JP4650177B2 - Method and apparatus for supplying hot rolling oil - Google Patents

Description

  The present invention relates to a hot rolling oil supply method and supply device for mixing hot rolling oil with carrier water and supplying the hot rolling oil to the surface of a hot rolling roll.

  Hot rolling oil is used to prevent rough surface of a hot rolling roll (hereinafter abbreviated as “rolling roll” in this specification), to prevent wear of the rolling roll, to improve the surface quality of the rolled product, and to lower the rolling load. For the purpose, etc., it is used by spraying onto the surface of the rolling roll.

  The hot rolling oil is mixed with carrier water and supplied to the rolling roll. An appropriate amount of hot rolling oil and carrier water is sent to the mixer through each pipe line, and the hot rolling oil is mixed into the carrier water by the mixer. The mixed solution is sprayed from the nozzle to the surface of the rolling roll via the pipe and the header. Normally, river water, lake water, ground water, tap water, etc. are used as carrier water.

  As a problem in the supply of hot rolling oil to the rolling roll, nozzle clogging occurs due to the formation of slime, which is a sticky solid, in the pipe between the mixer and the nozzle and in the header. Can be mentioned. In addition, foreign matters such as rust may clog the nozzle. When nozzle clogging occurs, uneven spraying of the mixed liquid onto the surface of the rolling roll occurs, which causes roughing of the rolling roll and easily causes scale wrinkles in the product.

  In order to prevent clogging of the nozzle, it is effective to filter the carrier water with a filter. However, even if a filter is used, generation of slime cannot be prevented, and even if a filter is provided between the mixer and the nozzle, there is a problem that filter clogging occurs very early due to slime.

Patent Document 1 discloses an invention that prevents clogging of a spray nozzle by supplying hot water to a spray nozzle header group when hot rolling oil is not jetted.
JP-A-8-224612

  Even with the invention disclosed in Patent Document 1, prevention of nozzle clogging is insufficient. In other words, in the present invention, since the warm water is allowed to flow by bypassing the mixer, the mixed liquid stays in the mixer or at the outlet piping, and nozzle clogging is likely to occur. In addition, Patent Document 1 describes that hot water, soft water, or pure water may be used in place of warm water, but the temperature or the like is not described at all, and its purpose, effect, etc. Is completely unknown.

  As a result of examining the means for preventing the occurrence of slime in the pipe and the header, the present inventors have found that bacteria and fungi are present in the carrier water. Since slime is generated to grow using hot rolled oil as a nutrient source, we know that slime generation can be suppressed by sterilizing carrier water before mixing with hot rolled oil. Over time, the present invention was completed.

  The present invention is a method of mixing hot rolling oil and carrier water and supplying it to the surface of a rolling roll. When the temperature of the carrier water is at least 8 ° C. and less than 50 ° C., hot rolling A hot rolling oil supply method characterized by having a heating step of heating carrier water to a temperature of 50 ° C. or higher before mixing with oil. According to the present invention, the slime in the pipe connecting the mixer for mixing the hot rolling oil and the carrier water and the nozzle for supplying to the surface of the rolling roll, or in the header connected to the nozzle The occurrence of nozzle clogging can be prevented and the occurrence of nozzle clogging can be suppressed.

  In the hot rolling oil supply method according to the present invention, it is desirable that the heating temperature of the carrier water is 80 ° C. or less. According to this invention, generation | occurence | production of slime can be prevented while preventing the fall of the amount of adhesion oil which causes the rough surface of a rolling roll, and generation | occurrence | production of nozzle clogging can be suppressed.

  In these hot rolling oil supply methods according to the present invention, it is desirable to have a filtration step of filtering the carrier water through a filter before the heating step. According to this invention, it is further possible to prevent foreign matter such as rust from clogging the nozzle.

  From another point of view, the present invention is an apparatus for mixing hot rolling oil and carrier water with a mixer and supplying it to a rolling roll, and the carrier is provided in the middle of a pipe for supplying carrier water to the mixer. A hot rolling oil supply apparatus comprising a heating means for heating water.

