JPH09125297A - Electrolytic descaling method and device for wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for highly efficiently and sufficiently cleaning the surface of a wire supplied from a wire working device. SOLUTION: Winding parts are successively formed to the wire W and while the wire is transported by shifting these winding parts to one direction each and laminating the winding parts on each other (looped state), the wire is immersed in an electrolyte 21 contg. hydrofluoric acid and nitric acid. Current is passed via the electrolyte 21 between electrodes 24 to 25 arranged in the electrolyte 21 and the wire W, by which the surface of the wire W is electrolytically washed. The energization direction to the wire is inverted at prescribed periods by an energization control means.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method and apparatus for electrolytic descaling of wire.

[0002]

2. Description of the Related Art Conventionally, a wire rod such as a steel wire has been subjected to an acid pickling treatment in order to remove scale, dirt, and the like generated by processing such as drawing and rolling. Such pickling treatment,
As shown in FIG. 19, a coil 110 is formed by bundling wire rods, and the coil 110 is hung by a suspender 105 and immersed in a pickling solution 101 contained in a pickling treatment tank 100. There is. Further, when the scale layer to be formed is dense and strong, such as a stainless steel wire rod, the electrolytic acid treatment may be performed by energizing the coil 110.

[0003]

In the above-described method, the wire supplied from a wire processing device such as a rolling mill is once wound into a coil and then pickled by batch processing. There are bad drawbacks. Further, in a state where the wires are bundled in a coil shape, many overlapping portions are formed on the wires, so that it is difficult for the pickling liquid to penetrate into the gaps between the wires, so that there is a problem that the process takes a long time or the process becomes uneven.

An object of the present invention is to provide a method and an apparatus for highly efficiently and sufficiently cleaning the surface of a wire rod supplied from a wire rod processing apparatus.

[0005]

In order to solve the above problems, the electrolytic descaling method for a wire according to the present invention sequentially forms winding parts on the wire and unidirectionally forms the winding parts. While transporting them in a state of stacking them on top of each other (hereinafter referred to as “looplo state”), immerse them in an electrolytic solution containing hydrofluoric acid and nitric acid, and perform electrolysis between the electrode and the wire placed in the electrolytic solution. It is characterized in that the surface of the wire is electrolytically descaled by applying an electric current through the liquid, and the energization direction to the wire is reversed at a predetermined cycle.

According to the method described above, the electrolytic descaling effect is enhanced by reversing the energization direction at a predetermined cycle, and the scale and the like strongly adhered to the wire can be effectively removed. In addition, since the wire is subjected to electrolytic descaling while being transported in an electrolytic solution in a loop-like state, it is possible to directly guide the wire supplied from a rolling mill or the like to a cleaning tank for continuous processing, thereby increasing the processing efficiency. Can be enhanced. In addition, since the wire rods in the looped state are laminated with their winding portions displaced from each other, there is also an advantage that the wire rods have less overlapping portions than the coils and the like and processing unevenness is less likely to occur. In the descaling process of the present invention, in addition to the scale formed on the surface of the wire, oil and dirt attached to the surface may be removed in some cases.

In order to remarkably obtain the electrolytic descaling effect by the above method, the reversal frequency of the energizing direction is set to 0.1.
˜70 times / second is preferable, and more preferably 0.2 to 30 times / second.

With respect to the electric current, the state in which the electrode side is the anode and the wire side is the cathode is the forward direction, and the state in which the polarity is the opposite direction is the reverse direction, and the forward time is the same as the reverse time or The energization direction can be reversed so that the length becomes longer than that. By doing this, for example, when the scale layer is reduced / removed using the cathodic reduction reaction,
The removal efficiency is further enhanced. In the present specification, an electrode or a wire material portion on the side that releases a positive charge into the electrolytic solution is defined as an anode, and an electrode or wire material portion on the side that receives a positive charge from the electrolytic solution is defined as a cathode.

