JPH09193286A - Pre-coated steel sheet with excellent drawability - Google Patents
Pre-coated steel sheet with excellent drawabilityInfo
- Publication number
- JPH09193286A JPH09193286A JP2480896A JP2480896A JPH09193286A JP H09193286 A JPH09193286 A JP H09193286A JP 2480896 A JP2480896 A JP 2480896A JP 2480896 A JP2480896 A JP 2480896A JP H09193286 A JPH09193286 A JP H09193286A
- Authority
- JP
- Japan
- Prior art keywords
- coating film
- steel sheet
- resin coating
- elongation
- tensile
- 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.)
- Pending
Links
Landscapes
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
(57)【要約】
【課題】 絞り加工部に使用した場合に塗膜剥離や塗膜
割れ等が発生せず、外観良好な絞り成形性に優れたプレ
コート鋼板を提供する。
【解決手段】 鋼板に、引張試験で弾性比例限界を有
し、かつ２０〜３００ｋｇ／ｍｍ2 の引張弾性率を有す
る樹脂塗膜を被覆したことを特徴とする絞り成形性に優
れたプレコート鋼板である。前記樹脂塗膜は、更に弾性
限界伸びが１５％以下であること、また、引張試験で降
伏点伸びを有することが好ましい。(57) [Summary] [PROBLEMS] To provide a pre-coated steel sheet having excellent appearance and excellent draw formability without causing peeling of a coating film, cracking of a coating film or the like when used in a drawn portion. A precoated steel sheet having excellent draw formability, characterized in that the steel sheet is coated with a resin coating film having an elastic proportional limit in a tensile test and a tensile elastic modulus of 20 to 300 kg / mm 2. is there. It is preferable that the resin coating film further has an elastic limit elongation of 15% or less and has a yield point elongation in a tensile test.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、家電製品、家具、
建材および自動車部品などの外板で絞り加工を行うこと
で製品を成形する部位に用いる絞り成形性に優れたプレ
コート鋼板に関する。The present invention relates to home appliances, furniture,
The present invention relates to a precoated steel sheet having excellent draw formability that is used in a part where a product is formed by drawing an outer plate such as a building material or an automobile part.
【０００２】[0002]
【従来の技術】家電製品、家具、建材および自動車部品
などの外板としてプレコート鋼板を用いる場合は、従
来、加工を行わない平板部や曲げ加工等の単純な加工部
にのみ使用し、絞り成形部には冷延鋼板またはめっき鋼
板を成形加工後塗装するポストコートを行っていた。し
かし、近年になり、プレコート鋼板の普及率の増加に伴
い、絞り加工部へもプレコート鋼板が使用されるように
なっている。2. Description of the Related Art Conventionally, when a precoated steel sheet is used as an outer panel for home electric appliances, furniture, building materials, automobile parts, etc., it is conventionally used only for a flat plate portion that has not been processed or for a simple processing portion such as bending, and drawing forming Post-coating was performed on the parts by painting cold-rolled steel sheets or plated steel sheets after forming. However, in recent years, with the increase in the prevalence of precoated steel sheets, precoated steel sheets have come to be used also in the drawn portion.
【０００３】絞り加工部へプレコート鋼板を使用する際
には、従来は塗膜の引張試験による伸び率の高い塗膜や
Ｔ折り曲げ試験結果の良い塗膜を選択し、円筒絞りや角
筒絞り試験を実施して評価結果の良いものを絞り加工部
に使用してきた。Conventionally, when a precoated steel sheet is used for a drawn portion, a coating film having a high elongation rate by a tensile test of the coating film or a coating film having a good T-bending test result is selected, and a cylindrical drawing or a rectangular tube drawing test is performed. Has been carried out, and the one having a good evaluation result has been used for the drawn portion.
