JP2009022973A - Method and apparatus for manufacturing stepped deformed cross-sectional copper bar material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a stepped deformed cross sectional copper bar material by which the flatness of a thin sheet part 9 can be secured by eliminating the occurrence of waving in the thin sheet part 9. <P>SOLUTION: In the method for manufacturing the stepped deformed cross sectional copper bar material, a portion passing through a groove part 3 in a flat V-shaped die 1 in a flat sheet copper bar material 6 is formed as a thick sheet part 10 and a portion passing through a V-shaped projection 2 in the flat V-shaped die 1 is formed in the thin sheet part 9, thereby forming the stepped deformed cross sectional copper bar material. Wherein, the surface-treatment for reducing the difference between the surface roughness in the parallel direction and the surface roughness in the orthogonal direction is applied to the surface of at least V-shaped projection 2 in the flat V-shaped die 1 with respect to the moving direction of the flat sheet copper bar material 6, so that the stepped deformed cross sectional copper bar material is formed by using this flat V-shaped die 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for a stepped irregular cross-section copper strip used for, for example, a lead frame for a semiconductor package or a tape carrier.

Conventionally, a manufacturing method for manufacturing a stepped copper strip having a deformed cross section having a different thickness in the width direction and linearly continuous in the longitudinal direction by processing this type of flat copper strip, and a manufacture used for the same In the apparatus, a process for processing a flat copper strip into a stepped shape, an annealing process, finish stepped rolling, and the like are performed as main processes.
In general, as a method of processing a flat copper strip to form a stepped irregular cross section having a thin plate portion and a thick plate portion, a method of grinding and removing a predetermined portion, a groove roll and a flat roll are alternately used. In particular, there are a method of special rolling using a flat plate-shaped V-shaped die provided with a V-shaped projection, and recently, for example, Japanese Patent No. 3520770 (Patent Document 1) and Japanese Patent No. 2756402 ( Patent Document 2) and the like have proposed a manufacturing method and apparatus by rolling using a flat plate-shaped V-shaped die, and it has become possible to manufacture a stepped irregular cross-section copper strip with high productivity.

FIG. 6 is a view showing such a conventional flat plate-like V-shaped die. This flat plate-like V-shaped die (die) 100 has V-shaped protrusions 200a and 200b that have a V-shaped divergent shape from the tip.
And the groove part 300 provided so that the substantially center part may be penetrated is formed on the base 400. FIG. Flat base surfaces 500a and 500b are provided on both sides of the V-shaped projections 200a and 200b. The flat plate-like V-shaped die 100 is generally manufactured by a manufacturing method including a step of grinding a metal block material for producing a mold.
A flat copper strip (not shown) to be processed is arranged on the surface of the flat plate-shaped V-shaped die 100 on which the V-shaped projection 200 is formed, and reciprocates on the flat copper strip. By applying a pressing force with a pressing roll (not shown) or the like, the flat copper strip is pressed into a mold. Then, after the press-pressing process, a drawing process is performed in which the flat copper strip material is moved from the V-shaped tip of the mold to the rearwardly widened end (indicated by an arrow 700 in FIG. 6). By repeating this operation for each predetermined length, the portion of the flat copper strip that has passed through the groove 300 of the flat plate-shaped V-shaped die 100 is formed as a thick plate portion. A step-shaped irregular cross-section copper strip having a step-shaped irregular cross-sectional shape that is substantially linearly continuous over the entire length in the longitudinal direction is formed by forming a portion rolled through the V-shaped protrusion 200 as a thin plate portion. The In the processing process of the stepped irregular cross-sectional shape, the flat copper strip material to be processed is rolled along the V-shaped projection 200 from the front end of the V-shape toward the rear, so that the flat copper sheet is rolled. Of the strip material, the portion that passes through the V-shaped protrusion 200 (that is, the left and right side portions of the flat copper strip) is a thin plate portion. On the other hand, in the groove portion 300 of the flat plate-shaped V-shaped die 100, the V-shaped projection 200 is not provided, and the bottom surface is a flat surface continuous with the flat base surfaces 500a and 500b. The portion of the plate-shaped copper strip that has passed through passes through the flat plate-shaped V-shaped die 100 with the rolling amount being smaller than that of the V-shaped projection 200. Therefore, this portion becomes a thick plate portion.
In this way, a stepped deformed cross-section copper strip formed by mixing a thick plate portion and a thin plate portion in the width direction is manufactured with high productivity.

