Pashkova G. Serviceability Increase of Cast Iron Crankshafts of Powerful Transport Diesel Engines by Combined Strengthening

Object of research: of cast iron crankshafts of powerful transport diesel and processes of their thermal and mechanical hardening. The purpose of research: serviceability increase of cast iron crankshafts of powerful transport diesel engines by combined strengthening basing a combination of local thermal processing with the subsequent superficial plastic deformation. Methods of research that and the equipment: metallographic, X-ray structure, electronic microscopy. Definition of characteristics of wear resistance, resistance of weariness and an intense condition by laboratory and operational tests. Modern microscopes, solid-meter and diffraction-meter are used. Theoretical and practical results: new ways of the combined hardening of pig-iron cranked shaft of the powerful transport diesel engines, providing increase of their serviceability in 1,5-2 times. Novelty: use of the combined ways of hardening for increase of serviceability of cast iron cranked shaft of powerful transport diesel engines is offered; dependences of characteristics of wear resistance and resistance of weariness on a structural - phase condition, distribution of hardness and a level of the residual pressure generated during combined hardening are established; laws of formation of a level of residual pressure in cranked shaft are revealed; principles of a choice of optimum circuit of superficial plastic deformation by roller spinning of large cranked shaft. Degree of introduction: it is introduced into manufacture on the state enterprise "The Malyshev Plant", Kharkov. Area of use: a diesel engine - and the machine-building enterprises.