JPS62287019A - Method and apparatus for applying oscillation to traveling metallic sheet without contact - Google Patents

Abstract

PURPOSE:To improve the efficiency of a treatment for working a metallic sheet and to improve product quality by disposing respectively a pair of both side type polyphase induction linear motors at two points along the longitudinal direction of the traveling metallic sheet and periodically thrusts are opposite from each other. CONSTITUTION:Respectively a pair of the both side type three-phase induction linear motors L1, L2 and L3, L4 are disposed on both sides of a place P where oscillation is applied to a metallic strip S and at two points along the traveling direction of the metallic strip S. Power source devices PA, PB, PC of respectively single phase AC are connected to the linear motors L1-L4 and the windings are connected in the directions opposite from each other so that the thrusts of L2 and L4 are directed to the opposite direction B when the thrusts of L1 and L2 are generated toward a direction A from P. The linear motors are periodically excited in such a manner that the directions of the thrusts to be applied to the metallic strip S are opposite from each other at two points in the above-mentioned manner, by which the oscillation is applied to the metallic strip S without contact.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a method for processing a metal plate such as a running steel slip when performing processing such as rolling or continuous annealing. The present invention relates to a method and apparatus for applying vibration.

[Conventional technology]

It is known that applying high frequency vibrations to a metal plate, such as a steel strip, when subjected to processing such as rolling or continuous annealing has various effects.

For example, "Ultrasonic Engineering" pp. 358-363, 1975
．． 6 (published by Industrial Research Association) discloses that when ultrasonic vibrations are applied to a steel strip being rolled, deformation resistance and friction coefficient are reduced and rolling efficiency is improved. The above publication also discloses that applying ultrasonic waves to a cold-rolled steel sheet during the over-aging treatment of continuous annealing also improves the workability of the thin copper sheet.

In this way, in the process of processing and treating metal plates such as steel stock slabs, each time the ultrasonic wave is applied to the metal plate, the quality of the product and the work efficiency are improved.

[Problem that the invention seeks to solve]

However, in actual processes, for both machining and processing purposes, no means has been implemented to continuously apply vibration to a wide and moving metal plate in a non-contact state.

The present invention makes it possible to apply vibration in a non-contact state by employing an excitation means, and aims to improve product quality and work efficiency by applying vibration in actual processes. shall be.

[Means for solving problems]

The method of applying vibration to a running metal plate in a non-contact manner according to the present invention is as follows:
In order to achieve this purpose, a pair of double-sided multiphase induction linear motors each using the running metal plate as a secondary circuit are arranged at two locations along the longitudinal direction of the running metal plate, and the multiphase induction linear motor By periodically exciting the thrust force applied to the running metal plate so that the directions are opposite to each other at the two locations, the running metal plate at the middle part of the multiphase induction linear motor installation position is energized in the longitudinal direction. It is characterized by applying a vibration force that follows.

Further, an apparatus for carrying out this method includes a pair of double-sided polyphase induction linear motors arranged at two locations along the longitudinal direction of the running metal plate so that the running metal plate serves as a secondary circuit; The present invention is characterized by comprising a power supply device that excites the polyphase induction linear motor so that the directions of thrust application to the traveling metal plate at the two locations are opposite to each other.

[Effect]

FIG. 1 is a diagram illustrating the principle of applying vibration to a running metal plate in a non-contact manner in the present invention.

In the following description, the number of phases of the polyphase induction linear motor is assumed to be three, but it goes without saying that a larger number of phases may be used.

In the present invention, a pair of double-sided three-phase induction linear motors I, 1 to I are installed at two locations along the running direction of the metal strip S on both sides of a location P where vibration is to be applied to the metal strip S. Place -4. The three-phase induction linear motors L+, I-□ and L3゜■7. is 1 for each
Form a pair of glue near motors.

Single-phase AC power supplies P^, PR, and PC are connected to these three-phase induction linear motors L1 to L, respectively. The power supply device PA, pH, PC is the control device C.
and generates a three-phase AC output as described below. The outputs of the power supply devices PA, pH, and PC are supplied to three-phase induction linear motors L1 to L4;
When a thrust of L3 is generated from P toward direction A, L3
The windings are connected in opposite directions so that the thrust of L4 and P is directed from P to the opposite direction B. - FIG. 2 is a perspective view showing the arrangement of a linear motor section composed of the three-phase induction linear motors 1 to L, and FIG. 3 is a sectional view showing a pair of the linear motors.

