JP2019077004A - Belt grinding device and method for metal band - Google Patents

Abstract

To provide a belt grinding device and method for a metal band, which is useful in preventing a fire accident during grinding operation.SOLUTION: The belt grinding device has a rotary grinding belt 11 which grinds the whole surface of a metal band 1 passing a plate therethrough, an actuator 25 for reciprocating the belt that reciprocates the grinding belt in a plate width direction of the metal band and an end part detecting sensor 20 that detects an end part in the width direction of the grinding belt, which further comprises control means 30A which generates a control signal C1 to the actuator for reciprocating the belt using a sensor output signal S1 from the end part detecting sensor, detects expression of an abnormal state from ON duration time and OFF duration time of the sensor output signal, and generates an abnormality detection signal C2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a belt grinding apparatus and method for a metal band, which prevents an ignition accident due to ignition of grinding oil during an operation of grinding the surface of the metal band with a grinding belt while passing the metal band.

  Conventionally, a metal strip, for example, a stainless steel strip, is a series of refining, casting steel slab (slab), hot rolling, annealing, pickling, cold rolling, finish annealing, pickling, refining rolling, refining, etc. Manufactured by the process of By the way, a metal strip such as a stainless steel strip which is extended by rolling through many processes and has a large surface area by rolling, for example, has a quality problem to suppress the entry of wrinkles during the production.

In order to solve this problem, conventionally, the surface of the stainless steel strip is inspected on the equipment outlet side of the main process, and a portion where wrinkles have occurred is cut off, or in some cases, the surface is locally ground off. In some cases, the entire surface was ground depending on the degree of wrinkles. Furthermore, depending on the type of stainless steel, in order to ensure the surface gloss after cold rolling, it has been necessary to remove intergranular erosion holes that interfere with the gloss formed during hot-rolling steel strip pickling. In addition, in the case of a stainless steel strip having high corrosion resistance or high oxidation resistance, the scale (oxide layer) of the hot rolled steel strip can not be sufficiently removed by pickling, so that the entire surface may be ground.
Moreover, in the product for the use which made the surface of the stainless cold-rolled steel strip the designability, there also existed a thing which carries out whole surface grinding to the stainless cold-rolled steel strip.

The plate thickness of the stainless hot rolled steel strip is, for example, 1.5 to 13 mm, the plate width is, for example, 600 to 2000 mm, the plate thickness of the stainless cold rolled steel strip is, for example, 0.4 to 3 mm, and the plate width is, for example, 600 to It is 1600 mm.
As such a continuous grinding line for full surface grinding, for example, a continuous grinding line using a conventional belt grinding apparatus is known (see Patent Document 1).

  Moreover, as a continuous grinding line using the conventional belt grinding apparatus, the thing shown, for example in FIG. 3 which simplified what was disclosed by patent document 1 is also mentioned. The continuous grinding line shown in FIG. 3 is paid out from the payoff reel 100 and is diverted by the entry side deflector roll 2 (here, "redirecting" means to change the direction of threading. The same applies hereinafter) a metal strip, for example, For example, the belt grinding device 10 of a plurality of stands arranged in series, for example 4 stands (generally 3 to 7 stands), is brought into contact with the stainless steel strip 1 in contact with the plurality of pass line rolls 5 arranged in series. The sheet is passed at a sheet passing speed of about 12 m / min, deflected by the outlet-side deflector roll 3, and wound and collected by the tension reel 200.

  Each belt grinding apparatus 10 is endlessly wound between a contact roll 13 driven by a motor and an idler roll 12, for example, a grinding belt 11 of grinding abrasive grain number 60 to 180, and a metal band (for example, stainless steel It has the billy roll 14 provided in the position which opposes the contact roll 13 on both sides of the steel strip 1). The belt width of the grinding belt 11 is, for example, about the plate width of the metal band 1 + (100 to 1000) mm.

  The billy roll 14 is raised and lowered by the billy roll raising and lowering means 15. When grinding the metal band 1, the billy roll 14 is raised into the sheet of the metal band 1 to bring the metal band 1 into contact with the grinding belt 11 and maintain the contact state. Further, during grinding, grinding is performed while the grinding oil 17 composed of mineral oil is sprayed to the grinding belt 11 or further to the metal band 1 by the grinding oil injection means 16. In addition, another grinding oil injection means (not shown) may be provided opposite to the grinding oil injection means 16 with the grinding belt 11 interposed therebetween. When grinding is stopped, the billy roll 14 is lowered to separate the metal band 1 from the grinding belt 11.

