CN1207422C - Manufacturing method of high-plasticity magnesium alloy band - Google Patents
Manufacturing method of high-plasticity magnesium alloy band Download PDFInfo
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- CN1207422C CN1207422C CN 03134045 CN03134045A CN1207422C CN 1207422 C CN1207422 C CN 1207422C CN 03134045 CN03134045 CN 03134045 CN 03134045 A CN03134045 A CN 03134045A CN 1207422 C CN1207422 C CN 1207422C
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Abstract
The present invention relates to a method for manufacturing high-plasticity magnesium alloy strips. The method comprises: a magnesium alloy cast ingot is adopted as the raw material, the surface oxide of the magnesium alloy cast ingot is treated, the magnesium alloy cast ingot is preheated so that water is removed, and the magnesium alloy cast ingot is smelted at the temperature of 680 to 760 DEG C under the existence of argon protective gas; the liquid magnesium alloy after smelting passes through a horizontal isometric double-roll casting and rolling machine, a casting roll is preheated to 150 to 300 DEG C before casting and rolling, a magnesium alloy strip plate with the thickness of 1.5 to 3.0mm is manufactured under the conditions that the casting and rolling temperature is controlled at 680 to 760 DEG C under the existence of argon protective gas, the casting and rolling rate is controlled at 30 to 90 m/min, the casting liquid level is controlled by the contact angle between the liquid magnesium alloy and the casting roll, the roll gap of the casting roll is less than 3mm; the magnesium alloy strip plate is directly treated by cold rolling after edge cutting and acid washing, and eventually, a magnesium alloy strip with the thickness of less than 1mm is manufactured. The present invention solves the problem on blooming the magnesium alloy cast ingot, realizes short-stage continuous direct forming, reduces the cost, increases the utilization rate of the magnesium alloy, and improves the solidification structure of the magnesium alloy.
Description
Technical field
The present invention relates to a kind of manufacture method of high plastic magnesium alloy band, particularly relate to a kind of nearly end form of quick cooling and cold rolling at room temperature method of magnesium alloy strip.
Background technology
In recent years, universal day by day along with electronic products such as notebook computer, mobile phone, Kamera, ultra-thin televisions all develops towards light-weighted direction, and the casing of these products is thin-walled property day by day, and the selection of material is also towards light material simultaneously.Since magnesium alloy have light weight, specific tenacity height, than stiffness height, corrosion-resistant, damping property good, thermal conductivity good, thermostability is high, good, the recyclable utilization of electromagnetic shielding characteristic and have good advantages such as processing characteristics, therefore, become the optimal selection of electronic product enclosure aspect material.Along with the continuous increase of magnesium alloy materials, more and more stronger to the demand of magnesium alloy thin strip in the 3C sector application.Traditional magnesium alloy sheet is to adopt forged method production, employed raw material is the magnesium alloy plate goods, the size of its product is subjected to the restriction of forging mold, can only produce the product of monolithic, simultaneously must be to forge being heated under 250～400 ℃ the condition, need heat simultaneously magnesium alloy and mould, processing condition are strict, complex procedures.German Patent, patent No. DE10052423, October 23 2000 applying date.Disclosed method is that to select the AZ30 magnesium alloy ingot for use be raw material in the invention, and carrying out continuous casting in the presence of shielding gas is 50mm, is sent to hot rolling then, and hot-rolled temperature is 250～500 ℃, and product thickness is less than 4mm.This processing method is not nearly end form, needs hot rolling.From the above mentioned, at present, existing production method can not be produced the superior in quality magnesium-alloy material in thin specification surface of large format, high-ductility.
Summary of the invention
The object of the present invention is to provide a kind of nearly end form new process of production with liquid magnesium alloy direct production magnesium alloy thin strip, the magnesium alloy thin strip blank of direct production 1.5～3.0mm, and directly carry out the cold rolling of 40% draught with this strip base, produce cold rolling magnesium alloy thin strip, reach the solidified structure that improves magnesium alloy, improve the workability of magnesium alloy.Reach significantly simultaneously and reduce production costs the utilization ratio of raising magnesium alloy.
The objective of the invention is to be achieved through the following technical solutions: adopt isometrical double-roller rolling technology direct forming, at first casting of magnesium alloy is handled, remove oxide on surface, preheating temperature is 150～350 ℃ and removes moisture then, again with behind furnace heats to 200～250 ℃, add pretreated magnesium alloy ingot, in the presence of shielding gas, controlled temperature is to carry out melting between 680～760 ℃; Liquid magnesium alloy after the fusing is by the isometrical twin-roll cast-rolling mill of level; to cast roller before the casting and be preheating to 150～300 ℃; control casting temperature is 680～760 ℃ in the presence of shielding gas; roll casting speed is 30～90m/min; the liquid level of cast is to control with the liquid magnesium alloy and the contact angle of casting roller; be cast to produce the magnesium alloy thin strip blank that thickness is 1.5～3.0mm under casting roller gap＜3mm condition; again through cutting edge; after the pickling; directly carry out cold rollingly, final production thickness is less than the strip product of 1mm.
