Fuel nozzle machining and performance debugging method

Abstract

The invention discloses a fuel nozzle machining and performance debugging method. The fuel nozzle machining and performance debugging method comprises the following steps that S1, an auxiliary oil way nozzle and a swirler are machined and optimized; s2, nozzle rod and assembly machining process optimization; s3, performing matching analysis on the flow of the fuel nozzle; s4, after the part is welded, a torque wrench is used for tightening, the tightening torque is gradually adjusted, and the reliability of the torque is verified through a test; by means of the method, the machining quality and stability of the auxiliary oil way swirler are effectively improved; and the influence of welding thermal deformation is reduced, the stability of the flow of the main oil way is improved, and the qualified rate of products is also greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel nozzle processing and testing, and in particular, relates to a fuel nozzle processing and performance debugging method. Background Art

[0002] Type I fuel nozzle is a new generation of welded complex dual oil circuit fuel nozzle, which is composed of multiple single parts such as nozzle rod, auxiliary oil circuit nozzle, auxiliary oil circuit swirler, screw plug, plug cover, filter screen, etc. Different from other dual oil circuit fuel nozzles with independent main nozzle, this fuel nozzle integrates the main nozzle into the nozzle rod, and the integrity of the nozzle is better, but the processing parts of a single part are more, and the corresponding processing difficulty and performance debugging difficulty are also greater.

[0003] The processing difficulties of the fuel nozzle are mainly reflected in the following aspects:

[0004] Difficult processing: A large number of micro-cutters are used in the processing process. Affected by the cutter and processing parameters, the precision dimension processing is unstable, which has a great impact on the performance of the fuel nozzle. Secondly, the main nozzle is concentrated in the nozzle rod. Affected by the clamping method, the cutter is seriously cut during processing, and the dimensional accuracy and surface quality requirements are high, which places high requirements on the cutter, resulting in great processing difficulty.

[0005] Difficult performance debugging: The flow rate of the auxiliary oil circuit is unstable. The flow rate of the auxiliary oil circuit is jointly controlled by the auxiliary oil circuit nozzle and the auxiliary oil circuit swirler. Since the cooperation between the auxiliary oil circuit nozzle and the swirler is a clearance cooperation, some fuel will flow out from the gap, resulting in unstable overall flow rate; secondly, the flow rate of the auxiliary oil circuit is relatively large. Affected by the precision dimensional processing stability of the auxiliary oil circuit nozzle and the main nozzle assembly, the flow rate of the main oil circuit is difficult to control within the qualified range. At the same time, the flow rate of the main oil circuit is significantly affected by welding heat.

[0006] The patent with the prior art patent publication number CN110421316A discloses a new process research method for fuel nozzle processing. By improving the processing method of the fuel nozzle, the heat-affected zone around the hole can be eliminated, and the processing can effectively remove the specified material, and the remaining processing interface is a surface that is not damaged by heat, which greatly improves the surface performance of the hole wall, and at the same time improves the accuracy and precision. The finish of the hole is extremely high, and its roughness can reach Ra≤0.1μm, so excellent performance can be obtained, and the consistency of the hole is good. The roundness, cylindricity, taper and roughness of these complete and clean holes are highly consistent. In this patent, each part needs to be roughed, semi-finished, and finished to ensure the dimensional accuracy, and the patent emphasizes that the rough and fine processing of the same batch of parts needs to be separated by a period of time. Therefore, in this process, the parts need to be clamped repeatedly for many times, and the secondary clamping error will affect the processing accuracy of the same batch of parts, which makes it difficult to ensure the consistency of the nozzle performance. Furthermore, the nozzle is a single-oil-circuit combined centrifugal nozzle, which has a relatively simple structure and a performance matching complexity that is not as high as that of a welded dual-oil-circuit centrifugal nozzle. Summary of the invention

[0007] The present invention mainly aims at the problem that in the prior art, the main nozzle of the fuel nozzle is integrated into the nozzle rod, the integrity of the nozzle is better, but the processing parts of a single part are more, the corresponding processing difficulty and performance debugging difficulty are also greater, and the qualified rate of the processed parts is low. A fuel nozzle processing and performance debugging method is provided.

