JPH067948A - Manufacture of can shell - Google Patents

Abstract

PURPOSE:To manufacture a can shell having high adhesive strength of coating film at the repairing coating part and high reliability without any contamination in can-making environment and contents in the can caused by scattering of grinding powder. CONSTITUTION:A steel sheet formed by sharing so that the faced two sides become substantially parallel is deformed to a cylinder type by facing parallel two sides and the overlapped two sides are welded. Then carbon content in the steel sheet is made at <=0.20wt.% and on the surface of the steel sheet, a metallic chromium layer having <=300mg/m<2> plating weight is provided and further, chromium hydrate oxide layer having <=30mg/m<2> in term of metallic chromium content is provided thereon. Further, at least one side surface of the steel sheet is welded in the condition satisfying the inequality 0.96>=V/t.F...(1), in which V is welding speed (mpm), F is welding power source frequency (Hz) and (t) is sheet thickness (mm), so that the metallic Cr layer is precipitated in granular state and the dispersing density of the metallic Cr grains having >=10mm diameter of base part is 10<10>-10<15> pieces/m<2>.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、容器として使用される
金属缶の缶胴の溶接による製造方法に関する。より詳し
くは、缶胴がクロム（以下Ｃｒ）めっき鋼板の溶接によ
り成型される容器であって、缶内容物および製缶環境の
金属粉汚染の原因となり、かつ溶接部補修塗装で缶体に
付与される有機皮膜の密着性を阻害する要因となるよう
な、溶接のための鋼板の機械的研削あるいは化学的処理
などの溶接前処理を必要とせず、溶接部の必要十分な強
度と、優れた塗装密着性ならびに耐食性を持ち、なおか
つ生産性が高く、経済性に優れた缶体を得られる製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal can used as a container by welding a can body. More specifically, a container whose can body is formed by welding chromium (hereinafter Cr) -plated steel sheet, causes contamination of metal powder in the can contents and the can-making environment, and is applied to the can body by welding repair coating. It does not require pre-welding treatment such as mechanical grinding or chemical treatment of steel plate for welding, which is a factor that hinders the adhesiveness of the organic film to be formed. The present invention relates to a manufacturing method capable of obtaining a can body having coating adhesion and corrosion resistance, high productivity, and excellent economical efficiency.

【０００２】[0002]

【従来の技術】従来、油脂等の容器に用いられるガロン
缶は、Ｃｒめっき鋼板を用いて作られるが、Ｃｒめっき
鋼板はそのままでは、一般に用いられるマッシュシーム
型缶胴溶接機（以下「溶接機」とする）によって溶接で
きなかった。これは、「材料とプロセス」第４巻第１６
１６頁に本発明者らが述べたように、Ｃｒめっき鋼板の
表面が高電気抵抗性を示すＣｒ水和酸化物により覆われ
ているために、交流電源シーム溶接機では連続溶接が困
難であるためである。2. Description of the Related Art Conventionally, gallon cans used for containers of oils and fats are made of Cr-plated steel plates. It was not possible to weld. This is "Materials and Processes" Vol. 4, No. 16
As described by the present inventors on page 16, the surface of the Cr-plated steel sheet is covered with Cr hydrate oxide exhibiting high electrical resistance, and therefore continuous welding is difficult with an AC power source seam welding machine. This is because.

【０００３】そのため、従来Ｃｒめっき鋼板を溶接する
に際しては、溶接作業の直前に溶接該当部を研削除去す
る方法が一般的に用いられてきた。しかしこの方法によ
ると、研削粉による作業環境の悪化や、製品である缶内
部への研削粉の混入などにより、缶内容物を損う等の懸
念があった。更に、研削幅の制御上の問題などから、多
くの場合、研削後に研削部分のいわゆる耳切りにより、
鋼板の一部を切断除去しなければならなかった。これは
工程増加になる他、材料歩留りにも直接多大な悪影響を
及ぼしていた。Therefore, in the past, when welding a Cr-plated steel sheet, a method of grinding and removing the welded portion immediately before the welding operation has been generally used. However, according to this method, there is a concern that the working environment is deteriorated by the grinding powder, the contents of the can are damaged due to the mixing of the grinding powder into the product can, and the like. Furthermore, in many cases, due to problems such as control of the grinding width, so-called edge cutting of the grinding part after grinding,
A part of the steel plate had to be cut and removed. This not only increases the number of processes, but also has a great adverse effect on the material yield directly.

【０００４】また、研削された部分は、下地鉄が露出
し、あるいはさらにその下地鉄が部分的に酸化された状
態になり、その後の補修塗装における塗膜の密着性は、
Ｃｒめっき鋼板ほど良好ではなくなる。そのため、補修
塗装を行った場合にも、塗膜の剥離、塗膜下腐食などの
問題を常に内包している。また、当然ながら、補修塗装
を行わない場合には、研削部は腐食が極めて速やかに進
行する。Further, the ground iron is exposed or the ground iron is partially oxidized in the ground portion, and the adhesion of the coating film in the subsequent repair coating is
Not as good as Cr-plated steel. Therefore, even when repair coating is performed, problems such as peeling of the coating film and corrosion under the coating film are always included. Further, as a matter of course, when the repair coating is not performed, the ground portion is corroded extremely quickly.

