JPH0833904A - Masher roll device and operation method thereof - Google Patents

Abstract

PURPOSE:To improve surface quality of a metallic material by arranging a roll with a radial crown on the side with both edges embedded and arranging a taper roll on the projecting side. CONSTITUTION:A lower roll 3 is an ordinary taper roll, while an upper roll 2 is a radial crown roll having a circular-arcuate profile with a radius R. Then, when the contact position is changed in the width direction, the contact angle also changes, becoming larger as a contact point with the edge of a steel strip 1 shifts to the left and smaller as it shifts to the right. The start angle theta1 from the perpendicular from the circular-arc center and the finish angle theta2 are decided from the data of an inclination angle alpha generated on the steel strip 1. The opening degree B of the masher roll is decided against the thickness (t) and the width H as B= at-l-H. The quality of the rolls 2, 3 is ball-bearing steel SUJ2 with a surface hardness (HS) 90. Thus, the generation of stripe patterns due to straightening is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masher roll device for correcting a burr generated by a trimming process such as a side trimmer or a slitter in a metal strip process line.

[0002]

2. Description of the Related Art In the process of manufacturing and processing a metal strip such as a steel strip (hereinafter, a steel strip will be representatively described), a wide strip is divided into narrow strips, or both end shapes in the width direction are defective. In order to remove a portion or the like, slitting or trimming for continuously shearing a steel strip by a pair of upper and lower rotary cutters set at predetermined positions in the width direction of the steel strip is generally performed.

Such processing causes some "blade burr" on the cut surface to varying degrees. Since the blade collar is work hardened and has a sharp shape, it is dangerous when handling steel strips, and there is a problem that gaps are created between layers when the steel strips are coiled or stacked. Therefore, various blades have been proposed to remove or correct the burr. (Hereinafter, the trimming process is assumed to be left-right symmetrical in the width direction of the steel strip, and will be described with a partial view showing only one side.) For example, FIG. 8 shows a blade disclosed in Japanese Patent Laid-Open No. 4-138805. In the partial front view showing the main part of the burr correction device,
A pair of upper and lower rolls 2 and 3 so as to press both ends of the steel strip 1.
Is arranged and the edges of the blades are crushed by rolls 2 and 3 to correct it. Usually, such rolls 2 and 3 are referred to as masher rolls.

As shown in FIG. 8, the masher roll is often a taper roll having the same shape as the upper and lower rolls and having a thin inner side in the width direction of the steel strip. FIG. 3 schematically shows a situation in which the blades at the edges of the steel strip 1 are used to correct the burr by using the upper and lower tapered rolls 2 and 3. The direction in which the blade is burred depends on how the cutter of the trimming device is attached and is constant. In this specification, the edge portion of the steel strip 1 is assumed to hang downward as shown in this figure.

FIG. 4 is an enlarged view of a part of FIG. 3, in which the upper end portion which is deeper than the surface of the steel strip 1 comes into contact with the upper roll 2 in a range of width w. With bright materials such as stainless steel, streak patterns of this width are likely to occur on the surface of the steel strip. The width w may be about 3 or 4 mm, which is a problem especially for strict width materials such as edge-cutting materials with strict width tolerance, and improvement has been desired.

As is clear from FIG. 4, when the taper of the upper roll 2 is increased, the contact position between the upper end of the steel strip 1 and the upper roll 2 moves to the right, and the streak pattern generation region gradually increases. Not only the streak pattern decreases because it moves to the right,
If it comes into contact only with the corners, the streak pattern can be almost eliminated. However, if the taper is increased,
When the plate thickness of the steel strip 1 is thin, there is a problem in that the range of use of the masher roll in the width direction becomes narrower by that much, and stable operation becomes difficult.

Further, as can be seen from FIG. 4, even if the contact angle is the same, if the rolling force is excessive, the steel strip is crushed and the width of the stripe pattern becomes large. Therefore, it is desirable to minimize the rolling force.