  The belt grinding apparatus 10 is provided with idler roll elevating means (not shown) for moving the idler roll 12 up and down in order to adjust the tension of the grinding belt 11 wound between the contact roll 13 and the idler roll 12 ing.

In addition, the belt grinding device 10 of each stand has a cover (not shown) for covering the device for each stand in order to limit the scattering range of the fumes of the grinding oil 17 and grinding debris.
In the belt grinding apparatus 10, generally, grinding belt width direction position control is performed which is control for holding the width direction center of the grinding belt 11 in the vicinity of the width direction center position of the metal band 1 during grinding.

  As a method of controlling the position in the width direction of the grinding belt, the grinding belt 11 is reciprocated in the width direction of the metal band 1 (hereinafter referred to as "plate width direction"), and the reciprocation section is divided into two end detection sensors. Or the method of setting using one is mentioned. Note that the distance between any one end in the belt width direction moving from the time when the belt width center point is at the plate width center position to the above one side and reaching the farthest position (see FIG. And (delta) of FIG. 2 is about 20-150 mm.

  When using two said edge detection sensors, although illustration is abbreviate | omitted, one of the said two edge detection sensors is carried out to the both ends of the section (henceforth "a setting reciprocation section") of the reciprocation set above. The one end and the other end of the grinding belt 11 in the width direction are respectively detected by one and the other of the two end detection sensors, and the direction of the reciprocation is reversed at the time of detection. . However, in fact, because of the inertia of the grinding belt, the time when the movement direction of the grinding belt actually reverses is later than the time when the end detection sensor detects the width direction end of the grinding belt, so the movement direction of the grinding belt The position in the board width direction at which is inverted is outside the set reciprocation section. This point is the same even in the case of using one end detection sensor.

  When one end detection sensor is used, the belt grinding apparatus 10 is configured, for example, as shown in FIG. 4, and grinding is performed such that the timing chart of the grinding belt width direction position control is as shown in FIG. In the example of FIG. 4, an optical sensor including a light emitting unit a1 and a light receiving unit a2 is used as the end detection sensor 20. The end detection sensor 20 is disposed on the operation side (OP side) of the belt grinding device 10. In addition, you may use the wind pressure sensor (not shown) which consists of a ventilation part and a wind receiving part instead of the said optical sensor.

  Also, as a means for reciprocating the grinding belt 11 in the plate width direction, for example, the roll axis of the idler roll 12 is provided around the rotation center axis 21 provided on the drive side (DR side) from the position orthogonal to the sheet passing direction. Has an actuator 25 for reciprocating the belt, which causes the grinding belt 11 to generate a moving speed component in the plate width direction by tilting it in the + direction or − direction shown in the figure (two end detection sensors The same applies in the case of use).

  In FIG. 4, both the inclination direction of the roll axis of the idler roll 12 and the movement direction of the grinding belt 11 corresponding to each other are the same sign (both + or both-), and when the inclination direction is + direction The direction is the + direction (direction to the DR side), and when the inclination direction is the-direction, the movement direction is also the-direction (direction to the OP side).

  The belt grinding device 10 receives the sensor output signal S1 of the end detection sensor 20 and generates a control signal C1 for controlling the operation of the actuator 25 for reciprocating the belt in order to automatically perform the grinding belt width direction position control. Control means 30 for FIG. 5 shows the sensor output signal S1, the control signal C1 and the grinding belt when the end detection sensor is installed at a position where the end detection sensor detects the grinding belt end immediately before the grinding belt has moved most to the OP side. 12 is a timing chart showing the transition of the plate width direction position of the width direction center point of 11;

  As shown in FIG. 5, the sensor output signal S1 is ground between ON at a state where the grinding belt 11 is not present between the light emitting unit a1 and the light receiving unit a2, and between the light emitting unit a1 and the light receiving unit a2. It is a binary value with OFF of the state in which the belt 11 exists (FIG. 5 (a)). That is, when the sensor output signal S1 is ON, the grinding belt 11 is not detecting the end, and when the sensor output signal S1 is OFF, the grinding belt 11 is detecting the end.

