Bending device for fuel injection pipe of aero-engine and using method of bending device

Abstract

The invention discloses a bending device for an aero-engine fuel injection pipe and a using method thereof, and belongs to the technical field of aero-engines. L-shaped working grooves are formed in the two adjacent side walls of the base, the corners are hinged to the wheel seats, and a pressing plate is arranged at one end of each L-shaped working groove and connected with the base. The lower end of the rolling wheel is connected with the guide plate in an abutting mode, and the guide plate is connected with the wheel seat in an interference inserting mode and matched with the corner of the L-shaped working groove. The method comprises the following steps that a workpiece is placed in the L-shaped working groove; one end of the workpiece is pre-pressed through a pressing plate; the first nut is rotated to press the pressing plate, and then one end of the workpiece is pressed; the guide plate is inserted into the wheel seat; the wheel seat is rotated, the guide plate is driven through the roller, and the workpiece is bent through the guide plate. Performance defects of a welding part are avoided, the overall mechanical strength of a pipeline is improved, the stability of injection pressure and flow under the working condition of high-pressure lubricating oil is guaranteed, sufficient lubrication of moving parts such as a gearbox is guaranteed, and the service life of a cartridge receiver assembly is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of aviation engine oil injection pipe bending device and its using method, belong to aviation engine technical field. BACKGROUND

[0002] In the accessory casing assembly of aero-engine, to meet the high-pressure lubricating oil lubrication requirement of gear box meshing part, oil injection pipe system with specific flow channel structure needs to be configured. Since a large number of precision components are integrated inside the accessory casing, to avoid the space interference between the pipe system and other component assemblies, the oil injection pipe usually needs to be bent and formed.

[0003] In the prior art, the oil injection pipe is usually welded to realize multi-angle space configuration, and its manufacturing process usually includes one or more welding connections. The mechanical strength of the welding part is significantly lower than that of the integrally formed pipe, and stress concentration is easy to occur under high-pressure lubricating oil condition. Secondly, microscopic crack propagation phenomenon is easy to occur at the welding interface, which leads to the decrease of lubricating oil injection pressure and flow stability. Finally, the lubrication of moving parts such as gear box is insufficient, which significantly shortens the service life of the casing assembly. SUMMARY

[0004] To solve the problems in the background art, the present application provides an aviation engine oil injection pipe bending device and its using method.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: an aviation engine oil injection pipe bending device, comprising a wheel seat, a roller, a nut one, a base, a stud, a guide plate and a pressing plate; the base is a rectangular body structure, and adjacent two side walls of the base are provided with L-shaped working grooves, the corner part of the base corresponding to the turning angle of the L-shaped working groove is hinged with the opening end of the n-shaped wheel seat, one end of the L-shaped working groove is provided with a pressing plate, and the pressing plate and the side wall of the base are detachably fixedly connected through the stud and the nut one; the inside of the wheel seat is rotationally connected with the roller, the lower end of the roller is abuttingly connected with the guide plate, and the guide plate is interference-fitted with the wheel seat and is arranged in cooperation with the turning angle of the L-shaped working groove.

[0006] Further, the outer end of the wheel seat is threadedly fixed with a handle one.

[0007] Further, the outer wall of the nut one is fixed with a handle two.

[0008] Further, the lower end of the stud is connected with the base through a cylindrical pin.

[0009] Further, the side wall of the base is provided with a sunken platform, and the sunken platform is located at the end of the L-shaped working groove and is arranged in cooperation with the supporting surface of the pressing plate.

[0010] Further, the guide plate is provided with a working groove in the middle of the workpiece contact surface.

[0011] The application discloses a method for using a bending device for an aircraft engine oil injection pipe. S1: placing a workpiece in an L-shaped working groove; S2: pre-pressing one end of the workpiece by a pressing plate; S3: rotating a nut to press the pressing plate and then press one end of the workpiece; S4: inserting a guide plate into a wheel seat; S5: rotating the wheel seat to drive the guide plate through a roller, and bending the workpiece through the guide plate.