【０００５】Ｃｒめっき鋼板に溶接性を付与させる試み
は、Ｃｒめっき層を粒状に析出させたり、Ｓｎめっき層
をＣｒめっき鋼板上に析出させる等の方法が公知であ
る。As an attempt to impart weldability to a Cr-plated steel sheet, a method of depositing a Cr-plated layer in a granular form or a Sn-plated layer on a Cr-plated steel sheet is known.

【０００６】粒状Ｃｒ層を用いる溶接性の改善方法は、
本発明者らの提案、例えば特開平３−２２９８９７号に
代表されるもので、Ｃｒめっき工程のみで成り立つ点、
即ち異種金属による別処理を必要としない点が、コスト
的に優れている。しかし、溶接電源周波数等の溶接条件
と、粒状Ｃｒ層の存在密度等材料の特性が溶接性ならび
に製品である缶体の品質に及ぼす影響については、具体
的に明らかにはされていなかった。A method of improving weldability using a granular Cr layer is as follows.
Proposed by the present inventors, for example, as represented by Japanese Patent Laid-Open No. 3-229897, the point of being established only by the Cr plating step,
That is, the cost is excellent in that no separate treatment with different metals is required. However, the effects of welding conditions such as the welding power source frequency and the material properties such as the existing density of the granular Cr layer on the weldability and the quality of the product can body have not been specifically clarified.

【０００７】またＣｒめっき上にＳｎを析出させる場合
はＣｒ水和酸化物層除去のために特殊な処理を必要とす
る上に、Ｓｎめっき層上の塗膜密着性が低下しやすい等
の操業上、品質管理上の問題があり、一般にクリア塗装
で用いられる事の多いガロン缶用途では広く用いられて
いない。When Sn is deposited on the Cr plating, a special treatment is required to remove the Cr hydrate oxide layer, and the adhesion of the coating film on the Sn plating layer is likely to deteriorate. In addition, there are problems in quality control, and it is not widely used in gallon can applications, which are often used in clear coating.

【０００８】[0008]

【発明が解決しようとする課題】本発明は、上記に述べ
た従来のＣｒめっき鋼板を用いた溶接による缶体成形方
法の問題点、具体的には研削粉の飛散による製缶環境お
よび缶内容物の汚染などの問題点を解消し、溶接補修塗
装部の塗膜密着性が高く、信頼性の高い缶体を得られる
缶胴の製造方法を提供することを目的とする。DISCLOSURE OF INVENTION Problems to be Solved by the Invention The present invention has problems of the above-described conventional method for forming a can body by welding using a Cr-plated steel sheet, more specifically, a can-making environment and can contents due to scattering of grinding powder. It is an object of the present invention to provide a method for manufacturing a can body that solves problems such as contamination of objects and has a highly adherent coating film in a weld repair coating portion and a highly reliable can body.

【０００９】[0009]

【課題を解決するための手段】本発明者らは、クロムめ
っき鋼板を材料として、缶胴を溶接で成型する缶体製造
方法について、通常行われている溶接部の事前研削によ
る溶接法の問題点を解決すべく、溶接電源周波数、溶接
ワイヤ送り速度及び材料の厚みについて鋭意研究を行っ
た結果、炭素含有量を一定範囲とした鋼板を用い、鋼板
のＣｒめっき層の粒状析出Ｃｒの大きさと密度を規定
し、かつ缶胴の溶接条件のうち溶接周波数と溶接速度即
ちマッシュシーム溶接におけるワイヤ溶接電極の送り速
度を制御することにより、健全な溶接部外観と十分な溶
接強度、並びに優れた塗膜密着性と塗装後耐食性を兼備
した缶体を得ることが出来ることを見い出し本発明を完
成するに至った。DISCLOSURE OF THE INVENTION The inventors of the present invention have proposed a method of manufacturing a can body in which a can body is formed by welding using a chrome-plated steel sheet as a material. In order to solve the problem, as a result of earnest research on welding power supply frequency, welding wire feed rate and material thickness, as a result, a steel plate with a carbon content in a certain range was used, and the size of granular precipitation Cr of the Cr plating layer of the steel plate was determined. By specifying the density and controlling the welding frequency and welding speed among the welding conditions of the can body, that is, the feed rate of the wire welding electrode in mash seam welding, a sound weld appearance and sufficient welding strength, and excellent coating strength can be obtained. They have found that a can body having both film adhesion and corrosion resistance after coating can be obtained, and completed the present invention.

