Engine shell composite skirt and manufacturing method and manufacturing device thereof

Abstract

The invention discloses an engine shell composite skirt and a manufacturing method and device thereof, and belongs to the technical field of engine shells, the engine shell composite skirt comprises a skirt body, the skirt body is formed by splicing thirty-six skirt sections into a circular ring shape, skirt teeth are arranged at one end of the skirt body, a folded edge is arranged at the other end of the skirt body, corner box positioning holes are formed in the skirt body, and the corner box positioning holes are formed in the skirt body. A fillet is arranged on the inner side of the joint of the skirt body and the folded edge. By arranging the driving motor, the millstone, the driving assembly and the telescopic assembly, during use, a worker places the skirt body on the table, during grinding, the worker enables the frame to drive the driving motor and the millstone to move to the position, needing to be ground, of the outer circle face of the skirt body through the driving assembly, and then the driving motor is started to enable the millstone to rotate; and finally, the driving motor and the grinding disc can move close to the skirt body through the telescopic assembly to grind the outer circle face of the skirt body, personal errors are avoided, and therefore the grinding precision of the skirt body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine casings, and in particular to an engine casing composite skirt and a manufacturing method and a manufacturing device thereof. Background Art

[0002] With the development of the composite materials industry, the composite skirt of the solid rocket engine case is constantly updated, and the original metal materials are gradually replaced by a large proportion of composite materials. Due to the high specific strength, specific stiffness and superior internal pressure resistance of composite materials, the main function of the engine composite skirt is to connect the engine to the interstage or to other compartment components. Important load-bearing structural components; compared with the commonly used engine case metal skirt, the engine composite skirt can reduce the skirt weight by 40%, thereby improving the engine's operating efficiency and reducing the cost of solid rocket launches; in the production and manufacturing process of the engine composite skirt, the staff needs to use a grinding device to grind the outer cylindrical surface of the composite skirt to ensure that the composite skirt can be well loaded into the upper skirt tooling for assembly.

[0003] However, there are some problems with the prior art: when using the existing grinding device, the staff usually needs to hold the grinding equipment to grind the outer cylindrical surface of the composite skirt, but the grinding accuracy of the outer cylindrical surface of the composite skirt must be high, and it needs to be ground until it can just fit into the upper skirt tooling, and the staff holding the grinding equipment is often prone to increasing the grinding error due to the shaking of their arms and hands, thereby affecting the subsequent assembly effect of the composite skirt. Therefore, we propose an engine casing composite skirt and its manufacturing method and manufacturing device. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an engine casing composite skirt and a manufacturing method and a manufacturing device thereof.

[0005] The object of the present invention is achieved in this way: a composite skirt for an engine casing, comprising a skirt body, wherein the skirt body is formed by thirty-six skirt petals spliced ​​into a circular ring shape, one end of the skirt body is provided with skirt teeth, the other end of the skirt body is provided with a folded edge, a corner box positioning hole is provided on the skirt body, a rounded corner is provided on the inner side of the connection between the skirt body and the folded edge, and a margin area is provided on the outer side of the connection between the skirt body and the folded edge.

[0006] A method for manufacturing a composite skirt of an engine casing comprises the following steps: S1. Composite skirt production: After the preparation of the laying tooling, the skirt body is laid and cured. After the curing, it is tested and initially machined. After the processing, it is demoulded and tested again; S2, composite shell upper skirt: the two skirts are butted and the outer cylindrical surface is ground, and then positioned on the upper skirt tooling. After the positioning hole is made in the skirt body, the skirt is separated from the upper skirt tooling, and the skirt is installed on the shell, and the skirt is fine-tuned to the theoretical position and then locked; S3. Final machining of composite skirt: Install the tooling and press the shell, perform rough machining, semi-finishing machining and finishing machining on the skirt, and retain the inspection data after machining.

[0007] Optionally, step S1 specifically includes: S1-1. Use gasoline to remove the oil seal on the surface of the paving tooling, then clean it three times with acetone, apply at least three times of release agent after cleaning, check whether the paving tooling has any scratches or damage, and then install the skirt petals; S1-2. Pave according to the skirt section ply diagram, first pave other positions outside the excess area, perform four cold presses and one pre-curing, and after the pre-curing is completed, use 180-grit sandpaper to roughen the paving area, then pave the excess area, perform one cold press and one final curing; S1-3. After curing is completed and cleaned, the quality inspector will test the size of the skirt and perform non-destructive testing; S1-4. After the inspection, the initial machining is carried out, and the initial machining is carried out strictly in accordance with the initial machining drawings; S1-5. Remove the positioning pins and screws in the paving tooling, then use tools to take out the skirt removal module, and require the quality inspection department to re-test the outer diameter and thickness of the skirt, and perform non-destructive testing again.

