CN101037742A - Alloy plate strip for hand phone battery case and manufacturing method thereof - Google Patents

Alloy plate strip for hand phone battery case and manufacturing method thereof Download PDF

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Publication number
CN101037742A
CN101037742A CN 200710072044 CN200710072044A CN101037742A CN 101037742 A CN101037742 A CN 101037742A CN 200710072044 CN200710072044 CN 200710072044 CN 200710072044 A CN200710072044 A CN 200710072044A CN 101037742 A CN101037742 A CN 101037742A
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weight percent
accounts
total composition
battery case
alloy plate
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CN 200710072044
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Chinese (zh)
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CN100491564C (en
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苏堪祥
王国军
韩冰
卢杰
吴欣凤
孟繁平
徐涛
陶志民
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东北轻合金有限责任公司
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Abstract

Alloy plate trip for the battery case of mobil telephone and its preparation method is disclosed, in order to solve the problem that the alloy plate trip for the existing battery case of mobil telephone has poor stamping properties and the quality defect of the alloy is easy to be caused because of the complex arts. The alloy plate trip for the battery case of mobil telephone of the invention comprises Mn, which is 1.10-1.30 wt.% of overall composition, and Mg, which is 0.02-0.05 wt.% of overall composition. The method for preparing the alloy plate trip for the battery case of mobil telephone of the invention includes the steps of: smelting, casting, uniformizating, face milling, hot rolling, cold rolling and final finishing. The alloy plate trip for the battery case of mobil telephone of the invention has good-quality surface, high-precision thickness and good stamping properties, and all kinds of properties of the plate trip is steady with high intensity and higher plasticity and good deep punching moldability, and the quality defect of the alloy can be reduced effectively in case that the preparation method is simpler than traditional method.

Description

Alloy plate strip that hand phone battery case is used and manufacture method thereof

Technical field

The present invention relates to alloy plate strip and manufacture method thereof that a kind of hand phone battery case is used.

Background technology

China has been maximum mobile communication terminal producing country and country of consumption of the whole world.It is believed that breath Estate Division statistics, China has the selling market of nearly 1/3 output of global mobile phone and about 1/5 at present, is global most important mobile phone production and sales centers.According to statistics 2004 the end of the year China's mobile phone popularity rate surpassed 25%, this shows that China's mobile phone market is being contained great potential.As a kind of telecommunication terminal of the richest vigor, very large variation has taken place in mobile phone since being born.Multifunction, personalization, miniaturization are the development trends of mobile phone from now on, as power set---the battery of mobile phone of mobile phone operation, have become perfectly key of the common trend of mobile phone " intension " and " appearance ".In order to adapt to the development trend of mobile phone, researching and developing light small and exquisite battery of mobile phone has become one of emphasis problem of mobile phone manufacturer.In this case, battery of mobile phone more and more is subjected to the attention of battery of mobile phone producer with the research of material.In recent years, aluminium alloy plate, band just progressively replace original hand phone battery case material with its good comprehensive mechanical processing characteristics, good corrosion stability, light specific gravity, good performance of heat dissipation and powerful characteristics such as anti-electromagnetic interference performance---plastics PV and PVC material.China's cableless communication industry development is swift and violent, and China really possess tracking exchage components and parts ability to provide the auxiliary items also have only few projects such as battery of mobile phone, this new industry of battery of mobile phone will increase thereupon fast, so hand phone battery case is boundless with the market outlook of aluminium alloy plate, band.