【００１０】すなわち、本発明によれば、向い合う２辺
が実質平行になるように剪断成形された鋼板を、平行な
２辺を対向させて筒型に変形させ、重ね合された２辺を
溶接によって缶胴を形成する溶接缶胴の製造方法におい
て、該鋼板の炭素含有率を０．２０重量％以下とし、鋼
板表面に目付量３００ｍｇ／ｍ² 以下の金属クロム層を
設け、さらにその上に金属クロム量換算で３０ｍｇ／ｍ
² 以下のクロム水和酸化物層を設け、かつ少なくとも鋼
板の片面の該金属Ｃｒ層が粒状に析出しており、その金
属Ｃｒ粒の存在密度が、基底部径１０ｎｍ以上の金属Ｃ
ｒ粒について１０¹⁰〜10¹⁵個／ｍ² であり、溶接にあた
って溶接速度Ｖ（ｍｐｍ）、溶接電源周波数Ｆ（Ｈ
ｚ）、板厚ｔ（ｍｍ）が下式（１）を満たす条件下に、
溶接部を機械的に研削することなしに溶接することを特
徴とする缶胴の製造方法が提供され、前記の目的が達成
される。 ０．９６≧Ｖ／ｔ・Ｆ ………（１）That is, according to the present invention, a steel sheet shear-formed so that the two facing sides are substantially parallel is deformed into a tubular shape with the two parallel sides facing each other, and the two stacked sides are In a method for manufacturing a welded can body by forming a can body by welding, the carbon content of the steel sheet is 0.20% by weight or less, and a metal chromium layer having a basis weight of 300 mg / m ² or less is provided on the surface of the steel sheet. To 30 mg / m in terms of metallic chromium
^A hydrated chromium oxide layer of ² or less is provided, and at least the metal Cr layer on one side of the steel sheet is granularly deposited, and the density of the metal Cr grains is such that the metal C has a base diameter of 10 nm or more.
The number of r particles is 10 ¹⁰ to 10 ¹⁵ particles / m ² , the welding speed V (mpm) and the welding power source frequency F (H
z) and the plate thickness t (mm) satisfy the following expression (1),
There is provided a method for manufacturing a can body, which is characterized by welding the welded portion without mechanically grinding it, and achieves the above object. 0.96 ≧ V / t · F (1)

【００１１】[0011]

【作用】クロムめっき鋼板を用いて、マッシュシーム溶
接機により、ぶりきと同様の缶胴溶接を行おうとする
と、材料界面での接合が起き始める最低溶接電流の値
と、溶接部が溶融飛散して急冷される事でできる髭状突
起の溶接欠陥いわゆるスプラッシュが発生する溶接上限
電流とが極めて近接あるいは逆転し、健全な溶接部を得
ることが著しく困難であった。[Function] When chrome seamed steel sheet is used to perform can body welding similar to tinplate by using a mash seam welding machine, the minimum welding current value at which joining at the material interface begins and the welded portion is melted and scattered. It was extremely difficult to obtain a sound welded portion because the welding upper limit current at which a welding defect of a whisker-like protrusion, which is formed by rapid cooling, was generated, so-called splash, was extremely close to or reversed.

【００１２】この溶接電流最大値と最小値の差が、溶接
可能電流範囲（ＡＣＲ）であるが、Ｃｒめっき層が粒状
析していない従来のＣｒめっき鋼板ではこれが非常に小
さいかあるいは全く得られなかった。また、Ｃｒめっき
層が粒状析出しているものでは、その金属ＣｒおよびＣ
ｒ水和酸化物付着量及び粒状析出金属Ｃｒ層の数値範囲
が極めて限定されたものになっていた。The difference between the maximum value and the minimum value of the welding current is the weldable current range (ACR), which is very small or can be obtained at all in the conventional Cr-plated steel sheet in which the Cr-plated layer is not granulated. There wasn't. Further, in the case where the Cr plating layer is granularly deposited, the metal Cr and C
The numerical ranges of the amount of r-hydrated oxide deposited and the granular precipitated metal Cr layer were extremely limited.

【００１３】マッシュシーム溶接は、その溶接のための
熱源として、材料界面のジュール熱を利用しており、そ
れゆえ、材料のＡＣＲは、溶接される材料相互の界面接
触抵抗と、溶接の重ね合せ部のオーバーラップ幅の精度
によっても大きく変化する。このＡＣＲは、鋼板の製造
ロットによっても微妙に変動するため、ある材料のＡＣ
Ｒが非常に狭い場合は、溶接工程において入荷ロット毎
に溶接電流などの溶接条件を変更せねばならず、その間
は生産設備を止めなければならないため、事実上商業生
産に用いることはできない。これがＡＣＲの広い材料が
求められる所以である。Mash seam welding utilizes Joule heat at the material interface as a heat source for the weld, and therefore the ACR of the material is the interfacial contact resistance between the materials being welded and the superposition of the welds. It also varies greatly depending on the accuracy of the overlap width of the part. This ACR slightly changes depending on the manufacturing lot of steel sheet, so the AC of a certain material
If R is very narrow, the welding conditions such as welding current must be changed for each incoming lot in the welding process, and the production equipment must be stopped during that period, so that it cannot be practically used for commercial production. This is the reason why materials with a wide ACR are required.

【００１４】スプラッシュは、溶接電流による発熱が過
大になり、溶接界面近傍の材料が溶融し、その際、主に
電極加圧力等によって、溶融金属が外部に押出され、急
冷凝固する事により生成する。クロムめっき鋼板の表面
には、そのめっき反応の特性上、常に電気抵抗の高いク
ロム水和酸化物層が存在するために、ぶりき等に比べて
界面接触抵抗が高くなり、投入溶接電流当りの発熱量は
大きくなる。Splash is generated by excessive heat generation due to the welding current and melting of the material in the vicinity of the weld interface. At that time, the molten metal is extruded to the outside and rapidly solidified, mainly due to the pressure applied to the electrodes. . Due to the characteristics of the plating reaction, there is always a chromium hydrated oxide layer with high electrical resistance on the surface of the chrome-plated steel sheet, so the interfacial contact resistance is higher than that of tinplate, etc. The amount of heat generated increases.