[0008] Optionally, step S2 specifically includes: S2-1. Mesh and butt the skirt teeth of the two skirt bodies together and fix them. Use a square ruler to draw the quadrant I reference line perpendicular to the end faces of the two skirt bodies at any point where the skirt teeth are inserted; grind the outer circular surfaces of the two skirt bodies with the inner circular surface of the upper skirt tooling, and position the two skirt bodies on the quadrant I engraved lines of the two upper skirt toolings according to the quadrant I reference line; S2-2, first make the corner box positioning holes on the skirt body through the four quadrant tooling holes on the upper skirt tooling, then make all the remaining holes on the skirt body, clearly mark each quadrant on the skirt body, separate the skirt body from the upper skirt tooling, and remove the burrs on the positioning holes; S2-3. Install flat keys on the front and rear surfaces of the mandrel, and position the upper skirt tooling corresponding to the flat key positions, so that the two upper skirt toolings are respectively installed on both sides of the shell through the mandrel on the shell, and use a crane to hoist the rear upper skirt tooling on the outer surface of the skirt body through the mandrel; S2-4. Use the hydraulic cylinder to fine-tune the two skirts to the theoretical position, close the high-pressure ball valve connected to the hydraulic cylinder to fix the extension of the hydraulic cylinder piston rod, remove the hydraulic oil pipe, keep the hydraulic cylinder and the top plate connected to maintain the shape and position tolerance of the two skirts, and then implement subsequent operations. After the subsequent operations are completed, remove the hydraulic cylinder and the top plate, install the adjustment components at the eight corresponding notches on the upper skirt tooling and lock them.

[0009] Optionally, step S3 specifically includes: S3-1. Install the tooling. Place the shell with the skirt and the upper skirt tooling on the tooling and press it tightly. Check that the gap between the shell and the tooling is not greater than 0.05mm. Use copper foil of corresponding thickness to fill the unqualified part. Repeat twice until the front and rear datums are basically consistent, then perform rough machining on the skirt. S3-2, according to the above process clamping method, use a tool with 2×φ8 process positioning pins to place the rear joint face up on the tool, and level the exposed part of the front skirt end face as the reference plane; select the φ8 process pin hole position in the I and III quadrants for positioning, and use the center of the inner hole of the rear joint and the center line of the 2×φ8 positioning pins of the tool as the processing reference; repeat twice until the front and rear references are basically consistent, and then perform semi-finishing machining on the skirt body; S3-3. According to the clamping method of the above process, use a tool with 2×φ14 process locating pins to place the rear joint face up on the tool, and level the exposed part of the front skirt end face as a reference plane; select the φ14 process pin hole position in quadrants I and III for positioning, and use the center of the inner hole of the rear joint and the center line of the 2×φ14 locating pins of the tool as the processing reference; repeat twice until the front and rear references are basically consistent, and then perform fine machining on the skirt body.

[0010] A manufacturing device for a composite skirt of an engine casing comprises a pillar, the top of the pillar is fixedly connected to a table, the bottom of the table is provided with a frame, the frame and the pillar are connected via a driving assembly, a driving motor is provided on the frame, the driving motor and the frame are connected via a telescopic assembly, and the output shaft of the driving motor is fixedly connected to a grinding disc.

[0011] Optionally, a guide rail is fixedly installed on the bottom end of the table, and the frame is slidably connected to the guide rail. The driving assembly includes a gear ring, which is fixedly sleeved on the outer surface of the pillar. A brake motor is fixedly installed on the frame, and the output shaft of the brake motor is fixedly connected to a gear, and the gear is meshingly connected to the gear ring.

[0012] Optionally, the telescopic assembly includes a cylinder, the cylinder is fixedly mounted on a frame, a piston rod of the cylinder is fixedly connected to a tray, the tray is slidably connected to the frame, and the drive motor is fixedly mounted on the tray.

