JP5441215B2 - Metal strip edge processing method and edge processing roll - Google Patents

Description

  The present invention relates to a method for making a corner and a burr generated by cutting and shearing a thin steel sheet and other metal thin plates into an end surface without a corner and a burr using a roll, and a roll used therefor.

For example, a wide metal strip 1 that has been cold-rolled, such as a cold-rolled steel sheet, is slit to a predetermined width by a slitter 2 (see FIG. 1), and unnecessary ends are removed to provide various uses. .
When the metal strip is sheared by a slitter, as shown in FIG. 1, sharp burrs 3 and corners 4 are generated at both side edge portions in the entire longitudinal direction. These burrs and corners (hereinafter referred to as “burrs” including the corners) are dangerous if they can be touched with bare hands. In addition, in a product in a usage form in contact with a soft material such as rubber or resin, the burr damages or breaks the rubber or resin, thereby causing a reduction in function or destruction of the product. Further, for example, in an electromagnetic steel sheet, burrs also cause the laminated iron core to be electrically short-circuited and cause a decrease in magnetic properties.

For this reason, the development of a shearing method that suppresses the generation of burrs themselves, and the removal of burrs by performing post-processing such as grinding or roll forming with a grinder or the like on the side end after slitting are performed.
For example, Patent Document 1 proposes a shearing method that does not generate burrs, in which a metal band to be sheared is not separated by one-stage shear deformation, but is separated by two-stage shear deformation in opposite directions. .
Patent Document 2 proposes a method in which a roll provided with a groove is pressed from the width direction to process an edge portion to eliminate burrs and corners.
Furthermore, Patent Document 3 proposes a method of crushing burrs by providing a pair of side rolls with a groove having a width equal to the plate thickness.

Japanese Patent No. 2857287 Japanese Patent Laid-Open No. 7-251224 JP 2006-136894 A

However, even if shearing is performed by the means proposed in Patent Document 1, corners are generated on the shear end face depending on the material properties and thickness of the material, and the product is in contact with rubber or resin. If used, the problem of wrinkling the rubber or resin cannot be solved.
Further, the method proposed in Patent Document 2 is a method of using four stands instead of two stands, and rolling down in the width direction with the left and right side rolls while restraining with the rolls from above and below. In this method, as shown in FIG. 2, the tension on the left and right of the metal band changes due to the parallelism of the upper and lower restraining rolls and the difference in the thickness between the left and right of the metal band, causing meandering and shifting. May not be crushed properly, the lowering force of the upper and lower restraining rolls applied to the metal strip must be made uniform, and the pressure adjustment of the upper and lower rolls becomes very difficult. Therefore, an apparatus for equalizing the pressure of the restraining roll is required, which is rather expensive.
A method of attaching the guide roll 5 to prevent meandering is also conceivable. However, when the metal band is thin, as shown in FIG. 3, the guide roll will bend in the thickness direction. Is not a good idea.

In the method proposed in Patent Document 3, as shown in FIG. 4, the metal band is constrained by the groove formed in the side roll, so even if the width of the side roll is reduced by the side roll in order to crush the burr. The bending in the plate thickness direction is difficult to occur.
However, even in this method, in the case of a thin metal band, bending occurs in the plate thickness direction in the region P with less restraint on the side roll entrance side. In addition, when the reduction in the width direction is strong, if the plate thickness shape in the width direction is not uniform, as shown in FIG. 5, the amount of processing changes depending on the left and right variations of the metal band, and the metal bite due to the biting C into the groove There is a risk that problems such as lateral bending of the belt or burrs on only one side may be crushed.

  The present invention has been devised to solve such a problem, and the burrs and corners formed on the side end face of the metal band sheared by the slitter are bent or buckled in the metal plate itself. It is an object of the present invention to provide a method for efficiently crushing to an edge end face shape without burrs or corners.

In order to achieve the object, the metal band edge processing method of the present invention has a large length that prevents the buckling from occurring in the plate thickness direction by a load that is reduced in the plate width direction. A constraining roll provided with a groove having a width wider than the plate thickness and a processing roll provided with a groove having a diameter smaller than that of the roll and wider than the plate thickness. The burrs and corners formed at the time of slitting are crushed by rolling down both side edge portions of the metal strip in the longitudinal direction through the gap between the grooves of a pair of rolls.
Furthermore, if the gap between the second pair of rolls with the constraining roll and the processing roll being reversed is passed, the burrs and corners of the both edge portions of the slit metal band are crushed beautifully.

