CN108130464A - It is a kind of for the rolling mill practice of high surface aluminium alloy sheet of mobile phone Al-alloy casing and the preparation method of aluminium alloy sheet - Google Patents

Abstract

The present invention provides a kind of rolling mill practices of aluminum alloy plate materials, include the following steps, by aluminium alloy cast ingot by homogenization heat treatment, hot rolling, cold rolling, intermediate annealing and again after cold rolling, obtain aluminum alloy plate materials；The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.The present invention is based on alloying components, with reference to the high-low time tissue of alloy, recrystallize degree and grain size, employ specific rolling mill practice, ensure that the high appearance requirement of subsequent product from inside to outside, eliminate material line and black line defect.And any noble metal or rare element are not added in blending process provided by the invention, with reference to specific technological parameter, make rational, feasible special production and processing technology, ensure that production alloy aluminium material amount of large quantities is stable, consistent, greatly reduce resulting rejection rate, process is simple, the promotion and application being suitable for industrialized large-scaled production, and has important practical significance and market prospects.

Description

A kind of rolling mill practice of high surface aluminium alloy sheet for mobile phone Al-alloy casing and The preparation method of aluminium alloy sheet

Technical field

The invention belongs to aluminum alloy materials technical fields, are related to the rolling mill practice and aluminum alloy plate materials of a kind of aluminum alloy plate materials Preparation method more particularly to a kind of high surface aluminium alloy sheet for mobile phone Al-alloy casing rolling mill practice and aluminium alloy The preparation method of thin plate.

Background technology

Aluminium alloy is a kind of alloy using aluminium as base, and main alloy element has copper, silicon, magnesium, zinc and manganese.Aluminium alloy is industry In most widely used a kind of non-ferrous metal structural material.With the rapid development of economy, aluminum alloy materials are in civil field, machine It has been widely applied in tool manufacture, ship and chemical industry, especially in recent years, along with global economic integration, mobile phone application Fast development has also driven mobile phone is manufacturing to flourish, and the 3C Product based on mobile phone, as the Iphone first generation exists Aluminium alloy just being employed for the first time within 2007 and doing rear cover, being also increasingly proposed in major cell phone manufacturer in recent years more there is aluminium to close The product of golden shell, because easy to process, flexibility is high, and class is high, can effectively improve added value of product, be able to obtain in electronics industry Extensive utilization has been arrived, has not only been mainly used for the high-end smartphones of the brands such as Samsung, Huawei, OPPO, millet, is also used in large scale Tablet computer fuselage, removable computer shell, movable power shell etc., are widely applied, the market demand is huge.

Aluminium section bar shell is the shell typically processed on aluminum alloy plate materials, and flexibility is high, and depth can arbitrarily be cut It cuts, there is circuit board slot in general inside, as long as circuit board is inserted directly into, is fixed without row again, convenience is other The shell of type is incomparable, generally use one-step die casting technology.Existing conventional Al-alloy casing is usually all Using CNC machine (high speed drill attacks center), by DDG links, by aluminum alloy plate materials, accurately milling is into regular three-D volumes, then slightly Milling and each position of finish-milling inner cavity, then outer surface is rough milled and finish-milling, and be aided with corresponding chemistry to surfaces externally and internally Processing, then polishing treatment；The surface effect of wherein frosted also needs to carry out at sandblasting.Later, to ensure that aluminium alloy is stablized, no It is interfered by extraneous factors such as sweat, it is necessary to carry out anodized, be aoxidized surface by anodic oxidation, be formed Fine and close, hard oxidation film is more wear-resisting and be not easy to stain.

Exactly because phone housing is appearance leading factor product, so non-for the surface requirements of raw material aluminum alloy plate materials Chang Gao；Preparation more important is Al-alloy casing includes punching press, repeatedly many complicated preparation processes such as machining and oxidation, And the thickness of shell is very thin, so be not to be merely present in appearance surfaces for the appearance requirement of aluminum alloy plate materials, and It is from inside to outside, regardless of milling to which thickness, to require the requirement with high surface.And as market is to handset shell aluminium Surface quality requirements are continuously improved, and almost zero defect are required to aluminum alloy rolling sheeting anodic oxidation rear surface, mainly including material Expect that line defect and black line defect, the requirement of especially material line are almost harsh.But existing production technology still can not be complete Solve the problem of that there are high rejection rates for material line defect that handset shell is likely to occur and black line defect.

Thus, a kind of method how is found, the high surface Al-alloy casing of mobile phone can be prepared, rate of reducing the number of rejects and seconds has become For one of many line researchers and production application manufacturer urgent problem to be solved in the industry.

Invention content

In view of this, the technical problem to be solved in the present invention is that providing a kind of rolling mill practice of aluminum alloy plate materials and aluminium closes The rolling mill practice and aluminium of the preparation method of golden plate material, particularly a kind of high surface aluminium alloy sheet for mobile phone Al-alloy casing The preparation method of latten, using rolled aluminium alloy sheet of the present invention, in the mobile phone Al-alloy casing of preparation, surface property Excellent, there is no material line defects and black line defect, have relatively low rejection rate.

The present invention provides a kind of rolling mill practices of aluminum alloy plate materials, include the following steps：

By aluminium alloy cast ingot by homogenization heat treatment, hot rolling, cold rolling, intermediate annealing and again after cold rolling, obtain aluminium and close Golden plate material；

The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

Preferably, the temperature of the homogenization heat treatment of 5 line aluminium alloy is 460~470 DEG C；

The temperature of the homogenization heat treatment of 6 line aluminium alloy is 540~550 DEG C；

The time of the homogenization heat treatment for 20~for 24 hours.

Preferably, the start rolling temperature of the hot rolling of 5 line aluminium alloy is 410~430 DEG C；

The start rolling temperature of the hot rolling of 6 line aluminium alloy is 480~500 DEG C；

The finishing temperature of the hot rolling is 320~350 DEG C；

The total deformation of the hot rolling is more than or equal to 70%.

Preferably, the total deformation of the cold rolling is 70~90%；

Thickness after the cold rolling is 1.5~3.0mm；

The deformation allowance of the cold rolling again is 60~70%；

The passage of the cold rolling again is 2~3 times.

Preferably, the intermediate annealing is annealing or air cushion furnace annealing under protective gas；

The temperature of the intermediate annealing is 360~480 DEG C；

The time annealed under the protective gas is 3~8h；

The time of the air cushion furnace annealing is 5~10min.

Preferably, when the aluminum alloy plate materials are 6 line aluminium alloy plank, after the cold rolling again, solution hardening is further included And artificial aging；

The temperature of the solid solution is 520~550 DEG C；

The soaking time of the solid solution is 8~10min；

The temperature of the artificial aging is 155~165 DEG C；

The time of the artificial aging is 12~16h.

Preferably, 5 line aluminium alloy includes 5252 aluminium alloys；

6 line aluminium alloy includes 6061 aluminium alloys；

The aluminum alloy plate materials are aluminium alloy sheet；

The thickness of the aluminum alloy plate materials is 0.5~1.8mm；

The state of the 5 line aluminium alloy plank is H14 states；

The state of the 6 line aluminium alloy plank is T6 states.

