JP2006263740A - Method and apparatus for supplying lubricating oil in cold rolling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of supplying lubricating oil in cold rolling which is excellent in the responsiveness of the supply control of the lubricating oil and by which high-quality products without seizure marks are manufactured. <P>SOLUTION: The method of supplying the lubricating oil is provided by which the undiluted solution of the lubricating oil whose fusing point is ≥20°C is supplied to the inlet side of the roll bite, the lubricating oil is supplied in the state of liquid by installing heating devices 23, 27 in a lubricating oil tank 20 and on a lubricating oil supply pipe 24 and the quantity of the oil to the roll bite is controlled by temperature control in accordance with the coefficient of friction and forward slip. Further, a sheet shape is also controllable by performing temperature control in the width direction on the basis the output from a sheet shape detecting device by arranging a plurality of lubricating oil nozzles 32 in the width direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and apparatus for supplying lubricating oil in cold rolling, and more particularly to a method and apparatus for supplying lubricating oil by a neat lubrication system that supplies a lubricating oil stock solution to a work roll.

  In cold rolling, emulsion lubrication is usually used except for stainless steel plates. However, many lubricant oils are wasted by emulsion lubrication, and when the rolling speed is increased, insufficient lubrication may occur and seizure may occur.

  As a technique for solving the problem of emulsion lubrication, there is neat lubrication in which a lubricating oil stock solution (hereinafter simply referred to as lubricating oil) is supplied to a roll and / or a steel plate. Although neat lubrication is an effective means for reducing friction, the conventional lubricating oil supply method has the following problems because the lubricating oil stock solution is supplied from the nozzle.

  (1) Excessive lubrication may cause slipping and wrinkles. (2) If the lubricating oil supply amount is reduced too much, the lubricating oil has a higher viscosity than the emulsion, so it does not spread over the entire roll or plate, and may cause seizure flaws in the parts where it is not supplied (non-uniform in the width direction). . (3) Lubricating oil spilling from the plate end and roll end is increased from the current level, and the yield is deteriorated particularly in direct lubrication. (4) In recirculation lubrication, although yield does not deteriorate as much as direct lubrication, it is difficult to remove impurities for reuse because of its high viscosity and easy inclusion of impurities.

  As a technique for solving the above-mentioned neat lubrication problem, a lubricating oil supply device for a work roll for rolling steel sheets, provided with a discharge port for supplying the lubricating oil close to the work roll with a gap of 5 mm or less is provided. There is a device. In this apparatus, lubricating oil is oozed out from the pores of the network structure of the discharge port and supplied to the work roll. The amount of lubricating oil supplied is controlled by adjusting the pressure applied to the lubricating oil. (For example, refer to Patent Document 1).

There is also a method of supplying lubricating oil by spraying as in Patent Document 2.
JP 2001-179313 A (4th page, 5th page, FIG. 1 and FIG. 4) Japanese Patent Application No. 2004-012678

  The neat lubrication method for rolling rolls in Patent Document 1 is effective for reducing the friction coefficient. However, since the lubricating oil oozes out from the pores and the pressure applied to the lubricating oil is adjusted to control the supply amount of the lubricating oil, the control response may be delayed. For this reason, there was a possibility that seizure flaws would occur.

  Further, in the technique of Patent Document 2, the lubricating oil is originally limited to liquid, and solid lubricating oil cannot be used at room temperature or in the usage environment around the rolling mill (ambient temperature). At present, many of the lubricating oils used in emulsion lubrication used in cold tandem rolling are solid lubricating oils at room temperature, and many high-performance lubricating oils are solid from the viewpoint of lubricity.

  The present invention provides a lubricating oil supply method and apparatus capable of producing a high-quality product having excellent responsiveness of lubricating oil supply control and no seizure flaws.

