In recent years, attention has been being paid to global environmental problems, and even higher fatigue strength is required for crankshafts used in medium-speed diesel engines for onshore power generation. Surface treatment technology is drawing attention as one of the means to achieve this. In any of the surface treatment technologies, however, a tensile residual stress, which causes a decrease in fatigue strength, occurs at the boundary between the surface treated part and the untreated part, and it is necessary to understand the residual stress distribution around the surface treated part. This paper describes the evaluation of the influence of the macro-segregation peculiar to large, forged steel, and the X-ray incident angle and incident angle setting error, generated during fillet measurement, on the accuracy of X-ray stress measurement by the cos α method. Improvement measures are also described. In addition, the effectiveness of a system that can automatically and high-speed measure the residual stress in the cold rolled fillet has been demonstrated.
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Kobelco - Kobe Steel Ltd. published this content on 26 November 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 26 November 2021 04:39:02 UTC.
Kobe Steel, Ltd. specializes in manufacturing and marketing of steel and metallurgical products. The group is also developing production of construction and industrial machines activity. Net sales break down by activity as follows:
- sale of steel and aluminum products (42.3%): special steel wires, stainless tubes, rolled steel products, steel strips, aluminum plates and sheets, aluminum alloy products, building materials, etc.;
- manufacturing of construction machines (17.8%): cranes, hydraulic excavators, mini excavators and wheeled loaders;
- sales of advanced materials (15.6%): copper foil for semiconductors, copper tubes for air conditioners, aluminum extrusions, aluminum alloy products, iron powder, etc.;
- manufacturing of industrial machines (7.8%): compressors, high pressure machines, heat pumps, nuclear plants equipments, etc.;
- engineering services (6.4%);
- electric power production (5.3%);
- sale of welding materials and equipments (3.6%);
- other (1.2%): primarily sale of electronic equipments and real estate development.