CN111482772B - Processing technology of combined fuel nozzle - Google Patents
Processing technology of combined fuel nozzle Download PDFInfo
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- CN111482772B CN111482772B CN202010319545.4A CN202010319545A CN111482772B CN 111482772 B CN111482772 B CN 111482772B CN 202010319545 A CN202010319545 A CN 202010319545A CN 111482772 B CN111482772 B CN 111482772B
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- fuel nozzle
- bending
- positioning
- combined
- cover plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
Abstract
The invention relates to the technical field of manufacturing of fuel nozzles of miniature turbojet engines, in particular to a processing technology of a combined fuel nozzle, which is used for solving the problems that the circumferential fastening angle of the combined fuel nozzle cannot be controlled, and each fuel nozzle unit is difficult to bend and easy to deform when the combined fuel nozzle is processed in the prior art. The fuel nozzle unit is formed in the assembling process, so that the circumferential fastening angle of the fuel nozzle unit can be controlled, the fuel nozzle unit can be more easily bent through the bending tool, and the bending angle alpha and the bending radius R can be well ensured; the problem that the length-diameter ratio of the fuel nozzle unit is large and easy to deform can be solved through the sizing tool, and therefore the fuel nozzle unit is not prone to deformation in the machining process.
Description
Technical Field
The invention relates to the technical field of manufacturing of a fuel nozzle of a micro turbojet engine, in particular to a machining process of a combined fuel nozzle.
Background
The combined fuel nozzle is a key part on a turbojet engine, and is required to uniformly inject fuel into a combustion chamber at a constant speed at a fixed angle so as to ensure stable combustion. The combined fuel nozzle comprises a fuel seat, a cover plate and a plurality of fuel nozzle units, a main oil way of the fuel nozzle is arranged on the fuel seat, an oil way of a closed space is formed by a U-shaped groove in the fuel seat and the cover plate, the plurality of fuel nozzle units are welded on the fuel seat, and the fuel nozzle units are fixed on the cover plate through threaded connection.
As shown in fig. 1, the fuel nozzle unit is a capillary tube with a tube diameter of phi 1, an acute angle alpha after bending, a bending radius R, a bending distance H and a nozzle height H. Too large a bending angle of the capillary tube may cause the tube to become flat or even break. In addition, the length-diameter ratio of the fuel nozzle unit structure is large, the fuel nozzle unit structure is poor in rigidity and easy to deform, and the assembly size phi 2 is not easy to control. In addition, the combined fuel nozzle is small in size and small in assembly space, adopts a simplified structure of threaded connection, is welded on the fuel seat and is connected with the cover plate through threads on the fuel seat. Because the circumferential fastening angle of the parts cannot be controlled by the threaded connection, the nozzles of the combined fuel nozzle cannot be ensured to be completely and accurately pointed to the circle center when the combined fuel nozzle is screwed down.
In summary, when the combined fuel nozzle is machined by using the machining process in the prior art, the circumferential fastening angle of the combined fuel nozzle cannot be controlled, and each fuel nozzle unit is difficult to bend and easy to deform. Therefore, there is a need for a combined fuel nozzle manufacturing process that can solve the above-mentioned technical problems.
Disclosure of Invention
Based on the problems, the invention provides a processing technology of a combined fuel nozzle, which is used for solving the problems that the circumferential fastening angle of the combined fuel nozzle cannot be controlled, and each fuel nozzle unit is difficult to bend and easy to deform when the combined fuel nozzle is processed in the prior art.
The invention specifically adopts the following technical scheme for realizing the purpose:
a processing technology of a combined fuel nozzle comprises the following steps:
s1 blanking: calculating the unfolding length according to the size of the fuel nozzle unit, and reserving a linear cutting allowance;
s2 wire cutting: cutting the length of the fuel nozzle unit;
s3 flame brazing: welding the fuel nozzle unit and the fuel seat into a fuel nozzle assembly through flame brazing;
s4 expedite check: checking the smoothness of the fuel nozzle assembly;
s5 straightening: straightening the fuel nozzle assembly to eliminate deformation caused by welding;
s6 assembling: assembling the fuel nozzle assemblies on the cover plate one by using a special wrench, scribing and recording the relative positions of the fuel seat and the cover plate after the fuel nozzle assemblies are assembled tightly, and recording the serial numbers of the marking pens on the cover plate;
s7 bending pipe: bending the fuel nozzle assembly by using a bending tool to ensure a bending angle alpha and a bending radius R;
s8 detaching: the fuel nozzle assembly is detached from the cover plate and is arranged in a part bag with a serial number, and the serial number of the part bag needs to correspond to the serial number on the cover plate one by one;
s9 wire cutting: cutting off the redundant reserved length at the elbow of the fuel nozzle assembly to ensure the bending distance h;
s10 assembling: installing the fuel nozzle assembly back to the corresponding position of the cover plate according to the number, and screwing the fuel nozzle assembly to the position recorded by the scribed line in the S6 assembling step by using a special wrench;
s11 sizing: and (3) performing a shape correction test before formal shape correction, rotating the adjusting and positioning shaft to control the axial position of the shape correction tool to press the fuel nozzle outwards, and stopping rotating after the assembling size phi 2 can be ensured.