The present invention also provides a kind of production methods of aluminum alloy plate materials, include the following steps：

1) aluminium alloy stock after dispensing is subjected to melting and casting, obtains aluminium alloy cast ingot；

2) by the aluminium alloy cast ingot that above-mentioned steps obtain after the rolling mill practice described in above-mentioned technical proposal any one, Obtain aluminum alloy plate materials；

The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

Preferably, the temperature of the melting is 720~760 DEG C；

The time of the melting is 5~10h；

It is described to be cast into semi-continuous casting；

The temperature of the casting of 5 line aluminium alloy is 720~750 DEG C；

The speed of the casting is 45~60mm/min；

The cooling water flow of the casting is 25~45m³/h；

The temperature of the casting of 6 line aluminium alloy is 720~750 DEG C；

The speed of the casting is 45~50mm/min；

The cooling water flow of the casting is 20~40m³/h。

Preferably, the step 1) is specially：

11) by aluminium alloy stock after dispensing, shove charge fusing obtains raw material melt；

12) after the raw material melt that above-mentioned steps obtain being carried out standing refining, the fining agent containing Ti is added in, using online After degasification and on-line filtration, alloy melt is obtained；It is described stand refining the specific steps are refined, stood and again successively Refining；

13) alloy melt for obtaining above-mentioned steps obtains aluminium alloy cast ingot after casting.

The present invention provides a kind of rolling mill practices of aluminum alloy plate materials, include the following steps, by aluminium alloy cast ingot by equal Heat treatment, hot rolling, cold rolling, intermediate annealing and again after cold rolling are homogenized, obtains aluminum alloy plate materials；The aluminium alloy is aluminium including 5 Alloy and/or 6 line aluminium alloys.Compared with prior art, the present invention is directed to the high surface requirements of existing mobile phone Al-alloy casing, Especially to flawless high surface requirements after aluminum alloy rolling sheeting anodic oxidation, and the preparation process of phone housing answers Miscellaneous, the thickness of shell is again thin, thus it is big there are difficulty, it is inside and outside to require high situation, and existing Al-alloy casing still has , there is high rejection rate in material line defect and black line defect.

The present invention starts with from the raw material aluminum alloy plate materials of mobile phone Al-alloy casing, will with reference to the intensity of mobile phone Al-alloy casing It sums the appearance requirement on high surface, has carried out creative selection and combination especially for the rolling mill practice of aluminium alloy, employed Specific rolling mill practice is simultaneously aided with specific technological parameter, ensure that the high appearance requirement of product from inside to outside, eliminates Material line and black line defect.The present invention incorporates the alloying component of different aluminum alloys material, with reference to the high-low time tissue of alloy, then Crystallization degree and grain size, particularly roll procedure of processing, optimize the hot rolling, cold rolling and heat treatment production work of alloy material Skill ensures that aluminium alloy Homogenization Treatments technique, cold rolling, intermediate annealing, aging technique are mutually matched, realizes the production of alloy material Product are shaped, and realize rolled plate industrialized production, it is ensured that production alloy aluminium material amount of large quantities is stable, consistent.And this hair Any noble metal or rare element are not added in the mobile phone Al-alloy casing of bright offer, pass through the inventive combination to process and choosing It selects, with reference to specific technological parameter, makes rational, feasible special production and processing technology, it is ensured that production alloy of large quantities It is aluminium stable quality, consistent, so as to eliminate the need for material line defect and black line defect on the aluminum alloy plate materials on the basis of, significantly Resulting rejection rate is reduced, and process is simple, the promotion and application being suitable for industrialized large-scaled production have important reality Border meaning and market prospects.

Experimental study and industrialized mass production show according to the molten of 5 systems and 6 line aluminium alloy handset shell materials The high surface aluminium alloy rolled sheet metal that the optimization processing technologies such as casting is made, rolls, quenching, timeliness are produced, the anodic oxygen after CNC The defects of change, aluminium alloy handset shell material structure is fine and close, no black line, piebald, material line and sand holes；And the punch forming of material Performance, cutting machining, corrosion resistance are satisfied by requirement.

Description of the drawings

Appearance photos of the Fig. 1 for 5252 aluminum alloy plate materials after 1 Anodic Oxidation of the embodiment of the present invention；

Fig. 2 is the appearance photo of 5252 aluminium alloy handset shells prepared by the embodiment of the present invention 1；

Appearance photos of the Fig. 3 for 6061 aluminum alloy plate materials after 3 Anodic Oxidation of the embodiment of the present invention；

Fig. 4 is the appearance photo of 6061 aluminium alloy handset shells prepared by the embodiment of the present invention 3.

Specific embodiment

For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, still It should be appreciated that these descriptions are intended merely to the feature and advantage further illustrated the present invention rather than to invention claim Limitation.

All raw materials of the present invention, are not particularly limited its source, buying on the market or according to people in the art Known to member prepared by conventional method.

All raw materials of the present invention, are not particularly limited its purity, and present invention preferably employs technical pures or aluminium alloy to prepare The purity requirement of field routine.

All raw materials of the present invention, the trade mark and abbreviation belong to this field routine trade mark and abbreviation, each trade mark and abbreviation In the field of its associated uses be it is explicit, those skilled in the art according to the trade mark, abbreviation and corresponding purposes, It can be commercially available from city's mid-sales or conventional method is prepared.

Technique used in the present invention, abbreviation belong to the conventional abbreviation in this field, the specific steps of each abbreviation and conventional ginseng Number is explicit in its related field, and those skilled in the art can be realized in conventional manner according to referred to as.

The present invention provides a kind of rolling mill practices of aluminum alloy plate materials, include the following steps：

By aluminium alloy cast ingot by homogenization heat treatment, hot rolling, cold rolling, intermediate annealing and again after cold rolling, obtain aluminium and close Golden plate material；

The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

The production method of the invention for preferably additionally providing a kind of aluminum alloy plate materials including the rolling technique, including following Step：

1) aluminium alloy stock after dispensing is subjected to melting and casting, obtains aluminium alloy cast ingot；

2) by the aluminium alloy cast ingot that above-mentioned steps obtain by hot rolling, cold rolling, intermediate annealing and again after cold rolling, aluminium is obtained Sheet alloy；

The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

The present invention is to aluminum alloy materials ingredient, form, size and condition selecting and ratio prepared in above-mentioned preparation process The aluminum alloy materials ingredient corresponding to aluminum alloy plate materials in example and corresponding optimum principle, with mobile phone Al-alloy casing, shape State, size and condition selecting and ratio and corresponding optimum principle can be corresponded to, and this is no longer going to repeat them.

