JP5332577B2 - Steel strip continuous processing equipment and continuous processing method - Google Patents

Description

  The present invention relates to a steel strip continuous processing facility and a continuous processing method, and more particularly, to a steel strip continuous processing facility and a continuous processing method having a welding machine and a trimming device.

  As one of the processing steps for steel strips manufactured at steelworks, the widthwise ends (edges) of the irregular steel strips obtained in the hot rolling process are arranged facing each other, called trimmers or side trimmers. There is a trimming step of trimming to a predetermined width with equipment having two pairs of disk-shaped knives rotating in a row. The width of the steel strip after trimming (hereinafter referred to as “trim width”) is determined in advance in consideration of the width of the steel strip as the final product and the width change in the process accompanying the trimming process.

  In the continuous treatment line of steel strip, when the trim width of the preceding steel strip and the trim width of the following steel strip are different, conventionally, arc-shaped notches are provided at both ends of the weld points of the two, and the weld points When the line moved to the trimmer, the trim width was changed by temporarily stopping the line and moving the knife. However, with this method, it is necessary to stop the line every time the trim width changes, and a reduction in production efficiency is inevitable. Further, since trim scraps are interrupted every time the trim width is changed, trim scraps that are newly cut out after being temporarily interrupted are often not properly put into the trim scrap disposal facility, and often cause trim troubles.

  Therefore, in Patent Document 1, the cutter knife and the knife shaft are horizontally swiveled around the swivel axis with the symmetrical center of the two pairs of cutter knives of the side trimmer as the swivel center axis, An invention relating to a side trimmer configured to continuously cut while performing width change is disclosed. According to the present invention, the trim width can be changed without stopping the line and without interrupting trim debris. Therefore, the production efficiency is reduced due to the line stop when the trim width is changed, and trimming by newly trimmed trim debris is performed. Trouble occurrence can be greatly reduced.

  On the other hand, in order to stabilize the trimming operation, it is necessary to accurately center the steel strip in the line width direction. When the width center of the steel strip is offset with respect to the width center of the line, the width of trim scrap on the opposite side to the offset side (hereinafter referred to as “trim allowance”) becomes narrow, which causes trim trouble. Therefore, Patent Documents 2 and 3 disclose inventions related to a side trimmer that includes a steering roll for correcting a supply deviation of a steel strip on the entry side of the side trimmer.

  Further, in Patent Document 4, a sheet width meter is installed on the upstream side of the side trimmer, and it is determined whether or not trimming can be performed on the steel strip before trimming is started. An invention relating to a method for determining whether or not to allow side trimming to stop trimming is disclosed. Further, Patent Document 5 relates to a side trimming method for a metal body in which the strip width of a steel strip is measured by a strip width meter installed in front of a trimmer in a continuous annealing facility, and a trim margin is insufficient for trimming. The invention is disclosed. These inventions are particularly effective for a trim trouble at a portion that is trimmed at a high speed in the longitudinal central portion of the steel strip.

However, neither of these inventions can prevent the occurrence of trim trouble before and after the welded portion between the preceding steel strip and the following steel strip.
In Patent Document 6, a center deviation amount at a welded portion is measured by a plate width meter installed upstream of a trimmer, and a trim width at the time of passing a welding point is changed according to the deviation amount, thereby obtaining a welded portion. An invention relating to a method for reducing trim troubles is disclosed.
JP 60-9613 A JP 2000-190123 A JP 2000-225512 A JP-A-10-156618 Japanese Patent No. 2000-158227 JP 2000-254815 A

  However, even based on the invention disclosed in Patent Document 6, it is difficult to sufficiently suppress the trim trouble before and after the welded portion, and establishment of a technique for further suppressing this trim trouble is required.

  The object of the present invention has been made in view of the above circumstances, and when a steel strip is continuously processed using a continuous processing facility for a steel strip having a welding machine and a trimming device, a stable weld zone running time is achieved. It is to provide a continuous processing equipment and a continuous processing method for a steel strip capable of realizing width change trimming.