As a preferred mode, the bending tool comprises a central shaft, a positioning cylinder is mounted in the middle of the central shaft, a moulding bed is mounted on the outer peripheral surface of the positioning cylinder, a bending edge is arranged on the moulding bed, and a screwing mechanism is mounted on the top surface, located on the positioning cylinder, of the central shaft.
As a preferred mode, the forming die comprises a placenta and a plurality of bending blocks, the placenta and the bending blocks are integrally formed, the bending edges are arranged on the bending blocks, and the bending blocks are uniformly arranged on the outer peripheral surface of the placenta and correspond to the fuel nozzle assemblies one by one.
Preferably, the positioning cylinder comprises an upper fixed cylinder and a lower connecting cylinder which are integrally molded from top to bottom, the tightening mechanism is mounted on the top surface of the upper fixed cylinder, and the molding bed is mounted on the outer circumferential surface of the lower connecting cylinder.
As a preferable mode, the screwing mechanism includes a washer installed on the central shaft and located on the top surface of the positioning cylinder, and a lock nut located on the top surface of the washer is further installed on the central shaft.
As a preferred mode, the correction tool comprises a positioning shaft and a tool sleeve, the positioning shaft penetrates through the tool sleeve and is in threaded connection with the tool sleeve, the axis of the positioning shaft is collinear with the axis of the tool sleeve, and a plurality of uniformly distributed grooves which correspond to the fuel nozzle assemblies one to one are formed in the lower portion of the tool sleeve.
As a preferred mode, the tooling sleeve comprises a cylinder body and a shape correcting disc which are formed into a whole from top to bottom, a plurality of uniformly distributed grooves are uniformly formed in the outer peripheral surface of the shape correcting disc, a threaded hole is formed in the top of the cylinder body, and the positioning shaft penetrates through the threaded hole and is in threaded connection with the threaded hole.
As a preferred mode, the positioning shaft comprises a positioning section, a positioning disc and a fixing section which are formed into a whole from top to bottom, the fixing section is connected with the fuel oil seat, the positioning disc is in contact with the inner wall of the tooling sleeve, and the positioning section penetrates through the threaded hole.
The invention has the following beneficial effects:
(1) the fuel nozzle unit is formed in the assembling process, so that the circumferential fastening angle of the fuel nozzle unit can be controlled, the fuel nozzle unit can be more easily bent through the bending tool, and the bending angle alpha and the bending radius R can be well ensured; the problem that the length-diameter ratio of the fuel nozzle unit is large and easy to deform can be solved through the sizing tool.
(2) According to the invention, through reasonable process flow design, machining design and forming tool design, a product meeting the drawing size requirement is finally realized more easily.
(3) The bending tool, the sizing tool and the combined fuel nozzle are convenient to mount and dismount, and are convenient and fast to use.
Drawings
FIG. 1 is a schematic front cross-sectional view of a fuel injector assembly of the present invention;
FIG. 2 is a simplified front cross-sectional view of the modular fuel injector of the present invention installed in a bending tool;
FIG. 3 is a simplified front cross-sectional view of the modular fuel injector of the present invention as installed in a calibration fixture;
FIG. 4 is a schematic perspective view of a tire mold of the present invention;
FIG. 5 is a schematic front sectional view of a positioning cartridge of the present invention;
FIG. 6 is a schematic perspective view of a tooling sleeve according to the present invention;
FIG. 7 is a schematic front view of a positioning shaft according to the present invention;
reference numerals: 1 fuel seat, 2 fuel nozzle units, 3 apron, 4 fuel nozzle subassembly, 5 center pins, 6 child moulds, 61 placenta, 62 piece of bending, 621 the limit of bending, 7 a location section of thick bamboo, 71 connecting cylinder down, fixed cylinder on 72, 8 packing rings, 9 lock nut, 10 frock sleeves, 101 school shape dish, 1011 equipartition groove, 102 barrel, 1021 screw hole, 11 location axle, 111 canned paragraph, 112 positioning disk, 113 positioning segment.
