CN101959625A - Aluminum alloy plate and process for producing the same - Google Patents

Aluminum alloy plate and process for producing the same Download PDF

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Publication number
CN101959625A
CN101959625A CN200980106340XA CN200980106340A CN101959625A CN 101959625 A CN101959625 A CN 101959625A CN 200980106340X A CN200980106340X A CN 200980106340XA CN 200980106340 A CN200980106340 A CN 200980106340A CN 101959625 A CN101959625 A CN 101959625A
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China
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quality
aluminium alloy
plate
alloy
thickness
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CN200980106340XA
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Chinese (zh)
Inventor
小林一德
加藤友晴
稻叶隆
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株式会社神户制钢所
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Priority to JP2008-085283 priority Critical
Priority to JP2008085283 priority
Application filed by 株式会社神户制钢所 filed Critical 株式会社神户制钢所
Priority to PCT/JP2009/056089 priority patent/WO2009119724A1/en
Publication of CN101959625A publication Critical patent/CN101959625A/en

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00Obtaining aluminium
    • C22B21/06Obtaining aluminium refining
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00Obtaining aluminium
    • C22B21/06Obtaining aluminium refining
    • C22B21/066Treatment of circulating aluminium, e.g. by filtration
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/10Alloys based on aluminium with zinc as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B3/00Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001Aluminium or its alloys

Abstract

An aluminum alloy plate is provided which is suitable for use as members for apparatuses relating to semiconductors. The alloy plate is satisfactory in plate thickness precision and flatness and can be inhibited from having surface defects. Also provided is a process for producing the plate. An aluminum alloy comprising given components is melted (melting step), and hydrogen gas and inclusions are removed therefrom (dehydrogenation step and filtration step). This melt is cast into an ingot (casting step). According to need, the ingot is homogenized by a heat treatment (soaking step). This ingot is hot-rolled to a given thickness (hot-rolling step), cut (cutting step), and finished by smoothening the surfaces (smoothening step). According to need, the plate may be subjected to straightening (straightening step) and a heat treatment, e.g., annealing (annealing step). The aluminum alloy plate obtained has a surface flatness of 0.2 mm or less per m of rolling-direction length and has fluctuations in plate thickness within +-0.5% of a desired plate thickness.

Description

Aluminium alloy thick plate and manufacture method thereof

Technical field

The present invention relates to a kind of aluminium alloy thick plate and manufacture method thereof.

Background technology

Usually, aluminum alloy materials is except being used for underlay substrate, conveying device, vacuum plant with the semiconductor relevant apparatus such as chamber, just uses in various uses such as motor electronic part and manufacturing installation thereof, daily necessities, machine components.In addition, as being used for the mould raw material of punching press, use iron and steel, cast steel etc. in the batch process, and, use Zinc alloy casting material, aluminium alloy castings material etc. as trial-production usefulness with mould.In addition, in recent years, from the tendency of many a small amount ofization of kind, as middle produced in small quantities usefulness, exhibitions such as the rolling stock of aluminium alloy or forged material are stretched material and are popularized.

This wherein, rolling stock for aluminium alloy, for example as shown in Figure 2, after making via annealing operation S600 from fusion operation S101, to distortion, thickness of slab and surface blemish etc. (are for example checked, with reference to TOHKEMY 2006-281381 communique), implement to utilize processing that the resin molding of vinyl chloride system or polyethylene system etc. covers the pass schedule back side (for example afterwards, that knows has the skill newspaper/Vol.52No.2 of Kobe Steel, a Sep.2002, registration mark: the registration mark of ア Le Ha イ ス (ALHIGHCE) Furukawa sky society (Furukawa-Sky Aluminum Corp.) system: Ha イ プ レ one ト (HIPLATE) etc.) (S101~S900).

Why be made as the product form that covers pass schedule, the back side with resin molding, be because since the high-accuracy aluminum alloy slab use as the part of precision equipment etc. mostly, so conclude the business via cutting plate whole seller (cut length sheet wholesaler) according to small size, little quota.That is,, in precision equipment part purposes, implement to break for the undersized sawing that forms pad (サ イ コ ロ) size for the cutting plate whole seller, in the vacuum chamber purposes, the processing of local enforcement end mill, therefore, non-processing part becomes the device exterior material.Therefore, produce flaw when preventing these machining, the product form circulation that covers with resin molding with the pass schedule back side of high-accuracy aluminum alloy slab.

The rolling stock of this aluminium alloy is usually by making ingot rolling to specific thickness.But such aluminum alloy hot rolling plate is owing to only by roll control thickness of slab and flatness, be difficult to obtain good thickness of slab precision and flatness (the especially flatness of rolling direction).In addition, form thick oxide scale film during hot rolling on the rolling surface, therefore, the control of same flat degree is difficulty.So, also disclose implement below 5% at the reduction ratio of the degree of not putting aside distortion after the hot rolling cold rolling, the technology (for example with reference to patent documentation 1) that the precision of thickness of slab is improved.

Patent documentation 1:(Japan) spy opens 2006-316332 communique (paragraph 0027~0028)

But the prior art of above-mentioned patent documentation 1 is made thin plate about thickness of slab 1mm with aluminum alloy materials.

In addition, described surface blemish not only influences the appearance looks elegant of product, also is the great quality defect that damages product function, when the finished product rate is descended, in order to remove this defective, also needs a lot of the number of working processes, becomes the main cause that hinders productivity.For example, there are the following problems, uses among the undersized client of pad size, to after buying product and processing and deliver goods, find flaw owing to before product delivery, peel off the stage of coated with resin mould, and finally lose sales opportunnities to client, perhaps in the vacuum chamber purposes, under the situation of fine flaw for the casting honeycomb, can become functional defect, when flaw is fine, can not distinguish with the damage flaw, the reason of judging flaw needs thus, to lose the sales opportunnities to client for a long time.

In addition, become the flaw level of problem, require level to increase in recent years, the degree of depth is the flaw of the size more than the 8 μ m, about the about 0.1mm of diameter of equivalent circle, and range estimation just can be found, therefore becomes the place of problem.In addition, in the existing manufacture method, be difficult to eliminate fully the flaw of described level.In addition, mainly be in the vacuum chamber purposes, almost material surface is not handled and directly used, in order to improve corrosion resistance, weatherability, implement pellumina and handle or electroplating processes.In recent years, even there is not defective on the raw sheet, after implementing described surface treatment, because there is the trouble that produces the blemish of the black line shape about about 3 μ m length on the rolling parallel direction in the fusion remnants of Ti-B described later, its improvement becomes the task of top priority.According to the requirement of client for these blemish, preferably before lining reliably with the blemish of this level, the perhaps high-accuracy aluminum alloy slab got rid of of the blemish that produces by surface treatment.

The present invention puts in view of the above problems and finishes, its purpose is to provide aluminium alloy thick plate and manufacture method thereof, it has can manufacture good thickness of slab precision and the flatness of vacuum plant with the such semiconductor relevant apparatus in chamber etc., can suppress the blemish that flaw or black line etc. cause simultaneously.

Summary of the invention

In order to address the above problem, aluminium alloy thick plate of the present invention is that the surface smoothingization with the aluminum alloy hot rolling plate forms, and its surperficial flatness is below the 0.2mm in every 1m length on the rolling direction, the deviation of thickness of slab be desired thickness of slab ± 0.5% in.

Like this, by (before the resin mold lining) surface smoothingization, the flatness on surface and the deviation of thickness of slab are limited in the prescribed limit, thus, do not implementing under the cold rolling situation that waits thin-walled property processing, can make the aluminum alloy materials that is used for requiring in shape high-precision product of semiconductor relevant apparatus etc.In addition, can suppress the blemish that flaw and black line etc. cause.

