CN101670462B - Wall plate processing technology for hyperboloid thin wall - Google Patents

Wall plate processing technology for hyperboloid thin wall Download PDF

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Publication number
CN101670462B
CN101670462B CN2009101861280A CN200910186128A CN101670462B CN 101670462 B CN101670462 B CN 101670462B CN 2009101861280 A CN2009101861280 A CN 2009101861280A CN 200910186128 A CN200910186128 A CN 200910186128A CN 101670462 B CN101670462 B CN 101670462B
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technology
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CN101670462A (en
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廖翔
袁柳
黎明
傅勇
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Jiangxi Hongdu Aviation Industry Group Co Ltd
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Jiangxi Hongdu Aviation Industry Group Co Ltd
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Abstract

The invention relates to a wall plate processing technology for hyperboloid thin wall, belonging to the field of the mechanical processing technology. The process of producing the thin-wall wall board with double curved surfaces comprises the steps of rough finishing by a three-coordinate numerically controlled milling machine, heat-treating, semifinishing by a five-coordinate numerically controlled milling machine, natural aging, finishing by the five-coordinate numerically controlled milling machine, finishing on a vacuum platform and process boss cutting. The margin of the parts can be eliminated evenly and the deformation of the parts can be reduced to the maximum extent by adjusting the parameters including the processing allowance, the processing speed, the milling mode and the like in each numerically controlled procedure. The difficult problem of part clamping and positioning is solved by adopting the vacuum absorbing platform integrally having a cambered surface to absorb and process the parts.