Hand phone battery case requires high to the over-all properties of material.At first, hand phone battery case is shaped by punch process, and its deflection is big, the punching out operation is many, flushing technology is complicated, die design is accurate, and belongs to the punching press of asymmetric box type.As everyone knows, can punching course carry out relevant with factors such as material property, stamping Die Design and Sheet Metal Forming Technology parameters smoothly.Wherein, the performance of material is one of of paramount importance basic condition of punching press success or not, so all material must have good deep drawability, and every mechanical property must be stabilized in the scope of a strictness.Secondly, for inner battery structure is played effective provide protection, hand phone battery case also must have enough intensity and hardness under the prerequisite that guarantees necessary plasticity.The 3rd, in order to adapt to various environment for use, guarantee the work-ing life of battery, hand phone battery case must have good erosion resistance and chemical stability with material.The 4th, mobile phone is as a kind of communication tool of fashion, and its battery also must have the good surface appearance quality, therefore raw-material surface quality is also had very high requirement.Yet all there is deficiency in existing battery of mobile phone with the above-mentioned performance of alloy sheets.

Summary of the invention

Poor with the punching performance of alloy plate strip in order to solve existing battery of mobile phone, complex manufacturing easily causes the problem of finished product alloy mass defective, the invention provides alloy plate strip and manufacture method thereof that a kind of hand phone battery case is used.

The alloy plate strip that hand phone battery case of the present invention is used is by Si, Fe, Cu, Mn, Zn, Al, Mg and Ti make, the weight percent that described Si accounts for total composition is≤0.04%, the weight percent that Fe accounts for total composition is 0.40%~0.60%, the weight percent that Cu accounts for total composition is 0.07%~0.15%, the weight percent that Mn accounts for total composition is 1.10%~1.30%, the weight percent that Mg accounts for total composition is 0.02%~0.05%, the weight percent that Zn accounts for total composition is≤0.08%, the weight percent that Ti accounts for total composition is 0.02%~0.03%, and remainder is Al and impurity.

The manufacture method of the alloy plate strip that hand phone battery case of the present invention is used is finished by the following step

A, melting, adopt the gas-fired air furnace fusing during melting, changing in the resistance reverberatory furnace weight percent that accounts for total composition by Si then over to is≤0.04%, the weight percent that Fe accounts for total composition is 0.40%~0.60%, the weight percent that Cu accounts for total composition is 0.07%~0.15%, the weight percent that Mn accounts for total composition is 1.10%~1.30%, the weight percent that Mg accounts for total composition is 0.02%~0.05%, the weight percent that Zn accounts for total composition is≤0.08%, the weight percent that Ti accounts for total composition is 0.02%~0.03%, remainder is that the composition of Al and impurity requires to adjust chemical ingredients, add Al-Ti-B silk fining agent crystal grain thinning simultaneously, and carry out refining, degasification, after skimming melt changed over to and leave standstill stove and leave standstill;

B, casting after leaving standstill, adopt the method for ceramic filter to carry out the cleaning molten processing, control casting temp simultaneously, and the online Al-Ti-B silk fining agent that adds;

C, homogenizing, the ingot casting that casts out carries out homogenizing annealing;

D, mill face, before the hot rolling ingot casting is milled face and handle;

E, hot rolling, control hot rolling Heating temperature and temperature of hot-rolled end are produced parameters such as preceding concentration to emulsion, hydrophobic viscosity, acid number, newborn particle size, metal ion content and are rationally adjusted;

F, cold rolling, by the reasonable utilization of automatic control system, strict cold rolling thickness and precision of control and cold rolled sheet shape, final pass adopt roll to be rolled;

G, finishing are finished.

The alloy plate strip surface quality that hand phone battery case of the present invention is used is good, thickness and precision is high, punching performance is excellent, and the various stable performances of sheet material, and it is good that it has erosion resistance, and the intensity height has higher plasticity and good deep-draw formability.The manufacture method of the alloy plate strip that hand phone battery case of the present invention is used is simpler than traditional method, and can reduce the mass defect of finished product alloy effectively.

Embodiment

Embodiment one: the following present embodiment that specifies, present embodiment is by Si, Fe, Cu, Mn, Zn, Al, Mg and Ti make, the weight percent that described Si accounts for total composition is≤0.04%, the weight percent that Fe accounts for total composition is 0.40%~0.60%, the weight percent that Cu accounts for total composition is 0.07%~0.15%, the weight percent that Mn accounts for total composition is 1.10%~1.30%, the weight percent that Mg accounts for total composition is 0.02%~0.05%, the weight percent that Zn accounts for total composition is≤0.08%, Ti accounts for the weight percent 0.02%~0.03% of total composition, and remainder is Al and impurity.

