JP2010094679A - Roll for rolling emboss and method of manufacture copper bar and copper foil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll for rolling embosses and a method of manufacturing copper bars and copper foils for always forming a fine projecting solid pattern having desired dimensions are formed always accurately and uniformly on the surface of the copper bar and the copper foil without causing the degradation or production efficiency and manufacturing yield. <P>SOLUTION: The projecting solid pattern is formed on the copper bar of a material to be worked by using a die body belt 1 in which emboss recessed holes 15 are formed on the outer peripheral surface of a caterpillar-shaped belt and rolling oil releasing holes 3 which are extended so as to communicate with the emboss recessed holes 15, to penetrate in the thickness direction and set so that surplus rolling oil is released in their directions, a roll shaft body 2 for moving the die body belt 1 like a caterpillar by transmitting the rotational movement of the outer peripheral surface by bringing its outer peripheral surface into contact with the inner peripheral surface of the die body belt 1 and the roll 10 for rolling the embosses with which a predetermined tension is applied to the die body belt 1 together with the roll shaft body 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention requires a rolling oil during emboss rolling, for example, emboss rolling on the surface of a workpiece such as a copper strip or copper foil material to form a minute convex three-dimensional pattern. The present invention relates to an emboss rolling roll for forming, and a copper strip / copper foil manufacturing method including a step of emboss rolling on a copper strip or a copper foil using the roll.

  Copper strips and foil materials are used in a wide variety of industrial fields and industrial products, but some are used by being bonded to dissimilar members as usage forms, such as flexible printed wiring boards and various heat sinks. Not a few. In such a case, in order to improve the adhesion between the two, chemical surface treatment such as rough plating or etching, mechanical surface treatment such as blast treatment, etc., both or at least one adhesive surface In many cases, the method of deliberately roughening the bonding surface by applying to the surface is employed. Or more generally, a method of forming a rough surface by appropriately roughing the surface of a metal strip or metal foil other than a copper strip or copper foil is also often used.

One method for forming minute irregularities on the surface of such a metal foil material is a processing method called emboss rolling.
Embossing rolling is generally a three-dimensional pattern consisting of irregularities formed on the processing surface of a roll mold called an embossing rolling roll, which is the main jig and tool, on the metal foil or metal strip of the workpiece. This is a processing method for transferring by an embossing rolling process. An embossed three-dimensional pattern is formed on the surface of the embossing roll used in the process, and the embossing process is performed by attaching the embossing roll to a rolling mill.

The rolling mill used to emboss and roll a metal foil material such as copper foil is not shown in the figure, but the rolling load is in direct contact with the metal foil material to be rolled while rotating. Is provided with two work rolls arranged one above and below the metal foil material, an intermediate roll and a backup roll for backing up each work roll, and the like. For example, forged steel rolls are generally used as the various rolls (Patent Documents 1 and 2).
In addition, there are various types of rolling mills such as 4-high rolling mill, 6-high rolling mill, 12-high rolling mill, and 20-high rolling mill, depending on the diameter of the work roll and the number of intermediate rolls and backup rolls. The one suitable for the specific application and specification is selected.
In such an emboss rolling process, as in the case of flat rolling, it is necessary to cool a roll mold and a metal foil material that are heated due to heat generated inevitably when performing the process, and a roll mold. Rolling oil is generally used because of the necessity of smooth release of the metal foil material from the mold and the necessity of washing away foreign matters, etc. (Patent Document 3).

  The chemical surface treatment methods such as rough plating and etching described above, or mechanical surface treatment methods such as blast treatment tend to take a long time and the required roughness is large. However, the processing time becomes longer and the process management becomes more complicated, resulting in a deterioration in productivity. In addition, since the blasting process cannot obtain a roughness different from the size of the abrasive grains, there are many restrictions on the degree of freedom in setting the roughness. Therefore, from the viewpoint of such industrial productivity, the embossing rolling process that requires a very short processing time and can dramatically increase the productivity is a processing method with extremely advantageous characteristics. There is a great expectation.

JP 2001-179212 A Japanese Patent Laid-Open No. 04-66208 JP 2006-281249 A

  However, when a fine embossed pattern is formed on the surface of a copper foil material or a copper strip by the conventional embossing rolling process as described above, the rolling load and roll mold specifications are appropriate. In spite of this, there has been a problem that remarkable defects and defects often occur in various dimensions and shapes including the height of the formed embossed pattern.

