JP3526283B2 - Wire rod electrolytic treatment method and wire rod electrolytic treatment 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 wire rod electrolytic treatment method and a wire rod electrolytic treatment apparatus for subjecting a wire rod to electrolytic surface treatment such as electrolytic cleaning or electrolytic polishing.

[0002]

2. Description of the Related Art As a technique for performing electrolytic surface treatment such as electrolytic cleaning or electrolytic polishing, the invention described in Japanese Patent Publication No. 5-43795 and Japanese Patent Application Laid-Open No. 2-47291 using a pipe-type cell for electrolytic pickling equipment. There is. As a technique similar to these, a PR electrolysis method is known in which the bipole phenomenon is utilized and the electrolytic polarity is reversed on the way.

In the PR electrolysis method, for example, as shown in FIG. 6, a pair of pipe-shaped electrodes 10 are connected in series via an insulating joint portion 20, and an anode / cathode of a power source 40 is connected to each electrode. An electrolytic treatment device is used. In the pipe electrode,
The electrolytic treatment liquid is supplied from the tank 60 via the pump 61, and the wire rod 100 travels in the axial direction to perform the electrolytic treatment of the wire rod 100.

[0004]

However, the above-mentioned prior art has the following problems.

(1) The leakage current in the polarity conversion portion is large, and the ratio of the input current to the electrolytic treatment is small. At the joint portion that serves as the polarity conversion portion, the electrolytic treatment liquid in the cathode pipe and the electrolytic treatment liquid in the anode pipe are not separated, so that current flows through the electrolytic treatment liquid (leakage current). Therefore, the ratio of the applied current spent in the electrolytic treatment is small, the current loss is large, and the waste is large.

(2) It is difficult to pass a soft wire, a wire having poor straightness or a wire having a small diameter through a pipe. To improve the processing capacity, it is desirable that the pipe electrode is thinner and longer, but it is necessary to pass a soft wire, a wire with poor straightness (strong line habit), or a wire with a small diameter through it. Is difficult, and a jig such as an introduction rod must be used.

(3) The polarity ratio and the number of polarity conversion cannot be easily changed. In the conventional equipment, since the number of electrodes and the electrode length are designed in advance, it is impossible to change the number of polarity conversions or the electrode length ratio depending on the situation.

(4) It is difficult to control the traveling position of the wire rod. In order to perform the electrolytic treatment uniformly over the entire circumference of the wire, it is necessary to have the wire at the center of the pipe-shaped electrode. The amount of processing on the side close to the electrode is large, and the amount of processing on the opposite side is small, resulting in non-uniform processing in the circumferential direction. Further, if the deviation is large, the electrode and the wire may come into contact with each other. The longer the pipe length, the higher the risk of uneven treatment and contact with the electrode.

Therefore, a main object of the present invention is to provide a wire rod electrolytic treatment method capable of eliminating a leak current which does not contribute to the electrolytic treatment of the wire rod.

Another object of the present invention is to provide a wire rod electrolytic treatment apparatus capable of eliminating a leak current which does not contribute to the electrolytic treatment of the wire rod.

[0011]

The present invention suppresses the flow of an electrolytically treated liquid in each pipe-shaped electrode tube by using an insulating shield plate between the pipe-shaped electrodes arranged in series, and The leak current that does not contribute to the processing is reduced to achieve the above object.

That is, the electrolytic treatment method of the present invention is based on the PR electrolytic method in which pipe-shaped electrodes having different polarities are arranged in series, an electrolytic treatment liquid is supplied into the electrodes, and the wire is run to electrolytically treat the surface of the wire. The wire rod electrolytic treatment method is characterized in that a shielding plate made of an insulator that restricts the flow of the electrolytic treatment liquid is provided between the electrodes to prevent a leak current between the electrodes.

In the wire rod electrolytic treatment apparatus of the present invention, a plurality of pipe-shaped electrodes having an electrolytic treatment liquid chamber inside, a supply mechanism for supplying the electrolytic treatment liquid into the electrolytic treatment liquid chamber, and a wire rod running in the electrode. A traveling mechanism, a joint part made of an insulator mounted between both ends of the pipe-shaped electrode and each electrode, and an insulator shield provided in the joint part to restrict the flow of the electrolytic treatment liquid between the adjacent electrodes. It is characterized by including a board.

