JP4855835B2 - Manufacturing method of painted metal strip - Google Patents

Description

  The present invention relates to a method for producing a coated metal strip in which a long metal strip is conveyed and a paint is applied to the lower surface thereof.

  While a metal strip such as a long steel strip is being transported, a lower coater is brought into contact with the lower coat and applied (see, for example, Patent Documents 1 to 3), but a uniform coating on the metal strip In order to make the formation of the film uniform, a metal strip is attracted to the roll coater side by providing a magnet on the roll coater side, incorporating a magnet in the roll coater, or forming the roll coater itself with a magnet. I am doing so. Thereby, the contact property between the metal strip and the roll coater is increased, and a uniform coating film is easily formed.

However, as shown in FIG. 4A, a plurality of magnets 4, 4... Are arranged in the width direction of the metal band 1 (a direction orthogonal to the transport direction of the metal band 1) and the magnet 4 below the metal band 1. When the magnetic poles on the metal band 1 side of 4... Are alternately made up of N poles and S poles, the metal band 1 follows the magnetic field lines M along the magnetic field lines M as shown in FIG. Since the metal strip 1 is deformed into a shape, the metal strip 1 may be undulated. As a result, there is a problem that an unpainted portion is generated on the metal strip 1. Further, as shown in FIG. 5, when one magnet 4 that is long in the width direction of the metal strip 1 is disposed below the metal strip 1, the magnet 4 has the strongest magnetic force as a characteristic of the magnet 4. Both side end portions 3 and 3 of the band 1 are raised, and as a result, there is a problem that an unpainted portion is generated at the side end portion 3 of the metal band 1.
JP-A-57-32755 Japanese Patent Laid-Open No. 2-115065 JP-A-4-187260

  This invention is made | formed in view of said point, and it aims at providing the manufacturing method of the coating metal strip which can make an unpainted part hard to produce in the side edge part of a metal strip.

Method for manufacturing a coated metal strip of the present invention is a method of manufacturing a coated metal strip to be coated by contacting the roll coater 2 to the lower surface while conveying the metal strip 1, the lower side edge 3,3 of the metal strip 1 The magnets 4 and 4 are positioned from the outer side to the outer side of the metal strip 1 so that only the both side end portions 3 and 3 in the width direction of the metal strip 1 are coated while being attracted to the roll coater 2 side by the magnets 4 and 4. To do.

In the present invention , the magnets 4 , 4 are preferably formed so as to be movable toward and away from the side ends 3, 3 of the metal strip 1 and to be movable in the width direction relative to the lower surface of the metal strip 1. .

  In the invention according to the first aspect of the present invention, since only the side end portions 3 and 3 of the metal strip 1 are coated while being attracted to the roll coater 2 side by the magnets 4 and 4, the metal strip 1 is waved or faced downward. The roll coater 2 can be easily brought into contact with the lower surface of the side end portion 3 even if the side end portions 3 and 3 of the metal band 1 are wavy, without being curved convexly. An unpainted portion is less likely to occur at the side end portion 3 of the belt 1.

Further, in the invention according to claim 1 of the present invention, some of meandering metal strip 1 (walking) is sucked magnet 4 is not easily disconnected for the side end portion 3 of the metal strip 1 even if, the metal strip 1 The contact property of the roll coater 2 with respect to the lower surfaces of both side end portions 3 and 3 is less likely to be impaired, and an unpainted portion is less likely to occur at the side end portion 3 of the metal strip 1.

In the invention according to claim 2 of the present invention, the positions of the magnets 4 and 4 can be easily changed according to the thickness and the meandering condition of the metal strip 1, and an unpainted portion is formed on the side end portion 3 of the metal strip 1. It becomes harder to occur.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 2 shows a coating apparatus used in the present invention. Reference numeral 10 denotes a backup roll. A surface coating applicator roll 11 is arranged on one side of the backup roll 10 and a surface coating pickup roll 12 is arranged on the side of the surface coating applicator roll 11. It is installed. Further, a back coating applicator roll 13 as a roll coater 2 is arranged on the other side of the backup roll 10, and a back coating pick-up roll 14 is arranged on the side of the back coating applicator roll 13. It is installed. A magnet installation device 15 is provided between the back surface applicator roll 13 and the backup roll 10. A support roll 16 is disposed between the magnet installation device 15 and the backup roll 10.

  As shown in FIG. 1, the magnet installation device 15 includes a pair of magnets 4, 4, a vertical driving unit 20, and a pair of left and right width driving units 21. The vertical drive unit 20 includes a vertical position adjustment handle 30, a rotary shaft 31 attached to the vertical position adjustment handle 30, a pair of pinions 32 and 32 attached to the rotary shaft 31, and a direction parallel to the axial direction of the rotary shaft 31. A long base 33 and racks 34, 34 provided on the base 33 so as to mesh with the pinions 32 are formed.

