JPS62252613A - Forming method for precoat metal - Google Patents
Forming method for precoat metalInfo
- Publication number
- JPS62252613A JPS62252613A JP61094677A JP9467786A JPS62252613A JP S62252613 A JPS62252613 A JP S62252613A JP 61094677 A JP61094677 A JP 61094677A JP 9467786 A JP9467786 A JP 9467786A JP S62252613 A JPS62252613 A JP S62252613A
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- temp
- forming
- temperature
- resin film
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 20
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims abstract 3
- 239000011248 coating agent Substances 0.000 claims description 26
- 238000000576 coating method Methods 0.000 claims description 26
- 238000005452 bending Methods 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 229920006267 polyester film Polymers 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 9
- 238000005336 cracking Methods 0.000 description 2
- 238000013000 roll bending Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- OSKILZSXDKESQH-UHFFFAOYSA-K zinc;iron(2+);phosphate Chemical compound [Fe+2].[Zn+2].[O-]P([O-])([O-])=O OSKILZSXDKESQH-UHFFFAOYSA-K 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は金属板の表面に熱硬化性の樹脂塗膜を施したプ
レコートメタルの成形加工方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for forming a precoated metal in which a thermosetting resin coating is applied to the surface of a metal plate.
（従来の技術）
一般に各種電化製品にはプレコートメタルが多用されて
いる。これの成形加工としては各種のものがあり、折＊
放工、絞り加工や四−ル曲げ加工などがあるが、通常の
方法でこれらの加工を行なうと、一般の金属の成形とは
異り、塗膜にき裂や剥離などが生じるため加温加工が行
なわれ”でりる。これについて一般に樹脂塗膜のガラス
転移温度Ｔｙ付近の温度で成形加工を行なえば塗膜の伸
びが増大しているので、き裂や剥離が起きにくいといわ
れている。しかし実際に塗膜のＴｙ点で曲げ加工を行な
うと、ｅにロール曲げ加工番とおいては塗膜表面１ζ傷
がつき、外観的にも、耐食性の面からも好ましくないと
いう不都合があった。(Prior Art) Generally, pre-coated metal is widely used in various electrical appliances. There are various molding processes for this, and
There are firing, drawing, and four-wheel bending processes, but unlike ordinary metal forming, when these processes are performed using normal methods, the coating film may crack or peel, so heating processing is required. It is generally said that if the molding process is performed at a temperature close to the glass transition temperature Ty of the resin coating, the elongation of the coating will increase, making cracking and peeling less likely. However, when actually bending the coating film at the Ty point, there was a problem in that the coating film surface was scratched 1ζ in the roll bending process number e, which was unfavorable from both the appearance and corrosion resistance standpoint. .
（発明が解決しようとする問題点）
上記したようにプレス−トメタルの成形加工は常温では
き裂や剥離が起り、 Ｔｐ点近近では軟かすぎて傷がつ
くという不都合がある。(Problems to be Solved by the Invention) As mentioned above, the forming process of pressed metal has the disadvantages that cracks and peeling occur at room temperature, and that it is too soft near the Tp point and causes scratches.
本発明はこれらの不都合を除去するためになされたもの
で、塗膜にき裂や剥離を生じさせないプレープートメタ
ルの成形方法を提供することを巨木発明はプレコートメ
タルの成形加工方法であって、塗膜の硬度が、 Ｔｙ点
１こおける硬度より窩い硬度を保つ温度以下で、かつ塗
膜の伸びの増大が始まる温度以上の温度で成形加工する
プレコートメタルの成形加工方法である。The present invention has been made to eliminate these disadvantages, and the object of the present invention is to provide a method for forming precoated metal that does not cause cracks or peeling of the coating film. This is a method for forming precoated metal in which the hardness of the coating film is formed at a temperature below the temperature at which the hardness of the coating film remains below the hardness at the Ty point and above the temperature at which the elongation of the coating film begins to increase.
（作用）
一般に成形加工においては、ｍ膜の伸びが不足すると加
工に際し、き裂や剥離が生じるが、樹脂に詔いては、伸
び率はある温度で増大が始まり。(Function) In general, in molding processing, if the elongation of the M film is insufficient, cracks and peeling will occur during processing, but when applied to resins, the elongation rate begins to increase at a certain temperature.
この温度以上になると伸び率は、たちまち２０カを超え
一般製品の成形加工に十分耐える伸び率となる。また温
度が高い程き裂や剥離の発生は防止できるが１例えばＴ
ｇ点で加工すると硬度が低いので。When the temperature exceeds this temperature, the elongation rate immediately exceeds 20 degrees, an elongation rate that is sufficient to withstand the molding process of general products. In addition, the higher the temperature, the more likely it is that cracks and peeling can be prevented.
