JPWO2012164746A1 - Directional electrical steel sheet manufacturing apparatus and directionality electrical steel sheet manufacturing method - Google Patents

Abstract

A directional electrical steel sheet manufacturing apparatus (10) for manufacturing a directional electrical steel sheet whose magnetic domain is controlled by irradiating a laser beam, wherein a plurality of laser beam irradiating apparatuses are arranged in the conveying direction of the steel sheet (31). (20) and a transport direction moving mechanism (15) for moving these laser beam irradiation devices (20) in the transport direction of the steel plate (31).

Description

  The present invention relates to an apparatus and a method for manufacturing a grain-oriented electrical steel sheet for producing a grain-oriented electrical steel sheet that is magnetically controlled by irradiating a laser beam.

The grain-oriented electrical steel sheet is used as a material constituting an iron core of electrical equipment such as a transformer and a rotating machine. Such a grain-oriented electrical steel sheet is required to reduce energy loss (iron loss) when magnetized. Iron loss is classified into eddy current loss and hysteresis loss. Eddy current loss is further classified into classical eddy current loss and abnormal eddy current loss.

Here, in order to give the magnetic anisotropy in the rolling direction of the grain-oriented electrical steel sheet and improve the soft magnetic characteristics, the grain-oriented electrical steel sheet in which an insulating film or the like is formed on the plate surface in order to impart stress to the ground iron Is provided. As a grain-oriented electrical steel sheet on which an insulating film or the like is formed, a steel sheet in which a glass film is formed on the surface of the steel sheet and an insulating film is further formed on the glass film is disclosed. It is well known that reducing the thickness of the electromagnetic steel sheet is effective for reducing eddy current loss.

  Also, in order to suppress eddy current loss, especially abnormal eddy current loss, as shown in Patent Documents 1 and 2, for example, a laser beam is condensed and irradiated from above the insulating film, and scanned in the substantially width direction of the electromagnetic steel sheet. By forming a laser irradiation line extending in the width direction on the surface of the steel sheet, providing a region having residual strain periodically in the rolling direction in the vicinity of the ground surface of the magnetic steel sheet, and subdividing the magnetic domain A control method is disclosed.

  When performing the above-mentioned laser magnetic domain control, a laser beam is repeatedly scanned in the width direction of the steel plate to be transported using a laser beam irradiation device disposed in a line for transporting the steel plate in the electromagnetic steel plate manufacturing process. It is necessary to control the distance PL in the rolling direction of the laser irradiation line on the steel plate surface to be constant. Here, since there is a limit to the scanning speed of the laser beam by the laser beam irradiation apparatus, when conveying the steel plate at a high speed, the interval PL in the rolling direction of the laser irradiation line should be accurately controlled at a desired interval. There was something that could not be done.

  In addition, when performing laser magnetic domain control, if laser irradiation conditions such as laser beam intensity, laser beam scanning speed, laser irradiation line rolling direction interval PL (pitch), and laser spot diameter vary, distortion applied to the steel sheet This also changes the state of the magnetic field, greatly affecting the magnetic domain refinement effect. For this reason, the conveyance speed VL of the steel plate at the time of laser beam irradiation is made constant, and laser irradiation is performed by optimizing the laser irradiation conditions.

By the way, in the continuous processing line which is a manufacturing process of a grain-oriented electrical steel sheet, a preceding coil and a succeeding coil are connected by welding at the time of coil switching of a steel sheet. At this time, the conveying speed of the steel plate at the laser irradiation position is kept constant using the looper equipment.
Here, in order to improve the manufacturing efficiency of the grain-oriented electrical steel sheet, there has been a problem that the looper equipment is enlarged when the conveying speed of the steel sheet at the laser irradiation position is increased.

Moreover, when the conveyance speed of the steel plate at the laser irradiation position is changed, there is a possibility that the appropriate laser irradiation conditions are changed and the magnetic domain control cannot be performed with high accuracy.
Here, Patent Document 3 discloses a technique of changing laser irradiation conditions according to the conveyance speed. However, even when the laser irradiation conditions are changed, it is sometimes difficult to stabilize the magnetic domain subdivision effect between a steady condition where the conveyance speed is constant and an unsteady state where the conveyance speed changes.

  Under such circumstances, the present invention can stably control the magnetic domain by the laser beam without changing the laser irradiation condition even when the conveying speed of the steel sheet at the laser irradiation position is changed. It is providing the manufacturing method of a grain-oriented electrical steel sheet, and the manufacturing method of a grain-oriented electrical steel sheet.