In the hot rolling oil supply apparatus according to the present invention, it is desirable to provide a thermometer for measuring the temperature of the carrier water on one or both of the inlet side and the outlet side of the heating means.
In the present invention, it is desirable to inject a third mixed oil within elapsed after mixing the carrier water and hot rolling oil from the nozzle. When after 3 minutes or more, there is a fear that the hot-rolling oil and the carrier water can no longer be injected uniform mixed oil from the nozzle to separate.

  According to the present invention, when hot rolling oil is mixed with carrier water and supplied to the surface of the rolling roll, slime is prevented from being generated inside the pipe and header between the mixer and the nozzle, thereby clogging the nozzle. Can be effectively suppressed.

Moreover, the apparatus according to the present invention is simple and inexpensive, and its processing cost is also low.
Further, according to the present invention, it becomes possible to stably supply hot rolling oil, it is possible to prevent roughing of the rolling roll and generation of product scale wrinkles, and to improve product quality.

  Furthermore, according to the present invention, it is possible to improve the wear resistance of the rolling roll, to reduce the rolling load and to suppress fluctuations, and to more stably pass the plate.

Hereinafter, the best mode for carrying out the supply method and supply device for a hot rolling oil according to the present invention will be described in detail with reference to the accompanying drawings.
First, the knowledge that is the basis of the present invention will be described.
(1) When mixed with hot rolled oil in the presence of bacteria, mold, etc. in the carrier water, the bacteria, mold, etc. grow using the hot rolled oil as a nutrient source, and as a result slime is generated.
(2) There is a correlation between the temperature of carrier water and the generation of slime. That is, when carrier water becomes high temperature, the total bacterial count increases and slime production increases. On the other hand, when the temperature is lowered, the total number of bacteria decreases and the production of slime is suppressed.
(3) Using lake water as carrier water, the results of analyzing the total bacterial count ratio of bacteria, molds, etc. in carrier water (lake water) at each temperature are shown in a graph in FIG. The total number of bacteria was measured after immersing a bacterial measurement test piece (Sun Bio Checker TTC manufactured by Sanai Oil Co., Ltd.) in carrier water and culturing the bacterial measurement test piece at 30 ° C. for 24 hours.
(4) As shown in the graph of FIG. 1, the total bacteria count ratio is 0 when the temperature of the carrier water is less than 8 ° C., but gradually increases when the temperature is 8 ° C. or more.
(5) no occurrence of slime even when the carrier water if the water temperature of the carrier water below 8 ° C. used as it, nozzle clogging does not occur. On the other hand, when the water temperature of the carrier water is 8 ° C. or higher, slime is generated and nozzle clogging occurs.

Then, intensive investigation and research on how to sterilize the bacteria of the carrier water of more than 8 ℃, to obtain the knowledge listed below.
(6) FIG. 2 is a graph showing the results of measuring the total cell count ratio after heating carrier water at a flow rate of 300 L / min at a water temperature of 25 ° C. and a flow rate of 300 L / min to various temperatures for 1 second. The total bacterial count ratio is determined by placing a bacterial test specimen (Sanai Bio Checker TTC manufactured by Sanai Petroleum) immersed in carrier water in a sealed container and culturing at 30 ° C. for 24 hours, and then breeding bacteria on the surface of the test specimen. The situation was determined in light of the standard comparison table.
(7) As shown in the graph in FIG. 2, the total cell count ratio by heating for 1 second carrier water over 50 ° C. becomes substantially zero. The same result was obtained even when heating for 1 second or longer. By heating to 55 ° C. or higher, the total bacterial count ratio becomes completely zero. Therefore, the heating temperature is desirably 55 ° C. or higher.
(8) by mixing the hot rolling oil to the heated carrier water 50 ° C. or higher, it is possible to prevent slime, and the prevention of nozzle clogging. For this reason, when the temperature of carrier water is 50 degreeC or more, it is not necessary to heat carrier water and it should just use it.
(9) FIG. 3 is a graph showing the investigation results of the relationship between the deposition amount of oil in the water temperature and the surface of the rolling roll of the carrier water. As shown in the graph of FIG. 3, the higher the carrier water temperature, the higher the ESI (emulsification dispersibility), the oil and the water are less likely to separate, and the hot rolling oil is less likely to adhere to the surface of the rolling roll. . Further, in order to increase cleaning of the surface of the rolling roll temperature of carrier water is high, adhesion oil amount to the surface of the rolling roll is decreased. This reduction in the amount of adhered oil promotes the roughening of the rolling roll.
(10) FIG. 4 is a graph showing an example of the relationship between the water temperature of the carrier water and hot-rolling oil hydrolysis rate. As shown in the graph of FIG. 4, as the temperature of the carrier water increases, the hot rolling oil component ester is easily hydrolyzed into fatty acid and alcohol, and the performance as hot rolling oil is impaired.
(11) Further, as the carrier water temperature is increased, the heat treatment cost is increased and disadvantageous, which is undesirable from the viewpoint of workability and safety such as burns of the operator.
(12) Therefore, the upper limit temperature of the carrier water in mixing hot rolling oil in a carrier water is preferably set to 80 ° C..

