JP4847706B2 - Transfer method to metal plate surface - Google Patents

Description

  The present invention relates to a method for transferring a surface of a metal plate that uses a bending process to form a fine uneven pattern on the surface of the metal plate.

For example, Patent Document 1 discloses a method for forming a concavo-convex shape on the surface of a transfer roll in order to transfer a concavo-convex pattern (pattern) to the surface of a metal plate for the purpose of improving decorativeness and paint sharpness. Disclosed is a method for manufacturing a decorative metal plate that uses a microlithography method to form two or more identical patterns or different types of patterns on the surface of a rolling roll, and transfers a pattern having excellent decorative properties to the surface of the metal plate by rolling. Has been. Further, in Patent Document 2, rolling is performed by forming a concavo-convex pattern on the surface of a rolling roll by a microfabrication method such as a lithography method, and then grinding the undulations by polishing the convex portions on the surface. A roll surface processing method is disclosed. Furthermore, in Patent Document 3, a microscopic rectangular convex portion having a side length of 50 to 500 μm, which is arranged in a staggered arrangement in the rolling direction and in a roll axis direction, and a mesh-shaped concave portion surrounding the surface are provided on the surface. A method of imparting excellent workability with good paint sharpness and good lubricating oil retention to a cold-rolled steel sheet using a rolling roll formed by laser processing and subsequent etching treatment is disclosed.
JP-A-5-177207 JP-A-5-69014 Japanese Patent Laid-Open No. 7-9015

  However, with the lithography method disclosed in Patent Documents 1 and 2, it is possible to form a very precise concavo-convex pattern, but it takes a lot of time to perform lithography processing on the roll surface, and the roll processing cost is high. Become very expensive. In addition, in the method disclosed in Patent Documents 1 to 3, by using a transfer roll having a fine uneven shape on the surface, a uneven pattern is formed on the surface of the metal plate by rolling such as skin pass rolling. Even when processed and applied with high accuracy, a large pressure is applied to the micro-concave shape during transfer rolling, which causes wear and chipping of the uneven portion, and clogging of the recessed portion due to the rolling powder. As a result, there is a problem that the durability of the transfer roll, that is, the roll life is reduced. For this reason, measures such as improving the shape of minute irregularities and applying hard plating to the surface layer of the roll have been taken, but not enough roll life has been achieved, and roll repolishing must be repeated, Roll processing cost was high. Further, in the transfer by skin pass rolling, the metal plate of the material to be transferred extends in the rolling direction within the roll bite. Therefore, as schematically shown in FIG. 9 about the cross section in the rolling direction, the metal plate 1a is formed by the convex shape of the roll surface. The transferred concave shape 19 is not accurately transferred due to the relative slip between the roll and the metal plate 1a generated during rolling, and there is a problem in the dimensional accuracy of the transferred shape, that is, the transfer accuracy.

  Therefore, the object of the present invention is to reduce the load stress on the transfer tool when transferring the uneven shape to the surface of the metal plate of the transfer material using the transfer tool, making the surface uneven shape difficult to damage, And it is providing the transfer method to the metal plate surface which improves a transfer precision.

  In order to solve the above problems, the present invention employs the following configuration.

The transfer method to the metal plate surface according to claim 1 is a transfer method to the metal plate surface that forms fine irregularities on the surface of the metal plate using a transfer tool, and the transfer tool has fine irregularities on the surface. The transfer roll is provided so as to face the bending roll having no fine unevenness on the surface with the metal plate interposed therebetween, forming a transfer unit, and the bending roll The fine irregularities are formed on the one side surface of the metal plate by pressing the transfer roll against the one-side bent surface of the metal plate formed by the above.