[0013] Optionally, an electric push rod is fixedly installed on the frame, the piston rod of the electric push rod is fixedly connected to a lifting plate, a servo motor is fixedly installed on the lifting plate, the output shaft of the servo motor is fixedly sleeved with a bidirectional screw rod, both sides of the outer surface of the bidirectional screw rod are threadedly connected with clamps, and the opposite surfaces of the two clamps are fixedly installed with rubber pads.

[0014] Optionally, the length of the two rubber pads is the same as the length of the clamping plate, and the opposite surfaces of the two rubber pads are both arc-shaped.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a driving motor, a grinding disc, a driving assembly and a telescopic assembly. When in use, the staff places the skirt on a table. When grinding, the staff uses the driving assembly to make the frame drive the driving motor and the grinding disc to move to the position where the outer circumferential surface of the skirt needs to be ground, and then starts the driving motor to rotate the grinding disc. Finally, the telescopic assembly can be used to make the driving motor and the grinding disc move close to the skirt to grind the outer circumferential surface of the skirt, thereby avoiding human errors and improving the grinding accuracy of the skirt.

[0016] 2. The present invention provides an electric push rod, a servo motor, a bidirectional screw rod and a clamping plate. Before grinding the outer cylindrical surface of the skirt body, the staff can start the electric push rod to make the lifting plate drive the clamping plate to descend, so that the two rubber pads are respectively located on the inner and outer sides of the skirt body, and then start the servo motor to make the bidirectional screw rod rotate, so that the two clamping plates can drive the two rubber pads to move toward each other, clamping the skirt body near the grinding position, thereby ensuring the stability of the skirt body during grinding, and further improving the grinding accuracy of the outer cylindrical surface of the skirt body.

[0017] 3. The present invention arranges rubber pads. Since rubber has a soft nature, deformation or wear of the skirt caused by rigid contact can be avoided. The arc-shaped design of the opposing surfaces of the two rubber pads can better fit the inner and outer walls of the skirt when clamping the skirt, thereby improving the clamping effect of the skirt. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the skirt structure provided by the present invention; Figure 2 It is a schematic diagram of the cross-section ply of the skirt provided by the present invention; Figure 3 It is a schematic diagram of the connection structure of two skirt bodies provided by the present invention; Figure 4 It is a schematic diagram of the disassembly structure of the skirt body and the upper skirt tooling provided by the present invention; Figure 5 It is a structural schematic diagram of the housing provided by the present invention; Figure 6 It is a schematic diagram of the structure of the skirt body provided by the present invention when it is assembled; Figure 7 It is a schematic diagram of the later stage fixing structure of the upper skirt tooling provided by the present invention; Figure 8 yes Figure 4 A schematic diagram of the local enlarged structure at point A in the middle; Fig. 9 It is a structural schematic diagram of the manufacturing device provided by the present invention; Fig.10 It is a structural schematic diagram of the bottom of the table provided by the present invention; Fig.11 It is a structural schematic diagram of the top of the lifting plate provided by the present invention; Fig.12 It is a structural schematic diagram of the side surface of the rubber pad provided by the present invention.

[0020] In the figure: 1. skirt body; 2. skirt teeth; 3. folded edge; 4. fillet; 5. allowance area; 6. corner box positioning hole; 7. upper skirt tooling; 8. shell; 9. mandrel; 10. flat key; 11. top plate; 12. hydraulic cylinder; 13. adjustment assembly; 14. fixed angle box; 15. pillar; 16. table; 17. frame; 18. drive motor; 19. grinding disc; 20. guide rail; 21. gear ring; 22. brake motor; 23. gear; 24. cylinder; 25. tray; 26. electric push rod; 27. lifting plate; 28. servo motor; 29. ​​bidirectional screw; 30. splint; 31. rubber pad. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figures 1 to 12 As shown, an engine casing composite skirt and a manufacturing method and a manufacturing device thereof are provided in an embodiment of the present invention, wherein, an engine casing composite skirt comprises a skirt body 1, wherein the skirt body 1 is formed into a circular ring shape by splicing thirty-six skirt petals, a skirt tooth 2 is arranged at one end of the skirt body 1, a folded edge 3 is arranged at the other end of the skirt body 1, a corner box positioning hole 6 is opened on the skirt body 1, a fillet 4 is arranged on the inner side of the connection between the skirt body 1 and the folded edge 3, and a margin area 5 is arranged on the outer side of the connection between the skirt body 1 and the folded edge 3.

