JPH0919765A - Gas cutting method and its device - Google Patents
Gas cutting method and its deviceInfo
- Publication number
- JPH0919765A JPH0919765A JP17118895A JP17118895A JPH0919765A JP H0919765 A JPH0919765 A JP H0919765A JP 17118895 A JP17118895 A JP 17118895A JP 17118895 A JP17118895 A JP 17118895A JP H0919765 A JPH0919765 A JP H0919765A
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- cutting
- gas
- preheating
- introducing
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は鋼板などを切断する
ためのガス切断方法およびガス切断装置に関し、特に切
断効率を低下させずにランニングコストを低減したガス
切断方法およびガス切断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cutting method and a gas cutting apparatus for cutting a steel sheet or the like, and more particularly to a gas cutting method and a gas cutting apparatus which reduce running cost without reducing cutting efficiency.
【０００２】[0002]
【従来の技術】一般に鋼板のガス切断は、切断箇所を切
断開始点の発火温度（９００℃）まで加熱（予熱）した
後、この予熱炎で加熱された鋼板部に切断用ガスを噴流
させる方法で行われる。ガス切断は鉄と酸素が反応して
発生する熱を利用するために、切断用ガスとしては酸素
噴流が主として用いられ、この切断酸素の純度が高いほ
ど切れ味が良いことが知られている。2. Description of the Related Art Generally, gas cutting of a steel sheet is performed by heating (preheating) a cutting portion to an ignition temperature (900 ° C.) at a cutting start point and then jetting a cutting gas into a steel sheet portion heated by this preheating flame. Done in. Since gas cutting utilizes the heat generated by the reaction of iron and oxygen, an oxygen jet is mainly used as the cutting gas, and it is known that the higher the purity of this cutting oxygen, the better the sharpness.
【０００３】一方、ガス切断において不可欠な予熱炎の
形成は、プロパンあるいはアセチレンなどの燃料ガスと
酸素ガスを混合させ発火させて行われるが、従来は予熱
炎形成のための酸素ガスも、上記切断用の酸素ガスと同
じものを兼用していた。On the other hand, the formation of a preheating flame, which is indispensable in gas cutting, is carried out by mixing a fuel gas such as propane or acetylene with oxygen gas and igniting it. Conventionally, the oxygen gas for forming the preheating flame is also cut as described above. It also used the same oxygen gas for use.
【０００４】このような従来のガス切断方法に用いられ
る切断装置の例を図２に示す。このガス切断装置Ａは、
上流端が高純度酸素ボンベ１に接続された酸素導入管２
と、上流端が燃料ガスボンベ３に接続された燃料ガス導
入管と、これらのガス導入管２，４の下流に接続されて
予熱炎５と切断酸素噴流６を形成するためのトーチ７か
ら概略構成されている。上記酸素導入管２は、高純度酸
素が高純度酸素ボンベ１に接続された上流端から下流に
延びて分岐して予熱用酸素導入管８と切断酸素導入管９
を形成し、各々の下流端が上記トーチ７に接続してい
る。そして、燃料ガス導入管４、予熱用酸素導入管８、
切断酸素導入管９には各々、ガスの流量を調整するため
のニードル弁１０，１１，１２が設けられている。An example of a cutting device used in such a conventional gas cutting method is shown in FIG. This gas cutting device A is
Oxygen introduction pipe 2 whose upstream end is connected to a high-purity oxygen cylinder 1
And a torch 7 for forming a preheating flame 5 and a cutting oxygen jet 6 by connecting a fuel gas introduction pipe having an upstream end connected to the fuel gas cylinder 3 and a downstream of these gas introduction pipes 2, 4. Has been done. The oxygen introduction pipe 2 extends from the upstream end where high-purity oxygen is connected to the high-purity oxygen cylinder 1 to the downstream side and branches to branch into a preheating oxygen introduction pipe 8 and a cutting oxygen introduction pipe 9.
And each downstream end is connected to the torch 7. Then, the fuel gas introducing pipe 4, the preheating oxygen introducing pipe 8,
Each of the cutting oxygen introducing pipes 9 is provided with needle valves 10, 11 and 12 for adjusting the flow rate of gas.