In this way, the transfer roll can be easily pressed against the bending surface of the surface of the metal plate, and fine irregularities are continuously transferred to the surface of the metal plate with a small processing force, that is, transfer pressure. It becomes possible.
In addition, the stress state of the bending surface of the metal plate is a yield stress state, and the metal plate is easy due to the low compressive stress from the transfer tool, for example, about 1/10 to 1/100 of normal rolling. Therefore, it is possible to transfer to a metal surface with fine irregularities with a low transfer pressure. Therefore, the load stress on the transfer tool becomes slight, and the wear on the surface of the transfer tool on which fine irregularities are formed by a processing method such as photolithography hardly causes a problem even if the transfer amount increases. In addition, since the plastic deformation area due to bending is localized on the surface of the metal plate, there is little plastic deformation of the entire metal plate, the transfer accuracy of fine irregularities formed on the transfer tool is good, and the tool life is also long. improves.

The transfer method to the metal plate surface according to claim 2 is a transfer method to the metal plate surface in which fine irregularities are formed on the surface of the metal plate using a transfer tool, and the transfer tool has fine irregularities on the surface. The transfer roll is provided so as to be opposed to the bending roll on the surface of which the fine unevenness is not provided with the metal plate sandwiched therebetween, thereby forming the transfer unit. both sides provided support roll each, said bending one bending the pressing the transfer roll machining surface one surface of the metal plate of the metal plate which is formed by pressing the metal plate by the roll between the supporting rolls The fine irregularities are formed.

In this way, the bending radius of the metal plate can be easily changed by adjusting the pushing amount of the bending roll. Therefore, by optimizing the pushing amount, the metal plate having a desired thickness can be obtained. It is possible to transfer a fine uneven shape by the transfer roll after passing through the plate. It is also possible to incorporate this transfer unit into a normal roll leveler.
In addition, the stress state of the bending surface of the metal plate is a yield stress state, and the metal plate is easy due to the low compressive stress from the transfer tool, for example, about 1/10 to 1/100 of normal rolling. Therefore, it is possible to transfer to a metal surface with fine irregularities with a low transfer pressure. Therefore, the load stress on the transfer tool becomes slight, and the wear on the surface of the transfer tool on which fine irregularities are formed by a processing method such as photolithography hardly causes a problem even if the transfer amount increases. In addition, since the plastic deformation area due to bending is localized on the surface of the metal plate, there is little plastic deformation of the entire metal plate, the transfer accuracy of fine irregularities formed on the transfer tool is good, and the tool life is also long. improves.

The transfer method to the metal plate surface according to claim 3 is a transfer method to the metal plate surface in which fine irregularities are formed on the surface of the metal plate using a transfer tool, and the transfer tool has a transfer shape on the surface. a transfer hoop member a metal plate having high hardness and formed into a loop shape obtained by processing consists of three feed rolls arranged on the inner circumferential side of the transfer hoop, one of the three feed rolls was a transfer roll, the transfer roll, across the metal plate, the surface is provided so as to face the bending roll the fine irregularities is not subjected to form a transcription unit, formed by said bending rolls The fine irregularities are formed on one surface of the metal plate by pressing the transfer roll against the one-side bent surface of the metal plate.

Thus, by using a loop-shaped transfer hoop member for the transfer tool, it is possible to form a transfer shape with a long cycle formed on the transfer hoop on the metal plate without increasing the diameter of the transfer roll. Become.
In addition, the stress state of the bending surface of the metal plate is a yield stress state, and the metal plate is easy due to the low compressive stress from the transfer tool, for example, about 1/10 to 1/100 of normal rolling. Therefore, it is possible to transfer to a metal surface with fine irregularities with a low transfer pressure. Therefore, the load stress on the transfer tool becomes slight, and the wear on the surface of the transfer tool on which fine irregularities are formed by a processing method such as photolithography hardly causes a problem even if the transfer amount increases. In addition, since the plastic deformation area due to bending is localized on the surface of the metal plate, there is little plastic deformation of the entire metal plate, the transfer accuracy of fine irregularities formed on the transfer tool is good, and the tool life is also long. improves.

