CN114871704A - Method for processing closed cover part with multiple reinforcing ribs - Google Patents
Method for processing closed cover part with multiple reinforcing ribs Download PDFInfo
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- CN114871704A CN114871704A CN202210616741.7A CN202210616741A CN114871704A CN 114871704 A CN114871704 A CN 114871704A CN 202210616741 A CN202210616741 A CN 202210616741A CN 114871704 A CN114871704 A CN 114871704A
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- tire body
- drill jig
- drill
- forming
- upper die
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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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- 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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/01—Aircraft parts
Abstract
The invention provides a method for processing a closed opening cover part with a plurality of reinforcing ribs, and belongs to the technical field of aviation sheet metal part manufacturing. The method solves the problem of forming multi-bent-edge web plate reinforcing rib sheet metal parts with different thicknesses, avoids tolerance accumulation caused by multiple positioning, fundamentally solves the problems that the depth of the reinforcing rib of the closed cover part meets the digital-analog requirement, the surface quality is smooth and transitional, the tolerance of the appearance of the part in a natural state is less than or equal to 0.5mm, and the precision of the hole positions of holes around all the reinforcing ribs is +/-0.2 mm.
Description
Technical Field
The invention belongs to the technical field of aviation sheet metal part manufacturing, and relates to a method for processing a closed opening cover part with a plurality of reinforcing ribs.
Background
In the manufacturing of various structural members of the airplane, the technological process of the closed opening cover part is particularly complex, especially in the design of the modern large airplane, the surface quality and the manufacturing precision of the closed opening cover part are high, the contour of a curved surface is complex, the geometric dimension is varied, the manufacturing process is very difficult, the closed opening cover part with a plurality of reinforcing ribs is arranged on the curved surface, the appearance structure of the closed opening cover part is characterized in that the closed opening cover part is box-shaped, the peripheral bent edges are different in height, the three-side bent edges are also provided with small hooked edges and sunken parts, the box-shaped curved surface is fully provided with holes, the diameter range of the holes is phi 25-phi 87, and the specifications of the reinforcing ribs on the curved surface are different. The box-shaped part made of 0.8mm ultrathin materials has large deformation due to the release of the internal stress of the materials after heat treatment, and the surface of the part has a bulge phenomenon; in the hydraulic process, the material plastic deformation and the rib structure of the strip lead to insufficient height of the bent edge of the part, even the height difference of the maximum position is 3-4 mm, the reinforcing rib is seriously creased or cracked densely, and the height of the reinforcing rib is not in accordance with the design requirement. Based on the method, the processing method suitable for the parts such as the closed cover is explored, the special tool suitable for forming the parts is designed, the defects of out-of-shape dimension, large resilience of bending angle and forming of surface reinforcing ribs are overcome, a one-step forming method is adopted to replace a common hydraulic forming process method, the accurate manufacturing of the parts is completed, and the processing method of the parts such as the closed cover made of the thin aluminum alloy material and provided with the bent edge, the sunken part and the reinforcing ribs is provided.
Disclosure of Invention
In order to meet the requirement for accurately manufacturing the aluminum alloy parts of the sealing opening cover, the invention provides a method for processing the parts of the sealing opening cover with a plurality of reinforcing ribs, and the accurate manufacturing of the parts of the sealing opening cover with the bending edge height, the sinking depth and the height of the reinforcing ribs meeting the design requirements is realized. The processing method can be used for manufacturing closed cover type aluminum alloy parts with various thicknesses, different bending angles and multiple reinforcing ribs. Take a typical 0.8mm thin aluminum alloy material, four bent edges, and a closed flap part with four reinforcing ribs on the curved surface as an example.
The technical scheme of the invention is as follows:
a method for processing a part such as a closed opening cover with a plurality of reinforcing ribs comprises one-step forming, hydraulic forming and brake-pressing forming. The tool designed by the processing method comprises the following steps: a belt drilling mould tire and a belt pressing mould tire; the mold with the drill is used for one-step forming, a plurality of reinforcing ribs are formed and processed on a plate material through one-step forming, the fillet and the depth of the formed reinforcing ribs are consistent with those of a digital model, the surface quality is smooth and transitional, and no wrinkles or waviness exist; drilling a high-precision positioning hole with the diameter phi of 6.35mm at 3 positions through a drilling template with a drilling template tire after the reinforcing rib is formed; the belt profiling tire is used for manufacturing the peripheral bent edge of a part and the bent edge sinking, the angle of the bent edge formed by hydraulic forming meets the requirements of 90 +/-5 degrees and 90 +/-2 degrees, and the sinking depth meets 1.02 +/-0.5 mm.