[0023] The skirt is made of T700 fiber and high-performance high-temperature epoxy resin, and the skirt body 1 connection area is made of titanium alloy. The present invention also provides a method for manufacturing the composite skirt, comprising the following steps: S1. Composite skirt production: After the preparation of the laying tooling is completed, the skirt body 1 is laid and cured. After the curing is completed, it is tested and initially machined. After the processing is completed, it is demoulded and tested again; S2, composite shell upper skirt: two skirt bodies 1 are butted and the outer cylindrical surface is ground, and then positioned on the upper skirt tooling 7. After positioning holes are made in the skirt body 1, the skirt body 1 is separated from the upper skirt tooling 7, and the skirt body 1 is installed on the shell 8. The skirt body 1 is fine-tuned to the theoretical position and then locked; S3, final machining of the composite skirt: install the tooling and press the shell 8, perform rough machining, semi-finishing machining and finishing machining on the skirt body 1, and retain the inspection data after machining.

[0024] Furthermore, step S1 specifically includes: S1-1. Use gasoline to remove the oil seal on the surface of the paving tooling, then clean it three times with acetone, apply at least three times of release agent after cleaning, check whether the paving tooling has any scratches or damage, and then install the skirt petals; The thirty-six petals of the skirt are installed on the inner ring of the paving tooling using positioning pins and bolts. After installation, the outer surfaces of each petal are required to be smoothly combined and the installation gap between the petals should be less than 0.02mm.

[0025] S1-2, according to the skirt section ply diagram, pave the other positions except the excess area 5 first, perform four cold pressings and one pre-curing, after the pre-curing is completed, use 180-grit sandpaper to roughen the pavement area, then pave the excess area 5, perform one cold pressing and one final curing; During the paving process, care must be taken to ensure that no debris is mixed in the one-way material, and vacuum compaction must be carried out strictly in accordance with the process card. The entire process must be supervised and confirmed by quality inspection and process.

[0026] S1-3, after curing is completed and cleaned, the quality inspector will inspect the size of the skirt 1 and perform non-destructive testing; S1-4. After the inspection, the initial machining is carried out, and the initial machining is carried out strictly in accordance with the initial machining drawings; During the machining process, each stop point must be confirmed by quality inspection and process before operation can continue.

[0027] S1-5. Remove the positioning pins and screws in the paving tooling, then use tools to remove the skirt 1 removal module, and require the quality inspection department to re-test the outer diameter and thickness of the skirt 1, and perform non-destructive testing again.

[0028] Copper gaskets, soft pads, hammers, wrenches, etc. can be used to remove two to four blocks from around the paving tooling to loosen the skirt 1. After loosening, the skirt 1 can be removed from the mold; size detection requires measuring multiple sets of data and issuing relevant reports.

[0029] Furthermore, step S2 specifically includes: S2-1, mesh the skirt teeth 2 of the two skirt bodies 1 together and fix them, and use a square ruler to draw a quadrant I reference line perpendicular to the end faces of the two skirt bodies 1 at any point where the skirt teeth 2 are inserted; grind the outer circumferences of the two skirt bodies 1 with the inner circumference of the upper skirt tooling 7, and position the two skirt bodies 1 on the quadrant I engraved lines of the two upper skirt tooling 7 according to the quadrant I reference line; The butt joint of the skirt teeth 2 must be in the best matching state, that is, the butt joint gap of the skirt teeth 2 is uniform and there is no interference between the teeth; pay attention to ensure that the outer circle of the skirt body 1 is evenly matched during the grinding process, and ensure that the skirt body 1 is ground until it can be just installed in the upper skirt tooling 7.

[0030] S2-2, firstly, make the corner box positioning holes 6 on the skirt body 1 through the four quadrant tooling holes on the upper skirt tooling 7, then make all the remaining holes on the skirt body 1, clearly mark each quadrant on the skirt body 1, separate the skirt body 1 from the upper skirt tooling 7, and remove the burrs of the positioning holes; Note that when making each hole, a wooden block is used to compact the hole-making area on the inner side of the end surface of the skirt body 1, and after each hole is made, the skirt body 1 and the upper skirt tooling 7 are tightly connected together using screws and nuts in a timely manner.

