JP3644368B2 - Rolling oil supply method and rolling oil supply apparatus - Google Patents

Description

【００３９】
この表１から分かるように、従来例に比べて、本発明に基づく装置の方が、ＥＳＩが高いことが分かる。特に、ノズルからの噴射圧が低くなっても、安定してＥＳＩが高いことが分かる。ちなみに、通常のＤＲ圧延での噴射圧は、噴射圧０．５〜１．５ＭＰａ程度である。
また、エマルジョンの粒径についても、本実施例の場合には、上記図５の圧延油供給装置（応答性の低い装置）で供給される圧延油と同等程度の小さい粒径となっていた。
【００４０】
したがって、濃度調整の応答を高く設定し且つノズルからの噴射圧が実操業レベルの圧力であっても、ヘッダ４から供給される圧延油についてＥＳＩを高い値に安定して保持できて被圧延材８の光沢を損なうことなく圧延できることが分かる。
このことは、噴射圧を若干低くしても、従来よりはＥＳＩが高い圧延油を供給できることを示す。また、噴射圧を大きくすることで噴射される圧延油のＥＳＩをより高くすることができることが分かる。
【００４１】
また、低濃度の圧延油の濃度について、１．０％に設定してミキサ１０で混合後の濃度を２０％にして実験した場合であっても、高いＥＳＩが確保されたことを確認している。すなわち、低濃度の圧延油の濃度は、少なくとも１．０％以上であれば、ＥＳＩを高くする保持する効果があることが分かる。
【００４２】
【発明の効果】
以上説明してきたように、本発明の圧延油供給方法を採用すると、ＤＲ圧延材など光沢の要求される被圧延材について、圧延油の原単位を増やすことなく、被圧延材の全長に亘って表面光沢を損なうことのない圧延が可能となるという効果がある。
【図面の簡単な説明】
【図１】本発明に基づく実施形態に係る圧延油供給装置を示す概略構成図である。
【図２】圧延速度と噴射される圧延油濃度との関係を示す図である。
【図３】圧延速度と圧延後の板面光沢との関係を示す図である。
【図４】噴射圧とエマルジョン粒径との関係を示す図である。
【図５】従来の圧延油供給装置を示す概略構成図である。
【符号の説明】
１ ミキシングタンク（低濃度用タンク）
２ 高濃度用タンク
３ 純水タンク
４ ヘッダ
５ 低濃度用ポンプ
８ 被圧延材
９ 圧延機のスタンド
１０ ミキサ
１１ 精密ギアポンプ（高濃度用ポンプ）
１２ 高濃度用供給路
１３ 低濃度用供給路
１４ 濃度コントローラ（濃度調整手段）
１５ ブースタポンプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to supply of rolling oil to a material to be rolled in cold rolling, and is rolled like double reduction rolling (hereinafter also referred to as DR rolling) or bright finish rolling (hereinafter also referred to as BR rolling). The present invention relates to a rolling oil supply method and a rolling oil supply apparatus that are employed in a cold rolling operation in which the surface of a subsequent material to be rolled is required to have a gloss more than necessary.
[0002]
[Prior art]
In cold rolling, in general, rolling is performed while spraying rolling oil at a predetermined jet pressure from the header nozzle to the surface of the material to be rolled. For example, as shown in FIG. 5, the high-concentration rolling oil fed from the rolling oil tank 2 and the water fed from the pure water tank 3 are mixed in the mixing tank 1. After stirring and mixing so as to sufficiently emulsify and adjusting the rolling oil to a target concentration, it is pumped from the mixing tank 1 to each header 4 by a pump 5 and rolled to a material 8 to be rolled from the header 4. This is done by injecting oil. Note that a rolling oil stock solution is appropriately pumped from the rolling oil storage tank 6 to the rolling oil tank 2. Reference numeral 16 denotes a return path of the rolling oil to the mixing tank 1. Moreover, the code | symbol 9 represents the stand of a rolling mill.
[0003]
Here, in the rolling oil supply method, since the rolling oil and water are sufficiently mixed in the mixing tank 1 and then fed to the header 4, the responsiveness of concentration adjustment is not high. That is, since the mixing tank 1 is set to be large and is not disposed directly under the header 4, the concentration of the rolling oil cannot be adjusted with high response. For this reason, the density | concentration of rolling oil is previously set to the safe side (high density | concentration side).