[0012] Compared with the prior art, the application has the beneficial effects that: The application replaces the welding connection mode with mechanical bending forming, avoids performance defects of the welding position, improves the overall mechanical strength of the pipeline, and eliminates stress concentration and crack propagation risks at the welding interface of the integral forming structure, thereby guaranteeing the stability of the injection pressure and flow under high-pressure lubricating oil working conditions, ensuring sufficient lubrication of the gear box and other moving parts, and effectively prolonging the service life of the engine case assembly. In addition, the lever principle is adopted for operation, the processing technology is simplified, the qualified rate of the workpiece in batch production is improved, the labor cost and manufacturing cost are reduced, and the production efficiency is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of the application; Figure 2 is a rear view of Figure 1 ; Figure 3 is a front view of Figure 1 ; Figure 4 is an A-A sectional view of Figure 3 ; Figure 5 is a B-B sectional view of Figure 3 ; Figure 6 is a structural schematic view of a wheel seat; Figure 7 is a sectional view of Figure 6 ; Figure 8 is a structural schematic view of a base; Figure 9 is a C-C sectional view of Figure 8 ; Figure 10 is a structural schematic view of a guide plate; Figure 11 is a side view of Figure 10 ; Figure 12 is a structural schematic view of a pressing plate; Figure 13 yes Figure 12 sectional view of Figure 14 yes Figure 13 DD cross-sectional view. DETAILED DESCRIPTION

[0014] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] A bending device for an aircraft engine fuel injection pipe includes a wheel seat 1, a roller 3, a nut 7, a base 8, a stud 10, a guide plate 11, and a pressure plate 12; the base 8 is a rectangular structure, and a mounting block is provided at the lower end of the base 8 for fixed connection to the workbench. An L-shaped working groove 15 is provided on the adjacent two side walls of the base 8. The radial dimension of the L-shaped working groove 15 is the same as the outer diameter of the workpiece, ensuring the fit of the workpiece during the bending process and preventing the workpiece from being bent due to an oversized design of the L-shaped working groove 15. The axial and radial dimensions of the L-shaped working groove 15 are also consistent with the dimensions of the workpiece after bending, preventing the workpiece from being unqualified in size after bending. The corners of the base 8 corresponding to the corners of the L-shaped working groove 15 are opened. 8 holes, hinged to the open end of the n-shaped wheel seat 1 through the corresponding spindle 4, the base 8 is An M10 threaded hole is located 55 mm from the center of the 8-hole, and a stud 10 is connected to the M10 threaded hole. A pressure plate 12 is installed at one end of the L-shaped working groove 15. The pressure plate 12 is removably fixed to the side wall of the base 8 via the stud 10, a nut 7, a spherical washer 13, and a conical washer 14. The dimensions of the pressure plate 12 are 98 mm × 26 mm × 28 mm, and a U-shaped groove is provided along its length to facilitate the passage of the stud 10. The pressure plate 12 has an R12 arc surface. Using this arc as a support surface increases the stability of the pressure plate 12. The contact between the arc surface and the base 8 is linear, avoiding the possibility of support failure due to poor flatness. The pressing end of the pressure plate 12 is also designed with a working groove. During initial contact with the workpiece, the workpiece moves along the working groove, making contact with the working groove of the pressure plate 12, thus firmly pressing the workpiece into the corresponding working groove of the base 8 through the pressure plate 12. The dimensions of the wheel seat 1 are 100mm×25mm×58mm, and a 30mm wide slot and two slots are provided in the height direction of the wheel seat 1. 8 through holes, the slot inside the wheel seat 1 is rotatably connected to the roller 3, specifically: the roller 3 is 25×30, inner hole is 8. Connect the roller 3 to the wheel seat 1 through the corresponding spindle 4, and tighten the nut 5 to the corresponding thread on the spindle 4. The spindle 4 is in the form of a step. The 13th shaft shoulder position fits with the end face of the wheel seat 1 to play a role in limiting. 8 outer diameter is used to pass through the corresponding roller 3 and wheel seat 1 The 8-hole position plays the role of connecting the roller 3 to the wheel seat 1. The small end of the spindle 4 is provided with an M6 thread, which is used in conjunction with the nut 2 5. The nut 2 5 is used to connect the spindle 4 through the end surface thread and fix it on the wheel seat 1. The through hole 8 is used to pass through two spindles 4, one of which connects the roller 3 to the groove of the wheel seat 1, and the other spindle 4 is used to connect the wheel seat 1 to the base 8. The lower end of the roller 3 is abutted against the guide plate 11, which is inserted into the wheel seat 1 with an interference fit and is arranged in conjunction with the corner of the L-shaped working groove 15.

[0016] The workpiece material is 1Cr18Ni9Ti, the length is 89mm, and the outer diameter is 6.5. Workpiece inner diameter 3. 3 Depth is 79.5mm. Injection nozzle aperture 0.8.

[0017] Furthermore, an M16 threaded hole is opened at the center of the outer end of the wheel seat 1, and an M16×35 screw is provided on the handle 2. The M16 threaded hole is screwed and fixed to the screw thread of the handle 2. The other end of the handle 2 is set as a spherical tapered handle. By gripping the spherical tapered handle, the wheel seat 1 is driven to rotate.

