Electric pulse assisting hot extrusion forming device and forming method

Abstract

The invention discloses an electric pulse assisting hot extrusion forming device and forming method. According to the electric pulse assisting hot extrusion forming device, temperature, pressure and pulse currents are adopted for acting on a metal blank together, and extrusion plastic deformation happens to the metal blank. Compared with an existing hot extrusion forming device, the electric pulseassisting hot extrusion forming device can reduce forming pressure, reduce wear of an extrusion mold and reduce the requirement for equipment tonnages. Grains of an extrusion profile are refined, second-phase precipitates are finer and are distributed dispersedly, and the mechanical performance and surface smoothness of the extrusion profile are improved. According to the electric pulse assisting hot extrusion forming method, proper temperature parameters, extrusion speed parameters and electric pulse parameters are selected, and therefore the forming pressure can be obviously reduced, the grains can be refined, and the product quality can be improved.

Description

technical field [0001] The invention relates to the field of metal hot extrusion forming, in particular to an electric pulse assisted hot extrusion forming device and forming method. Background technique [0002] Extrusion forming is an important forming technology in the field of plastic processing. It applies strong pressure to the metal billet placed in the die cavity (or extrusion cylinder) to force the metal billet to produce directional plastic deformation. A plastic processing method for parts or semi-finished products that are extruded in a die hole to obtain the desired cross-sectional shape, size and certain mechanical properties. According to the microscopic mechanism of metal plastic deformation, the essence of plastic deformation is the generation and movement of a large number of dislocations. Due to the movement and interaction of dislocations, entanglement of dislocations and dislocations will be generated during plastic deformation at room temperature. Phen...

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Problems solved by technology

[0004] Magnesium alloy has a close-packed hexagonal lattice structure. At room temperature, only the {0001} basal plane slips, and as the temperature rises, the {10-10} and {10-12} cones slip successively, and the plasticity is improved to a certain extent. In addition, , magnesium alloy materials have poor fluidity, narrow deformation temperature range, and are very sensitive to factors such as extrusion speed and extrusion temperature. Improper control can easily cause problems such as cracking, oxidation, and burning of extruded profiles. A strong {0001} basal texture will be produced during the hot extrusion process, which will seriously reduce the formability of magnesium alloys and aggravate the anisotropy of magnesium alloy profiles, because the extrusion of magnesium alloys is very difficult , so it is necessary to design and develop high-quality and efficient extrusion forming technology suitable for magnesium alloy profiles according to the plastic deformation characteristics of magnesium alloys

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