Detailed Description
For a better understanding of the present invention by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and the following examples.
Example (b):
as shown in fig. 1-3, a process for manufacturing a combined fuel nozzle comprises the following steps:
s1 blanking: calculating the unfolding length according to the size of the fuel nozzle unit 2, and reserving the wire cutting allowance;
s2 wire cutting: cutting the length of the fuel nozzle unit 2;
s3 flame brazing: welding the fuel nozzle unit 2 and the fuel seat 1 into a fuel nozzle assembly 4 through flame brazing;
s4 expedite check: checking the fuel nozzle assembly 4 for clearance;
s5 straightening: straightening the fuel nozzle assembly 4 to eliminate deformation caused by welding;
s6 assembling: assembling the fuel nozzle assemblies 4 on the cover plate 3 one by using a special wrench, after the assembly is tight, scribing and recording the relative positions of the fuel seat 1 and the cover plate 3, and numbering and recording the fuel nozzle assemblies on the cover plate 3 by using a marking pen;
s7 bending pipe: bending the fuel nozzle assembly 4 by using a bending tool to ensure the bending angle alpha and the bending radius R;
s8 detaching: the fuel nozzle assembly 4 is detached from the cover plate 3 and is arranged into a part bag with a serial number, and the serial number of the part bag is required to be in one-to-one correspondence with the serial number on the cover plate 3;
s9 wire cutting: cutting off the redundant reserved length at the elbow of the fuel nozzle assembly 4 to ensure the bending distance h;
s10 assembling: the fuel nozzle assembly 4 is installed back to the corresponding position of the cover plate 3 according to the number, and a special spanner is used for screwing to the position recorded by the marking line in the S6 assembling step;
s11 sizing: and (3) performing a shape correction test before formal shape correction, rotating the adjusting and positioning shaft 11 to control the axial position of the shape correction tool to press the fuel nozzle outwards, and stopping rotating after the assembling size phi 2 can be ensured.
As shown in fig. 2, 4 and 5, for convenience of understanding, a preferred bending tool is provided below, the bending tool comprises a central shaft 5, a positioning cylinder 7 is mounted in the middle of the central shaft 5, a molding bed 6 is mounted on the outer circumferential surface of the positioning cylinder 7, a bending edge 621 is arranged on the molding bed 6, and a screwing mechanism is mounted on the top surface of the positioning cylinder 7 on the central shaft 5.
The forming die 6 comprises a placenta 61 and a plurality of bending blocks 62 which are integrally formed, the bending edges 621 are arranged on the bending blocks 62, and the bending blocks 62 are uniformly arranged on the outer peripheral surface of the placenta 61 and correspond to the fuel nozzle assemblies 4 one by one. The positioning cylinder 7 comprises an upper fixing cylinder 72 and a lower connecting cylinder 71 which are integrally molded from top to bottom, the screwing mechanism is mounted on the top surface of the upper fixing cylinder 72, and the molding bed 6 is mounted on the outer peripheral surface of the lower connecting cylinder 71. The screwing mechanism comprises a washer 8 which is arranged on the central shaft 5 and is positioned on the top surface of the positioning cylinder 7, and a locking nut 9 which is positioned on the top surface of the washer 8 is also arranged on the central shaft 5.
When the bending tool is used, the central shaft 5 penetrates through the shaft inner hole of the fuel oil seat 1, the positioning cylinder 7 on the moulding bed 6 is positioned through the outer circle of the central shaft 5 and assembled with the central shaft 5, and then the moulding bed 6 is arranged in the positioning ring. And simulating the process of forming the fuel nozzle unit 2 by simulation analysis software, calculating the bending resilience, finally obtaining the optimal mould surface bent to the designed size, and processing and manufacturing the moulding bed 6. The bending blocks 62 are distributed on the circumference of the moulding bed 6 in a centripetal uniform manner, so that centripetal consistency of the fuel nozzle unit 2 during bending can be ensured. The plane of the moulding bed 6 and the plane of the fuel seat 1 are kept parallel through the central shaft 5, and the consistency of the height of the fuel nozzle unit 2 is guaranteed. One end of the fuel nozzle assembly 4 is welded and fixed on the cover plate 3 in advance, the other end is a free end, and the free end deforms along the bending edge of the forming die 6 during bending, so that the position of the bending starting point of each fuel nozzle unit 2 is ensured to be consistent with the bending angle.
