CN103861912A - Aluminum alloy pipe bend forming method - Google Patents
Aluminum alloy pipe bend forming method Download PDFInfo
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- CN103861912A CN103861912A CN201210540194.5A CN201210540194A CN103861912A CN 103861912 A CN103861912 A CN 103861912A CN 201210540194 A CN201210540194 A CN 201210540194A CN 103861912 A CN103861912 A CN 103861912A
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Abstract
The invention discloses an aluminum alloy pipe bend forming method and belongs to the technical field of machining. According to the method, low-melting-point alloy is used as a filler to achieve internal pressure supporting, and bend forming with controlled section deformation is achieved. The method has the advantages that the low-melting-point alloy is used as the filler so that strength and hardness of a pipe are improved, problems of sectional serious deformation, such as deboss and embossment after bend forming of an aluminum alloy pipe are solved, the sectional dimension of an aluminum alloy pipe bent piece can meet design requirements, and machining efficiency and qualified rate of the aluminum alloy pipe bent piece are increased. Besides, low-melting-point alloy is adjustable in melting point temperature, alloy composition can be adjusted according to machining requirements, the plasticity of the low-melting-point alloy is moderate and not prone to break during machining, and bend forming with low-melting-point alloy as the filler is advantageous.
Description
Technical field
The invention belongs to Machining Technology field, be specifically related to a kind of aluminium alloy pipe bending forming method.
Background technology
Because aluminium alloy pipe has higher specific strength, lightweight, the feature of a series of excellences such as perfect heat-dissipating, its bool is widely used in the fields such as Aeronautics and Astronautics, naval vessel, automobile as structural member, but because of its wall thickness, and inside is the reasons such as hollow, under the substantial load of bending forming process, the effect of tension compression, be out of shape inhomogeneous, there will be serious cross section distortion, as: cross section depression, projection, cause the part after bending forming uneven along peripheral surface, cannot meet so raw-material cross sectional shape and dimensional accuracy.
At present domestic all have some improvement to this type of tube bending forming technique, but all there are some defects, the present invention is on the basis of conventional aluminum alloy bending forming, using low-melting alloy as filler, in realizing, presses and supports and then control aluminium alloy section deformation in bending forming.
Summary of the invention
The object of this invention is to provide a kind of method of aluminium alloy pipe bending forming, there will be serious distortion with cross section after solving aluminium alloy pipe brake forming, as difficult problems such as depression, projections, guarantee that aluminium alloy pipe bool sectional dimension can meet design requirement, improve working (machining) efficiency and the qualification rate of aluminium alloy pipe bool.
A method for aluminium alloy pipe bending forming, carry out as follows:
(1) by an end opening of aluminium alloy pipe to be processed with stopper or directly welding carry out tight sealing, will seal end face extremely under, add low-melting alloy solid block in from upper end open toward tubing, add to apart from openend a bit of;
(2) tubing is tilted to be placed in heater, heating-up temperature is 100 ℃, and progressively heating from below to up, makes low-melting alloy fusing;
(3) after low-melting alloy melts completely, stop heating, tubing is vertically placed in to air cooling;
(4) to the complete cooled and solidified of low-melting alloy, aforementioned tubes is clamped in to stretch bending or the machine of going for a stroll on stretch bending or rotary draw bending;
(5) after forming tubular product, be placed in boiling water and allow low-melting alloy automatically flow out, then use steam flush, until low-melting alloy is all removed;
(6) proofread and correct tubing, incising pipes two ends surplus, completes forming tubular product manufacture.
The tin of the cadmium that described low-melting alloy is 6-8% by mass fraction, the lead of 17-19%, 22-25%, the zinc of 0-3%, surplus bismuth form.
The preparation method of above-mentioned low-melting alloy is: open melting resistance furnace, each component metals raw material that the purity configuring is more than 99.9% are placed in resistance furnace crucible, sprinkle coverture, as diboron trioxide, resistance furnace temperature is transferred to 400 ℃-500 ℃, after metal in crucible all melts, stir melt 1-2min, dross on surface of fusant is pulled out and again sprinkled coverture, after standing 2-3min, skim, tapping casting becomes fritter cooling.
Beneficial effect of the present invention is: utilize low-melting alloy to strengthen intensity and the hardness of tubing as filler, after having solved aluminium alloy pipe bending forming, cross section there will be serious distortion, as difficult problems such as depression, projections, guarantee that aluminium alloy pipe bool sectional dimension can meet design requirement, and has improved working (machining) efficiency and the qualification rate of aluminium alloy pipe bool.Another low-melting alloy melting temperature is adjustable, can regulate alloying component according to process requirements, and its plasticity is moderate, and non-friable in process, these have all embodied and have utilized low-melting alloy to carry out the superiority of bending forming as filler.