Transfer method to the metal sheet surface according to claim 4, the transfer roller, characterized in that the pressed against the side bending surface of the metal plate with unbending course of machining process by the bending rolls.

In this way, by pressing the transfer roll against the metal plate in the bending back step, the shape of the transferred fine unevenness does not change, so that a good dimensional accuracy of the transfer shape can be maintained.

In the transfer method to the metal plate surface according to claim 5 , the transfer unit is moved along the plate passing direction of the metal plate so that the transfer roll presses the front surface side and the back surface side of the metal plate. It is characterized in that the base arrangement is made to form a pair of transfer units.

  If it does in this way, it becomes possible to transcribe | transfer a fine uneven | corrugated pattern on both the front and back of a metal plate.

In the transfer method to the metal plate surface according to claim 6 , at least two pairs of the pair of transfer units are arranged along the sheet passing direction of the metal plate, and the fine rolls having different shapes are arranged on the transfer rolls of the pair of transfer units. The present invention is characterized in that an uneven surface is formed and a composite pattern of these fine unevenness is formed on the surface of the metal plate.

  In this way, for example, a concave shape having a large size is formed on the transfer roll of the pair of transfer units on the front stage side, and transferred to the metal plate by the transfer roll of the pair of transfer stages on the rear stage side. An uneven shape capable of fine surface processing can be formed on the convex shape having a large dimension. As a result, it is possible to form a composite pattern on a metal plate, which is a combination of a large concave shape with a low processing cost for the transfer roll and a fine uneven shape with a high processing cost. High surface transfer can be realized. Also, the roll processing cost is cheaper than when the two convex shapes are formed on one transfer roll.

Transfer method to the metal sheet surface according to claim 7, the back of the front Symbol bending rolls, provided with pressing means divided into the roll axial direction, this pressing means, between the bending roll and the transfer roll transfer pressure is characterized in that set to be uniform in the roll axial direction.

In surface transfer using a transfer roll, in order to make the transfer shape uniform, it is necessary to make the surface pressure uniform in the contact width direction between the bending roll and the transfer roll and the metal plate. For example, by disposing a pressing means such as a backup roll in the roll axis direction, the amount of pressing of each divided backup roll with respect to the bending roll, that is, a pressing force is changed, so that the surface in the contact width direction is changed. It becomes possible to transfer with uniform pressure .

  In this invention, since the transfer to the metal plate surface of the fine irregular shape formed on the transfer tool is performed by pressing the transfer tool against the bending surface of this metal plate, the yield stress state by bending Since the plastic deformation zone is localized in the surface layer portion of the metal plate, precise transfer onto the metal surface with fine irregularities can be performed at a lower transfer pressure than in the case of transfer rolling. In addition, since the transfer pressure is low, the load stress on the transfer tool is reduced, the wear of the transfer tool surface with fine irregularities is not observed, the tool life is improved, and transfer rolling is performed in terms of tool life. Thus, it is possible to form a fine uneven pattern on the surface of a large-area metal plate at a low cost.

  Further, since the transfer tool can be continuously pressed against the bending surface of the metal plate to perform the transfer, the formed transfer surface has a regular concavo-convex pattern with a constant pitch and an excellent decorative appearance. . And since the surface area has increased by the transferred uneven | corrugated pattern, it also becomes possible to use as a material excellent in heat dissipation. In addition to these, the uneven pattern transferred to the metal plate has a uniform pitch and depth, so compared to a normal rolled material where the unevenness of the surface is random and the depth of the recess is on the order of submicron, The adhesion with the coating film resin (paint) due to the anchoring effect is improved and the paint sharpness is excellent.

  Embodiments of the present invention will be described below with reference to the accompanying FIGS.