As shown in fig. 3, 6 and 7, a preferred calibration fixture structure is provided below, the calibration fixture includes a positioning shaft 11 and a fixture sleeve 10, the positioning shaft 11 passes through the fixture sleeve 10 and is connected with the fixture sleeve 10 through a thread, an axis of the positioning shaft 11 is collinear with an axis of the fixture sleeve 10, and a plurality of uniformly distributed slots 1011 are formed in the lower portion of the fixture sleeve 10 and can be in one-to-one correspondence with the fuel nozzle assemblies 4. The tooling sleeve 10 comprises a cylinder 102 and a shape correction disc 101 which are mutually formed into a whole from top to bottom, a plurality of uniformly distributed grooves 1011 are uniformly formed on the outer peripheral surface of the shape correction disc 101, the top of the cylinder 102 is provided with a threaded hole 1021, and the positioning shaft 11 penetrates through the threaded hole 1021 and is in threaded connection with the threaded hole 1021. The positioning shaft 11 comprises a positioning section 113, a positioning disc 112 and a fixing section 111 which are formed into a whole from top to bottom, the fixing section 111 is connected with the fuel oil seat 1, the positioning disc 112 is in contact with the inner wall of the tooling sleeve 10, and the positioning section 113 penetrates through a threaded hole 1021.
The frock sleeve 10 of school type frock is fixed a position through location axle 11, frock sleeve 10 radially opens to have with fuel nozzle assembly 4 quantity unanimity, the equipartition groove 1011 that the cone angle corresponds, upright section card of fuel nozzle assembly 4 is gone into in the equipartition groove 1011, frock sleeve 10's diameter is greater than the diameter of fuel nozzle unit 2 equipartition circle, through rotational positioning axle 11, because pass through threaded connection between location axle 11 and barrel 102, so when rotational positioning axle 11, frock sleeve 10 can upwards or move downwards in vertical direction, thereby force fuel nozzle unit 2 to incline.
The fuel nozzle unit 2 is obliquely bent, the bending angle is obtained by calculating the springback amount through simulation analysis, the angle of the uniformly distributed grooves 1011 is the angle before the fuel nozzle unit 2 is bent and rebounds, and meanwhile, the stroke of the uniformly distributed grooves 1011 along the axis is calculated according to the bending angle. When the fuel nozzle unit 2 is bent, the fuel nozzle unit 2 is in line contact with the lower end of the uniformly distributed groove 1011 to start bending, so that the inclination angle of the fuel nozzle unit 2 is controlled, the inclination angle of the fuel nozzle unit 2 is matched with the size of the uniformly distributed groove 1011 after the fuel nozzle unit is bent in place, the tool is placed statically to release stress, and the fuel nozzle unit 2 rebounds to the designed angle after the tool is taken down.
The combined fuel nozzle can be processed through the operation, and the forming in the assembling process can control the circumferential fastening angle of the fuel nozzle unit 2, so that the fuel nozzle unit 2 can be more easily bent through the bending tool, and the bending angle alpha and the bending radius R can be well ensured; the problem that the length-diameter ratio of the fuel nozzle unit 2 is large and easy to deform can be solved through the sizing tool.
The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly illustrating the verification process of the invention and are not intended to limit the scope of the invention, which is defined by the claims, and all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A processing technology of a combined fuel nozzle is characterized in that: the method comprises the following steps:
s1 blanking: calculating the unfolding length according to the size of the fuel nozzle unit (2), and reserving the wire cutting allowance;
s2 wire cutting: cutting the length of the fuel nozzle unit (2);
s3 flame brazing: welding the fuel nozzle unit (2) and the fuel seat (1) into a fuel nozzle assembly (4) through flame brazing;
s4 expedite check: checking the fuel nozzle assembly (4) for clearance;
s5 straightening: straightening the fuel nozzle assembly (4) to eliminate deformation caused by welding;
s6 assembling: assembling the fuel nozzle assemblies (4) on the cover plate (3) one by using a special wrench, scribing and recording the relative positions of the fuel base (1) and the cover plate (3) after the fuel nozzle assemblies are assembled tightly, and numbering and recording the fuel nozzle assemblies on the cover plate (3) by using marking pens;
s7 bending pipe: bending the fuel nozzle assembly (4) by using a bending tool to ensure a bending angle alpha and a bending radius R;
s8 detaching: the fuel nozzle assembly (4) is detached from the cover plate (3) and is loaded into a part bag with a serial number, and the serial number of the part bag needs to correspond to the serial number on the cover plate (3) one by one;
s9 wire cutting: cutting off the redundant reserved length at the elbow of the fuel nozzle assembly (4) to ensure the bending distance h;
s10 assembling: the fuel nozzle assembly (4) is installed back to the corresponding position of the cover plate (3) according to the number, and a special wrench is used for screwing to the position recorded by the scribed line in the S6 assembling step;
s11 sizing: and (3) performing a shape correction test before formal shape correction, rotating the adjusting positioning shaft (11) to control the axial position of the shape correction tool to press the fuel nozzle outwards, and stopping rotating after the assembling size phi 2 can be ensured.