Mn content has remarkable influence for alloy organizing and performance, and Mn has certain solution strengthening effect, can stop the recrystallization process of aluminium and aluminium alloy, improves recrystallization temperature, and passes through MnAl 6Dispersoid particle hinders recrystal grain and grows up, remarkable refinement recrystal grain, and Mn content reaches maximum value at the unit elongation of 0.8% o'clock strip material, and the intensity of material increases with the increase of Mn content in 1.82% (limit of solubility of Mn) scope.But Mn content surpasses at 1.6% o'clock, thick crisp hard MnAl will occur 6Phase to the influence of the bringing on a disaster property of ductility of product, is therefore determined Mn content the middle limit at this alloy composition, promptly between 1.1%~1.3%.

Fe is a kind of useful alloying element in the alloy, because Mn very easily produces grain segregation, can significantly improve recrystallization temperature again, alloy sheets after the cold deformation, band, in annealing process, low manganese first recrystallize in zone and grain growth, and non-recrystallization is gone back in high manganese zone, make the sheet material grain size extremely inhomogeneous, and iron can dissolve in MnAl 6In, form (FeMn) Al 6, reduce the segregation of Mn, make annealing sheet material obtain fine grain structure.But (FeMn) Al 6In the time of too much, can reduce the plasticity of alloy, so we are controlled at Fe content in 0.40%~0.60% scope.

Si can increase the hot cracking tendency of alloy, and can form (FeMn) 3SiAl 12Phase reduces the solubleness of Mn in aluminium, and alloy plasticity is reduced.Therefore control Si content≤0.04%.

Mg can improve the intensity of Al-Mn alloy, refinement recrystallized structure, but can reduce the half-finished surface luster of annealing, for the luminance brightness that guarantees the hand phone battery case surface has been carried out strict control to Mg content, require 0.02%~0.05%.

The increase of Cu content will significantly reduce the erosion resistance of material, but a spot of Cu can make the pitting attack of material become uniform corrosion, thereby be favourable.Cu content is controlled at 0.07%~0.15%.

Zn can reduce the corrosion stability of alloy, therefore to Zn content be controlled at≤0.08%.

Embodiment two: the following present embodiment that specifies, present embodiment is finished by the following step

A, melting, adopt the gas-fired air furnace fusing during melting, changing in the resistance reverberatory furnace weight percent that accounts for total composition by Si then over to is≤0.04%, the weight percent that Fe accounts for total composition is 0.40%~0.60%, the weight percent that Cu accounts for total composition is 0.07%~0.15%, the weight percent that Mn accounts for total composition is 1.10%~1.30%, the weight percent that Mg accounts for total composition is 0.02%~0.05%, the weight percent that Zn accounts for total composition is≤0.08%, the weight percent that Ti accounts for total composition is 0.02%~0.03%, remainder is that the composition of Al and impurity requires to adjust chemical ingredients, add Al-Ti-B silk fining agent crystal grain thinning simultaneously, and carry out refining, degasification, after skimming melt changed over to and leave standstill stove and leave standstill;

B, casting after leaving standstill, are adopted the method for ceramic filter to carry out the cleaning molten processing, thereby are improved melt weight, control casting temp simultaneously, and the online Al-Ti-B silk fining agent that adds, and prevent coarse grain;

C, homogenizing, the ingot casting that casts out are carried out chemical ingredients inequality and the tissue odds that homogenizing annealing is eliminated ingot casting, for the performance anisotropy of the finished product is given security;

D, mill face, before the hot rolling ingot casting is milled face and handle, eliminate defectives such as the cold shut that produces in the castingprocesses, segregation knurl, guarantee surface quality of products;

