JP6376156B2 - Trimming control method in cold rolling line - Google Patents

Description

  The present invention relates to a trimming control method in a cold rolling line.

  In the cold rolling line for steel plates, the tail end of the preceding steel plate (preceding plate) and the tip of the succeeding steel plate (following plate) are welded and continuous, and then the width end of the steel plate is moved in the plate length direction. Trimming to cold rolling.

  Trimming in the sheet length direction of the sheet width end of the steel sheet in this cold rolling line (hereinafter also simply referred to as “trimming”) is performed at both ends of the sheet width of the sheet by two sets of rotating blades in the width direction of the trimming device. In this case, the position of the blade of the trimming device is moved in the plate width direction and is generally cut to the required plate width.

  In the conventional trimming control method, when trimming across the welded portion of the preceding steel plate and the succeeding steel plate (hereinafter also simply referred to as “welded portion”), the required plate width of the following plate is determined from the required plate width of the preceding plate. Cutting was continuously performed toward the required plate width (for example, Patent Documents 1 and 2).

JP-A-4-251607 JP 2002-219610 A

  However, in the case of the conventional trimming control method as described above, in a thin steel plate mainly for edible cans, a steel plate generated when the vicinity of the weld is trimmed when the weld passes through the trimming device. Waste may roll up on the steel plate to be treated (trimmed steel plate) and interfere with downstream rolls and equipment.

  That is, in the cold rolling line, when the plate width of the succeeding plate is larger than the plate width of the preceding plate, in order to prevent the steel plate from being caught on the roll or equipment by cold rolling, So that the leading edge of the leading plate is smaller than the leading edge of the preceding plate (in other words, the leading edge of the leading plate is larger than the leading edge of the trailing plate). Ii) Shearing the steel plate mechanically or manually. For example, the plate width at the leading edge of the trailing plate is made narrower than the plate width at the tail end of the leading plate, and the plate is sheared diagonally so that the plate width increases from the leading edge of the trailing plate toward the rear. However, since this shearing does not cut continuously like trimming, the shape of the shearing part is not stable, and the shearing surface is poor. It rolls up.

  When such steel sheet scraps are rolled up, a trouble that damages the equipment is caused.

  The present invention has been made in view of the above circumstances, and in the cold rolling line for steel plates, when trimming the plate width end of the steel plate in the plate length direction, the preceding steel plate and the succeeding steel plate It is an object of the present invention to provide a trimming control method in a cold rolling line that can accurately prevent the winding of steel sheet scraps in the vicinity of a welded portion.

  In order to solve the above problems, the present invention has the following features.

  [1] In the cold rolling line of a steel plate, the tail end of the preceding steel plate and the tip of the succeeding steel plate are welded and continuous, and then the width of the steel plate is trimmed in the plate length direction. If the plate width of the succeeding steel plate is larger than the plate width of the following steel plate, the leading end of the succeeding steel plate is sheared in advance so that the leading edge plate width of the succeeding steel plate is smaller than the plate width of the rearmost steel plate. Before the welding part passes the position in the plate length direction of the trimming device blade, the blade of the trimming device is retracted from the steel plate to the outside of the plate width line, and the welding portion of the trimming device blade A trimming control method in a cold rolling line, characterized in that after passing through a plate length direction position, the blade of the trimming device is returned to the steel plate again to prevent the steel scrap from being rolled up due to the trimming of the steel plate.

  [2] Before the welded portion passes the position in the plate length direction of the blade of the trimming device, the feeding speed of the steel plate is reduced, the blade of the trimming device does not hit the welded portion, and the blade of the trimming device is the steel plate The retraction speed of the blade of the trimming device in the plate width direction and the steel plate so that the position in the plate length direction of the welded part is close to the plate length direction position of the blade of the trimming device when retreating is completed outside the plate width The position of the trimming device blade in the plate length direction on the steel plate when the trimming device blade starts to retract is determined from the feed speed of the trimming device, the trimming device blade is retracted from the steel plate in the plate width direction, and the weld and shearing portions are trimmed. After passing the position in the plate length direction of the blade of the device, the trimming device blade is returned to the steel plate again, thereby suppressing the range where the plate width becomes defective, and rolling up the steel plate scraps by trimming the steel plate. To prevent Trimming control method in a cold rolling line according to the above [1], wherein.

  According to the present invention, in the cold rolling line of a steel plate, when trimming the width end of the steel plate in the plate length direction, it is possible to accurately prevent the steel scrap from being rolled up in the vicinity of the welded portion between the preceding steel plate and the subsequent steel plate. can do. As a result, it is possible to suppress equipment damage troubles due to rolling up of steel plate scraps.

It is a figure of the trimming control flow in one Embodiment of this invention. It is a figure which shows an example of the positional relationship of the steel plate in one Embodiment of this invention, and the blade of a trimming apparatus. It is a figure which shows the Example of this invention.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram of a trimming control flow in one embodiment of the present invention.

  As shown in FIG. 1, in one embodiment of the present invention, in a cold rolling line for steel plates, the tail end of a preceding steel plate (leading plate) and the tip of a succeeding steel plate (following plate) are welded and continuous. Then, when trimming the plate width end portion of the steel plate in the plate length direction, the plate width direction position of the blade (trimming blade) of the trimming device is controlled by the following flow.

