JP2012011394A - Method of manufacturing deformed cross-section bar, and deformed cross-section bar for mounting led chip manufactured by the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin deformed cross-section bar of satisfactory dimensional precision, allowing LED-chip on board without depending on the processing such as half-etching or press working while preventing a yield from getting low caused by a material loss and a facility cost from increasing etc.SOLUTION: At least one part of an end edge part of a thick-walled part 7 is press-worked directed width-directionally inwards by each protrusion part 12 protruded from each small-diametric part 4, while forming the thick-walled part 7 by the small-diametric part 4 of a stepped roll 1, in width-directional both end parts of a planar material 5, when rolling the planar material 5 between the stepped roll 1 arrayed alternately with a plurality of large-diametric parts 3 and the plurality of small-diametric parts 4, and a flat roll 2 arranged parallel to the stepped roll 1, a residual thickness is set in a range of 0.3×T to 0.95×T of an edge groove part formed by press-working each end edge part of the thick-walled part, where T denotes a thickness of the thick-walled part, and a thickness of a thin-walled part is made to be 0.20 mm or less and the dimensional precision is made to be ±0.010 mm or less.

Description

  The present invention relates to a method for manufacturing a thin section having a thick portion and a thin portion arranged side by side in the width direction and having a good dimensional accuracy, and a substrate for mounting an LED chip manufactured by the manufacturing method. The present invention relates to a deformed cross-section copper alloy strip suitable for use in the manufacturing process.

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, one 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. By feeding and rolling, a deformed section having a thin part formed by the large diameter part and a thick part formed by the small diameter part is manufactured.
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, There is a problem that the corners are likely to have a bent shape.

In order to solve such a problem, there are technologies described in Patent Document 1 and Patent Document 2.
The technique described in Patent Document 1 is a stepped roll in which a plurality of large-diameter portions are arranged in the same cross-sectional shape, 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 on the inclined surface at the same angle as the inclined surface, the end-side thick part is insufficiently filled with material, In the thick part, the material can be sufficiently filled.
Moreover, in the technique described in Patent Document 2, in order to restrict 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 changed to the cross-sectional area of the thick part on the center part. A metal flow restricting ridge that is higher than the ridge for forming the thin portion (large diameter portion), and a recess corresponding to the metal flow restricting ridge. By disposing, the rolling is not performed between the metal flow regulating ridges and the ridges, so that no material flows in.

JP-A-6-328153 JP-A-7-39979

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, a loss occurs in the material and the yield is poor. Further, in the technique described in Patent Document 2, since the portion formed by the metal flow regulating ridges and the ridges is not a part to be used, material loss is similar to the technique described in Patent Document 1. As a result, it is difficult to form so as not to cause a metal flow, and the two rolls have a stepped shape, resulting in a problem of increased equipment costs.
Furthermore, in the manufacturing method in which such a copper strip material is processed into a modified cross-section shape with a stepped roll, the dimensional accuracy of the processing decreases as the thickness of the irregular cross-section strip material decreases, and 0.80 mm at the thick portion. In the following, it was technically difficult to form a thin deformed cross section having a thickness of 0.20 mm or less at a thin portion with a dimensional accuracy of ± 0.010 mm or less.

Recently, with the further evolution of LED lamps using light-emitting diodes, a chip-on-board (COB) type in which a plurality of LED chips are mounted on a substrate (board) and covered with a resin layer has been developed. The board used for such chip-on-board is thin (with a thickness of 0.80 mm or less, with a thickness of less than 0.80 mm, which is balanced with thermal conductivity, press workability, conductivity, and mechanical strength. A copper alloy strip having a deformed cross section with a thickness of 0.20 mm or less, or a copper alloy strip having a deformed cross section having a plating treatment that imparts gloss, heat resistance and contact resistance to the outermost surface thereof is used.
It is very difficult to produce such thin chip-on-board type copper alloy strips with irregular cross-sections with the conventional method for producing irregular cross-section strips, and half-etching or pressing a flat thin copper plate The strips have irregular shapes with irregularities, which takes time for processing and increases the manufacturing cost.

  The present invention does not cause a decrease in yield due to material loss, does not cause an increase in equipment costs, etc., and is thin and dimensioned so that an LED chip or the like can be chip-on-board without relying on processing such as half etching or pressing. It is an object of the present invention to provide a method for producing a modified cross-section strip with good accuracy, and a modified cross-section copper alloy strip suitable for a substrate for mounting an LED chip manufactured by the manufacturing method.