Present invention preferably provides a kind of mobile phone Al-alloy casing, the Al-alloy casing by aluminum alloy plate materials it is stamped, It is obtained after machining and oxidation；

The aluminum alloy plate materials include 5 line aluminium alloy planks and/or 6 line aluminium alloy planks；

5 line aluminium alloy includes 5252 aluminium alloys；

6 line aluminium alloy includes 6061 aluminium alloys.

The definition of the Al-alloy casing is not particularly limited in the present invention, with mobile phone aluminium well known to those skilled in the art Alloy shell, those skilled in the art can be selected according to practical situations, product requirement and quality requirement and Adjustment, Al-alloy casing of the present invention is preferably the aluminum alloy casing of mobile phone, more preferably the aluminium alloy rear shell of mobile phone.

The concrete mode, step and parameter of the punching press, machining and oxidation is not particularly limited in the present invention, with ability Concrete mode, step and the ginseng of punching press, machining and oxidation in mobile phone Al alloy shell production procedure known to field technique personnel Number, those skilled in the art can be selected and adjusted according to practical situations, product requirement and quality requirement.

5 line aluminium alloy of the present invention is specifically chosen as 5252 aluminium alloys, its ingredient is not particularly limited in the present invention, with 5252 aluminium alloy well known to those skilled in the art into being grouped as, those skilled in the art can be according to practical application feelings Condition, product requirement and quality requirement are selected and are adjusted, and the present invention is carried further to eliminate material line defect and black line defect The stability and homogeneity of high product, rate of reducing the number of rejects and seconds, 5252 aluminium alloy is more preferably improved 5252 aluminium alloy, described 5252 aluminium alloys into being grouped as particularly preferably consisting of：

In the composition and content of 5 line aluminium alloy of the present invention, the mass content of the Cu is preferably 0.05%~ 0.08%, more preferably 0.055%~0.075%, more preferably 0.06%~0.07%.The mass content of the Mg is preferably 2.3%~2.6%, more preferably 2.35%~2.55%, more preferably 2.4%~2.5%.Impurity as aluminum alloy materials In, the mass content of the Si can be 0.01%~0.06% preferably≤0.06%, can be 0.02%~0.05%, Can be 0.03%~0.04%.The mass content of the Fe can be 0.01%~0.08%, Ke Yiwei preferably≤0.08% 0.02%~0.07%, or 0.04%~0.05%.The mass content of the Mn preferably≤0.03%, Ke Yiwei 0.01%~0.03%, can be 0.013%~0.027%, or 0.015%~0.025%.The quality of the V contains Amount can be 0.01%~0.05% preferably≤0.05%, can be 0.02%~0.04%, or 0.025%~ 0.035%.The mass content of the Zn can be 0.01%~0.03% preferably≤0.03%, can be 0.012%~ 0.028%, or 0.015%~0.025%.The mass content of the Ti can be 0.001% preferably≤0.015% ~0.015%, can be 0.003%~0.012%, or 0.005%~0.010%.In the present invention described 5252 Other impurities element can also be included in the composition and content of aluminium alloy, single content is preferably smaller than equal to 0.05%, totally Content is preferably smaller than equal to 0.15%, more preferably less than or equal to 0.1%.

In the composition and content of 6 line aluminium alloy of the present invention, the mass content of the Si is preferably 0.55%~ 0.65%, more preferably 0.57%~0.63%, more preferably 0.59%~0.61%.The mass content of the Cu is preferably 0.10%~0.25%, more preferably 0.13%~0.23%, more preferably 0.15%~0.25%.The mass content of the Mg Preferably 0.90%~1.20%, more preferably 0.95%~1.15%, more preferably 1.0%~1.1%.The quality of the Cr Content is preferably 0.15%~0.25%, more preferably 0.17%~0.23%, more preferably 0.19%~0.21%.As aluminium In the impurity of alloy material, the mass content of the Fe can be 0.01%~0.12%, Ke Yiwei preferably≤0.12% 0.03%~0.10%, or 0.05%~0.08%.The mass content of the Mn preferably≤0.10%, Ke Yiwei 0.01%~0.10%, can be 0.03%~0.08%, or 0.05%~0.06%.The mass content of the Ti is excellent Choosing≤0.015% can be 0.001%~0.015%, can be 0.003%~0.012%, or 0.005%~ 0.010%.Other impurities element can also be included in the composition of 6 line aluminium alloy and content in the present invention, it is single to contain Amount is preferably smaller than equal to 0.05%, and overall content is preferably smaller than equal to 0.15%, more preferably less than or equal to 0.1%.

The definition of above-mentioned degree is not particularly limited in the present invention, with aluminium alloy well known to those skilled in the art The definition of conventional degree, the above-mentioned degree of the present invention are both preferably mass percentage content.

The form of the aluminum alloy materials is not particularly limited in the present invention, with conventional aluminium well known to those skilled in the art The form of alloy, those skilled in the art can be selected according to practical situations, product requirement and quality requirement And adjustment, aluminum alloy plate materials of the present invention are preferably aluminium alloy sheet.

The specific size of the aluminium alloy sheet is not particularly limited in the present invention, with well known to those skilled in the art normal The size of aluminium alloy sheet is advised, those skilled in the art can be according to practical situations, product requirement and quality requirement It being selected and is adjusted, the thickness of aluminum alloy plate materials of the present invention is preferably 0.5~1.8mm, more preferably 0.8~1.5mm, More preferably 1.0~1.3mm.

The state of the 5 line aluminium alloy plank is not particularly limited in the present invention, with well known to those skilled in the art normal The state of aluminium alloy is advised, those skilled in the art can carry out according to practical situations, product requirement and quality requirement Selection and adjustment, the state of 5 line aluminium alloy plank of the present invention is preferably H states, more preferably H14 states.

The state of the 6 line aluminium alloy plank is not particularly limited in the present invention, with well known to those skilled in the art normal The state of aluminium alloy is advised, those skilled in the art can carry out according to practical situations, product requirement and quality requirement Selection and adjustment, the state of 6 line aluminium alloy plank of the present invention is preferably T states, more preferably T6 states.

Aluminium alloy stock is carried out melting and casting by the present invention after dispensing first, obtains aluminium alloy cast ingot.

The ratio and sequence of the dispensing is not particularly limited in the present invention, with this eka-aluminum well known to those skilled in the art The ratio and sequence of the dispensing of alloy, those skilled in the art can be according to practical condition, product requirement and quality It is required that being selected and being adjusted, the present invention eliminates material to be further ensured that the high appearance requirement of final products from inside to outside Expect line and black line defect, in the blending process, the Fe contents control in the aluminium alloy stock be less than the aluminium alloy into It is grouped as middle Fe contents.In the blending process, the iron implements contacted with raw material melt carry out coating treatment, to prevent member Plain Fe enters in aluminum-system.Specifically, it is not individually added into during dispensing of the present invention, in the aluminium alloy stock containing gold Belong to iron and/or ferroalloy, preferably by controlling the Fe contents in remaining raw material, reach the control requirement of Fe contents.In addition, this hair During the bright dispensing, titanium and/or aluminium titanium intermediate alloy are further preferably added without, to ensure that element ti premature will not enter aluminium alloy In system, prevent from leading to sheet alloy stain, black line defect because of Ti aggregations.