  FIG. 1 shows a roll arrangement of transfer lines used in the transfer method to the metal plate surface of the embodiment. Bending rolls 2 and 2a are arranged on the back side and the front side of the metal plate 1 along the sheet passing direction indicated by the arrow A, and the metal plate 1 is sandwiched so as to face the bending rolls 2 and 2a. By a processing method such as photolithography, transfer rolls 3 and 3a having fine irregularities formed on the roll surface are arranged to form transfer units U1 and U2, respectively. By these two transfer units U1 and U2, a metal A pair of transfer units are formed on the front and back surfaces of the plate 1 to transfer fine irregularities. And the support rolls 4 and 4a of the metal plate 1 are arrange | positioned at the entrance side and exit side of this pair of transfer unit. As shown in FIG. 1, the transfer rolls 3 and 3a are pressed against the bending surface of the metal plate 1 in the bending back process in the bending process by the bending rolls 2 and 2a. Fine irregularities formed on the front surface are continuously transferred to the front and back surfaces of the metal plate 1, respectively.

  As an example, the transfer rolls 3 and 3a have a roll diameter of φ150 mm, and on the surface thereof, fine grooves continuous in the roll circumferential direction with a width of 1 μm and a depth of 1 μm have a roll width at equal intervals of 1 μm. It is formed in the direction. The metal plate 1 is a bright finish plate made of pure aluminum having a thickness of 0.3 mm. The metal plate 1 is a bending deformation that is received by the bending rolls 2 and 2a, and the surface layer portion is in a yield stress state. Therefore, by pressing the transfer rolls 3 and 3a with a small pressure, that is, with a small compressive stress, It is easily deformed, the fine grooves are transferred to the metal plate 1, and fine uneven patterns are formed on the front and back surfaces. The plastic deformation region by bending with the bending rolls 2 and 2a is localized in the surface layer portion of the metal plate 1, and the plastic deformation of the entire metal plate 1 is very small, so the transfer accuracy of the fine grooves is good. . Further, in this transfer, since the pressing pressure of the transfer rolls 3 and 3a can be small, wear of the transfer rolls 3 and 3a is hardly recognized even when the transfer amount is increased. The roll arrangement shown in FIG. 1 is an arrangement example optimized for a relatively thin plate thickness of about 0.3 mm. It is also possible to press the bending surface against the transfer rolls 3 and 3a to form the fine uneven pattern. When the fine uneven pattern (transfer pattern) is formed only on one surface of the metal plate, either the transfer unit U1 or U2 may be provided between the support rolls 4 and 4a.

  FIG. 2 shows a roll array of transfer lines used in another embodiment. Transfer units U1 and U2 are formed on the front side and the back side of the metal plate 1 so as to face the bending rolls 2 and 2a, respectively, with the metal plate interposed therebetween, thereby forming the transfer units U1 and U2. A pair of support rolls 4, 4a, and 4b, 4c are disposed on both sides of U2 and U2, respectively. In each of the transfer units U1 and U2, the transfer rolls 3 and 3a are pressed against the bending process surfaces formed by pressing the metal plate 1 between the support rolls by the bending rolls 2 and 2a. Fine irregularities formed on the front surface are transferred to the front and back surfaces of the metal plate 1. Also in this case, since the transfer rolls 3 and 3a are pressed against the metal plate 1 whose surface layer is in a yield stress state in the respective transfer units U1 and U2, as in the case shown in FIG. Pressure), fine irregularities are transferred to the surface of the metal plate 1, and the transfer accuracy is also good. Further, it is advantageous from the viewpoint of preventing wear of the transfer rolls 3 and 3a. Furthermore, the condition that the surface layer portion of the metal plate 1 is in a yield stress state, that is, the condition for plastic deformation depends on the bending radius, the plate thickness of the metal plate 1 and the Young's modulus, and changes the indentation amount S of the bending rolls 2 and 2a. Since the bending radius of the metal plate 1 can be easily changed, the metal plate 1 having a desired thickness is made to pass through by optimizing the push-in amount S, and a fine uneven pattern is formed on the surface thereof. Can be formed. For example, when the metal plate 1 is pure aluminum (Young's modulus E = 70000MPa, yield stress σy = 100MPa), the plate thickness is about 0.2mm or more when the indentation S is adjusted and the bending radius is 75mm. As described above, a fine uneven pattern can be easily formed on the surface of the metal plate. By further reducing the bending radius, it can be transferred to a metal plate having a thickness of 0.2 mm or less. Further, in order to bend the metal plate stably by the bending roll during continuous sheeting in an actual machine, the upper limit of the thickness of the metal plate is preferably about 10 mm. It is also possible to press the bending surface against the transfer rolls 3 and 3a to form the fine uneven pattern. Further, when the fine uneven pattern is transferred only to one surface of the metal plate 1, only one of the transfer units U1 or U2 needs to be provided on the transfer line. The transfer units U1 and U2 can be incorporated into a normal roll leveler.

