JP2862949B2 - Manufacturing method of aluminum plate for fin - Google Patents
Manufacturing method of aluminum plate for finInfo
- Publication number
- JP2862949B2 JP2862949B2 JP10272690A JP10272690A JP2862949B2 JP 2862949 B2 JP2862949 B2 JP 2862949B2 JP 10272690 A JP10272690 A JP 10272690A JP 10272690 A JP10272690 A JP 10272690A JP 2862949 B2 JP2862949 B2 JP 2862949B2
- Authority
- JP
- Japan
- Prior art keywords
- fin
- aluminum plate
- plate
- effect
- fins
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は張り出し加工,しごき加工,絞り加工を施し
てから使用される成形加工性に優れたフィン用アルミニ
ウム板の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing an aluminum plate for fins which is used after being subjected to overhanging, ironing and drawing, and which has excellent formability.
Al及びAl合金は従来から優れた成形用材料として広く
使用され、成形用材料としてのフィン用材料はフィン成
形性に優れることが要求される。成形性に影響する因子
としては、材料の合金成分、金属組織などに依存する物
理的もしくは機械的特性値と成形時に使用される潤滑剤
(潤滑油)の成分、添加剤、粘度などが従来知られてい
る。さらに材料表面の微視的レベルでの形状は成形時の
潤滑剤保持性(材料表面への潤滑剤の浸透性)に関係
し、従って成形性に影響する要因としても位置づけられ
ている。Conventionally, Al and Al alloys have been widely used as excellent molding materials, and fin materials as molding materials are required to have excellent fin moldability. Conventionally known factors affecting the formability include the alloy component of the material, physical or mechanical property values that depend on the metal structure, etc., and the components of the lubricant (lubricating oil), additives, and viscosity used during molding. Have been. Further, the shape of the material surface at the microscopic level is related to the lubricant retention during molding (the permeability of the lubricant to the material surface), and is therefore positioned as a factor affecting the moldability.
一方、成形用板材の表面は圧延に使用するロールの表
面形状が転写されるため、ロール表面の微視形状制御が
成形性に優れた材料を製造するにあたって重要であると
されている。ロールの表面形状は通常、圧延ロール表面
を砥石を用いて仕上げ加工し、砥石表面の粗さならびに
砥石の送り速度、ロールの回転速度などの研磨条件によ
って仕上げ状態が異なる。従来成形用板材の表面はJIS
で規定されている表面粗度で表示するとRa0.2〜0.4μm
を有している。潤滑剤の保持性についてはRaをある程度
大きくした方が良いとする考え方もあるが定説はない。
それゆえ、フィン成形されるフィン用材料の成形性向上
は、主に金属組織制御により図られているのが現状であ
る。On the other hand, since the surface shape of the roll used for rolling is transferred to the surface of the forming plate material, it is considered that control of the microscopic shape of the roll surface is important in producing a material having excellent formability. The surface shape of the roll is usually finished by finishing the surface of the rolling roll with a grindstone, and the finished state varies depending on the polishing conditions such as the roughness of the grindstone surface, the feed speed of the grindstone, and the rotation speed of the roll. Conventional molding plate surface is JIS
Ra 0.2-0.4μm when expressed in terms of surface roughness specified in
have. There is a view that it is better to increase Ra to some extent for the retention of lubricant, but there is no established theory.
Therefore, at present, the improvement of the formability of the fin material to be formed into a fin is mainly achieved by controlling the metallographic structure.
