JP2012172244A - Copper alloy sheet with deformed cross section excellent in press workability, and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a copper alloy sheet with a deformed cross section, which is a Cu-Fe-P-based copper alloy plate with a deformed cross section, and high press workability, and a method for producing the same.SOLUTION: The copper alloy sheet with a deformed cross section has a thick part and a thin part arranged side by side in a width direction and has a composition comprising, by mass, 0.05-0.15% Fe, 0.015-0.050% P, 0.01-0.20% Zn and the balance being Cu and unavoidable impurities. When T1 and T2 represent the measured values for the thick part and the thin part, respectively, as measured by an EBSD method on a scanning electron microscope equipped with an electron backscattered diffraction imaging system, the ratio of orientation density of brass orientation (T1/T2) is 0.2-0.8, the ratio of orientation density of copper orientation (T1/T2) is 1.2-5.0, and the ratio of GOS (T1/T2) is 0.8-1.5.

Description

  The present invention relates to a modified cross-section copper alloy plate excellent in press workability and a method for producing the same, and more particularly, the copper alloy composition is Fe; 0.05 to 0.15 wt%, P; 0.015 to 0.050. The present invention relates to a deformed cross-section copper alloy sheet having a good press workability, and containing the remaining Cu and unavoidable impurities, and a manufacturing method thereof.

The deformed cross-section copper alloy plate with thick and thin parts aligned in the width direction is then stamped and bent by press working, and is used as a terminal material and lead frame material. In addition, electrical conductivity and heat dissipation are required.
Generally, this modified cross-section copper alloy plate is produced by a flat plate processing step for producing a flat plate having a certain thickness in the plate width direction from a copper alloy ingot, and a variant having a different thickness in the plate width direction using the flat plate. Manufactured by a profile processing step for producing a cross-sectional plate. The flat plate processing step includes soaking of the copper alloy ingot, hot rolling, cold rolling, annealing, and then cold rolling performed as necessary. In the special shape processing process, after processing the flat plate produced by the flat plate processing step into the final product shape, it is cut to the required width, followed by rough cold working, annealing, finish cold working, slitter processing, as required It consists of each process of correction performed. In this case, annealing may not be performed in the middle of cold working, but may be performed after finishing cold working. Further, the cold working in the deforming process is performed by cold rolling using a deformed roll, or cold rolling or forging using a deformed die, and different processing methods may be combined.

  In Patent Document 1, a flat plate having a certain thickness in the plate thickness direction is manufactured from the ingot, and the flat plate is cold-rolled by a deformed roll to obtain a modified cross-section copper alloy plate having a different thickness in the plate width direction. In manufacturing, a deformed cross-section copper alloy sheet having high heat resistance, high conductivity, and excellent bending workability is disclosed without being annealed once in the middle or at the end of cold rolling with a deformed roll. ing. 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 made of impurities is used. Desirably, it contains Sn: 0.005 to 0.5% or / and Fe: 0.005 to 0.20%. If necessary, it contains Zn: 0.005 to 0.5%. In the cold rolling with a deformed roll, the cold working rate of the thin portion is set to 30 to 90%.

  Patent Document 2 discloses a copper alloy strip for terminals and a method for manufacturing the same, which have good bending workability and can easily form a core crimping portion and a fitting convex portion with high strength. ing. A copper alloy strip for a terminal for manufacturing a terminal, which is composed of an aging precipitation type copper alloy, and a thick plate portion having a thick plate thickness in a cross section perpendicular to the longitudinal direction of the strip, and the thick plate And the ratio TS1 / TS2 between the tensile strength TS1 of the thick plate portion and the tensile strength TS2 of the thin plate portion is in the range of 1 <TS1 / TS2 ≦ 1.4. Is set to

JP 2007-39735 A JP 2009-9887 A

  Conventional Cu-Fe-P-based and Cu-Ni-Si-based deformed cross-section copper alloy plates place importance on heat resistance and bending workability as terminal materials and lead frame materials, and have a predetermined shape as a product. The press workability for molding cannot be said to be sufficient, and a deformed cross-section copper alloy plate with further improved press workability has been demanded in order to reduce the manufacturing cost.

