The article discusses causes and eliminated measures of aluminium alloy die forgings crassitude crystal from four sides of component, technical parameter, temper of die and heat treatment.
从锻件的材质、锻造工艺参数、锻模温度、热处理工艺参数四个方面，阐述了铝合金模锻件粗晶缺陷的产生原因及消除措施。
Results: umbilical cord mild infection rate is related with the cut of umbilical cord with residual, the high ligation of the umbilical cord and the umbilical cord with congenital crassitude.
结果：脐带轻度感染率与脐带残留未剪净、脐带高位结扎、脐带先天粗大密切相关。
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