JPH07299506A - Metallic strip - Google Patents

Abstract

PURPOSE:To prevent the generation of a lap mark and top mark at the time of coiling in a metallic strip treating process, to improve the quality of product and to save resources by providing plural shapes having the width of the tip parts narrowed in the width direction on one or more of the longitudinal end parts of a metallic strip. CONSTITUTION:To prevent the lap mark at the time of coiling the strip in a metallic strip treating process or the next or the next after the next metallic strip treating process, such plural worked parts as the width of the tip parts is narrowed like a triangular shape or shapes similar to them or the like are imparted in the precedingly taken tip part of the metallic strip for preventing stress concentration. When the strip is coiled as it is in the metallic treating process, by tapering thickness also by ordinary work combined with ordinary rolling work in the metallic strip treating process or low load rolling work to only the worked parts, the lap mark is further reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This is a metal strip having a special longitudinal end shape, which is used for reducing lap marks.

[0002]

2. Description of the Related Art When winding a metal strip, it is wound around a winding machine called a mandrel or reel. At this time,
Defects often called mandrel marks, reel marks, lap marks, and top marks occur.

The main one of these defects is a bent mark generated in the portion overlapping the tip end after the second winding because the leading edge of the metal strip is rectangular.
These marks (hereinafter collectively referred to as lap marks) are
It occurs on every line that involves the winding of metal strips, and various countermeasures and proposals have been made.

The major prior arts are a press incorporating a shearing machine, a method of rolling the tip with a rotary shear, Japanese Patent Publication No. 2-83111, grinding with a grindstone, and rolling the tip in the width direction. -218201, JP-A-3-198917, JP-B-3-44327, and JP-A-3-1420 in which a tip portion is obliquely cut by a shearing machine.
There are 13 and so on.

[0005]

According to the inventor's knowledge and experiments, in order to prevent this kind of lap mark, stress concentration at the same position in the width direction is prevented, or a surface having a certain length is used. It is necessary to process the tip of the metal strip when winding the metal strip into a shape for reducing the pressure.

On the other hand, the technique (1) requires a load of 1000 tons or more for direct pressing, which is very large industrially. In addition, since the technique of (1) is sheared by a drum shear and is also processed by rolling once in the length direction of the metal strip, a load of 1000 t or more similar to that of a normal rolling mill is required.

Next, in the mechanical grinding process, if the tapered shape becomes long, the processing time becomes long, and if the processing of the grinding dust is incomplete, it causes another new defect,
It is necessary to consider the processing equipment and processing time separately.

On the other hand, since the technique of full-scale rolling is to roll in the width direction, the flow of the material (the tip of the metal strip) is preferential in the width direction, but it is not subjected to tapering. The rolling pressure is increased due to the restraint of the rolling part, and waviness is likely to occur at the tip part.If waviness occurs, the meaning of the tapering process is halved.If the waviness is large, overlapping occurs during rolling. May result in defects. In addition, in order to secure the processing length by one rolling process, a load similar to a normal rolling mill is required.

Further, the technique (1) is excellent in terms of preventing stress concentration at the same position in the width direction, but since the cutting length is long, the yield loss is large, and lap marks can be reduced by rolling or pressing. A large cost was required for industrialization, such as the combined use of the above means.

[0010]

SUMMARY OF THE INVENTION The present invention provides a metal strip, characterized in that one or more of the longitudinal ends of the metal strip are provided with a shape such that the widths of a plurality of tips are narrowed in the width direction.

A second feature is that a plurality of triangular shapes, trapezoidal shapes, arc shapes, shapes similar to these or combinations thereof, or a mixed shape thereof are provided in one or more of the longitudinal ends of the metal strip in the width direction. A metal strip having one or more end shapes.

A third feature is that a plurality of triangular shapes, trapezoidal shapes, circular arc shapes, shapes similar to these or combinations thereof, or a mixed shape thereof are provided in one or more of the longitudinal ends of the metal strip in the width direction. A metal strip having one or more end shapes, and one or more of the long end portions thereof has a plate thickness tapering in the longitudinal end direction.

[0013]

The metal strip of the present invention has the metal strip treatment process,
Or, to prevent the lap mark at the time of winding in the next and next metal strip processing process, in order to prevent stress concentration at the same position in the width direction, at the winding tip of the metal strip,
A plurality of triangular shapes are formed in the width direction, and a processed portion such as a shape similar to these is formed so that the width of the tip portion is narrowed.

