JP2005290399A - Steel material having excellent laser cutting property - Google Patents
Steel material having excellent laser cutting property Download PDFInfo
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- JP2005290399A JP2005290399A JP2004102625A JP2004102625A JP2005290399A JP 2005290399 A JP2005290399 A JP 2005290399A JP 2004102625 A JP2004102625 A JP 2004102625A JP 2004102625 A JP2004102625 A JP 2004102625A JP 2005290399 A JP2005290399 A JP 2005290399A
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Abstract
Description
本発明は、防錆性およびレーザー切断性、特に、レーザー切断面の美麗性に優れた鋼材に関する。 The present invention relates to a steel material excellent in rust prevention and laser cutting properties, in particular, the beauty of a laser cut surface.
造船、建築等の分野において使用される厚板鋼板は、熱影響が少ないこと、切断歪みが小さいこと、無人化レベルの自動化が比較的容易であること等の利点から、レーザーによる切断が多用されている。また、鋼板表面には、防錆のためにプライマー処理が通常施されている。このため、プライマー処理によるレーザー切断性の悪化、特に亜鉛(Zn)を含有するプライマーを塗布した鋼板については高速切断が難しいという問題があった。そこで、切削速度の低減を防止するため、Zn≦40g/m2、および、Zn+8(SiO2)≦50g/m2の条件を満足するプライマー剤を塗布したことを特徴とする、レーザー切断用鋼材が開示されている(例えば、特許文献1参照)
しかしながら、特許文献1に開示された発明は切断速度の低減を防止するものの、切断面品質については、さらなる向上が要請されていた。すなわち、レーザー切断後の切断面にドロスが付着するため、付着したドロスを除去するための手入れ工程が必要になるという問題があった。
本発明は、かかる問題に対応するものであって、プライマー処理された鋼材をレーザー切断した場合であっても、レーザー切断面が美麗に維持され、レーザー切断性に優れた鋼材を提供することを目的とする。
However, although the invention disclosed in Patent Document 1 prevents the cutting speed from being reduced, further improvement in cutting surface quality has been demanded. That is, since dross adheres to the cut surface after laser cutting, there is a problem that a care process for removing the adhered dross is required.
The present invention addresses such problems, and provides a steel material that maintains a laser-cut surface and is excellent in laser-cutting properties even when the primer-treated steel material is laser-cut. Objective.
(1)本発明のレーザー切断性に優れた鋼材は、金属酸化物粉末および亜鉛(Zn)粉末を含有するプライマーが表面に塗布されていることを特徴とする。
(2)また、前記金属酸化物粉末が酸化チタン(TiO2)粉末であることを特徴とする。
(3)さらに、前記表面がブラスト処理されていることを特徴とする。
(1) The steel material excellent in laser cutting property of the present invention is characterized in that a primer containing a metal oxide powder and zinc (Zn) powder is applied to the surface.
(2) Further, the metal oxide powder is a titanium oxide (TiO2) powder.
(3) Further, the surface is blasted.
プライマー処理された鋼材をレーザー切断した場合には切断速度の低下が起こる。レーザー切断速度低下のメカニズムは明確にはなっていないが、一次防錆処理として行われるプライマー塗装により、(1)一次防錆処理剤によるレーザー吸収率の低下(2)切断時の加熱による一次防錆剤中のバインダー樹脂やZn粉末の分解や蒸発によるレーザー光の散乱・吸収(3)発生したガスによるアシストガス(酸素)の分圧低下等が原因で切断速度の低下が起こると推定される。 When the primer-treated steel material is laser-cut, the cutting speed is reduced. Although the mechanism of the laser cutting speed reduction is not clear, primer coating performed as the primary rust prevention treatment makes it possible to (1) reduce the laser absorption rate by the primary rust prevention treatment agent (2) primary prevention by heating during cutting Scattering / absorption of laser light due to decomposition and evaporation of binder resin and Zn powder in rusting agent (3) It is estimated that cutting speed will decrease due to reduced partial pressure of assist gas (oxygen) due to generated gas .