[0008] In view of the above technical problems, the technical solutions of the present invention are as follows:

[0009] A fuel nozzle processing and performance debugging method comprises the following steps:

[0010] S1. Optimization of auxiliary oil circuit nozzle and cyclone processing: according to the geometric shape of the parts, try to use inner hole turning tool, profile buried drill and profile grinding head to finish the auxiliary oil circuit nozzle; Optimization of auxiliary oil circuit nozzle and cyclone processing: according to the geometric shape of the parts, try to use inner hole turning tool, profile buried drill and profile grinding head to finish the auxiliary oil circuit nozzle; optimize the processing parameters of the micro milling cutter for processing the cyclone groove, and remove the burrs on the cyclone groove;

[0011] S2. Optimization of nozzle rod and component processing: adding process holes and converting the blank reference to the process holes;

[0012] S2.1. Based on the structural characteristics of the nozzle rod, an auxiliary support structure and a double top structure are added to the fixture;

[0013] S2.2. Use a CNC machine and a vertical machining center to process the nozzle rod assembly respectively. According to the inner cavity structure and processing requirements of the main nozzle, use a cone milling cutter to rough-process and finish-process the 74° cone surface of the nozzle rod assembly, and use a forming reamer to finish-process the 110° inner cone and φ7.8 inner hole of the nozzle rod assembly.

[0014] S3. Analyze the flow matching of the fuel nozzle. Before the flow test, measure and number the key dimensions of the nozzle rod assembly, the auxiliary oil circuit nozzle and the auxiliary oil circuit swirler. Then select and carry out flow test in sequence. Select the auxiliary oil circuit nozzle or auxiliary oil circuit swirler according to the flow test results.

[0015] S4. After the parts are welded, use a torque wrench to tighten them and gradually adjust the tightening torque to verify the reliability of the torque through tests.

[0016] Furthermore, in the step S1, a profile buried drill is selected as a finishing tool.

[0017] Furthermore, the cutting edge of the profile drill is a single-edged one, and the rotation speed is 12000r / min and the feed is F10.

[0018] Furthermore, in step S1.1, the tool monitoring system is used to optimize the micro-milling cutter processing parameters, sensors are installed on the A-axis and C-axis of the machine tool, and then the data is collected in real time through the data acquisition system to determine whether there is any abnormality in the tool.

[0019] Furthermore, the sensor is a resonant acoustic emission sensor, and the micro-milling cutter processing parameters are a rotation speed of 25000 r / min, a feed of 10 mm / min, and a cutting depth of 0.1 mm.

[0020] Furthermore, in the step S1.1, in the process of removing the burrs of the swirl groove, the outer circle of the swirl groove is firstly fine-machined to remove the burrs on the surface, and then a chamfering cutter is used for processing, and the processing path of the chamfering cutter is consistent with the processing path of the micro-milling cutter.

[0021] Furthermore, in the step S2.1, the auxiliary support structure is arranged at the bottom of the main nozzle, and the double-top structure is arranged at the middle rod position of the nozzle.

[0022] Furthermore, in the step S2.2, during the processing of the lathe nozzle rod assembly, a counterweight is added to the main nozzle side of the lathe fixture so that after the parts are installed, the center of gravity of the lathe fixture is located on the rotation center.

[0023] Furthermore, in step S2.2, a φ8.5 cone milling cutter is used to rough-machine the 74° cone surface, and then a φ10 cone milling cutter is used to fine-machine the 74° cone surface; a φ7.8 forming reamer is used to fine-machine the 110° inner cone and the φ7.8 inner hole.

[0024] Furthermore, in step S3, the matching clearance between the nozzle rod assembly and the auxiliary oil circuit nozzle is 0.010-0.015 mm, and the matching clearance between the auxiliary oil circuit nozzle and the cyclone is 0.011 mm-0.016 mm.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention has tried the inner hole turning tool, forming grinding head and forming buried drilling for the auxiliary oil circuit nozzle. After comparative analysis, the inner cone surface quality is the best and most stable when the contour buried drilling is used, and the optimal parameters of the forming buried drilling are determined to be a speed of 12000r / min and a feed of F10. For the auxiliary oil circuit cyclone, the tool monitoring system is used to optimize the processing parameters of the φ0.3 micro milling cutter, and the optimal parameters of the φ0.3 milling cutter are determined to be a speed of 25000r / min, a feed of 10mm / min, and a cutting depth of 0.1mm, which effectively improves the processing quality and stability of the auxiliary oil circuit cyclone.

