JPH04354612A - Side trimming for soft thin steel plate - Google Patents

Abstract

PURPOSE:To carry out the ordinary trimming where a cut part is perfectly separated and the burr-free trimming where the uncut part is left, free from the generation of the trouble such as buckling of a thin steel plate. CONSTITUTION:A side trimmer which is constituted so that the axes of the round shear cutter 3 and 4 can be tilted in a horizontal plane is used, and in the ordinary trimming where a cut part is perfectly separated, the axes of the round shear cutters 3 and 4 are tilted so that the center side in the plate width direction is directed to the advance direction of a steel plate, while in the burr-free trimming where an uncut part is left in the cut part, side trimming is carried out, by setting the axes of the round shear cutters perpendicular to the steel plate advance direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for side trimming thin steel sheets, and more particularly to a method for side trimming soft thin steel sheets.

0002

2. Description of the Related Art Side trimming is performed to remove defects on both edges of a thin steel plate or to make the width of the plate uniform. This side trimming is performed using a side trimmer equipped with a pair of upper and lower shearing round blades on the left and right sides of the steel plate traveling direction, but usually the upper and lower shearing round blades are overlapped as shown in Japanese Patent Application Laid-Open No. 62-213916. Trim so that the cut part is completely separated, that is, the scrap is completely separated. This state is shown in Figure 4 (
A) shows only one side of the thin steel plate 1. 2 is the cut scrap, 3 is the upper blade of the shearing round blade, and 4 is the lower blade.

However, if the cut portion is completely separated in this way, burrs will occur on the edge of the plate after trimming, so if burrs are particularly objectionable in subsequent processes, for example, Japanese Patent Laid-Open No. 62-282811 discloses A burrless trimming method as shown is employed. The state of this cutting part is shown in FIG. 4(B), and an example of the trimming equipment is shown in FIG. In FIG. 4(B), the cut portion is not completely separated, and an incision is made leaving an uncut portion Y. In this case, it is said that the appropriate pushing amount α of the cutter is 60 to 80% of the plate thickness t.

As shown in FIG. 3, the side trimmer 1
The scrap 2 is separated from the thin steel plate by clamping the cut portion from above and below using a clamping pressure roller 11 installed on the exit side of the scrap 2. Note that 5 shown in FIG. 3 is a guide plate for the scrap 2, and 6 is a scrap borer for winding up the scrap 2.

[0005]

[Problems to be Solved by the Invention] However, when performing normal trimming that completely separates the cut portion as described above, buckling may occur in thin steel plates and trimming may not be possible. This tendency is particularly strong in soft thin steel sheets such as low carbon steel and ultra-low carbon steel, and buckling is more likely to occur as the line speed increases.
At high speeds exceeding 50 m/min, most soft thin steel plates of 0.6 mm or less could not be trimmed. Figure 2
shows the rate of occurrence of buckling for each plate thickness, and it can be seen that buckling hardly occurs in steel plates with a thickness of 0.7 mm or more, but begins to occur rapidly when the thickness becomes 0.6 mm or less. Note that the line speed in this case is 45
The speed was 0 m/min.

Furthermore, even if this buckling prevention measure was directly applied to burrless trimming, a sufficient effect could not be obtained because the cutting method was different. The present invention provides a side trimming method for a soft thin steel sheet that does not cause any trouble, even when performing normal trimming that completely separates the cut portion, or performing burrless trimming that leaves an uncut portion at the cut portion. The purpose is to provide

[0007]

[Means for Solving the Problems] A method for side trimming a soft thin steel plate according to the present invention uses a side trimmer equipped with a pair of upper and lower shearing round blades on the left and right sides of the steel plate traveling direction, the axis of which can be tilted in a horizontal plane. A method for side trimming a soft thin steel plate, in which the axes of the left and right shearing round blades are tilted so that the center side in the width direction of the steel plate is tilted in the direction of movement of the steel plate during normal trimming to completely separate the cut part, During burrless trimming, which leaves an uncut portion at the cut portion, the above-mentioned problems of the conventional technology are solved by performing trimming with the axis of the shearing round blade perpendicular to the traveling direction of the steel plate. Trimming performed by tilting the axis of the shearing round blade during normal trimming to completely separate the 0
．． By applying it to steel plates with a thickness of 6 mm or less, the life of the shearing round blade can be maintained.

[0008]

[Operation] During normal trimming to completely separate the cut portion, trimming is performed by tilting the axis of the shearing round blade so that the center side in the width direction of the steel plate is inclined in the direction of movement of the steel plate. By inclining the axis of the round shearing blade in this manner, a component force directed outward is generated on the steel plate, thereby preventing buckling.