The present invention includes a welding machine that obtains a welded steel strip by butting the tail end of the preceding steel strip and the tip of the following steel strip, and trimming that cuts the plate width end portion of the traveling welded steel strip. Is a continuous treatment facility for steel strips provided with a device, and is provided on the upstream side of the welder or in the welder, and measures camber amounts at the tail end of the preceding steel strip and the tip of the subsequent steel strip. And a control means for controlling the trimming device so that the trim width is narrowly changed in the sections before and after the welded portion of the welded steel strip based on the camber amount measured by the camber measuring means. It is a steel strip continuous processing facility.

  The steel strip continuous processing facility according to the present invention is further arranged upstream of the welder to cut a portion including the tail end of the preceding steel strip and / or a portion including the tip of the following steel strip. It is preferable to provide a cutting device.

  From another point of view, the present invention uses the above-described continuous treatment equipment for steel strip according to the present invention, and measures the amount of camber at the tail end of the preceding steel strip and the tip of the following steel strip by the camber measuring means. Then, the steel strip continuous processing method is characterized in that the trim width when the welded portion of the welded steel strip passes through the trimming device is set based on the measured camber amount.

  In the steel strip continuous processing method according to the present invention, when the measured camber amount is larger than a preset trim propriety determination threshold, the trim width of the welded portion is smaller than the trim width of other portions other than the welded portion. Thus, it is preferable to set the trim width.

  From another viewpoint, the present invention uses the above-described continuous processing equipment for steel strip according to the present invention, and the camber amount at each of the tail end of the preceding steel strip and the tip of the following steel strip is measured by the camber measuring means. When the measured camber amount exceeds a preset cutting necessity determination threshold value, a portion including the tail end of the preceding steel strip and / or a portion including the tip of the following steel strip is removed by the cutting device. It is the continuous processing method of the steel strip characterized by cutting.

  ADVANTAGE OF THE INVENTION According to this invention, when continuously processing a steel strip using the continuous processing equipment of the steel strip which has a welding machine and a trimming apparatus, it can implement | achieve the stable width change trimming of a welding part, trim The reduction in production efficiency due to troubles can be greatly suppressed, and the steel strip can be passed directly through the process line without adding a process to cut down the narrow end of the steel strip or tail. It is possible to prevent the lead time from being extended due to the increase of.

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out a steel strip continuous processing facility and a continuous processing method according to the present invention will be described below in detail with reference to the accompanying drawings.
First, the principle of the present invention will be briefly described.

  The inventors of the present invention conducted intensive studies to find out the cause of many trim troubles before and after the welded portion of the welded steel strip even when the running width was changed. As a result, it has been found that there is a steep camber before and after the weld zone of the welded steel strip.

  FIG. 1 is a graph showing the actual measurement results of camber amount and plate thickness at the tip and tail ends of a welded steel strip. As shown in the graph of FIG. 1, there is a steep camber that reaches 1%, depending on the plate width, before and after the welded portion of the welded steel strip.

  The reason for this is that in the hot rolling process, it is common to pass the material to be rolled through a hot rolling mill one by one, and the tension between the stands is not applied to the tip and tail ends. It is presumed that the material to be rolled easily bends in the horizontal direction due to leveling deviation, asymmetry of the sheet thickness distribution in the sheet width direction of the material itself.

  Since the distance between the stands of the hot finish rolling mill is generally about 5 to 6 m, the camber generated at the tip and tail ends of the material to be rolled is the tip or tail end of the hot-rolled steel strip. Often occurs in an area in the range of 5 to 10 m.

  When the present inventors trim a steel strip having a camber at the tip and tail ends, the steel strip abruptly offsets from the line center in the vicinity of the welded portion, causing a trim trouble. I found it easier.

  Therefore, the inventors obtained the camber amounts of the leading end of the preceding steel strip and the leading end of the following steel strip before butt welding the preceding steel strip and the following steel strip, and this camber. We thought that it would be possible to prevent the occurrence of trim trouble by changing the trim width before and after the weld based on the amount.