The lubricating oil supply method in the cold rolling of the present invention,
(1) In a lubricating oil supply method in cold rolling, in which a lubricating oil stock solution is sprayed from a lubricating oil nozzle into a mist with a compressed gas and supplied to the roll bite inlet side, a lubricating oil tank having a melting point of 20 ° C. or higher The lubricating oil is heated by a heating device provided in the lubricating oil tank and the lubricating oil supply pipe, and the lubricating oil from the outlet from the lubricating oil tank to the lubricating oil supply pipe is sprayed to the lubricating oil nozzle. Supply in liquid form, supply cooling water to at least the work roll on the exit side of the rolling mill, and remove the cooling water adhering to the roll surface on the exit side of the work roll and / or the metal plate surface on the exit side of the rolling mill with a draining device. It is characterized by that.

  Here, the lubricating oil stock solution is made of mineral oil, fat or synthetic lubricating oil, and includes those to which additives such as antioxidants and oiliness improvers are added. Solid lubricating oil is transformed into a liquid by heating, and the viscosity decreases as the temperature further increases. The higher the viscosity of the lubricating oil, the greater the amount of oil introduced into the roll bite and the lowering the friction coefficient. Therefore, the friction coefficient can be controlled by controlling the lubricating oil temperature.

(2) In the lubricating oil supply method of (1) above, the necessary friction coefficient or advanced rate is calculated according to the rolling material type and rolling schedule, the necessary lubricating oil viscosity is estimated from the numerical value, and the lubricating oil viscosity It is characterized by controlling the lubricating oil temperature so that

(3) In the lubricating oil supply method of (1) or (2) above, the friction coefficient or the advanced rate required for each stand is calculated by a tandem rolling mill, and the lubricating oil temperature is controlled for each stand. .

(4) In the lubricating oil supply method of (1), (2) or (3) above, in the rolling mill provided with a shape detection device on the stand exit side, a plurality of lubricating oil nozzles and lubricating oil supply pipes are arranged in the plate width direction. The friction coefficient required for each lubricating oil nozzle is estimated based on the plate shape detected by the shape detection device, and the required lubricating oil temperature is calculated from the estimated value, and the lubricating oil tank The lubricating oil temperature of each lubricating oil supply pipe is controlled independently for each lubricating oil supply pipe. If there are a plurality of lubricant nozzle outlets in the roll axis direction and the lubricant temperature can be controlled for each, the friction coefficient in the width direction can be controlled and the shape can be controlled. .

The lubricating oil supply device of the cold rolling mill of this invention is
(5) A lubricating oil supply device for supplying lubricating oil from the lubricating oil nozzle in the form of a mist with compressed gas to the roll bite inlet side and storing a lubricating oil stock solution having a melting point of 20 ° C. or higher A lubricating oil supply pipe connected to the lubricating oil tank, a lubricating oil nozzle connected to the lubricating oil supply pipe, a compressed gas tank, one end connected to the compressed gas tank, and the other end connected to the lubricating oil nozzle. A compressed gas supply pipe, a heating device installed in each of the lubricating oil tank and the lubricating oil supply pipe, respectively, for heating the lubricating oil stock solution into a liquid state, and a roll for supplying cooling water to at least a work roll provided on the delivery side of the rolling mill It is characterized by comprising a cooling device and a draining device for removing cooling water adhering to the roll surface on the work roll exit side and / or the metal plate surface on the exit side of the rolling mill.

(6) In the lubricating oil supply apparatus of (5) above, a necessary friction coefficient or advanced rate is calculated according to the rolling material type and rolling schedule, the necessary lubricating oil viscosity is estimated from the numerical value, and the lubricating oil viscosity It is characterized by comprising a lubrication control device for controlling the lubricating oil temperature by adjusting the output of the heating device.

(7) In the lubricating oil supply device of (6) above, in the tandem rolling mill, the necessary friction coefficient or advanced rate is calculated for each stand, and the output of the heating device is adjusted for each stand to control the lubricating oil temperature. A lubrication control device is provided.

