JP2012024813A - Method of manufacturing copper alloy strip having variant cross section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a copper alloy strip having a variant cross section, that does not lower a yield due to the loss of material, does not increase the facility cost, etc., does not require a finishing rolling step, and forms a strip having the variant cross section so as to have such dimensional accuracy in the direction of thickness that an error is ≤±0.005 mm.SOLUTION: When rolling a planar copper material between a stepped roll 1 and a flat roll 2, thick portions 7 are formed in both lateral edges of the planer copper alloy plate by small-diameter portions 4 of the stepped roll 1 and, at the same time, at least part of an edge of the thick portion 7 is pressed inwardly in the direction of width by a ridge portion 12 projected from the small-diameter portion 4. When the thickness of the thick portion 7 is assumed as T, a thickness T1 which is the height of the edge groove formed by pressing the edge of the thick portion 7 is determined in a range of 0.3×T to 0.9×T, a thickness T2 of a thin portion 6 in adjacent with the thick portion 7 is determined in a range of 0.20×T to 0.85×T, and an angle θ between the side surface of the thick portion 7 having the edge groove and the normal line along the radial direction is determined in a range of 0 to 60°.

Description

  The present invention relates to a method for producing a deformed cross-section copper alloy strip, and in particular, does not reduce the yield due to material loss, does not cause an increase in equipment costs, does not require a finish rolling process, and in the thickness direction. The present invention relates to a method for producing a deformed cross-section copper alloy strip that can be formed with a dimensional accuracy of ± 0.005 mm or less.

As is well known, for example, a deformed cross section made of a metal such as a copper alloy is used for a lead frame or a substrate such as an LED or a power transistor. When manufacturing this modified cross-section strip, a rough rolling process for rolling a flat copper alloy material to form a modified cross-section molded material in which a thick part and a thin part are aligned in the width direction, and the rough rolling process For tempering the deformed cross-section molding material formed in the above, or for increasing the dimensional accuracy of the annealed deformed cross-section molding material and making it a product A finish rolling process.
In general, in the rough rolling or finish rolling process, one of a set of rolls is a stepped roll in which a plurality of large diameter portions and small diameter portions are alternately arranged, and the other is a flat roll. A deformed cross-section having a thin part formed by the large diameter part and a thick part formed by the small diameter part is manufactured by feeding and rolling the flat copper alloy material.

  In forming such a modified cross-section strip, both side surfaces of the large-diameter portion are appropriately inclined surfaces. In this case, it is necessary to sufficiently fill the corner portion between the inclined surface and the surface of the small-diameter portion. However, at both end portions in the width direction (both side portions of the strip), the material has a free end. Because it is easy to flow, in the thick part near the edge, it does not match the shape formed by the surface of the small diameter part of the roll and the inclined surface of the large diameter part, compared to the thick part of the central part in the width direction, The corners are likely to have a bent shape, and distortion during molding is likely to occur.

In order to solve such a problem, there are technologies described in Patent Document 1 and Patent Document 2.
In the technique described in Patent Document 1, a stepped roll in which a plurality of large-diameter portions are arranged in the same cross-sectional shape is used, and at the most end positions in the width direction, between the thick portion at the center and the thin portions on both sides thereof. By forming an end side thick part that continues from the thin part with an inclined surface having the same angle as the inclined surface, the end side thick part becomes insufficiently filled with material, but the center part that becomes the product In the thick part, the material can be sufficiently filled.
In the technique described in Patent Document 2, in order to regulate the metal flow of the material at both ends in the width direction of the roll, the cross-sectional area of the thick part on the end side is almost equal to the cross-sectional area of the thick part on the center part. A metal flow restricting ridge that is higher than the ridge (large diameter portion) for forming the thin-walled portion and a ridge corresponding to the metal flow restricting ridge are arranged at a position to be halved. By doing so, rolling is not performed between the metal flow regulating ridges and the ridges, so that no material flows in.