[0031] S2-3, install flat keys 10 on the front and back of the surface of the mandrel 9, and place the upper skirt tooling 7 corresponding to the position of the flat key 10, so that the two upper skirt toolings 7 are respectively installed on both sides of the shell 8 through the mandrel 9 on the shell 8, and use a crane to hoist the rear upper skirt tooling 7 on the outer surface of the skirt body 1 through the mandrel 9. Operation steps: During the hoisting process, first lift the mandrel 9, move the mandrel 9 supporting the skirt body 1 to the inside of the mandrel 9, then lift the upper skirt tooling 7 and move it onto the mandrel 9, and then slowly push it; when the upper skirt tooling 7 moves to the flat key 10 and cannot be pushed in further, withdraw the skirt body 1 from the inside of the shell 8 1. Fit the skirt body 1 and the upper skirt tooling 7 according to the quadrant markings, locate the bolt holes, install eleven sets of bolts and nuts, and connect the skirt body 1 and the upper skirt tooling 7 through the fixed angle box 14. Only the bolt holes in quadrant I are left without installing bolts and nuts, and note that all nuts are on one side of the upper skirt tooling 7. Remove the extended sleeve at the rear end of the mandrel 9, install the top plate 11 at the rear end of the mandrel 9, and insert two screws through the pin holes on the mandrel 9 to limit and fix the top plate 11. Push the upper skirt tooling 7 onto the shell 8 through the hydraulic cylinder 12 on the top plate 11. The installation position is 3-5mm lower than the theoretical position.

[0032] S2-4. Use the hydraulic cylinder 12 to fine-tune the two skirts 1 to the theoretical position, close the high-pressure ball valve connected to the hydraulic cylinder 12 to fix the extension of the piston rod of the hydraulic cylinder 12, remove the hydraulic oil pipe, keep the hydraulic cylinder 12 and the top plate 11 connected to maintain the shape and position tolerance of the two skirts 1, and then implement subsequent operations. After the subsequent operations are completed, remove the hydraulic cylinder 12 and the top plate 11, and cooperate with the laser tracker to ensure that the parallelism and verticality of the two skirts 1 compared to the core shaft 9 meet the standards, and then install the adjustment assembly 13 at the eight corresponding notches of the upper skirt tooling 7 and lock it.

[0033] Furthermore, step S3 specifically includes: S3-1. Clean the machine tool workbench, the supporting surface and the positioning surface of the self-made tooling, and install the tooling. Clean the outer surface of the cylinder. After there is no foreign matter, place the shell 8 equipped with the skirt 1 and the upper skirt tooling 7 on the tooling. Use a toad clamp to apply side pressure to ensure that the shell 8 does not move. After tightening, check that the gap between the shell 8 and the tooling is not greater than 0.05mm. Use copper foil of corresponding thickness to fill the unqualified parts; repeat twice until the front and rear datums are basically consistent, then perform rough machining of the skirt 1; rough machining requires 70% of the surface to be exposed to light, and sufficient margin must be left for fine machining after rough machining; after the completion of rough machining, the inspector will inspect the front and rear skirt dimensions and retain the inspection data.

[0034] S3-2. According to the clamping method of the above process, use a tool with 2×φ8 process locating pins to place the rear joint face up on the tool, and level the exposed part of the front skirt end face as a reference plane; select the φ8 process pin hole position in quadrants I and III for positioning, and use the center of the inner hole of the rear joint and the center line of the 2×φ8 locating pins of the tool as the processing reference; repeat twice until the front and rear references are basically consistent, then perform semi-finishing machining on the skirt body 1; semi-finishing machining requires a 0.5mm margin on the end face, and sufficient margin must be left for fine machining after semi-finishing machining; after semi-finishing machining is completed, the inspector will inspect the dimensions of the front and rear skirts and retain the inspection data.

[0035] S3-3. According to the above process clamping method, use a tool with 2×φ14 process positioning pins to place the rear joint face up on the tool, and level the exposed part of the front skirt end face as the reference plane; select the φ14 process pin hole position in the I and III quadrants for positioning, and use the center of the inner hole of the rear joint and the center line of the 2×φ14 positioning pins of the tool as the processing reference; repeat twice until the front and rear references are basically consistent, and then perform fine machining on the skirt body 1. After machining, the inspector inspects the dimensions of the front and rear skirts and retains the inspection data.