従って、従来フィン用アルミニウム板は、フィンの形
状及び用途に応じて同一合金材料でも金属組織、組成を
微妙に制御して使い分けているのが現状であり、広い用
途に適用できる材料は少なかった。しかし、加工技術の
進歩とともに材料に要求される品質水準も年々高くな
り、成形性の向上が強く要望されているのが現状である
が、従来技術によるのみでは飛躍的な改善は望めなかっ
た。例えばドローレス方式フィンは第1図(イ)〜
(ニ)に示すようにフィン(1)に熱交チューブを挿着
するカラー部(2)を形成したもので、打ち抜き、穴拡
げ(イ)、バーリング(ロ)、アイアニング(ハ)、リ
フレアー(ニ)の工程からなり、しごき成形が中心をな
しているが、その形成時に生じる成形不良としては、ア
イアニング工程で発生するしごき割れ、リフレアー工程
で発生する花割れ等があり、これらは何れらもカラー部
と熱交チューブの密着性を損ない、熱交特性を低下させ
ると共に成形フィンの外観を害するものであるため、製
品としての価値を下げる場合がある。これらの成形不良
は素材の材質、機械的強度に影響されるが、機械的強度
が適性であっても発生する事があり、又、その発生も素
材全体にわたるものではなく、多くの場合は局部的に集
中したり、点在したりするものであり品質の安定化が望
まれている。Therefore, at present, conventional aluminum plates for fins use the same alloy material, depending on the shape and use of the fin, with delicate control of the metallographic structure and composition, and there are few materials applicable to a wide range of uses. However, with the progress of processing technology, the quality level required for the material has been increasing year by year, and at present, there is a strong demand for improvement in formability. However, a dramatic improvement cannot be expected only with the conventional technology. For example, drawless type fins are shown in Figs.
As shown in (d), a collar portion (2) for inserting a heat exchange tube into a fin (1) is formed, and punching, hole expansion (a), burring (b), ironing (c), and flaring ( D) The ironing process is the center of the process, and the molding defects that occur during the forming process include ironing cracks occurring in the ironing process and flower cracks occurring in the refraining process. Since the adhesiveness between the collar portion and the heat exchange tube is impaired, the heat exchange characteristics are reduced, and the appearance of the formed fin is impaired, the value as a product may be reduced. These molding failures are affected by the material and mechanical strength of the material, but may occur even if the mechanical strength is appropriate, and the occurrence is not limited to the entire material and is often localized. It is concentrated and scattered, and stabilization of quality is desired.
本発明の目的は上記のような従来技術の問題点に鑑
み、しごき加工、伸びフランジ加工を施して用いられる
アルミフィンにおいて成形加工時に発生する割れを解消
し、品質の安定化が図れるような成形加工性に優れたフ
ィン用アルミニウム板の製造方法を開発したものであ
る。SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, an object of the present invention is to form an aluminum fin that has been subjected to ironing and stretch flange processing so as to eliminate cracks generated during forming and to stabilize quality. A method for producing an aluminum plate for fins having excellent workability has been developed.
即ち、本発明者等は種々検討の結果、従来の砥石研磨
により仕上げ加工されたロールで圧延された板では圧延
方向に沿ってロール目が転写されるために、圧延方向と
その直角方向とで表面の微視形状の現れかたが異なり、
例えば山あるいは谷となる部分が圧延方向に沿って周期
的に現れるため、方向性をもった表面形状となり、フィ
ン加工時の潤滑性が部位によって微妙に変わることがわ
かった。この知見をもとに成形加工前のアルミニウム板
表面をアルカリ溶液を用いてエッチングし、方向性を少
なくするとともに圧延板表面に特定サイズのピット(窪
み)を生成させた合金板を製造し、成形したところ圧延
板表面の窪みが潤滑油溜まりとして作用し、かつ、表面
形状の方向性も少ないために従来材と比較して成形性が
著しく優れた材料が得られることを見出した。本発明は
これらの知見に基づいて開発されたものである。That is, as a result of various studies, the present inventors have determined that, in a plate rolled with rolls finished by conventional grinding stone polishing, the rolls are transferred along the rolling direction, so that the rolling direction and the direction perpendicular to the rolling direction. The appearance of the microscopic shape of the surface is different,
For example, since the peaks or valleys appear periodically along the rolling direction, the surface has a directional surface shape, and it has been found that the lubricity during fin processing varies slightly depending on the part. Based on this knowledge, the surface of the aluminum plate before forming was etched with an alkaline solution to produce an alloy plate with reduced directional properties and pits (dents) of a specific size on the surface of the rolled plate. As a result, it has been found that a dent on the surface of the rolled plate acts as a lubricating oil reservoir and that the surface shape is less directional, so that a material having significantly better formability than the conventional material can be obtained. The present invention has been developed based on these findings.