On the other hand, the electrodes in the electrolytic solution can be arranged so as to form a pair with respect to a wire rod conveyed in a loop state, with the wire rod sandwiched above and below, and from one side of the paired electrodes. By energizing the other side through the wire, electrolytic descaling of the wire can be performed. In this case, the energization direction can be reversed at a predetermined cycle between the pair of electrodes. By doing so, the electric current is indirectly applied to the wire rod, and the electric contact portion for the wire rod is not formed, so that the spark or the like is less likely to occur. Few. For example, in the method in which the wire itself is used as an electrode to directly energize from a power supply, the side of the wire facing the counter electrode is exclusively electrolytically descaled, and if the opposite side of the wire is to be cleaned, the wire or electrode layout must be changed. It must be troublesome. On the other hand, according to the present configuration, the wire rod is preferentially electrolytically descaled on the side facing either the anode side or the cathode side, and by changing the energization direction by the upper and lower electrodes, Since the side to be preferentially cleaned can be freely set, it is not necessary to change the arrangement of the wire or the electrode.

In the above-mentioned structure, the current flows in the forward direction when the specific side of the pair of electrodes is the cathode,
It is possible to reverse the energization direction so that the state of the opposite polarity is the opposite direction and the time of the forward direction is the same as or longer than the time of the opposite direction. Specifically, this specific side can be set to a side where electrolytic descaling is preferentially performed on the wire, whereby the electrolytic descaling effect on that side can be enhanced.

Further, a plurality of pairs of electrodes, which are paired with each other with the wire rod sandwiched vertically in the electrolytic solution, are arranged in the electrolytic solution along the transport direction of the wire rod.
At least one of the pair of electrodes is composed mainly of carbon, and the polarities of the pair of electrodes are set to be the same between them and opposite to each other with the wire. Further, the polarities of the electrodes arrayed in the wire rod transport direction can be set to be different in the array direction alternately or by a predetermined number. In this case, the energization direction is reversed between the electrodes and the wire at a predetermined cycle. With this configuration, since the electrodes arranged on both sides of the wire rod are set to have the same polarity, both sides of the wire rod can be uniformly descaled.

As the electrolytic solution, one containing hydrofluoric acid and nitric acid can be used. That is, by performing electrolytic descaling treatment in an electrolytic solution containing hydrofluoric acid and nitric acid, a strong oxide layer formed on, for example, stainless steel can be quickly removed. Further, although such an electrolytic solution has a relatively strong corrosive property, in the present invention, since the electrode is mainly composed of carbon, even if such an electrolytic solution is used, the electrode deteriorates due to corrosion. Therefore, the problem that the life is shortened is unlikely to occur. It is desirable to use the above-mentioned electrolytic solution containing 0.1 to 5% by weight of hydrofluoric acid and 1 to 20% by weight of nitric acid. These two
When the content of the component is less than the lower limit value of the above range, the effect of cleaning the surface of the wire cannot be sufficiently obtained. On the contrary, if the hydrofluoric acid or nitric acid component is contained in excess of the upper limit of the above range, the cleaning effect may not be sufficiently obtained, and the content of these acid components may be extremely high. When the number of the wires increases, the surface condition of the wire may deteriorate due to the corrosion by the acid. Here, the electrolytic solution is more preferably 0.5 to 2% by weight of hydrofluoric acid and 3% of nitric acid.
It is preferable to use one containing 10 to 10% by weight.

Specifically, the above-mentioned electrolytic descaling treatment is applied to the iron-based wire rod conveyed and supplied in a loop state from the wire rod manufacturing line by rolling or drawing to form a scale layer formed on the surface thereof. It can be effectively removed. For example, when electricity is supplied with the wire side as a cathode and the electrode side as an anode, Fe-based oxides formed on the surface of the wire are reduced and dissolved to promote scale removal. Further, when electrolytic descaling treatment is performed on the iron-based wire by the method of the present invention, it is possible to obtain a surface state having relatively excellent corrosion resistance without particularly performing passivation treatment. There are advantages that can be omitted.

Next, the apparatus of the present invention for carrying out the above-described electrolytic descaling method is characterized by including the following requirements. Electrolytic descaling tank: Contains an electrolytic solution containing hydrofluoric acid and nitric acid. Wire transport means: transports a wire in a loop-like state in an electrolytic solution. Electrode: placed in an electrolytic descaling tank, and applying an electric current between the wire and the wire through an electrolytic solution to subject the surface of the wire to electrolytic descaling. Energization control means: Controls so that the energization direction between the electrode and the wire is reversed at a predetermined cycle.

According to the apparatus having the above structure, the electrolytic descaling method of the present invention can be efficiently carried out.