Such formation failure of the emboss pattern is often caused by the fact that the surplus of rolling oil supplied by the pouring method during embossing fills the embossed concave hole of the roll mold. We confirmed this through various experiments and analysis and consideration of the cause of emboss pattern defects in actual production lines. In other words, the rolling oil is already filled in the concave hole of the roll mold even when embossing is performed by applying an appropriate load using a roll mold while pouring an amount of rolling oil considered to be an appropriate amount. If it does, it will be obstructed that the work piece plastically deforms and enters into the concave hole. As a result, defects and defects occur in various dimensions and shapes including the height of the embossed pattern.
According to this knowledge, it can be considered that the problem of poor emboss pattern formation as described above can be overcome by avoiding excessive application of rolling oil. However, for example, when an extremely fine protrusion-like emboss pattern having a height of 100 μm or less is formed on the surface of a copper foil material or a copper strip material, an extremely small amount of error in the amount of rolling oil applied or applied Even if non-uniformity only occurs, the rolling oil fills in, for example, a concave hole in a local region in the roll mold, and the formation of an emboss pattern as described above still occurs in that region. It will be. Moreover, in order to prevent such minute errors and non-uniformity from occurring, it is necessary to control and manage the amount and amount of rolling oil flowed very strictly, which is extremely difficult in practice. Or it is virtually impossible.

On the other hand, it is possible to stop the pouring of the rolling oil, but this causes another problem.
That is, the rolling oil generally has a role as a lubricating oil and a cooling oil. The roll mold performs plastic working while applying a large load to a copper strip or other metal plate material which is a workpiece while rotating at high speed. For this reason, the roll mold becomes high temperature in the rolling process. And when it becomes high temperature, thermal expansion called thermal crown tends to occur. For this reason, when the rolling oil is not poured, the cooling effect by the rolling oil cannot be expected, so it is necessary to prevent the roll mold and the workpiece from becoming high temperature. For this purpose, the rolling speed must be reduced. Accordingly, the production efficiency is lowered.
In addition, the rolling oil (especially the flowing rolling oil) also has a role of washing away foreign substances entering from the outside. In general, foreign matters are likely to be mixed during rolling, but if such foreign matters cannot be washed away and removed, there is a very high possibility that a dent caused by foreign matters called roll marks or foreign matter indentation will occur on the workpiece. Become. When a roll mark is generated, the portion where the roll mark is generated must be removed at the time of product shipment, resulting in a decrease in yield.

As described above, in the conventional technique, the occurrence of thermal crown and roll mark can be suppressed or eliminated by pouring rolling oil, but contrary to this, there is an emboss pattern formation defect or defect. There was a problem that the risk of occurrence increased.
In addition, if the rolling oil is not poured, the embossing pattern height and shape defects and defects are suppressed or eliminated, but the rolling oil application amount is insufficient or the rolling oil is applied in advance. Even so, there is a problem that the coating amount becomes non-uniform and thermal crowns and roll marks are generated, which in turn causes a reduction in production efficiency and yield.
The present invention has been made in view of such problems, and its purpose is to achieve desired dimensions on the surface of the copper strip material or copper foil material of the work piece without causing a reduction in production efficiency or production yield. It is an object of the present invention to provide a roll for emboss rolling and a method for producing a copper strip / copper foil capable of always and accurately (or reliably) forming a fine convex three-dimensional pattern.

In the emboss rolling roll of the present invention, an embossed concave hole for forming a desired convex three-dimensional pattern on the surface of the workpiece is formed on the outer peripheral surface of the infinite rail belt material, and the embossed concave hole A mold body belt formed with rolling oil relief holes formed so as to extend through the thickness direction of the belt material and allow excess rolling oil to escape in that direction, and the mold body belt An outer peripheral surface is in contact with the inner peripheral surface of the roll, and a roll shaft body for moving the mold main body belt in an endless manner by transmitting the rotational movement of the outer peripheral surface to the inner peripheral surface of the mold main body belt. And a guide roll for moving the mold body belt infinitely while supporting the mold body belt while applying a predetermined tension to the mold body belt together with the roll shaft body. Rolling The convex three-dimensional pattern is formed on the surface of the workpiece by pressing the outer peripheral surface of the mold body belt against the surface of the workpiece while rotating with the roll shaft while using It is characterized by being set.
In the copper strip / copper foil manufacturing method of the present invention, an embossed concave hole for forming a desired convex three-dimensional pattern on the surface of the workpiece is formed on the outer peripheral surface of the endless rail-shaped belt material, and A die body belt having a rolling oil relief hole formed so as to extend through the embossed concave hole and extend through the thickness direction of the belt material and to release excess rolling oil in the direction, and the die The outer peripheral surface is in contact with the inner peripheral surface of the mold main body belt, and the rotational movement of the outer peripheral surface is transmitted to the inner peripheral surface of the mold main body belt through the contact, thereby allowing the mold main body belt to move infinitely. A roll shaft body for the purpose of movement, and the mold body belt in an infinite manner while supporting the mold body belt while applying a predetermined tension to the mold body belt together with the roll shaft body. With guide rolls to exercise Using the emboss rolling roll provided, the rolling oil is poured and the outer peripheral surface of the mold main body belt is pressed against the surface of the copper material as the workpiece while rotating together with the roll shaft body. Thus, the convex three-dimensional pattern is formed on the surface of the copper material as the workpiece while discharging the excess rolling oil in the embossed concave hole from the embossed concave hole to the outside through the rolling oil relief hole. It is characterized by including the process to perform.

