自1973年 Frank 首次提出耳皱在动脉硬化诊断中的意义以来,有关的研究认为耳皱对冠心病诊断有一定意义,有人称其为'冠心耳纹',但亦有持相反意见者。本文就55例冠脉造影结果,对确诊为冠心病的40例及排除冠心病的15例进行耳皱观察...自1973年 Frank 首次提出耳皱在动脉硬化诊断中的意义以来,有关的研究认为耳皱对冠心病诊断有一定意义,有人称其为'冠心耳纹',但亦有持相反意见者。本文就55例冠脉造影结果,对确诊为冠心病的40例及排除冠心病的15例进行耳皱观察,对其在冠心病诊断中的意义进行探讨。展开更多
To study the influence of blank holder type on the drawability of 5182-O aluminum sheet at room temperature, the flat blank holder and curved blank holder were employed during the deep drawing process. The microstruct...To study the influence of blank holder type on the drawability of 5182-O aluminum sheet at room temperature, the flat blank holder and curved blank holder were employed during the deep drawing process. The microstructures were characterized by optical microscopy （OM）. The results reveal that the limiting drawing ratio （LDR） of 5182-O aluminum alloy sheet is 1.7 using the flat blank holder. The drawn cup have severe earring. Compared with using flat blank holder, the LDR of 5182-O aluminum alloy sheet is enhanced to 2.0 using curved blank holder. In addition, the earring ratio also reduces and flange wrinkling is prevented when the curved blank holder is used. These are due to a more uniform sheet flow in different directions with curved blank holder.展开更多
基金Project(CDJZR14130009)supported by the Fundamental Research Funds for the Central Universities,China
文摘To study the influence of blank holder type on the drawability of 5182-O aluminum sheet at room temperature, the flat blank holder and curved blank holder were employed during the deep drawing process. The microstructures were characterized by optical microscopy （OM）. The results reveal that the limiting drawing ratio （LDR） of 5182-O aluminum alloy sheet is 1.7 using the flat blank holder. The drawn cup have severe earring. Compared with using flat blank holder, the LDR of 5182-O aluminum alloy sheet is enhanced to 2.0 using curved blank holder. In addition, the earring ratio also reduces and flange wrinkling is prevented when the curved blank holder is used. These are due to a more uniform sheet flow in different directions with curved blank holder.
