Combined laser-electric spark-electrolysis machining method and device for micro holes with countersunk heads

The invention relates to a combined laser-electric spark-electrolysis machining method and device for micro holes with countersunk heads. The method comprises the steps: carrying out through hole pre-machining on the micro holes with the countersunk heads on a workpiece through a laser beam, carrying out electric spark machining on the countersunk heads of the micro holes through a tubular copper electrode to achieve needed precision of the shape of the countersunk heads basically, and carrying out electrolytic machining electrolysis machining on the whole micro holes with the countersunk heads through a high-speed jet electrolyte beam coaxial with the electric spark machining electrode to remove recast layers remaining after the former two machining steps. The device comprises a laser generation device, a combined electric spark machining and electrolysis machining device, a machining mode conversion device, a working solution circulation system, a power supply and a control system. According to the method, laser machining and electric spark machining are the main machining modes and supplemented by electrolysis machining, and the high speed, high precision and high quality can be achieved at the same time. By means of the method and device, rapid machining of the micro holes with the various special-shaped countersunk heads can be achieved, and various shortcomings caused by the adoption of a single specific machining mode in the prior art can be overcome.