  In the present invention, the alloy composition contains 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, respectively, and the balance Cu and Provided are a deformed cross-section copper alloy plate of Cu-Fe-P type that consists of inevitable impurities and has good press workability, and a method for producing the same.

As a result of diligent investigation focusing on the crystal structure of the Cu-Fe-P deformed cross-section copper alloy plate, the inventors have made a scanning electron microscope with a backscattered electron diffraction image system of the thick and thin portions. It has been found that press workability is improved by keeping the ratio of the Brass orientation density, the ratio of Copper orientation density, and the ratio of GOS measured by the EBSD method according to the above.
Moreover, in order to produce this deformed cross-section copper alloy sheet, the rough rolling process is performed by cold rolling with a die having a concavo-convex shaped surface, and the variation in the width of the copper alloy sheet before and after the process is optimally selected, The above-described EBSD method for the thick and thin portions is performed by optimally selecting the contact length and the contact angle of the copper alloy sheet with the rolling roll during the cold rolling with a deformed roll. It was found that the ratio of the Brass azimuth density, the ratio of the Copper azimuth density, and the ratio of GOS measured in the above can be within the optimum range.

  That is, the deformed cross-section copper alloy plate excellent in press punching workability of the present invention is a deformed cross-section copper alloy plate in which a thick portion and a thin portion are aligned in the width direction, and Fe: 0.05 to 0.15 mass %, P; 0.015 to 0.050% by mass and Zn; 0.01 to 0.20% by mass, each having a composition consisting of the balance Cu and inevitable impurities, with backscattered electron diffraction image system When the measured value of the thick part when measured by the EBSD method using the scanning electron microscope of T1 is T1, and the measured value of the thin part is T2, the ratio of the Brass orientation density (T1 / T2) is 0.2. -0.8, the ratio of Copper orientation density (T1 / T2) is 1.2-5.0, and the ratio of GOS (T1 / T2) is 0.8-1.5, To do.

The ratio of Brass orientation density (T1 / T2) by a scanning electron microscope with a backscattered electron diffraction image system exceeds 0.8, or the ratio of Copper orientation density (T1 / T2) exceeds 5.0, or If the ratio of GOS (T1 / T2) exceeds 1.5, the shear area during pressing increases and the press workability deteriorates. The ratio of Brass orientation density (T1 / T2) by a scanning electron microscope with a backscattered electron diffraction image system is less than 0.2, the ratio of Copper orientation density (T1 / T2) is less than 1.2, or GOS If the ratio (T1 / T2) is less than 0.8, the effect is saturated and the rolling cost during production increases.
Furthermore, the modified cross-section copper alloy sheet excellent in press punching workability of the present invention is characterized by containing 0.01 to 0.20% by mass of at least one element composed of Ni and Co.
Addition of these elements has a role of further improving heat resistance. If the added amount is less than 0.01% by mass, there is no effect, and if it exceeds 0.20% by mass, the conductivity is lowered.

  In addition, the method for producing a deformed cross-section copper alloy plate excellent in press punching workability according to the present invention is a method of rolling a flat copper alloy material to form a deformed cross-section copper alloy plate in which a thick portion and a thin portion are aligned in the width direction. A method of manufacturing, comprising: a die having a molding surface for forming the convex portion to be the thick portion and the concave portion to be the thin portion; a position facing the molding surface of the die; and a molding surface of the die The flat copper alloy when the pressing roll is in a position displaced from the molding surface of the die by a pressing roll that is reciprocated along the length direction of the molding surface of the die between the shifted position When the material is intermittently fed in the length direction and the pressing roll is at a position facing the die forming surface, the flat copper alloy material is sandwiched between the pressing roll and the die forming surface. The rough profile having the convex part and the concave part by rolling with Rough rolling process for producing a face copper alloy plate, a stepped roll in which a small diameter roll part for forming the thick part and a large diameter roll part for forming the thin part are formed side by side in the axial direction And a finish rolling process step of producing a deformed cross-section copper alloy plate by rolling the rough deformed cross-section copper alloy plate with a rolling roll comprising a flat roll whose radius is constant along the axial direction. Having a width of the flat copper alloy material W1 mm, a width of the rough deformed cross section copper alloy plate W2 mm, a contact length of the rolling roll and the rough copper alloy deformed cross section plate Lmm, and a contact angle When θ °, rough rolling and finish rolling are performed so that the value of (W1 / W2) × (L / θ) is in the range of 0.25 to 3.0.