In the case of winding as it is in the metal band treatment process, the plate thickness is also tapered by the normal work which is also used for the normal rolling work in the metal band treatment process or the constant load rolling work only in the working part to further reduce the lap mark. It can be reduced. Similarly, for winding in the next metal strip treatment process, the tail end of the metal strip is provided with the processed portion having the above-mentioned shape, and the same treatment as described above is performed.

The widthwise processing of the longitudinal end shape can be carried out by shearing, trimming, gas cutting, laser cutting, plasma cutting, etc., but it is usually carried out by punching, trapezoidal, triangular,
Any shape such as an arc shape may be used as long as the width of the tip portion is narrowed, and a punching machine that punches out the entire width in the width direction at the same time or a punching machine that punches out at a plurality of locations may be used.

This punching machine may be used together with the function of an in-line shearing machine for removing defective parts in the metal strip processing process line.

The interval in the width direction, such as a trapezoid, does not have to be constant, but it is an important factor in preventing the occurrence of lap marks. If this interval is too large, the winding tightening force after the second winding cannot be resisted, and there is a possibility that bending deformation may occur after the second winding and the generation of the lap mark cannot be prevented. Further, if the interval is narrow, the effect of reducing the load for tapering the plate thickness in the next step or the like becomes small, and the apparatus becomes large.

Further, even if the shapes are different in the width direction, the tip end portions may not be aligned in the width direction. If you cut the metal edge in a large angle in advance and narrow the overall width of the tip before performing the above punching process, it will be more efficient, but there is a drawback that the length of the non-product becomes long. Efficiency,
This method needs to be applied depending on the product yield.

Further, the plate thickness of the above-mentioned long end portion of the metal strip is tapered in the direction of the long end portion, and the surface pressure between the second strip of the metal strip is set along the winding machine at the time of winding. It transforms without any problem.

The tapered shape such that the tip of the plate thickness such as the trapezoidal portion in the width direction becomes thin is processed by any of rolling, pressing, polishing, grinding, and cutting. For example, by processing it into a taper shape, As with processing the entire width, it is possible to prevent the occurrence of lap marks. By tapering the shape in the width direction in this way, the total amount of processing can be reduced in areas where the degree of processing is large in the thickness direction, making it possible to perform processing significantly easier than full-width processing, and greatly shortening the processing time. The processing equipment can be simplified.

When the present invention is carried out by the rolling method, as shown in FIG. 6, it can be seen that the rolling load per unit width is almost proportional to the reduction amount depending on the working amount. That is, if the tip working width shape is inversely proportional to the reduction amount, the taper working can be performed with a substantially constant rolling load. This can make control of the processing significantly easier.

Even if this is achieved by a method of rolling with a rolling mill having a large droop rate (soft), for example, a spring, in which the roll gap is largely changed in response to changes in rolling load. good.

As the metal strip treatment process, a punching machine for punching in the width direction in-line and a taper device may be provided in series, or a part or all of these may be provided outside the line for pre-processing. As a metal strip processing process, in order to prevent the occurrence of lap marks in the next step,
It is possible to connect the tail end of the metal strip with the above-described processing in-line or off-line.

Prior to the widthwise processing of the trapezoidal shape of the longitudinal end, it is possible to heat the processing tip before heating it, or after punching, heat the processing tip and then taper it. The load can be reduced.

In particular, when it is applied before processing into a tapered plate thickness, the volume to be heated is a fraction of 1 to 1 of the total width.
Since it is / 10, the input energy can be reduced and the time required for heating can be shortened.

As the metal strip treatment process, a punching machine for punching in the width direction in-line, a device for heating at least one before and / or after the punching device, and a device for tapering may be connected in series. Part or all may be provided outside the line and pre-processed.

In the tapering process in the width direction, for example, a trapezoid is a straight line between the trapezoids in FIG. 2, but as shown in FIG. Inverted triangles and arcs are preferable.

The interval in the width direction such as a trapezoid does not have to be constant, but it is an important factor in preventing the occurrence of lap marks. If this interval is too large, the winding tightening force after the second winding cannot be resisted, and there is a possibility that bending deformation may occur after the second winding and the generation of the lap mark cannot be prevented. Moreover, if the interval is narrow, the effect of reducing the load for tapering becomes small, and the apparatus becomes large.

The optimum interval varies depending on the plate width, the plate thickness, the hardness of the material, etc., but according to the inventor's experiments, it has been confirmed that the range is 50 mm to 200 mm for the steel strip. The width of the processed part is 0 to 20 mm at the tip and 30 from the tip.
The range of 20 mm to 50 mm is preferable at mm.