【０００５】このガス切断装置Ａを用いて鋼板のガス切
断を行う場合、まず、燃料ガス調整用ニードル弁１０と
予熱用酸素調整用ニードル弁１１を介して燃料ガスと予
熱用酸素の流量を調整してトーチ火口内で混合しつつ、
トーチ火口外へ噴射させ、適正な予熱炎５を形成する。
ついで予熱炎５により鋼板の切断箇所の周縁をリング状
に加熱しつつ、切断酸素調整用ニードル弁９を介して切
断酸素の流量を調整して、適正な切断酸素噴流を形成さ
せ、必要に応じてトーチ７を移動させながら、鋼板の切
断を行う。When performing gas cutting of a steel sheet using this gas cutting device A, first, the flow rates of the fuel gas and the preheating oxygen are adjusted via the fuel gas adjusting needle valve 10 and the preheating oxygen adjusting needle valve 11. Then, while mixing in the torch crater,
It is injected outside the torch crater to form a proper preheating flame 5.
Then, while heating the periphery of the cut portion of the steel plate in a ring shape by the preheating flame 5, the flow rate of the cutting oxygen is adjusted via the cutting oxygen adjusting needle valve 9 to form an appropriate cutting oxygen jet, and if necessary, While moving the torch 7, the steel plate is cut.
【０００６】[0006]
【発明が解決しようとする課題】上述のごとく、切断酸
素には高純度酸素ガスを用いることが必須であるため、
予熱炎を形成する予熱用酸素にも切断用の酸素ガスを兼
用する従来の方法では、予熱用酸素として高価な高純度
酸素ガスを大量に消費し、そのために加工コストが上昇
するという問題があった。As described above, since it is essential to use high purity oxygen gas for cutting oxygen,
In the conventional method in which the oxygen gas for cutting is also used as the oxygen for preheating that forms the preheating flame, there is a problem that a large amount of expensive high-purity oxygen gas is consumed as oxygen for preheating, which increases the processing cost. It was
【０００７】本発明は、鋼板などを切断するためのガス
切断方法およびガス切断装置において、切断効率を低下
させずに、ランニングコストを低減することを目的とし
ている。It is an object of the present invention to reduce running cost without reducing cutting efficiency in a gas cutting method and a gas cutting apparatus for cutting a steel sheet or the like.
【０００８】[0008]
【課題を解決するための手段】本発明のガス切断方法に
おいては、酸素と燃料ガスを混合して予熱炎を形成しつ
つ、酸素の噴流によって切断を行うガス切断方法におい
て、予熱用酸素として、プレッシャースイング吸着法で
発生させた酸素ガス（以下ＰＳＡ酸素と称する）を用い
ることを特徴としている。In the gas cutting method of the present invention, the preheating oxygen is mixed in a gas cutting method in which oxygen and a fuel gas are mixed to form a preheating flame and cutting is performed by a jet of oxygen. It is characterized in that oxygen gas (hereinafter referred to as PSA oxygen) generated by the pressure swing adsorption method is used.
【０００９】上記方法において、予熱用酸素の酸素純度
を９０〜９５．５％としてよい。また、予熱用酸素の流
量を１，０００〜３，２００Ｎｌ／時（１気圧０℃換算
流量リットル／時）、燃料ガスの流量を３００〜９８０
Ｎｌ／時（１気圧０℃換算流量リットル／時）としてよ
い。In the above method, the oxygen purity of the preheating oxygen may be 90 to 95.5%. Further, the flow rate of oxygen for preheating is 1,000 to 3,200 Nl / hour (1 atmospheric pressure 0 ° C conversion flow rate liter / hour), and the flow rate of fuel gas is 300 to 980.
The flow rate may be Nl / hour (1 atmospheric pressure 0 ° C. conversion flow rate liter / hour).