[0027] 2. The present invention reduces repeated clamping errors and improves the size processing qualification rate by optimizing the processing technology of the nozzle rod and components, improving the reference conversion process, and adding process positioning holes for reference conversion. Based on the structural characteristics of the nozzle rod, the present invention optimizes the fixture, improves the clamping scheme, and adds auxiliary support structures and double top structures to eliminate the problem of position deviation of parts during processing.

[0028] 3. During the fuel nozzle debugging process, the matching relationship between the nozzle rod assembly, the auxiliary oil circuit nozzle, and the swirler was obtained through the matching process, which reduced the number of repair and debugging, and the qualified flow rate of the fuel nozzle was increased from 0 to 58.8% in one assembly. The assembly process of the torque wrench was adopted to increase the tightening torque, effectively reduce the influence of welding thermal deformation, and improve the stability of the main oil circuit flow rate. After a series of process improvements, the qualified rate increased by more than 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the processing and performance debugging method of the fuel nozzle rod of the present invention;

[0030] Figure 2 A flow chart of the matching analysis of the fuel nozzle flow rate of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of a welded dual-oil-path fuel nozzle of the present invention;

[0032] Figure 4 It is a monitoring signal diagram of the milling process of the auxiliary oil circuit cyclone of the present invention;

[0033] Figure 5It is a schematic diagram of the countersinking process of the nozzle rod 30 of the present invention;

[0034] Figure 6 This is a schematic diagram of the optimized fixture structure of the present invention;

[0035] Figure 7 It is a schematic cross-sectional view of the optimized clamp structure of the present invention;

[0036] Table 1 is a schematic diagram of the CNC vertical tooling for the nozzle rod of the present invention;

[0037] Table 2 is the test data after the optional combination of the present invention;

[0038] Table 3 is the fuel nozzle flow test data of the present invention;

[0039] In the above figure, 1. nozzle rod assembly; 2. auxiliary oil circuit nozzle; 3. auxiliary oil circuit cyclone; 4. mounting hole; 5. auxiliary support structure; 6. double top structure; 7. screw plug; 8. plug cover; L1: countersunk hole depth; L2: mounting edge height; φA: countersunk hole diameter. DETAILED DESCRIPTION

[0040] In order to clearly illustrate the technical features of the application scheme of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0042] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Example 1

[0045] like Figure 1 As shown, a fuel nozzle processing and performance debugging method includes the following steps:

[0046] S1, auxiliary oil circuit nozzle and cyclone processing optimization: according to the geometric shape of the parts, try to use the inner hole turning tool, the copying buried drill and the profile grinding head to finish the auxiliary oil circuit nozzle 2; optimize the processing parameters of the micro milling cutter for processing the cyclone groove, and remove the burrs on the cyclone groove;

[0047] S2. Optimization of nozzle rod and component processing: adding process holes and converting the blank reference to the process holes;

[0048] S2.1. Based on the structural characteristics of the nozzle rod, the fixture structure and clamping scheme are optimized by adding an auxiliary support structure 5 and a double top structure 6;

[0049] S2.2, respectively use a lathe and a vertical machining center for processing, and according to the inner cavity structure and processing requirements of the main nozzle, use a cone milling cutter to rough and finely process the 74° cone surface of the nozzle rod assembly 1, and use a forming reamer to finely process the 110° inner cone and φ7.8 inner hole of the nozzle rod assembly;

[0050] S3. Analyze the flow matching of the fuel nozzle. Before the flow test, measure and number the key dimensions of the nozzle rod assembly 1, the auxiliary oil circuit nozzle 2 and the auxiliary oil circuit cyclone 3. Then select and perform flow tests in sequence. Select the auxiliary oil circuit nozzle 2 or the auxiliary oil circuit cyclone 3 according to the flow test results.

[0051] S4. After the parts are welded, use a torque wrench to tighten them and gradually adjust the tightening torque to verify the reliability of the torque through tests.

[0052] In this embodiment, the processing technology of the auxiliary oil nozzle 2 is optimized: the main processing difficulty of the auxiliary oil nozzle 2 is the processing of the φ0.4 inner hole and the 60° inner cone, such as Figure 3 As shown in the figure, the machining accuracy and quality of this part directly affect the spray cone angle of the auxiliary oil circuit. In the finishing process, internal hole turning tools, forming grinding heads and profile drilling were tried respectively.

