CN101580921B - Method for producing magnesium alloy sheet - Google Patents
Method for producing magnesium alloy sheet Download PDFInfo
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- CN101580921B CN101580921B CN2009100873191A CN200910087319A CN101580921B CN 101580921 B CN101580921 B CN 101580921B CN 2009100873191 A CN2009100873191 A CN 2009100873191A CN 200910087319 A CN200910087319 A CN 200910087319A CN 101580921 B CN101580921 B CN 101580921B
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Abstract
The invention relates to a method for producing a magnesium alloy sheet, comprising the following steps: fused magnesium alloy is poured into a molten metal pond of a double-drum type continuous casting device; the fused magnesium is cooled and solidified on the circumferential surfaces of double drums of the double-drum type continuous casting device, so as to be continuously cast into the magnesium alloy sheet with the thickness of 3-4mm; homogenizing heat treatment is carried out on the magnesium alloy sheet; after that, the magnesium alloy sheet is heated up to 430-450 DEG C again, processed by primary heat rolling at the speed of 15m/min, and then processed by secondary heat rolling at the speed of 18-19m/min when the magnesium alloy sheet is cooled to 360-380 DEG C to be further madeinto the magnesium alloy sheet with thickness of 0.5-1.5mm; finally, annealing treatment is carried out on the magnesium alloy sheet with thickness of 0.5-1.0mm. The magnesium alloy sheet produced bythe method has simple production technique, low cost and uniform grain refining, therefore, the defects of the magnesium alloy sheet is reduced to the utmost extent.
Description
Technical field
The present invention relates to a kind of production method of magnesium alloy plate, especially relate to a kind of can producing and have high-mechanical property, lack defective extremely, can be used as the method for the magnesium alloy sheet of 3C Product shell.
Background technology
The electronics technology development is maked rapid progress, sci-tech product is constantly weeded out the old and bring forth the new, as mobile computer, mobile phone, PDA, digital camera and language translation machine etc., indispensable now especially electronics technology product, also because the lifting of science and technology, product category is a feast for the eyes especially, and gradually based on light-weighted information products, and under the demand along with the continuous lightweight of product, except the internals of product own needs towards light and handy precision, the decrement of product casing is one of essential emphasis of breaking through of lightweight product especially.
The defective that the information products enclosure volume is big in order to improve, quality is heavy, developed magnesium alloy at present as the main material of product casing, main system is good because of light weight, structural strength height, good rigidly, thermal conductivity height, the damping ability of magnesium alloy itself, thickness after its processing is thinner than the common metal material, and therefore utilizing magnesium alloy is the main flow that main material has just like become the high-tech product shell.
General using die casting or semi-solid state are penetrated the magnesium alloy that uses mostly adopt the physical properties and the mechanical properties of AA5052, pure titanium and stainless steel etc. that rolled stock AZ31B alloy, aluminium alloy stamping parts use to do a comparative analysis, can know and learn following result as processing modes such as AZ91D, impact forging, punching press and superplasticity:
1. the magnesium alloy light weight is a principal character, and proportion is 2/3rds of aluminium, and 2/5ths of titanium then has only 1/4th as if comparing with stainless steel.
2. though thermal conductivity has only about half of aluminium alloy, but than 5～7 times of stainless steel or pure titanium excellences.
3. the intensity of magnesium alloy is better than pure titanium as can be known, aluminium alloy reaches and do not lock steel by specific tenacity (tensile strength/proportion).
By proving very clearly in the comparative descriptions of above table that magnesium alloy is best suited for being applied to the outer casing member of thin-walled information portable instrument tool, but be subjected in the restriction of existing magnesium alloy technology and attenuate again, be not the structural strength deficiency, meaning is that product all has the Over-design phenomenon of (surmounting design).
