CN105750426B - Magnesium alloy profiles high temperature is pre-stretched automotive quick-heat system - Google Patents
Magnesium alloy profiles high temperature is pre-stretched automotive quick-heat system Download PDFInfo
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- CN105750426B CN105750426B CN201410797596.2A CN201410797596A CN105750426B CN 105750426 B CN105750426 B CN 105750426B CN 201410797596 A CN201410797596 A CN 201410797596A CN 105750426 B CN105750426 B CN 105750426B
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- alloy profiles
- shears
- stretched
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 37
- 238000003780 insertion Methods 0.000 claims abstract description 7
- 230000037431 insertion Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 208000019300 CLIPPERS Diseases 0.000 claims 1
- 208000021930 chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids Diseases 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 230000032683 aging Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- Extrusion Of Metal (AREA)
Abstract
The invention discloses a kind of magnesium alloy profiles high temperature to be pre-stretched automotive quick-heat system, including low-voltage direct high-current supply, wire, clamp, thermocouple, moist closet and shears；Wherein, the both positive and negative polarity of low-voltage direct high-current supply is connected magnesium alloy profiles both ends with clamp by wire and forms loop；It is in close contact in thermocouple insertion moist closet with magnesium alloy profiles；Moist closet is fixed on shears, and the shears is realized by hydraulic means and lifted.The present invention uses low-voltage direct high current heating technique, high current is set directly by magnesium alloy profiles, to cause joule heating effect using the resistance of magnesium alloy profiles itself, realization is rapidly heated, heating-up temperature can be controlled in 0.5 15min in 90 300 DEG C of selections, heat time.The present invention is simple in construction, easy to use, and section bar can be uniformly heated to higher temperature in a short time, magnesium alloy profiles are pre-stretched at high temperature, so as to avoid being broken and obtain larger pre-stretching amount.
Description
Technical field
The present invention relates to a kind of magnesium alloy profiles high temperature to be pre-stretched automotive quick-heat system, belongs to metal material processing technology neck
Domain.
Background technology
Pre-stretching can not only align section bar, and can effectively eliminate residual stress, be a key of shape production
Link.Pre-stretching is generally carried out at room temperature, and pretensioning device does not possess heating function generally.With aluminium alloy (fcc structure) phase
Than the temperature-room type plasticity of conventional wrought magnesium alloy (hcp structures) section bar is relatively low, and this temperature-room type plasticity for being primarily due to magnesium alloy becomes
Shape is confined to basal plane { 0001 } ＜ 11-20 ＞ slidings and the conical surface { 10-12 } ＜ 10-11 ＞ are twin, so as to cause more grained magnesium alloys to be not easy
Produce macroscopic yield and big stress concentration is easily produced in crystal boundary.When compound segregation in section bar tissue be present, its plasticity
Also can further reduce.
Inventor has found in the industrialized production of the heat resistance magnesium alloy section bar of high rare-earth content：Room temperature is pre-stretched aligning
An important factor for restricting yield rate at present, the relatively low temperature-room type plasticity of magnesium alloy easily cause fracture and thing followed resilience curved
Thus song, substantial amounts of waste product produce, human and material resources that early stage puts into the processes such as melting, heat treatment and extruding and financial resources with
Waste.Test result indicates that：The plasticity of magnesium alloy is raised and increased with temperature, because with the rise of temperature, non-basal plane is slided
The critical decomposition shearing stress rapid decrease of shifting, has more slip systems and starts.Therefore, can be at high temperature to magnesium alloy profiles
It is pre-stretched, so as to avoid being broken and obtain larger pre-stretching amount.In addition, magnesium alloy profiles generally require artificial aging,
Aging furnace can be passed directly to after high temperature pre-stretching, can be with the effectively save energy.The difficult point of the technology is：How quick liter is realized
Temperature is so as to weakening Precipitation or plasticity declines caused by crystal grain is grown up.
The content of the invention
Based on this, it is an object of the invention to provide a kind of magnesium alloy profiles high temperature to be pre-stretched automotive quick-heat system, is used for
Magnesium alloy profiles are heated rapidly to predetermined temperature, magnesium alloy profiles are pre-stretched at high temperature, so as to avoid fracture simultaneously
Obtain larger pre-stretching amount.
To achieve the above object, the present invention uses following technical scheme：
A kind of magnesium alloy profiles high temperature is pre-stretched automotive quick-heat system, including low-voltage direct high-current supply, wire, folder
Pincers, thermocouple, moist closet and shears；Wherein, the both positive and negative polarity of low-voltage direct high-current supply is connected by wire with clamp
Magnesium alloy profiles both ends form loop；It is in close contact in thermocouple insertion moist closet with magnesium alloy profiles；Moist closet is fixed on liter
Drop on bracket, the shears is realized by hydraulic means and lifted.