  According to the present invention, without causing reduction in production efficiency and production yield, while suppressing or eliminating the occurrence of thermal crown and roll mark by pouring rolling oil and applying a sufficient amount of rolling oil, It is possible to accurately and uniformly form a fine convex three-dimensional pattern having a desired size and shape on the surface of the copper strip or copper foil of the workpiece.

Hereinafter, a roll for emboss rolling according to the present embodiment and a method for producing a copper strip and a copper foil using the roll will be described with reference to the drawings.
FIG. 1 is a diagram showing a main configuration of an embossing rolling roll according to an embodiment of the present invention, and FIG. 2 is a schematic configuration of a four-high rolling mill using the embossing rolling roll shown in FIG. FIG. 3 schematically shows an embossing roll according to an embodiment of the present invention and a main embossing operation in a method for producing a rolled copper foil using the same (FIG. 3A). It is a figure typically shown compared with the case of a processing method (Drawing 3 (b)).

  As shown in FIG. 1, the emboss rolling roll 10 according to the present exemplary embodiment is configured so that the outer peripheral surface is coaxially overlapped with the mold main body belt 1 and the inner peripheral surface of the mold main body belt 1. A roll shaft body 2 for moving the mold main body belt 1 in an endless manner by transmitting the rotational movement of the outer peripheral surface to the inner peripheral surface of the mold main body belt 1 in contact with each other, and the roll shaft body 2 A guide roll 16 (17) for moving the mold main body belt 1 in an endless manner while supporting the mold main body belt 1 while applying a predetermined tension to the mold main body belt 1, and its main The part is composed.

  The die body belt 1 has an embossed concave hole 15 for forming a desired convex three-dimensional pattern 9 on the surface of a workpiece such as a copper strip or copper foil. It is formed on the outer peripheral surface of (a member formed in an infinite rail shape as a metal material before the embossed concave hole 15 or the like is formed). The embossed concave hole 15 is formed so as to penetrate in the thickness direction of the mold main body belt 1 (the belt material), that is, between the outer peripheral surface and the inner peripheral surface. A rolling oil escape hole 3 is formed so as to allow excess rolling oil 8b, 8c to escape from the space.

In the structure shown in FIG. 1, the embossed concave hole 15 and the rolling oil relief hole 3 are provided with a hole penetrating in the thickness direction of the mold body belt 1 by, for example, laser processing, so that the outer periphery of the mold body belt 1 is It is provided as a series of through-holes having the same diameter from the surface to the inner peripheral surface and continuing straight (straight).
However, it is needless to say that the embossed concave hole 15 and the rolling oil relief hole 3 are not limited to those having such an aspect. In addition to this, for example, as shown in FIG. 3A, the embossed concave hole 15 has a diameter and a cross-sectional shape of a size and a shape conforming to a desired convex three-dimensional pattern 9, and The continuous rolling oil relief holes 3 are straight through holes having such a diameter that the excess rolling oils 8b and 8c can be effectively discharged out of the embossed concave holes 15. It may be. In the example shown in FIG. 3A, the embossed concave hole 15 has a diameter larger than that of the rolling oil relief hole 3, and the three-dimensional shape of the embossed concave hole 15 is not straight, but has a desired convex shape. It is a truncated cone shape (standing section trapezoidal shape) conforming to the shape of the solid three-dimensional pattern 9.
Or although illustration is abbreviate | omitted, about the shape in planar view of the embossed concave hole 15, it is not limited only to circular, In addition, desired convex shape to form, for example, an ellipse, a rectangle, a rhombus, a polygon, etc. Of course, various pattern shapes according to the three-dimensional pattern 9 can be used.
Of course, the method of forming the embossed concave hole 15 and the rolling oil relief hole 3 is not limited to the laser processing as described above. In addition, it can be formed by, for example, mechanical cutting.

The roll shaft body 2 has a die body belt 1 coaxially overlapped on the outer periphery thereof, and an outer peripheral surface is applied to the inner peripheral surface of the mold body belt 1 while applying a predetermined tension so as not to cause slipping or idling. And the rotational movement of the outer peripheral surface is transmitted to the inner peripheral surface of the mold main body belt 1 through the contact, thereby moving the mold main body belt 1 in an endless manner.
On the outer peripheral surface of the roll shaft body 2, the excess rolling oil 8 b and 8 c in the embossed concave hole 15 is continued from the rolling oil escape hole 3 to the outside thereof in a manner continuous with the rolling oil relief hole 3 of the die body belt 1. A rolling oil relief groove 4 for escaping is formed. The rolling oil relief groove 4 is formed on the outer peripheral surface of the roll shaft body 2 by, for example, mechanical cutting or laser processing so as to extend linearly in a direction parallel to the central axis of the roll shaft body 2.
Accordingly, excess rolling oil 8b, 8c in the embossed concave hole 15 of the mold body belt 1 passes through the rolling oil escape hole 3 provided to be continuous with the embossed concave hole 15, and further into the rolled oil relief hole 3. It flows or is sucked along the axial direction of the roll for emboss rolling through the rolling oil relief groove 4 provided on the outer peripheral surface of the roll shaft body 2 so as to be continuous. It is set to be discharged to the outside of the roll 10 for rolling process.