【００１０】また本発明のガス切断装置においては、予
熱炎形成用酸素を導入するための予熱用酸素導入管と、
予熱炎形成用燃料ガスを導入するための燃料ガス導入管
と、酸素噴流形成のための切断用酸素を導入する切断酸
素導入管と、これらの導入管の下流に接続され、予熱炎
と酸素噴流を形成するためのトーチを備えたガス切断機
において、予熱炎形成用酸素導入管の上流に、プレッシ
ャースイング吸着酸素発生装置が接続されていることを
特徴としている。Further, in the gas cutting apparatus of the present invention, a preheating oxygen introducing pipe for introducing preheating flame forming oxygen,
A fuel gas introducing pipe for introducing a fuel gas for forming a preheating flame, a cutting oxygen introducing pipe for introducing cutting oxygen for forming an oxygen jet, and a preheating flame and an oxygen jet connected downstream of these introducing pipes. In a gas cutting machine equipped with a torch for forming a pressure, a pressure swing adsorption oxygen generator is connected upstream of the preheating flame forming oxygen introducing pipe.
【００１１】[0011]
【発明の実施の形態】本発明は予熱炎の形成に高純度酸
素ガスに変わる安価な酸素ガスとしてプレッシャースイ
ング吸着（以下、ＰＳＡと称する）酸素発生装置を用い
て発生させた酸素ガスを使用することによって切断コス
トの低減を図るものである。BEST MODE FOR CARRYING OUT THE INVENTION The present invention uses oxygen gas generated by using a pressure swing adsorption (hereinafter referred to as PSA) oxygen generator as an inexpensive oxygen gas which can be used as a high purity oxygen gas for forming a preheating flame. By doing so, the cutting cost is reduced.
【００１２】ＰＳＡ法は、窒素を吸着する吸着剤を通し
て、空気から窒素を分離させて濃縮した酸素を得る方法
である。空気は、酸素２１％、窒素７８％、その他１％
から構成されているので、ＰＳＡ法によって窒素分を取
り除くと、理論値で２１／２２×１００＝９５．５％
（ＭＡＸ）の純度の酸素ガスが得られる。実際のＰＳＡ
法で得られる酸素の純度は、吸着剤の性能や、その具体
的なシステムによって異なるが、通常９０〜９５％程度
と考えることができる。本発明においては、使用される
予熱用酸素の酸素純度が９０％以上であれば、火炎の安
定性、着火性、火炎温度などが維持することができ、従
来の方法と遜色なくガス切断を行うことができるので、
通常のＰＳＡ法で得られた酸素をそのまま用いることが
できる。しかしながら、性能の高い吸着剤を用いて、で
きるだけ純度の高い予熱用酸素を使用する方が切断効率
を高くすることができるので好ましい。The PSA method is a method in which nitrogen is separated from air through an adsorbent that adsorbs nitrogen to obtain concentrated oxygen. Air is 21% oxygen, 78% nitrogen, 1% other
, The theoretical value is 21/22 × 100 = 95.5% when the nitrogen content is removed by the PSA method.
Oxygen gas having a purity of (MAX) is obtained. Actual PSA
The purity of oxygen obtained by the method varies depending on the performance of the adsorbent and its specific system, but can be considered to be usually about 90 to 95%. In the present invention, if the oxygen purity of the preheating oxygen used is 90% or more, flame stability, ignitability, flame temperature, etc. can be maintained, and gas cutting is performed in the same manner as the conventional method. Because you can
Oxygen obtained by the usual PSA method can be used as it is. However, it is preferable to use the preheating oxygen having the highest possible purity by using the adsorbent having the high performance because the cutting efficiency can be increased.
【００１３】また予熱用酸素の流量を１，０００〜３，
２００Ｎｌ／時（１気圧０℃換算流量リットル／時）、
燃料ガスの流量を３００〜９８０Ｎｌ／時（１気圧０℃
換算流量リットル／時）とすることにより、特にピアシ
ングにおいて、従来の方法に匹敵する切断効率を得るこ
とができる。The flow rate of preheating oxygen is 1,000 to 3,
200 Nl / hour (1 atmospheric pressure 0 ° C conversion flow rate liter / hour),
The flow rate of fuel gas is 300 to 980 Nl / hour (1 atm 0 ° C)
By setting the flow rate to a conversion rate of liter / hour), a cutting efficiency comparable to the conventional method can be obtained particularly in piercing.
