JP3324503B2 - Metal strip winding method and winding apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for winding a metal band, and more particularly, to a method for winding a metal band with a mandrel having a grip portion for biting the front end of the metal band. The present invention relates to a method and an apparatus for winding a metal band while reducing the generation of grip marks in the vicinity.

[0002]

2. Description of the Related Art When a steel strip is wound around a coil using a mandrel having a grip portion on an outer peripheral surface for engaging a tip end of a metal strip (hereinafter, a "steel strip" is taken as an example). When the steel strip tip is inserted into the grip and winding is started, a plate convex shape is inevitably generated because the bending stress concentrates on the part immediately after the tip inserted in the grip. I do. For this reason, the first and second turns of the steel strip
A contact mark called a grip mark is generated between the turn and the turn.

When the grip mark is formed deeply in the steel strip, the portion where the grip mark is formed must be cut off, which causes a reduction in the yield of the steel strip. Therefore, various measures for preventing grip marks have been conventionally proposed.

For example, Japanese Unexamined Patent Publication (Kokai) No. 59-1019 discloses that a cushioning material such as cardboard is inserted into the steel strip winding surface at the overlapping position of the steel strip tip at the beginning of winding and the steel strip of the next winding. In addition, a method has been proposed in which the generation of grip marks is absorbed by a cushioning material.

Japanese Patent Application Laid-Open No. 6-246345 discloses that FIG.
As shown in (1), when the steel strip 2 is wound on the tension reel 1 including the tension reel shaft 1a and the winding sleeve 1b, the tension to be applied is controlled in accordance with the thickness of the steel strip 2 in the initial winding. The sink depth h of the tip of the steel strip into the grip portion 3 formed on the winding sleeve 1b is set to 0.
A method of reducing grip marks by adjusting the range of 5 to 1.0 times has been proposed.

Further, Japanese Utility Model Laid-Open No. 2-118612 discloses a grip portion 5 into which the tip of a steel strip 4 is inserted, as shown in FIG. 7 and FIG. 8 which is an enlarged view of a portion A in FIG. Is provided, the radius of curvature of the outer peripheral surface of the segment 7 close to the grip portion 5 is minimized in the vicinity of the grip portion 5, gradually increased through a plurality of inflection points in the circumferential direction, and finally increased. By being configured to be continuous with the radius of the mandrel 6, the bending stress acting on the steel strip 4 is dispersed,
Mandrels that reduce grip marks have been proposed. In the drawings, reference numeral 8 denotes a grip bar, and reference numeral 9 denotes a segment.

[0007]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No.
In the method proposed in Japanese Patent Publication No. 19, a cushioning material must be inserted for each turn, which lowers productivity and increases cost. When cardboard is used as a cushioning material, the cardboard itself breaks and the board thickness is 1.
With thin steel strips of 6 mm or less, grip marks are generated from the folded part of the cardboard, and grip marks cannot be reliably suppressed.

The method proposed in Japanese Patent Application Laid-Open No. Hei 6-246345 is a method that is effective in the case of a belt wrapper type winding device as shown in FIG.
That is, in this method, the initial tension applied in the belt wrapper method is set to be larger than the steady winding tension, thereby sinking the steel strip tip into the winding sleeve at the beginning of winding. Therefore, when this method is applied to, for example, the mandrel 6 having the grip portion 5 shown in FIGS. 7 and 8, the higher the initial tension, the more the pulling force is applied to the grip bar 8 than to the force holding down the steel strip. And the steel strip 4 comes off from the grip portion 5. The first volume is segment 7
Is attached to the outer peripheral surface of the first roll, and receives the fine irregularities on the surface 7a, and the irregularities are transferred when the second winding is wound. Similarly, when the second volume is wound with the first volume stuck to the outer peripheral surface of the segment 9, a gap B is generated between the segments 7 and 9, and a fold mark is formed at the tip C of the segment 9. Will occur in reverse.
Therefore, even if this method is applied to the mandrel 6 having the grip portion 5, it is difficult to suppress the grip mark.

Further, the invention proposed in Japanese Utility Model Laid-Open No. 2-118612 discloses a segment 7 close to the grip portion 5.
By optimizing the shape of the outer peripheral surface of the
To disperse the bending stress given to the steel strip 4 from the above. However, according to the knowledge of the present inventors, depending on winding conditions such as initial tension conditions at the time of winding, Japanese Patent Laid-Open No.
As with the mandrel described in Japanese Patent Publication No.
Of the steel strip 4 from the steel strip 4, transfer of irregularities on the surface 7 a of the segment 7 to the surface of the steel strip 4,
In such a case, a problem such as generation of a fold mark at the front end portion C occurs, and the grip mark cannot be reliably suppressed.