If processed at point g, the hardness will be low.
加工１こ際し傷が生じ易くなる。これを防ぐには少なく
ともＴ１点における硬度より高い硬度であることが必要
である。従って伸び率の増大が始まる温度以上でＴ１点
における硬度より高い硬度を保つ温度以下で成形加工を
行なうのが好ましい。Scratches are more likely to occur during processing. To prevent this, it is necessary that the hardness is at least higher than the hardness at the T1 point. Therefore, it is preferable to carry out the forming process at a temperature above the temperature at which the elongation rate begins to increase and below a temperature at which the hardness is maintained higher than the hardness at the T1 point.
（実施例）
以下１本発明の詳細を一実施例により説明する。まずプ
レコートメタルについて説明すると。(Example) The details of the present invention will be explained below using an example. First, let me explain about pre-coated metal.
厚さ０．５ｍの８ＦＣＣにリン酸鉄亜鉛系処理をして被
膜重量１．０〜１．３８＃Δがの被膜を施した。その後
熱硬化性樹脂のポリエステル系粉体塗料としてニツベプ
レコート３００（商品名２日本ベイン）（１＃りを約５
０μｍ塗布し、遠赤外線を照射して塗膜表面温度２５０
℃〜２６０℃に９０秒保って焼付けた。その後この硬化
塗膜のＴ１８５℃より４０℃低い４５℃にこの塗装した
鋼板全体を熱し１通常のベンダを用いて内側半径３ｍ、
角度１８０度に折曲加工を行なった。この結果塗膜藺に
はき裂、剥離や傷の少ない良好な製品が得られた。A film having a film weight of 1.0 to 1.38 #Δ was applied to 8FCC having a thickness of 0.5 m by iron zinc phosphate treatment. Afterwards, Nitsube Precoat 300 (trade name 2 Nippon Bain) (1#) was used as a thermosetting resin polyester powder coating.
0 μm coating and irradiation with far infrared rays to reach a coating surface temperature of 250 μm.
Baking was carried out by keeping the temperature between 260°C and 260°C for 90 seconds. Thereafter, the entire coated steel plate was heated to 45°C, which is 40°C lower than the T185°C of this cured coating, and the inside radius was 3 m using a normal bender.
It was bent at an angle of 180 degrees. As a result, a good product with few cracks, peeling, and scratches on the coating film was obtained.
なお、ａ化塗膜のＴｙはＤｉ９Ｃ（示差走査熱量計）お
よび剛体振子の減衰振動法から求めた結果的８５℃〜１
００℃であって、熱的な性質と硬さに起因した粘弾性的
性質から求めたものである。次に成形加工温度４５℃に
つき図を参照して説明する。図は熱硬化性ポリエステル
塗膜の伸び率壜よび鉛筆硬さの温度変化を示したもので
、曲線人は塗膜の伸び率であり１曲線Ｂは鉛筆硬さであ
る。塗膜の厚さは５Ｑ、ａｍであり、測定器はテンシ四
ンで、引張速度は１０Ｍｌ５／ｎ１ｉｎである。図から
明らかなように伸び率の増大し始める点は約４０℃であ
り、硬度は４０℃〜６０℃の間はＴｇ点における硬度よ
り高くほぼＦであって著しい硬度の低下はなく１本発明
による成形加工温度である。実施例のプレコートメタル
をこの４０℃〜６０℃の間で実施例゛と同様な成形加工
を行なった結果すべて塗膜面にき裂や剥離がなく１表面
の傷も少なく、良好な結果を得た。またＴｇの８５℃で
折曲した場合は金属板の変形、塗膜の軟化の問題から数
μｍの傷を生じた。これらの傷は成形温度を下げるに従
って減少し、７０℃では非常に少なくなり、上述した４
０℃〜６０℃の間ではほとんどなくなった。また４０℃
未満においては、塗膜にクラックが入り、り２ツクが目
視では観察されないような場合でも、電子顕微鏡で観察
すると、小さなき裂が入り、耐食性の悪い結果が得られ
た。この成形温度範囲の上限は製品に要求される傷の程
度により決めればよいがＴｇ点における硬度では不可で
ある。In addition, the Ty of the a coating film was determined from Di9C (differential scanning calorimeter) and the damped vibration method of a rigid pendulum.