Next, the hot rolling oil supply device of the present embodiment will be described.
FIG. 5 is an equipment outline diagram of an example of the supply device 0 of the present embodiment.
In FIG. 5, reference numerals 1-1 and 1-2 are carrier water pipes, reference numeral 2 is a hot rolling oil pipe, and reference numeral 8 is a mixer of carrier water and hot rolling oil.

  A heating device 6 is provided in the middle of the carrier water pipe 1-1, and thermometers 5-1, 5-5 for measuring the temperature of the carrier water are provided on the entrance side and the exit side of the heating device 6. 2 is provided. The heating device 6 is controlled by the temperature control device 7 based on the temperature measurement values of the thermometers 5-1 and 5-2. Further, reference numeral 4 denotes a filtration device (filter), reference numeral 3 denotes a mixed oil pipe, reference numeral 9 denotes a header, and reference numeral 10 denotes a nozzle.

  The filtration device 4 is for removing foreign matters such as rust and algae mixed in the carrier water, and a general filter can be used. The filter mesh is preferably about 0.8 mm or less.

  The heating device 6 is for heating the carrier water based on a command from the temperature control device 7. For example, a known heating means such as a heater such as electricity or gas, or a heat exchanger using a high-temperature medium is used. Can be used. As the heat exchanger, a heat exchanger using heated steam can be used. In this heat exchanger, the temperature rise of the carrier water can be adjusted by adjusting the amount of heating steam. The specification of the length of the heating area of the heat exchanger is determined based on the flow rate specification of the carrier water so that the carrier water at 8 ° C. can be heated to a minimum of 50 ° C. for a minimum of 1 second.

  The temperature control device 7 determines whether or not heating is necessary based on the temperature measurement value of the incoming thermometer 5-1, and if further heating is required, determines the amount of temperature rise due to heating and outputs it to the heating device 6. To control the heating output. Further, the heating output is controlled so that the heated carrier water is in an appropriate temperature range based on the temperature measurement value of the outgoing thermometer 5-2. This heating control device 7 can heat the carrier water to 50 ° C. or higher for 1 second or longer.

  When the temperature of carrier water is less than 8 ° C., heating is not necessary. When the water temperature of the carrier water is 8 ° C. or higher and lower than 50 ° C., a command for heating the carrier water to a temperature of 50 ° C. or higher is transmitted to the heating device 6. In addition, you may heat also when the water temperature of carrier water is less than 8 degreeC.

  The thermometers 5-1 and 5-2 are not particularly limited. For example, a platinum resistance thermometer thermometer can be used. Moreover, in this Embodiment, although the case where the thermometers 5-1, 5-2 were each provided in the entrance side and exit side of the heating apparatus 6 was shown, it is not necessarily limited to this form. You may provide in either one. Or you may heat so that the temperature rising amount may be determined empirically, without measuring the temperature of carrier water.

