JP2011194549A - Shearing method for coated steel plate - Google Patents
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- JP2011194549A JP2011194549A JP2010067149A JP2010067149A JP2011194549A JP 2011194549 A JP2011194549 A JP 2011194549A JP 2010067149 A JP2010067149 A JP 2010067149A JP 2010067149 A JP2010067149 A JP 2010067149A JP 2011194549 A JP2011194549 A JP 2011194549A
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Abstract
Description
本発明は、エナメルヘアの発生を抑制した塗装鋼板のせん断加工方法に関する。 The present invention relates to a method for shearing a coated steel sheet in which the generation of enamel hair is suppressed.
近年、家電製品や自動車部品等として、塗装鋼板を成形した製品が多用されるようになっている。特に、ステンレス鋼板を原板とし、その表面にクリア塗装を施した塗装ステンレス鋼板が、高意匠化を目的とした家電製品に多用されるようになっている。
しかも、工程省略、コスト低減の観点から、予め塗装された鋼板が所望の製品形状にプレス成形されて使用されるようになっている。
塗装鋼板を家電製品や自動車部品等へ加工する工程では、プレス機械によるせん断加工が施される場合が多くなっている。そして、せん断加工の際、せん断端面にエナメルヘア(端面の塗膜剥離)が発生しやすい。
In recent years, products made of coated steel sheets have been widely used as home appliances and automobile parts. In particular, a coated stainless steel plate having a stainless steel plate as a base plate and a clear coating on the surface thereof is frequently used in home appliances aimed at high design.
In addition, from the viewpoint of omitting the process and reducing the cost, a pre-painted steel sheet is used after being pressed into a desired product shape.
In the process of processing a coated steel sheet into a home appliance or an automobile part, shearing by a press machine is often performed. And in the case of a shear process, an enamel hair (coating peeling of an end surface) tends to generate | occur | produce on a shear end surface.
せん断端面にエナメルヘアが発生すると、外観が損なわれて製品の品質を低下させるばかりでなく、家電製品や自動車部品等を加工する工程の途中で発生すると打痕の原因となり歩留の低下にも繋がる。
そこで、塗装鋼板にせん断加工する際に、せん断部の塗膜を予め切断したり、ダレを小さくするためにせん断クリアランスを極端に小さくしたりして、エナメルヘアの発生を防止していた。塗装鋼板の原板が表面処理鋼板である場合、ダレが大きいと原板と塗膜の間にあるめっき層の伸びが小さいためにその部分で破壊が生じてエナメルヘアが発生しやすくなるからである。
When enamel hair occurs on the shear end face, not only the appearance is deteriorated and the quality of the product is deteriorated, but if it occurs in the process of processing household appliances and automobile parts, it causes a dent and also decreases the yield. Connected.
Therefore, when the coated steel sheet is sheared, the coating film at the shearing portion is cut in advance, or the shear clearance is extremely reduced to reduce sagging, thereby preventing the occurrence of enamel hair. This is because, when the original plate of the coated steel plate is a surface-treated steel plate, if the sag is large, the elongation of the plating layer between the original plate and the coating film is small, so that the portion is easily broken and enamel hair is easily generated.
具体的に、せん断部の塗膜に予め膜厚分の切り込みを入れた後、ポンチとダイのクリアランスを板厚の5%以上、10%以下で打ち抜くことが特許文献1で提案されている。
また、原板がステンレス鋼板である場合、塗膜と原板の間にめっき層のような伸びの小さい層が存在せず、直接原板上に被覆されている。したがって、原板と塗膜の密着性の大小がエナメルヘアの発生に直接関係するため、エナメルヘアの発生を防止するには、塗膜と原板の密着性を高めるか、塗膜の厚さを極力薄くすることが必要となる。
Specifically,
Further, when the original plate is a stainless steel plate, there is no small stretch layer such as a plating layer between the coating film and the original plate, and it is directly coated on the original plate. Therefore, since the size of the adhesion between the original plate and the coating film is directly related to the generation of enamel hair, to prevent the generation of enamel hair, increase the adhesion between the coating film and the original plate, or reduce the thickness of the coating film as much as possible. It is necessary to make it thinner.
特許文献1で提案された方法では、せん断部の塗膜に予め膜厚分の切り込みを入れている。このため、せん断加工そのものが煩雑となって生産性を低下させている。
また、ステンレス鋼板にクリア塗膜を形成したような塗装ステンレス鋼板にあっては、所望の高意匠を発現させようとするときに膜厚の厚い塗膜が必要になるが、塗膜の膜厚が厚くなるほどエナメルヘアが発生しやすくなる。そして、エナメルヘアが発生した場合には、加工後に除去する作業が必要になる等、非常に作業性が悪くなる
In the method proposed in
In addition, in the case of a coated stainless steel sheet in which a clear coating film is formed on a stainless steel sheet, a thick coating film is required when trying to express a desired high design. As the thickness increases, enamel hair is more likely to occur. And when enamel hair occurs, the workability is very poor, such as the need to remove after processing.
