CN102581211A - Cold forming method for integral aluminum alloy pull rod of aircraft - Google Patents
Cold forming method for integral aluminum alloy pull rod of aircraft Download PDFInfo
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- CN102581211A CN102581211A CN2012100234486A CN201210023448A CN102581211A CN 102581211 A CN102581211 A CN 102581211A CN 2012100234486 A CN2012100234486 A CN 2012100234486A CN 201210023448 A CN201210023448 A CN 201210023448A CN 102581211 A CN102581211 A CN 102581211A
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- reducing
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Abstract
The invention belongs to cold forming technology, and relates to an improved method for machining an integral aluminum alloy pull rod of an aircraft. The method is characterized in that cold forming includes the steps: selecting pipe specifications; feeding; forming a thin-wall section (1); removing allowance; and forming a transitional section (2) and a thickening a necking section (3). By the aid of the cold forming method for the integral aluminum alloy pull rod of the aircraft, process steps are simplified, the problem of high-precision control is avoided, the strength and the corrosion resistance of the aluminum alloy pull rod are improved, dimensional accuracy and coaxial accuracy of a formed part are ensured, the quality of the aluminum alloy pull rod is stabilized, and product qualification rate and machining efficiency are increased.
Description
Technical field
The invention belongs to the cold forming technology, relate to improvement airborne vehicle integral aluminum alloy pull bar processing method.
Prior art
The integral aluminum alloy pull bar that advanced airborne vehicle adopts is referring to Fig. 1, the thickening reducing section 3 and will approach of the wall ratio two ends of middle thin segment 1, and the big wall thickness structure that two ends thicken reducing section 3 to be needed is difficult to realization with conventional manufacturing process.Present manufacturing process is: adopt first heat to thicken, the thermoforming process method of pyrocondensation mouth accomplish to be shaped again.Hot forming is very accurate to the temperature control requirement in part forming district, and temperature is crossed to hang down and will be caused shaping form not in place; Temperature is too high will to cause overheated, burning, and the intensity, plasticity that makes aluminium alloy especially toughness significantly reduces.And the cooling naturally of heating back, the intensity of aluminium alloy and corrosion stability are reduced.In addition, the dimensional accuracy and the coaxial precision of the back part that is shaped are all very low, and often appearance such as diameter of bore, reducing section axial length and pull bar total length equidimension is overproof, causes part quality unstable, and part qualification rate and working (machining) efficiency are very low.
Summary of the invention
The objective of the invention is: propose a kind of airborne vehicle integral aluminum alloy pull bar cold forming processing method; To simplify processing step; Improve the intensity and the corrosion stability of aluminum alloy pull rod; Guarantee the dimensional accuracy and the coaxial precision of shaping back part, stablize the quality of aluminum alloy pull rod, improve product percent of pass and working (machining) efficiency.
Technical scheme of the present invention is: airborne vehicle integral aluminum alloy pull bar cold forming method; The aluminum alloy pull rod of formed thereby is a hollow pipe fitting; It is made up of with the changeover portion 2 that is connected thin segment 1 and thickens reducing section 3 the reducing section 3 that thickens at the thin segment 1 of centre, two ends; the changeover portion 2 at thin segment 1 two ends and the symmetrical configuration that thickens reducing section 3, and the endoporus that thickens reducing section 3 has internal thread; It is characterized in that the step of cold forming is following:
1, select pipe gauge lattice: selecting external diameter and wall thickness is raw material greater than the aluminium-alloy pipe material of thin segment 1 all, and the warp cutting forms woollen, and the D outer diameter 0 of aluminium-alloy pipe material is calculated as follows, and unit is mm:
D0＝D+2t0+1.....................................................................(1)
In the formula:
D is the external diameter of thin segment 1, and unit is mm;
T0 is the wall thickness of aluminium-alloy pipe material, and unit is mm;
The wall thickness t0 of aluminium-alloy pipe material is calculated as follows:
In the formula:
T is the wall thickness that thickens reducing section 3, and unit is mm;
D1 is the external diameter that thickens reducing section 3, and unit is mm;
The wall thickness t that thickens reducing section 3 is calculated as follows:
In the formula:
D1 is the internal diameter that thickens reducing section 3 internal threads, and unit is mm;
2, blanking: by the length blanking of regulation, and with sharp corner deburring and chamfering inside and outside the pipe termination;