  The diameter of the transfer roll is determined by a transfer pattern formed on the surface of the metal plate. When the transfer pattern is a uniform pattern, a small-diameter roll with a low roll processing cost is adopted, and when the transfer pattern cycle is long, a roll diameter corresponding to the length of one cycle of the transfer pattern is required. However, when a transfer pattern having a very long cycle is required, it is necessary to make the diameter of the transfer roll very large in order to form such a long transfer shape on the transfer roll. Such a large-diameter transfer roll is difficult to manufacture, and even if it can be manufactured, the roll processing cost is very high. 3A to 3C show a transfer method in such a case. First, as shown in FIG. 3A, a transfer shape (transfer original shape) schematically shown by an arrow B on the surface of a high-hardness metal plate material (precision punched plate) 5 by etching such as photolithography. ). Next, as shown in FIG. 3B, the metal plate 5 is bent into a cylindrical shape, and both ends E and E are joined to form a loop-shaped transfer hoop member 6. Then, as shown in FIG. 3C, the transfer hoop member 6 is stretched over three feeding rolls 7a, 7b, 7c to form a transfer tool 8, and one of the feeding rolls 7a to 7c. Two rolls, for example, a feed roll 7a as a transfer roll, are opposed to the bending roll 2, and are arranged so as to be pressed against the bending surface of the metal plate 1 in the form of a belt in the bending back process of the bending roll 2. A transfer unit including the bending roll 2 and the transfer tool 8 can be formed. In this way, it is possible to form a transfer shape with a long period formed on the transfer hoop member 6 on the metal plate 1 without increasing the diameter of the transfer roll. By placing the bending roll 2 and the transfer hoop member 6 in the plate passing direction of the metal plate 1 on the side opposite to the position shown in FIG. It is possible to form a transfer shape with a long period on both the front surface side and the back surface side of 1.

  4 shows a transfer line in which a plurality of, for example, two, pairs of the transfer units U1 and U2 shown in FIG. 1 are arranged along the sheet passing direction A of the metal plate 1. As shown in FIG. As shown in FIG. 5A, a concave shape 9 capable of transferring a convex shape having a large size is formed on the transfer surface of the transfer rolls 3 and 3a. As shown in b), the fine grooves 10 are formed at intervals equal to the groove width. When the transfer rolls 3, 3a, 3b, and 3c are arranged in this manner, a large-sized convex shape 9a is transferred to the metal plate 1 by the transfer rolls 3 and 3a by the pair of transfer units U1 and U2 on the front stage side ( 5C), a fine uneven groove shape 10 is formed on the surface of the convex shape 9a transferred by the front-stage transfer units U1 and U2 by the transfer rollers 3b and 3c by the pair of transfer units U3 and U4 on the rear-stage side. It becomes possible to transfer (see FIG. 5D). Therefore, the transfer rolls 3 and 3a processed with a large transfer shape at a low roll processing cost and the transfer rolls 3b and 3c processed with a fine transfer shape with the same processing cost are freely combined to provide a composite with a high degree of freedom in transfer shape. The pattern can be formed on both the front and back surfaces of the metal plate 1. Further, the roll processing cost is cheaper than when the two transfer shapes are formed on one transfer roll. Similarly, a plurality of pairs of transfer units U 1 and U 2 shown in FIG. 2 can be arranged along the plate passing direction A of the metal plate 1. In addition, when forming a transfer shape only on one side surface of the metal plate 1, for example, the upper surface side in the drawing, for example, the transfer unit is placed in the plate passing direction of the metal plate 1 so that the transfer roll presses only the one side surface of the metal plate. In the case where two units are arranged, only the transfer units U1 and U3 may be used.