(8) In the lubricating oil supply device according to (5), (6), or (7), the plurality of lubricating oil supply pipes connected to the lubricating oil tank and attached to the tip of each lubricating oil supply pipe, respectively. Necessary for each lubricating oil nozzle based on a plurality of lubricating oil nozzles arranged along the plate width direction, a plate shape detecting device arranged on the delivery side of the rolling mill, and a plate shape detected by the plate shape detecting device Lubrication control that estimates the required friction coefficient, calculates the required lubricating oil temperature from the estimated value, adjusts the output of the heating device of each lubricating oil supply pipe, and independently controls the lubricating oil temperature for each lubricating oil supply pipe And a device.

  In the lubricating oil supply method of (1), the solid lubricating oil stock solution is heated by a heating device installed in the lubricating oil tank and the lubricating oil supply pipe to be in a liquid state and sprayed from the lubricating oil nozzle in the form of a mist. And supply to the roll bite entry side. Currently, many of the lubricating oils used in emulsion lubrication of cold tandem rolling mills are solid at room temperature. Since it is difficult to use a solid lubricant in the air atomization method, it is difficult to use a solid lubricant in a use environment even if there is a lubricant having good lubricity. By using a heating device, it is possible to compensate for the disadvantage.

  In the lubricating oil supply method of the above (2) or (3), the viscosity can be changed by changing the temperature. Therefore, the temperature is controlled with the aim of changing the viscosity, and the viscosity in each stand and / or in the width direction. By controlling this, it becomes possible to control to an ideal friction coefficient. As a result, it is possible to prevent the occurrence of seizure flaws due to insufficient lubrication and to manufacture a high-quality product, and to further reduce the lubricating oil.

  In the lubricating oil supply method (4), the shape can be freely controlled by controlling the friction coefficient in the plate width direction, and a product having a required plate shape can be obtained.

  The lubricating oil supply devices of (5) to (8) can effectively carry out the lubricating oil supply methods of (1) to (4), respectively.

  In the present invention, solid lubricating oil (lubricating oil stock solution) is heated in a lubricating oil tank and a lubricating oil supply pipe in a normal temperature or in a use environment, transformed into a liquid, supplied to the tip of the lubricating oil nozzle, and not mixed with water. The lubricant is supplied to the roll bite inlet side in a sprayed state using compressed air.

  The inventors investigated the temperature of the current lubricating oil tank and the surroundings of the piping from the tank to the rolling mill at the cold rolling mill, and found that in the winter season, the temperature could drop to 20 ° C near the lubricating oil supply pipe. did. When the melting point of the lubricating oil is 20 ° C. or higher, even if the lubricating oil is heated in the lubricating oil tank and supplied to the lubricating oil supply pipe, if the supply amount is small as in the air atomizing method of the present invention, the lubricating oil is lubricated in winter. There is a possibility of solidifying in the oil supply pipe. Further, the temperature of the solidified lubricating oil is gradually increased to transform from solid to liquid via a solid-liquid coexisting sherbet, and (1) the supply amount of the lubricating oil can be controlled by the air atomization method. (2) An investigation was made as to whether it could be uniformly supplied to rolls and steel plates using refined palm oil having a melting point of 35 ° C. As a result, in the solid state, even if the air pressure is increased, the lubricating oil is hardly sprayed from the lubricating oil nozzle, or it is supplied in a lump form, so it turned out that it is difficult to supply the lubricating oil in the solid state did. In the liquid state, it was confirmed that there was no problem in spraying and uniform supply. Even in the case of a sherbet with solid-liquid coexistence, there was no problem with spraying. Concerning uniformity, compared to liquid, a part of the particle size slightly larger than the liquid was confirmed when the lubricating oil adhered to the roll or steel plate, but even when rolled as it is, it does not become uneven, and even a little sherbet shape It was confirmed that there was no problem in rolling if it was possible to heat up to the above. In other words, since the air atomization method can be realized when the melting point is exceeded, the lubricating oil melting point is defined as 20 ° C. or more in consideration of the use environment.

