CN101224490A - Continuous rheological extending forming method for preparing Al alloy tube - Google Patents
Continuous rheological extending forming method for preparing Al alloy tube Download PDFInfo
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Abstract
The invention relates to a continuous rheological extension forming method used for preparing an aluminium alloy pipe. The invention adopts a continuous extension forming device which mainly consists of a water cooling rotation roller, a fixed shoe plate, an extrusion forming die, a back pressing block and a base. The key point is that the invention is achieved by the steps that the chemical ingredients of the invention are 0.8% of an Mg, 0.7% of a Si, less than or equal to 0.1% of total impurity, and an Al with the residual quantity according to the mass percentage; a melting furnace is pre-heated to 700 DEG C when an aluminium ingot is added; an Al-Si master alloy is added when the temperature is 760 DEG C; the Mg is pressed into the melting body when the temperature is reduced to 720 DEG C; a refining is achieved by a hexachloroethane when the temperature is increased to 740 DEG C; after that, the melting body is covered and the temperature is increased and kept at 760-800 DEG C; finally, the aluminium alloy pipe is prepared by the continuous extension forming device of the melting body. The pipe tissue is uniform and fine; the tensile strength of T6 state is 300MPa, the elongation thereof is 10% and the equivalent conductivity is 54.38IACS. The invention has the advantages of high efficiency, saving energy, short process flow and fast effect. The product of the invention becomes the conductive material which is urgently required by power industry.
Description
Technical field
The present invention relates to a kind of preparation method of aluminium-alloy pipe, be specifically related to a kind of preparation aluminium-alloy pipe continuous rheological extending forming preparation method.
Technical background
The short flow process forming technique of metal semi-solid is the important topic in the new material scientific domain, meets the requirement of national economy sustainable development.Semi-solid metal forming has broken through metal in traditional liquid or solid-state interval many drawbacks that are shaped, it is a kind of energy-efficient nearly end form new technology, be described as the green industrial technology of tool application prospect of 21 century, countries in the world are dropped into a large amount of manpower and materials and are studied.1971, professor Flemings of Massachusetts Institute Technology at first proposed the semi-solid metal forming technology.At present, many patented technologies have been carried out fairly large commercially producing abroad.Early 1980s, China carried out the research of semi-solid state forming technique, had obtained many achievements in research, also had certain gap but compare with external advanced level, and commercial Application is still immature.
At present, the external semi-solid state forming technique of commercially producing that drops into mainly contains: screw machine stirring technique, electromagnetic agitating technology, spray deposition technique and strain inducing melt activating technology etc.; Aspect forming technology, mainly adopt thixotropic forming.Mainly be because pulp preparation, accumulating conveying and control etc. relatively easily realize in the thixotropic forming, become main semisolid production technology.In semi-solid rheological molding, pulp preparation, accumulating conveying, solid rate control require high, the enterprise staff technical merit is limited, higher cost utilization mature technique very not still also is reluctant to drop into by enterprise, becomes and hinders the important bottleneck of rheological molding technology in global large-scale promotion.Although the thixotropic forming flow process shortens greatly than traditional work flow, but remaining, base, heating and three links that are shaped independently separate, the rheological molding flow process is still longer relatively, how to adopt the rheological molding technology, slurrying and progressive forming are combined, realize that one step forming is the target that numerous experts and scholars pursue at present.Develop convenient and swift, be easy to industrialization, low energy consumption, the continuous flow forming technology is one of present material forming field primary study content cheaply.