【０００４】[0004]
【発明が解決しようとする課題】絞り加工は、鋼板に引
張と圧縮の歪みが発生する変形様式であり、曲げ加工性
が良く、単に伸びるだけの塗膜では絞り加工に十分に対
応できず、加工後に塗膜が剥離してしまう場合が多いThe drawing process is a deformation mode in which tensile and compressive strains occur in a steel plate, has good bending workability, and a coating film that merely stretches cannot sufficiently support the drawing process. The coating often peels off after processing
【０００５】そこで、本発明の目的は、絞り加工部に使
用した場合に塗膜剥離や塗膜割れ等が発生せず、外観良
好な絞り成形性に優れたプレコート鋼板を提供すること
である。Therefore, an object of the present invention is to provide a precoated steel sheet which does not cause coating peeling or coating cracking when used in a drawn portion and has an excellent appearance and excellent draw formability.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、種々の樹
脂塗膜について検討した結果、樹脂塗膜の物理的性質を
特定することによって絞り成形に十分適応できることを
知見した。本発明は、この知見に基づくものであって、
鋼板に、引張試験で弾性比例限界を有し、かつ２０〜３
００ｋｇ／ｍｍ2 の引張弾性率を有する樹脂塗膜を被覆
したことを特徴とする絞り成形性に優れたプレコート鋼
板である。前記樹脂塗膜は、弾性限界伸びが１５％以下
であること、引張試験で降伏点伸びを有することが絞り
成形性に好適である。As a result of studying various resin coating films, the present inventors have found that by specifying the physical properties of the resin coating film, it can be sufficiently applied to drawing. The present invention is based on this finding,
Steel plate has elastic proportional limit in tensile test and 20 ~ 3
A precoated steel sheet excellent in drawability, characterized by being coated with a resin coating film having a tensile elastic modulus of 00 kg / mm 2 . It is suitable for drawability that the resin coating film has an elastic limit elongation of 15% or less and a yield point elongation in a tensile test.
【０００７】本発明のプレコート鋼板に使用する鋼板
は、冷延鋼板や亜鉛めっき鋼板等の表面処理鋼板やその
他の薄鋼板で、特に制約するものではない。必要があれ
ば、鋼板上にクロメート処理等の化成処理を施してプレ
コート鋼板用に供する。The steel sheet used for the pre-coated steel sheet of the present invention is a surface-treated steel sheet such as a cold rolled steel sheet or a galvanized steel sheet, or other thin steel sheet, and is not particularly limited. If necessary, the steel sheet is subjected to chemical conversion treatment such as chromate treatment and used for pre-coated steel sheets.
【０００８】本発明のプレコート鋼板においては、絞り
成形性を良好とするために、鋼板上に被覆する樹脂塗膜
の引張特性を規定する。すなわち、樹脂塗膜は、引張試
験において弾性比例限界を有し、かつ引張弾性率が２０
〜３００ｋｇ／ｍｍ2 の範囲のものに限定する。この条
件から外れる樹脂塗膜では、絞り成形性を十分に得るこ
とはできない。In the precoated steel sheet of the present invention, the tensile properties of the resin coating film coated on the steel sheet are specified in order to improve the drawability. That is, the resin coating film has an elastic proportional limit in a tensile test and has a tensile elastic modulus of 20.
It is limited to the range of up to 300 kg / mm 2 . If the resin coating film deviates from this condition, sufficient drawability cannot be obtained.
【０００９】上記樹脂塗膜は、絞り成形性をさらに良好
とするために、弾性限界伸びを１５％以下とすることが
好ましい。一方、全伸びについては、１５％以上が好ま
しい。The above resin coating film preferably has an elastic limit elongation of 15% or less in order to further improve the draw formability. On the other hand, the total elongation is preferably 15% or more.
【００１０】また、上記樹脂塗膜は、引張試験をした際
に降伏点伸びを有することが、さらに絞り成形性を良く
するために好適である。Further, it is preferable that the resin coating film has an elongation at yield when subjected to a tensile test in order to further improve draw formability.
【００１１】以上のように樹脂塗膜の引張特性を規定す
ることによって絞り成形性が優れる理由は不明である
が、絞り成形様式の引張と圧縮を鋼板が受けた際に、鋼
板上の樹脂塗膜も鋼板の変形にうまく追従して変形する
ために上記条件がうまく作用しているものと考えられ
る。Although the reason why the drawability is excellent by defining the tensile properties of the resin coating film as described above, it is not clear that when the steel sheet is subjected to the drawing and drawing tension and compression, the resin coating on the steel sheet is performed. It is considered that the above condition works well because the film also deforms following the deformation of the steel plate well.