The electrodes can be arranged so as to form a pair with respect to a wire rod conveyed in an electrolytic solution in a loop state, with the wire rod sandwiched vertically. In this case, even if the polarities of the pair of electrodes are set to be opposite to each other,
It does not matter whether they are set to be the same. And
When setting to be the same, a plurality of such electrode pairs are arranged in the wire transport direction, and
In the arrangement direction, the polarities of the electrodes can be alternately or different from each other by a predetermined number.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings by way of some examples. FIG. 1 is a block diagram showing a configuration example of a surface cleaning line for a wire rod, particularly an iron-based wire rod such as a stainless steel wire, which is configured to include the electrolytic descaling device of the present invention. The surface cleaning line 5
0 is a wire rod W manufactured by the rolling device 1 (or wire drawing device)
, A solution treatment furnace 4, a cooling tank 5, a preliminary cleaning tank 6, an electrolytic descaling device 8,
A finishing treatment tank 10, a neutralization tank 12 and the like are provided, and shower tanks 7, 9, 11 for washing with water are appropriately arranged between the tanks.

The wire W from the rolling device 1 is wound by the looper 2. For example, as shown in FIG. 2, the looper 2 has a wire rod W inserted from the upper side, and the wire rod W is wound around the outer lower portion of the main body 2b through a plurality of turn rolls 2a provided at the outer lower portion thereof. Form L. The formed winding portions L sequentially drop on the conveyor 3 arranged below the looper 2 and are stacked in a mutually shifted state as the conveyor 3 is driven to be in a loop state. Hereinafter, the wire W is continuously subjected to a series of processes while being conveyed by the conveyor 3 and the like in the loop-like state throughout the entire surface cleaning line 50.

Returning to FIG. 1, the solution heat treatment furnace 4 is for solidifying the carbide or the like in the wire W to prevent intergranular corrosion or the like of the wire W in the following pickling step. After the treatment, the wire W is forcibly cooled in the cooling tank 5 so that carbides and the like do not reprecipitate. Next, the pre-cleaning tank 6 is provided for previously dissolving and removing soluble scales and the like from the wire W, and stores a pickling liquid such as a sulfuric acid solution. Then, the electrolytic descaling apparatus 8 of the present invention is disposed downstream thereof, and the detailed configuration will be described later.
A finishing treatment tank 10 containing a hydrochloric acid solution or the like is arranged further downstream of the electrolytic descaling device 8 to finish the surface of the wire W after electrolytic descaling. The wire W after the finishing treatment is further conveyed to the neutralization tank 12, where the treatment liquid and the like remaining by being dipped in a neutralization liquid such as a prepalene solution is neutralized and sent to the following steps. Depending on the material or properties of the wire W, one or more of the solution treatment furnace 4, the cooling tank 5, the preliminary cleaning tank 6, the finishing processing tank 10, and the shower tanks 7 and 11 may be appropriately used. It can be omitted.

FIG. 3 is a side view schematically showing an example of the electrolytic descaling device 8. The electrolytic descaling tank 20, which is formed in a horizontally long box shape and contains the electrolytic solution 21, and the wire rod W in the loop state. A carry-in side conveyor 22 that is carried into the electrolytic descaling tank 20, a processing conveyor 23 that serves as a wire carrying means that carries the wire W in the electrolytic solution 21, electrodes 24 and 25 for electrolytically descaling the wire W, and An unloading-side conveyor 26 that unloads the treated wire W from the electrolytic descaling tank 20 is provided. The electrolytic solution 21 is an aqueous solution containing hydrofluoric acid and nitric acid, for example, 0.1 to 5% by weight of hydrofluoric acid (preferably 0.5 to 2% by weight) and 1 to 20% by weight of nitric acid (desirably 3 to 10% by weight). % By weight) is used. The cover body 4 is provided above the electrolytic descaling tank 20.
0 is provided, and a window 41 is formed on the side surface thereof. Reference numeral 42 denotes a duct for discharging steam or the like generated in the electrolytic descaling tank 20.

Processing conveyor 23 and unloading side conveyor 2
6 wraps long and flexible conveying members 30 and 31 around a plurality of rotating members 27 to 29 arranged in parallel, and rotates at least a part of the rotating members 27 to 29. By driving, the conveying members 30 and 31 are moved in a circular manner, and a loop-like wire W is placed on the conveying members 30 and 31 on the upper surface side of the circulation path of the conveying members 30 and 31. A transport type is used.