2. The machining process of the combined fuel nozzle according to claim 1, characterized in that: the bending tool comprises a center shaft (5), a positioning barrel (7) is mounted in the middle of the center shaft (5), a forming die (6) is mounted on the outer peripheral surface of the positioning barrel (7), a bending edge (621) is arranged on the forming die (6), and a screwing mechanism is mounted on the top surface of the positioning barrel (7) on the center shaft (5).
3. The machining process of the combined fuel nozzle according to claim 2, characterized in that: the forming die (6) comprises a placenta (61) and a plurality of bending blocks (62) which are formed into a whole, wherein the bending edges (621) are arranged on the bending blocks (62), and the bending blocks (62) are uniformly arranged on the outer peripheral surface of the placenta (61) and correspond to the fuel nozzle assemblies (4) one by one.
4. The machining process of the combined fuel nozzle according to claim 2, characterized in that: the positioning cylinder (7) comprises an upper fixing cylinder (72) and a lower connecting cylinder (71) which are formed into a whole from top to bottom, the screwing mechanism is installed on the top surface of the upper fixing cylinder (72), and the tire mold (6) is installed on the outer peripheral surface of the lower connecting cylinder (71).
5. The process for manufacturing a combined fuel nozzle according to any one of claims 2 to 4, wherein: the screwing mechanism comprises a gasket (8) which is arranged on a central shaft (5) and positioned on the top surface of the positioning cylinder (7), and a locking nut (9) which is positioned on the top surface of the gasket (8) is also arranged on the central shaft (5).
6. The machining process of the combined fuel nozzle according to claim 1, characterized in that: the school type frock includes location axle (11) and frock sleeve (10), location axle (11) pass frock sleeve (10) and pass through threaded connection with frock sleeve (10), and the axis of location axle (11) and the axis collineation of frock sleeve (10), the lower part of frock sleeve (10) is opened has a plurality of can with fuel nozzle assembly (4) one-to-one evenly distribute groove (1011).
7. The machining process of the combined fuel nozzle according to claim 6, wherein the machining process comprises the following steps: the tool sleeve (10) comprises a cylinder body (102) and a shape correcting disc (101) which are formed into a whole from top to bottom, a plurality of uniformly-distributed grooves (1011) are uniformly formed in the outer peripheral surface of the shape correcting disc (101), a threaded hole (1021) is formed in the top of the cylinder body (102), and the positioning shaft (11) penetrates through the threaded hole (1021) and is in threaded connection with the threaded hole (1021).
8. The machining process of the combined fuel nozzle according to claim 7, characterized in that: the positioning shaft (11) comprises a positioning section (113), a positioning disc (112) and a fixing section (111) which are formed into a whole from top to bottom, the fixing section (111) is connected with the fuel oil seat (1), the positioning disc (112) is in contact with the inner wall of the tooling sleeve (10), and the positioning section (113) penetrates through a threaded hole (1021).
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| CN202010319545.4A CN111482772B (en) | 2020-04-21 | 2020-04-21 | Processing technology of combined fuel nozzle |
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| CN202010319545.4A CN111482772B (en) | 2020-04-21 | 2020-04-21 | Processing technology of combined fuel nozzle |
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| CN111482772B true CN111482772B (en) | 2021-04-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111906503B (en) * | 2020-08-12 | 2022-02-11 | 南京国祺新能源设备有限公司 | Preparation process of side wall type nozzle |
| CN113523735B (en) * | 2021-09-01 | 2022-07-22 | 西安远航真空钎焊技术有限公司 | Preparation method of injector |
| CN115745640B (en) * | 2022-11-02 | 2023-09-01 | 西安鑫垚陶瓷复合材料股份有限公司 | Forming process of ceramic matrix composite slender thin-wall pipe |
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