【００１４】一方、本発明のガス切断法においても、切
断酸素には従来の高純度酸素ガスを用いることが必要で
ある。切断酸素の酸素純度が９５％を下回ると、切断速
度が著しく低下するからである。On the other hand, also in the gas cutting method of the present invention, it is necessary to use conventional high-purity oxygen gas as the cutting oxygen. This is because if the oxygen purity of the cutting oxygen is less than 95%, the cutting speed will be significantly reduced.
【００１５】以下、本発明を詳しく説明する。本発明の
ガス切断方法を好適に実施するためのガス切断装置を図
１に示す。この実施例において図２に示した従来例との
共通部分は同一符号を付してその説明を簡略化する。Hereinafter, the present invention will be described in detail. A gas cutting apparatus for suitably carrying out the gas cutting method of the present invention is shown in FIG. In this embodiment, the same parts as those of the conventional example shown in FIG. 2 are designated by the same reference numerals to simplify the description.
【００１６】図１のガス切断装置Ｂは、上流端が高純度
酸素ボンベ１に接続された切断酸素導入管９と、上流端
がＰＳＡ酸素発生装置１３に接続された予熱用酸素導入
管８と、上流端が燃料ガスボンベ３に接続された燃料ガ
ス導入管４と、これらのガス導入管の下流に接続されて
予熱炎５と切断酸素噴流６を形成するためのトーチ７か
ら概略構成されている。すなわち本実施例においては、
切断酸素導入管９と予熱用酸素導入管８が独立して設け
られ、かつ予熱用酸素導入管８の上流端がＰＳＡ酸素発
生装置１３に接続していることが特徴となっている。そ
して、燃料ガス導入管４、予熱用酸素導入管８、切断酸
素導入管９には、各々、ガスの流量を調整するための、
ニードル弁１０，１１，１２が設けられている。In the gas cutting apparatus B of FIG. 1, a cutting oxygen introducing pipe 9 having an upstream end connected to the high purity oxygen cylinder 1 and a preheating oxygen introducing pipe 8 having an upstream end connected to a PSA oxygen generator 13. , A fuel gas introducing pipe 4 having an upstream end connected to a fuel gas cylinder 3, and a torch 7 connected downstream of these gas introducing pipes for forming a preheating flame 5 and a cutting oxygen jet 6. . That is, in this embodiment,
The cutting oxygen introducing pipe 9 and the preheating oxygen introducing pipe 8 are independently provided, and the upstream end of the preheating oxygen introducing pipe 8 is connected to the PSA oxygen generator 13. The fuel gas introducing pipe 4, the preheating oxygen introducing pipe 8, and the cutting oxygen introducing pipe 9 are for adjusting the gas flow rate, respectively.
Needle valves 10, 11, 12 are provided.
【００１７】予熱用酸素導入管８の上流端に接続された
ＰＳＡ発生装置１３は、原料空気を送る原料空気供給管
１４と、その下流に並列して接続された複数の吸着塔１
５，１５から概略構成されるものであり、例えば、特願
昭６１−２７３６３０号公報に記載された装置が好適に
用いられる。原料空気供給管１４には空気送風機１６が
設けられ、ここで加圧された空気は複数の吸着塔１５，
１５のうちの１つに送り込まれる。吸着塔１５，１５に
は、各々ゼオライトなどの窒素を優先的に吸着する吸着
剤が充填されており、加圧状態で導入された原料空気中
の窒素が吸着され、吸着塔１５，１５の出口において、
酸素を主成分とするガスが得られる。そしてこのＰＳＡ
酸素ガスが、ガス切断装置Ｂの予熱用酸素導入管８に供
給されるようになっている。The PSA generator 13 connected to the upstream end of the preheating oxygen introduction pipe 8 comprises a raw material air supply pipe 14 for feeding raw material air, and a plurality of adsorption towers 1 connected in parallel downstream of the raw material air supply pipe 14.
5, 15 and, for example, the device described in Japanese Patent Application No. 61-273630 is preferably used. An air blower 16 is provided in the raw material air supply pipe 14, and the air pressurized here has a plurality of adsorption towers 15,
Sent to one of fifteen. Each of the adsorption towers 15 and 15 is filled with an adsorbent that preferentially adsorbs nitrogen such as zeolite, so that the nitrogen in the raw material air introduced under pressure is adsorbed and the outlets of the adsorption towers 15 and 15 are adsorbed. At
A gas containing oxygen as a main component is obtained. And this PSA
Oxygen gas is supplied to the preheating oxygen introduction pipe 8 of the gas cutting apparatus B.
