JP2006297431A - Wet type metal wire drawing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet type metal wire drawing method capable of enhancing the lubricity by reducing the emulsion diameter, and preventing ingress of foreign matters such as metal powder, plating powder and degraded oils in a wire drawing die. <P>SOLUTION: When a water-based lubricant with oil components emulsified and dispersed is fed from a lubricant tank 20 to a lubricating liquid tank 12 of a wire drawing machine 10 to draw a metal wire 13, foreign matters including metal powder and degraded oil components contained in the lubricant returned from the lubricating liquid tank 12 to the lubricant tank 20 are settled, separated and removed in the lubricant tank 20. A second tank 30 is provided between the lubricant tank 20 and the lubricating liquid tank 12. By applying the ultrasonic vibrations to the lubricant fed from the lubricant tank 20 to the lubricating liquid tank 12 in the second tank 30, the lubricant having the small emulsion diameter and less containing foreign matters can be fed to the wire drawing machine 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wet wire drawing method for a metal wire using an aqueous lubricant in which an oil component is emulsified and dispersed as a lubricant.

Conventionally, water-based lubricants in which an oil component is emulsified and dispersed are widely used for wet drawing of metal wires such as copper wires and brass-plated steel wires for steel cords. On the other hand, as a method of supplying lubricant to a wire drawing machine in wet wire drawing, a method (batch type) in which wire drawing is performed in a state where the lubricant is stored in the wire drawing machine, a tank for storing the lubricant, and wire drawing There is a method (circulation type) in which wire drawing is performed while circulating a lubricant between the machine and a lubricating liquid tank in which a wire drawing die is disposed.
By the way, the lubricity of the water-based lubricant in the drawing of the metal wire is such that the smaller the emulsion diameter, the better the pullability of the lubricant into the wire drawing die. It is advantageous to make it smaller.
As a method for reducing the diameter of the emulsion, for example, a method of passing a dispersed phase through a path chemically treated, a method using a high-pressure disperser or an ultrasonic disperser are known (for example, patents). Reference 1).
On the other hand, as an example of using ultrasonic waves for wet wire drawing of a metal wire, a lubricant holding chamber and a high pressure chamber are provided between a plurality of dies, and a mixed liquid of water and a lubricant having increased pressure is supplied to the high pressure chamber. In the wire drawing method in which the wire rod is introduced into a subsequent die while increasing the pressure in the lubricant holding chamber by pressure feeding, the entire die is subjected to wire drawing by applying ultrasonic vibration, and the die tapered portion and A method has been proposed in which a lubricant is introduced between the metal wire and the lubricity to improve the lubricity (for example, see Patent Document 2).
JP-A-10-310646 Japanese Patent Laid-Open No. 7-80537

  By the way, although the lubricity becomes advantageous if the emulsion diameter is reduced, simply adding ultrasonic vibration to the lubricant will cause metal powder and plating powder accumulated in the lubricant when the wire drawing process is continued. Further, foreign matters such as deteriorated oil are suspended and dispersed in the lubricant, and a part of the foreign matter is drawn into the drawing die, resulting in a problem that the lubricity is deteriorated and the surface of the wire is roughened.

  The present invention has been made in view of the above-mentioned conventional problems. The emulsion diameter is reduced to improve lubricity, and foreign matter such as metal powder, plating powder, and deteriorated oil is prevented from entering the wire drawing die. An object of the present invention is to provide a wet wire drawing method for a metal wire that can be performed.

As a result of intensive studies, the present inventor removed foreign matters such as metal powder, plating powder, and deteriorated oil accumulated in the lubricant returned from the lubricating liquid tank to the lubricant tank, and then the foreign matters were removed. By adding ultrasonic vibration to the lubricant and supplying it to the lubricating liquid tank, the emulsion diameter can be reduced and the amount of the foreign matter suspended and dispersed in the lubricant in the lubricating liquid tank can be reduced. The present inventors have found that it can be significantly reduced and have arrived at the present invention.
That is, the invention according to claim 1 of the present application draws a metal wire while circulating an aqueous lubricant in which an oil component is emulsified and dispersed between a lubricant tank and a lubricating liquid tank of a wire drawing machine. A wet drawing method for wire processing, the step of removing foreign matter including metal powder and deteriorated oil components contained in the lubricant returned from the lubricant tank to the lubricant tank, and from the lubricant tank And a step of applying ultrasonic vibration to the lubricant supplied to the lubricating liquid tank or the lubricating liquid in the lubricating liquid tank.
The invention according to claim 2 is the wet wire drawing method of the metal wire according to claim 1, wherein the average emulsion diameter of the lubricant returned from the lubricant tank to the lubricant tank is less than 3 μm. It is characterized by adding ultrasonic vibration.
According to a third aspect of the present invention, in the wet drawing method for a metal wire according to the first or second aspect, the lubricant returned from the lubricating liquid tank to the lubricant tank is retained in the lubricant tank. The foreign matter containing the metal powder and the deteriorated oil component contained in the lubricant is settled and separated, and then supplied to the lubricating liquid tank.

