JP7311774B2 - Zn-Al wire supply device and Zn-Al wire supply method - Google Patents

Description

The present invention relates to a Zn-Al wire supply device and a Zn-Al wire supply method for supplying a Zn-Al wire to a molten zinc bath.

In order to stabilize the quality of galvanized steel sheets, it is necessary to strictly control the Al concentration in the molten zinc bath. This is because if the Al concentration is too high, poor alloying occurs, and if the Al concentration is too low, bottom dross is generated and accumulated in the bath and adheres to the steel sheet, resulting in dross flaws.

At present, the Al concentration in the molten zinc bath is adjusted by intermittently inserting small ingots of Zn-Al alloy into the surface layer of the molten zinc bath (manual injection by an operator). However, in this method, Al concentration fluctuates over time due to intermittent Al supply, and small ingots of Zn-Al alloy, which has a lower density than molten zinc, are supplied from the surface of the molten zinc bath. Therefore, Al concentrates in the surface layer of the molten zinc bath (difficult to diffuse into the deep part of the molten zinc bath), and variations in Al concentration occur in the depth direction of the molten zinc bath. Strict control of the Al concentration in the molten zinc bath is difficult due to these Al concentration fluctuations and Al concentration variations, and the strip is forced to be run at a reduced speed so as not to cause quality defects such as poor alloying and dross defects. etc., which impedes productivity.

Techniques for suppressing these fluctuations in Al concentration and variations in Al concentration are required. A method was proposed to suppress fluctuations in the Al concentration and variations in the Al concentration by supplying the Al concentration to a depth of several hundred mm.

Japanese Patent No. 5423929 JP 2018-184630 A

In this method, it was thought that the main body of the Zn-Al wire feeder should be installed near the molten zinc bath. However, if the main body of the Zn-Al wire supply device is installed near the molten zinc bath, operator work around the molten zinc bath (dross removal work, maintenance of molten zinc bath peripheral equipment, etc.) and operation of other devices, etc. problems such as interfering with Therefore, it has become necessary to place the main body of the Zn-Al wire supply device in a position (away from the molten zinc bath) that does not interfere with the operator's work performed around the molten zinc bath or the operation of other devices.

In response to this request, the inventor tried to arrange the main body of the supply device that supplies the Zn-Al wire at a position away from the molten zinc bath, but due to deviation of the Zn-Al wire, etc., it was possible to stably supply the molten zinc bath. could not.

The present invention is an invention made against such a background, and the problem to be solved by the present invention is to provide a Zn-Al wire feeder that supplies Zn-Al wire without arranging it in the vicinity of the molten zinc bath. The purpose is to stably supply the Al wire to the molten zinc bath.

In order to solve the above problems, there is provided a wire feeder for feeding a Zn-Al wire to a molten zinc bath, wherein the Zn-Al wire extruded from the feeder main body has an inner diameter of Zn-Al before it is fed to the molten zinc bath. The wire feeding device is characterized by passing it through a guide pipe having a diameter of 4 times or more and 10 times or less of the diameter of the Al wire.

Further, it is preferable to provide a bending portion for changing the traveling direction of the Zn-Al wire extruded from the supply device main body, and to set the bending angle of the bending portion to 90 degrees or less.

Moreover, it is preferable to set the radius of curvature of the bent portion to 100 mm or more.

In addition, it has a plurality of bending parts that change the traveling direction of the Zn-Al wire extruded from the main body of the supply device, the distance between each adjacent bending part is 200 mm or more, and a straight guide pipe is provided between each adjacent bending part. It is preferable to set it as the structure provided.

In addition, it is preferable that at least one bending portion has a configuration in which a wire is passed between guide rollers and bent.

Moreover, the number of guide rollers is preferably four or more for each bending portion provided with guide rollers.

Moreover, it is preferable that the Zn-Al wire supply method is characterized by supplying the Zn-Al wire to the molten zinc bath using such a wire supply device.

According to the present invention, the Zn-Al wire can be stably supplied to the molten zinc bath without arranging the main body of the supply device for supplying the Zn-Al wire in the vicinity of the molten zinc bath.

FIG. 4 is a side view showing an example in which a supply device main body is arranged at a location away from the molten zinc bath; FIG. 2 is a plan view around the wire feeder shown in FIG. 1; It is a figure showing the bending angle of the bending part provided in the guide pipe. It is a figure which shows the example which used the guide roller for the bending part. It is a figure showing the distance between bending parts.