  The mixer 8 is connected with a carrier water pipe 1-1, a hot rolled oil pipe 2 and a mixed oil pipe 3. A nozzle 10 is attached to the mixed oil pipe 3 via a header 9. In the mixer 8, the carrier water supplied from the carrier water pipe 1-1 and the hot rolling oil supplied from the hot rolling oil pipe 2 are mixed. The mixing ratio is adjusted so that the concentration of the hot rolling oil is, for example, about 0.05 to 1.0% by volume. In addition, as hot rolling oil, a synthetic ester system etc. are used, for example.

Mixed mixed oil, via the header 9 via a pipe 3 of the mixed oil is injected from the nozzle 10 to the surface of the rolling rolls (not shown).
As described above, the hot rolling oil supply device 0 according to the present embodiment is a device for mixing the hot rolling oil and the carrier water with the mixer 8 and supplying the mixed water to the rolling roll. A heating means 6 for heating the carrier water is provided in the middle of the pipe 1-1 supplied to the mixer 8. And the thermometers 5-1 and 5-2 for measuring the temperature of carrier water are provided in both the entrance side and exit side of this heating means 6. FIG.

Next, a situation where hot rolling oil is supplied using the supply device 0 will be described.
Carrier water fed by a pipe 1-1 is removed foreign matters such as rust and algae are mixed by a filtration device (filter) 4. And water temperature is measured with the thermometer 5-1 provided in the middle of piping 1-1.

  The temperature measurement value by the thermometer 5-1 is output to the temperature control device 7. In the temperature control device 7, when this temperature measurement value is at least 8 ° C. or more and less than 50 ° C., the temperature rise is calculated so that the temperature of the carrier water is raised to 50 ° C. or more, preferably 80 ° C. or less. -Determine and output this to the heating apparatus 6 as a set value of the temperature rise amount.

  In the heating device 6, the carrier water is heated based on the set value of the temperature increase amount. At this time, the temperature of the carrier water is measured by a thermometer 5-2 provided on the outlet side of the heating device 6, and this temperature measurement value is output to the temperature control device 7. The temperature control device 7 calculates the difference between the target value and the measured value, corrects the set value of the temperature increase amount, and outputs it to the heating device 6.

  Thus, according to the present embodiment, carrier water having a temperature of 50 ° C. or higher and 80 ° C. or lower or carrier water of less than 8 ° C. is supplied to the mixer 8 and mixed with hot rolling oil. . For this reason, according to the present embodiment, it is possible to prevent generation of slime in the nozzle or header for injecting the mixed oil, so that nozzle clogging can be prevented, and a desired amount of hot rolling oil can be applied to the surface of the rolling roll. Can prevent the rough surface of the rolling roll from being generated and the ester of the hot rolling oil component can be prevented from hydrolyzing into fatty acid and alcohol, so that the performance as a hot rolling oil is maintained over a long period of time. In addition, the temperature of the carrier water is not excessively increased, which is desirable from the viewpoint of heat treatment cost, operator workability, and safety.

Furthermore, the present invention will be described more specifically with reference to examples.
The hot rolling oil was supplied to the surface of the rolling roll of the hot finishing mill using the hot rolling oil supply device 0 shown in FIG. 5 described above. That is, in FIG. 5, the carrier water using the lake water is branched through the pipe 1-1 through the filtration device (filter) 4 and the steam heating device (heat exchanger) 6. To flow. Each pipe 11 and 12 is provided for each rolling roll of the upper and lower F1~F4 stand hot finishing mill. Each branch pipe mixer 8 is provided, a pipe 3 of oil mixed with the pipe 2 of the hot-rolling oil is provided in the mixer 8. A header 9 is attached to the end of the mixed oil pipe 3, and a plurality of nozzles 10 are attached to the header 9.

  In the mixer 8, the hot rolling oil supplied from the hot rolling oil pipe 2 is mixed with the carrier water, and the mixed oil is fed from the nozzle 10 to the respective rolling rolls via the mixed oil pipe 3 and the header 9. Injected toward the surface.

  In this embodiment, the heating time of the carrier water by the heat exchanger 6 is 1 second. Moreover, the mixer 8 was arrange | positioned so that the time from mixing hot rolling oil and carrier water with the mixer 8 to the injection by the nozzle 10 may be about 6 seconds. The mixed oil was sprayed onto the surface of the rolling roll only during rolling.

