Aero-engine complex shell pressure flushing method

Abstract

The present application belongs to the field of aero-engine shell cleanliness control, and relates to an automatic pressure washing method for complex shells. The aero-engine complex shell pressure washing method is characterized in that, after the shell to be washed is clamped and positioned, the shell structure features are analyzed, the cleaning nozzle is determined according to different structure features, then the cleaning scheme is determined according to the cleaning nozzle and the structure features, and the cleaning path is planned. When the cleaning path is planned, the same nozzle is selected according to the structure features to be cleaned, the same type of structure features is cleaned in a top-to-bottom manner, then other structure features are cleaned in a nearest sequence, the corresponding nozzle is selected according to the structure features, and the same type of structure features is cleaned in a top-to-bottom manner, thereby sequentially realizing the cleaning of all structure features. The method can replace manual cleaning to realize automatic cleaning, the cleaning quality is more stable, the disorderly cleaning in the cleaning process is avoided to prevent mutual contamination, the cleaning time is shortened, and the cleaning of all structure features of the shell is in place, thereby effectively meeting the requirements of the production process.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aero-engine shell cleanliness control, and relates to an automatic pressure flushing method for a complex shell. BACKGROUND

[0002] Pressure flushing is a conventional product surface cleaning technology, but for products with different structural shapes, the cleaning situation is complex, and problems such as low cleaning efficiency, poor cleaning effect and the need for repeated flushing are prone to occur.

[0003] In particular, for an aero-engine, the shell part has the following characteristics: 1. large volume, complex shape and internal cavity structure; 2. numerous oil paths and complex communication types; 3. frame type structure, difficult to process and easy to deform; 4. strict shape and position tolerance and high dimensional accuracy of functional parts; 5. many cross-sectional views and dimensions of design drawings, difficult to understand; 6. many processing procedures, strong correlation between procedures, many control links and long manufacturing cycle. Most of the shells of the fuel control system of an aero-engine contain various complex structures such as multiple internal cavities, threads, deep holes and through holes, and in the traditional manual pressure flushing process, a pressure flushing gun needs to be held by hand to flush each hole, the flushing pressure is 6 MPa, and the cleaning time of a single shell is generally about 1 hour.

[0004] For aero-engine complex shells, products with complex structures and large volumes, the existing technology is complex and difficult to automate, and it is difficult to ensure cleaning quality, so the traditional manual cleaning method is basically used for pressure flushing of the products. However, the existing manual cleaning technology is greatly affected by human factors during the cleaning process, has low cleaning efficiency, unstable cleaning quality and poor consistency, affects product performance, and in severe cases, causes product jamming and affects product production cycle. SUMMARY

[0005] The purpose of the present application is to provide an aero-engine complex shell pressure flushing method with good cleaning quality, good consistency and high efficiency.

[0006] The technical solution of the present application is as follows:

[0007] An aero-engine complex shell pressure flushing method, after the shell to be cleaned is clamped and positioned, the shell structure characteristics are analyzed, the cleaning nozzle is determined according to different structure characteristics, then the cleaning scheme is determined according to the cleaning nozzle and the structure characteristics, and the cleaning path is planned, wherein when the cleaning path is planned, according to the structure characteristics to be cleaned, the same nozzle is selected, the same type of structure characteristics is cleaned according to the principle of from top to bottom, then other structure characteristics are cleaned in the order of proximity, and according to the structure characteristics, the corresponding nozzle is selected, and the same type of structure characteristics is cleaned from top to bottom, to realize the cleaning of all structure characteristics in turn.

[0008] After cleaning a round according to the planning cleaning path, select the straight jet nozzle, from top to bottom, clean all the structural features to ensure the final cleaning effect.

[0009] For the shell structure features, determine the nozzle, and when planning the path, determine the spray washing time of each structural feature. For simple structures, the flushing time is short, and for complex structures, the flushing time is long. For hole and groove structures without other internal structures, the flushing time is generally 1-6 seconds, and for cavities with other components and substructures inside, the flushing time is generally not less than 2 seconds. The flushing time can be extended according to the complexity of the structure, and the cleaning quality and flushing efficiency are balanced to achieve the best effect.

[0010] During the cleaning process, the angle of the turntable for clamping the shell rotates in the counterclockwise direction to realize clockwise flushing. Adjust the relative spatial position of the shell structure feature and the cleaning nozzle by rotating the turntable to facilitate nozzle flushing; during the flushing process, the turntable rotates in the counterclockwise direction in one direction to avoid repeated rotation of the turntable, which reduces the flushing efficiency.

