【摘要】 在获得不同变形温度和应变速率下2519铝合金的压缩真应力-应变曲线的基础上,采用DEFORM-2D软件对2519铝合金管材的热挤压成形过程进行了数值模拟,获得了在挤压不同阶段中变形材料的应力、应变和温度场的分布及挤压力的变化规律。结果表明:挤压力模拟值与经验公式计算值相差约10%,模拟结果与计算结果较接近;生产中应严格控制该合金的挤压速率(<5 mm.s-1),以防止产生过烧现象。更多还原

【Abstract】 On the basis of obtained true flow stress-true strain curves of 2519 aluminum alloy at different temperatures and strain rates,the hot extrusion processes of 2519 aluminum alloy tubes were simulated by using DEFORM 2D software.Stress field,strain field,temperature field and variation laws of the extrusion load for this material were obtained at different stages in the extrusion process.The results showe that the relative deviation between the simulated value of extrusion load and the calculated value from empirical formula is about 10%,so simulation result is close to the calculated result.The extrusion velocity must be strictly controlled to prevent overheating structure.更多还原