  FIG. 2 is an explanatory diagram showing a trim trajectory at the time of a general change in the running width, which is a preceding steel strip (hereinafter referred to as “preceding steel strip”) S1 constituting the welded steel strip S and a subsequent steel strip. A trim trajectory 2 before and after the welded portion 1 when there is no camber in any of S2 (hereinafter referred to as “following steel strip”) is schematically shown. When there is no camber in the preceding steel strip S1 and the succeeding steel strip S2, trimming of the welded steel strip S can be continued without stopping trim lines with the change in trim width and without stopping the line. it can.

FIG. 3 is an explanatory view schematically showing a trim trouble occurrence situation when a camber is present at the tail end of the preceding steel strip S1.
As shown in FIG. 3, when the portion 3 where the camber exists passes through the center position control device (CPC device) 4, the welded steel strip S moves in the direction of the arrow that is the camber direction (downward in the drawing). However, in order to correct this, the centering device 5 installed in front of the CPC device 4 shifts the welded steel strip S in the direction of the arrow (upward in the drawing) which is opposite to the camber. As a result, at the position of the trimming device 6, the welded steel strip S is off-centered in the direction in which the centering device 5 is shifted, and the trim margin at the edge 7 opposite to the off-centered side cannot be secured, causing a trim trouble.

FIG. 4 is an explanatory view schematically showing a trim trouble avoiding method when a camber is present at the tail end of the preceding steel strip S1.
As shown in FIG. 4, when a camber is present at the tail end of the preceding steel strip S1, the trim margin is secured by narrowly changing the trim width in the section 8 before and after the weld 1 based on the degree of camber. be able to. The change of the trim width is preferably started at a timing at which the point (point A) where the camber at the tail end of the preceding steel strip S1 exceeds a predetermined value passes through the CPC device 4.

FIG. 5 is an explanatory view schematically showing a trim trouble occurrence state when a camber is present at the tip 9 of the trailing steel strip S2.
If a camber is present at the tip 9 of the trailing steel strip S2, the welding steel strip S is in the opposite direction to the camber when the camber portion 9 passes through the CPC device 4 as described with reference to FIG. In order to correct this, the centering device 5 installed on the entry side of the CPC device 4 shifts the welded steel strip S in the same direction as the camber. As a result, at the position of the trimming device 6, the welded steel strip S moves in the direction in which the centering device 5 is shifted, and the trim margin of the edge portion 10 on the opposite side to the moved side cannot be secured, causing a trim trouble.

FIG. 6 is an explanatory view schematically showing a trim trouble avoiding method when a camber is present at the tip 9 of the trailing steel strip S2.
As shown in FIG. 6, even when a camber is present at the tip 9 of the trailing steel strip S2, the trim margin is changed by narrowing the trim width in the section 11 before and after the welded portion 1 in accordance with the degree of camber. It can be secured. The trim width is preferably changed when the steep camber starts to pass through the CPC device 4, that is, when the welding point 1 passes through the CPC device 4 as shown in FIG. Also, the trim width change completion point is the starting point for changing the running width of the trailing steel strip S2 so that the camber at the tip of the trailing steel strip S2 becomes a predetermined value or less (point B). May be determined by calculating back. The length required for changing the running width is determined depending on the line speed, the width change speed of the trimmer housing, the width change amount, etc., and may be appropriately determined in consideration of these.

The present invention is based on the above principle. Next, the best mode for carrying out the present invention will be described.
FIG. 7 is an explanatory view schematically showing a system configuration for realizing the steel strip continuous processing method of the present invention, and schematically shows the configuration of the steel strip continuous processing equipment 20 according to the present invention. FIG.

  As shown in the figure, the continuous processing facility 20 includes a camber measuring means 21, a cutting device 22, a welding machine 23, a trimming device 24, and a line control device 25, which will be described in order. In addition, the code | symbol 26 in FIG. 7 is a payoff reel, and the code | symbol 27 is a processing facility.

[Camber measuring means 21]
The camber measuring means 21 is provided on the entry side of the welding machine 23 to be described later or in the welding machine, and measures the camber amount at the tail end of the preceding steel strip S1 and the tip of the succeeding steel strip S2. There are various methods for the camber measuring means, and any of them can be applied to the camber measuring means 21 in the present invention, and some typical examples thereof will be described.

