CN219853432U - Device for secondary positioning after chemical milling of aircraft skin - Google Patents
Device for secondary positioning after chemical milling of aircraft skin Download PDFInfo
- Publication number
- CN219853432U CN219853432U CN202320719933.0U CN202320719933U CN219853432U CN 219853432 U CN219853432 U CN 219853432U CN 202320719933 U CN202320719933 U CN 202320719933U CN 219853432 U CN219853432 U CN 219853432U
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- China
- Prior art keywords
- positioning
- drill jig
- milling
- chemical milling
- positioning holes
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- 238000003801 milling Methods 0.000 title claims abstract description 69
- 238000007789 sealing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Drilling And Boring (AREA)
Abstract
The utility model discloses a device for secondary positioning after chemical milling of an aircraft skin. Comprises a base (1), wherein a cross flat groove (2) and a vertical groove (3) are sunk inwards on one side surface of the base (1), and the vertical groove (3) penetrates through the top and bottom surfaces of the base (1); the top surface of the base (1) is provided with a chemically milling rear positioning hole (4) and a chemically milling front positioning hole (5) along the sinking direction of the vertical groove (3); the front positioning holes and the rear positioning holes of the chemical milling are arranged in pairs and are uniformly arranged on two sides of the vertical groove (3); the horizontal groove (2) is connected with a drill jig sliding plate (6) in a sliding mode, the drill jig sliding plate (6) is provided with a drill jig (7), the drill jig (7) is connected with the vertical groove (3) in a sliding mode, the drill jig sliding plate (6) is also provided with drill jig positioning holes (8), the drill jig positioning holes (8) are arranged in pairs, and the drill jig positioning holes can be aligned with the positioning holes before/after chemical milling when the drill jig sliding plate (6) is used. The utility model can simplify the secondary positioning process after the chemical milling of the skin, improve the production efficiency and reduce the rejection rate.
Description
Technical Field
The utility model relates to the technical field of aircraft assembly and manufacturing by aviation technology, in particular to a device for secondary positioning after chemical milling of an aircraft skin.
Background
As shown in fig. 1, the part is a chemically milled skin of a certain airplane, and has the following characteristics: 1. the size is large; 2. the appearance is complex, and the curvature change is irregular; 3. and the chemical milling area and the thickness are uneven, and multiple chemical milling is needed.
According to the prior art, the current production flow of the parts is generally as follows: (1) stretch forming, (2) preparing a chemically milling positioning hole according to a die, and (3) chemically milling, and (4) cutting and trimming the shape according to the die. Wherein the device adopted in the step (2) is shown in fig. 2, wherein: the die mould is provided with 1 pair of drill bushing and 2 positioning holes, the drill plate is provided with 1 pair of drill bushing and 2 positioning holes (matched positioning pins), and when the drill plate is aligned with the die mould, the positioning holes and the drill bushing are in one-to-one correspondence and coaxial. Because the drilling jig, the locating pin and the hole in the die and the drilling template cannot move, the part chemical milling deformation is not considered, in the step (4), dislocation occurs between the part locating hole and the die locating hole due to chemical milling, and the part is located: the fixture is used for projecting the milling area, leading wires to the inner surface of the part, and carrying out multi-wheel comparison on the milling area and the edge size of the part by measuring the milling area, so that the position of the part is determined, the positioning workload is large, and the positioning accuracy of the part is poor and the processing is difficult due to manual measurement.
With the development of aircraft technology, the chemical milling proportion of the aircraft skin is gradually increased, and the problem of secondary positioning after chemical milling is more urgent.
Disclosure of Invention
The purpose of the utility model is that: a device for the secondary positioning of an aircraft skin after chemical milling is provided. The utility model can simplify the secondary positioning process after the chemical milling of the skin, improve the production efficiency and reduce the rejection rate.
The technical scheme of the utility model is as follows: the device for the secondary positioning of the aircraft skin after chemical milling comprises a base, wherein a cross flat groove and a cross vertical groove are sunk inwards on one side surface of the base, and the vertical groove penetrates through the top surface and the bottom surface of the base; the top surface of the base is provided with a positioning hole after chemical milling and a positioning hole before chemical milling along the sinking direction of the vertical groove; the front positioning holes and the rear positioning holes of the chemical milling are arranged in pairs and are uniformly arranged on two sides of the vertical groove; the horizontal groove sliding connection has the jig slide, is equipped with the jig on the jig slide, jig and vertical groove sliding connection still are equipped with the jig locating hole on the jig slide, the jig locating hole sets up in pairs, and can align with before the chemical milling/back locating hole when the jig slide.