When the present invention is applied to the case of rolling in the width direction and performing taper processing, elongation distortion in the width direction is generated in each trapezoidal portion, and the width of the trapezoidal portion becomes wider toward the tip, resulting in a punched space. Therefore, it is possible to completely eliminate the generation of the wavy shape due to the restriction of the material flow when the entire width is processed. By performing the tip processing of the present invention prior to the rolling, it is possible to prevent the processing width from being reduced, and it is possible to prevent the rolling load from becoming large due to restraint, so that the number of devices and the processing time can be reduced.

[0031]

EXAMPLE FIG. 1 is a view showing the length of a lap mark when winding is carried out using the steel strip of the present invention and the steel strip of the comparative example, in terms of the number of windings.

FIG. 2 is a view of the metal strip of the invention 1 or 2 as it is punched, and is a view of a metal strip having a tapered shape in which a plurality of tips are narrowed in the width direction at the longitudinal end of the present invention. It is processed by punching. In this embodiment, there is a straight line between the trapezoids. As shown in Figure 1,
The length of the lap mark is smaller than that of the steel strip obliquely cut at an angle of 40 ° of the comparative example.

After punching as shown in FIG. 2, a steel strip having a width of 200 mm was subjected to a constant load rolling under a load of 10 ton, and other conditions were rolled according to FIG. 9. Invention 3 has a uniform width as shown in FIG. Compared with a taper processing length of 30 mm,
The lap mark length is reduced.

FIG. 3 is a diagram of a metal strip manufacturing apparatus of the present invention.
The metal band 1 is sheared at a right angle in the width direction by a shearing machine 2 or is cut diagonally at a large angle to narrow the entire width of the tip, and then the tip is punched out by a punching machine 3 so that the widths of a plurality of tip parts in the width direction are reduced. This is a device for punching into a narrowed shape, rolling the punched portion into a tapered shape in the plate thickness direction by a constant-load rolling mill 4, and winding it by a winding machine 5.

In this apparatus, the rolling machine 5 is not used, but the winding machine 5 is used for winding, or the tail end of the metal strip 1 is punched by the punching machine 3 so that the width of a plurality of tip portions becomes narrow in the width direction. It may be punched and wound as it is in the next step, or may be wound while being rolled by a rolling mill.

As another apparatus, without the shearing machine 2,
The punching machine 3 punches into a shape in which the widths of a plurality of tip portions are narrowed in the width direction and is wound, or the rolling machine 4 subsequently rolls the punched portion into a taper shape in the plate thickness direction and then is wound. Alternatively, it may be wound as it is in the next step, or may be wound while being rolled by a rolling mill.

Furthermore, the punching shape of the punching machine 3 may be used for both the tip end portion and the tail end portion, but a more appropriate punching shape can be selected by providing a plurality of punching shapes. In this case, it is preferable that a shearing machine is also provided on the entrance side of the punching machine.

FIG. 4 is a diagram of another metal strip manufacturing apparatus of the present invention. Following the shearing machine 2 punching machine 3 of the apparatus of FIG. 3, a tip end heating device 6 is attached between constant load rolling machines 4.

The tip end heating device 6 may be provided only on the entrance side of the shearing machine 2 and / or the punching machine 3, or may be installed together with the entrance side of the constant load rolling machine 4. As for other devices or modes of usage, the same layout or usage as in the case of FIG. 3 is possible.

Whichever method is adopted, the volume to be heated is a fraction of 1 to 1/10 of the total width, so that the energy input can be reduced and the time required for heating can be shortened. can get.

FIG. 5 is a view of another metal strip having a tapered shape in which the widths of a plurality of tips are narrowed in the width direction at another longitudinal end of the present invention, which is machined by punching. As compared with the shape shown in FIG. 2, an inverted triangular shape or an arc shape is preferable as shown in FIG. 5 in terms of the effect of preventing the bite front end mark during rolling.

When the punched shape is used for both the tip and the tail, it is desirable that the shape after punching the tip and the tail is reversed.

FIG. 6 is a diagram showing an embodiment in which the metal strip according to the present invention is manufactured by rolling.
When applied to a steel strip of mm, the punched shape shown in FIG. 2 is rolled, and it is shown that the rolling load per unit width is almost proportional to the reduction amount (working amount). If the tip processing width shape is inversely proportional to the amount, taper processing can be performed with a substantially constant rolling load.