3, the shaping thin segment 1: shape thin segment 1 through swaging; Woolen cloth is clamped in delivers to earlier on the feed mechanism behind the Working position with the feeding of 800mm/min speed; Be inserted with plug in the woolen cloth, utilize attenuate to swage mould the attenuation of swaging of the middle part of woolen cloth, speed of mainshaft 120r/min; Outer shroud rotating speed 260r/min makes external diameter, wall thickness and the length of woollen middle part reach the size that drawing is stipulated;
4, go surplus: excision two ends process allowance makes woollen total length consistent with the part total length;
5, shaping changeover portion 2 and thicken reducing section 3: carry out the reducing that thickens of a woollen end earlier: be clamped on the feed mechanism woolen cloth and with the feeding of 500mm/min speed; Utilize reducing to swage mould to the reducing of swaging of part one end; Speed of mainshaft 120r/min; Outer shroud rotating speed 260r/min makes woollen end formation changeover portion 2 and thickens reducing section 3, guarantees changeover portion 2 and the dimensional requirement that thickens reducing section 3; Excision thickens the surplus of reducing section 3 after the reducing; Then, carry out the reducing that thickens of the woollen other end according to the method described above.
Advantage of the present invention is: proposed a kind of airborne vehicle integral aluminum alloy pull bar cold forming processing method; Simplified processing step; Avoided the difficult problem of High Accuracy Control problem, improved the intensity and the corrosion stability of aluminum alloy pull rod, the dimensional accuracy and the coaxial precision of part after having guaranteed to be shaped; Stablize the quality of aluminum alloy pull rod, improved product percent of pass and working (machining) efficiency.
Description of drawings
Fig. 1 is a kind of structural representation of integral aluminum alloy pull bar of existing airborne vehicle employing.
The specific embodiment
Explain further details in the face of the present invention down.Airborne vehicle integral aluminum alloy pull bar cold forming method; The aluminum alloy pull rod of formed thereby is a hollow pipe fitting; It is made up of with the changeover portion 2 that is connected thin segment 1 and thickens reducing section 3 the reducing section 3 that thickens at the thin segment 1 of centre, two ends; the changeover portion 2 at thin segment 1 two ends and the symmetrical configuration that thickens reducing section 3, and the endoporus that thickens reducing section 3 has internal thread; It is characterized in that the step of cold forming is following:
1, select pipe gauge lattice: selecting external diameter and wall thickness is raw material greater than the aluminium-alloy pipe material of thin segment 1 all, and the warp cutting forms woollen, and the D outer diameter 0 of aluminium-alloy pipe material is calculated as follows, and unit is mm:
D0＝D+2t0+1..........................................................................(1)
In the formula:
D is the external diameter of thin segment 1, and unit is mm;
T0 is the wall thickness of aluminium-alloy pipe material, and unit is mm;
The wall thickness t0 of aluminium-alloy pipe material is calculated as follows:
In the formula:
T is the wall thickness that thickens reducing section 3, and unit is mm;
D1 is the external diameter that thickens reducing section 3, and unit is mm;
The wall thickness t that thickens reducing section 3 is calculated as follows:
In the formula:
D1 is the internal diameter that thickens reducing section 3 internal threads, and unit is mm;
2, blanking: by the length blanking of regulation, and with sharp corner deburring and chamfering inside and outside the pipe termination;
3, the shaping thin segment 1: shape thin segment 1 through swaging; Woolen cloth is clamped in delivers to earlier on the feed mechanism behind the Working position with the feeding of 800mm/min speed; Be inserted with plug in the woolen cloth, utilize attenuate to swage mould the attenuation of swaging of the middle part of woolen cloth, speed of mainshaft 120r/min; Outer shroud rotating speed 260r/min makes external diameter, wall thickness and the length of woollen middle part reach the size that drawing is stipulated;
4, go surplus: excision two ends process allowance, woollen total length is consistent with the part total length;
5, shaping changeover portion 2 and thicken reducing section 3: carry out the reducing that thickens of a woollen end earlier: be clamped on the feed mechanism woolen cloth and with the feeding of 500mm/min speed; Utilize reducing to swage mould to the reducing of swaging of part one end; Speed of mainshaft 120r/min; Outer shroud rotating speed 260r/min makes woollen end formation changeover portion 2 and thickens reducing section 3, guarantees changeover portion 2 and the dimensional requirement that thickens reducing section 3; Excision thickens the surplus of reducing section 3 after the reducing; Then, carry out the reducing that thickens of the woollen other end according to the method described above.
