CN105750426A - Magnesium-alloy sectional-material high-temperature prestretching rapidly heating system - Google Patents
Magnesium-alloy sectional-material high-temperature prestretching rapidly heating system Download PDFInfo
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Abstract
The invention discloses a magnesium-alloy sectional-material high-temperature prestretching rapidly heating system.The magnesium-alloy sectional-material high-temperature prestretching rapidly heating system comprises a low-voltage direct-current large-current power source, a wire, clamps, a thermoelectric couple, heat preservation chambers and lifting brackets.A positive pole and a negative pole of the low-voltage direct-current large-current power source are connected with the two ends of a magnesium-alloy sectional material through the wire and the clamps to form a loop; the thermoelectric couple is inserted into the heat preservation chambers and in close contact with the magnesium-alloy sectional material; the heat preservation chambers are fixed on the lifting brackets, and the lifting brackets lift through a hydraulic device.According to the magnesium-alloy sectional-material high-temperature prestretching rapidly heating system, the low-voltage direct-current large-current heating technology is adopted, a large current directly passes through the magnesium-alloy sectional material, the resistance of the magnesium-alloy sectional material is used to cause the Joule heating effect, rapid temperature rising is achieved, the heating temperature can be selected at the temperature of 90 DEG C-300 DEG C, the heating time can be controlled 0.5 min-15 min.The magnesium-alloy sectional-material high-temperature prestretching rapidly heating system is simple in structure and convenient to use, the sectional material can be evenly heated to the high temperature in a short time, the magnesium-alloy sectional material is prestretched at the high temperature, and therefore fracture is avoided to obtain the large prestretching amount.
Description
Technical field
The present invention relates to a kind of magnesium alloy profiles high temperature prestretched automotive quick-heat system, belong to metal material processing technical field.
Background technology
Prestretched can not only align section bar, and can effectively eliminate residual stress, is a key link of shape production.Prestretched generally at room temperature carries out, and pretensioning device does not generally possess heating function.Compared with aluminium alloy (fcc structure), the temperature-room type plasticity of conventional wrought magnesium alloy (hcp structure) section bar is relatively low, this temperature-room type plasticity deformation being primarily due to magnesium alloy is confined to basal plane, and { { 10-12} < 10-11 > is twin, thus causing that many grained magnesium alloys are not likely to produce macroscopic yield and easily produce big stress at crystal boundary and concentrate for 0001} < 11-20 > sliding and the conical surface.When there is compound segregation in section bar tissue, its plasticity also can reduce further.
Inventor finds in the industrialized production of the heat resistance magnesium alloy section bar of high rare-earth content: room temperature prestretched aligning is the key factor restricting yield rate at present, the relatively low temperature-room type plasticity of magnesium alloy very easily causes fracture and thing followed resilience bending, substantial amounts of waste product thus produces, and human and material resources and financial resources that early stage puts in the operations such as melting, heat treatment and extruding are wasted therewith.Test result indicate that: the plasticity of magnesium alloy raises with temperature and increases, because along with the rising of temperature, the critical decomposition shearing stress rapid decrease of non-basal slip, has more slip system and starts.Therefore, it can at high temperature magnesium alloy profiles be carried out prestretched, thus avoiding fracture and obtaining bigger prestretched amount.It addition, magnesium alloy profiles generally requires artificial aging, aging furnace can be passed directly to after high temperature prestretched, it is possible to the effectively save energy.The difficult point of this technology is: how to realize being rapidly heated thus weakening Precipitation or plasticity that grain growth causes declines.
Summary of the invention
Based on this, it is an object of the invention to provide a kind of magnesium alloy profiles high temperature prestretched automotive quick-heat system, for magnesium alloy profiles is heated rapidly to predetermined temperature, at high temperature magnesium alloy profiles is carried out prestretched, thus avoiding fracture and obtaining bigger prestretched amount.
For achieving the above object, the present invention is by the following technical solutions:
A kind of magnesium alloy profiles high temperature prestretched 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 connects composition loop, magnesium alloy profiles two ends by wire and clamp；Thermocouple inserts in moist closet and is in close contact with magnesium alloy profiles；Moist closet is fixed on shears, and this shears realizes lifting by hydraulic means.
Preferably, described moist closet is made up of base plate and cover cap, and cover cap is provided with mean for the hole that thermocouple inserts, and base plate is fixed on shears, is connected through the hinge between base plate and cover cap.
Moist closet can be formed by multiple members, determines section number according to profile length.The moist closet of each section is made up of base plate and cover cap respectively, and base plate is fixed on shears, and cover cap and base plate are connected through the hinge, it is possible to adopt automation equipment to realize the automatic open-close motion of cover cap.The length of the single section of moist closet is preferably 0.5-1.5m, and its inner chamber size is determined according to section bar section shape and size, and the spacing between adjacent sections is 5mm.It addition, the cover cap of each section opens a hole, it is used for inserting thermocouple.Described 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 character constituting part and effect are as follows:
1. the power of low-voltage direct high-current supply and electric current are determined as follows:
Power P is determined by formula 1:
Wherein: m is section quality (Kg), C be material specific heat capacity (J/Kg K), Δ T be temperature rise (K), t is the heating-up time (s), and η is radiating efficiency.
