The study and determination of causes of fracture of the shaft of the roll working the wire cassette unit

In the process of the design of the machine, lath or unit the foundations of durability and reliability of individual components and parts are established. In the manufacture a great influence on the quality and performance of parts have technological factors. The reliability and durability of the most loaded mated parts, working parts of the machine depend largely on the correctness of the choice of the manufacturing method, the purpose of the appropriate hardening metal processing, the quality of the Assembly.

Part shaft is present in any mechanism and plays an important role in ensuring of the functional performance of units and assemblies. During operation, the shafts are subjected to operating loads, resulting in defects. The diversity and complexity of modern structures, their operating conditions, methods of production and hardening of parts makes the technical diagnosis of the causes of destruction a very difficult task, which in some cases can be solved only with the help of a complex of modern physical methods of research, including fractography and microscopy.

The article deals with the causes of destruction of the roll shaft of the working cassette of the wire block. On the basis of the fracture analysis, the main classification features are established: orientation, microgeometry, degree of plastic deformation at fracture and fracture energy, micromechanism of fracture. The fracture surface has a fine-grained fracture (formed under conditions of small plastic deformation) and is characterized by the presence of shiny flat areas on the fracture surface

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