JP4533206B2 - Lubricant supply method in hot rolling - Google Patents
Lubricant supply method in hot rolling Download PDFInfo
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本発明は，鉄鋼製造プロセスにおける熱間圧延工程での潤滑剤の供給方法に関する。 The present invention relates to a method for supplying a lubricant in a hot rolling process in a steel manufacturing process.
潤滑熱延を実施する目的は，圧延中の摩擦力を低減することによってロールの摩耗を減らし，省エネルギー効果を得たり，製品の表面品質を向上させたりと様々である。熱間圧延における潤滑油供給方法としては，例えば，非特許文献１に記載されているように，水に潤滑油を混合してエマルションの形態で噴射供給する方法の他に，潤滑油と水蒸気とを混合して噴射供給する方法（スチームアトマイズ方式）が知られている。 The purpose of lubrication hot rolling is various, such as reducing the wear of the roll by reducing the friction force during rolling, obtaining energy saving effect, and improving the surface quality of the product. As a lubricating oil supply method in hot rolling, for example, as described in Non-Patent Document 1, in addition to a method of mixing lubricating oil with water and injecting and supplying it in the form of an emulsion, lubricating oil and steam There is known a method (steam atomization system) for mixing and supplying the mixture.
また，板厚の均一性に優れた深絞り用熱延鋼板の製造方法として，潤滑油の供給量をロール表面積１ｍ２あたり０．２〜１０ｃｍ３供給することを骨子とした特許文献１，特許文献２および特許文献３が公知である。これらの公知文献による方法は，水と潤滑油とをウォーターインジェクションによって混合したエマルション潤滑法である。 Further, as a method for producing a hot-rolled steel sheet for deep drawing having excellent thickness uniformity, Patent Document 1 and Patent which are based on supplying a lubricant supply amount of 0.2 to 10 cm 3 per 1 m 2 of roll surface area. Document 2 and Patent Document 3 are known. These known methods are emulsion lubrication methods in which water and lubricating oil are mixed by water injection.
エマルション潤滑法を用いる場合，ロール冷却水が潤滑供給部にかからないように水切りワイパーがロール冷却水供給部と潤滑供給部との間に設けられている。しかし，ロールが回転してワイパーが摩耗し隙間があくことによって，ロール冷却水が潤滑供給部に洩れだしてくると，エマルション潤滑で供給された潤滑油はロールへ付着しにくくなる。これは，洩れだしたロール冷却水がロール表面に水膜を形成するためであり，さらにこの冷却水と混じることによってエマルション濃度（水に対する潤滑油の量）が下がり，潤滑効果が得られにくくなるからである。なお，同様の問題がスチームアトマイズ方式にも生じることがわかっている。 When the emulsion lubrication method is used, a drain wiper is provided between the roll cooling water supply unit and the lubrication supply unit so that the roll cooling water is not applied to the lubrication supply unit. However, when the roll rotates and the wiper wears and there is a gap, if the roll cooling water leaks into the lubrication supply section, the lubricating oil supplied by emulsion lubrication becomes difficult to adhere to the roll. This is because the leaked roll cooling water forms a water film on the roll surface, and when mixed with this cooling water, the emulsion concentration (the amount of lubricating oil with respect to water) decreases, making it difficult to obtain a lubricating effect. Because. It is known that the same problem occurs in the steam atomization method.
また，エマルション潤滑では，気温や湿度の変化による潤滑油の粘度の微妙な違いによって，エマルション濃度が常に変化している。これにより，潤滑配管システム内の汚れやノズルの詰まりが生じ，さらにそれらの外的要因によって，潤滑効果にバラツキが生じる問題も認識されている。 In emulsion lubrication, the emulsion concentration always changes due to subtle differences in the viscosity of the lubricating oil due to changes in temperature and humidity. As a result, dirt in the lubrication piping system and clogging of the nozzles are caused, and a problem that the lubrication effect varies due to these external factors is also recognized.
これに対し，例えば特許文献４には，４０℃における粘度が８ｃｍ２／ｓ以下の潤滑油を，平均粒径が５ｍｍ以下の粒状にして，潤滑ノズル１本あたりにつき，水と混合せずに毎分１０００ｃｍ３以上の流量の不燃性ガスとともに，ロールに噴射供給する潤滑剤供給方法が開示されている（以下，ガスアトマイズ供給法と記す）。この潤滑剤供給方法では，ロールに多少水膜が残っていても，供給されたガスによってロール表面上の水膜を吹き飛ばすので，潤滑剤が確実にロール表面に到達して付着し，潤滑剤の種々の効果を効率的に導き出すことが可能である。 On the other hand, for example, in Patent Document 4, a lubricating oil having a viscosity at 40 ° C. of 8 cm 2 / s or less is granulated with an average particle diameter of 5 mm or less, and is not mixed with water per lubricating nozzle. A lubricant supply method for injecting and supplying to a roll together with a non-combustible gas having a flow rate of 1000 cm 3 or more per minute is disclosed (hereinafter referred to as a gas atomization supply method). In this lubricant supply method, even if some water film remains on the roll, the supplied gas blows off the water film on the roll surface, so that the lubricant reliably reaches the roll surface and adheres to it. Various effects can be efficiently derived.
