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Along with the recent expansion to overseas markets by Japanese automobile manufacturers, an increasing number of production bases for crankshafts are being built in many areas worldwide. Under these circumstances, the capacities and functions required for crank forging lines have been diversified, such as the ability to forge various products at high speed, the ability to forge products other than crankshafts, and the ability to forge limited-production items in a small space. Over the last 3 years, Sumitomo Heavy Industries Techno-Fort Co., Ltd. has manufactured 11 crankshaft-forging press lines of different kinds in response to such demands. The features of the supplied lines are 1) the main press with the capacity of 45000kN to 65000kN, 2) the productivity of maximum 600 pieces per hour and 3) the in-line twister and coining presses, which are designed suited to each production condition. This report explains the representative examples of the latest crankshaft forging lines and the new elemental technologies adopted for them.
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