  FIG. 8 is an explanatory diagram schematically showing a camber measurement method, and shows a method of measuring the camber amount using the camber measurement means 21 installed on the entry side of the welding machine 23. Reference numerals 28-1 and 28-2 in FIG. 8 are centering devices for the steel strips S <b> 1 and S <b> 2 installed on the entry side and the exit side of the camber measurement means 21. The steel strips S1 and S2 can be said to be at the center in the width direction of the line at the centering position by the centering devices 28-1 and 28-2. For this reason, in the position of the camber measuring means 21, when the steel strips S1 and S2 have a bending in the width direction (camber), an off-center corresponding to the camber portion occurs with respect to the center in the line width direction. By continuously measuring this with the camber measuring means 21, it is possible to measure the camber distribution at the tips and tails of the steel strips S1, S2.

Fig.9 (a) is a graph which shows an example of the camber amount distribution of the tail end 3 of the preceding steel strip S1, and Fig.10 (a) shows an example of the camber amount distribution of the tip 9 of the succeeding steel strip S2. It is a graph.
In the camber measurement method shown in FIG. 8, the camber amount is measured with reference to the centering devices 28-1 and 28-2, but the same method is used even when such a centering device is not used or not used. Thus, the camber amount distribution can be measured. However, in this case, since the steady portion of the steel strips S1 and S2 is assumed to exist in the center in the width direction with respect to the line, for example, the inserted coil is offset in the width direction with respect to the line center. In such a case, there is a possibility that the steel strips S1 and S2 are offset from the line center at the position of the camber measuring means 21 even if the steel strips S1 and S2 do not have a bending in the width direction (camber). In such a case, since the camber amount is not accurately measured, for example, a distance (for example, 5 to 10 m) in the longitudinal direction from each of the tip and tail ends is determined and used as a reference point, and the camber amount measured at that position. If the camber amount at each point is represented by the deviation from the above, it is possible to measure the camber amount more accurately.

In the above description, the case where the camber measuring means 21 is provided upstream of the welding machine 23 is taken as an example, but the camber measuring means 21 can also be provided in the welding machine 23.
FIG. 11 is an explanatory view schematically showing an example of a method for measuring the camber amount in the welding machine 23.

  In the example shown in FIG. 11, the off-center amount is measured using a plate end detection sensor 29 provided in the welding machine 23. Plate end detection capable of detecting the width direction ends of the preceding steel strip S1 and the succeeding steel strip S2 at the head in the welding direction of the carriage 30 on which a laser welding head (not shown) constituting the welding machine 23 is mounted. A sensor 29 is mounted, and the difference between the plate edge position detected by the plate end detection sensor 29 and the plate edge position detected by the side guides 31A and 31B is calculated as a camber amount. In this case, the preceding steel strip S1 and the trailing steel strip S2 are completely centered at the positions of the side guides 31A and 31B, and the camber is present only on the welding machine 23 side of the positions of the side guides 31A and 31B. Further, it is assumed that no change in plate width occurs in the preceding steel strip S1 and the subsequent steel strip S2 on the welding machine 23 side from the positions of the side guides 31A and 31B.

  In the case of the welding machine 23 provided with the plate end detection sensor 29 as shown in FIG. 11, the camber amount is measured by the plate end detection sensor 23, and either the clamp 32A or the clamp 32B is measured according to the measured value. Either or both of them can be moved in the width direction to perform centering of the butt portion.

  As another method, in the butt | matching state shown in FIG. 11, the part including the tail end of preceding steel strip S1 with the camera which is not shown attached to the upper part of the welding machine 23, and the part including the front-end | tip of succeeding steel strip S2 Is used to measure the amount of deviation from the line center at the center of the plate width of each of the portion including the tail end of the preceding steel strip S1 and the portion including the tip of the subsequent steel strip S2 You can also

  In the method of measuring the amount of deviation from the line center at the center of the plate width of each of the portion including the tail end of the preceding steel strip S1 and the portion including the tip of the subsequent steel strip S2 in the welding machine 23, FIG. A longitudinal distribution of the camber amount as shown in (a) or FIG. 10 (a) cannot be obtained. In this case, using the position of the steel plate centering device (side guides 31A, 31B) closest to the tip and tail as a reference (camber amount = 0 mm), a straight line between the measured tip and tail camber amounts. A virtual camber distribution can be obtained by a method such as interpolation by using the method.

