Tooling for spray needle processing and lifting, transition piece for spray needle processing, and method

Abstract

The present invention discloses a tooling for the processing and lifting of a spray needle, a transition piece for the processing of the spray needle, and a method, which relate to the fields of spray needle processing and assembly. The tooling includes an alignment template and a fastening ring plate. The top of the alignment template has a fitting table, and the table surface of the fitting table has a boss. The outside of the fitting table is a tool withdrawal space. The geometric tolerances of the table surface, the side surface, and the boss of the fitting table match the geometric tolerances of the outer cylindrical surface, the large end surface, and the stop of the large diameter section of the spray needle. The fastening ring plate has a tapered hole. The fastening ring plate and the alignment template are locked by a locking member. A cylindrical table for being clamped is arranged on the surface of the transition piece. The axis of the cylindrical table is collinear with the axis of the transition piece, and the center of gravity of the transition piece is located within the geometry of the clamping table. The spray needle is processed by the cooperation of the transition piece and the tooling. The present invention will not damage the flow-through surface, making the profile of the flow-through surface closer to the theoretical profile. At the same time, it effectively improves the machining accuracy of the perpendicularity and coaxiality of the outer cylindrical surface and the large end surface plane.

Description

Technical Field

[0001] The invention relates to the field of spray needle processing and assembly, in particular to a tooling for spray needle processing and lifting, and a transition piece and method for spray needle processing. Background Art

[0002] The spray needle plays an important role in the impulse turbine, such as water guiding and load regulation. Due to the large size of the impulse turbine, the weight of its spray needle is as high as several hundred kilograms, and it has a conical shape, a large diameter section and a pointed end. Since the outer surface of the spray needle serves as the flow surface of the fluid, and the assembly requirements of the spray needle require that the flow surface be not damaged as much as possible during processing, and the flow surface line shape should be kept consistent as much as possible. On the other hand, the verticality between the large end face of the large diameter section and the outer circle of the large diameter section, as well as the coaxiality between the large end face of the large diameter section (the stop opened on the large end face of the large diameter section) and the outer circle of the large diameter section are required to be relatively high to meet the process and assembly requirements.

[0003] At present, the blank of the spray needle is processed from a cylindrical blank, and the shape is conical, the small end of which has a small cylindrical section with a small diameter, the large end has a large cylindrical section with a large diameter, and the large end is processed with a tapered hole coaxial with the tapered axis; the processing method of the spray needle is as follows: the first step is to perform rough processing on a lathe, that is, use a chuck to clamp the small end of the spray needle, and then use a plug to support the tapered hole at the large end of the spray needle, so that the plug cooperates with the chuck to support the spray needle to fix the spray needle; after the fixation is completed, the lathe is used to perform rough processing and semi-finishing processing on the flow surface and the large end. The processing of the large end includes The outer cylindrical surface and the large end surface are used as the alignment reference; the second step is to lift the rough-machined spray needle blank and clamp it on the boring machine. The clamping method is the same as that on the lathe. Then, the boring machine is used to fine-machine the large end plane and the stopper on the large end surface, as well as the installation screw holes on the large end surface, with the large end outer circle as the reference; the third step is to lift the workpiece processed in the second step and clamp it on the lathe, use the chuck to clamp the large end outer circle or the outer circle of the plug, and the small end is suspended. Then, the conical surface (flow surface) is processed, and the small cylindrical section at the small end is cut off. In the above processing steps, it can be known that the workpiece needs to be lifted and turned over. At the same time, it also needs to be lifted and turned over in actual assembly; and the surface of the spray needle after processing is high in precision and low in roughness. Direct lifting is easy to damage the precision and roughness of the spray needle surface; for this reason, the currently commonly used lifting and turning scheme is to process threaded holes on the outer cylindrical surface or the flow surface of the large diameter section, and install lifting rings on the threaded holes for lifting and turning over.

[0004] In practice, the above-mentioned prior art has the following problems:

[0005] First: Due to the existence of the threaded hole, the overall rigidity and strength of the injection needle will be weakened; and in order to keep the profile of the flow-through surface consistent, a plug needs to be used to block it. However, it is difficult to make the profile of the flow-through surface consistent with the plug, and it is more likely to cause cavitation damage and lead to water leakage.

[0006] Second: During the machining process, due to the existing clamping method, the outer cylindrical surface of the large-diameter section, the large end face plane, and the stop are not machined on the same machine tool. Therefore, the perpendicularity and coaxiality accuracy between the outer cylindrical surface and the large end face plane are not high.

