JPS5920753B2 - Vibration treatment method for wire coils - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for effectively removing black scale, red rust, etc. by pickling a wire rod that has been wound and tied into a coil shape as a bundle of wire rods.

In addition to pickling wire rod coils, the present invention can be similarly applied to bath liquid treatments such as water washing, degreasing, neutralization, lubricant attachment, and chemical conversion film formation. When pickling wire coils in a bundled state, the wire bundle is suspended from a hook extending from a beam having a vibrating device supported by a shock absorber and immersed in an acid bath. It is known that the wire bundle is pickled while being vibrated.

This vibratory pickling method uses the overall vibration of the wire bundle to give a stirring effect to the bath liquid, renew the bath liquid film in contact with the wire, and mechanically remove scale and iron salts floating from the metal surface of the wire. This is intended to promote the pickling effect by accelerating the pickling process and causing the peeled substances to settle at the bottom of the bath solution. However, even with this method, it is difficult for the pickling bath solution to penetrate into the contact area between the hook and the wire coil and the area where the wire rods are tightly bound with binding wires and come into close contact with each other, making it difficult to remove the detached materials, resulting in uneven descaling. If the unevenness of smut removal is still occurring (
・This problem remains, and this results in various problems in terms of quality and work efficiency.In contrast, the present invention solves this problem in addition to the overall vibration of the wire bundle. Focusing on the effectiveness of resonance with the circular bending natural frequency of each strand of the coil, we determined the excitation frequency of an excitation device that transmits vertical vibration to the wire coil via a hanging means such as a hook. By periodically changing the circular bending natural frequency of each strand of the wire coil or its resonance frequency to exist within the range of change, the process of changing the excitation frequency can be controlled. During this period, the natural frequency of each strand of the coil's annular bending matches the excitation frequency, and resonance is induced and vibrates violently against the neighboring strands that are in contact with each other. By allowing the pickling bath solution to penetrate into the inside of the coil wires that overlap (and contact each other), the pickling effect can be improved at the mutual contact points of the wire wires and the contact points between the wire rod and the hanging hook. By making the entire wire coil vibrate with a large amplitude,
The pickling effect is thoroughly carried out over the entire surface of the wire bundle both macroscopically and microscopically, thereby eliminating descaling and desmutting defects that conventionally tend to occur in confined areas between strands of wire coils. It is characterized by the fact that sufficiency can be easily resolved.

In the present invention, it is sufficient to apply excitation vibration in the vertical direction of the suspended wire coil, and the excitation direction may be tilted or moved in order to perturb the wire coil from the suspended part. There is no need to deviate from the center of gravity of the suspended mass system.

The basic effect of the present invention is that the excitation frequency of the vibrating device causes each strand of the suspended wire coil to resonate in response to the circular bending natural frequency of each strand of the wound wire coil. However, the circular bending natural frequency of each strand of a wire coil has a slight difference for each strand even in the same coil, but if the wire diameter of the target wire coil is 5.5 to 15.0wn/wire bundle Since the circular bending natural frequency of each wire is within the range of 7 to 17H2 when the diameter is 900 to 1200 wm, it is possible to change the excitation frequency of the vibration device to this range, and in the process of this change, the wire rod The resonance is caused to occur when it corresponds to the circular bending natural frequency of each strand of the coil. As long as this condition is satisfied, the excitation frequency of the excitation device may be changed continuously with a fixed period or an irregular period, or may be changed intermittently, and the waveform of the changing process may be a triangular waveform, Any waveform such as a sine waveform, a rectangular waveform, or any other waveform may be traced.
・Explain in detail.

FIG. 1 shows a schematic configuration of an apparatus for carrying out the method of the present invention,
The wire coil 1 is tied down with a binding wire 2 and suspended from a C-shaped hook 5 that extends downward from the beam 4 on the pickling bath 3 in a cantilevered manner in the longitudinal direction. immersed in.

The beam 4 is supported on a vibration receiving table 8 by a shock absorber 7, in this example a spring. The vibrating device 9 on the beam 4 can be any well-known vibrating device, but in this example, an eccentric crank type vibrating device or an eccentric weight rotation type vibrating device is used.
It is preferable to arrange the rotation axis parallel to and horizontally with the wire coil surface to give the wire coil 1 the most effective vertical vibration. Vibratory devices of this type are within the known scope. In the present invention, as shown in FIG. 2, a current with a varying frequency is supplied to the vibration device 9 from an AC power source 10 via a frequency converter 11, and the excitation frequency is changed to the above-described frequency. 7
-17H2 range. As a means for changing the excitation frequency from the vibration excitation device 9, in addition to the above-mentioned vibration device drive source, a DC series motor with a wide speed change range, an electromagnetic variable speed motor, and a multi-pole motor can be used. A number conversion synchronous motor or the like can be used.