しかしながら，潤滑剤として引火性の高い潤滑油を使用する場合，噴射した潤滑剤が鋼材からの輻射熱で発火したり，圧延設備周辺に堆積した潤滑油が発火したりするおそれがある，という問題があった。 However, when a highly flammable lubricant is used as the lubricant, there is a problem that the injected lubricant may be ignited by radiant heat from the steel material, or the lubricant accumulated around the rolling equipment may be ignited. there were.
そこで，本発明は，このような問題に鑑みてなされたもので，その目的は，ガスアトマイズ供給法において，従来のエマルション潤滑剤供給法で問題とならなかった潤滑油の発火を防止しつつ，優れた潤滑効果を得ることが可能な，新規かつ改良された潤滑油供給方法を提供するものである。 Therefore, the present invention has been made in view of such problems, and the object thereof is excellent in the gas atomization supply method while preventing ignition of the lubricating oil, which has not been a problem in the conventional emulsion lubricant supply method. The present invention provides a new and improved lubricating oil supply method capable of obtaining a lubricating effect.
本発明者は，上記課題を解決するために，熱間圧延における潤滑方法や潤滑剤引火防止方法について鋭意研究を重ねた結果，潤滑剤を供給するロールの表面に，所定の厚みの水膜を存在させておくことにより，引火性の高い潤滑油をガスアトマイズ供給法で噴射供給しても，潤滑効果，すなわち摩擦係数低減効果を維持でき，噴射した潤滑油の発火現象も防止できることを見出し，この知見に基づいて本発明を完成するに至った。 In order to solve the above problems, the present inventor has conducted extensive research on a lubrication method and a lubricant ignition prevention method in hot rolling. As a result, a water film having a predetermined thickness is formed on the surface of a roll for supplying the lubricant. It has been found that, even if a highly flammable lubricating oil is injected and supplied by the gas atomization supply method, the lubricating effect, that is, the friction coefficient reducing effect can be maintained, and the ignition phenomenon of the injected lubricating oil can be prevented. The present invention has been completed based on the findings.
すなわち，本発明の要旨は，以下のとおりである。
（１）４０℃における粘度が８ｃｍ２／ｓ以下の潤滑油を，平均粒径が５ｍｍ以下の粒状にして，不燃性ガスとともに，ロールに噴射供給する熱間圧延における潤滑剤供給方法において，潤滑剤が噴射される入側ロール表面に，潤滑剤を噴射させていないときに平均１０μｍ以上の厚みの水膜を形成できる量に相当する量の水を供給しながら，その供給場所に潤滑剤を噴射供給することを特徴とする，熱間圧延における潤滑剤供給方法。
（２）入側ロール表面に形成される水膜の厚みまたは入側ロール表面に供給される水量に応じて，噴射する潤滑剤の供給量及び／又は不燃性ガスの流量を制御することを特徴とする，（１）に記載の潤滑剤供給方法。
That is, the gist of the present invention is as follows.
(1 ) In a lubricant supply method in hot rolling in which a lubricating oil having a viscosity at 40 ° C. of 8 cm 2 / s or less is granulated with an average particle size of 5 mm or less and supplied to a roll together with a nonflammable gas, While supplying an amount of water corresponding to an amount capable of forming a water film having an average thickness of 10 μm or more when the lubricant is not sprayed on the entry side roll surface where the agent is sprayed, the lubricant is supplied to the supply location. A method for supplying a lubricant in hot rolling, characterized by being supplied by injection.
( 2 ) The supply amount of the lubricant to be injected and / or the flow rate of the incombustible gas is controlled in accordance with the thickness of the water film formed on the surface of the entrance side roll or the amount of water supplied to the surface of the entrance side roll. The lubricant supply method according to (1 ) .
上記（２）における制御は，例えば，入側ロール表面に平均１０μｍ以上の厚みの水膜が形成される場合または相当量の水が入側ロール表面に供給される場合には，不燃性ガスの流量は，潤滑ノズル１本あたりにつき，毎分１０００ｃｍ３以上とすると，潤滑剤の引火が起こらず，効率的な潤滑圧延も可能となる。
The control in the above ( 2 ) is, for example , when a water film having an average thickness of 10 μm or more is formed on the inlet roll surface or when a considerable amount of water is supplied to the inlet roll surface. If the flow rate is 1000 cm 3 or more per one lubrication nozzle, the lubricant does not ignite and efficient lubrication rolling is possible.
本発明によれば，ガスアトマイズ供給法において，高温環境下であっても，潤滑剤の引火，さらには火災事故が起こらないようにして，効率的な潤滑圧延が可能になる。また，潤滑圧延の安定化が達成されることで，電力源単位の低減やそれに伴う二酸化炭素排出量の削減に対する貢献，ロール肌荒れや摩耗の抑制が期待できる。 According to the present invention, in the gas atomization supply method, even in a high temperature environment, the lubricant can be ignited and an efficient lubrication rolling can be performed without causing a fire accident. In addition, the stabilization of lubricated rolling can be expected to contribute to the reduction of power source units and the resulting reduction of carbon dioxide emissions, and to suppress rough rolls and wear.
以下に添付図面を参照しながら，本発明の好適な実施の形態について詳細に説明する。なお，本明細書及び図面において，実質的に同一の機能構成を有する構成要素については，同一の符号を付することにより重複説明を省略する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.
