CN109530764B - Sawtooth aircraft skin clamping and numerical control appearance milling method - Google Patents
Sawtooth aircraft skin clamping and numerical control appearance milling method Download PDFInfo
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- CN109530764B CN109530764B CN201811498202.8A CN201811498202A CN109530764B CN 109530764 B CN109530764 B CN 109530764B CN 201811498202 A CN201811498202 A CN 201811498202A CN 109530764 B CN109530764 B CN 109530764B
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- milling
- skin
- movable clamp
- clamping
- numerical control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, 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
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices 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
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
Abstract
The invention relates to a sawtooth type airplane skin clamping and numerical control appearance milling method, belongs to airplane skin clamping and numerical control appearance milling technologies, and belongs to the technical field of aviation manufacturing. The method comprises the following steps: the method comprises the steps of taking down a first movable clamp and a second movable clamp when a skin part is subjected to drawing, shearing a blank after the skin part is drawn, drilling a skin positioning hole, then positioning the skin part on a drawing die, sequentially clamping the skin part by using the first movable clamp and the second movable clamp, carrying out numerical control appearance milling on the skin part on a modified drawing die tool on a numerical control milling machine after clamping, leaving thickness for the skin part without milling in order to prevent vibration after milling of the skin part, taking down the skin part after milling is finished, and trimming by a bench worker.
Description
Technical Field
The invention relates to a sawtooth type airplane skin clamping and numerical control appearance milling method, belongs to airplane skin clamping and numerical control appearance milling technologies, and belongs to the technical field of aviation manufacturing.
Background
The skin part is used as a key part for forming the aerodynamic shape of the airplane, and has the advantages of complex shape, large size range change and small rigidity. The requirements of modern aircraft products on the manufacturing accuracy of sheet metal parts are not only fit, but also are not required to be knocked to form (such as civil aircraft sheet metal parts), and stable shape accuracy, surface quality and performance states are required. Due to the requirement of structural stealth of the next generation military aircraft product in China, the requirement of zigzag skin butt joint further reduces the error control of skin parts, and the allowance-free assembly technology provides high requirements for the manufacturing precision of the skin parts. The digital processing technology has the greatest advantage that the products are processed in the state closest to the ideal state through the transmission of digital quantity, and the processing precision is high. The manufacturing precision of the new-generation airplane parts can be accurately and comprehensively reflected through digital quantity processing, the manufacturing errors can be quantitatively recorded, and scientific basis is provided for further improvement of product performance.
At present, the appearance of the skin is processed by adopting the traditional skin contour, the skin is fixed on a trimming die, a worker manually operates a cutting device to trim according to a sample plate, the working labor intensity is high, the trimming precision is low, the trimming is taken as a key process for manufacturing the skin part, and the processing precision directly influences the subsequent assembly precision. The main problems that the skin is easy to vibrate and the flash cannot be absorbed, the design of milling tools and process parameters is relatively complex, the requirement on process personnel is high, the stability and the production efficiency of the contour processing of skin parts are difficult to ensure due to the lack of corresponding process guide specifications and the like are solved. On the other hand, the design resources of the clamp are not effectively managed, the clamping position depends on personal experience, intensive auxiliary clamp supporting is adopted in practice, the machining quality is guaranteed, the conservative and fussy tooling process greatly reduces the machining efficiency, and therefore the machining cost is improved.
Therefore, in order to improve the assembly efficiency of parts, shorten the production and manufacturing period of the airplane, improve the shape accuracy and the shape and the size of the parts, improve the production working efficiency and meet the manufacturing requirements of the parts of the airplane body. The invention discloses a technology for clamping a sawtooth aircraft skin and milling a numerical control appearance, which is used for solving the problems.