Preferably, described aluminium alloy thick plate contains Mg:1.5~12.0 quality %, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:0.6 quality % is following, Mn:1.0 quality % is following, Cr:0.5 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, surplus is made of Al and unavoidable impurities.

Contain above-mentioned element by the concentration with prescribed limit, the Al-Mg that can make except that thickness of slab precision and flatness, characteristic such as intensity is also excellent is an alloy plate.In addition, the blemish that flaw and black line etc. cause can be suppressed, and the generation of the color spot (color irregularity) on surface can be suppressed.

Preferably, described aluminium alloy thick plate is made of aluminium alloy, this aluminium alloy contains Mn:0.3~1.6 quality %, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:0.5 quality % is following, Mg:1.5 quality % is following, Cr:0.3 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, surplus is made of Al and unavoidable impurities.

Contain above-mentioned element by the concentration with prescribed limit, the Al-Mn that can make except that thickness of slab precision and flatness, characteristic such as intensity is also excellent is an alloy plate.In addition, the blemish that flaw and black line etc. cause can be suppressed, and the generation of the color spot on surface can be suppressed.

Preferably, described aluminium alloy thick plate is made of aluminium alloy, this aluminium alloy contains Mg:0.3~1.5 quality %, Si:0.2~1.6 quality %, contain also that Fe:0.8 quality % is following, Cu:1.0 quality % following, Mn:0.6 quality % is following, Cr:0.5 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, surplus is made of Al and unavoidable impurities.

Contain above-mentioned element by the concentration with prescribed limit, the Al-Mg-Si that can make except that thickness of slab precision and flatness, characteristic such as intensity is also excellent is an alloy plate.In addition, the blemish that flaw and black line etc. cause can be suppressed, and the generation of the color spot on surface can be suppressed.

Preferably, described aluminium alloy thick plate is made of aluminium alloy, this aluminium alloy contains Zn:3.0~9.0 quality %, Mg:0.4~4.0 quality %, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:3.0 quality % is following, Mn:0.8 quality % is following, Cr:0.5 quality % is following, Ti:0.1 quality % is following, Zr:0.25 quality % more than one in following, surplus is made of Al and unavoidable impurities.

Contain above-mentioned element by the concentration with prescribed limit, the Al-Zn-Mg that can make except that thickness of slab precision and flatness, characteristic such as intensity is also excellent is an alloy plate.In addition, the blemish that flaw and black line etc. cause can be suppressed, and the generation of the color spot on surface can be suppressed.

In addition, the manufacture method of aluminium alloy thick plate of the present invention, it carries out following operation: the fusion operation of aluminium alloy being fused into aluminium alloy solution for making the method for aforesaid aluminium alloy thick plate; Remove the dehydrogenation operation of hydrogen from described aluminium alloy solution; Remove the filtration operation of field trash from the aluminium alloy solution of having removed described hydrogen; The aluminium alloy solution of having removed described field trash is cast and made the casting process of ingot casting; Described ingot casting is rolled into specific thickness and makes the hot-rolled process of hot rolled plate; Described hot rolled plate is cut into the rolling direction length of regulation and the cut-out operation of width; Smoothing treatment process with the surface smoothingization of the hot rolled plate after the described cut-out; In described smoothing treatment process, the thickness of removing on the surface of described hot rolled plate is 2~5mm at each face.

Like this, implement the smoothing processing with the thickness of removing of regulation, can improve thickness of slab precision and flatness by surface at hot rolled plate.In addition, can suppress the blemish that flaw and black line etc. cause.

Preferably, the manufacture method of described aluminium alloy thick plate before described hot-rolled process, is carried out described ingot casting with more than 400 ℃ and the heat treated equal heat treatment step of the temperature maintenance of the fusing point of not enough described aluminium alloy more than 1 hour.

Like this, by before hot rolling, ingot casting being heat-treated, can make the ingot casting miniaturization, homogenize.

Preferably, in the manufacture method of described aluminium alloy thick plate, before described smoothing treatment process, carry out annealing operation with the annealing of the hot rolled plate after the described cut-out.

Like this, by hot rolled plate is implemented annealing, can improve the characteristic of hot rolled plate.

Preferably, the manufacture method of described aluminium alloy thick plate, described smoothing treatment process are carried out by cutting method, more than grinding in the method for cutting and the polishing any.

By such method, the thickness of slab precision and the flatness of aluminium alloy thick plate are good.In addition, can suppress the blemish that flaw and black line etc. cause.

According to aluminium alloy thick plate of the present invention, even in the few slab of plastic deformation, also can become desirable thickness of slab and smooth slab, therefore, be applicable to the situation that manufactures semiconductor relevant apparatus of requiring correct shape etc.In addition, can suppress the blemish that flaw and black line etc. cause, therefore, the surface texture of slab is good.In addition, by using the aluminium alloy of regulation, characteristics such as intensity improve, and in addition, can suppress the generation of surperficial color spot, make the surface configuration of slab better.

According to the manufacture method of aluminium alloy thick plate of the present invention, the aluminium alloy thick plate that can have above-mentioned effect with better productivity manufacturing.

Description of drawings

Fig. 1 is the flow chart of the manufacture method of expression aluminium alloy thick plate of the present invention;

Fig. 2 is the flow chart of an example of manufacture method of the aluminium alloy thick plate of expression prior art.

The specific embodiment

Below, realize that to being used to the optimum way of aluminium alloy thick plate of the present invention describes.

[formation of aluminium alloy thick plate]

Aluminium alloy thick plate of the present invention be with the surface smoothing change aluminum alloy hot rolling plate (aluminum alloy hot rolling plate), the surface flatness be below the 0.2mm in every 1m length on the rolling direction, the deviation of thickness of slab be desired thickness of slab ± 0.5% in.In addition, aluminium alloy thick plate of the present invention is that thickness of slab is the sheet material of 15~200nm, but is not limited thereto, and can suitably change according to the purposes of aluminium alloy thick plate.Below, each key element that constitutes aluminium alloy thick plate of the present invention is described.

(flatness on surface: the every 1m length of rolling direction is that 0.2mm is following)

When the vacuum plant of the parts of semiconductor relevant apparatus, especially plasma treatment appts etc. and so on was used the parts that use the flatness difference in the internal part of chamber, when being decompressed to high vacuum, because adsorbed gas is emitted from parts surface, vacuum descended.Therefore, the vacuum that reaches target needs the time, and production efficiency reduces.Therefore, the flatness on the surface of aluminium alloy thick plate of the present invention is below the 0.2mm/m.In addition, the flatness on the surface of hot rolled plate is the poorest in rolling direction, and therefore, being made as the every 1m length of rolling direction is below the 0.2mm.Such flatness is regulated by the smoothing treatment process and the correction process of manufacture method described later.

(deviation of thickness of slab: desired thickness of slab ± 0.5% in)

Aluminium alloy thick plate of the present invention because be the parts etc. that manufacture the semiconductor relevant apparatus, require high-precision product in shape, therefore, also require high accuracy for thickness of slab.In order to adapt to this requirement, the deviation of thickness of slab desired thickness of slab ± 0.5% in.Such thickness of slab precision is regulated by the smoothing treatment process of manufacture method described later.

In addition, the amounts of hydrogen that comprises among preferred its every 100g of aluminium alloy thick plate of the present invention is below the 0.2ml, more preferably below the 0.1ml.Hydrogen from fuel hydrogen or be attached to the moisture on metal etc., other generations such as organic matter.When containing too much hydrogen, cause producing pin hole, perhaps the intensity of product weakens.In addition, hydrogen gathers at the crystal boundary of the near surface of ingot casting, denseization, expansion (blister), and the expansion (blister) of the aluminium alloy thick plate that caused by expansion of ingot casting take place, and produce the latent defect on the slab surface that manifests as the blemish of slab.In addition, vacuum plant is when existing these defectives on the internal part of chamber, and when being decompressed to high vacuum, owing to be solid-solubilized in gas atom in the parts to the emitting of surface, vacuum descends.Therefore, the vacuum that reaches target needs the time, and production efficiency reduces.In order to reduce the amounts of hydrogen that comprises in the aluminium alloy thick plate, by the dehydrogenation operation in the manufacture method described later, the aluminium alloy solution before casting is removed hydrogen.

