CN110682124A - Milling fixture for fine cutting of large-scale double-curvature aircraft skin - Google Patents

Milling fixture for fine cutting of large-scale double-curvature aircraft skin Download PDF

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Publication number
CN110682124A
CN110682124A CN201910868187.XA CN201910868187A CN110682124A CN 110682124 A CN110682124 A CN 110682124A CN 201910868187 A CN201910868187 A CN 201910868187A CN 110682124 A CN110682124 A CN 110682124A
Authority
CN
China
Prior art keywords
positioning
aircraft skin
clamping plate
component
auxiliary clamping
Prior art date
Application number
CN201910868187.XA
Other languages
Chinese (zh)
Inventor
王宏明
郝元媛
黄蓉
韩波
王波
卢文权
刘新建
李翀
曹富营
全力
李许飞
Original Assignee
陕西飞机工业(集团)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 陕西飞机工业(集团)有限公司 filed Critical 陕西飞机工业(集团)有限公司
Priority to CN201910868187.XA priority Critical patent/CN110682124A/en
Publication of CN110682124A publication Critical patent/CN110682124A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C3/00Milling particular work; Special milling operations; Machines therefor
    • B23C3/12Trimming or finishing edges, e.g. deburring welded corners
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • B23Q3/062Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • B23Q3/062Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • B23Q3/065Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64FGROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/10Manufacturing or assembling aircraft, e.g. jigs therefor

Abstract

The invention discloses a milling clamp for fine cutting of large-scale double-curvature aircraft skin, which comprises a positioning adsorption component (2), an auxiliary clamping plate positioning component and a basic platform (7). The positioning adsorption component (2) is fixed on the base platform (7), the molded surface of the positioning adsorption component is consistent with that of the aircraft skin, and an air exhaust groove is formed in the molded surface. Supplementary cardboard locating component includes supplementary cardboard (3) and positioning seat (8), and positioning seat (8) are fixed on basic platform (7) in location adsorption component (2) inboard, and supplementary cardboard (3) are fixed on positioning seat (8). The positioning adsorption component (2) and the auxiliary clamping plate (3) are jointed with the aircraft skin together. And a joint (5) which is connected with a vacuum pump and used for vacuumizing the formed cavity is arranged on the basic platform (7). The milling fixture disclosed by the invention adopts full vacuum adsorption, so that the aircraft skin and the milling fixture are tightly pressed, the displacement is not easy to generate, the fine cutting quality is ensured, and the allowance-free precise shape cutting can be realized.

Description

Milling fixture for fine cutting of large-scale double-curvature aircraft skin

Technical Field

The invention belongs to technical equipment for machining, and relates to a milling fixture for fine cutting of large-scale double-curvature aircraft skin.

Background

At present, the problems that the processing technology is difficult, the manufacturability is complex, the edge cutting is carried out manually and the like generally exist in the skin of a large double-curvature airplane. When manual trimming is carried out on the skin of a large-scale double-curvature aircraft, the error of the manual trimming is usually large, a mode of allowance-remaining assembly filing is adopted in the aircraft assembly process, a large amount of filing work needs to be carried out, allowance-free assembly riveting cannot be realized at all, and therefore the production progress of the aircraft is seriously influenced, and therefore the processing technology of the existing skin needs to be redefined and designed.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide a milling fixture for fine cutting of a large double-curvature aircraft skin, so as to meet the requirement of allowance-free processing of large double-curvature aircraft skin parts and improve the production efficiency.

The above object of the present invention is achieved by the following technical solutions:

a milling fixture for fine cutting of large-scale double-curvature aircraft skin comprises a positioning adsorption component, an auxiliary clamping plate positioning component and a basic platform, wherein the molded surface of the positioning and adsorbing component is consistent with the molded surface of the aircraft skin, an air exhaust groove is arranged on the molded surface of the positioning and adsorbing component, the positioning and adsorbing component is fixed on the basic platform after being provided with a sealing strip, the auxiliary clamping plate positioning component comprises an auxiliary clamping plate and a positioning seat, wherein the positioning seat is positioned at the inner side of the positioning adsorption component and fixed on the basic platform, the auxiliary clamping plate is fixed on the positioning seat, thereby connecting between the positioning adsorption components, the positioning adsorption components and the auxiliary clamping plate are jointed with the aircraft skin together for keeping the appearance of the aircraft skin, the basic platform is provided with a joint connected with a vacuum pump, the vacuum pumping device is used for vacuumizing a cavity formed by the aircraft skin, the positioning adsorption component, the auxiliary clamping plate and the basic platform.