[0004]
And in cold rolling operations that require more gloss than required, such as DR rolling of tin plates (such as those that are cold-rolled twice), the concentration of rolling oil is constant and related to the rolling speed. The rolling oil injection pressure is kept constant, and the supply flow rate per unit time is controlled to be constant, or in a low-speed rolling section (such as when starting rolling of a single material to be rolled) that is slower than a predetermined rolling speed, In general, control is performed so as to reduce the supply flow rate per unit time by lowering the injection pressure.
[0005]
[Problems to be solved by the invention]
However, when a constant concentration of rolling oil is supplied at a constant injection pressure regardless of the rolling speed, the rolling oil is excessively supplied at a low-speed rolling portion such as a longitudinal end portion of the material to be rolled, and the basic unit of the rolling oil is reduced. There is a problem of rising. In addition, since the rolling oil is excessively supplied in the low-speed rolling section, there is a problem that the gloss of the plate surface in the low-speed rolling section is relatively poor compared to other portions.
[0006]
Also, when reducing the supply flow rate by reducing the rolling oil injection pressure in the low-speed rolling part, excessive supply in the low-speed rolling part can be avoided, but in order to reduce the injection pressure, it acts on the rolling oil in the header. The shearing effect to be reduced becomes small, and the emulsion particle size of the rolling oil to be sprayed tends to increase accordingly. As a result, an oil pit called “mottling” is generated on the surface of the material to be rolled 8, which causes a relative decrease in the surface gloss of the low-speed rolling portion in the entire length of the material to be rolled.
[0007]
FIG. 3 shows the relationship between the rolling speed and the sheet surface gloss in the conventional example. As can be seen from FIG. 3, in the conventional method, the plate surface gloss at the low-speed rolling portion is relatively poor in any case. Further, as shown in FIG. 4, the relationship between the injection pressure and the emulsion particle size shows that the emulsion particle size increases when the injection pressure is lowered.
[0008]
Here, application of the invention described in JP-A-5-84508 is also conceivable. In this rolling oil supply method, the concentration of the rolling oil supplied from the header 4 is adjusted by mixing the rolling oil preheated in the tank and adjusting the concentration with hot water in the header 4 or immediately before the header 4. It is. If this technique is adopted, the responsiveness of the concentration adjustment is improved. However, in the method of adjusting the concentration by mixing the rolling oil and water immediately before the header 4 or in the header 4 as described above, ESI ( The emulsion sustainability index (emulsification stability) is low, and the particle size of the rolling oil emulsion supplied from the header 4 is likely to be large, and oil pits called mottling are generated on the surface of the material 8 to be rolled. This causes a significant reduction in surface gloss. Therefore, this rolling oil supply method has a problem in application to a material to be rolled that requires a particularly beautiful surface gloss, that is, a DR rolled material or a BR rolled material targeted by the present invention.
[0009]
A technique for mixing oil with oil is described in JP-A-56-41010. The purpose of this is to propose a lubrication method that provides both cooling and lubrication, as well as economic efficiency, in the lubrication system lubrication facility that uses both roll coolant and rolling lubricant. The outlet side of each stand of a cold rolling mill Rolling oil is added to the extraction part extracted from the circulating emulsion liquid injected as a roll coolant, sprayed before the biting of each stand as a rolling oil lubricant, and then joined to the circulating emulsion liquid. . However, this technique is completely different from the technique for obtaining a more beautiful steel plate surface in the so-called direct-type oil supply method capable of ensuring good lubricity as in the present application.
[0010]
The present invention has been made paying attention to the above-mentioned problems, and even when there is a change in the rolling speed when rolling one rolled material, the surface gloss is impaired over the entire length of the rolled material. It is an object of the present invention to provide a rolling oil supply method and a rolling oil supply device that can be rolled without any problems.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1, in rolling oil supply method for injecting rolling oil of a predetermined concentration toward the header to the rolled material, the rolling speed of the rolling stock is less than a predetermined rolling speed In this case, the concentration of the rolling oil to be sprayed is adjusted in proportion to the rolling speed, and the concentration adjustment is performed by mixing the low concentration rolling oil and the high concentration rolling oil immediately before or in the header. It is characterized by doing.