  (S1) It is determined whether or not the leading edge width of the succeeding board is larger than the width of the leading edge of the preceding board. In the case of YES, that is, when the plate width of the succeeding plate is larger than the plate width of the preceding plate, the succeeding plate is previously set so that the foremost plate width of the succeeding plate is smaller than the plate width at the end of the preceding plate. The tip of the wire is sheared and welded, and the process proceeds to (S2). On the other hand, in the case of NO, the trimming blade is continuously moved from the target cutting position of the preceding plate toward the target cutting position of the succeeding plate, as is conventional.

  (S2) Tracking the welded portion between the preceding plate and the succeeding plate, and before the welded portion passes the position of the trimming blade (position in the plate length direction), the trimming blade is moved outwardly from the steel plate width line. Move to retreat to the retreat position.

  (S3) It is determined whether or not the trimming blade is retracted to the retracted position. If YES, the process proceeds to (S4), and if NO, the process returns to (S2).

  (S4) If necessary, the trimming blade is put on standby at the retracted position.

  (S5) The welded part and the sheared part are tracked to determine whether the welded part and the sheared part have passed the position of the trimming blade (plate length direction position). If YES, the process proceeds to (S6), and if NO, the process returns to (S4).

  (S6) The trimming blade is returned to the steel plate again, and the trimming blade is trimmed by being positioned at the target cutting position of the succeeding plate.

  FIG. 2 is a diagram showing an example of the positional relationship between the steel plate and the blade of the trimming device in one embodiment of the present invention, and shows the plate width one-side direction 1/2 from the center of the plate width.

  First, before the welded portion passes the position of the blade of the trimming device (plate length direction position), the blade of the trimming device does not hit the welded portion while lowering the feed rate of the steel plate from the steady state, and the trimming device When the blade of the trimming device finishes trimming the preceding plate, the position of the welded portion (plate length direction position) is close to the position of the blade of the trimming device (plate length direction position) within 2 m. From the width direction withdrawal speed and the steel sheet feed speed, a position on the steel sheet (position in the board length direction) when the blade of the trimming device starts to retract is obtained. Next, when the calculated position on the steel plate (position in the plate length direction) arrives at the position of the blade of the trimming device (position in the plate length direction), the plate width direction from the steel plate of the trimming device blade to the outside of the line Start evacuation to.

  After the trimming device blade is retracted, when the welded portion and the shearing portion pass the position of the trimming device blade (position in the plate length direction), the trimming device blade is returned to the steel plate again, and the succeeding plate Trimming is performed at the target cutting position.

  Thus, in this embodiment, in the cold rolling line, when trimming the steel plate width end portion in the plate length direction, while suppressing the range in which the plate width becomes defective, the preceding plate and the following plate It is possible to accurately prevent the steel sheet scrap from rolling up in the vicinity of the welded portion. As a result, it is possible to suppress equipment damage troubles due to rolling up of steel plate scraps.

  Examples of the present invention will be described.

  The conventional example is a case where the trimming device is continuously moved across the welded portion from the target cutting position of the preceding plate toward the target cutting position of the succeeding plate as in the prior art.

  In contrast, the example of the present invention is a case where trimming control is performed based on the above-described embodiment of the present invention.

  In FIG. 3, the comparison of the frequency | count of generation | occurrence | production since the start of the equipment trouble investigation by rolling-up of steel plate waste is shown. As shown in FIG. 3, in the first to fourth years of the conventional example, five to six times of troubles occur annually, while in the fifth to sixth years in which the present invention example is applied. In the eyes, no trouble has occurred.

  This confirmed the effectiveness of the present invention.

Claims (2)

  In the cold rolling line of a steel plate, after the tail end of the preceding steel plate and the tip of the succeeding steel plate are welded and made continuous, the width of the preceding steel plate is trimmed in the length direction of the steel plate. If the plate width of the succeeding steel plate becomes larger, the leading end of the succeeding steel plate is sheared in advance so that the leading edge plate width of the succeeding steel plate is smaller than the plate width of the rearmost steel plate before welding. Before the welded portion passes the position of the trimming device blade in the plate length direction, the trimming device blade is retracted from the steel plate to the outside of the plate width line, and the welded portion is the plate length of the trimming device blade. A trimming control method in a cold rolling line characterized in that after passing through the directional position, the blade of the trimming device is returned to the steel plate again to prevent the steel scrap from rolling up due to the trimming of the steel plate.   Before the welded portion passes the position in the plate length direction of the blade of the trimming device, the feeding speed of the steel plate is reduced, the blade of the trimming device does not hit the welded portion, and the blade of the trimming device is the plate width of the steel plate. The retracting speed of the blade of the trimming device and the feeding speed of the steel plate so that the position in the plate length direction of the welded part comes close to the plate length direction position of the blade of the trimming device within 2 m when retreating is completed. To obtain the position in the plate length direction on the steel plate when the trimming device blade starts to retract, retract the trimming device blade in the plate width direction from the steel plate, and the weld and shearing portions are the blades of the trimming device. After passing the position in the plate length direction, the trimming device blade is returned to the steel plate again, thereby preventing the steel plate scrap from rolling up due to the trimming of the steel plate while suppressing the range where the plate width becomes defective. Features Trimming control method in a cold rolling line according to claim 1.

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