an assembly view of the eccentric connecting piece of the application; Figure 5 is a schematic view of the machining center rough machining the small diameter end; Figure 6 is a schematic view of the machining center machining the large diameter end, each hole position and machining reference datum; Figure 7 is Figure 6 front view; Figure 8 is a schematic view of the machining center rough machining the small diameter end; Figure 9 is a schematic view of the machining center rough machining the small diameter end;

[0016] Figure ID: Connecting rod 1; threaded connection portion 11; yield portion 12; through hole 13; countersunk portion 131; flange portion 2; adjustment hole 21; pressure test side hole 22; pressure test inclined side hole 23; annular surface 24; annular sealing groove 25; step portion 26; straight hole portion 221; inclined side hole 222; side hole platform surface 223; inclined side hole platform surface 232; workbench 3; V-shaped frame 31; clamping structure 32; lathe jaw 4; oil tubing hanger 6; oil head pipe 7; oil tubing head top thread inner oil pipe 9; pressure gauge 10; minor diameter outer circle d0; minor diameter end face d1; major diameter outer circle D0; end face D1; annular groove D2; adjustment hole ray groove D3; inclined side hole ray groove D4; side pressure hole ray groove D5. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the combination or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0019] The present invention will be further described below with reference to the accompanying drawings and in combination with embodiments.

[0020] Figures 1-9The present invention relates to a method for processing an eccentric wellhead connector, which is used for processing a reducing eccentric connector that is sealed and connected to an oil pipe hanger 6; as shown in 1-4: the eccentric connector comprises: a connecting rod 1 and a flange portion 2 eccentrically arranged at one end, a threaded connecting portion 11 is provided at the other end of the connecting rod 1, a yielding portion 12 is provided between the threaded connecting portion 11 and the flange portion 2, a through hole 13 is provided in the center of the connecting rod 1, a countersunk head 131 is provided on the side of the through hole 13 close to the flange portion 2, an adjusting hole 21 is provided on the flange portion 2 corresponding to the yielding portion 12, a pressure test side hole 22 and a pressure test inclined side hole 23 are provided on both sides of the adjusting hole 21, an annular surface 24 and an annular sealing groove 25 are provided on the outer end face of the flange portion 2, and a step portion 26 is provided on the cylindrical surface of the flange portion 2; the reducing eccentric connector composed of the connecting rod 1 and the flange portion 2, the top surface of the flange portion 2 is in contact with one end of the oil pipe hanger 6, and is fastened and sealed with a description piece arranged outside the reducing eccentric connector through a connecting flange on an external oil head pipe 7, the oil head A tubing head top screw 8 is also provided on the pipe 7 connecting flange to ensure a sealed connection between the flange and the tubing head to prevent oil and gas leakage; when the pressure in the well rises, the top screw prevents the tubing from being pushed out due to excessive pressure through additional support; a pressure gauge 10 is installed on the pressure test side hole 22 and the pressure test inclined side hole 23 to test the gas pressure values ​​in different areas, which can timely detect gas leakage inside the connector; wherein, the through hole 13 is connected to the hole on the tubing hanger 6 for connecting the inner tubing 9; the adjustment hole 21 is set to correspond to the hole on one side of the tubing hanger 6. During installation, a diameter gauge is used to measure whether there is an error in the fit between the adjustment hole 21 and the hole on one side of the tubing hanger 6 and adjust it to ensure that the through hole 13 and the inner tubing 9 are installed coaxially, accurately and reliably.