図１に基づいて，本実施形態に係る潤滑油の供給方法について説明する。なお，図１は，本発明の一実施形態に係る潤滑剤供給方法に用いる４重圧延機の概略的な構成を示した説明図である。 Based on FIG. 1, a method for supplying lubricating oil according to the present embodiment will be described. In addition, FIG. 1 is explanatory drawing which showed schematic structure of the quadruple rolling mill used for the lubricant supply method which concerns on one Embodiment of this invention.
図１に示すように，通常，潤滑油の供給は圧延機の入側で行われる。圧延機の入側にはロール冷却用の冷却水ヘッダー６が設置されており，その冷却水が被圧延材５にかからないように，上ロール（上ワークロール３）では冷却水ヘッダー６の下に，下ロール（下ワークロール４）では冷却水ヘッダー６ーの上にロール表面の水をはき出す水切りワイパー７が取り付けられている。下ロールでは，供給されたロール冷却水がロールの回転によって上方へ持って行かれるため，図１のような配置となっている。冷却水ヘッダー６は，ロールの軸方向に所定の間隔で配置されたノズルを備えており，ロール全体に冷却水や潤滑油を同時に噴射供給できるようにするものである。水切りワイパー７は，ロール冷却水が被圧延材５にかかって，被圧延材５が冷却されて所望の材質特性に作り込めなかったり，変形抵抗が増大して圧延負荷が大きくなるのを防いだりするために設けられている。 As shown in FIG. 1, the lubricating oil is usually supplied at the entrance of the rolling mill. A cooling water header 6 for cooling the roll is installed on the entrance side of the rolling mill. The upper roll (upper work roll 3) is below the cooling water header 6 so that the cooling water does not reach the material 5 to be rolled. In the lower roll (lower work roll 4), a draining wiper 7 is attached on the cooling water header 6 to expel the water on the roll surface. In the lower roll, since the supplied roll cooling water is taken upward by the rotation of the roll, the arrangement is as shown in FIG. The cooling water header 6 is provided with nozzles arranged at predetermined intervals in the axial direction of the roll, so that cooling water and lubricating oil can be simultaneously injected and supplied to the entire roll. The draining wiper 7 prevents the roll cooling water from being applied to the material 5 to be rolled, so that the material 5 to be rolled is cooled and cannot be formed into desired material characteristics, or the deformation resistance is increased and the rolling load is increased. Is provided to do.
潤滑油を噴射する潤滑剤ヘッダー８は，通常，上ロールでは水切りワイパー７の下に，下ロールでは水切りワイパー７の上に設置される。このように配置することによって，ロール表面上に水膜が存在しない状態で，従来の潤滑剤（エマルション潤滑剤）を供給することができ，エマルションでもある程度の潤滑油の付着効果を得ることができ，これにより，圧延荷重の低減やロール摩耗の低減などの潤滑効果を得ることができる。エマルション潤滑剤は，引火性の潤滑油が水に強制的に攪拌・混合されたものであるので，水によって潤滑油の温度上昇を防ぎ，火災トラブルを引き起こすことはない。本実施形態では，ガスアトマイズ供給法を使用し，潤滑油が直接ワークロール３，４に供給されるため，優れた潤滑効果が得られることは公知であるが，熱間鋼材の近くで引火性の潤滑油そのものを噴射供給するので，火災トラブルの発生が懸念される。 The lubricant header 8 for injecting the lubricating oil is usually installed below the draining wiper 7 for the upper roll and above the draining wiper 7 for the lower roll. By arranging in this way, a conventional lubricant (emulsion lubricant) can be supplied in the state where there is no water film on the roll surface, and a certain level of lubricating oil adhesion effect can be obtained even in an emulsion. Thus, it is possible to obtain a lubricating effect such as reduction of rolling load and reduction of roll wear. Emulsion lubricants are those in which flammable lubricant is forcibly stirred and mixed with water, so water prevents temperature rise of the lubricant and does not cause fire trouble. In this embodiment, it is known that an excellent lubrication effect can be obtained because the lubricating oil is directly supplied to the work rolls 3 and 4 by using the gas atomizing supply method, but the flammability is close to the hot steel material. There is a concern about fire troubles because the lubricant itself is supplied by injection.
