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1.绪言以前用球铁制造大型铸件,只限于形状比较简单,或壁厚变化小的另件。可是现在,本公司与法国热机协会协作铸造的PA-6V型12缸柴油机曲轴箱,形状非常复杂,壁厚变化大(15～100毫米),毛坯重量达8200公斤。因此,在铸造方案、配料等方面采取了前所未有的慎重态度。经过多方面研究,铸造了1～3号曲轴箱得到的结果比予想的还好。为今后用球铁铸造复杂结构件提供参考,现将研究经过介绍如下(图1)。
1. INTRODUCTION In the past, large-scale castings made of ductile iron were used only for those with simple shapes or small variations in wall thickness. Now, however, the shape of the PA-6V 12-cylinder diesel engine crankcase, co-produced by the Company and the French Heat Engine Association, is very complex in shape and varies in wall thickness (15-100 mm) with a stock weight of 8,200 kg. Therefore, in casting programs, ingredients and so took an unprecedented cautious attitude. After many studies, foundry crankshaft No. 1 to 3 results are better than expected. For the future with ductile iron casting complex structures provide a reference, the study is described below (Figure 1).