Embodiment 1
In the manufacturing of A type helicopter control system integral aluminum alloy pull bar, used the present invention.
Accessory size: D=28mm, t=1mm, D1=14mm, d1=8mm, length overall L=1085mm thickens reducing segment length l=18mm
Part material: 2017A-O
Implementation step:
1, selects pipe gauge lattice: through analysis to the part pattern; Select rational specifications of raw materials; Be not adopt thermoforming process that adopt with aluminium alloy pipe part middle part external diameter, consistent wall thickness, but adopt than part middle part external diameter, aluminium alloy pipe that wall thickness is bigger.The former thermoforming of certain part is with G28 * 1mm tubing, and existing cold forming is with G32 * 2mm tubing.
2, blanking: press MAT'L specification inspection pipe,, and deburring inside and outside the pipe termination, outer surface fallen R2 then by the length blanking of regulation.
3, the shaping thin segment 1: shape thin segment 1 through swaging, woolen cloth is clamped in delivers to earlier on the feed mechanism behind the Working position with the feeding of 800mm/min speed, be inserted with plug in the woolen cloth; Utilize attenuate to swage mould to the attenuation of swaging of the middle part of woolen cloth; Speed of mainshaft 120r/min, outer shroud rotating speed 260r/min makes the external diameter of woollen middle part reach 28mm; Wall thickness reaches 1mm, and length reaches 916mm.
4, go surplus: excision two ends process allowance, woollen total length is 1085mm.
5, shaping changeover portion 2 and thicken reducing section 3: carry out the reducing that thickens of a woollen end earlier: be clamped on the feed mechanism woolen cloth and with the feeding of 500mm/min speed; Utilize reducing to swage mould to the reducing of swaging of part one end, speed of mainshaft 120r/min, outer shroud rotating speed 260r/min; Make woollen end formation changeover portion 2 and thicken reducing section 3; Guarantee changeover portion 2 and the dimensional requirement that thickens reducing section 3, thicken reducing section external diameter and reach 14mm that wall thickness reaches 3mm; Excision thickens the surplus of reducing section 3 after the reducing, guarantees to thicken reducing segment length l=18mm; Then, carry out thickening reducing and excising surplus of the woollen other end according to the method described above.
In the manufacturing of Type B helicopter control system integral aluminum alloy pull bar, used the present invention.
Accessory size: D=25mm, t=1mm, D1=15.5mm, d1=8mm, length overall L=579mm thickens reducing segment length l=18mm
Part material: 2017A-O
Implementation step:
1, selects pipe gauge lattice: through analysis, select rational specifications of raw materials, adopted G30 * 2.8mm tubing to the part pattern.
2, blanking: press MAT'L specification inspection pipe,, and deburring inside and outside the pipe termination, outer surface fallen R2 then by the length blanking of regulation.
3, the shaping thin segment 1: shape thin segment 1 through swaging, woolen cloth is clamped in delivers to earlier on the feed mechanism behind the Working position with the feeding of 800mm/min speed, be inserted with plug in the woolen cloth; Utilize attenuate to swage mould to the attenuation of swaging of the middle part of woolen cloth; Speed of mainshaft 120r/min, outer shroud rotating speed 260r/min makes the external diameter of woollen middle part reach 25mm; Wall thickness reaches 1mm, and length reaches 452.5mm.
4, go surplus: excision two ends process allowance, woollen total length is 579mm.
5, shaping changeover portion 2 and thicken reducing section 3: carry out the reducing that thickens of a woollen end earlier: be clamped on the feed mechanism woolen cloth and with the feeding of 500mm/min speed; Utilize reducing to swage mould to the reducing of swaging of part one end, speed of mainshaft 120r/min, outer shroud rotating speed 260r/min; Make woollen end formation changeover portion 2 and thicken reducing section 3; Guarantee changeover portion 2 and the dimensional requirement that thickens reducing section 3, thicken reducing section external diameter and reach 15.5mm that wall thickness reaches 3.8mm; Excision thickens the surplus of reducing section 3 after the reducing, guarantees to thicken reducing segment length l=18mm; Then, carry out thickening reducing and excising surplus of the woollen other end according to the method described above.