The mould tire with the drill jig comprises a lower mould 1, an upper mould 2 with the drill jig, a drill bushing 3, a positioning pin 4, an M10 lifting ring screw 5 and an M16 lifting ring screw 6. Wherein, the lower die 1 adopts A3 carbon structural steel, the structural dimension is 860 multiplied by 750 multiplied by 35mm, and the lower die is in a rectangular structure; the upper die 2 with the drill jig and the lower die 1 are made of the same material, the structural size is 860 multiplied by 750 multiplied by 27mm, and the two are connected and integrated through a positioning pin 4. The positioning pin 4 is standard 1AM-6, the diameter is phi 10mm, and the length is 15 mm; the positioning pin 4 is fixed on the lower die 1, the depth of the positioning pin in the base body of the lower die 1 is 9mm, and an avoiding hole is formed in the position, corresponding to the upper die 2, with the drill jig. The upper die 2 with the drill jig is provided with 3 drill bushings 3; the drill bushing 3 is selected from standard HB394-1987, the material specification is 6.35F8-18, and the central axis of the drill bushing 3 is consistent with a central hole with the diameter phi of 6.35mm at the position 3 on a part digifax. The number of the M10 lifting ring screws 5 is 4, the standard is GB/T825, and the M10 lifting ring screws are installed on four corners of the upper die 2 with the drill jig and are used for lifting the upper die with the drill jig. The number of the M16 lifting ring screws 6 is 4, the standard is GB/T825, and the M16 lifting ring screws are arranged at four corners of the lower die 1 and are used for lifting the whole lower die or the die tire with the drill.
The belt press type tyre comprises a tyre body 7, a cover plate 8, a movable block 9 and a special tool pin 10. The material of the tire body 7 is A3 carbon structural steel, and the tire body is of a rectangular structure, and is 630mm long, 580mm wide and 70mm thick; the surface of the tire body 7 is processed according to digital control of a part digital model, the surface of the whole is in smooth transition, the lowest end of the corresponding position of each reinforcing rib on the tire body 7 is provided with a groove, the inside of each groove is uniformly drilled with 3 exhaust holes with the diameter phi of 8mm, each exhaust hole penetrates through the whole tire body 7, and the purpose is to prevent the reinforcing rib from not exhausting in hydraulic forming, so that the material is not attached to the surface of the tire body 7, wrinkles are generated, and the trimming is not easy. The three-edge bent edge of the tire body 7 is wide at the upper part and narrow at the lower part, and is manufactured to be hidden, so that the bent edge is convenient to form. The length and width dimensions of the cover plate 8 are the same as those of the carcass 7, and the thickness is 20 mm. The cover plate 8 and the tire body 7 are connected by using 2 positioning pins with the diameter phi 10mm, because the part has three bent edges, the 2 positioning pins with the diameter phi 10mm can only select the edges on the same side, and the standard, the material and the function of the 2 positioning pins with the diameter phi 10mm are the same as those of the positioning pins 4. The movable block 9 is a part of the tire body 7, the size is 70 multiplied by 11 multiplied by 8mm, and the movable block 9 is used for facilitating the extraction of parts from the tire body 7 after the 3-position crimping parts are hydroformed. The special tool pins 10 are standard 1AM-17, 3 in number, 5mm in diameter and 25mm in height, and are used for positioning parts and the tire body 7 in the hydraulic forming process.
The invention has the beneficial effects that: the combined machining method of the closed opening cover part with the plurality of reinforcing ribs solves the problem of forming multi-bent-edge web reinforcing rib sheet metal parts with different thicknesses, avoids tolerance accumulation caused by multiple positioning, fundamentally solves the problem that the depth of the reinforcing ribs of the closed opening cover part meets the digital-analog requirement, the surface quality is smooth and transitional, the tolerance of the appearance of the part in a natural state is less than or equal to 0.5mm, and the precision of hole positions of holes around all the reinforcing ribs is +/-0.2 mm.