By providing the shielding plate, it is possible to prevent the current from being short-circuited through the processing liquid and causing a large loss as a leakage current. The shield plate is formed of an insulator so as to suppress conduction of leak current. In addition, the joint portion is also insulative to insulate the electrodes of the polarity conversion portion from each other to prevent a short circuit.

The pipe-shaped electrodes preferably have slits extending from their outer circumference to their inner circumference. Thereby, a wire can be inserted from the outside of the pipe-shaped electrode and placed inside the electrode. For the same purpose, it is also preferable that the pipe-shaped electrode and the joint portion have a divided structure.

The length of each pipe-shaped electrode is preferably 500 mm or less. When the length of the electrode is 500 mm or more, it becomes difficult to obtain the line runout prevention effect due to the central hole of the shielding plate,
The possibility of non-uniform processing and contact with the electrodes increases. Also, 50
For long pipes of 0 mm or more, the order of polarity, the number of polarity conversions,
It is difficult to obtain the effect of switching the effective electrode length and the electrode length of each polar section. And the pipe length L and the pipe inner diameter d are L / d
A value of <20 is preferable. When L / d becomes 20 or more,
This is because the degree of processing nonuniformity due to slight line blurring increases.

A wire rod running on the central portion of the shield plate made of an insulator is used.
The insertion hole is formed, and the area of the insertion hole A (mm ^Two) And the wire diameter d (mm)
(A / π)^1/2It is preferable that −d / 2 ≦ 5. `` (A / π)^1/2
−d / 2 ”indicates the average distance between the inner surface of the insertion hole and the wire surface.
If this exceeds 5 mm, the wire rod will be locked in the center of the electrode.
The bundle force is weak, which causes uneven processing due to line runout.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. (Overall Configuration of Apparatus) FIG. 1 shows the electrolytic pickling apparatus of the present invention. The device of the present invention has a plurality of pipe-shaped electrodes 10 connected in series via a joint portion 20. Each electrode 10 has
A power supply 40 that supplies electric power is connected. Further, it is provided with a supply mechanism for supplying the electrolytic treatment liquid into the electrode and a traveling mechanism for traveling the wire rod in the electrode. Electrolysis is performed by running the wire while supplying electric power to the electrodes and supplying electrolytic treatment liquid into the electrodes. Hereinafter, the configuration of this device will be described in detail.

(Pipe-shaped electrode) The pipe-shaped electrode 10 is shown in FIG.
As shown in, a hollow cylindrical pipe made of a conductive material such as metal or graphite. Since the electrolytic pickling is performed by the PR electrolysis method using the bipole phenomenon, the pipe-shaped electrode is
It is necessary to use two or more side by side.

In this example, the electrode 10 was provided with a slit 11 extending in the longitudinal direction and communicating from the outer circumference to the inner circumference. By providing this slit 11, the wire rod can be fitted from the outer periphery rather than the end portion of the electrode. The slit 11 does not necessarily have to be provided at the top of the electrode, but it is preferable that the slit 11 is linear throughout.

In addition, since the processing liquid flows out from the slit 11 during processing, it is preferable to provide a sealing mechanism as shown in FIG. 3 if necessary. FIG. 3A shows a configuration in which a narrow slit 11 is provided and a linear sealing member 12 is fitted into the slit 11. Figure 3 (B) shows wide slit 1
1 is provided so that the upper part of the electrode is opened, and a sealing member 13 that fits the slit 11 is fitted therein.

In addition, as shown in FIG.
May have a divided structure. Even in the case of the divided structure, the wires can be easily arranged in the electrodes by dividing the electrodes when the wires are set, and the electrodes can be combined in a pipe shape during processing. Here, an electrode that can be formed into a pipe shape by joining a pair of gutter-shaped divided pieces 14 is shown. Each divided piece
The materials of 14 must be the same, and it is necessary to make sufficient contact so that the joints will conduct electricity.

When the slit 11 is not sealed, it is preferable that the width of the slit is suppressed to be slightly wider than the wire diameter.
By narrowing the slit width, electrolytic treatment can be performed uniformly over the entire circumference.

Further, each of the pipe-shaped electrodes 10 has a structure shown in FIG.
As shown in, a power supply wiring attachment portion 15 is provided. The power supply wiring attachment portion 15 is a terminal for connecting a power supply line from the power source 40 to the electrode 10, and various forms can be used. For example, a female screw shape, a bolt shape, a projection shape with a through hole, etc. may be mentioned. In FIG. 1, the anode and cathode of the power source 40 are alternately connected to the adjacent pipe electrodes 10.