00°C, which was determined from thermal properties and viscoelastic properties caused by hardness. Next, the molding temperature of 45° C. will be explained with reference to the drawings. The figure shows temperature changes in the elongation rate and pencil hardness of a thermosetting polyester coating film, where curve 1 is the elongation rate of the coating film and curve B is the pencil hardness. The thickness of the coating film is 5Q, am, the measuring device is Tenshishin, and the tensile speed is 10Ml5/n1in. As is clear from the figure, the point at which the elongation rate begins to increase is about 40°C, and the hardness is higher than the hardness at the Tg point between 40°C and 60°C, and is approximately F, and there is no significant decrease in hardness, which is the present invention. This is the molding temperature. When the pre-coated metal of the example was subjected to the same molding process as in Example 2 between 40°C and 60°C, good results were obtained, with no cracks or peeling on the coated film surface, and few scratches on the surface. . Furthermore, when the sheet was bent at a Tg of 85° C., scratches of several μm were caused due to the problems of deformation of the metal plate and softening of the coating film. These scratches decrease as the molding temperature is lowered, and become extremely rare at 70°C, which is the same as the above-mentioned 4.
It almost disappeared between 0°C and 60°C. 40℃ again
In cases where the coating film was cracked and cracks were not visually observed, small cracks were observed when observed under an electron microscope, resulting in poor corrosion resistance. The upper limit of this molding temperature range may be determined depending on the degree of scratches required for the product, but cannot be determined based on the hardness at the Tg point.
なお１本実施例は折曲加工について述べたがこれｌζ限
らず、絞り加工、ロール曲げ加工でもよいことはもちろ
んである。Although this embodiment has been described with respect to bending, this is not limited to lζ, and it goes without saying that drawing and roll bending may also be used.
以上詳述したように１本発明のプレコートメタルの成形
加工方法は、塗膜の伸び率の増大し始めの温度以上で、
しかも硬度が著しく低くなく。As described in detail above, the precoated metal forming method of the present invention includes:
Moreover, the hardness is not extremely low.
Ｔｆ点化おける硬度より高い硬度の温度以下の範囲で成
形加工を行なうので、伸び率は十分高く、き裂や剥離が
なく、硬度も著しく低いようなことがないので加工に際
して傷がつくことも極めて少いので外観、耐食性におい
てすぐれた加工ができる効果を賽するものである。Since the forming process is performed at a temperature below the hardness higher than the hardness at the Tf point, the elongation rate is sufficiently high, there is no cracking or peeling, and the hardness is not extremely low, so there is no possibility of scratches during processing. Since the amount is extremely small, it has the advantage of being able to be processed with excellent appearance and corrosion resistance.
図は熱硬化性ポリエステル樹脂塗膜の特性曲線図である
。
代理人 弁理士 則 近 憲 佑
同 竹 花 喜久男
１度 （°Ｃ）The figure is a characteristic curve diagram of a thermosetting polyester resin coating film. Agent Patent Attorney Noriyuki Chika Yudo Kikuo Takehana 1st degree (°C)
Claims (2)
けたプレコートメタルの成形加工に際し、上記樹脂塗膜
の伸び率の増大が始まる温度以上でかつ硬度が上記樹脂
塗膜のガラス転移温度における硬度より高い温度以下で
成形加工することを特徴とするプレコートメタルの成形
加工方法。(1) When forming a pre-coated metal with a hardened thermosetting resin coating on the surface of a metal plate, the temperature at which the elongation rate of the resin coating starts to increase and the hardness of the glass of the resin coating is exceeded. A method for forming pre-coated metal, characterized by forming the metal at a temperature lower than the hardness at the transition temperature.
ステル塗膜を施したものであり、加工温度は４５℃以上
で、かつ硬度が鉛筆硬度でＦである温度以下であり、成
形加工は折曲加工であることを特徴とする特許請求の範
囲第１項記載のプレコートメタルの成形加工方法。(2) Pre-coated metal is SPCC coated with a thermosetting polyester coating, and the processing temperature is 45°C or higher and the hardness is below F on the pencil hardness scale, and the forming process is bending. A method for forming a precoated metal according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61094677A JPS62252613A (en) | 1986-04-25 | 1986-04-25 | Forming method for precoat metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61094677A JPS62252613A (en) | 1986-04-25 | 1986-04-25 | Forming method for precoat metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62252613A true JPS62252613A (en) | 1987-11-04 |
Family
ID=14116851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61094677A Pending JPS62252613A (en) | 1986-04-25 | 1986-04-25 | Forming method for precoat metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62252613A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5249447A (en) * | 1989-02-16 | 1993-10-05 | Toyo Seikan Kaisha Ltd. | Process for preparation of thickness-reduced deep-draw-formed can |
-
1986
- 1986-04-25 JP JP61094677A patent/JPS62252613A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5249447A (en) * | 1989-02-16 | 1993-10-05 | Toyo Seikan Kaisha Ltd. | Process for preparation of thickness-reduced deep-draw-formed can |
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