  In the case of cold tandem rolling, the current emulsion lubrication provides a sufficient cooling effect due to the high thermal conductivity of water, but the air atomizing method cannot be expected to provide a sufficient cooling effect. In order to prevent seizure, cooling water is sprayed on the work roll from the exit side of the rolling mill.

  When the scattered cooling water adheres to the surface of the work roll, adhesion of the lubricating oil to the steel plate is hindered, so a draining plate is provided close to the work roll exit side. The draining plate prevents the splashing cooling water from adhering to the work roll and ensures that the lubricating oil adheres to the steel plate. Moreover, the draining plate prevents cooling water and fumes from being scattered around the rolling mill, and maintains a good work and equipment environment.

  Lubricating oil temperature can be controlled based on the coefficient of friction or an advanced rate that is closely related to the coefficient of friction. The work roll peripheral speed is measured by a work roll rotation speed detection device, and the plate speed is measured by a plate speed detection device on the delivery side of the rolling mill. These measurement results are sent to the lubrication control device, and the relationship between the friction coefficient or the advanced rate and the lubricating oil temperature is obtained in advance from these measurement results. When the lubricating oil temperature is low, a large amount of lubricating oil enters the roll bite, the oil film thickness increases, the friction coefficient decreases, and the advance rate decreases. On the other hand, when the lubricating oil temperature is high, less lubricating oil enters the roll bite, the oil film thickness becomes thin, the friction coefficient increases, and the advanced rate increases. A required lubricating oil temperature is obtained based on this relationship, and the temperature is controlled by adjusting the output of the lubricating oil heater. Thereby, even if the amount of lubricating oil supplied is constant, the oil film of the roll bite can be maintained at a required thickness. Since the necessary friction coefficient and advanced rate vary depending on the type of rolling material, rolling reduction schedule, and the like, it is preferable to prepare a table and correction terms according to them.

  Also, the amount of lubricating oil supplied can be controlled based on an advanced rate that is closely related to the friction coefficient. Now that we have two types of the control end of the temperature and supply amount of the lubricating oil, these selections it is sufficient to decide whether to use any conditions which advance in consideration of the cost.

  FIG. 1 shows an example of an apparatus for carrying out the lubricating oil supply method. Hereinafter, description will be made assuming that the metal plate is a steel plate. The rolling mill 10 is a four-high rolling mill provided with a work roll 12 and a backup roll 14.

The rolling mill 10 includes a lubricating oil tank 20 that stores lubricating oil having a melting point of 20 ° C. or higher. In the lubricating oil tank 20, a lubricating oil heater 21 for heating the lubricating oil and a lubricating oil temperature detecting device 23 such as a thermocouple are provided. The lubricating oil heater 21 is connected to a heater power source 22, and the heater power source 22 can adjust its output. A lubricating oil supply pipe 24 is connected to the lubricating oil tank 20, and a lubricating oil pump 25 and a lubricating oil pressure adjustment valve 26 are attached to the lubricating oil supply pipe 24. A lubricating oil heater 27 and a lubricating oil temperature detecting device 29 similar to those of the lubricating oil tank 20 are attached to a part of the lubricating oil supply pipe 24. The output of the heater power supply 28 connected to the lubricant heater 27 can also be adjusted.

  A lubricant header 30 is disposed on the entry side of the rolling mill 10, and a lubricant supply pipe 24 is connected to the lubricant header 30. The lubricant header 30 is provided with a plurality of lubricant oil nozzles 32 along the width direction of the plate while being close to the steel plate 1 and the work roll 12. A compressed air tank 40 is connected to the lubricating oil nozzle 32 via a compressed air supply pipe 42. An air flow rate adjustment valve 46 is attached to the compressed air supply pipe 42.

  The rolling mill 10 includes a lubrication control device 60 that includes a computer. In the lubrication control device 60, the relationship between the lubricant supply amount and the friction coefficient or the advanced rate and the lubricant temperature is stored in advance as a table for each type of rolling material and each rolling reduction schedule. The lubrication control device 60 outputs operation signals to the lubricating oil pressure adjustment valve 26, the air flow rate adjustment valve 46, and the cooling water amount adjustment valve 56 to adjust the supply amount of the lubricating oil and cooling water, and to the heater power sources 22 and 28. Outputs an operation signal and adjusts the lubricating oil temperature.