  The pair of width direction drive units 21 are installed on the upper side of the base 33, and each width direction drive unit 21 includes a width direction position adjustment handle 40 and a screwed rotation shaft 41 attached to the width direction position adjustment handle 40. In order to support the threaded rotary shaft 41 on the upper surface of the base 33, a support portion 42 and a moving body 43 screwed to the threaded rotary shaft 41 are formed. The magnets 4 and 4 are attached on each moving body 43. A permanent magnet can be used as the magnet 4, and the magnetic flux density can be about 4000 G, but is not limited thereto. The magnetic pole on the upper surface side of one magnet 4 and the magnetic pole on the upper surface side of the other magnet 4 are made different.

  In the above-described magnet installation device 15, the vertical position adjustment handle 30 is rotated to rotate the rotating shaft 31 and the pinions 32, 32, and the racks 34, 34 and the base 33 are moved vertically by the rotation of the pinions 32, 32. Try to move it. The necessary range of movement of the magnet 4 in the vertical direction is set such that the upper surface of the magnet 4 is located on the pass line (position where the metal strip 1 is conveyed), and the upper surface of the magnet 4 is located 50 mm below the pass line. Can be the lower limit. Moreover, in said magnet installation apparatus 15, since the movement range required in the width direction (left-right direction) of each magnet 4 respond | corresponds to the width dimension 610-1320mm of the metal strip 1, it is preferable to set it as about 400 mm. However, the present invention is not limited to this. The size of the magnet 4 can be 110 mm in width (parallel to the width direction of the metal strip 1) and 50 mm in length (in parallel to the transport direction of the metal strip 1), but is not limited thereto. It is not a thing.

  The magnet installation device 15 is installed between the back surface applicator roll 13 and the backup roll 10, but the axial direction of the rotary shaft 31, the axial direction of the screwed rotary shaft 41, and the rotation of the backup roll 10. Axial direction of driving, axial direction of rotational drive of surface coating applicator roll 11, axial direction of rotational driving of surface coating pickup roll 12, axial direction of rotational driving of back surface applicator roll 13, pickup for back surface coating The axial direction of the rotational drive of the roll 14 and the axial direction of the rotational drive of the support roll 16 are all parallel, and these axial directions and the width direction of the metal strip 1 to be transported (perpendicular to the transport direction of the metal strip 1). Direction). Moreover, it is preferable to install the magnet installation apparatus 15 in the vicinity of the applicator roll 13 for back surface coating.

  When painting while conveying a metal strip (strip) 1 such as a long steel strip with the coating apparatus formed as described above, the following is performed. First, the surface coating 51 is applied to the entire surface of the metal band 1 by passing the metal band 1 vertically between the backup roll 10 and the surface coating applicator roll 11 while continuously conveying the metal band 1 in the longitudinal direction. Apply. At this time, the peripheral surface of the backup roll 10 is in contact with the back surface of the metal band 1 while rotating, and the peripheral surface of the applicator roll 11 for surface coating is in contact with the surface of the metal band 1 while rotating. The surface coating pickup roll 12 pulls up the surface coating 51 in the coating pan 50 while rotating, and the surface coating 51 is attached to the peripheral surface of the surface coating applicator roll 11 by contact and supplied.

  Next, the metal strip 1 to which the surface coating 51 is applied is changed to a substantially horizontal direction by the backup roll 10 so that the back surface thereof faces downward, and the support roll 16, the magnet installation device 15, and the back surface coating are applied. The metal strip 1 is transported so as to pass above the applicator roll 13. And when the metal strip 1 passes the upper side of the applicator roll 13 for back surface coating, the back surface (lower surface) of the metal band 1 contacts the peripheral surface of the rotating applicator roll 13 for rotation, and thereby The back surface coating 52 is applied to the entire back surface of the metal strip 1. Further, the back surface coating pick-up roll 14 pulls up the back surface coating material 52 in the coating material pan 53 while rotating, and the back surface coating material 52 is supplied to the peripheral surface of the back surface coating applicator roll 13 by contact. In addition, after the back surface coating 52 is apply | coated to the back surface, the metal strip 1 is conveyed to a heating furnace, and the surface coating 51 and the back surface coating 52 are hardened by heating. In this way, a coated metal strip can be manufactured.