Here, more specifically, the processing conveyor 23 has its rotating members 28 and 29, as shown in FIG.
Is a plurality of (for example, two) rotating shafts 28a and 29a arranged at predetermined intervals in the longitudinal direction of the electrolytic descaling tank 20.
And a plurality of sprockets 28b and 29b arranged at a predetermined interval along the axial direction of the rotating shafts 28a and 29a and capable of rotating integrally with the rotating shafts 28a and 29a. Chains as the transport members 31 are respectively wound around. As a result, the processing conveyor 23 is configured such that the transport surface is liquid-permeable.

On the other hand, as shown in FIG. 3, the carry-out side conveyor 26 has a rotating member 28 common to the processing conveyor 23,
A plurality of chains as the conveying member 30 are wound around the rotating member 27, which is different from the rotating member 27, so that the conveying surface of the wire W has an upward slope in the conveying direction. As shown in FIG. 4, the conveying member 30 includes a sprocket 27b provided on the rotating member 27 and another sprocket 28c provided on the rotating member 28 while avoiding interference with the sprocket 28b for the processing conveyor 23. Have been hung up between. When the rotating member 27 is driven by the drive motor 32, the rotating member 27 operates in conjunction with the processing conveyor 23.

On the other hand, the electrodes 24 and 25 are formed in a plate shape extending along the width direction of the electrolytic descaling tank 20, and as shown in FIG. The upper one 25 and the lower one 24 are arranged so as to be opposed to each other with the conveyance path of the processing conveyor 23 interposed therebetween, and a plurality of the pairs are provided along the conveyance direction. There is. Here, the electrodes 24 and 25 are mainly composed of carbon, and for example, those obtained by molding graphite powder into a plate shape and firing it are used, but those of other materials, for example, precious metals such as platinum and palladium. Alternatively, a plate-shaped base material coated with these noble metals can also be used.

FIGS. 6 and 7 show a specific example of a method of attaching the pair of electrodes 25 and 24 to the electrolytic descaling tank 20. That is, each of the electrodes 25 and 24 is supported by the supporting members 33 and 34 provided at both ends thereof in a suspended state at a predetermined height. Specifically, each support member 33 and 34
7 is locked to the upper edge of the electrolytic descaling tank 20 at the locking portions 33b and 34b formed on one end side as shown in FIG. 7, and the other end side is locked as shown in FIG. The electrodes 25 and 24 are hung from the inside of the electrolytic descaling tank 20, and the electrodes 25 and 24 are respectively supported from below by supporting portions 33a and 34a formed at the end portions thereof.
The portion including the parts 34a to 34a, which is immersed in the electrolytic solution 21, is covered and insulated by insulating covering bodies 33c and 34c such as resin. Here, the supporting height of each of the electrodes 25 and 24 can be adjusted by changing the hanging length of each of the supporting members 33 and 34. Further, as shown in FIG. 7, one of the support members 33 or 34 is
By arranging two of the electrodes 25 or 24 close to both side edges of the wire W in the transport direction of the wire W and disposing the other one between them, interference between the two can be avoided, and the upper and lower electrodes can be avoided. It is possible to support 25 and 24 in a state of facing each other.

Next, as shown in FIG. 5, each of the electrodes 24 and 25 is connected to a DC power supply device 35 via a polarity reversal control section 36 as an energization control means. The connection method will be described later.

The operation of the electrolytic descaling device 8 will be described below. In FIG. 3, the wire W conveyed in a loop state from the side of the preliminary cleaning tank 6 (FIG. 1) by the carry-in side conveyor 22 has the winding portion L of the electrolytic descaling tank 2
It is successively dropped onto the processing conveyor 23 in 0 and immersed in the electrolytic solution 21. The dropped wire W is the processing conveyor 2
3 is again in the loop state and is conveyed between the electrodes 24 and 25. At this time, as shown in FIG. 8, a current is passed from one side of the electrodes 24 and 25 to the other side through the wire W, so that the surface of the wire W undergoes the reaction of removing the formed scale. It will be electrolytically descaled. The transport member 31 of the processing conveyor 23 is formed of a chain as described above, and the transport path thereof is in fluid communication, so that the energization between the electrodes 24 and 25 is not disturbed.

Here, the current density of the current passed between the electrode 24 (or 25) and the wire W is 1 A / dm ^2.
Above, it is desirable to set to 5 A / dm ² or more,
The electrolytic descaling effect described above is enhanced. Even if the current density is set to be higher than 50 A / dm ² , the amount of hydrogen or oxygen generated only increases, and the descaling rate does not change so much. Therefore, the current density is in the lower range, more preferably 30 A / dm ^2. It is preferable to set it within the range of dm ² or less.