  A plate speed detection device 62 is disposed on the exit side of the rolling mill 10, and a rotation speed detection device (not shown) is attached to the work roll 12. The detected values of the rolling mill delivery side plate speed and work roll rotation speed are output to the lubrication control device 60, and the lubrication control device 60 calculates the advanced rate based on these detected values.

  In the rolling mill 10 configured as described above, lubricating oil is sent from the lubricating oil tank 20 to the lubricating oil header 30 via the lubricating oil supply pipe 24 by the lubricating oil pump 25. The solid lubricating oil at normal temperature or in the use environment is transformed into a liquid by the lubricating oil heaters 21 and 27 installed in the lubricating oil tank 20 and the lubricating oil supply pipe 24. The lubricating oil that has become liquid flows from the lubricating oil header 30 into the lubricating oil nozzle 32. On the other hand, the compressed air dried from the compressed air tank 40 is supplied to the lubricating oil nozzle 32 through the compressed air supply pipe 42. The lubricating oil is mixed with the compressed air and ejected from the lubricating oil nozzle 32 to be sprayed and supplied to the work roll 12 and the steel plate 1. Since it is neat lubrication, the friction coefficient can be effectively reduced.

  The lubrication control device 60 is preset with a lubricant supply amount and a lubricant temperature based on the type of rolling material and the rolling schedule. During rolling, the lubricating oil pressure control valve 36 maintains the lubricating oil pressure constant, and the air flow control valve 46 adjusts the air flow rate to maintain the lubricating oil supply amount at a set value. Estimate the viscosity of the lubricating oil supplied to the roll tool, that is, the lubricating oil temperature, from the advanced rate obtained from the detected values of the plate speed and the work roll rotation speed on the delivery side of the rolling mill, and the heater power supply so that the lubricating oil temperature becomes the set temperature 22 and 28 are controlled. The temperature of the lubricating oil in the lubricating oil supply pipe detected by the lubricating oil temperature detecting device 21 is sent to the lubricating control device 60 for feedback control.

  In the embodiment of the present invention, a plurality of cooling water nozzles 34 are arranged along the roll axis direction on the work roll exit side of the rolling mill 10 to cool the work roll 12 with water. The cooling water is sent from the cooling water tank 50 through the cooling water supply pipe 52 to the cooling water header 34 by the cooling water pump 54. The cooling water is sprayed on the exit surface of the work roll 12 from a plurality of cooling water nozzles 36 attached to the cooling water header 24 along the roll axis direction, thereby cooling the work roll 12. The amount of cooling water is controlled by a cooling water flow rate adjustment valve 56.

  When the scattered cooling water adheres to the surface of the work roll 12, adhesion of the lubricating oil to the steel plate 1 is hindered, so the draining plate 38 is provided close to the work roll exit side. The draining plate 38 is located on the downstream side of the cooling water nozzle 36 in the roll rotation direction. The gap between the work roll surface and the front end surface of the draining plate 38 is about 0 to 5 mm. Therefore, the draining plate 38 prevents the scattered cooling water from adhering to the work roll 12 and ensures that the lubricating oil adheres to the steel plate 1. Further, the draining plate 38 prevents cooling water and fumes from being scattered around the rolling mill and maintains a good work and equipment environment. When the draining plate 38 is made of a soft material, for example, plastic, the work roll surface and the tip of the draining plate 38 may be in contact with each other (gap is 0 mm).