Preferably, the moist closet is made up of bottom plate and cover lid, and cover covers the hole provided with the insertion of heat supply galvanic couple, and bottom plate is fixed
On shears, it is connected through the hinge between bottom plate and cover lid.
Moist closet can be formed by multiple members, and section number is determined according to profile length.The insulation of each section
Room is made up of bottom plate and cover lid respectively, and bottom plate is fixed on shears, and cover lid is connected through the hinge with bottom plate, can be used certainly
The automatic open-close motion for realizing cover lid is put in dynamic makeup.The length of the single section of moist closet is preferably 0.5-1.5m, its interior chamber size
Determined according to section bar section shape and size, the spacing between adjacent sections is 5mm.In addition, the cover lid of each section opens one
Hole, for plugging in thermocouple.The moist closet is double-layer structure, and internal layer is insulating heat insulating material, and outer layer is steel plate.
In the automotive quick-heat system of the present invention, each property for forming part and effect are as follows：
1. the power and electric current of low-voltage direct high-current supply determine as follows：
Power P is determined by formula 1：
(formula 1)
Wherein：M is section quality (Kg), and C is material specific heat capacity (J/KgK), and Δ T is temperature rise (K), and t is the heating-up time
(s), η is radiating efficiency.
Electric current is calculated by formula 2：
(formula 2)
Wherein, R is the resistance of section bar, and R is calculated by formula 3：
(formula 3)
Wherein, ρ is resistivity, and L is profile length, and S accumulates for transverse section of section material.
2. wire is used to section bar both ends being connected with power positive cathode, composition loop, wire stylet stranded copper wire coiling, according to
Sectional area of wire is determined according to current value.
3. clamp is in close contact with section bar, electric current is set stably to pass through section bar.
4. thermocouple contacts with section bar, section bar temperature is gathered in real time, temperature signal is supplied to whistle control system, control
The break-make of power supply, thermocouple head end need to install insulation protective jacket additional.
5. moist closet is used to reduce the temperature rise period and the temperature of draw stage is scattered and disappeared, in heating and draw stage, section bar removes
Outside chuck, remainder is located inside moist closet.
6. shears is located between two bare terminal ends of pre-stretching machine, for lifting section bar, is realized and risen by hydraulic means
Drop motion.In the present invention, shears bottom is hydraulic lifting arm, and top is a section of moist closet.
The advantage of the invention is that：
The present invention uses low-voltage direct high current heating technique, high current directly by magnesium alloy profiles, is closed using magnesium
The metal type material resistance of itself causes joule heating effect, and realization is rapidly heated, and heating-up temperature can be in 90-300 DEG C of selection, heat time
It can be controlled in 0.5-15min.
The present invention is simple in construction, easy to use, section bar can be uniformly heated to higher temperature in a short time, in high temperature
Under magnesium alloy profiles are pre-stretched, so as to avoid being broken and obtain larger pre-stretching amount.
Brief description of the drawings
Fig. 1 is the structural representation that magnesium alloy profiles high temperature of the present invention is pre-stretched automotive quick-heat system.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples, but the implementation of the present invention is not limited to this.
As shown in figure 1, the magnesium alloy profiles high temperature pre-stretching automotive quick-heat system of the present invention is arranged on the two of pre-stretching machine
Between individual bare terminal end, two bare terminal ends one for being pre-stretched machine are fixing end 1, and one is movable end 11, fixing end 1 and movable end
11 are respectively provided with jaw 2.The automotive quick-heat system includes low-voltage direct high-current supply 3, wire 4, clamp 5, thermocouple 6, insulation
Room 7 and shears 8；Wherein, the both positive and negative polarity of low-voltage direct high-current supply 3 connects magnesium alloy profiles by wire 4 and clamp 5
Both ends form loop；Thermocouple 6 is inserted in moist closet 7 and is in close contact with magnesium alloy profiles 9；Moist closet 7 is by multiple members
Forming, the moist closet of each section is separately made up of bottom plate 10 and cover lid 12, and bottom plate 10 is fixed on shears 8,
Bottom plate is connected through the hinge with cover lid, and automation equipment can be used to realize the automatic open-close motion of cover lid.Shears 8 passes through
Hydraulic means realizes lifting.Cover lid 12 is provided with the hole of heat supply galvanic couple insertion, and bottom plate is fixed on shears, and bottom plate covers with cover
Between be connected through the hinge.The bottom plate and cover lid of each section moist closet are double-layer structure, and internal layer is insulating heat insulating material, outside
Layer is steel plate.The length of the single section of moist closet is preferably 0.5-1.5m, and the spacing of two neighboring section is 5mm.Each section
Cover cover provided with being used to insert the hole of thermocouple 5.
