Steel strip brush grinding method

Abstract

To provide a method for executing appropriate draft grinding with consideration given to a brush wear amount without detecting a brush position for a brush draft timing in a steel strip continuous process line.SOLUTION: This steel strip brush grinding method for grinding the surface of a steep strip through a plurality of steps using a brush roll which vertically moves, for n-th brush grinding, estimates a brush roll wear amount δn on the basis of a last (n-1 th) grinding result, adds the amount δn to the moving distance of the brush roll, and adjusts n-th lapse time until the tip of the brush roll comes into contact with the surface of the steel strip to be equal to the last (n-1 th) lapse time.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a brush grinding method for steel strips, and more particularly to a brush grinding method for adjusting the delay in pressing down of a brush roll due to wear of a brush when removing scales using a brush roll equipped with a grinding brush (hereinafter also simply referred to as "brush"). [Background technology]

[0002] General stainless steel strips are manufactured by pickling hot-rolled steel sheets, followed by cold rolling, annealing, and temper rolling. During the above processes, oxide scale is formed on the surface of the steel sheets after hot rolling and continuous annealing. The method of descaling steel sheets with oxide scale formed on the surface is generally to pass them through an acid pickling facility, and additionally to perform shot blasting, surface grinding, etc. In particular, various surface grinding methods using a brush have been investigated to improve surface quality by performing uniform grinding using a grinding brush, etc.

[0003] For example, a method is known in which the rolling force is changed according to the amount of brush wear in order to keep the cleaning power constant even when the brush is worn. Patent Document 1 discloses a method for controlling the rolling force of a brush roll for cleaning a steel strip surface, in which the length of the brush roll is measured and a relationship between the brush roll running length and the amount of brush wear that is determined in advance. Specifically, the method describes a rolling force control method in which the roll rotation load current is set based on a relationship between the amount of brush wear that is determined in advance and the load current of the roll rotation motor.

[0004] Furthermore, Patent Document 2 discloses a method for detecting the current of a rotating motor when no load is applied and storing the detected current when no load is applied so that a constant grinding amount is maintained even when wear progresses in a brush roll device. The method describes a method for controlling the roll reduction so that the current of the rotating motor becomes the target current, which is set to the sum of the stored current when no load is applied and a predetermined set current. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 4-178212 [Patent Document 2] Japanese Patent Application Publication No. 2-124261 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the cases of Patent Documents 1 and 2, although it is possible to keep the grinding amount constant, in a high-speed line in which various steel strips are continuously passed through, there was a problem that if the brush wear progresses, the timing of the brush contact is delayed and the tip of the steel strip cannot be brushed.

[0007] Usually, in a continuous steel strip processing line, a punch hole is made near the coil connection, and the punch hole is optically detected by a punch hole detector (WPD) installed in front of the brush stand to track the steel strip. When switching from a steel strip that does not require a brush to a steel strip that does require a brush, it is common to detect the punch hole in front of the brush stand, calculate the position of the coil tip from the line speed and the distance between the WPD and the brush stand, and start pressing down with the brush. Here, a steel strip that requires a brush is also called "brush material" and a steel strip that does not require a brush is also called "no-brush material."

[0008] Figure 2 shows the positional relationship between the steel strip and the brush roll (top and bottom), and Figure 1 shows the overall configuration (covering four patterns) of the brush grinding method according to the present invention described below. The solid and dotted lines in Figure 1 represent the change in the distance between the tip of the brush on the steel strip side (hereinafter also simply referred to as the "brush tip") and the steel strip. The solid line portion represents the change in the basic process, which is the first pattern of the present invention, and the dotted line portion represents the change in the second and third patterns.

[0009] Here, the relationship between the change in the positional relationship of the brushes and the wear of the brushes will be described with reference to FIG. 5, which shows a basic process of the brush grinding method (a first pattern according to the present invention, which will be described later), as an example.

[0010] In FIG. 5, the process in which the brush is kept waiting with its tip at a position a distance L (mm) from the center of the thickness of the steel strip is the "brush waiting process [W]". Next, the process in which the brush moves until the tip of the brush comes into contact with the steel strip surface in order to grind with the brush is the "brush moving process [M]". After the tip of the brush comes into contact with the steel strip, the process in which the brush grinds with the steel strip is the "grinding process [B]". The time during the brush waiting process is the brush waiting time T W (seconds), and the time during the brush movement process is the brush movement time T M (sec). The brush movement speed V M In normal cases, it is preferable that the brush speed (mm / sec) is low (0.3 mm / sec to 1.0 mm / sec). After the brush is moved and comes into contact with the steel strip, the brush continues to press down on the steel strip at the same brush movement speed until the load current value of the brush rotation drive device reaches a certain value, so it is preferable that the brush pressing speed in the brush grinding process is also low. If the brush pressing speed is high, the steel strip may meander or the load on the brush roll may become excessive when the steel strip comes into contact with the brush.

[0011] In addition, the period from the above-mentioned brush waiting process [W] through the brush moving process [M] to executing and finishing the grinding process [B] and returning the brush to the waiting position L is counted as one cycle in the entire brush grinding process. The timing of the end is the timing of detecting the punched holes, similar to the timing of the start of pressing described above.

[0012] In the actual line, the brush material and the no-brush material are mixed and passed through, and the brush is pressed down when the brush material is passed through, and the brush is opened without being pressed down when the no-brush material is passed through. Therefore, the "number of times of brush grinding" in the present invention is not the number of brush materials (number of coils) that have been subjected to brush grinding, but the number of times that the brush has been shifted from an open state to a pressed down state. In other words, the number of times of brush grinding in the present invention is the same as the number of times that the no-brush material is switched to the brush material, and when the brush material is successive, the number of times of brush grinding does not increase but remains the same. In the actual line, brush grinding is performed multiple times, and if the number of times is n, the previous grinding result is n-1 times. The solid line in FIG. 5 represents the transition of the movement of the brush tip in this previous (n-1 times) grinding result (hereinafter also simply referred to as "previous result").

[0013] The brush is further worn by compressing the brush and grinding the steel strip surface (nth time). If the amount of wear is δ (mm) as shown in Figure 2, the tip of the brush in the brush grinding process performed in a worn state will follow the transition shown by the dotted line in Figure 5. This transition is the case when the compression delay adjustment method of the present invention described later is not performed.

[0014] In other words, the brush standby position in the brush standby process is not at a position at a distance L from the center of the steel strip thickness, but at a position that is "L + δ" that includes the amount of wear δ. Compared to the previous (n-1) results, a shift (delay) occurs in the timing of pressing down, and T D The reduction is delayed by the reduction delay time. Due to the delay in the reduction timing, some steel strips are transported without being reduced, and the oxide scale on the surface of these steel strips is not removed, resulting in a loss of the strips as they are cut off.

[0015] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a method for pressing down and grinding a brush at an appropriate timing in a continuous steel strip processing line, taking into account the amount of wear of the brush without detecting the brush position. [Means for solving the problem]

[0016] In order to achieve the above object, the inventors have investigated a method for making the timing of contact between the brush and the steel strip constant even when the brush is worn, that is, a method for avoiding the difference in the grinding start time due to a roll-down delay, and have found the following method for avoiding the roll-down delay.

[0017] First, the wear amount of the brush in the nth grinding run δ n is estimated based on the previous (n-1) time performance, where n is a natural number with a minimum value of 2 and a maximum value of 200.

[0018] This estimated wear amount δ n is added to the distance the brush roll moves up and down. Based on this corrected distance value, the elapsed time until the brush comes into contact with the steel strip (the total process time of the brush grinding method) is adjusted so that it is the same as the previous elapsed time.

[0019] Furthermore, two types of adjustment methods were found: one that changes the timing of the movement without changing the movement speed, and one that changes the movement speed itself. If the number of times grinding is performed is the nth time, counting from the first time with a new brush, the previous performance is the n-1th performance.