  The edge treatment roll for carrying out the above method is as follows: When the metal strip slit by a slitter is passed through a pair of grooved rolls, the both side edges of the plate in the longitudinal direction of the metal strip are pressed down in the plate width direction. In the edge treatment roll of the metal band that crushes the formed burrs and corners, it has a large diameter and a depth at which the width of the plate protrudes in the thickness direction so that it does not buckle in the thickness direction due to the load that is rolled down The restraint roll is provided with a groove having a width wider than the plate thickness, and the processing roll is provided with a groove having a diameter smaller than that of the roll and wider than the plate thickness.

  According to the present invention, the burrs and corners formed at both edge portions of the slit metal strip have a large diameter and a length that does not cause buckling in the plate thickness direction due to a load that is reduced in the plate width direction. A constraining roll provided with a groove wider than the plate thickness, and a processing roll provided with a groove having a diameter smaller than that of the constraining roll and wider than the plate thickness. This is eliminated by crushing between a pair of rolls. In order to remove the burrs and corners of the edge with a small diameter processing roll while reliably preventing buckling in the thickness direction with a large diameter constraining roll, a thin metal strip is formed by a simple method. An edge end face shape without burrs or corners can be easily obtained over the entire longitudinal direction.

The figure explaining the generation | occurrence | production state of the burr | flash and a corner at the time of slitting the metal strip 1 The figure explaining the problem of the method proposed by patent document 2 Diagram explaining the meandering prevention method Diagram explaining the occurrence of bending at the center of the plate width A diagram for explaining the occurrence of lateral bending due to biting into the groove at the plate width end The figure which illustrates this invention method roughly The figure explaining the preferable aspect (the 1) of the method of this invention The figure explaining the preferable aspect (the 2) of the method of this invention The figure used in order to explain the calculation method of length l which does not buckle in an example

The present inventors have made various studies on measures for eliminating burrs and corners that are formed or introduced when a thin metal plate is slit.
First, in order to crush the burr, a pair of V-shaped grooved rolls having the same roll diameter and groove dimensions were installed. However, if both sides of the metal strip are reduced in the width direction by a side roll provided with V-shaped grooves, bending occurs in the thickness direction of the metal strip. Therefore, as shown in FIG. 6, the pair of rolls has a large diameter and a depth at which the width of the sheet protrudes with a length that does not buckle in the thickness direction due to a load that is reduced in the width direction. The constraining roll provided with a U-shaped groove wider than the width, and the other roll having a V-shaped groove slightly smaller than the plate thickness and having a roll diameter smaller than that of the constraining roll. Was used.

  By appropriately adjusting the distance between the pair of rolls and passing a metal strip through the groove of each roll, the burr is crushed on the processing roll side provided with the V-shaped groove, The bending in the thickness direction is restrained while receiving the force of the reduction in the width direction. The groove depth of the constraining roll can be obtained by calculating a simple buckling strength based on the rolling load, or by analysis such as a finite element method. The depth of the constraining roll groove must be deep enough to protrude the width of the sheet so that buckling does not occur in the sheet thickness direction due to the load rolling down in the sheet width direction. Therefore, it is preferable that the depth is as deep as possible. Further, since the groove width restrains the bending in the plate thickness direction, it is preferable that the groove has only a width that allows the metal strip to enter the groove.

By processing in this way, the metal band restraining region when the metal band is crushed in the width direction is wide, that is, the region P with little restraint in FIG. Can be prevented. Also, because the restraint area is wide and the metal band is firmly supported, the force of width reduction by the V-groove is not used for buckling of the metal band, but only for crushing burrs or corners. Can be small. In addition, since the V groove is only in contact with the corner of the metal band and the load under the width can be reduced, it is possible to prevent the metal band from biting into the groove and to prevent the metal band from bending sideways. is there.
By the way, since only one pair of rolls is crushed on one side of the metal strip, bending in the width direction may occur due to variations in the processing amount on the left and right of the metal strip. At this time, as shown in FIG. 7, it passes through each groove of the second-stage side roll (II in FIG. 7), which is reverse to the first-stage (I in FIG. 7), and on both sides. The occurrence of lateral bending can be prevented by crushing burrs.

Next, a more preferable aspect of the present invention will be described.
The wide cold-rolled metal plate is slit to a predetermined width by a slitter, and multiple metal strips are discharged simultaneously. Therefore, in order to eliminate the corners and burrs of the edge of the slit metal strip efficiently or at low cost, the metal strips slit into a plurality of strips are not used one by one, but by the number of slits simultaneously. It is considered good to roll down with a roll.

  The present inventors also disclosed in Japanese Patent Application Laid-Open No. 2006-281227 a plurality of narrow metal bands in which respective end faces are arranged adjacent to each other following the step of slitting the metal bands into a plurality of narrow metal bands. A plurality of narrow metal strips are arranged so that one end thereof is aligned on the same plane by twisting each of them at an angle of 90 degrees around an axis parallel to the longitudinal direction. Proposes to apply round processing to both end faces of multiple narrow metal strips at the same time.

