JP2005118833A - Cold rolling method, and cold rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold rolling method for cold-rolling a steel plate with both sides thereof having excellent quality in a single drive type cold rolling mill, and a cold rolling mill suitable for manufacturing a steel plate with both sides thereof having excellent quality. <P>SOLUTION: In the cold rolling mill having at least a pair of upper and lower work rolls, the torque during the rolling operation applied to each drive shaft of the upper and lower work rolls is measured, and lubricating oil is independently fed in an optimum amount to the upper and lower work rolls according to the measured torque. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cold rolling method and a cold rolling mill for use in the production of a steel plate as a material to be rolled, particularly a hard steel plate and a thin steel plate having excellent surface quality.

  In recent years, in cold rolling mills that manufacture cold-rolled steel sheets and the like, demand for hardened and thinned sheet materials has been increasing. In these plate materials, the surface quality of the plate is regarded as important. Especially, when rolling at high speed, heat scratches and chattering occur due to the change in the lubrication state between the plate material and the work roll. It is difficult to obtain a plate material having a low productivity. In order to produce these plate materials at high speed while maintaining stable and good surface quality, it is important to improve the lubricity during rolling.

  As an example of improving the lubricity that affects the surface quality of a plate material in a cold rolling mill, Patent Document 1 discloses that the upper and lower sides of a tandem cold strip mill The flow rate of the rolling oil supplied to each work roll is calculated so that the current deviation value is calculated by detecting the motor current value of the work roll, and the rolling oil lubrication of each work roll becomes uniform according to the calculated current deviation value. A method for controlling the above is disclosed. This method is applied to so-called twin drive type rolling in which the upper and lower work rolls are driven by separate motors, and is applied to single drive type rolling in which the upper and lower work rolls are driven by a single motor via a gear. Cannot apply the technique of Patent Document 1.

  Patent Document 2 provides a bright steel plate with a difference in the supply amount of lubricating oil between the upper work roll and the lower work roll of the cold rolling mill, with the work roll peripheral speed on the side with the smaller supply amount being the high peripheral speed. A method of cold rolling is disclosed. This method is intended to obtain a steel sheet with high glossiness only on one side, so-called different peripheral speed rolling in which the upper work roll and the lower work roll are rolled at different peripheral speeds. This is a method of reducing the supply amount of lubricating oil. The different peripheral speed rolling method of Patent Document 2 can gloss only one side, but cannot be applied to the manufacture of a steel sheet having the same gloss on both sides.

Prior art document information relating to the present application includes the following.
Japanese Examined Patent Publication No. 4-45243 JP-A-10-29002

  The present invention provides a cold rolling method for cold rolling a steel plate having high quality on both sides in a single drive type cold rolling mill, and a cold rolling mill suitable for manufacturing a steel plate having high quality on both sides. For the purpose.

In order to achieve the object of the present invention, the cold rolling method of the present invention comprises a cold rolling method of rolling a material to be rolled by a cold rolling mill having at least one pair of upper and lower work rolls. A cold rolling method characterized in that the rolling torque acting on each drive shaft is measured and lubricating oil is independently supplied to each of the upper and lower work rolls in accordance with the measured torque in an optimal amount. Item 1), or in a cold rolling method in which a material to be rolled is rolled by a cold rolling mill having at least a pair of upper and lower work rolls, and measuring the rolling torque acting on the respective drive shafts of the upper and lower work rolls. Then, the measured torque data is output to the lubricating oil supply control means, and based on the input torque measurement data, the lubricating oil supply control means optimally lubricates each of the upper and lower work rolls. A cold rolling method characterized in that the amount of oil is calculated, the calculated data is output to the lubricating oil supply amount adjusting means, and the lubricating oil is automatically supplied to each of the upper and lower work rolls independently and in an optimum amount. (Claim 2).