Description

A kind of wall plate processing technology for hyperboloid thin wall
Technical field:
The present invention relates to the Machining Technology field, particularly a kind of wall plate processing technology for hyperboloid thin wall.
Background technology
The fuel tanker wallboard is to adopt hyperboloid thin-walled wallboard, and material is the LD5 aluminium alloy, and the wall thickness thinnest part is 1.5mm, for increasing part strength, the many places rib is arranged on the curved profile face generally.Therefore, this class part shape complexity, difficulty of processing is big.At present, this part generally is that sheet metal component or plane thin-wall part form curved surface through bead.Adopting panel beating, when riveted joint was shaped at last, the sealing of rib and web can't guarantee, has oil leakage phenomenon, can't satisfy instructions for use; The contour peening mode only is applicable to the wallboard that radian is little, and is powerless for the part that curvature is big.Integral body is carried out machining, does not then have the shortcoming of above processing mode, but difficulty of processing is very big.General thin-wall part web face all is planes, then at monolateral or bilateral increase rib.Processing scheme mainly increases the technology patch around part, during processing parts, utilize technology patch and fabrication hole to position.But the hyperboloid thin-wall part is because the part profile is a cambered surface, and part itself does not have the plane to position, and can't adopt general process to process.
Process this part following three big difficult points are arranged: 1) part is the hyperboloid thin-wall part, controls the big difficult point that is deformed into of part in the processing; 2) part does not have the plane to can be used as the benchmark of clamping, location; And part is a curved surface thin wall type structure, does not have rational special tooling to position clamping, and web thickness 1.5mm is difficult to guarantee; 3) part shape complexity, the establishment of program, rational cutting way are difficult to customization.
Summary of the invention
The objective of the invention is, by regulating the allowance of each numerical control program, parameters such as process velocity, tool path pattern make part can remove surplus uniformly, reduce the deflection of part to greatest extent; Adopt the whole cambered surface vacuum absorbing platform part is adsorbed processing, solved the difficult problem of parts fixation, location.
Technical scheme of the present invention is that a kind of wall plate processing technology for hyperboloid thin wall adopts three-dimensional general NC milling machine to carry out roughing, adopts five coordinate High Speed Milling Operation to carry out semifinishing and fine finishining, it is characterized in that technological process is as follows:
1) roughing: at first, with pressing plate groove clamping, carry out the processing of matrix face in the blank both sides, process back blank matrix face made allowance 15mm, process the technology patch of both sides simultaneously, the technology patch is concordant with the both sides of matrix face; Then, turn-over carries out the processing of convex face, and elder generation to 1/4 of hyperboloid thin-walled wallboard blank height, processes the plane milling of the technology patch of convex face both sides the back convex surface and stays process allowance 15mm before the processing; The front/rear end of machining blanks, and process two locator tabs with holes in the centerline of part convex surface most significant end, and locator tabs is connected as a single entity with the front and back end respectively;
2) heat treatment, σ b 〉=365MPa; Use salt bath quenching, 505 ℃~525 ℃ of holding temperatures, time 120min, natrual ageing>96h;
3) semifinishing:
A. process the matrix face; Matrix is faced up, and with standard cushion block bed hedgehopping and clamp the technology patch of both sides, processing matrix face is reserved the 5mm process allowance;
B. process the convex face; Convex is faced up, with the probe on the lathe locator tabs is positioned, processing convex face is reserved the 3mm process allowance;
4) timeliness: natrual ageing 48 hours;
5) fine finishining:
A. process the matrix face; Matrix is faced up, with standard cushion block bed hedgehopping and clamp the technology patch of both sides, locator tabs is positioned, measure behind the fine finishining concave surface by the probe on the lathe;
B. process the convex face; Convex is faced up, hyperboloid thin-walled wallboard is clamped on the vacuum platform of prefabricated profile, it is smooth that the profile and the corresponding absorption of prefabrication type face of vacuum platform are fitted, and positions with locator tabs, carry out convex surface fine finishining, make hyperboloid thin-walled wallboard thickness reach 1.5mm;
6) cut off technology patch and locator tabs.
Described prefabricated profile is the outer mold surface pattern corresponding with the matrix face of part.
Advantage of the present invention is, reduced the deflection of part, solved the difficult problem of parts fixation, location, before reality processing, also used machining simulation software to carry out program verification, check out the mistake of numerical control program and the excess of stroke of lathe effectively, variety of issues such as collision guarantee the correctness of numerical control program to greatest extent.
Description of drawings
Fig. 1 is the schematic diagram of hyperboloid thin-walled wallboard of the present invention
Fig. 2 is the concave surface clamping schematic diagram of hyperboloid thin-walled wallboard among the present invention
Fig. 3 is the convex surface clamping schematic diagram of hyperboloid thin-walled wallboard among the present invention
Fig. 4 is the vacuum platform clamping schematic diagram of hyperboloid thin-walled wallboard among the present invention
The specific embodiment
With reference to the accompanying drawings 1 to 4, the invention will be further described, and hyperboloid thin-walled wallboard of the present invention adopts three-dimensional general NC milling machine to carry out roughing, adopts five coordinate High Speed Milling Operation to carry out semifinishing and fine finishining, and technological process is as follows:
1) roughing: at first, with pressing plate groove clamping, carry out the processing of matrix face in the blank both sides, process back blank matrix face made allowance 15mm, process the technology patch 2 of both sides simultaneously, technology patch 2 is concordant with the both sides of matrix face; Then, turn-over carries out the processing of convex face, and elder generation to 1/4 of hyperboloid thin-walled wallboard blank height, processes the plane milling of the technology patch 2 of convex face both sides the back convex surface and stays process allowance 15mm before the processing; The front/rear end of machining blanks, and process two locator tabs with holes 1 in the centerline of part convex surface most significant end, and locator tabs 1 is connected as a single entity with the front and back end respectively;
2) heat treatment, σ b 〉=365MPa; Use salt bath quenching, 505 ℃~525 ℃ of holding temperatures, time 120min, natrual ageing>96h;
3) semifinishing:
A. process the matrix face; Matrix is faced up, and with standard cushion block 3 bed hedgehoppings and clamp the technology patch 2 of both sides, processing matrix face is reserved the 5mm process allowance;
B. process the convex face; Convex is faced up, with the probe on the lathe locator tabs 1 is positioned, processing convex face is reserved the 3mm process allowance;
4) timeliness: natrual ageing 48 hours;
5) fine finishining:
A. process the matrix face; Matrix is faced up, with standard cushion block 3 bed hedgehoppings and clamp the technology patch 2 of both sides, locator tabs 1 is positioned, measure behind the fine finishining concave surface by the probe on the lathe;
B. process the convex face; Convex is faced up, hyperboloid thin-walled wallboard is clamped on the vacuum platform of prefabricated profile, it is smooth that the profile and the corresponding absorption of prefabrication type face of vacuum platform are fitted, and positions with locator tabs 1, carry out convex surface fine finishining, make hyperboloid thin-walled wallboard thickness reach 1.5mm;
6) cut off technology patch 2 and locator tabs 1.
Described prefabricated profile is the outer mold surface pattern corresponding with the matrix face of part.
Concrete machined parameters is as follows:
1) roughing
Use lathe: three-dimensional general NC milling machine;
Use cutter: φ 40R5 edge blade slotting cutter;
Machined parameters: cutting-in 5~8mm; Cut wide 32mm; Part made allowance 15mm;
Lathe rotating speed: 1200rpm;
Cutting speed: 800mmpm.
2) semifinishing
Use lathe: five coordinate High Speed Milling Operation;
Use cutter: φ 20R3 whole hard alloy cutter;
Machined parameters: cutting-in 2~4mm; Cut wide 6mm; Part made allowance 2~4mm;
Lathe rotating speed: 13000~16000rpm;
Cutting speed: 8000~12000mmpm.
3) fine finishining
Use lathe: five coordinate High Speed Milling Operation;
Use cutter: φ 20R3 whole hard alloy cutter;
Machined parameters: cutting-in 0.5~2mm; Cut wide 2~4mm;
Lathe rotating speed: 13000~16000rpm;
Cutting speed: 8000~12000mmpm.
Above processing technology is used to process hyperboloid thin-walled class heavy parts (being generally the band curved wall plate parts on the aircraft), can effectively control part deformation, guarantees the thin-walled wall thickness dimension.