In the present invention, it is basically preferable to use the above method. However, in the present invention, the burrs of the metal band are crushed by the side rolls on each side, so that two pairs of I and II are installed in order to reliably eliminate burrs and corners on both sides.
The slit metal plate is twisted 90 degrees, and in the first stage, a pair of processing rolls provided with V-shaped grooves for crushing burrs on the end face are provided on one side, and the other side is provided with the other side. Width enough to allow the metal strip to enter the groove with a length that does not cause buckling in the plate thickness direction due to a load that rolls down in the plate width direction, and deep enough that the burr can be crushed in the V groove. The bending in the plate thickness direction is restrained while receiving the force of the reduction in the width direction by the restraining roll provided with the U-groove having only the number of slits.
In the second stage, since the opposite side of the first stage is crushed, the pair of side rolls in the first stage are installed in the opposite direction.
As described above, by appropriately adjusting the distance between the side rolls installed in the above two stages and letting the metal band pass through, even a thin metal band can be crushed without bending in the plate thickness direction. .

In order to crush the burrs on both ends of the steel plate slit to a plate width of 7 mm and a plate thickness of 0.4 mm with SUS430, the plate was passed through a stand of a pair of rolls with a restraining roll and a processing roll with a rolling force of 50 kgf.
The first pair of rolls are a processing roll provided with a V-shaped groove having a roll diameter of 50 mm and a depth of 30 mm and a depth of 1 mm, and a U roll having a roll diameter of 60 mm, a depth of 6 mm, and a width of 0.430 mm. A restraining roll provided with a mold groove was installed. As for the groove depth of the restraining roll, the maximum length that does not buckle with the 50 kgf rolling force that is considered necessary for actual crushing is 1.5 mm, which is obtained by simple calculation. Then, the projection length in the plate width direction from the groove was set to 6 mm so as to be 1.0 mm.

As for the distance between the rolls, a steel strip was put in the groove, and the plate was passed in a state of 0.1 mm width reduction after the steel strip contacted the roll having the V-shaped groove. Thereby, the burr | flash of the side which was contacting the V-shaped groove | channel of a steel strip is crushed. As with the first stage, the second stage is a pair of a processing roll provided with a V-shaped groove on one side and a restraining roll provided with a U-shaped groove containing a steel strip. A roll is installed and a steel strip is passed through so that the side where the V-shaped groove is not in contact is in contact with the V-shaped groove in the second stage.
Thereby, the end surface without a burr | flash could be obtained in the whole longitudinal direction of a steel strip, without buckling generate | occur | producing.

Note that the non-buckling length l calculated in the above embodiment is obtained from the following (Equation 1) and (Equation 2) when W, b, h, and l are as shown in FIG. It is.
W = n · π ^{2 ·} E · I / l ² (Formula 1)
^{I = b · h 3/12} ( Equation 2)
However,
W: load, n: constant (1/4 for free end), E: elastic modulus (2.1 × 10 ⁴ kg / mm ² ),
I: Section moment of inertia, l: Length without buckling, b: Length of roll contact in the longitudinal direction (assuming that it is almost point contact, equivalent to plate thickness), h: Plate thickness

Claims (3)

  A metal strip slit by a slitter has a large diameter and a depth at which the width of the sheet projects so as not to buckle in the sheet thickness direction due to a load that is reduced in the sheet width direction. The width is wider than the sheet thickness. A constraining roll provided with a groove, and a whole area in the longitudinal direction of the metal band passing between both grooves of a pair of rolls made of a processing roll provided with a groove having a diameter smaller than the roll and wider than the plate thickness. An edge treatment method for a metal strip, characterized by crushing burrs and corners formed at the time of slitting by rolling down both side edge portions in the plate width direction.   Furthermore, the edge processing method of the metal strip of Claim 1 which passes between both the grooves of the 2nd pair roll which made the position of the restraint roll and the process roll reverse.   The metal band edge that crushes burrs and corners formed at the time of slitting by rolling the metal band slitted by a slitter between the pair of grooved rolls in the plate width direction on both sides of the plate in the longitudinal direction of the metal band. In the processing roll, a groove having a large diameter and a width that is wider than the plate thickness is provided at a depth at which the plate width of the length that does not buckle in the plate thickness direction with a load that is reduced in the plate width direction protrudes. An edge treatment roll for a metal band, comprising a restraining roll and a processing roll provided with a groove having a diameter smaller than that of the roll and wider than a plate thickness.

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