【００１８】上記ＰＳＡ発生装置１３としては、なるべ
く高い純度の酸素を得られる高性能の装置を用いること
が好ましく、得られるＰＳＡ酸素としては９０％以上が
好ましい。一般に用いられているＰＳＡ用吸着剤で達成
される酸素純度は９０％以上であるので、これをそのま
ま用いることができるが、酸素純度９２％以上が切断効
率を向上させる意味においてより好ましい。As the PSA generator 13, it is preferable to use a high-performance device capable of obtaining oxygen of the highest possible purity, and the obtained PSA oxygen is preferably 90% or more. Since the oxygen purity achieved by a commonly used PSA adsorbent is 90% or more, this can be used as it is, but an oxygen purity of 92% or more is more preferable in the sense of improving the cutting efficiency.
【００１９】このガス切断装置において鋼板のガス切断
を行う場合、まず、燃料ガス調整用ニードル弁１０と予
熱用酸素調整用ニードル弁１１を介して燃料ガスと予熱
用酸素の流量を調整してトーチ火口内で混合しつつ、ト
ーチ火口外へ噴射させ、適正な予熱炎５を形成する。こ
こで適正な予熱炎５の調整は、切断される鋼板の板厚に
応じて従来より形成されてきた火口高さｈが得られるよ
うに調整すればよい。ついで予熱炎５により鋼板の切断
箇所の周縁をリング状に加熱しつつ、切断酸素調整用ニ
ードル弁９を介して切断酸素の流量を調整して、適正な
切断酸素噴流を形成させ、必要に応じてトーチ７を移動
させながら、鋼板の切断を行う。When performing gas cutting of a steel sheet in this gas cutting apparatus, first, the flow rates of the fuel gas and the preheating oxygen are adjusted via the fuel gas adjusting needle valve 10 and the preheating oxygen adjusting needle valve 11. While being mixed in the crater, it is injected outside the torch crater to form a proper preheating flame 5. Here, the proper adjustment of the preheating flame 5 may be performed so that the crater height h conventionally formed according to the plate thickness of the steel plate to be cut can be obtained. Then, while heating the periphery of the cut portion of the steel plate in a ring shape by the preheating flame 5, the flow rate of the cutting oxygen is adjusted via the cutting oxygen adjusting needle valve 9 to form an appropriate cutting oxygen jet, and if necessary, While moving the torch 7, the steel plate is cut.
【００２０】[0020]
【実施例】以下、本発明のガス切断方法に従い、純度９
２％のＰＳＡ酸素を使用して予熱炎を形成させて鋼板の
ガス切断を行ない、従来の方法と比較した例を示す。以
下の実施例においては、ＰＳＡ酸素発生装置として、特
願昭６１−２７３６３０号に記載された装置を用いた。EXAMPLES In the following, according to the gas cutting method of the present invention, a purity of 9 was obtained.
An example is shown in which a preheating flame is formed by using 2% PSA oxygen to perform gas cutting of a steel sheet, and the method is compared with a conventional method. In the following examples, the device described in Japanese Patent Application No. 61-273630 was used as the PSA oxygen generator.
【００２１】［実施例１］以下の条件でピアシングを行
った。被ピアシング材は、ＳＳ４１、１２tの鋼板を用
い、プロパン火口＃１、火口高さ１０ｍｍとした。予熱
用酸素としては、酸素純度９２％のＰＳＡ酸素あるいは
酸素純度９９．５％の高純度酸素を用い、流量は共に
１，０００Ｎｌ／Ｈ（１気圧０℃換算流量リットル／
時）とした。燃料ガスは共にプロパンガスを用い、その
流量は３００Ｎｌ／Ｈ（１気圧０℃換算流量リットル／
時）とし、切断酸素は共に酸素純度９９．５％の高純度
酸素を用い、その流量は３ｋｇ／ｃｍ2とした。得られ
た結果を表１に示す。表１で、×はピアシング不可、○
はピアシング可を表す。[Example 1] Piercing was performed under the following conditions. The pierced material was a steel plate of SS41, 12 t , and had a propane crater # 1 and a crater height of 10 mm. As preheating oxygen, PSA oxygen with an oxygen purity of 92% or high-purity oxygen with an oxygen purity of 99.5% was used, and the flow rates were both 1,000 Nl / H (1 atmospheric pressure 0 ° C conversion flow rate liter /
Time). Propane gas was used as the fuel gas, and the flow rate was 300 Nl / H (1 atmospheric pressure 0 ° C conversion flow rate liter /
And the cutting oxygen was high-purity oxygen with an oxygen purity of 99.5%, and the flow rate was 3 kg / cm 2 . Table 1 shows the obtained results. In Table 1, × means no piercing, ○
Indicates that piercing is possible.
