JP4814558B2 - Induction heating device for side trimmer - Google Patents

Description

  The present invention relates to an induction heating apparatus for heating a rolled material or other heated material in a process line, and more particularly to an induction heating apparatus for a side trimmer for the purpose of preventing ear cracks during side trimming and improving the quality of a cut surface. About.

  In the process line, in order to make the sheet width of the material to be rolled uniform according to the application of the product, side trimming is performed by a side trimmer to cut both sides of the material to be rolled to obtain a product with a predetermined width.

Conventionally, when trimming both edges in the direction of travel of a rolled material such as a silicon steel plate, it is necessary to trim the rolled material by heating the plate edge using a gas burner or heating the entire plate using a heating furnace. It was heated to a certain temperature. For example, when trimming the edge part of an austenitic stainless steel strip that has passed through a continuous annealing pickling line after hot rolling, by heating the plate end in a heating furnace using a gas burner as the heating source, the steel strip side edge There was a thing which prevented the ear crack of (refer patent document 1).
JP-A-8-71609

  However, the conventional heating method using a flame requires a large installation space with respect to the longitudinal direction of the line. In addition, it is difficult to control the end temperature of the material to be heated to the optimum heating temperature for trimming in accordance with the line conveyance speed, the plate thickness, and the material.

  The present invention has been proposed to solve the problems of the prior art as described above, and its purpose is to prevent and cut ear cracks in side trimming of a silicon steel sheet in a process line for a silicon steel sheet having a side trimmer. An object of the present invention is to provide an induction heating apparatus for a side trimmer capable of improving the quality of a surface.

In order to achieve the above object, the invention of claim 1 is characterized by the following points.
  (a) a pinch roller that sandwiches a belt-shaped material to be heated and travels in the length direction thereof;
  (b) a C-type inductor disposed on both side portions in the width direction of the belt-shaped material to be heated;
  (c) a carriage that moves the C-type inductor in the width direction of the material to be heated;
  (d) During operation of the C-type inductor, an axial current flowing through the pinch roller generated by an eddy current generated in the material to be heated by the C-type inductor is detected, and the cart is detected by a position correction signal based on the axial current value. A moving control unit,
  (e) A side trimmer for trimming an edge of the heated material heated by the C-type inductor is provided at a stage subsequent to the C-type inductor in the heated material.

The invention of claim 2 is characterized by the following points.
  (a) a pinch roller that sandwiches a belt-shaped material to be heated and travels in the length direction thereof;
  (b) a C-type inductor disposed on both side portions in the width direction of the belt-shaped material to be heated;
  (c) a steering roller for moving the material to be heated in its width direction;
  (d) During operation of the C-type inductor, an axial current flowing in the pinch roller generated by an eddy current generated in the material to be heated by the C-type inductor is detected, and the steering roller is detected by a position correction signal based on the axial current value. And a control unit for controlling the amount of movement of the material to be heated in the width direction by
  (e) A side trimmer for trimming an edge of the heated material heated by the C-type inductor is provided at a stage subsequent to the C-type inductor in the heated material.

In both the first and second aspects of the present invention, the material to be heated is detected based on the detected value by detecting the axial current flowing in the pinch roller for conveying the belt-shaped material to be heated. Alternatively, by controlling the movement amount of the C-type inductor, it is possible to maintain an appropriate position between the material to be heated and the C-type inductor.

  According to the present invention, it is possible to finely carry out temperature control optimal for trimming, compared with conventional heating of the edge portion of the material to be heated by a flame, high reproducibility of optimal trimming conditions, It is possible to provide an induction heating apparatus for a side trimmer that is highly effective in preventing ear cracking and improving the quality of the cut surface during side trimming of the material to be heated.

  Next, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be specifically described with reference to the drawings.

(1) Embodiment (1-1) Configuration As shown in FIG. 1, the induction heating apparatus for a side trimmer of this embodiment is a pinch roll that sandwiches and conveys C-type inductors 1a and 1b and a material to be heated M. 2a and 2b are provided on the input side and the output side of the C-type inductors 1a and 1b, respectively. A steering roll 30 is provided on the upstream side of the pinch roll 2a to adjust the relative position in the width direction of the material to be heated M by moving the plate. Furthermore, side trimmers 40a and 40b for trimming both side portions of the material to be heated M heated by the C-type inductors 1a and 1b are provided on the downstream side of the pinch roll 2b. That is, in the present embodiment, the C-type inductors 1 a and 1 b are provided between the steering roll 30 and the side trimmer 40. As the material to be heated in this embodiment, a silicon steel plate is suitable.