[0007] Therefore, a new technical solution needs to be provided for the machining and hoisting of the injection needle. Summary of the Invention

[0008] The purpose of the present invention is to provide a tooling for the machining and lifting of the injection needle, a transition piece and a method for the machining of the injection needle, which will not damage the flow-through surface and make the profile of the flow-through surface closer to the theoretical profile; at the same time, effectively improve the machining accuracy of the perpendicularity and coaxiality between the outer cylindrical surface and the large end face plane.

[0009] The technical solution adopted by the present invention is as follows: A tooling for the machining and lifting of the injection needle, which is in a conical structure after the machining of the injection needle is completed, with a tip and a large-diameter section at both ends, and the large-diameter section has a large end face with a stop; it includes an alignment template and a fastening ring plate; among them:

[0010] The top of the alignment template has a fitting table that can fit with the large end face. The table surface of the fitting table has a boss that is in an interference fit with the stop. The outside of the fitting table is a tool withdrawal space, and the diameter of the outer side wall of the fitting table is smaller than the outer diameter of the large-diameter section; the geometric tolerances of the table surface, side surface and boss of the fitting table match the geometric tolerances of the outer cylindrical surface, large end face and stop of the large-diameter section of the injection needle.

[0011] The fastening ring plate has a tapered hole, and the taper of the tapered hole matches the taper of the injection needle.

[0012] The fastening ring plate and the alignment template are locked by a locking member.

[0013] Furthermore, a rubber backing plate is arranged in the tapered hole.

[0014] Furthermore, the locking member is a screw and a nut. One end of the screw is fixed on the alignment template, and a through hole for the screw to pass through is arranged on the fastening ring plate. The other end of the screw passes through the through hole and is connected to the nut, and the size of the nut is larger than the aperture of the through hole.

[0015] Further, a plurality of countersunk through holes are formed in the alignment template, the axes of the countersunk through holes are parallel to the axis of the alignment template, a connecting screw for threadedly connecting with the injection needle is provided in each countersunk through hole, and the distribution of the countersunk through holes is the same as the distribution of the screw holes on the large end face; or / and a jacking hole is provided on the alignment template, and the axis of the jacking hole is parallel to the axis of the boss.

[0016] Further, a plurality of countersunk through holes or / and jacking holes are circumferentially arrayed centered on the axis of the boss.

[0017] Further, lifting ring screw holes are provided on the sides of both the alignment template and the fastening ring plate.

[0018] Further, a lifting screw hole is provided on the alignment template.

[0019] A transition piece for the processing of an injection needle, the transition piece has a conical structure, the front end of the transition piece has a small cylindrical section, the rear end of the transition piece is a large cylindrical end, and the diameter of the small cylindrical section is smaller than the diameter of the large cylindrical end; a cylindrical platform for being clamped is provided on the surface of the transition piece, the axis of the cylindrical platform is collinear with the axis of the transition piece, and the center of gravity of the transition piece is located within the geometry of the clamping platform.

[0020] Further, an installation hole is formed at the end face of the large cylindrical end, and the axis of the installation hole is collinear with the axis of the transition piece.

[0021] A method for processing an injection needle, using the tooling for the processing and lifting of the injection needle, and the transition piece for the processing of the injection needle; including the following steps:

[0022] S1: Machining a blank into a transition piece;

[0023] S2: Clamping the cylindrical platform by a chuck;

[0024] S3: Rough machining, semi-finishing machining and finishing machining the outer circumferential surface, end face and stop of the large cylindrical end in sequence by using a lathe, and using the outer circumferential surface as the alignment reference to make the geometric tolerances of the outer circumferential surface, end face and stop of the large cylindrical end meet the requirements, and completing the machining of the large diameter section;

[0025] S4: Clamping the transition piece machined in step S3 by using the tooling, lifting the machined transition piece for turning around, and using the chuck to clamp the alignment template, removing the parts of the remaining tooling, and making the small cylindrical section of the machined transition piece suspended;

[0026] S41: In step S4, verifying the geometric tolerances of the boss, stop and outer circumferential surface by measuring the distance between the side surface of the fitting platform and the outer circumferential surface of the large diameter section;

[0027] S5: Using a lathe, starting from the intersection of the outer cylindrical surface and the end face of the large cylindrical end, finely machine the conical surface of the transition piece, and at the same time cut off the cylindrical platform and the small cylindrical section to complete the machining of the flow-through surface.