Japanese Patent No. 3520770 Japanese Patent No. 2756402

However, particularly when processing the width of the thin plate portion broadly or when processing the thin plate portion further thinly, the degree of rolling of the thin plate portion must be further increased. Rippling phenomenon may occur. When such a undulation phenomenon occurs, the flatness of the thin plate portion is remarkably impaired, and it may be ineligible as a product of a stepped irregular cross-section copper strip material.

In conventional technology and rolling theory, the wavy phenomenon that occurs during rolling of stepped irregular cross-section strips is the elongation in the longitudinal direction of the thick plate (also referred to as the amount of spread or material flow; the same applies hereinafter) and the length of the thin plate. It was known to occur due to the difference in direction elongation. In order to reduce such a difference in elongation, the flat plate-shaped copper strip material to be processed is widened using the flat plate-shaped V-shaped die 100 as described above, that is, in the width direction (width direction). In addition, the extension amount in each of the vertical and horizontal directions in the thin plate portion is mainly adjusted in the V-shaped opening of the V-shaped protrusion 200. The angle, the height of the V-shaped protrusion 200, the angle of the side surface (slope), and the like are changed in various ways.
However, even when such various conventional setting conditions are readjusted, the occurrence of the wavy phenomenon of the thin plate portion as described above cannot be successfully solved. That is, it cannot be said that it is clearly understood from the actual occurrence factor of the wavy phenomenon as described above.

  The present invention has been made in view of such problems, and its purpose is to eliminate the occurrence of the wavy phenomenon of the thin plate portion and to ensure the flatness of the thin plate portion, which has a stepped profile. It is providing the manufacturing method and manufacturing apparatus of a copper strip.

According to the first method of manufacturing a stepped irregular cross-section copper strip of the present invention, a V-shaped protrusion having a V-shaped diverging shape from the tip is formed on a flat base surface, and a tip of the V-shaped protrusion. Using a flat plate-like V-shaped die formed by a manufacturing process including grinding, a groove portion provided so as to pass through the substantially central portion of the V-shaped projection backward is used. After performing the press press process which presses the flat copper strip material to be processed against the surface on which the V-shaped projections of the die are formed, the flat copper strip material is removed from the mold. The portion of the flat plate-shaped copper strip material that has passed through the groove portion of the flat plate-shaped V-shaped die is formed as a thick plate portion by performing a drawing process of moving from the V-shaped tip of the plate to the rear end of the end. A portion of the flat plate-like V-shaped die that passes through the V-shaped projection is formed as a thin plate portion, and a stepped difference. A method of manufacturing a stepped irregular cross-section copper strip forming a cross-section copper strip, wherein the flat copper strip is moved relative to at least the surface of the V-shaped projection in the flat plate-shaped V-shaped die. A surface treatment is performed to reduce the difference between the surface roughness in the direction parallel to the direction and the surface roughness in the orthogonal direction, and the stepped irregular cross-section copper strip is formed using the flat plate-shaped V-shaped die. It is said.

The manufacturing method of the 2nd step-shaped irregular cross-section copper strip of this invention is the manufacturing method of the said 1st step-shaped abnormal cross-section copper strip, after giving the said surface treatment in the said flat plate-shaped V type | mold die. At least the surface of the V-shaped projection is coated with CrN, and the stepped deformed cross-section copper strip is formed using the flat plate-shaped V-shaped die.

  According to the third method for producing a stepped irregular cross-section copper strip of the present invention, in the first method for producing a stepped irregular cross-section copper strip, the surface treatment is performed, and then the flat plate-like V-shaped die is used. At least the surface of the V-shaped projection is subjected to nitriding treatment, and the stepped deformed section copper strip is formed using the flat plate-shaped V-shaped die.

