CN101181771A - Extruding-bending integral forming method for magnesium alloy profiles - Google Patents
Extruding-bending integral forming method for magnesium alloy profiles Download PDFInfo
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- CN101181771A CN101181771A CNA200710171857XA CN200710171857A CN101181771A CN 101181771 A CN101181771 A CN 101181771A CN A200710171857X A CNA200710171857X A CN A200710171857XA CN 200710171857 A CN200710171857 A CN 200710171857A CN 101181771 A CN101181771 A CN 101181771A
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Abstract
The invention relates to a technical method used for extruding-bending-integral forming of a magnesium alloy sectional material, pertaining to the technical field of plasticity processing. A set of three-wheel roll bending device is arranged near a discharge port of the original horizontal extruding machine, magnesium alloy ingot blanks are molded into the sectional material through hot extrusion, the sectional material is put into the roll bending mechanism directly before being cooled, bending moment is carried out to the sectional materials by the three roll wheels that are arranged on a same surface so as to achieve bending and molding, and the movement and position of the roll wheels are controlled to gain a bending angle and a bending radius that are required. The invention can realize the extrusion, bending and continuous molding of the magnesium alloy sectional material under the condition of only heating original ingot blanks, thereby having high production efficiency and low cost.
Description
Technical field
The present invention relates to the manufacturing process in a kind of Technology of Plastic Processing field, specifically is a kind of extruding-bending integral forming method for magnesium alloy profiles.
Background technology
Magnesium alloy is applied to fields such as machinery, automobile, electronics and Aero-Space just gradually as the lightest up to now structural metallic materials, has shown great application prospect.The actual at present magnesium alloy parts that use are mainly based on die casting, because the intrinsic shortcoming of casting technique, make it can not satisfy intensity and dimensional requirement under the multiple occasion, wrought magnesium alloy is owing to have plurality of advantages such as dense structure, size is flexible, comprehensive mechanical property is good, therefore can satisfy the instructions for use of multiple structural member, develop wrought magnesium alloy and process technology has great importance.Magnesium alloy deformation processing technology commonly used has secondary processing methods such as extruding, forging, preliminarily forming method such as rolling and bending subsequently, punching press, hydraulic expanding-forming, extruding is that metal stock is out of shape under the three-dimensional compressive stress state, can give full play to the plasticity of metal stock, for the relatively poor magnesium alloy of plastic deformation ability, extrusion process is more much easier with forging than rolling.In addition, extrusion process can crystal grain thinning, can improve intensity, can obtain good surface quality and stable dimensional accuracy by keeping extrusion fiber texture.Therefore, extrusion molding is one of main path of making wrought magnesium alloy, plastic deformation ability is poor at low temperatures owing to magnesium alloy, its extrusion process need at high temperature be carried out usually, hot extruded shapes dense structure, the surface quality of magnesium alloy are good, product dimensional accuracy height, section configuration variation, the comprehensive mechanical property excellence all has special advantages so the extrudate of magnesium alloy is applied to multiple structural member.Most of section bars all must carry out secondary formings such as bending machining before use according to actual needs, because the temperature-room type plasticity of magnesium alloy is very poor, therefore can not carry out cold bending according to the bending process of traditional material.Studies show that the plastic deformation ability of magnesium alloy can be significantly improved when temperature raises, think that the bending machining of its section bar must be carried out under hot adding, the problem of bringing thus is that production efficiency is low, and energy waste is very serious.Will when enhancing productivity, save a large amount of energy if can utilize the waste heat of section bar extruding to carry out continuous bending machining.Therefore, research and develop a kind of can under the situation of once heating, the realization pushing and the novel process of crooked progressive forming and an urgent demand and the development trend that equipment just becomes the extensive use of magnesium alloy extrudate.
