The invention discloses a method for manufacturing a gradient
composite electrode for electrical spark rough
machining and electrical spark finish
machining for
laser solid forming and belongs to the technical field of
electric discharge machining. The method comprises the steps that a three-dimensional
solid model is generated by means of
software, the model is sliced and layered, and the parameters of all slice
layers are obtained; then, Cu-based SiC composite micro
powder is sintered on a vibrating substrate by means of
laser according to the shape parameter of the slice layer on the inner side; finally, Cu
powder and
graphite powder are sintered on a Cu-based SiC composite
sediment layer in a mixing mode by means of
laser according to the shape parameter of the slice layer on the outer side. The
electrode manufactured through the method is provided with a gradient structure, and
electricity is discharged firstly by the Cu-based
graphite sediment layer located on the outer layer of the
electrode so as to achieve rough machining of a workpiece; then finish machining of the workpiece is achieved by means of the Cu-based SiC composite
sediment layer of the
electrode. Meanwhile, the Cu-based SiC composite micro powder is formed by blowing SiC particles in molten Cu in a dispersed mode by means of
nitrogen and then conducting atomization and cooling, in this way, the
distribution uniformity of the SiC particles is improved, and the equilibrium of the electric
corrosion resistance of the electrode is improved.