Based on above research, continuous casting and extrusion technology (Castex) has been proposed, it is further developing of continuously extruded technology (Conform), the liquid metal continuous casting is integrated with processing, realize that liquid metal directly shapes, belong to short flow process, energy-efficient advanced technologies.1971, the Derek Green of British Atomic Energy Authority proposed continuously extruded first, and adopting aluminium bar material or particulate material is raw material, squeegee roller drive by rotation enters in the extruding die cavity, under extruding force and temperature action, metal is extruded nib, carry out the extrusion die design according to the requirement of product.Conform continuous extruder and secondary process equipment have constituted the continuous extrusion production line, auxiliary equipment is installed in the front and back of extruder, what and complexity of auxiliary equipment depends on the specification requirement of product, and this production line can produce solid and hollow profile, wire rod and cladding material.On the continuously extruded basis of Conform, through a large amount of experimental studies, Britain Holton company improves continuous extruder, adopt liquid metal to make raw material and directly enter main frame, casting is squeezed wheel and is formed the extruding die cavity with fixing boots seat, and liquid metal carries out crystallization and distortion in die cavity, be extruded nib then and become a useful person, forming casting (Casting) is the novel extrusion technique of one with extruding (Extrusion), and has declared patent of invention.The continuous casting and extrusion technology is compared with the conventional plastic processing method of producing like product, has following advantage: can produce very long product continuously; Energy savings is about 40%, and yield rate is up to 90%, and it is about more than 30% to reduce cost; Product precision height, any surface finish is smooth; Compact equipment is invested little; Environmental pollution is little.In the 70-80 age in 20th century, Britain Holton company has produced three continuous casting and extrusion machines.China classified the continuous casting and extrusion technology as " the Seventh Five-Year Plan " brainstorm subject in 1986, this research is the advanced subject of metallurgical industry development, the new technology that belongs to short flow process, energy-efficient, high benefit, Northeastern University has born this important function for of research task, nineteen ninety succeeds in developing, and has declared national inventing patent.The domestic unit that has several families to study continuously extruded technology (Conform), but liquid casting is squeezed Study on Technology unit seldom.Northeastern University is in the level that is in a leading position at home aspect the continuous casting and extrusion technological know-how property right always, and people such as professor Huo Wencan of Harbin Institute of Technology also once did single rolling and squeeze the research work such as grade, had obtained some achievements in research.
The research department is in advanced level in single roller shearing cooling preparation semi-solid material technical field in Tokyo Univ Japan's wood, they have proposed single roller in 1998 based on the continuous casting and extrusion technology and have sheared cooling preparation semi-solid metal slurry, successfully prepare the good semi-solid metal slurry of structure property, but the progressive forming of this technology is not further studied.The researcher of Northeastern University has carried out aluminium alloy continuous casting and extrusion device, theory and technical study, liquid phase region, semisolid district and solid phase area have been found to exist in the continuous casting and extrusion process, and proposition " three districts " theory, the project of metal semi-solid extruding was proposed at the end of the nineties, on this basis, propose single roller again and shear the research that cooling technology prepares semi-solid-state metal and extension forming, make important progress, tentatively set up the pilot experiment research platform of the continuous flow forming of aluminium, magnesium alloy materials.
Summary of the invention
The objective of the invention is on the basis of above-mentioned prior art, a kind of extension forming technology is provided, the method for the continuous rheological extending forming of preparation aluminium-alloy pipe reaches and shortens flow process, efficient, energy-conservation and material-saving, and improves the structure property of goods.
The technical scheme of implementing the object of the invention is: utilize mainly by water-cooled and rotate roll, fixing boots seat, the Continuous Extending Forming device of mold for extruding and forming, back pressure piece and pedestal composition prepares aluminium-alloy pipe, and main points are to carry out as follows:
(1): with purity is the industrial aluminum of 99.99wt%, and Al-Si intermediate alloy and purity are that the commercial magnesium of 99.99wt% is an alloy raw material, and chemical composition is 0.8% by mass fraction: Mg, and Si is 0.7%, impurity summation≤0.1%, and surplus is Al;
(2): melting furnace is preheating to 700 ℃, adds earlier the aluminium ingot fusing, behind the smelting temperature to 760 ℃, add the Al-Si intermediate alloy, after melt temperature drops to 720 ℃, the magnesium after the oven dry is pressed in the melt;
(3): behind above-mentioned metal molten, when the control temperature reaches 740 ℃, use the carbon trichloride refining; Then
(4): the metal bath after the refining is covered, after the temperature raising to 760 ℃ fast～800 ℃, insulation 15min; At last
(5): metal bath through the Continuous Extending Forming device, is produced aluminium-alloy pipe.
The carbon trichloride that adds alloying component total amount 0.2～0.5wt% in above-mentioned steps (3) refining process carries out refining.
After above-mentioned steps (4) refining finishes, the alloy melt after purifying is covered with insulation quilt.
When alloy melt is produced aluminium-alloy pipe through the Continuous Extending Forming device, the control roll rotational speed is 10～15 commentaries on classics/min, and cooling water flow is 15～25L/min, and roller boots gap is 1～1.5mm, outlet cooling water flow 20～40L/min, mold preheating temperature is 500 ℃～550 ℃.The aluminium-alloy pipe that alloy melt is produced through the Continuous Extending Forming device is 6201 aluminium alloy pipes of Φ 60～80mm * 5mm.
The present invention has following characteristics and significant good effect compared with the prior art:
(1) to continuous casting and extrusion (Castex), shear further improving and development of cooling preparation semi-solid material (SCR) and rheological molding technology.With slurry prepare continuously, continuous flow forming organically combines, and realizes the integrated and serialization of rheological molding.Adopt the liquid material directly to prepare high-performance aluminium alloy tubing continuously.