The first stepped modified cross-section copper strip manufacturing apparatus according to the present invention includes a V-shaped protrusion having a V-shaped diverging shape from the tip on a flat base surface, and a tip of the V-shaped protrusion. At least a flat plate-like V-shaped die formed by a manufacturing process including grinding, and a groove portion provided so as to pass through the substantially central portion of the V-shaped projection to the rear; After pressing the flat copper sheet material to be processed against the surface of the V-shaped die on which the V-shaped projections are formed, and performing the press pressing process, the flat copper sheet material is converted into the gold By performing a drawing process of moving from the V-shaped tip of the mold to the rearwardly widened portion, a portion of the flat plate-shaped copper strip material that has passed through the groove portion of the flat plate-shaped V-shaped die is formed as a thick plate portion, A portion of the flat plate-shaped V-shaped die via the V-shaped projection is formed as a thin plate portion. An apparatus for manufacturing a stepped irregular cross-section copper strip, which forms a stepped irregular cross-section copper strip, wherein the flat plate-shaped V-shaped die is at least on the surface of the V-shaped projection. It is characterized by being subjected to a surface treatment for reducing the difference between the surface roughness in the direction parallel to the moving direction and the surface roughness in the orthogonal direction.

  The second stepped irregular cross-section copper strip manufacturing apparatus of the present invention is the above-described first stepped irregular cross-section copper strip manufacturing apparatus, wherein the flat plate-shaped V-shaped die is further at least the V-shaped. It is characterized in that the surface of the protrusion is coated with CrN.

  The third stepped irregular cross-section copper strip manufacturing apparatus of the present invention is the above-mentioned first stepped irregular cross-section copper strip manufacturing apparatus, wherein the flat plate-shaped V-shaped die is further at least the V-shaped. It is characterized by nitriding the surface of the protrusion.

  According to the present invention, the difference between the surface roughness in the direction parallel to the moving direction of the tabular copper strip and the surface roughness in the orthogonal direction is at least the surface of the V-shaped protrusion in the flat plate-shaped V-shaped die. Since the surface treatment to be reduced was performed and a stepped irregular cross-section copper strip was formed using the flat plate-like V-shaped die, the flat copper strip during rolling using the flat plate-shaped V-shaped die The material flow in the direction parallel to the moving direction of the thin plate portion (that is, the portion rolled by passing through the V-shaped projection) (the size of elongation; the same applies hereinafter) and the material flow in the orthogonal direction Therefore, it is possible to balance appropriately, or to eliminate almost all of the differences, and as a result, it is possible to eliminate the waviness phenomenon of the thin plate portion and to ensure the flatness of the thin plate portion.

In particular, after performing the surface treatment for adjusting the surface roughness of the V-shaped projection as described above, the surface of at least the V-shaped projection in the flat plate-shaped V-shaped die is coated with CrN. Further, it is possible to ensure further durability (abrasion resistance) of the surface of the flat plate-like V-shaped die.

  Further, in particular, after performing a surface treatment for adjusting the surface roughness of the V-shaped projection as described above, by performing nitriding treatment on at least the surface of the V-shaped projection in the flat plate-like V-shaped die, Further durability (abrasion resistance) of the surface of the flat plate-shaped V-shaped die can be ensured.

Hereinafter, the manufacturing method and manufacturing apparatus of the step-shaped irregular cross-section copper strip which concern on this Embodiment are demonstrated with reference to drawings.
FIG. 1 is a diagram showing a flat plate-like V-shaped die used in a manufacturing method and manufacturing apparatus for a stepped irregular cross-section copper strip according to the present embodiment, and FIG. 2 is a stepped irregular cross-section according to the present embodiment. The side view which shows typically the structure of the principal part of the manufacturing apparatus of copper strip material, and its operation | movement, FIG. 3 is a top view which shows the structure and operation | movement of the manufacturing apparatus shown in FIG.

The flat plate-like V-shaped die 1 has V-shaped protrusions 2a and 2b that form a V-shaped divergent shape from the tip.
And a groove portion 3 provided so as to penetrate substantially the center thereof is provided on the flat upper surface of the base 4.
As shown in FIG. 1, the planar shape of the V-shaped protrusions 2a and 2b is V-shaped from the pointed tip to the end, and a groove 3 is provided so as to penetrate the center. Yes. This V
The slopes 11a and 11b constituting the V-shaped outer shape of the letter-shaped protrusions 2a and 2b have an appropriate inclination angle so that the flat copper strip material to be processed can be smoothly rolled. Is given.
Flat base surfaces 5a and 5b are exposed on both sides of the V-shaped projections 2a and 2b. The base surfaces 5a and 5b and the bottom surface of the groove 3 are continuous as the same plane. In other words, the base surfaces 5a and 5b and the bottom surface of the groove portion 3 have the same height.
The flat plate-shaped V-shaped die 1 is manufactured by grinding a metal block material for producing a mold.