【００１２】塗膜として用いる樹脂は特に制約するもの
ではないが、通常、ポリエステル樹脂、アクリル樹脂、
エポキシ樹脂等を用いることができる。これら樹脂に上
記引張特性を付与するには、樹脂塗膜のＴｇを上げる、
樹脂に硬化剤を添加する、塗膜の焼き付け温度を高くす
ることで塗膜の架橋密度を上げる等の手段が挙げられ、
これらを必要に応じて組み合わせることによって前記引
張特性が得られる。The resin used as the coating film is not particularly limited, but usually polyester resin, acrylic resin,
An epoxy resin or the like can be used. To impart the above tensile properties to these resins, increase the Tg of the resin coating film,
Means such as adding a curing agent to the resin, increasing the cross-linking density of the coating film by increasing the baking temperature of the coating film,
The tensile properties can be obtained by combining these as necessary.
【００１３】[0013]
【実施例】板厚：０．６ｍｍの冷延鋼板上にクロメート
処理を施し、その上にポリエステル系プライマー塗膜を
積層し、その上に表１に示す引張特性を持った高分子ポ
リエステル系樹脂をベースとした樹脂塗膜を膜厚：１５
μｍ塗装してプレコート鋼板を作成した。その後に角筒
成形試験を行い、コーナー絞り部の塗膜の破壊形態を観
察した。Example: Chromate treatment is applied to a cold-rolled steel sheet having a plate thickness of 0.6 mm, a polyester-based primer coating film is laminated on the cold-rolled steel sheet, and a polymer polyester resin having the tensile properties shown in Table 1 is formed thereon. Resin coating based on
A pre-coated steel sheet was prepared by coating with μm. After that, a square tube forming test was performed to observe the fracture mode of the coating film in the corner drawn portion.
【００１４】樹脂塗膜の引張特性については、まず樹脂
塗膜をテフロンシート上にバーコーターで膜厚：１５μ
ｍ塗装し、焼き付け後、テフロンシートより樹脂塗膜を
剥離して樹脂塗膜のフリーフィルムを作成し、このフリ
ーフィルムから１０ｍｍ×５０ｍｍの試験片を作成し、
引張試験を実施した。引張試験はオリエンテック社製
「テンシロンＣＴ−１０Ｔ」を用いて室温で引張スピー
ド１０ｍｍ／ｍｉｎで行い、樹脂塗膜の荷重−伸びより
引張特性を得た。Regarding the tensile properties of the resin coating film, first, the resin coating film was placed on a Teflon sheet with a bar coater to a film thickness of 15 μm.
After coating and baking, the resin coating film is peeled off from the Teflon sheet to create a free film of the resin coating film, and a 10 mm x 50 mm test piece is prepared from this free film.
A tensile test was performed. The tensile test was carried out at room temperature at a tensile speed of 10 mm / min using "Tensilon CT-10T" manufactured by Orientec Co., Ltd., and the tensile properties were obtained from the load-elongation of the resin coating film.
【００１５】角筒絞りは、ポンチサイズ：□７０ｍｍ、
ポンチ肩Ｒ：２ｍｍ、ポンチコーナーＲ：１０ｍｍの金
型を使い、ブランクサイズ：□１４０ｍｍ、ＢＨＦ：５
ｔ、成形高さ：３０ｍｍで実施し、成形品のコーナー絞
り部の外観観察を行い、以下の基準で判定した。The square tube diaphragm has a punch size of 70 mm,
Punch shoulder R: 2 mm, punch corner R: 10 mm, blank size: □ 140 mm, BHF: 5
t, molding height: 30 mm, the appearance of the corner drawn portion of the molded product was observed, and the judgment was made according to the following criteria.
【００１６】 ◎：塗膜剥離、塗膜割れが認められない ○：塗膜剥離、塗膜割れが少し認められるが問題ないレ
ベル △：塗膜剥離、塗膜割れが共に認められる ×：塗膜剥離、塗膜割れが共に大いに認められる⊚: No peeling of coating film or cracking of coating film ◯: Little peeling of coating film or cracking of coating film but no problem level Δ: Both peeling of coating film and cracking of coating film are observed ×: Coating film Peeling and cracking of the coating film are largely observed
【００１７】樹脂塗膜の応力−伸び線図を図１に、評価
結果を表１に示す。表１と図１から明らかなように、応
力−伸び線図で弾性比例限界を有し、引張弾性率が２０
〜３００ｋｇ／ｍｍ2 の樹脂塗膜が絞り成形性に優れ、
外観が良かった。また、弾性限界伸びが１５％以下のも
の、降伏点伸びを有するもの、塗膜の全伸びが１５％以
上になるものが更に絞り成形性が良く、塗膜剥離、塗膜
割れが認められなかった。The stress-elongation diagram of the resin coating film is shown in FIG. 1, and the evaluation results are shown in Table 1. As is clear from Table 1 and FIG. 1, the stress-elongation diagram has an elastic proportional limit and a tensile modulus of 20.