【００１５】交流電源を用いる通常のマッシュシーム溶
接では、溶接電流が小さい状態では、個々のナゲット当
りの融着あるいは鍛接面積が小さく、図１に示すよう
に、隣接するナゲットとの間に未溶接部が残りやすい。
このような状態では巨視的に連続した溶接部は得られ
ず、当然缶体として健全な製品は得られない。In ordinary mash seam welding using an AC power source, when the welding current is small, the fusion or forged area per individual nugget is small, and as shown in FIG. 1, there is no welding between adjacent nuggets. Parts are easy to remain.
In such a state, a macroscopically continuous welded portion cannot be obtained, and naturally a sound product as a can cannot be obtained.

【００１６】また、このままのナゲットピッチで、ナゲ
ット間も連続した溶接部を得ようとして溶接電流を大き
くすると、界面の発熱は急激に大きくなり、図２に示さ
れるようにスプラッシュを発生する。この現象は、Ｃｒ
めっき層が粒状に析出している場合でも基本的には同様
であって、特に板厚みが小さい場合は、めっき層が平坦
である場合よりは溶接しやすいが、溶接可能電流範囲は
より狭まり、スプラッシュの無い缶胴を得ることは難し
かった。Further, when the welding current is increased to obtain a continuous weld between nuggets with the nugget pitch as it is, heat generation at the interface abruptly increases and a splash occurs as shown in FIG. This phenomenon is caused by Cr
It is basically the same even when the plating layer is deposited in a granular form, especially when the plate thickness is small, it is easier to weld than when the plating layer is flat, but the weldable current range is narrower, Getting a can without a splash was difficult.

【００１７】そこで、本発明では、ナゲット１個当りの
溶接熱を小さくした上で、連続した健全な溶接部を得る
ために、溶接速度をＶ（ｍｐｍ）、溶接電源周波数をＦ
（Ｈｚ）、板厚をｔ（ｍｍ）とした時、０．９６≧Ｖ／
ｔ・Ｆ、好ましくは０．７２≧Ｖ／ｔ・Ｆとすること
で、溶接部を機械的に研削することなしに缶胴を溶接す
る。Therefore, in the present invention, in order to obtain a continuous and sound welded portion while reducing the welding heat per nugget, the welding speed is V (mpm) and the welding power source frequency is F.
(Hz) and plate thickness t (mm), 0.96 ≧ V /
By setting t · F, preferably 0.72 ≧ V / t · F, the can body is welded without mechanically grinding the welded portion.

【００１８】これは、界面での発熱による重ねあわされ
た材料の融着あるいは鍛接と、材料内部の熱伝播及び電
極、雰囲気による吸熱とのバランスにより決まる数値で
あると考えられる。上記式を満たす条件下では、界面の
接触抵抗に基づく発熱による鍛接あるいは融着が十分に
生じると同時に、材料内部の熱伝導による余剰熱の拡散
吸収が十分なために、スプラッシュの発生はない。図３
に示されるように１ナゲット当りの融着長さが短い代り
に、隣接するナゲットが十分近いところにあるため、結
果的に溶接部は健全な状態で連続している。缶胴の素材
として用いられる鋼板の炭素含有率が０．２０重量％以
下であり、また鋼板表面に３００ｍｇ／ｍ² 以下の金属
クロム層を持ち、さらにその上に金属クロム量換算で３
０ｍｇ／ｍ² 以下のクロム水和酸化物層を持ち、かつ少
なとも鋼板の片面について、該金属Ｃｒ層が粒状析出し
ており、その金属Ｃｒ粒の存在密度が、基底部径１０ｎ
ｍ以上の金属Ｃｒ粒について１０¹⁰〜１０¹⁵個／ｍ² で
ある場合に、溶接周波数と溶接速度を板厚に対して上記
範囲内に入るように制御すれば、溶接部に先立つ被溶接
部分の研削などの前処理を必要とせず、溶接部のスプラ
ッシュ発生が軽微で、美麗かつ強固な溶接部を形成で
き、かつ十分な強度が得られる。It is considered that this is a numerical value determined by the balance between fusion or forge welding of superposed materials due to heat generation at the interface, and heat propagation inside the materials and heat absorption by the electrode and atmosphere. Under the conditions that satisfy the above equation, forging or fusion due to heat generation based on the contact resistance of the interface occurs sufficiently, and at the same time, the excess heat is sufficiently diffused and absorbed due to heat conduction inside the material, so that no splash occurs. Figure 3
As shown in (1), the welding length per nugget is short, but the adjacent nuggets are sufficiently close to each other, and as a result, the welded portion is continuous in a sound state. The carbon content of the steel sheet used as the material for the can body is 0.20% by weight or less, and the surface of the steel sheet has a metal chromium layer of 300 mg / m ² or less, and further has a metal chromium content of 3%.
It has a hydrated chromium oxide layer of 0 mg / m ² or less, and the metal Cr layer is granularly precipitated on at least one side of the steel sheet, and the existence density of the metal Cr grains is 10 n
In the case of 10 ¹⁰ to 10 ¹⁵ pieces / m ² of metal Cr particles of m or more, if the welding frequency and welding speed are controlled to fall within the above range with respect to the plate thickness, the welded portion preceding the welded portion No pretreatment such as grinding is required, the occurrence of splash in the weld is slight, a beautiful and strong weld can be formed, and sufficient strength can be obtained.