  When the metal strip 1 is coated while being transported as described above, only the side end portions 3 and 3 in the width direction of the metal strip 1 are displaced downward by the magnets 4 and 4. Sucked into. Here, in the present invention, the side end portion 3 of the metal strip 1 means a side end portion having a width of 200 mm from the side end face (edge) of the metal strip 1. Therefore, the magnets 4 and 4 are positioned one by one only on the lower side of the side end portions 3 and 3 of the metal band 1, and a portion (substantially central portion) excluding both side end portions 3 and 3 of the metal band 1. The magnet 4 is not arranged on the lower side. When the magnet 4 is moved horizontally in the width direction of the metal strip 1 (the direction perpendicular to the transport direction of the metal strip 1), the rotation shaft 41 with a screw is rotated by the rotation of the width direction position adjusting handle 40, and this screw is attached. The moving body 43 is moved in the axial direction of the threaded rotating shaft 41 by the rotation of the rotating shaft 41. Each magnet 4 is preferably arranged between the lower side of the side end portions 3 and 3 of the metal band 1 and the outer side (side) than the side end surface of the metal band 1. Even if some meandering (walking) occurs in the conveyance of the band 1, the side end portion 3 of the metal band 1 is difficult to be removed from the range of attraction of the magnet 4. The protruding length of the magnet 4 from the side end face of the metal band 1 is preferably 30 mm or more. In addition, it is preferable that the protrusion length from the side end surface of the metal strip 1 of the magnet 4 is 50 mm or less.

  Further, the height positions of the magnets 4 and 4 differ depending on how much the attractive force is exerted on the side end portion 3 of the metal strip 1. That is, when the unevenness of the undulation (referred to as “ear extension”) generated at the side end 3 of the metal band 1 is large, the attractive force by the magnet 4 is increased and the back end coating of the side end 3 of the metal band 1 is performed. In order to increase the contact force to the applicator roll 13, the magnet 4 is brought close to the side end 3 of the metal strip 1, and when the unevenness difference is small, there is no need to increase the attractive force by the magnet 4, Since it is not necessary to increase the contact force of the side end portion 3 of the metal band 1 to the applicator roll 13 for back surface coating, it is not necessary to bring the magnet 4 close to the side end portion 3 of the metal band 1. The height position of the magnet 4 varies depending on the thickness and width dimension of the metal band 1 and the magnetic force of the magnet 4, but the dimension between the upper surface of the magnet 4 and the side end face of the metal band 1 is 5 to 30 mm. preferable.

In the present invention, magnets 4, 4 are arranged below one side end 3 and below the other side end 3 of the metal band 1, and the upper side of the one magnet 4 and the other magnet 4 (the metal band 1 The side poles 3 and 3 of the metal band 1 are attracted so as to be displaced downward, and as shown in FIG. 3, the metal band 1 side is an N pole side magnet 4. A magnetic closed circuit is formed from the metal band 1 to the magnet 4 on the S pole side through the metal band 1 to strengthen the magnetic force. That is, the magnetic field lines M are formed so as to go from the N pole to the S pole through the metal band 1. Further, by causing the magnet 4 to protrude laterally from the side end face of the metal band 1 (overhang), the attractive force with respect to the side end face (edge) of the metal band 1 can be increased. Can be prevented from being removed from the side end portion 3 of the metal strip 1 even if the coil meanders somewhat. In the present invention, even if there is undulation (ear extension) at the side end 3 of the metal strip 1, the lower surface of the side end 3 of the metal strip 1 is applied to the lower surface of the applicator roll 13 by the attractive force of the magnet 4. It becomes easy to make it contact with the surrounding surface of this, and it becomes difficult to produce an unpainted part in the side edge part 3 of the metal strip 1.

  When a coating experiment was performed on the metal strip 1, which is a steel strip having a width dimension of 716 mm and a thickness of 0.8 mm, using the above-described coating apparatus, an unpainted portion having a width of 1.5 mm is metal in the absence of the magnet 4. Even if it is formed on the side end 3 of the band 1, if a 4000G magnet 4 is used, the width dimension of the unpainted portion is 0 when the dimension between the magnet 4 and the side end 3 of the metal band 1 is 30 mm. When the dimension between the magnet 4 and the side end 3 of the metal strip 1 is 20 mm, the width of the unpainted portion is 0.2 mm, and the distance between the magnet 4 and the side end 3 of the metal strip 1 is When the dimension between them was 10 mm, there was no unpainted part.

It is a partial schematic diagram showing an example of an embodiment of the present invention. It is a schematic diagram same as the above. It is explanatory drawing which shows a magnetic force line same as the above. An example of a prior art is shown, (a) is a schematic diagram of the whole, and (b) is a schematic diagram of a part. It is the schematic which shows the other example of a prior art example.

Explanation of symbols

1 Metal strip 2 Roll coater 3 Side end 4 Magnet

Claims (2)

In the manufacturing method of a coated metal band, in which a roll coater is brought into contact with the lower surface of the metal band while it is being transported , the width of the metal band is determined by positioning the magnet from below the side edge of the metal band to the outside. A method for producing a coated metal strip, characterized in that painting is performed while attracting only the both end portions in the direction toward the roll coater with a magnet. 2. The method for producing a coated metal strip according to claim 1, wherein the magnet is formed so as to be movable close to and away from a side end portion of the metal strip and parallel to the lower surface of the metal strip in the width direction .

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