  In the emboss rolling roll 10 according to the present embodiment, as described above, the mold main body belt 1 and the roll shaft body 2 are divided and formed so as not to cause idling or misalignment. Since the main part of one embossing roll 10 is formed by superimposing, punching or the like is performed on the die body belt 1 in a single state before being superposed on the roll shaft 2. Thus, the rolling oil relief hole 3 and the embossed concave hole 15 can be easily and accurately formed in the mold main body belt 1. Further, when the roll shaft body 2 is in a single state, the rolling oil relief groove 4 can be easily and accurately formed on the outer peripheral surface of the roll shaft body 2.

In addition, as a forming material of the roll 10 for emboss rolling processing which concerns on this Embodiment, it is possible to set it as a forged steel roll, a cemented carbide roll, or another general thing, for example. Specifically, for example, it can be made of cemented carbide, cermet, high-speed steel, die steel, forged steel and the like.
Further, the rolling oil relief groove 4 is not limited to being provided on the outer peripheral surface of the roll shaft body 2, and can also be provided on the inner peripheral surface of the mold main body belt 1.
Further, auxiliary relief grooves (not shown) that are orthogonal or oblique to the rolling oil relief grooves 4 as described above may be further provided. By doing in this way, it becomes possible to discharge | emit the excess rolling oil 8b and 8c in the embossed concave hole 15 more effectively.
It is also possible to connect a plurality of mold body belts 1 in series in the axial direction of the roll shaft body 2 so as to cope with emboss rolling on a wider workpiece. It is.

  In the copper strip / copper foil manufacturing method according to the present embodiment, a rolling mill as shown in FIG. 2 is used. This rolling mill emboss-rolls the roll 10 for emboss rolling, the work roll 12, the backup roll 13, the backup roll 14, and the guide rolls 16 and 17 on the surface of the copper strip 5 which is a workpiece. It is provided as a main part of the apparatus configuration for applying In the rolling mill shown in FIG. 2, for example, a strip-shaped (strip-shaped) copper strip 5 is set so as to be sent in the direction indicated by the arrow 6 from the left to the right in FIG.

  The embossing roll 10 is infinitely driven by mechanically driving the mold body belt 1 formed with the embossed concave hole 15 and the rolling oil relief hole 3 and the rolling oil relief groove 4 as shown in FIG. It is a work roll provided with the roll shaft body 2 and the guide rolls 16 and 17 for moving in a rail manner, and is in direct contact with the surface of the copper strip material 5 that is a work piece to apply a rolling load. By applying, an emboss pattern is set on the surface of the copper strip 5. That is, this embossing roll 10 presses the embossed concave hole 15 provided on the outer peripheral surface of the die body belt 1 as an embossing die body against the surface of the copper strip 5, and the copper in that portion. An embossing work roll for forming an embossing pattern including a convex three-dimensional pattern 9 formed by transferring the embossed concave hole 15 on the surface of the copper strip 5 by plastically deforming the strip 5 is there.

Here, the structure of the rolling mill shown in FIG. 2 is such that the embossing pattern can be formed on both the front and back surfaces of the copper strip 5 that is the workpiece by a single emboss rolling process. The emboss rolling roll 10 according to the present embodiment is disposed on both the front and back sides. However, the structure of the rolling mill is not limited to this. In addition, the emboss rolling roll 10 according to the present embodiment is disposed only on one side (for example, the upper surface in FIG. 2) of the copper-like material 5, and the die body belt 1 is disposed on the back surface of the copper strip material 5. Are superimposed or a metal belt 1 having a flat surface not having an embossed concave hole 15 is superimposed (reference numeral 1 in FIG. 2).
2 shows this case), a work roll 12 for simply mechanically supporting the embossing roll 10 and the copper strip 5 is arranged below the embossing roll 10. Also good. That is, the work roll 12 is disposed facing the embossing roll 10 with the copper strip 5 interposed therebetween, and is applied to the copper strip 5 by the embossing roll 10 from above in the example shown in FIG. By supporting the rolling load below, the emboss rolling process is performed with a predetermined rolling load on the copper strip 5 sandwiched between the work roll 12 and the embossing roll 10. However, it is possible to form an emboss pattern only on one side of the copper strip 5 using such a work roll 12.

  The guide rolls 16, 17 support the mold body belt 1 while applying a predetermined tension to the mold body belt 1 together with the roll shaft 2, while supporting the mold body belt 1 in an infinite rail manner. For exercise. As with the roll shaft body 2, the guide rolls 16 and 17 may be a dynamic shaft for transmitting a predetermined driving force to the mold main body belt 1, or a simple tension that does not contribute to the transmission of the driving force. It is good also as a free axis (slave axis) for support.