The manufacturing of magnesium alloy is mainly based on die casting and semi-solid state method of radiation at present, and the magnesium alloy structure that utilizes die casting and semi-solid state method of radiation to manufacture, its maximum width is 250mm only, thickness more belong to difficult and will reach 0.8mm, and be prone to many defectives, as pin hole, pore, shrinkage cavity, cold joint line and phenomenon such as mold filling fully not, therefore must be manually to repair the operation (being similar to the benefit cubic metre of earth formula of automobile sheet metal baking vanish) of mending soil, this back segment processing costs time-consuming and labor intensive is quite high, to such an extent as to cause holding at high price of magnesium alloy; The magnesium that is all fusion (or semi-melting) owing to the technology of above-mentioned die casting and semi-solid state method of radiation injects the method for making finished product in the die cavity, therefore when the information of making portable instrument thin-wall shell spare, often too many because of time material such as running channel, runner, rising head, cause problems such as yield rate is too low.
The manufacture of common metal plate is to utilize the roomy slab of continuous casting or D.C.casting, continuous rolling through multi-pass becomes fine sheet, belong to mass production and highly business-like manufacture, many rolling equipments of this arts demand, e Foerderanlage, roomy factory building etc., whole investment is quite huge.The example that is fabricated to aluminium sheet, slab weigh 30 centimeters of 5～6 tons, high 5 meters, thickness, through becoming sheet product after the steps such as the hot rolling of multistation multi-pass, cold rolling, leveling, these manufactures not only expend quite huge expense, reality consuming time does not again meet economic benefits, therefore if can use the plastic working of magnesium plate, can make outer casing member in the product that satisfies the minimal thickness of output under the requirement of strength, can make more lightweight of product, material-saving and increase space between mechanism design.
The magnesium alloy ingot of making the method in common of magnesium alloy sheet and being casting in mould carries out hot rolling.Yet the magnesium alloy sheet yield rate that simple hot rolling is made is not high, and defective is more.
Summary of the invention
For this reason, the invention provides a kind of magnesium alloy thin board production technology, it mainly is that continuous casting and hot rolling are combined, under the parameter condition of setting, obtain the magnesium alloy sheet of satisfactory mechanical property, again the magnesium plate after rolling is carried out surface treatment and material behavior analysis, the last thin plate that will be shaped is again transferred to 3C shell source mill, utilize punching press or impact forging molding mode, develop the shell of information products, to reach light-weighted requirement.
Particularly, the invention provides a kind of production method of magnesium alloy sheet, may further comprise the steps:
Step 1: molten magnesium alloy is poured in the pool of molten metal of double-cylinder continuously casting equipment;
Step 2: make described molten magnesium alloy on the peripheral surface of the twin-roll of described double-cylinder continuously casting equipment, cool off and solidify, molten magnesium alloy is continuously cast into the magnesium alloy sheet that thickness is 3～4mm;
Step 3: to the thermal treatment that homogenizes of described magnesium alloy sheet, at first the magnesium alloy sheet that casts continuously is heated to 370～380 degrees centigrade during thermal treatment, kept 4～5 hours, further be heated to 450～460 degrees centigrade again, kept 15～16 hours, carry out anneal subsequently, in 2～3 hours, be annealed to 100～150 degrees centigrade;
Step 4: will be heated to 430～450 degrees centigrade once more through the heat treated magnesium alloy sheet that homogenizes, carry out the hot rolling first time with 15 meters/minute speed, when treating that subsequently magnesium alloy sheet is cooled to 360～380 degrees centigrade, carry out the hot rolling second time with 18～19 meters/minute speed, further to make the magnesium alloy sheet that thickness is 0.5～1.5mm;
Step 5: last, be that the magnesium alloy sheet of 0.5～1.5mm carries out anneal to described thickness.
In the production method of described magnesium alloy sheet, in step 1, the shared part by weight of the solid phase of described molten magnesium alloy is lower than below 10%.
In the production method of described magnesium alloy sheet, in step 1, the component of described magnesium alloy comprises: the zinc of 4～5 weight %; The silver of 3～4.5 weight %; The zirconium of 1～1.5 weight %; 0.8 the manganese of～1.0 weight %; 4.5 the yttrium of～5.0 weight %; All the other components are magnesium.