[Configuration of C-type inductor]
The C-type inductor 1 is a means for heating the left and right edges of the material to be heated M by a transverse method. The heating temperature is calculated from the thickness and material of the material to be heated, and is heated by the controller. By performing power control, the material end temperature is heated from 100 ° C. to around 150 ° C.

  Here, when a silicon steel plate is assumed as the material to be heated, since the silicon steel plate is a hard and brittle material at room temperature, good side trimming cannot be performed unless the temperature is about 80 ° C. or higher. On the other hand, if the temperature is much higher than 300 ° C., dripping due to thermal deformation will occur. Further, heat radiation in the line and heat removal by a transport roll are also conceivable. Therefore, in this embodiment, the material to be heated is heated at 100 ° C. to 150 ° C. That is, the temperature condition takes into account the margin of trimming temperature and the occurrence of thermal deformation.

More specifically, the heating power is calculated by the following equation.
(Formula 1)
Heating power [kW] = heating power correction coefficient α × speed correction coefficient β × temperature increase [° C.] × plate thickness [mm]
Therefore, if α is obtained in advance by a heating test using a reference material, the heating power setting can be made by calculating the heating power from the above formula even if the plate thickness of the material to be heated and the required temperature rise value change. It is possible to change.

  As shown in FIG. 1, the C-type inductors 1a and 1b have a configuration in which heating coils 5a and 5b are wound around upper and lower C-type iron cores 4a and 4b with an opening 3 interposed therebetween. As shown in FIG. 2, the C-type inductors 1a and 1b are mounted on carts 6a and 6b. The carts 6a and 6b are provided with moving wheels 7, and rails 8 (not shown in FIG. 1). It is configured to be movable in the width direction of the material to be heated M by driving the motors 9a and 9b.

  FIG. 2 shows details of the C-type inductors 1a and 1b and the carriages 6a and 6b on which they are mounted. The carriages 6a and 6b are equipped with carriage position detection devices 10a and 10b for detecting the relative position in the width direction of the heated material M of the carriage, and based on the carriage positions detected by the carriage position detection devices 10a and 10b. Then, the control device 11 issues an adjustment command to the motor control device 12. The motors 9a and 9b are driven by the motor control device 12, and the positions of the carriages 6a and 6b are adjusted by moving the moving wheels 7 on the rails 8. The carts 6a and 6b of the C-type inductors 1a and 1b are independently controlled, and are heated according to the plate width of the material to be heated M or by heating the C-type inductor 1 described later. The position is adjusted according to the balance of the eddy current generated in the material M.

[Configuration of pinch roll and circulating cable]
As shown in the side view of FIG. 3, the pinch rolls 2a and 2b provided on the entry side and the exit side of the C-type inductors 1a and 1b hold and convey the material M to be heated from the vertical direction, The material to be heated is configured to be stably conveyed through the centers of the upper and lower gaps of the C-type inductors 1a and 1b.

  Further, as shown in FIGS. 4A and 4B, slip rings 21a and 21b made of current collecting rings fixed to the rotation shafts of the pinch rolls are provided at both edge portions of the pinch rolls 2a and 2b, respectively. Earth brushes 22a and 22b are provided which are in sliding contact with the rings 21a and 21b and are electrically connected to the terminals. A circulation cable 23 is attached to the ground brushes 22a and 22b. When an axial current is generated, the current flows from the pinch roll 2a through the slip ring 21a, 21b and the ground brush 22a, 22b through the circulation cable 23 and circulates to the other pinch roll 2b. ing.

  Further, as shown in FIG. 1, an axial current detection device 24 and an axial current measurement device 25 for detecting a current flowing through the circulation cable 23 are provided in the middle of the circulation cable 23. The signal line 26 is connected to the control device 11. The control device 11 is connected to a calculation result display device D which is a display device represented by a human machine interface.

[Steering roll configuration]
As shown in FIG. 1, a steering roll 30 is provided on the upstream side of the pinch roll 2a to adjust the relative position of the heated material M in the width direction by moving the heated material M. As shown in FIG. 5, the steering roll 30 is provided with two holding rollers 31 a and 31 b fixed in the horizontal direction on the lower side of the material to be heated M, and on the upper side by a jack 33. One position adjusting roller 32 provided with one end portion being movable in the horizontal direction is provided. As described above, the position adjustment roller 32 is heated by changing the contact surface with the heated material M on the holding rollers 31a and 31b by moving one end in the horizontal direction by the jack 33. The width direction L, R position of the material M is moved.