【００１９】[0019]

【構成】以下に、本発明の構成を詳述する。本発明は、
缶胴として向い合う２辺が実質平行になるように剪断成
形された鋼板を、平行な２辺を対向させて筒型に変形さ
せ、重ね合された２辺を溶接によって接合し、缶胴を製
造する方法である。これは従来、缶胴の溶接成型法とし
て一般的に用いられている方法であり、ここで言う筒型
成型時の断面は円形、楕円形、多角形等種々の形が含ま
れる。また、向い合う２辺が実質平行であるという事
は、溶接に先立ち筒型に成型され、溶接されるべき２辺
が向いあったときに溶接が可能な程度に平行である事を
意味する。[Structure] The structure of the present invention will be described in detail below. The present invention is
A steel plate shear-formed so that the two sides facing each other as a can body are substantially parallel is deformed into a tubular shape with the two parallel sides facing each other, and the two overlapped sides are joined by welding to form a can body. It is a manufacturing method. This is a method generally used in the past as a method of welding and forming a can body, and the cross section at the time of tubular molding referred to here includes various shapes such as a circle, an ellipse, and a polygon. Further, the fact that the two sides facing each other are substantially parallel means that the two sides, which are formed into a tubular shape prior to welding and are to be welded, are parallel to each other so that welding is possible when the two sides face each other.

【００２０】本発明の鋼板の炭素含有率を０．２０重量
％以下、好ましくは０．１重量％以下とするのは、この
領域が缶用材料として、加工性と製品の強度とのバラン
スが取りやすいからである。The carbon content of the steel sheet of the present invention is set to 0.20% by weight or less, preferably 0.1% by weight or less, because this region is used as a can material, and the balance between workability and product strength is achieved. Because it is easy to take.

【００２１】また、本発明においては、めっき鋼板原板
として、所定のクロムめっきを施すことが可能であるな
らば、例えば鋼板最表面にＮｉめっきを施した後に熱拡
散処理によりＮｉ拡散層を形成させたような表面調整原
板を用いることもできるし、同様にクロムめっき層と原
板の間に、Ｎｉ，Ｚｎ，Ｓｎ，Ｆｅ等の金属あるいはこ
れら金属の合金めっきや金属とＰ等との合金めっきを単
層あるいは複数層挿入する事もできる。本発明で鋼板表
面に３００ｍｇ／ｍ² 以下、好ましくは３０〜２００ｍ
ｇ／ｍ ² の目付量の金属Ｃｒ層を、更にその上に金属Ｃ
ｒ換算で３０ｍｇ／ｍ² 以下、好ましくは２〜２０ｍｇ
／ｍ² の付着量のＣｒ水和酸化物層を設けるのは、従来
クロムめっき鋼板製缶が用いられてきた用途について、
十分な塗膜密着性及び耐食性を得るためである。Further, in the present invention, a plated steel plate original plate
As, it is possible to apply the prescribed chrome plating.
For example, after applying Ni plating to the outermost surface of the steel sheet,
Surface conditioner as if a Ni diffusion layer had been formed by a dispersion treatment
A plate can be used, and a chromium plating layer and
Between the plates, metal such as Ni, Zn, Sn, Fe or this
The alloy plating of these metals or the alloy plating of metal and P etc.
It is also possible to insert layers or multiple layers. Steel plate table in the present invention
300 mg / m on surface²Below, preferably 30 to 200 m
g / m ²A metal Cr layer having a basis weight of
30 mg / m in r²Below, preferably 2 to 20 mg
/ M²Conventionally, a Cr hydrated oxide layer with an adhesion amount of
Regarding the applications where chrome-plated steel cans have been used,
This is to obtain sufficient coating film adhesion and corrosion resistance.

【００２２】本発明において、少なくとも鋼板の片面に
ついて金属Ｃｒが粒状に析出しており、かつ粒状析出金
属Ｃｒの存在密度が、基底部径１０ｎｍ以上の金属Ｃｒ
粒について１０¹⁰〜１０¹⁵個／ｍ² であるとするのは、
この範囲を越えると、粒状析出Ｃｒの過疎あるいは過密
によるＣｒ層の凹凸の平坦化により、粒状金属Ｃｒの効
果が失われ、それによるスプラッシュ発生抑制や、塗膜
密着性向上効果が発揮されないためである。In the present invention, metal Cr is granularly precipitated on at least one surface of the steel sheet, and the presence density of the granular precipitated metal Cr is such that the base portion diameter is 10 nm or more.
What is assumed to be 10 ¹⁰ to 10 ¹⁵ particles / m ² for a grain is
If it exceeds this range, the unevenness of the Cr layer is flattened due to the depopulation or overcrowding of the precipitated Cr and the effect of the granular metal Cr is lost, so that the effect of suppressing the generation of splash and the effect of improving the adhesion of the coating film cannot be exhibited. is there.