発明者等は、高速レーザー切断おいてもレーザー切断面について特に美麗性を保証することに着目して研究を重ねた結果、低ガス発生性樹脂(アルキルシリケート)をバインダーとしてZn粉末を含有したプライマーに金属酸化物粉末を含有すると、レーザー切断面におけるドロスの発生が激減することを見出した。本発明はかかる知見に基づくものである。 As a result of repeated researches focusing on ensuring the beauty of the laser cut surface even in high-speed laser cutting, the inventors have found that a primer containing Zn powder with a low gas generating resin (alkyl silicate) as a binder. It has been found that when metal oxide powder is contained, dross generation on the laser cut surface is drastically reduced. The present invention is based on such knowledge.
表1は本発明を実施するための試作に用いたサンプルを示す。表1において、一次プライマー塗料調合液として低ガス発生性樹脂(アルキルシリケート、以下「樹脂」と称す)、亜鉛(Zn)粉末と金属酸化物として酸化チタン粉末を試作し鋼板に塗布した。樹脂及びシンナーなどを含む樹脂ベースを一定量(300g)とし、亜鉛(Zn)粉末及び酸化チタンを変化させて塗料を調合し、切断速度及び防錆性の評価を行った。一定量の樹脂ベースに酸化チタンを含有せず亜鉛量を段階的に減らしたものを「試作サンプル1〜4」とし、更に、試作サンプル1、3に、酸化チタンを加えたものを「試作サンプル5、6」としている。
なお、酸化チタンはルチル型で、平均粒径が0.21μmである。
Table 1 shows samples used for trial production for carrying out the present invention. In Table 1, a low gas-generating resin (alkyl silicate, hereinafter referred to as “resin”), a zinc (Zn) powder and a titanium oxide powder as a metal oxide were prepared as a primary primer coating composition, and applied to a steel plate. A resin base containing a resin, thinner and the like was made into a fixed amount (300 g), and paint was prepared by changing zinc (Zn) powder and titanium oxide, and the cutting speed and rust prevention property were evaluated. Samples with a certain amount of resin base containing no titanium oxide and gradually reducing the amount of zinc are referred to as “prototype samples 1 to 4”. 5, 6 ”.
Titanium oxide is rutile and has an average particle size of 0.21 μm.
なお、各サンプルに用いた鋼材は、SM490級、200mm×100mm×厚さ11mmで、表面にショットブラス処理を実施して表面粗度をRZ60に仕上げている。
また、プライマーの塗布は、スプレーガンによって直接、鋼板表面に向けて噴霧し、塗装前後の重量測定によって、塗布量(1平方メートル当たり)を算出した。
また、以下のレーザー切削は、三菱電機(株)製炭酸ガスレーザー装置を用いて、出力3kWで、アシストガスとして酸素を0.1MPaにて噴射した。また、切削速度は400〜1000m/分である。また、また、防錆性をJISK5552ジンクリッチプラ−マーに準拠してSSTで評価した。
In addition, the steel materials used for each sample are SM490 grade, 200 mm × 100 mm × thickness 11 mm, and the surface is subjected to shot blasting to finish the surface roughness to RZ60.
In addition, the primer was sprayed directly onto the steel plate surface with a spray gun, and the coating amount (per square meter) was calculated by measuring the weight before and after coating.
Further, in the following laser cutting, oxygen was injected at 0.1 MPa as an assist gas with an output of 3 kW using a carbon dioxide laser device manufactured by Mitsubishi Electric Corporation. The cutting speed is 400 to 1000 m / min. Moreover, rust prevention property was evaluated by SST based on JISK5552 zinc rich polymer.
表2は、各試作サンプルのレーザー切断面性状と防錆性の評価結果を示す。表2において、切断速度の評価で◎は最も美麗な評点3(ドロスが皆無または極微量で切断面が整っている)、○はやや美麗な評点2(ドロスが大きいが切断面は比較的整っている)、△は美麗でない評点1(ドロスが大きいく切断面が荒れている)、×は切断不能を示している。また、防錆性の評価は規格に定めるSSTで168時間発錆がないことに基づき、168時間以上発錆のないものを○とし、168時間未満のものは×とした。 Table 2 shows the laser cut surface properties and rust prevention evaluation results of each prototype sample. In Table 2, in the evaluation of cutting speed, ◎ is the most beautiful score 3 (no dross or trace amount and the cut surface is well prepared), ○ is slightly beautiful score 2 (the dross is large but the cut surface is relatively well prepared) ), △ is an unsatisfactory score 1 (large dross and rough cut surface), and x indicates inability to cut. In addition, the evaluation of rust prevention was based on the fact that there was no rusting for 168 hours in the SST defined in the standard, and the case where there was no rusting for 168 hours or more was rated as ◯, and the case where it was less than 168 hours was marked as x.