Japanese Patent Publication No. 06-019112 Special table 2003-500541 gazette JP 2005-336529 A

The grain-oriented electrical steel sheet manufacturing apparatus of the present invention is a grain-oriented electrical steel sheet manufacturing apparatus that manufactures magnetic domain-controlled grain-oriented electrical steel sheets by irradiating a laser beam, and is provided in a plurality in the conveying direction of the steel sheets. And a conveyance direction moving mechanism for moving these laser beam irradiation apparatuses in the conveyance direction of the steel sheet.

  In this case, laser beam irradiation can be performed at a plurality of locations in the conveyance direction of the steel sheet at a time by a plurality of laser beam irradiation apparatuses arranged in the conveyance direction. Moreover, the conveyance direction space | interval of laser beam irradiation apparatuses can be adjusted with a conveyance direction moving mechanism. Therefore, it is possible to form laser irradiation lines at a predetermined pitch even when the conveying speed of the steel plate is changed.

  Here, a control unit may be provided that adjusts the moving speed of each laser beam irradiation apparatus according to the conveying speed of the steel sheet and maintains the relative speed between the steel sheet and the laser beam irradiation apparatus constant.

  In this case, even if the conveyance speed of the steel sheet is changed, the relative speed between the steel sheet and the laser beam irradiation apparatus is kept constant by adjusting the moving speed of the laser beam irradiation apparatus according to the actual conveyance speed. It becomes possible. Then, by performing laser irradiation in a state where the relative speed between the steel plate and the laser beam irradiation apparatus is kept constant, it is possible to form a laser irradiation line without changing the laser irradiation conditions optimal for magnetic domain control. it can.

Further, when the conveying speed of the steel sheet when forming the laser irradiation line by using one laser beam irradiation apparatus is set to the reference conveying speed VL ₀ , the control unit uses n laser beam irradiation apparatuses. In this case, the moving direction and moving speed of the laser beam irradiation apparatus are set so that the relative speed VA between the conveying speed VL of the steel plate and the moving speed VS in the conveying direction of the laser beam irradiation apparatus is VA = n × VL _0. Laser beam irradiation may be performed by controlling VS.

In this case, the control unit sets the number of laser beam irradiation devices used and the moving speed VS of the laser beam irradiation devices in accordance with the steel plate conveyance speed VL. Thus, the relative velocity VA of the steel plate and the laser beam irradiation apparatus, the product of the number n and the reference transport speed VL ₀ of the laser beam irradiation apparatus used. Therefore, in the laser beam irradiation device, it can be irradiated with the laser beam at the optimal laser irradiation conditions to the magnetic domain control at reference transportation speed VL _0.

The grain-oriented electrical steel sheet manufacturing method of the present invention is a grain-oriented electrical steel sheet manufacturing method for manufacturing a grain-oriented magnetic steel sheet controlled by irradiating a laser beam. Each having a laser beam irradiation device that is movable in the conveyance direction of the steel plate, and using the single laser beam irradiation device to form the laser irradiation line, the conveyance rate of the steel plate is the reference conveyance speed VL _0. When n laser beam irradiation apparatuses are used, the relative speed VA between the conveyance speed VL of the steel sheet and the movement speed VS in the conveyance direction of the laser beam irradiation apparatus is VA = n × VL _0. As described above, the laser beam irradiation is performed by controlling the moving direction and moving speed VS of the laser beam irradiation apparatus.

In this case, the relative velocity VA of the steel plate and the laser beam irradiation apparatus, the product of the number n and the reference transport speed VL ₀ of the laser beam irradiation apparatus used. Therefore, in the laser beam irradiation device, it can be irradiated with the laser beam at the optimal laser irradiation conditions to the magnetic domain control at reference transportation speed VL _0.

  According to the present invention, even when the conveying speed of the steel plate at the laser irradiation position is changed, the laser beam can be stably irradiated.

It is an upper surface explanatory drawing of the manufacturing apparatus of the grain-oriented electrical steel sheet which is embodiment of this invention. It is side explanatory drawing of the manufacturing apparatus of the grain-oriented electrical steel plate which is embodiment of this invention. It is a schematic explanatory drawing of a laser beam irradiation apparatus. It is a flowchart in the case of decelerating the conveyance speed of a steel plate. It is a graph which shows the change of the conveyance speed in the case of decelerating the conveyance speed of a steel plate, the moving speed of an apparatus, and a relative speed. It is a flowchart in the case of accelerating the conveyance speed of a steel plate. It is a graph which shows the change of the conveyance speed in the case of accelerating the conveyance speed of a steel plate, the moving speed of an apparatus, and a relative speed. It is upper surface explanatory drawing of the manufacturing apparatus of the grain-oriented electrical steel plate which is other embodiment of this invention.

The manufacturing apparatus of the grain-oriented electrical steel sheet which is this embodiment is demonstrated using FIGS. 1-3.
The grain-oriented electrical steel sheet manufacturing apparatus 10 irradiates a laser beam to a steel sheet 31 transported in the rolling direction and performs magnetic domain control of the steel sheet 31.