[0012]
Next, the invention described in claim 2 is characterized in that, with respect to the configuration described in claim 1, the injection pressure of the rolling oil is changed according to the concentration of the rolling oil to be injected .
In order to solve the above-mentioned problem, the invention described in claim 3 is a rolling oil supply method for injecting a predetermined concentration of rolling oil from a header toward a material to be rolled. The concentration of the rolling oil is adjusted, and the concentration adjustment is performed by mixing the low concentration rolling oil and the high concentration rolling oil immediately before or in the header, and depending on the concentration of the rolling oil to be injected, It is characterized by changing the injection pressure of the rolling oil.
[0013]
Next, in the invention described in claim 4, the low-concentration rolling oil is obtained by mixing high-concentration rolling oil and water in advance with respect to the configuration described in any one of the first to third aspects. It is characterized by forming.
Next, in the invention described in claim 5, the concentration of the low-concentration rolling oil with respect to the configuration described in any one of claims 1 to 4 is set to a minimum expected level of the rolling oil to be injected. The concentration of the rolling oil to be injected is controlled by adjusting the supply flow rate of the high-concentration rolling oil with respect to the supply flow rate of the low-concentration rolling oil. .
[0014]
Next, the invention described in claim 6 is a rolling oil supply device that injects rolling oil adjusted to a predetermined concentration from a header toward a material to be rolled, and a low concentration tank containing low concentration rolling oil; A high-concentration tank containing high-concentration rolling oil, a mixer that mixes low-concentration rolling oil and high-concentration rolling oil, and supplies the mixed rolling oil to the nozzle of the header, and a low-concentration tank A low-concentration supply path for supplying rolling oil to the mixer, a high-concentration supply path for supplying the rolling oil in the high-concentration tank to the mixer, and the low-concentration supply path interposed between the low-concentration supply path and pumping the rolling oil. A low concentration pump, a high concentration pump interposed in the high concentration supply path and pumping rolling oil, and a discharge flow rate of the low concentration pump or the high concentration pump based on the rolling speed of the material to be rolled. a concentration adjusting means for adjusting, adjusted by the concentration adjusting means Depending on the concentration of rolling oil and it is characterized by comprising an injection pressure adjusting means for adjusting the injection pressure of rolling oil to be injected from the header.
[0015]
Next, the invention described in claim 7 is characterized in that, in the configuration described in claim 6, the mixer is provided immediately before or in the header.
Next, the invention described in claim 8 is the configuration described in claim 6 or claim 7, wherein the low concentration tank has a mixer function and mixes high concentration rolling oil and water. Thus, the low-concentration rolling oil is formed.
[0016]
Next, the invention described in claim 9 is the configuration described in any one of claims 6 to 8, wherein the concentration adjusting means is configured such that the high concentration pump has a discharge flow rate of the low concentration pump. Ru der those characterized by adjusting the concentration of rolling oil to be injected from the header by controlling the discharge flow rate.
[0017]
According to the present invention, since density adjustment is performed by mixing immediately before the header or within the header, the density adjustment response is high. Moreover, since the mixing is between rolling oils, the emulsion particle size is small, the emulsion stability is good, and the rolling oil can be supplied from the header to the material to be rolled with a high ESI.
In addition, since the concentration is adjusted with high response according to the rolling speed and the optimum concentration of rolling oil is supplied, there is no need to lower the injection pressure even when the rolling speed is low. It is possible to prevent the diameter from becoming large and prevent the glossiness of the plate surface from being lowered in the low-speed rolling part.
[0018]
Further, according to the invention of claim 1 , as shown in FIG. 3, the sheet surface gloss is lower than a predetermined rolling speed in view of the fact that the lower the rolling speed is, the lower the rolling speed is in a low-speed rolling part. Only in this case, by adjusting the concentration in proportion to the rolling speed, it is possible to prevent the plate surface gloss from being lowered in the low-speed rolling portion.