  The control signal C1 is a binary value of DR (+) generated at the OFF reception time and OP (−) generated at TA seconds after the ON reception time (FIG. 5 (b)). The value of TA in TA seconds is determined, for example, as follows. That is, the position of the end detection sensor 20 with respect to the sheet width center line (referred to as “sensor position”) from the start time of the ON signal generation by the preliminary measurement experiment of reciprocating the grinding belt 11 using the belt reciprocating actuator 25. The time (seconds) until the DR-side end of the grinding belt 11 reaches the symmetrical position (referred to as “sensor conjugate position”) is measured, and the measured value is taken as the value of TA.

  The belt reciprocating actuator 25 operates to move the grinding belt 11 to the OP (-) side at the time of OP (-) reception and to the DR (+) side at the time of DR (+) reception. Therefore, the grinding belt 11 reciprocates within a section having the sensor position and the sensor conjugate position at both ends. That is, with δ = (section width of reciprocating movement−grinding belt width) / 2, the width direction center point of the grinding belt 11 is held within the range of the plate width direction center point ± δ (FIG. 5 (c)) .

JP 2001-239446 A

  By the way, in the conventional belt grinding apparatus, there is a danger that fumes of grinding oil may be ignited by abnormal heat generation locally during grinding work, leading to an ignition accident. Therefore, for each stand, in the cover covering the apparatus. It is equipped with fire extinguishing equipment to blow in extinguishing agents such as carbon dioxide. Therefore, although there is a system that can extinguish the fire immediately even if a fire accident occurs, once the fire accident occurs, the grinding line is stopped, the inside of the cover is cleaned, and the grinding is restarted from the beginning of the metal band again. The need to reduce productivity significantly. Furthermore, since parts such as end detection sensors may fail due to the influence of heat due to a fire accident, it is necessary to carry out equipment inspection before restarting the machine, and if there is a failure, parts replacement must also be carried out. .

  Then, in view of the above-mentioned circumstances, an object of the present invention is to provide a belt grinding device and method that are useful for preventing a firing accident during a grinding operation.

  The present inventors diligently studied to solve the above-mentioned problems, and obtained the following findings. That is, as a cause of the local abnormal heat generation leading to the ignition accident during the grinding operation, (a) from a predetermined reciprocating movement section of the grinding belt due to a sudden failure of the end detection sensor or the belt reciprocating actuator. As a result of the defect in the control of movement in the width direction of the grinding belt, the phenomenon that the end in the width direction of the grinding belt contacts peripheral equipment, (a) the end in the width direction of the grinding belt (or the end in the width direction) (Inward tears), there is a phenomenon in which the contact pressure increases at the local area as a result of the local thickening. In an abnormal state in which these phenomena (a) and (b) appear, one or both of the ON-duration and OFF-duration of the end detection sensor are significantly longer than in a normal state. Become.

  Therefore, it is possible to detect the occurrence of an abnormal condition by using the ON duration and the OFF duration of the end detection sensor. And, by stopping the grinding operation at the time of detection of the occurrence of the abnormal state, it is possible to prevent the ignition accident in advance.

The present invention has been made based on the above findings.
That is, the present invention is as follows.
(1) A rotating grinding belt for grinding the entire surface of a metal band in a plate, an actuator for reciprocating the belt for reciprocating the grinding belt in the width direction of the metal band, and a width direction end of the grinding belt A belt grinding device having an end detection sensor for detecting
The control signal to the actuator for reciprocating the belt is generated using the sensor output signal of the end detection sensor, and the occurrence of an abnormal state is detected from the ON duration time and the OFF duration time of the sensor output signal. A belt grinding apparatus characterized by comprising control means for generating a detection signal.
(2) The belt grinding device according to (1), wherein the generated abnormality detection signal is used as a signal for prompting the user to stop the grinding operation.
(3) The grinding belt is reciprocated in the plate width direction of the metal band during grinding operation where the entire surface is ground with the rotating grinding belt while passing the metal band, and the direction of the reciprocation is set to In a belt grinding method of a metal belt, switching is performed using a sensor output signal of an end detection sensor that detects a width direction end,
A method of belt grinding of a metal band, comprising detecting an occurrence of an abnormal state using an ON duration and an OFF duration of the sensor output signal.
(4) In the method (3), the grinding operation is stopped when the occurrence of the abnormal state is detected.
(5) The belt grinding method according to (3) or (4), wherein the metal band is a stainless steel band.

  ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to prevent the ignition accident by local abnormal heat generation in the grinding operation | work by a grinding belt in advance.

It is a schematic diagram which shows an example of the belt grinding apparatus of this invention. It is a timing chart which shows an example of the belt grinding method of the present invention. It is a schematic diagram which shows an example of the continuous grinding line which used the conventional belt grinding apparatus. It is a schematic diagram which shows an example of the conventional belt grinding apparatus. It is a timing chart which shows an example of the conventional belt grinding method.

  As an embodiment of the present invention, belt grinding device 10A of a form shown, for example in Drawing 1 is mentioned. The belt grinding device 10A grinds the entire surface of the metal band 1 in the sheet passing, and rotates the grinding belt 11, and an actuator 25 for reciprocating the belt which reciprocates the grinding belt 11 in the width direction of the metal band 1; This point is common to the prior art (FIG. 4) in that it has an end detection sensor 20 for detecting the width direction end of the grinding belt 11. In FIG. 1, members denoted by the same reference numerals as in FIG. 4 function in the same manner as in the prior art.

  However, unlike the prior art (FIG. 4), the apparatus of FIG. 1 uses the sensor output signal S1 of the end detection sensor 20 to generate a control signal C1 to the belt reciprocating actuator 25 and the control signal C1. The controller 30A is provided with a control unit 30A that detects the occurrence of an abnormal state from the ON duration time and the OFF duration time of the sensor output signal S1, and generates an abnormality detection signal C2. On the other hand, the control means 30 of the related art (FIG. 4) generates the control signal C1 to the actuator for reciprocating the belt using the sensor output signal S1 of the end detection sensor 20, but the sensor output signal The occurrence of an abnormal state is detected from the ON duration time and the OFF duration time of S1, and no abnormal detection signal C2 is generated.

  In the present invention, the abnormality detection signal C2 is a signal for prompting the grinding to stop, for example, a signal for prompting the lowering of the billy roll lifting means 15 as shown in FIG. As soon as the billy roll lifting means 15 receives a signal (abnormality detection signal C2) prompting the lowering, the billy roll 14 is lowered to separate the grinding belt 11 from the metal band 1 and the grinding operation is stopped. The abnormality detection signal C2 may be a signal prompting the lowering of the idler roll lifting means (not shown). Also in this case, as soon as the idler roll lifting means (not shown) receives the abnormality detection signal C2, the idler roll 12 is lowered immediately, and the speed of the grinding belt 11 is not synchronized with the speed of the contact roll 13 driven by the motor. , Grinding work is stopped.

A method of detecting the occurrence of an abnormal state from the ON duration time and the OFF duration time of the sensor output signal S1 and generating the abnormality detection signal C2 will be described using the timing chart of FIG. The control means 30A sequentially derives the ON duration time T _ON and the OFF duration time T _OFF from the sensor output signal S1 of FIG. 2A, and the sequentially derived T _ON exceeds the preset threshold value T _ON C. When (T _ON > T _ON C) or when the sequentially derived T _OFF exceeds a preset threshold T _OFF C (T _OFF > T _OFF C), the abnormality detection signal C2 Generate The threshold T _ON C and the threshold T _OFF C may be determined from the range of T _ON and T _OFF expected to lead to a fire accident.

  As the metal strip 1, for example, a stainless steel strip, in particular, for example, a ferritic stainless steel strip may be mentioned. Conventionally, the frequency of occurrence of firing accidents during grinding operations is relatively high, and from the viewpoint of the manifestation of the effects of the present invention, they are suitable as a material to be ground.

In the belt grinding method of the present invention, for example, using the continuous grinding line as the belt grinding apparatus 10A of FIG. 1 in place of the belt grinding apparatus 10 of FIG. The sensor of the end detection sensor 20 which reciprocates the grinding belt 11 in the plate width direction of the metal band 1 during the grinding operation and detects the width direction end of the grinding belt 11 during the grinding operation of grinding. In the belt grinding method of a metal belt which is switched using the output signal S1, the occurrence of an abnormal state is detected in the same manner as in FIG. 2 using the ON duration T _ON and the OFF duration T _OFF of the sensor output signal S1. Then, preferably, the grinding operation is stopped when the occurrence of the abnormal state is detected. Thereby, the occurrence of the ignition accident can be prevented in advance.