本発明は、このような問題を解消すべく案出されたものであり、塗装鋼板にせん断加工を施す際、被加工板が比較的厚い塗膜を有する塗装鋼板であってもエナメルヘアの発生を抑制したせん断加工方法を提供することを目的とする。 The present invention has been devised to solve such problems. When shearing is applied to a coated steel sheet, enamel hair is generated even if the processed sheet is a coated steel sheet having a relatively thick coating film. An object of the present invention is to provide a shearing method that suppresses the above.
本発明の塗装鋼板のせん断加工方法は、その目的を達成するため、ダイ上に載置した塗装鋼板にパンチを押込んでせん断加工を行う際に、先端にコーナーRが付された予備パンチを押付けてせん断部位の塗膜厚を薄くした後にせん断用パンチを押込むことを特徴とする。
材料の内側を抜くせん断加工の場合は、先端の平面部に凹部が付与されるとともにその縁端部にコーナーRが付された予備パンチを押付けてせん断部位の塗膜厚を薄くした後にせん断用パンチを押込む。この際、せん断用パンチの先端平面部にも凹部が付与されているものを用いることが好ましい。
何れの場合であっても、ダイ上に載置した塗装鋼板を板押さえで押さえた状態で加工することが好ましい。
In order to achieve the purpose of the shearing method of the coated steel sheet according to the present invention, when the punch is pushed into the coated steel sheet placed on the die and shearing is performed, a preliminary punch having a corner R attached to the tip is pressed. In this case, the shearing punch is pushed in after the coating thickness at the shearing portion is reduced.
In the case of shearing to remove the inner side of the material, a concave part is added to the flat part at the tip and a preliminary punch with a corner R attached to the edge part is pressed to reduce the coating thickness at the sheared part. Push in the punch. At this time, it is preferable to use a shear punch having a concave portion on the flat end portion.
In any case, it is preferable to process the coated steel plate placed on the die while being pressed by a plate press.
本発明の塗装鋼板のせん断加工方法では、先端にコーナーRが付された予備パンチを押付けてせん断部の塗膜厚を薄くした後にせん断加工を行うことにより、エナメルヘアの発生が抑制される。このため、塗膜厚の厚い塗装鋼板を加工する際にあっても、エナメルヘアを発生させることなくせん断加工することができる。
したがって、本発明により、従前のように加工後にエナメルヘアの除去作業を行う必要がなく、作業性が向上する。
In the method for shearing a coated steel sheet according to the present invention, the occurrence of enamel hair is suppressed by pressing a preliminary punch having a corner R at the tip to reduce the coating thickness of the sheared portion and then performing the shearing process. For this reason, even when processing a coated steel sheet having a thick coating film, it can be sheared without generating enamel hair.
Therefore, according to the present invention, it is not necessary to perform the removal work of enamel hair after processing as before, and workability is improved.
本発明者等は、塗装鋼板、特にクリア塗装を施したような塗装ステンレス鋼板にせん断加工を施す際に発生するエナメルヘアの発生原因とその対策について鋭意検討を重ねてきた。
まず、エナメルヘアの発生原因について見ると、せん断端面でのエナメルヘアの発生は、塗膜が原板との界面で剥離する現象と推測される。
その現象を、図をもって説明する。
The inventors of the present invention have intensively studied the cause of enamel hair that occurs when shearing is applied to a coated steel sheet, particularly a coated stainless steel sheet that has been subjected to clear coating, and countermeasures thereof.
First, looking at the cause of enamel hair generation, the generation of enamel hair at the shear end face is presumed to be a phenomenon in which the coating film peels off at the interface with the original plate.
This phenomenon will be described with reference to the drawings.
図1に示すように、ダイ1上に載置した塗装鋼板3にパンチ2を用いたせん断加工を施す(a)とき、まずパンチ2の刃先が塗膜5に食込んで塗膜がせん断される(b)。その後にパンチ2の刃先が材料である原板4に食込んで原板がせん断され(c)、抜きカスと抜きさんとに分離される(d)。抜きカスが分離されてせん断が終わり、パンチが上方に引上げられて刃先が材料から離脱する際に(e)、塗膜端面と刃先側面が高面圧で摺動することとなって塗膜5が原板4から剥離する方向に力が働く。そして、刃先が材料から離れたときに剥離された塗膜端が本体部分から離脱されてエナメルヘアとなる、と推測される。
As shown in FIG. 1, when the coated
原板と塗膜の界面に大きなせん断力が働いた場合、界面の密着力が塗膜の破断力(=断面積×塗膜の破断応力)より小さいと塗膜が界面から剥離してエナメルヘアとなり、逆に密着力が強い場合は塗膜にクラックが生じる。図2に示す通りである。
そこで、本発明では、せん断加工時に塗膜端が本体部分から剥離・離脱されないように工夫した。
以下に、その詳細を説明する。
When a large shear force is applied to the interface between the original plate and the coating film, if the adhesion force at the interface is smaller than the breaking force of the coating film (= cross-sectional area x breaking stress of the coating film), the coating film peels from the interface and becomes enamel hair. Conversely, when the adhesion is strong, cracks occur in the coating film. As shown in FIG.