E, hot rolling, control hot rolling Heating temperature and temperature of hot-rolled end, guarantee the tissue of hot rolling woolen cloth, reduce the raw edges defective that alloy produces when hot rolling, use the emulsion of U.S. Houghton company, before producing parameters such as the concentration of emulsion, hydrophobic viscosity, acid number, newborn particle size, metal ion content are rationally adjusted and guarantee to be in the ideal condition of boundary lubrication between the roll and rolled piece in the course of hot rolling, to obtain good hot rolling surface quality, avoid the sticking generation of hindering, gnawing bad phenomenon such as roller of hot rolling;

F, cold rolling, reasonable utilization by automatic control system, strict cold rolling thickness and precision of control and cold rolled sheet shape, cold rolling oil adopts DF100 low sulfur and low aromatics base oil and adds 12 alcohol, parameters such as rolling oil viscosity, boiling range, acid number, saponification value, machine oil content are carried out strictness control, guarantee the good lubrication of cold-rolled process, to obtain the cold rolling surface weight of ideal, final pass adopts 0.16 μ m~0.32 μ m working roll to be rolled, and guarantees that finished surface roughness index is qualified;

G, finishing are finished.

Embodiment three: the following present embodiment that specifies, present embodiment is inserted annealing process in step F, and other step is with embodiment two.

Embodiment four: the following present embodiment that specifies, the smelting temperature of present embodiment steps A are 700 ℃~740 ℃, and other step is with embodiment three.The founding operation is by the strictness control to processes such as smelting temperature and refining, degasification, slagging-off, filtrations, hydrogen richness is strict controlled in the 0.15ml/100g, ingot quality defectives such as loose, pore, metal or nonmetal slag inclusion have effectively been reduced, ingot quality has reached the index of expection, has satisfied the strict demand of shell to material.

Embodiment five: the following present embodiment that specifies, the equal fiery temperature of present embodiment step C is 610 ℃~630 ℃, other step is with embodiment four.Main alloy element in the alloy is Mn, and in the semicontinuous casting process, because speed of cooling is very fast, and the spread coefficient of manganese atom is less, and most of manganese is present in the matrix with the form of supersaturated solid solution, and a part is with MnAl 6The form of compound and matrix form continuous net-shaped eutectic at crystal boundary, and other has and a spot ofly exists with thick hard crisp primary crystal.Without heat treated block primary crystal in the hot rolling process segment owing to be subjected to the effect of very big rolling pressure can be by abundant fragmentation, be strip along deformation direction and distribute.Though reduce a small amount of MnAl dimensionally to some extent 6Its property at parts of edges and corners of compound particle becomes more sharp-pointed, and cold working and finished products almost can not change this pattern, makes it to be retained in forever in the interior tissue of material.In goods deep-draw deformation process, material is subjected to the effect of external stress easily at sharp-pointed position germinating microcrack, and grain segregation very easily takes place in alloy under non-equilibrium crystallization condition, make Mn content high outside and low outside, make not of uniform size the causing of recrystal grain after the annealing, greatly reduce the crystal boundary bonding strength.Alloy cast ingot is found MnAl through the high power microscopic inspection after 550 ℃ of homogenizing are handled 6Taken place mutually to be partly dissolved, it is slick and sly that sharp-pointed corner angle become.When homogenization temperature surpasses 635 ℃, be accompanied by second the remelt and the gathering of primary crystal and grow up, the distribution of the Mn element in the matrix becomes inhomogeneous again, so the homogenization temperature of alloy is decided to be 610 ℃~630 ℃.