【００２３】このように金属Ｃｒを粒状に析出させる方
法は、それ自体公知であり、特開平３−２２９８９７号
明細書を参照することにより容易に行うことができる。Such a method of depositing metallic Cr in a granular form is known per se, and can be easily carried out by referring to Japanese Patent Laid-Open No. 3-229897.

【００２４】本発明において、溶接速度をＶ（ｍｐ
ｍ）、溶接電源周波数をＦ（Ｈｚ）、板厚をｔ（ｍｍ）
とした時、０．９６≧Ｖ／ｔ・Ｆ、好ましくは０．７２
≧Ｖ／ｔ・Ｆを満たすようにするのは、この条件下にお
いてはクロムめっき鋼板を材料として缶胴を形成する際
に、溶接部に先立つ被溶接部分の研削などの前処理を必
要とせず、溶接部のスプラッシュ発生が軽微で、美麗か
つ強固な溶接部を形成でき、かつ十分な強度が得られる
からである。これは、個々の単位ナゲット当りの投入熱
量が小さく、溶接熱影響部の広がりが最小限に抑えられ
ると同時に、ナゲット間の距離が十分接近するために、
巨視的に連続した溶接部が得られるためと考えられる。In the present invention, the welding speed is V (mp
m), welding power source frequency F (Hz), plate thickness t (mm)
Is 0.96 ≧ V / t · F, preferably 0.72
To satisfy ≧ V / t · F, under these conditions, when forming a can body using a chrome-plated steel sheet as a material, pretreatment such as grinding of the welded portion preceding the welded portion is not required. This is because the occurrence of splash in the welded portion is slight, a beautiful and strong welded portion can be formed, and sufficient strength can be obtained. This is because the input heat amount per individual unit nugget is small, the spread of the welding heat affected zone is minimized, and at the same time the distance between the nuggets is sufficiently close,
This is probably because a welded portion that is macroscopically continuous can be obtained.

【００２５】しかしながら、溶接電源周波数を極端に上
げると、溶接回路のインダクタンスに由来する実効電流
値の低下が起き、エネルギーロスが大きくなる。また、
電源装置も高価になる。またナゲットピッチが狭すぎる
と、先行ナゲットへの溶接電流のまわりこみが起きて、
スプラッシュを発生しやすくなる。これらの観点から溶
接条件をＶ／ｔ・Ｆ≧０．０１の範囲に設定することが
好ましい。However, if the welding power source frequency is extremely increased, the effective current value is lowered due to the inductance of the welding circuit, and the energy loss increases. Also,
The power supply also becomes expensive. Also, if the nugget pitch is too narrow, the welding current will sneak into the preceding nugget,
Splash is likely to occur. From these viewpoints, it is preferable to set the welding conditions within the range of V / t · F ≧ 0.01.

【００２６】本発明における材料としてのクロムめっき
鋼板は、その缶体としての用途に合致した性能を満たす
ものであれば、Ｃｒめっき層と下地鋼板層の間に、Ｃｒ
以外の各種金属あるいは非金属元素の単体、複層、合
金、分散めっき層や、それらと下地鉄あるいは表層Ｃｒ
層との拡散層が形成されていてもかまわない。また本発
明の最表層Ｃｒめっき層のさらに上層への被覆について
は、直接溶接が行われない部分であれば、どのような表
面処理が行われていても構わない。また、ここで溶接部
以外は、塗装されていても、未塗装状態でもかまわな
い。塗料の性質、塗装あるいは被覆の手段はどのような
種類のものでもよい。As long as the chromium-plated steel sheet as the material in the present invention satisfies the performance suitable for the use as the can body, the Cr-plated steel sheet is provided between the Cr-plated layer and the base steel sheet layer.
Other than simple metals or non-metal elements other than simple substance, multiple layers, alloys, dispersion plating layers, and those and underlying iron or surface Cr
A diffusion layer with the layer may be formed. As for the coating of the uppermost Cr plating layer of the present invention to a further upper layer, any surface treatment may be performed as long as it is a portion where direct welding is not performed. Further, here, the portions other than the welded portion may be painted or unpainted. The nature of the paint and the means of painting or coating may be of any kind.

【００２７】[0027]

【実施例】以下に、本発明を実施例に基づいて、さらに
具体的に説明する。缶胴の製造法 板厚０．１４〜０．３２ｍｍ、炭素含有率０．００２〜
０．２５重量％のアルミキルド冷延鋼板に、種々の付着
量の金属クロム水和酸化クロムをめっきし、缶内面相当
部にエポキシフェノール系樹脂を、缶外面相当部分にエ
ポキシエステル系樹脂を各６０ｍｇ／ｍ² 被覆したクロ
ムめっき鋼板を用い、種々の溶接条件により、缶胴をス
ードロニック社製のワイヤーシーム溶接機を用いて溶接
成型した。表１に使用した鋼板及び溶接条件を示す。EXAMPLES The present invention will be described more specifically below based on examples. Can body manufacturing method Plate thickness 0.14 to 0.32 mm, carbon content 0.002
A 0.25 wt% cold-rolled aluminum-killed steel plate is plated with various amounts of metal chromium hydrated chromium oxide, and an epoxy phenolic resin is applied to the inner surface of the can and an epoxy ester resin is applied to the outer surface of the can at 60 mg each. / M ² coated chrome-plated steel sheet, and under various welding conditions, the can body was welded and formed using a wire seam welder manufactured by Sudronic. Table 1 shows the steel plates used and the welding conditions.