[0011] According to different structural features, the pulse pressure and frequency of pressure flushing are set. Adjust the pressure of the flushing liquid to form high and low pressure alternating flushing pulses, which is beneficial to the flow of flushing liquid in the complex shell deep cavity, and avoids vortex in the dead angle of the complex shell deep cavity when flushing at a certain position, which affects the flushing effect.

[0012] When flushing a blind hole,

[0013] Use the straight jet nozzle to reach the fixed point position from the safe position and stay for flushing. Use the reflected backflow generated by the high-pressure flushing liquid impacting the blind hole bottom to flush the hole wall and clean the structural feature. When the blind hole intersects with other structures, set the pulse pressure and frequency of the pressure flushing to form high and low pressure alternating flushing pulses, which is beneficial to the flow of flushing liquid in the complex shell deep cavity, and improves the flushing effect.

[0014] When flushing a through hole,

[0015] When the diameter of the through hole is less than or equal to the diameter of the nozzle, use the straight jet nozzle to reach the fixed point position from the safe position and stay for flushing. Use the flushing liquid to flush the hole wall to clean the structural feature. When the diameter of the through hole is slightly larger than the diameter of the nozzle, use the straight jet nozzle to reach the fixed point position at an angle from the safe position and stay for flushing. Use the flushing liquid to flush the hole wall and generate reflected backflow to clean the structural feature. When the diameter of the through hole is much larger than the diameter of the nozzle, use the straight jet nozzle to reach the hole opening from the safe position, so that the nozzle is opposite to the hole wall and is located at a position where 1 / 5 of the nozzle diameter is outside the hole diameter. Use 4 / 5 of the flushing liquid to flush the hole wall and move along the circumference to clean the structural feature.

[0016] Different aperture structures use different cleaning methods. Small aperture structures use high efficiency methods to achieve cleaning effect. Large aperture structures use relatively complex operations to avoid liquid directly passing through the hole wall, resulting in insufficient cleaning effect.

[0017] When the slot is washed,

[0018] When the slot is washed, the washing liquid is used to wash the slot bottom and the slot wall, and the reflected backflow is generated. When the slot width is less than the diameter of the nozzle, the structure is washed clean; when the slot width is greater than or equal to the diameter of the nozzle, the structure is washed clean.

[0019] When the cavity is washed,

[0020] There are two methods. One is to use a straight jet nozzle to reach the cavity from a safe position, so that the nozzle is opposite to the cavity wall, and the nozzle diameter is 1 / 5 outside the cavity wall. 4 / 5 of the washing liquid is used to wash the cavity wall, and the reflected backflow is generated along the circumference. At the same time, the reflected backflow generated by the washing liquid impacting the cavity bottom is used to wash the structure feature clean. The second method is to use a shower nozzle to reach a certain distance into the cavity from a safe position, and to stay and wash. The washing liquid is used to wash the cavity bottom and the cavity wall, and the reflected backflow is generated. The structure feature is washed clean. For complex cavities, increase the pulse pressure and frequency of the set pressure washing, form the washing pulse of high pressure and low pressure alternately, which is beneficial to the flow of washing liquid in the complex shell deep cavity, and improve the washing effect.

[0021] The former cleaning method is flexible but low in efficiency, and the latter is high in efficiency and can realize the vertical water flow on the cavity wall, but the shower nozzle is thick and needs to be deep into the cavity, which needs more space. According to different situations, the cleaning effect is achieved by selecting the scheme.

[0022] When the surface is washed,

[0023] A straight jet nozzle is used to reach the surface starting position from a safe position. The nozzle is inclined at an angle, and the angle with the surface is in the range of 30 degrees to 80 degrees. The surface is washed along the S-shaped trajectory. The smaller the angle with the surface, the smaller the impact on the surface, the larger the range that can be washed, and the larger the spacing of the S-shaped trajectory. At the same time, the rotation of the turntable can be combined to move the washing liquid on the surface at different positions, so that the structure feature is washed clean.

[0024] In addition, when the gap is washed, the washing method of the through hole and the slot can be referred to according to the size and length of the gap.

