JPS61186110A - Aluminum and aluminum alloy sheet for deep drawing - Google Patents

Abstract

PURPOSE:To improve a limiting drawing rate in deep drawing and to improve also deep-drawability by forming the rough surface of a titled sheet, wherein the crests of specific height exist, in number, not less than those of required numbers, with the aid of a surface-roughened roll. CONSTITUTION:An aluminum or aluminum alloy sheet for deep drawing, is rolled by a surface-roughened roll; so that the height of a highest crest is in a range of 2-20mum within a measuring length of 25.4mm, and the number of crests, having each a >=1.27mum height, are >=25 within the measuring length of 25.4mm, in the parallel or perpendicular direction to at least the rolling direction. When the height of the crest is in the range 2mum to 10mum, a limiting drawing rate is improved but Rm is approximated to 20mum, the limiting drawing rate is lowered. Further, the productivity if lowered when the number of crests are excessive. In this way, the deep drawability can be improved.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、鍋や缶等の器物、容器のキャップ、食缶、弗
素樹脂をコーティングした厨房器具等の深絞り加工成形
品の素材となるアルミニウム及びアルミニウム合金板に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a material for deep drawing molded products such as utensils such as pots and cans, container caps, food cans, and kitchen utensils coated with fluororesin. Regarding aluminum and aluminum alloy plates.

［従来の技術とその問題点コ 従来、上記のような深絞り加工用アルミニウム及びアル
ミニウム合金板としては、いわゆるダル仕上面（ＤＣ）
を有するＤＣ板や、ブライト仕上面（ＢＣ）を有するＢ
Ｃ板が一般に使用されている。[Conventional technology and its problems] Conventionally, aluminum and aluminum alloy plates for deep drawing as described above have a so-called dull finish (DC).
DC board with a bright finish (BC)
C plate is commonly used.

ところで、深絞り加工成形品について従来から指摘され
ている課題としては、（ｉ）フローマークおよび耳の発
生を少なくすること、（ｉｉ）限界絞り率ＬＤＲをあげ
ること等がある。特に、深絞り加工成形品の寸法精度を
向上させるために、ポンチとダイスのクリアランスを少
なくしたり、薄肉軽量化のために強度の高い素材を使用
することが多くなっている昨今の状況においては、絞り
率を大きくすると、加工時に割れが多発するので、限界
絞り率ＬＤＲを向上させることは一層難しくなってきて
いる。By the way, problems that have been pointed out in the past regarding deep drawn products include (i) reducing the occurrence of flow marks and ears, and (ii) increasing the critical drawing ratio LDR. Particularly in the current situation, in order to improve the dimensional accuracy of deep-drawn products, the clearance between the punch and die is reduced, and high-strength materials are often used to reduce the thickness and weight of the products. If the drawing ratio is increased, cracks occur frequently during processing, so it is becoming more difficult to improve the limit drawing ratio LDR.

上記（ｉ）、（ｉｆ）の課題を解決するため、従来から
素材の合金成分及び製造法の最適化、深絞り加工法の改
良（潤滑剤の改良を含む）等が検討されているが、充分
な成果が得られていない。In order to solve the problems (i) and (if) above, optimization of the alloy composition of the material and manufacturing method, improvement of the deep drawing process (including improvement of the lubricant), etc. have been considered. Not enough results have been achieved.

［発明の背景］ ところで、上記（ｉ）の課題に関し、本発明者等は、既
にアルミニウム及びアルミニウム合金板の圧延に際して
、表面が粗面化された圧延ロールを用いて、板の表面を
従来のＤＣ板又はＢＣ仮より粗くすることにより、深絞
り加工成形品におけるフローマーク及び耳の発生を抑制
しうろことを見い出し、先に本件出願人が特許出願した
（特願昭５１−１９３４３１号）。[Background of the Invention] By the way, regarding the problem (i) above, the present inventors have already used a rolling roll with a roughened surface when rolling aluminum and aluminum alloy plates to improve the surface of the plate in a conventional manner. It was discovered that by making the scale rougher than the DC plate or BC plate, the generation of flow marks and ears in deep drawn products can be suppressed, and the applicant of the present invention previously filed a patent application (Japanese Patent Application No. 193431/1982).