Further, when the injection pressure is changed according to the concentration change as in claims 2, 3 and 6 , the adjustment of the rolling oil supply due to the delay in the concentration adjustment response can be corrected. For example, in the low-speed rolling section, even if the concentration is adjusted so that the concentration according to the rolling speed is slightly lower, by changing the injection pressure to a higher level, the required rolling oil supply can be reduced while keeping the emulsion particle size small. Is possible.
[0019]
Moreover, according to the invention of Claim 4 or Claim 8, it becomes possible to make small the emulsion particle size of the low concentration rolling oil by pre-stirring, and the emulsion particle size of the rolling oil injected from the header can be made small. It becomes possible.
Further, according to the inventions of the fifth and ninth aspects, since the concentration adjustment is performed by controlling the supply flow rate side of the high concentration rolling oil, the concentration can be changed with high response.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In addition, about the components similar to the said conventional example, the same code | symbol is attached | subjected and demonstrated.
FIG. 1 is a schematic configuration diagram illustrating a rolling oil supply apparatus according to the present embodiment.
Reference numeral 6 denotes a rolling oil storage tank that stores a stock solution of rolling oil. The rolling oil storage tank 6 is connected to the high concentration tank 2 through a valve and a pump, and the stock solution of rolling oil is appropriately concentrated at high concentration. The tank 2 can be pumped. The high concentration tank 2 is connected to a mixing tank 1 (low concentration tank) via a pump so that high concentration rolling oil can be pumped to the mixing tank 1. Further, the high concentration tank 2 is connected to the mixer 10 disposed immediately below the header 4 through the high concentration supply path 12. The high concentration supply path 12 is provided with a booster pump 15 and a precision gear pump 11 from the upstream side, and the supply flow rate of the rolling oil discharged to the mixer 10 can be controlled with high response. The precision gear pump 11 adjusts the discharge flow rate according to a command from the concentration controller 14. The precision gear pump 11 constitutes a high concentration pump, and reference numeral 7 denotes a return path.
[0021]
A pure water tank 3 is connected to the mixing tank 1 through a pump, and hot water stored in the pure water tank 3 can be pumped to the mixing tank 1 by the pump. The mixing tank 1 sufficiently stirs and mixes the high-concentration rolling oil pumped from the high-concentration tank 2 and water to form a low-concentration rolling oil. The density | concentration of the low concentration rolling oil in the mixing tank 1 is set to the minimum density | concentration assumed as a density | concentration of the rolling oil supplied to the material 8 to be rolled, for example.
[0022]
The mixing tank 1 is connected to the mixer 10 through a low-concentration supply path 13, and low-concentration rolling oil can be pumped to the mixer 10 by a low-concentration pump 5 interposed in the low-concentration supply path 13. It has become. The discharge flow rate of the low concentration pump 5 is controlled by a command from the concentration controller 14.
The mixer 10 is disposed immediately before the header 4, continuously mixes the supplied high-concentration rolling oil and low-concentration rolling oil, and discharges them to the header 4. The header 4 can inject the supplied rolling oil having a predetermined concentration toward the surface of the material 8 to be rolled from a plurality of nozzles.
[0023]
The concentration controller 14 receives a rolling speed signal from a speedometer 15 that detects the rotation speed of the rolling roll, and also inputs a target concentration corresponding to a preset material 8 to be rolled. Here, the rolling speed is not limited to the case where the actual rolling speed is input from the speedometer 15, and the actual rolling speed or the rolling speed based on the scheduled schedule is input from a controller (not shown) of the rolling mill. You may do it.
[0024]
The concentration controller 14 obtains the injection concentration by changing the target concentration based on the rolling speed, and controls the discharge flow rate of the precision gear pump 11 so as to obtain the injection concentration. In other words, the concentration controller 14 sets the supply flow rate of the high-concentration rolling oil at which the rolling oil supplied from the header 4 becomes the injection concentration based on the preset supply flow rate and injection concentration of the low-concentration rolling oil. Then, a command for the discharge flow rate to be the supply flow rate is sent to the precision gear pump 11. In addition, the target density | concentration of rolling oil is determined by the roughness, rolling reduction, etc. of a rolling roll. Moreover, what is necessary is just to set the supply flow rate to the mixer 10 of the low concentration rolling oil, for example so that the jet flow rate from the nozzle of the header 4 may become target flow rate (injection pressure). Here, the density controller 14 constitutes a density adjusting means.