[0036] The present invention also provides equipment for grinding the skirt body 1 in the above-mentioned step S2-1: a manufacturing device for a composite skirt of an engine casing, comprising a pillar 15, a table 16 fixedly connected to the top of the pillar 15, a frame 17 is provided at the bottom of the table 16, the frame 17 and the pillar 15 are connected via a driving assembly, a driving motor 18 is provided on the frame 17, the driving motor 18 and the frame 17 are connected via a telescopic assembly, and the output shaft of the driving motor 18 is fixedly connected to a grinding disc 19.

[0037] Furthermore, a guide rail 20 is fixedly installed at the bottom end of the table 16, and the frame 17 is slidably connected to the guide rail 20. The driving assembly includes a gear ring 21, which is fixedly sleeved on the outer surface of the pillar 15. A brake motor 22 is fixedly installed on the frame 17, and the output shaft of the brake motor 22 is fixedly connected to a gear 23, which is meshingly connected to the gear ring 21.

[0038] By starting the brake motor 22, the gear 23 can be rotated. Due to the rotation of the gear 23, the brake motor 22 will drive the frame 17 to rotate along the outer surface of the guide rail 20 under the meshing action of the gear 23 and the gear ring 21, so that the driving motor 18 can drive the grinding disc 19 to rotate around the outer surface of the skirt body 1, thereby facilitating the grinding of different positions of the outer cylindrical surface of the skirt body 1.

[0039] Furthermore, the telescopic assembly includes a cylinder 24 , which is fixedly mounted on the frame 17 , a piston rod of the cylinder 24 is fixedly connected to a tray 25 , the tray 25 is slidably connected to the frame 17 , and a driving motor 18 is fixedly mounted on the tray 25 .

[0040] When the grinding disc 19 moves to the position where the skirt body 1 needs to be ground as the frame 17 rotates, the staff can start the cylinder 24 so that the tray 25 drives the drive motor 18 and the rotating grinding disc 19 to move closer to the skirt body 1, thereby grinding the outer surface of the skirt body 1.

[0041] Furthermore, an electric push rod 26 is fixedly installed on the frame 17, and the piston rod of the electric push rod 26 is fixedly connected to a lifting plate 27. A servo motor 28 is fixedly installed on the lifting plate 27. The output shaft of the servo motor 28 is fixedly sleeved with a bidirectional screw rod 29. Both sides of the outer surface of the bidirectional screw rod 29 are threadedly connected with clamps 30, and the opposite surfaces of the two clamps 30 are fixedly installed with rubber pads 31.

[0042] Before grinding the outer cylindrical surface of the skirt body 1, the staff can start the electric push rod 26 to make the lifting plate 27 drive the clamping plate 30 to descend, so that the two rubber pads 31 are respectively located on the inner and outer sides of the skirt body 1, and then start the servo motor 28 to make the bidirectional screw rod 29 rotate, so that the two clamping plates 30 can drive the two rubber pads 31 to move toward each other, clamping the skirt body 1 near the grinding position, thereby ensuring the stability of the skirt body 1 during grinding, and further improving the grinding accuracy of the outer cylindrical surface of the skirt body 1.

[0043] Furthermore, the length of the two rubber pads 31 is the same as the length of the clamping plate 30 , and the opposite surfaces of the two rubber pads 31 are both arc-shaped.

[0044] The arc-shaped facing surfaces of the two rubber pads 31 can better fit the inner and outer walls of the skirt body 1 when clamping the skirt body 1, thereby improving the clamping effect on the skirt body 1.

[0045] Working principle and use process of the manufacturing device: First, the staff puts the skirt body 1 on the top of the table 16, positions the skirt body 1 through the positioning block on the top of the table 16, and then finds the position on the skirt body 1 that needs to be polished, and starts the brake motor 22. By starting the brake motor 22, the gear 23 can be rotated. Due to the rotation of the gear 23, the brake motor 22 will drive the frame 17 to rotate along the outer surface of the guide rail 20 under the meshing action of the gear 23 and the gear ring 21, so that the drive motor 18 can drive the grinding disc 19 to rotate around the outer surface of the skirt body 1, and then the grinding disc 19 can be moved to the position that needs to be polished, and then the staff can start the electric push rod 26 makes the lifting plate 27 drive the clamping plate 30 to descend, so that the two rubber pads 31 are respectively located on the inner and outer sides of the skirt body 1, and then the servo motor 28 is started to rotate the bidirectional screw rod 29, so that the two clamping plates 30 can drive the two rubber pads 31 to move toward each other, clamping the skirt body 1 near the grinding position, so as to ensure the stability of the skirt body 1 during grinding, and then start the drive motor 18 to rotate the grinding disc 19, and then set the stroke of the cylinder 24 to start the cylinder 24, so that the tray 25 drives the drive motor 18 and the rotating grinding disc 19 to move close to the skirt body 1, and finally the grinding work of the outer cylindrical surface of the skirt body 1 can be completed.