  And at least on the surfaces of the V-shaped projections 2a and 2b, the surface roughness in the width direction (direction perpendicular to the moving direction of the flat copper strip 6) and the longitudinal direction (movement of the flat copper strip 6). Surface treatment such as blast treatment is performed so that the surface roughness in a direction parallel to the direction is substantially uniform within a predetermined error range.

As shown in FIG. 2, the flat copper strip 6 to be processed is pressed by the pressing roll 8 against the surface on which the V-shaped protrusion 2 of the flat plate-shaped V-shaped die 1 is formed. A predetermined pressing pressure is applied to perform so-called press pressing with the V-shaped protrusion 2. At this time, the pressing roll 8 applies a pressing force to press the flat copper strip 6 against the flat V-shaped die 1 while reciprocating along the longitudinal direction of the flat copper strip 6. ing. Subsequently, in conjunction with the movement of the pressing roll 8, the flat copper strip 6 is moved backward from the V-shaped tip of the V-shaped protrusion 2 to the rear end along the longitudinal direction (FIGS. 1 and 2). 3 in the direction indicated by the arrow 7 in FIG.
Then, by passing through the V-shaped protrusion 2 of the flat plate-shaped V-shaped die 1 in the flat-plate-shaped copper strip 6, the width direction of the flat copper strip 6 along the shape of the end of the V-shaped protrusion 2 is widened. And the part thinned by extending in the longitudinal direction of the flat copper strip 6 (drawn and rolled) becomes the thin plate portions 9a and 9b. On the other hand, the portion of the flat copper strip 6 that has passed through the groove 3 of the flat plate-shaped V-shaped die 1 passes through the flat plate-shaped V-shaped die 1 with a much smaller rolling amount than the V-shaped projection 2. Therefore, this portion becomes the thick plate portion 10.
In this way, a stepped deformed cross-section copper strip formed by mixing the thin plate portions 9a and 9b and the thick plate portion 10 in the width direction is manufactured.

  In the processing process of this stepped irregular cross-sectional shape, as shown in FIG. 3, the flat copper strip 6 to be processed passes along the V-shaped protrusion 2 from the tip of the V-shape through the inclined surface 11 and thereafter. By rolling toward the end, the portion of the flat copper strip 6 that has passed through the V-shaped projection 2 becomes the thin plate portions 9a, 9b. At this time, as described above, the V-shaped projection Surfaces 2a and 2b are subjected to a surface treatment such as blasting, and the surface roughness in the width direction (perpendicular to the moving direction of the flat copper strip 6) and the longitudinal direction (flat copper strip). Since the surface roughness in the direction parallel to the moving direction of the material 6 is substantially uniform within a predetermined tolerance, the sheet 6 is rolled through the V-shaped projections 2a and 2b and thinned. Width direction of the flat copper strip 6 to be converted (with respect to the moving direction of the flat copper strip 6) The magnitude of the material flow in the orthogonal direction) (also referred to as the amount of extension or elongation; the same applies hereinafter) and the magnitude of the material flow in the longitudinal direction (parallel to the moving direction of the tabular copper strip 6), The balance can be appropriately balanced, or the difference between the two can be almost eliminated. As a result, conventionally, the thin plate portions 9a and 9b that have been generated due to significant elongation in the longitudinal direction during rolling, It is possible to suppress or eliminate the occurrence of the wavy phenomenon of the thin plate portions 9a and 9b.