Embodiment six: the following present embodiment that specifies, the hot rolling Heating temperature of present embodiment step e are 480 ℃~520 ℃, temperature of hot-rolled end 〉=380 ℃, and other step is with embodiment five.The hot rolling Heating temperature in 480 ℃~520 ℃ scopes the time plasticity of alloy satisfy the hot rolling requirement, and can guarantee that temperature of hot-rolled end is more than 380 ℃.By the polarisation structure observation, tissue morphology is stable, and (surface structure that hot rolling blank contacts with roll is most of to be tiny recrystallized structure, core is because deflection is little, be a spot of recrystallized structure, crystal grain is thicker), and hot rolling blank limit portion raw edges tendency is little, and follow-up processing is had no adverse effects.When temperature of hot-rolled end is lower than 360 ℃, the hot rolling surface tissue contains Deformation structure, and along with the reduction of temperature, Deformation structure's content increases, and the raw edges defective after the hot rolling simultaneously increases the weight of, thus temperature of hot-rolled end should to be controlled at more than 380 ℃ be necessary.

Embodiment seven: the following present embodiment that specifies, the roll surface roughness of present embodiment step F are 0.16 μ m~0.32 μ m, and other step is with embodiment six.When roll surface roughness is 0.16 μ m~0.32 μ m, under good lubricating condition, after testing, can guarantee that the rolled piece surface irregularity is controlled at 0.20 μ m~0.35 μ m.

Embodiment eight: the following present embodiment that specifies, the sotck thinkness 9.0mm of present embodiment step F, other step is with embodiment seven.

Embodiment nine: the following present embodiment that specifies, the cold rolling of present embodiment step F oil adopt DF100 low sulfur and low aromatics base oil and add weight percent is 5%~8% 12 alcohol, and other step is with embodiment eight.

In the cold-rolled process, ROLLING OIL adopts DF100 low sulfur and low aromatics base oil and adds weight percent is 5%~8% 12 alcohol, can guarantee to be in condition of boundary lubrication between the roll and rolled piece in the distorted area, thereby obtain good cold rolling surface quality, guarantee that simultaneously product annealing rear surface do not have bad defectives such as oil mark.

Claims (9)

1, the alloy plate strip that hand phone battery case is used, it is characterized in that it is by Si, Fe, Cu, Mn, Zn, Al, Mg and Ti make, the weight percent that described Si accounts for total composition is≤0.04%, the weight percent that Fe accounts for total composition is 0.40%~0.60%, the weight percent that Cu accounts for total composition is 0.07%~0.15%, the weight percent that Mn accounts for total composition is 1.10%~1.30%, the weight percent that Mg accounts for total composition is 0.02%~0.05%, the weight percent that Zn accounts for total composition is≤0.08%, the weight percent that Ti accounts for total composition is 0.02%~0.03%, and remainder is Al and impurity.
2, the manufacture method of the alloy plate strip used of hand phone battery case is characterized in that it is finished by the following step
A, melting, adopt the gas-fired air furnace fusing during melting, changing in the resistance reverberatory furnace weight percent that accounts for total composition by Si then over to is≤0.04%, the weight percent that Fe accounts for total composition is 0.40%~0.60%, the weight percent that Cu accounts for total composition is 0.07%~0.15%, the weight percent that Mn accounts for total composition is 1.10%~1.30%, the weight percent that Mg accounts for total composition is 0.02%~0.05%, the weight percent that Zn accounts for total composition is≤0.08%, the weight percent that Ti accounts for total composition is 0.02%~0.03%, remainder is that the composition of Al and impurity requires to adjust chemical ingredients, add Al-Ti-B silk fining agent crystal grain thinning simultaneously, and carry out refining, degasification, after skimming melt changed over to and leave standstill stove and leave standstill;
B, casting after leaving standstill, adopt the method for ceramic filter to carry out the cleaning molten processing, control casting temp simultaneously, and the online Al-Ti-B silk fining agent that adds;
C, homogenizing, the ingot casting that casts out carries out homogenizing annealing;
D, mill face, before the hot rolling ingot casting is milled face and handle;
E, hot rolling, control hot rolling Heating temperature and temperature of hot-rolled end are produced parameters such as preceding concentration to emulsion, hydrophobic viscosity, acid number, newborn particle size, metal ion content and are rationally adjusted;
F, cold rolling, by the reasonable utilization of automatic control system, strict cold rolling thickness and precision of control and cold rolled sheet shape, final pass adopt roll to be rolled;
G, finishing are finished.
3, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2 is characterized in that inserting in the step F annealing process.
4, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2, the smelting temperature that it is characterized in that steps A is 700 ℃~740 ℃.
5, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2, the equal fiery temperature that it is characterized in that step C is 610 ℃~630 ℃.
6, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2, the hot rolling Heating temperature that it is characterized in that step e is 480 ℃~520 ℃, temperature of hot-rolled end 〉=380 ℃.
7, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2, the roll surface roughness that it is characterized in that step F is 0.16 μ m~0.32 μ m.
8, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2 is characterized in that the sotck thinkness 9.0mm of step F.
9, the manufacture method of the alloy plate strip used of hand phone battery case according to claim 2, the cold rolling oil that it is characterized in that step F adopt DF100 low sulfur and low aromatics base oil and add weight percent is 5%~8% 12 alcohol.
CNB2007100720445A 2007-04-17 2007-04-17 Alloy plate strip for hand phone battery case and manufacturing method thereof CN100491564C (en)