Modes for carrying out the invention are shown below. As can be seen from FIGS. 1 and 2, the wire feeder 1 of this embodiment feeds the Zn--Al wire 7 to the molten zinc bath 8. As shown in FIG. This wire feeder 1 feeds the Zn-Al wire 7 extruded from the feeder main body 10 to the molten zinc bath 8. Pass through pipe 3. Therefore, the Zn-Al wire 7 can be stably supplied to the molten zinc bath 8 without disposing the supply device main body 10 for supplying the Zn-Al wire 7 near the molten zinc bath 8 . Moreover, if the Zn-Al wire 7 is supplied to the molten zinc bath 8 using such a wire supply device 1, the fluctuation of the Al concentration in the molten zinc bath 8 due to the supply of the Zn-Al wire 7 and the Al concentration can be suppressed.

The supply device main body 10 feeds out the Zn--Al wire 7. As shown in FIG. In the example shown in FIGS. 1 and 2, the stored Zn--Al wire 7 is extruded from between the drive roll 11 and the pinch roll 12. FIG. In an embodiment, the Zn-Al wire 7 can be extruded from between the drive roll 11 and the pinch roll 12 by rotating the motor-driven drive roll 11 . 1 and 2, the Zn-Al wire 7 is gradually introduced from a fiber drum or the like equipped with the wound Zn-Al wire 7, and the Zn-Al wire 7 is guided. Send out to pipe 3.

By the way, it is difficult to install the supply device main body 10 around the molten zinc bath 8 because it may hinder the work around the molten zinc bath 8 and the operation of other devices. Further, even if the supply device main body 10 can be installed around the molten zinc bath 8, the supply device main body 10 receives a heat load from the molten zinc bath 8, so cooling measures and the like are required, which increases the cost of the device. There's a problem. Further, when the supply device main body 10 is installed around the molten zinc bath 8, the work environment for wire replacement (replenishment) of the supply device main body 10 and maintenance work becomes poor.

For this reason, it is necessary to install the supply device main body 10 at an arbitrary position that does not cause the above problem. The distance to the zinc bath 8 increases, the number of times of bending increases, and the like, making it difficult to stably supply the wire. In order to improve this point, in the present invention, the Zn-Al wire 7 is supplied through the guide pipe 3 whose inner diameter is 4 times or more and 10 times or less the wire diameter. The reason why the Zn-Al wire 7 is passed through the guide pipe 3 is to prevent the Zn-Al wire 7 from being deviated or loosened. The reason why the inner diameter of the guide pipe 3 is 4 times or more and 10 times or less than the diameter of the Zn-Al wire 7 is to achieve a reduction in resistance, suppression of slackness, and the like. If the inner diameter is too small (less than 4 times the diameter of the Zn-Al wire 7), the frictional resistance between the Zn-Al wire 7 and the guide pipe 3 increases, and the inner diameter is too large (10 times the diameter of the Zn-Al wire 7). ), the Zn-Al wire 7 tends to loosen.

The wire feeder 1 does not necessarily have the bent portion 18 for changing the traveling direction of the Zn-Al wire 7, but if the bent portion 18 is provided, the bent portion 18 should be bent at an angle of 90 degrees in order to reduce the resistance. or less, or the radius of curvature of the bent portion 18 is preferably 100 mm or more. If the bending angle is too large (more than 90°), the frictional resistance of the bent portion 18 will increase, and if the curvature radius is too small (less than 100 mm), the bending resistance of the Zn-Al wire 7 will increase, and the Zn-Al wire This is because the frictional resistance after the bent portion 18 increases due to the peculiarity of the portion 7 . As understood from FIG. 3, the bending angle of the bent portion 18 represents how much the angle of the Zn--Al wire 7 can be changed from the straight state.

Moreover, as can be understood from FIG. 4, it is preferable that the Zn--Al wire 7 is passed between the guide rollers 19 and bent at the bending portion 18 . This is because the frictional resistance generated at the bent portion 18 can be reduced as compared with the case where the Zn-Al wire 7 moves while rubbing against the guide pipe 3 . It should be noted that the guide rollers 19 do not have to be provided in all the bent portions 18, and the effect of reducing the frictional resistance can be obtained as long as they are provided in at least one of the bent portions 18. FIG. A typical example of the guide roller 19 is a roller with a ball bearing, but the guide roller 19 is not limited to a roller with a ball bearing.

The number of the guide rollers 19 is preferably four (two pairs) or more for each bending portion 18 provided with the guide rollers 19 . This is because if the number of guide rollers 19 is too small (less than four), the Zn--Al wire 7 is likely to be deviated or loosened.

In addition, a plurality of bending portions 18 are provided to change the traveling direction of the Zn-Al wire 7 extruded from the supply device main body 10. Preferably, the wire feeding device 1 is provided with a guide pipe 3 having a shape. As can be seen from FIG. 5, the distance between each bent portion 18 is the distance from the beginning of bending at one bending portion 18 to the end of bending at the next bending portion 18. is.