【００２２】[0022]
【表１】 [Table 1]
【００２３】予熱用酸素の流量が等しい条件で比較する
と、予熱用酸素として純度９９．５％の高純度酸素を用
いた場合、４５秒でピアシングできたのに対して、予熱
用酸素として純度９２％のＰＳＡ酸素を用いた場合で
は、ピアシングに５５秒かかり、１０秒ほどピアシング
時間が長くなった。この１０秒ほどの切断効率の低下
は、燃料ガス流量を７〜８％増加させ、予熱用酸素流量
を７〜８％増加させることで解決できることがわかっ
た。Comparing under the condition that the flow rates of the preheating oxygen are equal, when high purity oxygen of 99.5% purity was used as the preheating oxygen, piercing was possible in 45 seconds, whereas the purity of the preheating oxygen was 92. When using% PSA oxygen, piercing took 55 seconds and piercing time was extended by about 10 seconds. It was found that the reduction of the cutting efficiency of about 10 seconds can be solved by increasing the fuel gas flow rate by 7 to 8% and increasing the preheating oxygen flow rate by 7 to 8%.
【００２４】［実施例２］以下の条件で、自動切断を行
った。被切断材は、ＳＳ４１、１２t、２５tの鋼板を用
い、プロパン火口＃１、＃２、火口高さ１０ｍｍとし
た。予熱用酸素としては、酸素純度９２％のＰＳＡ酸素
あるいは酸素純度９９．５％の高純度酸素を用い、流量
は共に１，０００Ｎｌ／Ｈとした。燃料ガスは共にプロ
パンガスを用い、その流量は３００Ｎｌ／Ｈとし、切断
酸素は共に酸素純度９９．５％の高純度酸素を用い、そ
の流量は３．２ｋｇ／ｃｍ2とした。Example 2 Automatic cutting was performed under the following conditions. The material to be cut was a steel plate of SS41, 12 t , and 25 t , and had propane craters # 1 and # 2 and a crater height of 10 mm. As preheating oxygen, PSA oxygen with an oxygen purity of 92% or high-purity oxygen with an oxygen purity of 99.5% was used, and the flow rates were both 1,000 Nl / H. Propane gas was used as the fuel gas, the flow rate was 300 Nl / H, and the cutting oxygen was high-purity oxygen with an oxygen purity of 99.5%, and the flow rate was 3.2 kg / cm 2 .
【００２５】切断結果の判定では、主として酸素、純度
の低下が予熱力の低下ひいてはルーズカットをおこさな
いかを見た。得られた結果を表２に示す。表２におい
て、切断結果の判定は、（社）日本溶接協会が定めたガ
ス切断面標準片に基づく評価の等級で１級、２級、３級
を表したもので、１級→３級に従い、評価が低下するも
のであり、１は１級、２は２級、３は３級を示す。In the determination of the cutting result, it was checked whether the decrease in oxygen and the purity caused a decrease in the preheating force and thus the loose cut. Table 2 shows the obtained results. In Table 2, the judgment of the cutting result indicates the grade 1, grade 2, and grade 3 based on the gas cut standard piece set by the Japan Welding Association (Company) according to grade 1 → grade 3. , The evaluation is lowered, 1 indicates 1st grade, 2 indicates 2nd grade, and 3 indicates 3rd grade.