In the layout diagram of the three-phase winding shown in FIG. 3, the ■ mark indicates the C-phase winding, the Δ mark indicates the b-phase winding, and the ○ mark indicates the C-phase winding.

Moreover, the direction is expressed by the symbol of shi. The core portions of the three-phase induction linear motors L + and L z are made of a high magnetic permeability material for high frequencies. Note that the three-phase induction linear motor L3. Since La corresponds to the shape of FIG. 3 folded back from left to right, illustration is omitted.

Figure 4 fa) shows the control signal waveform of the control device C in Figure 1, and Figure 4 (bl) shows the polarity of the tensile and compressive additional stress applied to the metal strip S at the vibration application location P in Figure 1. show.

The solid cotton line in FIG. 4 Ta1 shows the waveform of the output a of the power supply device PA, the large solid line shows the waveform of the output of the power supply device PB, and the broken line shows the waveform of the output C of the power supply device pc. Here, normal three-phase outputs are R, S, and T, respectively, and the phase relationship is such that the R phase is the reference, the S phase is delayed by 120 degrees, and the T phase is delayed by 240 degrees.

As shown in FIG. 4 Ta1, time 1. ．． 1. ．． 1. ,
At t4, the b and C signals are switched in phase. For example, before time t1, S-phase and T-phase signals are supplied to b and C, respectively, and during the period from time t1 to time t2, positive-phase and S-phase signals are supplied to b and C, respectively. Ru. Of course, periods 'F1 and T3 are in positive phase, and period T
t and T a are phase rotations of opposite phases. Next, at this time, the direction of the thrust of the linear motor is reversed.

Figure 4(b) shows the change in sign of the 1IIl force. If the In force during T1 period is positive and the thrust force during Tgl'JI is negative, then
T1+T2 = 2T (when T+ = Tz)
The direction of the thrust reverses with a period of . The frequency of the three-phase AC power supply is fo, and the number of cycles from the phase switching point to the next switching point, that is, the number of cycles corresponding to 1゛, is (2n + 1)/2 (n - 1,
2..., k), the positive and negative repetition frequency of thrust is f. /(2n+1). By arbitrarily selecting n using the control device, the repetition frequency of the thrust can be selectively changed in steps. In other words, in the vibration adding mechanism according to the present invention, the vibration frequency is set to n
The selection can be changed freely within the range of ≧3.

In the above explanation, the thrust is repeated between positive and negative when giving vibration to the metal plate. However, if the effect is sufficiently imparted, or for other purposes, ζ positive thrust, release ( It is clear that repeating (zero) or negative thrust, opening (zero) is also possible and is within the scope of the invention.

〔Example〕

The principle of vibration generation according to the present invention has been described above, and next, an example in which the present invention is applied to cold rolling and continuous annealing will be described.

FIG. 5 shows an embodiment in which the present invention is applied to cold rolled steel strip.

Excitation device I according to the present invention is installed before and after the four-high cold rolling mill consisting of work roll-R and backup roll BUR,
Ml and LM2 were provided, and mechanical vibration was applied to the steel strip S in the longitudinal direction from the front and rear of the processed portion. As a result, the effect of reducing the friction between the steel strip S and the work roll l, the effect of reducing the deformation resistance, and the effect of heating the steel strip S by the eddy current are combined,
Compared to the case where this equipment is not applied, 80% more high-pressure and high-speed rolling is possible. It was confirmed by ordinary steel rolling implementation and analysis examples that the contribution rate of the above effects is approximately 20% due to the former two and 60% due to heating. Also, the effect ratio of the front and rear excitation devices LM 1 and LM 2 is 11M1 is 90
%. Although the effect is halved, it is one of the excitation devices! ,
It is possible to implement only A1 and is proposed as a variant.

FIG. 6 shows an embodiment in which the apparatus according to the invention is applied to continuous annealing of steel strip. FIG. 6 shows the first pass of a continuous annealing line for manufacturing steel plates for searching, a section in which the material is subjected to overaging treatment after being heated, soaked and rapidly cooled.