Resin coating of ~ 300 kg / mm 2 has excellent drawability,
The appearance was good. Further, those having an elastic limit elongation of 15% or less, those having a yield point elongation, and those whose total elongation of the coating film is 15% or more have better draw formability, and peeling of the coating film and cracking of the coating film are not observed. It was
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【発明の効果】本発明のプレコート鋼板は、絞り成形加
工を行っても塗膜剥離や塗膜割れが発生しない。これに
より、深絞り加工など厳しい成形加工部にもプレコート
鋼板を使用することが可能となり、プレコート鋼板の用
途が広がる。また、現在プレコート鋼板を折り曲げ加工
で使用している製品についても、絞り成形で製造するこ
とが可能となり、製品のデザイン面でも自由度が増し、
加工形状に広がりができる。EFFECTS OF THE INVENTION The precoated steel sheet of the present invention does not cause peeling of coating film or cracking of coating film even if it is drawn. As a result, it becomes possible to use the precoated steel sheet even in a severely formed portion such as deep drawing, and the applications of the precoated steel sheet are expanded. In addition, products that are currently used for bending pre-coated steel sheets can also be manufactured by drawing, increasing the degree of freedom in terms of product design,
The processed shape can be expanded.
【図１】樹脂塗膜の引張試験による応力−伸び線図であ
る。FIG. 1 is a stress-elongation diagram according to a tensile test of a resin coating film.
Claims (3)
し、かつ２０〜３００ｋｇ／ｍｍ2 の引張弾性率を有す
る樹脂塗膜を被覆したことを特徴とする絞り成形性に優
れたプレコート鋼板。1. A pre-coated steel sheet having excellent draw formability, characterized in that the steel sheet is coated with a resin coating film having an elastic proportional limit in a tensile test and a tensile elastic modulus of 20 to 300 kg / mm 2. .
あることを特徴とする請求項１記載の絞り成形性に優れ
たプレコート鋼板。2. The precoated steel sheet excellent in draw formability according to claim 1, wherein the elastic limit elongation of the resin coating film is 15% or less.
ることを特徴とする請求項１または２記載の絞り成形性
に優れたプレコート鋼板。3. The precoated steel sheet excellent in draw formability according to claim 1, wherein the resin coating film has elongation at yield in a tensile test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2480896A JPH09193286A (en) | 1996-01-19 | 1996-01-19 | Pre-coated steel sheet with excellent drawability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2480896A JPH09193286A (en) | 1996-01-19 | 1996-01-19 | Pre-coated steel sheet with excellent drawability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09193286A true JPH09193286A (en) | 1997-07-29 |
Family
ID=12148502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2480896A Pending JPH09193286A (en) | 1996-01-19 | 1996-01-19 | Pre-coated steel sheet with excellent drawability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09193286A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022210199A1 (en) | 2021-03-31 | 2022-10-06 | 日本製鉄株式会社 | Pre-coated plated steel sheet, and moulded article |
| US12497519B2 (en) | 2021-03-31 | 2025-12-16 | Nippon Steel Corporation | Pre-coated plated steel sheet and molded product |
-
1996
- 1996-01-19 JP JP2480896A patent/JPH09193286A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022210199A1 (en) | 2021-03-31 | 2022-10-06 | 日本製鉄株式会社 | Pre-coated plated steel sheet, and moulded article |
| KR20230155535A (en) | 2021-03-31 | 2023-11-10 | 닛폰세이테츠 가부시키가이샤 | Pre-coated plated steel sheets and molded products |
| US12421588B2 (en) | 2021-03-31 | 2025-09-23 | Nippon Steel Corporation | Pre-coated plated steel sheet and molded product |
| US12497519B2 (en) | 2021-03-31 | 2025-12-16 | Nippon Steel Corporation | Pre-coated plated steel sheet and molded product |
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