  The invention according to claim 4 is a wet drawing method in which a water-based lubricant in which an oil component is emulsified and dispersed is supplied from a lubricant tank into a lubricating liquid tank of a wire drawing machine to draw a metal wire. As a lubricant to be supplied from the lubricant tank to the lubricating liquid tank, a lubricant from which foreign substances including metal powder and deteriorated oil components contained in the lubricant are removed in the lubricant tank is used. The ultrasonic vibration is added to the lubricant, and then the lubricant is supplied to the lubricating liquid tank.

According to the present invention, when the metal lubricant is drawn by supplying the aqueous lubricant in which the oil component is emulsified and dispersed from the lubricant tank into the lubricating liquid tank of the wire drawing machine, The foreign matter including the metal powder and the deteriorated oil component contained in the lubricant returned to the lubricant tank is removed by centrifugation or sedimentation, and the lubrication supplied from the lubricant tank to the lubricant tank Since the ultrasonic vibration is added to the lubricant in the agent or the lubricant solution tank, the emulsion diameter of the lubricant can be reduced to improve the lubricity. In addition, since there is only new foreign matter generated by drawing in the lubricating liquid tank, it is possible to greatly reduce the intrusion of foreign matter into the drawing die.
At this time, if the ultrasonic vibration is added so that the average emulsion diameter of the lubricant returned from the lubricating liquid tank to the lubricant tank is less than 3 μm, the lubricity can be further improved. Further, separation of the foreign matter in the lubricant tank can be further facilitated.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a wet wire drawing method for a metal wire according to the best mode. In FIG. 1, reference numeral 10 denotes a lubricating liquid tank 12 in which a plurality of wire drawing dies 11 are arranged, and a metal wire 13 to be drawn. A wire drawing machine having a plurality of drive capstans 14 and 15 for guiding the oil, and a lubricant tank 20 for supplying a water-based lubricant in which an oil component is emulsified and dispersed in the lubricating liquid tank 12. , 30 is a second tank provided between the lubricant tank 20 and the lubricating liquid tank 12, and in this example, an ultrasonic vibrator 31 is disposed in the second tank 30, and the lubricant tank Ultrasonic vibration is added to the lubricant supplied from 20 to the lubricating liquid tank 12, and the lubricant to which this ultrasonic vibration is added is supplied to the wire drawing machine 10.
Further, in this example, the lubricant tank 20 is allowed to stay in the recovery tank 21 for recovering the lubricant returned from the lubricant liquid tank 12 and the lubricant for a predetermined time (for example, about 30 to 50 minutes). And a supply tank 23 for supplying the lubricant from which the foreign substances have been removed to the lubricating liquid tank 12, and returned from the lubricating liquid tank 12 to the lubricant tank 20. The foreign matter including the metal powder and the deteriorated oil component contained in the lubricant is removed by sedimentation separation or the like, and the lubricant from which the foreign matter has been removed is sent to the second tank 30. Thereby, since the emulsion diameter of the lubricant supplied to the lubricating liquid tank 12 can be reduced, the lubricity of the drawing die 11 can be greatly improved and the lubricating liquid tank 12 is supplied. Since the lubricant does not contain foreign matter, entry of foreign matter into the drawing die 11 can be greatly reduced.