[0028] S6: Remove the alignment template. Based on the position connected by the connecting screws, further drill and tap the screw holes on the end face at the large-diameter section to complete the machining of the injection needle.

[0029] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0030] 1. The present invention is provided with a tooling, which can effectively assist the lifting and flipping of the injection needle during the machining and assembly of the injection needle. There is no need to design screw holes and plugs on the flow-through surface, the structure is simpler, and the profile of the flow-through surface is closer to the theoretical profile.

[0031] 2. By setting a cylindrical platform in the present invention, when machining the injection needle, there is no need to use a plug to cooperate with the chuck to tightly hold the injection needle for machining. Without a plug, the machining of the outer cylindrical surface, end face and stop of the large cylindrical section can be completed at one time, and there is no need to replace the clamping and machining equipment. Therefore, the accuracy of the outer cylindrical surface, end face and stop in terms of geometric tolerance is higher and can better meet the design requirements.

[0032] 3. The tooling disclosed in the present invention functions as a fixture during machining and as a lifting tool during assembly. It has a high degree of integration, a simple structure, convenient operation, and does not damage the surface of the injection needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be described by way of examples with reference to the accompanying drawings, where:

[0034] Figure 1 is a schematic diagram of the tooling disclosed in the present invention;

[0035] Figure 2 is a schematic structural diagram of the alignment template disclosed in the present invention;

[0036] Figure 3 is a schematic structural diagram and a machining schematic diagram of the transition piece disclosed in the present invention;

[0037] Markings in the figures: 1 - transition piece; 11 - cylindrical platform; 12 - large cylindrical section; 121 - screw hole; 122 - mounting hole; 13 - small cylindrical section; 2 - injection needle; 21 - flow-through surface; 22 - large-diameter section; 221 - large end face; 222 - stop; 223 - screw hole; 3 - alignment template; 31 - fitting table; 32 - boss; 33 - relief space; 34 - jacking hole; 35 - countersunk through hole; 36 - connecting screw; 37 - lifting screw hole; 4 - fastening ring plate; 41 - rubber cushion plate; 5 - screw rod; 51 - nut; 6 - lifting ring screw hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In the description of this specification, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this specification is usually placed during use. This is only for the convenience of describing this specification and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this specification.

[0039] In addition, in the description of this specification, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that this structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of this specification, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "linked" are used, they should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0041] Embodiment 1

[0042] As Figure 1 - Figure 2 shown, a tooling for the processing and lifting of a spray needle can be used for the positioning and alignment, lifting and turning over of the spray needle 2 during processing, and has the function of a processing fixture; it can also be used for actions such as lifting and turning over of the spray needle 2 when assembling it to the water turbine unit, and has the function of a lifting tool. After the spray needle 2 is processed, it has a conical structure, with its two ends being a tip and a large-diameter section 22 respectively. The large-diameter section 22 has a large end face 221, and there is a stop 222 at the large end face 221. The axis of the stop 222 is collinear with the axes of the large-diameter section 22 and the spray needle 2, and there are requirements for geometric tolerances between the large end face 221 of the large-diameter section 22 and the outer circle of the large-diameter section 22.

[0043] In this embodiment, the tooling includes an alignment template 3 and a fastening ring plate 4; specifically as follows.

[0044] The top of the alignment template 3 has a fitting table 31 that can fit with the large end face 221. The table surface of the fitting table 31 has a boss 32 that is in an interference fit with the rabbet 222. The thickness of the boss 32 is the same as the depth of the rabbet 222 of the injection needle 2, so that the large end face 221 can fit with the surface of the fitting table 31. The outer side of the fitting table 31 is a relief space 33, and the diameter of the outer side wall of the fitting table 31 is smaller than the outer diameter of the large diameter section 22. The geometric tolerances of the table surface, side surface of the fitting table 31 and the boss 32 match the geometric tolerances of the outer circular surface, large end face 221 and rabbet 222 of the large diameter section 22 of the injection needle 2.

[0045] The fastening ring plate 4 has a tapered hole, and the taper of the tapered hole matches the taper of the injection needle 2.

[0046] The fastening ring plate 4 and the alignment template 3 are locked by a locking member.