[0046] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An engine casing composite skirt, comprising a skirt body (1), characterized in that: The skirt body (1) is composed of thirty-six skirt petals spliced ​​into a circular ring shape, one end of the skirt body (1) is provided with skirt teeth (2), the other end of the skirt body (1) is provided with a folded edge (3), a corner box positioning hole (6) is opened on the skirt body (1), a rounded corner (4) is provided on the inner side of the connection between the skirt body (1) and the folded edge (3), and a margin area (5) is provided on the outer side of the connection between the skirt body (1) and the folded edge (3).

2. A method for manufacturing a composite skirt of an engine casing, using the composite skirt of an engine casing according to claim 1, characterized in that: The following steps are involved: S1. Composite skirt production: After the preparation of the laying tooling is completed, the skirt body (1) is laid and cured. After the curing is completed, it is tested and initially machined. After the processing is completed, it is demoulded and tested again; S2, composite shell upper skirt: the two skirt bodies (1) are butted together and the outer cylindrical surfaces are ground, and then positioned on the upper skirt tooling (7). After positioning holes are made in the skirt body (1), the skirt body (1) is separated from the upper skirt tooling (7), and the skirt body (1) is mounted on the shell (8). The skirt body (1) is fine-tuned to the theoretical position and then locked; S3, final machining of the composite skirt: installing the tooling and pressing the shell (8), performing rough machining, semi-finishing machining and finishing machining on the skirt body (1), and retaining the inspection data after machining.

3. The method for manufacturing a composite skirt of an engine casing according to claim 2, characterized in that: Step S1 specifically includes: S1-1. Use gasoline to remove the oil seal on the surface of the paving tooling, then clean it three times with acetone, apply at least three times of release agent after cleaning, check whether the paving tooling has any scratches or damage, and then install the skirt petals; S1-2, paving is performed according to the skirt section ply diagram, first paving other positions except the excess area (5), performing four cold pressings and one pre-curing, and after the pre-curing is completed, the paving area is roughened with 180-grit sandpaper, and then the excess area (5) is paved, performing one cold pressing and one final curing; S1-3. After curing is completed and cleaning is performed, the quality inspection personnel inspect the size of the skirt (1) and perform non-destructive testing; S1-4. After the inspection, the initial machining is carried out, and the initial machining is carried out strictly in accordance with the initial machining drawings; S1-5. Remove the positioning pins and screws in the paving tooling, then use tools to remove the skirt body (1) from the module, and require the quality inspection department to re-test the outer diameter and thickness of the skirt body (1), and perform non-destructive testing again.

4. The method for manufacturing a composite skirt of an engine casing according to claim 2, characterized in that: Step S2 specifically includes: S2-1, mesh the skirt teeth (2) of the two skirt bodies (1) together and fix them, and use a square ruler to draw a quadrant I reference line perpendicular to the end faces of the two skirt bodies (1) at any point where the skirt teeth (2) are inserted; grind the outer circumferences of the two skirt bodies (1) with the inner circumference of the upper skirt tooling (7), and position the two skirt bodies (1) on the quadrant I engraved lines of the two upper skirt toolings (7) according to the quadrant I reference line; S2-2, firstly, the corner box positioning holes (6) on the skirt body (1) are made through the four quadrant tooling holes on the upper skirt tooling (7), and then all the remaining holes on the skirt body (1) are made, and each quadrant is clearly marked on the skirt body (1), and the skirt body (1) is separated from the upper skirt tooling (7), and the burrs of the positioning holes are removed; S2-3, flat keys (10) are installed at the front and rear surfaces of the core shaft (9), and the upper skirt tooling (7) is positioned corresponding to the flat keys (10), so that the two upper skirt toolings (7) are respectively installed on both sides of the shell (8) through the core shaft (9) on the shell (8), and the rear upper skirt tooling (7) is hoisted onto the outer surface of the skirt body (1) through the core shaft (9) using a crane; S2-4. Use the hydraulic cylinder (12) to fine-tune the two skirts (1) to the theoretical position, close the high-pressure ball valve connected to the hydraulic cylinder (12) to fix the extension of the piston rod of the hydraulic cylinder (12), remove the hydraulic oil pipe, keep the hydraulic cylinder (12) and the top plate (11) connected to maintain the shape and position tolerance of the two skirts (1), and then carry out subsequent operations. After the subsequent operations are completed, remove the hydraulic cylinder (12) and the top plate (11), and install the adjustment assembly (13) at the eight corresponding notches of the upper skirt tooling (7) and lock it.