By the way, as for the degree of finer emulsion of the lubricant, it is necessary that a lubricant having a small emulsion diameter is supplied to all the drawing dies 11 in the lubricating liquid tank 12. The degree of emulsion refinement is preferably evaluated not by the lubricant supplied to the lubricating lubricating liquid tank 12 but by the average emulsion diameter of the lubricant returned from the lubricating liquid tank 12 to the lubricant tank 20. In this example, the output and frequency of the ultrasonic transducer 31 are adjusted so that the average emulsion diameter of the lubricant returned to the lubricant tank 20 is less than 3 μm. Thereby, a lubricant having a small emulsion diameter can be supplied to all the drawing dies 11. Further, since the lubricant having a small emulsion diameter does not easily settle, the sedimentation separation in the foreign matter separation tank 22 can be performed efficiently.
That is, in the foreign matter separation tank 22, the lubricant returned to the lubricant tank 20 is allowed to stay without stirring, so that metal powder having a large particle size or specific gravity or deteriorated oil content is 30-50. It settles in the bottom part of the said foreign material separation tank 22 in about minutes. Therefore, since the foreign matter has been removed from the lubricant transferred from the upper part of the foreign matter separation tank 22 to the supply tank 23, the lubricant in the second tank 30 is more than the lubricant in order to reduce the emulsion diameter. Even if sonic vibration is applied, the foreign matter is not suspended and dispersed in the lubricant. Accordingly, the wire drawing machine 10 is supplied with a lubricant having a small emulsion diameter and almost no foreign matter, so that the lubricity is improved and not only the surface roughness is small, but also the surface processing distortion is excellent. A metal wire can be obtained.
Further, as described above, if the second tank 30 is provided, the second tank 30 can be used even when there are a plurality of wire drawing machines, so that the metal wire is drawn efficiently. be able to.

  Thus, according to this best mode, the water-based lubricant in which the oil component is emulsified and dispersed is supplied from the lubricant tank 20 to the lubricating liquid tank 12 of the wire drawing machine 10 to draw the metal wire 13. When processing the lubricant tank 20, the recovery tank 21 that recovers the lubricant returned from the lubricant tank 12, the foreign substance separation tank 22 that retains the lubricant for a predetermined time to remove foreign substances, and the above A metal tank and a deteriorated oil contained in the lubricant returned from the lubricating liquid tank 12 to the lubricant tank 20 are configured by a supply tank 23 that supplies the lubricant from which foreign substances have been removed to the lubricating liquid tank 12. Foreign substances including components are separated and removed, and a second tank 30 is provided between the lubricant tank 20 and the lubricating liquid tank 12, and an ultrasonic transducer 31 is disposed in the second tank 30. From the lubricant tank 20 By adding ultrasonic vibration to the lubricant supplied to the liquid tank 12, it is possible to supply the wire drawing machine 10 with a lubricant having a small emulsion diameter and almost no foreign matter. It can be greatly improved. Therefore, it is possible to produce an excellent metal wire with less surface roughness and less surface distortion.

In the best mode described above, the ultrasonic transducer 31 is disposed in the second tank 30, but the second tank 30 is omitted as shown in FIG. An ultrasonic transducer 31 may be disposed. In this case as well, the lubricant supplied to the lubricating liquid tank 12 has already had foreign matters removed in the lubricant tank 20. Therefore, since there is only a newly generated foreign substance in the lubricant, even if an ultrasonic wave is added to the lubricant in the lubricant bath 12 to reduce the emulsion diameter, the lubricity is not impaired.
Further, it is not always necessary to supply the lubricant whose emulsion is refined by the addition of ultrasonic waves to all the drawing dies 11 of the wire drawing machine 10, but it is sufficient to supply the lubricant to at least a subsequent die having a high surface pressure between the die and the wire. Therefore, the ultrasonic transducer 31 may be further miniaturized so that ultrasonic waves are applied only to the lubricant in the vicinity of the subsequent die.
In the above example, the case where the lubricant is circulated has been described. However, even when the wire drawing process is performed in a batch manner, when the lubricant is supplied from the lubricant tank to the lubricant tank, the lubricant is lubricated in the lubricant tank. If the foreign matter including the metal powder and the deteriorated oil component contained in the agent is removed and ultrasonic vibration is added to the lubricant from which the foreign matter has been removed, and then supplied to the lubricating liquid tank, the circulation An effect almost equivalent to that of the formula can be obtained.
In addition, the metal wire to which the present invention is applied may be a metal wire drawn using an aqueous lubricant in which an oil component is generally emulsified and dispersed, such as a copper wire or a brass-plated steel wire for steel cords. That's fine. Particularly effective is the drawing of brass-plated steel wires for steel cords, which have high strength, high surface pressure with the drawing dies, and are liable to generate foreign matters such as plating fallen powder.