The grain-oriented electrical steel sheet manufacturing apparatus 10 according to the present embodiment includes, as shown in FIGS. 1 and 2, a support roll 11 that supports a transported steel sheet 31, a laser apparatus 12 that oscillates a laser beam, and a steel sheet 31. Control the operation of the laser beam irradiation device 20 arranged in a plurality of (n) in the transfer direction, the linear motion device 15 for moving the laser beam irradiation device 20 in the transfer direction of the steel plate 31, and the laser beam irradiation device 20. And a control unit 18.
Here, in this embodiment, as shown in FIGS. 1 and 2, four laser beam irradiation devices 20a, 20b, 20c, and 20d are arranged in the transport direction.

The laser device 12 oscillates a laser beam that can be transmitted through a fiber. As a laser beam that can be transmitted through a fiber, a YAG laser (wavelength 1.06 μm), a fiber laser (wavelength 1.07 to 1.08 μm), or the like can be applied.
The laser beam oscillated by the laser device 12 is transmitted to each laser beam irradiation device 20 through the transmission fiber 13.

As shown in FIG. 3, the laser beam irradiation apparatus 20 includes a collimator 21, a polyhedral rotating polygon mirror 22, and an fθ lens 23.
The collimator 21 adjusts the diameter of the laser beam LB output from the transmission fiber 13. The rotating polygon mirror 22 deflects the laser beam LB to scan the steel plate 31 in the width direction of the steel plate 31 at high speed. The fθ lens 23 condenses the laser beam LB scanned by the rotating polygon mirror 22.
As a method of scanning the beam, there is a method using a galvanometer mirror. As a function of the collimator, a function of changing the beam diameter and a function of forming the beam into an ellipse may be provided.

Here, the scanning speed of the laser beam LB on the steel plate 31 can be adjusted by adjusting the rotational speed of the rotating polygon mirror 22.
The laser beam irradiation apparatus 20 is a distance meter (not shown) that measures the distance between a focusing mechanism (not shown) disposed between the rotating polygon mirror 22 and the fθ lens 23 and a steel plate 31 and the fθ lens 23. ) And. The distance between the fθ lens 23 and the steel plate 31 can be adjusted by this focus mechanism.

  The linear motion device 15 includes a guide rail 16 that extends in the conveying direction of the steel plate 31, and drive means (not shown) that moves the laser beam irradiation device 20 along the guide rail 16. Examples of the driving means include a combination of a ball screw and a rotary motor, a linear motor, and the like.

With this linear motion device 15, each laser beam irradiation device 20 can be moved to an arbitrary position in the conveying direction of the steel plate 31.
Further, in the linear motion device 15, the moving speed VS in the transport direction of each laser beam irradiation device 20 can be adjusted.

Here, when a plurality of (n) laser beam irradiation devices 20 are used, the irradiation position of the laser beam irradiation device 20 positioned most rearward in the transport direction among the laser beam irradiation devices 20 to be used, and Also, the distance D (m) from the irradiation position of the m-th laser beam irradiation device 20 positioned in the front in the transport direction is adjusted to satisfy the following relationship.
D (m) = n × h (m) × PL + q × PL (1)
However, m is an integer satisfying 2 ≦ m ≦ n. h (x) is 0 or any positive integer. However, h (x1) <h (x2) when x1 <x2. q is an integer that satisfies 1 ≦ q ≦ n−1 and does not take the same value for different m.

For example, as shown in FIG. 1, when four laser beam irradiation apparatuses 20a, 20b, 20c, and 20d are used and the pitch PL of the laser irradiation lines 32 is set to 4 mm, the distance D (m) is as follows. Is set.
The distance D (2) between the laser beam irradiation device 20a located at the rearmost in the transport direction and the second laser beam irradiation device 20b is D = 2 (m = 2, h (2) = 1, q = 2. 2) = 4 × 1 × 4 + 2 × 4 = 24.
The distance D (3) between the laser beam irradiation apparatus 20a and the third laser beam irradiation apparatus 20c is D (3) = 4 × 2 ×, where m = 3, h (3) = 2, and q = 1. 4 + 1 × 4 = 36.
The distance D (4) between the laser beam irradiation device 20a and the fourth laser beam irradiation device 20d is assumed that m = 4, h (4) = 3, q = 3, and D (4) = 4 × 3 ×. 4 + 3 × 4 = 60.