Find through literature search prior art, a kind of Europatent (number of patent application: EP0706843B1 that is used to make the Processes and apparatus application of automobile frame bool, Method and device for theproduction of curved workpieces, title: the preparation method of bool and equipment), this method is the propelling sheave effect that the section bar extruded is directly had the certain movement track, the front end of section bar moves with propelling sheave, the section bar end is under the constraint at extrusion die discharging opening edge, form bool, because flexural deformation mainly occurs in the exit of extrusion die, therefore the wearing and tearing of mould are very serious, in addition, because strain rate is big during flexural deformation,, be difficult to guarantee the shape in bool cross section for the section bar of thin-walled cavity type.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of extruding-bending integral forming method for magnesium alloy profiles is provided, this method production efficiency height, energy savings, under the condition of once heating, can realize pushing carrying out simultaneously, be applicable to the extruding-bending integral progressive forming of various magnesium alloy profiles with bending.
The present invention is achieved by the following technical solutions, the present invention arranges a cover three-wheel roll bending device near the discharging opening of traditional horizontal extruder, magnesium alloy ingot blank forms section bar through hot extrusion, section bar directly entered three-wheel roll bending device before cooling, by three running rollers in the same plane section bar is applied moment of flexure, realize bending forming, the motion and the position of control running roller just can obtain required angle of bend and bending radius.
The present invention specifically may further comprise the steps:
(1) near the discharging opening of horizontal extruder, installs three running rollers that have groove additional, the shape of groove and the profile of extrusion profile coupling, three running rollers are by a cover hydraulic drive mechanism control, except that can do freely rotate, two running rollers wherein can carry out two in the plane to feed motion.
(2) magnesium alloy ingot blank and the mould to extruding usefulness carries out preheating, carries out conventional extrusion operation on extruder, adjusts the running roller position at extruder discharging opening place, and the section bar of extruding can be entered in the groove of three running rollers smoothly.
The mould of extruder and magnesium alloy extrusion billet must heat before extruding, for continuous production, mould only need just once heat before the dress, and extrusion speed should make the temperature of discharging shape of the mouth as one speaks material satisfy diastrophic needs satisfying under the prerequisite of extrusion molding.
(3) carry out the plane feed motion by two running rollers away from discharging opening in three running rollers of hydraulic drive mechanism control, adjust the angle of bend and the bending radius of section bar by the mutual spacing between three people's running rollers.
Extrusion temperature scope of the present invention is 300 ℃～400 ℃, and the extrusion speed scope is 10mm/s-100mm/s, and the temperature that section bar enters before the running roller is not less than 300 ℃, and the temperature behind the bending forming is not less than 150 ℃, and bending radius is greater than the twice of circular section section bar diameter.
Because the plastic working of magnesium alloy must be shaped under heating condition, the present invention only need carry out the heating of original ingot blank, extrusion die only carries out a preheating before installation, near the temperature of the section bar that squeezes out discharging opening can satisfy the requirement of bending forming fully, the no sliding injury in section bar surface after the shaping, the cross sectional shape deformation rate is little, straight section and bending section transition are even, the present invention can directly produce the specific magnesium alloy profiles with multiple radian by magnesium alloy ingot, can realize working continuously, its production efficiency can be adjusted by the extrusion speed of control extruder, be bent into example with the extruding of AZ31 tubing, minimum bending radius is less than 3 times external diameter of pipe, and the maximum reduction of tube wall is less than 10%, and the maximum ovality in cross section is less than 8%.
Description of drawings
Fig. 1 is the general flow chart of the embodiment of the invention
Wherein, 1. extrusion billet, 2. extrusion die, 3. extrudate, 4. first running roller, 5. second running roller, 6. the 3rd running roller, the 7. section bar after the flexural deformation.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the flow process of the embodiment that is provided:
(1) position of fixed press machine discharging opening place first running roller 4, groove in first running roller 4 can be fitted with the outer wall of extrusion profile, adjust the position of second running roller 5 and the 3rd running roller 6, the section bar extruded can be smoothly passed from the zone line of three running rollers, wherein the 3rd running roller 6 and first running roller 4 are positioned at a side of extrudate 3, and second running roller 5 is positioned at the opposite side of extrudate 3 correspondences.