In the rough rolling process, a ratio of Brass orientation density (T1 / T2), a ratio of Copper orientation density (T1 / T2), and a ratio of GOS (T1 / T2) by a scanning electron microscope with a backscattered electron diffraction image system Is made into a base that fits 80 to 90% within the predetermined range, and within the predetermined range in the finish rolling process.
W1 / W2 is preferably 0.5 to 0.9, and if it is less than 0.5, a load is excessively applied to the finish rolling process, and the Brass orientation density by a scanning electron microscope with a backscattered electron diffraction image system The ratio (T1 / T2), the ratio of Copper orientation density (T1 / T2), and the ratio of GOS (T1 / T2) are difficult to fall within the predetermined range. When it exceeds 0.9, it becomes difficult to fit into predetermined irregular dimensions in finish rolling.
The contact length L is the distance at which the rough copper alloy deformed cross-section plate is in contact with a plurality of sets of rolling rolls, and the contact angle θ is the thickness of the rough copper alloy deformed cross-sectional plate H ₀ and the thickness of the deformed cross-section copper alloy plate. When H ₁ , tan θ = {(H ₀ −H ₁ ) / 2} / L.
When (W1 / W2) × (L / θ) is less than 0.25 or more than 3.0, the ratio of the Brass orientation density by a scanning electron microscope with a backscattered electron diffraction image system (T1 / T2) The ratio of Copper orientation density (T1 / T2) and the ratio of GOS (T1 / T2) do not fall within the predetermined range.
Moreover, after rough rough rolling, annealing for tempering may be performed, and then finish rolling may be performed.

  According to the present invention, the alloy composition contains 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, respectively, with the balance Cu and It is possible to provide a deformed cross-section copper alloy plate made of inevitable impurities and having good press workability, and a method for producing the same.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a modified cross-section copper alloy plate according to the present invention in the order of manufacturing steps of a flat copper alloy material, a rough modified cross-section copper alloy plate, and a modified cross-section copper alloy plate. It is a front view which shows the state which is manufacturing the rough-shaped cross-section copper alloy board with die | dye and a press roll. It is a top view which shows the molding surface of the die | dye of FIG. It is a perspective view which shows the state which manufactures the irregular cross-section copper alloy plate with the rolling roll. It is a schematic diagram which shows the relationship between the contact length L and the contact angle (theta) of the rolling roll of FIG. 4, and a rough copper alloy irregular cross-section board. FIG. 6 is a dimensional relationship diagram of FIG.

With reference to FIGS. 1-6, one Embodiment of the irregular cross-section copper alloy plate of this invention is described.
The modified cross-section copper alloy plate 1 excellent in press punching workability of the present invention is a modified cross-section copper alloy plate (see FIG. 1) having a width W3 in which a thick portion 2 and a thin portion 3 are arranged in the width direction. , 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, respectively, and the balance consisting of Cu and inevitable impurities When the measured value of the thick part 2 is T1 and the measured value of the thin part 3 is T2 when measured by the EBSD method using a scanning electron microscope with a backscattered electron diffraction image system, the Brass orientation density Ratio (T1 / T2) is 0.2 to 0.8, Copper orientation density ratio (T1 / T2) is 1.2 to 5.0, and GOS ratio (T1 / T2) is 0.00. 8 to 1.5.
Moreover, the irregular cross-section copper alloy plate 1 may contain 0.01 to 0.20 mass% of at least one of elements made of Ni and Co. Addition of these elements has a role of further improving heat resistance. If the added amount is less than 0.01% by mass, there is no effect, and if it exceeds 0.20% by mass, the conductivity is lowered.