Specifically, the present invention is preferably all using new aluminium dispensing, more preferably 99.85% and Yi Shang grade high refined aluminium, And ensure the Ti contents summation in waste material and aluminium ingot preferably≤0.005%, more preferably≤0.0045%, more preferably≤ 0.004%.

The parameter of the melting is not particularly limited in the present invention, with such aluminium alloy well known to those skilled in the art The step of melting and parameter, those skilled in the art can according to practical condition, product requirement and quality requirement into Row selection and adjustment, the temperature of melting of the present invention is preferably 720~760 DEG C, more preferably 730~750 DEG C, more preferably 735~745 DEG C.The time of melting of the present invention is preferably 5~10h, more preferably 5~9h, more preferably 5~8h.

The parameter of the casting is not particularly limited in the present invention, with such aluminium alloy well known to those skilled in the art The step of casting and parameter, those skilled in the art can according to practical condition, product requirement and quality requirement into Row selection and adjustment, the mode of casting of the present invention is preferably semi-continuous casting.The casting speed of casting of the present invention is excellent It is selected as 45~60mm/min, more preferably 48~58mm/min, more preferably 50~55mm/min.Casting of the present invention it is cold But water flow is preferably 20~45m³/ h, more preferably 25~40m³/ h, more preferably 30~35m³/h.Casting of the present invention Temperature be preferably 720~750 DEG C, more preferably 725~745 DEG C, more preferably 730~740 DEG C.

More specifically, the casting speed of 5 line aluminium alloy casting of the present invention is preferably 45~60mm/min, more preferably 48~58mm/min, more preferably 50~55mm/min.The cooling water flow of the casting of 5 line aluminium alloy of the present invention is preferably 25~45m³/ h, more preferably 27~43m³/ h, more preferably 30~40m³/h.The temperature of the casting of 5 line aluminium alloy of the present invention Preferably 720~750 DEG C of degree, more preferably more preferably 725~745 DEG C, 730~740 DEG C.More specifically, the present invention is above-mentioned It is most preferably the casting parameter when 5 line aluminium alloy cast ingot specifications are 520 × 1300mm to cast parameter.

The casting speed of 6 line aluminium alloy casting of the present invention is preferably 45~50mm/min, more preferably 46~49mm/ Min, more preferably 47~48mm/min.The cooling water flow of the casting of 6 line aluminium alloy of the present invention is preferably 20~40m³/ H, more preferably 22~38m³/ h, more preferably 25~35m³/h.The temperature of the casting of 6 line aluminium alloy of the present invention is preferably 720~750 DEG C, more preferably 725~745 DEG C, more preferably 730~740 DEG C.More specifically, the above-mentioned casting parameter of the present invention Casting parameter most preferably when 6 line aluminium alloy cast ingot specifications are 510 × 1360mm.

The present invention eliminates material line and black line lacks to be further ensured that the high appearance requirement of final products from inside to outside It falls into, the step 1) is particularly preferred as following steps：

11) by aluminium alloy stock after dispensing, shove charge fusing obtains raw material melt；

12) the raw material melt that above-mentioned steps obtain is subjected to standing refining, using after line degasification and on-line filtration, obtained To alloy melt；

13) alloy melt for obtaining above-mentioned steps obtains aluminium alloy cast ingot after casting.

For the present invention first by aluminium alloy stock after dispensing, shove charge fusing obtains raw material melt.

The present invention eliminates material line and black line lacks to be further ensured that the high appearance requirement of final products from inside to outside It falls into, in the shove charge fusion process, the iron implements contacted with raw material melt carry out coating treatment, to prevent element of Fe from entering In aluminum-system.

The raw material melt that above-mentioned steps obtain then is carried out standing refining by the present invention, using online degasification and online mistake After filter, alloy melt is obtained.

The present invention to it is described stand refine the step of and parameter be not particularly limited, with it is well known to those skilled in the art this The step of standing refining of class aluminium alloy and parameter, those skilled in the art can want according to practical condition, product It asks and quality requirement is selected and adjusted, the refinery gas of the present invention for standing refining is preferably inert gas, more preferably For argon gas.The time of the present invention for standing refining is preferably 70~80min, more preferably 72~78min, more preferably 74~ 76min.The temperature for standing refining is preferably 720~750 DEG C, more preferably 725~745 DEG C, more preferably 730~740 ℃。

Exterior quality of the present invention further to promote alloy product, optimization and complete process flow, it is described to stand essence The specific steps of refining are more preferably refined, stood and are refined again successively.The time of refining of the present invention is preferably 18 ~23min, more preferably 19~23min, more preferably 20~23min.The time of the standing is preferably 30~40min, more Preferably 32~38min, more preferably 34~36min.The time refined again be 18~23min, more preferably 19~ 23min, more preferably 20~23min.

The present invention eliminates material line and black line lacks to be further ensured that the high appearance requirement of final products from inside to outside It falling into, particularly preferred stokehold is unworthy of Ti, and after refining is stood, before online degasification, the online fining agent refinement added in containing Ti Aluminium alloy melt does not use Al-5Ti-1B bulk fining agents more preferably.The present invention does not have the selection of the fining agent containing Ti Especially limitation, with fining agent of the routine well known to those skilled in the art containing Ti, those skilled in the art can be according to reality The border condition of production, product requirement and quality requirement are selected and are adjusted, and the present invention is stringent control Ti contents, prevents from gathering because of Ti Collection leads to sheet alloy stain, black line defect, and the fining agent containing Ti is preferably Filamentous fining agent.The fining agent containing Ti Al-3Ti-1B fining agents and/or Al-5Ti-0.2B fining agents are preferably included, the more preferably fining agent containing Ti includes Al-3Ti- 1B fining agents or Al-5Ti-0.2B fining agents.The addition of fining agent of the present invention containing Ti is preferably 1.2~2.0kg/ TAl, more preferably 1.4~1.8kg/tAl, more preferably 1.5~1.7kg/tAl.It is specifically as follows Al-3Ti-1B fining agents 1.5~1.8kg/tAl, more preferably 1.0~1.2kg/tAl of Al-5Ti-0.2B fining agents.

The step of present invention is to the online degasification and parameter are not particularly limited, with it is well known to those skilled in the art this The step of online degasification of class aluminium alloy and parameter, those skilled in the art can want according to practical condition, product It asks and quality requirement is selected and adjusted, the degasification gas of online degasification of the present invention is preferably inert gas and chlorine. The melt temperature of the online degasification is preferably 720~750 DEG C, more preferably 725~745 DEG C, more preferably 730~740 DEG C. The flow of the inert gas of the online degasification is preferably 2.8~4.0m³/ h, more preferably 3.0~3.8m³/ h, more preferably 3.2~3.6m³/h.The flow of the chlorine of the online degasification is preferably 0.01~0.03m³/ h, more preferably 0.013~ 0.027m³/ h, more preferably 0.015~0.025m³/h.More specifically, the hydrogen content of the melt of the present invention after line degasification Preferably smaller than it is equal to 0.15cm³/ 100gAl, more preferably less than or equal to 0.13cm³/ 100gAl, more preferably less than or equal to 0.10cm³/ 100gAl.The invention is intended to strictly control the hydrogen content of alloy melt, hydrogen is preferably surveyed by liquid and controls hydrogen content in time, more The preferably each heat of body carries out liquid and surveys hydrogen.