(2) magnesium alloy extrusion billet 1 and extrusion die 2 are placed be warmed up to 300～400 ℃ in resistance furnace or the electromagnetic induction furnace, and be incubated.To pack in the extruder through the mould of preheating, from holding furnace, take out extrusion billet 1, pack into rapidly and carry out extrusion process in the recipient of extruder, guaranteeing under the extrudate 3 ganoid prerequisites of extruding, adjust the feed speed of pressure ram, make the temperature of discharging opening extrudate 3 be fit to bending forming.
(3) when the extrudate of extruding 3 needs crooked zone to enter between the running roller, according to setting startup running roller feeding program in advance, make second running roller 5 and the 3rd running roller 6 do feed motion in the direction of extrusion along perpendicular or parallel, section bar with higher temperature forms the magnesium alloy profiles with specific curvature, i.e. section bar after the flexural deformation 7 under the moment of flexure effect that three running rollers apply jointly.By adjusting angle of bend and the bending radius that magnesium alloy profiles just can be controlled in relative motion between three running rollers 4,5,6 and position, under the certain situation of extrusion speed, the time that 4,5,6 pairs of section bars of three running rollers apply moment has continuously determined the length of same segmental arc, and the relative position of three running rollers 4,5,6 has determined the radius of curvature of crooked segmental arc.
Embodiment 1
The magnesium alloy trade mark that this example adopts is AZ31, and the section bar of extruding is diameter 42mm, the pipe of wall thickness 4mm, the diameter of three running rollers is 150mm, thickness is 50mm, and it is the semi-circular recesses of 21mm that its outer circumference has radius, adopts the shunting extrusion, the diameter of starting ingot is 100mm, the preheat temperature of blank and mould is 350 ℃, temperature retention time 10 minutes, and extrusion speed is 50mm/s, the temperature of extruder discharging opening place tubing is 310 ℃, and the temperature after the flexural deformation is 210 ℃; Tube surfaces after the shaping does not have sliding injury, does not have cracking, wrinkle resistant, and the bending curvature radius is 200mm, and the thickest reduction is 8%, and the maximum ovality in cross section is 7%.
Embodiment 2
This example adopts the AM30 magnesium alloy, makes wide 120mm, the sheet material of thick 6mm, the diameter of three running rollers is 100mm, thickness is 130mm, and the periphery of running roller has the wide 120mm that is, is the rectangular recess of 2mm deeply, the starting ingot diameter that adopts is 100mm, blank is preheating to 300 ℃ with stove with corresponding extrusion die in resistance furnace, be incubated 10 minutes, and extrusion speed is adjusted into 100mm/s, the temperature of extruder discharging opening place sheet material is 340 ℃, and the temperature after the flexural deformation is 220 ℃; The back plate surface that is shaped is smooth, crooked extrados flawless, and intrados is wrinkle resistant, the shape of cross section no change, final bending curvature radius is 180mm.
Embodiment 3
This example adopts the AM50 magnesium alloy, making diameter is the bar of 30mm, the diameter of three running rollers is 150mm, and thickness is 40mm, and it is the arc groove of 15mm that its outer circumference has radius, the diameter of starting ingot is 100mm, be heated to 400 ℃ with stove together with corresponding extrusion die, be incubated 10 minutes, extrusion speed is adjusted into 10mm/s, the surface temperature of extruder discharging opening place bar is 350 ℃, and the temperature after the flexural deformation is 190 ℃; Bar surface quality after final the shaping is good, the dimensional accuracy height, and the curved outside flawless, curved interior does not have rugosity, and the maximum ovality in cross section is less than 2%, and crooked mean radius of curvature is 150mm.
Claims (7)
1. extruding-bending integral forming method for magnesium alloy profiles, it is characterized in that, near the discharging opening of horizontal extruder, arrange a cover three-wheel roll bending device, magnesium alloy ingot blank forms section bar through hot extrusion, section bar directly entered three-wheel roll bending device before cooling, by three running rollers in the same plane section bar is applied moment of flexure, realize bending forming, the motion and the position of control running roller obtain required angle of bend and bending radius.