Concentration for the hydrogen of ingot casting, for example can be from cutting out sample and utilize pure and mild acetone to carry out the ingot casting of ultrasonic washing from ingot casting (all before the heat treatment), (LIS (Light-metal Industrial Standard) AO6-1993) obtains by inert gas flow heat of fusion conductance method.In addition, for the concentration of the hydrogen of aluminium alloy thick plate, for example can remove the oxide scale film on surface with nitric acid after cut out sample from aluminium alloy thick plate and be dipped to NaOH, and carry out the ingot casting of ultrasonic washing with pure and mild acetone, (LIS AO6-1993) obtains by the heating in vacuum extraction titration.

Aluminium alloy thick plate of the present invention can be made of any aluminium alloy, can be that alloy, Al-Mn are that alloy, Al-Mg-Si are that alloy, Al-Zn-Mg are any of alloy from Al-Mg, selects to be fit to the material of its purposes.Below, each key element of one of aluminium alloy of constituting aluminium alloy thick plate of the present invention example is described.

[Al-Mg is an alloy]

Al-Mg of the present invention is alloy, promptly is that the aluminium alloy of Al alloy contains Mg:1.5~12.0 quality % based on 5000, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:0.6 quality % is following, Mn:1.0 quality % is following, Cr:0.5 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, surplus is made of Al and unavoidable impurities.

(Mg:1.5~12.0 quality %)

It is the effect of the intensity of alloy that Mg has the Al-Mg of raising.Mg contains quantity not sufficient 1.5 quality %, and then this effect is little, and on the other hand, when Mg content surpassed 12.0 quality %, castability significantly descended and can not manufacture a product.Therefore, state in the use under the situation that the Al-Mg that becomes to be grouped into is an alloy, Mg content need be made as 12.0 quality %.Therefore, Mg content is made as 1.5~12.0 quality %.

(Si:0.7 quality % is following)

Si is contained in element in the aluminium alloy inevitably as metal impurity.Si has the effect of the intensity that improves aluminium alloy, but then, combines generation Al-(Fe)-(Mn)-Si series intermetallic compound with Mn, Fe.When Si content surpasses 0.7 quality %, in ingot casting, produce thick intermetallic compound, easily produce color spot on the appearance after pellumina is handled.Therefore, Si content is made as below the 0.7 quality %.

(Fe:0.8 quality % is following)

Fe is contained in element in the aluminium alloy inevitably as metal impurity.The effect that Fe has crystal grain miniaturization, the stabilisation that makes aluminium alloy and intensity is improved.On the other hand, when casting etc., combine generation Al-Fe-(Mn)-Si series intermetallic compound with Mn, Si.When Fe content surpasses 0.8 quality %, in ingot casting, produce thick intermetallic compound, easily produce color spot on the appearance after pellumina is handled.Therefore, Fe content is made as below the 0.8 quality %.

(Cu:0.6 quality % is following)

Cu has solid solution improves intensity in aluminium alloy effect.When Cu content was 0.6 quality %, can fully guarantee to be used for as Al-Mg was the intensity that alloy plate uses, and when surpassing this content, even add, effect is saturated.Therefore, Cu content is made as below the 0.6 quality %.

(Mn:1.0 quality % is following)

Mn has solid solution improves intensity in aluminium alloy effect.On the other hand, when Mn content surpasses 1.0 quality %, in ingot casting, produce thick intermetallic compound, easily produce color spot on the appearance after pellumina is handled.Therefore, Mn content is made as below the 1.0 quality %.

(Cr:0.5 quality % is following)

Cr separates out as fine compound when when casting or heat treatment, has to suppress the effect that crystal grain is grown up.On the other hand, when Cr content surpasses 0.5 quality %, produce thick Al-Cr series intermetallic compound, easily produce color spot on the appearance after pellumina is handled as primary crystal.Therefore, Cr content is made as below the 0.5 quality %.

(Zn:0.4 quality % is following)

Zn has the effect of the intensity that improves aluminium alloy.When Zn content was 0.4 quality %, can fully guarantee to be used for as Al-Mg was the intensity that alloy plate uses, and when surpassing, even add, effect is saturated.Therefore, Zn content is made as below the 0.4 quality %.

(Ti:0.1 quality % is following)

Ti has the effect of the crystal grain that makes aluminium alloy.Even Ti content surpasses 0.1 quality %, its effect is saturated.Therefore, Ti content is made as below the 0.1 quality %.

[Al-Mn is the composition of alloy]

Then, be that each key element of alloy describes to Al-Mn.Al-Mn of the present invention is alloy, promptly is that the aluminium alloy of Al alloy contains Mn:0.3~1.6 quality % based on 3000, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:0.5 quality % is following, Mg:1.5 quality % is following, Cr:0.3 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, surplus is made of Al and unavoidable impurities.

(Mn:0.3~1.6 quality %)

Mn has solid solution improves intensity in aluminium alloy effect.Mn contains quantity not sufficient 0.3 quality %, and then this effect is little, on the other hand, when Mn content surpasses 1.6 quality %, produces thick Al-(Fe)-Mn-(Si) series intermetallic compound in ingot casting, easily produces color spot on the appearance after pellumina is handled.Therefore, Mn content is 0.3~1.6 quality %.

(Mg:1.5 quality % is following)

Mg has the effect of the intensity that improves aluminium alloy.When Mg content was 1.5 quality %, can fully guarantee to be used for as Al-Mn was the intensity that alloy plate uses, and when surpassing, even add, effect is saturated.Therefore, Mg content is made as below the 1.5 quality %.

(below the Si:0.7 quality %, below the Fe:0.8 quality %, below the Cu:0.5 quality %, below the Cr:0.3 quality %, below the Zn:0.4 quality %, below the Ti:0.1 quality %)

Si, Fe, Cu, Cr, Zn, Ti effect separately and Al-Mg are that the effect in the alloy is identical, therefore omit.

[Al-Mg-Si is the composition of alloy]

Then, be that each key element of alloy describes to Al-Mg-Si.Al-Mg-Si of the present invention is that alloy is that the aluminium alloy of Al alloy contains Mg:0.3~1.5 quality %, Si:0.2~1.6 quality % based on 6000 promptly, contain also that Fe:0.8 quality % is following, Cu:1.0 quality % following, Mn:0.6 quality % is following, Cr:0.5 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, surplus is made of Al and unavoidable impurities.

(Mg:0.3~1.5 quality %)

Mg has the effect of the intensity that improves aluminium alloy, in addition, by with the Si coexistence, form Mg2Si and improve the intensity of aluminium alloy.Mg contains quantity not sufficient 0.3 quality %, and then these effects are little, on the other hand, when Mg content surpasses 1.5 quality %, becomes the characteristic of Al-Mg system (5000 is Al) alloy sometimes.Therefore, Mg content is made as 0.3~1.5 quality %.

(Si:0.2~1.6 quality %)

Si has the effect of the intensity that improves aluminium alloy, in addition, by with the Mg coexistence, form Mg2Si and improve the intensity of aluminium alloy.Si contains quantity not sufficient 0.2 quality %, and then these effects are little, on the other hand, when Si content surpasses 1.6 quality %, is the thick intermetallic compound of generation in the alloy at Al-Mg-Si, easily produces color spot on the appearance after pellumina is handled.Therefore, Si content is 0.2~1.6 quality %.