In the conventional manufacturing technology of the irregular cross-section strip, the end portion side thick wall portion having the same shape as the product portion is added to the outside of the product portion (Patent Document 1), or the metal flow regulating convex strip portion and the concave strip portion By adding the part that is molded in (Patent Document 2), the product part is made not to generate a part that becomes insufficiently filled, and there is a part to be added other than the product part. Occurrence was inevitable.
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, it was thought that if the material was made to flow from both ends to the thick part, dripping of the thick part could be prevented.

  The method for producing a modified cross-section strip according to the present invention rolls a flat plate material 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. A method of manufacturing a deformed cross-section in which a plurality of thick portions and thin portions are arranged in the width direction, and when rolling the flat plate material between the step roll and flat roll, At the both ends in the width direction of the flat plate-shaped material, while forming thick portions by the small diameter portion of the stepped roll, at least a part of the edge portion of the thick portion is formed by the projecting ridge portion protruding from the small diameter portion. The thickness of the portion remaining by the edge groove formed by pressing the inner edge in the width direction and pressing the edge of the thick portion is Tmm. Is set within a range of 0.3 × Tmm to 0.95 × Tmm, and the thickness of the thin portion is 0.20 mm or less, It is characterized in that a deformed cross section having a thickness dimensional accuracy of ± 0.010 mm or less is manufactured.

  In this deformed cross section, in the step portion between the thick portion located at both ends in the width direction and the thin portion adjacent to the inside, the corner portion between the upper surface and the side surface of the thick portion (the thick portion) In order to avoid a lack of thickness at the end of the strip in the width direction of the strip), at least a part of the end edge of the thick portion is pressed inward in the width direction, By causing the metal flow to move the material from the edge portion toward the corner portion on the inner side in the width direction, the lack of the portion is prevented.

Further, by pressing the edge portion of the thick portion, a groove portion is formed in that portion, and the thickness of the portion remaining by this edge groove portion is set to 0. 0 mm with respect to the thickness Tmm of the thick portion. By setting the range of 3 × Tmm to 0.95 × Tmm, it becomes possible to effectively flow the material of the portion toward the corner portion.
If the thickness of the portion remaining by the edge groove portion is less than 0.3 × Tmm, the thin portion is likely to be deformed, and even if it exceeds 0.95 × Tmm, the metal flow is not sufficient, and the dimensional accuracy of processing deteriorates.
Also, in the method for manufacturing a deformed section strip according to the present invention, the thickness of the thick section of the deformed section strip is 0.2 mm, and the thickness of the thin section is 0.1 mm with good dimensional accuracy (± 0.010 mm or less). It is the limit of the thickness and width that can be made, and if the thickness is less than these, the dimensional accuracy is deteriorated, and cracking and deformation are likely to occur.
By adopting such a manufacturing method, it is possible to manufacture a thin profile section having a thick portion and a thin portion and good dimensional accuracy without processing such as half etching or pressing.

Further, the irregular cross-section for mounting the LED chip of the present invention is an irregular cross-section manufactured by the manufacturing method of the present invention, and has a recess in which the LED chip is mounted on the upper surface of the thick portion. To do.
By obtaining an irregular cross-section having an appropriate concave portion on the upper surface of the thick portion by etching or pressing, it becomes possible to deal with LED lamps having various valuations.

Also, the irregular cross-section strip for mounting the LED chip of the present invention is an irregular cross-section strip manufactured by the manufacturing method of the present invention, and a plating layer having a glossiness of 80% or more is formed on the surface. The substrate used for such a chip-on-board is a thin type (0.8 mm or less at the thick portion and 0 at the thin portion) that balances thermal conductivity, press workability, conductivity, and mechanical strength. (2 mm or less thickness), or a copper alloy strip having a modified cross-section, or a copper alloy strip having a modified cross-section that is plated on the outermost surface to impart gloss, heat resistance, and contact resistance. It is preferable that the glossiness is 80% or more, particularly from the viewpoint of obtaining good light reflectivity as an LED lamp. When the glossiness exceeds 120%, the effect is saturated, and there is a tendency that the cost is wasted.