[0025]
Then, the injection concentration is adjusted by changing the concentration according to the rolling speed, as shown in FIG. 2, which is a relationship between the concentration obtained in advance by experiments and the rolling speed. At this time, since the difference between the target concentration and the optimum injection concentration is small as shown in FIG. 2 above the predetermined rolling speed, only the rolling oil below the predetermined rolling speed, that is, only the low-speed rolling part, depends on the rolling speed. When the density (injection density) is changed and is faster than the predetermined rolling speed, the target density may be adjusted to the injection density.
[0026]
The predetermined rolling speed corresponds to, for example, the rolling speed at the center in the longitudinal direction of the material to be rolled, which is the rolling speed during steady rolling.
In the rolling oil supply apparatus having the above-described configuration, only a necessary amount is provided immediately before the header 4 with respect to the low-concentration rolling oil which is sufficiently stirred and mixed in the mixing tank 1 and has good emulsification stability and small emulsion particle size. Thus, the rolling oil adjusted to the target concentration is supplied to the material 8 to be rolled. As described above, since the concentration is adjusted immediately before the header 4, the responsiveness of the concentration adjustment of the rolling oil is high.
[0027]
In addition, since the concentration is adjusted by adjusting the supply flow rate side of the high-concentration rolling oil, the responsiveness of the concentration adjustment is further increased.
As a result, it is possible to always supply the rolling oil having the target injection concentration, that is, it is not necessary to set the concentration of the rolling oil supplied from the header 4 higher as in the conventional case, so that the rolling oil intensity can be suppressed. For example, even if it is necessary to increase or decrease the concentration of the supplied rolling oil, it is not necessary to change the concentration of the rolling oil in the mixing tank 1, and the supply flow rate of the high concentration rolling oil by the precision gear pump 11 is not necessary. It becomes possible to respond immediately by adjusting.
[0028]
Moreover, in the mixer 10 arrange | positioned just before the header 4, since rolling oil is mixed, emulsification stability is good and it does not accompany the expansion of a particle size. As a result, even if the concentration adjustment is performed immediately before the header 4 in order to increase the responsiveness of the rolling oil concentration, it is possible to suppress the occurrence of oil pits called mottling on the surface of the material 8 to be rolled.
[0029]
In addition, since low concentration rolling oil is supplied with sufficient stirring in the mixing tank 1, the ESI of the low concentration rolling oil is high and the particle size of the emulsion is also small.
Moreover, it is not necessary to lower the rolling oil injection pressure despite the fact that an optimum concentration of rolling oil corresponding to the rolling speed is supplied with high response. It becomes possible to supply the entire length of the rolled material 8. For this reason, even if it is a low-speed rolling part like the longitudinal direction edge part of the to-be-rolled material 8, it rolls without impairing surface gloss.
[0030]
That is, in the apparatus of the present embodiment, the optimum supply of rolling oil can be made with high response while suppressing the occurrence of oil pits called mottling over the entire length of the material 8 to be rolled.
Thereby, even if the line configuration is such that the rolled material 8 that requires a beautiful gloss such as a DR rolled material is continuously rolled, cold rolling can be performed without impairing the gloss of the plate surface.
[0031]
Here, in the above embodiment, the low concentration rolling oil is formed by supplying the high concentration rolling oil from the high concentration tank 2 to the mixing tank 1 (low concentration tank). It is not always necessary to supply the rolling oil from the high concentration tank 2. In short, it is only necessary that the rolling oil in the mixing tank 1 has a low concentration. However, the apparatus configuration is more compact by sequentially forming the low concentration rolling oil in the mixing tank 1 while taking in the rolling oil from the high concentration tank 2.
[0032]
Moreover, in the said embodiment, although the density | concentration of the low concentration rolling oil is set to the minimum density | concentration of the assumed rolling oil, you may be lower than the minimum density | concentration. If it is set to be higher than the assumed minimum concentration, some of the material to be rolled 8 cannot be handled. Therefore, the upper limit value of the concentration of the low-concentration rolling oil is not more than the assumed minimum concentration of the rolling oil. It is preferable.