[0053] Among them, the inner hole turning tool is relatively slender, and the tool tip position is only about 0.2mm, which makes it difficult to align the tool and the tool tip is very easy to break. The tool rigidity is insufficient, and the inner cone has a large allowance, resulting in the inner hole tool being cut when processing to the 1 / 3 position of the cone surface. The forming grinding head fits the cone surface of the part completely. Due to the high viscosity of stainless steel, it heats up quickly, the grinding heat is large, and the coolant is difficult to enter. The grinding head is severely worn. The quality of the worn grinding head is inconsistent when grinding parts, and the finish is unstable. The cutting edge of the contoured buried drill is designed as a single-edged form. Compared with the traditional contoured buried drill, it is conducive to the coolant entering the cutting environment. By trying a variety of cutting parameters, the speed is 12000r / min, and the feed is F10. The surface quality of the cone surface has been greatly improved.

[0054] By comparing and analyzing the three processing methods, it is found that the surface quality of parts processed by contour drilling is the best and most stable.

[0055] like Figure 4 As shown, in this embodiment, the processing technology of the auxiliary oil circuit cyclone 3 is optimized: the cyclone groove is processed by a φ0.3 milling cutter. Since the milling cutter is relatively small, has poor rigidity, and the processing size is unstable, the processing parameters of the φ0.3 milling cutter are optimized using a tool monitoring system. The resonant acoustic emission sensor for monitoring the acoustic emission signal is installed on the A axis and C axis of the machine tool to monitor the acoustic emission signal during the milling process. The data acquisition system is then used to collect the acoustic emission signal in real time to determine whether there are abnormal conditions such as tool damage and tool breakage. The optimal parameters of the φ0.3 milling cutter are a speed of 25000r / min, a feed of 10mm / min, and a cutting depth of 0.1mm.

[0056] In this embodiment, the burrs on the surface of the swirl groove are removed manually and then removed by CNC, that is, by optimizing the program and using CNC to remove the burrs. After the swirl groove is processed, the outer circle of the swirl groove is firstly fine-machined with an external cylindrical cutter to remove the burrs on the surface, and then the chamfering cutter is used for processing. The processing path of the chamfering cutter is consistent with the processing path of the φ0.3 milling cutter, so as to remove the burrs on the edges of the swirl groove.

[0057] Example 2

[0058] like Figure 1 As shown, a method for processing and debugging the performance of a fuel nozzle is provided. In this embodiment, the reference conversion process is optimized: three Φ6.4 mounting holes 4 are processed on the nozzle mounting surface, and a 3mm machining allowance is left at the top of the mounting hole 4. When processing the M5 thread in the 30 step, a countersunk hole is processed above the thread, and the blank reference is converted to 3 countersunk holes. The upper part of the hole is used for angular positioning when processing the Φ6.4 mounting hole in the 90 step, and the lower part of the hole is processed with an M5 thread for tightening and fixing the mounting surface in the 50 step.

[0059] Since the dial gauge head used for alignment is 0.5mm in diameter, if L1 is too short, it will be inconvenient to align the inner hole in the 90-degree process. If the dial gauge head hits the hole mouth, it may also cause a large installation error. If L1 is longer, the thread length: L2-L1 becomes smaller, the number of thread threads becomes smaller, and there is a risk of deformation of the inner hole thread when the tension is large. Since the support surface has a 2mm machining allowance, and the screw and the threaded hole are guaranteed to have at least 4 to 5 threads to ensure that the parts will not loosen during clamping, the above factors are comprehensively considered, such as Figure 5 As shown, L2 can be 9mm, L1 can be 2mm, then the thread hole depth is 7mm, after removing the 2mm machining allowance, the thread depth is still 5mm and the number of threads is 6, which can ensure that the parts will not loosen during clamping and processing. In the 90 process, three ΦA holes can be directly found to achieve positioning and angular orientation, avoiding the need to find the blank reference again in the 90 process and realizing reference conversion.

[0060] Clamping process optimization: Figure 6 and Figure 7 As shown, an auxiliary support 5 is added to the bottom of the main nozzle to prevent the part from moving up and down when milling the end face, and a double top structure 6 is added to the middle rod position to increase the stability of the part, avoid left and right deviation when milling the outer circle, and eliminate vibration marks.