  The backup roll 13 and the backup roll 14 have so-called backup functions such as drive control and rolling load control for the emboss rolling roll 10 and the work roll 12, respectively, as in the case of a general rolling mill. Is to do.

The manufacturing method of the copper strip and copper foil which concerns on embodiment of this invention uses the above rolling mills, sprinkling rolling oil 8a, and is a copper strip material or copper foil (these are processed) Embossing is performed on one side or both sides of the copper strip material 5).
When the copper strip 5 of the workpiece is put into a rolling mill as shown in FIG. 2, the embossing rolling process according to the embodiment of the present invention is performed by the embossing rolling roll 10 equipped therein. It is applied to the copper strip 5 that is the workpiece. While the embossing rolling process by the embossing roll 10 is performed, the rolling oil 8a is continuously poured. Alternatively, in addition to that, the rolling oil 8a is applied at a stage before the copper strip 5 of the workpiece reaches the roll 10 for emboss rolling (in the region shown as region 7 in FIG. 2). .

And when the copper strip 5 which is a workpiece put into the rolling mill reaches the roll 10 for emboss rolling, in the roll 10 for emboss rolling, the roll shaft body of the outer peripheral surface of the mold body belt 1 is used. By rotating the part in contact with the outer peripheral surface of 2 together with the roll shaft body 2 while using the rolling oil 8a as a lubricating oil / cooling oil, while pressing the surface of the copper strip material 5 as a workpiece, A convex three-dimensional pattern 9 is formed on the surface of the copper strip 5.
When the rolling oil 8a is continuously poured in this emboss rolling process, generally, as shown in FIG. 3B, excess rolling oil 8c tends to remain in the space of the embossed concave hole 15 and easily collect. As a result, there was a risk of embossing rolling failure.
However, in the emboss rolling roll and the copper strip / copper foil manufacturing method using the roll according to the present embodiment, as shown in FIG. 3A, excess rolling oil 8b in the embossed concave hole 15; 8 c is discharged out of the mold main body belt 1 by the rolling oil relief hole 3 and the rolling oil relief groove 4. Here, in FIG. 3 (a), the mold main body belt 1 is drawn in a significantly curved state, but this is somewhat unnatural in order to express the portion where the emboss rolling process is performed in a simple manner. It is drawn in such an exaggerated shape, and it goes without saying that the mold body belt 1 is not actually pressed against the surface of the copper strip 5 in such a curved state.

Next, the main action in the method for producing a copper strip / copper foil according to the present embodiment will be described in comparison with and contrasted with a conventional production method.
Generally, in the embossing rolling process, the embossing rolling process is performed while pouring the rolling oil 8a for the purpose of cooling the embossing rolling roll 10, which is a main jig, or washing off foreign matter.
In the embossing rolling process, the vicinity of the surface of the copper strip 5 is plastically deformed by the rolling load into the space of the embossed concave hole 15 formed on the surface of the roll 10 for embossing rolling. A convex three-dimensional pattern 9 is formed on the surface of the material 5.

  However, if the rolling oil 8a is continuously supplied by pouring, as shown in FIG. 3B, the coated rolling oil on the surface of the copper strip 5 or on the surface of the embossing roll 10 is obtained. Excessive amount of the rolling oil 8c due to the excessive amount is filled in the space of the embossed concave hole 15 provided on the surface of the embossing roll 10. Then, even if a rolling load is applied in this state, the space in the embossed recessed hole 15 has already been blocked due to the filling of the excess rolling oil 8c. The copper strip 5 can no longer flow into the space of the embossed concave hole 15. Due to such factors, despite the appropriate specifications of rolling load and roll mold, the various dimensions and shapes including the height of the formed convex three-dimensional pattern 9 are extremely poor. And defects were frequent.

Therefore, in the copper strip / copper foil manufacturing method according to the present embodiment, as shown in FIG. 3A, the excess rolling oil 8b in the embossed concave hole 15 is removed from the rolling oil relief hole 3 and the rolling oil relief. The grooves 4 are discharged to the outside of the emboss rolling roll 10.
By doing so, the embossed concave hole is maintained throughout the embossing rolling process even if the rolling oil 8a is continuously poured for the purpose of cooling the embossing roll 10 or washing away foreign matter. Since the excess rolling oil 8b and 8c in 15 is discharged to the outside of the embossed concave hole 15 by the rolling oil relief hole 3 and the rolling oil relief groove 4, the excess rolling oil 8c fills the space of the embossed concave hole 15 It becomes possible to avoid doing. As a result, a sufficient amount of rolling oil 8a is poured without causing defects in various dimensions and shapes including the height of the convex three-dimensional pattern 9 and the occurrence of defects. The surface of the copper strip 5 of the work piece without causing a reduction in production efficiency and production yield due to the occurrence of a thermal crown, roll mark, emboss pattern shape defect, etc. that may have occurred when not flowing In addition, it is possible to always accurately and uniformly form a fine convex three-dimensional pattern 9 having a desired dimension.