The application method that the automotive quick-heat system is used for the pre-stretching of magnesium alloy profiles high temperature is as follows：
1. adjusting the distance between pre-stretching two bare terminal ends of machine, the distance is more than profile length, and does not influence lifting support
The rise of frame and moist closet；2. according to the number of profile length selection moist closet section, shears does ascending motion, drives and protects
Greenhouse is risen, and the jaw of the machine of pre-stretching is opened, and makes upper surface and the pre-stretching machine bare terminal end lower jaw of moist closet lower raft
Upper surface on a horizontal line, the cover lid of moist closet is opened；3. section bar is placed on the bottom plate of moist closet, insulation is closed
The cover lid of room, section bar retaining part are exposed at outside moist closet, ensure that section bar separates with stretching-machine, by thermocouple insertion positioned at centre
Moist closet section；4. firmly being connected wire and section bar both ends by clamp, heating-up temperature is set, switches on power, makes section bar
Start to warm up, to temperature after deenergization；5. carrying out high temperature pre-stretching, two bare terminal ends one for being pre-stretched machine are fixing end, one
Individual is movable end, and the moist closet close to movable end is declined by shears, and activity space, movable end jaw are reserved to movable end
Clamping section first, then the section bar other end is sent into fixing end jaw, fixing end jaw is clamped, then stretched, essence
True restrained stretching amount；6. pre-stretching terminates, the cover lid of moist closet is opened, section bar is transferred to aging furnace.
Embodiment
EW75 (Mg-7wt.%Gd-5wt.%Y-1.5wt.%Nd-0.5wt.%Zr) is a kind of high-strength heat-resistant magnesium alloy.
During producing 300mm × 25mm EW75 section bars using extrusion, section bar, which goes out, implements rapidly online water cooling after die orifice, to retain
High density dislocation simultaneously effectively avoids alloying element precipitation, so as to carry out tissue preparation, but online water cooling band for subsequent artefacts' timeliness
Larger quenched residual stress is carried out, thus must have been eliminated by being pre-stretched.Because EW75 alloying element content reaches
It is difficult to the compound segregation for thoroughly eliminating bulk to 14wt.%, during melting, these segregants are left in extrudate, seriously
The temperature-room type plasticity of section bar is reduced, causes room temperature to be ftractureed when being pre-stretched, cracking has caused area's bullet curved, wastes lot of materials.There will be
The section bar of serious compound segregation is excluded by A level ultrasonic examinations, and remaining is using automotive quick-heat system pair of the invention
It implements high temperature prestretching stretching process, and implementation process is as follows：
1. section carries out sawing after terminating for 300mm × 25mm EW75 profile extrusions, the length for making pre-stretching section bar is
8m, wherein, section bar both ends 600mm scopes are as clamping zone.When high temperature is pre-stretched, the heating-up time is less than 5min, temperature 200
℃.If room temperature is 20 DEG C.
2. determine the power P (W) and electric current I (A) of low-voltage direct high-current supply：
Power is calculated according to formula 1, it is known that：Section quality m=114 (Kg), specific heat capacity C are about 960 (J/Kg
K), temperature rise Δ T is 180 (K), and heating-up time t is 300 (s), and radiating efficiency η is 10%, then：
Section bar resistance is sought according to formula 3, it is known that：If electricalresistivityρ during 200 DEG C of EW75 alloys is about 7 × 10-7Ω m, type
Material length L is 8m, and transverse section of section material product S is 7.5 × 10-3m2。
Electric current is calculated by formula 2：
Power parameter is determined according to above-mentioned result of calculation：Electric current 10000A；Voltage 8V.
3. adjusting the distance between pre-stretching two bare terminal ends of machine, profile length is larger than, and do not influence shears
With the rise of moist closet；
4. bit is opened；Single moist closet section length is set to 1m, and using 5 sections, shears, which is done, to be risen
Motion, drive moist closet to rise, make upper surface and the bare terminal end lower jaw upper surface of bottom plate of moist closet on a horizontal line,
The cover lid of moist closet is opened by automation equipment；
5. section bar is placed on the bottom plate of moist closet, the cover lid of moist closet, section bar clamping part are closed by automation equipment
Position is exposed at outside moist closet, ensures that section bar does not contact with pre-stretching machine, by thermocouple insertion positioned at middle moist closet section；
6. firmly being connected wire and section bar both ends by clamp, 200 DEG C of heating-up temperature is set, switches on power, makes section bar
Heating, to temperature after deenergization；
7. carrying out high temperature pre-stretching, a moist closet section close to movable end is declined by shears, to movable end
Activity space, movable end jaw clamping section first are reserved, then the section bar other end is sent into fixing end jaw, fixing end jaw enters
Row clamping, is then stretched, accurate restrained stretching amount；
8. pre-stretching terminates, the cover lid of moist closet is opened, section bar is transferred to aging furnace.