[0020] The present invention was completed based on these findings and through further investigation, and the gist of the present invention is as follows. [1] A method for brush grinding a steel strip, which uses a brush roll that moves in an up-down direction to grind the surface of the steel strip through multiple steps, When performing the nth brush grinding, The wear amount δ of the brush roll n is estimated based on the previous (n-1) grinding results, The travel distance of the brush roll is multiplied by the wear amount δ n Add up The time that elapses until the tip of the brush roll contacts the surface of the steel strip for the nth time is adjusted to be the same as the time that elapsed for the previous time (n-1th time). 2. A method for brush grinding of steel strips comprising the steps of: Here, n is a natural number with a minimum value of 2 and a maximum value of 200. [2] In the above [1], the above steps include: a brush standby process [W] in which the tip of the brush roll waits at a position spaced a distance L from the center of the thickness of the steel strip; a brush moving step [M] in which the tip of the brush roll moves until it contacts the surface of the steel strip; A grinding process [B] in which the tip of the brush roll contacts the surface of the steel strip and then presses down to grind the strip; A method for brush grinding a steel strip, comprising the steps of: [3] In the method according to [2], the steps include: A pre-preparation process [P] is provided before the brush standby process [W], The advance preparation step [P] includes: A preliminary waiting step [P W 〕and, A pre-movement step [P M 〕and, A method for brush grinding a steel strip, comprising the steps of: [4] In the above [2], the brush moving step [M] is First step [M 1 ] and the second step [M 2 ] and The second step [M 2 〕 movement speed V M2 is the first step [M 1 〕 movement speed V M1 Less than 2. A method for brush grinding of steel strips comprising the steps of: [5] In the above [3], the brush moving step [M] is First step [M1 ] and the second step [M 2 ] and The second step [M 2 〕 movement speed V M2 is the first step [M 1 〕 movement speed V M1 Less than 2. A method for brush grinding of steel strips comprising the steps of: [6] In the above [2], the adjustment is The brush movement process [M] has a movement time T M The wear amount δ and the moving speed V of the brush moving process [M] M The time T was calculated using the following formula (1) A Should I make it longer than the previous performance? Alternatively, the moving speed of the brush moving step [M] is adjusted to a moving speed V obtained by the following formula (2). M' By so doing, the movement time T M is set to the same as the previous performance 2. A method for brush grinding of steel strips comprising the steps of: T A = δ n / V M ... (1) V M ′=(L+δ n ) / T M (2) Here, L is the distance between the tip of the brush roll and the center of the thickness of the steel strip in the brush standby process [W].

[0021] [7] In the above [3], the adjustment is The pre-movement step [P M ] travel time T P and the movement time T of the brush movement process [M] M is the total travel time, T P +T M The wear amount δ n A part of δ n1 and the pre-movement step [P M 〕 movement speed V P The first time T is calculated from the following formula (3):A1 and the wear amount δ n The remainder δ n2 and the moving speed V of the brush moving process [M] M The second time T is calculated from the following formula (4): A2 The time T A Should I make it longer than the previous performance? Or, the pre-movement step [P W 〕 is adjusted to the moving speed V P' By doing so, the pre-movement step [P W ] travel time T P Will it be the same as the previous performance? Alternatively, the moving speed of the brush moving step [M] is adjusted to a moving speed V obtained by the following formula (2). M' By so doing, the movement time T M is set to the same as the previous performance 2. A method for brush grinding of steel strips comprising the steps of: T A1 = δ n1 / V P ... (3) T A2 = δ n2 / V M (4) T A =T A1 +T A2 ... (5) Here, δ n1 and δ n2 The relationship is expressed by the following equation (6). kδ n1 +(1-k)δ n2 = δ n ... (6) where k is δ n1 δ n is the coefficient of the allocation ratio, where k=0 to 1. V P ′=(K-L+δ n ) / T P ... (7) V M ′=(L+δ n ) / T M (2) Here, K is the number of steps in the pre-waiting step [P W 〕 is the distance between the tip of the brush roll and the center of the thickness of the steel strip, and L is the distance between the tip of the brush roll and the center of the thickness of the steel strip in the brush waiting process [W]. [8] In the above [4], the adjustment is The first step of the brush moving process [M 1 ] travel time T M1 and the second step of the brush moving process [M 2 ] travel time T M2 is the total travel time, T M1 +T M2 The wear amount δ n A part of δ n1 and the first step [M 1 〕 movement speed V M1 The first time T is calculated from the following formula (8): A1 and the wear amount δ n The remainder δ n2 and the second step [M 2 〕 movement speed V M2 The second time T is calculated from the following formula (9): A2 The time T A Should I make it longer than the previous performance? Or, the first step of the brush moving process [M 1 〕 is adjusted to the adjusted moving speed V M1 ', the first step of the brush moving process [M 1 ] travel time T M1 Will it be the same as the previous performance? Or, the second step of the brush moving process [M 2 〕 is adjusted to the adjusted moving speed V M2 ', the second step of the brush moving process [M 2 ] travel time T M2 is set to the same as the previous performance A method for brush grinding of steel strips, comprising: T A1 = δ n1 / VM1 ... (8) T A2 = δ n2 / V M2 ... (9) T A =T A1 +T A2 ... (10) Here, δ n1 and δ n2 The relationship is expressed by the following equation (11). kδ n1 +(1-k)δ n2 = δ n ... (11) where k is δ 1 is the coefficient of the allocation ratio for δ, where k=0 to 1. V M1 ′=(L-C+δ n ) / T M1 ... (12) V M2 ′=(C+δ n ) / T M2 (13) Here, L is the distance that the tip of the brush roll is separated from the center of the thickness of the steel strip in the brush waiting step [W], and C is the distance that the tip of the brush roll is separated from the center of the thickness of the steel strip in the first step of the brush moving step [M 1 ] to the second step of the brush moving process [M 2 ] is the distance by which the tip of the brush roll is spaced from the center of the thickness of the steel strip.

[0022] [9] In the above [5], the adjustment is The pre-movement step [P M ] travel time T P , the first step of the brush moving process [M 1 ] travel time T M1 and the second step of the brush moving process [M 2 ] travel time T M2 is the total travel time, T P +T M1 +T M2 The wear amount δ n A part of δ n1 and the pre-movement step [PM 〕 movement speed V P The first time T is calculated from the following formula (14): A1 , the wear amount δ n Other part of δ n2 and the first step [M 1 〕 movement speed V M1 The second time T is calculated from the following formula (15): A2 and the wear amount δ n The remainder δ n3 and the second step [M 2 〕 movement speed V M2 The third time T is calculated by the following formula (16) A3 The time T A Should I make it longer than the previous performance? Or, the pre-movement step [P W 〕 is adjusted to the moving speed V P' By doing so, the pre-movement step [P W ] travel time T P Will it be the same as the previous performance? Or, the first step of the brush moving process [M 1 〕 is adjusted to the adjusted moving speed V M1 ', the first step of the brush moving process [M 1 ] travel time T M1 Will it be the same as the previous performance? Or, the second step of the brush moving process [M 2 〕 is adjusted to the adjusted moving speed V M2 ', the second step of the brush moving process [M 2 ] travel time T M2 is set to the same as the previous performance 2. A method for brush grinding of steel strips comprising the steps of: T A1 = δ n1 / V P (14) T A2 = δ n2 / V M1 (15) TA3 = δ n3 / V M2 ... (16) T A =T A1 +T A2 +T A3 (17) Here, δ n1 , δ n2 and δ n3 The relationship is expressed by the following equation (18). k 1 δ n1 +k 2 δ n2 +(1-k 1 -k 2 ) δ n3 = δ n ... (18) Where k 1 and k 2 is δ n1 and δ n2 δ n The coefficient of the allocation ratio for k 1 = 0 to 1, k 2 = 0 to 1, k 1 +k 2 =0~1. V P ′=(K-L+δ n ) / T P ... (7) V M1 ′=(L-C+δ n ) / T M1 ... (12) V M2 ′=(C+δ n ) / T M2 (13) Here, K is the number of steps in the pre-waiting step [P W ], L is the distance by which the tip of the brush roll is separated from the center of the thickness of the steel strip in the brush waiting step [W], and C is the distance by which the tip of the brush roll is separated from the center of the thickness of the steel strip in the first brush moving step [M 1 ] to the second step of the brush moving process [M 2 ] is the distance by which the tip of the brush roll is spaced from the center of the thickness of the steel strip. Effect of the Invention

[0023] According to the present invention, in a continuous production line, the brush wear amount during brush grinding (nth time) can be estimated in advance from the previous (n-1th) time, which is an exceptional industrial effect that prevents a delay in brush pressing down without reducing productivity. In addition, there is an excellent effect that the brush position can be easily controlled by only changing the movement time or movement speed without detecting the brush position. [Brief description of the drawings]