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CN102828074A (en) * 2012-08-29 2012-12-19 东北轻合金有限责任公司 Aluminum-based strip for compounding steel with aluminum and manufacturing method of aluminum-based strip
CN105039786A (en) * 2011-02-02 2015-11-11 日本轻金属株式会社 Aluminum alloy sheet for battery case having good moldability and weldability
CN105543520A (en) * 2015-12-31 2016-05-04 广西南南铝加工有限公司 Preparing method of aluminum alloy base material for electronic product shell
CN105633316A (en) * 2015-12-18 2016-06-01 宇龙计算机通信科技(深圳)有限公司 Aluminum-alloy battery cover, preparation method thereof and electronic device
CN107723497A (en) * 2017-10-04 2018-02-23 长沙仲善新能源科技有限公司 Aluminum alloy strip for mobile phone battery shell and its manufacture method
CN108559878A (en) * 2018-03-08 2018-09-21 常州常发制冷科技有限公司 Battery case aluminum alloy strip and preparation method thereof
CN109047330A (en) * 2018-10-22 2018-12-21 武汉威华铝业有限公司 Method for processing sheet material
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CN105063428B (en) * 2011-02-02 2017-08-08 日本轻金属株式会社 The aluminium alloy plate for battery case of formability and welding property excellent
CN105039786A (en) * 2011-02-02 2015-11-11 日本轻金属株式会社 Aluminum alloy sheet for battery case having good moldability and weldability
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CN105039786B (en) * 2011-02-02 2017-08-22 日本轻金属株式会社 The aluminium alloy plate for battery case of formability and welding property excellent
CN105112731B (en) * 2011-02-02 2017-06-13 日本轻金属株式会社 The aluminium alloy plate for battery case of formability and welding property excellent
CN102828074A (en) * 2012-08-29 2012-12-19 东北轻合金有限责任公司 Aluminum-based strip for compounding steel with aluminum and manufacturing method of aluminum-based strip
CN105633316A (en) * 2015-12-18 2016-06-01 宇龙计算机通信科技(深圳)有限公司 Aluminum-alloy battery cover, preparation method thereof and electronic device
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CN107723497A (en) * 2017-10-04 2018-02-23 长沙仲善新能源科技有限公司 Aluminum alloy strip for mobile phone battery shell and its manufacture method
CN108559878A (en) * 2018-03-08 2018-09-21 常州常发制冷科技有限公司 Battery case aluminum alloy strip and preparation method thereof
CN109047330A (en) * 2018-10-22 2018-12-21 武汉威华铝业有限公司 Method for processing sheet material
CN109877539A (en) * 2019-03-12 2019-06-14 福建省闽发铝业股份有限公司 A kind of aluminium alloy mobile phone shell plate hot extrusion molding technique
CN109877539B (en) * 2019-03-12 2020-12-08 福建省闽发铝业股份有限公司 Hot extrusion forming process for plate for aluminum alloy mobile phone shell

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