JP6801689B2 - Coil opener equipment and metal strip opening method using coil opener equipment - Google Patents

Description

The present invention uses a coil opener facility for opening a metal strip used on the entrance side of a metal strip supply line in an electric sewing pipe production line, a pickling line, a shear line, a rolling line, etc., and this coil opener facility. It relates to a method of opening a metal band.

Coil opening is one of the operations of opening the tip of a metal band (hereinafter, simply referred to as a coil) wound into a coil. Normally, since the coil tip portion of the coil supplied to the line is in close contact with the outer circumference of the coil, the coil is intermittently sent to the coil opener in order to open the coil tip portion as needed.

The coil opener equipment conventionally used and the coil opening using the coil opener equipment will be described with reference to FIG.

FIG. 1A is a side view of the coil opener equipment as viewed from the side, and specifically, is a side view of the opener arm constituting the coil opener equipment as viewed from the side.

As shown in FIG. 1B, the tip 2 of the opener arm 1 is brought into contact with the outer circumference of the coil S by the cylinder 3 in accordance with the diameter of the coil S. Next, as shown in FIG. 1C, the coil S mounted on the cradle roll 4 is rotated to open the tip of the coil.

FIG. 2 is a perspective view of the shape of the tip of the opener arm 1 as viewed from above. As shown in FIG. 2, the contact surface with the coil S has a linear shape.

When the tip of the coil is opened, the tip of the opener arm comes into direct contact with the outer circumference of the coil, so the outer circumference of the coil and the tip of the opener arm slide due to the adhesion of the tip of the coil, causing flaws in the outer circumference of the coil and yield. There is a problem of lowering.

As a method for preventing such a flaw that occurs when the tip of the coil is opened, for example, in Patent Document 1, the shape of the end of the coil is corrected in advance in the previous step, and the flaw due to sliding at the end is opened. A method of suppressing the occurrence is disclosed.

Further, as another measure, a method of using a material having a low hardness such as resin as the material of the tip of the opener arm is also generally used.

Japanese Unexamined Patent Publication No. 7-284851

In the method described in Patent Document 1, it is necessary to introduce equipment for shape correction in the pre-process, which requires a large initial cost and labor for pretreatment.

In addition, in the measures to use a material with low hardness for the tip of the opener arm, the tip is severely worn and the running cost is increased, and the load is greatly cracked when opening a thick material. There are issues such as.

The present invention has been made in view of the above problems, and provides a coil opener facility and a coil opener facility that are simple and capable of suppressing the occurrence of flaws on the outer periphery of the coil when the coil is opened. It is an object of the present invention to provide a method for opening a metal band used.

In order to solve the above problems, the present inventors have focused on the displacement of the coil tip in the width direction when the coil is opened.

Table 1 shows the measured values of the displacement (C warp amount) in the width direction of the coil tip before and after the opening of the coil, and Table 2 shows the theoretical values (of the C warp amount) calculated from the saddle bending theory in strength of materials. Shown. The stress measurement is an actually measured value when an external force is applied to a position on the inner peripheral side of 1000 mm from the tip of the coil to open the coil. The center is the position of the center in the coil width direction.

As can be seen from Tables 1 and 2, when the coil is opened, the coil tip is deformed in the width direction, and the coil tip is C-warped in the width direction. As a result, when the coil is opened, the stress acting from the tip of the coil to the tip of the opener arm has a distribution in the width direction.

Therefore, when opening a thick material having a large load at the time of opening, the stress at the edge portion at the coil tip portion required at the time of opening becomes high, and as a result, coil outer peripheral flaws occur at the edge portion of the coil.

Next, Table 3 shows the results of the stress distribution in the width direction of the tip of the opener arm when the coil is opened. The stress is measured by a strain gauge attached to the back surface side (the side indicated by the arrow A in FIG. 2) of the tip portion of the opener arm at a pitch of 100 mm from the center (center) in the width direction of the coil toward the coil edge side. The stress at the end of the coil was measured.

As described above, a stress distribution is generated in the width direction at the time of opening. As a result, it is considered that outer peripheral flaws are concentrated on the edge portion of the coil.