[0047] In this embodiment, through the interference fit, the outer side surface of the boss 32 is closely attached to the inner wall of the rabbet 222, and the table surface of the fitting table 31 fits the large end face 221, realizing the positioning and constraint of the injection needle 2, so that the injection needle 2 will not shake during subsequent processing, ensuring the machining accuracy of the outer side surface (flow-through surface 21) of the injection needle 2, and the axis of the flow-through surface 21 can be collinear with the axis of the boss 32 or the rabbet 222 to meet the geometric requirements; the relief space 33 is provided mainly to prevent the intersection line between the large end face 221 and the outer circular surface of the large diameter section 22 from being interfered. When machining the flow-through surface 21, a complete flow-through surface 21 can be machined in one go starting from this intersection line.

[0048] It should be noted that when installing the injection needle 2 on this tooling, whether during the machining of the injection needle 2 or when the injection needle 2 is assembled into the water turbine unit, it can be verified whether the injection needle 2 is correctly installed on the alignment template 3 by measuring whether the dimension between the outer circular surface of the large diameter section 22 and the side surface of the fitting table 31 meets the requirements with a dial indicator. That is, if the dimension meets the requirements, it means that the injection needle 2 has been installed in place, and the subsequent machining of the flow-through surface 21 can meet the requirements of the designed geometric tolerances; otherwise, the injection needle 2 needs to be re-clamped.

[0049] In this embodiment, the fastening ring plate 4 is mainly used when lifting the injection needle 2. It sleeves the tapered surface of the injection needle 2 and cooperates with the alignment placenta to realize the clamping of the injection needle 2. When lifting, the lifting force can be applied to the fastening ring plate 4 and the alignment template 3, without the need to machine a lifting connection point on the injection needle 2. That is, this method does not require designing a screw hole 223 and a plug on the flow-through surface 21, the structure is simpler, and the profile of the flow-through surface 21 is closer to the theoretical profile.

[0050] Embodiment 2

[0051] On the basis of Embodiment 1, further specific implementation methods are proposed.

[0052] In a feasible implementation manner, a rubber backing plate 41 is arranged inside the tapered hole to prevent the inner wall of the tapered hole from damaging the tapered flow-through surface 21, playing a protective role.

[0053] In a feasible implementation manner, the locking member is a screw 5 and a nut 51. One end of the screw 5 is fixed on the alignment template 3. A through hole for the screw 5 to pass through is provided on the fastening ring plate 4. The other end of the screw 5 passes through the through hole and is connected to the nut 51. The size of the nut 51 is larger than the aperture of the through hole. The locking of the fastening ring plate 4 and the alignment template 3 is realized through the nut 51. With the mutual restraint between the fastening ring plate 4 and the injection needle 2, the clamping of the injection needle 2 is effectively realized.

[0054] In a feasible implementation manner, a plurality of counterbored through holes 35 are formed on the alignment template 3. The axis of the counterbored through hole 35 is parallel to the axis of the alignment template 3. A connecting screw 36 for threadedly connecting with the injection needle 2 exists in each counterbored through hole 35, and the distribution of the counterbored through holes 35 is consistent with the distribution of the screw holes 223 on the large end face 221. Specifically, when machining the large end face 221, screw holes 121 can be machined at corresponding positions on the injection needle 2. After the connecting screw 36 passes through the counterbored through hole 35, it is connected to the screw hole 121, realizing the circumferential restraint of the injection needle 2 and the connection between the injection needle 2 and the alignment template 3, ensuring that when machining the flow-through surface 21 subsequently, the circumferential position of the injection needle 2 is stable and there is no relative rotation between the injection needle 2 and the alignment template 3 under the action of the tool.

[0055] It should be noted that the size of the screw hole 121 needs to be smaller than the screw hole 223 on the large end face 221, and the position is consistent with the screw hole 223. Subsequently, when machining the screw hole 223 on the large end face 221, further machining can be directly carried out at the screw hole 121, without adding new machining position points to the end face of the large end face 221.

[0056] In a feasible implementation manner, a jacking hole 34 is arranged on the alignment template 3. The axis of the jacking hole 34 is parallel to the axis of the boss 32, which is convenient for subsequent disassembly of the injection needle 2. The injection needle 2 can be disassembled by pushing the injection needle 2 through the jacking hole 34 with a tool.

[0057] Furthermore, a plurality of counterbored through holes 35 or / and jacking holes 34 are circumferentially arrayed centered on the axis of the boss 32, so that the force distribution is uniform.

[0058] In a feasible implementation manner, lifting ring screw holes 6 are arranged on the sides of both the alignment template 3 and the fastening ring plate 4. By installing lifting rings in the lifting ring screw holes 6, the tooling with the injection needle 2 installed can be lifted, realizing the lifting and flipping of the injection needle 2.