The mode of temporal change in the excitation frequency is illustrated by the diagram in Figure 3 with time on the horizontal axis and frequency on the vertical axis.
You can choose from a wide range.

Fig. 3A shows a fixed cycle time t with the effective excitation frequency 7 to 17H2 corresponding to the circular bending natural frequency of the wire across all the wire coils of the wire diameter and bundle diameter as described above, as a frequency change range.
It is shown as a triangular waveform, but it can also be a sine waveform.The opening in Figure 3 shows that the excitation frequency is changed over a period of t seconds during continuous excitation at a frequency of 17H2. 7H2, and the rectangular waveform is close to L'-o Fig. 3 A. When changing the excitation frequency of the mouth,
Even if the circular bending natural frequency of each strand of the target wire coil to be processed is not accurately known, the excitation frequency and natural vibration are calculated twice during one period during the process of changing the excitation frequency. There will be a point in time when the numbers match. Figure 3 C uses a relatively inexpensive synchronous motor, and repeatedly lowers the excitation frequency to about 7H2 by changing the number of poles while exciting at 30H2 with 4 poles. In the case of a wire rod coil having a diameter of a small wire, resonance can be caused by the method of the present invention during vibratory pickling at a normally high excitation frequency, resulting in good pickling properties. Moreover, as shown in FIG. 2, if a plurality of vibration devices 9a, 9b, and 9c with the same conversion frequency and different frequencies within the range of 7 to 17 Hz are prepared,
If the natural frequency depending on the wire diameter and bundle diameter of the wire coil is within the range of this excitation frequency, effective resonance vibration can be achieved by switching and using the excitation device with one frequency converter 11 for any wire coil. It is possible to cause As mentioned above,
According to the present invention, when excitation is performed at an excitation frequency in a range that includes the natural frequency of the wire coil, and resonance is caused during pickling, each strand of wire is Because of the intense resonance vibration, the contact area between the hook and the coil and the binding wire are strongly tightened.The area where the hook and coil come in contact with each other and the binding wire can be pickled reliably in a short time without any uneven pickling.According to the present invention, the structure In addition to the effects already described in connection with the operation, the following effects are achieved.

(1) Descaling and de-smutting can also be applied to areas where conventional pickling is difficult to effect, such as the contact area of the wire coil with the hook, the area that is strongly tightened by the binding wire, and the inside where strands of wire overlap. There will be no unevenness. Therefore, it is possible to improve the quality and reduce the pickling time at the same time. (2) Furthermore, since the above-mentioned parts can be completely washed and neutralized in the same manner, deterioration of the liquid in the next process can be prevented and rusting can be prevented.

(3) Furthermore, unevenness in the treatment of coating agents such as phosphoric acid film, lime film, and boring film is eliminated, improving quality and at the same time improving wire drawing efficiency in the next step.

(4) Furthermore, the present invention can be easily carried out by attaching a vertical vibration device and a frequency conversion device to the hook of a conventional wire rod coil pickling device, and the existing device can be replaced with a vertical vibration pickling device. If so, the present invention can be implemented easily and inexpensively by simply adding a frequency converter.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing a schematic configuration of a device implementing the present invention, Fig. 2 is a connection diagram between the frequency converter and the excitation device, and Fig. 3 A, C, and C show the excitation of the excitation device. FIG. 3 is a diagram showing a temporal change process of vibration frequency. 1. ．． ．． ．． ．． ．． Wire coil, 2... Binding wire, 3
... Pickling bathtub, 4 ... Beam material, 5 ...
...C-shaped hook, 6... Pickling bath liquid, 7...
...Buffer device, 8...Body receiver, 9, 9a,
9b, 9c...Gashin device, 10...AC power supply, 11...Frequency conversion device, T, t/...
...Excitation frequency change cycle time.

Claims (1)

[Claims] 1. A method in which a wire rod coil is suspended by a suspension means and immersed in a processing bath liquid, and the wire rod coil is processed while being vibrated in the vertical direction, and the vertical vibration is transmitted to the wire rod coil via the suspension means. The excitation device is composed of an excitation device in which the frequency of vertical vibration changes periodically and intermittently, and the range of change in the excitation frequency is equal to the circular bending natural frequency (7 to 17) of each strand of the suspension wire coil. 1. A method for processing vibrations of a wire coil, characterized in that the vibrations pass through a range of 100 to 100 Hz (Hertz) and are not substantially separated from it.