Accompanying drawing explanation
Aluminum rectangular tube material schematic diagram in Fig. 1 embodiment of the present invention 1.
The circular tubing schematic diagram of aluminium alloy in Fig. 2 embodiment of the present invention 2.
The specific embodiment
The principle of foundation of the present invention is: the elements such as cadmium, lead, tin, zinc and bismuth all belong to low-melting-point metal, and its fusing point is all below 400 ℃, and proportioning melting according to a certain percentage, can prepare fusing point at 40 ℃ of-160 ℃ of interval low-melting alloys.And Wood's metal bi content is between 45-55% time, and alloy is hot basically identical with cold conditions lower volume, and therefore this alloy can be filled in aluminum alloy thin walled pipe preferably, plays good supporting role.In single-piece operation, for the aluminum alloy thin walled pipe of bending forming, its length is generally more than one meter, if adopt, low-melting alloy fusing is poured in compo pipe with liquid form, easily cause filling place part to have pore, cause filling insufficient, affect the dimensional accuracy of the product of going for a stroll.Therefore the present invention adopts solid-state mode to add low-melting alloy, then, by heater progressively heating from below to up, makes solid metallic refuse and fills, and the method can effectively be discharged the gas in aluminium-alloy pipe.Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment 1
The material that the present embodiment is applied to bending forming is a kind of aluminum rectangular tube material, and sectional dimension is 14.1mm*12.1 mm, and wall thickness is 1.4mm, and length is 1.5m, as shown in Figure 1.In low-melting alloy, each element mass percent is cadmium 6%, lead 17%, and tin 23%, zinc 3%, bismuth 51%, fusing point 72 is spent.Its bending forming concrete steps are as follows:
1.1 prepare low-melting alloy, concrete grammar is as follows: open melting resistance furnace, the each component metals raw material (purity is more than 99.9%) that configure are placed in to resistance furnace crucible, sprinkle diboron trioxide as coverture, resistance furnace temperature is transferred to 400 ℃-500 ℃, after metal in crucible all melts, stir melt 1-2min, dross on surface of fusant is pulled out and again sprinkled diboron trioxide coverture, after standing 2-3min, skim, tapping casting becomes fritter cooling.
1.2 get one end opening part stopper of an aluminum rectangular tube material that needs bending forming or directly welding carry out tight sealing, will seal end face extremely under, and in from upper open end toward tubing, add low-melting alloy solid block, add to apart from openend 5-10mm.Tubing is tilted to be placed in heater, and heating-up temperature is 100 ℃, and progressively heating from below to up, makes low-melting alloy fusing.After low-melting alloy melts completely, stop heating, tubing is vertically placed in to air cooling.Until after the complete cooled and solidified of low-melting alloy, aforementioned tubes is clamped in and on stretch benders, does stretch wrap forming.
After 1.3 forming tubular products, be placed in boiling water and allow low-melting alloy automatically flow out, then use steam flush, until low-melting alloy is all removed.Proofread and correct tubing, incising pipes two ends surplus, completes forming tubular product manufacture, and product is qualified.
Embodiment 2
The material that the present embodiment is applied to bending forming is the circular tubing of a kind of aluminium alloy, and diameter is 13.6mm, and wall thickness is 1mm, and length is 1.5m, as shown in Figure 2.Low-melting alloy composition is cadmium 8%, lead 18%, and tin 24%, bismuth 50%, fusing point 70 is spent.Its bending forming concrete steps are as follows:
2.1 prepare low-melting alloy, concrete grammar is as follows: open melting resistance furnace, the each component metals raw material (purity is more than 99.9%) that configure are placed in to resistance furnace crucible, sprinkle diboron trioxide as coverture, resistance furnace temperature is transferred to 400 ℃-500 ℃, after metal in crucible all melts, stir melt 1-2min, dross on surface of fusant is pulled out and again sprinkled diboron trioxide coverture, after standing 2-3min, skim, tapping casting becomes fritter cooling.