That is, the flat plate-like V-shaped die 1 which is a kind of metal mold for plastic working is generally manufactured by grinding a metal block material for producing a mold. The grinding direction is usually parallel to the moving direction (longitudinal direction) of the flat copper strip 6 to be processed. During the grinding process, the surface of the flat plate-shaped V-shaped die 1, particularly the V-shaped protrusions 2 a and 2 b, is extremely small, called a so-called grinding eye, which extends long in the grinding direction due to friction with abrasive grains. Streaking occurs. Due to this streak, the surface roughness of the V-shaped protrusions 2a, 2b is more perpendicular to the surface roughness in the moving direction of the flat copper strip 6, that is, the flat copper strip 6 The surface roughness in the width direction is rougher. Therefore, when the flat copper strip 6 is rolled using the conventional flat plate-shaped V-shaped die 1 having such a streak, the thin plate portions 9a and 9b are elongated in the longitudinal direction (material flow, Alternatively, the amount of extension) is significantly larger than the size of the elongation in the width direction, and the difference from the elongation of the thick plate portion 10 is further increased. Therefore, in such thin plate portions 9a and 9b, The present inventor has noticed that a more remarkable waviness phenomenon occurs. And based on this knowledge, the surface roughness in the direction parallel to the moving direction of the tabular copper strip 6 in the direction orthogonal to the surface of at least the V-shaped projections 2a, 2b in the flat plate-shaped V-shaped die 1 By subjecting the surface treatment to reduce the difference from the surface roughness (or to almost eliminate the difference), and rolling the stepped deformed cross-section copper strip using the flat plate-shaped V-shaped die 1, At the time of rolling using the flat plate-shaped V-shaped die 1, the elongation in the direction parallel to the moving direction and the elongation in the direction perpendicular to the moving direction in the thin plate portions 9 a and 9 b of the flat copper strip 6 are appropriately set. It is possible to balance or to eliminate the difference in elongation between them, and as a result, it is possible to eliminate the occurrence of the wavy phenomenon of the thin plate portions 9a and 9b and ensure the flatness thereof. That gave the idea. Then, it was confirmed that the waviness phenomenon can be surely eliminated by trying several embodiments as will be described later.

  More specifically, the adjustment of the surface roughness is performed in the longitudinal direction of the surfaces of the V-shaped protrusions 2a and 2b in the flat plate-like V-shaped die 1 (parallel to the moving direction of the flat copper strip 6). It is possible to align the surface roughness in the width direction so as to substantially match the surface roughness in the width direction by darely roughening the surface roughness in the direction).

  As described above, according to the manufacturing method and manufacturing apparatus for the stepped irregular cross-section copper strip according to the present embodiment, at least the surface of the V-shaped protrusions 2a and 2b in the flat plate-shaped V-shaped die 1 is used. The flat copper strip 6 is subjected to surface treatment to reduce the difference between the surface roughness in the direction parallel to the moving direction and the surface roughness in the orthogonal direction, and the flat copper strip is used by using the flat plate-shaped V-shaped die 1. Since the stepped irregular cross-section copper strip material is formed by processing the material 6, the flat copper strip material 6 in the thin plate portions 9a and 9b at the time of rolling using the flat plate-shaped V-shaped die 1 is used. The difference between the material flow in the direction parallel to the moving direction and the material flow in the orthogonal direction can be reduced or substantially eliminated. As a result, the significant divergence between the elongation of the thick plate portion 10 and the thin plate portions 9a and 9b can be greatly reduced or eliminated, and the occurrence of the undulation phenomenon of the thin plate portions 9a and 9b can be eliminated. It becomes possible to ensure the flatness of the entire stepped deformed cross-section copper strip material including 9a, 9b and the completed steps.

In addition, after performing the surface treatment for adjusting the surface roughness of the V-shaped protrusions 2a and 2b as described above, at least the surface of the V-shaped protrusions 2a and 2b in the flat plate-shaped V-shaped die 1 is made of CrN. By applying a coating (not shown), it is possible to ensure further wear resistance of the surface of the flat plate-shaped V-shaped die 1. As a result, it is possible to further reduce the frequency of changing the mold (flat plate-shaped V-shaped die) and to make it maintenance-free, thereby further improving the environmental impact by improving productivity and effectively using hardware resources and energy. It is also possible to achieve a reduction.
Alternatively, after performing a surface treatment for adjusting the surface roughness of the V-shaped protrusions 2a and 2b as described above, at least the surface of the V-shaped protrusions 2a and 2b in the flat plate-shaped V-shaped die 1 is subjected to nitriding treatment It is possible to ensure further wear resistance of the surface of the flat plate-shaped V-shaped die, and to achieve further reduction of environmental burden as in the case of CrN coating. Etc. are also possible.
Further, in the present embodiment, the case where one groove portion 3 of the flat plate-shaped V-shaped die 1 is provided so as to penetrate the center of the V-shaped protrusion 2 and to be divided right and left has been described. In addition, it is possible to provide two or more. That is, the V-shaped protrusion 2 is divided into three or more, and two or more thick plate portions 10 and three or more thin plate portions 9 are provided in the width direction of the single flat copper strip 6. It is also possible to do so.