In each of the laser beam irradiation devices 20a, 20b, 20c, and 20d, the laser irradiation lines 32 are formed at intervals of n × PL = 4 × 4 = 16 mm. When the laser irradiation position in the first laser beam irradiation apparatus 20a is set to 0 mm, the formation positions of the laser irradiation lines 32 formed by the laser beam irradiation apparatuses 20b, 20c, and 20d are as follows.
In the first laser beam irradiation apparatus 20a, laser irradiation lines 32a are formed at positions of 0 mm, 16 mm, 32 mm, 48 mm, 64 mm, 80 mm, 96 mm, 112 mm,.
In the second laser beam irradiation apparatus 20b, laser irradiation lines 32b are formed at positions of 24 mm, 40 mm, 56 mm, 72 mm, 88 mm, 104 mm,.
In the third laser beam irradiation apparatus 20c, laser irradiation lines 32c are formed at positions of 36 mm, 52 mm, 68 mm, 84 mm, 100 mm,.
In the fourth laser beam irradiation apparatus 20d, laser irradiation lines 32d are formed at positions of 60 mm, 76 mm, 92 mm, 108 mm,.
In this way, by using the four laser beam irradiation apparatuses 20a, 20b, 20c, and 20d, the laser irradiation line 32 with PL = 4 mm is formed.

The control unit 18 detects the conveyance speed VL of the steel plate 31 from the tachometer 19 disposed on the support roll 11, and adjusts the movement speed VS of each laser beam irradiation device 20 according to the conveyance speed VL. is there. Furthermore, the control unit 18 determines whether or not each laser beam irradiation apparatus 20 is used.
In addition, the control unit 18 instructs the linear motion device 15 so that each laser beam irradiation device 20 moves along the transport direction while maintaining the distance D (m) between the laser beam irradiation devices 20 to be used. give.

Next, a method for producing a grain-oriented electrical steel sheet using the grain-oriented electrical steel sheet production apparatus 10 according to the present embodiment will be described.
In this embodiment, when n laser beam irradiation apparatuses 20 are used among the plurality of laser beam irradiation apparatuses 20, the conveyance speed VL of the steel plate 31 and the movement speed VS of the laser beam irradiation apparatus 20 in the conveyance direction are determined. Laser beam irradiation is performed by controlling the moving direction and moving speed VS of the laser beam irradiation apparatus 20 so that the relative speed VA becomes VA = n × VL ₀ .

Below, the control method of the moving speed VS of the laser beam irradiation apparatus 20 by the control part 18 is illustrated.
The n laser beam irradiation devices 20 are arranged in the conveyance direction of the steel plate 31, and the conveyance speed of the steel plate 31 when the laser irradiation line 32 is formed by using one laser beam irradiation device 20 is a reference conveyance speed. VL ₀ , k is an integer from 0 to n−1.

An example of the control method will be described. When the conveyance speed VL of the steel plate 31 is VL = (n−k) × VL ₀ , the laser beam irradiation device 20 is stopped using the (n−k) laser beam irradiation devices 20 and the laser is stopped. Beam irradiation is performed. Further, when the conveyance speed VL of the steel plate 31 is (n−k−1) × VL ₀ <VL <(n−k) × VL ₀ , (n−k) laser beam irradiation apparatuses 20 are used. Then, each laser beam irradiation device 20 is moved rearward in the conveyance direction, and the relative speed VA between the conveyance speed VL of the steel plate 31 and the movement speed VS of the laser beam irradiation device 20 is VA = (n−k) × VL _0. In this state, laser beam irradiation is performed.

Another example of the control method will be described. When the conveyance speed VL of the steel plate 31 is VL = (n−k) × VL ₀ , the laser beam irradiation device 20 is stopped using the (n−k) laser beam irradiation devices 20 and the laser is stopped. Beam irradiation is performed. Further, when the conveyance speed VL of the steel plate 31 is (n−k) × VL ₀ <VL <(n−k + 1) × VL ₀ , (n−k) laser beam irradiation apparatuses 20 are used. Each laser beam irradiation apparatus 20 is moved forward in the conveyance direction, and the relative speed VA between the conveyance speed VL of the steel plate 31 and the movement speed VS of the laser beam irradiation apparatus 20 is set to VA = (n−k) × VL ₀ . Laser beam irradiation is performed in the state.

Next, a method for controlling the laser beam irradiation apparatus 20 will be described with a specific example.
In the grain-oriented electrical steel sheet manufacturing apparatus 10 according to the present embodiment, during normal operation, laser beam irradiation is performed under the following steady conditions.
<Conveying speed VL> VL = 4 × VL ₀
<Number of devices used n> n = 4
<Laser irradiation conditions>
Laser output P P = P ₀
Scanning speed VC VC = VC ₀
Irradiation frequency f f = f ₀
Condensing shape dl × dc dl × dc = DL ₀ × DC ₀
Laser irradiation line pitch PL PL = PL ₀

Further, at the time of welding when the coil of the steel plate 31 is switched, the laser beam is irradiated under the following quasi-stationary conditions.
<Conveying speed VL> VL = VL ₀
<Number of devices used> n = 1
<Laser irradiation conditions>
Laser output P P = P ₀
Scanning speed VC VC = VC ₀
Irradiation frequency f f = f ₀
Condensing shape dl × dc dl × dc = DL ₀ × DC ₀
Laser irradiation line pitch PL PL = PL ₀

As described above, although the conveyance speed VL and the number n of the laser beam irradiation apparatuses 20 used differ between the steady condition and the unsteady condition, the laser irradiation conditions are the same.