2. extruding-bending integral forming method for magnesium alloy profiles according to claim 1 is characterized in that, may further comprise the steps:
(1) near the discharging opening of horizontal extruder, installs three running rollers that have groove additional, the shape of groove and the profile of extrusion profile coupling, three running rollers are by a cover hydraulic drive mechanism control, and three running rollers can be done freely and rotate, and two running rollers wherein can carry out two in the plane to feed motion;
(2) magnesium alloy ingot blank and the mould to extruding usefulness carries out preheating, carries out extrusion operation on extruder, adjusts the running roller position at extruder discharging opening place, makes the section bar of extruding can enter in the groove of three running rollers smoothly;
(3) carry out the plane feed motion by two running rollers away from discharging opening in three running rollers of hydraulic drive mechanism control, adjust the angle of bend and the bending radius of section bar by the mutual spacing between three people's running rollers.
3. extruding-bending integral forming method for magnesium alloy profiles according to claim 2 is characterized in that, described extrusion operation, and its temperature range is 300 ℃～400 ℃.
4. according to claim 2 or 3 described extruding-bending integral forming method for magnesium alloy profiles, it is characterized in that, described extrusion operation, its velocity interval is 10mm/s-100mm/s.
5. extruding-bending integral forming method for magnesium alloy profiles according to claim 1 is characterized in that, described section bar enters the preceding temperature of running roller more than or equal to 300 ℃.
6. extruding-bending integral forming method for magnesium alloy profiles according to claim 1 is characterized in that, the temperature after described shape bending is shaped is more than or equal to 150 ℃.
7. extruding-bending integral forming method for magnesium alloy profiles according to claim 1 and 2 is characterized in that, described shape bending radius is greater than the twice of circular section section bar diameter.
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| CNA200710171857XA CN101181771A (en) | 2007-12-06 | 2007-12-06 | Extruding-bending integral forming method for magnesium alloy profiles |
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| CNA200710171857XA CN101181771A (en) | 2007-12-06 | 2007-12-06 | Extruding-bending integral forming method for magnesium alloy profiles |
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| CN101905249A (en) * | 2010-07-30 | 2010-12-08 | 长沙仲腾金属材料科技有限公司 | Method and device for machining curved profiles in combination with online quenching temperature control in short flow |
| CN103192266A (en) * | 2013-04-03 | 2013-07-10 | 哈尔滨理工大学 | Extruding and rolling composite forming device and method of integral panel skin with ribs |
| CN103302125A (en) * | 2013-06-07 | 2013-09-18 | 湖南大学 | On-line bending and forming device of three-dimensional variable-radian extrusion profile |
| CN103515712A (en) * | 2012-06-15 | 2014-01-15 | 深圳光启创新技术有限公司 | Metamaterial and preparation method thereof |
| CN105642693A (en) * | 2014-12-02 | 2016-06-08 | 财团法人金属工业研究发展中心 | Composite pipe and manufacturing method thereof |
| JP2017060996A (en) * | 2015-09-24 | 2017-03-30 | アイシン軽金属株式会社 | Roll bending device and rolling processing method with use of same |
| CN107716664A (en) * | 2017-09-30 | 2018-02-23 | 深圳市中创镁工程技术有限公司 | A kind of bending machining equipment of magnesium alloy profiles |
| CN107717466A (en) * | 2017-09-30 | 2018-02-23 | 深圳市中创镁工程技术有限公司 | A kind of magnesium alloy profiles deep processing producing line |
| CN111283006A (en) * | 2020-02-26 | 2020-06-16 | 凯维思轻量化智能制造研究院(菏泽)有限公司 | Bidirectional extrusion forming process and equipment |