Electric current is calculated by formula 2:
Wherein, R is the resistance of section bar, and R is calculated by formula 3:
Wherein, ρ is resistivity, and L is profile length, and S is that transverse section of section material amasss.
2. wire is for being connected section bar two ends with power positive cathode, constitutes loop, wire stylet stranded copper wire coiling, determines sectional area of wire according to current value.
3. clamp and section bar close contact, make current stabilization pass through section bar.
4. thermocouple contacts with section bar, Real-time Collection section bar temperature, and temperature signal is supplied to whistle control system, controls the break-make of power supply, and thermocouple head end need to install insulation protective jacket additional.
5. moist closet scatters and disappears for the temperature reducing temperature rise period and draw stage, and in heating and draw stage, section bar is except chuck, and remainder is positioned at inside moist closet.
6. shears is between two bare terminal ends of prestretched machine, is used for lifting section bar, realizes elevating movement by hydraulic means.In the present invention, shears bottom is hydraulic lifting arm, and top is a section of moist closet.
It is an advantage of the current invention that:
The present invention adopts the big electric current heating technique of low-voltage direct, make big electric current either directly through magnesium alloy profiles, utilize the resistance of magnesium alloy profiles self to cause joule heating effect, it is achieved to be rapidly heated, heating-up temperature can 90-300 DEG C of selection, and heat time heating time can be controlled in 0.5-15min.
Present configuration is simple, easy to use, section bar can be uniformly heated to higher temperature at short notice, at high temperature magnesium alloy profiles be carried out prestretched, thus avoiding fracture and obtaining bigger prestretched amount.
Accompanying drawing explanation
Fig. 1 is the structural representation of magnesium alloy profiles high temperature prestretched automotive quick-heat system of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described, but embodiments of the present invention are not limited to this.
As it is shown in figure 1, the magnesium alloy profiles high temperature prestretched automotive quick-heat system of the present invention is arranged between two bare terminal ends of prestretched machine, two bare terminal ends one of prestretched machine are fixing end 1, and one is movable end 11, and fixing end 1 and movable end 11 are respectively provided with jaw 2.This automotive quick-heat system includes low-voltage direct high-current supply 3, wire 4, clamp 5, thermocouple 6, moist closet 7 and shears 8；Wherein, the both positive and negative polarity of low-voltage direct high-current supply 3 connects composition loop, magnesium alloy profiles two ends by wire 4 and clamp 5；Thermocouple 6 inserts in moist closet 7 and is in close contact with magnesium alloy profiles 9；Moist closet 7 is formed by multiple members, the moist closet of each section is separately made up of base plate 10 and cover cap 12, base plate 10 is fixed on shears 8, and base plate and cover cap are connected through the hinge, it is possible to adopt automation equipment to realize the automatic open-close motion of cover cap.Shears 8 realizes lifting by hydraulic means.Being provided with mean for the hole that thermocouple inserts on cover cap 12, base plate is fixed on shears, is connected through the hinge between base plate and cover cap.Base plate and the cover cap of each section moist closet are double-layer structure, and internal layer is insulating heat insulating material, and outer layer is steel plate.The length of the single section of moist closet is preferably 0.5-1.5m, and the spacing of adjacent two sections is 5mm.The cover cap of each section is provided with the hole for inserting thermocouple 5.
The using method that this automotive quick-heat system is used for magnesium alloy profiles high temperature prestretched is as follows:
1. adjusting the distance between two bare terminal ends of prestretched machine, this distance is more than profile length, and does not affect the rise of shears and moist closet；2. the number of moist closet section is selected according to profile length, shears does ascending motion, drives moist closet to rise, is opened by the jaw of prestretched machine, make the upper surface of the upper surface of moist closet lower raft and prestretched machine bare terminal end lower jaw on a horizontal line, the cover cap of moist closet is opened；3. being placed on the base plate of moist closet by section bar, close the cover cap of moist closet, section bar retaining part is exposed at outside moist closet, it is ensured that section bar separates with stretching-machine, and thermocouple inserts centrally located moist closet section；4. by clamp, wire and section bar two ends are firmly connected, set heating-up temperature, switch on power, make section bar start to warm up, deenergization after temperature；5. high temperature prestretched is carried out, two bare terminal ends one of prestretched machine are fixing end, one is movable end, moist closet near movable end is declined by shears, reserves activity space, movable end jaw first clamping section to movable end, the section bar other end is sent into fixing end jaw again, fixing end jaw clamps, and stretches subsequently, accurate restrained stretching amount；6. prestretched terminates, and opens the cover cap of moist closet, 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.Squeezing and pressing method is adopted to produce in 300mm × 25mmEW75 section bar process, online water-cooled implemented rapidly by section bar after going out die orifice, to retain high density dislocation and to be prevented effectively from alloying element precipitation, prepare thus carrying out tissue for subsequent artefacts's timeliness, but online water-cooled brings bigger quenched residual stress, thus must flow through prestretched and eliminated.Owing to the alloying element content of EW75 reaches 14wt.%, being difficult to thoroughly eliminate the compound segregation of bulk during melting, these segregant are left in extrudate, the serious temperature-room type plasticity reducing section bar, causing and ftracture during room temperature prestretched, cracking has caused that district's bullet is curved, wastes lot of materials.Being excluded by A level ultrasonic examination by the section bar that there is intensification compound segregation, remaining adopts the automotive quick-heat system of the present invention that it is implemented high temperature prestretched technique, and implementation process is as follows:
1. cross section is carry out sawing after the EW75 profile extrusion of 300mm × 25mm terminates, and the length making prestretched section bar is 8m, and wherein, section bar two ends 600mm scope is as clamping zone.During high temperature prestretched, the heating-up time, temperature was 200 DEG C less than 5min.If room temperature is 20 DEG C.