即ち本発明は、フィン用アルミニウム板の製造工程に
おいて、最終冷間圧延後にAl又はAl合金圧延板の片面又
は両面を、pH10以上のアルカリ溶液にて1〜900秒洗浄
することにより、成形加工前のアルミニウム板の表面に
径が0.1〜200μm、深さが0.1〜5μmの窪みを平均中
心間隔が1〜1000μmで形成したことを特徴とするもの
である。That is, the present invention, in the manufacturing process of the aluminum plate for fins, by washing one or both sides of the Al or Al alloy rolled plate after the final cold rolling with an alkaline solution having a pH of 10 or more for 1 to 900 seconds, before forming processing A depression having a diameter of 0.1 to 200 [mu] m and a depth of 0.1 to 5 [mu] m at an average center interval of 1 to 1000 [mu] m.
(作 用) 本発明において表面に配列する窪みの径を0.1〜200μ
mとするのは、径が0.1μm未満では潤滑油の油溜まり
効果がなく成形性向上に寄与しないためであり、径が20
0μmを越えると潤滑油が板表面に保持されにくくなり
潤滑効果を低減し、かえって成形性を損なうため好まし
くないためである。(Operation) In the present invention, the diameter of the depressions arranged on the surface is 0.1 to 200 μm.
When the diameter is less than 0.1 μm, the lubricating oil does not have an oil collecting effect and does not contribute to the improvement of moldability.
If the thickness exceeds 0 μm, the lubricating oil is difficult to be retained on the plate surface, and the lubricating effect is reduced, and the moldability is rather deteriorated.
窪みの深さを0.1〜5μmとするのは、深さが0.1μm
未満では潤滑油の保持効果がなく成形性改善に寄与しな
いためであり、深さが5μmを越えるとフィン成形加工
中にかえって応力集中源となり、成形割れを生じるため
好ましくないためである。When the depth of the depression is 0.1 to 5 μm, the depth is 0.1 μm.
If the depth is less than 5 μm, the lubricating oil has no retaining effect and does not contribute to the improvement of the formability. If the depth exceeds 5 μm, it becomes a source of stress concentration during the fin forming process and forms cracks.
隣接する窪み同士の平均中心間隔を1〜1000μmとす
るのは、これらの中心間隔が1μm未満では成形性向上
効果が見られず、中心間隔が1000μmを越えると潤滑材
保持効果が低減し、成形性向上効果はみられないためで
ある。The reason that the average center distance between adjacent dents is 1 to 1000 μm is that when these center distances are less than 1 μm, the effect of improving the formability is not seen, and when the center distance exceeds 1000 μm, the lubricant holding effect is reduced, and This is because the effect of improving the properties is not seen.
本発明において、洗浄とはアルミ表面にピット(窪
み)を生成するようなエッチング性の洗浄を意味し酸
系、アルカリ系でも十分効果を有するが、好ましくはpH
10以上のアルカリ溶液にて洗浄すれば効果が高い。洗浄
時間は1秒以上であれば上記の窪み形状,分布が得られ
るが、好ましくは10秒以上洗浄を施せば安定して所定サ
イズの窪みが得られ更に効果が高い。ここでpH10未満ま
たは洗浄時間1秒未満では所定サイズの窪みが得られ
ず、十分な成形性向上効果が得られない。また洗浄時間
が900秒を越えるのは生産性の面から好ましくないばか
りか、過度の洗浄により表面のAl−Fe系,Al−Mn系等の
金属間化合物を起点とした粗大なピットの生成、あるい
は金属間化合物の抜け落ちを生じる結果、成形加工性が
劣化する為好ましくない。In the present invention, the term “cleaning” refers to etching-type cleaning that generates pits (dents) on the aluminum surface, and has a sufficient effect even in an acid system or an alkali system.
Washing with 10 or more alkaline solutions is highly effective. If the washing time is 1 second or more, the above-mentioned dent shape and distribution can be obtained. However, if washing is performed for 10 seconds or more, a dent of a predetermined size can be obtained stably, and the effect is further enhanced. Here, if the pH is less than 10 or the washing time is less than 1 second, a depression of a predetermined size cannot be obtained, and a sufficient effect of improving moldability cannot be obtained. In addition, the cleaning time exceeding 900 seconds is not only undesirable from the viewpoint of productivity, and the generation of coarse pits starting from an intermetallic compound such as an Al-Fe-based or Al-Mn-based surface due to excessive cleaning, Alternatively, it is not preferable because the moldability is deteriorated as a result of dropout of the intermetallic compound.