Further, since the mold body belt 1 is mounted so as to be bridged between the roll shaft body 2 and the guide roll 16 (17), for example, a desired projection to be formed for each production lot. Even when it is necessary to change the shape of the three-dimensional pattern 9 of the mold, it is very easy to replace it with the mold body belt 1 having the embossed concave hole 15 corresponding to the shape of the desired convex three-dimensional pattern 9. There is also an advantage of being able to do it.
Moreover, since the die main body belt 1 has an area clearly larger than the surface area of the roll shaft body 2 or the conventional emboss rolling roll, it directly contacts the copper strip 5 to the surface thereof. The area of the region moving in the air in the room without being involved in the embossing rolling process at the left is much larger than the area of the region involved in the embossing rolling process. Therefore, the mold main body belt 1 is an emboss rolling mold having a very high natural cooling effect. In addition, for the same reason, there is also an advantage that oiling and scavenging (wiping off the remaining rolling oil remaining) on the outer peripheral surface and inner peripheral surface of the mold main body belt 1 can be easily performed.
In addition, the copper strip material 5 processed by the copper strip / copper foil manufacturing method according to the present embodiment sets the dimensions such as the diameter and depth of the embossed concave hole 15 to desired fine dimensions. By setting the distribution density or the like to a desired setting, it is possible to set the surface roughness of the work piece in a rolled finish with high accuracy, thereby greatly improving the degree of design freedom for various applications. Therefore, the method for producing a copper strip / copper foil according to the present embodiment can contribute to improvement of product characteristics of a high-performance metal material.

Using the embossing roll as described in the above embodiment, a copper strip / copper foil was produced by embossing a flat copper foil.
In this embodiment, as the mold body belt 1, a belt-shaped SUS plate having a thickness of 1 mm, a width of 100 mm, and a length of 1000 mm is formed in an infinite rail shape. And the embossed concave hole 15 and the rolling oil escape hole 3 were formed by laser processing as a series of holes penetrating the mold body belt 1 straightly in its thickness direction (thickness direction).
As shown in FIG. 4, the embossed concave hole 15 for forming the convex three-dimensional pattern 9 is an oval having an outer dimension 20 in the major axis direction of 22 μm and an outer dimension 21 in the minor axis direction of 12 μm in plan view. It was of the type.
In addition, the pitch between the adjacent embossed concave holes 15 was set such that the horizontal pitch 22 was 25 μm and the vertical pitch 23 was 20 μm.

  As the roll shaft body 2, a steel material having a diameter of 40 mm and a length of 100 mm was used. And the rolling oil escape groove | channel 4 extended linearly along the axial direction was formed in the outer peripheral surface of this roll shaft body 2 by mechanical cutting. The main specification dimensions of the rolling oil relief groove 4 were a width of 0.5 mm, a depth of 100 μm, a length of 100 mm, and a circumferential pitch of 1.5 mm.

Then, the die body belt 1 as described above is overlapped on the outer periphery of the roll shaft body 2 and is also overlapped on the outer periphery of the guide rolls 16 and 17 so that a predetermined tension is applied. It was set as the roll 10 for the emboss rolling which concerns. And the die main body belt 1 was made to move infinitely by making the roll axis | shaft body 2 function as a moving axis.
As the rolling mill, a four-high rolling mill having a structure as shown in FIG. 2 was used.
As a test material, a strip-shaped C1100 coil material having a thickness of 33 μm, a width of 40 mm, and a length of 100 m, which is a general rolled copper foil TPC material, was prepared.

The embossing rolling process according to the embodiment includes a die body belt 1 and a roll shaft body 2 formed with a rolling oil relief hole 3 and a rolling oil relief groove 4, and an embossing roll 10 having guide rolls 16 and 17. Was carried out under a load of about 17 kN / cm while applying rolling oil 8a at a flow rate of 3 L (liter) per minute. Further, at this time, in order to remove foreign matters that may be easily adhered and accumulated on the outer peripheral surface of the mold main body belt 1 or the embossed concave hole 15, rolling oils 8b and 8c that are likely to flow backward or remain. In order to further reliably cool the mold main body belt 1 by forced air cooling, a blower (not shown) was disposed in the vicinity of the guide rolls 16 and 17. Thus, the copper foil formed by embossing with the manufacturing method which concerns on the Example of this invention was produced (sample 1).
Further, for comparison with the above-described example, as the embossing rolling process of Comparative Example 1, an embossing roll 10 provided with a die body belt 1 provided with rolling oil relief holes 3 and rolling oil relief grooves 4 is used. However, the pouring of the rolling oil 8a is completely stopped, and the rolling oil presumed to be an appropriate amount as the lubricating oil and the cooling oil is applied to the surface of the copper strip 5 in advance (at a stage where it passes around the region 7 in FIG. 2). The emboss rolling process was performed under the same conditions as in the examples (Sample 2).
Further, as the embossing rolling process of Comparative Example 2, a conventional general forged steel roll (not shown) having the embossed concave hole 15 but not the rolling oil relief hole 3 and the rolling oil relief groove 4 is used. The conditions were the same as the setting in the example, and emboss rolling was performed while flowing rolling oil at a flow rate of 3 L (liter) per minute (Sample 3).
The result was as summarized in Table 1.