A flat plate-shaped V-shaped die as described in the above embodiment was experimentally manufactured, and a flat copper strip was processed by actually using it to produce a stepped irregular cross-section copper strip.
FIG. 5 is a diagram collectively showing data on the surface roughness of the flat plate-shaped V-shaped die used in Example 1.

A flat plate-shaped V-shaped die (also referred to as a mold; hereinafter the same) 1 according to the first embodiment is made of a mold material SHK-51. grain) Abrasive grains were used, and surface treatment was performed by blast treatment set at an injection air pressure of 0.2 MPa.
As apparent from FIG. 5, the surface roughness of the flat plate-shaped V-shaped die 1 is substantially approximated in both the longitudinal direction and the width direction by this blasting process. In comparison with this, in the case of no treatment, both Ra and Ry have a surface roughness in the width direction that is nearly two to three times larger than the surface roughness in the longitudinal direction.

  FIG. 4 is a diagram showing enlarged photographs of the respective mold surfaces when such blasting is performed (FIG. 4A) and when no blasting is performed (FIG. 4B). . There are many substantially linear streaks on the mold surface (FIG. 4B) in the case of no treatment, but the mold surface in the case of blasting (FIG. 4A) is It can be seen that the strips have a substantially uniform satin shape, and the striations having clear directions are substantially completely erased.

Using the flat plate-like V-shaped die 1 subjected to such a surface treatment, the flat copper strip 6 is rolled by the manufacturing method as described in the above embodiment, and a step-shaped irregular cross-section copper is obtained. A strip was produced. The flat copper strip 6 used in Example 1 is a material made of a copper alloy, and the outer dimensions in an unprocessed state are a thickness of 1.9 mm and a width of 53 mm. The dimension after processing was set to a thickness of 1.67 mm for the thick plate portion and a thickness of 0.51 mm for the thin plate portion.
As a result, when the blast treatment was performed, the width of the thin plate portion 9 was about 4% wider than that in the case of no treatment. And the wavy phenomenon of the thin plate part 9 was eliminated.

  This is because, by performing blasting on the flat plate-shaped V-shaped die 1, the grinding marks that existed before the surface treatment is erased, and the longitudinal direction on the surface of the flat plate-shaped V-shaped die 1 is removed. Since the surface roughness in both directions in the width direction and the width direction are substantially equal (since there is substantially no difference in each surface roughness direction), the longitudinal direction of the flat copper strip 6 during rolling is increased. The material flow in the width direction is relatively increased and the material flow in the width direction is relatively increased. As a result, the elongation (or the amount of extension) in the longitudinal direction between the thin plate portion 9 and the thick plate portion 10 is balanced. This is presumably because the occurrence of the wavy phenomenon in the portion 9 is suppressed or eliminated.

  On the other hand, in the case of the unprocessed flat plate-shaped V-shaped die 1, a remarkable undulation phenomenon occurred in the thin plate portion 9. This is because, in the case of no treatment, the material of the thin plate portion 9 easily flows along the grinding marks during rolling, and therefore the plastic deformation in the longitudinal direction of the thin plate portion 9 is larger than the elongation of the thick plate portion 10. Thus, it is considered that a significant waviness phenomenon occurred in the thin plate portion 9 due to the significant difference in elongation.

In this Example 2, a flat plate-shaped V-shaped die 1 made of the same mold material SHK-51 as in Example 1 is produced mainly by a cutting method, and on the other hand, 60th ceramic beads are used as abrasive grains. The surface treatment as described in the above embodiment was performed by performing the blast treatment by setting the jetting air pressure to 0.2 MPa. As a result, the surface roughness Ra was about 0.4 μm.

Using the flat plate-like V-shaped die 1 subjected to such surface treatment, the flat copper strip 6 is rolled by the manufacturing method as described in the above embodiment, and the step-shaped irregular cross-section copper strip is rolled. A material was prepared. The flat copper strip 6 used in Example 2 was the same as that used in Example 1 above.
As a result, the width of the thin plate portion 9 was increased by about 4 to 5% compared to the case of no treatment. And the wavy phenomenon of the thin-plate part 9 was eliminated.