Further, Patent Document 3 discloses a technique for manufacturing a deformed cross-section molding material at a low cost by using a copper alloy material using wastes (copper alloy scraps with nickel plating, etc.) generated when manufacturing a lead frame material for semiconductors, etc. It is disclosed.
The technology described in Patent Document 3 manufactures a flat plate having a certain thickness in the plate thickness direction from an ingot, cold-rolls the flat plate with a deformed roll, and has a modified cross-section copper having a thickness different in the plate width direction. In producing an alloy sheet, a deformed cross-section copper alloy sheet having high heat resistance, high conductivity, and excellent bending workability without being annealed once in the middle or at the end of cold rolling with a deformed roll. The cold working rate of the thin wall portion is 30 to 90%. Ni: 0.03-0.5 mass%, P: 0.01-0.2 mass% is contained, Ni / P which is a mass ratio of Ni and P is 2-10, the remainder copper and unavoidable A copper alloy composed of impurities is used, and desirably contains Sn: 0.005 to 0.5% or / and Fe: 0.005 to 0.20%, and Zn: 0.005 to 0.5% as necessary. including.

JP-A-6-328153 JP-A-7-39979 JP 2007-39735 A

In the technique described in Patent Document 1, the end-side thick portion is a portion that cannot be used because the material is not sufficiently filled, and accordingly, the material is lost and the yield is poor.
In the technique described in Patent Document 2, the portion formed by the metal flow regulating ridge part and the groove part is not a part to be used, and therefore, as in the technique described in Patent Document 1, material loss occurs. Therefore, it is difficult to form the metal flow so as not to cause a metal flow, and the two rolls have a stepped shape, which causes a problem of increased equipment costs.
The technique described in Patent Document 3 can omit the annealing process at the time of the irregular cross-section molding material, but there is a slight problem in dimensional accuracy, and the finish rolling process cannot be omitted.

The present invention does not reduce the yield due to material loss, does not increase the equipment cost, etc., does not require a finish rolling process, and can be formed with a dimensional accuracy in the thickness direction of ± 0.005 mm or less. Provided is a method for producing a deformed cross-section copper alloy strip.
In particular, Fe; 0.05 to 0.15 mass%, P; 0.015 to 0.050 mass% and Zn; 0.01 to 0.20 mass%, Ni; 0.01 to 0.50 mass% By using a copper alloy material having a composition comprising Cu and inevitable impurities in the balance, a finish rolling process is not required and an annealing process is not required, and dimensional accuracy in the thickness direction is ± 0.003 mm or less A method for producing a deformed cross-section copper alloy strip to be formed into a metal is provided.

As a result of diligent study, the inventors of the present invention are that the thick portion becomes insufficiently filled because the metal flows so that the material escapes in both end directions in the width direction. Corresponding to the above, if the material is made to flow in the opposite direction from the opposite ends to the thick wall portion, the thick rolling portion can be prevented from sagging and the thin wall portion can be prevented from deforming, and the finish rolling process to increase the dimensional accuracy. It has been found that even if is omitted, the dimensional accuracy in the thickness direction of the irregular cross-section strip can be molded to ± 0.005 mm or less.
Moreover, Fe; 0.05-0.15 mass%, P; 0.015-0.050 mass% and Zn; 0.01-0.20 mass%, Ni; 0.01-0.50 mass% By applying the processing method of the present invention to a copper alloy material having a composition comprising Cu and inevitable impurities in the balance, the dimensional accuracy in the thickness direction of the irregular cross-section strip can be formed to ± 0.003 mm or less. I found out. In this case, since the copper alloy material itself has heat resistance, an annealing step for imparting heat resistance to the irregular cross section is naturally not necessary.

  From these findings, the method for producing a deformed cross-section copper alloy strip of the present invention includes a stepped roll in which a plurality of large diameter portions and small diameter portions are alternately arranged, and a flat roll arranged in parallel with the stepped roll. A method for producing a deformed cross-section copper alloy strip in which a plurality of thick portions and thin portions are aligned in the width direction by rolling a flat copper alloy material between the stepped roll and the flat roll When rolling the flat copper alloy material, the protrusions projecting from the small diameter portion while forming thick portions by the small diameter portions of the stepped rolls at both ends in the width direction of the flat copper alloy material. The edge portion of the thick portion when the thickness of the thick portion is set to T when the thickness of the thick portion is T The thickness T1 remaining by the edge groove formed by pressing is set in the range of T1 = 0.3 × T to 0.9 × T The thickness T2 of the thin portion adjacent to the thick portion is set in a range of T2 = 0.20 × T to 0.85 × T, and the side surface and the radius of the thick portion having the edge groove portion An angle θ formed with a perpendicular along the direction is set in a range of θ = 0 to 60 °.