This shows that it is possible to significantly control the processing. That is, when tapering the entire width, it is necessary to change the roll gap to obtain a predetermined taper. Therefore, when the line speed is high, control responsiveness becomes a problem. Further, even in low speed machining, the control device is inevitably expensive.

On the other hand, according to this method, if the required rolling load is obtained in advance according to the hardness and thickness of the material,
By using the value to keep the rolling load constant at a predetermined value with a device such as hydraulic pressure in the rolling mill, the plate thickness corresponding to the working width can be automatically obtained. The rolling load does not have to be strictly constant, and even a slight change does not hinder the purpose of the present invention. FIG. 7 is an embodiment of a rolling mill having such a function of constant rolling load.

As a rolling mill for this purpose, a rolling load can be made constant by hydraulic pressure and a spring device, and a rolling mill utilizing a lever is used in order to reduce the total load for applying the rolling load as shown in FIG. May be.

FIGS. 9 and 10 are plate thickness distribution diagrams of steel strips produced by the constant load rolling in the production of the metal strip of the present invention, and the tapered shapes before rolling correspond to those in FIGS. 2 and 5, respectively. is there. Using the rolling machine with a roll diameter of 200 mm shown in FIG. 7, the roll gap is opened to a plate thickness of 1.6 mm or more,
Constant-decrease rolling was performed by a method of applying a hydraulic load between the work rolls with a decree bender. The total width of the steel strip at this time is 2
At 00 mm, the maximum rolling load was about 20 Ton.

FIG. 9 shows a trapezoid in which the widths of the two tips are narrowed in the widthwise direction of the longitudinal end of the steel strip, and the width 5 of the upper side of the trapezoid is set.
The height is 40 mm, the width of the base is changed to 30 to 50 mm, and the trapezoid is straight with a rolling load of 10 Ton. The plate thickness tends to suddenly increase near the bottom of the trapezoid, but a good tapered shape was obtained as a taper shape against lap marks with a rolling load of 1/20 of the conventional full width rolling.

Under the conditions as shown in the figure, when the total width of the tip is 1/10 of the original width, the rolling load is 1 m of the original width.
At that time, it becomes about 88 tons, which is a very small structure as a rolling mill. That is, according to this method, the rolling load at the time of rolling can be reduced, and the taper can be very easily performed.

FIG. 10 shows a trapezoid in which the widths of the two tips are narrowed in the widthwise direction of the longitudinal ends of the steel strip, and the width of the upper side of the trapezoid is 5 mm, the height of the trapezoid is 40 mm, and the width of the base of the trapezoid is 40 mm. 3
It is 0 mm, and the trapezoidal space is an inverted triangle for the reason described in FIG. 5, and is rolled with a rolling load of 10 to 20 Ton. The taper shape can be gently adjusted by the rolling load, and a taper shape with a good plate thickness was obtained with a rolling load of 1/20 to 1/10 of the conventional full width rolling as a measure against lap marks.

FIG. 11 is another general view of the metal strip manufacturing apparatus of the present invention. 1 is a metal strip, 7 is a clamp for fixing the metal strip, 8 is an anvil, 4 is an overall view of the planetary rolling mill, 3
Is a punching machine. This equipment rolls between the rolling mill with a half structure on one side of the planetary rolling mill and the anvil that is fixed to the other side through the tip of the metal strip. Compared with the equipment, it requires a smaller load, and since only one side is required, a small equipment is required. That is, since the processing roll takes a form in which the surface of the metal strip is processed while rolling, it is not necessary to move the metal strip according to the rotation of the roll, and since the roll diameter is small, the rolling load is small, By rotating the planetary roll of the book, it is possible to perform the machining multiple times with one revolution.

Further, by making the width of the rolling device narrower than the width of the metal strip, it is possible to further reduce the rolling load. At the same time, the rolling area can be reduced and the rolling can be performed in comparison with the cutting process. It's a short time. That is, even if the rolling is partially repeated in the width direction, the processing is completed in a relatively short time. Further, since the roll rolls in the longitudinal direction of the steel strip, the material flow has a component in the longitudinal direction and can be processed without difficulty.

FIG. 12 is a diagram of an embodiment of the rolling shown in FIG. By tilting the rolling device in the direction of rotation in the horizontal plane as shown in FIG. 12, it is possible to easily adjust the processing length of the tapered shape and to cope with various metal strip dimensions. Furthermore, when a longer taper is required, the movement processing in the width direction is performed by moving the material in the longitudinal direction,
This can be achieved by changing the roll gap and repeating two or more times. Rotating direction of rolling device in horizontal plane and
It is a method capable of responding to various processing requests, by making it possible to adjust the processing form and the processing length of the tapered shape by inclining β with respect to the vertical direction and rolling.