[0033]
In addition, it is preferable that the density | concentration of a low concentration rolling oil shall be 1% or more in order to ensure high ESI. Moreover, in order to make it possible to deal with all the material 8 to be rolled, the lower limit value of the concentration of the high-concentration rolling oil is preferably set to a concentration that exceeds the assumed maximum concentration of the rolling oil. The upper limit of the concentration of the high-concentration rolling oil is 100% (concentration of crude oil in the rolling oil). From the viewpoint that the concentration of the rolling oil in the mixer 10 can be adjusted with high response by a small change of the high concentration rolling oil, the high concentration rolling oil is preferably used as a stock solution of the rolling oil.
[0034]
Moreover, in the said embodiment, although the mixer 10 which mixes a low concentration rolling oil and a high concentration rolling oil was arrange | positioned just before the header 4, you may arrange | position this mixer 10 in the header 4. FIG.
Moreover, when changing a density | concentration according to a rolling speed as mentioned above, you may make it change the injection pressure from the header 4 according to the said density | concentration change. For example, the supply flow rate to the material to be rolled 8 may be optimally adjusted by controlling the injection pressure to increase as the concentration of the rolling oil is lowered. The injection pressure is changed, for example, by adjusting the supply flow rate of the low-concentration rolling oil or by providing a valve between the header 4 and the mixer 10 and controlling the valve. The adjustment of the supply flow rate of the low concentration rolling oil and the control of the valve may be performed by the concentration controller 14, for example. In this case, the concentration controller 14 also serves as an injection pressure adjusting means.
[0035]
【Example】
An off-line experiment was conducted on ESI of the rolling oil discharged from the mixer 10 in the apparatus of the above embodiment. The ESI of the conventional example in which the rolling oil and water are mixed by the mixer 10 was also obtained for comparison.
In the example based on this embodiment, the experimental conditions were set such that the concentration of the rolling oil in the mixing tank 1 was 7% and the concentration of the rolling oil discharged from the mixer 10 was 10%. In the conventional example, the concentration of the rolling oil in the mixing tank 1 is set to 0% (that is, hot water), and the rolling oil and hot water are mixed by the mixer 10 and discharged from the mixer 10. The concentration of was set to 10%. The high concentration rolling oil was a crude oil of rolling oil.
[0036]
Moreover, the injection pressure from the nozzle of the header 4 (the nozzle was made into one) was performed by two types, 0.7 MPa and 1.3 MPa, the rolling oil injected from the said nozzle was extract | collected, and ESI was evaluated.
The evaluation of ESI was expressed by the ratio of the oil concentration of the supernatant liquid to the oil concentration of the liquid at the bottom of the container after the collected rolled oil was left in the container for 5 minutes.
[0037]
The experimental results are shown in Table 1.
[0038]
[Table 1]

[0039]
As can be seen from Table 1, it can be seen that the apparatus according to the present invention has higher ESI than the conventional example. In particular, it can be seen that ESI is stably high even when the injection pressure from the nozzle is low. Incidentally, the injection pressure in normal DR rolling is about 0.5 to 1.5 MPa.
Further, in the case of the present embodiment, the particle size of the emulsion was as small as that of the rolling oil supplied by the rolling oil supply device (device with low responsiveness) shown in FIG.
[0040]
Therefore, even if the response of concentration adjustment is set high and the injection pressure from the nozzle is a pressure at the actual operation level, the ESI can be stably maintained at a high value for the rolling oil supplied from the header 4, and the material to be rolled It can be seen that rolling can be performed without impairing the gloss of No. 8.
This indicates that even if the injection pressure is slightly lowered, it is possible to supply rolling oil having a higher ESI than before. Moreover, it turns out that ESI of the rolling oil injected can be made higher by making injection pressure large.
[0041]
In addition, it was confirmed that a high ESI was secured even when the concentration of the low concentration rolling oil was set to 1.0% and the concentration after mixing with the mixer 10 was set to 20%. Yes. That is, it can be seen that if the concentration of the low-concentration rolling oil is at least 1.0% or more, there is an effect of increasing the ESI.
