AZ80镁合金扩管静液挤压成形的数值模拟与试验  

Numerical Simulation and Experiment of Tube-expanding Hydrostatic Extrusion Forming of AZ80 Magnesium Alloy

作　　者：黄宣彬 吴志林[1] 袁人枢[1] 蔡红明[1] 赵孟军[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《热加工工艺》2017年第11期102-106,共5页Hot Working Technology

基　　金：国家科技重大专项项目(2012ZX04010101)

摘　　要：运用Deform-3D软件对AZ80镁合金管材静液挤压工艺进行了数值模拟,详细分析了挤压比对静液挤压成形过程的影响。结果表明,挤压载荷随着挤压比的增大而增大。挤压比由1.75增加至2.22时,峰值压力由306 MPa增加至375 MPa,增幅为22.5%;挤压比越大,材料剪切变形越严重,对材料晶粒细化更加有利,管材流出速度越大,管材内外壁流速差越大,而内外壁流速差太大容易造成管材开裂。选用挤压比为1.88,在40 MN卧式静液挤压机上顺利实现大口径AZ80镁合金管材的挤压成形,管材表面质量良好,壁厚均匀无缺陷。The hydrostatic extrusion process of AZ80 magnesium alloy tube was simulated by using Deform-3D software. The effect of extrusion ratio on the forming process of the hydrostatic extrusion was analyzed in detail. The results show that the extrusion load increases with the increase of the extrusion ratio. When the extrusion ratio increases from 1.75 to 2.22, the peak pressure increases from 306 MPa to 375 MPa, and the amplification is 22.5%.The larger the extrusion ratio is, the more severe the shear deformation of the material is, the more favorable the grain refinement of the material is, the greater the pipe flow rate is, and the greater the flow rate difference between the internal and external walls is. Too large internal and external wall flow rate difference is easy to cause pipe cracking. Choosing the extrusion ratio of 1.88, the large diameter AZ80 magnesium alloy tube is successfully fabricated in the 40 MN horizontal hydrostatic extrusion machine. The surface quality of the tube is good, the wall thickness is uniform and there is no obvious defect.

关 键 词：数值模拟 镁合金 静液挤压 挤压比 

分 类 号：TG376.9[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]