JPH0417292Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention continuously shears both edges of a steel strip,
This invention relates to a rotating round blade for shearing a pair of upper and lower steel strips to finish them to a predetermined width.

Conventional technology Generally, in order to finish a cold-rolled thin steel strip or pickled steel strip to a specified width, both edges of the steel strip are sheared using a shearing machine. However, if the steel strip is thin, it will easily deflect, warp, or bend, which will reduce the width dimension accuracy of the steel strip after shearing, and the steel strip will be tilted at right angles to the shearing blade, furthermore, during shearing. The resulting vibrations caused inconveniences such as ear scratches on the edges of the steel strip. Therefore, in order to solve these problems, in the past, a presser roller was placed in contact with the steel strip from both sides just before the edge shearing machine, and the rollers corrected the warpage and bending of the steel strip. In addition, a method has been adopted in which the steel strip is held perpendicular to the blades of a shearing machine to suppress vibrations that occur during shearing. However, in such a method, it is necessary to set the axial length of the presser roller at a predetermined ratio to the width of the steel strip. There were inconveniences such as the need to prepare various presser rollers.

Another method is to pull the steel strip in its width direction by placing the steel strip facing both edges of the steel strip upstream of the side edge shearing machine to which the steel strip that shears the side edges of the steel strip is fed. Steel strip shearing device equipped with magnets (1987-
No. 40313) has been proposed.

However, with this device, the sheared edge waste after shearing the edge of the steel strip becomes completely tensionless, making it difficult to apply sufficient tension in the strip width direction just before shearing the steel strip, resulting in poor flatness and edge elongation. For steel strips such as wood, there were problems such as ear scratches occurring on the side edges of the steel strip.

As yet another method, one or both of the circumferential surface and the shearing side surface of a rotary shearing blade that continuously shears the steel strip is cut so that at least the vicinity of the shearing periphery is inward from the shearing periphery or the immediate vicinity thereof. A rotary round blade for shearing steel strips that is inclined to
-128816), which has an inwardly inclined slope on the circumferential surface of the rotary round blade, which reduces the bending moment generated on the steel plate surface in contact with the circumferential surface, and maintains a good sheared surface shape. This is a great way to do it. However, in recent years, there has been a demand for better and more efficient shearing performance in addition to the shape of the shearing surface, and even the above-mentioned shearing equipment has a limit in its throughput.

Problems to be solved by this invention This invention prevents the occurrence of vertical shear scratches on the sheared surface of the steel strip, maintains a good shape of the sheared surface of the steel strip, and improves shearing efficiency. It is intended to provide a round blade.

Means for Solving the Problems In order to solve the above problems, the present invention provides an inclined surface on the outer peripheral surface of the rotary round blade for shearing, which has a small diameter that slopes from the shearing periphery toward the center of the blade width (thickness direction). , a groove for embedding the magnet is drilled on the inclined surface,
A magnet is embedded to apply tension in the width direction of the steel strip for shearing, and the sheared shearing stubs 21 are also attracted to the rotary round blade for shearing (hereinafter simply referred to as the rotary round blade) by the magnet and sheared. This prevents sagging, burrs, and scratches from occurring on the sheared surface of the steel strip.

Function: The rotary round blade for shearing the side edge of a steel strip according to this invention has an outer circumferential surface that is inclined so that the diameter becomes smaller from the vicinity of the outer peripheral edge toward the center of the blade width of the rotary round blade. A magnet is embedded in the inclined surface, and this magnet attracts the steel strip to be sheared in the width direction, bending the steel strip in the width direction, suppressing the vibration of the steel strip during shearing, and suppressing the steel strip and the rotating circle. By making the blades perpendicular to each other, a good shearing surface shape can be achieved.Furthermore, the sheared lug debris is attracted by the magnet embedded in the rotating round blade, forcing it in the direction opposite to the shearing direction (rotating round blade). Since bending force is applied in the lateral upward direction, shearing is performed with a mild shearing force, which has the effect of extending the life of the rotary round blade and improving shearing efficiency.

Embodiment An embodiment of this invention will be described below based on the drawings.

As shown in Fig. 1, this invention consists of a pair of upper and lower rotary round blades 1a and 1b for shearing the side edges of a steel strip. A magnet 3 is embedded in the outer peripheral surface, and the inner side surface 7 is closer to the shearing outer peripheral edge 6 of the rotary round blade 1a.
A part of the inclined surface is inclined inward, and the outer peripheral surface is provided with an inclined surface 9 whose diameter becomes smaller from the vicinity of the outer peripheral edge 6 of the shearing blade toward the blade width direction (the center of the blade width) of the rotary round blade 1a. The angle of inclination is 1 degree to 60 degrees, preferably 20 degrees
It is about degree.