An above-mentioned isometrical twin-roll cast-rolling mill of horizontal, its casting roller diameter is 300～1500mm, roll surface width is 100～1500mm, is made by the alloy forged steel, adopts digital controllable silicon DC Transmission.The liquid level of cast is controlled with the liquid magnesium alloy and the contact angle of casting roller, and contact angle is controlled in 40 °, and the roll gap preset value is to decide according to the preproduction product thickness, is generally less than 3mm.Magnesium alloy ingot fusion process and liquid magnesium alloy strip casting process all carry out under argon shield.
The present invention compared with the prior art, significantly advantage and effect are:
1) nearly end form is made direct forming
The present invention utilizes two rolling technology, directly makes magnesium alloy strip with liquid magnesium alloy, realizes short flow process, direct forming.
2) improve the weave construction of goods
Maximum characteristics of the present invention are to utilize cooling dynamic solidification shaping new technology fast, crystal grain thinning greatly, and dendrite is broken in forming process, owing to be rapid solidification, has eliminated segregation, improves the plastic making performance of magnesium alloy strip.
3) manufacturing process is changed rapidly, continuously
The present invention is owing to adopt two roller continuous casting rolling technologies, forming process from the liquid magnesium alloy to the magnesium alloy strip only need be less than the time in 1 second, solved fundamentally that ingot casting forges and the hot rolling cogging difficulty, can't carry out problem such as cold working, directly made the magnesium alloy thin strip blank of thickness less than 3.0mm.
4) high-ductility can cold rollingly be processed
But the magnesium alloy strip that manufacture method of the present invention is produced has good toughness and cold-forming property, therefore, can directly carry out cold rolling, cold rolling draft reaches 40%, can direct production thickness less than the thin strip of 1.0mm, greatly simplified the production technique of magnesium alloy strip, and product surface quality is good, the drawing performance is good.
5) cost is simplified, saved in manufacturing process
The present invention adopts short flow process novel process, does not need conventional forging and rolling-cogging equipment, so production process is simplified, saved production cost.
Description of drawings
Fig. 1 is a technological process block-diagram of the present invention.
Embodiment
Embodiment 1
The raw material of making the high plastic magnesium alloy band is the AZ31B magnesium alloy, and its chemical ingredients is as shown in table 1.Remove the oxide compound on surface before the melting earlier; the stove of putting into temperature then and be 150～350 ℃ carried out preheating 10 minutes; remove moisture; magnesium ingot after preheating is put into smelting furnace and is carried out melting; when treating that temperature rises to 500 ℃; beginning feeds shielding gas in stove, feed in the smelting furnace with argon gas and can prevent effectively that the magnesium alloy liquation is because of the oxygen in the ingress of air burns, deterioration by oxidation.The pressure of ventilation makes to form malleation in the stove greater than 1 normal atmosphere, prevents that the stove outer air from entering.Smelting temperature when being 680 ℃ static 10 minutes begins casting then.The diameter that adopts isometrical twin-roll cast-rolling mill is 500mm; roll surface width is 254mm; casting roller preheating temperature is 300 ℃; teeming temperature is 675 ℃; roll casting speed is 90m/min, and fixed value of roller slit is 2.0mm, and liquid magnesium alloy is controlled to be 25 ° with the contact angle of casting roller; protect with argon gas in the strip casting process, contact with air and burn preventing.The cast-rolling thin strip base carries out pickling with sulfuric acid after cutting edge, carry out the cold rolling processing of 40% draught then, can get the high-quality magnesium alloy strip of any surface finish.
Table 1
| The trade mark | Al | Zn | Mn | Te | Si | Mg |
| AZ31B | 2.89 | 0.988 | 0.014 | 0.001 | 0.05 | 96.037 |
Embodiment 2
Raw material magnesium alloy and melting method and roller mill size such as embodiment 1.Smelting temperature is 720 ℃, after temperature reaches design temperature static 20 minutes, begins casting then.Casting roller preheating temperature is 300 ℃, and teeming temperature is 715 ℃, and roll casting speed is 60m/min, and fixed value of roller slit is 1.8mm, and liquid magnesium alloy is controlled to be 30 ° with the contact angle of casting roller, protects with argon gas in the strip casting process, contacts with air and burns preventing.The cast-rolling thin strip base carries out pickling with hydrochloric acid after cutting edge, carry out the cold rolling processing of 40% draught then, can get the high-quality magnesium alloy strip of any surface finish.
Embodiment 3
Raw material magnesium alloy and melting method and roller mill size such as embodiment 1.Smelting temperature is 760 ℃, after temperature reaches design temperature static 30 minutes, begins casting then.Casting roller preheating temperature is 300 ℃, and teeming temperature is 755 ℃, and roll casting speed is 30m/min, and fixed value of roller slit is 1.6mm, and liquid magnesium alloy is controlled to be 38 ° with the contact angle of casting roller, protects with argon gas in the strip casting process, contacts with air and burns preventing.The cast-rolling thin strip base carries out pickling with sulfuric acid after cutting edge, carry out the cold rolling processing of 40% draught then, can get the high-quality magnesium alloy strip of any surface finish.