Furthermore, a plurality of plating layers may be applied to the surface of the copper alloy strip having an irregular cross section by plating treatment, and the outermost layer has a thickness of 0.01 to 2.0 μm and a glossiness of 80 to 120%. Sn-Ag, Sn-Ag-Au, Sn-Au, Sn-Pt, Ni-Au, Ni-Ag, Ni-Pd, or Ni-Pt plating is particularly preferable.
Further, the irregular cross-section strip for mounting the LED chip is a deformed cross-section strip manufactured by the manufacturing method of the present invention, having a concave portion on the upper surface of the thick portion, and having a glossiness of 80% or more on the surface. A plating layer is formed.
As a substrate used for such a chip-on-board, a thin shape (0.80 mm or less at the thick portion and 0. 0 mm at the thin portion) in which the thermal conductivity, press workability, conductivity, and mechanical strength are balanced. A copper alloy strip having a deformed cross section with a thickness of 20 mm or less) or a copper alloy strip having a deformed cross section whose outermost surface is plated with gloss, heat resistance and contact resistance is suitable. It is preferable that the glossiness is 80% or more, particularly from the viewpoint of obtaining good light reflectivity as an LED lamp. When the glossiness exceeds 120%, the effect is saturated, and there is a tendency that the cost is wasted.

Moreover, the irregular cross-section strip for LED chip mounting is a irregular cross-section strip manufactured by the manufacturing method of the present invention, and has a concave portion on the upper surface of the thick portion, and the surface has a glossiness of 80% or more. A layer is formed.
The irregular cross section having an appropriate recess in the thick portion by etching or press working makes it possible to deal with LED lamps having various valuations of complicated shapes.

  According to the present invention, it is possible to chip-on-board an LED chip or the like without reducing yield due to material loss, without causing an increase in equipment cost, and without relying on processing such as half etching or pressing. It is possible to provide a method for producing a thin cross-section strip with good dimensional accuracy and a cross-section copper alloy strip suitable for a substrate for mounting an LED chip manufactured by the manufacturing method.

It is a perspective view which shows the state which is rolling the plate-shaped raw material between the step roll and flat roll used in one Embodiment of the manufacturing method of the irregular cross-section 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 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 modification of the irregular cross-section manufactured with the method of one Embodiment, and is a longitudinal cross-sectional view of the irregular cross-section which has a recessed part in the upper surface of a thick part. It is the further modification of the irregular cross-section manufactured with the method of one Embodiment, and is a longitudinal cross-sectional view of the irregular cross-section with which the plating process was performed to the surface. 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).
Then, by passing the flat plate 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 θ1 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 plate-like material 5.
In this case, the ridge portion 12 is configured to press the flat plate 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 inward in the radial direction. The inclined surface is inclined at a predetermined angle θ2 with respect to the radial direction so as to approach the side surface 11 of the adjacent large-diameter portion 3 as it goes to the angle, and the angle between the side surface 13 and the outer peripheral surface is more than 90 °. Is also formed large. 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.
The angle θ1 of the side surface 11 of the large-diameter portion 3 and the angle θ2 of the side surface 13 of the ridge portion 12 are not particularly limited, but are preferably 5 to 60 °, and within the angle range, both The same angle may be set, or different angles may be set.

Next, a method for manufacturing the modified cross-section strip 8 from the flat plate material 5 by the manufacturing apparatus configured as described above will be described.
The flat plate 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 has a composition with the other being inevitable impurities. It is preferable to appropriately select a 0.3 to 1.0 mm copper alloy strip depending on the application.
Specifically, it is a copper alloy strip such as trade names OFC, TC, C151, TAMAC194, TAMAC4, TAMAC2, DC1B, ZC, and MZC1 manufactured by Mitsubishi Shindoh Co., Ltd.
In particular, it is preferable to apply Cu-Fe-P-based TAMAC194, TAMAC4, TAMAC2, or Cu-Zr-based ZC or MZC1 having an excellent balance between strength and conductivity.
As shown in FIG. 1, when the flat plate material 5 is passed between the step roll 1 and the flat roll 2 and rolled, a thin portion 6 is formed by the large diameter portion 3 of the step roll 1, and the small diameter portion 4. Thus, the thick-walled portion 7 is formed, and the deformed cross-section 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, when the flat plate material 5 is compressed on the flat roll 2 by the large diameter portion 3 of the stepped roll 1, the flat plate material 5 is deformed into a deformed section strip 8. In the process, a metal flow is generated at the portion pressed by the large diameter portion 3 as indicated by a 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 thinned portion A as shown by a chain line will be formed between the large diameter portion 3 and the small diameter portion 4. By pressing the edge portion, as shown by the solid line arrow in FIG. 2, the material wraps 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. Since the inner side surface 13 of the ridge 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.