With the structure in which a large number of pipe-shaped electrodes 10 are connected as described above, and by providing the power supply wiring attaching portion 15 on each electrode, the polarity order and the number of polarity conversion can be changed by increasing or decreasing the number of electrodes or switching the wiring from the power source. , The effective electrode length and the electrode length of each polar section can be easily changed. Therefore, it is possible to easily change the optimum conditions according to the characteristics of the wire to be processed.

(Joint part) In addition to supporting the pipe-shaped electrode 10, the joint part 20 is for introducing and discharging the processing liquid, shielding the leak current of the polarity converting part, and holding the wire to be processed at the center position. Have a role.

Details of the joint portion are shown in FIG. The joint portion 20 has a configuration in which a substantially semi-cylindrical upper portion 21 and a lower portion 25 are joined together to form a cylindrical shape. This joint part 20
Is formed of an insulating material and insulates the electrodes of the polarity converting portion to prevent a short circuit.

The upper part 21 comprises a semi-cylindrical surface 22, a pair of semi-circular plates 23 arranged in the middle of the semi-cylindrical surface 22, and inner peripheral projections 24 formed on both sides of the semi-circular plate 23. The semicircular plate 23 sandwiches a shielding plate 29 described later, and forms a wire insertion hole between the groove provided in the shielding plate 29 and the semicircular plate 23. The inner circumferential protrusion serves as a stopper for the end of the pipe-shaped electrode.

On the other hand, the lower portion 25 has a semi-cylindrical surface 26, a supply hole 27 and a discharge hole 28 penetrating the semi-cylindrical surface 26, and a disc-shaped shield plate 29 formed in an intermediate portion inside the semi-cylindrical surface 26. The inner peripheral projections 30 are formed at both ends of the shield plate. Supply hole
The electrolytic treatment liquid is introduced and discharged from the 27 and the discharge hole 28. The shield plate 29 partitions adjacent pipe-shaped electrodes that are connected to each other through a joint portion, and restricts the flow of the processing liquid between these electrodes. A radial groove 31 extending from the outer edge to almost the center is formed on the shielding plate 29.

When setting the wire rod, the upper portion 21 is set to the lower portion 25.
Then, the wire is fitted into the groove 31 of the shield plate. Then, the upper portion 21 is covered with the lower portion 25 to form a substantially cylindrical shape. At that time, the shielding plate 29 is sandwiched between the semi-circular plates 23 of the upper part 21, and the space surrounded by the semi-circular plate 23 and the groove end portion of the shielding plate 29 becomes an insertion hole for running the wire rod. In the case of this example, the insertion hole is formed so as to be surrounded by the arc of the groove end and the straight chord of the semicircular plate 23. The insertion hole does not have to be circular, but is preferably circular, regular polygonal, or a symmetrical shape corresponding thereto in order to make the distance between the electrode 10 and the wire uniform.

Needless to say, the area of the insertion hole is larger than the sectional area of the wire. By reducing the area of the insertion hole, it is possible to suppress the positional deviation due to the vibration of the wire, the slack of the wire, and the radial runout of the pipe-shaped electrode due to the liquid flow. In particular,
Since each of the pipe-shaped electrodes 10 is short, the wire is supported by each of the joint portions 20, and the occurrence of wire slack can be effectively suppressed. As a result, the wire can be always positioned in the center of the pipe-shaped electrode 10, and non-uniform processing does not occur in the circumferential direction of the wire. Further, it is possible to prevent contact between the electrode and the wire rod while reducing the distance between the electrode and the wire rod, and to reduce loss of electrolytic current.

As described above, the joint portion 20 does not need to be divided into upper and lower parts in the plane including the center line, and may be a partially open type, a hinge type, a rotary sealing type, etc. as shown in FIG. Is also good.

FIG. 5A shows a joint portion in which the upper portion and the lower portion in FIG. 4 are integrated and only the upper half disc portion 32 can be removed. When setting the wire rod, the semicircular plate portion 32 is removed and the wire rod is fitted into the groove of the shield plate 29.

FIG. 5B shows a joint portion in which a semicircular lid portion 34 is provided on the lower portion of FIG. 4 via a hinge 33. When setting the wire, the lid 34 is opened and the wire is fitted into the groove of the shield plate 29.