[0021] The processing method comprises the following steps: S10: Rough machining the end face, outer circle and through hole 13 of the connecting rod 1; Figure 5 As shown, the small end of the blank is placed on the V-shaped frame 31 on the workbench 3 of the machining center for leveling. The center of the small end is adjusted to coincide with the center of the spindle and the small diameter end is clamped by the clamping structure 32. The small diameter outer circle d0, the small diameter end surface d1 and the through hole 13 are rough-machined, and a machining allowance is left. The outer diameter of the rough-machined connecting rod 1 is 168 mm, the length is 50 mm, and the machining allowance is 3 mm. S20: Finishing the end face D1, large diameter outer circle D0 and adjustment hole 21 of the flange part 2; Specific: such as Figure 6 As shown, S20 includes: S21: Keep the clamping in S10 unchanged, adjust the eccentricity to find the center of the large end flange 2 and clamp it, and then finish the inner end surface of the flange 2; S22: Keeping the clamping unchanged, the machining center table 3 is rotated 180 degrees, and a countersunk head 131 coaxially arranged with the through hole 13 is machined on the outer end surface of the flange portion 2; S23: Keeping the clamping unchanged, finish-machine the outer circle D0, end surface D1 and adjustment hole 21 of the large end flange 2; the machining length of the outer circle D0 is 50 mm and the diameter is 420 mm; S30: Processing the pressure test side hole 22, the pressure test inclined side 23 and the clearance portion 12; Specific: such as Figure 6 、 7 As shown, S30 includes: S31: A circular groove D2 concentric with the end face of the flange is machined on the end face; S32: Rotate the workpiece to machine an adjustment hole ray groove D3 through the center of the flange surface and the center of the adjustment hole 21; S33: rotating the workpiece to machine the side pressure hole ray groove D5, the oblique side hole ray groove D4, the side pressure hole 22, and the oblique side pressure hole 23 corresponding to the side pressure hole 22 and the oblique side pressure hole 23 through the center of the circle; S38: Adjust the adjustment hole ray groove D3 to a horizontal state on the V-shaped frame, and vertically process the clearance portion 12 corresponding to the adjustment hole 21 on the connecting rod 1; S40: Finishing the connecting rod 1 and the flange 2; specifically: Figure 8 As shown, S40 includes: S41: Finishing the connecting rod 1: Place the workpiece completed in step S30 on a lathe, clamp the large diameter end with the lathe jaws and adjust the center of the small end, and then finish-machine the outer cylindrical surface of the small end, the threads on the threaded connection part 11, the cylindrical annular groove, the through hole 13, the end face of the small end, and the concave annular groove of the small end face; S42: Finishing step: Figure 8 As shown, keep the above clamping, adjust and align the center of the large end, and finish the inner end surface of the flange part 2 and the step part 26; S45: Finishing flange 2: Figure 9 As shown, the workpiece is turned over, the large diameter end is clamped by the lathe jaws and the center of the large end is adjusted and aligned, the outer cylindrical surface of the flange part 2, the annular surface 24 and the annular sealing groove 25 on the end face are finely machined, and the machining reference datum composed of the annular groove D2, the adjustment hole ray groove D3, the side pressure hole ray groove D5 and the oblique side hole ray groove D4 is removed to form a limiting groove part for abutting the tubing hanger; S42 and the workpiece can be changed and re-processed after S45.

[0022] Among them, S10, S20 and S30 are processed on the machining center and then transferred to the lathe for finishing. The lathe is set as a horizontal lathe, preferably Rongtian VR38-1700. The machining center is set as a general milling machining center, preferably South Korea's Doosan 80 machining center.

[0023] The application can accurately position and precisely process by giving three concentric radial grooves of the circular ring groove D2 containing the adjusting hole 21, the pressure side hole 22, the pressure inclined side hole 23 and the accommodation part 12 corresponding to the adjusting hole 21 arranged on the connecting rod, forming the "one circle three radial line" combined processing reference datum in the same center, which can accurately position and precisely process, and only needs to clamp twice to complete the rough machining of the small end, the preliminary machining of the large end and the large end structure combination positioning reference, and the machining of each hole position, without the need for repositioning, only need to rotate the leveling reference radial groove for machining, which simplifies the processing flow, reduces the cumulative error of repeated positioning, and improves the accuracy of product processing. Subsequent turning to the ordinary lathe for turning the small diameter end and the large diameter end can efficiently and accurately complete the relatively simple cylindrical surface and end surface machining. This method simplifies the process to complete complex workpiece machining by combining simple and commonly used turning and milling, without the need to invest in a relatively large and complex turning and milling combined machining center, greatly saving equipment investment cost. This process is reasonable and simple, which can fully play the advantages of high-precision positioning of the numerical control machining center, and combine the characteristics of high efficiency and economy of the ordinary lathe to process the structures such as the cylindrical surface, end surface, thread, gasket ring groove and end surface sealing groove of the eccentric connecting piece which are not convenient to process by the machining center. This milling and turning combination method ensures high precision, improves production efficiency, significantly reduces production cost, and helps to realize batch production.