[0061] Optimization of machining process of nozzle rod assembly 1 (computer turning): The nozzle rod is a special-shaped structural part, and the main structure is concentrated on the installation edge. The center of gravity of the part is biased towards the installation edge. When the main nozzle is machined by computer turning, there will be a large centrifugal force after the part is rotated, and the rotation speed cannot be increased, which affects the machining accuracy. The computer turning fixture is optimized, and two counterweights are added to the main nozzle side of the fixture to ensure that the center of gravity of the entire fixture is located at the rotation center after the part is installed, eliminating the influence of centrifugal force. The use of multi-layer small feed cutting method can effectively ensure the machining quality of the cone surface and the smooth transition between the φ7.8 inner hole and the 110° cone, so as to achieve one-time machining of the entire inner oil channel.

[0062] Optimization of the machining process of nozzle rod assembly 1 (CNC vertical machining): The tool scheme for vertical machining of the nozzle rod is shown in Table 1. The 74° cone is the oil sealing surface. A φ8.5 cone milling cutter is used to rough-machine the 74° inner cone, leaving a 0.05mm margin for fine machining; a φ10 cone milling cutter is used to fine-machine the 74° inner cone, which can not only ensure the size of the inner cone, but also improve the surface quality. A φ7.8 forming reamer 110° is used to fine-machine the 110° inner cone and the φ7.8 inner hole at the same time, and the consistency of the inner hole is guaranteed. At the same time, the transition marks between the inner cone and the hole can be eliminated, and the influence of the transition marks on the flow of fuel can be eliminated.

[0063] Table 1

[0064]

[0065] Example 3

[0066] As shown in Table 2, in this embodiment, the inner hole size φ3.2 of the auxiliary oil circuit nozzle 2, the outer circle φ3.2 of the auxiliary oil circuit swirler 3, the inner hole φ7.8 of the nozzle rod assembly 1, and the outer circle size φ7.8 of the auxiliary oil circuit nozzle 2 are measured, and the parts are numbered and the measured values ​​are recorded.

[0067] Table 2

[0068] Nozzle No. Nozzle Lever Assembly Auxiliary oil nozzle Cyclone Main oil flow Auxiliary oil flow 1 5 3 1 1110.6 130.4 2 2 7 6 1119.5 131.3 3 4 4 7 1113.4 132.1 4 6 15 16 1125.6 133.3 5 12 10 14 1121.3 131.2 6 15 17 9 1131.2 129.4 7 1 9 5 1128.4 133.8 8 11 12 10 1132.8 127.5 9 9 16 11 1140.2 134.9 10 13 1 12 1135.3 127.6 11 16 2 4 1144.8 128.2 12 8 <![CDATA[ 5 ]]> 3 1141.6 131.3 13 14 8 17 1159.8 132.5 14 10 6 8 1154.3 131.6 15 3 11 13 1156.7 128.6 16 17 13 2 1163.7 127.3 17 7 14 15 1171.4 134.5

[0069] The required range of the main oil circuit flow rate is 1115.9~1161.5g / min. When the fitting clearance is 0.01mm, the main oil circuit flow rate is 1117.6g / min, which is slightly larger than the lower limit flow rate value. When the fitting clearance is 0.015mm, the main oil circuit flow rate is 1141.2g / min, which is slightly higher than the upper limit flow rate value. According to the development experience of fuel nozzles, the main oil circuit flow rate will be larger after welding. Therefore, according to the flow value, the fitting clearance of the nozzle rod 1 assembly and the auxiliary oil circuit nozzle 2 can be combined according to 0.010~0.015mm. In this example, the fitting clearance of 0.012mm is more appropriate.

[0070] The flow rate of the auxiliary oil circuit is in the range of 128.8 to 135.4 g / min. When the auxiliary oil circuit cyclone 3 is matched with the auxiliary oil circuit nozzle 2, the matching clearance is 0.007 mm, and the flow rate of the auxiliary oil circuit is 125.3 g / min, which is less than the design requirement. When the matching clearance increases to 0.010, the flow rate of the auxiliary oil circuit is 128.1, which is slightly less than the design value. Only a slight polishing of the cyclone is required to pass. When the matching clearance is 0.016, the flow rate of the auxiliary oil circuit is 134.5, which is slightly poor. Therefore, the matching clearance between the auxiliary oil circuit nozzle 2 and the auxiliary oil circuit cyclone 3 should be selected between 0.011 mm and 0.016 mm. In this example, the matching clearance of 0.012 mm is more appropriate.