冷間圧延途中に上記の洗浄を行い窪みを生成させた
後、引き続き冷間圧延を行うことによっても最終冷延板
表面に上記の窪みを形成されることもできるが、好まし
くは最終冷間圧延後に洗浄を行えば所定形状、分布の窪
みが得られるため、更に効果が高い。After the above-described washing is performed during the cold rolling to generate the pits, the pits can be formed on the surface of the final cold-rolled sheet by further performing the cold rolling, but the final cold rolling is preferably performed. If cleaning is performed later, a depression having a predetermined shape and distribution can be obtained, so that the effect is higher.
次に本発明を実施例に基づき更に詳細に説明する。 Next, the present invention will be described in more detail based on examples.
JISA1050アルミニウム合金を使用しドローレスフィン
用薄板を製造する工程において、冷間圧延終了後にアル
カリ系洗浄液でAl合金板表面を洗浄し、第1表に示す材
料を作成した。次いでこれらの薄板に仕上げ焼鈍を施し
た後、ドローレスフィン実機によりフィン成形を行い割
れ発生状況を調べた。しごき割れの発生が激しいものを
×、軽度のものを△、全く発生しないものを○と判定し
た。この結果を第2表に示す。In the process of manufacturing a drawless fin thin plate using a JISA1050 aluminum alloy, the surface of the Al alloy plate was washed with an alkaline cleaning solution after the completion of cold rolling to produce the materials shown in Table 1. Next, these thin plates were subjected to finish annealing, and then fins were formed using an actual drawless fin machine to examine the occurrence of cracks. A sample with severe occurrence of ironing cracks was judged as x, a sample with mild cracking was evaluated as Δ, and a sample with no occurrence was evaluated as ○. Table 2 shows the results.
第1表及び第2表から明らかなように、アルカリエッ
チングを施してAl合金板表面に径が0.1〜200μm、深さ
が0.1〜5μmの窪みを平均中心間隔が1〜1000μmで
形成したフィン用アルミニウム合金板は従来工程の材料
に比べてしごき割れが発生しにくくなっている。また洗
浄が十分でなく所定の窪み形状、分布が得られていない
場合は成形性向上効果が十分でない。また過度に洗浄を
行ったものはかえって成形割れを生じやすくなっている
ことが分かる。 As is clear from Tables 1 and 2, for fins having a diameter of 0.1 to 200 [mu] m and a depth of 0.1 to 5 [mu] m formed on the surface of the Al alloy plate by alkali etching and having an average center interval of 1 to 1000 [mu] m. The aluminum alloy plate is less likely to cause ironing cracks than the material used in the conventional process. Further, when the cleaning is not sufficient and the predetermined dent shape and distribution are not obtained, the effect of improving the formability is not sufficient. In addition, it can be seen that the mold which has been excessively washed is liable to form cracks.
このように本発明によれば、フィン用アルミニウム板
について著しい表面性状の安定化が図れるため、フィン
成形性を向上し、不良率を著しく低減し得る顕著な効果
を奏するものである。As described above, according to the present invention, remarkable stabilization of the surface properties of the aluminum plate for fins can be achieved, so that there is a remarkable effect that the fin formability is improved and the defective rate can be significantly reduced.
第1図(イ)〜(ニ)はドローレス方式の加工工程に示
す説明図、(イ)は打ち抜き,穴拡げ、(ロ)バーリン
グ、(ハ)アイアニング、(ニ)リフレアを示す。FIGS. 1 (a) to 1 (d) are explanatory views showing a draw-less type processing step, and FIG. 1 (a) shows punching, hole expansion, (b) burring, (c) ironing, and (d) refrea.