The step of present invention is to the on-line filtration and parameter are not particularly limited, with it is well known to those skilled in the art this Class aluminium alloy the on-line filtration the step of and parameter, those skilled in the art can be according to practical condition, products It is required that and quality requirement selected and adjusted, the filter plate mesh number of on-line filtration of the present invention is preferably 40~60PPI, more excellent It is selected as 50PPI, more preferably 60PPI.

The alloy melt that the present invention finally obtains above-mentioned steps obtains aluminium alloy cast ingot after casting.

The present invention has obtained aluminium alloy cast ingot by above-mentioned steps.The present invention is to the parameter of the aluminium alloy cast ingot without spy It does not limit, with the parameter of common process metaplasia well known to those skilled in the art production aluminium alloy cast ingot, people in the art Member can be selected and adjusted according to practical condition, product requirement and quality requirement, aluminium alloy cast ingot of the present invention Length be preferably 4800~5800mm, more preferably 5000~5600mm, more preferably 5200~5400mm.It is of the present invention The width of aluminium alloy cast ingot is preferably 1300~1360mm, can be 1310~1350mm, or 1320~1340mm.This The thickness for inventing the aluminium alloy cast ingot is preferably 510~520mm, can be 512~518mm, or 514~516mm.

The present invention and then the aluminium alloy cast ingot for obtaining above-mentioned steps pass through hot rolling, cold rolling, intermediate annealing and cold rolling again Afterwards, aluminum alloy plate materials are obtained；The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

The present invention for further promoted alloy product exterior quality, optimization and complete process flow, the hot rolling it It is preceding preferably to further include homogenization heat treating step, obtain the aluminium alloy cast ingot after homogenization heat treatment.

The step of present invention is heat-treated the homogenization and parameter are not particularly limited, with known to those skilled in the art Such aluminium alloy homogenization heat treatment the step of and parameter, those skilled in the art can be according to actual production feelings Condition, product requirement and quality requirement are selected and are adjusted, and design and selection of the present invention for cooperation alloy compositions further carry The high surface property of alloy product is risen, the homogenization heat treatment preferably includes the homogenization heat treating step of 5 line aluminium alloys And parameter, the homogenization heat treating step and parameter of 6 line aluminium alloys.

5 line aluminium alloy of the present invention homogenization heat treatment temperature be preferably 460~470 DEG C, can be 462~ 468 DEG C, or 464~466 DEG C.The time of the homogenization heat treatment of 5 line aluminium alloy is preferably 20~for 24 hours, it is more excellent It is selected as 21~for 24 hours, more preferably 22~for 24 hours.

6 line aluminium alloy of the present invention homogenization heat treatment temperature be preferably 540~550 DEG C, can be 542~ 548 DEG C, or 544~546 DEG C.The time of the homogenization heat treatment of 6 line aluminium alloy is preferably 20~for 24 hours, it is more excellent It is selected as 21~for 24 hours, more preferably 22~for 24 hours.

The step of present invention is to the hot rolling and parameter are not particularly limited, with this eka-aluminum well known to those skilled in the art The step of hot rolling of alloy and parameter, those skilled in the art can be according to practical condition, product requirement and quality It is required that selected and adjusted, the height of design and selection of the present invention for cooperation alloy compositions, further promotion alloy product Surface property, the hot rolling preferably include the hot-rolled step and parameter of 5 line aluminium alloys, the hot-rolled step and parameter of 6 line aluminium alloys. Particularly the temperature of hot rolling and deflection are optimized and controlled, the temperature for especially rolling beginning and end is controlled System.The total deformation of hot rolling of the present invention is preferably greater than to be equal to 70%, more preferably higher than equal to 80%, more preferably greatly In equal to 90%.

The start rolling temperature of the hot rolling of 5 line aluminium alloy of the present invention is preferably 410~430 DEG C, more preferably 415~425 DEG C, more preferably 420~425 DEG C.The finishing temperature of the hot rolling of 5 line aluminium alloy of the present invention is preferably 320~350 DEG C, more Preferably 325~345 DEG C, more preferably 330~340 DEG C.

The start rolling temperature of the hot rolling of 6 line aluminium alloy of the present invention is preferably 480~500 DEG C, more preferably 490~500 DEG C, more preferably 495~500 DEG C.The finishing temperature of the hot rolling of 6 line aluminium alloy of the present invention is preferably 320~350 DEG C, more Preferably 325~345 DEG C, more preferably 330~340 DEG C.

It is of the invention then to carry out cold rolling.The step of present invention is to the cold rolling and parameter are not particularly limited, with this field Known to technical staff the step of the cold rolling of such aluminium alloy and parameter, those skilled in the art can be according to actual productions Situation, product requirement and quality requirement are selected and are adjusted, and the temperature of cold rolling of the present invention is preferably room temperature.Institute of the present invention The total deformation for stating cold rolling is preferably 70~90%, more preferably 72~88%, more preferably 75~85%.

Design and selection of the present invention for cooperation alloy compositions further promote the high surface property of alloy product, special Not preferably cold rolling it is total during increase intermediate annealing step, i.e., specific steps are optimized for cold rolling, intermediate annealing and again Cold rolling.After thickness after the cold rolling of cold rolling of the present invention, i.e. first time cold rolling, the thickness before intermediate annealing is preferably 1.5 ~3.0mm, more preferably 1.7~2.7mm, more preferably 2.0~2.5mm.

The mode, step and parameter of the intermediate annealing is not particularly limited in the present invention, ripe with those skilled in the art The mode of the intermediate annealing of such aluminium alloy, step and the parameter known, those skilled in the art can be according to actual productions Situation, product requirement and quality requirement are selected and are adjusted, and the mode of intermediate annealing of the present invention is preferably protectiveness gas Annealing or air cushion furnace annealing under body.The temperature of intermediate annealing of the present invention is preferably 360~480 DEG C, more preferably 380~ 460 DEG C, more preferably 400~440 DEG C.The time annealed under protective gas of the present invention is preferably 3~8h, more preferably 4~7h, more preferably 5~6h.The time of the air cushion furnace annealing is preferably 5~10min, more preferably 6~9min, more preferably For 7~8min.

The parameter of the cold rolling again is not particularly limited in the present invention, is closed with this eka-aluminum well known to those skilled in the art The parameter of golden cold rolling, those skilled in the art can be selected according to practical condition, product requirement and quality requirement It selects and adjusts, the high surface property of design and selection of the present invention for cooperation alloy compositions, further promotion alloy product, institute The deformation allowance for stating cold rolling again is preferably 60~70%, more preferably 62~68%, more preferably 64~66%.It is described again The passage of secondary cold rolling is preferably 2~3 times, more preferably 2 times or 3 times.