[0010] Here, an object of the present invention is to provide a mandrel having a grip portion for biting the tip of a metal strip.
The occurrence of grip marks near the tip of the metal strip,
An object of the present invention is to provide a winding method and a winding device for a metal band that can be wound while the metal band is substantially eliminated to the extent that it cannot be visually determined.

[0011]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and have found that the present invention has been described in Japanese Patent Application Laid-Open No. 2-118612.
By reducing the grip mark by dispersing the bending stress acting on the steel strip by changing the shape of the segment close to the grip part proposed by the publication, and disposing a holding roll near the mandrel, By combining the pressing roll with pressing the coil at the beginning of winding, it is possible to wind the metal strip while substantially eliminating the occurrence of grip marks to such an extent that it cannot be determined visually. Having found out, the present invention has been completed.

Here, the gist of the present invention is that the front end of the metal strip has a grip portion provided on a part of the outer peripheral surface thereof, and the curvature of the outer peripheral surface in a small area adjacent to the grip portion. After the radius is bitten into the grip portion of the mandrel formed so that the radius gradually increases from the minimum value to the mandrel radius in the direction opposite to the mandrel rotation direction, the pressing roll is pressed onto the outer peripheral surface on the mandrel rotation direction side of the grip portion. 15-20N / mm
The mandrel is rotated while pressing with pressure, and the presser roll is released from the mandrel immediately after the grip portion passes through the presser roll, and 1.5 to 2 windings are performed on the mandrel while loosening the metal band. the winding wound around the mandrel while adding tension to the band, tension
Is gradually increased while the metal strip is wound.

[0013]

Further, from another viewpoint, the present invention has a grip portion for engaging a tip end of a metal band in a part of the outer peripheral surface, and has a radius of curvature of the outer peripheral surface in a small area adjacent to the grip portion. However, in the opposite direction of the mandrel rotation direction, a mandrel formed so as to gradually increase from the minimum value to the mandrel radius, a tension control mechanism for the metal band wound on the mandrel, and a grip when the tip bites and a contact freely the installed hold-down roll on the outer peripheral surface of the mandrel rotation direction side than the position of the parts, the metal strip
After holding the tip of the
While pressing it against the outer peripheral surface with a pressing pressure of 15-20 N / mm.
Rotate the drel to move the grip part through the presser roll.
Release the presser roll from the mandrel immediately after
Mandrel with slack in metal band by mechanism
After 1.5 to 2 windings, the metal band is stretched.
Take up the winding around the mandrel while applying force,
This is a winding device for a metal band, which is performed while gradually increasing the force .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a method and an apparatus for winding a metal band according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiment, the case where the metal strip is a steel strip is taken as an example, but the present invention can be similarly applied to other metal strips such as an aluminum alloy strip.

FIG. 1 is an explanatory diagram schematically showing a skin pass line 10 to which a winding device 11 of the present embodiment is applied. In the figure, a steel strip 13 that has been flattened by a skin pass mill 12 is sent to a deflector roll 15 via a bridle roll group 14. Thereafter, the steel strip 13 is wound around a coil by a tension reel 16 which is a mandrel. By providing a difference between the rotation speeds of the skin pass mill 12 and the tension reel 16, the tension on the steel strip 13 is controlled between the bridle roll 14 and the tension reel 16, and set to a desired tension value. . In addition, since this tension control mechanism is publicly known, description thereof will be omitted. Reference numeral 19 in FIG. 1 is a guide table for guiding the tip of the steel strip 13 to the tension reel 16.

FIG. 2 is a perspective view showing a main part of the winding device 11 according to the present embodiment. As shown in FIG. 1, the winding device 11 of the present embodiment includes a tension reel 16 and a pressing roll 17 that is disposed so as to be in contact with the tension reel 16.
And the bridle roll 14 and the tension reel 16 described above.
And a tension control mechanism (not shown). Hereinafter, the tension reel 16 and the presser roll 17 will be described.

[Tension Reel 16] The tension reel 16, which is a mandrel in the present embodiment, is briefly described as follows.
Japanese Utility Model Application Laid-Open No. 2-1186 described with reference to FIGS.
This is the same as the mandrel 6 having the grip portion 5 and the segment 7 proposed by Japanese Patent Publication No.