If the bent portions 18 are too close to each other (less than 200 mm), the distortion of the wire at the previously passed bent portion 18 cannot be sufficiently corrected, and the bending resistance and frictional resistance at the later passed bent portion 18 are large. However, by adopting such a configuration, the kinks of the wire generated at the upstream bent portion 18 can be loosened up to the downstream bent portion 18, and bending resistance and frictional resistance can be suppressed. can. The length of the linear portion of the guide pipe 3 positioned between the bent portions 18 is preferably 200 mm or more.

By the way, the Zn-Al wire 7 is an alloy wire containing necessary amounts of Zn and Al. The Zn-Al wire 7 preferably contains 60% by mass or more of Zn and 5% by mass or more of Al. Further, Al is more preferably 6% by mass or more and 15% by mass or less.

Next, examples will be described. In this example. A feeder body 10 as shown in FIGS. 1 and 2 is arranged at a location away from the molten zinc bath 8 . By changing conditions such as the diameter of the Zn-Al wire 7, the inner diameter of the guide pipe 3, the number of bent portions 18, the total length, etc., it was determined whether the Zn-Al wire 7 could be stably supplied to the molten zinc bath 8. confirmed. Table 1 shows the results.

As in Comparative Examples 1 and 2 in Table 1, when the inner diameter of the guide pipe 3 used does not satisfy the condition that the diameter of the Zn-Al wire 7 is 4 times or more and 10 times or less, the Zn-Al wire 7 could not be stably supplied to the molten zinc bath 8. On the other hand, as shown in Examples 1 to 3, when the inner diameter of the guide pipe 3 used satisfies the condition that the diameter of the Zn-Al wire 7 is 4 times or more and 10 times or less, the Zn-Al wire 7 is melted. A stable supply to the zinc bath 8 was possible.

In Comparative Example 3, in which the bending angle of the bending portion 18 provided in the wire supply device 1 was not 90 degrees or less, the Zn-Al wire 7 could not be stably supplied to the molten zinc bath 8 . On the other hand, in Example 1, etc., in which the bending angle of the bent portion 18 was 90 degrees or less, the Zn-Al wire 7 could be stably supplied to the molten zinc bath 8 .

In Comparative Example 4 in which the curvature radius of the bent portion 18 was not 100 mm or more, the Zn-Al wire 7 could not be stably supplied to the molten zinc bath 8 . On the other hand, in Example 1, etc., in which the radius of curvature of the bent portion 18 was 100 mm or more, the Zn-Al wire 7 could be stably supplied to the molten zinc bath 8 .

In Comparative Example 5 in which the interval between the bent portions 18 was less than 200 mm, the Zn-Al wire 7 could not be stably supplied to the molten zinc bath 8 . On the other hand, in Example 8, etc., in which the interval between the bent portions 18 was 200 mm or more, the Zn-Al wire 7 could be stably supplied to the molten zinc bath 8 .

In addition, as a result of experiments under various conditions, such as increasing the number of bends 18 and increasing the total length, it seems that it is relatively difficult to feed the Zn-Al wire 7 if the predetermined conditions are met. It was found that the Zn-Al wire 7 can be stably supplied to the molten zinc bath 8 even in a harsh environment.

Although the present invention has been described above with a focus on the embodiments, the present invention is not limited to the above embodiments, and various aspects are possible.

1 wire supply device 3 guide pipe 7 Zn-Al wire 8 molten zinc bath 10 supply device main body 18 bent portion 19 guide roller

Claims (7)

A Zn-Al wire supply device for supplying a Zn-Al wire to a molten zinc bath,
comprising a plurality of bending portions for changing the traveling direction of the Zn-Al wire extruded from the feeder main body, and configured so that adjacent bending portions bend the Zn-Al wire in different directions;
Zn, wherein the Zn-Al wire extruded from the supply device body is passed through a guide pipe having an inner diameter of 4 times or more and 10 times or less than the diameter of the Zn-Al wire before being supplied to the molten zinc bath. -Al wire feeder. 2. The Zn-Al wire feeder according to claim 1, wherein the bending angle of said bending portion is 90 degrees or less. 3. The Zn-Al wire feeder according to claim 2, wherein the radius of curvature of said bent portion is 100 mm or more. 4. The Zn-Al wire feeder according to claim 3, characterized in that the distance between each adjacent bent portion is 200 mm or more, and a straight guide pipe is provided between each adjacent bent portion. 5. The Zn-Al wire feeder according to claim 3 or 4, wherein the wire is passed between guide rollers and bent in at least one bending portion. 6. The Zn-Al wire feeder according to claim 5, wherein the number of guide rollers is four or more for each bending portion provided with guide rollers. A method of supplying a Zn-Al wire, comprising supplying a Zn-Al wire to a molten zinc bath using the wire supplying apparatus according to any one of claims 1 to 6.