FIGS. 5C and 5D show a structure in which two fixed shield plates 29A and rotation shield plates 29B are provided in a cylindrical portion 35 having a slit extending in the axial direction. A groove 29A1 aligned with the slit of the cylindrical portion 35 is formed in the fixed shield plate 29A fixed in the cylindrical portion 35. On the other hand, the rotation shield plate 29
A groove 29B1 extending from the outer edge to the center is also formed in B.
When inserting the wire, first, the groove 29B1 of the rotary shield plate 29B is aligned with the groove 29A1 of the fixed shield plate. Next, the wire rod is inserted from the outer periphery of the cylindrical portion 35, and the wire rod is dropped to the ends of the grooves 29A1 and 29B1 of each shield plate. Then, the rotation shield plate 29B is rotated to form a wire rod insertion hole, and the wire rod is positioned at the center of the cylindrical portion 35.

The joint portion 20 having the shielding plate 29 in this way
By using, the treatment liquid is made to flow for each pipe-shaped electrode and sludge accumulation in the electrode is prevented. Furthermore, the treatment liquid and the wire can be efficiently brought into contact with each other, and liquid deterioration can be prevented.

(End Presser) End pressers 50 are attached to both ends of the pipe-shaped electrodes 10 connected in series. As this end presser 50, the same one as the joint part can be used. That is, the pipe-shaped electrode 10 may be inserted only into one end of the joint portion 20 and the pipe-shaped electrode may not be arranged in the other end. Either the supply hole or the discharge hole for the processing liquid may be provided.

(Supply Mechanism) The electrolytic treatment liquid supply mechanism includes a tank 60 for storing the treatment liquid and a pump 61 for circulating the treatment liquid.
And a pipe 63 for supplying the processing liquid to the joint section 20. Various electrolytic solutions can be used as the processing solution depending on the processing target and purpose. For example, hydrochloric acid can be used in the pickling process. The flow direction of the treatment liquid is more preferably opposite to the traveling direction of the wire because the contact efficiency between the treatment liquid and the wire is increased.

(Running Mechanism) The running mechanism may be any one as long as it can move the wire rod in the electrode at a predetermined speed. For example, a wire reel may be drawn from a supply reel, the wire rod may be passed through an electrode, and a take-up reel that winds the wire rod after passing may be included.

(Test Example) A comparison was made between the comparative example and the example of the present invention under the following conditions for the electrode constitution and the input power required to remove 10 μm of the surface by electrolytic treatment. Target wire: Copper-zinc alloy wire, wire diameter 0.86mm

<Comparative example> Pipe-shaped electrode: made of graphite, inner diameter φ60 mm, outer diameter φ90 mm, length
1800mm, 2 connected pieces Polarity arrangement: (+) → (-) Wire rod / electrode distance: 30mm Joint part: Made of vinyl chloride, no shielding plate

<Example of the present invention> Pipe-shaped electrode: made of graphite, inner diameter φ30 mm, outer diameter φ60 mm, length
190mm, upper slit width 5mm, number of connected 8 pieces Polar arrangement: (+) → (−) → (+) → (−) → (+) → (−) → (+)
→ (-) Wire rod / electrode distance: 15mm Joint: made of vinyl chloride, electrode spacing 60mm, shield plate thickness 5mm, wire rod insertion hole diameter φ3mm

[0043]

[Table 1]

As described above, in the example of the present invention, the distance between the electrode and the wire can be reduced, the leak current between the electrode plates of the polarity conversion part is extremely small, and the contact between the treatment liquid and the wire is excellent, so that the apparatus length is short. Even at high linear velocity, the same effect could be obtained with low input power.

Further, in the comparative example, the treatment amount was non-uniform over the circumferential direction, and the treatment current was momentarily reduced due to the contact between the wire and the electrode, and the treatment was sometimes uneven. On the other hand, in the example of the present invention, the non-uniform processing amount did not occur in the circumferential direction, and the phenomenon that the wire and the electrode contact each other did not occur.

Further, in the comparative example, the treatment capacity was lowered after continuous treatment for about 100 hours due to sludge accumulation and liquid deterioration, and cleaning of the pipe and replacement of the electrolytic treatment liquid were required. On the other hand, in the example of the present invention, no decrease in processing capacity was observed even after continuous treatment for 150 hours.

[0047]

As described above, according to the processing method and the processing apparatus of the present invention, the following effects can be obtained.