As a result of further diligent studies based on these findings, the present inventors have found that the shape of the tip of the opener arm can be smoothed by making the contact surface with the coil convex to smooth the stress distribution in the width direction when the coil is opened. It was possible to suppress the occurrence of flaws on the outer circumference of the coil.

The present invention is based on the above findings, and the gist thereof is as follows.
[1] In a coil opener facility provided with an opener arm that opens the tip of a metal band wound in a coil shape.
A coil opener facility characterized in that the shape of the tip of the opener arm is a convex shape on a contact surface with the metal band in the width direction of the metal band.
[2] The coil opener equipment according to [1], wherein the height of the apex of the convex shape is 1.5 to 2.5 mm.
[3] The coil opener equipment according to [1] or [2], wherein the convex shape has a chevron shape.
[4] The tip of the coiled metal strip placed on the cradle roll
Unwind by rotating the cradle roll,
When opening the tip of the metal band unwound by the opener arm that constitutes the coil opener equipment,
A method of opening a metal band using a coil opener facility, wherein the shape of the tip of the opener arm is a convex shape on a contact surface with the metal band in the width direction of the metal band.

According to the present invention, it is possible to suppress the occurrence of flaws on the outer periphery of the coil. Further, according to the present invention, it is possible to easily open the end of the coil without causing a defect even if the material is thick.

FIG. 1 is a side view of the coil opener equipment as viewed from the side, FIG. 1A is a side view of the opener arm constituting the coil opener equipment as viewed from the side, and FIG. 1B is a side view of the tip of the opener arm. FIG. 1C is a schematic view showing how the coil is brought into contact with the outer periphery, and FIG. 1C is a schematic view showing how the tip of the coil is opened. FIG. 2 is a perspective view of the shape of the tip of the opener arm as viewed from above. 3A and 3B are schematic views showing the shape of the tip of the opener arm, FIG. 3A is a schematic view showing the shape of the tip of the conventional opener arm, and FIG. 3B is the tip of the opener arm according to the present invention. It is a schematic diagram which shows the shape of. FIG. 4 is a diagram showing an analysis model of compressive stress generated when the coil is opened. FIG. 5 is a schematic view showing the shape of the tip of the opener arm according to another embodiment of the present invention. FIG. 6 is a graph showing the occurrence rate of flaws on the outer circumference of the coil after opening in the embodiment.

The present invention will be described in detail below with reference to the drawings. FIG. 3 is a schematic view showing the shape of the tip 2 of the opener arm, and is a cross-sectional view showing a contact surface with a coil (metal band). FIG. 3A is a schematic view showing the shape of the tip 2 of the conventional opener arm, and as described above, the contact surface has a linear shape (rectangular shape).

On the other hand, as shown in FIG. 3B, the shape of the tip 2 of the opener arm of the present invention has a convex shape on the contact surface with the metal band, and is centered in the width direction of the metal band. The portion has a shape higher than the edge portion. Since the contact surface with the metal band has a convex shape in this way, the load acting on the tip of the coil opener from the tip of the coil after C warp deformation is received by the entire width of the tip of the coil opener at the time of opening. Is possible. As a result, the occurrence of a local stress increase region in the width direction at the time of opening can be suppressed, and as a result, the occurrence of coil outer peripheral flaws can be suppressed.

The compressive stress generated when the coil was opened was analyzed for the case where the conventional coil opener was used and the case where the coil opener of the present invention was used. The analysis model is shown in FIG. As shown in FIG. 4, the cradle roll, the upper presser roll, the coil inner peripheral portion were modeled as a rigid body, the coil outermost peripheral portion was modeled as an elastic body, and the opener arm tip portion was modeled as an elasto-plastic body, and FEM analysis was performed. Coil rotation amount: 30 °, Coil Young's modulus: 206 GPa, Coil specific gravity: 7.86 g / cm ³ , Coil thickness: 17.5 mm, Coil width: 1600 mm, Coil radius 935 mm, Young at the tip of the opener arm The rate was 206 GPa, and the specific gravity at the tip of the opener arm was 7.83 g / cm ³ . Regarding the shape of the opener arm, the height ΔH of the convex apex is analyzed by FEM for 0 mm (conventional opener arm, that is, the contact surface with the coil is a straight line), 1 mm and 2 mm (the present invention), respectively. went.

The results of FEM analysis are shown in Table 4.