[0024] [Figure 1] FIG. 11 is a schematic diagram showing an overall configuration (fourth pattern) of a brush grinding process according to the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing the positional relationship between a steel strip and a brush roll. [Diagram 3] FIG. 4 is a schematic diagram showing the relationship between the distance of use and the amount of wear in the brush rotation direction. [Figure 4] FIG. 13 is a schematic diagram showing the relationship between the distance of use and the amount of wear at a brush load current. [Diagram 5] FIG. 11 is a diagram showing the transition of the brush position in the first pattern (basic) according to the present invention. [Figure 6] FIG. 1 is a schematic diagram showing a first pattern adjusting method 1-1 according to the present invention. [Figure 7] FIG. 1 is a schematic diagram showing a first pattern adjusting method 1-1′ according to the present invention. [Figure 8] FIG. 13 is a diagram showing the transition of the brush position in the second pattern (addition of a preliminary process) according to the present invention. [Figure 9] FIG. 2 is a schematic diagram showing a second pattern adjustment method 2-1 according to the present invention. [Figure 10] FIG. 11 is a schematic diagram showing a second pattern adjustment method 2-2 according to the present invention. [Figure 11] FIG. 11 is a schematic diagram showing a second pattern adjustment method 2-3 according to the present invention. [Figure 12] FIG. 2 is a schematic diagram showing a second pattern adjusting method 2-1′ according to the present invention. [Figure 13] FIG. 2 is a schematic diagram showing a second pattern adjusting method 2-2' according to the present invention. [Figure 14] FIG. 11 is a diagram showing transition of the brush position in the third pattern (division of movement step) according to the present invention. [Figure 15] FIG. 13 is a schematic diagram showing a third pattern adjustment method 3-1 according to the present invention. [Figure 16] FIG. 13 is a schematic diagram showing a third pattern adjustment method 3-2 according to the present invention. [Figure 17] FIG. 11 is a schematic diagram showing a third pattern adjustment method 3-3 according to the present invention. [Figure 18] FIG. 13 is a schematic diagram showing a third pattern adjustment method 3-1′ according to the present invention. [Figure 19] FIG. 13 is a schematic diagram showing a third pattern adjustment method 3-2' according to the present invention. [Figure 20] FIG. 13 is a diagram showing transition of the brush position in the fourth pattern (all process settings) according to the present invention. [Figure 21] FIG. 13 is a schematic diagram showing a fourth pattern adjustment method 4-1 according to the present invention. [Figure 22] FIG. 13 is a schematic diagram showing a fourth pattern adjustment method 4-2 according to the present invention. [Diagram 23] FIG. 11 is a schematic diagram showing a fourth pattern adjustment method 4-3 according to the present invention. [Figure 24] FIG. 4 is a schematic diagram showing a fourth pattern adjustment method 4-4 according to the present invention. [Diagram 25] FIG. 13 is a schematic diagram showing a fourth pattern adjustment method 4-1′ according to the present invention. [Figure 26] FIG. 13 is a schematic diagram showing a fourth pattern adjustment method 4-2' according to the present invention. [Figure 27] FIG. 4 is a schematic diagram showing a fourth pattern adjustment method 4-3' according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] An embodiment of the present invention is described below.

[0026] [Adjustment method to avoid delay in pressing due to brush wear] The brush grinding method according to the present invention is a brush grinding method for a steel strip, which uses a brush roll that moves in the vertical direction to grind the surface of the steel strip through a plurality of processes. The characteristic of the method is that the wear amount δ of the brush when grinding is performed (nth time) is n is estimated based on the grinding results of the previous time (n-1th time), and the wear amount δ n Based on the corrected distance value, the elapsed time until the brush comes into contact with the steel strip (the total process time of the brush grinding method) is adjusted to be the same as the previous elapsed time.

[0027] [Wear volume δ n and its estimation method] Wear amount δ n This can be measured manually when the brush is not in use, but if it is not possible to measure on a continuous high-speed line, it can be estimated as follows.

[0028] First, the wear amount δ n can be obtained based on data previously obtained from the relationship with the brush use distance as shown in Figure 3 or Figure 4. Figure 3 shows the correlation between the brush rotation direction (forward and reverse rotation) relative to the steel strip running direction and the brush use distance, and Figure 4 shows the correlation between the brush load current value and the brush use distance. A relational equation is obtained by approximating each of Figures 3 and 4 with a linear function. By using the approximate equation thus created, the wear amount δ at the nth grinding pass can be calculated from each brush use condition using equation (19). n can be estimated.

[0029]

number

[0030] The brush conditions are conditions exemplified by the brush rotation direction or brush load current value relative to the brush use distance x, which is the transport distance of the steel strip during the elapsed time that the brush and the steel strip are in contact with each other.

[0031] As shown in Fig. 3, the brush wear amount δ increases with increasing brush use distance in both cases, i.e., forward rotation (where the brush rotates in the same direction as the steel strip travel direction) and reverse rotation (where the brush rotates in the opposite direction to the steel strip travel direction). n In addition, as shown in Fig. 4, the higher the brush load current value, the greater the wear.

[0032] [Adjustment of pressure reduction delay time] Delay time T D (seconds) is the estimated wear amount δ n The speed at which the brush moves over a distance equivalent to (mm) V M The time elapsed in (mm / sec), i.e., T D = δ n / V M Therefore, the rolling delay time T D By adjusting the time elapsed until the tip of the brush comes into contact with the steel strip surface in any step of the brush grinding method so that it is the same as the previous elapsed time, delays in rolling can be avoided.

[0033] As described above, the inventor has found two methods for this adjustment: a method for adjusting by changing the timing of movement without changing the movement speed, and a method for adjusting by changing the movement speed itself.

[0034] [Brush grinding process pattern] The adjustment method for each process pattern of the brush grinding method according to the present invention will be described in detail below.

[0035] First, the process patterns will be described. The brush grinding method according to the present invention is composed of the processes described below, and has four process patterns due to differences in the configurations.

[0036] [First pattern] The first pattern is shown in Figure 5. The steps in the first pattern are, in the order of the arrows, "brush standby step [W]" → "brush movement step [M]" → "grinding step [B]."

[0037] The brush standby process [W] is a process in which the brush waits in a standby state at a position just before the tip of the brush comes into contact with the steel strip. Here, Fig. 2 described above shows a brush grinding device equipped with brush rolls 2 above and below the steel strip 1, and in the present invention, the thickness d (mm) of the steel strip 1 is preferably 0.3 mm to 4.0 mm.

[0038] The distance L (mm) between the brush roll waiting position L (the position of the brush tip) and the center of the thickness of the steel strip 1 is usually 5 mm to 15 mm. n (mm) is the distance from the center of the steel strip thickness to the brush standby position for the n-1th time, L (mm), and the nth time is [L+δ n 〕(mm).

[0039] The time during this brush standby process is the brush standby time T W As mentioned above, in a continuous steel strip processing line, a punch hole is made near the coil connection, and the punch hole is optically detected by a punch hole detector (WPD) installed in front of the brush stand to track the steel strip. When switching from no-brush material to brush material, after the punch hole is detected in the front of the brush stand, the position of the coil tip is calculated from the line speed and the distance between the WPD and the brush stand, and the brush pressing down begins. The timing at which this punch hole is detected is called the brush waiting time T W The start time is T W Adjust.

[0040] The subsequent brush moving process [M] is a process in which the brush moves from the position where it was waiting in the brush waiting process [W] until the tip of the brush comes into contact with the steel strip. The moving speed in this process is the brush moving speed VM (mm / sec), and the time required for the brush to move is the brush movement time T M (seconds). The specific movement speed V M The brush moving speed is preferably 3.0 mm / sec to 10.0 mm / sec. M will be 5 to 10 seconds.

[0041] The last step is the grinding process [B], in which the brush tip comes into contact with the steel strip surface, and then the brush is pressed down to grind away the oxide scale on the surface, improving the descaling properties in the subsequent pickling process. In this case, if the line speed is about 50 m / min to 400 m / min, the surface oxide scale can be ground away uniformly.

[0042] In this first pattern, the brush wear is δ n The change in the distance between the brush tip and the steel strip in this case is shown by the dotted line in Figure 5. As mentioned above, the amount of wear increases by δ n (mm), the distance from the brush standby position to the brush contact is [L+δ n 〕(mm). In other words, the amount of wear δ n Since the moving distance increases by the distance of , the nth contact with the brush is delayed compared to the n-1th contact. This press-down delay time T D (sec) is the brush movement speed V M (mm / sec), [T D = δ n / V M ] can be calculated.

[0043] [Second pattern] The second pattern is shown in FIG. 8. This second pattern includes a pre-preparation step [P] before the first pattern. This pre-preparation step [P] includes a pre-wait step [P W ] and pre-movement step〔P M 〕 is divided into two steps.

[0044] That is, the process is arranged in the order of the arrows as "pre-waiting steps (PW 〕" → "Pre-move step〔P M 〕 → “Brush waiting process [W]” → “Brush moving process [M]” → “Grinding process (B)”.

[0045] Pre-wait step [P W ] is a step in which the grinding brush waits at a position away from the steel strip to be ground. A position away from the steel strip usually refers to a position where the brush is released from the grinding equipment. If this release position is K, the distance K (mm) between the tip of the brush and the center of the thickness of the steel strip is not particularly limited, but in the equipment of the present invention, a position 50 mm to 150 mm away is preferable. This release position is also a standby position for replacing the brush or performing maintenance.

[0046] Next, the pre-movement step [P M ], the brush is placed in the above-mentioned pre-waiting step [P W This is the step in which the brush moves from the waiting position K in the brush waiting step [W] to the waiting position L in the brush waiting step [W]. The moving speed in this step is the pre-movement step moving speed V P (mm / sec), and the time required for movement is the pre-movement step movement time T P (seconds).

[0047] Specific movement speed V P The moving time T P The time is between 5 and 15 seconds. The subsequent steps after the brush standby step are as described in the first pattern above.