【００２８】[0028]

【表１】 [Table 1]

【００２９】評価方法 上記の缶体について、以下の方法で評価を行った。 溶接可能電流範囲：種々の溶接電流値において、溶接部
のスプラッシュ発生、ピール（ハイン）テストによる溶
接部強度判定、および溶接缶胴のフランジ成型時の溶接
部近傍のクラック発生の有無の目視判定を総合し、溶接
可能電流範囲（ＡＣＲ）を求め、その中央値の溶接電流
絶対値に対するＡＣＲの比率を求め、３％以上を可
（◎）、３％未満を不可（×）とした。 缶内金属粉汚染：溶接終了後の缶胴内の溶接部中央部の
左右４ｃｍに渡って、幅１５ｍｍのセロファンテープを
貼り、ただちに剥がした後、０．１Ｎ ＨＣｌ ５０ｃ
ｃ中に入れて、１０分間煮沸し、原子吸光分析により、
浸出液中のＦｅ，Ｃｒを測定した。測定限界以上のＦ
ｅ，Ｃｒが検出されたら×、検出されなければ◎と評価
した。 スプラッシュ発生：目視により、溶接可能電流範囲の中
央値での溶接時に、缶内面及び外面に発生したスプラッ
シュを判定した。 ◎ スプラッシュ発生なし ○ 補修塗装で被覆可能、密封性及び強度は問題なし × 補修塗装で被覆不可能 塩水噴霧試験：５％ＮａＣｌ水溶液を用い、塩水噴霧試
験機で溶接補修塗装部に塩水を２０日間噴霧した後、赤
錆発生面積を計測し、参考例の数値に対して±２０％以
内を○、２０％を越えるものを×、−２０％より少ない
ものを◎とした。以上の結果を表２に示す。これらの結
果より、本発明の方法により所期の目的が達成されるこ
とは明らかである。 Evaluation Method The above cans were evaluated by the following methods. Weldable current range: At various welding current values, weld splash occurs, weld strength is judged by peel (hine) test, and visual check is made for cracks in the vicinity of the weld during flange forming of the welding can body. Overall, the weldable current range (ACR) was determined, the ratio of the ACR to the welding current absolute value of the median was determined, and 3% or more was acceptable (⊚) and less than 3% was not acceptable (x). Contamination of metal powder in cans: Cellophane tape with a width of 15 mm was applied to the left and right 4 cm of the center of the welded part in the body of the can after welding, and immediately peeled off, then 0.1 N HCl 50c
Put in c, boil for 10 minutes, by atomic absorption analysis,
Fe and Cr in the leachate were measured. F above the measurement limit
When e and Cr were detected, it was evaluated as ×, and when not detected, it was evaluated as ⊚. Splash generation: Splash generated on the inner surface and outer surface of the can during the welding at the median value of the weldable current range was visually determined. ◎ No splash occurs ○ Cover can be coated with repair coating, sealing and strength are not problematic × Cover cannot be coated with repair coating Salt spray test: 5% NaCl solution is used and salt water is applied to the weld repair coating section with a salt spray tester for 20 days After spraying, the area where the red rust occurred was measured, and within ± 20% of the numerical value of the reference example, ◯, over 20% were marked x, and less than -20% were marked ⊚. The above results are shown in Table 2. From these results, it is clear that the method of the present invention achieves the intended purpose.

【００３０】 [0030]

【００３１】[0031]

【発明の効果】本発明の方法により、研削粉の飛散によ
る製缶環境および缶内容物の汚染が無く、溶接補修塗装
部の塗膜密着性が高く、信頼性の高い缶胴を製造するこ
とができる。EFFECTS OF THE INVENTION According to the method of the present invention, it is possible to produce a highly reliable can body which has no contamination of the can making environment and the contents of the can due to the scattering of grinding powder, has a high adhesion of the coating film on the welding repair coating part, and is highly reliable. You can

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

【図１】 従来のＣｒめっき鋼板溶接における溶接強度
不足の場合の溶接部縦断面の模式図である。FIG. 1 is a schematic view of a longitudinal cross section of a welded portion in the case of insufficient welding strength in conventional Cr-plated steel plate welding.

【図２】 従来の溶接におけるスプラッシュが発生する
場合の溶接部縦断面の模式図である。FIG. 2 is a schematic diagram of a vertical cross section of a welded portion when a splash occurs in conventional welding.

【図３】 本発明における、Ｃｒめっき鋼板の適正な溶
接の場合の溶接部縦断面の模式図である。FIG. 3 is a schematic view of a longitudinal cross section of a welded portion in the case of proper welding of a Cr-plated steel sheet according to the present invention.

