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对不同挤压工艺下Mg2B2O5w/AZ63B棒材的热挤压过程进行了有限元模拟,分析了热挤压过程中挤压温度(250、300、350℃)、挤压速度(1、4mm/s)和挤压比(6.25、14.00、20.25)对Mg2B2O5w/AZ63B复合材料挤压过程中等效应力的影响。模拟结果表明,温度对等效应力的影响最为显著,当挤压温度由250℃升至350℃时,合金的最大等效应力由185MPa降低到138MPa;当温度与挤压比恒定时,挤压速度从1mm/s增大到4mm/s时,最大等效应力值从184MPa降低到167 MPa;随着挤压比的增大,坯料在挤压筒内的等效应力逐渐增大,挤压坯料在挤压模具锥角处受到强烈的挤压变形和剪切变形,晶粒得到细化,使得等效应力的分布更加均匀。
The hot extrusion process of Mg2B2O5w / AZ63B bar under different extrusion process was simulated by finite element method. The extrusion temperature (250,300,350 ℃), extrusion speed (1,4mm / s ) And extrusion ratio (6.25, 14.00, 20.25) on the equivalent stress in the extrusion process of Mg2B2O5w / AZ63B composites. The simulation results show that the temperature has the most significant effect on the equivalent stress. When the extrusion temperature is raised from 250 ℃ to 350 ℃, the maximum equivalent stress of the alloy is reduced from 185MPa to 138MPa. When the temperature and extrusion ratio are constant, When the velocity increases from 1mm / s to 4mm / s, the maximum equivalent stress decreases from 184MPa to 167MPa. With the increase of extrusion ratio, the equivalent stress of blank in the extrusion cylinder increases gradually, The billet is subjected to strong extrusion deformation and shear deformation at the corner of extrusion die. The grains are refined and the distribution of equivalent stress is more uniform.