凡晓波

个人信息Personal Information

研究员

博士生导师

硕士生导师

性别:男

毕业院校:哈尔滨工业大学

学位:博士

所在单位:机械工程学院

学科:机械制造及其自动化. 材料加工工程

办公地点:机械楼8055室

电子邮箱:xbfan@dlut.edu.cn

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Deformation and strengthening analysis of Al-Mg-Si alloy sheet during hot with die

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论文类型:期刊论文

发表时间:2020-09-01

发表刊物:JOURNAL OF MANUFACTURING PROCESSES

收录刊物:SCIE

卷号:57

页面范围:452-461

ISSN号:1526-6125

关键字:Al-Mg-Si alloy; Hot gas forming; Die quenching; Deformation; Strengthening

摘要:Hot gas forming with synchronous die quenching is proposed to form aluminum alloy complex-shaped components. The effects of heating temperature (400-520 degrees C), gas pressure (1-10 MPa) and gas intake methods on the deformation behaviors of a heat treatable Al-Mg-Si alloy sheet were analysed. The temperature fields were measured to reveal the formation mechanism of defects. The final strength distributions were clarified by hardness and tensile tests to evaluate the strengthening effect of die quenching. It is found that the excellent bulging ability exhibits in the integrated process, a double-stepped box specimen with a maximum strain of 0.64 and dimensional deviation less than 0.2 mm can be formed by collaboratively controlling the closing and pressurizing processes. The heating temperature should be higher than 500 degrees C to avoid rupture. A gas pressure of higher than 7.5 MPa is needed to ensure full filling. The gas intake should occur in the areas with a small deformation or no deformation to avoid the effect of decreasing temperature on deformation. A sufficient cooling ability (cooling rate being above 50 degrees C/sec) by die quenching ensures the strengthening level in T6 temper of this material. It is a huge potential to form complex-shaped components with full strength and high dimensional accuracy by hot gas forming with synchronous cold-die quenching.