Regarding the scale removal reaction, as shown in FIG. 8, on the side of the electrode (24 in the drawing) serving as the anode, the iron ions in the scale formed on the surface of the wire W are reduced and the scale is reduced. Is presumed to be removed (that is, cathodic reduction reaction occurs on the wire surface).
On the other hand, an anodic oxidation reaction occurs on the opposite surface of the wire W. For example, chromium oxide (C
In the case of r ₂ O ₃ ), hydrolysis occurs due to the anodic oxidation reaction based on the reaction formula shown in Chemical formula 1, and this is converted to an acid-soluble chromic acid component or dichromic acid component, which is dissolved and removed. Is estimated to be promoted. That is, a strong and difficult to decompose oxide (scale) such as an iron-based material containing a large amount of Cr component such as stainless steel can be effectively removed by the mechanism described above. In this case, if the electrode potential on the cathode side is set near or lower than the hydrogen generation potential, the above anodic oxidation reaction is promoted and the above-mentioned effect can be further enhanced. Thus, the cathode reduction reaction occurs on one side of the wire W and the anodic oxidation reaction occurs on the other side, so that an electric current indirectly flows to the wire W between the electrode 24 and the electrode 25.

[0030]

Embedded image

Here, in the electrolytic descaling tank 20, the polarities of the electrodes 24 and 25 forming a pair with the wire W interposed therebetween are as follows.
If one is set to the same polarity and the other is set to the opposite polarity, the cathodic reduction reaction always occurs on one side of the wire W, and the anodic oxidation reaction always occurs on the other side. Therefore, there may be a difference or nonuniformity in the electrolytic descaling treatment state. Therefore, an electrolytic descaling device 8 having a similar configuration in which the polar relationship between the upper and lower electrodes 25 and 24 is reversed is arranged on the downstream side, and a similar descaling process is continuously performed using the electrolytic descaling device 8. Reactions occurring on both sides are also reversed on the upstream side and the downstream side, and as a result, the entire surface of the wire W can be uniformly processed. Further, for example, as shown in FIG. 9, the same electrolytic descaling tank 2 is used.
If the respective electrodes 24 and 25 in 0 are connected to the power supply device 35 so that the predetermined number of upstream electrodes and the remaining downstream electrodes have opposite polarities, the wires W and The surface can be electrolytically descaled uniformly by one electrolytic descaling tank 20. In addition, as shown in FIG. 10, a method of connecting the electrodes 24 and 25 so that the polarities of the electrodes 24 and 25 are mutually inverted between those adjacent to each other in the transport direction of the wire W, and further, as shown in FIG.
In the transport direction of the wire W, the electrodes 24 to 25 are divided into a predetermined number of sets, and in each set, the adjacent electrodes have the same polarity relationship, and the adjacent sets have the same polarity relationship. The same effect can be obtained by the method of connecting so as to be opposite.

Next, the direction of current flow between the upper and lower electrodes 25 and 24 is reversed by the polarity reversal controller 36 (FIG. 5) at a predetermined cycle, and the electrolytic descaling effect on the wire W is enhanced. In order to obtain such an effect more remarkably, the frequency of reversal of the energization direction is preferably set to 0.1 to 70 times / second, more preferably 0.2 to 30 times / second. Good. Specifically, in each pair of electrodes 25 and 24 arranged in the transport direction of the wire W, when the polar relationships are all the same, that is, as shown in FIG. In the case where the upper side is the anode and the lower side is the cathode with the wire W interposed therebetween, the lower side is the anode and the upper side is the cathode, as shown in FIG. The energizing direction can be switched between them. FIG. 13 (a)
In the case where the polarities of the electrodes 25 and 24 are arranged so as to be alternately opposite to each other as shown in FIG. The energization direction can be switched so that the positional relationship is reversed.

The following mechanism is presumed to be the reason why the electrolytic descaling effect is enhanced by reversing the energizing direction as described above. First, when the wire W side serves as a cathode and a reduction reaction of Fe oxide occurs, hydrogen gas based on protons generated by the above-mentioned hydrolysis reaction or electrolysis reaction of water causes cracks or the like formed in the scale layer. While permeating the inside of the scale, the permeated hydrogen gas is rapidly released from the scale layer when the energization direction is reversed and the wire W side becomes the anode. On the other hand, on the contrary, when the wire W side serves as an anode, oxygen is generated and penetrates into the scale layer, and this is rapidly released with polarity reversal. That is, each time the polarity is reversed, the penetration of hydrogen and oxygen into the scale layer
It is considered that the release is repeated alternately, and the impact accelerates the destruction / falling of the scale layer.