In the production method of described magnesium alloy sheet, in described step 3: at first the magnesium alloy sheet with continuous casting is heated to 380 degrees centigrade, kept 4.5 hours, further be heated to 460 degrees centigrade again, kept 15 hours, carry out anneal subsequently, in 3 hours, be annealed to 100 degrees centigrade.
In the production method of described magnesium alloy sheet, in described step 4: will be heated to 450 degrees centigrade once more through the heat treated magnesium alloy sheet that homogenizes, carry out the hot rolling first time with 15 meters/minute speed, when treating that subsequently magnesium alloy sheet is cooled to 380 degrees centigrade, carry out the hot rolling second time with 18 meters/minute speed.
In the production method of described magnesium alloy sheet, in described step 2: the thickness demand of the magnesium alloy sheet that the distance between the described twin-roll can go out according to continuous casting is adjusted.
In the production method of described magnesium alloy sheet, in described step 3, after the thermal treatment that homogenizes, crystal grain is of a size of 20～30 μ m in the described magnesium alloy sheet.
Main beneficial effect of the present invention is: utilize continuous casting process, the thermal treatment process that homogenizes, hot rolling, annealing process etc., produce the magnesium alloy sheet that meets the lightweight demand, to reduce cost, to improve the market competitiveness.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for production magnesium alloy sheet of the present invention.
Embodiment
Be described further below in conjunction with the method for accompanying drawing, can implement according to this so that those skilled in the art consult this specification sheets to production magnesium alloy sheet of the present invention.
See also shown in first figure, method of the present invention comprises the following step: step 1: molten magnesium alloy is poured in the pool of molten metal of double-cylinder continuously casting equipment; Step 2: make described molten magnesium alloy on the peripheral surface of the twin-roll of described double-cylinder continuously casting equipment, cool off and solidify, molten magnesium alloy is continuously cast into the magnesium alloy sheet that thickness is 3～4mm; Step 3: to the thermal treatment that homogenizes of described magnesium alloy sheet, at first the magnesium alloy sheet that casts continuously is heated to 370～380 degrees centigrade during thermal treatment, kept 4～5 hours, further be heated to 450～460 degrees centigrade again, kept 15～16 hours, carry out anneal subsequently, in 2～3 hours, be annealed to 100～150 degrees centigrade; Step 4: will be heated to 430～450 degrees centigrade once more through the heat treated magnesium alloy sheet that homogenizes, carry out the hot rolling first time with 15 meters/minute speed, when treating that subsequently magnesium alloy sheet is cooled to 360～380 degrees centigrade, carry out the hot rolling second time with 18～19 meters/minute speed, further to make the magnesium alloy sheet that thickness is 0.5～1.5mm; Step 5: last, be that the magnesium alloy sheet of 0.5～1.5mm carries out anneal to described thickness.
Method of the present invention at first is to utilize twin-roll that the magnesium alloy liquation is cast continuously, and the magnesium alloy liquation is made magnesium alloy sheet.Testing surface is lower than 10% when following at the shared part by weight of the solid phase of described molten magnesium alloy, and this continuous casting can obtain good casting effect.If the shared part by weight of the solid phase of molten magnesium alloy surpasses 10%, then uneven situation appears in the continuous casting magnesium alloy sheet that goes out easily, causes local defect.
The fused magnesium alloy is the cooled and solidified moulding on the surface of twin-roll, constantly is released along with the rotation of twin-roll.The thickness of the magnesium alloy sheet of being cast changes along with the adjustment in gap between the twin-roll, in principle, spacing between the twin-roll can be adjusted between 1～10mm, yet to be fit to the magnesium alloy sheet that the 3C Product shell uses in order producing, to think that it is good that the spacing between the twin-roll is adjusted between 3～4mm.