[0048] In Fig. 8 showing this second pattern, the solid line indicates the change in the brush tip in the previous (n-1)th time, and the dotted line indicates the change in the brush tip in the nth time when the roll-down delay adjustment of the present invention is not performed. n (mm), the distance from the brush release position to the brush contact position is [K+δ n 〕(mm). Therefore, as in the first pattern described above, the amount of wear δn Since the travel distance increases by the distance of , the time until the nth contact with the brush is delayed compared to the n-1th contact. The press-down delay time T D (sec) is the brush movement speed V M (mm / sec), [T D = δ n / V M ] can be calculated.

[0049] [Third pattern] The third pattern is shown in Figure 14. This third pattern divides the brush movement process [M] in the first pattern into two steps based on the movement speed. That is, the process is as follows, in the order of the arrows: "brush waiting process [W]" → "brush movement process first step [M 1 〕」→「Brush movement process 2nd step〔M 2 〕” → “Grinding process (B)”.

[0050] The brush movement process is divided into two steps in order to change the movement speed during the movement. 2 〕 movement speed V M2 (mm / sec) is the first step [M 1 〕 movement speed V M1 (mm / sec). The second step movement speed V M2 The reason for setting the speed to a low value is to reduce the speed just before contacting the brush and to slowly approach the steel strip, thereby reducing the impact of contact with the steel strip.

[0051] First step movement speed V M1 Specifically, the time required for the movement, the first step movement time T M1 (Seconds) is approximately 1 to 5 seconds.

[0052] In addition, the second step movement speed V M2 (mm / sec) is the first step moving speed V M1It is preferable that the second step movement time T M2 (Seconds) is approximately 5 to 15 seconds.

[0053] The speed can be adjusted by controlling the speed over time using a timer, or by controlling the load current value to the drive device for rotating the brush, etc. Timer control is preferably used for high-speed roll-down control, and load current control is preferably used for low-speed roll-down control.

[0054] In Fig. 14 showing this third pattern, the solid line indicates the change in the brush tip portion in the previous (n-1)th time, and the dotted line indicates the change in the brush tip portion in the nth time when the roll-down delay adjustment of the present invention is not performed. n (mm), the distance from the brush standby position to the brush contact is [L+δ n 〕(mm). Therefore, as in the first pattern described above, the amount of wear δ n Since the travel distance increases by the distance of , the time until the nth contact with the brush is delayed compared to the n-1th contact. The press-down delay time T D (sec) is the final second step movement speed V M2 (mm / sec), [T D = δ n / V M2 ] can be calculated.

[0055] [Fourth pattern] The fourth pattern is shown in FIG. 20. In this fourth pattern, the brush movement process [M] is divided into two steps according to the movement speed in the second pattern described above, similar to the third pattern described above. That is, the process is divided into two steps according to the arrows, namely, "pre-waiting step [P W 〕」→「Pre-move step〔P M 〕" → "Brush standby process [W]" → "Brush movement process 1st step [M 1 〕」→「Brush movement process 2nd step〔M 2 〕” → “Grinding process (B)”.

[0056] The waiting time, moving speed and moving time in each process and step are as described in the first to third patterns above.

[0057] In Fig. 20 showing the fourth pattern, the solid line indicates the change in the brush tip portion in the previous (n-1)th time, and the dotted line indicates the change in the brush tip portion in the nth time when the roll-down delay adjustment of the present invention is not performed. n (mm), the distance from the brush release position K to the brush contact position is [K+δ n 〕(mm). Therefore, as in the previous patterns, the amount of wear δ n Since the travel distance increases by the distance of , the time until the nth contact with the brush is delayed compared to the n-1th contact. The press-down delay time T D (sec) is the final second step movement speed V M2 (mm / sec), [T D = δ n / V M2 ] can be calculated.

[0058] [How to adjust the roll down delay] The adjustment method for eliminating the delay in brush grinding (pressing down delay) caused by brush wear as described above will be described in detail below.

[0059] As mentioned above, there are two types of adjustment methods: a method in which the movement speed is not changed (fixed) and the timing (time) of the movement is changed to adjust (movement time adjustment method), and a method in which the movement speed itself is changed to adjust (movement speed adjustment method). The specific contents of the two types of adjustment methods will be explained for each of the four process patterns with reference to the drawings.

[0060] In addition, whether to select the moving time adjustment method or the moving speed adjustment method is preferably determined based on the operating conditions of the entire process including the brush grinding process, the equipment specifications, and other conditions, and the adjustment method that is easier to control is selected.

[0061] [First pattern of roll down delay adjustment method 1-1 (travel time adjustment method)] FIG. 6 shows the first pattern of the rolling delay adjustment method 1-1. This is the brush movement time T M The dashed line in FIG. 6 represents the transition of the distance of the brush tip when adjusted according to the present invention. A (Delay adjustment time) is used to advance the delay. A is the rolling delay time T D and is calculated by equation (1). T A = δ n / V M ... (1) This adjustment reduces the brush movement time T M is T A The brush contact timing is the same as the previous (n-1) result, and a press-down delay can be avoided. M T A This means that the previous brush waiting time T W T A This is equivalent to shortening the

[0062] [First pattern: Pressure drop delay adjustment method 1-1' (travel speed adjustment method)] FIG. 7 shows the first pattern of the rolling delay adjustment method 1-1'. This is the brush movement speed V M The dashed line in FIG. 7 represents the change in the distance of the brush tip when adjusted according to the present invention. That is, the moving speed V M The new moving speed V is calculated using the following formula (2): M Change to ´. V M ´=(L+δ n ) / T M (2) Here, L is the distance between the tip of the brush and the center of the thickness of the steel strip during the brush waiting process [W].

[0063] In other words, the brush movement speed is V M´, the brush travel distance is the previous wear amount δ n The distance [L+δ n 〕, the brush movement time T M does not change, the timing of brush contact will be the same as the previous (n-1) time. As a result, the rolling delay can be avoided.

[0064] [Second pattern of rolling delay adjustment method 2-1~3 (travel time adjustment method)] In the second pattern shown in FIG. 8, the process step in which the brush moves is the pre-movement step [P] of the pre-preparation process [P]. M 〕 and the brush movement process [M]. In the case of the movement time adjustment method, there are two places where the movement time can be adjusted. Therefore, the movement time T P (Adjustment method 2-1), the brush movement process travel time T M There are three methods: one for adjusting the temperature in the same way (adjustment method 2-2), and one for adjusting the temperature by dividing the time between the two steps (adjustment method 2-3). These methods are shown in Figure 9 (adjustment method 2-1), Figure 10 (adjustment method 2-2), and Figure 11 (adjustment method 2-3).

[0065] [Adjustment method 2-1] First, the adjustment method 2-1 in Fig. 9 is a pre-movement step [P M ] travel time T P This is a method of adjusting the moving time T P T A (Delay adjustment time) is adjusted to be longer. A is the rolling delay time T D and is given by equation (20). T A = δ n / V P ... (20) This adjustment reduces the pre-movement step movement time T P is T A The pre-movement step movement time T P TA This means that the brush standby time T W T A This is equivalent to shortening the

[0066] [Adjustment method 2-2] Next, in the adjustment method 2-2 of FIG. 10, the movement time T M This is a method of adjusting the moving time T M T A (Delay adjustment time) is made to extend the start time of the brush movement process [M]. A (Delay adjustment time) is used to advance the delay. A is the rolling delay time T D and is calculated by equation (1). T A = δ n / V M ... (1) This adjustment reduces the brush movement time T M is T A The brush contact timing is the same as the previous (n-1) result, and a press-down delay can be avoided. M T A This means that the previous brush waiting time T W T A This is equivalent to shortening the

[0067] [Adjustment method 2-3] Furthermore, in the adjustment method 2-3 of FIG. 11, the movement time T P and the brush movement process travel time T M This is a method of adjusting the time by dividing it between both steps.

[0068] First, the previous (n-1) actual pre-movement step movement time T P and brush movement time T M Total travel time (T P +T M ) is calculated. Next, the wear amount δ nA part of δ n1 and the pre-movement step movement speed V P From this, the first time T A1 Also, the wear amount δ n The remainder δ n2 and brush movement speed V M From this, the second time T A2 Then, T calculated by the following formula (5) A1 and T A2 Total time T A This is a method to make the total travel time longer than the previous (n-1th) time. T A1 = δ n1 / V P ... (3) T A2 = δ n2 / V M (4) T A =T A1 +T A2 ... (5) Here, δ n1 and δ n2 The relationship is expressed by the following equation (6). kδ n1 +(1-k)δ n2 = δ n ... (6) where k is δ n1 δ n is the coefficient of the allocation ratio, where k=0 to 1.

[0069] This adjustment reduces the pre-movement step movement time T P T A1 (in Fig. 11) <1> ), brush movement time T M T A2 (in Fig. 11) <2> This makes the timing of brush contact the same as the previous (n-1) time, and prevents a delay in pressing. In other words, the brush waiting time T W T in the above formula (5) A =T A1 +T A2This is equivalent to shortening the

[0070] In this preparation method 2-3, δ in the above formula (6) n If the coefficient of the distribution ratio of is k=1, then δ n = δ n1 This means the case of the above adjustment method 2-1. Also, δ n If the coefficient of the distribution ratio of k = 0, then δ n = δ n2 This means the case of the above-mentioned adjustment method 2-2. Therefore, adjustment method 2-3 includes adjustment methods 2-1 and 2-2.