The polarity reversal control section 36 can be composed of, for example, a well-known square wave inverter circuit or the like, and can switch the direction of current flow to a square wave. in this case,
The switching pattern may be set such that the absolute value of the maximum current and the energization time are substantially equal between the forward energization and the reverse energization. For example, as shown in FIG. A specific side of 24 (for example, a side that preferentially performs electrolytic descaling with respect to the wire W) serves as an anode, and a state having a polarity opposite to this is defined as a reverse direction, which is a forward direction. Time t1 when time t0 is in the opposite direction
If the length is set longer than the above, the above-mentioned effect can be obtained more remarkably. Specifically, t0 is 1 to 5 of t1
It is preferable to set the value about twice, more preferably about 1 to 3 times.

Further, when the absolute value Imax of the maximum current during forward energization becomes smaller than the absolute value Imin of the maximum current during reverse energization, the impurity component in the electrolytic solution when the wire W side becomes the cathode becomes Since it may be deposited on the surface of the wire W and contaminate it, it is desirable to set Imax ≧ Imin. In addition, the reversal of the energizing direction is shown in FIG.
It is also possible to switch to a sine wave shape as shown in FIG. Note that the reversal control unit 36 can be omitted if a sufficient cleaning effect can be obtained without particularly reversing the energization direction.

Next, in the example shown in FIG. 16, the electrodes 25 and 2 forming a pair with the wire W conveyed in a loop state in the electrolytic solution with the wire W sandwiched above and below.
A plurality of sets 4 are arranged along the transport direction of the wire W. The polarities of the paired electrodes 25 and 24 are set to be the same as each other, and are alternately inverted in the arrangement direction along the wire W. Such a polarity setting is performed by setting the DC power supply 47 to the pair of adjacent electrodes 25 of the wire 25 and the pair of adjacent electrodes 24 of the lower wire 24, respectively. The adjacent electrodes for each set,
This can be achieved by connecting to different electrode terminals of the corresponding DC power supply 47.

The energization path in the electrolytic solution 21 is, as shown by the broken line in FIG. 16, a portion extending from the electrode on the cathode side to the wire W, a portion flowing along the wire W, and further from the wire W to the electrode. And that which consists of three parts of the part that goes to the adjacent electrode (that is, the anode side),
It is presumed that they are formed above and below the wire W. In this case, the electrodes 25 and 24 arranged on both sides of the wire W are sandwiched therebetween.
Are set to have the same polarity, the same reaction always occurs on both sides of the wire W, and the entire surface of the wire W can be uniformly descaled. The electrodes 25 and 2
In order to improve the current-carrying efficiency from the wire 4 to the wire W side (or vice versa), the electrodes arranged on the same side of the wire W are made of an insulator such as a plastic material between adjacent electrodes. A partition plate 48 can be arranged.

Here, in the above structure, the polarity reversal control unit 36 reverses the polarity of the current flow between the electrodes adjacent to each other at a predetermined cycle, and accordingly, the electrodes 25 and 24 and the wire W are electrically connected. The energizing direction of is also reversed at the same cycle,
The descaling effect is improved. In this case, the time t0 when the forward direction is the forward direction when the state where a specific side of the adjacent electrodes is the anode is the forward direction and the state where the specific side is the opposite polarity is the reverse direction.
If the time is set to be longer than the time t1 in the opposite direction, the descaling effect becomes more remarkable.