2. power P (W) and the electric current I (A) of low-voltage direct high-current supply are determined:
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), 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: electricalresistivityρ when setting EW75 alloy 200 DEG C is about 7 × 10-7Ω m, profile length L are 8m, and the long-pending S of transverse section of section material is 7.5 × 10-3m2。
Electric current is calculated by formula 2:
Power parameter is determined: electric current 10000A according to above-mentioned result of calculation；Voltage 8V.
3. the distance between two bare terminal ends of prestretched machine is adjusted so that it is more than profile length, and do not affect the rise of shears and moist closet；
4. bit is opened；Single moist closet section length is decided to be 1m, using 5 sections, shears does ascending motion, drives moist closet to rise, make upper surface and the bare terminal end lower jaw upper surface of base plate of moist closet on a horizontal line, by automation equipment, the cover cap of moist closet is opened；
5. being placed on the base plate of moist closet by section bar, closed the cover cap of moist closet by automation equipment, section bar retaining part is exposed at outside moist closet, it is ensured that section bar does not contact with prestretched machine, and thermocouple inserts centrally located moist closet section；
6. by clamp, wire and section bar two ends are firmly connected, set heating-up temperature 200 DEG C, switch on power, make section bar heat up, deenergization after temperature；
7. carrying out high temperature prestretched, a moist closet section near movable end is declined by shears, reserves activity space to movable end, movable end jaw first clamping section, then the section bar other end is sent into fixing end jaw, fixing end jaw clamps, stretch subsequently, accurate restrained stretching amount；
8. prestretched terminates, and opens the cover cap of moist closet, section bar is transferred to aging furnace.
It quickly by magnesium alloy profiles heating extremely pre-temperature, can be carried out high temperature prestretched and can effectively promote section bar plasticity, reduce cracking and also promote prestretched amount by the automotive quick-heat system adopting the present invention.
Claims (6)
1. a magnesium alloy profiles high temperature prestretched automotive quick-heat system, it is characterised in that include 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 connects composition loop, magnesium alloy profiles two ends by wire and clamp；Moist closet is fixed on shears, and this shears realizes lifting by hydraulic means；Thermocouple inserts in moist closet and is in close contact with magnesium alloy profiles.
2. magnesium alloy profiles high temperature prestretched automotive quick-heat system according to claim 1, it is characterized in that, described moist closet is made up of base plate and cover cap, and cover cap is provided with mean for the hole that thermocouple inserts, base plate is fixed on shears, is connected through the hinge between base plate and cover cap.
3. magnesium alloy profiles high temperature prestretched automotive quick-heat system according to claim 1, it is characterized in that, described moist closet is formed by multiple members, and the moist closet of each section is made up of base plate and cover cap respectively, base plate is fixed on shears, and cover cap and base plate are connected through the hinge.
4. magnesium alloy profiles high temperature prestretched automotive quick-heat system according to claim 3, it is characterised in that the length of the single section of described moist closet is 0.5-1.5m, and the spacing of adjacent two sections is 5mm.
5. magnesium alloy profiles high temperature prestretched automotive quick-heat system according to claim 3, it is characterised in that the cover cap of each section is provided with the hole for inserting thermocouple.
6. the magnesium alloy profiles high temperature prestretched automotive quick-heat system according to any one of claim 1-5, 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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Cited By (7)
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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 |
| CN108941306A (en) * | 2018-06-13 | 2018-12-07 | 华中科技大学 | A kind of amorphous alloy steam explosion impact thermo shaping method |
| CN111250566A (en) * | 2018-11-30 | 2020-06-09 | 宝山钢铁股份有限公司 | Stretching straightening machine |
| 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 |
| CN114433653A (en) * | 2020-11-02 | 2022-05-06 | 宝钢金属有限公司 | Magnesium alloy extruded section bar thermal straightening-aging integrated treatment method and device thereof |
| CN114683000A (en) * | 2021-05-27 | 2022-07-01 | 江苏瑞吉达建材科技有限公司 | Preparation method of corrosion-resistant double-curvature aluminum alloy plate |
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| CN114683000A (en) * | 2021-05-27 | 2022-07-01 | 江苏瑞吉达建材科技有限公司 | Preparation method of corrosion-resistant double-curvature aluminum alloy plate |
| 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 |
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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 |