[0059] A feasible implementation method is that lifting screw holes 37 are provided on the alignment template 3, and a lifting tool is connected to the lifting screw holes 37 to achieve the lifting of the alignment template 3.

[0060] Embodiment 3

[0061] As Figure 3 shown, a transition piece for the processing of a spray needle. The transition piece 1 has a conical structure, and its size is close to the design size of the spray needle 2, reducing the subsequent processing amount; the front end of the transition piece 1 has a small cylindrical section 13, the rear end of the transition piece 1 is a large cylindrical end, and the diameter of the small cylindrical section 13 is smaller than the diameter of the large diameter section 22; a cylindrical platform 11 for being clamped is arranged on the surface of the transition piece 1. The axis of the cylindrical platform 11 is collinear with the axis of the transition piece 1, and the center of gravity of the transition piece 1 is located within the geometric center of the clamping platform. It can be determined that the cylindrical platform 11 is arranged between the large cylindrical section 12 and the small cylindrical section 13.

[0062] In this embodiment, when processing the large cylindrical section 12 to form the large diameter section 22, since the clamping position is at the cylindrical platform 11 and there is no structure or part at the large cylindrical section 12, it will not cause position interference to the comprehensive and all-round processing of the large cylindrical section 12, that is, the outer circle surface, end face and stop 222 of the large cylindrical section 12 can be processed at one time, so as to form the large diameter end of the spray needle 2; there is no need to replace the processing equipment and the clamping station during processing, so that the form and position tolerance of the processed large diameter section 22 can be closer to or even meet the design requirements.

[0063] In this embodiment, the cylindrical platform 11 is provided, and it is required that the center of gravity of the transition piece 1 is within the cylindrical platform 11. The purpose is to be able to stably clamp the transition piece 1; if a chuck is used to clamp the cylindrical platform 11 and the center of gravity of the transition piece 1 is within the chuck, the transition piece 1 can be stably clamped; of course, in practice, if it is impossible to make the cylindrical platform 11 surround the center of gravity, the center of gravity may not be within the cylindrical platform 11, but it needs to be as close to the cylindrical platform 11 as possible.

[0064] A feasible implementation method is that an installation hole 122 is provided at the end face of the large cylindrical section 12. The axis of the installation hole 122 is collinear with the axis of the transition piece 1. The installation hole 122 is used to facilitate the subsequent processing of the stop 222 and adjust the position of the center of gravity of the transition piece 1.

[0065] A feasible implementation method is that a screw hole 121 as described above is provided at the end face of the large cylindrical section 12.

[0066] Embodiment 4

[0067] As Figure 3 shown, a method for processing a spray needle uses the tooling for spray needle processing and lifting described in any one of Embodiments 1-2, and the transition piece for spray needle processing described in Embodiment 3; includes the following steps:

[0068] S1: Process the blank into the transition part 1;

[0069] S2: Clamp the cylindrical platform 11 with a chuck;

[0070] S3: Use a lathe to rough machine, semi-finish machine and finish machine the outer cylindrical surface, end face and stop 222 of the large cylindrical end in sequence, and use the outer cylindrical surface as the alignment reference to make the geometric tolerances of the outer cylindrical surface, end face and stop 222 of the large cylindrical end meet the requirements, and complete the machining of the large diameter section 22;

[0071] S4: Use a fixture to clamp the transition part 1 processed in step S3, lift the processed transition part 1 to turn it around, and use a chuck to clamp and align the template 3, remove the parts of the remaining fixtures, and the small cylindrical section 13 of the processed transition part 1 is suspended;

[0072] S41: In step S4, verify the concentricity of the boss 32, stop 222 and outer cylindrical surface by measuring the distance between the side surface of the fitting table 31 and the outer cylindrical surface of the large diameter section 22;

[0073] S5: Use a lathe to start from the junction of the outer cylindrical surface and the end face of the large cylindrical end to finish machine the conical surface of the transition part 1, and at the same time cut off the cylindrical platform 11 and the small cylindrical section 13 to complete the machining of the flow-through surface 21.

[0074] S6: Remove the alignment template 3, and based on the position connected with the connecting screw 36, further drill and tap the screw hole 223 on the end face at the large diameter section 22 to complete the machining of the injection needle 2.