(Cu:1.0 quality % is following)

Cu has solid solution improves intensity in aluminium alloy effect, and on the other hand, when Cu content surpassed 1.0 quality %, Al-Mg-Si was that the corrosion resistance of alloy reduces.Therefore, Cu content is made as below the 1.0 quality %.

(Zn:0.4 quality % is following)

Zn has the effect of the intensity that improves aluminium alloy, and on the other hand, when Zn content surpassed 0.4 quality %, Al-Mg-Si was that the corrosion resistance of alloy reduces.Therefore, Zn content is made as 0.4 quality %.

(below the Fe:0.8 quality %, below the Mn:0.6 quality %, below the Cr:0.5 quality %, below the Ti:0.1 quality %)

Fe, Mn, Cr, Ti effect separately and Al-Mg are that the effect in the alloy is identical, therefore omit.

[Al-Zn-Mg is the composition of alloy]

Then, be that each key element of alloy describes to Al-Zn-Mg.Al-Zn-Mg of the present invention is alloy, promptly is that the aluminium alloy of Al alloy contains Zn:3.0~9.0 quality %, Mg:0.4~4.0 quality % based on 7000, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:3.0 quality % is following, Mn:0.8 quality % is following, Cr:0.5 quality % is following, Ti:0.1 quality % is following, Zr:0.25 quality % more than one in following, surplus is made of Al and unavoidable impurities.

(Zn:3.0~9.0 quality %)

Zn has the effect of the intensity that improves aluminium alloy.Zn contains quantity not sufficient 3.0 quality %, and then this effect is little, on the other hand, when the content of Zn surpasses 9.0 quality %, produce thick intermetallic compound, easily produce color spot, perhaps anti-SCC (anticorrosion stress-resistant cracking) property reduction on the appearance after pellumina is handled.Therefore, Zn content is made as below 3.0~9.0 quality %.

(Mg:0.4~4.0 quality %)

Mg has the effect of the intensity that improves aluminium alloy, Mg contains quantity not sufficient 0.4 quality %, then this effect is little, on the other hand, when Mg content surpasses 0.4 quality %, produce thick intermetallic compound, easily produce color spot, perhaps anti-SCC (anticorrosion stress-resistant cracking) property reduction on the appearance after pellumina is handled.Therefore, Mg content is made as 0.4~4.0 quality %.

(Cu:3.0 quality % is following)

Cu has solid solution improves intensity in aluminium alloy effect, and on the other hand, when Cu content surpassed 3.0 quality %, Al-Zn-Mg was that the corrosion resistance of alloy reduces.Therefore, Cu content is made as below the 3.0 quality %.

(Zr:0.25 quality % is following)

Zr has the crystal grain miniaturization that makes aluminium alloy, the effect of stabilisation.On the other hand, when Zr content surpasses 0.25% quality, produce thick intermetallic compound, easily produce color spot on the appearance after pellumina is handled.Therefore, Zr content is made as below the 0.25 quality %.

(below the Si:0.7 quality %, below the Fe:0.8 quality %, below the Mn:0.8 quality %, below the Cr:0.5 quality %, below the Ti:0.1 quality %)

Si, Fe, Mn, Cr, Ti effect separately and Al-Mg are that the effect in the alloy is identical, therefore omit.

In addition, Al-Mg is that alloy, Al-Mn are that alloy, Al-Mg-Si are that alloy, Al-Zn-Mg are in any of alloy, content as V, the B etc. of unavoidable impurities as long as be respectively below the 0.01 quality %, does not then influence the characteristic of aluminium alloy thick plate of the present invention.But, ingot casting crackle when preventing that slab from making ingot, the form of the miniaturization agent that Ti is constituted with the foundry alloy by itself and B is added sometimes, as described later, when thick Ti-B particle did not dissolve fully, surface treatments such as pellumina processing sometimes or electroplating processes produced black line later on.Therefore, preferably use the miniaturization agent of Al-Ti etc., do not add B.Even owing to the interpolation of B has produced black line, as described later, handle by carrying out suitable smoothing, also can remove black line.

[manufacture method of aluminium alloy thick plate]

Then, with reference to accompanying drawing, the manufacture method of aluminium alloy thick plate of the present invention is described.Fig. 1 is the flow chart of the manufacture method of expression aluminium alloy thick plate of the present invention.For the manufacture method of aluminium alloy thick plate of the present invention, at first, the aluminium alloy of described arbitrary composition is fused into aluminium alloy solution (fusion operation S11), remove hydrogen and field trash (dehydrogenation operation S12, filter operation S13) respectively from aluminium alloy solution.Aluminium alloy solution is cast and made ingot casting (casting process S14), ingot casting is rolled into specific thickness and makes hot rolled plate (hot-rolled process S30), and, hot rolled plate is cut off (cutting off operation S50), will finish (smoothing treatment process S70) after the surface smoothingization.In addition, also can be before hot rolling, make ingot casting homogenize (all heat treatment step S20) by heat treatment.In addition, it is further also can to correct (correction process S40) to the distortion of hot rolled plate, also can anneal to hot rolled plate (annealing operation S60).In addition, operate like this and after the aluminium alloy thick plate made via checking operation S80, resin molding lining operation S90, the table back side is covered by resin molding and becomes product form.In addition, among Fig. 1, consider that via finishing behind the resin molding lining operation S90, but aluminium alloy thick plate of the present invention is an aluminium alloy thick plate of having finished the stage of smoothing treatment S 70 from angle easily.Below, the details of each operation is described.

(fusion operation)

Fusion operation S11 is the operation that the aluminium alloy of composition that will regulation fuses into aluminium alloy solution, is undertaken by known equipment, method.

(dehydrogenation operation)

Dehydrogenation operation S12 is the operation of removing hydrogen from aluminium alloy solution, and it can suitably remove dehydrogenation by aluminium alloy solution being purified (fluxing), chlorine refining or vertical survey line refining.In addition,, use air-breathing rotary type dehydrogenation units such as (SNIFF) or porous plug (porous plug) (with reference to TOHKEMY 2002-146447 communique) when carrying out, can more suitably remove as dehydrogenation unit.

(filtration operation)

Filter the operation of operation S13 for mainly removing oxide and nonmetallic field trash from aluminium alloy solution by filter.In filter, be provided with and used for example earthenware of the aluminium oxide of the particle about 1mm, pass through therein, can remove described oxide and field trash by making aluminium alloy solution.

By dehydrogenation operation S12 and filtration operation S13, can in follow-up casting process S14, make the high-quality aluminium alloy cast ingot that can suppress internal flaw.In addition, the accumulation of the deposit (scum silica frost (dross)) of oxide can be suppressed, therefore, operation can be reduced except that removing dross.

(casting process)

Casting process S14 is used for for example utilizing the casting device that comprises junker mold and constitute, and aluminium alloy solution is formed rectangular shape isotactic setting shape and it is solidified and makes the operation of aluminium alloy cast ingot.As casting method, can use the semi-continuous casting method.The semi-continuous casting method is the solution of metal to be injected the open metal junker mold in bottom from the top, and takes out the metal that solidifies continuously from the bottom of junker mold and obtain the method for the ingot casting of specific thickness.This semi-continuous casting method can be according to vertically, laterally any carries out.