| CN111344076A (en) * | 2017-11-15 | 2020-06-26 | 爱信轻金属株式会社 | Continuous production system and continuous production method for aluminum products |
| CN111580464A (en) * | 2020-05-20 | 2020-08-25 | 南京航空航天大学 | Method for analyzing forming track of three-dimensional constant curvature member freely bent by multiple rollers |
| CN111760923A (en) * | 2019-03-30 | 2020-10-13 | 江苏大学 | Extrusion-bending integrated forming method for aluminum alloy section bar of passenger car framework |
| CN111974850A (en) * | 2020-09-11 | 2020-11-24 | 中国电建集团核电工程有限公司 | Pipeline is curved system instrument in batches |
| CN114147426A (en) * | 2021-11-30 | 2022-03-08 | 中国兵器工业第五九研究所 | Acute plastic forming method for conical thin-wall component |
| CN115069852A (en) * | 2022-07-18 | 2022-09-20 | 山东大学 | Method and system for quantitatively controlling bending profile of differential extrusion bending section |
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2007
- 2007-12-06 CN CNA200710171857XA patent/CN101181771A/en active Pending
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| CN101905249B (en) * | 2010-07-30 | 2012-01-04 | 长沙仲腾金属材料科技有限公司 | Method and device for machining curved profiles in combination with online quenching temperature control in short flow |
| CN101905249A (en) * | 2010-07-30 | 2010-12-08 | 长沙仲腾金属材料科技有限公司 | Method and device for machining curved profiles in combination with online quenching temperature control in short flow |
| CN103515712A (en) * | 2012-06-15 | 2014-01-15 | 深圳光启创新技术有限公司 | Metamaterial and preparation method thereof |
| CN103192266A (en) * | 2013-04-03 | 2013-07-10 | 哈尔滨理工大学 | Extruding and rolling composite forming device and method of integral panel skin with ribs |
| CN103192266B (en) * | 2013-04-03 | 2016-01-13 | 哈尔滨理工大学 | Band muscle integral panel squeezes compound molding device and method |
| CN103302125A (en) * | 2013-06-07 | 2013-09-18 | 湖南大学 | On-line bending and forming device of three-dimensional variable-radian extrusion profile |
| US10232422B2 (en) | 2014-12-02 | 2019-03-19 | Metal Industries Research & Development Centre | Composite tube and manufacturing method thereof |
| CN105642693A (en) * | 2014-12-02 | 2016-06-08 | 财团法人金属工业研究发展中心 | Composite pipe and manufacturing method thereof |
| JP2017060996A (en) * | 2015-09-24 | 2017-03-30 | アイシン軽金属株式会社 | Roll bending device and rolling processing method with use of same |
| CN107716664A (en) * | 2017-09-30 | 2018-02-23 | 深圳市中创镁工程技术有限公司 | A kind of bending machining equipment of magnesium alloy profiles |
| CN107717466A (en) * | 2017-09-30 | 2018-02-23 | 深圳市中创镁工程技术有限公司 | A kind of magnesium alloy profiles deep processing producing line |
| CN111344076A (en) * | 2017-11-15 | 2020-06-26 | 爱信轻金属株式会社 | Continuous production system and continuous production method for aluminum products |
| CN111760923A (en) * | 2019-03-30 | 2020-10-13 | 江苏大学 | Extrusion-bending integrated forming method for aluminum alloy section bar of passenger car framework |
| CN111283006A (en) * | 2020-02-26 | 2020-06-16 | 凯维思轻量化智能制造研究院(菏泽)有限公司 | Bidirectional extrusion forming process and equipment |
| CN111580464A (en) * | 2020-05-20 | 2020-08-25 | 南京航空航天大学 | Method for analyzing forming track of three-dimensional constant curvature member freely bent by multiple rollers |
| CN111580464B (en) * | 2020-05-20 | 2021-06-29 | 南京航空航天大学 | Method for analyzing forming track of three-dimensional constant curvature member freely bent by multiple rollers |
| CN111974850A (en) * | 2020-09-11 | 2020-11-24 | 中国电建集团核电工程有限公司 | Pipeline is curved system instrument in batches |
| CN114147426A (en) * | 2021-11-30 | 2022-03-08 | 中国兵器工业第五九研究所 | Acute plastic forming method for conical thin-wall component |
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