  The ratio of Brass orientation density (T1 / T2) by a scanning electron microscope with a backscattered electron diffraction image system exceeds 0.8, or the ratio of Copper orientation density (T1 / T2) exceeds 5.0, or If the ratio of GOS (T1 / T2) exceeds 1.5, the shear area during pressing increases and the press workability deteriorates. The ratio of Brass orientation density (T1 / T2) by a scanning electron microscope with a backscattered electron diffraction image system is less than 0.2, the ratio of Copper orientation density (T1 / T2) is less than 1.2, or GOS If the ratio (T1 / T2) is less than 0.8, the effect is saturated and the rolling cost during production increases.

GOS, Brass orientation density, and Copper orientation density were measured by the following methods.
Measurement of the average value of the average orientation difference between all the pixels in the crystal grains by the EBSD method is usually performed by dividing the measurement area of the sample into areas such as hexagons, and for each divided area on the sample surface. The Kikuchi pattern is obtained from the reflected electrons of the incident electron beam, the electron beam is scanned two-dimensionally on the sample surface, the orientation of all the pixels within the measurement area range is measured at a step size of 1.0 μm, and adjacent. A boundary where the orientation difference between pixels is 15 ° or more is regarded as a crystal grain boundary, and for all individual crystal grains surrounded by the crystal grain boundary, this is an average value of orientation differences between all pixels in the crystal grain. The average orientation difference (GOS: Grain Orientation Spread) was calculated by the equation (1), and the average value of all the crystal grains in the measurement region was defined as the average value of the average orientation difference in all the crystal grains. In addition, the crystal grains are those in which two or more pixels are connected.

In the above formula, i and j indicate the numbers of pixels in the crystal grains.
n indicates the number of pixels in the crystal grains.
α _ij represents the difference in orientation between pixels i and j.

  The measurement of the Brass orientation density by the EBSD method usually divides the measurement area of the sample into areas such as hexagons, and for each divided area, obtains a Kikuchi pattern from the reflected electrons of the electron beam incident on the sample surface. The surface of the sample is scanned two-dimensionally on the sample surface, the orientation of all pixels within the measurement area range is measured at a step size of 1.0 μm, and the boundaries where the orientation difference between adjacent pixels is 15 ° or more are crystal grains. Considering the boundary, the distribution of crystal grains on the sample surface was determined. Then, it was determined whether or not each crystal grain had a target Brass orientation (within 15 ° from the ideal orientation), and the Brass orientation density (area ratio of crystal orientation) in the measurement region was determined.

  The measurement of Copper orientation density by the EBSD method usually divides the measurement area of the sample into areas such as hexagons, and for each divided area, obtains a Kikuchi pattern from the reflected electrons of the electron beam incident on the sample surface, The surface of the sample is scanned two-dimensionally on the sample surface, the orientation of all pixels within the measurement area range is measured at a step size of 1.0 μm, and the boundaries where the orientation difference between adjacent pixels is 15 ° or more are crystal grains. Considering the boundary, the distribution of crystal grains on the sample surface was determined. Then, it was determined whether or not each crystal grain had a target Copper orientation (within 15 ° from the ideal orientation), and a Copper orientation density (area ratio of crystal orientation) in the measurement region was determined.

Next, the manufacturing method of the irregular cross-section copper alloy plate of this invention is demonstrated.
First, 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, respectively, with the balance being Cu and inevitable impurities A flat copper alloy material 10 having a composition width W1 is prepared.
Then, as shown in the order of the arrows in FIG. 1, the flat strip copper alloy material 10 is cold-rolled cold by the die 11 and the pressing roll 12 shown in FIGS. 4 is formed into a rough deformed cross-section copper alloy plate 15 formed with a concave portion 14 for forming a convex portion 13 and a thin portion 3, and then the rough deformed cross-section copper alloy plate 15 is flattened with a stepped roll 16 shown in FIG. It is cold-finished by a rolling roll 18 composed of a roll 17 and formed into a deformed section copper alloy plate 1 having a thick portion 2 and a thin portion 3.

