JPH11267713A - Method for trimming free from burr and masher roll equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for trimming free from burrs and a masher roll equipment suitable for this method by which a strip sheet different in kind of steel, thickness or others is surely cut off from burrs and does not generate uneven shapes such as waves. SOLUTION: A masher roll equipment 1 has a clearance ε between an upper frame 3 and a lower frame 4, and the lower frame 4 is pin-supported and is tilted under the upper frame 3. The clearance ε is equipped with a tilting adjusting mechanism 5 by which a tilting angle of a masher roll 2 is adjusted. Regarding the tilting angle, a previous test is executed with the objective thin sheet S on off-line, a tilting angle is selected by which a suitable screw down force distribution is obtained, and then is set by the tilting angle adjusting mechanism 5. Accordingly, when the masher roll 2 is rolled down and a method for trimming free from burrs is executed, burrs are surely cut off and defective shapes such as waves and edge cracks are decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a method of trimming the widthwise end of a strip-shaped metal plate (also referred to as a metal strip) such as a running thin steel plate, and reducing the generated burrs with a masher roll, and the method. Masher roll device.

[0002]

2. Description of the Related Art It is known that, for example, when the widthwise end of a running thin steel plate is trimmed, burrs are formed at the widthwise end of the thin steel plate. This burr lowers the quality of the product, and also causes problems such as scratching the roll surface when passed through a post-process.

[0003] Therefore, generally, after trimming,
A burring-free trimming method is employed in which a backup roll is provided, and a masher roll is pressed against the burrs at the ends in the width direction of the thin steel sheet to reduce the burrs and separate the burrs.

[0004] However, there are problems such as insufficient removal of burrs and the occurrence of non-uniform shapes such as ear waves, and various measures have been studied.

In Japanese Patent Application Laid-Open No. 2-292114, a cut is made by a side trimmer so as to leave an uncut portion at both ends in the width direction of the running strip-shaped metal plate. And a method of separating an uncut portion by pressing it.

Here, when making a cut so as to leave an uncut portion, the thickness t ₁ of the portion where the band-shaped metal plate is to be cut is measured at the entry side of the side trimmer, and at the exit side of the side trimmer,
By the side trimmer in a state where notched, the total thickness t ₂ at the cut point is measured, so that the _{t 2 = t 1 (d 1} ~d 2), the upper and lower blades in the side trimmers Control of the overlap of the upper blade and the lower blade so as to be within a predetermined range, and at the exit side of the side trimmer, the notch is pressed in the thickness direction by a push-back roll, and the roll is rolled. The uncut portion is separated by controlling the interval t ₀ = t ₁ (1 + k). d1 _, d2 _{, and} k are constants determined by the material of the strip-shaped metal plate.

Japanese Patent Application Laid-Open No. 1-118302 discloses a device for holding a masher roll for high-speed trimming. Here, the crown type masher roll is held by a pair of holding arms, and the holding arm is fixed to the tip of the movable base. A plurality of fixed nuts meshing with the screw rod are fixedly mounted on the moving table, and biasing means such as a spring or a hydraulic cylinder is provided between the nuts or between the moving table holding frame and the moving table. This prevents horizontal deflection of the carriage due to the gap between the external thread teeth of the screw rod and the internal thread teeth of the fixing nut, and prevents burrs at the width direction end of the strip-shaped metal plate even at high-speed trimming. The crushing marks do not become wavy.

[0008]

However, the above-mentioned prior art has the following problems.

In order to trim a strip-shaped metal plate such as a thin steel plate without burrs using a masher roll, it is important to reduce the squeezing force and the distribution of the squeezing force by the masher roll. It is necessary to

[0010] If the rolling force and the rolling force distribution are not appropriate, an excessive load is applied to the widthwise end of the strip-shaped metal plate to cause shape defects such as ear waves and edge cracks, and conversely, the widthwise end. Insufficient load at the part may cause burring failure.

JP-A-2-292114 and JP-A-1
In any of the techniques disclosed in JP-A-118302, there is no description about the rolling force distribution, and no suggestion is made.

[0012] In actual operation, a strip-shaped metal plate requiring burring-free trimming is generally handled by a masher roll device installed on one line, having different characteristics such as tensile strength and plate thickness. There is also a difference in the rolling force distribution state.

Further, since the actual equipment has deterioration and backlash, it is necessary to confirm whether or not the masher roll has given an appropriate rolling force distribution.

According to the technique disclosed in Japanese Patent Application Laid-Open No. 2-292114, the push-back roll is set to a roll interval t ₀ = t ₁ (1 + k) using a constant determined by the thickness of the sheet to be measured and the material of the metal strip each time. Controlled, but the operation is complicated.

The technique disclosed in Japanese Patent Application Laid-Open No. 1-118302 prevents lateral runout during high-speed trimming so that the burrows of the burrs at the widthwise ends of the strip-shaped metal plate do not become wavy. No mention is made of the method of rolling down with a masher roll, the roll shape, or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a long-time line for confirming and adjusting a strip-shaped metal plate having different steel types and plate thicknesses after trimming. An object of the present invention is to provide a burring-free trimming method capable of securely separating burrs without stopping and preventing uneven shapes such as ear waves, and a masher roll device suitable for this method.