That is, the tension reel of the present embodiment
16 has a grip portion 5 for biting the tip of the steel strip 13 into a part of the outer peripheral surface, and the radius of curvature of the outer peripheral surface 7a in a small area adjacent to the grip portion 5 is opposite to the mandrel rotation direction. 2 (in the direction of the white arrow in FIG. 2), it is formed so as to gradually increase from the minimum value to the mandrel radius.

In the tension reel 16 of the present embodiment, the radius of curvature is changed as described above by mounting the segment 7 on the mandrel 6 and appropriately setting the shape of the segment 7, but the present invention is limited to this mode. It is not what you need to do. As described above, the tension reel 16 is known from Japanese Utility Model Laid-Open No. 2-118612, and further description will be omitted.

[Pressing Roll 17] In this embodiment, a pressing roll 17 is provided. As shown in FIG. 2 and FIG. 3 (b), which will be described later, the presser roll 17 abuts on the outer peripheral surface on the mandrel rotation direction side of the position of the grip portion 5 when the distal end portion 13a of the steel strip 13 is inserted. The tension reel 16 is arranged at a position where the tension reel 16 can be in contact therewith.

The press roll 17 may be a normal flat roll.
The roll body length is equal to or longer than the entire width of the steel strip 13. In the present embodiment, the outer diameter of the press roll 17 is 200 to 300 mm.

The holding roll 17 is provided with a suitable lifting mechanism 18.
The shaft is supported to be able to move up and down freely. In the present embodiment, the supporting frame 18a that supports the presser roll 17, a connecting arm 18b having one end fixed to the supporting frame 18a, and a lifting motor 18c fixed to the other end of the connecting arm 18b raise and lower. mechanism
18 are configured. By driving the elevating motor 18c, the connecting arm 18b is rotated, whereby the supporting frame 18a is rotated.
The presser roll 17 supported by the shaft moves up and down in an arc shape in the direction of both arrows.

By the lifting mechanism 18, the presser roll 17 is pressed against the tension reel 16 at a pressure of 15 to 20 N / mm.
Pressed. The winding device 11 of the present embodiment is configured as described above. Next, the operation of the winding device 11 of the present embodiment, that is, the winding method of the present embodiment will be described.

FIGS. 3 (a) to 3 (f) are explanatory views showing the operation of the winding device 11 of the present embodiment over time. Also,
FIG. 4 shows the skin pass mill 1 in the skin pass line 10.
2 is an example of a time chart showing a start timing and a stop timing of each tension reel 16.
Note that reference numerals (a) to (f) in FIG.
(f) respectively. Hereinafter, description will be made with reference to FIGS. 3 and 4.

In FIG. 3A, the skin pass mill 12 is activated, and the tip 13a of the steel strip 13 is guided along the guide table 19 toward the grip portion 5 of the tension reel 16. At this time, as shown in FIG.
16 is stopped. The skin pass mill 12 is
Stops at the timing immediately before the tip 13a of the first member 13 reaches the grip portion 5.

In FIG. 3B, the tip 13a of the steel strip 13 bites into the grip portion 5. Thereafter, the tension reel 16, the lifting mechanism 18, and the skin pass mill 12 are simultaneously activated. Thus, as shown in FIG. 3B, the pressing roll 17 is pressed against the rotating tension reel 16 on the outer peripheral surface on the mandrel rotation direction side of the grip portion 5. Then, as shown in FIG. 3C, the grip portion 5 passes through the presser roll 17 as the tension reel 16 rotates.

By pressing the presser roll 17 against the tension reel 16, a low value bending stress is applied to the steel strip 13 without using a tension, so that the plastic deformation rate is within 50% instead of the complete plastic deformation. be able to. From such a viewpoint, the pressing pressure is desirably 15 to 20 N / mm. Thereby, the subsequent loosening can be smoothly performed, and the initial tension value at the time of loosening can be suppressed to 10% or less. On the other hand, if the pressing pressure deviates from 15 to 20 N / mm, the steel strip 13 cannot be given a bending stress having a low value as described above, and
Cannot be wound neatly along the outer peripheral surface of the segment 7, and the grip mark cannot be eliminated. This is particularly noticeable in the case of a steel strip having a thickness of more than 3.0 mm.