Therefore, the present invention has been devised so that the edge of the coating film is not peeled off or detached from the main body during shearing.
The details will be described below.
図2に示した塗膜厚の影響からも分かるように、膜厚が厚くなると塗膜の破断力(=断面積×塗膜の破断応力)が界面の密着力よりも大きくなって、せん断加工時に塗膜端が本体部分から剥離しやすくなり、逆に膜厚が薄いと界面の密着力よりも塗膜の破断力の方が小さいため、塗膜が割れることで塗膜端が本体部分から剥離し難くなる。
そこで、せん断加工を施すに当たって、せん断部分の塗膜厚を予め薄くしておけば、剥離し難くなってエナメルヘアの発生を抑制できると推測し、本発明に到達した。
As can be seen from the effect of the coating film thickness shown in FIG. 2, when the film thickness increases, the breaking force of the coating film (= cross-sectional area × breaking stress of the coating film) becomes larger than the adhesion force at the interface, and shear processing is performed. Sometimes the edge of the coating tends to peel off from the main body, and conversely, if the film thickness is thin, the breaking force of the coating is smaller than the adhesion at the interface, so the coating edge breaks away from the main body. It becomes difficult to peel.
Therefore, when applying the shearing process, it is assumed that if the coating thickness of the shearing portion is made thin in advance, it is difficult to peel off and generation of enamel hair can be suppressed, and the present invention has been achieved.
まず、単に材料を分断するせん断加工する際のエナメルヘア防止加工方法について説明する。
図3に示すように、(1)ダイ上に載置した塗装鋼板の所望せん断部位に、先端にコーナーRが付された予備パンチを押付けてせん断部位の塗膜を潰す。(2)それにより、所望せん断部位の塗膜厚を薄くする。その後(3)通常のせん断用のパンチを押込んで通常通りのせん断加工を行う。
塗膜厚の厚い塗装鋼板を加工する際にあっても、せん断部位の塗膜厚が薄くなっているので、図2に示した塗膜が薄い場合のように、エナメルヘアの発生を抑制することができる。
First, the enamel hair prevention processing method at the time of carrying out the shearing process which only divides | segments material is demonstrated.
As shown in FIG. 3, (1) a pre-punching with a corner R attached to the tip is pressed against a desired shearing portion of a coated steel sheet placed on a die to crush the coating film at the shearing portion. (2) Thereby, the coating film thickness of a desired shearing part is made thin. After that, (3) a normal shearing punch is pushed in and normal shearing is performed.
Even when processing a coated steel sheet with a large coating thickness, since the coating thickness at the sheared part is thin, the generation of enamel hair is suppressed as in the case where the coating film shown in FIG. 2 is thin. be able to.
次に、材料の内側をせん断加工する際のエナメルヘア防止加工方法について説明する。
図4に示すように、(1)ダイ上に載置した塗装鋼板の所望打ち抜き部位に、その縁端部にコーナーRが付された予備パンチを押付けてせん断部位の塗膜を潰す。(2)それにより、所望せん断部位の塗膜厚を薄くする。その際、塗膜の逃げを容易にするため、先端の平坦部に凹部を設けたパンチを用いる。その後(3)通常のせん断用のパンチを押込んで通常通りのせん断加工を行う。なお、せん断用のパンチには、予備パンチと同様に、先端の平坦部に塗膜を逃がすための凹部を設けていることが好ましい。
塗膜厚の厚い塗装鋼板を加工する際にあっても、打ち抜き部位の塗膜厚が薄くなっているので、図2に示した塗膜が薄い場合のように、エナメルヘアの発生を抑制することができる。
上記、せん断加工を行う際には、ダイ上に載置した塗装鋼板を板押さえで押さえた状態で加工すると、塗装鋼板を変形させることなく加工精度良く加工することができる。
Next, an enamel hair prevention processing method when shearing the inside of the material will be described.