As shown in FIGS. 2 and 3, the die 11 for forming the rough deformed cross-section copper alloy plate 15 has two protrusions for forming the recess 14 through the groove 21 for forming the protrusion 13. The pressing roll 12 is indicated by an arrow between a position facing the molding surface 23 of the die 11 and a position shifted from the molding surface 23 of the die 11. In this way, the die 11 is reciprocated along the length direction of the molding surface 23 of the die 11. When the pressing roll 12 is in a position displaced from the molding surface 23 of the die 11 by the die 11 and the pressing roll 12, the flat copper alloy material 10 is intermittently fed in the length direction, and the pressing roll 12 is moved to the die 11. When the surface is opposite to the forming surface 23, the copper alloy material 10 is sandwiched between the pressing roll 12 and the forming surface 23 of the die 11 and rolled to form a rough deformed cross-section copper alloy having a width of W2. The plate 15 is manufactured.
In this case, W1 / W2 is preferably 0.5 to 0.9. If it is less than 0.5, too much load is applied to the finish rolling process, and a Brass by a scanning electron microscope with a backscattered electron diffraction image system is used. The ratio of azimuth density (T1 / T2), the ratio of Copper azimuth density (T1 / T2), and the ratio of GOS (T1 / T2) are difficult to fit within the predetermined range. When it exceeds 0.9, it becomes difficult to fit into predetermined irregular dimensions in finish rolling.

  As shown in FIG. 4, a stepped roll 16 for finishing and rolling the rough deformed cross-section copper alloy plate 15 into a deformed cross-section copper alloy plate 1 includes a small-diameter roll portion 25 and a thin-wall portion for forming the thick portion 2. 3 is formed side by side in the axial direction, and the flat roll 17 has a constant radius along the axial direction. Then, the rough deformed cross-section copper alloy plate 15 is sandwiched and rolled by a rolling roll 18 composed of the stepped roll 16 and the flat roll 17. At this time, in both the thick part 2 and the thin part 3, when the contact length between the rolling roll 18 and the rough copper alloy deformed cross section plate 15 is Lmm and the contact angle is θ °, (W1 / W2) Finished rolling is performed so that the value of x (L / θ) is in the range of 0.25 to 3.0, and a deformed cross-section copper alloy sheet 1 having a width of W3 is manufactured.

As shown in FIGS. 5 and 6, the contact length L is the distance that the rough copper alloy deformed cross-section plate 15 is in contact with the rolling roll, and the contact angle θ is the thickness of the rough copper alloy deformed cross-section plate as H ₀ , the thickness of the modified cross-section copper alloy sheet 1 is taken as _{H 1,} represented by _{tanθ = {(H 0 -H 1} ) / 2} / L. The thick part and the thin part are almost formed in the outline in the rough rolling process before the finish rolling process, and in the finish rolling process, the surface of the convex part and the concave part is formed into a final shape. (L / θ) is adjusted according to the result of (W1 / W2) in the rough rolling process.
In this case, when (W1 / W2) × (L / θ) is less than 0.25 or more than 3.0, the ratio of the Brass orientation density by the scanning electron microscope with the backscattered electron diffraction image system (T1) / T2), the ratio of Copper orientation density (T1 / T2), and the ratio of GOS (T1 / T2) do not fall within the predetermined range.
Further, after rough rolling, annealing for tempering may be performed, and then finish rolling may be performed.

The alloy composition contains 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, respectively, from the remainder Cu and inevitable impurities The resulting ingot was subjected to hot rolling and cold rolling to produce a coil having a thickness of 2.0 mm and a width of 600 mm, and a strip material having a width of 70 mm was produced through a slitter line.
Using this strip as a raw material, a coil having a thickness of 2.0 mm × width of 70 mm is formed on the molding surface of the die having a molding surface for forming convex portions and concave portions at W1 / W2 shown in Table 1. When the pressing roll is in a position deviated from the molding surface of the die by the pressing roll that is reciprocated along the length direction of the molding surface of the die between the facing position and the position shifted from the molding surface of the die. The coil is intermittently fed in the length direction, and when the pressing roll is at a position facing the molding surface of the die, the coil is sandwiched between the pressing roll and the molding surface of the die and rolled, The width of the convex part to be 30 to 34 mm, the thickness of the concave part to be a thin part is 0.2 to 0.4 mm, the thickness of the convex part is 1.1 to 1.35 mm, the rising inclination angle β of the convex part 10 ° (See Fig. 1: 80 ° from the horizontal plane) It was manufactured.