Embodiment 3
In the manufacturing of C type helicopter control system integral aluminum alloy pull bar, used the present invention.
Accessory size: D=32mm, t=2.5mm, D1=20mm, d1=12mm, length overall L=237mm thickens reducing segment length l=18mm
Part material: 2A12-O
Implementation step:
1, selects pipe gauge lattice: through analysis, select rational specifications of raw materials, adopted G35 * 3.5mm tubing to the part pattern.
2, blanking: press MAT'L specification inspection pipe,, and deburring inside and outside the pipe termination, outer surface fallen R2 then by the length blanking of regulation.
3, the shaping thin segment 1: shape thin segment 1 through swaging, woolen cloth is clamped in delivers to Working position on the feed mechanism, be inserted with plug in the woolen cloth; Utilize attenuate to swage mould to the attenuation of swaging of the middle part of woolen cloth; Speed of mainshaft 120r/min, outer shroud rotating speed 260r/min makes the external diameter of woollen middle part reach 32mm; Wall thickness reaches 2.5mm, and length reaches 86.7mm.
4, go surplus: excision two ends process allowance, woollen total length is 237mm.
5, shaping changeover portion 2 and thicken reducing section 3: carry out the reducing that thickens of a woollen end earlier: be clamped on the feed mechanism woolen cloth and with the feeding of 500mm/min speed; Utilize reducing to swage mould to the reducing of swaging of part one end, speed of mainshaft 120r/min, outer shroud rotating speed 260r/min; Make woollen end formation changeover portion 2 and thicken reducing section 3; Guarantee changeover portion 2 and the dimensional requirement that thickens reducing section 3, thicken reducing section external diameter and reach 20mm that wall thickness reaches 4.6mm; Excision thickens the surplus of reducing section 3 after the reducing, guarantees to thicken reducing segment length l=18mm; Then, carry out thickening reducing and excising surplus of the woollen other end according to the method described above.
Claims (1)
1. airborne vehicle integral aluminum alloy pull bar cold forming method; The aluminum alloy pull rod of formed thereby is a hollow pipe fitting; It is made up of with the changeover portion [2] that is connected thin segment [1] and thickens reducing section [3] the reducing section [3] that thickens at the thin segment [1] of centre, two ends; the changeover portion [2] at thin segment [1] two ends and thicken the symmetrical configuration of reducing section [3], and the endoporus that thickens reducing section [3] has internal thread; It is characterized in that the step of cold forming is following:
1.1, select pipe gauge lattice: selecting external diameter and wall thickness is raw material greater than the aluminium-alloy pipe material of thin segment [1] all, forms woolen cloth through cutting, and the D outer diameter 0 of aluminium-alloy pipe material is calculated as follows, and unit is mm:
D0＝D+2t0+1........................................................................(1)
In the formula:
D is the external diameter of thin segment [1], and unit is mm;
T0 is the wall thickness of aluminium-alloy pipe material, and unit is mm;
The wall thickness t0 of aluminium-alloy pipe material is calculated as follows:
In the formula:
T is for thickening the wall thickness of reducing section [3], and unit is mm;
D1 is for thickening the external diameter of reducing section [3], and unit is mm;
The wall thickness t that thickens reducing section [3] is calculated as follows:
In the formula:
D1 is for thickening the internal diameter of reducing section [3] internal thread, and unit is mm;
1.2, blanking: by the length blanking of regulation, and with sharp corner deburring and chamfering inside and outside the pipe termination;
1.3, shaping thin segment [1]: shape thin segment [1] through swaging; Woolen cloth is clamped in delivers to earlier on the feed mechanism behind the Working position with the feeding of 800mm/min speed; Be inserted with plug in the woolen cloth, utilize attenuate to swage mould the attenuation of swaging of the middle part of woolen cloth, speed of mainshaft 120r/min; Outer shroud rotating speed 260r/min makes external diameter, wall thickness and the length of woollen middle part reach the size that drawing is stipulated;