When T1 is less than 0.3 × T, the dimensional accuracy in the thickness direction is lowered and torsional deformation occurs. When it exceeds 0.9 × T, the effect of suppressing metal flow is reduced, and the dimensional accuracy in the thickness direction is reduced. descend.
When T2 is less than 0.20 × T, the dimensional accuracy in the thickness direction is lowered and torsional deformation occurs. When it exceeds 0.85 × T, the effect of suppressing metal flow is reduced, and sagging occurs at the corners. It tends to occur and the dimensional accuracy in the thickness direction is reduced.
When the angle θ exceeds 60 °, the effect of suppressing the metal flow is weakened, and the corner portion is liable to be bent, and the dimensional accuracy in the thickness direction is also lowered.
In particular, when T is within the range of 0.5 to 0.8 mm, it becomes possible to mold the dimensional accuracy in the thickness direction of the irregular cross section within ± 0.005 mm, and when T is out of this range, the irregular cross section There is a tendency that the dimensional accuracy in the thickness direction of the strips decreases to about ± 0.008 mm.
Furthermore, since the dimensional accuracy in the thickness direction of the irregular cross section can be formed within ± 0.005 mm or less, a finish rolling step for increasing the dimensional accuracy can be omitted.

  Furthermore, in the method for producing a modified cross-section copper alloy strip of the present invention, the flat copper alloy material is Fe: 0.05-0.15 mass%, P: 0.015-0.050 mass%, and Zn: 0 .01 to 0.20 mass%, Ni; 0.01 to 0.50 mass%, with the balance being composed of Cu and inevitable impurities.

The flat copper alloy material having this component composition is particularly compatible with the method for producing a deformed section copper alloy strip of the present invention, and can be formed with a dimensional accuracy in the thickness direction of the deformed section strip of ± 0.003 mm or less. Become. In particular, T is preferably 0.5 to 0.8 mm, and when T is out of this range, there is a tendency that the dimensional accuracy in the thickness direction of the irregular cross-section strips decreases to about ± 0.005 mm.
Further, since the dimensional accuracy in the thickness direction of the irregular cross section can be formed within ± 0.003 mm, the finish rolling step for increasing the dimensional accuracy can be omitted, and the flat copper alloy material is Ni; Since it contains 0.01 to 0.050% by mass, it has heat resistance, and an annealing step for imparting heat resistance to the irregular shaped cross section is not required.

  Furthermore, the method for producing a deformed cross-section copper alloy strip according to the present invention is a copper alloy with nickel plating obtained from waste generated during the production of a semiconductor leadframe material or the like as a part of the raw material for producing the flat copper alloy material. It is characterized by using.

  Fe; 0.05 to 0.15 mass%, P; 0.015 to 0.050 mass% and Zn; 0.01 to 0.20 mass%, Ni; 0.01 to 0.50 mass% As a Ni source when manufacturing a flat copper alloy material having a composition consisting of Cu and inevitable impurities as the balance, use copper alloy scraps with Ni plating generated during machining of semiconductor leadframe materials, etc. As a result, waste can be recycled and the manufacturing cost can be reduced.

  The present invention does not cause a decrease in yield due to material loss, does not cause an increase in equipment costs, does not require a finish rolling process, and can be formed with a dimensional accuracy in the thickness direction of ± 0.005 mm or less. An irregular cross-section copper alloy strip can be produced.