[0017]

According to a first aspect of the present invention, there is provided a method for trimming a widthwise end of a running strip-shaped metal plate and reducing a generated burr with a masher roll. When the rolling force distribution on the width direction end surface of the strip-shaped metal plate is defined as h / a = 20 to 5 when the end side is the base side and the base a is the height h.
The burring-free trimming method is characterized in that the crushing is performed by a masher roll so as to form an isosceles triangular shape satisfying a range of 5.

The second invention is a masher roll device suitable for carrying out the first invention, which is a masher roll device having a masher roll for lowering a trimmed width direction end and a masher roll support base. So,
The support gantry is composed of an upper and lower gantry provided with a gap, the lower gantry is pivotally supported on the upper gantry, and a tilt adjustment mechanism is provided in the gap to enable tilting in the width direction of the band-shaped metal plate. .

According to the present invention, an inclination angle at which an appropriate rolling force distribution is selected in advance according to the target strip-shaped metal plate is selected and set as the set inclination angle, and the slashing is performed by the masher roll. And shape defects such as ear waves and edge cracks can be prevented.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with respect to a typical thin steel plate.

FIG. 1 is a perspective view showing an outline of an embodiment of the masher roll device of the present invention.

The masher roll device 1 includes a masher roll 2, an upper pedestal 3 and a lower pedestal 4 provided with a predetermined gap ε.
And a tilt adjustment mechanism 5 provided in the gap ε.

The masher roll 2 is a straight roll. The straight body type roll can easily adjust the inclination angle.
However, it is not limited to this.

The masher roll device 1 is provided with a holding arm 6 on the upper pedestal 3 and a moving table 7 on the upper part of the holding arm 6, and is moved up and down as shown by a thick arrow by a commonly used vertical pressing mechanism (not shown). The moving table 7 can be moved in the width direction of the thin steel sheet S as indicated by a thick arrow by a commonly used horizontal moving mechanism (not shown).

A gap ε is provided between the upper gantry 3 and the lower gantry 4, and the lower gantry 4 is supported by the upper gantry 3 by a rotating shaft 8, and tilts below the upper gantry 3 as indicated by a thick arrow. Have been able to.

A tilt adjusting mechanism 5 is attached to the gap ε so that the tilt angle of the lower gantry 4 with respect to the thin steel plate S, that is, the tilt angle of the masher roll can be adjusted. The inclination angle is set to
The tilt adjustment mechanism 5 sets a tilt angle at which an appropriate rolling force distribution has been obtained by testing S in advance, as a tilt angle.

Here, the set inclination angle is adjusted by the adjusting nut 9 using a bolt nut. The tilt adjustment mechanism 5 using bolts and nuts is easy to adjust and has high accuracy, but is not limited to this. Any mechanism can be used as long as the tilt angle of the lower gantry 4 can be adjusted.

Next, the distribution of the rolling force according to the steel type, plate thickness and the like by the masher roll 2 will be described in detail.

FIG. 2 is a view showing a state of measurement of a rolling force distribution of a target thin steel sheet by the masher roll of the present invention, and FIG.
FIG. 3 is a view taken along line AA of FIG. 2.

The masher roll 2 is positioned so that its center is located approximately at the end of the thin steel sheet S. Reference numeral 10 denotes a back-up roll 10. Next, masher roll 2
When a rolling force is applied from above as shown by a bold arrow, a red rolling force distribution pattern is generated on the end side of the thin steel sheet S in contact with the masher roll 2. The rolling force distribution can be easily confirmed using commercially available pressure-sensitive paper. Here, assuming that the center M of the masher roll 2 is tilted about the fulcrum to set the base a and the height h, as shown in FIG. The inclination angle θ at which the pattern 11b is obtained is selected. Reference horizontal axis of the code L ₁ is masher roll 2, L ₂ is the tilt axis when is tilted a masher roll 2. Reference numerals P, O, and Q indicate corresponding positions in FIGS.

FIG. 4 is a diagram showing the relationship between the rolling force distribution pattern and the trimming state. As shown in FIG. 4, the rolling force distribution pattern 11 is roughly classified into a rectangular pattern 11a, a long isosceles triangular pattern 11b, and a short isosceles triangular pattern 11c according to the characteristics of the thin steel sheet S, the rolling force, and the like. You. These patterns are triangular patterns 11b each having a long isosceles shape when viewed from the trimmed state.
Is good, the rectangular pattern 11a has a bad burr separation problem, and the short isosceles triangular pattern 11c has ear waves and edge cracks.

By examining the above-described rolling force distribution pattern 11 in advance for the thin steel sheets S having different characteristics, rolling forces, and the like, the inclination angle of the masher roll for obtaining a good triangular pattern 11b of the target thin steel sheet S can be obtained. Can be set.

