Improving the durability of roadconstructionmachines based on improved repair of friction knots

The article discusses the issues of increasing the durability of road-building machines. As a subject of research, friction units are considered, the details of which are made of gray iron. On the basis of a comprehensive technical and economic analysis of hardening methods for cast iron parts, it was established that chemical-heat treatment has the best combination of criteria. The methods used in practice for hardening cast irons are of little use in the conditions of repair production due to the complexity of technological processes and equipment. In addition, the thickness of the hardened layer usually does not exceed 0.3 mm. The paper discusses the main aspects of the application of new technology of surface hardening, formulated recommendations for its use, depending on the service purpose details. An assessment of the technical level of the proposed solutions compared with traditional technologies of hardening of cast iron.