In FIG. 3D, immediately after the grip portion 5 has passed the presser roll 17, the presser roll 17 is raised, and the tension reel 16 is temporarily stopped for a short time and then restarted.

The timing for raising the presser roll 17 is as follows.
This may be performed immediately after the grip portion 5 has passed through the presser roll 17. For example, it is desirable to perform this operation when the approximate center position of the segment 7 in the mandrel rotation direction reaches the presser roll 17. If the timing for raising the presser roll 17 is too late, concavities and convexities on the outer peripheral surface of the segment 7 will be transferred to the surface of the steel strip 13, and the generation of grip marks will be promoted.

The reason why the tension reel 16 is temporarily stopped for a short time is to drive the skin pass mill 12 only for a short time to surely cause the steel strip 13 to loosen. Depending on the degree, the tension reel 16 may be kept rotating.

Referring to FIG. 3E, the steel strip 13 is loosened around the tension reel 16 while being slackened. This winding is performed by rotating each of the skin pass mill 12 and the tension reel 16 and moving the steel strip 13 to the tension reel 16 for 1.5 times.
This is performed by winding up to two turns.

The unwinding is performed in order to prevent the steel plate 13 from coming off the grip portion 5 when tension is applied to the tension reel 16. That is, if the number of turns is less than 1.5, the steel strip 13 comes off from the grip portion 5 at the time of winding, and the bent portion of the steel strip 13 is displaced, so that the grip mark reducing effect is lost. Also, the part where the steel strip 13 came off is
Severe oyster flaws cause the appearance quality of the steel strip 13 to be extremely deteriorated. On the other hand, if the number of windings exceeds two, although it is effective in reducing grip marks, the steel windings 13 rub against each other at the time of loosening due to the increase in the number of windings.
Scratch and oyster flaws frequently occur on the surface of 13, which in turn lowers the yield of steel strip 13.

Then, while winding the steel strip 13 around the tension reel 16 while applying tension thereto, winding is performed.
In the present embodiment, as shown in FIG. 3 (f), both the skin pass mill 12 and the tension reel 16 are stopped, and then the tension reel 16 is restarted for a short time, so that the slack is gradually loosened. After this time, the control for the tension reel 16 is switched from the rotation speed control to the tension control, and winding is performed. However, the tension value set at this time is about 1/10 of the steady value. As a result, when the tension reel 16 is rotated, tension is suddenly applied to the steel strip 13, and the impact force at that time causes the unevenness of the outer peripheral surface of the segment 7 to be transferred to the steel strip 13, causing the generation of grip marks. Connection is prevented. After the slack removal is completed, the skin pass mill 12 and the tension reel 16 are activated to apply tension, and the steel strip 13 is wound up through slow motion and operation.

As described above, according to the present embodiment, the bending stress acting from the segment 7 of the tension reel 16 is effectively dispersed in the steel strip 13 to be wound, and the steel strip 13 is placed on the outer peripheral surface of the segment 7. The steel strip 13 can be wound while the occurrence of grip marks is substantially eliminated to the extent that it cannot be visually determined.

[0036]

The present invention will be described in more detail with reference to examples. A steel strip is provided by a skin pass line 10 to which the winding device 11 of the present embodiment is applied as shown in FIGS.
13 (SPHC: thickness 2.3 mm, width 1219 mm) was wound around a coil.

That is, the steel strip 13 is guided along the guide table 19.
Was guided to the grip portion 5 of the tension reel 16, the steel strip 13 was sandwiched between the grip bars 8, and then the presser roll 17 was lowered and pressed against the tension reel 16 with a pressing force of 15 to 20 N / mm. Then, when the tension reel 16 was rotated to a position about half of the segment 7 with the presser roll 17 pressed, the presser roll 16 was raised.

Next, while the steel strip 13 was slackened, the tension reel 16 and the bridle roll 14 were simultaneously rotated in the normal direction, and 1.5 to 2 turns of the steel strip 13 were wound around the tension reel 16.

Then, the control of the tension reel 16 is switched from the rotation speed control to the tension control to change the tension reel 16 to the tension reel.
The steel strip 13 was loosened by rotating only 16. Thereafter, the tension was returned to the steady tension value, and the winding was performed.

FIG. 5 shows such an example of the present invention and a conventional example.
(Presser roll 13: unused, discarded: none, strain relief: speed control), and the results of measuring the grip mark curvature at each winding position are shown in graphs.