  FIG. 6 shows that the transfer pressure between the bending rolls 2 and 2a of the transfer units U1 and U2 and the transfer rolls 3 and 3a shown in FIG. 2 is uniform in the roll axis direction, that is, the width direction of the metal plate 1 of the workpiece. The back-up roll 11a-11e is each arrange | positioned as a press means divided | segmented into the roll-axis direction on the back surface of the said bending rolls 2 and 2a. By adjusting the pressing force of the backup rolls 11a to 11e against the bending rolls 2 and 2a in the roll axis direction, the transfer pressure can be applied uniformly in the width direction of the metal plate 1, and good transfer accuracy is realized. Is done.

  FIG. 7 shows another form of pressing means for making the transfer pressure between the bending rolls 2 and 2a of the transfer units U1 and U2 and the transfer rolls 3 and 3a uniform in the roll axial direction, that is, shown in FIG. Is shown. The bending rolls 2 and 2a are shrink-fitting rolls in which the outer shell 12 is fixed to the core member 13 by shrink fitting. The outer peripheral surface of the core member 13 has a plurality of circumferentially extending along the roll axial direction. A recess 14 is provided, and a divided hydraulic chamber 15 is formed by the recess 14 and the inner peripheral surface of the outer shell portion 12. Then, hydraulic oil supply grooves 16 are respectively provided so as to reach the divided hydraulic chamber 15 from the end surface of the core member 13, and are individually adjusted along the roll axis direction on the inner peripheral surface side of the outer shell portion 12. A pressing means capable of applying an internal pressure that can be formed is formed. In this way, by adjusting the internal pressure to be applied along the roll axis direction, the transfer pressure can be applied uniformly in the width direction of the metal plate 1, and good transfer accuracy can be obtained.

  FIG. 8 shows the transfer pressure between the bending rolls 2, 2 a of the transfer units U 1, U 2 and the transfer rolls 3, 3 a shown in FIG. 2 in the roll axis direction, that is, in the width direction of the metal plate 1. Instead of the pressing means, a partial heating heater 17 is disposed in the vicinity of the back surface of the bending rolls 2 and 2a along the roll axis direction. By controlling the profile of the bending rolls 2 and 2a with this partial heating heater 17, the transfer pressure can be applied uniformly to the metal plate 1, and good transfer accuracy can be obtained.

  The pressing means shown in FIGS. 6 to 8 can also be applied to the respective bending rolls of the embodiments shown in FIGS.