(2) adopt the semi-solid rheological extension forming to produce aluminium tube, energy-efficient, little, the instant effect of investment.Reduce cost energy-saving material-saving greatly.Compare with traditional casting-rolling, extruding-drawing technique, adopt present technique escapable cost more than 30%, lumber recovery to reach more than 95%, cut down the consumption of energy more than 40%, the production efficiency of unit continuous flow forming aluminium alloy is no less than 110Kg/h.Especially to solving problems such as the technological process of present production conduction material is long, investment is high, device systems is huge, energy consumption is high, lumber recovery is low, has outstanding advantage.Present technique and the contrast of traditional processing technology flow process are as shown in table 1:
The technology contrast of table 1 present technique technology and traditional mode of production conduction tubing
| Preparation technology | Technological process |
| Traditional handicraft present technique technology | Melting → strand → (hot rolling) → extruding → drawing → heat treatment melting → CSEP and on-line solution timeliness |
(3) the goods structure property is good.Since under the rubbing effect of the strong shearing cooling of roll, formed the brilliant tissue of fine spherical grains, superior through continuous flow forming goods structure property.Problems such as simultaneously, the rheological molding mold filling is easy, and it is inhomogeneous to have avoided being shaped make the product structure property good.The 6201 alloy wire tensile strength and the electrical conductivity of preparation improve 11.1% and 1% respectively than national standard (JB/T8640-1997).
(4) tubing of production theory endless continuously: conventionally produce limited length after the strand blanking, product that can only the production limited length when rolling and extruding, and to conduction tubing, joint has big adverse effect to electric conductivity.Therefore, the conduction tubing that the present invention produces endless continuously is highly beneficial to the conduction and the mechanical property that improve material, has saved material simultaneously.
Description of drawings
Fig. 1 is an apparatus structural representation of the present invention;
Fig. 2 is a principle schematic of the present invention;
Fig. 3 is that the present invention expands extrusion die combination schematic diagram;
Fig. 4 is the present invention 6201 aluminium alloy pipe micro-organization charts;
Among the figure 1, fixing boots seat, 2, extended cavity, 3, mold for extruding and forming, 4, fill material mouthful, 5, pedestal, 6, cooling chamber, 7, roller shell, 8, alloy liquid, 9, semisolid, 10, small-bore filling, 11, tubing, 12, extended cavity, 13, formpiston, 14, former
The specific embodiment
Embodiment 1: continuous rheological extending forming machine of the present invention (having declared number of patent application is 200720185231X, and the applying date is 2007-12-27), and as Fig. 1, shown in Figure 3.The operation principle of its preparation aluminium alloy pipe, as shown in Figure 2.This device mainly rotates roll by the water-cooled that cooling chamber and roller shell are formed, extrusion molding dies, and the back pressure piece, rack-mounted fixedly boots seat and stripper constitute.Alloy melt is poured into a mould at top, roller boot last chamber inlet, and by the frictional force that the rotary work roller applies, alloy melt is pulled into roller boot last chamber, in roller boot last chamber, alloy melt is cooled off gradually, is rotated the working roll shear agitation simultaneously, the final aluminium alloy pipe that forms, its concrete steps are as follows:
(1) with purity be the 99.99wt% industrial aluminum, Al-Si intermediate alloy and purity are alloy materials for the 99.99wt% commercial magnesium, prepare 6201 alloys, and its main chemical compositions (mass fraction) is Mg0.8%, Si0.7%, impurity summation=0.1%, Al surplus;
(2) melting furnace is preheating to 700 ℃, substep adds the fine aluminium ingot and carries out heat fused, behind the smelting temperature to 760 ℃, adds the Al-Si intermediate alloy, treat that melt cools to 720 ℃ after, the pure magnesium that preliminary treatment is finished is pressed in the melt;
(3) behind metal molten, with JWK-702 precision temperature switch board (product of purchasing) control melt temperature, when temperature reaches 740 ℃, with 0.2% carbon trichloride refining;
(4) after degasification slagging-off finishes, the melt after purifying is covered with insulation quilt, and fast after the temperature raising to 760 ℃, insulation 15min;
(5) on DZJ350 Continuous Extending Forming machine, by control roll rotational speed 10r/min, roller groove cooling water flow 15L/min, roller boots gap 1mm, outlet cooling water flow 20L/min, mold preheating temperature 500C prepares 6201 aluminium alloy pipes of Φ 60mm * 5mm.
The final properties test result: the tensile strength of T6 attitude reaches 290MPa, percentage elongation 9%, equivalent conductivity 52.5IACS.