[0025] The technical effect of the present application is that the present application designs a cleaning method, formulates a cleaning route, and can quickly match and select a nozzle according to different shell structure characteristics, and determines a cleaning scheme, so that a better cleaning effect can be achieved in the shortest time. The present application can replace manual cleaning to realize cleaning automation, make the cleaning quality more stable and consistent, avoid the influence of unstable human operation on the cleaning quality, reduce the quality problems of the complex engine shell cleanliness, and reduce the quality loss caused thereby. The disorderly cleaning during the cleaning process is avoided, mutual pollution and repeated cleaning problems are avoided, the cleaning time is shortened to only 80% of the original, the shell structure characteristics are cleaned in place, and the requirements of the production process can be effectively met. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a side view of the E-direction surface of the right turntable at 0° of the embodiment of the present application;

[0027] Figure 2 is a plan view of the E-direction surface of the right turntable at 0° of the embodiment of the present application;

[0028] Figure 3 is a side view of the A-direction surface of the right turntable at 0° of the embodiment of the present application;

[0029] Figure 4 is a front view of the A-direction surface of the right turntable at 0° of the embodiment of the present application;

[0030] Figure 5 is the A-direction structure identification of the right turntable at 0° of the embodiment of the present application;

[0031] Figure 6 is the A-direction cleaning track of the right turntable at 0° of the embodiment of the present application;

[0032] Figure 7 is the blind hole cleaning of the right turntable at 0° of the embodiment of the present application;

[0033] Figure 8 is the cavity cleaning of the right turntable at 0° of the embodiment of the present application;

[0034] Figure 9 is the sealing groove cleaning of the right turntable at 0° of the embodiment of the present application;

[0035] Figure 10 is the B-face structure identification of the right turntable at 90° of the embodiment of the present application;

[0036] Figure 11 is the B-direction cleaning track of the right turntable at 90° of the embodiment of the present application;

[0037] Figure 12is the C direction structure identification of the right turntable 180° of some embodiments of the present application;

[0038] Figure 13 is the C direction flushing trajectory of the right turntable 180° of some embodiments of the present application;

[0039] Figure 14 is the flushing large hole of the right turntable 180° of some embodiments of the present application;

[0040] Figure 15 is the D face structure identification of the right turntable 270° of some embodiments of the present application;

[0041] Figure 16 is the D direction flushing trajectory of the right turntable 270° of some embodiments of the present application;

[0042] Figure 17 is the shower flushing trajectory of the right turntable 90° of some embodiments of the present application;

[0043] Figure 18 is the shower flushing trajectory of the right turntable 270° of some embodiments of the present application;

[0044] Figure 19 is the shower nozzle flushing hole d33 of the right turntable 270° of some embodiments of the present application;

[0045] Figure 20 is the 0°E direction structure identification of the left turntable of some embodiments of the present application;

[0046] Figure 21 is the 0°E direction flushing trajectory of the left turntable of some embodiments of the present application;

[0047] Figure 22 is the 180°F direction structure identification of the left turntable of some embodiments of the present application;

[0048] Figure 23 is the 180°F direction flushing trajectory of the left turntable of some embodiments of the present application. DETAILED DESCRIPTION

[0049] The present application will be further described below in conjunction with the drawings and embodiments, but not as the basis for limiting the present application.

[0050] Embodiment 1.

[0051] Taking some automatic pressure flushing machine as an example, each component has two positioning modes on the left and right two turntables, and the angular positioning pins of the two turntables are on the inner side of the center pin. The flushing direction is generally divided into horizontal and vertical directions, and can also be flushed at any angle according to the angle of the flushing structure. The flushing rule is to use straight flushing nozzles to flush the surface, wash the fixed point, sweep the hole wall, cavity and groove in sequence; then change the shower nozzle to flush, and finally use the straight flushing nozzle to fine all structures in a certain order.

[0052] The flushing process is explained in detail using the aircraft engine oil regulator housing as an example:

[0053] For the right turntable, the lateral flushing surface is A at 0°, B at 90°, C at 180°, and D at 270°; longitudinal flushing is E; and the positioning surface is F. For the left turntable, the lateral flushing surface is F at 0°, E at 180°, and B. Since there is no interference area in the six-sided lateral flushing of the left and right worktables of this housing, longitudinal flushing is not involved.

[0054] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 When the right turntable angle is 0°, use a direct jet nozzle to rinse the outer surfaces in directions E and A. During surface rinsing, use the direct jet nozzle to move from a safe position to the starting position on the surface. The nozzle is tilted at an angle of 30° to 80° with the surface, rinsing along an S-shaped trajectory. The smaller the angle with the surface, the less impact force on the surface, the larger the rinsing area, and the greater the spacing of the S-shaped trajectory. This can be combined with the rotation of the turntable to move the rinsing fluid to different positions on the surface, thereby quickly cleaning the structural features.