フロントページの続き (58)調査した分野(Int.Cl.6,DB名) C23G 1/22 C23F 1/36 C22F 1/04 F28F 1/32Continuation of the front page (58) Field surveyed (Int.Cl. 6 , DB name) C23G 1/22 C23F 1/36 C22F 1/04 F28F 1/32
Claims (1)
て、最終冷間圧延後にAl又はAl合金圧延板の片面又は両
面を、pH10以上のアルカリ溶液にて1〜900秒洗浄する
ことにより、成形加工前のアルミニウム板の表面に径が
0.1〜200μm、深さが0.1〜5μmの窪みを平均中心間
隔が1〜1000μmで形成したことを特徴とするフィン用
アルミニウム板の製造方法。In a manufacturing process of an aluminum plate for a fin, one or both sides of a rolled Al or Al alloy plate are washed with an alkaline solution having a pH of 10 or more for 1 to 900 seconds after final cold rolling, so that the aluminum plate is formed before forming. The diameter of the surface of the aluminum plate
A method for producing an aluminum plate for fins, wherein a depression having a depth of 0.1 to 200 μm and a depth of 0.1 to 5 μm is formed with an average center interval of 1 to 1000 μm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10272690A JP2862949B2 (en) | 1990-04-18 | 1990-04-18 | Manufacturing method of aluminum plate for fin |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10272690A JP2862949B2 (en) | 1990-04-18 | 1990-04-18 | Manufacturing method of aluminum plate for fin |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH043891A JPH043891A (en) | 1992-01-08 |
JP2862949B2 true JP2862949B2 (en) | 1999-03-03 |
Family
ID=14335269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10272690A Expired - Lifetime JP2862949B2 (en) | 1990-04-18 | 1990-04-18 | Manufacturing method of aluminum plate for fin |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2862949B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103600274A (en) * | 2013-12-05 | 2014-02-26 | 徐四伟 | Radiating fin surface treatment process |
-
1990
- 1990-04-18 JP JP10272690A patent/JP2862949B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH043891A (en) | 1992-01-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5799527A (en) | Method of producing a stainless steel sheet having excellent surface brightness | |
JP2862949B2 (en) | Manufacturing method of aluminum plate for fin | |
JPS6149701A (en) | Cold rolling method of thin stainless-steel sheet with less surface defect and excellent resistance to corrosion | |
JPH0853732A (en) | Aluminum alloy sheet for automobile body sheet, its production and its forming method | |
JP3476495B2 (en) | Sheet steel for press working | |
JP6266905B2 (en) | Aluminum alloy plate for can body and manufacturing method thereof | |
JP2862950B2 (en) | Aluminum sheet for drawless fin and method for producing the same | |
JP3219311B2 (en) | Method for producing aluminum alloy plate excellent in galling resistance and black streak resistance | |
JP3274295B2 (en) | Method for producing stainless steel foil with excellent anti-glare properties | |
JPS6336907A (en) | Aluminum or aluminum alloy sheet having excellent elongation flanging workability | |
JP2982132B2 (en) | Method for producing highly formable aluminum and aluminum alloy sheets for heat exchanger | |
JP2931137B2 (en) | Manufacturing method of aluminum alloy sheet for drawless fins with excellent ironing workability | |
JP3313574B2 (en) | Method for preventing occurrence of non-plating in hot dip galvanizing manufacturing process | |
JPH1157811A (en) | Production of lustrous cold rolled stainless steel sheet | |
JP3384507B2 (en) | Processing method of mirror material with micro holes | |
JPH08229602A (en) | Titanium plate excellent in antidazzle characteristics and manufacture thereof | |
JP2992216B2 (en) | Manufacturing method of high gloss stainless steel strip | |
JP3415924B2 (en) | Manufacturing method of high gloss stainless steel sheet | |
JPH0432588A (en) | Production of aluminum alloy sheet for can body | |
JPH067802A (en) | Steel sheet and metallic strip of high press formability | |
JPH06312202A (en) | Manufacture of hot rolled strip | |
JP3230115B2 (en) | Stainless steel plate with excellent anti-glare properties | |
JPS5947608B2 (en) | Temper rolling roll of plated steel plate | |
JP3860968B2 (en) | Aluminum alloy plate for embossing and aluminum alloy coated plate for embossing | |
JP2748815B2 (en) | Stainless steel cold rolled steel strip excellent in press formability and method for producing the same |