Embodiment 2: the device of this example is identical with embodiment 1, adopts this device to produce the technology of 6201 aluminium alloy pipes, comprises the steps:
(1) with purity be the 99.99wt% industrial aluminum, Al-Si intermediate alloy and purity are alloy materials for the 99.99wt% commercial magnesium, prepare 6201 alloys, and its main chemical compositions (mass fraction) is Mg0.8%, Si0.7%, impurity summation=0.1%, Al surplus;
(2) melting furnace is preheating to 700 ℃, substep adds the fine aluminium ingot and carries out heat fused, behind the smelting temperature to 760 ℃, adds the Al-Si intermediate alloy, treat that melt cools to 720 ℃ after, the pure magnesium that preliminary treatment is finished is pressed in the melt;
(3) behind metal molten, with JWK-702 precision temperature switch board control melt temperature, when temperature reaches 740 ℃, with 0.3% carbon trichloride refining;
(4) after degasification slagging-off finishes, the melt after purifying is covered with insulation quilt, and fast after the temperature raising to 780 ℃, insulation 15min;
(5) on DZJ350 Continuous Extending Forming machine, by control roll rotational speed 13r/min; Roller groove cooling water flow 20L/min; Roller boots gap 1.3mm; Outlet cooling water flow 30L/min, 520 ℃ of mold preheating temperatures can prepare 6201 aluminium alloy pipes of Φ 60mm * 5mm.
The final properties test result: the tensile strength of T6 attitude reaches 300MPa, percentage elongation 10%, equivalent conductivity 54.38IACS.
Embodiment 3: the device of this example is identical with embodiment 1, adopts this device to produce the technology of 6201 aluminium alloy pipes, carries out as follows:
(1) with purity be the 99.99wt% commercial-purity aluminium, Al-Si intermediate alloy and purity are alloy materials for the 99.99wt% pure magnesium, prepare 6201 alloys, its main chemical compositions (mass fraction) is Mg0.8%, Si0.7%, impurity summation=0.1%, Al surplus;
(2) melting furnace is preheating to 700 ℃, substep adds the fine aluminium ingot and carries out heat fused, behind the smelting temperature to 760 ℃, adds the Al-Si intermediate alloy, treat that melt cools to 720 ℃ after, the pure magnesium that preliminary treatment is finished is pressed in the melt;
(3) behind metal molten, with JWK-702 precision temperature switch board control melt temperature, when temperature reaches 740 ℃, with 0.5% carbon trichloride refining;
(4) after degasification slagging-off finishes, the melt after purifying is covered with insulation quilt, and fast after the temperature raising to 800 ℃, insulation 15min;
(5) on DZJ350 Continuous Extending Forming machine, by control roll rotational speed 15r/min; Roller groove cooling water flow 25L/min; Roller boots gap 1.5mm; Outlet cooling water flow 40L/min, 550 ℃ of mold preheating temperatures can prepare 6201 aluminium alloy pipes of Φ 80mm * 5mm.
The final properties test result: the tensile strength of T6 attitude reaches 320MPa, percentage elongation 12%, equivalent conductivity 56.7IACS.
Claims (5)
1. continuous rheological extending forming method for preparing aluminium-alloy pipe, select for use mainly by water-cooled rotate roll, fixedly the Continuous Extending Forming device formed of boots seat, mold for extruding and forming, back pressure piece and pedestal prepares aluminium-alloy pipe, it is characterized in that carrying out as follows:
(1): with purity is the industrial aluminum of 99.99wt%, and Al-Si intermediate alloy and purity are that the commercial magnesium of 99.99wt% is an alloy raw material, and chemical composition is 0.8% by mass fraction: Mg, and Si is 0.7%, impurity summation≤0.1%, and surplus is Al;
(2): melting furnace is preheating to 700 ℃, adds earlier the aluminium ingot fusing, behind the smelting temperature to 760 ℃, add the Al-Si intermediate alloy, after melt temperature drops to 720 ℃, the magnesium after the oven dry is pressed in the melt;
(3): behind above-mentioned metal molten, when the control temperature reaches 740 ℃, use the carbon trichloride refining; Then
(4): the metal bath after the refining is covered, after the temperature raising to 760 ℃ fast～800 ℃, insulation 15min; At last
(5): metal bath through the Continuous Extending Forming device, is produced aluminium-alloy pipe.
2. according to the continuous rheological extending forming method of the described preparation aluminium-alloy pipe of claim 1, it is characterized in that the carbon trichloride that adds alloying component total amount 0.2～0.5wt% in step (3) refining process carries out refining.