  In the sample 1 obtained by the embossing rolling process of the example, when the inspection / measurement using the laser microscope was performed, no roll mark or sticking or the like assumed to be caused by the inclusion of the foreign matter was generated, and Also, the height dimension of the convex three-dimensional pattern 9 was 6.3 ± 0.3 μm, and it was confirmed that the target height of 6 μm was sufficiently stood and a uniform processed surface could be realized.

  On the other hand, in the sample 2 obtained by the embossing rolling process of Comparative Example 1, roll marks due to adhesion of foreign matters were generated. This is assumed to have occurred because the rolling oil 8a was not supplied by pouring.

  Moreover, in the sample 3 obtained by the emboss rolling process of the comparative example 2, the removal of the relics and the cooling became possible by pouring the rolling oil 8a in the embossing rolling process, so that the roll mark was completely It did not occur. However, the shape of the convex three-dimensional pattern 9 assumed to be caused by the surplus rolling oil 8c filled in the space of the embossed concave hole 15 as schematically shown in FIG. Defects and unevenness in height occurred frequently, and the average height of these convex three-dimensional patterns 9 was only 0.3 μm, which was significantly lower than the target height of 6 μm.

  From such a result, according to the embossing rolling roll and the copper strip / copper foil manufacturing method using the embossing rolling roll according to the embodiment of the present invention, a thermal crown or roll is obtained by pouring the rolling oil 8a. The generation of the mark can be suppressed or eliminated, and a fine convex three-dimensional pattern 9 having a desired dimension can be accurately and uniformly (or reliably) formed on the surface of the copper strip 5 as a workpiece. It was confirmed that this would be possible.

In the above-described embodiments and examples, the case where the workpiece is a copper strip has been described. However, for example, an ultrathin copper foil, an ultrathin material of other types of metal, or plasticity is used. Of course, the embossing roll according to the present invention and the copper strip / copper foil manufacturing method including the embossing rolling process using the roll can be applied to a non-metallic material made of the above material. .
It goes without saying that various variations are possible for the shape of the convex three-dimensional pattern 9.
In addition, if the embossing roll according to the present invention and the copper strip / copper foil manufacturing method using the roll are for embossing as described above, the structure of the rolling mill and the material of the work roll Needless to say, there are no restrictions on various specifications such as the type of rolling oil.
Further, the rolling oil relief groove 4 can be formed, for example, in a spiral shape in an oblique direction with respect to the central axis of the roll shaft 2.
Further, it is possible to omit the rolling oil relief groove 4 and use only the rolling oil relief hole 3. However, in that case, as the emboss rolling process is continued for a long time, surplus rolling oil 8b remains in the rolling oil relief hole 3 and accumulates, and finally, the embossed concave hole 15 also undergoes excessive rolling. It is also assumed that the oil 8c will be filled. In such a case, for example, a saddle-shaped jig tool (not shown) such as a blade or a squeegee is arranged in the region 11 or the region 7 of the mold body belt 1 and embossed. It is effective to wipe off excess rolling oil 8b, 8c remaining on the surface of the mold body belt 1 immediately after the formation and before re-entering the next embossing process.

In addition, the mold body belt 1 and the roll shaft body 2 are formed as separate members and move separately from each other while having mechanical contact. There is also a concern that the position of the oil escape groove 4 may shift. Therefore, in such a case, for example, both the left and right edges in the width direction of the mold main body belt 1 are provided with sprocket holes (not shown) along the edges thereof, and both the left and right ends in the axial direction of the roll shaft body 2 are provided. In order to avoid the occurrence of misalignment between the rolling oil relief hole 3 and the rolling oil relief groove 4 as described above, a sprocket (not shown) adapted to the sprocket hole of the mold body belt 1 is arranged. You can do it. Alternatively, by making the width dimension of the rolling oil relief groove 4 larger than the outer dimension of the rolling oil relief hole 3 by several times or more, the rolling oil relief hole can be produced even if a slight positional deviation occurs. It is also effective to prevent the flow of excess rolling oil 8b or the like from 3 to the rolling oil escape groove 4 from being hindered.
Moreover, the application of the roll for emboss rolling according to the present invention is not limited to the case where the emboss rolling is performed while pouring the rolling oil 8a as described in the above embodiments and examples. In addition, for example, a large amount of rolling oil 8a that does not run out of rolling oil 8a even when emboss rolling is performed from the beginning to the end of a series of copper strips 5 is applied to the mold body belt 1 or the like. The present invention can also be applied to a case where emboss rolling is performed on the copper strip 5 after it has been applied to the surface of the copper strip 5 in advance.
In addition, the copper strips and copper foils manufactured by the present invention have surface roughness corresponding to various applications such as for FPC (flexible printed wiring board), heat sinks, and current collectors for various secondary batteries. It can have.