The belt grinding method of the present invention can also be carried out using the conventional belt grinding apparatus 10. However, in that case, an abnormal signal generation means (not shown) which is a means for detecting the occurrence of an abnormal state from the ON duration time T _ON and the OFF duration time T _{OFF of the} sensor output signal S1 and generating an abnormality detection signal C2. Needs to be provided separately from the control means 30.

  Further, in the present invention, the stopping of the grinding operation by the detection of the abnormal state can be carried out for each belt grinding device of each stand of the continuous grinding line.

In the above embodiment, the case where one end detection sensor 20 is used is described as an example, but in the present invention, two end detection sensors 20 are used, one on the OP side and one on the DR side. Even in the case, by stopping the grinding operation when T _ON > T _ON C or T _OFF > T _OFF C for each end detection sensor, the same effect can be obtained.

  A ferritic stainless hot-rolled steel strip with a thickness of 1.5 to 13 mm and a width of 700 to 1600 mm is passed through the continuous grinding line of FIG. 3 for about 20,000 to 30,000 tons a year, as shown in FIG. In the conventional embodiment, δ in FIG. 5 is 50 mm in the prior art, and in the prior art, a firing accident during the grinding operation caused by the deterioration of the grinding belt and the defect in the movement control of the grinding belt width direction is performed. It occurred a few times a year.

Therefore, according to the present invention, a continuous grinding line is used in which the belt grinding apparatus 10A (FIG. 4) is replaced with the belt grinding apparatus 10A (FIG. 1) in FIG. 3, and the embodiment of the present invention shown in FIGS. In FIG. 2, δ was set to 50 mm as in the prior art, the threshold T _OFF C was set to 2 seconds, and the threshold T _ON C was set to 5 seconds, respectively, and the grinding operation was performed. As a result, the grinding operation was stopped when T _ON > T _ON C or T _OFF > T _OFF C, but ignition occurred during grinding due to deterioration of the grinding belt or a defect in movement control of the grinding belt width direction. There were no accidents.

1 Metal strip (stainless steel strip)
2 Entry side deflector roll 3 Exit side deflector roll 5 Pass line roll 10 Belt grinding device (conventional)
10A Belt Grinding Device (Invention)
DESCRIPTION OF SYMBOLS 11 Grinding belt 12 Idler roll 13 Contact roll 14 Billy roll 15 Billy roll elevating means 16 Grinding oil injection means 17 Grinding oil 20 End part detection sensor 21 Rotation central axis 25 Actuator for belt reciprocating movement 30 Control means (conventional)
30A control means (invention)
100 Payoff Reels 200 Tension Reels a1 Light emitters a2 Light receivers

Claims (5)

A rotating grinding belt for grinding the entire surface of a metal strip in a sheet through, an actuator for reciprocating the belt for reciprocating the grinding belt in the width direction of the metal band, and a width direction end of the grinding belt In a belt grinding device having an end detection sensor,
The control signal to the actuator for reciprocating the belt is generated using the sensor output signal of the end detection sensor, and the occurrence of an abnormal state is detected from the ON duration time and the OFF duration time of the sensor output signal. A belt grinding apparatus characterized by comprising control means for generating a detection signal.   The belt grinding apparatus according to claim 1, wherein the generated abnormality detection signal is a signal for prompting stopping of the grinding operation. The grinding belt is reciprocated in the plate width direction of the metal band during grinding operation in which the metal belt is passed while the entire surface is ground with the rotating grinding belt, and the direction of the reciprocation is the width direction end of the grinding belt In a belt grinding method of a metal belt, switching is performed using a sensor output signal of an end detection sensor that detects a part
A method of belt grinding of a metal band, comprising detecting an occurrence of an abnormal state using an ON duration and an OFF duration of the sensor output signal.   The method according to claim 3, wherein the grinding operation is stopped when the occurrence of the abnormal state is detected.   5. The method according to claim 3, wherein the metal band is a stainless steel band.

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