  This is because even if the grain size of the abrasive grains is different from that of Example 1, the surface roughness Ra of the flat plate-like V-shaped die 1 is somewhat large (rough), for example, 0.4 μm or more. Thus, the difference in surface roughness between the width direction and the longitudinal direction in the flat plate-shaped V-shaped die 1 is reduced or eliminated, and the material flow in the longitudinal direction of the flat copper strip 6 during rolling is reduced. The material flow in the width direction becomes relatively large as it decreases, and as a result, the elongation in the longitudinal direction of the thin plate portion 9 and the thick plate portion 10 is balanced, thereby suppressing the occurrence of the wavy phenomenon in the thin plate portion 9. It is thought that it was because it was solved.

In this Example 3, a CrN film (chromium nitride film; not shown) having a thickness of about 2 μm is coated on the surface of the flat plate-shaped V-shaped die 1 manufactured in Example 1 and subjected to the surface treatment. The same rolling process as in Example 1 was performed using the disk-shaped V-shaped die 1.
As a result, the width of the thin plate portion 9 was increased by about 4 to 5% compared to the case of no treatment. And the wavy phenomenon of the thin-plate part 9 was eliminated. Furthermore, it was confirmed that it can withstand about twice the processing quantity as compared with the case of Example 1 in which no coating was applied.

  Here, as the coating material, in addition to CrN, TiN, TiCN, etc. have been tried. However, when the material is thinly adhered to the surface after processing, or the material may be locally peeled off. there were. Accordingly, among these, CrN is the best processed state and has high durability (abrasion resistance). Therefore, it is confirmed that CrN is suitable when stepping copper strips. It was.

In this Example 4, the surface of the flat plate-shaped V-shaped die 1 manufactured in Example 1 and subjected to the surface treatment is subjected to ion nitriding treatment, and the flat plate-shaped V-shaped die 1 is used to perform the same as in the first example. The rolling process was performed.
As a result, the width of the thin plate portion 9 was increased by about 4 to 5% compared to the case of no treatment. And the wavy phenomenon of the thin-plate part 9 was eliminated. Furthermore, by performing the ion nitriding treatment, the wear resistance of the surface layer of the flat V-shaped die 1 was greatly improved, and the durability was further improved.

Here, as shown in FIG. 3, the maximum width of the V-shaped protrusions 2a and 2b is set to be larger than the width of the flat copper strip 6 to be processed. For this reason, on the surface of the conventional general V-shaped projections 2a and 2b, a portion where the tabular copper strip material 6 rubs and a portion where it does not arise. Then, in the portion where the flat copper strip 6 rubs, the wear of the V-shaped projections 2a, 2b of that portion progresses quickly due to this, but in the portion where the flat copper strip 6 does not rub, there is almost no wear. Not proceed. Therefore, on the surfaces of the V-shaped protrusions 2a and 2b, a clear step is generated in the vicinity of the boundary line between the portion where the tabular copper strip 6 rubs and the portion where it does not rub.
It was confirmed that such a step can be suppressed to about 1/7 when the ion nitriding treatment is performed as compared with the case of Example 1 where the step is not performed. This means that in simple calculation, when the ion nitriding treatment is performed, the durability can be secured seven times as compared with the case where the ion nitriding treatment is not performed.

In the above embodiment and each example, the case where the surface treatment of the flat plate-shaped V-shaped die is physically or mechanically performed by the blast method has been described. As a specific method of the surface treatment, In addition to this, it is of course possible to perform the process chemically by using a chemical solution, for example.
In addition, it goes without saying that various variations are possible without departing from the spirit of the present invention.