A brass-plated steel wire with a diameter of 1.72 mm is drawn with a slip-type wet wire drawing machine using an aqueous lubricant in which an oil component is emulsified and dispersed, and a steel with a final wire diameter of 0.30 mm in diameter is drawn. A brass-plated steel wire for cords was manufactured, and the average emulsion diameter, die life, the amount of foreign matters in the lubricant and the average emulsion diameter in the wire drawing machine 10 days after the start of wire drawing were measured. The results are shown in the table of FIG.
In Example 1, the lubricant is retained in a lubricant tank that supplies lubricant to the wire drawing machine, foreign matter is removed by sedimentation, and ultrasonic vibration is added to the lubricant in the wire drawing machine. did. The capacity of the lubricant tank was 600 liters, the amount of lubricant circulated was 20 liters / minute, and the residence time in the lubricant tank was 30 minutes.
In Example 2, a lubricant obtained by retaining the lubricant in a lubricant tank and removing foreign matters by sedimentation separation was used as a lubricant, and the wire drawing treatment was performed without circulating the lubricant.
Conventional Example 1 was drawn under the same conditions as in Example 1 except that no ultrasonic vibration was added.
Moreover, the average emulsion diameter of the lubricant at the start of wire drawing was 5 μm or less, and a common lubricant was used.
As is apparent from the table of FIG. 3, in Example 1 in which foreign matter in the lubricant was removed and ultrasonic vibration was added to the lubricant, the amount of foreign matter in the lubricant in the wire drawing machine 10 days after the start of wire drawing was The average emulsion diameter was as small as 2 μm immediately after the start, and the value hardly changed even 10 days after the start of wire drawing. In addition, since the die life was extended 1.2 times that of the conventional example, it was confirmed that the lubricity was greatly improved in the wire drawing method of the present invention.
Further, in Example 2 in which the wire was drawn without circulating the lubricating liquid, the amount of foreign matter in the lubricant in the wire drawing machine 10 days after the start of wire drawing was 60% of that in the conventional example. The value as small as 3 μm was maintained until 10 days after the start of the line. In addition, since the die life is 1.1 times longer than that of the conventional example, it has been found that the lubricity is greatly improved not only in the circulation type but also in the batch type.

  According to the present invention, it is possible to improve the lubricity by reducing the emulsion diameter and to prevent the intrusion of foreign matters such as metal powder, plating powder, and deteriorated oil into the drawing die. In addition, an excellent metal wire without ductility deterioration can be obtained, and the die life can be improved.

It is a figure which shows the wet wire-drawing method of the metal wire which concerns on the best form of this invention. It is a figure which shows the other example of the wet drawing method of the metal wire by this invention. It is the table | surface which compared the die life in the wire drawing method of this invention, and the conventional method.

Explanation of symbols

10 wire drawing machine, 11 wire drawing die, 12 lubricating liquid tank, 13 metal wire,
20 lubricant tank, 21 collection tank, 22 foreign matter separation tank, 23 supply tank,
30 Second tank, 31 ultrasonic transducer.

Claims (4)

  In a wet wire drawing method in which a metal wire is drawn while circulating an aqueous lubricant in which an oil component is emulsified and dispersed between the lubricant tank and the lubricating liquid tank of the wire drawing machine, The step of adding ultrasonic vibration to the lubricant supplied to the lubricant tank or the lubricant in the lubricant tank, and the metal contained in the lubricant returned to the lubricant tank from the lubricant tank And a step of removing foreign substances including powder and deteriorated oil components.   2. The metal wire wet according to claim 1, wherein the ultrasonic vibration is applied so that an average emulsion diameter of the lubricant returned from the lubricant tank to the lubricant tank is less than 3 [mu] m. Drawing method.   The lubricant returned from the lubricant tank to the lubricant tank is retained in the lubricant tank, and foreign matters including metal powder and deteriorated oil components contained in the lubricant are settled and separated, and then the lubricant tank The wet wire drawing method for a metal wire according to claim 1 or 2, wherein the wire wire is supplied to the wire. In the wet wire drawing method in which a water-based lubricant in which an oil component is emulsified and dispersed is supplied from a lubricant tank into a lubricating liquid tank of a wire drawing machine to draw a metal wire material, As a lubricant to be supplied to the tank, a lubricant from which foreign matters including metal powder and deteriorated oil components contained in the lubricant are removed in the lubricant tank is used, and ultrasonic vibration is added to the lubricant. A wet wire drawing method for a metal wire, wherein the lubricant is supplied to the lubricating liquid tank.

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