It is a figure which shows the main structures of the roll for emboss rolling processing which concerns on embodiment of this invention. It is a figure which shows typically the outline | summary structure of the 4-high rolling mill using the roll for embossing rolling shown in FIG. In the case of the conventional embossing method (FIG. 3 (b)), the main action (FIG. 3 (a)) in the embossing rolling roll and the rolled copper foil manufacturing method using the roll according to the embodiment of the present invention FIG. It is a figure which shows typically the shape in planar view and the pitch between adjoining of the embossed concave hole 15 formed in the roll 10 for embossing rolling used for the manufacturing method which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold body belt 2 Roll shaft body 3 Rolling oil relief hole 4 Rolling oil relief groove 5 Copper strip material 8 Rolling oil 9 Convex solid pattern 10 Emboss rolling roll 15 Emboss concave hole 16 Guide roll

Claims (8)

An embossed concave hole for forming a desired convex three-dimensional pattern on the surface of the workpiece is formed on the outer peripheral surface of the endless rail-shaped belt material, and is connected to the embossed concave hole in the thickness direction of the belt material. A mold body belt formed with rolling oil relief holes set to extend to penetrate and escape excess rolling oil in the direction;
The outer peripheral surface comes into contact with the inner peripheral surface of the mold main body belt, and the rotational movement of the outer peripheral surface is transmitted to the inner peripheral surface of the mold main body belt, so that the mold main body belt moves in an infinite manner. A roll shaft for
A guide roll for moving the mold body belt infinitely while supporting the mold body belt while applying a predetermined tension to the mold body belt together with the roll shaft body; The convex three-dimensional pattern is formed on the surface of the workpiece by pressing the outer peripheral surface of the mold body belt against the surface of the workpiece while rotating with the roll shaft while using rolling oil. An emboss rolling roll characterized by being set as described above. In the embossing roll according to claim 1,
A rolling oil relief groove is provided on the outer peripheral surface of the roll shaft body so as to allow the excess rolling oil to escape from the rolling oil relief hole to the outside of the rolling oil relief hole of the die body belt. Roll for emboss rolling. In the embossing roll according to claim 1,
A rolling oil relief groove is provided on the inner peripheral surface of the mold body belt to allow the excess rolling oil to escape from the rolling oil relief hole to the outside thereof in connection with the rolling oil relief hole of the mold body belt. A roll for emboss rolling characterized by In the roll for embossing rolling processing according to claim 2 or 3,
Embossing characterized in that the rolling oil relief groove is formed so as to extend linearly in a direction parallel to the width direction of the mold body belt or in a direction parallel to the central axis of the roll shaft body. Roll for rolling process. In the roll for embossing rolling processing according to any one of claims 2 to 4,
An embossing rolling roll, further comprising auxiliary relief grooves provided so as to be orthogonal or oblique to the rolling oil relief grooves. In the roll for embossing rolling processing according to any one of claims 1 to 5,
The embossed concave hole and the rolling oil relief hole are formed by laser processing a hole penetrating in the thickness direction of the mold main body belt from the outer peripheral surface to the inner peripheral surface of the mold main body belt. A roll for emboss rolling, which is provided as a series of through-holes penetrating with the same diameter. An embossed concave hole for forming a desired convex three-dimensional pattern on the surface of the workpiece is formed on the outer peripheral surface of the endless rail-shaped belt material, and is connected to the embossed concave hole in the thickness direction of the belt material. The outer peripheral surface is in contact with the inner peripheral surface of the mold main body belt and the inner peripheral surface of the mold main body belt, which is formed so as to extend so as to pass through and the rolling oil escape holes are set so as to allow excess rolling oil to escape in that direction. Then, by transmitting the rotational movement of the outer peripheral surface to the inner peripheral surface of the mold main body belt, a roll shaft body for moving the mold main body belt in an infinite rail, and the roll shaft body together with the mold Using an embossing roll having a guide roll for moving the mold body belt in an endless manner while supporting the mold body belt while applying a predetermined tension to the mold body belt The pressure Excess rolling oil in the embossed concave hole by pressing the outer peripheral surface of the mold body belt against the surface of the copper material that is the work piece while rotating the outer peripheral surface of the mold main body belt together with the roll shaft while using oil. Including a step of forming the convex three-dimensional pattern on the surface of the copper material as the workpiece while discharging from the embossed concave hole to the outside by the rolling oil relief hole. A method for producing copper foil. In the manufacturing method of the copper strip and copper foil according to claim 7,
The excess rolling oil is further released from the rolling oil escape hole to the outside through the rolling oil escape hole of the mold body belt on the outer peripheral surface of the roll shaft body or the inner peripheral surface of the mold body belt. A rolling strip is provided with a rolling oil relief groove, and excess rolling oil in the embossed concave hole is discharged from the embossed concave hole to the outside by the rolling oil relief hole and the rolling oil relief groove. -Manufacturing method of copper foil.

Images