During shearing, the shearing properties of the portion that will become the sheared selvedge 21 are improved when the shearing direction is inclined in the opposite direction rather than in a flat state.

However, if this angle of inclination becomes larger than 60 degrees, the distance between the magnet 3 and the sheared ear scraps 21 is too far, and the magnet 3
The angle should be less than 60 degrees, as it will be difficult to adsorb.
A fitting groove 8 for embedding the magnet 3 is provided in this inclined surface 9, and the magnet 3 is embedded in the fitting groove 8. As shown in FIG. The piece 5 is provided with a notch 11 on one end side of the outer peripheral surface in the circumferential direction and a protrusion 10 on the other end side, and has a structure in which the notch 11 and the protrusion 10 of the arcuate pieces 5 overlap, and this arc A long hole 12 into which a screw is inserted is bored in the protrusion 10 of the piece, and a screw hole 13 that engages with the long hole 12 is provided in one notch 11, respectively. The elongated hole 12 is designed to fit an adjustable screw 4 to match the outer diameter of the rotary round blade 1a when the arcuate pieces 5 of the magnet 3 are attached to the outer peripheral surface of the rotary round blade 1a and buried therein. .

As mentioned above, the rotary round blade 1a for shearing the steel strip 2 (in the case of this invention, the upper blade is used in a commonly used method) has an inclined surface 9 on the outer peripheral surface, and a magnet is attached to this inclined surface 9. 3 (in this case, a plurality of circular arc pieces) are attached to the fitting groove 8 of the inclined surface 9 of the rotary round blade 1a to form a rotary round blade for shearing.

Using this rotary round blade for shearing, thin steel strips with a thickness of 0.5 mm can be cut.
When shearing a steel strip with a width of 1200 mm, conventional shearing allowances (edge allowances) of 3 to 6 mm were required, but with this invention, only 1 to 2 mm of shearing allowance is required, and the shearing speed is also lower than that of conventional methods.
The rotary round blade for shearing of this invention was able to shear at a high speed of 340 m/min, whereas the cutting speed was 270 m/min, and the width dimension accuracy was improved and no ear scratches were observed.

In the explanation of this invention, the magnet 3 embedded in the outer peripheral surface of the rotary round blade 1a was explained as a plurality of circular arc pieces, but the magnet 3 does not necessarily have to be a divided circular arc piece, as shown in FIG. The rotary round blade 1a is divided into two parts A and B in the blade width direction, and the embedded magnet 3 is formed into a ring shape.The rotary round blade 1a is fitted into the magnet fitting grooves 8 of A and B of the rotary round blade 1a, and the bolt 14 is used to divide it into two parts. The same effect can be obtained by combining A and B of the rotary round blade 1a and clamping and fixing the magnet 3 thereto as a rotary round blade for shearing.

Furthermore, although the explanation has been made as a rotary round blade having shearing blades on both sides of the outer peripheral surface of the rotary round blade, it is also possible to use a rotary round blade having shearing blades on only one side edge of the rotary round blade outer peripheral surface. Not even.

Effects of the invention As described above, this invention has great effects on improving efficiency and quality, such as improving the shear rate during continuous shearing of the side edges of the steel strip and preventing the occurrence of flaws on the sheared surface. It has the following.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of the steel strip shearing situation using the rotary round blade for steel strip shearing of this invention.
The figure is a side view, the B figure is a cross-sectional view taken along the - line of A figure,
Fig. 2A is a partial cross-sectional view showing the state when the arc piece magnet according to this invention is assembled into a rotating round blade, Fig. 2B is a perspective view of the arc piece magnet, and Fig. 3 is this invention. Figure A is a side view of another embodiment of the rotary round blade for shearing, and Figure B is a cross-sectional view taken along the - line. In the figure, 1a and 1b are rotary round blades, 2 is a steel band, 3 is a magnet, 4 is a magnet fastening screw, 5 is a circular arc piece, 6 is an outer periphery of a shearing blade, 7 is an inner side surface, 8 is a fitting groove, 9 is an inclined surface, 10 is a protrusion, 11 is a notch, 12 is a long hole,
13 is a screw hole, 14 is a bolt, and 21 is a sheared lug.

Claims (1)

[Scope of utility model registration request] In a pair of upper and lower rotating round blades that continuously shear the steel strip side edge, a shearing blade part is provided on one or both of the side edges of the outer peripheral surface of the rotating round blade, and from the side edge of the shearing blade part,
A sloped surface with an angle of 1 to 60 degrees is formed with a small diameter toward the center of the blade width of the round blade, and a fitting groove for embedding the magnet with a width smaller than the width of the round blade is bored in the sloped surface. A rotating round blade for shearing steel strips featuring a magnet embedded in the groove.