(equal heat treatment step-treatment temperatures: more than 400 ℃ and the fusing point of not enough aluminium alloy, the processing time: more than 1 hour)

All heat treatment step S20 is used for removing internal stress by aluminium alloy cast ingot is implemented heat treatment, and the solute element of segregation homogenizes when making casting, the intermetallic compound solid solution diffusion that crystallization goes out when making casting, the operation that tissue is homogenized.Heat treatment is according to method commonly used, with more than 400 ℃ and the temperature of the fusing point of not enough aluminium alloy keep 1 hour with on carry out.All the heat treatment temperature less than is 400 ℃, and then described effect is insufficient.In addition, processing time less than 1 hour, then the solid solution of intermetallic compound is insufficient, separates easily.On the other hand, when all heat treatment temperature reaches the fusing point of aluminium alloy of the present invention, the phenomenon that is called burning (burning) of part fusion on the surface of aluminium alloy cast ingot taking place, easily causes the blemish of aluminium alloy thick plate.Therefore, all heat treatment temperature is more than 400 ℃ and the fusing point of not enough aluminium alloy, carries out more than 1 hour.

(hot-rolled process)

Hot-rolled process S30 is the operation that aluminium alloy cast ingot is rolled into the sheet material (aluminum alloy hot rolling plate) of specific thickness.As hot-rolling method, can use reversible (reversible) hot-rolling mill.Aluminium alloy cast ingot is warming up to set point of temperature, depresses, make the aluminum alloy hot rolling plate of specific thickness by utilizing reversible hot rolling mill.Thickness of slab in this operation (thickness of slab of aluminum alloy hot rolling plate) is preferably 15~200mm for the desirable thickness of slab of aluminium alloy thick plate being added the thickness of slab of the minimizing thickness that smoothing treatment process S70 described later brings.

(correction process)

Correction process S40 is that the operation that makes its planarization is corrected in the distortion that produces in the hot rolling to the aluminum alloy hot rolling plate, utilizes known equipment, methods such as seven-roll Abramsen machine (stretcher) or tension force straightening machine to carry out.

(cut-out operation)

Cutting off operation S50 is the operation that the aluminum alloy hot rolling plate is cut into desirable length (and width).

(annealing operation)

Annealing operation S60 is by aluminium alloy thick plate is implemented heat treatment, removes internal stress or makes the operation of interior tissue homogenization.In addition, also can implement to utilize solution treatment and timeliness to handle carry out modified.In addition, these processing also can be carried out after smoothing treatment process S70.In addition, for example shown in Japanese kokai publication sho 63-115617 communique, can improve surperficial flatness by implementing heat treatment.

(smoothing treatment process)

Smoothing treatment process S70 is surface (rolling surface) smoothing with the aluminum alloy hot rolling plate, and the operation that thickness of slab is regulated.

At this, to be made as every single face be 2~5mm to the thickness of removing on the surface of hot rolled plate.Be made as more than the 2mm by removing thickness, can be with the bias adjustment of flatness, thickness of slab to desirable value, and can suppress the blemish that flaw causes.

In addition, as mentioned above, in recent years, there are the following problems, promptly, even there is not defective on the raw sheet, after the surface treatment of having implemented pellumina processing or electroplating processes etc., also have trouble in the blemish that produces the black line shape about about 3 μ m length on the rolling parallel direction, after the inventor has carried out investigation with great concentration to its reason, found that this blemish ingot casting crackle prevents or near the Ti-B of the ingot casting miniaturization agent (crystal grain miniaturization agent) when casting the quench solidification portion mold of ingot of making at slab does not melt fully and causes.Therefore, be made as more than the 2mm, even fusing fully of ingot casting miniaturization agent Ti-B also can be removed, even carry out that pellumina is handled or electroplating processes also can not produce the blemish of black line shape by removing thickness.In addition, from the viewpoint of yield rate and cost performance, remove thickness and be made as below the 5mm.

As smoothing processing, can use cutting methods such as end mill (end mill) cutting or diamond bit (diamond bite) cutting, utilize whetslate etc. to the surface grind cut grind polishings such as the method for cutting, polishing (buffing) grinding etc., but be not limited to these.

In addition, among the smoothing treatment process S70, after the blemish that deviation, flaw and the black line etc. of inhibition flatness, thickness of slab cause, can further implement hair line processing (hairline process).By implementing hair line processing, can be at the rolling scale of slab surface mark.As the hair line method for processing, what know is belt or Ginding process such as wheeled, but can take any method, as the grinding nonwoven that uses in belt or wheeled etc. the hair line processing, what know is to be the grinding nonwoven that the monomer of aluminium oxide, carborundum, zirconia etc. or their mixture and bonding agents such as resin or glue constitute by the abrasive particle kind, as granularity, in commercially available product, can enumerate thicker #120~#220.In addition, under the situation of rotation external diameter of using band or wheel, contain and prevent to burn coherent lubricating grease, therefore, preferably carry out hair line processing, but be not limited to these conditions with the rotating speed below the 1500rpm as the grinding nonwoven of φ 400mm.

In addition, about the blemish that flaw causes, the size of the flaw that people's naked eyes are visual is more than the degree of depth 8 μ m, and the size that is difficult to the flaw judged during inspection is also to the degree of depth 20 μ m, but 8~20 μ m degree of depth are being pressed into of foreign matter or the generation of roll flaw, and this type of defective is not original functional defect.Therefore, the flaw that is pressed into like this has following effect, promptly, can be by implementing to be equivalent to the processing of hair line processing (processing capacity (Japanese: process generation) is 2~3 μ m), make partes glabra, flaw and the border on slab surface be in smooth state, therefore, can easily carry out distinguishing of itself and functional defect.In addition, if ignore economy, even then only carry out hair line processing, if more than every single face cutting 2mm, also can obtain effect of the present invention.

And the aluminium alloy thick plate of making for as above operating is afterwards by checking operation S80, to distortion, thickness of slab, and after surface blemish etc. checks, by resin molding lining operation S90, utilize the resin molding covering table back side.

Embodiment

More than, set forth being used to implement optimum way of the present invention, below, with confirming the embodiment of effect of the present invention, compare with the comparative example that can not satisfy condition of the present invention, and describe particularly.In addition, the present invention is not limited to this embodiment.

[embodiment 1: the test material manufacturing]

(Al-Mg is an alloy)

With aluminium alloy (5k:JIS5052 alloy, 5l:JIS5083 alloy, 5v do not add Ti, the B) fusion of the composition of the alloy No.5a~5v shown in the table 1, after carrying out dehydrogenation and handling, filter, cast and manufacture the ingot casting of thickness of slab 500mm.This ingot casting after 500 ℃ heating was heat-treated in 4 hours down, is carried out hot rolling, manufacture the aluminum alloy hot rolling plate of about 25mm of thickness and the about 20mm of thickness.After this aluminum alloy hot rolling plate cut into the long 2000mm of rolling direction * wide 1000mm, rolling surface (two sides) is carried out smoothing handle, make the aluminium alloy thick plate (cut-out plate) of thickness 20mm.In addition, for the alloy that contains Ti,, add the Ti-B foundry alloy in order to prevent the ingot casting crackle.Smoothing is handled with end mill processing, end mill processing+hair line processing (utilizing belt to grind nonwoven), hair line and is processed this three kinds of methods, and effect is compared.In addition, implement the aluminum alloy hot rolling plate of end mill processing, the aluminum alloy hot rolling plate of the about 25mm of used thickness is only implemented the aluminum alloy hot rolling plate that hair line is processed, the aluminum alloy hot rolling plate of the about 20mm of used thickness.

End mill processing is the end mill processing machine (milling cutter) of WASSER GmbH system (machine-building merchant, the GmbH of Germany are Co., Ltd.) to be transformed the back use.Thick sheet is superhard, and the fine finishining sheet is a diamond, and processing capacity is the amount of being pressed into from the disk at zero point, regulates and processes according to the mode that amounts to about 2.5mm/ single face.

Particularly, 30 thick sheets, 2 fine finishining sheets are installed near the circumference below disk, are rotated after disk is reduced to machined object,, carry out machining by sending to the plate length direction.In addition, install according to the mode that fine finishining sheet overhang is more outstanding slightly than thick sheet, therefore, the form that the face that formation fine finishining sheet cuts thick sheet subsequently cuts.