First, the case of decelerating from a steady condition to a quasi-steady condition will be described with reference to the flowchart of FIG. 4 and the graph of FIG.
Under steady conditions, the laser irradiation line 32 is formed with the pitch PL = 4 mm using the four laser beam irradiation apparatuses 20a, 20b, 20c, and 20d at the conveyance speed VL = 4 × VL ₀ of the steel plate 31.

The conveyance speed VL is decelerated and becomes VL <4 × VL ₀ . Here, the control unit 18 detects the transport speed VL, calculates the moving speed VS of the laser beam irradiation device 20, and gives a command to the linear motion device 15. The linear motion device 15 moves the four laser beam irradiation devices 20a, 20b, 20c, and 20d that are being used toward the rear in the transport direction at a moving speed VS according to a command from the control unit 18. At this time, the laser beam irradiation devices 20a, 20b, 20c, and 20d are moved while maintaining the distance between them. As a result, the relative speed between the steel plate 31 and the laser irradiation apparatus 20 is set to 4 × VL ₀ and laser irradiation is performed. The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

When the conveyance speed VL becomes VL = 3 × VL ₀ , the laser beam irradiation device 20a on the rear side in the conveyance direction is stopped, and PL = 4 mm using the three laser beam irradiation devices 20b, 20c, and 20d. A laser irradiation line 32 is formed. In addition, the space | interval of laser beam irradiation apparatus 20b, 20c, 20d at this time is set by above-mentioned (1) Formula. The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

Furthermore, the conveyance speed VL is decelerated and becomes VL <3 × VL ₀ . The linear motion device 15 moves the three laser beam irradiation devices 20b, 20c, and 20d that are being used toward the rear in the transport direction at a moving speed VS according to a command from the control unit 18. At this time, the laser beam irradiation devices 20b, 20c, and 20d are moved while maintaining the distance between them. As a result, the relative speed between the steel plate 31 and the laser irradiation apparatus 20 is set to 3 × VL ₀ and laser irradiation is performed. The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

When the transport speed VL becomes VL = 2 × VL ₀ , the laser beam irradiation device 20b on the rear side in the transport direction is stopped, and laser irradiation is performed at PL = 4 mm using the two laser beam irradiation devices 20c and 20d. Line 32 is formed. The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

Further, the transport speed VL is decelerated and VL <2 × VL ₀ is satisfied. The linear motion device 15 moves the two laser beam irradiation devices 20c and 20d in use toward the rear in the transport direction at a moving speed VS according to a command from the control unit 18. Accordingly, the relative speed between the steel plate 31 and the laser irradiation devices 20 and 20d is set to 2 × VL _0, and laser irradiation is performed. The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

When the transport speed VL becomes VL = VL ₀ , the laser beam irradiation device 20c on the rear side in the transport direction is stopped, and the laser irradiation line 32 is formed with PL = 4 mm using one laser beam irradiation device 20d. To do.
In this manner, the conveyance speed VL is decelerated from the steady condition 4 × VL ₀ to the quasi-steady condition VL ₀ without changing the laser irradiation condition.
During the operation under this quasi-steady condition, the welding work of the coils of the steel plate 31 is performed.

  Next, when the welding of the coil of the steel plate 31 is completed, the conveyance speed VL is accelerated from the quasi-steady condition to the steady condition. The case of accelerating from the quasi-stationary condition to the steady condition will be described with reference to the flowchart of FIG. 6 and the graph of FIG.

The conveyance speed VL is accelerated and VL> VL ₀ is satisfied. Here, the control unit 18 detects the transport speed VL, calculates the moving speed VS of the laser beam irradiation device 20, and gives a command to the linear motion device 15. The linear motion device 15 moves the used laser beam irradiation device 20d forward in the transport direction at a moving speed VS according to a command from the control unit 18, and sets the relative speed between the steel plate 31 and the laser irradiation device 20d to VL. Laser irradiation is performed with _zero . The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

When the transport speed VL becomes VL = 2 × VL ₀ , the next laser beam irradiation device 20c is started, and the laser irradiation line 32 is set at PL = 4 mm using the two laser beam irradiation devices 20c and 20d. Form. In addition, the space | interval of laser beam irradiation apparatus 20c, 20d at this time is set by above-mentioned (1) Formula. Further, the laser irradiation conditions are the same as the steady conditions and the quasi-steady conditions.