本発明者は，ロール表面に水膜を形成させた状態で，この水膜の上から，ガスアトマイズ供給法によって潤滑油を供給する方法を見出した。具体的には，ワークロール３，４の表面に水膜を形成させた際に，水切りワイパー７とワークロール３，４の表面との間に若干の隙間ができるように水切りワイパー７の位置を調整し，冷却水ヘッダー６からのロール冷却水の一部がワークロール３，４の表面に残るようにして形成した。このような状態でガスアトマイズ供給法によって潤滑油を供給すると，潤滑剤ヘッダー８から噴射されたガス流によって，潤滑油をワークロール３，４表面に運搬すると同時に，ワークロール３，４表面の水膜を吹き飛ばす効果がある。さらに，吹き飛ばされた水がワークロール３，４表面上の潤滑油供給部（ロール表面上の潤滑油が供給される部分）と熱間鋼材との間の熱遮蔽効果を生み出し，潤滑油の温度上昇を抑制する。また，吹き飛ばされた水がワークロール３，４表面に付着した潤滑油膜の上に付着し，ワークロール３，４表面上の潤滑油膜の温度上昇も抑制することができる。 The present inventor has found a method of supplying lubricating oil from above the water film by a gas atomizing supply method in a state where the water film is formed on the roll surface. Specifically, when the water film is formed on the surfaces of the work rolls 3 and 4, the position of the drainage wiper 7 is set so that a slight gap is formed between the draining wiper 7 and the surface of the work rolls 3 and 4. It adjusted and formed so that a part of roll cooling water from the cooling water header 6 might remain on the surface of the work rolls 3 and 4. When lubricating oil is supplied by the gas atomizing supply method in such a state, the lubricating oil is transported to the surface of the work rolls 3 and 4 by the gas flow injected from the lubricant header 8, and at the same time, the water film on the surface of the work rolls 3 and 4 There is an effect to blow away. Further, the blown water creates a heat shielding effect between the lubricating oil supply part on the surface of the work rolls 3 and 4 (the part where the lubricating oil is supplied on the roll surface) and the hot steel material, and the temperature of the lubricating oil Suppresses the rise. Further, the blown water adheres onto the lubricating oil film adhering to the surfaces of the work rolls 3 and 4, and the temperature rise of the lubricating oil film on the surfaces of the work rolls 3 and 4 can be suppressed.
このような効果は，ワークロール３，４表面に形成された水膜の厚みが，平均で１０μｍ以上の厚みでないと得られず，２０μｍ以上であればほぼ十分に上記遮断効果が得られる。水膜の厚みが平均で１０μｍよりも薄いと，熱間鋼材からの輻射熱によって潤滑油の発火を防止するのに十分な遮蔽効果が得られない。水膜の厚みが厚くなる場合には，ガスアトマイズ供給法の潤滑油やガスの供給量を多くすることによって，潤滑効果の低下を引き起こすことなく，熱間鋼材からの輻射熱を遮蔽する効果を得ることができる。 Such an effect cannot be obtained unless the average thickness of the water film formed on the surfaces of the work rolls 3 and 4 is 10 μm or more. If the thickness is 20 μm or more, the above-described blocking effect can be obtained sufficiently. If the thickness of the water film is thinner than 10 μm on average, a sufficient shielding effect for preventing the ignition of the lubricating oil due to the radiant heat from the hot steel material cannot be obtained. When the thickness of the water film increases, the effect of shielding the radiant heat from the hot steel material can be obtained without increasing the lubrication effect by increasing the supply amount of the lubricating oil and gas in the gas atomization supply method. Can do.
一方，水膜の厚みが３０００μｍを超えると，吹き飛ばされた水膜によって潤滑油が希釈されるおそれがある。また，コスト的にも無駄な潤滑油を供給することになるので，３０００μｍ超は好ましくない。したがって，好ましくは，ワークロール３，４表面に形成する水膜の厚みは，平均で２０μｍ以上３０００μｍ以下であり，さらに好ましくは２０μｍ以上１０００μｍ以下である。ロール表面上に局所的に水膜が存在しない部分が生じても，平均で１０μｍ以上の水膜がワークロール３，４表面に形成されていれば，ガスアトマイズ供給法によるガス流によって水膜が存在しない部分にも水が供給され，ワークロール３，４表面全体に一様な厚みの水膜が潤滑油供給前に形成されるのと同じ効果がある。 On the other hand, if the thickness of the water film exceeds 3000 μm, the lubricating oil may be diluted by the blown water film. Further, since it is necessary to supply useless lubricating oil in terms of cost, it is not preferable to exceed 3000 μm. Therefore, the thickness of the water film formed on the surfaces of the work rolls 3 and 4 is preferably 20 μm or more and 3000 μm or less on average, and more preferably 20 μm or more and 1000 μm or less. Even if there is a part where no water film exists locally on the roll surface, if a water film of 10 μm or more is formed on the surface of the work rolls 3 and 4 on average, a water film exists due to the gas flow by the gas atomization supply method. Water is also supplied to the non-applied portion, and the same effect is obtained as when a water film having a uniform thickness is formed on the entire surface of the work rolls 3 and 4 before the lubricating oil is supplied.
水膜は，上述したような水切りワイパー７とワークロール３，４の表面との間に隙間を設けることによって形成する方法だけでなく，水膜を形成するために用いる水膜形成ヘッダーを別途設置して，この水膜形成ヘッダーからワークロール３，４表面に水を吹き付けることによっても形成することが可能である。このように，ワークロール表面上の潤滑油供給部と熱間鋼材との間の熱遮断効果が得られるような水膜の厚みが実現できれば，水膜を形成する手段はどのようなものであってもよい。 The water film is not only formed by providing a gap between the draining wiper 7 and the surfaces of the work rolls 3 and 4 as described above, but a water film forming header used for forming the water film is separately installed. And it can also form by spraying water on the work rolls 3 and 4 surface from this water film formation header. Thus, what is the means for forming the water film as long as the water film thickness can be realized so as to obtain a heat shielding effect between the lubricating oil supply section on the work roll surface and the hot steel material? May be.