[0018] Furthermore, a handle 2 6 is detachably fixed to the outer wall of the nut 1 7 via a thread, so as to facilitate the rotation of the nut 1 7 .

[0019] Furthermore, the base 8 has a hole 12 mm away from the left end face. 5 holes are used to install cylindrical pins 9. The lower end of the stud 10 is connected to the base 8 through the cylindrical pin 9, which connects the stud 10 to the base 8 to prevent the stud 10 from rotating inside.

[0020] Furthermore, a recessed platform is provided on the side wall of the base 8, 9.5 mm from the left end face. The recessed platform is located at the end of the L-shaped working groove 15 and is aligned with the support surface of the pressure plate 12. The recessed platform is used to place the support surface of the pressure plate 12. The height direction is consistent with the thickness of the pressure plate support surface, preventing the support surface of the pressure plate 12 from protruding from the upper end face of the base 8, thus ensuring the regularity of the device.

[0021] Further, the outer size of the guide plate 11 is 50mm*30mm*15.8mm, and two side round corners are arranged in the width direction to prevent sharp edges from scratching the operator. The working groove is arranged in the middle of the contact surface of the guide plate 11 instead of a plane, and the working groove is in contact with one side of the workpiece and the L-shaped working groove 15 of the base 8 in the process of bending the workpiece, and the other side is in contact with the working groove of the guide plate 11, which plays a limiting role in the process of bending the workpiece, preventing the workpiece from separating from the working groove during the bending process, which causes the bending to fail.

[0022] The application further provides a use method of the aviation engine oil injection pipe bending device. S1: placing the workpiece in the L-shaped working groove 15; S2: pre-pressing one end of the workpiece through the pressing plate 12; S3: rotating the nut 7 to press the pressing plate 12, and then pressing one end of the workpiece; S4: inserting the guide plate 11 into the wheel seat 1 to ensure that the workpiece is located in the working groove of the guide plate 11; S5: rotating the wheel seat 1 to drive the guide plate 11 through the roller 3, and bending the workpiece through the guide plate 11.

[0023] It is obvious for those skilled in the art that the application is not limited to the details of the above-mentioned exemplary embodiments, and the application can be implemented in other forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0024] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bending device for an aircraft engine fuel injection pipe, characterized by: The invention comprises a wheel seat (1), a roller (3), a nut (7), a base (8), a stud (10), a guide plate (11) and a pressure plate (12); the base (8) is a rectangular structure, and adjacent two side walls of the base (8) are provided with L-shaped working grooves (15), and the corners of the base (8) corresponding to the corners of the L-shaped working grooves (15) are hinged to the open end of the n-shaped wheel seat (1), and one end of the L-shaped working groove (15) is provided with a pressure plate (12), and the pressure plate (12) is detachably fixedly connected to the side wall of the base (8) through the studs (10) and the nut (7); the interior of the wheel seat (1) is rotatably connected to the roller (3), and the lower end of the roller (3) is abutted against the guide plate (11), and the guide plate (11) is interference-fitted with the wheel seat (1) and is arranged in conjunction with the corner of the L-shaped working groove (15).

2. The bending device for an aircraft engine fuel injection pipe according to claim 1, characterized in that: The outer end of the wheel seat (1) is screwed and fixed to the thread of the handle (2).

3. The bending device for an aircraft engine fuel injection pipe according to claim 1, characterized in that: A handle 2 (6) is fixed to the outer wall of the nut 1 (7).

4. The bending device for an aircraft engine fuel injection pipe according to claim 1, characterized in that: The lower end of the stud (10) is plug-connected to the base (8) via a cylindrical pin (9).

5. The bending device for an aircraft engine fuel injection pipe according to claim 1, characterized in that: A sinking platform is provided on the side wall of the base (8), and the sinking platform is located at the end of the L-shaped working groove (15) and is matched with the supporting surface of the pressing plate (12).

6. The bending device for an aircraft engine fuel injection pipe according to claim 5, characterized in that: A working groove is provided in the middle of the contact surface between the guide plate (11) and the workpiece.

7. A method for using the bending device for an aircraft engine fuel injection pipe according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1: Place the workpiece in the L-shaped working groove (15); S2: pre-pressing one end of the workpiece through the pressing plate (12); S3: Turn nut 1 (7) to press the pressure plate (12), thereby pressing one end of the workpiece; S4: Insert the guide plate (11) into the wheel seat (1); S5: The wheel seat (1) is rotated to drive the guide plate (11) via the roller (3), and the workpiece is bent via the guide plate (11).

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