The positioning and adsorbing assembly is composed of a plurality of modularized positioning and adsorbing modules, so that the airplane skin can be quickly clamped and positioned and the cost is reduced through different combinations of the positioning and adsorbing modules aiming at the common airplane skin molded surface.

The milling fixture disclosed by the invention is used for realizing the compaction of the skin and the milling fixture by adopting full vacuum adsorption, is not easy to shift so as to ensure the precision cutting quality, can realize allowance-free precision shape cutting, can realize electromechanical integration by matching with a five-axis numerical control machine tool, and is suitable for the precision shape cutting of various large skins.

Drawings

FIG. 1 is a top view of an aircraft skin part in an embodiment;

FIG. 2 is a front view of the aircraft skin component of FIG. 1;

FIG. 3 is a top view of the milling fixture of the present invention;

FIG. 4 is a front view of the milling fixture after placement and compression of the aircraft skin part of FIG. 1;

fig. 5 is a sectional view taken along line a-a in fig. 4.

The aircraft comprises 1-an aircraft skin part, 2-a positioning adsorption module, 3-an auxiliary clamping plate, 4-a sealing strip, 5-a quick-change connector, 6-a set screw, 7-a basic platform and 8-a positioning seat.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

For a clearer understanding of the objects, technical solutions and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

FIG. 1 is a top view of an aircraft skin part in an embodiment; fig. 2 is a front view of the aircraft skin component of fig. 1. As shown in the figure, the aircraft skin part is a large double-curvature aircraft skin, and all opening parts need to be precisely cut. At present, the edge cutting is carried out manually, however, when the manual edge cutting is carried out on the skin of a large-scale double-curvature aircraft, the error of the manual edge cutting is usually large, the mode of assembling and filing with allowance is adopted in the aircraft assembling process, a large amount of filing work is needed, and the assembly riveting without allowance can not be realized at all, so that the production progress of the aircraft is seriously influenced.

Therefore, the invention provides a milling fixture for fine cutting of a large-scale double-curvature aircraft skin. FIG. 3 is a top view of the milling fixture of the present invention; FIG. 4 is a front view of the milling fixture after placement and compression of the aircraft skin part of FIG. 1; and fig. 5 is a sectional view taken along line a-a of fig. 4. As shown in the figure, the milling fixture for finely cutting the large double-curvature aircraft skin comprises a positioning and adsorbing component 2, an auxiliary clamping plate positioning component and a basic platform 7, wherein the positioning and adsorbing component is arranged at a corresponding position according to a part to be accurately cut of a corresponding aircraft skin part 1, and the molded surface is consistent with the molded surface of the corresponding aircraft skin part 1 in a fitting manner. For example, the portion to be precisely cut of the aircraft skin part shown in fig. 1 includes the outer edge of the aircraft skin part with the notch a and the rectangular portion B indicated in the center of the aircraft skin part shown in fig. 1, and since both the left and right sides are straight edges, cutting may be performed in advance so that the arrangement of the positioning suction assembly, as shown in fig. 3, corresponds to the portion to be precisely cut of the aircraft skin part 1. Be provided with the groove of taking out air on the profile of location adsorption component 2, fix on basic platform 7 after location adsorption component 2 installation sealing strip 4, for example, can adopt tacking screw 6 to fix on basic platform 7.