さらに，ワークロール３，４表面に水膜を形成させる部位と，ガスアトマイズ供給法で潤滑油を供給する部位とが重なってもよい。重なって供給された場合でも，平均１０μｍ以上の厚みの水膜を形成できる量の水が供給されれば，結果的に水膜の厚みが１０μｍ未満であっても，上述した火災トラブル防止効果が得られる。すなわち，熱間鋼材からの輻射熱を遮断するのに十分な水量が入り側に供給されれば，必ずしも，潤滑油供給時の膜厚は１０μｍ以上でなくても構わない。 Furthermore, the site | part which forms a water film on the work rolls 3 and 4 surface, and the site | part which supplies lubricating oil with a gas atomization supply method may overlap. Even if the water is supplied in an overlapping manner, if the amount of water that can form a water film having an average thickness of 10 μm or more is supplied, the above-described fire trouble prevention effect can be achieved even if the water film has a thickness of less than 10 μm. can get. That is, as long as a sufficient amount of water is supplied to the inlet side to block the radiant heat from the hot steel material, the film thickness at the time of supplying the lubricant does not necessarily have to be 10 μm or more.
（実施例１）
２ＨＩコイル圧延実験装置に，ガスアトマイズ潤滑供給装置を設置して潤滑圧延実験を行った。ロール水膜の厚みを変化させて，潤滑ＯＮ／ＯＦＦ時の摩擦係数の変化や潤滑供給時の発火現象発生の有無を調査した。使用したロールは，ＳＫＤ５１材の直径４００ｍｍ，胴長１００ｍｍの大きさのもので，被圧延材はＳＰＣＣ材の厚み１ｍｍ，幅５０ｍｍ，長さ１０６ｍｍのコイルであった。入側コイラーは加熱炉になっており，窒素雰囲気下で１０００℃に加熱してから圧延実験を行った。圧延速度は１００ｍｍｉｎとし，加速及び減速時は潤滑供給せずに行い，定常速度に達してから種々の条件で実験を実施した。入出側の板張力は約１〜４ｋｇｆ/ｍｍ２程度で実施した。圧下率は約２５％になるようにロールギャップを設定した。通常の熱間圧延実験では，圧延機の出側からロール冷却水をかけるだけであるが，今回の実験では，潤滑効果や潤滑油引火有無の調査のため，潤滑剤供給用のノズルから噴射・供給された潤滑剤がワークロールに当たる部分（潤滑剤供給部）の上下に別途ロール水膜形成専用のノズルを設けた。２ＨＩ圧延機であるため，出側でかけたロール冷却水の一部がロールの回転によって入側に回り込んでくる。この水の回り込みを防ぐために出側のロール冷却水供給部と，別途設けた水膜形成用ノズルによって水が供給される部位との間に，水切りワイパーを取り付けた。これによって，図１に示した実機の冷却水ヘッダー，水切りワイパーおよび潤滑剤ヘッダーの位置関係と同じ状況を再現した実験を実施できるようになった。ワークロール表面に形成させる水膜厚みの設定は，別途設けた水膜形成専用のノズルからの水の流量を調整することによって行った。供給された水がすべてロール表面に付着する場合の水膜の厚みとノズルからの水供給量との間には，下記式（１）の関係が成立する。ただし，下記式（１）は，ロール胴長の方がスプレーコーンの広がり幅よりも長い場合に成立する。
Example 1
A lubrication rolling experiment was conducted by installing a gas atomized lubrication supply device in the 2HI coil rolling experiment device. By changing the thickness of the roll water film, the friction coefficient at the time of lubrication ON / OFF and the occurrence of ignition phenomenon at the time of lubrication supply were investigated. The roll used was a SKD51 material having a diameter of 400 mm and a body length of 100 mm, and the material to be rolled was a coil of SPCC material having a thickness of 1 mm, a width of 50 mm, and a length of 10 6 mm. The inlet coiler is a heating furnace, and the rolling experiment was conducted after heating to 1000 ° C. in a nitrogen atmosphere. The rolling speed was set to 100 mm, and lubrication was not supplied during acceleration and deceleration, and experiments were performed under various conditions after reaching a steady speed. The plate tension on the entry / exit side was about 1 to 4 kgf / mm 2 . The roll gap was set so that the reduction ratio was about 25%. In normal hot rolling experiments, roll cooling water is only applied from the exit side of the rolling mill, but in this experiment, injection / Separately, a roll water film forming nozzle was provided above and below the portion (lubricant supply portion) where the supplied lubricant hits the work roll. Since it is a 2HI rolling mill, a part of the roll cooling water applied on the exit side goes around to the entry side by the rotation of the roll. In order to prevent this water from wrapping around, a draining wiper was attached between the roll cooling water supply section on the outlet side and a portion where water was supplied by a water film forming nozzle provided separately. As a result, it was possible to carry out an experiment reproducing the same situation as the positional relationship of the cooling water header, draining wiper and lubricant header of the actual machine shown in FIG. The thickness of the water film formed on the surface of the work roll was set by adjusting the flow rate of water from a separate nozzle dedicated to water film formation. The relationship of the following formula (1) is established between the thickness of the water film when all of the supplied water adheres to the roll surface and the amount of water supplied from the nozzle. However, the following formula (1) is established when the roll body length is longer than the spread width of the spray cone.