Since the treatment liquids in contact with the electrodes having different polarities can be separated by the shield plate in the joint, the leakage current flowing through the treatment liquids can be made extremely small, and efficient electrolytic treatment with small energy loss can be performed.

By reducing the leak current between the processing liquids,
Generation of gas due to decomposition of the processing liquid is suppressed, and overheating of the processing liquid is small so that liquid deterioration can be suppressed.

By providing the slit at the upper end of the pipe with a width slightly wider than the diameter of the wire and dividing the joint into upper and lower parts, the wire can be set in the running portion only by dropping it from the upper part. As a result, it is not necessary to insert a wire from the end of the pipe-shaped electrode as in the conventional case, and even a thin wire, a soft wire, or a wire with a bad line habit can be easily set.

[Brief description of drawings]

FIG. 1 is a schematic view of an electrolytic treatment apparatus of the present invention.

FIG. 2A is an end view of a pipe-shaped electrode used in the device of the present invention, and FIG. 2B is a front view.

3A is an end view of a pipe-shaped electrode with a narrow slit, FIG. 3B is an end view of a pipe-shaped electrode with a wide slit, and FIG. 3C is an end view of a pipe-shaped electrode divided into upper and lower parts. Is.

4A is an end view of the upper part of the joint, FIG. 4B is a longitudinal sectional view of the same, FIG. 4C is an end view of the lower part of the joint, and FIG.

FIG. 5 (A) is an end view of a partially open joint part,
(B) is an end view of the hinge joint part, (C) is an end view of the rotary seal joint part, and (D) is a vertical cross-sectional view of the rotary seal joint part.

FIG. 6 is a schematic view of a conventional electrolytic treatment apparatus.

[Explanation of symbols]

10 Pipe electrode 11 slits 12 Sealing member 13 Sealing member 14 pieces 15 Power supply wiring mounting part 20 Joint section 21 top 22 Semi-cylindrical surface 23 half disk 24 Inner circumference protrusion 25 bottom 26 Semi-cylindrical surface 27 Supply hole 28 Discharge hole 29 Shield 29A fixed shield 29B Rotation shield 29A1 groove 29B1 groove 30 Inner peripheral protrusion 31 groove 32 Half disk part 33 hinges 34 Lid 35 Cylindrical part 36 slits 40 power 60 tanks 61 pump 63 plumbing 100 wire rod

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) C25F 7/00

Claims (5)

(57) [Claims] 1. A method for electrolytically treating a wire rod by a PR electrolysis method, in which pipe-shaped electrodes having different polarities are arranged in series, an electrolytic treatment liquid is supplied into the electrodes, and a wire rod is run to electrolytically treat the surface of the wire rod. A shield plate made of an insulator that restricts the flow of the electrolytic treatment liquid is installed between the electrodes, and an insertion hole for running the wire rod is provided at the center of the shield plate to insert the shield plate.
Holes in area A of (mm ²⁾ and Senzai径 d (mm) (A / π ) 1/2 - and d / 2 ≦ 5
A method of electrolytically treating a wire is characterized by preventing leakage current between electrodes. 2. A plurality of pipe-shaped electrodes having an electrolytic treatment liquid chamber inside, a supply mechanism for supplying an electrolytic treatment liquid into the electrolytic treatment liquid chamber, a traveling mechanism for causing a wire rod to travel in the electrode, and each pipe-shaped electrode. A joint part made of an insulator for connecting the parts and a shield plate made of an insulator provided in the joint part for restricting the flow of the electrolytic treatment liquid between the adjacent electrodes are provided.
At the center of the shielding plate, there is an insertion hole for running the wire rod, and the area A (mm ² ) of the insertion hole and the wire diameter d (mm) are (A / π ) ^1/2 − d.
A wire rod electrolytic treatment device characterized by satisfying / 2 ≤ 5 . 3. The wire rod electrolytic treatment apparatus according to claim 2, wherein the pipe-shaped electrode has a slit connected from the outer circumference to the inner circumference. 4. The wire rod electrolytic treatment apparatus according to claim 2, wherein the pipe-shaped electrode or the joint portion is separable so that the wire rod can be inserted therein. 5. The wire rod according to claim 2, wherein the length of each pipe-shaped electrode is 500 mm or less, and the pipe length L and the pipe inner diameter d are L / d <20. Electrolytic treatment equipment.