It is a perspective view which shows the state which is rolling the flat copper alloy material between the step roll and flat roll used in one Embodiment of the manufacturing method of the irregular cross-section copper alloy strip which concerns on this invention. It is a longitudinal cross-sectional view which shows the rolling part of the stepped roll and flat roll of FIG. It is a front view of the stepped roll of FIG. It is a longitudinal cross-sectional view of the irregular cross-section copper alloy strip manufactured by the method of one Embodiment, (a) is the state after rolling, (b) shows the state which cut off the both-ends edge part after rolling. It is a fragmentary sectional view which shows the modification about the protruding item | line part of a stepped roll.

Next, an embodiment of the present invention will be described with reference to the drawings.
In this embodiment, it is preferable to use the manufacturing apparatus shown in FIG.
As shown in FIG. 1, the manufacturing apparatus includes a step roll 1 and a flat roll 2. The step roll 1 has a shape in which a plurality of large diameter portions 3 having a radius R1 and a plurality of small diameter portions 4 having a radius R2 are alternately arranged in the width direction. By setting the uniform radius R3, the outer circumferential surface is a flat circumferential surface without irregularities. The two rolls 1 and 2 are arranged with a gap therebetween and the axes P1 and P2 being parallel to each other, and are configured to be rotationally driven by a drive mechanism (not shown). By passing the flat copper alloy material 5 between the stepped roll 1 and the flat roll 2, the thin portion 6 and the thick portion correspond to the large diameter portion 3 and the small diameter portion 4 of the stepped roll 1. 7 is formed.

  In the illustrated example, the stepped roll 1 includes three large-diameter portions 3 arranged in the width direction via small-diameter portions 4, and both end portions are small-diameter portions 4. Each large-diameter portion 3 has an outer peripheral surface formed in parallel to the direction of the axis P1, and as shown in FIGS. 2 and 3, the width of the large-diameter portion 3 gradually increases as both side surfaces 11 go radially inward. Thus, the inclined surface is inclined at a predetermined angle with respect to the radial direction, and the outer peripheral surface of the small diameter portion 4 is formed in parallel to the direction of the axis P1. Therefore, the angle formed by the corner portion between the outer peripheral surface of the small diameter portion 4 and the side surface 11 of the large diameter portion 3 is larger than 90 °, and the corner portion between the outer peripheral surface of the large diameter portion 3 and the side surface 11. Is formed to be larger than 90 °, and the large-diameter portion 3 is formed to have a trapezoidal cross section. Further, the outer peripheral surface of the large diameter portion 3 and the side surface 11 are chamfered with a curvature radius r1 of 0.05 to 0.2 mm, for example.

Further, the small diameter portions 4 at both ends of the stepped roll 1 have a radius R4 that is smaller than the radius R1 of the large diameter portion 3 but larger than the radius R2 of the small diameter portion 4, and is slightly higher than the small diameter portion 4. A protruding ridge portion 12 is formed. The ridges 12 press the edge portions of the thick portions 7 formed at both ends in the width direction of the flat copper alloy material 5.
In this case, the ridge portion 12 is configured to press the flat copper alloy material 5 at the side edge portion located inward in the width direction of the stepped roll 1, and the side surface 13 of the portion is formed in the radial direction. The inclined surface is inclined at a predetermined angle with respect to the radial direction so as to approach the side surface 11 of the adjacent large-diameter portion 3 as it goes inward, and the angle between the side surface 13 and the outer peripheral surface is 90 °. It is formed larger than. Further, chamfering is performed between the inclined surface 13 and the outer peripheral surface with a curvature radius r2 of 0.1 to 0.2 mm.

Next, a method for manufacturing the modified cross-section strip 8 from the flat copper alloy material 5 using the manufacturing apparatus configured as described above will be described.
The flat copper alloy material 5 contains 97.0% by mass or more of copper, contains at least one metal such as Fe, P, Mg, Zn, Si, Ni, Sn, Zr, etc., and the other is an inevitable impurity. It is preferable to appropriately select a copper alloy material having a thickness of 0.6 to 1.0 mm depending on the application.
Specifically, it is a copper alloy strip such as trade names OFC, TC, C151, TAMAC194, TAMAC4, TAMAC2, DC1B, ZC, MZC1, etc., manufactured by Mitsubishi Shindoh Co., Ltd., and has an excellent balance between strength and conductivity. It is preferable to apply Cu-Fe-P-based TAMAC194, TAMAC4, TAMAC2, or Cu-Zr-based ZC or MZC1.
Furthermore, Fe; 0.05 to 0.15 mass%, P; 0.015 to 0.050 mass% and Zn; 0.01 to 0.20 mass%, Ni; 0.01 to 0.50 mass% It is particularly preferable to use a copper alloy material having a composition containing the balance of Cu and inevitable impurities.