上記式（１）を用いて，所望の厚みのロール水膜が形成できる水量を水膜形成用ノズルから噴射してロール表面に水膜を形成させ，その上から潤滑油を種々の条件（ガス供給量，潤滑油供給量）で供給した。今回の実験で用いたノズルは，ロール表面でのスプレーコーンの広がり幅がロール胴長と同じものを使用した。潤滑効果の有無を判定する指標としては，摩擦係数を用いた。摩擦係数は，圧延実験中に測定された圧延荷重，圧延速度，入出側の板張力，出側板速度と圧延速度（ロール速度）とから得られる先進率，および圧下率の各データを用いて，Orowanの圧延理論を用いて求めた。また，潤滑供給中に潤滑油発火現象の有無は，板道内外もしくは圧延機周辺部で炎が発生して１秒以上燃え続けた場合を発火現象有りとして評価した。一方，炎が発生しても１秒以内に消えたものについては潤滑油発火現象無しとした。実験に用いた潤滑油は，実際の熱延工場で使用されているもので，４０℃における粘度が１．２ｃｍ２／ｓの鉱物油をベースとした市販の潤滑油であった。なお，この潤滑油は，鉱油及び／又はエステルをベース油とし，その中に種々の油性剤，極圧添加剤，減磨剤等が添加された市販の潤滑油である。 Using the above formula (1), the amount of water that can form a roll water film having a desired thickness is ejected from the water film forming nozzle to form a water film on the roll surface, and the lubricating oil is applied under various conditions (gas Supply amount, lubricating oil supply amount). The nozzle used in this experiment was the same as the roll barrel length in which the spray cone spreads on the roll surface. The coefficient of friction was used as an index for judging the presence or absence of the lubricating effect. The coefficient of friction is determined by using the rolling load, rolling speed, sheet tension on the entry / exit side, advanced rate obtained from the exit plate speed and rolling speed (roll speed), and rolling reduction data measured during the rolling experiment. Obtained using Orowan's rolling theory. In addition, the presence or absence of a lubricant igniting phenomenon during lubrication supply was evaluated as the presence of a igniting phenomenon when a flame was generated inside or outside the plate path or around the rolling mill and continued to burn for more than one second. On the other hand, if the flame disappeared within 1 second, it was determined that there was no lubricating oil ignition phenomenon. The lubricating oil used in the experiment was a commercially available lubricating oil based on a mineral oil having a viscosity of 1.2 cm 2 / s at 40 ° C., which is used in an actual hot rolling mill. This lubricating oil is a commercially available lubricating oil based on mineral oil and / or ester, to which various oil agents, extreme pressure additives, lubricants and the like are added.
実験結果を実験条件とともに下記表１に示した。条件No.１は潤滑を使用しないで圧延したときの摩擦係数を示す。この摩擦係数よりも小さい値であるほど潤滑効果に優れていることを意味する。条件No.２および３はロール表面の水膜厚みが薄い場合の例，つまり本発明の比較例として挙げたものである。この場合，潤滑効果は得られるものの潤滑油の発火現象が発生した。条件No.４から９は本発明の実施例であり，ロール表面の水膜厚が平均で１０μｍ以上であれば，潤滑油の発火現象は発生しなかった。また，ロール表面の水膜厚みが厚くなっても，潤滑油の供給量やガスアトマイズ供給する場合のガス供給量を増やすことによって，優れた潤滑効果を得ることができる。 The experimental results are shown in Table 1 below together with the experimental conditions. Condition No. 1 shows the coefficient of friction when rolling without using lubrication. A value smaller than this friction coefficient means that the lubricating effect is excellent. Conditions Nos. 2 and 3 are given as examples when the thickness of the water film on the roll surface is small, that is, as a comparative example of the present invention. In this case, although the lubricating effect was obtained, the ignition of the lubricating oil occurred. Conditions Nos. 4 to 9 are examples of the present invention. When the water film thickness on the roll surface averaged 10 μm or more, the ignition phenomenon of the lubricating oil did not occur. Even if the water film thickness on the roll surface is increased, an excellent lubrication effect can be obtained by increasing the supply amount of the lubricating oil and the gas supply amount when supplying the gas atomization.
また，表１の条件２から９について，水膜形成用水供給ノズルの向きを変えて，水膜形成用の水の供給場所と，潤滑供給場所とを同じにして，上記と同じ条件で実験を行ったところ，表２に示すように，表１記載の結果とほぼ同じ結果になった。このことから，ロール表面の水膜形成場所にかかわらず，水膜厚み換算で平均１０μｍ以上の水をロール表面に供給しながら，ガスアトマイズ供給法によって潤滑油を供給すれば，潤滑油の発火・引火による火災トラブルを引き起こすことなく，優れた潤滑効果を得ることができる，ということがわかった。 Also, for conditions 2 to 9 in Table 1, the direction of the water film forming water supply nozzle was changed, the water supply location for forming the water film was the same as the lubrication supply location, and the experiment was performed under the same conditions as above. As a result, as shown in Table 2, almost the same result as described in Table 1 was obtained. Therefore, regardless of where the water film is formed on the roll surface, if lubricating oil is supplied by the gas atomization method while supplying water with an average thickness of 10 μm or more to the roll surface in terms of water film thickness, ignition and ignition of the lubricating oil will occur. It was found that an excellent lubrication effect can be obtained without causing fire troubles.