The present invention, with reference to the high-low time tissue of alloy, recrystallizes degree and grain size after alloy cast ingot hot rolling cogging, Optimize the Annealing Scheme different with 6 systems with specific 5 system has been selected, with reference to parameters such as cold processing ratios, obtain best rolling And intermediate annealing process so that 5 be that alloy can directly obtain finished product, and 6 be to obtain finished product after alloy solid solution quenches, and ensure that conjunction Gold surface not only eliminates the strip flaw of sheet alloy, and prepared by mobile phone shell without stain black line and strip flaw After anodic oxidation in journey, Al-alloy casing has better apparent degree, meets the quality requirement on the high surface of user.

The present invention has obtained aluminum alloy plate materials after above-mentioned steps, to coordinate the design and selection of alloy compositions, into one Step promotes the high surface property of alloy product, optimization and complete production technology.Aluminum alloy plate materials of the present invention are that aluminium closes for 6 During golden plate material, after the cold rolling again, solution hardening and artificial aging are preferably further included.

The step of present invention in the solution hardening to being dissolved and parameter are not particularly limited, ripe with those skilled in the art The step of solid solution of such aluminium alloy known and parameter, those skilled in the art can be according to practical condition, products It is required that and quality requirement selected and adjusted, the mode of solution hardening of the present invention is preferably air cushion furnace solution hardening.Institute The temperature for stating solid solution is preferably 520~550 DEG C, more preferably 525~545 DEG C, more preferably 530~540 DEG C.It is of the present invention The soaking time of solid solution is preferably 8~10min, more preferably 8.3~9.7min, more preferably 8.5~9.5min.Institute of the present invention The type of cooling for stating quenching is preferably water quenching.

The step of present invention is to the artificial aging and parameter are not particularly limited, with it is well known to those skilled in the art this The step of artificial aging of class aluminium alloy and parameter, those skilled in the art can want according to practical condition, product It asks and quality requirement is selected and adjusted, the temperature of artificial aging of the present invention is preferably 155~165 DEG C, more preferably 157~163 DEG C, more preferably 159~161 DEG C.The time of artificial aging of the present invention is preferably 12~16h, more preferably 12.5~16h, more preferably 13~16h.

The present invention employs specific aging temp and soaking time again, while high surface is ensured, has qualification Mechanical property meets the high surface of mobile phone shell and high performance many-sided demand.The present invention formulates different-alloy ingredient by optimization Handset shell aluminum alloy materials squeeze, rolling processing, quenching, the preparation process such as aging technique, particularly optimize alloy material Melting and casting, hot rolling, cold rolling and the thermal treatment production process of material ensure that aluminium alloy Homogenization Treatments technique, cold rolling, centre are moved back Fire, aging technique are mutually matched, and are realized the product approval of alloy material, are realized rolled plate industrialized production, it is ensured that batch The big production alloy aluminium material amount of amount is stable, consistent, realizes the batch production of high surface high-performance handset shell aluminum alloy materials.

Above-mentioned steps of the present invention provide a kind of high surface Al-alloy casing of mobile phone and the preparation method of aluminium alloy sheet, The present invention starts with from the raw material aluminum alloy plate materials of mobile phone Al-alloy casing, with reference to the intensity requirement and Gao Biao of mobile phone Al-alloy casing The appearance requirement in face for the special selection that the classification of aluminium alloy carries out, then carries out each component of aluminium alloy creative Selection and combination, and be aided with specific proportional amount, selected 5252 aluminium alloys of 5 systems and 6061 aluminium alloys of 6 systems as Aluminum alloy plate materials.And any noble metal or rare element are not added in mobile phone Al-alloy casing provided by the invention, by right The inventive combination of process and selection with reference to specific technological parameter, are made rational, the feasible production greatly that can be used in and are set Standby special production and processing technology has especially optimized the founding, rolling processing and heat treatment process of high surface mobile phone aluminium, Guarantee produces greatly the stability and consistency of high surface alloy board quality, thus not only on the aluminum alloy plate materials on the basis of just Material line defect and black line defect are eliminated, will not occur drawbacks described above after follow-up anodic oxidation, greatly reduces mobile phone aluminium In alloy shell preparation process, resulting rejection rate；And process is simple, the popularization that is suitable for industrialized large-scaled production and should With with important practical significance and market prospects.

Experimental study and industrialized mass production show according to the molten of 5 systems and 6 line aluminium alloy handset shell materials The high surface aluminium alloy rolled sheet metal that the optimization processing technologies such as casting is made, rolls, quenching, timeliness are produced, the anodic oxygen after CNC The defects of change, aluminium alloy handset shell material structure is fine and close, no black line, piebald, material line and sand holes；And the punch forming of material Performance, cutting machining, corrosion resistance are satisfied by requirement.

In order to further illustrate the present invention, with reference to embodiments to a kind of rolling of aluminum alloy plate materials provided by the invention Technique and the preparation method of aluminum alloy plate materials are described in detail, but it is to be understood that these embodiments are with skill of the present invention Implemented under premised on art scheme, give detailed embodiment and specific operating process, only to further illustrate The features and advantages of the present invention rather than limiting to the claimed invention, protection scope of the present invention are also not necessarily limited to following Embodiment.

All raw and auxiliary materials are commercially available used in following embodiment.

Embodiment 1

5252 alloy compositions：Si is 0.032%, Fe 0.048%, and Cu 0.062%, Mn 0.01%, Mg are 2.47%, Ni 0.01%, Zn 0.01%, Ti 0.011%, single impurity≤0.05% add up to impurity≤0.15%, remaining It measures as Al.

Ingot casting specification is 520 × 1300mm；

Dispensing：Fe≤0.12% is controlled during the dispensing of stokehold；Stokehold is unworthy of Ti, ensures waste material and aluminium ingot using requirement during waste material In Ti content summation≤0.005%, final finished ingot casting Ti≤0.015%；Contact deslagging head, the stainless steel refining of aluminium water The tools such as device, stainless steel sample spoon, every time using preceding swabbing.

Melt refining purification：Using the refining of T-shape stainless steel purifier in standing furnace stove, melt refining temperature is 755 DEG C, Refinery gas uses high-purity argon gas, and each refining time 20 minutes, it is 30 minutes to refine interval time twice, time of repose 30 Minute.Online refining melt temperature is 725 DEG C, and online degasification uses Ar+Cl₂Mixed gas refines.

Melt filtration：Import 40PPI+ import 50PPI filter plate melts are used online.

Online refinement：Stokehold is unworthy of Ti, is not added with Al-5Ti-1B blocks.Al-3Ti-1B fining agents of addition online, additive amount For 1.8Kg/tAl.