Here, in the reference technology described below, the same effect as the polarity reversal of the power supply in the present invention may be achieved. That is, between the electrodes 25 and 24 that are paired up and down with the wire W sandwiched between them, by energizing between the electrodes 25 and 24 and the wire W while transporting the wire W, the surface of the wire W is removed. Scale it. In this case, if the polarities of the adjacent electrode pairs in the carrying direction are alternately or alternately reversed every predetermined number of sheets, the energizing direction to the wire W will be reversed at a cycle corresponding to the carrying speed of the wire W. . In this case, even if the polarities of the upper and lower electrodes 25 and 24 in each electrode pair are set to be the same as shown in FIG. 17A, they are different from each other as shown in FIG. It may be set to be either. In addition, for example, a plurality of sets of first electrode pairs 45 having the same polarity setting and a second electrode pair 46 having a smaller number (for example, one set) having a polarity setting opposite to that of the second electrode pairs 45 are alternately arranged. By doing so, the energization time by the first electrode pair 45 can be made longer than the energization time by the second electrode pair 46, which is the same as the case where the time between the forward direction energization and the reverse direction energization is made different. The effect can be achieved.
Here, the electrodes 25 and 24 included in the second electrode pair 46
It is also possible to set the length of the wire W in the transport direction to be smaller than that of the electrodes 25 and 24 included in the first electrode pair 45.

The electrolytic solution 21 is not limited to a solution containing hydrofluoric acid and nitric acid, but it is also possible to use, for example, an aqueous solution of a neutral salt containing sodium sulfate or the like.

In the embodiment described above, the method of indirectly energizing between the electrodes arranged with the wire W interposed therebetween and the wire W is adopted, but the power supply device 35 uses the wire W itself as an electrode. A method of directly energizing the battery may be adopted.
A specific example thereof is shown in FIG. That is, in the electrolytic descaling device 8 shown in FIG.
However, the inner tank 51 for always filling the electrolytic solution 21
And an outer tank 52 that receives the electrolytic solution 21 that has overflowed from the inner tank 51, so that the electrolytic solution 21 in the outer tank 52 is returned to the inner tank 51 by the pump 50a via the pipe 52a and circulates. Has become. Inside the inner tank 51,
A plurality of conveying rollers 53 as a conveying means are arranged, and each is driven to rotate in the same direction by a driving unit such as a motor (not shown) so that the wire rod W in the loop state is conveyed on the upper surface side. . Each of the transport rollers 53 is made of an electrode material mainly composed of carbon and receives power from the power supply device 35.
By coming into contact with this, the wire W is directly energized by the power supply device 35 and also functions as a cathode electrode by itself. On the other hand, a plate-shaped electrode 54 is arranged below the carrying roller 53 in a non-contact state with the carrying roller 53, and the wire W is energized through a gap between the carrying rollers 53. .

In the electrolytic descaling device 8 described above, the polarity reversal control section 36 is designed to reverse the energization direction between the wire W and the electrode 54 at a predetermined cycle. In this case, the state in which the electrode 54 side is the anode and the wire W side is the cathode is the forward direction, and the state in which the polarity is opposite to this is the reverse direction, so that the time in the forward direction is longer than the time in the reverse direction. By controlling the reversal of the energization direction, the electrolytic descaling effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a wire surface cleaning line including an electrolytic descaling apparatus of the present invention.

FIG. 2 is an explanatory view showing the action of the looper.

FIG. 3 is a side sectional view showing an example of an electrolytic descaling device.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a plan view schematically showing a connection state between electrodes and a power supply device.

FIG. 6 is a front cross-sectional view showing an example of a method of attaching an electrode to an electrolytic descaling tank.

FIG. 7 is a partially enlarged plan view thereof.

FIG. 8 is an explanatory diagram showing a state in which electric current is applied between electrodes through a wire rod in a loop state.

FIG. 9 is a schematic diagram showing a polarity setting example of each electrode when a plurality of electrode pairs is used.

FIG. 10 is a schematic diagram showing a first modified example thereof.

FIG. 11 is a schematic diagram showing a second modification thereof.

FIG. 12 is a schematic diagram showing an example in which the energization direction is periodically inverted when a plurality of electrode pairs are used.

FIG. 13 is a schematic diagram showing a modified example thereof.

FIG. 14 is a graph showing an example of a reversal pattern of the energization direction.

FIG. 15 is a graph showing another example of the same.

FIG. 16 is a conceptual diagram showing an example in which the polarities of the electrodes are set to be the same in the electrode pair arranged with the wire material sandwiched therebetween.

FIG. 17 is a conceptual diagram showing another embodiment of the descaling device of the present invention.

FIG. 18 is a schematic side view showing still another embodiment of the electrolytic descaling device of the present invention.

FIG. 19 is a schematic view showing a conventional wire pickling method.