Further, the cold rolling mill of the present invention supplies at least a pair of upper and lower work rolls, a torque measuring means for rolling the drive shafts of the upper and lower work rolls, and supplies lubricating oil to each of the upper and lower work rolls. Lubricating oil supply means, lubricating oil supply amount adjusting means for adjusting the amount of lubricating oil supplied to each of the upper and lower work rolls, and lubricating oil injection means for injecting lubricating oil to each of the upper and lower work rolls Cold rolling mill (Claim 3), or at least a pair of upper and lower work rolls, torque measuring means for rolling the drive shafts of the upper and lower work rolls, and optimum lubricating oil based on torque measurement data The lubricating oil supply control means for calculating and outputting the amount of oil, the lubricating oil supply means for supplying the lubricating oil to the upper and lower work rolls, and the optimum lubrication received from the lubricating oil supply control means. Lubricating oil supply amount adjusting means for adjusting the amount of lubricating oil supplied to each of the upper and lower work rolls according to the amount of lubricating oil, and lubricating oil injection means for injecting lubricating oil to each of the upper and lower work rolls It is a cold rolling mill (Claim 4).

  When cold rolling a sheet material such as a steel sheet, which is a material to be rolled, using the single drive type cold rolling method and the cold rolling mill of the present invention, the lubricating oil is changed according to the respective torques of the upper and lower work rolls. Since an appropriate amount is supplied to the work roll, there is no occurrence of heat scratching or chattering, and a plate material having high quality on both sides can be obtained.

  The present inventors have intensively studied, measured the torque acting on the drive shafts of the upper and lower work rolls of the cold rolling mill, and in accordance with the measured torque, each of the upper and lower work rolls was independently supplied with the optimum amount of lubricating oil. The present invention was completed by discovering that a plate material having high quality on both sides can be obtained by supplying. The present invention will be described below.

  When cold-rolling a plate material such as a steel plate as a material to be rolled, heat scratching, chattering, and the like occur due to a change in the lubrication state between the plate material and the work roll. In twin drive rolling, in which the upper and lower work rolls are independently driven by separate motors, the motor current values of the upper and lower work rolls are detected, and a large change occurs in each current value to change the lubrication state. Can be confirmed. However, in single drive rolling in which the upper and lower work rolls targeted by the present invention are driven by a single motor through gears, the lubrication state changes of the upper and lower work rolls even if the motor current value is detected. Can not be confirmed. Therefore, in the present invention, the torque during rolling acting on the respective drive shafts of the upper and lower work rolls is measured, and lubricating oil is independently applied to the upper and lower work rolls independently according to the change in the measured torque value. By supplying in an amount, a uniform lubricating state can be obtained.

  The value of the torque at the time of rolling of each work roll can be measured as follows, for example. That is, a strain gauge is attached to the surface of the drive shaft of each work roll, the strain on the surface of the drive shaft is detected, and the torque value during rolling is calculated. In addition, torque measurement means such as a torque meter may be provided on the drive shaft to calculate the torque value during rolling. Based on the calculated torque value, an appropriate amount of lubricating oil is supplied from the lubricating oil supply system to the work roll.

Hereinafter, embodiments of a cold rolling method and a cold rolling mill according to the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of an embodiment of a cold rolling mill of the present invention. In order to simplify the description, the case of a pair of upper and lower work rolls will be described in the figure, but it goes without saying that the present invention can also be applied to a tandem mill in which two or more pairs of work rolls are arranged. In FIG. 1, 1a is an upper work roll, 1b is a lower work roll, 2a is an upper backup roll, 2b is a lower backup roll, and these four rolls constitute one rolling stand. 3 is a mixing tank, 4 is a circulation pump, and 5 is a feeder pump, and these constitute a lubricating oil supply means. 6a is a lubricating oil flow rate adjusting valve for the upper surface of the plate, 6b is a lubricating oil flow rate adjusting valve for the lower surface of the plate, 6c is a lubricating oil flow rate adjusting valve for the lower roll, 7a is a lubricating oil flow meter for the upper surface of the plate, and 7b is a lubricant for the lower surface of the plate. An oil flow meter, 7c is a lubricating oil flow meter for the lower roll, 8a is a lubricating oil pressure meter for the upper surface of the plate, 8b is a lubricating oil pressure meter for the lower surface of the plate, and 8c is a lubricating oil pressure meter for the lower roll. Lubricating oil supply amount adjusting means is configured. 9a is a plate upper surface lubricant injection nozzle, 9b is a plate lower surface lubricant injection nozzle, and 9c is a lower roll lubricant injection nozzle, and these constitute the lubricant injection means. The lubricating oil flow rate adjusting valve 6c, the lubricating oil flow meter 7c, the lubricating oil pressure gauge 8c, and the lubricating oil injection nozzle 9c provided for the lower roll are such that the lubricating oil supplied to the lower surface of the plate is likely to drop due to gravity, and the upper surface side of the plate It is an auxiliary device group for supplying a sufficient amount of lubricating oil to the lower surface of the plate, and is equivalent to the upper surface of the plate. If a sufficient amount can be supplied, it is not necessary to provide these device groups. These lubricating oil supply means, lubricating oil supply amount adjusting means, and lubricating oil injection means constitute a lubricating oil supply system. 10a is a drive shaft for the upper work roll, 10b is a drive shaft for the lower work roll, and 11 is a torque measuring device which is a torque measuring means. Reference numeral 20 denotes a plate material which progresses from right to left in FIG.