[0008]

SUMMARY OF THE INVENTION The present invention provides a masher roll device and a method of operating the masher roll device for preventing streak pattern generation and correcting blade burr with good quality by appropriately selecting a contact angle and a pressing force. Aim to achieve.

[0009]

The present invention as set forth in claim 1, wherein a pair of upper and lower rolls are pressed against both edges of the trimmed metal strip to correct the burr caused by the trimming process. In the above, one of the upper and lower rolls is a roll with a radial crown, the other roll is a taper roll, the rolls with a radial crown are arranged on the recessed sides of both edge portions of the metal strip, and the taper rolls are arranged on the protruding side. It is a Masha roll device characterized in that.

The present invention according to claim 2 is the method of operating the above-mentioned masher roll device, wherein the position setting in the width direction of the upper and lower rolls is changed according to the plate thickness of the metal strip. The present invention according to claim 3 is the operating method of the above-mentioned mastica roll device, wherein the rolling force setting of the upper and lower rolls is changed according to the plate thickness of the metal strip. According to the fourth aspect of the present invention, the position setting of the upper and lower rolls in the width direction is changed according to the plate thickness of the metal strip, and the rolling force setting of the upper and lower rolls is changed according to the plate thickness of the metal strip. It is a method of operating the above-described mash roll device.

[0011]

[Operation] According to the present invention, the inclination of the mash roll is equal to or more than the amount of sag of the edge portion of the steel strip, and the rolling force of the mash roll is minimized. Figure 5
[Fig. 3] is an example of a graph showing the relationship between the plate thickness of a steel strip and the rolling force of a mash roll required for straightening the blade. It can be seen that the roll force F of the Masher roll is required substantially in proportion to the plate thickness t.

FIG. 6A shows the relationship between the plate thickness t of the steel strip 1 having the profile shown in FIG. 6B and the inclination angle α of the edge portion. It can be seen that the inclination angle α tends to increase as the plate thickness t increases. When the plate thickness t is in the range of 1 to 3 mm, the inclination angle α is 2.5 to 5 °. In the present invention,
A radial crown is applied to the counter-blade side of the masher roll, and the opening of the masher roll in the width direction of the steel strip is set in proportion to the plate thickness. Made the corners change. Further, since the air pressure of the cylinder that rolls down the muffler roll is made variable so as not to roll down more than the rolling down force corresponding to the plate thickness, it is possible to almost completely prevent the generation of the streak pattern.

[0013]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a masher roll device for carrying out the present invention, FIG. 2 is a detailed view of the roll portion of FIG. 1, and 1 is a steel strip, 2 is a roll, 3 is a roll, 5 is a reduction cylinder, 6 is an electropneumatic converter, Reference numeral 7 is a housing, 8 is a screw shaft, and 9 is an opening / closing motor.

In this masher roll device, the edge portion of the steel strip 1 is pressed by a pair of upper and lower rolls 2 and 3 to correct the burr of the blade. The lower roll 3 is fixed to the housing 7, but the upper roll 2 is attached to the housing 7 via the pressure-reducing cylinder 5 and is reduced by a predetermined air pressure set by the electropneumatic converter 6. On the other hand, the housing 7
It is supported by a screw shaft 8 via a ball screw so as to be openable and closable in the width direction of the steel strip 1, and is set to a predetermined opening by driving an opening / closing motor 9.

As shown in FIG. 2, the lower roll 3 is a normal taper roll. On the other hand, since the upper roll 2 is a radial crown roll whose profile is an arc shape having a radius R, when the contact position changes in the width direction, the contact angle also changes. For example, in FIG. As the contact point with the part goes to the left, the contact angle becomes larger, and as it goes to the right, it becomes smaller. In this figure, the position of the center O of the arc, the start angle θ ₁ and the end angle θ ₂ of the arc seen from the perpendicular line drawn from O are calculated from the data of the inclination angle α generated in the steel strip 1 processed by the line. Determine as appropriate.