From the results in Table 4, when ΔH = 0, which is the tip shape of the conventional opener arm, a maximum compressive stress of about 33.7 MPa is locally generated at the edge of the coil. On the other hand, when ΔH is 1 mm and 2 mm, the stress distribution in the width direction is smoothed, and when ΔH = 2 mm, the maximum compressive stress at the edge is about 5.1 MPa, which is 80% of that of the tip of the conventional opener arm. It can be seen that the compressive stress is reduced as described above.

From the above results, according to the present invention, it is possible to suppress the occurrence of a local stress increase region in the width direction, and even if the steel material (metal strip) has a thick plate thickness, no flaws occur. It is possible to easily open the end of the coil.

In the present invention, the height (ΔH) of the apex of the convex shape is preferably 1.5 to 2.5 mm. By setting the height of the apex (ΔH) to 1.5 to 2.5 mm, the load acting on the tip of the coil opener from the tip of the coil after C warp deformation can be received by the entire width of the tip of the coil opener at the time of opening. It will be possible. As a result, the occurrence of a local stress increase region in the width direction at the time of opening can be suppressed, and as a result, the occurrence of coil outer peripheral flaws can be suppressed.

The shape of the tip of the opener arm may be any shape that can suppress the generation of a local stress increase region in the width direction when the coil is opened. For example, the convex shape is preferably a chevron shape (see FIG. 3B). By forming the chevron shape, it is possible to suppress an increase in local stress in the metal band width direction when the coil is opened, and to suppress the occurrence of outer peripheral flaws of the coil. In addition, the chevron shape is easier to process than other shapes (for example, a parabolic shape that is convex upward).

Further, since the shape of the tip of the opener arm may be such that the contact surface has a predetermined height, for example, even if the contact surface with the coil has an arc shape as shown in FIG. 5A. Good. In the case of an arc shape, the radius of curvature R is preferably 300 to 400 mm. Further, the contact surface with the coil may have a polygonal shape inscribed in an arc shape as shown in FIG. 5 (b). Even if it has an arc shape or a polygonal shape inscribed in the arc shape, it suppresses the occurrence of a local stress increase region in the width direction at the time of opening, and as a result, suppresses the occurrence of coil outer peripheral flaws. be able to.

In the present invention, the thickness of the metal band (coil) is preferably 10 to 30 mm. The width of the metal band (plate width) is preferably 1000 to 2500 mm. With the coil opener equipment of the present invention, it is possible to easily open the coil end without causing a defect even if the material is thick.

For a coil having a plate thickness of 11 to 25 mm and a plate width of 1000 to 1900 mm, the end of the coil was opened using the coil opener equipment of the present invention. The shape of the tip of the opener arm in the coil opener equipment of the present invention has a mountain-shaped contact surface and a height ΔH of 2 mm.

The incidence of flaws on the outer circumference of the coil after opening was investigated and compared with the incidence of flaws at the time of coil opening when the conventional coil opener equipment was used. The incidence of defects was determined by a visual visual inspection by a coil inspector.

The results are shown in FIG.

When the conventional coil opener equipment was used, 40% (22/55) of the flaws on the outer circumference of the coil were generated, but when the coil opener equipment of the present invention was used, the occurrence rate of the flaws was 0% (0). / 62), and the effect of suppressing flaws on the outer circumference of the coil could be confirmed.

1 Opener arm 2 (of the opener arm) Tip 3 Cylinder 4 Cradle roll S coil (metal band)

Claims (4)

In a coil opener facility equipped with an opener arm that opens the tip of a metal band wound in a coil shape.
A coil opener facility characterized in that the shape of the tip of the opener arm is a convex shape on a contact surface with the metal band in the width direction of the metal band. The coil opener equipment according to claim 1, wherein the height of the apex of the convex shape is 1.5 to 2.5 mm. The coil opener equipment according to claim 1 or 2, wherein the convex shape has a chevron shape. The tip of the coiled metal strip placed on the cradle roll,
Unwind by rotating the cradle roll,
When opening the tip of the metal band unwound by the opener arm that constitutes the coil opener equipment,
A method of opening a metal band using a coil opener facility, wherein the shape of the tip of the opener arm is a convex shape on a contact surface with the metal band in the width direction of the metal band.

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