  Moreover, in the method of measuring the amount of deviation from the line center at the center of the plate width of the portion including the tail end of the preceding steel strip S1 and the portion including the tip of the subsequent steel strip S2 in the welding machine 23, the camber The portion exceeding the predetermined value cannot be cut by the cutting device 22 installed upstream of the welding machine 23. In this case, the effect of the present invention can be obtained by performing the trim width change based on the actual camber amount by welding without cutting, but it is necessary to realize a more stable trim operation. Accordingly, the cutting may be repeated until the camber amount becomes a predetermined value or less by a cutting device arranged in the welding machine 23.

[Cutting device 22]
In FIG. 7, the cutting device 22 is disposed on the entry side of the welding machine 23 and cuts a portion including the tail end of the preceding steel strip S1 and / or a portion including the tip of the subsequent steel strip S2. It is. As the cutting device, a well-known and conventional device may be used.

[Welding machine 23]
The welding machine 23 is for obtaining the welded steel strip S by abutting and welding the tail end of the preceding steel strip S1 and the tip of the succeeding steel strip S2, and this type of well-known conventional welding machine 23 is used. The device may be used.

[Trimming device 24]
The trimming device 24 has two pairs of disk-shaped knives that are arranged to face each other and rotate, and the two pairs of knives cut the plate width end of the traveling welded steel strip S to a predetermined width. As the trimming apparatus, a known and commonly used trimming apparatus may be used.

[Line control device 25]
The line control device 25 has a function of setting a trim trajectory in the trimming device 24 for the welded steel strip S in which the preceding steel strip S1 and the subsequent steel strip S2 are welded.

  In FIG. 7, the camber amounts measured by the camber measuring means 21 at the tail end of the preceding steel strip S1 and the tip end of the following steel strip S2 are sent to the host process computer 33 via the line controller (PLC) 25. Sent. The host process computer 33 calculates the trim trajectory before and after the welded portion 1 based on the transmitted camber amount, and transmits the calculated trim trajectory to the trimmer control device 34 via the line control device 25 again. The trimmer control device 34 controls the trimmer 24 so as to draw the transmitted trim trajectory when the weld 1 passes through the trimmer 24.

Next, a method for calculating an appropriate trim locus from the camber amount actually measured by the camber measuring means 21 will be described.
FIG. 9A is a graph showing an example of the camber amount distribution of the tail end 3 of the preceding steel strip S1 measured by the camber measuring means 21 installed on the entry side of the welding machine 23 in the continuous processing line 20 of the steel strip. It is. Moreover, FIG.9 (b) is a graph which shows the method of calculating | requiring the cutting point AA from the camber measured value of the tail end of preceding steel strip S1.

  Various ways of reflecting the camber are conceivable, but basically it is better to change the trim width narrower as the camber amount increases. As an example, Formula (1) shows an example in which the trim width change value is a function of the maximum camber amount.

Trim width change value = set trim width-2 x maximum camber amount (1)
In the formula (1), the “trim width change value” is the trim width change value of the preceding steel strip S1, and the “set trim width” is the steel strip width of the final product and the width change in the process accompanying the trimming process. Is the trim width determined in consideration of the width of the steel strip. If the preceding steel strip S1 and the trailing steel strip S2 are different in width, it is the trim width on the narrow side, and the “maximum camber amount” is the leading width. The maximum camber amount of the steel strip 1 and the trailing steel strip S2 is larger.

  As shown in FIG. 9A, when the maximum camber amount at the tail end of the preceding steel strip S1 exceeds the trim possibility determination threshold, the trim width change value is obtained from the equation (1), and the measured camber amount is set in advance. The trim width change is started at the timing when the point A exceeding the trim allowability determination threshold value passes the pre-trimmer CPC, and the trim width change value calculated by the above formula (1) is changed from the set trim width of the preceding steel strip S1. To do. The trim width change start point may be a position fixed empirically.