Drawings
FIG. 1 is a front view of a tire with a drill model designed according to the present invention.
FIG. 2 is a side view of a tire with a drill pattern designed according to the present invention.
FIG. 3 is a cross-sectional view taken along line A-A of the tire with a drill jig according to the present invention.
Fig. 4 is a front view of a belt press type tire according to the present invention.
FIG. 5 is a sectional view of a belt-type tire according to the present invention, wherein (a) is a sectional view taken along A-A, and (B) is a sectional view taken along B-B.
In the figure: 1, lower die; 2, an upper die with a drill jig; 3, drilling a sleeve; 4, positioning pins; 5M10 eye screw; 6M16 eye screw; 7, a tyre body; 8, covering a plate; 9, a movable block; 10 special tool pins.
Detailed Description
The following examples and drawings are included to further illustrate the embodiments of the present invention and are not intended to limit the invention thereto.
According to the processing process flow of the closed flap parts with a plurality of reinforcing ribs, taking a 0.8mm ultrathin flap part with 3 bent edges and 4 reinforcing ribs as an example, the processing method comprises the following steps:
the first step is as follows: the surface quality of the 0.8mm sheet is inspected and is required to be smooth, not allowing visible cracks, splits, scratches, delaminations, non-metallic inclusions, bubbles, burning, corrosion spots, delamination, residual scale, scars, metallic and non-metallic inclusions, roll marks in the form of indentations and protrusions and other surface defects having a depth not exceeding the negative thickness deviation.
The second step is that: the distance between the back baffle plate of the plate shearing machine and the edge of the lower shear is adjusted according to the width of the cut strip. According to the fiber direction of the material, the plate is fed along the length direction or the width direction, and the plate is required to be blanked: 782 (fiber direction) × 663 mm. Starting the equipment, stepping on a switch of the plate shearing machine, moving the presser foot downwards until the presser foot presses on the plate, then moving the upper scissors downwards to be crossed with the lower scissors, and after finishing primary shearing, moving the upper scissors and the presser foot upwards to return to the initial position.
The third step: and (4) filing the single-piece rough material, and filing and grinding the edge of the part by using a file and removing burrs. Care should be taken to avoid scratching adjacent surfaces or excessive material removal while deburring is being performed. All edges must not be cracked and must be ground to above Ra6.3 within specified tolerances. And cleaning the surface of the part by using acetone (GB/T686) or butanone (Q/SHX010) or ethanol (GB/T394).
The fourth step: and (3) carrying out solution heat treatment on the wool, wherein the temperature and time of the solution treatment are determined according to the characteristics and the thickness of the material, the discharging time of the solution treatment is recorded, the wool after being discharged needs to be put into a refrigerator for cold storage treatment, the state of the wool is kept unchanged, and the wool is better formed. Parts discharged from the furnace need to be leveled and trimmed to reach the flat state of the blank plates.
The fifth step: and selecting a proper hydraulic machine model according to the shape of the part and the structure of the tool, and checking the integrity, safety and reliability of the equipment. Lifting the upper die 2 with the drill jig by using all M10 lifting ring screws 5 of the crane lifting hook, positioning and fixing the deburred rough materials on the lower die 1 through pin holes, covering the upper die 2 with the drill jig, moving all M16 lifting ring screws 6 of the crane lifting hook to a hydraulic press, and taking down all M10 lifting ring screws 5 and M16 lifting ring screws 6. And starting the hydraulic machine, enabling the mould with the drill jig to enter a working area of the hydraulic machine along with the workbench, and performing hydraulic pressure according to a set pressure value. And after hydraulic pressure is finished, pushing out the workbench, using a crane to hoist the jig with the drill and the semi-finished part together, and finishing the one-step forming.
And a sixth step: wearing goggles, and vertically drilling a positioning hole with the diameter phi of 6.35mm at the position 3 on the upper die 2 with the drilling jig by using a special pneumatic drill; and after the positioning hole is drilled, taking down the upper die 2 with the drill jig and the semi-finished part.
The seventh step: and milling all holes and edges on the surface of the semi-finished part according to the programmed numerical control program, and deburring the milled semi-finished part. Hoisting a cover plate 8 of the belt press type tire, and placing the semi-finished parts formed by the one-step method on the upper surface of the tire body 7 according to the positioning requirement; mounting 4 mushroom-shaped positioning pins, closing the cover plate 8, and performing hydroforming three bending edges and sinking according to the operation sequence of the fifth step; and (4) taking out the movable block 9 after forming, then taking out the part, and finishing the hydraulic forming.