[0024] In an optional embodiment, S33 includes: S34: Turn the workpiece on the V-shaped frame, clamp after correcting the side pressure hole radial groove D5 to be in a horizontal state, process the pressure side hole 22 as required, and process the side hole platform surface 223 arranged on the rear end surface of the pressure side hole 22; S36: Turn the workpiece on the V-shaped frame, clamp after correcting the inclined side hole radial groove D4 to be in a horizontal state, rotate the worktable to align the tool with the pressure inclined side hole 23 axis, process the pressure inclined side hole 23 as required, and process the inclined side hole platform surface 232 and the coaxial threaded hole 231 on the rear end surface of the pressure inclined side hole 23.

[0025] An alternative embodiment, the pressure side hole 22 is composed of a straight hole part 221 arranged at the front end of the flange part 2 and an inclined side hole 222 arranged at the rear end of the flange part 2; after processing the pressure side hole 22, the inclined side hole 222 communicated with the straight hole part 221 is processed synchronously, since the central axis of the inclined side hole 222 intersects with the central axis of the straight hole part 221 and the axis projection of both is on the side pressure hole radial groove D5, the inclined side hole 222 position is found out with the leveled side pressure hole radial groove D5 as the reference, the worktable is rotated to make the cutter center align with the inclined side hole 222 center and the processing is completed, wherein the inclined side hole 222 is a threaded hole, and then the side hole platform surface 223 is processed.

[0026] An alternative embodiment: the lathe chuck jaw 4 is arranged as a lathe eccentric chuck jaw structure; since the flange part 2 is large in size and heavy in mass, in order to ensure stable clamping, the stress center is at the flange center, and the eccentric four chuck jaw structure is preferred for clamping.

[0027] The embodiments of the present application disclose the preferred embodiments, but are not limited thereto, and the ordinary skilled in the art can easily understand the spirit of the present application according to the above-mentioned embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, they are within the protection scope of the present application.

Claims

1. A method for processing a wellhead eccentric connector, used for processing a reducing eccentric connector for sealing connection with a tubing hanger, characterized by: The eccentric connecting member comprises: a connecting rod (1) and a flange portion (2) eccentrically arranged at one end, the connecting rod (1) is provided with a threaded connecting portion (11) at the other end, a relief portion (12) is provided between the threaded connecting portion (11) and the flange portion (2), a through hole (13) is provided at the center of the connecting rod (1), a countersunk portion (131) is provided on the side of the through hole (13) close to the flange portion (2), an adjustment hole (21) is provided on the flange portion (2) corresponding to the relief portion (12), a pressure test side hole (22) and a pressure test inclined side hole (23) are provided on both sides of the adjustment hole (21), an annular surface (24) and an annular sealing groove (25) are provided on the outer end surface of the flange portion (2), and a step portion (26) is provided on the cylindrical surface of the flange portion (2); The processing method comprises the following steps: S10: Rough machining of the end face, outer circle and through hole (13) of the connecting rod (1); S20: Finishing the flange (2) end face, outer circle and adjustment hole (21); S30: Processing the pressure test side hole (22), the pressure test inclined side (23) and the yielding portion (12); S40: Finishing the connecting rod (1) and flange (2); The S10, S20 and S30 are processed on a machining center and then transferred to a lathe to complete the S40 finishing process.

2. The method for processing an eccentric connector according to claim 1, characterized in that: Said S10: placing the small end of the blank on the V-shaped frame of the machining center for leveling, adjusting the center of the small end to coincide with the center of the spindle and clamping, rough machining the outer circle, end face and through hole (13), and leaving machining allowance.

3. The method for processing an eccentric connector according to claim 1, characterized in that: The lathe is a horizontal lathe.