In the device for carrying out secondary positioning after chemical milling on the aircraft skin, the end face of the flat groove is provided with the rear sealing plate.
In the device for carrying out secondary positioning on the aircraft skin after chemical milling, the rear sealing plate is provided with the support arm which is inserted into the vertical groove.
In the device for carrying out secondary positioning after chemical milling on the aircraft skin, the rear sealing plate is fixed on the end face of the flat groove through the fastening screw.
In the device for the secondary positioning of the aircraft skin after chemical milling, the drill jig is embedded with the drill sleeve.
In the device for the secondary positioning of the aircraft skin after chemical milling, the positioning pin is inserted into the positioning hole before/after chemical milling.
Advantageous effects
According to the method, the part curvature and the chemical milling thickness are measured and obtained, the chemical milling deformation of each positioning hole of the part is calculated, and the secondary positioning precision of the part after chemical milling can be greatly improved by adopting the pre-buried positioning device, so that the part machining precision is improved; compared with the prior art, the positioning process after the part chemical milling is simplified, the production efficiency is improved, and the rejection rate is reduced.
Drawings
FIG. 1 is a schematic illustration of typical parts;
FIG. 2 is a schematic illustration of a prior art part pilot hole drilling;
FIG. 3 is a schematic diagram of the deflection of a locating hole during the milling of a part;
FIG. 4 is a schematic diagram of the position of a locating hole before the part is chemically milled;
FIG. 5 is a schematic illustration of a locating hole position after part chemical milling;
FIG. 6 is a schematic diagram of the present apparatus;
FIG. 7 is an exploded view of the present device;
FIG. 8 is a detailed view of the base;
FIG. 9 is a detail view of the jig slide;
fig. 10 is a detailed view of the tooling embedded part.
Wherein: the drilling machine comprises a base, a flat groove, a 3-vertical groove, a 4-chemically-milled locating hole, a 5-chemically-milled front locating hole, a 6-drilling jig sliding plate, a 7-drilling jig, an 8-drilling jig locating hole, a 9-rear sealing plate, a 10-support arm, 11-fastening screws, 12-drilling sleeves, 13-locating pins and 14-drilling jigs.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.
Example 1. As shown in fig. 6, the utility model provides a device for positioning a part of an aircraft skin after chemical milling, which is used for measuring, calculating and testing the offset of a positioning hole after chemical milling based on the degree of curvature and the chemical milling thickness of the part of the skin, and positioning by adjusting the position of the positioning hole of the device.
As shown in a of fig. 3, the joint surface of the part and the mold is A, the arc radius R of the part joint surface and the center line included angle Z of the positioning holes at two sides of the part.
The distance L between the positioning holes on two sides of the part along the curved surface of the part is as follows:
l= ((pi/360) Z) R2 (formula 1)
For the change of the part before and after the differential milling, the parameters of the part before chemical milling are set as follows: a1 R1, L1, Z1; the corresponding parameters of the parts after chemical milling are set as follows: a2 R2, L2, Z2; then:
l1= ((pi/360) ×z1) ×r1×2 (formula 2)
L2= ((pi/360) Z2) R2 (formula 3)
As shown in b in fig. 3, the joint surfaces of the part before and after chemical milling and the die are A1 and A2, and the circular arc radiuses R1 and R2 are related;
r2=r1+c (4)
Z1=z2 (5)
According to (formula 4), (formula 5) and (formula 3), the following can be derived:
l2= ((pi/360) Z1) (r1+c) 2 (formula 6)
Obtained from (formula 6): when C is larger, the difference value between L2 and L1 is larger, and the change of the curved surface distance of the part with the positioning holes on two sides after the part is chemically milled is larger; because the die positioning hole is fixed and unchanged, after the part is chemically milled, when the part is repositioned and trimmed on the die, the part positioning hole is offset relative to the die positioning hole and cannot be used, and the correction of the chemical milling deformation, the trimming difficulty and the workload are increased.
As shown in FIG. 4, the section of the locating hole before the part is chemically milled in FIG. 1, and the part and the tool locating hole are coaxial; as shown in FIG. 5, the section of the locating hole before the part is chemically milled in FIG. 1, and the locating hole of the part and the locating hole of the tool are dislocated at the moment.