Claims (2)

1. a wall plate processing technology for hyperboloid thin wall adopts three-dimensional general NC milling machine to carry out roughing, adopts five coordinate High Speed Milling Operation to carry out semifinishing and fine finishining, it is characterized in that technological process is as follows:
1) roughing: at first, with pressing plate groove clamping, carry out the processing of matrix face in the blank both sides, process back blank matrix face made allowance 15mm, process the technology patch [2] of both sides simultaneously, technology patch [2] is concordant with the both sides of matrix face; Then, turn-over carries out the processing of convex face, and elder generation to 1/4 of hyperboloid thin-walled wallboard blank height, processes the plane milling of the technology patch [2] of convex face both sides back convex face and stays process allowance 15mm before the processing; The front/rear end of machining blanks, and process two locator tabs with holes [1] in the centerline of blank convex face most significant end, and locator tabs [1] is connected as a single entity with the blank front and back end respectively;
2) heat treatment, σ b 〉=365MPa; Use salt bath quenching, 505 ℃~525 ℃ of holding temperatures, time 120min, natrual ageing>96h;
3) semifinishing:
A. process the matrix face; Matrix is faced up, and with standard cushion block [3] bed hedgehopping and clamp the technology patch [2] of both sides, processing matrix face is reserved the 5mm process allowance;
B. process the convex face; Convex is faced up, with the probe on the lathe locator tabs [1] is positioned, processing convex face is reserved the 3mm process allowance;
4) timeliness: natrual ageing 48 hours;
5) fine finishining:
A. process the matrix face; Matrix is faced up, with standard cushion block [3] bed hedgehopping and clamp the technology patch [2] of both sides, locator tabs [1] is positioned, measure behind the fine finishining matrix face by the probe on the lathe;
B. process the convex face; Convex is faced up, hyperboloid thin-walled wallboard is clamped on the vacuum platform of prefabricated profile, it is smooth that the profile and the corresponding absorption of prefabrication type face of vacuum platform are fitted, and positions with locator tabs [1], carry out the fine finishining of convex face, make hyperboloid thin-walled wallboard thickness reach 1.5mm;
6) cut off technology patch [2] and locator tabs [1].
2. wall plate processing technology for hyperboloid thin wall according to claim 1 is characterized in that, described prefabricated profile is the outer mold surface of a pattern, and the outer mold surface of this pattern is corresponding with the matrix face of part.
CN2009101861280A 2009-09-29 2009-09-29 Wall plate processing technology for hyperboloid thin wall Active CN101670462B (en)

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