Here, the trimability determination threshold value is set to be smaller than the nominal width, and is usually about trimming +8 mm in full width conversion so that the trim margin is about 4 mm on one side.
In the present invention, when the camber measuring means 21 is provided on the entry side of the welding machine 23 and the cutting device 22 is provided between the camber measuring means 21 and the welding machine 23, the measured camber amount is determined in advance. It is also possible to cut and remove a portion larger than the obtained value by the cutting device 22.

  As shown in FIG. 9B, the cutting necessity determination threshold value is set to be larger than the trim possibility determination threshold value. In this case, a portion where the measured camber amount exceeds the cutting necessity determination threshold value, that is, a portion between the end indicated by AA in the drawing is cut and removed by the cutting device 22 described above. Therefore, in this case, the cutting necessity determination threshold value is the maximum camber amount at the tail end of the preceding steel strip S1.

  On the other hand, FIG. 10A shows an example of the camber amount distribution at the tip 9 of the succeeding steel strip S2 measured by the camber measuring means 21 installed on the entry side of the welding machine 23 in the continuous processing line 20 of the steel strip. It is a graph to show. Moreover, FIG.10 (b) is a graph which shows the method of calculating | requiring the cutting point BB from the camber measured value of the front-end | tip of the trailing steel strip S2.

  As shown in FIG. 10A, when the maximum camber amount exceeds the trimability determination threshold value, the trim width change value is obtained by the equation (1), and the weld 1 is connected to the CPC device 4 as shown in FIG. The trim width change starts when it reaches. With respect to the timing of returning from the trim width change value to the set trim width of the subsequent steel strip S2, for example, the running distance is set so that the set trim width of the subsequent steel strip S2 is obtained at point B in FIG. It is good to change the width.

  In the present invention, as in the case of the tail end of the preceding steel strip S1, when the cutting device 22 is provided on the entry side of the welding machine 23, the measured camber amount is larger than a predetermined value. It is also possible to cut and remove by this cutting device 22.

  As shown in FIG. 10B, the cutting necessity determination threshold value is set so as to be larger than the trim possibility determination threshold value. In this case, the portion where the measured camber amount exceeds the cutting necessity determination threshold value, that is, the portion between the points indicated by BB from the forefront is cut and removed by the cutting device 22 described above. Therefore, in this case, the cutting necessity determination threshold value is the maximum camber amount at the tip of the trailing steel strip S2.

FIG. 12 is an explanatory view schematically showing a trim trajectory determining method when cambers exist at both the tail end 3 of the preceding steel strip S1 and the tip 9 of the trailing steel strip S2.
As shown in FIG. 12, when there is a camber exceeding the trim possibility determination threshold at the tail end of the preceding steel strip S1 and the tip of the succeeding steel strip S2, the trim width change start timing on the preceding steel strip S1 side (FIG. 12). Is a point on the traveling direction side by the distance between the trimmer 24 and the CPC device 4 (trimmer / CPC distance) from the point A, and the width change end point (the position of the reference numeral 35b in FIG. 12). ) After that, the trim width change value is retained. Then, on the trailing steel strip S2 side, the width change start point (position 36a in FIG. 12) is calculated backward so that point B becomes the width change end point (position 36b in FIG. 12). In this way, the trim trajectory can be determined by calculation even when there is a camber exceeding the trim possibility determination threshold at the tail end of the preceding steel strip S1 and the tip of the succeeding steel strip S2. Needless to say, the distance required for the width change may be appropriately determined in consideration of the line speed, the moving speed of the trimmer housing, the width change amount, and the like.

  As described above, according to the present invention, when the steel strip is continuously processed using the continuous processing equipment 20 of the steel strip having the welding machine 23 and the trimming device 24, the running width of the welded portion can be changed stably. Trimming can be realized, production efficiency decline due to trim trouble can be greatly suppressed, and the steel strip can be passed directly through the process line without adding a step to cut down the narrow end of the steel strip or tail. Therefore, it is possible to prevent the lead time from being extended due to an increase in the devaluation process.