Disclosure of Invention
The invention provides a method for clamping a sawtooth aircraft skin and milling a numerical control appearance aiming at the defects of low milling and trimming precision of parts, high working labor intensity, low efficiency and the like, and aims to adopt a novel numerical control appearance milling technology for solving the problems of flutter and phenomenon in the appearance milling process; on the other hand, the special fixture for designing and manufacturing solves the problems of inaccuracy caused by repeated positioning and error accumulation of parts and the like. The numerical control appearance milling technical specification of the skin parts is formed, and the efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for clamping a sawtooth aircraft skin and milling a numerical control appearance comprises the following steps:
the method comprises the steps of taking down a first movable clamp and a second movable clamp when a skin part is subjected to drawing, shearing a blank after the skin part is drawn, drilling a skin positioning hole, then positioning the skin part on a drawing die, sequentially clamping the skin part by using the first movable clamp and the second movable clamp, carrying out numerical control appearance milling on the skin part on a modified drawing die tool on a numerical control milling machine after clamping, leaving thickness for the skin part without milling in order to prevent vibration after milling of the skin part, taking down the skin part after milling is finished, and trimming by a bench worker.
Further, the milling sequence is as follows:
the method comprises the steps of firstly clamping a skin part by using a first movable clamp, then milling, taking down the first movable clamp after finishing the clamping, then clamping the skin part by using a second movable clamp, then milling until finishing the final milling of the appearance of the skin part, and finally trimming to finish the process.
Further, after the skin part is molded, the blank is sheared to leave milling allowance.
Further, the number of skin locating holes is 2.
Further, the first movable clamp or the second movable clamp is composed of 2 bolts and a bolt cushion block, and the first movable clamp and the second movable clamp are fixedly connected through threaded holes.
Further, the first movable clamp and the second movable clamp are spaced from each other and are uniformly arranged.
The invention has the beneficial effects that:
aiming at the characteristics of flutter, low machining precision, low efficiency and the like generated in the traditional numerical control milling process of the skin parts, the invention simplifies the skin machining process flow, obviously improves the skin production efficiency and the machining quality, saves the die manufacturing cost, and is suitable for mass production of the skin parts and popularization of technical achievements.
Drawings
FIG. 1 is a schematic view of the structure of the present invention illustrating the structure of the threaded bores and pin holes;
FIG. 2 is a schematic view of a drawing die tooling of the present invention;
fig. 3 is a schematic structural view of a first movable clamp and a second movable clamp of the present invention.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures: a method for clamping a sawtooth aircraft skin and milling a numerical control appearance comprises the following steps:
the method comprises the steps of taking down a first movable clamp 4 and a second movable clamp 5 when a skin part 2 is subjected to drawing type, shearing a blank after the skin part 2 is subjected to drawing type, drilling a skin positioning hole 1, then positioning the skin part 2 on a drawing type die 3, sequentially clamping the skin part by using the first movable clamp 4 and the second movable clamp 5, carrying out numerical control contour milling on the skin part 2 on a drawing type die tool after transformation on a numerical control milling machine after clamping, leaving the thickness of the skin part 2 for non-milling in order to prevent vibration after the milling of the skin part 2, taking down the skin part 2 after the milling is finished, and trimming by a fitter.
Wherein the milling sequence is as follows:
firstly, the first movable clamp 4 is used for clamping the skin part 2 and then milling is carried out, after the process is finished, the first movable clamp 4 is taken down, then the second movable clamp 5 is used for clamping the skin part 2 and then milling is carried out until the final milling of the appearance of the skin part 2 is finished, and finally trimming is carried out to finish the process.
And cutting the blank to leave milling allowance after the skin part 2 is subjected to drawing molding.
The number of the skin positioning holes 1 is 2.
The first movable clamp 4 or the second movable clamp 5 is composed of 2 bolts 6 and a bolt cushion block 7, and the first movable clamp 4 and the second movable clamp 5 are fixedly connected through a threaded hole 8.
The first movable jig 4 and the second movable jig 5 are spaced apart from each other and arranged uniformly.
The technology for clamping the sawtooth aircraft skin and milling the numerical control appearance mainly aims to solve the problem that a plurality of processes are completed by using one set of die tool in the numerical control appearance milling and forming of large curved surface skin parts. Wherein the equipment mainly comprises two parts: and designing and manufacturing a movable clamp by the original drawing die after secondary transformation. After the secondary transformation, the original drawing die is drilled with a skin positioning hole, and the movable clamp is used for positioning the part and acting as a clamp.
The anti-flutter device is characterized in that movable clamps (shown in figure 3) are additionally arranged on a skin forming die tool, wherein the movable clamps are uniformly distributed, and the distance between the movable clamps at the corners of the part can be properly reduced, so that the part can be better clamped and positioned.