  Further, the steering roll 30 is provided with a position detection device 34 for detecting the position of the material to be heated M, and the position detection device 34 and the steering roll 30 are connected to the control device 11.

[Configuration of side trimmer]
The side trimmer 40 is means for trimming both edges in the width direction of the material to be heated M on the downstream side of the pinch roll 2b, and two side portions 40a and 40b are provided on both right and left sides in the traveling direction of the material to be heated M. Yes. Further, the side trimmers 40a and 40b are each composed of a pair of upper and lower sides, and the cutters provided on the upper and lower sides are configured to be rotatable while being displaced in the direction of the rotation axis.

(1-2) Operational Effects The operational effects of the present embodiment having the above configuration will be described.
The material to be heated M sent to the process line of the present embodiment is sent to the pinch roll 2 a and the C-type inductor 1 side while the relative position in the width direction is adjusted by the steering roll 30.

  In the C-type inductor 1, the magnetic flux Φ generated from the left and right inductors 1 a and 1 b is linked to the material to be heated M, thereby generating an eddy current I as shown in FIG. Joule heat is generated to heat both edge portions of the material M to be heated. At this time, the center of the gap between the C-type inductors 1a and 1b is transported by pinching rolls 2a and 2b to sandwich the material M to be heated from the vertical direction on the entry side and the exit side of the C-type inductor 1. The material M to be heated is stably conveyed. Thereby, when the gap is stabilized, the heating efficiency can be kept constant, and the material to be heated M is stably heated.

  Here, the currents applied to the heating coils 5a and 5b have the same phase and reverse current, and the directions of the eddy currents I generated at both edge portions across the center in the longitudinal direction of the material M to be heated are opposite. Therefore, if the positional relationship between the C-type inductor and the material to be heated M is the same for both C-type inductors, that is, if the C-type inductors 1a and 1b are in symmetrical positions with respect to the center in the longitudinal direction of the material to be heated M, Axial currents do not cancel each other. On the other hand, an axial current is generated when the positional relationship between the material to be heated M and the C-type inductor sandwiches the center of the material to be heated M and the symmetry is lost. When the axial current is generated, the current flows from the pinch roll 2a through the slip rings 21a and 21b and the earth brushes 22a and 22b through the current circulation cable and circulates to the other pinch roll 2b.

  Further, as shown in FIG. 5, the steering roll 30 has one end portion X of the position adjusting roller 32 that has a predetermined position determined by the action of the jack 33 based on the position correction signal based on the shaft current value detected by the control device 11. The material to be heated M is moved in the L direction on the left side in the transport direction.

  Similarly, position correction processing is also performed on the C-type inductor 1. That is, when a position correction signal is output to the C-type inductors 1a and 1b based on the shaft current value detected by the control device 11, the C-type inductors 1a and 1b are connected to the carts 6a and 1b based on the position correction signal. 6b and the moving wheel 7 are moved by a predetermined amount in a predetermined direction, for example, L direction.

  Here, the shaft current value in the control device 11 is generated as follows. First, when an axial current is detected by the axial current detection device 24, the axial current measurement device 25 converts it into a signal corresponding to the current value. Next, this signal passes through the signal line 26 and is input to the control device 11 to calculate the current value (see FIG. 1). The calculated shaft current value is displayed on the calculation result display device D connected to the control device 11. Next, the control device 11 detects the shaft current value that changes with the movement from the shaft current detection device 24 and the shaft current measurement device 25, and the shaft current value before the material to be heated M moved by the steering roll 30 ( Compare 1) with the shaft current value (2) after movement. Here, when the pre-movement shaft current value (1) is smaller than the post-movement shaft current (2), the end portion X of the position adjustment roller 32 of the steering roll 30 is moved downward to reverse the material to be heated M. Move in the R direction. When the post-movement axial current (3) is smaller than the pre-movement axial current (1) again, the material to be heated M is further moved in the same direction. In this way, while constantly detecting the difference in the axial current, the above process is repeated and finally the axial current value is set to 0, that is, the C-type inductors 1a and 1b are based on the longitudinal center of the material to be heated. Correct so that it is located symmetrically.