The mechanical Co., Ltd. of wild water (Nomizu Machine Mfg.Co., Ltd.) aluminium sheet of system polishing grinder are transformed and used to hair line processing according in polishing mixing roll portion the mode of grinding the nonwoven wheel being installed.Wheel uses the light Yang She of Co., Ltd. (KOYO-SHA Co., Ltd.) Port リ テ Star Network ス (POLITEX registration mark) KF of system wheel MA (coarse grain (#150), external diameter Φ 400mm, impregnation lubricating grease, use brown fused alumina, use resin binder as bonding agent as the abrasive particle kind).

Then, be the condition (having swing (two is reciprocal)) of about 3.0 μ m/ single faces with processing capacity, implement to grind.In addition, about amount of grinding (Japanese: grind generation), utilize " WYKO NT3300 (the surface shape measuring system) " of Vecoo instrument Inc. system (U.S.) that the inhomogeneous of test polishing portion carried out measuring shape, and measure the concavo-convex degree of depth, measure affirmation.

(Al-Mn alloy)

With aluminium alloy (3e does not add Ti, the B) fusion of the composition of the alloy No.3a~3a shown in the table 1, after carrying out dehydrogenation and handling, filter, cast and manufacture the ingot casting of thickness of slab 500mm.This ingot casting is carried out hot rolling, manufacture the aluminum alloy hot rolling plate of about 25mm of thickness and the about 20mm of thickness.After this aluminum alloy hot rolling plate cut into the long 2000mm of rolling direction * wide 1000mm, rolling surface (two sides) is carried out smoothing handle, make the aluminium alloy thick plate (cut-out plate) of thickness 20mm.In addition, for the aluminium alloy that contains Ti,, add the Ti-B foundry alloy in order to prevent the ingot casting cracking.Smoothing is handled with end mill processing, end mill processing+hair line processing (utilizing belt to grind nonwoven), three kinds of methods of hair line processing, and effect is compared.In addition, implement the aluminum alloy hot rolling plate of end mill processing, the aluminum alloy hot rolling plate of the about 25mm of used thickness is only implemented the aluminum alloy hot rolling plate that hair line is processed, the aluminum alloy hot rolling plate of the about 20mm of used thickness.In addition, about end mill processing, hair line method for processing, be that the situation of alloy is identical with above-mentioned Al-Mg.

[table 1]

*: the outer * * of suitable scope: comprise unavoidable impurities

[embodiment 1: estimate]

Resulting aluminium alloy thick plate is carried out following evaluation, show the result in table 2,3.In addition, make and do not implement the aluminum alloy hot rolling plate (thickness 20nm) that smoothing is handled, estimate as a comparative example.In addition, alloy No.5n can not manufacture the aluminum alloy hot rolling plate as described later, and therefore, therefore processing and evaluation after not implementing, are represented with "-" in the table 2,3.

(flatness)

Flatness is estimated the amount of bow (flatness) of the every 1m of rolling direction of test material is measured.The qualified benchmark of flatness is that flatness is below the 0.2mm/m.

(thickness of slab precision)

Use micrometer measure from four jiaos of test material, and from half position of the length on the limit of rolling direction to the thickness of slab of 6 of the totals at the position of the inboard 20mm of width.For whole 6 thicknesss of slab, will (situation of 19.94~20.06mm) scope be considered as thickness of slab precision excellence at 20.0 ± 0.06mm, and be evaluated as " ◎ ", (situation of 20.0mm ± 0.5%, 19.90~20.10mm) scope is considered as well, and is evaluated as " zero " with 20.0 ± 0.10mm.

(intensity)

Cut out JIS5 number tension test sheet from test material.Utilize this test film, implement the stretching experiment of JISZ2241, measure hot strength and endurance (0.2% endurance).The qualified benchmark of intensity is: the hot strength of alloy No.5a~5u (Al~Mg is an alloy) is 180N/mm 2More than, the hot strength of alloy No.3a~3d (Al~Mn is an alloy) is 90N/mm 2More than.

(surface texture)

In order to estimate the influence of smoothing processing to surface texture, test material (each 40) is carried out pellumina handle, observe this surperficial outward appearance.

Utilize sulfuric acid oxidation aluminium film to handle (15% sulfuric acid, 20 ℃, current density 2A/dm 2), forming thickness on the surface of test material is the aluminium oxide epithelium of 10 μ m.And, studied the surface texture of surperficial flaw generation and the surface texture that black line produces.

[the surface texture evaluation that the flaw after pellumina is handled produces]

Observe this carry out the outward appearance on the surface of pellumina processing, it is very good that the situation that 40 middle neither one unaided eye discriminations are gone out the cut-out plate of flaw is considered as the surface texture evaluation that flaw produces, and be evaluated as " ◎ ", it is good that the situation that has 1~4 unaided eye discrimination to go out the cut-out plate of flaw in 40 is considered as the surface texture evaluation that flaw produces, and be evaluated as " zero ", the situation that has 5 above unaided eye discriminations to go out the cut-out plate of flaw in 40 is considered as surface texture that flaw produces estimates badly, and be evaluated as " * ".

[the surface texture evaluation that the black line after pellumina is handled produces]

The black line (not being functional defect) on the pellumina surface of handling of having observed above-mentioned carrying out, it is good that the plate of the black line that is invisible to the naked eye is considered as the surface texture evaluation that black line produces, and be evaluated as " zero ", the plate of with the naked eye seeing black line is considered as surface texture that black line produces estimates badly, and be evaluated as " * ".

In addition, the surface texture that also color spot on surface is produced is studied.In addition, nothing but desirable surface texture, therefore,,, be the purpose that reaches minimum of the present invention as this surface texture of the present invention for the aluminium alloy thick plate of the surface texture that satisfies the generation of flaw and black line even under the situation that does not satisfy this surface texture.

[the surface texture evaluation that the color spot after pellumina is handled produces]

Observe above-mentioned outward appearance of having carried out the surface of pellumina processing, the surface texture evaluation that is considered as the color spot generation of color spot is not good with having in appearance, and be evaluated as " zero ", with existing the surface texture that color spot produces of being considered as of color spot to estimate badly, and be evaluated as " * ".

In addition, implement the processing of end mill processing+hair line, and the value of only implementing the intensity of hair line processing equate that with the value of the intensity of only implementing end mill processing therefore, omission is put down in writing in table.

[table 2]

*: outside the suitable scope

For alloy No.5a~5l, and the aluminium alloy thick plate that constitutes of 5v, its content that adds element and has been implemented suitable smoothing to the surface and has been handled in suitable scope, therefore, intensity, flatness, thickness of slab precision, and surface texture good.In addition, compare, also can obtain full intensity and surface of good proterties with the aluminum alloy hot rolling plate of not implementing the smoothing processing.With respect to this, for the aluminium alloy thick plate that alloy No.5m constitutes, Mg contains quantity not sufficient, therefore, can not obtain full intensity.On the other hand, for the aluminium alloy thick plate that alloy No.5n constitutes, therefore casting crack, take place in Mg content surplus, can not carry out the manufacturing of test material.For Si, Fe, Mn, Cr content difference surplus in the aluminium alloy thick plate of alloy No.5o, 5p, 5r, 5s formation, therefore, form thick intermetallic compound, and the color spot of generation in appearance on the surface after pellumina is handled.In the aluminium alloy thick plate for alloy No.5q, 5t, 5u formation, Cu, Zn, Ti content have surpassed suitable scope respectively, alloy No.5f, 5j, 5c in suitable scope compares with these elements, do not find the raising of effect on intensity and surface texture.

