Machining method for three-dimensional open flow channel using high-speed arc discharge layered sweep

A machining method for a three-dimensional open flow channel using high-speed arc discharge layered sweep, comprising

• providing a tool electrode comprising an installation shaft with an axial line and a plurality of flushing holes at bottom surface of the tool electrode, wherein the tool electrode moves in six degrees of freedom comprising linear movement in X, Y, and Z directions and rotational movement in A, B, and C axes around the X, Y, Z directions, respectively,
• disposing the tool electrode on a main shaft of a machine tool and a work piece comprising an axial line on a rotary table of the machine tool,
• arranging the axial line of the installation shaft of the tool electrode to be perpendicular to the axial line of the work piece, wherein the flushing holes at the bottom surface of the tool electrode are on a side perpendicular facing the axial line of the work piece,
• forming a flushing circuit in a water-based working fluid in a water tank by the flushing holes at the bottom surface of the tool electrode and a water trough in the water tank,
• respectively connecting the work piece and the tool electrode to two poles of a power source to form a discharging circuit in the water-based working fluid, wherein the water-base working fluid between the work piece and the tool electrode is a discharging medium that breaks down to form a discharging arc for material removal and surface machining of a three-dimensional open flow channel, and hydrodynamic arc breaking by the water-based working fluid as the discharging medium for flushing between the tool electrode and the work piece combines with pulsed electrical arc breaking,
• feed driving the tool electrode along the X, Y, Z directions, and subsequently sweeping in small movement in a closed path in a plane or a curved surface perpendicular to the axial line of the installation shaft of the tool electrode, wherein the path of sweeping satisfies that moving the tool electrode in the path of sweeping and being coincident with removal of portion of the work piece forms an enveloped space that does not exceed a preset size of the machined cavity of the flow channel, and
• performing layered sweeping machining of multiple layers of a single flow channel to form the three-dimensional open flow channel.