  The gap between the material to be heated M and the C-type inductor 1 can be kept constant by the steering roll 30 and the position correction document for the C-type inductor 1, so that the left and right edges of the direction of the material to be heated M are stabilized. Then, the edge portion of the heated material M to be heated is trimmed by the side trimmer 40 on the downstream side of the pinch roll 2b.

  According to the present embodiment that operates as described above, pinch rolls 2 a and 2 b are further provided before and after the C-type inductor 1 on the assumption that the C-type inductor 1 is installed between the steering roll 30 and the side trimmer 40. By keeping the gap between the material to be heated and the C-type inductor 1 constant, the material to be heated can be stably heated. Therefore, it is possible to finely control the optimum temperature control for trimming in the side trimmer 40 as compared with the preheating by the conventional flame, and the reproducibility of the optimum trimming condition is high, and the side trimming of the material M to be heated is performed. While preventing cracks at the time, it is possible to improve the quality of the cut surface.

(2) Other Embodiments The present invention is not limited to the above-described embodiments, and includes other embodiments as described below. For example, in the above-described embodiment, the side trimmer induction heating apparatus provided with both the position correction means for the C-type inductor and the position correction means for the material to be heated M is shown, but the present invention is not limited to this. As shown in FIG. 7, only the steering roll 30 of the material to be heated, which is a position correction unit for the material to be heated M, may be provided. On the other hand, as shown in FIG. 7, it is possible to configure only with the moving means of the C-type inductor.

  Further, the moving means of the C-type inductor or the moving means of the material to be heated M is merely one aspect for carrying out the present invention, and any other means can be used as long as it moves the C-type inductor to the relative position in the width direction. It can be configured by any known means.

The figure which shows the whole structure of the induction heating apparatus for side trimmers in embodiment of this invention. The schematic diagram which shows the structure of the C-type inductor in embodiment of this invention. The figure which shows the structure of the pinch roll in embodiment of this invention. The figure which shows the structure of the pinch roll and circulation cable in embodiment of this invention. The figure which shows the structure of the steering roll in embodiment of this invention. The conceptual diagram which shows the eddy current which generate | occur | produces in the induction heating apparatus for side trimmers in embodiment of this invention. The figure which shows the whole structure of the induction heating apparatus for side trimmers in other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... C type inductor 2a, 2b ... Pinch roll 4a, 4b ... C type iron core 5a, 5b ... Heating coil 6a, 6b ... Carriage 7 ... Moving wheel 8 ... Rail 9a, 9b ... Motor 10a, 10b ... Dolly position detecting device 11 ... Control device 12 ... Motor control devices 21a, 21b ... Slip rings 22a, 22b ... Earth brush 23 ... Circulating cable 24 ... Axial current detecting device 25 ... Axial current measuring device 26 ... Signal line 30 ... Steering roll 31a , 31b ... Holding roller 32 ... Position adjusting roller 33 ... Jack 34 ... Position detecting device 40, 40a, 40b ... Side trimmer D ... Calculation result display device

Claims (2)

(a) a pinch roller that sandwiches a belt-shaped material to be heated and travels in the length direction thereof;
  (b) a C-type inductor disposed on both side portions in the width direction of the belt-shaped material to be heated;
  (c) a carriage that moves the C-type inductor in the width direction of the material to be heated;
  (d) During operation of the C-type inductor, an axial current flowing through the pinch roller generated by an eddy current generated in the material to be heated by the C-type inductor is detected, and the cart is detected by a position correction signal based on the axial current value. A moving control unit,
  (e) An induction heating apparatus for a side trimmer, wherein a side trimmer for trimming an edge of the heated material heated by the C-type inductor is provided at a subsequent stage of the C-type inductor in the heated material. (a) a pinch roller that sandwiches a belt-shaped material to be heated and travels in the length direction thereof;
  (b) a C-type inductor disposed on both side portions in the width direction of the belt-shaped material to be heated;
  (c) a steering roller for moving the material to be heated in its width direction;
  (d) During operation of the C-type inductor, an axial current flowing in the pinch roller generated by an eddy current generated in the material to be heated by the C-type inductor is detected, and the steering roller is detected by a position correction signal based on the axial current value. And a control unit for controlling the amount of movement of the material to be heated in the width direction by
  (e) An induction heating apparatus for a side trimmer, wherein a side trimmer for trimming an edge of the heated material heated by the C-type inductor is provided at a subsequent stage of the C-type inductor in the heated material.

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