Furthermore, the conveyance speed VL is accelerated and VL> 2 × VL ₀ is satisfied. The linear motion device 15 moves the two laser beam irradiation devices 20c and 20d used at a moving speed VS forward in the transport direction in response to a command from the control unit 18. At this time, the laser beam irradiation devices 20c and 20d are moved while maintaining the distance between them. Accordingly, the relative speed between the steel plate 31 and the laser irradiation devices 20c and 20d is set to 2 × VL _0, and laser irradiation is performed. The laser irradiation conditions are the same as the steady conditions and the quasi-steady conditions.

Then, when the conveyance speed VL becomes VL = 3 × VL ₀ , the next laser beam irradiation device 20b is activated, and the laser irradiation beam is PL = 4 mm using the three laser beam irradiation devices 20b, 20c, and 20d. 32 is formed. The interval between the laser beam irradiation devices 20b, 20c, and 20d at this time is set by the above-described equation (1). Further, the laser irradiation conditions are the same as the steady conditions and the quasi-steady conditions.

Furthermore, the conveyance speed VL is accelerated and VL> 3 × VL ₀ is satisfied. The three laser beam irradiation apparatuses 20b, 20c, and 20d that are being used are moved forward at the moving speed VS in the transport direction. At this time, the laser beam irradiation devices 20b, 20c, and 20d are moved while maintaining the distance between them. As a result, the relative speed between the steel plate 31 and the laser irradiation devices 20b, 20c, and 20d is set to 3 × VL _0, and laser irradiation is performed. The laser irradiation conditions are the same as the steady conditions and the quasi-steady conditions.

Then, when the conveyance speed VL becomes VL = 4 × VL ₀ , the next laser beam irradiation device 20a is activated, and laser is emitted at PL = 4 mm using the four laser beam irradiation devices 20a, 20b, 20c, and 20d. An irradiation line 32 is formed.
In this way, the conveyance speed VL is accelerated from the quasi-stationary condition VL ₀ to the steady condition 4 × VL ₀ without changing the laser irradiation condition.

In the grain-oriented electrical steel sheet manufacturing apparatus 10 according to the present embodiment configured as described above, a plurality of laser beam irradiation apparatuses 20 arranged in the transport direction at a time in the transport direction of the steel sheet 31. Laser beam irradiation can be performed at a location to form a laser irradiation line 32. In addition, since the linear motion device 15 that moves the laser beam irradiation device 20 along the conveyance direction is provided, the interval D (m) in the conveyance direction of each laser beam irradiation device 20 can be adjusted. Therefore, even if it is a case where the conveyance speed VL of the steel plate 31 is changed, the laser irradiation line 32 can be formed with the predetermined pitch PL.

  In addition, the grain-oriented electrical steel sheet manufacturing apparatus 10 according to the present embodiment adjusts the moving speed VS of the laser beam irradiation device 20 according to the conveyance speed VL of the steel sheet 31, so that the relative relationship between the steel sheet 31 and the laser beam irradiation apparatus 20 is adjusted. Since the control unit 18 that keeps the speed VA constant is provided, the laser irradiation is performed with the laser beam irradiation device 20 moved, so that the optimum laser irradiation condition is not changed and the predetermined pitch PL is maintained. The laser irradiation line 32 can be formed.

Furthermore, in this embodiment, when n laser beam irradiation apparatuses 20 are used, the relative speed VA between the conveyance speed VL of the steel plate 31 and the movement speed VS of the laser beam irradiation apparatus 20 in the conveyance direction is VA = n ×. Laser beam irradiation is performed by controlling the moving direction and moving speed VS of the laser beam irradiation apparatus 20 so that VL ₀ is obtained. Therefore, even if the conveyance speed VL of the steel plate 31 changes, the laser irradiation lines 32 can be formed at a predetermined pitch PL without changing the optimum laser irradiation conditions in each laser beam irradiation apparatus 20.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, although it has been described that a laser beam capable of fiber transmission is used, the present invention is not limited to this, and a carbon dioxide laser or the like may be used. In this case, a laser device is provided for each laser beam irradiation device.
Further, the laser beam is transmitted from one laser apparatus to four laser irradiation apparatuses, but the present invention is not limited to this, and two or more laser apparatuses may be used.

In addition, the laser beam irradiation device has been described as moving in the transport direction using a linear motion device, but the present invention is not limited to this, and the laser beam irradiation device is moved in the transport direction by another moving mechanism. There may be.
Further, when the steel plate is wide, a plurality of laser beam irradiation devices may be arranged in the width direction as shown in FIG.