[Explanation of symbols]

 W Wire material L Winding part 3 Conveyor (wire material conveying means) 8 Electrolytic descaling device 20 Electrolytic descaling tank 21 Electrolyte 23 Processing conveyor (wire material conveying means) 24, 25 Electrode 36 Polarity reversal control section (energization control means)

Claims (11)

[Claims] 1. A winding member is sequentially formed on a wire, and the winding members are soaked in an electrolytic solution while being conveyed in a state in which the winding members are shifted in one direction and stacked on each other (hereinafter referred to as a loop state).
By passing an electric current through the electrolytic solution between the wire and the electrode arranged in the electrolytic solution, the surface of the wire is electrolytically descaled, and the energizing direction for the wire is set to a predetermined cycle. A method for electrolytically descaling a wire, which comprises reversing with a wire. 2. The current is in the forward direction when the electrode side is the anode and the wire side is the cathode, and when the polarity is the opposite direction, the time is the forward direction. The electrolytic descaling method according to claim 1, wherein the energization direction is reversed so as to be equal to or longer than the time. 3. In the electrolytic solution, the electrodes, which are paired with each other, are arranged above and below the wire rod conveyed in a loop state, and the paired electrodes are arranged from one side of the pair of electrodes to the other. By energizing to the side through the wire,
The electrolytic descaling method according to claim 1, wherein the wire rod is electrolytically descaled, and the energization direction is reversed at a predetermined cycle between the pair of electrodes. 4. The current is the current of the pair of electrodes,
The state in which the specific side is the cathode is the forward direction, and the state in which the polarity is opposite to that is the reverse direction, and the forward direction time is equal to or longer than the reverse direction time. The electrolytic descaling method according to claim 3, wherein the energization direction is reversed. 5. In the electrolytic solution, a plurality of pairs of electrodes, which are paired with each other with the wire rod being vertically sandwiched therebetween, are arranged in the electrolytic solution along the transport direction of the wire rod. At least one of the pair of electrodes is composed mainly of carbon, and the polarities of the pair of electrodes are set to be the same between them and opposite to the wire. Further, the polarities of the electrodes arranged in the transport direction of the wire are set so as to be different from each other alternately or in a predetermined number in the array direction, and the direction of conduction between the electrodes and the wire is set. The electrolytic descaling method according to claim 1, wherein the inversion is performed at a predetermined cycle. 6. The frequency of reversal of the energizing direction is 0.1 to 10.
The electrolytic descaling method according to claim 1, wherein the electrolytic descaling is set to 70 times / second. 7. The electrolytic descaling method according to claim 1, wherein the electrolytic solution contains hydrofluoric acid in an amount of 0.1 to 5% by weight and nitric acid in an amount of 1 to 20% by weight. . 8. An electrolytic descaling tank containing an electrolytic solution and a wire rod in which sequentially formed winding portions are shifted in one direction and laminated on each other (hereinafter referred to as “loopro state”) in the electrolytic solution. A wire rod carrying means for carrying and a wire rod in a loop state, which is placed in the electrolytic descaling tank and is carried in the electrolytic solution, is energized via the electrolytic solution to electrolytically remove the surface of the wire rod. An electrolytic descaling device for a wire rod, comprising: an electrode to be scaled; and an energization control means for controlling the electrode so that the energization direction between the electrode and the wire rod is reversed at a predetermined cycle. 9. The electrodes are arranged so as to form a pair with respect to the wire rod conveyed in a loop state in the electrolytic solution so as to sandwich the wire rod vertically, and one of the electrodes forming the pair. By energizing the wire from one side to the other through the wire, the surface of the wire being conveyed is subjected to electrolytic descaling, further, the energization control means, the pair of electrodes of 9. The electrolytic descaling device according to claim 8, wherein the energization direction is reversed between them. 10. In the electrolytic solution, a plurality of sets of electrodes, which are paired with each other with the wire rod sandwiched therebetween, are arranged along the transport direction of the wire rod in the electrolyte solution. At least one of the pair of electrodes is composed mainly of carbon, and the polarities of the pair of electrodes are set to be the same between them and opposite to the wire. Further, the polarities of the electrodes arranged in the transport direction of the wire are set so as to be different from each other alternately or in a predetermined number in the arrangement direction, and the energization control unit is configured to change the electrodes. 9. The electrolytic descaling device according to claim 8, wherein the energization direction between the wire and the wire is reversed at a predetermined cycle. 11. The electrolytic descaling device according to claim 8, wherein the frequency of the reversal of the energization direction by the energization control unit is set to 0.1 to 70 times / sec.