その後、板の表面を粗さと深絞り加工性との関係につい
て更に研究を進めた結果、ある上限値を越えない範囲内
で板の表面を粗面化させることによって、フローマーク
及び耳の発生を抑制できるばかりでなく、限界絞り率Ｌ
ＤＲをも向上させうろという知見を得た。Subsequently, as a result of further research into the relationship between plate surface roughness and deep drawing workability, it was found that by roughening the plate surface within a range that does not exceed a certain upper limit, the occurrence of flow marks and ears can be reduced. Not only can it be suppressed, but the limit aperture ratio L
We have learned that it can also improve DR.

［発明の構成コ このような知見に基づき、本発明に係る深絞り加工用ア
ルミニウム及びアルミニウム合金板は、表面が粗面化さ
れた圧延ロールによって圧延され、その表面にロールの
粗面形状が転写されたものである。その場合、上記アル
ミニウム及びアルミニウム合金板の表面粗さは、少なく
とら圧延方向と平行又は直角な方向において、２５．４
ｍｍ（１インチ）の測定長内での最大粗さＲｍａｘ　（
添付図面参照）、つまり、上記２５．４＋＋＋＋ｎの測
定長内での最も高い山Ｍ。の高さが２〜２０μｍの範囲
となり、且つ上記２５．４ｍｍの測定長内での、高さが
１．２７μｍ（５０μインチ）以上の山Ｍ、Ｍ、・・・
の数（以下、単に山の数という。）が２５個以上となる
ように、上記圧延ロールによって調節される。[Structure of the Invention] Based on such knowledge, the aluminum and aluminum alloy plates for deep drawing according to the present invention are rolled by rolling rolls whose surfaces are roughened, and the rough surface shape of the rolls is transferred to the surface. It is what was done. In that case, the surface roughness of the aluminum and aluminum alloy plates is 25.4 at least in the direction parallel or perpendicular to the rolling direction.
Maximum roughness Rmax within the measurement length of mm (1 inch)
(see attached drawing), that is, the highest peak M within the measurement length of 25.4+++n. Mountains M, M,... with a height of 2 to 20 μm and a height of 1.27 μm (50 μ inch) or more within the measurement length of 25.4 mm.
The number of ridges (hereinafter simply referred to as the number of ridges) is adjusted by the above-mentioned rolling rolls so that it is 25 or more.

すなわち、本発明者の行った試験によれば、最大粗さＲ
ｍａｘ及び山の数が上記の下限値より小さい場合は、限
界絞り率ＬＤＲを充分に向上させろことができず、従っ
て、最大粗さＲｍａｘ及び山の数は、上記の下限値以上
に設定する必要がある。That is, according to the test conducted by the present inventor, the maximum roughness R
If the maximum roughness Rmax and the number of peaks are smaller than the lower limit value above, it is not possible to sufficiently improve the limiting reduction ratio LDR. Therefore, the maximum roughness Rmax and the number of peaks need to be set higher than the lower limit value above. There is.

又、最大粗さＲｎ＋ａｘが、上記の上限値を越える場合
は、限界絞り率ＬＤＲが従来のＤＣ板よりも低下するの
で、最大粗さＲｍａｘは上記の上限値以下とすることが
要求される。Furthermore, if the maximum roughness Rn+ax exceeds the above upper limit, the limiting reduction ratio LDR will be lower than that of the conventional DC plate, so the maximum roughness Rmax is required to be below the above upper limit.

［実施例］ 次に、代表例として、最大粗さＲｍａｘと山の数の異な
る曳数のアルミニウム合金板について、ダフニメカニッ
クオイルを使用して深絞り加工を行い、限界絞り率ＬＤ
Ｒと生産性の良否を調査した結果を表に示す。同表中、
各発明材はＲｍａｘと山の数が本発明の設定範囲内に収
まっているものであり、各比較材はＲｍａＸと山の数の
少なくとも一方が本発明の設定範囲から外れたものであ
る。この内、各発明材と比較材３，４は夫々粗面化ロー
ルで圧延され、比較材ｌは従来のＢＣ用ロールで圧延さ
れ、比較材２は従来のＤＣロールで圧延されたしのであ
る。[Example] Next, as a representative example, aluminum alloy plates with different maximum roughness Rmax and number of ridges were deep drawn using Daphne Mechanic Oil, and the limit drawing ratio LD
The results of investigating the quality of R and productivity are shown in the table. In the same table,
Each invention material has Rmax and the number of peaks within the set range of the present invention, and each comparative material has at least one of Rmax and the number of peaks outside the set range of the present invention. Among these, each invention material and comparative materials 3 and 4 were rolled with roughening rolls, comparative material 1 was rolled with a conventional BC roll, and comparative material 2 was rolled with a conventional DC roll. .

