JP4808478B2 - How to cut the trimmer between runs - Google Patents

Description

  The present invention relates to a running cutting method in which a trimmer round blade for side trimming a metal band such as a steel band is smoothly cut into a metal band in a high-speed plate.

  In order to trim both sides of a metal band to a predetermined width in a continuous processing line of the metal band, a round-blade trimmer is used. Conventionally, as shown in Fig. 1, in order to continuously pass through the continuous processing line, cuts (notchers) are made on both sides of the part to be welded, and the line is stopped once that part reaches the trimmer. After moving the trimmer round blade in the width direction of the metal strip, side trimming was started.

  However, in this method, the line must be stopped while the trimmer round blade is moved. Moreover, the moving speed of the trimmer round blade is usually very slow, from several mm / s to several tens of mm / s, in order to ensure accuracy, and if the cutting distance is long, it takes time to move, so the speed of the continuous processing line must be reduced. There was a case where an unexpected situation occurred and the productivity was lowered.

  Therefore, the present inventor is developing a technique for cutting the trimmer round blade into the edge of the metal strip while the metal strip is running as shown in FIG. In particular, when the plate passing speed is over 100 m / min, the trimmer round blade is repelled, making it impossible to cut between the runs at all. In particular, when the metal strip thickness is 0.4 mm or less, the phenomenon is remarkable.

  Note that Patent Document 1 discloses that a trimming round blade is inclined at a minute angle with respect to the traveling direction of a metal band to give a toe-in angle to eliminate a trimming failure. Thus, by giving an appropriate toe-in angle to the trimmer round blade, even when the trimmer round blade is detached from the metal strip due to the unevenness of the end portion of the metal strip, re-cutting can be performed smoothly. However, Patent Document 1 does not describe a method for cutting a trimmer round blade into a traveling metal strip.

Patent Document 2 describes a method of moving a trimmer round blade to the outside while running a metal strip. However, it is relatively easy to retract the trimmer round blade that has already been cut into the metal strip, but it is not easy to cut the trimmer round blade into the metal strip that is running at high speed. Such a technique is not disclosed.
JP-A-62-120908 JP-A-2-292114

  The present invention solves the above-mentioned conventional problems, and it is not necessary to stop the metal strip at the start of trimming as in the prior art, especially when the metal strip thickness is 0.4 mm or less and the high-speed passing plate exceeds 100 m / min. Another object of the present invention is to provide a trimmer run-in cutting method that can reliably cut the trimmer round blade into the edge of the metal strip as it is.

In order to solve the above-mentioned problem, the trimmer running cut method of the present invention is fixed with a predetermined toe-in angle α with respect to the running direction of a metal strip having a thickness of 0.1 to 0.4 mm. The trimmer round blade is a method of cutting the trimmer round blade into the edge of the running metal strip at a plate speed exceeding 100 mpm, which is determined by the running speed of the metal strip and the cutting speed of the trimmer round blade. The trimmer round blade is moved at a cutting speed at which the toe angle α-β of the trimmer round blade is maintained in the range of +0.08 to 0.115 ° with respect to the cut angle β. In addition, it is preferable to make the cutting peripheral speed of a trimmer round blade 30-50 mpm larger than the running speed of a metal strip.

  The trimming method of the trimmer according to the present invention is based on the trimming angle β-β with respect to the cutting angle β in consideration of the cutting speed of the trimmer round blade. It becomes possible to smoothly cut the round blade into the edge of the metal strip. For this reason, trim can be automated and it is not necessary to stop the line, so that productivity can be improved.

Preferred embodiments of the present invention are shown below.
FIG. 3 is a plan view showing the relationship between the steel strip 1 passed through at a constant traveling speed V1 in the direction of the arrow and the trimmer round blade 2 for side trimming. In this embodiment, the steel strip 1 has a thickness of 0.1 to 0.4 mm, and the traveling speed V1 is 120 to 200 mpm (m / min). The traveling speed V1 is not particularly limited. However, if the traveling speed V1 is 50 mpm or less, the trimmer round blade 2 can be cut without necessarily adopting the method of the present invention. This is particularly effective in the region where V1 exceeds 100 mpm. The trimmer round blade 2 is rotated by driving means (not shown) so that the peripheral speed of the cutting portion is faster than the traveling speed V1 of the steel strip 1.

  As described in Patent Document 1 described above, the trimmer round blade 2 is given a toe-in angle α by being inclined by a minute angle with respect to the traveling direction of the steel strip 1. Thereby, the trimming defect can be eliminated. The optimum toe-in angle α is determined by various factors, but is fixed at 0.146 °, which is the optimum angle under the above conditions. After the trimmer round blade 2 is cut to the position shown in FIG. 3, stable side trimming similar to the conventional one can be performed.