In addition, difference about the method for surface smoothing processing, can confirm to compare with the hair line processing that only the enforcement amount of removing is few, the end mill processing+hair line that the enforcement amount of removing is suitable is processed or is only implemented under the situation of end mill processing, and the surface texture of flaw generation improves.In addition, though the flaw of finding on the cut-out plate of existing hot rolled plate be comprise the inadequate detectable size of naked eyes, on function complete no problem small flaw and judge that the flaw of only implementing to find on the cut-out plate of hair line processing is can be by the visual clearly flaw of discovery.Therefore can confirm, even only implement hair line processing, also easy this effect of the difference of functional defect.

In addition, also confirmed only to implement under the situation of hair line processing, because the amount of removing is few, therefore, can not prevent that black line from producing, only implement end mill processing, perhaps implement under the situation of end mill processing+hair line processing, because the amount of removing is suitable, therefore, can prevent that black line from producing.In addition, also confirmed the aluminium alloy thick plate that 5v constitutes owing to when slab is made ingot, do not use the Ti-B of ingot casting miniaturization agent, therefore, can not be subjected to the different influence of surface smoothing processing method, the method for any surface smoothing processing can both prevent that black line from taking place.

For the aluminium alloy thick plate that alloy No.3a, 3b, 3e constitute, the content that adds element and is implemented suitable smoothing from the teeth outwards and is handled in suitable scope, therefore, intensity, flatness, thickness of slab precision, and surface texture good.In addition, even compare, also can obtain full intensity and surface of good proterties with the aluminum alloy hot rolling plate of not implementing the smoothing processing.With respect to this, for the aluminium alloy thick plate that alloy No.3c constitutes, Mn contains quantity not sufficient, therefore, can not obtain full intensity.On the other hand, for the aluminium alloy thick plate that alloy No.3d constitutes, therefore Mn content surplus, forms thick intermetallic compound, and the color spot of generation in appearance on the surface after pellumina is handled.

In addition, difference about the method for surface smoothing processing, can confirm that the hair line processing few with only implementing the amount of removing compares, implement the suitable end mill processing+hair line processing of the amount of removing or only implement the surface texture raising that flaw produces under the situation of end mill processing.In addition, though the flaw of finding on the cut-out plate of present hot rolled plate be comprise the inadequate detectable size of naked eyes, on function complete no problem small flaw and judge that the flaw of only implementing to find on the cut-out plate of hair line processing is can be by the visual clearly flaw of discovery.Therefore can confirm, even only implement hair line processing, also easy this effect of the difference of functional defect.

In addition, also confirmed only to implement under the situation of hair line processing, because the amount of removing is few, therefore, can not prevent that black line from producing, only implement end mill processing, perhaps implement under the situation of end mill processing+hair line processing, because the amount of removing is suitable, therefore, can prevent that black line from producing.In addition, also confirmed the aluminium alloy thick plate that 3e constitutes owing to when slab is made ingot, do not use the Ti-B of ingot casting miniaturization agent, therefore, be not subjected to the different influence of surface smoothing processing method, the method for any surface smoothing processing can both prevent that black line from taking place.

The aluminum alloy hot rolling plate savings processing of not implementing the smoothing processing is bad, and crooked big on the rolling direction, flatness is bad.In addition, the thickness of slab precision compare with the aluminium alloy plate of same composition poor mostly slightly.In addition, the surface texture of flaw and black line generation is bad.In addition, only implement hair line processing flatness value and cut off the value of evaluation and the flatness of aluminium hot rolled plate (not carrying out smoothing handles) of thickness of slab precision of plate and the evaluation of the thickness of slab precision of cut-out plate identical (when processing capacity is 2~3 μ m, fail to alleviate the machining deformation of savings, therefore, crooked big on the rolling direction, flatness is bad).

[embodiment 2: the test material manufacturing]

(Al-Mg-Si is an alloy)

With the aluminium alloy fusion of the composition of the alloy No.6a~6g shown in the table 4, after carrying out dehydrogenation and handling, filter, cast and manufacture the ingot casting of thickness of slab 500mm.With this ingot casting hot rolling, manufacture the aluminum alloy hot rolling plate of about 25mm of thickness and the about 20mm of thickness.After this aluminum alloy hot rolling plate cut into the long 2000mm of rolling direction * wide 1000mm, rolling surface (two sides) is carried out smoothing handle, make the aluminium alloy thick plate (cut-out plate) of thickness 20mm.In addition, for the aluminium alloy that contains Ti,, add the Ti-B foundry alloy in order to prevent the ingot casting cracking.Smoothing is handled with end mill processing, end mill processing+hair line processing (utilizing belt to grind nonwoven), hair line and is processed these three kinds of methods effect is compared.In addition, implement the aluminum alloy hot rolling plate of end mill processing, the aluminum alloy hot rolling plate of the about 25mm of used thickness is only implemented the aluminum alloy hot rolling plate that hair line is processed, the aluminum alloy hot rolling plate of the about 20mm of used thickness.In addition, about end mill processing, hair line method for processing, be that the situation of alloy is identical with described Al-Mg.In addition, under 520 ℃, the aluminium alloy thick plate that obtains is carried out solution treatment, 175 ℃ of Ageing Treatment of implementing 8 hours down.

(Al-Zn-Mg alloy)

With the aluminium alloy fusion of the composition of the alloy No.7a~7g shown in the table 4, after carrying out dehydrogenation and handling, filter, cast and manufacture the ingot casting of thickness of slab 500mm.With this ingot casting hot rolling, manufacture the aluminum alloy hot rolling plate of about 25mm of thickness and the about 20mm of thickness.After this aluminum alloy hot rolling plate cut into the long 2000mm of rolling direction * wide 1000mm, rolling surface (two sides) is carried out smoothing handle, make the aluminium alloy thick plate (cut-out plate) of thickness 20mm.In addition, for the aluminium alloy that contains Ti,, add the Ti-B foundry alloy in order to prevent the ingot casting cracking.Three kinds of methods that smoothing is handled with end mill processing, end mill processing+hair line processing (utilizing belt to grind nonwoven), hair line processing compare effect.In addition, implement the aluminum alloy hot rolling plate of end mill processing, the aluminum alloy hot rolling plate of the about 25mm of used thickness is only implemented the aluminum alloy hot rolling plate that hair line is processed, the aluminum alloy hot rolling plate of the about 20mm of used thickness.In addition, about end mill processing, hair line method for processing, be that the situation of alloy is identical with described Al-Mg.In addition, under 470 ℃, the aluminium alloy thick plate that obtains is carried out solution treatment, 120 ℃ of Ageing Treatment of implementing 48 hours down.

[table 4]

*: the outer * * of suitable scope: comprise unavoidable impurities

[embodiment 2: estimate]

With the aluminium alloy thick plate that obtains, carry out the evaluation of intensity and surface texture by the method identical with embodiment 1, show the result in table 5,6.In addition, make and do not implement the aluminum alloy hot rolling plate (thickness 20nm) that smoothing is handled, carry out solution treatment and timeliness processing with identical condition, and estimate as a comparative example.The qualified benchmark of intensity is: the hot strength of alloy No.6a~6g (Al-Mg-Si is an alloy) is 200N/mm 2More than, the hot strength of alloy No.7a~3g (Al-Zn-Mg is an alloy) is 250N/mm 2More than.

In addition, the value that the intensity of only implementing hair line processing was processed, reached to end mill processing+hair line equates with the value of the intensity of only implementing end mill processing, therefore, omits in table and puts down in writing.