It is explanatory drawing which shows the roll arrangement | sequence of the transfer line used with the transfer method of embodiment. It is explanatory drawing which shows the roll arrangement | sequence of the transfer line used with the transfer method of other embodiment. (A) It is explanatory drawing which shows typically the metal plate material of the raw material of the transfer tool used by other embodiment. (B) It is explanatory drawing which shows typically the transfer hoop member formed using the metal plate material of (a). (C) It is explanatory drawing which shows the transfer line which used the transfer hoop material of (b) for the transfer tool. It is explanatory drawing which shows an example of the transfer line which arranged the some transfer unit. (A) It is a typical explanatory drawing of the transfer shape of the big dimension formed in a transfer roll. (B) It is typical explanatory drawing of the fine transcription | transfer shape formed in a transfer roll. (C) It is a schematic explanatory drawing of the transfer shape of the big dimension formed in the metal plate. (D) It is typical explanatory drawing of the composite transcription | transfer pattern by which the fine shape was transcribe | transferred to the transcription | transfer shape of (c). It is explanatory drawing which shows the example of an apparatus for making a transfer pressure uniform (when a division | segmentation backup roll is used). Same as above (when using split shrink-fitting rolls) Same as above (when using a partial heater) It is a typical explanatory view of a deformed transfer shape due to relative sliding between a roll and a metal plate during rolling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal plate 2, 2a-2c ... Bending roll 3, 3a-3c ... Transfer roll 4, 4a-4c ... Support roll 5 ... Metal plate raw material 6 ... Transfer hoop member 7a to 7c ... feed roll 8 ... transfer tool 9 ... concave shape 9a ... transfer convex shape 10 ... fine groove shape 10a ... transfer fine groove shape 11a to 11e ... backup Roll 12 ... Outer shell 13 ... Core material 14 ... Recess 15 ... Divided hydraulic chamber 16 ... Supply groove 17 ... Partial heating heaters U1, U2, U3, U4 ...・ Transcription unit

Claims (7)

A transfer method to a metal plate surface that forms fine irregularities using a transfer tool on the surface of the metal plate, wherein the transfer tool is a transfer roll in which fine irregularities are processed on the surface. A transfer unit is formed by placing a metal plate so as to face the bending roll on which the fine unevenness is not formed on the surface, and the one side bending surface of the metal plate formed by the bending roll A transfer method to a metal plate surface, wherein a transfer roller is pressed to form the fine irregularities on one surface of the metal plate. A transfer method to a metal plate surface that forms fine irregularities using a transfer tool on the surface of the metal plate, wherein the transfer tool is a transfer roll in which fine irregularities are processed on the surface. A transfer unit is formed by providing a metal plate with the surface facing the bending roll that is not provided with fine irregularities , and a support roll is provided on each side of the transfer unit. The fine irregularities are formed on the one side surface of the metal plate by pressing the transfer roll against the one side bending surface of the metal plate formed by pushing the metal plate between the support rolls. To transfer to the surface of the metal plate. A transfer method to a metal plate surface that uses a transfer tool to form fine irregularities on the surface of the metal plate, wherein the transfer tool formed a high-hardness metal plate having a transferred shape on the surface into a loop shape. The transfer hoop member and three feeding rolls arranged on the inner peripheral side of the transfer hoop member, one of the three feeding rolls is used as a transfer roll , and the transfer roll is attached to the metal plate. The transfer unit is formed so as to face the bending roll not provided with the fine irregularities on the surface, and the transfer roll is placed on the one-side bending surface of the metal plate formed by the bending roll . A method of transferring to a metal plate surface, wherein the fine irregularities are formed on one surface of the metal plate by pressing. The metal plate surface according to any one of claims 1 to 3, wherein the transfer roll is pressed against a one-side bent surface of the metal plate in a bending back process of the bending roll. Transcription method.   Two transfer units are arranged along the plate passing direction of the metal plate so as to form a pair of transfer units so that the transfer roll presses the bent surface on the front side and the back side of the metal plate, respectively. The transfer method to the metal plate surface according to any one of claims 1 to 4, wherein the transfer method is performed.   At least two pairs of the pair of transfer units are arranged along the sheet passing direction of the metal plate, fine irregularities having different shapes are formed on the transfer rolls of the pair of transfer units, and a composite of these fine irregularities. 6. The transfer method to the metal plate surface according to claim 5, wherein a pattern is formed on the surface of the metal plate.   A pressing means divided in the roll axis direction is provided on the back surface of the bending roll, and by this pressing means, the transfer pressure between the bending roll and the transfer roll is made uniform in the roll axis direction. The transfer method to the metal plate surface in any one of Claim 1 to 6 characterized by the above-mentioned.

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