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基于Deform有限元分析软件,选择Cokcroft&Latham韧性断裂准则,研究了成形温度400℃时不同挤压速度(0.5、1、2mm/s)、不同摩擦系数(0.1、0.15、0.2)与不同模具形状(半圆形通道、单锥形通道、双锥形通道)下2A12铝合金杯状件环形通道挤压工件的成形损伤规律。并且以单锥形通道为例,研究了坯料高径比对挤压工件成形损伤的影响。结果表明:挤压工件最大成形损伤值随着挤压速度的增大而减小,随着摩擦系数的增大而增大;当挤压速度、摩擦系数相同时,半圆形通道模具挤压的工件损伤值较大、双锥形通道模具损伤值较小。
Based on the Deform finite element analysis software, the Cokcroft & Latham toughness fracture criterion was selected. The effects of different extrusion rates (0.5,1,2 mm / s), different friction coefficients (0.1,0.15,0.2) and different mold shapes Circular channel, single conical channel, double conical channel) 2A12 aluminum alloy cup annular channel extrusion workpiece forming damage rules. Taking a single tapered channel as an example, the effect of billet height-diameter ratio on the forming damage of the extruded workpiece was studied. The results show that the maximum damage value of the extruded workpiece decreases with the increase of the extrusion rate and increases with the increase of the friction coefficient. When the extrusion speed and the friction coefficient are the same, the semicircular channel die extrusion The damage value of the workpiece is larger, the double conical channel mold damage value is smaller.