Survey hydrogen：Control alloy melt hydrogen content≤0.15cm³/100gAl.Each heat carries out liquid and surveys hydrogen；Online liquid It is 0.104cm that state, which surveys hydrogen,³/100gAl。

Casting technique：Casting temperature is 732 DEG C；Casting speed is 55mm/min；Casting cooling water flow is 35m³/h。

Ingot homogenization：Ingot casting heating temperature is 540 DEG C, and soaking time is 24 hours, and the type of cooling is air-cooled to come out of the stove.

Ingot casting machines：After ingot casting excision head, tail, machining mills surface defect layer.

Hot rolling technology：420 DEG C of ingot casting heating temperature, cogging hot rolling after heat preservation 5 hours, hot finish to gauge thickness are 6.5mm, are controlled Finishing temperature is 350 DEG C.

Cold rolling and intermediate annealing：By hot rolling 6.5mm aluminium sheets in cold rolling at room temperature to 2.0mm, use is box under nitrogen protection Furnace annealing；Annealing heating temperature is 380 DEG C, and soaking time is 3 hours, and the type of cooling is air-cooled to come out of the stove.Treat that aluminium volume is cooled to room Finished product, aluminium plate thickness 0.8mm are cold-rolled to after temperature again.

High surface aluminium sheet prepared by the embodiment of the present invention 1 carries out anodic oxidation.

Referring to Fig. 1, appearance photos of the Fig. 1 for 5252 aluminum alloy plate materials after 1 Anodic Oxidation of the embodiment of the present invention.

High surface aluminium sheet prepared by the embodiment of the present invention 1 is made with reference to phone housing manufacture craft, through CNC punching presses, machine Processing obtains mobile phone Al-alloy casing with after anodic oxidation.

Referring to Fig. 2, Fig. 2 is the appearance photo of 5252 aluminium alloy handset shells prepared by the embodiment of the present invention 1.

By Fig. 1 and Fig. 2 it is found that the plank of anodic oxidation and the material structure of handset shell are fine and close after CNC, no black line, The defects of piebald, material line and sand holes.

And aluminum alloy materials punch forming performance, cutting machining, corrosion resistance be satisfied by requirement.

Embodiment 2

5252 alloy compositions：Si is 0.002%, Fe 0.025%, and Cu 0.06%, Mn 0.01%, Mg are 2.34%, Ni 0.01%, Zn 0.01%, Ti 0.008%, single impurity≤0.05% add up to impurity≤0.15%, remaining It measures as Al.

Ingot casting specification is 520 × 1300mm；

Dispensing：Fe≤0.12% is controlled during the dispensing of stokehold；Stokehold is unworthy of Ti, ensures waste material and aluminium ingot using requirement during waste material In Ti content summation≤0.005%, final finished ingot casting Ti≤0.015%；Contact deslagging head, the stainless steel refining of aluminium water The tools such as device, stainless steel sample spoon, every time using preceding swabbing.

Melt refining purification：Using the refining of T-shape stainless steel purifier in standing furnace stove, melt refining temperature is 745 DEG C, Refinery gas uses high-purity argon gas, and each refining time 25 minutes, it is 38 minutes to refine interval time twice, time of repose 30 Minute.Online refining melt temperature is 735 DEG C, and online degasification uses Ar+Cl₂Mixed gas refines.

Melt filtration：Import 40PPI+ import 50PPI filter plate melts are used online.

Online refinement：Stokehold is unworthy of Ti, is not added with Al-5Ti-1B blocks.Al-5Ti-0.2B fining agents of addition online, addition It measures as 1.2Kg/tAl.

Survey hydrogen：Control alloy melt hydrogen content≤0.15cm³/100gAl.Each heat carries out liquid and surveys hydrogen；Online liquid It is 0.112cm that state, which surveys hydrogen,³/100gAl。

Casting technique：Casting temperature is 736 DEG C；Casting speed is 56mm/min；Casting cooling water flow is 36m³/h。

Ingot homogenization：Ingot casting heating temperature is 545 DEG C, and soaking time is 24 hours, and the type of cooling is air-cooled to come out of the stove.

Ingot casting machines：After ingot casting excision head, tail, machining mills surface defect layer.

Hot rolling technology：425 DEG C of ingot casting heating temperature, cogging hot rolling after heat preservation 5 hours, hot finish to gauge thickness are 7.0mm, are controlled Finishing temperature is 350 DEG C.

Cold rolling and intermediate annealing：By hot rolling 7.0mm aluminium sheets in cold rolling at room temperature to 3.5mm, using air cushion furnace online annealing；It moves back Fiery heating temperature is 450 DEG C, soaking time 7min, and the type of cooling is online high wind water cooling.After aluminium volume is cooled to room temperature again It is secondary to be cold-rolled to finished product, aluminium plate thickness 1.2mm.

High surface aluminium sheet prepared by the embodiment of the present invention 2 carries out anodic oxidation.

High surface aluminium sheet prepared by the embodiment of the present invention 2 is made with reference to phone housing manufacture craft, through CNC punching presses, machine Processing obtains mobile phone Al-alloy casing with after anodic oxidation.

The result shows that the plank of anodic oxidation and the material structure of handset shell are fine and close after CNC, no black line, piebald, material The defects of expecting line and sand holes.

And aluminum alloy materials punch forming performance, cutting machining, corrosion resistance be satisfied by requirement.

Embodiment 3

6061 alloy compositions：Si is 0.61%, Fe 0.07%, and Cu 0.18%, Mn 0.01%, Mg are 1.08%, Cr 0.20%, Ni 0.01%, Zn 0.01%, Ti 0.010%, single impurity≤0.05% add up to impurity ≤ 0.15%, surplus Al.

Ingot casting specification is 510 × 1360mm；

Dispensing：Fe≤0.12% is controlled during the dispensing of stokehold；Stokehold is unworthy of Ti, ensures waste material and aluminium ingot using requirement during waste material In Ti content summation≤0.005%, final finished ingot casting Ti≤0.015%；Contact deslagging head, the stainless steel refining of aluminium water The tools such as device, stainless steel sample spoon, every time using preceding swabbing.

Melt refining purification：Using the refining of T-shape stainless steel purifier in standing furnace stove, melt refining temperature is 750 DEG C, Refinery gas uses high-purity argon gas, and each refining time is 28 minutes, and it is 35 minutes to refine interval time twice, and time of repose is 30 minutes.Online refining melt temperature is 728 DEG C, and online degasification uses Ar+Cl₂Mixed gas refines.

Melt filtration：Import 40PPI+ import 50PPI filter plate melts are used online.

Online refinement：Stokehold is unworthy of Ti, is not added with Al-5Ti-1B blocks.Al-3Ti-1B fining agents of addition online, additive amount For 1.5Kg/tAl.

Survey hydrogen：Control alloy melt hydrogen content≤0.15cm³/100gAl.Each heat carries out liquid and surveys hydrogen；Online liquid It is 0.103cm that state, which surveys hydrogen,³/100gAl。

Casting technique：Casting temperature is 728 DEG C；Casting speed is 48mm/min；Casting cooling water flow is 32m³/h。

Ingot homogenization：Ingot casting heating temperature is 540 DEG C, and soaking time is 24 hours, and the type of cooling is air-cooled to come out of the stove.