  As shown in FIG. 1, when a flat copper alloy material 5 is passed between a step roll 1 and a flat roll 2 and rolled, a thin portion 6 is formed by a large diameter portion 3 of the step roll 1, and a small diameter is formed. A thick-walled portion 7 is formed by the portion 4, and a deformed cross-section copper alloy strip 8 in which the thin-walled portions 6 and the thick-walled portions 7 are alternately arranged in the width direction is formed.

In this case, as shown in FIG. 2, the flat copper alloy material 5 is compressed on the flat roll 2 by the large diameter portion 3 of the stepped roll 1, so that the flat copper alloy material 5 is deformed in cross section. In the process of being deformed to 8, a metal flow is generated at the portion pressed by the large diameter portion 3 as shown by the broken line arrow. Among these, in the part pressed by the outer peripheral surface of the large diameter part 3, from the thin part between the outer peripheral surface of this large diameter part 3 and the flat roll 2, between the adjacent small diameter part 4 and the flat roll 2 is provided. The material flows so as to wrap around the thick portion, and in the portion pressed by the side surface 11 of the large diameter portion 3, since the side surface 11 is an inclined surface, the large diameter portion 3 is interposed through the small diameter portion 4. The material flows toward the other adjacent large diameter portion 3. In such a metal flow, in the portion where the large diameter portion 3 is arranged on both sides of the small diameter portion 4, for example, the right half portion in FIG. Since the materials are pressed against each other toward the other large-diameter portion 3, the material is tightly filled in the groove-like portion formed between the large-diameter portion 3 and the small-diameter portion 4, so that the thickness is high. The part 7 can be formed.
On the other hand, since the material is pressed by the side surface 11 of the large-diameter portion 3 on the inside of the small-diameter portion 4 (the left half portion in FIG. 2) located at both ends of the stepped roll 1, the ridge portion 12 If there is no material, the material will escape to the outside, and a lacking portion A as shown by a chain line between the large-diameter portion 3 and the small-diameter portion 4 will be generated. 2 by pressing the end edge portion between the small diameter portion 4 and the flat roll 2 between the outer peripheral surface of the ridge portion 12 and the flat roll 2 as shown by solid arrows in FIG. Since the inner side surface 13 of the ridge portion 12 is an inclined surface, the side surface 13 presses the material toward the adjacent large diameter portion 3 via the small diameter portion 4.

  At this time, when the thickness T1 remaining by the edge groove portion 14 (see FIG. 4) formed by pressing the edge portion of the flat copper alloy material 5 is T, the thickness of the thick portion 7 is T. , T1 = 0.3 × T to 0.9 × T, and when the thickness of the thin portion 6 adjacent to the thick portion 7 is T2, T2 = 0.20 × T to 0.85 × The side surface (inclined surface between the thick portion 7 and the thin portion 6) 7a of the thick portion 7 having the edge groove portion 14 which is set in the range of T and is pressed is formed with a perpendicular along the radial direction. By setting the angle θ to a range of θ = 0 to 60 ° (90 to 150 ° in the angle formed by the outer peripheral surface of the thick portion 7 and the side surface 7a), the both ends of the widthwise direction of the stepped roll 1 The corner portion formed between the side surface 11 of the large diameter portion 3 and the outer peripheral surface of the small diameter portion 4 is also closely filled with the material, thereby reliably preventing the occurrence of the lacking portion A as described above. The thick portion 7 can be formed frequently, and the dimensional accuracy in the thickness direction of the irregular cross-section can be made ± 0.005 mm or less. Therefore, the subsequent finish rolling process and annealing process are unnecessary.