[0055] Please see Figure 5 , Figure 6 , Figure 7 The holes a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, and a15 are sequentially flushed at designated points. These holes are all blind holes. A direct-jet nozzle is used to flush from a safe position to the designated point, utilizing the reflected backflow generated by the high-pressure flushing fluid impacting the bottom of the blind hole to scour the hole wall and clean the structural feature. When the blind hole intersects with other structures, a set pressure and frequency pulse flushing is applied, forming alternating high-pressure and low-pressure flushing pulses. This facilitates the flow of flushing fluid inside the deep cavities of complex shells, improving the flushing effect.

[0056] Please see Figure 8 The walls of cavities a16 and a17 are flushed in sequence along the trajectory for two circles. The former method is selected from the two methods of rinsing the cavity. A direct jet nozzle is used to reach the cavity from a safe position, so that the nozzle is facing the cavity wall and 1 / 5 of the nozzle diameter is on the outside of the cavity wall. 4 / 5 of the flushing liquid is used to flush the cavity wall and move in a circle. At the same time, the reflected backflow generated by the flushing liquid impacting the bottom of the cavity is used to clean the structural features.

[0057] Please see Figure 9Rinse the sealing groove a18 twice along the central trajectory. During rinsing, rinse along the center of the sealing groove following the contour of the groove body. Utilize the rinsing fluid's impact on the bottom and walls of the groove, and the resulting reflected backflow, to thoroughly clean this structural feature.

[0058] Please see Figure 10 , Figure 11 When the right turntable angle is 90°, flush the outer surface of B; flush holes b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, and b14 in sequence, pausing for 6 seconds at each hole; flush the wall of cavity b15 two times along the trajectory.

[0059] Please see Figure 12 , Figure 13 When the right turntable angle is 180°, flush the outer surface of C; sequentially flush holes c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, and c17, pausing for 6 seconds at each hole. Please refer to [link / reference]. Figure 14 As shown, when flushing the large hole, sweep the flushing fluid around the hole three times (c18, c19, c20). Use a direct-jet nozzle to reach the hole opening from a safe position, so that the nozzle is directly facing the hole wall and 1 / 5 of the nozzle diameter is outside the hole diameter. Use 4 / 5 of the flushing fluid to flush the hole wall and move in a circular motion to clean the structural feature.

[0060] Please see Figure 15 , Figure 16 When the right turntable angle is 270°, flush the outer surface of D; sequentially flush holes d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13, d14, d15, d16, d17, d18, d19, d20, d21, d22, d23, d24, d25, d26, and d27, pausing for 6 seconds at each hole; then sweep the circumferential flushing holes d28, d29, d30, d31, and d32 three times.

[0061] Please see Figure 17 , Figure 18 Replace the shower head, and rotate the right-hand turntable sequentially to 90° and 270°, inserting it into the holes to flush b16, b17, d33, and d34 respectively: 6MPa for 2 seconds, 0MPa for 1 second, 6MPa for 2 seconds, 0MPa for 1 second, and 6MPa for 2 seconds. The flushing fluid cleans the cavity bottom and walls, and the resulting reflected backflow. Set the pulse pressure and frequency for the flushing, creating alternating high and low pressure pulses to facilitate fluid flow within the complex, deep cavities of the shell, improving the flushing effect. Figure 19 Among them, the shower head flushing hole d33.

[0062] The straight jetting nozzle is used to clean the E, A, B, C and D outward surfaces, each hole, cavity and groove structure from top to bottom, and each hole is cleaned for 4 seconds, the cavity and groove are swept for 1 circle, and the large hole is swept for 2 circles.

[0063] The part is replaced on the left turntable for cleaning.

[0064] Please refer to Figure 20 , Figure 21 When the angle of the left turntable is 0°, the straight jetting nozzle is used to clean the D and E outward surfaces; the holes e1, e2, e3, e4 and e5 are cleaned in sequence, and each hole is cleaned for 6 seconds; and the hole e6 is cleaned for 3 circles.

[0065] Please refer to Figure 22 , Figure 23 When the angle of the left turntable is 0°, the straight jetting nozzle is used to clean the D and E outward surfaces; the holes f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14, f15, f16, f17, f18, f19, f20, f21, f22, f23, f24, f25, f26, f27, f28, f29, f30, f31, f32, f33, f34, f35, f36, f37, f38, f39 are cleaned in sequence, and each hole is cleaned for 6 seconds as shown in Figure 18 ; the holes f40, f41, f42, f43, f44, f45, f46 and f47 are cleaned for 3 circles; and the cavity f48 is cleaned for 2 circles.

[0066] The D, E and F outward surfaces, each hole, cavity and groove structure are cleaned in sequence from top to bottom, and each hole is cleaned for 4 seconds, the cavity and groove are swept for 1 circle, and the large hole is swept for 2 circles.