[0071] [Adjustment method for the second pattern of pressure drop delay 2-1´~2´ (adjustment method for the travel speed)] As described above, in the second pattern, the process step in which the brush moves is the pre-movement step [P] of the pre-preparation process [P]. M 〕 and the brush movement process [M], and in the case of the movement speed adjustment method, there are two places where the movement speed can be adjusted. Therefore, the movement speed V P (Adjustment method 2-1´) and the moving speed V of the brush moving process M Two methods for adjusting the thickness (adjustment method 2-2') will be described below. These are shown in Figure 12 (adjustment method 2-1') and Figure 13 (adjustment method 2-2').

[0072] In addition, in the moving speed adjustment method, as in the moving time adjustment method described above, there are two places where the moving speed can be adjusted, so the wear amount δ n It is also possible to divide the above and adjust the above at both of the moving points. However, for the sake of simplicity, a method of adjusting the above at one of the moving points will be described here.

[0073] [Adjustment method 2-1´] First, the adjustment method 2-1' in FIG. 12 is a pre-movement step [P W 〕 movement speed V P The adjusted moving speed V is calculated using the following equation (7). P' By doing so, the pre-movement step [P W] travel time T P Adjustments are made to make it equal to the previous (n-1) result. V P ′=(K-L+δ n ) / T P ... (7) Here, K is the pre-waiting step [P W ], and L is the distance that the brush tip is separated from the thickness center of the steel strip in the brush waiting step [W]. The dashed line in Figure 12 shows the transition of the brush tip distance when adjusted according to the present invention. In other words, when the moving speed in the pre-movement step is V P ´, the brush movement distance [KL] in the preliminary process is n The distance [K-L+δ n 〕, the movement time T P As a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0074] [Adjustment method 2-2´] Next, in the adjustment method 2-2' of FIG. 13, the moving speed V M The adjusted moving speed V is calculated using the following formula (2). M' By doing so, the brush movement process [M] travel time T M Adjustments are made to make it equal to the previous (n-1) result. V M ′=(L+δ n ) / T M (2) Here, L is the distance that the brush tip is separated from the center of the thickness of the steel strip during the brush waiting process [W]. The dashed line in FIG. 13 shows the change in the distance of the brush tip when adjusted. In other words, when the brush moving speed is V M ´, the brush travel distance is reduced by δ n The distance [L+δ n 〕, the brush movement time T MAs a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0075] [Third pattern of rolling delay adjustment method 3-1~3 (travel time adjustment method)] In the third pattern shown in FIG. 14, the step in which the brush moves is the first step [M 1 ] and the second step [M 2 In the case of the travel time adjustment method, there are two places where the travel time can be adjusted. Therefore, the travel time T M1 (Adjustment method 3-1), the second step travel time T M2 There are three methods: one for adjusting the time in both steps (adjustment method 3-2), and one for adjusting the time in both steps (adjustment method 3-3). These are shown in Figure 15 (adjustment method 3-1), Figure 16 (adjustment method 3-2), and Figure 17 (adjustment method 3-3).

[0076] [Adjustment method 3-1] First, in the adjustment method 3-1 in Fig. 15, the first step [M 1 ] travel time T M1 The method for adjusting the start time of the first step is T A By speeding up the travel time of the first step by (the delay adjustment time), the travel time T M1 T A This T A is the rolling delay time T D and is given by equation (21). T A = δ n / V M1 ··· (twenty one) This adjustment reduces the first step travel time T M1 is T A The first step travel time T M1 T A This means that the brush standby time TW T A (δ n / V M1 ) is equivalent to shortening the

[0077] [Adjustment method 3-2] Next, in the adjustment method 3-2 of FIG. 16, the second step [M 2 ] travel time T M2 This is a method of adjusting the moving time T M2 T A (Delay adjustment time) is made longer. In other words, the first step [M 1 〕 start time T A (Delay adjustment time) (in Figure 16) <1> ) or the second step [M 2 〕 start time T A (in Fig. 16) <2> (corresponding to the arrow in the figure) A is the rolling delay time T D and is given by equation (22). T A = δ n / V M2 ··· (twenty two) This adjustment reduces the second step travel time T M2 is T A The second step travel time T M2 T A This means that the previous brush waiting time T W T A (δ n / V M2 ) is equivalent to shortening the

[0078] [Adjustment method 3-3] Furthermore, in the adjustment method 3-3 of FIG. 17, the first step travel time T M1 and the travel time of the second step T M2 This is a method of adjusting the time by dividing it into two steps.

[0079] First, the first step travel time T M1 and the second step travel time T M2 is the total travel time (T M1 +T M2 ) is calculated. Next, the wear amount δ n A part of δ n1 and the first step movement speed V M1 From this, the first time T A1 Also, the wear amount δ n The remainder δ n2 and second step movement speed V M2 From this, the second time T A2 Then, T calculated by the following formula (10) A1 and T A2 Total time T A This is a method to make the result longer than the previous (n-1th) time. T A1 = δ n1 / V M1 ... (8) T A2 = δ n2 / V M2 ... (9) T A =T A1 +T A2 ... (10) Here, δ n1 and δ n2 The relationship is expressed by the following equation (11). kδ n1 +(1-k)δ n2 = δ n ... (11) where k is δ n1 δ n is the coefficient of the allocation ratio, where k=0 to 1.

[0080] This adjustment resulted in a higher T than the previous (n-1) time. M1 T A1 (Fig. 17) <1> (corresponding to the arrow in the figure), T M2 T A2(in Fig. 17) <1> By doing so, the timing of brush contact becomes the same as the previous (n-1) time. As a result, the press-down delay can be avoided. In other words, the brush waiting time T W T in the above formula (10) A =T A1 +T A2 This is equivalent to shortening the

[0081] In this preparation method 3-3, δ in the above formula (11) n If the coefficient of the distribution ratio of is k=1, then δ n = δ n1 This means the case of the above adjustment method 3-1. Also, δ n If the coefficient of the distribution ratio of k = 0, then δ n = δ n2 This means the case of the above-mentioned adjustment method 3-2. Therefore, the adjustment method 3-3 includes the adjustment methods 3-1 and 3-2.

[0082] [Third pattern of pressure drop delay adjustment method 3-1´~2´ (travel speed adjustment method)] As described above, in the third pattern, the step in which the brush moves is the first step [M 1 ] and the second step [M 2 〕, and in the case of the movement speed adjustment method, there are two places where the movement speed can be adjusted. Therefore, the movement speed V M1 (Adjustment method 3-1´) and the second step movement speed V M2 Two methods for adjusting the saturation level (Adjustment Method 3-1') and the saturation level (Adjustment Method 3-2') are presented. These are shown in Figure 18 (Adjustment Method 3-1') and Figure 19 (Adjustment Method 3-2').

[0083] In addition, in the moving speed adjustment method, as in the moving time adjustment method described above, there are two places where the moving speed can be adjusted, so the wear amount δ n It is also possible to divide the above and adjust the above at both moving points. However, for the sake of simplicity, a method of adjusting the above at one of the moving points will be described here.

[0084] [Adjustment method 3-1´] First, in the adjustment method 3-1' of FIG. 18, the first step [M 1 〕 movement speed V M1 The adjusted moving speed V is calculated using the following equation (12). M1' By doing so, the first step [M 1 ] travel time T M1 Adjustments are made to make it equal to the previous (n-1) result. V M1 ′=(L-C+δ n ) / T M1 ... (12) Here, L is the distance that the brush tip is separated from the center of the thickness of the steel strip in the brush waiting process [W], and C is the distance that the brush tip is separated from the center of the thickness of the steel strip in the first step [M 1 ] to the second step [M 2 ] is the distance that the brush tip is separated from the center of the thickness of the steel strip when the moving speed in the first step is switched to V M1 ´, the brush movement distance [LC] in the first step is the wear amount δ n Add the distance [L-C+δ n 〕, the first step travel time T M1 As a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0085] [Adjustment method 3-2´] Next, in the adjustment method 3-2' of FIG. 19, the second step [M 2 〕 movement speed V M2 The adjusted moving speed V is calculated using the following equation (13). M2' By doing so, the travel time for the second step T M2 Adjustments are made to make it equal to the previous (n-1) result. V M2 ′=(C+δ n ) / T M2 (13) Here, C is the first step [M 1] to the second step [M 2 ] is the distance that the brush tip is separated from the center of the thickness of the steel strip when the moving speed in the second step is switched to V M2 ´, the brush movement distance [C] in the second step is the wear amount δ n The distance [C+δ n 〕, the brush movement time T M As a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0086] [Fourth pattern of rolling delay adjustment method 4-1~4 (travel time adjustment method)] In the fourth pattern shown in FIG. 20, the process step in which the brush moves is the pre-movement step [P] of the pre-preparation process [P]. M 〕, the first step of the brush moving process [M] 1 ] and the second step [M 2 Therefore, in the case of the travel time adjustment method, there are three places where the travel time can be adjusted, and there are four ways to adjust it: Adjustment method 4-1: Pre-movement step movement time T P How to adjust it. Adjustment method 4-2: First step movement time T of the brush movement process M1 How to adjust it. Adjustment method 4-3: Second step movement time T of the brush movement process M2 How to adjust it. Adjustment method 4-4: A method of adjusting by dividing the time into three steps.