In the part stretch forming process, the movable clamp is taken down and then the part is formed, after the skin part is formed, the movable clamp is used for clamping the part, trimming and milling are carried out on the part area by adopting a distribution method according to the curved surface characteristics of the part, and then the repeated work is carried out until the milling of the part appearance is finished.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for clamping a sawtooth aircraft skin and milling a numerical control appearance is characterized by comprising the following steps:
the method comprises the following steps that when a skin part (2) is subjected to drawing type, a first movable clamp (4) and a second movable clamp (5) are taken down, a blank is cut after the skin part (2) is drawn type, a skin positioning hole (1) is drilled, then the skin part (2) is positioned on a drawing type die (3) and then sequentially clamped by the first movable clamp (4) and the second movable clamp (5), numerical control contour milling is carried out on the skin part (2) on a numerical control milling machine on a drawing type die tool after transformation after clamping, in order to prevent vibration after the milling of the skin part (2), the thickness of the skin part (2) is reserved without milling, the skin part (2) is taken down after milling, and a bench worker carries out trimming;
the method comprises the steps of firstly clamping the skin part (2) by using a first movable clamp (4) and then milling, taking down the first movable clamp (4) after finishing the process, then clamping the skin part (2) by using a second movable clamp (5) and then milling until finishing the final milling of the appearance of the skin part (2), and finally trimming to finish the process.
2. The method for skin clamping and numerical control contour milling of a sawtooth aircraft as claimed in claim 1, wherein: and after the skin part (2) is subjected to drawing, shearing of a blank is carried out, and milling allowance is reserved.
3. The method for skin clamping and numerical control contour milling of a sawtooth aircraft as claimed in claim 1, wherein: the number of the skin positioning holes (1) is 2.
4. The method for skin clamping and numerical control contour milling of a sawtooth aircraft as claimed in claim 1, wherein: the first movable clamp (4) or the second movable clamp (5) is composed of 2 bolts (6) and a bolt cushion block (7), and the first movable clamp (4) and the second movable clamp (5) are fixedly connected through a threaded hole (8).
5. The method for skin clamping and numerical control contour milling of a sawtooth aircraft as claimed in claim 1, wherein: the first movable clamp (4) and the second movable clamp (5) are spaced and uniformly arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811498202.8A CN109530764B (en) | 2018-12-07 | 2018-12-07 | Sawtooth aircraft skin clamping and numerical control appearance milling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811498202.8A CN109530764B (en) | 2018-12-07 | 2018-12-07 | Sawtooth aircraft skin clamping and numerical control appearance milling method |
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| CN109530764A CN109530764A (en) | 2019-03-29 |
| CN109530764B true CN109530764B (en) | 2021-07-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112371846B (en) * | 2020-10-22 | 2022-05-10 | 中国航发贵州黎阳航空动力有限公司 | Multifunctional skin stretch-forming die and stretch-forming method |
| CN112536607B (en) * | 2020-11-17 | 2023-03-24 | 西安飞机工业（集团）有限责任公司 | Combined tool for skin stretch forming and numerical control milling and use method |
| CN114193159B (en) * | 2021-12-08 | 2023-03-24 | 北京星航机电装备有限公司 | Processing method of inorganic phenolic aerogel opening cover structure |
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| CN2736099Y (en) * | 2004-11-04 | 2005-10-26 | 沈阳飞机工业（集团）有限公司 | Die for drawing, milling and cutting |
| CN101733453B (en) * | 2008-11-21 | 2011-05-11 | 成都飞机工业（集团）有限责任公司 | Numerical control part milling processing clamping method |
| CN102133655B (en) * | 2010-12-28 | 2013-02-13 | 江西昌河航空工业有限公司 | Method for processing aluminum alloy ultrathin slant shim part |
| CN104259774B (en) * | 2014-09-09 | 2017-02-15 | 黄河科技学院 | Plane wing titanium alloy thin-wall web efficient numerical control machining technology |
| CN107570628B (en) * | 2017-09-18 | 2019-03-05 | 沈阳飞机工业（集团）有限公司 | Crotch class aircraft skin product forming tooling and forming technology |
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