Table 1 shows the results obtained when an appropriate rolling force distribution pattern 11 was obtained for the thin steel sheets S having different characteristics and rolling forces as described above.

[0034]

[Table 1]

The typical appropriate rolling force in the case of Table 1 is as follows. When the tensile strength is> 100 kfg / mm ² , the rolling force 1100 to 1600 kfg Gradual decrease toward line center In case of tensile strength ≦ 100 kfg / mm ² Rolling force Plate thickness <0.7 mm 150-250 kfg 0.7 <plate thickness <1.2 mm 250-350 kfg 1.2 <plate thickness <3.0 mm 350 ~ 500kfg Decline toward line center

As described above, the rolling force distribution on the end surface of the thin steel sheet S pressed down by the masher roll 2 is such that when the end side is the base side, the base a and the height h are h / a = 20 ~
It is necessary to reduce the pressure with a masher roll so as to form an isosceles triangle that satisfies the range of 55.

The inclination angle for obtaining an appropriate rolling force distribution changes depending on conditions such as the shape of the masher roll, the characteristics of the target thin steel sheet, and the thickness of the thin steel sheet. It is necessary to select a tilt angle and set the tilt angle.

FIG. 5 is a diagram showing a line flow embodying the present invention. After the thin steel sheet S is rewound by the rewinding machine 12 and trimmed by the side trimmer 14, the masher roll 2 having an inclination angle set so as to have an appropriate rolling force distribution by the rolling force according to the characteristics of the steel type according to the present invention. By the rolling force. Reference numeral 10 denotes a backup roll.

As a result, it is possible to obtain a good product in which the burr is reliably separated without any line stop for confirmation and adjustment after trimming, and free of shape defects such as ear waves and edge cracks. did it. Symbol 13 is shear, 15
Is a winder.

As described in the above embodiment, the inclination angle at which an appropriate rolling force distribution can be obtained in advance according to the characteristics of the target thin steel sheet and the like, and the inclination angle of the masher roll 2 is adjusted by the tilt adjusting mechanism. 5 is adjusted and set, so if the trimming method without burrs is performed by pressing down with the masher roll 2, the burrs are surely separated, and
Shape defects such as edge cracks are reduced. For this reason, the quality of the product is improved, and there is no problem such as flaws on the roll surface when the sheet is passed through a post-process.

In addition, since there is no long-time line stoppage due to adjustment work such as confirmation after trimming and roll exchange,
Line downtime can be greatly reduced.

Even if a trimming defect occurs, line stoppage does not occur for a long time in adjusting the roll installation state or replacing the roll, and the above-described adjustment mechanism eliminates the need for complicated operations, equipment, and control devices. The adjustment can be performed simply and reliably by stopping the line for a short time. Further, in order to perform stable burring-free trimming, it is not necessary to have a plurality of masher rolls having different shapes.

[0043]

According to the present invention, the burrs can be reliably separated without removing the strip-shaped metal plates having different steel types and plate thicknesses after trimming, and without stopping the line for a long time for adjustment work. In addition, non-uniform shapes such as ear waves can be prevented. Further, the above method can be easily performed by providing the masher roll device with a simple tilt adjustment mechanism.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outline of an embodiment of a masher roll device of the present invention.

FIG. 2 is a diagram showing a measurement state of a rolling force distribution of a target thin steel sheet by a masher roll of the present invention.

FIG. 3 is a view taken in the direction of arrows AA in FIG. 2;

FIG. 4 is a diagram illustrating a relationship between a rolling force distribution pattern and a trimming state according to the present invention.

FIG. 5 is a diagram showing a line flow implementing the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 masher roll device 2 masher roll 3 upper pedestal 4 lower pedestal 5 tilt adjustment mechanism 6 holding arm 7 movable base 8 rotating shaft 9 adjustment nut 10 back-up roll 11 rolling-down force distribution pattern 11a rectangular pattern 11b triangular pattern with long isosceles, 11c Short isosceles triangular pattern 12 Rewinding machine 13 Shear 14 Side trimmer 15 Winding machine

Continued on the front page (72) Inventor Shinki Sumiyoshi 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Kiyomitsu Tsuchiya 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Inside the corporation

Claims (2)

[Claims] 1. A method for trimming a widthwise end of a running strip-shaped metal plate and reducing a generated burr with a masher roll, wherein the widthwise end surface of the strip-shaped metal plate pressed down by the masher roll is provided. When the end portion side is the bottom side, the bottom side a and the height h, the rolling force distribution is reduced by a masher roll so that the shape becomes an isosceles triangle satisfying the range of h / a = 20 to 55. Burr-free trimming method characterized by being performed. 2. A masher roll device comprising a masher roll and a masher roll support base for pressing down a width direction end of a trimmed strip-shaped metal plate, wherein the support base comprises an upper and lower stage mount having a gap, A masher roll device wherein a lower gantry is pivotally supported by an upper gantry, and a tilt adjusting mechanism is provided in the gap so as to be tiltable in the width direction of the band-shaped metal plate.