[0075] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A method for manufacturing a spray needle. After the spray needle (2) is manufactured, it has a conical structure, with its two ends being a tip and a large-diameter section (22) respectively. The large-diameter section (22) has a large end face (221), and a stop groove (222) is provided at the large end face (221); it is characterized in that, It includes the following steps: S1: Process the blank into a transition piece (1); the transition piece (1) has a conical structure. The front end of the transition piece (1) has a small cylindrical section, and the rear end of the transition piece (1) is a large cylindrical end. The diameter of the small cylindrical section is smaller than the diameter of the large cylindrical section (12); a cylindrical platform (11) for being clamped is arranged on the surface of the transition piece (1). The axis of the cylindrical platform (11) is collinear with the axis of the transition piece (1), and the center of gravity of the transition piece (1) is located within the geometry of the clamping platform; S2: Clamp the cylindrical platform (11) using a chuck; S3: Use a lathe to successively rough machine, semi-finish machine, and finish machine the outer cylindrical surface, end face, and stop (222) of the large cylindrical end, and use the outer cylindrical surface as the alignment reference to make the geometric tolerances of the outer cylindrical surface, end face, and stop (222) of the large cylindrical end meet the requirements, thus completing the machining of the large-diameter section (22); S4: Use a tooling to clamp the transition piece (1) processed in step S3, lift the processed transition piece (1) to turn it around. The tooling includes an alignment template (3) and a fastening ring plate (4); where: The top of the alignment template (3) has a fitting platform (31) that can fit with the large end face (221). The table surface of the fitting platform (31) has a boss (32) that is in an interference fit with the stop (222). The outside of the fitting platform (31) is a tool withdrawal space (33), and the diameter of the outer side wall of the fitting platform (31) is smaller than the outer diameter of the large-diameter section (22); the geometric tolerances of the table surface, side surface, and boss (32) of the fitting platform (31) match the geometric tolerances of the outer cylindrical surface, large end face (221), and stop (222) of the large-diameter section (22) of the injection needle (2); The fastening ring plate (4) has a tapered hole, and the taper of the tapered hole matches the taper of the injection needle (2); The fastening ring plate (4) and the alignment template (3) are locked by a locking member; Use a chuck to clamp the alignment template (3), remove the parts of the other toolings, and the small cylindrical section of the processed transition piece (1) is suspended; S41: In step S4, verify the geometric tolerances of the boss (32), stop (222), and outer cylindrical surface by measuring the distance between the side surface of the fitting platform (31) and the outer cylindrical surface of the large-diameter section (22); S5: Use a lathe to start from the junction of the outer cylindrical surface and the end face of the large cylindrical end, finish machine the conical surface of the transition piece (1), and at the same time cut off the cylindrical platform (11) and the small cylindrical section to complete the machining of the flow-through surface (21); S6: Remove the alignment template (3), and based on the position connected to the connecting screw (36), further drill and tap the screw hole (223) on the end face at the large-diameter section (22) to complete the machining of the injection needle (2).

2. The method according to claim 1, wherein: A rubber cushion plate (41) is arranged in the tapered hole.

3. The method according to claim 1, wherein: The locking member is a screw (5) and a nut (51). One end of the screw (5) is fixed on the alignment template (3). The fastening ring plate (4) is provided with a through hole for the screw (5) to pass through. The other end of the screw (5) passes through the through hole and is connected to the nut (51). The size of the nut (51) is larger than the aperture of the through hole.

4. The method according to claim 1, wherein: A plurality of counterbored through holes (35) are formed in the alignment template (3), and the axes of the counterbored through holes (35) are parallel to the axis of the alignment template (3). A connecting screw (36) for threaded connection with the injection needle (2) is provided in each counterbored through hole (35), and the distribution of the counterbored through holes (35) is consistent with the distribution of the screw holes (223) on the large end face (221); or / and a jacking hole (34) is provided on the alignment template (3), and the axis of the jacking hole (34) is parallel to the axis of the boss (32).

5. The method according to claim 4, wherein: The plurality of counterbored through holes (35) or / and the jacking holes (34) are circumferentially arrayed centered on the axis of the boss (32).

6. The method according to claim 1, characterized in that: Lifting ring screw holes (6) are provided on the side surfaces of both the alignment template (3) and the fastening ring plate (4).

7. The method according to claim 1, characterized in that: Lifting screw holes (37) are provided on the alignment template (3).

8. The method according to claim 1, wherein: An installation hole (122) is formed at the end face of the large cylindrical section (12), and the axis of the installation hole (122) is collinear with the axis of the transition piece (1).

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