Choice justification of material for the geohod blades working body manufacture

Introduction. The use of geohods for the development of underground space is an innovative approach, the essence of which is the use of geo-media in the rock mass to create traction forces. The constructive and functional requirements for the working bodies are being developed, which take into account the nature of the movement and functionally constructive differences, the formation of a specific form of slaughter obtained during the operation of the working body, in which the working body is made in the form of helicoids shape. To implement technological solutions, it is necessary to select and justify the materials of the working body of the geohod. Materials and methods. The paper considers the basic requirements for the materials of the working body of the geohod, based on the structural, functional and technological features of the design of the geohod. The paper notes that the cutting edge of the working works in particularly harsh conditions, therefore, materials such as alloy steels with high wear resistance are recommended for this type of construction. Foundry alloy steels and high-strength alloy alloys are considered as rational options. Research results and their discussions. Taking into account the features of the equipment, the physical and mechanical properties of the rock being destroyed, the strength characteristics of the recommended materials and their technological properties, when choosing materials, emphasis is placed on the mechanical properties of materials and wear-resistant properties, which are important parameters, since abrasive wear of the working surfaces occurs when the working body of the geohod. Conclusion. The recommended alloyed alloys with high strength meet all the requirements that are imposed on the design of the knife of the executive body, but do not meet the technological requirements, namely, they are quite difficult to deform, difficult to process by cutting and welded. Considering all the technological properties that are significant in the implementation of the manufacturing technology of the working body of the geohod, it is recommended to choose more durable materials that withstand large continuous loads. Resume. The article presents the results of research to determine the choice of material for the manufacture of the working body of the geohod. It is established that for the manufacture of the working body, when using the casting technology of production, steel 30ХГСА can be used, when processing pressures – steel 18Х2Н4МА. Suggestions for practical application and direction of future research may be useful for the development of manufacturing technology of the main elements of the working body of the geohod.