From the graph shown in FIG. 5, according to the example of the present invention,
It can be seen that the winding position: the fifth winding reduced the grip mark curvature by 55%, and the winding position: the tenth winding reduced the grip mark curvature by 57%. In addition, it can be seen that the grip mark was almost suppressed from the first volume to a level below the visually determinable level.

In the above examples of the present invention, the number of turns in the discarded winding was changed to less than 1.5 turns and more than 2 turns, respectively, and the influence of the number of discarded turns on the grip mark and the surface flaw was investigated. . The results are summarized in Table 1.

[0043]

[Table 1]

As shown in Table 1, when the number of discarded windings exceeds two,
Although effective in reducing the grip marks, the steel strip 13 and the steel strip 13 rub against each other during slack removal, resulting in a flaw and an oyster flaw. As a result, the yield of the steel strip 13 decreased.

On the other hand, in the case of less than 1.5 turns, the steel strip 13 came off from the grip portion 5 during winding, and the bent portion of the steel strip 13 was displaced, so that a grip mark was generated on the steel strip 13. In addition, the portion where the steel strip 13 came off became severe nicks, and the appearance quality of the steel strip 13 was extremely deteriorated.

[0046]

As described above in detail, according to the present invention, it is possible to wind a metal band while substantially eliminating the occurrence of grip marks when winding the metal band to such an extent that it cannot be visually judged. Therefore, product defects of the metal strip are reduced, and both the quality and yield of the metal strip can be significantly improved. The significance of the present invention having such an effect is extremely remarkable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a skin pass line to which a winding device according to an embodiment is applied.

FIG. 2 is a perspective view extracting and showing a main part of the winding device of the embodiment.

FIGS. 3A to 3F are explanatory diagrams showing the operation of the winding device of the embodiment over time.

FIG. 4 is an example of a time chart showing a start timing and a stop timing of each of a skin pass mill and a tension reel in a skin pass line.

FIG. 5 is a graph showing a result in the example.

FIG. 6 is an explanatory view showing the invention proposed by Japanese Patent Application Laid-Open No. 6-246345.

FIG. 7 is an explanatory view showing a device proposed by Japanese Utility Model Laid-Open No. 2-118612.

FIG. 8 is an enlarged view of a portion A in FIG. 7;

[Explanation of symbols]

 5 Grip section 7 Segment 11 Winding device 12 Skin pass mill 13 Steel strip 14 Bridle roll 15 Deflector roll 16 Tension reel (mandrel) 17 Presser roll

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 47/06 B21C 47/02 B21C 47/32

Claims (2)

(57) [Claims] 1. A front end portion of a metal strip has a grip portion provided on a part of an outer peripheral surface thereof, and a radius of curvature of the outer peripheral surface in a small area adjacent to the grip portion is:
After being bitten into the grip portion of the mandrel formed so as to gradually increase from the minimum value to the mandrel radius with respect to the direction opposite to the mandrel rotation direction, the pressing roll is pressed against the outer peripheral surface on the mandrel rotation direction side of the grip portion. The mandrel is rotated while pressing with a pressing pressure of 15 to 20 N / mm, and immediately after the grip portion passes through the pressing roll, the pressing roll is separated from the mandrel, and the mandrel is provided while the metal band is slackened. And winding the mandrel while applying tension to the metal band while gradually increasing the tension after applying 1.5 to 2 windings to the metal band. Method. 2. A part of the outer peripheral surface has a grip portion for biting the tip of the metal band, and a radius of curvature of the outer peripheral surface in a small area adjacent to the grip portion is:
Regarding the direction opposite to the mandrel rotation direction, a mandrel formed so as to gradually increase from the minimum value to the mandrel radius, a tension control mechanism for a metal band wound around the mandrel, and the bite when the tip portion is bitten. A press roll provided so as to be able to abut on the outer peripheral surface on the mandrel rotation direction side of the grip portion, and after the tip of the metal band is bitten by the grip portion, the press roll is The mandrel is rotated while pressing against the outer peripheral surface with a pressing pressure of 15 to 20 N / mm, and immediately after the grip portion passes through the pressing roll, the pressing roll is separated from the mandrel, and the tension control mechanism causes the metal to be pressed. After performing 1.5 to 2 windings around the mandrel while slackening the band, the tension is applied to the metal band while the mandrel is wound. A winding device for winding a metal band, wherein winding of the metal belt is performed while gradually increasing the tension.