The amount of carrier water flowing through the pipe 1-1 was 300 L / min in total, and conventional hot rolling oil mainly composed of synthetic ester was used, and the injection concentration was 0.4%.
Then, the temperature of the carrier water, the heating temperature, and the filter presence / absence conditions were changed, and the occurrence of slime in the header 9 and the nozzle 10, the clogging of the nozzle 10, and the occurrence of scale flaws in the rolled product were investigated. The test time was 24 hours. The survey results are summarized in Table 1.

表１における試番１，２は、キャリア水の水温が８℃未満であるため、キャリア水を加熱しなくとも、スライムやノズル詰まりが発生せず、製品スケール疵の発生もなかった。

In Test Nos. 1 and 2 in Table 1, since the water temperature of the carrier water was less than 8 ° C., no slime or nozzle clogging occurred and no product scale wrinkles occurred even if the carrier water was not heated.

  In Test Nos. 3 and 5, since the water temperature of the carrier water was 8 ° C. or higher and lower than 50 ° C., the carrier water was heated to 55 ° C. and 60 ° C. by the heat exchanger 6 and then supplied to the mixer 8. Thereby, generation | occurrence | production of slime and nozzle clogging could be prevented, and product scale flaws could be prevented.

  The trial numbers 4 and 6 are cases where the carrier water is not heated in the trial numbers 3 and 5. Nozzle clogging occurred due to slime generated after 8 hours and 4 hours respectively, and product scale wrinkles occurred.

  In trial No. 7, carrier water was heated to 90 ° C., and hot rolling oil was mixed at 80 ° C. or higher. Although generation of slime and prevention of nozzle clogging could be achieved, the amount of hot rolling oil adhering oil on the surface of the rolling roll decreased, and scale wrinkles occurred due to rough rolling of the rolling roll.

  Furthermore, trial number 8 is a case where the filter is unused in trial number 5. Although slime was not generated, nozzle clogging occurred due to algae contained in the carrier water, resulting in slight product scale wrinkles.

It is a graph which shows the result of having analyzed the total bacterial count ratio of bacteria, mold, etc. in the carrier water of each temperature using lake water as carrier water. It is a graph which shows the result of having measured the total bacterial count ratio after heating the carrier water of the flow rate of 300 L / min which is the total bacterial count ratio of 10000 at the water temperature of 25 degreeC to various temperature for 1 second. It is a graph which shows the investigation result of the relationship between the water temperature of carrier water, and the adhesion oil amount in the surface of a rolling roll. It is a graph which shows an example of the relationship between the water temperature of carrier water, and the hydrolysis rate of hot rolling oil. It is an equipment outline figure of an example of a supply device of an embodiment.

Explanation of symbols

0 Hot Rolling Oil Supply Device 1-1, 1-2 Carrier Water Piping 2 Hot Rolling Oil Piping 3 Mixed Oil Piping 4 Filtration Device 5-1, 5-2 Thermometer 6 Heating Device 7 Temperature Control Device 8 Mixer 9 Header 10 Nozzle

Claims (5)

  A method of mixing hot rolling oil and carrier water and supplying it to the surface of a hot rolling roll, and when the temperature of the carrier water is at least 8 ° C. or more and less than 50 ° C., the hot rolling oil and A hot rolling oil supply method comprising a heating step of heating the carrier water to a temperature of 50 ° C. or higher before mixing.   The method for supplying hot rolling oil according to claim 1, wherein the heating temperature of the carrier water is 80 ° C. or less.   The method for supplying hot rolling oil according to claim 1, further comprising a filtration step of filtering the carrier water through a filter before the heating step.   An apparatus for mixing hot rolling oil and carrier water with a mixer and supplying the hot rolling oil to a hot rolling roll, and heating the carrier water in the middle of a pipe for supplying the carrier water to the mixer An apparatus for supplying hot rolling oil, characterized by comprising means.   The hot rolling oil supply device according to claim 4, further comprising a thermometer for measuring a temperature of the carrier water on an inlet side and / or an outlet side of the heating unit.

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