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一、铸件产量的变化 1965年以来,日本不同材质铸件产量的变化如图1所示。图中总产量纵座标为其原来的60％。由图可知,到1971年止,灰铸铁产量约占总产量的60%,以后逐年下降,最近仅为50％。这是由于连续铸造比例上升,钢锭模的需要量大大减少和球铁及其它的金属材料取代了部分灰铸件之故。在过去20年间球铁和铸造铝合金得到了显著发展,灰铁、铸钢、可锻铸铁等生产有较大的起伏。
First, changes in casting production Since 1965, Japan, casting changes in different materials as shown in Figure 1. The figure of the vertical axis of the total output of 60% of its original. As can be seen from the figure, by 1971, the output of gray cast iron accounted for about 60% of the total output, and then declined year by year, only 50% recently. This is due to the continuous casting ratio increases, the need for ingot mold greatly reduced and ductile iron and other metal materials to replace part of the gray castings so it. In the past 20 years ductile iron and foundry aluminum alloy has been significantly developed, gray iron, steel, malleable iron and other production have greater ups and downs.