Magnesium alloy profiles quickly can be heated to by pre- temperature using the automotive quick-heat system of the present invention, height is carried out to it
Temperature pre-stretching can effectively lift section bar plasticity, reduce and ftracture and lifted pre-stretching amount.
Claims (3)
1. a kind of magnesium alloy profiles high temperature is pre-stretched automotive quick-heat system, it is characterised in that including low-voltage direct high-current supply,
Wire, clamp, thermocouple, moist closet and shears；Wherein, the both positive and negative polarity of low-voltage direct high-current supply passes through wire and folder
Clipper joint magnesium alloy profiles both ends form loop；Moist closet is fixed on shears, and the shears is real by hydraulic means
Now lift；It is in close contact in thermocouple insertion moist closet with magnesium alloy profiles；The moist closet is formed by multiple members, often
The moist closet of individual section is made up of bottom plate and cover lid respectively, and bottom plate is fixed on shears, and cover lid is connected with bottom plate by hinge
Connect；The length of the single section of moist closet is 0.5-1.5m, and the spacing of two neighboring section is 5mm.
2. magnesium alloy profiles high temperature according to claim 1 is pre-stretched automotive quick-heat system, it is characterised in that each section
Cover cover provided with being used to insert the hole of thermocouple.
3. magnesium alloy profiles high temperature according to claim 1 or 2 is pre-stretched automotive quick-heat system, it is characterised in that described
Moist closet is double-layer structure, and internal layer is insulating heat insulating material, and outer layer is steel plate.
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| CN107574393A (en) * | 2017-10-27 | 2018-01-12 | 山东省科学院新材料研究所 | A kind of magnesium alloy long and straight type material burning optimization on line straightener and method for aligning |
| CN108693046A (en) * | 2018-05-02 | 2018-10-23 | 中广核研究院有限公司 | Device for quickly elevating temperature for metal tube explosion bulge test and the method that is rapidly heated |
| CN108941306B (en) * | 2018-06-13 | 2020-06-26 | 华中科技大学 | Amorphous alloy steam explosion impact thermoforming method |
| CN111250566A (en) * | 2018-11-30 | 2020-06-09 | 宝山钢铁股份有限公司 | Stretching straightening machine |
| CN114433653B (en) * | 2020-11-02 | 2023-04-21 | 宝钢金属有限公司 | Thermal straightening and aging integrated treatment method for magnesium alloy extruded profile |
| CN114683000B (en) * | 2021-05-27 | 2023-11-17 | 江苏瑞吉达建材科技有限公司 | Preparation method of corrosion-resistant double-curvature aluminum alloy plate |
| CN113484127A (en) * | 2021-06-18 | 2021-10-08 | 合肥原位科技有限公司 | Instantaneous ultra-high temperature vacuum platform device |
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| CN103286235A (en) * | 2013-04-18 | 2013-09-11 | 重庆市科学技术研究院 | Automatic production line for hot stamping formation of magnesium alloy boards |
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| JPS6048249B2 (en) * | 1977-08-29 | 1985-10-26 | 住友重機械工業株式会社 | Mold isolation device for mold preheating |
| JP2011255413A (en) * | 2010-06-11 | 2011-12-22 | Toyoda Iron Works Co Ltd | Device for heating steel sheet, method for manufacturing press-formed article, and press-formed article |
| CN102172689B (en) * | 2011-01-26 | 2012-11-28 | 上海交通大学 | Electroplastic bending device for light metal section |
| CN102500675B (en) * | 2011-10-13 | 2013-12-04 | 北京航空航天大学 | Hot forming tool of titanium alloy thin-wall part and machining method of hot forming tool |
| CN102814368A (en) * | 2012-08-23 | 2012-12-12 | 北京航空航天大学 | Compound molding tool system for hot stretch bending and creep deformation of section bar and application method of compound molding tool system |
| CN203401212U (en) * | 2013-08-23 | 2014-01-22 | 哈尔滨工大宇航精工科技有限公司 | Pulse current auxiliary titanium alloy partial high temperature diffusion bonding device |
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Effective date of registration: 20190117 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: No. 2, Xinjie street, Xicheng District, Beijing, Beijing Patentee before: General Research Institute for Nonferrous Metals |