Ingot casting machines：After ingot casting excision head, tail, machining mills surface defect layer.

Hot rolling technology：500 DEG C of ingot casting heating temperature, cogging hot rolling after heat preservation 6 hours, hot finish to gauge thickness are 6.0mm, are controlled Finishing temperature is 350 DEG C.

Cold rolling and intermediate annealing：By hot rolling 6.0mm aluminium sheets in cold rolling at room temperature to 2.5mm, using air cushion furnace online annealing；It moves back Fiery heating temperature is 480 DEG C, soaking time 8min, and the type of cooling is online high wind water cooling.After aluminium volume is cooled to room temperature again It is secondary to be cold-rolled to finished product, aluminium plate thickness 1.0mm.

Solution hardening：It is dissolved using air cushion furnace press quenching, heating temperature is 545 DEG C, soaking time 8min, cooling side Formula is online water cooling.

Artificial aging：Using box timeliness air furnace timeliness.Heating temperature is 165 DEG C, and soaking time is 16 hours, cooling Mode is air-cooled to come out of the stove.

High surface aluminium sheet prepared by the embodiment of the present invention 3 carries out anodic oxidation.

Referring to Fig. 3, appearance photos of the Fig. 3 for 6061 aluminum alloy plate materials after 3 Anodic Oxidation of the embodiment of the present invention.

High surface aluminium sheet prepared by the embodiment of the present invention 3 is made with reference to phone housing manufacture craft, through CNC punching presses, machine Processing obtains mobile phone Al-alloy casing with after anodic oxidation.

Referring to Fig. 4, Fig. 4 is the appearance photo of 6061 aluminium alloy handset shells prepared by the embodiment of the present invention 3.

By Fig. 3 and Fig. 4 it is found that the material structure of plank and handset shell is fine and close, no black line, piebald, material line and sand The defects of eye.

And aluminum alloy materials punch forming performance, cutting machining, corrosion resistance be satisfied by requirement.

Above to a kind of rolling mill practice of high surface aluminium alloy sheet for mobile phone Al-alloy casing provided by the invention And the preparation method of aluminium alloy sheet is described in detail, specific case used herein is to the principle of the present invention and reality The mode of applying is expounded, and the explanation of above example is only intended to facilitating the understanding of the method and its core concept of the invention, is wrapped Best mode is included, and but also any person skilled in the art can put into practice the present invention, including manufacturing and using any Device or system and the method for implementing any combination.It should be pointed out that for those skilled in the art, Without departing from the principles of the invention, can also to the present invention some improvement and modification can also be carried out, these improvement and modification are also fallen Enter in the protection domain of the claims in the present invention.The range of patent protection of the present invention is defined by the claims, and may include Those skilled in the art it is conceivable that other embodiment.If these other embodiments, which have, is not different from claim text The structural element or if they include wanting with equivalent structure of the character express without essence difference of claim that word is stated Element, then these other embodiments should also be included in the scope of the claims.

Claims (10)

1. a kind of rolling mill practice of aluminum alloy plate materials, which is characterized in that include the following steps：

By aluminium alloy cast ingot by homogenization heat treatment, hot rolling, cold rolling, intermediate annealing and again after cold rolling, aluminium alloy plate is obtained Material；

The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

2. rolling mill practice according to claim 1, which is characterized in that the temperature of the homogenization heat treatment of 5 line aluminium alloy Spend is 460~470 DEG C；

The temperature of the homogenization heat treatment of 6 line aluminium alloy is 540~550 DEG C；

The time of the homogenization heat treatment for 20~for 24 hours.

3. rolling mill practice according to claim 1, which is characterized in that the start rolling temperature of the hot rolling of 5 line aluminium alloy is 410~430 DEG C；

The start rolling temperature of the hot rolling of 6 line aluminium alloy is 480~500 DEG C；

The finishing temperature of the hot rolling is 320~350 DEG C；

The total deformation of the hot rolling is more than or equal to 70%.

4. rolling mill practice according to claim 1, which is characterized in that the total deformation of the cold rolling is 70~90%；

Thickness after the cold rolling is 1.5~3.0mm；

The deformation allowance of the cold rolling again is 60~70%；

The passage of the cold rolling again is 2~3 times.

5. rolling mill practice according to claim 1, which is characterized in that the intermediate annealing be protective gas under annealing or Air cushion furnace annealing；

The temperature of the intermediate annealing is 360~480 DEG C；

The time annealed under the protective gas is 3~8h；

The time of the air cushion furnace annealing is 5~10min.

6. rolling mill practice according to claim 1, which is characterized in that when the aluminum alloy plate materials are 6 line aluminium alloy plank, After the cold rolling again, solution hardening and artificial aging are further included；

The temperature of the solid solution is 520~550 DEG C；

The soaking time of the solid solution is 8~10min；

The temperature of the artificial aging is 155~165 DEG C；

The time of the artificial aging is 12~16h.

7. rolling mill practice according to claim 6, which is characterized in that 5 line aluminium alloy includes 5252 aluminium alloys；

6 line aluminium alloy includes 6061 aluminium alloys；

The aluminum alloy plate materials are aluminium alloy sheet；

The thickness of the aluminum alloy plate materials is 0.5~1.8mm；

The state of the 5 line aluminium alloy plank is H14 states；

The state of the 6 line aluminium alloy plank is T6 states.

8. a kind of preparation method of aluminum alloy plate materials, which is characterized in that include the following steps：

1) aluminium alloy stock after dispensing is subjected to melting and casting, obtains aluminium alloy cast ingot；

2) aluminium alloy cast ingot that above-mentioned steps obtain is obtained after the rolling mill practice described in claim 1~7 any one Aluminum alloy plate materials；

The aluminium alloy includes 5 line aluminium alloys and/or 6 line aluminium alloys.

9. preparation method according to claim 8, which is characterized in that the temperature of the melting is 720~760 DEG C；

The time of the melting is 5~10h；

It is described to be cast into semi-continuous casting；

The temperature of the casting of 5 line aluminium alloy is 720~750 DEG C；

The speed of the casting is 45~60mm/min；

The cooling water flow of the casting is 25~45m³/h；

The temperature of the casting of 6 line aluminium alloy is 720~750 DEG C；

The speed of the casting is 45~50mm/min；

The cooling water flow of the casting is 20~40m³/h。

10. preparation method according to claim 8, which is characterized in that the step 1) is specially：

11) by aluminium alloy stock after dispensing, shove charge fusing obtains raw material melt；

12) after the raw material melt that above-mentioned steps obtain being carried out standing refining, the fining agent containing Ti is added in, using online degasification After on-line filtration, alloy melt is obtained；It is described stand refining the specific steps are refined, stood and smart again successively Refining；

13) alloy melt for obtaining above-mentioned steps obtains aluminium alloy cast ingot after casting.