The opening B of the masher roll is appropriately set as B = at + H (1) with respect to the plate thickness t and the plate width H of the steel strip, where a is a constant. Since the position of the upper roll 2 in contact with the upper roll 2 can be arbitrarily determined, the contact angle corresponding to the inclination angle α of the steel strip 1 may be selected within the range of θ ₁ to θ ₂ .

Further, the rolling down force F of the masher roll is b,
If c is a constant, by appropriately setting F = b + ct (2) with respect to the plate thickness t of the steel strip, it is possible to avoid pressurizing more than necessary. In this way, it is possible to completely prevent the generation of the streak pattern on the back side of the counter blade by appropriately controlling the pressurization state of the masher roll with respect to the plate thickness.

As a concrete example, the material of the rolls 2 and 3 is bearing steel SUJ2 having a surface hardness (Hs) of 90, and the diameter on the large diameter side is
100 mm, the taper of the lower roll 3 is 1/125, and the radial crown amount of the upper roll 2 is R = 840 m from the data of FIG.
m, θ ₁ = 4 °, θ ₂ = 5.71 °, and the roll length (usage range) was 25 mm. Also, the constant a = 1 in the equation (1)
4, from the data of FIG. 5, the constant b = 60 in the equation (2),
c = 70.

With the above settings, the plate thickness t = 0.6 to 3.0 mm
As shown in Fig. 7, when the blade of the glossy material of the stainless steel strip was straightened, the amount of streak pattern was drastically reduced as compared with the conventional method, and the streak pattern which was 3.1 mm in width was generated. , Could be stopped at 0.5mm. Note that, as described above, the steel strip has been described as hanging downward, and it goes without saying that a radial crown roll is used as the lower roll when the steel strip is facing downward. Further, the reduction cylinder may be applied to either the upper or lower roll depending on the device.

[0020]

EFFECTS OF THE INVENTION According to the present invention, the generation of streak patterns due to the straightening of the blade is reduced, and the surface quality of high-grade metal materials such as stainless steel strips is improved, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a partial front view showing a main part of a mash roll device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view showing a roll portion of FIG. 1 in an enlarged manner.

FIG. 3 is a schematic diagram showing a situation where a blade is straightened by a masher roll.

FIG. 4 is a partially enlarged view showing a part of FIG. 3 in an enlarged manner.

FIG. 5 is a graph showing the relationship between the plate thickness of the steel strip and the necessary rolling force.

FIG. 6 is a graph showing the relationship between the plate thickness of the steel strip and the inclination angle of the edge portion.

FIG. 7 is a graph showing the effect of the present invention.

FIG. 8 is a partial front view showing a main part of a conventional muffler roll device.

[Explanation of symbols]

 1 steel strip 2, (upper) roll 3 (lower) roll 5 reduction cylinder 6 electro-pneumatic converter 7 housing 8 screw shaft 9 opening / closing motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Goji Katsushima, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture, Kawasaki Steel Co., Ltd. 1 Kawasaki-cho, Chuo-ku Kawasaki Steel Co., Ltd. Chiba Works, Steel Development & Production Division

Claims (4)

[Claims] 1. A masher roll device for pressing a pair of upper and lower rolls against both edges of a trimmed metal strip (1) to correct the burr caused by the trimming process. One is a roll with a radial crown, the other is a roll with a taper, the roll with a radial crown is arranged on the recessed side of both edges of the metal strip (1), and the taper roll is arranged on the protruding side. Mash roll equipment. 2. The method of operating a masher roll device according to claim 1, wherein the position setting in the width direction of the upper and lower rolls is changed according to the plate thickness of the metal strip. 3. The method of operating a mash roll device according to claim 1, wherein the setting of the pressing force of the upper and lower rolls is changed according to the plate thickness of the metal strip. 4. The position setting in the width direction of the upper and lower rolls is changed according to the plate thickness of the metal strip, and the rolling force setting of the upper and lower rolls is changed according to the plate thickness of the metal strip. Method of operating the masher roll device.