As a modified application example according to the invention, a linear motor LMI to L is applied to the steel strip S between the lower hearth roll ff11.
M6 was installed, and a Zavotrol SPR was installed between these to prevent the steel strip S from lateral shaking. 1. Gates 1 to 14 Gate 2, LM3 to 14M4, and 1. Gate 5-1
When the tensile force is between 716 and 17M2 to 1. Gates 3 and 1, M4-1. ? The area between 15 and 15 was compressive force, and when the front three places were compressive force, the latter two places were made to be tensile force. As a result, in this embodiment, vibrations are applied at five locations between passes. This is because as the vibration frequency increases, the attenuation becomes significant, so this configuration was adopted to lengthen the total vibration application time.

Also, by setting the number of linear motors to an even number of 6, consideration was given so that the total thrust would be zero. Due to the vibration addition of the steel strip during overaging in this example, the Lankford value (γ value), which is one of the characteristic values of the steel strip S with the steel plate for searching, is lower than when no vibration is applied. It was 20% positive.

The vibration frequency in the application example shown in FIGS. 5 and 6 was set to 15.4 to 22.2 KIIz. Also, the fundamental frequency f of the three-phase power supply. was 200 Kllz, and n of the phase switching cycle (2n+1)/2 was 4 to 6.

Note that the following points should be kept in mind when applying the present invention.

That is, since the excitation device is of a linear motor type, an eddy current flows through the target metal plate, and the metal plate is heated by the phase. Therefore, 1: is applied when there is no problem in applying vibration or stress to the metal plate while it is running, or when heating can be actively utilized.

Also, if you increase the distance between the linear motor and the metal plate,
The conversion efficiency of electric power to vibration decreases. Therefore, it is necessary to install a linear motor close to the metal plate. Therefore, it is applied when the linear motor is running with the metal plate under tension so that it does not come into contact with the metal plate.

〔Effect of the invention〕

As described above, in the present invention, since vibration is applied to the running metal plate by non-contact excitation, it is possible to prevent the occurrence of scratches on the metal plate or the device that applies vibration. In addition, by controlling the power supply of the linear motor,
The intensity and frequency of the applied vibration can be easily adjusted. Furthermore, since it is based on the excitation means, even a wide metal plate can be given uniform vibration in the width direction. This is effective in improving the quality performance and work efficiency of steel strip.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of the device according to the present invention, and FIG.
FIG. 3 is a perspective view of the linear motor section shown in FIG. 1, and FIG. 3 is a sectional view of the linear motor section shown in FIG. 1, showing a winding diagram of the linear motor. Fourth
FIG. 181 shows signal waveforms of outputs a, b, and c of the power supply device of FIG. 1. Figure 4 (bl corresponds to the waveform in the same figure (al),
FIG. 3 is a diagram showing the direction of thrust generated in a metal plate. FIG. 5 is a schematic diagram of an embodiment in which the apparatus of the present invention is applied to cold rolling equipment, and FIG. 6 is a schematic diagram of an embodiment in which the apparatus of the invention is applied to continuous annealing equipment. Patent applicant: Nippon Steel Corporation Agent
Masu Kobori (and 2 others) o 4-coheta +1 Toco HR: Hearth σ-le SPR; Support role

Claims (1)

[Scope of Claims] 1. A pair of double-sided multiphase induction linear motors each using the running metal plate as a secondary circuit are disposed at two locations along the longitudinal direction of the running metal plate, and the multiphase induction linear motor By periodically exciting the thrust force applied to the running metal plate so that the directions are opposite to each other at the two locations, the running metal plate at the middle part of the multiphase induction linear motor installation position is energized in the longitudinal direction. A method for applying vibration to a running metal plate without contact, the method comprising applying a vibration force along the moving metal plate. 2. A pair of double-sided polyphase induction linear motors arranged at two locations along the longitudinal direction of the running metal plate so that the running metal plate serves as a secondary circuit; A device for applying vibration to a running metal plate in a non-contact manner, comprising: a power supply device that excites the multiphase induction linear motor so that the directions of thrust application are opposite to each other.