2.2 get one end opening part stopper of the circular tubing of the aluminium alloy that needs bending forming or directly welding carry out tight sealing, will seal end face extremely under, and in from upper open end toward tubing, add low-melting alloy solid block, add to apart from openend 5-10mm.Tubing is tilted to be placed in heater, and heating-up temperature is 100 ℃, and progressively heating from below to up, makes low-melting alloy fusing.After low-melting alloy melts completely, stop heating, tubing is vertically placed in to air cooling.Until after the complete cooled and solidified of low-melting alloy, above-mentioned parts fixation is done to rotary draw bending on the machine of going for a stroll.
2.3 remove low-melting alloy from the part processing, and concrete grammar is: after part forming, be placed in boiling water and allow low-melting alloy automatically flow out, then use steam flush, until low-melting alloy is all removed.Proofread and correct part, cutting parts two ends surplus, completes part forming manufacture, and product is qualified.
Claims (2)
1. a method for aluminium alloy pipe bending forming, is characterized in that, carries out as follows:
(1) by an end opening of aluminium alloy pipe to be processed with stopper or directly welding carry out tight sealing, sealing end is faced down, add low-melting alloy solid block in from upper end open toward tubing, add to apart from openend 5-10mm;
(2) tubing is tilted to be placed in heater, heating-up temperature is 100 ℃, and progressively heating from below to up, makes low-melting alloy fusing;
(3) after low-melting alloy melts completely, stop heating, tubing is vertically placed in to air cooling;
(4) to the complete cooled and solidified of low-melting alloy, aforementioned tubes is clamped in to stretch bending or the machine of going for a stroll on stretch bending or rotary draw bending;
(5) after forming tubular product, be placed in boiling water and allow low-melting alloy automatically flow out, then use steam flush, until low-melting alloy is all removed;
(6) proofread and correct tubing, incising pipes two ends surplus, completes forming tubular product manufacture.
2. the method for aluminium alloy pipe bending forming according to claim 1, is characterized in that, the tin of the cadmium that described low-melting alloy is 6-8% by mass fraction, the lead of 17-19%, 22-25%, the zinc of 0-3%, surplus bismuth form; Its preparation method is: open melting resistance furnace, each component metals raw material that the purity configuring is more than 99.9% are placed in resistance furnace crucible, sprinkle coverture, resistance furnace temperature is transferred to 400 ℃-500 ℃, after metal in crucible all melts, stir melt 1-2min, dross on surface of fusant is pulled out and again sprinkled coverture, after leaving standstill 2-3min, skim, tapping casting becomes fritter cooling.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105327990A (en) * | 2015-11-23 | 2016-02-17 | 宁波思明汽车科技股份有限公司 | Alloy filling device for pipe bending and filling method thereof |
| CN105328423A (en) * | 2015-12-09 | 2016-02-17 | 贵州黎阳航空动力有限公司 | Processing method of thin-wall slender shaft parts |
| CN105396917A (en) * | 2015-12-02 | 2016-03-16 | 成都锦江电子系统工程有限公司 | Bending processing method for small-caliber thin-wall waveguide tube |
| CN105436270A (en) * | 2015-12-11 | 2016-03-30 | 北京有色金属研究总院 | Method for machining metal pipe with tapered elbow |
| CN105642721A (en) * | 2016-01-11 | 2016-06-08 | 淮安娇子金属科技有限公司 | High-frequency heating bending technology for titanium alloy workpiece |
| CN106086550A (en) * | 2016-07-21 | 2016-11-09 | 辽宁忠旺集团有限公司 | The production technology of 6061 aluminium alloy stretch bending section bars |
| CN106141546A (en) * | 2016-08-28 | 2016-11-23 | 常德翔宇设备制造有限公司 | Welding tooling and the method for part die cavity filled by a kind of low-melting-point metal |
| CN106378369A (en) * | 2016-10-21 | 2017-02-08 | 上海航天设备制造总厂 | Hot bending molding temperature indication paste for aluminum alloy tubular product and bending molding method |