5. The method for manufacturing a composite skirt of an engine casing according to claim 2, characterized in that: Step S3 specifically includes: S3-1, installing the tooling, placing the shell (8) equipped with the skirt (1) and the upper skirt tooling (7) on the tooling and pressing it, checking that the gap between the shell (8) and the tooling is not greater than 0.05 mm, and using copper foil of corresponding thickness to fill the unqualified part; repeating twice until the front and rear datums are basically consistent, and then rough machining the skirt (1); S3-2, according to the above process clamping method, use a tool with 2×φ8 process positioning pins to place the rear joint face up on the tool, and level the exposed part of the front skirt end face as a reference plane; select the φ8 process pin hole position in the I and III quadrants for positioning, and use the center of the inner hole of the rear joint and the center line of the 2×φ8 positioning pins of the tool as the processing reference; repeat twice until the front and rear references are basically consistent, and then perform semi-finishing machining on the skirt body (1); S3-3. According to the above process clamping method, use a tool with 2×φ14 process positioning pins to place the rear joint face up on the tool, and level the exposed part of the front skirt end face as a reference plane; select the φ14 process pin hole position in the I and III quadrants for positioning, and use the center of the rear joint inner hole and the center line of the 2×φ14 positioning pins of the tool as the processing reference; repeat twice until the front and rear references are basically consistent, and then perform fine machining on the skirt body (1).

6. A manufacturing device for a composite skirt of an engine casing, comprising a support (15), characterized in that: The top of the support (15) is fixedly connected to a table (16), the bottom of the table (16) is provided with a frame (17), the frame (17) and the support (15) are connected via a driving assembly, a driving motor (18) is provided on the frame (17), the driving motor (18) and the frame (17) are connected via a telescopic assembly, and the output shaft of the driving motor (18) is fixedly connected to a grinding disc (19).

7. The manufacturing device of the composite skirt of the engine casing according to claim 6, characterized in that: A guide rail (20) is fixedly mounted on the bottom end of the table (16), and the frame (17) is slidably connected to the guide rail (20). The drive assembly includes a gear ring (21), and the gear ring (21) is fixedly sleeved on the outer surface of the pillar (15). A brake motor (22) is fixedly mounted on the frame (17), and the output shaft of the brake motor (22) is fixedly connected to a gear (23), and the gear (23) is meshingly connected to the gear ring (21).

8. The manufacturing device of the composite skirt of an engine casing according to claim 6, characterized in that: The telescopic assembly comprises a cylinder (24), the cylinder (24) being fixedly mounted on a frame (17), a piston rod of the cylinder (24) being fixedly connected to a tray (25), the tray (25) being slidably connected to the frame (17), and the drive motor (18) being fixedly mounted on the tray (25).

9. The manufacturing device of the composite skirt of an engine casing according to claim 6, characterized in that: An electric push rod (26) is fixedly mounted on the frame (17); a piston rod of the electric push rod (26) is fixedly connected to a lifting plate (27); a servo motor (28) is fixedly mounted on the lifting plate (27); an output shaft of the servo motor (28) is fixedly sleeved with a bidirectional screw rod (29); clamping plates (30) are threadedly connected to both sides of the outer surface of the bidirectional screw rod (29); and rubber pads (31) are fixedly mounted on opposite surfaces of the two clamping plates (30).

10. The manufacturing device of the composite skirt of the engine casing according to claim 9, characterized in that: The length of the two rubber pads (31) is the same as the length of the clamping plate (30), and the opposing surfaces of the two rubber pads (31) are both arc-shaped.

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