[table 5]

*: outside the suitable scope

[table 6]

*: outside the suitable scope

For the aluminium alloy thick plate that alloy No.6a, 6b, 6g constitute, its content that adds element and is implemented suitable smoothing from the teeth outwards and is handled in suitable scope, and therefore, intensity and surface texture are good.In addition, even compare, also can obtain full intensity and surface of good proterties with the aluminum alloy hot rolling plate of not implementing the smoothing processing.With respect to this, for the aluminium alloy thick plate that alloy No.6c, 6e constitute, Si, Mg content are not enough respectively, therefore, can not obtain full intensity.On the other hand, for the aluminium alloy thick plate that alloy No.6d constitutes, therefore Si content surplus, forms thick intermetallic compound, and the color spot of generation in appearance on the surface after pellumina is handled.In addition, aluminium alloy thick plate for alloy No.6f formation, Mg content surplus, therefore, become the characteristic of Al-Mg system (5000 is Al) alloy, therefore, can not obtain handling the intensity of bringing and improve effect by solution treatment and timeliness, alloy No.6a, 6b in OK range compares with Mg content, and intensity reduces.

In addition, difference about the method for surface smoothing processing, can confirm that the hair line processing few with only implementing the amount of removing compares, implement the suitable end mill processing+hair line processing of the amount of removing or only implement the surface texture raising that flaw produces under the situation of end mill processing.In addition, though the flaw of finding on the cut-out plate of present hot rolled plate be comprise the inadequate detectable size of naked eyes, on function complete no problem small flaw and judge that the flaw of only implementing to find on the cut-out plate of hair line processing is can be by the visual clearly flaw of discovery.Therefore, even only implement hair line processing, also can confirm easy this effect of difference of functional defect.

In addition, also confirmed only to implement under the situation of hair line processing, because the amount of removing is few, therefore, can not prevent that black line from producing, only implement end mill processing, perhaps implement under the situation of end mill processing+hair line processing, because the amount of removing is suitable, therefore, can prevent that black line from producing.In addition, also confirmed the aluminium alloy thick plate that 6g constitutes owing to when slab is made ingot, do not use the Ti-B of ingot casting miniaturization agent, therefore, can not influence the difference of the method for surface smoothing processing, the method for any surface smoothing processing can both prevent that black line from taking place.

For the aluminium alloy thick plate that alloy No.7a, 7b, 7g constitute, the content that adds element and is implemented suitable smoothing from the teeth outwards and is handled in suitable scope, and therefore, intensity and surface texture are good.In addition, even compare, also can obtain full intensity and surface of good proterties with the aluminum alloy hot rolling plate of not implementing the smoothing processing.With respect to this, for the aluminium alloy thick plate that alloy No.7c, 7e constitute, Mn, Zn content are not enough respectively, therefore, can not obtain full intensity.On the other hand, for the aluminium alloy thick plate that alloy No.7d, 7f constitute, Mg, Zn content are superfluous respectively, therefore, form thick intermetallic compound, and the color spot of generation in appearance on the surface after pellumina is handled.

In addition, difference about the method for surface smoothing processing, can confirm that the hair line processing few with only implementing the amount of removing compares, implement the suitable end mill processing+hair line processing of the amount of removing or only implement under the situation of end mill processing, the surface texture raising that produces by flaw.In addition, though the flaw of in the cut-out plate of in the past hot rolled plate, finding by differentiation be comprise the inadequate detectable size of naked eyes, on function no problem small flaw fully, the flaw of finding in the cut-out plate of only implementing hair line processing is can be by the visual clearly flaw of discovery.Therefore can confirm following effect, even only implement hair line processing, the differentiation of functional defect is also than being easier to.

In addition, also confirmed only to implement under the situation of hair line processing, because the amount of removing is few, therefore, can not prevent that black line from producing, and only implement under the situation of end mill processing or the processing of enforcement end mill processing+hair line, because the amount of removing is suitable, therefore, can prevent that black line from producing.In addition, also confirmed the aluminium alloy thick plate that 7g constitutes owing to when slab is made ingot, do not use the Ti-B of ingot casting miniaturization agent, therefore, be not subjected to the different influence of method of surface smoothing processing, the method for any surface smoothing processing can both prevent that black line from taking place.

As described above, aluminium alloy thick plate of the present invention as can be known has good flatness and thickness of slab precision, and can suppress the blemish that flaw and black line cause, and has the surface of good proterties.In addition, be grouped into by the one-tenth that various alloys are set suitably as can be known, can improve characteristics such as intensity, in addition, can suppress the color spot on surface, make surface texture better.

Claims (10)

1. aluminium alloy thick plate forms the surface smoothingization of aluminum alloy hot rolling plate, it is characterized in that,
The flatness on surface is below the 0.2mm in every 1m length on the rolling direction,
The deviation of thickness of slab is in desired thickness of slab ± 0.5%.
2. aluminium alloy thick plate according to claim 1 is characterized in that, constitutes by aluminium alloy,
Described aluminium alloy contains Mg:1.5~12.0 quality %, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:0.6 quality % is following, Mn:1.0 quality % is following, Cr:0.5 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, and surplus is made of Al and unavoidable impurities.
3. aluminium alloy thick plate according to claim 1 is characterized in that, constitutes by aluminium alloy,
Described aluminium alloy contains Mn:0.3~1.6 quality %, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:0.5 quality % is following, Mg:1.5 quality % is following, Cr:0.3 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, and surplus is made of Al and unavoidable impurities.
4. aluminium alloy thick plate according to claim 1 is characterized in that, constitutes by aluminium alloy,
Described aluminium alloy contains Mg:0.3~1.5 quality %, Si:0.2~1.6 quality %, contain also that Fe:0.8 quality % is following, Cu:1.0 quality % following, Mn:0.6 quality % is following, Cr:0.5 quality % is following, Zn:0.4 quality % is following, Ti:0.1 quality % more than one in following, and surplus is made of Al and unavoidable impurities.
5. aluminium alloy thick plate according to claim 1 is characterized in that, constitutes by aluminium alloy,
Described aluminium alloy contains Zn:3.0~9.0 quality %, Mg:0.4~4.0 quality %, contain also that Si:0.7 quality % is following, Fe:0.8 quality % following, Cu:3.0 quality % is following, Mn:0.8 quality % is following, Cr:0.5 quality % is following, Ti:0.1 quality % is following, Zr:0.25 quality % more than one in following, surplus is made of Al and unavoidable impurities.
6. the manufacture method of an aluminium alloy thick plate, it is a manufacture method of making the described aluminium alloy thick plate of claim 1, it is characterized in that, carries out following operation:
Aluminium alloy is fused into the fusion operation of aluminium alloy melting; Remove the dehydrogenation operation of hydrogen from described aluminium alloy melting; Remove the filtration operation of field trash from the aluminium alloy melting of having removed described hydrogen; The aluminium alloy melting of having removed described field trash is cast and make the casting process of ingot casting; Described ingot casting is rolled into specific thickness and makes the hot-rolled process of hot rolled plate; Described hot rolled plate is cut into the rolling direction length of regulation and the cut-out operation of width; With the smoothing treatment process of the surface smoothingization of the hot rolled plate after the described cut-out,
In described smoothing treatment process, the thickness of removing on the surface of described hot rolled plate is 2~5mm at each face.
7. the manufacture method of aluminium alloy thick plate according to claim 6, it is characterized in that, before described hot-rolled process, carry out equal heat treatment step, described equal heat treatment step by more than 400 ℃ and the heat treatment of under the temperature of the fusing point of not enough described aluminium alloy described ingot casting being carried out more than 1 hour carry out.
8. the manufacture method of aluminium alloy thick plate according to claim 6 is characterized in that, before described smoothing treatment process, carries out the annealing operation with the annealing of the hot rolled plate after the described cut-out.
9. the manufacture method of aluminium alloy thick plate according to claim 6 is characterized in that, described smoothing treatment process is carried out by cutting method, more than grinding in the method for cutting and the polishing any.
10. the manufacture method of aluminium alloy thick plate according to claim 6 is characterized in that, described aluminium alloy is each described aluminium alloy in the claim 2~5.
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EP2263811A1 (en) 2010-12-22
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