Eighth step: the gate is pressed and formed, the end of the part is positioned by the bending edge, and the general R2 knife gate is used for pressing the small bending edge. And (5) finishing the brake pressure forming.
Claims (6)
1. A processing method of a closed opening cover part with a plurality of reinforcing ribs is characterized by comprising the following steps:
the first step is as follows: inspecting the surface quality of the plate, wherein the surface is required to be smooth, no visible cracks, scratches, delaminations, non-metallic inclusions, bubbles, burning loss, corrosion spots, delamination, residual oxide scale, scars, metallic and non-metallic inclusions are allowed, roll marks in the form of indentations and protrusions are allowed, and surface defects with the depth not exceeding the thickness negative deviation are allowed;
the second step is that: adjusting the distance between a rear baffle plate of the plate shearing machine and the cutting edge of the lower shear according to the width of the cut strip material; feeding the plate material along the length direction or the width direction according to the fiber direction of the material, and blanking the plate material according to the requirement; starting the equipment, stepping down a switch of the plate shearing machine, moving a pressure foot downwards until the pressure foot presses on a plate material, then moving an upper scissors downwards to be crossed with a lower scissors, and after finishing primary shearing, moving the upper scissors and the pressure foot upwards to return to an initial position;
the third step: filing the single rough material, filing and polishing the edge of the part by using a file, removing burrs, and cleaning the surface of the part;
the fourth step: carrying out solution heat treatment on the wool, wherein the temperature and time of the solution treatment are determined according to the characteristics and the thickness of the material, and recording the discharging time of the solution treatment; leveling and finishing the parts discharged out of the furnace to achieve a flat state of the blank plate;
the fifth step: one-step forming by using a mould with a drill
The mould with the drill jig comprises a lower mould (1), an upper mould (2) with the drill jig, a drill bushing (3), a positioning pin (4) and a lifting bolt; wherein, the lower die (1) is in a rectangular structure; the positioning pin (4) is fixed on the lower die (1), and a hiding hole is formed in the corresponding position of the upper die (2) with the drill jig; the upper die (2) with the drill jig is connected and integrated with the lower die (1) through a positioning pin (4); the upper die (2) with the drill jig is provided with 3 drill bushings (3); the central axis of the drill bushing (3) is consistent with a central hole with the diameter phi of 6.35mm at the position 3 on the part digifax; lifting ring screws are arranged at four corners of the lower die (1) and the upper die (2) with the drill jig and are used for carrying and hoisting;
during forming, the upper die (2) with the drill jig is lifted, the deburred blank is positioned and fixed on the lower die (1) through the pin hole, and the upper die (2) with the drill jig is covered; moving the whole mould with the drill jig to a hydraulic press, and taking down all lifting ring screws; starting the hydraulic machine, enabling the mould with the drill jig to enter a working area of the hydraulic machine along with the workbench, and performing hydraulic pressure according to a set pressure value; after hydraulic pressure is finished, the workbench is pushed out, the jig with the drill jig and the semi-finished parts are hoisted together, and one-step forming is finished;
and a sixth step: vertically drilling a positioning hole with the diameter phi of 6.35mm at the position 3 on an upper die (2) with a drill jig; after the positioning hole is drilled, taking down the upper die (2) with the drill jig and the semi-finished part;
the seventh step: hydroforming with belt press type tire
The belt press type tire comprises a tire body (7), a cover plate (8), a movable block (9) and a special tool pin (10); the tire body (7) is of a rectangular structure, the surface of the tire body is processed according to digital control of parts, the surface of the whole tire body is in smooth transition, the lowest end of the tire body (7) corresponding to each reinforcing rib is provided with a groove, exhaust holes are uniformly drilled in each groove, each exhaust hole penetrates through the whole tire body (7), and the reinforcing ribs are prevented from not exhausting in hydraulic forming, so that the material is not attached to the surface of the tire body, wrinkles are generated, and the tire body is not easy to trim; the three-edge bent edge of the tire body (7) is wide at the upper part and narrow at the lower part, and is manufactured to be hidden, so that the bent edge is convenient to form; the cover plate (8) is connected with the tire body (7) by using a positioning pin; the movable block (9) is a part of the tire body (7), so that the parts can be conveniently extracted from the tire body after the beading parts are hydroformed; the special tool pin (10) is used for positioning the part and the tire body (7) in the hydraulic forming process;
when forming, firstly milling all openings and edges on the surface of the semi-finished part, and deburring the milled semi-finished part; then, hoisting a cover plate (8) of the belt-press type tire, and placing the semi-finished parts formed by the one-step method on the upper surface of the tire body (7) according to the positioning requirement; installing a positioning pin, closing the cover plate (8), and performing hydroforming on three bent edges and sinking according to the operation sequence of the fifth step; after forming, the movable block (9) is taken out, then the part is taken out, and the hydraulic forming is finished;
eighth step: and (4) gate pressing forming, namely positioning by using the bent edge end of the part, and gate pressing the small bent edge by using a gate knife, thus finishing gate pressing forming.