Supplementary cardboard locating component includes supplementary cardboard 3 and positioning seat 8, and wherein positioning seat 8 is inboard at location adsorption component 2, fixes on basic platform 7, and supplementary cardboard 3 is fixed on positioning seat 8 to connect between location adsorption component 2, location adsorption component 2 and supplementary cardboard 3 laminate with aircraft skin part 1 together, are used for fixing a position aircraft skin part 1's appearance. The basic platform is provided with a quick-change connector 5 connected with a vacuum pump, and the quick-change connector is used for vacuumizing an aircraft skin part 1, a positioning adsorption component 2, an auxiliary clamping plate 3, a basic platform 7 and a cavity formed by sealing strips, which are placed on the positioning adsorption component and the auxiliary clamping plate, and an air-pumping groove on a molded surface of the positioning adsorption component 2 communicated with the cavity, so that the aircraft skin part 1 can be fastened on the milling fixture of the invention by utilizing a negative pressure principle generated by the vacuumized atmosphere, then the aircraft skin part 1 can be milled at a high speed, the outer contour error of the aircraft skin part can be controlled within +/-0.05 mm, and the problem of no-allowance assembly of the aircraft skin part can be solved.

In addition, the positioning and adsorbing assembly 2 can be composed of a plurality of modularized positioning and adsorbing modules, so that the airplane skin can be quickly clamped and positioned by different combinations of the positioning and adsorbing modules aiming at the common airplane skin molded surface, and the cost is reduced. For example, for the aircraft skin part 1 shown in fig. 1, the positioning and adsorbing assembly 2 may be composed of a straight-edge positioning and adsorbing module, a positioning and adsorbing module corresponding to the rectangular portion B in the center of the aircraft skin part 1, and a positioning and adsorbing module corresponding to the notch a.

Although various suitable materials can be used, the material for positioning the adsorption member 2 is preferably an aluminum alloy, and more preferably 6061-T651 aluminum alloy, which is excellent in workability, high in toughness, and does not deform after processing, and is easily polished, in view of cost, weight, and the like. In the embodiment, the size of the air-extracting groove on the molded surface of the positioning adsorption component 2 is set to be 6mm wide and 5.5mm deep, which can be adjusted according to the specific situation, and in addition, the precision of the molded surface is +/-0.02 mm. The sealing strip 4 can adopt a phi 6 hollow rubber sealing strip.

The quick-change connector 5 arranged on the basic platform 7 can be any connector capable of being connected with a vacuum pump, the connection and the disassembly are convenient, and the vacuum degree after the vacuum pumping is not lower than 0.08 MPa.

The positioning seat 8 which is positioned at the inner side of the positioning adsorption component 2 and fixed on the base platform 7 can be made of No. 45 steel, the hardness after heat treatment is HRC 35-40, and the precision of the positioning surface is +/-0.02 mm. Similar to the positioning and adsorbing component 2, the auxiliary clamping plate 3 is preferably made of aluminum alloy, and more preferably made of 6061-T651 aluminum alloy, the profile precision of the auxiliary clamping plate is +/-0.02 mm, and the auxiliary clamping plate and the positioning and adsorbing component 2 are used for positioning the appearance of the aircraft skin part 1.

When the milling clamp is used, firstly, the positioning absorption component 2 is provided with the sealing strip 4, then the sealing strip is connected to the base platform 7 through the set screw 6, then the positioning seat 8 is arranged on the inner side of the positioning absorption component 2 and is fixed on the base platform 7, and then the auxiliary clamping plate 3 is fixed on the positioning seat 8. The aircraft skin part 1 is then placed on the positioning suction assembly 2 and the auxiliary card 3. And connecting the quick-change connector 5 on the basic platform 7 with a vacuum pump, and vacuumizing the formed cavity, wherein the vacuum degree is not lower than 0.08MPa, so that the aircraft skin part 1 is tightly adsorbed on the positioning adsorption component 2. After the aircraft skin part is positioned, a five-axis numerical control machine tool is started, and after the cutter is positioned through a positioning hole in the aircraft skin part 1, the aircraft skin part 1 is subjected to accurate trimming according to a numerical control program. And after finishing the accurate trimming work of the aircraft skin part, closing the vacuum pump, and taking out the aircraft skin part 1 with accurate trimming from the positioning adsorption module 2.

