Electrically assisted forming process and device for high-strength metal alloy thin-walled pipe

An electrically assisted forming process for a metal alloy thin-walled pipe, comprising:

• selecting drawing dies with corresponding hole diameters in sequence, according to an outer diameter Φ0 of a metal alloy pipe to be drawn and an outer diameter Φtarget of a target metal alloy pipe;
• placing low-melting-point metal filler into the metal alloy pipe to be drawn, wherein the low-melting-point metal filler is in clearance fit with the metal alloy pipe to be drawn, and a gap between the low-melting point metal filler and the metal alloy pipe to be drawn is filled with graphite powder;
• turning on a pulse power supply with predetermined current magnitude, duty cycle, and frequency;
• feeding the metal alloy pipe to be drawn into the drawing dies;
• driving, by a horizontal rightward pulling force, the metal alloy pipe to be drawn to be conveyed from left and right at constant speed such that the metal alloy pipe experiences an electroplastic drawing, a cooling device being arranged between every two passes;
• turning off the pulse power supply after drawing is completed to obtain a metal alloy thin-walled pipe;
• and
• cutting, from the metal alloy thin-walled pipe, a thin-walled pipe segment with corresponding length as required after the drawing is completed, and vertically placing the thin-wall pipe segment in a vacuum heat treatment furnace for annealing treatment, during which the low-melting-point metal filler in the thin-walled pipe segment is melted and flows into a groove of a vacuum heat treatment furnace under an action of gravity, for recycling and a target metal alloy thin-walled pipe is obtained.