Therefore, at both end portions in the width direction, the corner portion formed between the side surface 11 of the large diameter portion 3 of the stepped roll 1 and the outer peripheral surface of the small diameter portion 4 is also closely filled with the material, as described above. It is possible to reliably prevent the occurrence of the thin part A and to form the thick part 7 with high accuracy.
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.

  Thus, according to this manufacturing method, the edge part of the thick part 7 formed in the width direction both ends of the irregular cross-section strip 8 is pressed with the convex strip part 12, and it processes so that a material may be brought inside. Therefore, the inner corner of the thick portion 7 is closely filled with the material, so that a highly accurate deformed cross section 8 can be manufactured. The thick portion 7 is 0.80 mm or less, and the thin portion 6 is 0. It is possible to obtain a thin deformed section strip 8 having a thickness of 20 mm or less and a dimensional accuracy of ± 0.010 mm or less. The thickness of the thick part 7 is 0.20 mm, and the thickness of the thin part 6 is 0.10 mm, which is the limit that can be processed with good dimensional accuracy (± 0.010 mm or less). , Cracking and deformation are likely to occur.

  In particular, when used as a substrate on which an LED chip is mounted, the aforementioned Fe: 1.5 to 2.6 mass%, P: 0.008 to 0.08 mass%, and Zn: 0.01 to 0.00. In a copper alloy strip containing 5% by mass, the balance being Cu and inevitable impurities, after rolling with the stepped roll 1 and the flat roll 2, parts other than the part where the LED chip is mounted (resin is molded The portion to be roughened may be roughened with a surface treatment agent. And the orientation density of the Cube orientation measured by the EBSD method in the crystal structure in the depth range of 10 μm from the surface of the copper alloy strip is 10 to 20%, and the average crystal grain size measured by the EBSD method 12 to 20 μm, the maximum height Rz of the surface of the portion where the surface of the copper alloy strip has been roughened by the surface treatment agent is 1.0 to 2.0 μm, and the surface of the portion that has not been roughened The arithmetic average roughness Ra is 0.02 to 0.05 μm, the maximum height Rz is 0.20 to 0.40 μm, and the ratio Rq / Rz of the root mean square roughness Rq to the maximum height Rz is 0.10. The use of a copper alloy strip excellent in heat dissipation and resin adhesion of ˜0.25 is particularly preferable for LED chip mounting.

FIG. 5 shows a modification of the irregular cross-section strip. In this modified cross-section strip 31, a concave portion having a slight depth is formed on the upper surface of the thick section 7 of the modified cross-section strip manufactured by rolling the stepped roll 1 and the flat roll 2 in the same manner as the manufacturing method of the embodiment. 32 is formed. The concave portion 32 is formed by etching or pressing the upper surface portion of the thick portion 7 after rolling with the stepped roll 1 and the flat roll 2.
Then, the LED chip L is fixed in the concave portion 32 of the thick portion 7 as indicated by a chain line.

FIG. 6 shows a further modification of the irregular cross section. This modified cross-section 35 gives gloss, heat resistance, and contact resistance to the outermost surface of the modified cross-section manufactured by rolling the stepped roll 1 and the flat roll 2 in the same manner as the manufacturing method of one embodiment. Plating treatment is applied. The plating layer 36 provided on the outermost surface preferably has a glossiness of 80% or more from the viewpoint of obtaining good light reflectivity as an LED lamp, and the effect is saturated when the glossiness exceeds 120%. However, there is a tendency to be wasted in terms of cost.
The plating layer 36 may be composed of a single layer such as a silver plating layer or a tin plating layer, but a plurality of plating layers may be applied to the surface of the irregular cross-section, and the outermost layer has a thickness of 0.01. Sn-Ag, Sn-Ag-Au, Sn-Au, Sn-Pt, Ni-Au, Ni-Ag, Ni-Pd, or Ni-Pt having a gloss of 80 to 120% at ~ 2.0 μm It is preferable that the bright plating layer which consists of is formed.
As for the Sn—Ag plating layer, it is particularly preferable that an Ag ₃ Sn alloy layer is formed on the Sn plating layer as a lower layer by the following method.
First, after removing the oxide film on the surface of the Sn plating layer by an electrochemical reduction method, an Ag plating layer is formed on the surface by a silver strike plating method using a cyan compound. A weak alkaline electrolytic degreasing solution is used as the electrolytic treatment solution.
The conditions for silver strike plating are as shown in Table 1 below.