| CN106734434A (en) * | 2017-01-11 | 2017-05-31 | 辽宁程威塑料型材有限公司 | The filler and method of a kind of aluminium alloy pipe bending forming |
| CN106756419A (en) * | 2015-11-23 | 2017-05-31 | 宁波思明汽车科技股份有限公司 | The preparation method of automobile bend pipe |
| CN106756134A (en) * | 2015-11-23 | 2017-05-31 | 宁波思明汽车科技股份有限公司 | A kind of preparation method of automobile bend pipe |
| CN109070170A (en) * | 2016-07-12 | 2018-12-21 | 三菱重工业株式会社 | The manufacturing method and plug of tubing |
| CN109128698A (en) * | 2018-08-23 | 2019-01-04 | 贵州永红航空机械有限责任公司 | A kind of processing method and portable tooling of thin-walled small diameter tube high temperature alloy pipe |
| CN109759776A (en) * | 2019-03-29 | 2019-05-17 | 上海摩软通讯技术有限公司 | A kind of production method and mobile terminal of the mesh base parts of mobile terminal |
| CN111468634A (en) * | 2020-04-16 | 2020-07-31 | 北京航天科颐技术有限公司 | Integral thermal forming method for aircraft engine flow guide pipe |
| CN112404897A (en) * | 2020-11-03 | 2021-02-26 | 哈尔滨飞机工业集团有限责任公司 | Method for processing slender pipe parts |
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| JPS589723A (en) * | 1981-07-10 | 1983-01-20 | Mitsubishi Electric Corp | Bending method for metallic pipe |
| JPH05104152A (en) * | 1991-10-08 | 1993-04-27 | Furukawa Alum Co Ltd | Method for bending shape |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105327990A (en) * | 2015-11-23 | 2016-02-17 | 宁波思明汽车科技股份有限公司 | Alloy filling device for pipe bending and filling method thereof |
| CN106756134A (en) * | 2015-11-23 | 2017-05-31 | 宁波思明汽车科技股份有限公司 | A kind of preparation method of automobile bend pipe |
| CN106756419A (en) * | 2015-11-23 | 2017-05-31 | 宁波思明汽车科技股份有限公司 | The preparation method of automobile bend pipe |
| CN105396917A (en) * | 2015-12-02 | 2016-03-16 | 成都锦江电子系统工程有限公司 | Bending processing method for small-caliber thin-wall waveguide tube |
| CN105328423A (en) * | 2015-12-09 | 2016-02-17 | 贵州黎阳航空动力有限公司 | Processing method of thin-wall slender shaft parts |
| CN105436270A (en) * | 2015-12-11 | 2016-03-30 | 北京有色金属研究总院 | Method for machining metal pipe with tapered elbow |
| CN105642721A (en) * | 2016-01-11 | 2016-06-08 | 淮安娇子金属科技有限公司 | High-frequency heating bending technology for titanium alloy workpiece |
| CN109070170A (en) * | 2016-07-12 | 2018-12-21 | 三菱重工业株式会社 | The manufacturing method and plug of tubing |
| US11167335B2 (en) | 2016-07-12 | 2021-11-09 | Mitsubishi Heavy Industries, Ltd. | Method for producing pipe material |
| CN106086550A (en) * | 2016-07-21 | 2016-11-09 | 辽宁忠旺集团有限公司 | The production technology of 6061 aluminium alloy stretch bending section bars |
| CN106141546A (en) * | 2016-08-28 | 2016-11-23 | 常德翔宇设备制造有限公司 | Welding tooling and the method for part die cavity filled by a kind of low-melting-point metal |
| CN106378369A (en) * | 2016-10-21 | 2017-02-08 | 上海航天设备制造总厂 | Hot bending molding temperature indication paste for aluminum alloy tubular product and bending molding method |
| CN106378369B (en) * | 2016-10-21 | 2020-07-17 | 上海航天设备制造总厂 | Aluminum alloy pipe hot bending forming temperature indication paste and bending forming method |
| CN106734434A (en) * | 2017-01-11 | 2017-05-31 | 辽宁程威塑料型材有限公司 | The filler and method of a kind of aluminium alloy pipe bending forming |
| CN109128698A (en) * | 2018-08-23 | 2019-01-04 | 贵州永红航空机械有限责任公司 | A kind of processing method and portable tooling of thin-walled small diameter tube high temperature alloy pipe |
| CN109759776A (en) * | 2019-03-29 | 2019-05-17 | 上海摩软通讯技术有限公司 | A kind of production method and mobile terminal of the mesh base parts of mobile terminal |
| CN111468634A (en) * | 2020-04-16 | 2020-07-31 | 北京航天科颐技术有限公司 | Integral thermal forming method for aircraft engine flow guide pipe |
| CN111468634B (en) * | 2020-04-16 | 2022-02-25 | 北京航天科颐技术有限公司 | Integral thermal forming method for aircraft engine flow guide pipe |
| CN112404897A (en) * | 2020-11-03 | 2021-02-26 | 哈尔滨飞机工业集团有限责任公司 | Method for processing slender pipe parts |
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Application publication date: 20140618 |