FIG. 13 is a taper processing length and lap mark generation tendency diagram in which the invention of FIG. 10 is applied to the tip processing of a steel strip. However, the taper processing length can be properly taken and no lap mark is generated. I understand.

There may be inspection, oiling, plating, painting, slitting, side trimming, insertion of interleaving paper, etc. between the manufacturing device for processing into a tapered shape and the winding device, and processing is performed in the vicinity of winding. May be. Further, the processing may be performed on the same line, a plurality of lines may be processed offline, or the tail end may be processed in the previous process.

The lap mark has a close relationship with the taper shape of the plate thickness and the winding direction. For example, by processing the plate thickness on the take-up reel surface side of the leading end of the metal strip to taper in the longitudinal direction, The present invention can be applied to a case where the tip end of metal is deformed along the second and subsequent windings by utilizing the rigidity to gently reduce the surface pressure.

Further, the winding direction of the metal strip is determined in consideration of the relation with the next process or the unwinding direction of the customer, and therefore it cannot be determined only by the arrangement of the metal strip manufacturing apparatus. . Therefore, in consideration of the winding direction of the line, the tip or tail end of the metal band should be processed outside the line in advance to match it, or after the front and back sides are reversed in the line, it should be processed. It is also applicable in the case.

[0058]

INDUSTRIAL APPLICABILITY The metal strip of the present invention is most suitable for preventing lap marks during winding in the metal strip treatment process or the next and next metal strip treatment processes, and the occurrence of top marks is prevented. It is possible to prevent it, improve product quality, and save resources, which will bring great industrial benefits. Further, the manufacturing is also possible with a high yield, low load, high speed, and inexpensive processing equipment.

[Brief description of drawings]

FIG. 1 is a comparison diagram of lap mark lengths of a steel strip of the present invention and a steel strip of a comparative example.

FIG. 2 is a drawing of the as-punched metal strip of the present invention.

FIG. 3 is a drawing of a metal strip manufacturing apparatus according to the present invention in which punching and rolling are consecutively provided.

FIG. 4 is a drawing of a metal strip manufacturing apparatus in which a tip heating device is arranged in another embodiment of the present invention.

FIG. 5 is a view of a metal strip having a tapered shape in which the width of another tip portion of the present invention is narrowed.

FIG. 6 is a diagram showing an example in which the metal strip production of the present invention is performed by rolling, and shows that the rolling load per unit width is almost proportional to the reduction amount.

FIG. 7 is a view of a constant load rolling machine for producing the metal strip of the present invention.

FIG. 8 is a view of another constant load rolling machine for producing the metal strip of the present invention.

9 is a plate thickness distribution diagram of a steel strip obtained by rolling the tapered shape of FIG. 2 under constant load.

10 is a plate thickness distribution diagram of a steel strip obtained by rolling the tapered shape of FIG. 5 under constant load.

FIG. 11 is a drawing of a metal strip manufacturing apparatus equipped with an apparatus having a half structure on one side of a planetary rolling machine as a rolling machine in another embodiment of the present invention.

FIG. 12 is a diagram illustrating an example of rolling of FIG. 11.

FIG. 13 is a taper processing and lap mark generation tendency diagram of one embodiment of the present invention.

[Explanation of symbols]

 1 metal strip. 2 shears. 3 punching machine. 4 Constant load rolling mill. 5 Winder. 6 Tip heating device. 7 clamps. 8 anvils. 9 Planetary roll of planetary rolling machine. 10 Backup roll for planetary rolling mill.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumio Kakuhari, 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. Nippon Steel Tube Co., Ltd. (72) Inventor Ryoichiro Takahashi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd.

Claims (3)

[Claims] 1. A metal strip, characterized in that one or more of the longitudinal ends of the metal strip are provided with a shape such that the widths of a plurality of tips are narrowed in the width direction. 2. One or more ends of a plurality of triangular shapes, trapezoidal shapes, arc shapes, shapes similar to these, or combinations thereof, or a mixed shape thereof in one or more of the longitudinal ends of the metal strip. A metal band characterized by having a partial shape. 3. One or more ends of a plurality of triangular shapes, trapezoidal shapes, arc shapes, shapes similar to these or combinations thereof, or a mixed shape thereof in one or more of the longitudinal ends of the metal strip. A metal strip having a partial shape, wherein at least one of the longitudinal ends has a taper thickness in the longitudinal end direction.