（実施例２）
熱延工場の仕上圧延機の第５スタンド（全７スタンドのタンデム圧延機の５番目に設置されている４ＨＩ圧延機）の入側に既設の潤滑供給装置を改造してガスアトマイズ潤滑供給装置を設置して潤滑圧延を行った。水切りワイパーと潤滑剤ヘッダーとの間に，ロール表面に水膜を形成させるための水膜形成用水供給ヘッダーを別途設けて，この水膜形成用水供給ヘッダーの水供給量を変化させ，さらに式（１）を用いて，所定の厚みの水膜をロール表面に形成させるようにした。用いたノズルを使用した場合のロール表面におけるスプレーコーンの広がり幅は約３００ｍｍであった。また，この水膜形成用水供給ヘッダーは，供給方向を調整することができるようにして，予めロール表面に水膜を形成させて，その上からガスアトマイズ潤滑供給方法で潤滑油を供給した場合や，水膜形成用の水供給場所と潤滑供給場所とが同じになるようにした場合の両方のケースについて実験できるようにした。また，本発明の実用性を検証するために，潤滑を使用して圧延した場合と潤滑を使用しないで圧延した場合の摩擦係数の値で潤滑効果有無を判定し，供給された潤滑油の引火有無を観察して，火災トラブル回避の可否を調査した。摩擦係数は，実施例１と同様の計算で求めた。潤滑油の引火有無の判定も実施例１と同じ基準で判定した。潤滑油は４０℃における粘度が１．４２ｃｍ２／ｓの鉱物油をベースとした市販の潤滑油を使用した。ワークロールは，ハイスロール材で，直径６８３ｍｍ，胴長１８２０ｍｍであった。圧延材は０．３％低炭素鋼で，入側板厚は約７．５ｍｍ，板幅は約１１８０ｍｍであった。仕上圧延機の第１スタンドの入側における圧延材の温度は約９９０℃であった。圧延速度は定常圧延時で約５６０ｍｍｉｎで，圧下率約３５％で圧延を行った。入出側の板張力は，約０．５〜１．０ｋｇｆ／ｍｍ２に設定した。
(Example 2)
A gas atomized lubrication supply device was installed by modifying the existing lubrication supply device on the entrance side of the fifth stand of the finishing mill at the hot rolling mill (4HI rolling mill installed in the fifth of all seven tandem rolling mills). Then, lubrication rolling was performed. A water supply header for forming a water film for forming a water film on the roll surface is separately provided between the drainer wiper and the lubricant header, and the water supply amount of the water supply header for forming the water film is changed. Using 1), a water film having a predetermined thickness was formed on the roll surface. When the nozzle used was used, the spread width of the spray cone on the roll surface was about 300 mm. In addition, the water supply header for forming a water film can adjust the supply direction so that a water film is formed on the roll surface in advance and the lubricating oil is supplied from above by a gas atomized lubrication supply method. Experiments were conducted in both cases where the water supply location for forming a water film and the lubrication supply location were the same. Also, in order to verify the practicality of the present invention, the presence or absence of a lubrication effect is judged by the value of the friction coefficient when rolling is performed using lubrication and when rolling is performed without using lubrication, and the supplied lubricating oil is ignited. The existence of fire troubles was investigated by observing the presence or absence. The coefficient of friction was obtained by the same calculation as in Example 1. Whether or not the lubricating oil was ignited was also determined based on the same criteria as in Example 1. As the lubricating oil, a commercially available lubricating oil based on a mineral oil having a viscosity at 40 ° C. of 1.42 cm 2 / s was used. The work roll was a high-speed roll material having a diameter of 683 mm and a trunk length of 1820 mm. The rolled material was 0.3% low carbon steel, the entry side plate thickness was about 7.5 mm, and the plate width was about 1180 mm. The temperature of the rolled material on the entry side of the first stand of the finishing mill was about 990 ° C. The rolling speed was about 560 mm at the time of steady rolling, and rolling was performed at a reduction rate of about 35%. The plate tension on the entry / exit side was set to about 0.5 to 1.0 kgf / mm 2 .
実験結果を実験条件とともに表３に示した。条件No.１は，潤滑を使用しないで圧延したときの摩擦係数を示す。この摩擦係数よりも小さい値であるほど潤滑効果に優れていることを意味する。条件No.２はロール表面の水膜厚みが薄い場合の例，つまり，本発明の比較例である。この場合，潤滑効果は得られるものの潤滑油の発火現象が発生した。条件No.３から５は，本発明の実施例であり，ロール表面の水膜厚が平均で１０μｍ以上であれば，潤滑油の発火現象は発生しなかった。また，ロール表面の水膜厚みが厚くなっても，潤滑油の供給量やガスアトマイズ供給する場合のガス供給量を増やすことによって，優れた潤滑効果を得ることができる，ということもわかった。 The experimental results are shown in Table 3 together with the experimental conditions. Condition No. 1 indicates the coefficient of friction when rolling without using lubrication. A smaller value than this friction coefficient means that the lubricating effect is excellent. Condition No. 2 is an example in which the thickness of the water film on the roll surface is thin, that is, a comparative example of the present invention. In this case, although the lubrication effect was obtained, the ignition of the lubricating oil occurred. Conditions No. 3 to 5 are examples of the present invention. When the water film thickness on the roll surface averaged 10 μm or more, the ignition phenomenon of the lubricating oil did not occur. It was also found that even if the water film thickness on the roll surface is increased, an excellent lubrication effect can be obtained by increasing the amount of lubricating oil supplied and the amount of gas supplied when gas atomizing is supplied.