[0009] Furthermore, when trimming performed by tilting the axis of the shearing round blade is applied to burrless trimming that leaves an uncut part in the cut part, ear waves may be generated inside the cut part (product side). There is. This is thought to be because the cutting part is pushed by the side surface of the upper shearing round blade (upper blade). Therefore, in the present invention, during burrless trimming that leaves an uncut portion at the cut portion, trimming is performed with the axis of the shearing round blade perpendicular to the traveling direction of the steel plate without inclining it. It has also been found that in this case, the occurrence of buckling is prevented because the steel plate is restrained by the lower shearing round blade (lower blade) through the scrap.

As described above, the method for side trimming a soft thin steel sheet according to the present invention makes it possible to perform trimming while suppressing the occurrence of buckling and ear waves, whether in normal trimming or trimming without burrs. Furthermore, during normal trimming to completely separate the cut section, trimming performed by tilting the axis of the shearing round blade can be applied to all soft thin steel plates to be processed, but as mentioned above, Buckling rarely occurs in steel plates with a thickness of 0.6 mm or more, and the cutting edge of the round shear blade is likely to be damaged if applied to steel plates that are too thick, so it is desirable to apply it to steel plates with a thickness of 0.6 mm or less.

[0011]

EXAMPLE A method for side trimming a soft thin steel plate according to the present invention will be explained with reference to FIG. Note that the equipment configuration of the side trimmer in this case is the same as that shown in Figure 3 above, but the side trimmer 10 is one in which the axis of the shearing round blade can be tilted in a horizontal plane, and the part immediately adjacent to the exit side is not shown. There is a scrap processing facility.

First, FIG. 1(A) shows a case where trimming is performed to completely separate the cut portion as shown in FIG. 4(A). It is tilted in a horizontal plane so that the center side faces the direction of movement of the steel plate (arrow). By inclining the axis of the shearing round blade in this manner, an outward component force is generated on the steel plate 1, and buckling does not occur even in a thin steel plate.

[0013] In this case, the inclination angle θ is 0.1°~
It is about 0.4°, preferably about 0.2°. Next, as shown in FIG. 4(B), FIG. 1(B) shows a case in which burrless trimming is performed to leave an uncut portion at the cut portion, and the axes of the upper and lower shearing round blades 3 and 4 on both the left and right sides are centered on the progress of the steel plate 1. It is perpendicular to the direction. In this case, the steel plate 1 is passed through the scrap 2 to the lower blade 4.
Buckling does not occur because it is restrained by

[0014] The present invention has a plate thickness of 0.23 mm to 1.8 mm.
, applied to ultra-low carbon steel sheets with a sheet width of 915 mm to 1850 mm. The line speed in this case is 450 m/min, and trimming without burrs is performed on a steel plate of 0.4 mm or more, and trimming that completely separates the cut part by tilting the axis of the shearing round blade is 0.6 mm or less. The test was conducted on steel plates. As a result, there is no buckling during trimming that completely separates the cut section, and no ear waves during burrless trimming that leaves uncut sections at the cut section, and the lifespan of the shearing round blade is almost the same as before. Nothing changed.

[0015]

Effects of the Invention The method for side trimming a soft thin steel sheet according to the present invention eliminates the occurrence of buckling in normal trimming that completely separates the cut portion, and the occurrence of ear waves in burrless trimming that leaves an uncut portion in the cut portion. It is possible to completely eliminate the occurrence of trimming, which greatly contributes to maintaining product quality after trimming. Furthermore, by limiting the target plate thickness when tilting the axis of the shearing round blade, there is an advantage that the life of the shearing round blade can be maintained at almost the same level as before.

[Brief explanation of drawings]

FIG. 1 is a plan view for explaining the side trimming method for a soft thin steel plate according to the present invention.

FIG. 2 is a drawing showing the incidence of buckling in comparison with the plate thickness during normal trimming to completely separate the cut portion.

FIG. 3 is an explanatory diagram of an equipment arrangement for performing burrless trimming.

FIG. 4 is an explanatory diagram of a cutting section by trimming.

[Explanation of symbols]

1 Thin steel plate 2 Scrap 3 Upper shear round blade 4 Lower shear round blade 5 Guide plate 6 Scrap Bora 10 Side trimmer 11 Clamping pressure roller

Claims (2)

[Claims] 1. A method for side trimming a soft thin steel plate using a side trimmer equipped with a pair of upper and lower shearing round blades on the left and right sides of the steel plate traveling direction, the axis of which can be tilted in a horizontal plane, During normal trimming, the axes of the left and right shearing round blades are tilted so that the center side in the width direction of the steel plate is tilted toward the advancing direction of the steel plate, and during burrless trimming, the left and right shearing blades are A method for side trimming a soft thin steel sheet, characterized by performing side trimming with the axis of a round blade perpendicular to the direction of travel of the steel sheet. 2. The method according to claim 1, wherein the trimming performed by tilting the axis of the round shear blade during normal trimming to completely separate the cut portion is applied to a steel plate having a thickness of 0.6 mm or less. Side trimming method for soft thin steel plate.