[0087] These are shown in Figure 21 (Adjustment method 4-1), Figure 22 (Adjustment method 4-2), Figure 23 (Adjustment method 4-3) and Figure 24 (Adjustment method 4-4), respectively.

[0088] [Adjustment method 4-1] Adjustment method 4-1 in Figure 21 is a pre-movement step [P M ] travel time TP This is a method of adjusting the moving time T P T A (Delay adjustment time) is adjusted to be longer. A is the rolling delay time T D and is given by equation (20). T A = δ n / V P ... (20) This adjustment reduces the pre-movement step movement time T P is T A The pre-movement step movement time T P T A This means that the brush standby time T W T A This is equivalent to shortening the

[0089] [Adjustment method 4-2] Adjustment method 4-2 in Figure 22 is the first step [M 1 ] travel time T M1 The method for adjusting the start time of the first step is T A By speeding up the travel time of the first step by (the delay adjustment time), the travel time T M1 T A This T A is the rolling delay time T D and is given by equation (21). T A = δ n / V M1 ··· (twenty one) This adjustment reduces the first step travel time T M1 is T A The first step travel time T M1 T AThis means that the brush standby time T W T A (δ n / V M1 ) is equivalent to shortening the

[0090] [Adjustment method 4-3] Adjustment method 4-3 in Figure 23 is the second step [M 2 ] travel time T M2 This is a method of adjusting the moving time T M2 T A (Delay adjustment time) is made longer. In other words, the first step [M 1 〕 start time T A (Delay adjustment time) (in Figure 23) <1> ) or the second step [M 2 〕 start time T A (in Fig. 23) <2> (corresponding to the arrow in the figure) A is the rolling delay time T D and is given by equation (22). T A = δ n / V M2 ··· (twenty two) This adjustment reduces the second step travel time T M2 is T A The second step travel time T M2 T A This means that the previous brush waiting time T W T A (δ n / V M2 ) is equivalent to shortening the

[0091] [Adjustment method 4-4] In the adjustment method 4-4 in Figure 24, the process step in which the brush moves is the pre-movement step [P M 〕, the first step of the brush moving process [M] 1 ] and the second step [M2 〕, and the method involves dividing and adjusting the time among these three places.

[0092] First, the travel time T of the previous (n-1) actual pre-travel step P , brush movement process 1st step [M 1 ] travel time T M1 and the second step [M 2 ] travel time T M2 is the total travel time (T P +T M1 +T M2 ) is calculated. Next, the wear amount δ n A part of δ n1 and the pre-movement step [P M 〕 movement speed V P From this, the first time T A1 Also, the wear amount δ n Other part of δ n2 and the first step [M 1 〕 movement speed V M1 From this, the second time T A2 Furthermore, the wear amount δ n The remainder δ n3 and the second step [M 2 〕 movement speed V M2 From this, the third time T A3 Then, T calculated by the following formula (17) A1 and T A2 and T A3 Total time T A This is a method to make the result longer than the previous (n-1th) time. T A1 = δ n1 / V P (14) T A2 = δ n2 / V M1 (15) T A3 = δ n3 / V M2 ... (16) T A =T A1 +T A2 +TA3 (17) Here, δ n1 , δ n2 and δ n3 The relationship is expressed by the following equation (18). k 1 δ n1 +k 2 δ n2 +(1-k 1 -k 2 ) δ n3 = δ n ... (18) Where k 1 and k 2 is δ n1 and δ n2 δ n The coefficient of the allocation ratio for k 1 = 0 to 1, k 2 = 0 to 1, k 1 +k 2 =0~1.

[0093] This adjustment resulted in a higher T than the previous (n-1) time. P T A1 (Fig. 24) <1> (corresponding to the arrow in the figure), T M1 T A2 (Fig. 24) <2> (corresponding to the arrow in the figure), T M2 T A3 (in Fig. 24) <3> This makes the timing of brush contact the same as the previous (n-1) time, and prevents a delay in pressing. In other words, the brush waiting time T W T in the above formula (17) A =T A1 +T A2 +T A3 This is equivalent to shortening the

[0094] In this preparation method 4-4, δ in the above formula (18) n The coefficient of the distribution ratio is k 1 If = 1, then δ n = δ n1 This means the case of the above adjustment method 4-1. Also, δ n The coefficient of the distribution ratio is k2 If = 1, then δ n = δ n2 This means the case of the above adjustment method 4-2. Furthermore, δ n The coefficient of the distribution ratio is k 1 +k 2 If = 0, then δ n = δ n3 This means the case of the above-mentioned adjustment method 4-3. Therefore, adjustment method 4-4 includes adjustment methods 4-1, 4-2, and 4-3.

[0095] [Adjustment method for the fourth pattern of pressure drop delay 4-1´~3´ (adjustment method for the travel speed)] As described above, in the fourth pattern, the step in which the brush moves is the pre-movement step [P M 〕, the first step of the brush movement process [M 1 ] and the second step [M 2 〕Therefore, in the case of the movement speed adjustment method, there are three places where the movement speed can be adjusted. Therefore, the following three methods are presented as ways to adjust the movement speed. Adjustment method 4-1´: Pre-movement step movement speed V P How to adjust. Adjustment method 4-2´: Brush movement process 1st step movement speed V M1 How to adjust. · Adjustment method 4-3´: 2nd step movement speed V M2 How to adjust.

[0096] These are shown in Figure 25 (Adjustment method 4-1'), Figure 26 (Adjustment method 4-2') and Figure 27 (Adjustment method 4-3'), respectively.

[0097] In addition, in the moving speed adjustment method, as in the moving time adjustment method described above, there are three places where the moving speed can be adjusted, so the wear amount δ n It is also possible to divide the step and adjust the movement points of each step. However, for the sake of simplicity, a method of adjusting the step at one point will be described here.

[0098] [Adjustment method 4-1´] The adjustment method 4-1' in FIG. 25 is a pre-movement step [P W 〕 movement speed V P The adjusted moving speed V is calculated using the following equation (7). P' By doing so, the pre-movement step [P W ] travel time T P Adjustments are made to make it equal to the previous (n-1) result. V P ′=(K-L+δ n ) / T P ... (7) Here, K is the pre-waiting step [P W ], and L is the distance that the brush tip is separated from the thickness center of the steel strip in the brush waiting step [W]. The dashed line in Figure 25 shows the transition of the brush tip distance when adjusted according to the present invention. In other words, when the moving speed in the pre-movement step is V P ´, the brush movement distance [KL] in the preliminary process is n The distance [K-L+δ n 〕, the movement time T P As a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0099] [Adjustment method 4-2´] The adjustment method 4-2' in Figure 26 is the first step [M 1 〕 movement speed V M1 The adjusted moving speed V is calculated using the following equation (12). M1' By doing so, the first step [M 1 ] travel time T M1 Adjustments are made to make it equal to the previous (n-1) result. V M1 ′=(L-C+δ n ) / T M1 ... (12) Here, L is the distance that the brush tip is separated from the center of the thickness of the steel strip in the brush waiting process [W], and C is the distance that the brush tip is separated from the center of the thickness of the steel strip in the first step [M 1 ] to the second step [M 2 ] is the distance that the brush tip is separated from the center of the thickness of the steel strip when the moving speed in the first step is switched to V M1 ´, the brush movement distance [LC] in the first step is the wear amount δ n Add the distance [L-C+δ n 〕, the first step travel time T M1 As a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0100] [Adjustment method 4-3´] Adjustment method 4-3' in Figure 27 is the second step [M 2 〕 movement speed V M2 The adjusted moving speed V is calculated using the following equation (13). M2' By doing so, the travel time for the second step T M2 Adjustments are made to make it equal to the previous (n-1) result. V M2 ′=(C+δ n ) / T M2 (13) Here, C is the first step [M 1 ] to the second step [M 2 ] is the distance that the brush tip is separated from the center of the thickness of the steel strip when the moving speed in the second step is switched to V M2 ´, the brush movement distance [C] in the second step is the wear amount δ n The distance [C+δ n 〕, the brush movement time T M As a result, the timing of brush contact is the same as the previous (n-1) time, and a delay in rolling can be avoided.