4. The method for processing an eccentric connector according to claim 1, wherein: The S20 includes: S21: Keep the clamping in S10 unchanged, adjust the eccentricity to find the center of the large end flange (2) and clamp it, and then finish the inner end surface of the flange (2); S22: Keeping the clamping unchanged, the machining center table is rotated 180 degrees, and a countersunk head (131) coaxially arranged with the through hole (13) is machined on the outer end surface of the flange (2); S23: Keep the clamping unchanged and finish the outer circle, end face and adjustment hole (21) of the large end flange (2).

5. The method for processing an eccentric connector according to claim 1, characterized in that: The S30 includes: S31: A circular groove (D2) is machined on the flange end face, which is concentric with the end face; S32: Rotate the workpiece to machine an adjusting hole radial groove (D3) through the center of the flange surface and the center of the adjusting hole (21); S33: rotating the workpiece, and machining the side pressure hole ray groove (D5), the oblique side hole ray groove (D4), the pressure test side hole (22), and the pressure test oblique side hole (23) corresponding to the pressure test side hole (22) and the pressure test oblique side hole (23) through the center of the circle; S38: Adjust the adjustment hole ray groove (D3) to a horizontal state on the V-shaped frame, and vertically process the lateral clearance portion (12) corresponding to the adjustment hole (21) on the connecting rod (1).

6. The method for processing an eccentric connector according to claim 5, characterized in that: The S33 includes: S34: Rotate the workpiece on the V-shaped frame, correct the side pressure hole ray groove (D5) to a horizontal state and then clamp it, process the pressure test side hole (22) as required, and process the side hole platform surface (223) set on the rear end surface of the pressure test side hole (22); S36: Rotate the workpiece on the V-shaped frame, correct the oblique side hole ray groove (D4) to a horizontal state and then clamp it, rotate the workbench to align the tool with the axis of the pressure test oblique side hole (23), and process the pressure test oblique side hole (23) as required. At the same time, process the oblique side hole platform surface (232) and the coaxial threaded hole (231) on the rear end surface of the pressure test oblique side hole (23).

7. The method for processing an eccentric connector according to claim 6, characterized in that: The pressure test side hole (22) is composed of a straight hole portion (221) provided at the front end of the flange portion (2) and an oblique side hole (222) provided at the rear end of the flange portion (2) in communication. After the pressure test side hole (22) is processed, the oblique side hole (222) communicating with the straight hole portion (221) is synchronously positioned and processed. Since the central axis of the oblique side hole (222) intersects with the central axis of the straight hole portion (221) and the projections of the axes of the two are both on the side pressure hole ray groove (D5), the position of the oblique side hole (222) is accurately found with the side pressure hole ray groove (D5) after leveling as a reference, the workbench is rotated so that the center of the tool is aligned with the center of the oblique side hole (222) and the processing is completed, and then the side hole platform surface (223) is processed.

8. The method for processing an eccentric connector according to any one of claims 1 to 7, characterized in that: The S40 includes: S41: Finishing the connecting rod (1): Place the workpiece completed in step S30 on a lathe, clamp the large diameter end with the lathe jaws (4) and adjust the center of the small end, and then finish-machine: the outer cylindrical surface of the small end, the thread on the threaded connection part (11), the cylindrical ring groove, the through hole (13), the end face of the small end and the concave ring groove of the small end face; S42: Maintaining the above clamping, adjusting and aligning the center of the large end, and finishing the inner end surface of the flange portion (2) and the step portion (26); S45: Finishing the flange part (2): Turn the workpiece around, clamp the large diameter end with the lathe jaws (4) and adjust and align the center of the large end, finish the outer cylindrical surface of the flange part (2), the annular surface (24) on the end face and the annular sealing groove (25), and remove the machining reference datum composed of the annular groove (D2), the adjustment hole ray groove (D3), the side pressure hole ray groove (D5) and the oblique side hole ray groove (D4) to form a limit groove part for abutting the tubing hanger.

9. The method for processing an eccentric connector according to claim 8, characterized in that: The lathe clamping jaw (4) is configured as an eccentric clamping jaw structure.

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