  When rolling the plate material 20, the distortion of the surface of the drive shaft is detected by strain gauges (not shown) attached to the drive shafts 10 a and 10 b of the upper work roll 1 a and the lower work roll 1 b, and the detection result is sent to the torque measuring device 11. Output. The torque measuring device 11 is provided with arithmetic processing means such as a computer, and the distortion of the surface of the drive shaft detected by each of the drive shafts 10a and 10b is calculated based on the torque of each of the upper work roll 1a and the lower work roll 1b. The value is calculated and displayed on a display means such as a display (not shown) provided in the torque measuring device 11. When the torque values of the upper work roll 1a and the lower work roll 1b displayed on the display means vary, for example, the torque value of one work roll is larger than the torque value of the other work roll. In this case, the lubrication state of the larger work roll becomes poor. Therefore, as shown below, the amount of lubricating oil supplied to the upper work roll 1a and the lower work roll 1b is adjusted, and the upper work roll is adjusted. The lubrication state in 1a and the lower work roll 1b is made uniform.

  Based on the torque value displayed on the display means of the torque measuring device 11, the operator uses the respective lubricant flow meters 7a, 7b, 7c for the plate upper surface, the plate lower surface, and the lower roll and the respective lubricant pressures. While monitoring the total 8a, 8b, 8c, the lubricating oil supplied from the mixing tank 3 via the circulation pump 4 and the feeder pump 5 is opened and closed with the respective lubricating oil flow rate adjusting valves 6a, 6b, 6c. Lubricating oil injection nozzles 9a, 9b and 9c are sprayed in appropriate amounts to supply lubricating oil to the plate upper surface, the plate lower surface and the lower roll, so that the upper and lower work rolls 1a and 1b are evenly lubricated. To do.

  In FIG. 1, the operator operates the lubricating oil supply system based on the torque value displayed on the display means of the torque measuring device 11, so that an appropriate amount of lubricating oil is applied to the plate upper surface, the plate lower surface, and the lower roll. However, it is also possible to automate the lubricating oil supply system and supply an appropriate amount of lubricating oil without any manual labor.

  FIG. 2 shows an outline of another embodiment of the rolling mill of the present invention. In FIG. 2, 16a, 16b, and 16c are lubricating oil flow rate automatic adjustment valves for the plate upper surface, the plate lower surface, and the lower roll, respectively, and constitute lubricating oil supply amount adjusting means. Reference numeral 12 denotes lubricating oil supply control means. Other configurations are the same as in FIG. When rolling the plate material 20, the distortion of the surface of the drive shaft is detected by strain gauges (not shown) attached to the drive shafts 10 a and 10 b of the upper work roll 1 a and the lower work roll 1 b in the same manner as in FIG. Is output to the torque measuring device 11 provided with arithmetic processing means such as a computer. In the torque measuring device 11, the distortion of the surface of the drive shaft detected by the drive shafts 10a and 10b is calculated as the torque value of each of the upper work roll 1a and the lower work roll 1b. The torque measuring device 11 outputs the data calculated in this way to the lubricating oil supply control means 12 by the measurement data output means. The lubricating oil supply control means 12 is also provided with arithmetic processing means such as a computer, in order to obtain the optimum lubricating state of the upper and lower work rolls based on the torque value data input via the measurement data input means. Lubricating oil supply amount is calculated. Next, the torque measuring device 11 uses the lubricating oil supply amount data calculated by the output means as the lubricating oil supply amount adjusting means, the plate upper surface lubricating oil flow automatic adjustment valve 16a, the plate lower surface lubricating oil flow automatic adjustment valve 16b, The lower roll lubricating oil flow rate automatic adjustment valve 16c is output to automatically open and close each valve, and an appropriate amount of lubricating oil is injected from each of the lubricating oil injection nozzles 9a, 9b, 9c, the plate upper surface, the plate Lubricating oil is supplied to the lower and lower rolls to make the lubrication state of the upper work roll 1a and the lower work roll 1b uniform.