Furthermore, the present invention will be described more specifically with reference to examples.
FIG. 13: is explanatory drawing which shows typically the structure of the apparatus of the Example which applied the continuous processing method of the steel strip of this invention to the continuous pickling line of a steel strip. Of the constituent elements shown in FIG. 13, the same constituent elements as those in the apparatus shown in FIG. 7 are given the same reference numerals as those used in FIG.

  This continuous processing equipment 20 is directed to the downstream side of the payoff reel 26 for paying out the steel strip. The camber measuring device 21, cutting machine 22, welding machine 23, pickling tank 27, CPC device 4, and trimming device 21 are arranged in this order. Prepare. In FIG. 13, reference numerals 37 and 42 denote bridle rolls, reference numerals 38, 40, and 41 denote centering rolls, and reference numeral 39 denotes a pre-trimmer looper.

The camber amount measured by the camber measuring device 21 at each of the leading end of the preceding steel strip S1 and the leading end of the succeeding steel strip S2 is transmitted to the line control device (PLC) 25.
The line control unit 25, together determine the trim width change amount of the welding unit 1 on the basis of the camber quantity transmitted, Ruki Yanba amount put at the tip of the tail and succeeding steel strip S2 of the preceding steel strip S1 is determined trim propriety The position information of the point larger than the threshold value is transmitted to the upper process computer 33. Based on the data sent from the line control device 25, the host process computer 33 calculates the trim trajectory at the trimmer 24 before and after the welded portion 1 and uses the calculated trim trajectory via the line control device 25. The data is transmitted to the trimmer control device 34. The trimmer control device 34 controls the trimming device 24 so as to draw the transmitted trim trajectory when the weld 1 passes through the trimmer 24.

Using the continuous processing equipment 20, the steel strip having the specifications shown in Table 1 was continuously processed. The results are shown in Table 1.
When there is a camber exceeding the trim propriety determination threshold on the preceding steel strip S1, the trim width change is started at the timing when the point corresponding to the point A in FIG. 12 passes the pre-trimmer CPC4. In addition, when there is a camber exceeding the trim propriety determination threshold on the trailing steel strip S2 side, the trim width change is started at the timing when the welding point passes the pre-trimmer CPC4. Furthermore, when the camber exceeding the trim possibility determination threshold exists in both the preceding steel strip S1 and the succeeding steel strip S2, the trim width change is started at the width change start point on the preceding steel strip S1 side.

  The determination is valid only in a total range of 20 m on the front end side and tail end side of the coil, and determination is not performed in a range beyond that.

  Example 1 in Table 1 is an example in which the present invention is applied to low carbon steel. When the trimability determination threshold value (camber amount) is set to 3 mm and there is a portion that exceeds this, the present invention is applied, and the trim width in the camber portion is changed to be narrower than the setting. The trim width after the change was determined based on the formula (1). As a result, the trouble occurrence rate before and after the weld in the trim process was less than 0.5%.

  The second embodiment is the same as the first embodiment, but is a case in which a slight camber is allowed with a trimability determination threshold of 6 mm. Compared with Example 1, although the trouble occurrence rate slightly increased, it was less than 1.0%.

Examples 3 and 4 are the same conditions as in Example 1, but the target steel type is changed. The effect of the steel type was not observed, and the trouble occurrence rate was similar to that in Example 1.
Example 5 is an example in which the same conditions as in Example 2 were used, but the portion where the camber exceeded 8 mm was cut and removed by a cutting device before welding. Since the extremely large camber was removed, the trouble occurrence rate was greatly reduced as compared with Example 2.

  On the other hand, Comparative Examples 1 and 2 are the results of examining the trim trouble occurrence rate under the condition where the present invention for performing trim width change or cutting based on the camber measurement value is not applied. %, The high trouble steel of Comparative Example 2 had a trim trouble occurrence rate of 4% or more.