According to the present invention, even when the conveyance speed of the steel sheet changes, the direction in which laser irradiation lines can be formed at a predetermined pitch without changing the optimum laser irradiation conditions in each laser beam irradiation apparatus. The manufacturing apparatus and manufacturing method of a heat-resistant electrical steel sheet can be provided.

10. Manufacturing method of grain-oriented electrical steel sheet 15 Linear motion device (transport direction moving mechanism)
18 Control unit 20 Laser beam irradiation device 31 Steel plate 32 Laser irradiation line

The grain-oriented electrical steel sheet manufacturing apparatus of the present invention is a grain-oriented electrical steel sheet manufacturing apparatus that manufactures magnetic domain-controlled grain-oriented electrical steel sheets by irradiating a laser beam, and is provided in a plurality in the conveying direction of the steel sheets. The laser beam irradiation apparatus, a conveyance direction moving mechanism for moving these laser beam irradiation apparatuses in the conveyance direction of the steel sheet, and adjusting the moving speed of each laser beam irradiation apparatus according to the conveyance speed of the steel sheet, A control unit for maintaining a constant relative speed between the steel plate and the laser beam irradiation device, and using a single laser beam irradiation device as a reference for the conveyance speed of the steel plate when forming a laser irradiation line When the transport speed VL is ₀ , the controller, when using n laser beam irradiation apparatuses, transports the steel sheet transport speed VL and the movement speed VS of the laser beam irradiation apparatus in the transport direction. The laser beam irradiation is performed by controlling the moving direction and the moving speed VS of the laser beam irradiation apparatus so that the relative speed VA becomes VA = n × VL ₀ .

Further, in accordance with the conveyance speed of the steel sheet, by adjusting the moving speed of the laser beam irradiation apparatus, since the relative velocity between the said steel plate laser beam irradiation apparatus has a control unit which holds constant, the steel plate Even if the conveyance speed is changed, the relative speed between the steel plate and the laser beam irradiation apparatus can be kept constant by adjusting the moving speed of the laser beam irradiation apparatus according to the actual conveyance speed. . Then, by performing laser irradiation in a state where the relative speed between the steel plate and the laser beam irradiation apparatus is kept constant, it is possible to form a laser irradiation line without changing the laser irradiation conditions optimal for magnetic domain control. it can.

Further, when the conveying speed of the steel sheet when forming the laser irradiation line by using one laser beam irradiation apparatus is set to the reference conveying speed VL ₀ , the control unit uses n laser beam irradiation apparatuses. In this case, the moving direction and moving speed of the laser beam irradiation apparatus are set so that the relative speed VA between the conveying speed VL of the steel plate and the moving speed VS in the conveying direction of the laser beam irradiation apparatus is VA = n × VL _0. It is doing the irradiation of the laser beam to control the VS.
In this case, the control unit sets the number of laser beam irradiation devices used and the moving speed VS of the laser beam irradiation devices in accordance with the steel plate conveyance speed VL. Thus, the relative velocity VA of the steel plate and the laser beam irradiation apparatus, the product of the number n and the reference transport speed VL ₀ of the laser beam irradiation apparatus used. Therefore, in the laser beam irradiation device, it can be irradiated with the laser beam at the optimal laser irradiation conditions to the magnetic domain control at reference transportation speed VL _0.

Here, in the manufacturing apparatus for grain-oriented electrical steel sheets according to the present invention, when a plurality (n units) of the laser irradiation devices are used, the laser irradiation devices are positioned on the rearmost side in the transport direction. The interval D (m) between the irradiation position of the laser beam irradiation apparatus and the irradiation position of the mth laser irradiation apparatus located in front of the conveyance direction is PL as the pitch of the laser irradiation lines of the directional electromagnetic steel sheet. In this case, it is preferable that the following relational expression is satisfied.
D (m) = n × h (m) × PL + q × PL
m: integer satisfying 2 ≦ m ≦ n
h (x): 0 or any positive integer. However, in x1 <x2, h (x1) <h (x2)
q: An integer that satisfies 1 ≦ q ≦ n−1 and does not take the same value at different m.

The grain-oriented electrical steel sheet manufacturing method of the present invention is a grain-oriented electrical steel sheet manufacturing method for manufacturing a grain-oriented magnetic steel sheet controlled by irradiating a laser beam. Each having a laser beam irradiation device that is movable in the conveyance direction of the steel plate, and using the single laser beam irradiation device to form the laser irradiation line, the conveyance rate of the steel plate is the reference conveyance speed VL _0. When n laser beam irradiation apparatuses are used, the relative speed VA between the conveyance speed VL of the steel sheet and the movement speed VS in the conveyance direction of the laser beam irradiation apparatus is VA = n × VL _0. As described above, the laser beam irradiation is performed by controlling the moving direction and moving speed VS of the laser beam irradiation apparatus.
In this case, the relative velocity VA of the steel plate and the laser beam irradiation apparatus, the product of the number n and the reference transport speed VL ₀ of the laser beam irradiation apparatus used. Therefore, in the laser beam irradiation device, it can be irradiated with the laser beam at the optimal laser irradiation conditions to the magnetic domain control at reference transportation speed VL _0.

