Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying

Abstract

The article discusses the main types of installations (HVOF / HVAF (High Velocity Oxy / Air-Fuel), the Russian analogue of which is HPS/SGV (gas-flame supersonic/supersonic gas-air, activated arc metallization ADM devices) and the use of high-speed gas-flame technology for surface hardening for machine parts. Here we considered all types of flame treatment (welding, oxyfuel cutting, brazing, surface hardening, flame straightening, metallization, welding and spraying of non-metals), the performance of various methods of thermal spraying (GTN), and also considered the properties, methods of production and use of gases used in flame processing, modern equipment and equipment for all considered processes. The main task of the coating obtained by the method of flame spraying is also considered. It is shown that the deposition of coatings by the method of high-speed gas-flame spraying and effective materials for protection is promising. In addition, safety precautions for gas-flame processing are considered. The state is analyzed that the abrasive wear resistance of steel is a structurally sensitive characteristic, therefore, an effective wear-resistant material must have the ability to harden under the influence of working loads, during operation, and from this, materials are effective materials for protection under abrasive wear; corresponding to the principle of metastable austenite. The characteristics of a heterophase jet obtained under optimal spraying modes are estimated on the basis of a calculation using a mathematical model of a two-phase flow.