表から明らかなように、発明材は比較材に比して限界絞
り率ＬＤＲが向上している。又、各発明材を比較すれば
、Ｒｍａｘが本発明の下限値２μｍからｌＯμｍ前後の
範囲内にある場合は、Ｒｍａｘの増加につれて限界絞り
率ＬＤＲが向上するが、Ｒｍａｘが本発明の上限値２０
μｍに近づけば、限界絞り率ＬＤＲが次第に低下するこ
とが判る。なお、発明材３の如く、山の数が過度に多い
場合は、生産性が低下するので、山の数は例えば２００
個以下程度に設定することが好ましい。山の数の増加に
よって生産性が低下するのは、ロールの転写能力の限界
及び目づまり等が原因である。As is clear from the table, the limit drawing ratio LDR of the invented material is improved compared to the comparative material. Moreover, when comparing each invention material, when Rmax is within the range from the lower limit of 2 μm of the present invention to around 10 μm, the critical drawing ratio LDR improves as Rmax increases, but when Rmax is the upper limit of 20 μm of the present invention, the limit drawing ratio LDR improves as Rmax increases.
It can be seen that the limit drawing ratio LDR gradually decreases as it approaches μm. In addition, if the number of ridges is too large as in invention material 3, productivity will decrease, so the number of ridges should be set to 200, for example.
It is preferable to set the number to less than or equal to 1. The reason why the productivity decreases due to the increase in the number of ridges is due to the limit of the transfer ability of the roll and clogging.

なお、上記したような傾向は、アルミニウム合金板ばか
りでなくアルミニウム板においてら同様であった。Note that the above-mentioned tendency was the same not only for aluminum alloy plates but also for aluminum plates.

［発明の効果］ 以上説明したように、本発明では、粗面化ロールによっ
て深絞り加工用アルミニウム及びアルミニウム合金板の
表面を粗面化させることにより、深絞り加工時の限界絞
り率ＬＤＲを向上させることができ、それによって深絞
り加工性を改善することができる。従って、ポンチとダ
イスのクリアランスを少なくしたり、強度の高い素材を
使用しても、割れが発生するようなことはなくなる。[Effects of the Invention] As explained above, in the present invention, by roughening the surface of aluminum and aluminum alloy plates for deep drawing using a roughening roll, the limit drawing ratio LDR during deep drawing is improved. This can improve deep drawing workability. Therefore, even if the clearance between the punch and die is reduced or a material with high strength is used, cracks will not occur.

【図面の簡単な説明】[Brief explanation of drawings]

図面は深絞り加工用アルミニウム及びアルミニウム合金
板の表面形状を模式的に示す図である。 Ｍ・・・山。The drawings are diagrams schematically showing the surface shapes of aluminum and aluminum alloy plates for deep drawing. M...Mountain.

Claims (1)

【特許請求の範囲】[Claims] （１）表面が粗面化された圧延ロールによって圧延され
、少なくとも圧延方向と平行又は直角な方向において、
２５．４ｍｍの測定長内での最大粗さが２〜２０μｍと
なり、且つ上記２５．４ｍｍの測定長内での、高さが１
．２７μｍ以上の山の数が２５個以上となるように、上
記圧延ロールによって表面粗さが調節されたことを特徴
とする深絞り加工用アルミニウム及びアルミニウム合金
板。(1) Rolled by a rolling roll with a roughened surface, at least in a direction parallel or perpendicular to the rolling direction,
The maximum roughness within the measurement length of 25.4 mm is 2 to 20 μm, and the height within the measurement length of 25.4 mm is 1.
．． An aluminum or aluminum alloy plate for deep drawing, characterized in that the surface roughness is adjusted by the above-mentioned rolling roll so that the number of ridges of 27 μm or more is 25 or more.