[0101] [Correction by plate thickness d] As a method for eliminating the timing shift of the rolling down caused by the brush wear and improving the accuracy of the timing, a method for making correction taking into consideration the thickness of the steel strip will be further described.

[0102] If the plate thickness is d (mm), then the distance [D (mm)] between the steel strip surface and the brush tip is shorter by half the plate thickness d, i.e., [d / 2]. Therefore, when the steel strip is thick (also called "thick"), the influence of the distance [D] between the steel strip surface and the brush tip is greater than when the plate thickness is thin (also called "thin"). As a result, the timing of the brush pressing down on a thick plate is [d / 2V] seconds earlier than the timing of pressing down on a thin plate. Here, V represents the moving speed (mm / sec) when pressing down.

[0103] Therefore, by delaying the timing of brush reduction by [d / 2V] (seconds), it is possible to reduce the brush at a consistent timing on a line that produces steel strips of various thicknesses.

[0104] The above-mentioned correction based on the plate thickness d is preferably applied when the plate thickness d is 2.0 mm or more.

[0105] A specific pattern will be described below as an example.

[0106] First, in the case of the first pattern of the rolling delay adjustment method 1-1 in FIG. 6, the delay adjustment time T A is preferably corrected to the following equation (23): T A = δ n / V M -d / 2V M ··· (twenty three) Next, in the case of the second pattern of the rolling delay adjustment method 2-1 in FIG. 9, the delay adjustment time T A It is preferable to correct it to the following equation (24): T A = δ n / VP -d / 2V P ··· (twenty four) In the case of the second pattern of the rolling delay adjustment method 2-2 in FIG. 10, the delay adjustment time T A is preferably corrected to the following equation (23) in the same manner as in the above adjustment method 1-1. T A = δ n / V M -d / 2V M ··· (twenty three) Furthermore, in the case of the third pattern of the rolling delay adjustment method 3-1 in FIG. 15, the delay adjustment time T A It is preferable to correct it to the following equation (25). T A = δ n / V M1 -d / 2V M1 ··· (twenty five) In the case of the third pattern of the rolling delay adjustment method 3-2 in FIG. 16, the delay adjustment time T A It is preferable to correct it to the following equation (26): T A = δ n / V M2 -d / 2V M2 ... (26)

[0107] As described above, for the travel time adjustment method, the delay adjustment time T A By correcting for the plate thickness d, the timing of reduction can be adjusted with high precision. EXAMPLES

[0108] The present invention will be further described below with reference to examples. However, the following examples are merely intended to illustrate and explain the present invention in more detail, and are not intended to limit the scope of the present invention.

[0109] (Example 1) (Preparation method 1-1) (A) In the grinding method of the present invention, brush grinding was performed using the first pattern.

[0110] The specifications of the steel strips in question and the operating conditions of the brush grinding process were as follows: Steel strip (ferritic stainless steel), thickness d: 1.0 mm, width: 1200 mm, length (coil length): 2000 m, -Steel strip conveying speed (line speed): 3.3m / sec, Brush roll diameter: 350mm, brush thickness: 40mm, Distance from the tip of the brush to the center of the steel strip thickness at the brush standby position L: 10 mm, Brush waiting time T W 10 seconds (Note that the brush waiting time starts when the punch hole detector (WPD) detects a punch hole near the coil connection and ends when the brush starts to move to press down.) Brush movement time T M : 17 seconds, brush movement speed V M :0.6mm / sec, Brush use distance: 500km Under the above conditions, 68 brush grindings were performed. No adjustment was made for the reduction delay. As a result, the brush wear amount δ n The thickness was 2.9 mm, and a defective section of 16 m occurred where the oxide scale was not removed from the steel strip surface due to the delay in rolling.

[0111] Next, grinding was carried out using adjustment method 1-1 shown in Figure 6 as a rolling delay adjustment method. In the 69th test, the wear amount δ n The estimated rolling delay time T D The delay adjustment time T A As, From the above equation (1), T A = δ n / V M =3.0 / 0.6=5 seconds.

[0112] Based on this, the start time of the brush movement process is set to T A (seconds). In other words, the brush movement time T M(17 seconds) is T M +T A The video was adjusted to be longer (22 seconds).

[0113] As a result, even after the 69th brush grinding, the delay in the timing of reduction was almost eliminated, and the occurrence of defective areas where oxide scale was not removed from the steel strip surface due to a delay in reduction was reduced to 2 m.

[0114] (Example 2) (Preparation method 1-1') (b) Brush grinding was performed using the first pattern under the same conditions as in (a) above.

[0115] In this Example 2, the 53rd brush grinding was performed, and no adjustment was made for the reduction delay. As a result, the brush wear amount δ n The thickness was 2.5 mm, and a defective section of 14 m occurred where the oxide scale was not removed from the steel strip surface due to the delay in rolling.

[0116] Here, grinding was performed using adjustment method 1-1' shown in Figure 7 as the reduction delay adjustment method.

[0117] In the 54th test, the wear amount δ n was estimated to be 2.4 mm. Therefore, in order to adjust the rolling delay, the delay adjustment speed was calculated from the above formula (2), and V M ´=(L+δ n ) / T M =(10+2.4) / 17=0.73mm / sec.

[0118] Based on this, the brush movement speed is V M ´ (controlled by the load current value to the brush movement drive device) and brush grinding was performed.

[0119] As a result, even after the 54th brush grinding, the delay in the timing of reduction was almost eliminated, and the occurrence of defective areas where oxide scale was not removed from the steel strip surface due to a delay in reduction was reduced to 2 m.

[0120] (Example 3) (Preparation method 4-1) (c) In the grinding method of the present invention, brush grinding was performed using the fourth pattern.

[0121] The specifications of the steel strip in question and the operating conditions of the brush grinding process are the same as those in (a) above. Distance from the tip of the brush to the center of the thickness of the steel strip at the brush release position K: 60 mm, Distance from the tip of the brush to the center of the steel strip thickness at the brush standby position L: 10 mm, Brush movement process 1st step [M 1 ] to the second step of the same process [M 2 Distance C from the tip of the brush to the center of the thickness of the steel strip at the time of switching to 3 mm, Pre-movement step movement speed V P : 6.0mm / sec, pre-movement step movement time T P :8.5 seconds, Brush waiting time T W :5 seconds, Brush movement time T M :12 seconds, Brush movement process 1st step movement speed V M1 : 6.0 mm / sec, first step movement time T M1 :1 second, Brush movement process second step movement speed V M2 : 0.6 mm / sec, second step movement time T M2 :7 seconds, Under the above conditions, 85 brush grindings were performed. No adjustment was made for the reduction delay. As a result, the brush wear amount δ n The thickness was 3.2 mm, and a defective section of 18 m occurred where the oxide scale was not removed from the steel strip surface due to the delay in rolling.

[0122] Next, grinding was carried out using adjustment method 4-1 shown in FIG. 21 as a rolling delay adjustment method.

[0123] In the 86th test, the wear amount δ nThe estimated rolling delay time T D The delay adjustment time T A As, From the above equation (20), T A = δ n / V P =3.6 / 6.0=0.6 seconds.

[0124] Based on this, the pre-movement step movement time T P Above T A The game was adjusted to be longer by (0.6 seconds).

[0125] As a result, even after the 86th brush grinding, the delay in the timing of reduction was almost eliminated, and the occurrence of defective areas where oxide scale was not removed from the steel strip surface due to a delay in reduction was reduced to 3 m.

[0126] (Example 4) (Preparation method 4-2') (d) Under the same conditions as in (c) above, brush grinding was performed using the fourth pattern.

[0127] In this Example 4, the 61st brush grinding was performed, and no adjustment was made for the reduction delay. As a result, the brush wear amount δ n The thickness was 2.8 mm, and a defective section of 17 m occurred where the oxide scale was not removed from the steel strip surface due to the delay in rolling.

[0128] Here, grinding was performed using adjustment method 4-2' shown in Figure 26 as the reduction delay adjustment method.

[0129] In the 62nd test, the wear amount δ n was estimated to be 3.0 mm. Therefore, in order to adjust the rolling delay, the delay adjustment speed was calculated from the above formula (12), and V M1 ´=(L-C+δ n ) / T M1 =(10-3+3) / 1.0=10mm / sec.

[0130] Based on this, the brush movement speed is V M1 ´ (timer control of the brush movement drive device) and then brush grinding was performed.