  By using the cold rolling method and the cold rolling mill of the present invention, in a single drive type cold rolling mill, a steel plate having high quality on both sides of the plate is produced without causing heat scratching or chattering during rolling. It can be produced with high productivity.

Schematic showing an embodiment of a rolling mill of the present invention Schematic which shows other embodiment of the rolling mill of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a: Upper work roll 1b: Lower work roll 2a: Upper backup roll 2b: Lower backup roll 3: Mixing tank 4: Circulation pump 5: Feeder pump 6a: Lubricating oil flow adjustment valve for board upper surface 6b: Lubrication for board lower surface Oil flow adjustment valve 6c: Lubricating oil flow adjustment valve for lower roll 7a: Lubricating oil flow meter for plate upper surface 7b: Lubricating oil flow meter for lower plate surface 7c: Lubricating oil flow meter for lower roll 8a: Lubricating oil for plate upper surface Pressure gauge 8b: Lubricating oil pressure gauge for plate lower surface 8c: Lubricating oil pressure gauge for lower roll 9a: Lubricating oil injection nozzle for plate upper surface 9b: Lubricating oil injection nozzle for plate lower surface
9c: Lubricating oil injection nozzle for lower roll 10a: Upper roll drive shaft 10b: Lower roll drive shaft 11: Torque measuring device (measuring means)
12: Lubricating oil supply control means 16a: Automatic oil flow rate adjusting valve for plate upper surface 16b: Lubricating oil flow automatic adjusting valve for plate lower surface 16c: Lubricating oil flow automatic adjusting valve for lower roll 20: Plate material

Claims (4)

  In a cold rolling method of rolling a material to be rolled by a cold rolling mill having at least a pair of upper and lower work rolls, the torque during rolling acting on the respective drive shafts of the upper and lower work rolls was measured and measured. A cold rolling method characterized in that lubricating oil is independently supplied to the upper and lower work rolls in an optimum amount according to torque.   In a cold rolling method of rolling a material to be rolled by a cold rolling mill having at least a pair of upper and lower work rolls, the torque during rolling acting on the respective drive shafts of the upper and lower work rolls was measured and measured. Torque data is output to the lubricating oil supply control means, and the lubricating oil supply control means calculates the optimum amount of lubricating oil for each of the upper and lower work rolls based on the input torque measurement data. A cold rolling method characterized in that the lubricating oil is automatically supplied to each of the upper and lower work rolls independently and in an optimum amount by outputting to the supply amount adjusting means.   At least one pair of upper and lower work rolls, means for measuring torque during rolling of the respective drive shafts of the upper and lower work rolls, lubricating oil supply means for supplying lubricating oil to the upper and lower work rolls, and upper and lower work rolls A cold rolling mill comprising: a lubricating oil supply amount adjusting means for adjusting the amount of lubricating oil supplied to each of the first and second work rolls; and a lubricating oil injection means for injecting the lubricating oil to each of the upper and lower work rolls.   At least a pair of upper and lower work rolls, a torque measuring means for rolling the drive shafts of the upper and lower work rolls, and a lubricating oil supply that calculates and outputs an optimum amount of lubricating oil based on torque measurement data Control means, lubricating oil supply means for supplying lubricating oil to each of the upper and lower work rolls, and lubrication to be supplied to each of the upper and lower work rolls according to the optimum amount of lubricating oil received from the lubricating oil supply control means A cold rolling mill comprising: a lubricating oil supply amount adjusting means for adjusting the amount of oil; and a lubricating oil injection means for injecting lubricating oil to each of the upper and lower work rolls.