2. The process according to claim 1, characterized in that in said third step, deburring is carried out avoiding scratching the adjacent surfaces or excessive removal of material; all edges are not allowed to crack and are ground above Ra6.3 within specified tolerances.
3. The machining method according to claim 1 or 2, characterized in that the lower die (1) and the upper die (2) with the drill jig are both made of A3 carbon structural steel; the structure size of the lower die (1) is 860 multiplied by 750 multiplied by 35mm, and the structure size of the upper die (2) with the drill jig is 860 multiplied by 750 multiplied by 27 mm.
4. The machining method according to claim 1 or 2, characterized in that the depth of the locating pin (4) in the base of the lower die (1) is 9 mm.
5. Machining method according to claim 3, characterized in that the depth of the positioning pin (4) in the base of the lower die (1) is 9 mm.
6. The process according to claim 1, 2 or 5, characterized in that the carcass (7) is made of A3 carbon structural steel, 630mm long, 580mm wide and 70mm thick; the length and width of the cover plate (8) are the same as those of the tire body (7), and the thickness is 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210616741.7A CN114871704B (en) | 2022-06-01 | 2022-06-01 | Processing method of sealing flap parts with multiple reinforcing ribs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210616741.7A CN114871704B (en) | 2022-06-01 | 2022-06-01 | Processing method of sealing flap parts with multiple reinforcing ribs |
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| Publication Number | Publication Date |
|---|---|
| CN114871704A true CN114871704A (en) | 2022-08-09 |
| CN114871704B CN114871704B (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210616741.7A Active CN114871704B (en) | 2022-06-01 | 2022-06-01 | Processing method of sealing flap parts with multiple reinforcing ribs |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005186137A (en) * | 2003-12-26 | 2005-07-14 | Toyo Tire & Rubber Co Ltd | Press forming method |
| CN103846624A (en) * | 2013-12-30 | 2014-06-11 | 贵州遵义驰宇精密机电制造有限公司 | Machining technology of elongated thin-wall C-shaped tubular parts |
| CN214866410U (en) * | 2021-06-11 | 2021-11-26 | 江西洪都航空工业集团有限责任公司 | Ultra-thin aluminum alloy aircraft skin forming process device with reinforcing rib grooves |
| CN114248067A (en) * | 2021-11-15 | 2022-03-29 | 航天科工哈尔滨风华有限公司 | Method for processing high-hardness thin-wall stainless steel plate type control surface |
-
2022
- 2022-06-01 CN CN202210616741.7A patent/CN114871704B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005186137A (en) * | 2003-12-26 | 2005-07-14 | Toyo Tire & Rubber Co Ltd | Press forming method |
| CN103846624A (en) * | 2013-12-30 | 2014-06-11 | 贵州遵义驰宇精密机电制造有限公司 | Machining technology of elongated thin-wall C-shaped tubular parts |
| CN214866410U (en) * | 2021-06-11 | 2021-11-26 | 江西洪都航空工业集团有限责任公司 | Ultra-thin aluminum alloy aircraft skin forming process device with reinforcing rib grooves |
| CN114248067A (en) * | 2021-11-15 | 2022-03-29 | 航天科工哈尔滨风华有限公司 | Method for processing high-hardness thin-wall stainless steel plate type control surface |
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| CN114871704B (en) | 2023-06-27 |
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