The milling fixture for precisely cutting the skin of the large-scale double-curvature aircraft can meet the requirement of no-allowance processing of large-scale skin parts, reduces the cost investment of the tool, saves the placing space of the tool, shortens the development period of the tool, improves the total production efficiency, and has great practical application and popularization values.

Claims (8)

1. A milling fixture for fine cutting of large-scale double-curvature aircraft skin comprises a positioning adsorption component (2), an auxiliary clamping plate positioning component and a basic platform (7), wherein the molded surface of the positioning adsorption component (2) is consistent with the molded surface of the aircraft skin, an air exhaust groove is formed in the molded surface of the positioning adsorption component (2), the positioning adsorption component (2) is fixed on the basic platform (7) after a sealing strip is installed on the positioning adsorption component, the auxiliary clamping plate positioning component comprises an auxiliary clamping plate (3) and a positioning seat (8), the positioning seat (8) is located on the inner side of the positioning adsorption component (2) and fixed on the basic platform (7), the auxiliary clamping plate (3) is fixed on the positioning seat (8) and connected between the positioning adsorption components, the positioning adsorption component (2) and the auxiliary clamping plate (3) are attached to the aircraft skin together for keeping the appearance of the aircraft skin, and a joint (5) connected with a vacuum pump is arranged on the basic platform (7) and is used for vacuumizing a cavity formed by the aircraft skin, the positioning adsorption component (2), the auxiliary clamping plate (3) and the basic platform (7).
2. Milling fixture according to claim 1, wherein the positioning suction assembly (2) is constituted by a plurality of modular positioning suction modules.
3. A milling fixture as defined in claim 1 wherein the vacuum after evacuation is not less than 0.08 MPa.
4. Milling fixture according to claim 1, wherein the material of the positioning and suction assembly (2) is an aluminium alloy.
5. Milling fixture according to claim 4, wherein the material of the positioning and suction assembly (2) is 6061-T651 aluminium alloy.
6. Milling fixture according to claim 1, wherein the material of the auxiliary clamping plate (3) is an aluminum alloy.
7. Milling fixture according to claim 6, wherein the material of the auxiliary clamping plate (3) is 6061-T651 aluminium alloy.
8. Milling fixture according to claim 1, wherein the profile accuracy of the positioning suction assembly (2) and the auxiliary clamping plate (3) is ± 0.02 mm.
CN201910868187.XA 2019-09-12 2019-09-12 Milling fixture for fine cutting of large-scale double-curvature aircraft skin CN110682124A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910868187.XA CN110682124A (en) 2019-09-12 2019-09-12 Milling fixture for fine cutting of large-scale double-curvature aircraft skin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910868187.XA CN110682124A (en) 2019-09-12 2019-09-12 Milling fixture for fine cutting of large-scale double-curvature aircraft skin

Publications (1)

Publication Number Publication Date
CN110682124A true CN110682124A (en) 2020-01-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090322008A1 (en) * 2005-05-20 2009-12-31 The Boeing Company Reconfigurable Workpiece Support Fixture
CN101738154A (en) * 2010-01-21 2010-06-16 西北工业大学 Flexible detection device for aircraft skin
CN103639797A (en) * 2013-11-28 2014-03-19 江西洪都航空工业集团有限责任公司 Double-curvature profile surface vacuum absorption platform and method for machining thickness of double-curvature skin
CN109774194A (en) * 2019-03-29 2019-05-21 四川省新万兴碳纤维复合材料有限公司 A kind of integrally formed tooling of composite material fuselage covering and its moulding process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090322008A1 (en) * 2005-05-20 2009-12-31 The Boeing Company Reconfigurable Workpiece Support Fixture
CN101738154A (en) * 2010-01-21 2010-06-16 西北工业大学 Flexible detection device for aircraft skin
CN103639797A (en) * 2013-11-28 2014-03-19 江西洪都航空工业集团有限责任公司 Double-curvature profile surface vacuum absorption platform and method for machining thickness of double-curvature skin
CN109774194A (en) * 2019-03-29 2019-05-21 四川省新万兴碳纤维复合材料有限公司 A kind of integrally formed tooling of composite material fuselage covering and its moulding process

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