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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 tubing was simulated by Deform-3D software. The influence of extrusion ratio on the hydrostatic extrusion process was analyzed in detail. The results show that the extrusion load increases with the extrusion ratio. When the extrusion ratio increases from 1.75 to 2.22, the peak pressure increases from 306 MPa to 375 MPa, an increase of 22.5%. The greater the extrusion ratio, the more severe the shear deformation of the material, which is more beneficial to the grain refinement of the material. The larger, the greater the difference between the flow velocity inside and outside the pipe, and the inner wall velocity difference is too large, easily lead to pipe cracking. Selection of extrusion ratio of 1.88, in the 40 MN horizontal hydrostatic extrusion machine to achieve large-diameter AZ80 magnesium alloy pipe extrusion, pipe surface quality is good, uniform wall thickness without defects.