Based on the principle, the utility model provides a chemical milling skin positioning device, which is shown in figures 6-10, and comprises a base 1, wherein a cross flat groove 2 and a cross vertical groove 3 are sunk inwards on one side surface of the base 1, and the vertical groove 3 penetrates through the top surface and the bottom surface of the base 1; the top surface of the base 1 is provided with a chemically milling rear positioning hole 4 and a chemically milling front positioning hole 5 along the sinking direction of the vertical groove 3; the front positioning hole and the rear positioning hole of the chemical milling are arranged in pairs and are uniformly arranged on two sides of the vertical groove 3; the horizontal groove 2 is connected with a drill jig sliding plate 6 in a sliding mode, the drill jig sliding plate 6 is provided with a drill jig 7, the drill jig 7 is connected with the vertical groove 3 in a sliding mode, the drill jig sliding plate 6 is also provided with drill jig positioning holes 8, and the drill jig positioning holes 8 are arranged in pairs and can be aligned with positioning holes before/after chemical milling when the drill jig sliding plate 6 is used.
The end face of the flat groove 2 is provided with a rear sealing plate 9.
The aforementioned rear sealing plate 9 is provided with a support arm 10, and the support arm 10 is inserted into the vertical groove 3.
The rear seal plate 9 is fixed to the end face of the flat groove 2 by a fastening screw 11.
The drill jig 7 is embedded with a drill bushing 12.
The positioning pin 13 is inserted into the front/rear positioning holes of the chemical milling machine.
Before chemical milling, the drilling jig sliding plate 6 is slid to a designated position, so that the drilling jig positioning hole 8 on the drilling jig sliding plate is concentric with the positioning holes of the positioning hole 5 and the drilling jig plate 14 before chemical milling of the base, and the positioning hole of the part is drilled after the drilling jig sliding plate is fixed by the positioning pin 13; after chemical milling, the drilling jig sliding plate 6 slides to enable the drilling jig positioning hole 8 on the drilling jig sliding plate to be concentric with the chemical milling rear positioning hole 4 of the base, and after positioning by the positioning pin 13, the part is fixed for subsequent processing.
Claims (6)
1. The device for the secondary positioning of the aircraft skin after chemical milling is characterized by comprising a base (1), wherein a cross flat groove (2) and a vertical groove (3) are formed in one side surface of the base (1) in an inward sinking manner, and the vertical groove (3) penetrates through the top and bottom surfaces of the base (1); the top surface of the base (1) is provided with a chemically milling rear positioning hole (4) and a chemically milling front positioning hole (5) along the sinking direction of the vertical groove (3); the front positioning holes and the rear positioning holes of the chemical milling are arranged in pairs and are uniformly arranged on two sides of the vertical groove (3); the horizontal groove (2) is connected with a drill jig sliding plate (6) in a sliding mode, the drill jig sliding plate (6) is provided with a drill jig (7), the drill jig (7) is connected with the vertical groove (3) in a sliding mode, the drill jig sliding plate (6) is also provided with drill jig positioning holes (8), the drill jig positioning holes (8) are arranged in pairs, and the drill jig positioning holes can be aligned with the positioning holes before/after chemical milling when the drill jig sliding plate (6) is used.
2. The device for the post-chemical milling secondary positioning of an aircraft skin according to claim 1, characterized in that the end face of the flat groove (2) is provided with a rear sealing plate (9).
3. The device for the post-milling secondary positioning of an aircraft skin according to claim 2, characterized in that the rear sealing plate (9) is provided with a support arm (10), and the support arm (10) is inserted into the vertical groove (3).
4. Device for the post-milling secondary positioning of an aircraft skin according to claim 2, characterized in that the rear closing plate (9) is fixed to the end face of the flat groove (2) by means of fastening screws (11).
5. The device for the post-milling secondary positioning of aircraft skin according to claim 1, characterized in that the jig (7) is embedded with a drill bushing (12).
6. Device for post-chemical milling secondary positioning of aircraft skin according to claim 1, characterized in that the pre-chemical milling/post-chemical milling positioning holes are inserted with positioning pins (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320719933.0U CN219853432U (en) | 2023-04-03 | 2023-04-03 | Device for secondary positioning after chemical milling of aircraft skin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320719933.0U CN219853432U (en) | 2023-04-03 | 2023-04-03 | Device for secondary positioning after chemical milling of aircraft skin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219853432U true CN219853432U (en) | 2023-10-20 |
Family
ID=88322588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320719933.0U Active CN219853432U (en) | 2023-04-03 | 2023-04-03 | Device for secondary positioning after chemical milling of aircraft skin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219853432U (en) |
-
2023
- 2023-04-03 CN CN202320719933.0U patent/CN219853432U/en active Active
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