It is a figure which shows the flat disk-shaped V type die | dye used for the manufacturing method and manufacturing apparatus of the step-shaped irregular cross-section copper strip which concerns on one embodiment of this invention. It is a side view which shows typically the structure of the principal part of the manufacturing apparatus of the stepped irregular cross-section copper strip which concerns on one embodiment of this invention, and its operation | movement. It is a top view which shows the structure and operation | movement of the manufacturing apparatus shown in FIG. In the manufacturing apparatus of the step-shaped odd-shaped cross-section copper strip which concerns on Example 1, it is a figure which shows the enlarged photograph of each metal mold | die surface in the case of giving a blast process (a) and the case of no process (b). is there. It is a figure which shows collectively the data of the surface roughness of the flat disk-shaped V type | mold die which concerns on Example 1. FIG. It is a figure which shows the conventional flat disk-shaped V type | mold die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat plate-shaped V-shaped die 2 V-shaped protrusion 3 Groove part 4 Base 5 Base surface 6 Flat copper strip 8 Press roll 9 Thin plate part 10 Thick plate part 11 Slope

Claims (6)

On a flat base surface, a V-shaped projection having a V-shaped diverging shape from the tip, and a groove provided to divide the V-shaped projection from the tip of the V-shaped projection to the rear Using a flat plate-like V-shaped die formed by a manufacturing process including grinding, and a flat copper plate to be processed with respect to the surface on which the V-shaped projection of the flat plate-like V-shaped die is formed. After performing press press processing to press the strip material, and performing the press press processing, by performing a drawing process of moving the flat plate copper strip material from the V-shaped tip of the mold to the rearwardly widened end, the flat plate shape A portion of the copper strip material that has passed through the groove portion of the flat plate-shaped V-shaped die is a thick plate portion, and a portion of the flat plate-shaped V-shaped die that is connected to the V-shaped protrusion is a thin plate portion. This is a method for producing a stepped irregular cross-section copper strip material. And
The surface which reduces the difference between the surface roughness in the direction parallel to the moving direction of the flat copper strip and the surface roughness in the orthogonal direction with respect to at least the surface of the V-shaped protrusion in the flat plate-shaped V-shaped die. A method for producing a stepped irregular cross-section copper strip, which is processed to form the stepped irregular cross-section copper strip using the flat plate-shaped V-shaped die. In the manufacturing method of the step-shaped irregular cross-section copper strip of claim 1,
After the surface treatment, at least the surface of the V-shaped protrusion in the flat plate-like V-shaped die is coated with CrN, and the stepped irregular cross-section copper strip using the flat plate-shaped V-shaped die A method for producing a stepped irregular cross-section copper strip characterized by forming the step. In the manufacturing method of the step-shaped irregular cross-section copper strip of claim 1,
After performing the surface treatment, at least the surface of the V-shaped protrusion in the flat plate-like V-shaped die is subjected to nitriding treatment, and the stepped irregular cross-section copper strip is formed using the flat plate-shaped V-shaped die. The manufacturing method of the step-shaped irregular cross-section copper strip characterized by forming. Provided on a flat base surface so as to penetrate through a V-shaped projection having a V-shaped diverging shape from the tip, and through substantially the center of the V-shaped projection from the tip of the V-shaped projection to the rear. At least a flat plate-shaped V-shaped die formed by a manufacturing process including grinding, and processing the surface of the flat-plate-shaped V-shaped die on which the V-shaped projections are formed. After performing press pressing to press the target flat copper strip, and performing the press pressing, the drawing is performed to move the flat copper strip from the V-shaped tip of the mold to the rearwardly spread rear side. Thus, a portion of the flat plate-shaped copper strip material that has passed through the groove portion of the flat plate-shaped V-shaped die is formed as a thick plate portion, and a portion of the flat plate-shaped V-shaped die that passes through the V-shaped protrusion Stepped deformed cross-section copper forming a stepped deformed section copper strip as a thin plate part A strip manufacturing apparatus,
Surface treatment for reducing the difference between the surface roughness in the direction parallel to the direction of movement of the flat plate copper strip and the surface roughness in the direction perpendicular to the flat plate-shaped V-shaped die at least on the surface of the V-shaped projection. The manufacturing apparatus of the step-shaped irregular cross-section copper strip material characterized by the above-mentioned. In the manufacturing apparatus of the step-shaped irregular cross-section copper strip of claim 4,
The flat plate-like V-shaped die is further formed by coating CrN on at least the surface of the V-shaped projection, and the manufacturing device for the step-shaped irregular cross-section copper strip. In the manufacturing apparatus of the step-shaped irregular cross-section copper strip of claim 4,
The flat plate-like V-shaped die is further formed by performing nitriding on at least the surface of the V-shaped projection, and the manufacturing apparatus for a stepped irregular cross-section copper strip material.