  In a tandem rolling mill, a desired friction coefficient and an advanced rate may differ in each stand. For example, since the meandering is a problem in the former stage, the friction coefficient is set slightly higher, and in the latter stage, seizure is a problem, so the friction coefficient is set lower. In order to realize these, it is possible to control the lubricating oil temperature for each stand. Since the friction coefficient increases when the lubricating oil temperature is high, the lubricating oil temperature may be increased in the first stage and the lubricating oil temperature may be decreased in the second stage. Even if there is only one lubricating oil tank, the temperature at the time of outflow from the lubricating oil tank is constant and the lubricating oil with different temperatures at each stand is corrected by correcting the temperature in the lubricating oil supply pipe connected to each stand. Can be supplied.

  Next, another embodiment of the present invention will be described. If a plurality of lubricating oil supply pipes are installed in the plate width direction and a heating device is installed independently for each, it is possible to supply lubricating oils having different temperatures in the plate width direction. By changing the lubricating oil temperature in the plate width direction, the amount of oil film in the roll bite changes due to the change in viscosity, so that it is possible to intentionally create medium elongation and end elongation. In particular, when high-tensile rolling is performed, rolling may be performed in an end-elongated manner in order to avoid plate breakage due to minute cracks at the plate end, but this embodiment is also effective for this purpose.

  FIG. 2 shows an example of an apparatus for carrying out the lubricating oil supply method. In FIG. 2, devices and members similar to those shown in FIG. 1 are assigned the same reference numerals, and detailed descriptions thereof are omitted.

  Five lubricating oil supply pipes 24a to 24e are connected to the lubricating oil tank 20, and lubricating oil pumps 25a to 25e and lubricating oil pressure control valves 26a to 26e are attached to the respective lubricating oil supply pipes 24a to 24e. ing. Lubricating oil heaters 27a to 27e and lubricating oil temperature detecting devices 29a to 29e are attached to part of the lubricating oil supply pipes 24a to 24e. The heater power supplies 28a to 28e connected to the lubricating oil heaters 27a to 27e can independently adjust the output.

  Lubricating oil headers 30a to 30e are arranged on the entry side of the rolling mill 10, and lubricating oil supply pipes 24a to 24e are connected to the lubricating oil headers 30a to 30e, respectively. The lubricating oil headers 30a to 30e are provided with a plurality of lubricating oil nozzles 32a to 32e along the width direction of the plate while being close to the steel plate 1 and the work roll 12. Each of the lubricating oil nozzles 32a to 32e is composed of a plurality, and is arranged toward both ends of the plate, the center portion of the plate width, and an intermediate portion thereof. A compressed air tank 40 is connected to the lubricating oil nozzles 32 a to 32 e via a compressed air supply pipe 42. An air flow rate adjustment valve 46 is attached to the compressed air supply pipe 42.

  A draining plate 39 is disposed on the exit side of the rolling mill 10. A plate shape detection device 64 that detects the shape of the steel plate 1 is provided on the downstream side of the draining plate 39. The gap between the steel plate surface and the tip surface of the draining plate 39 is about 0 to 5 mm. The cooling water adhering to the surface of the cooling water steel plate is removed by the draining plate 39, so that a large amount of fume is not scattered around the rolling mill, so there is almost no environmental problem and the plate shape detection device 64 can be installed. It is.

  In the rolling mill configured as described above, the plate shape on the outlet side of the rolling mill is detected by the plate shape detection device 64. Based on the detection result, the heater power supplies 28a to 28e are independently adjusted in output and supplied with lubricating oil having different temperatures in the plate width direction to feedback control the plate shape.

  The present invention is not limited to the above embodiment. For example, the lubricating oil supply amount may be controlled while maintaining the lubricating oil temperature constant. In addition to the draining plate, the draining device may be an injection device that injects non-combustible compressed gas such as compressed air onto the work roll surface and / or the metal plate surface. In the second embodiment, a draining plate may be provided on the exit side of the work roll. Furthermore, in order to reliably form an oil film of the required thickness on the surface of the metal plate, an oil film thickness detection device is arranged on the upper or lower surface of the metal plate on the rolling mill exit side, and the oil film thickness detection value is set. Based on this, the lubricating oil temperature or the lubricating oil supply amount can be controlled. The compressed gas supplied to the lubricating oil nozzle may be non-combustible gas such as nitrogen gas in addition to air. The number of lubricating oil supply pipes connected to the lubricating oil tank may be 2 to 4, or 6 to 8. It is also possible to arrange the lubricating oil nozzle at a distance from the roll bite to the upstream side of the rolling mill. In addition to steel, the rolled material may be a metal such as titanium, aluminum, magnesium, copper, or an alloy of these metals.