Embodiment 4
Raw material magnesium alloy and melting method and roller mill size such as embodiment 1.Smelting temperature is 720 ℃, after temperature reaches design temperature static 10 minutes, begins casting then.Casting roller preheating temperature is 150 ℃, and teeming temperature is 715 ℃, and roll casting speed is 60m/min, and fixed value of roller slit is 1.8mm, and liquid magnesium alloy is controlled to be 30 ° with the contact angle of casting roller, protects with argon gas in the strip casting process, contacts with air and burns preventing.The cast-rolling thin strip base carries out pickling with sulfuric acid after cutting edge, carry out the cold rolling processing of 40% draught then, can get the high-quality magnesium alloy strip of any surface finish.
Claims (7)
1. the manufacture method of a high plastic magnesium alloy band; with the magnesium alloy ingot is raw material; earlier its oxide on surface is handled; pre-then heat extraction moisture; preheating temperature is 150～350 ℃; it is characterized in that adopting isometrical double-roller rolling technology direct forming; magnesium alloy ingot after handling is put into smelting furnace; under shielding gas; controlled temperature is to carry out melting between 680～760 ℃, and the liquid magnesium alloy after the fusing will be cast roller and be preheating to 150～300 ℃ earlier by the isometrical twin-roll cast-rolling mill of horizontal before the casting; in the presence of shielding gas; control casting temperature is 680～760 ℃, and roll casting speed is 30～90m/min, and the liquid level of cast is controlled with the liquid magnesium alloy and the contact angle of casting roller; carry out casting under casting roller gap＜3mm condition; produce the magnesium alloy thin strip blank that thickness is 1.5～3.0mm, again through side cut, after the pickling; directly carry out cold rollingly, final production goes out the strip product of thickness＜1mm.
2. according to the manufacture method of the described high plastic magnesium alloy band of claim 1, it is characterized in that magnesium alloy smelting process and liquid magnesium alloy strip casting process all select for use argon gas as shielding gas.
3. according to the manufacture method of claim 1 or 2 described high plastic magnesium alloy bands, it is characterized in that magnesium alloy smelting process and liquid magnesium alloy strip casting process, the pressure of shielding gas is greater than 1 normal atmosphere.
4. according to the manufacture method of the described high plastic magnesium alloy band of claim 1, it is characterized in that the liquid level of pouring into a mould controls with the liquid magnesium alloy and the contact angle of casting roller, its angle is controlled in 40 °.
5. according to the manufacture method of the described high plastic magnesium alloy band of claim 1, it is characterized in that the pickling of cast-rolling thin strip base after, carry out the cold rolling of 40% draught.
6. according to the manufacture method of the described high plastic magnesium alloy band of claim 1, it is characterized in that after the magnesium alloy smelting temperature reaches design temperature, be incubated 10～30 minutes, begin casting then.
7. according to the manufacture method of the described high plastic magnesium alloy band of claim 1, it is characterized in that adopting isometrical twin-roll cast-rolling mill, its diameter is 300～1500mm, and roll surface width is 100～1500mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03134045 CN1207422C (en) | 2003-09-23 | 2003-09-23 | Manufacturing method of high-plasticity magnesium alloy band |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03134045 CN1207422C (en) | 2003-09-23 | 2003-09-23 | Manufacturing method of high-plasticity magnesium alloy band |
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| Publication Number | Publication Date |
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| CN1537969A CN1537969A (en) | 2004-10-20 |
| CN1207422C true CN1207422C (en) | 2005-06-22 |
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| CN 03134045 Expired - Fee Related CN1207422C (en) | 2003-09-23 | 2003-09-23 | Manufacturing method of high-plasticity magnesium alloy band |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366351C (en) * | 2006-01-26 | 2008-02-06 | 鞍山科技大学 | On line oil bath thermal treating twin roll casting rolling method and apparatus |
| DE102006036223B3 (en) * | 2006-08-03 | 2007-08-30 | Thyssenkrupp Steel Ag | Production line for producing a thin magnesium strip comprises a coiler having a coiling sleeve fixed coaxially to the rotary axis of a coiler mandrel |
| CN101239358B (en) * | 2008-03-06 | 2010-06-30 | 张明 | Double-roller casting rolling-hot continuous rolling method and equipment |
| CN101623699B (en) * | 2008-07-08 | 2012-09-05 | 山西银光华盛镁业股份有限公司 | Method for producing magnesium alloy anode plate of torpedo battery |
| CN101837368B (en) * | 2010-04-27 | 2012-02-01 | 新星化工冶金材料(深圳)有限公司 | Continuous casting and rolling molding method for magnesium alloy plate |
| CN104244617B (en) * | 2013-06-09 | 2018-05-29 | 比亚迪股份有限公司 | A kind of housing and its preparation method and application |
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