[0042]
【The invention's effect】
As described above, when the rolling oil supply method of the present invention is adopted, the rolled material such as the DR rolled material is required to have a gloss, without increasing the basic unit of the rolled oil, over the entire length of the rolled material. There is an effect that it is possible to perform rolling without impairing the surface gloss.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a rolling oil supply device according to an embodiment of the present invention.
FIG. 2 is a graph showing the relationship between rolling speed and injected rolling oil concentration.
FIG. 3 is a diagram showing the relationship between rolling speed and plate surface gloss after rolling.
FIG. 4 is a diagram showing the relationship between the injection pressure and the emulsion particle size.
FIG. 5 is a schematic configuration diagram showing a conventional rolling oil supply apparatus.
[Explanation of symbols]
1 Mixing tank (low concentration tank)
2 High Concentration Tank 3 Pure Water Tank 4 Header 5 Low Concentration Pump 8 Roll Material 9 Rolling Mill Stand 10 Mixer 11 Precision Gear Pump (High Concentration Pump)
12 High-concentration supply path 13 Low-concentration supply path 14 Concentration controller (concentration adjusting means)
15 Booster pump

Claims (9)

In the rolling oil supply method for injecting a predetermined concentration of rolling oil from the header toward the material to be rolled, when the rolling speed of the material to be rolled is equal to or lower than the predetermined rolling speed, the rolling oil to be injected is proportional to the rolling speed . A rolling oil supply method characterized in that the density is adjusted, and the density adjustment is performed by mixing a low-concentration rolling oil and a high-concentration rolling oil immediately before or in the header. The rolling oil supply method according to claim 1, wherein the injection pressure of the rolling oil is changed according to the concentration of the rolling oil to be injected . In the rolling oil supply method of injecting a predetermined concentration of rolling oil from the header toward the material to be rolled, the concentration of the rolling oil to be injected is adjusted according to the rolling speed of the material to be rolled, and the concentration adjustment is performed immediately before the header or performs by mixing the low density rolling oil and high concentration rolling oil in the header, depending on the concentration of rolling oil to be injected, rolling oil you and changes the injection pressure of the rolling oil Supply method.   The rolling oil supply method according to any one of claims 1 to 3, wherein the low-concentration rolling oil is formed by mixing a high-concentration rolling oil and water in advance.   The concentration of the low-concentration rolling oil is set to be equal to or lower than the assumed minimum concentration of the rolling oil to be injected, and the supply flow rate of the high-concentration rolling oil is controlled with respect to the supply flow rate of the low-concentration rolling oil. The rolling oil supply method according to any one of claims 1 to 4, wherein the concentration of the rolling oil to be injected is controlled. In a rolling oil supply device that injects rolling oil adjusted to a predetermined concentration from a header toward a material to be rolled, a low concentration tank that contains low concentration rolling oil and a high concentration tank that contains high concentration rolling oil And a mixer for mixing the low-concentration rolling oil and the high-concentration rolling oil and supplying the mixed rolling oil to the nozzle of the header, and a low-concentration supply path for supplying the rolling oil in the low-concentration tank to the mixer A high-concentration supply path that supplies the rolling oil in the high-concentration tank to the mixer, a low-concentration pump that is interposed in the low-concentration supply path and pumps the rolling oil, and the high-concentration supply path A high-concentration pump that is interposed between the high-concentration pump and pumps the rolling oil, a concentration adjusting unit that adjusts the discharge flow rate of the low-concentration pump or the high-concentration pump based on the rolling speed of the material to be rolled, and the concentration adjusting unit. Depending on the concentration of the rolling oil to be adjusted, Rolling oil supply system, characterized in that it comprises an injection pressure adjusting means for adjusting the injection pressure of rolling oil to be injected from.   The rolling oil supply apparatus according to claim 6, wherein the mixer is provided immediately before or in the header.   The rolling according to claim 6 or 7, wherein the low concentration tank has a mixer function and mixes high concentration rolling oil and water to form the low concentration rolling oil. Oil supply device. The said density | concentration adjustment means adjusts the density | concentration of the rolling oil injected from a header by controlling the discharge flow rate of the said high concentration pump with respect to the discharge flow rate of the said low concentration pump. rolling oil supply equipment as claimed in any one of claim 8.

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