The heat treated main purpose that homogenizes is further crystal grain thinning, makes that the magnesium alloy sheet material is more even, overcomes physical imperfection.The contriver finds that when heat-treating, at first the magnesium alloy sheet with continuous casting is heated to 370～380 degrees centigrade, keeps 4～5 hours, helps reducing the segregation of magnesium alloy materials like this.Further be heated to 450～460 degrees centigrade again, kept 15～16 hours, carry out anneal subsequently, during annealing, need slowly annealing, preferably in 2～3 hours, be annealed to 100～150 degrees centigrade.Thermal treatment that homogenizes through such can be refined into the magnesium alloy sheet of crystal particles size between 20～30 μ m at the magnesium alloy sheet more than the 100 μ m with the crystal particles size.
To make thinner magnesium alloy plate by the hot rolling of twice friction-motion speed, differing temps through the magnesium alloy sheet of grain refining.Final thickness can reach between 0.5～1.5mm.At last magnesium alloy sheet is carried out anneal.
The contriver also finds, when the component of described magnesium alloy comprises: the zinc of 4～5 weight %; The silver of 3～4.5 weight %; The zirconium of 1～1.5 weight %; 0.8 the manganese of～1.0 weight %; 4.5 the yttrium of～5.0 weight %; When all the other components are magnesium, can obtain good continuous casting effect.
When adopting following parameters, promptly at first the magnesium alloy sheet that casts continuously is heated to 380 degrees centigrade, kept 4.5 hours, further be heated to 460 degrees centigrade again, kept 15 hours, carry out anneal subsequently, in 3 hours, be annealed to 100 degrees centigrade, can obtain the good thermal effectiveness that homogenizes.
When adopting following parameters, be about to be heated to 450 degrees centigrade once more through the heat treated magnesium alloy sheet that homogenizes, carry out the hot rolling first time with 15 meters/minute speed, when treating that subsequently magnesium alloy sheet is cooled to 380 degrees centigrade, carry out the hot rolling second time with 18 meters/minute speed, can obtain good hot rolling effect.
As mentioned above, the thickness demand of the magnesium alloy sheet that can go out according to continuous casting of the distance between the described twin-roll is adjusted.
As mentioned above, after the thermal treatment that homogenizes, crystal grain is of a size of 20～30 μ m in the described magnesium alloy sheet.
Magnesium alloy is by casting, homogenize thermal treatment and the hot rolling grain refining with the magnesium intralamellar part continuously, and the thin plate sheet of formation thinner thickness, its this magnesium alloy thin plate not only can make the high-tech information products, reach lightweight as mobile computer, communication product, digital product etc., the die casting that also can replace aluminium alloy car, in addition magnesium alloy has characteristics such as metal-like, hardness height, intensity are big, so not only can use by effectively wide model, use the raising industrial competitiveness, but and the mass production manufacturing, significantly reduce manufacturing cost.
In sum, the method of production magnesium alloy sheet of the present invention not only can make the thickness of magnesium alloy effectively reduce, and making information products reach light-weighted must ask, but and mass production make the more wide model of Application of Magnesium, and significantly reduce the manufacturing cost of magnesium alloy, improve the competitive power of industry.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification sheets and the embodiment, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, therefore under the universal that does not deviate from claim and equivalency range and limited, the legend that the present invention is not limited to specific details and illustrates here and describe.
Claims (7)
1. the production method of a magnesium alloy sheet may further comprise the steps:
Step 1: molten magnesium alloy is poured in the pool of molten metal of double-cylinder continuously casting equipment;
Step 2: make described molten magnesium alloy on the peripheral surface of the twin-roll of described double-cylinder continuously casting equipment, cool off and solidify, molten magnesium alloy is continuously cast into the magnesium alloy sheet that thickness is 3～4mm;
Step 3: to the thermal treatment that homogenizes of described magnesium alloy sheet, at first the magnesium alloy sheet that casts continuously is heated to 370～380 degrees centigrade during thermal treatment, kept 4～5 hours, further be heated to 450～460 degrees centigrade again, kept 15～16 hours, carry out anneal subsequently, in 2～3 hours, be annealed to 100～150 degrees centigrade;
Step 4: will be heated to 430～450 degrees centigrade once more through the heat treated magnesium alloy sheet that homogenizes, carry out the hot rolling first time with 15 meters/minute speed, when treating that subsequently magnesium alloy sheet is cooled to 360～380 degrees centigrade, carry out the hot rolling second time with 18～19 meters/minute speed, further to make the magnesium alloy sheet that thickness is 0.5～1.5mm;
Step 5: last, be that the magnesium alloy sheet of 0.5～1.5mm carries out anneal to described thickness.