【００２６】[0026]
【表２】 [Table 2]
【００２７】板厚１２t、２５tの鋼板を５００ｍｍ／ｍ
ｉｎの切断速度で切断する条件自体が、従来法において
も、ルーズカットが起こり得る切断条件であったが、本
発明の方法に従って予熱用酸素にＰＳＡ酸素を用いて
も、ルーズカットが起こらず、高純度酸素を用いた従来
方法と比較して切断結果に差はなかった。また上縁のノ
ロ、スラグの付着状態、切断面で比較しても本発明の方
法と従来方法とでは差はなく、走り出してしまえば差は
ないことがわかった。A steel plate having a plate thickness of 12 t and 25 t is 500 mm / m.
The condition itself for cutting at the cutting speed of in was the cutting condition in which loose cut could occur even in the conventional method, but even if PSA oxygen was used as preheating oxygen according to the method of the present invention, loose cut did not occur, There was no difference in the cutting results as compared with the conventional method using high-purity oxygen. Further, it was found that there is no difference between the method of the present invention and the conventional method even when comparing the adhered state of the upper edge, the adhered state of slag, and the cut surface, and there is no difference after running.
【００２８】ＰＳＡ酸素と高純度酸素の経済性を具体的
に比較すると、単価は１０ｍ3／時ＰＳＡの場合ＰＳＡ
酸素は約１００円／ｍ3、９９．５％の高純度酸素が約
２００円／ｍ3である。上記自動切断の実施例により、
予熱用酸素は、ＰＳＡ酸素、高純度酸素ともに１，００
０リットル／Ｈとして、同等の切断効率が得られること
がわかったので、本発明のガス切断方法においては、切
断効率を維持しつつ、大幅なコスト低減が可能であるこ
とが明らかになった。またピアシングにおいて、従来法
と同等の切断効率を得るために流量を若干増加させて
も、コスト低減効果は維持されることも明かである。A concrete comparison of the economics of PSA oxygen and high-purity oxygen shows that the unit price is 10 m 3 / hour PSA and PSA
Oxygen is about 100 yen / m 3 , and high purity oxygen of 99.5% is about 200 yen / m 3 . According to the example of the automatic cutting,
Preheat oxygen is PSA oxygen and high-purity oxygen of 1.00
Since it was found that the same cutting efficiency was obtained at 0 liter / H, it became clear that the gas cutting method of the present invention can significantly reduce the cost while maintaining the cutting efficiency. In piercing, it is also clear that the cost reduction effect is maintained even if the flow rate is slightly increased to obtain the cutting efficiency equivalent to that of the conventional method.
【００２９】以上、ガス切断法における予熱炎形成にお
いて、ＰＳＡ酸素とプロパンガスを用いた例（酸素プロ
パン切断法）を示したが、同様に酸素アセチレン切断法
にもＰＳＡ酸素を用いることができ、またパウダ切断法
における予熱炎形成にもＰＳＡ酸素を用いることができ
る。As described above, in the preheating flame formation in the gas cutting method, the example using PSA oxygen and propane gas (oxygen propane cutting method) is shown. Similarly, PSA oxygen can be used in the oxygen acetylene cutting method, PSA oxygen can also be used for preheating flame formation in the powder cutting method.
【００３０】[0030]
【発明の効果】以上説明したように本発明によれば、酸
素と燃料ガスを混合して予熱炎を形成しつつ、酸素の噴
流によって切断を行うガス切断方法およびガス切断装置
において、予熱用酸素として、ＰＳＡで発生させた酸素
ガスを用いるので、ガス切断方法のランニングコストを
大幅に低減することができ、しかも切断効率の点で従来
法に匹敵するガス切断を行うことができる。As described above, according to the present invention, in the gas cutting method and the gas cutting apparatus for cutting by the jet of oxygen while forming the preheating flame by mixing oxygen and fuel gas, the preheating oxygen is used. As the oxygen gas generated by PSA is used, the running cost of the gas cutting method can be significantly reduced, and the gas cutting can be performed in comparison with the conventional method in terms of cutting efficiency.
【図１】本発明のガス切断方法に好適に用いられるガス
切断装置のフローを示す図である。FIG. 1 is a diagram showing a flow of a gas cutting apparatus suitably used for a gas cutting method of the present invention.
【図２】従来のガス切断方法に用いられるガス切断装置
のフローを示す図である。FIG. 2 is a diagram showing a flow of a gas cutting device used in a conventional gas cutting method.