When T1 is less than 0.3 × T, the dimensional accuracy in the thickness direction is lowered and torsional deformation occurs. When it exceeds 0.9 × T, the effect of suppressing metal flow is reduced, and the dimensional accuracy in the thickness direction is reduced. descend.
When T2 is less than 0.20 × T, the dimensional accuracy in the thickness direction is lowered and torsional deformation occurs. When it exceeds 0.85 × T, the effect of suppressing metal flow is reduced, and sagging occurs at the corners. It tends to occur and the dimensional accuracy in the thickness direction is reduced.
When the angle θ exceeds 60 °, the effect of suppressing the metal flow is weakened, and the corner portion is liable to be bent, and the dimensional accuracy in the thickness direction is also lowered.

  Furthermore, Fe; 0.05 to 0.15 mass%, P; 0.015 to 0.050 mass% and Zn; 0.01 to 0.20 mass%, Ni; 0.01 to 0.50 mass% If the copper alloy material which contains and the remainder consists of a composition which consists of Cu and an unavoidable impurity is applied, the dimensional accuracy of the thickness direction of a deformed cross-section can be set to +/- 0.003 mm or less.

  In addition, the edge groove part 14 slightly depressed as shown in FIG. 4A is formed at the edge part of the thick part 7 at both ends in the width direction by pressing with the protruding line part 12. However, the edge groove portion 14 may be cut off as shown in FIG. 4B or may be left in the range of 0 to 3 mm.

  Mitsubishi Shindoh Co., Ltd. TAMAC194 copper alloy material having a width of 50 mm and a thickness of 1.0 mm (by mass: Cu: 97.0% or more, Fe: 2.3%, P: 0.03%, Zn: 0.12 1), and using the manufacturing apparatus shown in FIG. 1, in the manufacturing method of the present invention, the thickness T of the thick portion and the edge formed by pressing the end portion of the thick portion The thickness T1 remaining by the groove part, the thickness T2 of the thin part, the angle θ between the side surface of the thick part having the edge groove part subjected to pressing and the perpendicular along the radial direction is changed as shown in Table 1, and the thickness is changed. Manufacturing a deformed section with a width of 1.0 mm and a width of a thin section of 4.0 mm, and processing the thickness of the thick and thin sections without subjecting the deformed section to a finish rolling step Was measured. In addition, as a comparative example, an irregular cross section having T, T1, T2, and θ changed as shown in Table 1 was manufactured, and the machining accuracy was measured in the same manner. The results are shown in Table 1.

  As is apparent from Table 1, it can be seen that the deformed cross-section copper alloy strip produced by the production method of the present invention has a dimensional accuracy of ± 0.005 mm or less without finish rolling.

  Copper alloy scraps with Ni plating on the surface are used as a Ni source, and a general method, for example, a copper alloy ingot is heated or homogeneously heated and then hot-rolled, and the hot-rolled plate is water-cooled and cooled. Fe; 0.05 to 0.15 mass%, P; 0.015 to 0.050 mass% and Zn; 0.01 to 0.20 mass%, manufactured by performing hot rolling and annealing Ni: 0.01 to 0.050% by mass, a copper alloy material having a composition consisting of Cu and unavoidable impurities in the balance is used, and the manufacturing apparatus shown in FIG. The thickness T of the thick portion, the thickness T1 remaining by the edge groove formed by pressing the edge portion of the thick portion, the thickness T2 of the thin portion, the edge groove portion subjected to the press processing By changing the angle θ between the side surface of the thick part having the vertical axis and the perpendicular along the radial direction as shown in Table 2, the thick part Manufacturing a deformed section with a width of 1.0 mm and a width of the thin section of 4.0 mm, and processing accuracy of the thickness of the thick section and the thin section without subjecting the deformed section to a finish rolling process and an annealing process Was measured. In addition, as a comparative example, an irregular cross section having T, T1, T2, and θ changed as shown in Table 2 was manufactured, and the machining accuracy was measured in the same manner. The results are shown in Table 2.