  The coil was lubricated and rolled by the air atomization method of the present invention using a single stand 4Hi experimental mill. Palm oil was used as the lubricating oil. The lubricating oil tank is equipped with a lubricating oil heater, which can be controlled automatically. For the sake of simplicity, a ribbon heater is wound around the lubricating oil supply pipe, and a thermocouple is attached to the lubricating oil supply metal pipe to perform ON / OF control with respect to the set temperature. Cooling water was supplied to the work roll. In addition, after setting the rolling speed to 1200 m / min, an experiment in which the lubricating oil temperature was changed in advance by the air atomization method of the present invention was performed, the oil film was measured with an oil film thickness meter, and the oil film thickness was freely controlled by temperature control. It was confirmed that it was possible, and the required minimum oil film thickness was obtained at the same time. In the experiment, when the rolling speed was increased to 1200 m / min, steady rolling was started, rolling was performed for 20 minutes under the conditions, and then the experiment was terminated with the speed reduced. Although the coil was confirmed after rolling, the occurrence of seizure flaws was not observed.

  Further, it was confirmed that when the lubricating oil temperature was lowered from 60 ° C. to 40 ° C., the same oil film thickness could be realized with a supply amount 0.85 times the lubricating oil supply amount at 60 ° C. It is widely known that palm oil is solid at room temperature and is a lubricating oil that can withstand high-speed rolling. The present invention has made it possible to use such solid high performance oils.

  Using the rolling mill of Example 1, five lubricating nozzles are arranged at equal intervals in the width direction, and a heating device is installed in each supply pipe to change the temperature of the lubricating oil discharged from the nozzles in the width direction. I was able to. The temperature was symmetrical in the width direction with respect to the central nozzle, and the central temperature was constant at 50 ° C. The temperature of the nozzle at the plate end and the nozzle at the middle point between the plate end and the center (hereinafter referred to as the intermediate nozzle) is changed to -10 ° C, -5 ° C, + 5 ° C, + 10 ° C in comparison with the temperature of the center nozzle, and all combinations The shape was visually observed after rolling and the effect was confirmed. When the temperature at the end of the plate is low, it tends to be extended at the end, and when it is high, it tends to be extended at an intermediate rate. By applying a temperature distribution in the width direction, it can be confirmed that the shape can be freely changed, and if this characteristic is used, the shape can be controlled by measuring the shape on the delivery side of the rolling mill and feeding back to the lubricating oil temperature. I was able to confirm that it was possible.

It is an apparatus block diagram which shows an example of the apparatus which implements the lubricating oil supply method of this invention. It is an apparatus block diagram which shows the other example of the apparatus which implements the lubricating oil supply method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate (steel plate) 10 Rolling machine 12 Work roll 14 Backup roll 20 Lubricating oil tank 21, 27 Lubricating oil heater 22, 28 Heater power supply 23, 29 Lubricating oil temperature detection device 24 Lubricating oil supply pipe 25 Lubricating oil pump 26 Lubricating oil Pressure control valve 30 Lubricating oil header 32 Lubricating oil nozzle 34 Cooling water header 36 Cooling water nozzle 38, 39 Drain plate 40 Compressed air tank 42 Compressed air supply pipe 46 Air flow control valve 50 Cooling water tank 54 Cooling water pump 56 Cooling water flow 56 Control valve 60 Lubricating oil supply control device 62 Plate speed detection device 64 Plate shape detection device

Claims (8)

