日本制钢所采用了近净形铸钢技术和热轧铸造技术制造了长25米重400吨的大型船用柴油发动机的曲轴,并取得高质量、高效益的成果。现将其作法摘要介绍如下:一、船用曲轴曲轴是柴油发动机直接与螺旋浆轴联结而传递推进力的。船用柴油发动机曲轴的制造方法,大体上有二种,一是整体制造的曲轴,主要用于中小船舶和发电用中、高速的冲程的柴油 Japan’s steel used nearly net-shaped steel casting technology and hot-rolled casting technology to create a 25-meter long and 400 tons of large marine diesel engine crankshaft, and achieved high-quality, cost-effective results. Now the summary of their practices are as follows: First, the marine crankshaft Crankshaft is a diesel engine directly connected with the propeller shaft to transmit propulsion. Marine diesel engine crankshaft manufacturing methods, there are generally two kinds, one is the overall manufacture of crankshaft, mainly for small and medium ships and power generation with high-speed stroke diesel