Here, in the method for manufacturing a grain-oriented electrical steel sheet according to the present invention, when a plurality (n units) of the laser irradiation devices are used, the laser irradiation devices are positioned on the rearmost side in the transport direction. The interval D (m) between the irradiation position of the laser beam irradiation apparatus and the irradiation position of the mth laser irradiation apparatus located in front of the conveyance direction is PL as the pitch of the laser irradiation lines of the directional electromagnetic steel sheet. In this case, it is preferable that the following relational expression is satisfied.
D (m) = n × h (m) × PL + q × PL
m: integer satisfying 2 ≦ m ≦ n
h (x): 0 or any positive integer. However, in x1 <x2, h (x1) <h (x2)
q: An integer that satisfies 1 ≦ q ≦ n−1 and does not take the same value at different m.

The control unit 18 detects the conveyance speed VL of the steel plate 31 from the tachometer 9 disposed on the support roll 11, and adjusts the movement speed VS of each laser beam irradiation device 20 according to the conveyance speed VL. is there. Furthermore, the control unit 18 determines whether or not each laser beam irradiation apparatus 20 is used.
In addition, the control unit 18 instructs the linear motion device 15 so that each laser beam irradiation device 20 moves along the transport direction while maintaining the distance D (m) between the laser beam irradiation devices 20 to be used. give.

As described above, in the steady condition and the quasi- steady condition, the conveyance speed VL and the number n of the laser beam irradiation apparatuses 20 used are different, but the laser irradiation conditions are the same.

Further, the transport speed VL is decelerated and VL <2 × VL ₀ is satisfied. The linear motion device 15 moves the two laser beam irradiation devices 20c and 20d in use toward the rear in the transport direction at a moving speed VS according to a command from the control unit 18. As a result, the relative speed between the steel plate 31 and the laser irradiation devices 20 c and 20 d is set to 2 × VL ₀ and laser irradiation is performed. The laser irradiation conditions at this time are the same as the steady conditions and the quasi-steady conditions.

10 Directional electrical steel sheet manufacturing equipment 15 Linear motion device (transport direction moving mechanism)
18 Control unit 20 Laser beam irradiation device 31 Steel plate 32 Laser irradiation line

Claims (4)

An apparatus for producing a grain-oriented electrical steel sheet for producing a grain-oriented electrical steel sheet controlled by irradiating a laser beam,
A grain-oriented electrical steel sheet, comprising: a plurality of laser beam irradiation apparatuses arranged in a conveyance direction of a steel sheet; and a conveyance direction moving mechanism that moves these laser beam irradiation apparatuses in the conveyance direction of the steel sheet. manufacturing device. It is a manufacturing apparatus of the grain-oriented electrical steel sheet according to claim 1,
A control unit is provided that adjusts the moving speed of each laser beam irradiation apparatus according to the conveying speed of the steel sheet, and keeps the relative speed between the steel sheet and the laser beam irradiation apparatus constant. It is a manufacturing apparatus of the grain-oriented electrical steel sheet according to claim 2,
When the conveying speed of the steel plate when forming the laser irradiation line using one of the laser beam irradiation devices is set to the reference conveying speed VL ₀ ,
When the control unit uses n laser beam irradiation apparatuses, the relative speed VA between the conveyance speed VL of the steel sheet and the movement speed VS in the conveyance direction of the laser beam irradiation apparatus is VA = n × VL ₀ . Thus, the laser beam irradiation is performed by controlling the moving direction and moving speed VS of the laser beam irradiation apparatus. A method for producing a grain-oriented electrical steel sheet for producing a grain-oriented electrical steel sheet controlled by irradiating a laser beam,
Plural units are arranged in the conveying direction of the steel plate, each having a laser beam irradiation device movable in the conveying direction of the steel plate,
When the conveying speed of the steel plate when forming the laser irradiation line using one of the laser beam irradiation devices is set to the reference conveying speed VL ₀ ,
When using n laser beam irradiation apparatuses, the relative speed VA between the conveyance speed VL of the steel sheet and the movement speed VS in the conveyance direction of the laser beam irradiation apparatus is VA = n × VL _0. A method of manufacturing a grain-oriented electrical steel sheet, wherein a laser beam is irradiated by controlling a moving direction and a moving speed VS of a laser beam irradiation apparatus.

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