  In a lubricating oil supply method in cold rolling, in which a lubricating oil stock solution is sprayed from a lubricating oil nozzle into a mist with a compressed gas and supplied to the roll bite inlet side, lubricating oil having a melting point of 20 ° C. or higher is stored in a lubricating oil tank. The lubricating oil is heated by a heating device provided in the lubricating oil tank and the lubricating oil supply pipe, and the lubricating oil from the outlet from the lubricating oil tank to the lubricating oil supply pipe to the lubricating oil nozzle is made into a liquid. Supplying and supplying cooling water to at least the work roll on the exit side of the rolling mill, and removing the cooling water adhering to the roll surface on the work roll exit side and / or the metal plate surface on the exit side of the rolling mill with a draining device Lubricating oil supply method in cold rolling.   Calculate the necessary friction coefficient or advanced rate according to the rolling material type and rolling schedule, estimate the necessary lubricating oil viscosity from the numerical value, and control the lubricating oil temperature so as to be the lubricating oil viscosity The lubricating oil supply method in the cold rolling according to claim 1.   The lubrication in cold rolling according to claim 2, wherein when the rolling equipment to be used is a tandem rolling mill, a necessary friction coefficient or an advanced rate is calculated for each stand, and the lubricating oil temperature is controlled for each stand. Oil supply method.   In a rolling mill equipped with a shape detection device on the stand exit side, a plurality of lubricating oil nozzles and a lubricating oil supply pipe are installed along the plate width direction, and the lubricating oil nozzle is based on the plate shape detected by the shape detecting device. The necessary friction coefficient is estimated every time, the necessary lubricating oil temperature is calculated from the estimated value, and the lubricating oil temperature of the lubricating oil tank and each lubricating oil supply pipe is controlled independently for each lubricating oil supply pipe. 4. The method for supplying lubricating oil in cold rolling according to any one of claims 1 to 3, wherein the shape is controlled by:   A lubricating oil supply device for injecting lubricating oil from the lubricating oil nozzle in the form of a mist in the form of a compressed gas to the roll bite inlet side and storing a lubricating oil stock solution having a melting point of 20 ° C. or higher; and a lubricating oil Lubricating oil supply pipe connected to the tank, lubricating oil nozzle connected to the lubricating oil supply pipe, compressed gas tank, one end connected to the compressed gas tank, and the other end connected to the lubricating oil nozzle connected to the compressed gas supply pipe A heating device installed in the lubricating oil tank and a lubricating oil supply pipe, respectively, for heating the lubricating oil stock solution into a liquid state, a roll cooling device for supplying cooling water to at least a work roll provided on the rolling mill outlet side, A lubricating oil supply device for a cold rolling mill, comprising: a draining device for removing cooling water adhering to a roll surface on the work roll exit side and / or a metal plate surface on the roll exit side.   The means for calculating the required friction coefficient or advanced rate according to the rolling material type and rolling schedule, the means for estimating the required lubricating oil viscosity from the numerical value, and adjusting the output of the heating device to achieve the lubricating oil viscosity 6. A lubricating oil supply device for a cold rolling mill according to claim 5, further comprising a lubrication control device for controlling the lubricating oil temperature.   Lubricating oil supply device for a tandem rolling mill, a means for calculating a friction coefficient or an advanced rate required for each stand, and a lubrication control device for controlling the lubricating oil temperature by adjusting the output of the heating device for each stand The lubricating oil supply device for a cold rolling mill according to claim 6.   A plurality of lubricating oil supply pipes connected to the lubricating oil tank, a plurality of lubricating oil nozzles attached to the tip of each lubricating oil supply pipe and arranged along the plate width direction, and a rolling mill outlet An arranged plate shape detecting device, a friction coefficient estimating means required for each of the lubricating oil nozzles based on the plate shape detected by the plate shape detecting device, and a required lubricating oil temperature calculating means from the estimated value. 8. A lubrication control device that adjusts the output of the heating device of each lubricating oil supply pipe and controls the lubricating oil temperature independently for each lubricating oil supply pipe. The lubricating oil supply apparatus of the cold rolling mill of Claim 1.

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