[0131] As a result, even after the 62nd brush grinding, the delay in the timing of reduction was almost eliminated, and the occurrence of defective areas where oxide scale was not removed from the steel strip surface due to a delay in reduction was reduced to 3 m. [Explanation of symbols]

[0132] 1 Steel strip 2 Brush rolls 3 n-1th brush surface (previous performance) 4. nth brush surface (estimated value) δ n Wear amount (nth time) d (steel strip) plate thickness L: The distance between the brush tip at the standby position or the center of the steel strip thickness K: Distance between the brush tip and the center of the steel strip thickness at the brush open position or at that position C: The distance between the tip of the brush and the center of the steel strip thickness at the speed change position or at that position N Brush contact position T W Brush Wait Time T M Brush Movement Time V M , V M ´ Brush movement speed T P Pre-movement step movement time V P , V P ´ Pre-movement step movement speed T M1 Brush movement process 1st step movement time V M1 , V M1 ´ Brush movement process 1st step movement speed T M2 Brush movement process second step movement time V M2 , V M2´ Brush movement process second step movement speed T D Roll-down delay time T A , T A1 , T A2 , T A3 Delay Adjustment Time

Claims

1. A brush grinding method for a steel strip, which uses a brush roll that moves in an up-down direction to grind the surface of the steel strip through a plurality of steps, When performing the nth brush grinding, The wear amount δ of the brush roll n is estimated based on the previous (n-1) grinding results, The travel distance of the brush roll is multiplied by the wear amount δ n Add up The time that elapses until the tip of the brush roll contacts the surface of the steel strip in the nth time is adjusted to be the same as the time that elapsed in the previous time (n-1th time).

2. A method for brush grinding of steel strips comprising the steps of: Here, n is a natural number having a minimum value of 2 and a maximum value of 200.

2. The steps include: a brush standby process [W] in which the tip of the brush roll waits at a position spaced a distance L from the center of the thickness of the steel strip; A brush moving step [M] in which the tip of the brush roll moves until it contacts the surface of the steel strip; a grinding step [B] in which the tip of the brush roll contacts the surface of the steel strip and then presses down to grind the strip; 2. A method for brush grinding of steel strip according to claim 1, characterized in that it comprises, in this order:

3. The steps include: A pre-preparation step [P] is provided before the brush standby step [W], The advance preparation step [P] includes: A preliminary waiting step [P W 〕and, A pre-movement step [P M 〕and, 3. A method for brush grinding of steel strip according to claim 2, characterized in that it comprises, in this order:

4. The brush moving step [M] comprises: First step [M 1 ] and the second step [M 2 ], The second step [M 2 ]'s movement speed V M2 is the first step [M 1 ]'s movement speed V M1 Less than 3. A method for brush grinding of steel strips according to claim 2.

5. The brush moving step [M] comprises: First step [M 1 ] and the second step [M 2 ] and The second step [M 2 ]'s movement speed V M2 is the first step [M 1 ]'s movement speed V M1 Less than 4. A method for brush grinding of steel strips according to claim 3.

6. The adjustment, The brush movement step [M] has a movement time T M The wear amount δ and the moving speed V of the brush moving process [M] M The time T calculated from the following formula (1) A Should I make it longer than the previous performance? Alternatively, the moving speed of the brush moving step [M] is adjusted to a moving speed V obtained by the following formula (2). M' By so doing, the movement time T M is set to the same as the previous performance 3. A method for brush grinding of steel strips according to claim 2. T A =δ n / V M ・・・ (1) V M ′=(L+δ n ) / T M ・・・ (2) Here, L is the distance between the tip of the brush roll and the center of the thickness of the steel strip during the brush standby process [W].

7. The adjustment, The pre-movement step [P M ] travel time T P and the movement time T of the brush movement step [M] M The total travel time of P +T M The wear amount δ n A part of δ n1 and the pre-movement step [P M ]'s movement speed V P The first time T is calculated from the following formula (3): A1 and the wear amount δ n The remainder δ n2 and the moving speed V of the brush moving step [M] M The second time T is calculated from the following formula (4): A2 The time T A Should I make it longer than the previous performance? Or, the pre-movement step [P W ) is adjusted to the moving speed V P' By doing so, the pre-movement step [P W ] travel time T P Will it be the same as the previous performance? Alternatively, the moving speed of the brush moving step [M] is adjusted to a moving speed V obtained by the following formula (2). M' By so doing, the movement time T M is set to the same as the previous performance 4. A method for brush grinding of steel strips according to claim 3. T A1 =δ n1 / V P ・・・ (3) T A2 =δ n2 / V M ・・・ (4) T A =T A1 +T A2 ・・・ (5) Here, δ n1 and δ n2 The relationship is expressed by the following equation (6). kd n1 + (1-a) d n2 =d n ・・・ (6) Here, k is δ n1 δ n where k is a coefficient of the allocation ratio to V P ′=(K-L+δ n ) / T P ・・・ (7) V M ′=(L+δ n ) / T M ・・・ (2) Here, K is the number of the pre-waiting steps [P W 〕, and L is the distance between the tip of the brush roll and the center of the thickness of the steel strip in the brush waiting process [W], and L is the distance between the tip of the brush roll and the center of the thickness of the steel strip in the brush waiting process [W].

8. The adjustment, The first step of the brush moving process [M 1 ] travel time T M1 and the second step of the brush moving process [M 2 ] travel time T M2 The total travel time of M1 +T M2 The wear amount δ n A part of δ n1 and the first step [M 1 ]'s movement speed V M1 The first time T is calculated from the following formula (8): A1 and the wear amount δ n The remainder δ n2 and the second step [M 2 ]'s movement speed V M2 The second time T is calculated from the following formula (9): A2 The time T A Should I make it longer than the previous performance? Or, the first step of the brush moving process [M 1 ) is adjusted to the moving speed V M1 ', the first step of the brush moving process [M 1 ] travel time T M1 Will it be the same as the previous performance? Or, the second step of the brush moving process [M 2 ) is calculated by the following formula (13) M2 ', the second step of the brush moving process [M 2 ] travel time T M2 is set to the same as the previous performance 5. A method for brush grinding of steel strips according to claim 4. T A1 =δ n1 / V M1 ・・・ (8) T A2 =δ n2 / V M2 ・・・ (9) T A =T A1 +T A2 ・・・ (10) Here, δ n1 and δ n2 The relationship is expressed by the following formula (11). kd n1 + (1-a) d n2 =d n ・・・ (11) Here, k is δ n1 δ n where k is a coefficient of the allocation ratio to V M1 ′=(L-C+δ n ) / T M1 ・・・ (12) V M2 ′=(C+δ n ) / T M2 ・・・ (13) Here, L is the distance by which the tip of the brush roll is separated from the center of the thickness of the steel strip in the brush waiting step [W], and C is the distance by which the tip of the brush roll is separated from the center of the thickness of the steel strip in the first step of the brush moving step [M 1 ] to the second step of the brush moving process [M 2 ] is the distance by which the tip of the brush roll is spaced from the center of the thickness of the steel strip.

9. The adjustment, The pre-movement step [P M ] travel time T P , the first step of the brush moving process [M 1 ] travel time T M1 and the second step of the brush moving process [M 2 ] travel time T M2 The total travel time of P +T M1 +T M2 The wear amount δ n A part of δ n1 and the pre-movement step [P M ]'s movement speed V P The first time T is calculated from the following formula (14): A1 , the wear amount δ n Other part of δ n2 and the first step [M 1 ]'s movement speed V M1 The second time T is calculated from the following formula (15): A2 and the wear amount δ n The remainder δ n3 and the second step [M 2 ]'s movement speed V M2 The third time T is calculated from the following formula (16): A3 The time T A Should I make it longer than the previous performance? Or, the pre-movement step [P W ) is adjusted to the moving speed V P' By doing so, the pre-movement step [P W ] travel time T P Will it be the same as the previous performance? Or, the first step of the brush moving process [M 1 ) is adjusted to the moving speed V M1 ', the first step of the brush moving process [M 1 ] travel time T M1 Will it be the same as the previous performance? Or, the second step of the brush moving process [M 2 ) is calculated by the following formula (13) M2 ', the second step of the brush moving process [M 2 ] travel time T M2 is set to the same as the previous performance 6. A method for brush grinding of steel strips according to claim 5. T A1 =δ n1 / V P ・・・ (14) T A2 =δ n2 / V M1 ・・・ (15) T A3 =δ n3 / V M2 ・・・ (16) T A =T A1 +T A2 +T A3 ・・・ (17) Here, δ n1 , δ n2 and δ n3 The relationship is expressed by the following equation (18). k 1 d n1 +k 2 d n2 + (1--O) 1 -a 2 )d n3 =d n ・・・ (18) Here, k 1 and k 2 is δ n1 and δ n2 δ n The coefficient of the allocation ratio to k 1 = 0 to 1, k 2 = 0 to 1, k 1 +k 2 =0 to 1. V P ′=(K-L+δ n ) / T P ・・・ (7) V M1 ′=(L-C+δ n ) / T M1 ・・・ (12) V M2 ′=(C+δ n ) / T M2 ・・・ (13) Here, K is the number of the pre-waiting steps [P W ], L is the distance by which the tip of the brush roll is separated from the center of the thickness of the steel strip in the brush waiting step [W], and C is the distance by which the tip of the brush roll is separated from the center of the thickness of the steel strip in the first brush moving step [M 1 ] to the second step of the brush moving process [M 2 ] is the distance by which the tip of the brush roll is spaced from the center of the thickness of the steel strip.

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