[0067] The aero-engine oil regulator shell 20 pieces in one batch, a total of two batches are verified by using the conventional cleaning method and the cleaning method of the present application, and the first and last pieces are detected every 3 pieces after the two batches are cleaned. The verification results are as follows: (1) the particle size meets the standard by using the conventional cleaning method, but the result fluctuates greatly, and the working time is 1220 minutes. (2) the particle size meets the standard by using the cleaning method of the present application, and the result fluctuates less, and the working time is 955 minutes, which is 20% shorter than the existing conventional method.

Claims

1. A method of pressure washing a complex case of an aeroengine, characterized in that, After the shell to be cleaned is clamped and positioned, the shell structure features are analyzed, the cleaning nozzle is determined according to different structure features, then the cleaning scheme is determined according to the cleaning nozzle and the structure features, and the cleaning path is planned, wherein, when the cleaning path is planned, according to the structure features to be cleaned, the same nozzle is selected to clean the same type of structure features according to the principle of from top to bottom, then other structure features are cleaned in the order of proximity, and according to the structure features, the corresponding nozzle is selected, and then the same type of features is cleaned from top to bottom, and the cleaning of all structure features is sequentially realized. The structure features of the shell to be cleaned include a groove, when the groove is flushed, the groove is flushed along the center of the groove according to the contour trajectory of the groove, when the width of the groove is less than the diameter of the nozzle, the groove bottom and the groove wall are flushed by the flushing liquid and the reflected backflow generated thereby, and the structure features are flushed clean; when the width of the groove is greater than or equal to the diameter of the nozzle, the groove bottom is flushed by the flushing liquid and the reflected backflow generated thereby, and the structure features are flushed clean.

2. The aircraft engine complex case pressure flush method of claim 1, wherein, After one round of cleaning according to the planned cleaning path, a straight flushing nozzle is selected, and all structure features are cleaned from top to bottom.

3. The aircraft engine complex case pressure flush method of claim 1, wherein, After the nozzle is determined according to the structure features of the shell, the washing time of each structure feature is determined when the path is planned.

4. The aircraft engine complex case pressure flush method of claim 1, wherein, The structure features of the shell to be cleaned also include the surface of the shell, a cavity, a blind hole, a through hole and a gap.

5. The aircraft engine complex case pressure flush method of claim 1, wherein, During the cleaning process, the relative spatial position of the shell structure features and the cleaning nozzle is adjusted by rotating the turntable, and the angle of the turntable for clamping the shell is rotated in a counterclockwise single direction.

6. The aircraft engine complex case pressure flush method of claim 1, wherein, According to the structure features of the shell, the pulse pressure and frequency of pressure flushing are set, the pressure of the flushing liquid is adjusted, and the flushing pulse of high pressure and low pressure alternately is formed to flush.

7. The aircraft engine complex case pressure flush method of claim 1, wherein, When the through hole is flushed, when the diameter of the through hole is less than or equal to the diameter of the nozzle, the straight flushing nozzle is used to reach the fixed point position from the safe position and stay to flush, the flushing liquid is used to flush the hole wall, and the structure features are flushed clean; when the diameter of the through hole is slightly greater than the diameter of the nozzle, the straight flushing nozzle is used to reach the fixed point position at an angle from the safe position and stay to flush, the flushing liquid is used to flush the hole wall and the reflected backflow generated thereby, and the structure features are flushed clean; when the diameter of the through hole is much greater than the diameter of the nozzle, the straight flushing nozzle is used to reach the hole opening from the safe position, the nozzle is directly opposite the hole wall, and the nozzle is in a position where 1 / 5 of the nozzle diameter is outside the hole diameter, 4 / 5 of the flushing liquid is used to flush the hole wall, and the structure features are flushed clean.

8. The aircraft engine complex case pressure flush method of claim 1, wherein, When the cavity is flushed, the straight flushing nozzle is used to reach the cavity from the safe position, the nozzle is directly opposite the cavity wall, and the nozzle is in a position where 1 / 5 of the nozzle diameter is outside the cavity wall, 4 / 5 of the flushing liquid is used to flush the cavity wall, and the structure features are flushed clean.

9. The aircraft engine complex case pressure flush method of claim 1, wherein, When the surface is flushed, the straight flushing nozzle is used to reach the surface starting position from the safe position, the nozzle is inclined at an angle, the surface is flushed along an S-shaped trajectory, and the flushing liquid can be moved at different positions on the surface by combining with the rotation of the turntable, and the structure features are flushed clean.

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