  Next, in this rough deformed cross-section copper alloy plate, a small diameter roll part for forming a thick part and a large diameter roll part for forming a thin part are aligned in the axial direction at L / θ shown in Table 1. The thick roll is 29 to 32 mm wide, and the thickness of the thin wall is rolled by a rolling roll comprising a stepped roll formed with a flat roll whose radius is constant along the axial direction. Examples 1 to 10 in which the thickness is 0.15 to 0.32 mm, the thickness of the thick part is 1.0 to 1.20 mm, and the rising inclination angle β of the thick part is 10 ° (80 ° from the horizontal plane) The odd-shaped cross-section copper alloy plates of Comparative Examples 1 to 5 were continuously prepared.

  Samples were taken from each of the irregular cross-section copper alloy plates of Examples 1 to 10 and Comparative Examples 1 to 5, and the thick part and the thin part were measured by an EBSD method using a scanning electron microscope with a backscattered electron diffraction image system. The ratio of Brass orientation density (T1 / T2), the ratio of Copper orientation density (T1 / T2), and the ratio of GOS (T1 / T2) were determined.

Each GOS, Brass orientation density, and Copper orientation density were measured as follows.
Measurement of the average value of the average orientation difference between all the pixels in the crystal grains by the EBSD method is usually performed by dividing the measurement area of the sample into areas such as hexagons, and for each divided area on the sample surface. The Kikuchi pattern is obtained from the reflected electrons of the incident electron beam, the electron beam is scanned two-dimensionally on the sample surface, the orientation of all the pixels within the measurement area range is measured at a step size of 1.0 μm, and adjacent. A boundary where the orientation difference between pixels is 15 ° or more is regarded as a crystal grain boundary, and for all individual crystal grains surrounded by the crystal grain boundary, this is an average value of orientation differences between all pixels in the crystal grain. The average orientation difference (GOS: Grain Orientation Spread) was calculated by the equation (1), and the average value of all the crystal grains in the measurement region was defined as the average value of the average orientation difference in all the crystal grains. In addition, the crystal grains are those in which two or more pixels are connected.

In the above formula, i and j indicate the numbers of pixels in the crystal grains.
n indicates the number of pixels in the crystal grains.
α _ij represents the difference in orientation between pixels i and j.

  The measurement of the Brass orientation density by the EBSD method usually divides the measurement area of the sample into areas such as hexagons, and for each divided area, obtains a Kikuchi pattern from the reflected electrons of the electron beam incident on the sample surface. The surface of the sample is scanned two-dimensionally on the sample surface, the orientation of all pixels within the measurement area range is measured at a step size of 1.0 μm, and the boundaries where the orientation difference between adjacent pixels is 15 ° or more are crystal grains. Considering the boundary, the distribution of crystal grains on the sample surface was determined. Then, it was determined whether or not each crystal grain had a target Brass orientation (within 15 ° from the ideal orientation), and the Brass orientation density (area ratio of crystal orientation) in the measurement region was determined.

The measurement of Copper orientation density by the EBSD method usually divides the measurement area of the sample into areas such as hexagons, and for each divided area, obtains a Kikuchi pattern from the reflected electrons of the electron beam incident on the sample surface, The surface of the sample is scanned two-dimensionally on the sample surface, the orientation of all pixels within the measurement area range is measured at a step size of 1.0 μm, and the boundaries where the orientation difference between adjacent pixels is 15 ° or more are crystal grains. Considering the boundary, the distribution of crystal grains on the sample surface was determined. Then, it was determined whether or not each crystal grain had a target Copper orientation (within 15 ° from the ideal orientation), and a Copper orientation density (area ratio of crystal orientation) in the measurement region was determined.
The results are shown in Table 1.