  As is apparent from Table 2, it can be seen that the deformed cross-section copper alloy strip manufactured by the manufacturing method of the present invention has a dimensional accuracy of ± 0.003 mm or less without finish rolling.

Furthermore, the sample was cut out from the thin part of the deformed cross-section copper alloy strips of Examples 2-1 to 2-6, heated at 400 ° C. for 5 minutes, and before and after that Vickers hardness (Hv) was measured. The measurement of Vickers hardness was performed by applying a weight of 4.9 N (0.5 kgf) with a micro Vickers hardness tester.
The results are shown in Table 3.

  As is apparent from Table 3, the deformed cross-section copper alloy strip produced by the production method of the present invention has sufficient heat resistance, and annealing treatment for imparting heat resistance is unnecessary. I understand that.

  From these results, according to the manufacturing method of the present invention, the yield is not reduced due to material loss, the equipment cost is not increased, the finish rolling process is not required, and the dimensional accuracy in the thickness direction is ± 0. It can be seen that a deformed cross-section copper alloy strip molded to 0.005 mm or less can be obtained.

The manufacturing method of the embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the said embodiment, although the corner | angular part between the side surface 13 and an outer peripheral surface was chamfered with the some curvature radius r2 to the protruding item | line part 12, of the protruding item | line part 22 of the stepped roll 21 shown in FIG. As described above, the radius of curvature r3 may be further increased so that the side surface 23 has a convex arc surface in cross section.
In short, the shape of the ridge portion is such that the side surface facing the inner side in the width direction of the stepped roll is inclined in a direction gradually approaching the side surface of the adjacent large diameter portion from the outer peripheral end toward the inner side in the radial direction. Any of a flat surface and a convex arc surface may be used.
Further, the number and dimensions of the thick and thin portions are not limited to the illustrated example, and the thickness and width of the plurality of thick portions may be set to the same size. These may be set to different dimensions.

DESCRIPTION OF SYMBOLS 1 Roll with a step 2 Flat roll 3 Large diameter part 4 Small diameter part 5 Flat copper alloy material 6 Thin part 7 Thick part 7a Side 8 Deformed cross-section copper alloy strip 11 Side (inclined surface)
12 ridges 13 side surface (inclined surface)
14 Grooved portion 21 Stepped roll 22 Convex portion 23 Side surface (inclined surface)

Claims (3)

  A flat copper alloy material is rolled between a stepped roll in which a plurality of large diameter portions and small diameter portions are alternately arranged, and a flat roll arranged in parallel with the stepped roll, and a plurality of thick portions A method for producing a deformed cross-section copper alloy strip in which thin portions are arranged in the width direction, and when rolling the flat copper alloy material between the stepped roll and a flat roll, the flat copper alloy material At the both ends in the width direction, the thick portion is formed by the small diameter portion of the stepped roll, and at least part of the edge portion of the thick portion is formed in the width direction by the protruding strip portion protruding from the small diameter portion. When the thickness of the thick part is T, the thickness T1 remaining by the edge groove formed by pressing the edge of the thick part is T. T1 = 0.3 × T to 0.9 × T is set, and the thickness T2 of the thin portion adjacent to the thick portion is T2 = The angle θ between the side surface of the thick portion having the edge groove portion and the perpendicular along the radial direction is set in the range of 0.20 × T to 0.85 × T, and θ = 0 to 60 °. A method for producing a modified cross-section copper alloy strip characterized by being set.   The flat copper alloy material is Fe; 0.05 to 0.15% by mass, P; 0.015 to 0.050% by mass and Zn; 0.01 to 0.20% by mass, Ni; 0.01 to The method for producing a deformed cross-section copper alloy strip according to claim 1, comprising 0.50% by mass, the balance being composed of Cu and inevitable impurities.   The deformed copper alloy according to claim 2, wherein a copper alloy with Ni plating obtained from a waste generated at the time of manufacturing a semiconductor lead frame material or the like is used as a part of a raw material for manufacturing the flat copper alloy material. Method for producing a cross-section copper alloy strip.

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