４ 燃料ガス導入管 ５ 予熱炎 ６ 酸素噴流 ７ トーチ ８ 予熱用酸素導入管 ９ 切断酸素導入管 １３ プレッシャースイング吸着（ＰＳＡ）酸素発生装
置 Ｂ ガス切断装置4 Fuel gas introduction pipe 5 Preheating flame 6 Oxygen jet 7 Torch 8 Preheating oxygen introduction pipe 9 Cutting oxygen introduction pipe 13 Pressure swing adsorption (PSA) oxygen generator B Gas cutting device
Claims (4)
し切断すべき鋼板を予熱した後、酸素を噴流して切断を
行うガス切断方法において、 予熱炎形成用酸素として、プレッシャースイング吸着法
によって発生させた酸素ガスを用いることを特徴とする
ガス切断方法。1. A gas cutting method in which oxygen and a fuel gas are mixed to form a preheating flame to preheat a steel sheet to be cut, and then the cutting is performed by jetting oxygen, wherein pressure swing adsorption is used as oxygen for forming the preheating flame. A gas cutting method characterized by using oxygen gas generated by the method.
％の範囲であることを特徴とする請求項１のガス切断方
法。2. The oxygen purity of the preheating oxygen is 90 to 95.5.
The gas cutting method according to claim 1, which is in a range of%.
Ｎｌ／時、燃料ガスの流量が３００〜９８０Ｎｌ／時で
あることを特徴とする請求項１または２のガス切断方
法。3. The flow rate of preheating oxygen is 1000 to 3200.
The gas cutting method according to claim 1 or 2, wherein the flow rate of the fuel gas is 300 to 980 Nl / hour at Nl / hour.
用酸素導入管と、予熱炎形成用燃料ガスを導入するため
の燃料ガス導入管と、酸素噴流形成のための切断用酸素
を導入する切断酸素導入管と、これらの導入管の下流に
接続され、予熱炎と酸素噴流を形成するためのトーチを
備えたガス切断機において、 予熱用酸素導入管の上流に、プレッシャースイング吸着
酸素発生装置が接続されていることを特徴とするガス切
断装置。4. A preheating oxygen introducing pipe for introducing preheating flame forming oxygen, a fuel gas introducing pipe for introducing preheating flame forming fuel gas, and a cutting oxygen for forming oxygen jet flow. In a gas cutting machine equipped with cutting oxygen introducing pipes and a torch for forming a preheating flame and an oxygen jet, which is connected downstream of these introducing pipes, a pressure swing adsorption oxygen is generated upstream of the preheating oxygen introducing pipe. A gas cutting device characterized in that the device is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17118895A JPH0919765A (en) | 1995-07-06 | 1995-07-06 | Gas cutting method and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17118895A JPH0919765A (en) | 1995-07-06 | 1995-07-06 | Gas cutting method and its device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0919765A true JPH0919765A (en) | 1997-01-21 |
Family
ID=15918642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17118895A Pending JPH0919765A (en) | 1995-07-06 | 1995-07-06 | Gas cutting method and its device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0919765A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008049349A (en) * | 2006-08-22 | 2008-03-06 | Taiyo Nippon Sanso Corp | Gas cutting method |
| CN104308322A (en) * | 2014-09-27 | 2015-01-28 | 江苏恒泽安装工程股份有限公司 | Air circuit system for flame cutting of numerically-controlled pipe intersecting cutting machine |
| JP2020189301A (en) * | 2019-05-17 | 2020-11-26 | 日本製鉄株式会社 | Method for manufacturing steel material |
-
1995
- 1995-07-06 JP JP17118895A patent/JPH0919765A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008049349A (en) * | 2006-08-22 | 2008-03-06 | Taiyo Nippon Sanso Corp | Gas cutting method |
| CN104308322A (en) * | 2014-09-27 | 2015-01-28 | 江苏恒泽安装工程股份有限公司 | Air circuit system for flame cutting of numerically-controlled pipe intersecting cutting machine |
| JP2020189301A (en) * | 2019-05-17 | 2020-11-26 | 日本製鉄株式会社 | Method for manufacturing steel material |
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