Next, samples were taken from Examples 1 to 10 and Comparative Examples 1 to 5 to evaluate pressability.
The press conditions are as follows.
Punch diameter: 4.96 mm, punch hole diameter: 5.00 mm, clearance: 0.02 mm,
Punch speed: 1m / min
The press location was 2 thick-walled portions and 2 thin-walled portions, and the presence or absence of each burr, sagging, shear surface rate, and secondary shear surface was evaluated, and the average value of 4 locations was used as a representative value.
The burrs were visually observed at four cross-sections with an optical microscope (20 ×), and the burrs that were generated had an average height of less than 0.5 μm. did.
The sagging was visually observed at four locations with an optical microscope (20 ×).
The shear surface ratio was determined by visually observing the cross-sections at four locations with an optical microscope (20 ×), and discriminating between the shear surface and the fracture surface. Shear surface ratio = (shear surface area) / (shear surface area + fracture surface area) ). For those having a secondary shear surface, the stepped surface area including the area of the secondary shear surface was used.
As for the secondary shear plane, four cross-sections were visually observed with an optical microscope (20 times), and those where the secondary shear plane was not observed were marked with ◯, and those observed were marked with x.
The results of these measurements are shown in Table 2.

  From these results, it can be seen that the modified cross-section copper alloy sheet of the present invention has good press workability.

  As mentioned above, although the manufacturing method of the plated copper strip which is embodiment of this invention was demonstrated, this invention is not limited to this description, In the range which does not deviate from the technical idea of the invention, it can change suitably. is there.

DESCRIPTION OF SYMBOLS 1 Profile cross-section copper alloy plate 2 Thick part 3 Thin part 10 Flat copper alloy material 11 Die 12 Press roll 13 Convex part 14 Concave part 15 Coarse cross section copper alloy board 16 Stepped roll 17 Flat roll 23 Forming surface 26 Large diameter roll Part 27 Small-diameter roll part

Claims (3)

  It is a modified cross-section copper alloy plate in which a thick part and a thin part are arranged in the width direction, Fe; 0.05 to 0.15 mass%, P; 0.015 to 0.050 mass% and Zn; 0.01 Each of which has a composition composed of the balance Cu and inevitable impurities, and each of the thick-walled portion measured by the EBSD method using a scanning electron microscope with a backscattered electron diffraction image system. When the measured value is T1 and the measured value of the thin portion is T2, the ratio of the Brass orientation density (T1 / T2) is 0.2 to 0.8, and the ratio of the Copper orientation density (T1 / T2) is 1. A deformed cross-section copper alloy sheet excellent in press punching workability, characterized in that the ratio is 2 to 5.0 and the GOS ratio (T1 / T2) is 0.8 to 1.5.   The deformed cross-section copper alloy sheet excellent in press punching workability according to claim 1, wherein 0.01 to 0.20% by mass of at least one element of Ni and Co is contained.   A method for producing a deformed cross-section copper alloy plate excellent in press punching processability according to claim 1 or 2 by rolling a flat copper alloy material, wherein the convex portion and the thin portion become the thick portion, Reciprocating along the length of the die molding surface between a die having a molding surface to form a recess, and a position opposite to the die molding surface and a position offset from the die molding surface. When the pressing roll is in a position deviated from the molding surface of the die, the flat copper alloy material is intermittently fed in the length direction, and the pressing roll faces the molding surface of the die. And producing a rough deformed cross-section copper alloy plate having the convex portions and the concave portions by sandwiching the flat copper alloy material between the pressing roll and the forming surface of the die. Rough rolling process and forming the thick part A roll having a step diameter roll in which a small diameter roll part for forming the thin part and a large diameter roll part for forming the thin part are formed side by side in the axial direction, and a flat roll having a constant radius along the axial direction And a finish rolling step of producing a deformed cross-section copper alloy plate by sandwiching the rough deformed cross-section copper alloy plate and making the width of the flat copper alloy material W1 mm, and the rough deformed cross-section copper alloy When the width of the alloy plate is W2 mm, the contact length between the rolling roll and the rough copper alloy deformed section plate is Lmm, and the contact angle is θ °, the value of (W1 / W2) × (L / θ) is A method for producing a deformed cross-section copper alloy sheet excellent in press punching processability, characterized by subjecting rough rolling and finish rolling to a range of 0.25 to 3.0.

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