【符号の説明】[Explanation of symbols]

１ 外側の鋼板 ２ 内側の鋼板 ３ 融着部、鍛接部または溶接熱影響部 ４ スプラッシュ ５ ブローホール 1 Outer Steel Plate 2 Inner Steel Plate 3 Fused, Forged or Weld Heat Affected Zone 4 Splash 5 Blowhole

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成５年４月１６日[Submission date] April 16, 1993

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００２７[Name of item to be corrected] 0027

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００２７】[0027]

【実施例】以下に、本発明を実施例に基づいて、さらに
具体的に説明する。缶胴の製造法 板厚０．１４〜０．３２ｍｍ、炭素含有率０．００２〜
０．２５重量％のアルミキルド冷延鋼板に、種々の付着
量の金属クロム水和酸化クロムをめっきし、缶内面相当
部にエポキシフェノール系樹脂を、缶外面相当部分にエ
ポキシエステル系樹脂を各６０ｍｇ／ｄｍ^２ 被覆したク
ロムめっき鋼板を用い、種々の溶接条件により、缶胴を
スードロニック社製のワイヤーシーム溶接機を用いて溶
接成型した。表１に使用した鋼板及び溶接条件を示す。EXAMPLES The present invention will be described more specifically below based on examples. Can body manufacturing method Plate thickness 0.14 to 0.32 mm, carbon content 0.002
A 0.25 wt% cold-rolled aluminum-killed steel sheet was plated with various amounts of chromium chromium hydrate oxide, and an epoxy phenolic resin was applied to the inner surface of the can and an epoxy ester resin was applied to the outer surface of the can. Using a chrome-plated steel sheet coated with mg / dm ² and under various welding conditions, the can body was weld-molded using a wire seam welder manufactured by Sudronic. Table 1 shows the steel plates used and the welding conditions.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 緒 方 一 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 森 戸 延 行 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 久々湊 英 雄 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 近 藤 一 郎 兵庫県伊丹市荒牧字下鍵田10番地 川鉄コ ンテイナー株式会社伊丹工場内 (72)発明者 三 浦 真 也 千葉県千葉市中央区新浜町１番地 川鉄コ ンテイナー株式会社千葉工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hajime Ogata, 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Technical Research Division, Kawasaki Steel Co., Ltd. (72) Nobuyuki Morito, Kawasaki, Chuo-ku, Chiba, Chiba Town No. 1 Kawasaki Steel Co., Ltd. Technical Research Division (72) Inventor Hideo Kuminato No. 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Co., Ltd. Chiba Works (72) Inventor Ichiro Kondo Itami Hyogo Prefecture City Aramaki 10 Shimogita, Itami Plant, Kawatetsu Container Co., Ltd. (72) Inventor Shinya Miura, 1 Niihamacho, Chuo-ku, Chiba City, Chiba Kawatetsu Container Co., Ltd., Chiba Plant

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】向い合う２辺が実質平行になるように剪断
成形された鋼板を、平行な２辺を対向させて筒型に変形
させ、重ね合された２辺を溶接することによって缶胴を
形成する溶接缶胴の製造方法において、該鋼板の炭素含
有率を０．２０重量％以下とし、鋼板表面に目付量３０
０ｍｇ／ｍ² 以下の金属クロム層を設け、さらにその上
に金属クロム量換算で３０ｍｇ／ｍ² 以下のクロム水和
酸化物層を設け、かつ少なくとも鋼板の片面の該金属Ｃ
ｒ層が粒状に析出しており、その金属Ｃｒ粒の存在密度
が、基底部径１０ｎｍ以上の金属Ｃｒ粒について１０¹⁰
〜10¹⁵個／ｍ²であり、溶接にあたって、溶接速度Ｖ
（ｍｐｍ）、溶接電源周波数Ｆ（Ｈｚ）、板厚ｔ（ｍ
ｍ）が下式（１）を満たす条件下に、溶接部を機械的に
研削することなしに溶接することを特徴とする缶胴の製
造方法。 ０．９６≧Ｖ／ｔ・Ｆ ………（１）1. A can body by shearing-formed steel sheets so that two facing sides are substantially parallel to each other, the two parallel sides are made to face each other and deformed into a tubular shape, and the two overlapped sides are welded. In the method for manufacturing a welding can body for forming a steel sheet, the carbon content of the steel sheet is 0.20% by weight or less, and the basis weight of the steel sheet is 30%.
A metal chrome layer of 0 mg / m ² or less is provided, and a hydrated chromium oxide layer of 30 mg / m ² or less in terms of the amount of metal chromium is further provided on the metal chrome layer, and the metal C on at least one side of the steel plate is provided.
The r layer is precipitated in a granular form, and the density of existing metal Cr particles is 10 ¹⁰ for metal Cr particles having a base diameter of 10 nm or more.
~ 10 ¹⁵ pieces / m ² and welding speed V
(Mpm), welding power supply frequency F (Hz), plate thickness t (m
A method for producing a can body, characterized in that welding is performed without mechanically grinding the welded portion under the condition that m) satisfies the following expression (1). 0.96 ≧ V / t · F (1)