As shown in FIG. 4, (1) a pre-punched punch with a corner R attached to its edge is pressed against the desired punched portion of the coated steel sheet placed on the die to crush the coating film at the sheared portion. (2) Thereby, the coating film thickness of a desired shearing part is made thin. At that time, in order to facilitate the escape of the coating film, a punch provided with a recess in the flat portion at the tip is used. After that, (3) a normal shearing punch is pushed in and normal shearing is performed. In addition, like the preliminary punch, the shearing punch preferably has a recess for allowing the coating film to escape at the flat portion at the tip.
Even when processing a coated steel sheet with a large coating thickness, since the coating thickness at the punched portion is thin, the generation of enamel hair is suppressed as in the case where the coating film shown in FIG. 2 is thin. be able to.
When performing the shearing process, if the coated steel sheet placed on the die is pressed with a sheet presser, the coated steel sheet can be processed with high processing accuracy without being deformed.
次に、クリア塗装を施した塗装ステンレス鋼板にせん断加工を施した事例を紹介する。素材には、表1に示す機械的特性を有する板厚0.4mmのSUS430冷延焼鈍板を原板とし、その表面にクロムフリーの塗装前処理を施した後に3,6,8,11及び17μmの厚みで高分子アクリル系のクリア塗装を施したものを用いた。
なお、前記クロムフリーの塗装前処理は、ポリビニルフェノールを添加した、可溶性のハロゲン化物や酸素酸塩を含む化成処理液を用いて行ったものである。
せん断加工条件として、表2に示す条件を採用した。加工油や保護フィルムは用いなかった。
Next, we introduce an example of applying shear processing to a coated stainless steel sheet with clear coating. The raw material is a SUS430 cold-rolled annealed sheet having a mechanical thickness shown in Table 1 and having a thickness of 0.4 mm, and the surface is subjected to chromium-free pre-coating treatment before 3, 6, 8, 11, and 17 μm. The one with a clear coating of polymer acrylic system was used.
The chromium-free pre-coating treatment is performed using a chemical conversion treatment solution containing a soluble halide or oxyacid salt to which polyvinylphenol is added.
The conditions shown in Table 2 were adopted as the shearing conditions. No processing oil or protective film was used.
まず、刃先先端にコーナーRを付していないパンチを用いて、前記5種類の塗装鋼板に打抜き加工を施した。
その結果を表3に示すが、エナメルヘアは塗膜厚8μm以上で発生していた。塗膜厚が6μm以下では口開き割れが発生しているのみであった。この状況は、クリアランスに関係なく、すべて同様の結果であった。
First, the five types of coated steel sheets were punched using a punch without a corner R attached to the tip of the blade edge.
The results are shown in Table 3. Enamel hair was generated with a coating thickness of 8 μm or more. When the coating thickness was 6 μm or less, only opening cracks occurred. This situation was all the same regardless of clearance.
次に、エナメルヘアが発生した塗膜厚8μm以上の3種類の塗装鋼板について、本発明を適用したせん断加工を施した。
予備パンチとして、表4に示す径が28.0mmで、その縁端部に1.0mmのコーナーRを付すとともに、先端の平坦部に直径16.0mmで深さ0.1mmの凹部を設けたパンチを用いた。
また、せん断用パンチおよびダイとして、表5に示す径が22.00mmで、先端の平坦部に直径16.0mmで深さ0.1mmの凹部を設けたパンチと径が22.06mmのダイを用いた。
Next, the shearing process which applied this invention was given about three types of coated steel plates with the coating-film thickness of 8 micrometers or more which the enamel hair generate | occur | produced.
As a preliminary punch, the diameter shown in Table 4 was 28.0 mm, a corner R of 1.0 mm was attached to the edge thereof, and a concave portion having a diameter of 16.0 mm and a depth of 0.1 mm was provided on the flat portion of the tip. A punch was used.
Further, as a punch and die for shearing, a punch having a diameter of 22.00 mm shown in Table 5 and a concave portion having a diameter of 16.0 mm and a depth of 0.1 mm in a flat portion at the tip and a die having a diameter of 22.06 mm Using.
この予備パンチとせん断用パンチを用いて前記3種類の塗装鋼板に、図4に準じたせん断加工を施した。
なお、予備パンチでせん断部位の塗膜厚が表6に示す膜厚になるように予備押圧した後、せん断用パンチとダイで打ち抜いた。
その結果、表6に示すように予備パンチによる予備押圧で塗膜厚を6μm以下にした後にせん断加工したものは何れもエナメルヘアを発生することなく加工することができた。
Using the preliminary punch and the shearing punch, the three kinds of coated steel sheets were subjected to a shearing process according to FIG.
In addition, after prepressing so that the film thickness of a shearing part might become the film thickness shown in Table 6 with a preliminary punch, it punched out with the shearing punch and die | dye.
As a result, as shown in Table 6, any of those subjected to shearing after the coating thickness was reduced to 6 μm or less by preliminary pressing with a preliminary punch could be processed without generating enamel hair.
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