[0071] As shown in Table 2, 10 fuel nozzles have qualified main and auxiliary oil circuits after selection, and the qualified rate of one-time equipment is 58.8%. This method can improve the qualified rate of one-time assembly flow test, and reduce the number of parts polishing and repair. During the polishing and repair, the polishing and repair value can be quantified, which reduces the dependence on manual skill level when debugging fuel nozzles.

[0072] After the nozzle parts are welded, they are tightened with a torque wrench and the tightening torque is gradually adjusted to verify the reliability of the torque through tests. As shown in Table 3;

[0073] Table 3

[0074]

[0075] When the torque force is 20N·m, comparing the flow test data before and after welding, the flow changes of the main oil circuit before and after welding are large and small, with the maximum change being 12.4g / min. After tightening with a torque wrench, the flow of the main oil circuit after welding is obviously stable.

[0076] Obviously, the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fuel nozzle processing and performance debugging method, characterized in that: The following steps are involved: S1. Optimization of auxiliary oil circuit nozzle and cyclone processing: according to the geometric shape of the parts, try to use internal hole turning tool, profile drilling and profile grinding head to finish the auxiliary oil circuit nozzle; optimize the processing parameters of the micro milling cutter for processing the cyclone groove, and remove the burrs on the cyclone groove; S2. Optimization of nozzle rod and component processing: adding process holes and converting the blank reference to the process holes; S2.

1. Based on the structural characteristics of the nozzle rod, an auxiliary support structure and a double top structure are added to the fixture; S2.

2. Use a CNC machine and a vertical machining center to process the nozzle rod assembly respectively. According to the inner cavity structure and processing requirements of the main nozzle, use a cone milling cutter to rough-process and finish-process the 74° cone surface of the nozzle rod assembly, and use a forming reamer to finish-process the 110° inner cone and φ7.8 inner hole of the nozzle rod assembly. S3. Analyze the flow matching of the fuel nozzle. Before the flow test, measure and number the key dimensions of the nozzle rod assembly, the auxiliary oil circuit nozzle and the auxiliary oil circuit swirler. Then select and carry out flow test in sequence. Select the auxiliary oil circuit nozzle or auxiliary oil circuit swirler according to the flow test results. S4. After the parts are welded, use a torque wrench to tighten them and gradually adjust the tightening torque to verify the reliability of the torque through tests.

2. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In the step S1, a profile buried drill is selected as a finishing tool.

3. A fuel nozzle processing and performance debugging method according to claim 2, characterized in that: The cutting edge of the profile drill is single-edged, with a rotation speed of 12000 r / min and a feed rate of F10.

4. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In step S1, the tool monitoring system is used to optimize the micro-milling cutter processing parameters, and sensors are installed on the A-axis and C-axis of the machine tool. The data acquisition system is then used to collect and monitor the acoustic emission signals of the milling process in real time to determine whether the tool has any abnormal conditions.

5. A fuel nozzle processing and performance debugging method according to claim 4, characterized in that: The sensor is a resonant acoustic emission sensor, and the micro-milling cutter processing parameters are a rotation speed of 25000 r / min, a feed of 10 mm / min, and a cutting depth of 0.1 mm.

6. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In the step S1, in the process of removing the burrs of the swirl groove, the outer circle of the swirl groove is firstly fine-machined to remove the burrs on the surface, and then a chamfering cutter is used for processing, and the processing path of the chamfering cutter is consistent with the processing path of the micro-milling cutter.

7. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In the step S2.1, the auxiliary support structure is arranged at the bottom of the main nozzle, and the double-top structure is arranged at the middle rod position of the nozzle.

8. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In the step S2.2, during the machining of the lathe nozzle rod assembly, a counterweight is added to the main nozzle side of the lathe fixture so that after the parts are installed, the center of gravity of the lathe fixture is located on the rotation center.

9. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In step S2.2, a φ8.5 taper milling cutter is used to rough-machine the 74° taper surface, and then a φ10 taper milling cutter is used to fine-machine the 74° taper surface; a φ7.8 forming reamer is used to fine-machine the 110° inner cone and the φ7.8 inner hole.

10. A fuel nozzle processing and performance debugging method according to claim 1, characterized in that: In the step S3, the matching clearance between the nozzle rod assembly and the auxiliary oil circuit nozzle is 0.010-0.015 mm, and the matching clearance between the auxiliary oil circuit nozzle and the cyclone is 0.011 mm-0.016 mm.

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