3. according to the continuous rheological extending forming method of the described preparation aluminium-alloy pipe of claim 1, it is characterized in that step (4) refining finishes after, the alloy melt after purifying is covered with insulation quilt.
4. according to the continuous rheological extending forming method of the described preparation aluminium-alloy pipe of claim 1, when it is characterized in that alloy melt is produced aluminium-alloy pipe through the Continuous Extending Forming device, the control roll rotational speed is 10～15 commentaries on classics/min, cooling water flow is 15～25L/min, roller boots gap is 1～1.5mm, outlet cooling water flow 20～40L/min, mold preheating temperature is 500 ℃～550 ℃.
5. according to the continuous rheological extending forming method of claim 1 or 4 described preparation aluminium-alloy pipes, it is characterized in that the aluminium-alloy pipe that alloy melt is produced through the Continuous Extending Forming device is 6201 aluminium alloy pipes of Φ 60～80mm * 5mm.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890485A (en) * | 2010-06-08 | 2010-11-24 | 东北大学 | Continuous casting and extrusion forming method for magnesium alloy bar/wire rod |
| CN101786113B (en) * | 2010-01-25 | 2012-08-01 | 东北大学 | Preparation method of Al-based alloy core wire |
| CN105057627A (en) * | 2015-08-05 | 2015-11-18 | 苏州好洁清洁器具有限公司 | Preparation method of composite aluminum alloy tube |
| CN105057614A (en) * | 2015-09-02 | 2015-11-18 | 无锡通用钢绳有限公司 | Continuous efficient blank making device for high-speed rail contact line |
| CN105855489A (en) * | 2016-03-31 | 2016-08-17 | 管仁国 | Multi-line-groove continuous forming device and method for liquid metal |
| CN106180606A (en) * | 2016-09-14 | 2016-12-07 | 云南锡业锡材有限公司 | One has core scolding tin bar continuous casting and extrusion system of processing and moulding process thereof |
| CN108265201A (en) * | 2018-02-08 | 2018-07-10 | 西北工业大学 | A kind of high-ductility Al-Mg-Sn alloys and preparation method |
| CN108500223A (en) * | 2018-03-09 | 2018-09-07 | 张家港立志传导新材料有限公司 | A kind of supercharging device in mg-based material continuous casting and extrusion equipment |
| CN108796312A (en) * | 2018-07-16 | 2018-11-13 | 东北大学 | A kind of preparation method of the aluminium alloy containing spherical nanometer phase containing Fe |
| CN110961596A (en) * | 2019-10-18 | 2020-04-07 | 安徽枫慧金属股份有限公司 | System for preparing low-cost high-performance extrusion casting aluminum alloy by utilizing secondary aluminum |
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- 2008-01-31 CN CNA2008100103036A patent/CN101224490A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786113B (en) * | 2010-01-25 | 2012-08-01 | 东北大学 | Preparation method of Al-based alloy core wire |
| CN101890485A (en) * | 2010-06-08 | 2010-11-24 | 东北大学 | Continuous casting and extrusion forming method for magnesium alloy bar/wire rod |
| CN101890485B (en) * | 2010-06-08 | 2012-02-22 | 东北大学 | Continuous casting and extrusion forming method for magnesium alloy bar/wire rod |
| CN105057627A (en) * | 2015-08-05 | 2015-11-18 | 苏州好洁清洁器具有限公司 | Preparation method of composite aluminum alloy tube |
| CN105057614A (en) * | 2015-09-02 | 2015-11-18 | 无锡通用钢绳有限公司 | Continuous efficient blank making device for high-speed rail contact line |
| CN105855489A (en) * | 2016-03-31 | 2016-08-17 | 管仁国 | Multi-line-groove continuous forming device and method for liquid metal |
| CN106180606A (en) * | 2016-09-14 | 2016-12-07 | 云南锡业锡材有限公司 | One has core scolding tin bar continuous casting and extrusion system of processing and moulding process thereof |
| CN108265201A (en) * | 2018-02-08 | 2018-07-10 | 西北工业大学 | A kind of high-ductility Al-Mg-Sn alloys and preparation method |
| CN108500223A (en) * | 2018-03-09 | 2018-09-07 | 张家港立志传导新材料有限公司 | A kind of supercharging device in mg-based material continuous casting and extrusion equipment |
| CN108796312A (en) * | 2018-07-16 | 2018-11-13 | 东北大学 | A kind of preparation method of the aluminium alloy containing spherical nanometer phase containing Fe |
| CN110961596A (en) * | 2019-10-18 | 2020-04-07 | 安徽枫慧金属股份有限公司 | System for preparing low-cost high-performance extrusion casting aluminum alloy by utilizing secondary aluminum |
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