| 摘要 |
The invention relates to a wire electrode (1, 1′) for electric discharge cutting processes and a method for the production thereof. The wire electrode (1, 1′) has a core (2) containing a metal or a metal alloy, and a coating (3, 4; 3, 4, 5) that surrounds the core (2) and includes one or more coating layers (3, 4, 5), at least one (3) of which contains a phase mixture ofβ-brass and/orβ′-brass andγ-brass. In said at least one coating layer (3) containingβ-brass and/orβ′-brass andγ-brass, theβ-phase and/orβ′-phase and theγ-phase are arranged next to each other in a fine-grained structure in which the mean size of theβ-brass and/orβ′-brass grains and theγ-brass grains amounts to a maximum of 5μm relative to the cross-section extending perpendicular to the longitudinal axis of the wire electrode (1, 1′). In order to produce the wire electrode (1, 1′), a wire is used that has a coating layer predominantly containingγ-brass, and a homogenizing step is carried out in which theγ-brass is substantially transformed into aβ-brass having a minimum zinc concentration of 51 percent by weight at temperatures exceeding 600° C., and the wire (1, 1′) is finally cooled, a process during which zones ofγ-brass are separated from the supersaturated solid solution ofβ-brass.
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