FIG. 1 is a graph showing actual measurement results of camber amounts at the tip and tail ends of a steel strip. FIG. 2 is an explanatory diagram showing a trim locus at the time of a general change in the running distance. FIG. 3 is an explanatory view schematically showing a trim trouble occurrence situation when a camber is present at the tail end of the preceding steel strip. FIG. 4 is an explanatory view schematically showing a trim trouble avoiding method when a camber is present at the tail end of the preceding steel strip. FIG. 5 is an explanatory view schematically showing a trim trouble occurrence state when a camber is present at the tip of the trailing steel strip. FIG. 6 is an explanatory view schematically showing a trim trouble avoiding method when a camber is present at the tip of the trailing steel strip. FIG. 7 is an explanatory view schematically showing a system configuration for realizing the steel strip continuous processing method of the present invention. FIG. 8 is an explanatory diagram schematically showing a camber measurement method. FIG. 9A is a graph for explaining a method for obtaining the trim width change point A from the measured value of the camber at the tail end of the preceding steel strip, and FIG. 9B is the camber at the tail end of the preceding steel strip. It is a graph which shows the method of calculating | requiring cutting point AA from an actual measurement value. FIG. 10 (a) is a graph showing a method of obtaining the trim width change end point B from the measured camber value at the tip of the trailing steel strip, and FIG. 10 (b) is the measured camber value at the tip of the trailing steel strip. It is a graph which shows the method of calculating | requiring the cutting point BB from 1st. FIG. 11 is an explanatory view schematically showing an example of a method for measuring the camber amount in the welding machine. FIG. 12 is an explanatory view schematically showing a trim trajectory determination method when cambers exist at both the tail end of the preceding steel strip and the tip of the succeeding steel strip. FIG. 13: is explanatory drawing which shows typically the apparatus structure of the Example which applied the continuous processing method of the steel strip of this invention to the pickling line.

Explanation of symbols

S1 Leading steel strip S2 Subsequent steel strip 1 Welded portion 2 Trim trajectory 3, 9 Portion where camber exists 4 Center position control device (CPC device)
5 Centering device 6 Trimming device 7, 10 Edges 8 and 11 Section 20 before and after welded portion Continuous processing equipment 21 Camber measuring means 22 Cutting device 23 Welding machine 24 Trimming device 25 Line control device 26 Payoff reel 27 Processing equipment (pickling) Tank)
28-1, 28-2 Centering device 29 Plate end detection sensor 30 Carriage 31A, 31B Side guide 32A, 32B Clamp 33 Host process computer 34 Trimmer control device 35a, 35b Position 36a, 36b Position 37, 42 Bridle rolls 38, 40, 41 Centering roll 39 Trimmer front looper

Claims (5)

A welding machine that obtains a welded steel strip by abutting and welding the tail end of the preceding steel strip and the tip of the following steel strip, and a trimming device that cuts the plate-width end portion of the traveling welded steel strip. Steel strip continuous processing equipment,
A camber measuring means provided on the upstream side of the welder or in the welder and measuring a camber amount at each of a tail end of the preceding steel strip and a tip of the following steel strip, and is measured by the camber measuring means. And a control means for controlling the trimming device so that the trim width is narrowly changed in a section before and after the welded portion of the welded steel strip based on the amount of camber. Facility.   And a cutting device disposed on the upstream side of the welder for cutting a portion including the tail end of the preceding steel strip and / or a portion including the tip of the following steel strip. The continuous processing equipment of the steel strip according to claim 1.   Using the steel strip continuous processing facility according to claim 1 or 2, the camber measuring means measures the amount of camber at each of the tail end of the preceding steel strip and the tip of the following steel strip, A steel strip continuous processing method, wherein a trim width when a welded portion of the welded steel strip passes through the trimming device is set based on the measured camber amount.   The trim width is set so that the trim width of the welded portion is smaller than the trim width of other portions other than the welded portion when the measured camber amount is larger than a preset trim propriety determination threshold. Item 4. A method for continuously treating a steel strip according to Item 3.   Using the continuous processing equipment for steel strip according to claim 2, the camber amount is measured by measuring the camber amount at the tail end of the preceding steel strip and the tip of the following steel strip by the camber measuring means. However, if it exceeds a preset cutting necessity determination threshold, the cutting device cuts the portion including the tail end of the preceding steel strip and / or the portion including the tip of the following steel strip. A method for continuous treatment of steel strip.

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