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CN-121992246-A - Copper alloy sheet and deep-drawn product

CN121992246ACN 121992246 ACN121992246 ACN 121992246ACN-121992246-A

Abstract

The present invention relates to a copper alloy sheet material and a drawn product. Provided is a copper alloy sheet material which has excellent bending workability, can obtain excellent drawing workability, and can particularly reduce the formation of ears at the edges of a drawn product. The Copper alloy sheet has an alloy composition containing Cr in an amount of 0.10 to 1.00 mass%, the balance including Cu and unavoidable impurities, wherein the total area of crystal grains oriented in {011} <211>, {123} <634> S-orientation, and {112} <111> coppers orientation in the crystal orientation analysis by the EBSD method performed in the rolling surface measurement region is 25 to 38% of the area of the measurement region, and the area of crystal grains oriented in {001} <100> Cube orientation is 12% or more of the area of the measurement region.

Inventors

  • Dong Yaye
  • Gao Zesi

Assignees

  • 古河电气工业株式会社

Dates

Publication Date
20260508
Application Date
20251105
Priority Date
20241107

Claims (5)

  1. 1. A copper alloy sheet having an alloy composition containing Cr in a range of 0.10 to 1.00 mass%, the balance comprising Cu and unavoidable impurities, In the analysis of the crystal orientation by the EBSD method performed in the measurement region of the rolled surface of the copper alloy sheet material, A ratio of a total area of crystal grains oriented in a Brass orientation of {011} <211>, an S orientation of {123} <634>, and a Copper orientation of {112} <111>, to an area of the measurement region is 25% to 38%, respectively, and The area of the crystal grains oriented in the Cube orientation of {001} <100> is 12% or more of the area of the measurement region.
  2. 2. The copper alloy sheet according to claim 1, wherein the average grain size of the grains in the rolled surface is 15 μm or less.
  3. 3. The copper alloy sheet according to claim 1, wherein the alloy composition further contains at least 1 optional additive component selected from the group consisting of Mg, sn, zn, fe, si and Zr in a range of 0.05 mass% to 1.00 mass% in total.
  4. 4. A copper alloy sheet according to any one of claims 1 to 3, which is used as a drawing raw plate.
  5. 5. A drawn product obtained by drawing the copper alloy sheet according to any one of claims 1 to 3.

Description

Copper alloy sheet and deep-drawn product Technical Field The present invention relates to a copper alloy sheet material and a drawn product. Background The copper alloy sheet is used for, for example, connectors for electronic devices and automobile vehicles, lead frames, relays, switches, sockets, shields, shield cases, camera modules, heat dissipation members for liquid crystals and organic EL displays, and batteries, and is often subjected to press working such as bending working, drawing working, punching working, and drawing working. As such a Copper alloy for press working, for example, patent document 1 discloses a Copper alloy containing 0.10 to 0.50% by mass of Cr, 0.010 to 0.30% by mass of Ti, 0.01 to 0.10% by mass of Si, and 1.0 to 30% by mass of Cr/Ti, 3.0 to 30% by mass of Cr/Si, the balance including Copper and unavoidable impurities, the Copper alloy having a texture in which the total average area ratio of the Brass orientation {011} <211>, the S orientation {123} <634> and the coppers orientation {112} <111> is 40 to 70% when the crystal orientation of the Copper alloy is measured by the FESEM-EBSP method. In patent document 1, it is considered that when the total average area ratio of the Brass orientation {011} <211>, the S orientation {123} <634> and the coppers orientation {112} <111> is controlled to 40% -70%, a Copper alloy having excellent strength and conductivity and excellent bendability can be obtained with respect to the crystal orientation of the cu—cr—ti—si based alloy. Patent document 2 discloses a Copper alloy sheet containing 0.1 to 0.6 mass% of Cr, 0.01 to 0.30 mass% of one or both of Zr and Ti in total, the balance including Copper and unavoidable impurities, wherein in the crystal orientation analysis in EBSD measurement, the area ratio of Cube orientation {001} <100> is 10% or less, the area ratio of braiss orientation {110} <112> is 40% or less, the area ratio of encoder orientation {112} <111> is 20% or more, and the existence of 100000 second phase particles having a size of 0.1 μm or more is 2/mm. In patent document 2, it is considered that by controlling the area ratio and the second phase particle density of Cube orientation {001} <100>, brass orientation {110} <112>, and coppers orientation {112} <111>, in cu—cr- (Zr, ti) alloy, a Copper alloy sheet excellent in bending workability while maintaining conductivity and strength, and excellent in stress relaxation rate and young's modulus can be obtained. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2013-173988 Patent document 2 Japanese patent application laid-open No. 2019-157256 Disclosure of Invention Problems to be solved by the invention With recent increases in performance, high current, and miniaturization of electronic devices and automobile-mounted devices, press-formed products as components constituting the devices are increasingly required to have high mechanical properties and electrical conductivity (or thermal conductivity). In particular, in drawing parts used for electronic devices and automobile-mounted devices, for example, connectors, lead frames, relays, switches, sockets, shields, shield cases, camera module cases, vibration device cases, heat dissipation parts for liquid crystals and organic EL displays, batteries, probes (probes), gas shield valves, and the like, copper alloy plates made of materials that achieve both higher mechanical properties and electrical conductivity (or thermal conductivity) than copper alloys used in the past, that is, brass and zinc white copper, are required. As a material having such high strength and electrical conductivity (thermal conductivity), a cu—cr alloy is exemplified, but the elongation of the cu—cr alloy is insufficient and is not suitable for complicated processing, and therefore, a copper alloy sheet material formed of the cu—cr alloy having excellent bending workability and excellent drawing workability is required. The "drawing process" is one of sheet metal forming methods, and is typically a process for forming various shapes of bottomed containers such as cylinders, prisms, and cones by pressing a punch into a sheet metal. The term "drawn product" refers to a product formed by drawing, and is characterized in that the formed product has no seam. The term "drawn product" also includes products formed by combining a drawing process with another process different from the drawing process, for example, bending process, compression process, twisting process, and the like. When the depth of the drawing process is increased, the material is easily broken, and thus the process is often difficult. In this case, even if it is assumed that the work can be performed without breaking, large waves (ears) are easily formed on the edge of the obtained drawn work. In particular, in drawing processing in which the depth of a drawn product is large relative to the diameter of a punch at the time of processing,