1.4, go surplus: excision two ends process allowance makes woollen total length consistent with the part total length;
1.5, shaping changeover portion [2] and thicken reducing section [3]: carry out the reducing that thickens of a woollen end earlier: be clamped on the feed mechanism woolen cloth and with the feeding of 500mm/min speed; Utilize reducing to swage mould to the reducing of swaging of part one end; Speed of mainshaft 120r/min; Outer shroud rotating speed 260r/min makes a woollen end form changeover portion [2] and thickens reducing section [3], assurance changeover portion [2] and thicken the dimensional requirement of reducing section [3]; Excision thickens the surplus of reducing section [3] after the reducing; Then, carry out the reducing that thickens of the woollen other end according to the method described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210023448.6A CN102581211B (en) | 2012-02-02 | 2012-02-02 | Cold forming method for integral aluminum alloy pull rod of aircraft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210023448.6A CN102581211B (en) | 2012-02-02 | 2012-02-02 | Cold forming method for integral aluminum alloy pull rod of aircraft |
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| CN102581211A true CN102581211A (en) | 2012-07-18 |
| CN102581211B CN102581211B (en) | 2014-08-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103192985A (en) * | 2012-01-10 | 2013-07-10 | 江苏希西维轴承有限公司 | Novel integrated structure pull bar for airplane |
| CN104493035A (en) * | 2014-11-24 | 2015-04-08 | 西安创新精密仪器研究所 | Rotary swaging method for processing pull rods |
| CN105710266A (en) * | 2016-04-06 | 2016-06-29 | 乐清市弘德金属有限公司 | Electric hammer drill bit cold-headed part molding process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4430068A1 (en) * | 1994-08-30 | 1996-03-07 | Plettac Ag | Process for manufacturing scaffolding tubes |
| CN1672827A (en) * | 2004-03-22 | 2005-09-28 | 乔治·A·米切尔公司 | Method for producing metal ball bar |
| CN1684783A (en) * | 2002-09-26 | 2005-10-19 | 费尔斯有限公司 | Method and device for the production of a tubular workpiece, particularly a shock absorber piston rod, and such a workpiece |
| CN101060942A (en) * | 2004-11-20 | 2007-10-24 | Gkn动力传动国际有限公司 | Reduction of tubes by means of a graduated mandrel for producing tubular shafts with an undercut in an operation |
| CN101176905A (en) * | 2003-12-22 | 2008-05-14 | 本田技研工业株式会社 | Method of forming member,valve guide and method of forming the same and method of forming tubular member |
| CN101389921A (en) * | 2006-02-23 | 2009-03-18 | 斯特姆鲁格公司 | Composite firearm barrels |
-
2012
- 2012-02-02 CN CN201210023448.6A patent/CN102581211B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4430068A1 (en) * | 1994-08-30 | 1996-03-07 | Plettac Ag | Process for manufacturing scaffolding tubes |
| CN1684783A (en) * | 2002-09-26 | 2005-10-19 | 费尔斯有限公司 | Method and device for the production of a tubular workpiece, particularly a shock absorber piston rod, and such a workpiece |
| CN101176905A (en) * | 2003-12-22 | 2008-05-14 | 本田技研工业株式会社 | Method of forming member,valve guide and method of forming the same and method of forming tubular member |
| CN1672827A (en) * | 2004-03-22 | 2005-09-28 | 乔治·A·米切尔公司 | Method for producing metal ball bar |
| CN101060942A (en) * | 2004-11-20 | 2007-10-24 | Gkn动力传动国际有限公司 | Reduction of tubes by means of a graduated mandrel for producing tubular shafts with an undercut in an operation |
| CN101389921A (en) * | 2006-02-23 | 2009-03-18 | 斯特姆鲁格公司 | Composite firearm barrels |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103192985A (en) * | 2012-01-10 | 2013-07-10 | 江苏希西维轴承有限公司 | Novel integrated structure pull bar for airplane |
| CN104493035A (en) * | 2014-11-24 | 2015-04-08 | 西安创新精密仪器研究所 | Rotary swaging method for processing pull rods |
| CN105710266A (en) * | 2016-04-06 | 2016-06-29 | 乐清市弘德金属有限公司 | Electric hammer drill bit cold-headed part molding process |
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| CN102581211B (en) | 2014-08-06 |
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