試作サンプル1〜4においては、Zn塗布量の減少にしたがって、切断速度を速くしても美麗な切断面が得られている。すなわち、亜鉛含有量が低下する程、高速切断が可能になり、また、切断面の美麗さも改善されることが確認される。しかしながら、試作4では防錆性が劣化し実用への適用は出来ない。 In the prototype samples 1 to 4, a beautiful cut surface is obtained even when the cutting speed is increased as the Zn coating amount decreases. That is, it is confirmed that as the zinc content decreases, high-speed cutting becomes possible and the beauty of the cut surface is improved. However, in Prototype 4, the rust prevention property deteriorates and cannot be applied to practical use.
さらに、酸化チタンを含有した試作サンプル5、6は、酸化チタンの添加により、試作サンプル1、3と比較してZn塗布量は同じにあるにもかかわらず切断速度を高速にしても切断面が美麗になっている。また、防錆性評価においても、試作サンプル5、6は良好な結果となっている。 Further, the trial samples 5 and 6 containing titanium oxide have a cut surface even when the cutting speed is increased by adding titanium oxide even though the Zn coating amount is the same as that of the trial samples 1 and 3. It has become beautiful. Also, in the rust prevention evaluation, the prototype samples 5 and 6 have good results.
図1は、酸化チタンの塗布有無でのレーザー切断速度と亜鉛塗布量との関係を示す相関図である。図1において、縦軸はレーザー切断速度、横軸は亜鉛の塗布量であって、酸化チタンを含有したプライマー(酸化チタンの塗布量13.2g/m2)は、酸化チタンを含有しないプライマーと比較してレーザー切断速度を増大させても切断面が格段美麗になっている。 FIG. 1 is a correlation diagram showing the relationship between the laser cutting speed and the amount of zinc applied with and without application of titanium oxide. In FIG. 1, the vertical axis represents the laser cutting speed, the horizontal axis represents the zinc coating amount, and the primer containing titanium oxide (titanium oxide coating amount 13.2 g / m 2 ) is a primer not containing titanium oxide. Even when the laser cutting speed is increased, the cut surface is remarkably beautiful.
金属酸化物としては酸化チタンに限定されるものでなく、酸化アルミニウム(Al2O3),酸化ジルコニウム(ZrO2)等の、CO2レーザー(λ=10.6μm)の吸収性が高い金属酸化物を塗膜中に添加することで、塗膜のレーザー吸収性が向上し同様の効果が得られる。 The metal oxide is not limited to titanium oxide, and is a metal oxide having high absorption of CO 2 laser (λ = 10.6 μm), such as aluminum oxide (Al 2 O 3 ), zirconium oxide (ZrO 2 ). By adding to the coating film, the laser absorptivity of the coating film is improved and the same effect is obtained.
以上のように本発明のレーザー切断性に優れた鋼材は、造船、建築等に使用される鋼板として広く利用することができる。 As described above, the steel material excellent in laser cutting property of the present invention can be widely used as a steel plate used in shipbuilding, construction and the like.
Claims (3)
The steel material excellent in laser cutting property according to claim 1 or 2, wherein the surface is blasted.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007224344A (en) * | 2006-02-22 | 2007-09-06 | Jfe Steel Kk | Corrosion resistant marine steel material |
JP2008100427A (en) * | 2006-10-19 | 2008-05-01 | Jfe Steel Kk | Coated steel excellent in laser cutting properties and primary rust preventive properties and its production method |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007224344A (en) * | 2006-02-22 | 2007-09-06 | Jfe Steel Kk | Corrosion resistant marine steel material |
JP2008100427A (en) * | 2006-10-19 | 2008-05-01 | Jfe Steel Kk | Coated steel excellent in laser cutting properties and primary rust preventive properties and its production method |
JP4670786B2 (en) * | 2006-10-19 | 2011-04-13 | Jfeスチール株式会社 | Painted steel material excellent in laser cutting property and primary rust prevention property and manufacturing method thereof |
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