Here, when the concentration of potassium potassium cyanide is less than 1 g / L, a desired area coverage cannot be obtained for the Sn-based plating layer, and when it exceeds 8 g / L, the Ag plating surface becomes rough. 1-8 g / L is preferable. And the thickness of the Ag plating layer formed by this silver strike plating shall be 0.01-0.5 micrometer. With Ag plating layer in this range, the final Ag 3 _Sn alloy layer can be set to a desired thickness.
Next, this Ag-plated treatment material is subjected to alloying and discoloration prevention treatment in an aqueous solution containing a benzothiazole compound. The alloying and discoloration prevention treatment conditions are shown in Table 2 below.

By immersing the Ag-plated treatment material in this treatment solution, Ag on the surface and Sn underneath are diffused and alloyed to form an Ag ₃ Sn alloy layer on the surface. Furthermore, the benzothiazole treatment solution by being immersed in the hydrophobic protective film is formed on the surface of the Ag 3 _Sn alloy layer, oxidation and discoloration are prevented.

  Mitsubishi Shindoh Co., Ltd. TAMAC194 copper alloy strip with a width of 50 mm and a thickness of 0.12 mm (Cu: 97.0% or more by mass, 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, with respect to the remaining thickness t of the edge portion at both ends in the width direction, the processing ratio with respect to the thickness T of the thick portion As shown in Table 3, a thin section having a thickness of 0.15 mm, a width of 4.0 mm, a thickness of the thick section 7 of 0.60 mm, and a width of 1.0 mm is manufactured. The processing accuracy of the thickness of was measured. The results are shown in Table 3.

  Moreover, the thickness of the thin portion is 0.09 mm, the width is 4.0 mm, the thickness of the thick portion 7 is 0.15 mm, the width is 1.0 mm, and the depth of the edge groove portion is 0.50T. As a result, a fine torsional deformation occurred in the entire deformed cross section, and the processing accuracy was ± 0.18 mm.

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 Step roll 2 Flat roll 3 Large diameter part 4 Small diameter part 5 Flat material 6 Thin part 7 Thick part 8 Deformed cross section 11 Side surface (inclined surface)
12 ridges 13 side surface (inclined surface)
14 Grooved portion 21 Stepped roll 22 Convex portion 23 Side surface (inclined surface)
31 Deformed section 32 Recess 35 Deformed section 36 Plating layer

Claims (4)

  A plate-shaped material made of a copper alloy 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, thereby producing a plurality of thick walls Is a method of manufacturing a deformed cross-section in which a thin portion and a thin portion are aligned in the width direction, and when rolling the flat material between the stepped roll and a flat roll, the width direction of the flat material At both ends, a thick portion is formed by the small-diameter portion of the stepped roll, and at least a part of the edge portion of the thick-wall portion is directed inward in the width direction by the projecting ridge portion protruding from the small-diameter portion. The thickness remaining by the edge groove formed by pressing the edge portion of the thick portion is 0.3 × T to 0, where T is the thickness of the thick portion. .95 × T, the thickness of the thin portion is 0.20 mm or less, and the dimensional accuracy is ± 0.010 mm or less. Method for producing a modified cross-strip, characterized in that to produce a modified cross-section strip.   A deformed cross-section manufactured by the manufacturing method according to claim 1, wherein a concave section for mounting the LED chip is provided on an upper surface of the thick portion.   An irregular cross-section strip manufactured by the manufacturing method according to claim 1, wherein a plating layer having a glossiness of 80% or more is formed on the surface.   3. The irregular cross-section for mounting an LED chip according to claim 2, wherein a plating layer having a glossiness of 80% or more is formed on the surface thereof.

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