2. the production method of magnesium alloy sheet as claimed in claim 1, wherein, in step 1, the shared part by weight of the solid phase of described molten magnesium alloy is lower than below 10%.
3. the production method of magnesium alloy sheet as claimed in claim 1, wherein, in step 1, the component of described magnesium alloy comprises: the zinc of 4～5 weight %; The silver of 3～4.5 weight %; The zirconium of 1～1.5 weight %; 0.8 the manganese of～1.0 weight %; 4.5 the yttrium of～5.0 weight %; All the other components are magnesium.
4. the production method of magnesium alloy sheet as claimed in claim 3, wherein, in described step 3: at first the magnesium alloy sheet with continuous casting is heated to 380 degrees centigrade, kept 4.5 hours, further be heated to 460 degrees centigrade again, kept 15 hours, and carried out anneal subsequently, in 3 hours, be annealed to 100 degrees centigrade.
5. the production method of magnesium alloy sheet as claimed in claim 3, wherein, in described step 4: will be heated to 450 degrees centigrade once more through the heat treated magnesium alloy sheet that homogenizes, carry out the hot rolling first time with 15 meters/minute speed, when treating that subsequently magnesium alloy sheet is cooled to 380 degrees centigrade, carry out the hot rolling second time with 18 meters/minute speed.
6. the production method of magnesium alloy sheet as claimed in claim 3, wherein, in described step 2: the thickness demand of the magnesium alloy sheet that the distance between the described twin-roll can go out according to continuous casting is adjusted.
7. the production method of magnesium alloy sheet as claimed in claim 3, wherein, in described step 3, after the thermal treatment that homogenizes, crystal grain is of a size of 20～30 μ m in the described magnesium alloy sheet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100873191A CN101580921B (en) | 2009-06-23 | 2009-06-23 | Method for producing magnesium alloy sheet |
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| CN2009100873191A CN101580921B (en) | 2009-06-23 | 2009-06-23 | Method for producing magnesium alloy sheet |
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| CN101580921A CN101580921A (en) | 2009-11-18 |
| CN101580921B true CN101580921B (en) | 2010-12-01 |
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| CN105458007A (en) * | 2015-11-24 | 2016-04-06 | 天津东义镁制品股份有限公司 | Production method for magnesium alloy sheet with thickness of 1 mm |
| CN106637011B (en) * | 2017-02-08 | 2018-05-08 | 吉林大学 | A kind of preparation method for making superplasticity magnesium alloy that there is subsphaeroidal precipitated phase |
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Owner name: BEIJING NORTH CHINA LIGHT ALLOY CO., LTD. Free format text: FORMER OWNER: BEIJING GONLEER JINGHUA TECHNOLOGY CO., LTD. Effective date: 20120305 |
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Effective date of registration: 20120305 Address after: 102211 Beijing city of Changping District Bai Shan Zhen Meng Lizu Village No. 594 Patentee after: BEIJING NORTH LIGHT ALLOY CO., LTD. Address before: 102211 518A room, 18 Fukang Road, Beijing, Changping District Patentee before: Beijing Gonleer Technology Co., Ltd. |
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Effective date of registration: 20190507 Address after: 037300 No. 2121 Fengjie, Equipment Manufacturing Industrial Park, Datong Development Zone, Shanxi Province Patentee after: Datong High Magnesium Technology Co., Ltd. Address before: No. 594, Menciu village, Baishan Town, Beijing, Beijing Patentee before: BEIJING NORTH LIGHT ALLOY CO., LTD. |
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