  However, when the trimmer round blade 2 is cut from the edge of the running steel strip 1, the trimmer round blade 2 must be moved at right angles to the running direction of the steel strip 1, and the inside cut is made. Since the speed V2 is combined with the travel speed V1, the travel direction of the steel sheet 1 viewed from the trimmer round blade 2 changes in the direction indicated by the vector AB in FIG. Here, the vector OA is the traveling speed V1, the vector OB is the cutting speed V2, and the angle β formed by the vector AB with respect to the vector OA is referred to as the cutting angle. In the drawings, the angles are greatly enlarged for easy viewing, but the actual angles are as small as 0.1 to 0.2 degrees as described above.

  The trimmer round blade 2 is given a toe-in angle α with respect to the traveling direction of the steel strip 1, but the traveling direction of the steel sheet 1 as viewed from the trimmer round blade 2 changes by the cut angle β. The toe-in angle, that is, the toe-in angle with respect to the cutting angle β is α−β, and the magnitude thereof varies depending on the cutting speed V2. FIG. 4 shows the case where the cutting speed V2 is small and the toe-in angle α-β is positive with respect to the cutting angle β, and FIG. 5 shows the case where the cutting speed V2 is large and the toe-in angle α-β is negative with respect to the cutting angle β. ing.

  In the present invention, the trimmer round blade 2 is cut while maintaining the toe-in angle α-β in the range of +0.08 to + 0.115 ° with respect to the cut angle β. If this angle is less than 0.08 °, cutting cannot be performed, resulting in poor trim. Even if this angle exceeds 0.115 °, the trimmer round blade 2 cannot be cut. FIG. 6 shows the above relationship under the conditions of a toe-in angle α = 0.146 °, V1 = 150 mpm, and a plate thickness of 0.1 to 0.4 mm. The upper part of FIG. 6 shows the cutting speed V2, and the lower part shows the toe-in angle α-β with respect to the cutting angle β at that time. The cutting speed V2 = 0 means a steady trimming state.

  As indicated by the circles in FIG. 6, good results are obtained when the toe-in angle α-β with respect to the cutting angle β is set to +0.08 to 0.115 °. The difference between the circumferential speed and the running speed V1 of the metal strip (referred to as trimmer round blade lead rate in Table 6) is preferably 30 to 50 mpm. If this difference is less than 30 mpm, the cutting is not performed smoothly, resulting in a trim failure (indicated by x), and if it exceeds 50 mpm, the trim cross section becomes rough, and it is easy to cause a trim failure. Therefore, the best result can be obtained when the angle α-β is set to +0.08 to 0.115 ° and the cutting peripheral speed of the trimmer round blade 2 is made 30 to 50 mpm larger than the traveling speed V1 of the metal strip. .

  The above description has been made with respect to the cutting process. However, when the trimmer round blade 2 is retracted to the outside at the end of trimming, it can be smoothly performed if the above conditions are observed.

  As described above, according to the present invention, the trimmer round blade can be surely cut into the edge of the metal strip as it is even when the metal strip thickness is 0.4 mm or less and the high-speed passing plate exceeds 100 m / min. Therefore, trimming can be automated, and it is not necessary to stop the line or reduce the line speed at the start of trimming, thereby improving productivity.

It is a perspective view explaining the state which stops the conventional line and starts trimming. It is a perspective view explaining the state which starts a notch while running without stopping a line. It is a top view which shows the relationship between a steel strip and a trimmer round blade. It is a vector diagram when the cutting speed is low. It is a vector diagram when the cutting speed is large. It is a graph which shows the cutting condition and its quality.

Explanation of symbols

1 Steel strip 2 Trimmer round blade α Toe-in angle β Cutting angle V1 Traveling speed V2 Cutting speed

Claims (2)

A trimmer round blade fixed with a predetermined toe-in angle α with respect to the traveling direction of a metal strip having a thickness of 0.1 to 0.4 mm, and the trimmer round blade is traveling at a plate speed exceeding 100 mpm . A method of cutting into the edge of the metal strip, wherein the toe-in angle α-β of the trimmer round blade with respect to the cut angle β determined by the traveling speed of the metal strip and the cutting speed of the trimmer round blade is +0.08 to A trimmer running cutting method characterized by moving the trimmer round blade at a cutting speed maintained in a range of 0.115 °.   The trimmer running cutting method according to claim 1, wherein a cutting peripheral speed of the trimmer round blade is set to be 30 to 50 mpm larger than a running speed of the metal strip.

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