また，表３の条件２から５について，水膜形成用水供給ノズルの向きを変えて，水膜形成用の水の供給場所と，潤滑供給場所とを重ねて，同じ条件で実験を行ったところ，表４に示すように，表３記載の結果とほぼ同じ結果になった。従って，このことから，ロール表面の水膜形成場所にかかわらず，水膜厚み換算で平均１０μｍ以上の水をロール表面に供給しながら，ガスアトマイズ供給法によって潤滑油を供給すれば，潤滑油の発火や引火による火災トラブルを引き起こすことなく，優れた潤滑効果を得ることができる，ということがわかった。 In addition, for conditions 2 to 5 in Table 3, the direction of the water film forming water supply nozzle was changed, and the water supply place for forming the water film and the lubrication supply place were overlapped, and the experiment was performed under the same conditions. As shown in Table 4, the results are almost the same as those shown in Table 3. Therefore, regardless of where the water film is formed on the roll surface, if lubricating oil is supplied by the gas atomizing supply method while supplying water with an average thickness of 10 μm or more to the roll surface in terms of water film thickness, ignition of the lubricating oil will occur. It was found that an excellent lubrication effect can be obtained without causing a fire trouble due to or ignition.
以上，添付図面を参照しながら本発明の好適な実施形態について説明したが，本発明はかかる例に限定されないことは言うまでもない。当業者であれば，特許請求の範囲に記載された範疇内において，各種の変更例または修正例に想到し得ることは明らかであり，それらについても当然に本発明の技術的範囲に属するものと了解される。 As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.
本発明は，鋼材の熱間圧延において幅広く適用でき，薄板や厚板等の平坦な製品の熱間圧延だけでなく，建材用のＨ形鋼の熱間圧延やパイプの熱間圧延など，あらゆる鋼材製品の熱間圧延で使用されている潤滑供給方法の効率的な手段として応用できるものである。 The present invention can be widely applied in hot rolling of steel materials, not only hot rolling of flat products such as thin plates and thick plates, but also hot rolling of H-shaped steel for building materials and hot rolling of pipes. It can be applied as an efficient means of the lubrication supply method used in hot rolling of steel products.
１ 上バックアップロール
２ 下バックアップロール
３ 上ワークロール
４ 下ワークロール
５ 被圧延材
６ 冷却水ヘッダー
７ 水切りワイパー
８ 潤滑剤ヘッダー
1 Upper backup roll 2 Lower backup roll 3 Upper work roll 4 Lower work roll 5 Rolled material 6 Cooling water header 7 Drain wiper 8 Lubricant header
Claims (2)
前記潤滑剤が噴射される入側ロール表面に，前記潤滑剤を噴射させていないときに平均１０μｍ以上の厚みの水膜を形成可能な量に相当する供給量で水を供給しながら，前記水の供給場所に潤滑剤を噴射供給することを特徴とする，熱間圧延における潤滑剤供給方法。 In a lubricant supply method in hot rolling, a lubricant having a viscosity at 40 ° C. of 8 cm 2 / s or less, having an average particle size of 5 mm or less, and sprayed to a roll together with a nonflammable gas,
While supplying water at a supply amount corresponding to an amount capable of forming a water film having an average thickness of 10 μm or more when the lubricant is not sprayed on the surface of the entrance roll to which the lubricant is sprayed, A method of supplying a lubricant in hot rolling, characterized by injecting and supplying a lubricant to a supply location.
The supply amount of lubricant to be injected and / or the flow rate of nonflammable gas is controlled in accordance with the thickness of the water film formed on the surface of the entry side roll or the amount of water supplied to the surface of the entry side roll. The method of supplying a lubricant according to claim 1 .
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307878A (en) * | 2014-11-10 | 2015-01-28 | 江苏亨特宏业重工有限公司 | Cooling device for hot rolling mill roller for aluminum profile production line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5114677B2 (en) * | 2008-06-30 | 2013-01-09 | 新日鐵住金株式会社 | Hot rolling equipment and hot rolling method |
| JP2011025305A (en) * | 2009-07-29 | 2011-02-10 | Nippon Steel Corp | Lubricating oil supplying method and device |
| CN103658190B (en) * | 2013-12-16 | 2015-11-11 | 新余钢铁集团有限公司 | A kind of Split hot tandem rolling cooling water water-retaining structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003094104A (en) * | 2001-09-21 | 2003-04-02 | Nippon Steel Corp | Method for lubrication feeding in hot rolling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003094104A (en) * | 2001-09-21 | 2003-04-02 | Nippon Steel Corp | Method for lubrication feeding in hot rolling |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307878A (en) * | 2014-11-10 | 2015-01-28 | 江苏亨特宏业重工有限公司 | Cooling device for hot rolling mill roller for aluminum profile production line |
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