Preparation of the Surface of Long-Dimensional Rods of Hydro-Cylinders for Thermal Spraying Using an Abrasive Jet

Abstract

Preliminary cleaning of the surface of hydraulic cylinder rods is of great importance for subsequent coating. The most widely used surface preparation for thermal spraying is jet-abrasive treatment. The shot blast modes provide the hardness and strength of the material being processed. The impact of the abrasive makes the surface rough, increasing the contact area. Experimental studies of jet-abrasive processing of the hydraulic cylinder rod surface, as well as its activation for the thermal spraying, were carried out. The prepared surface of the rod for thermal spraying must meet the requirements for surface roughness and the size of the hardened layer at work. The experiments made it possible to identify the optimal modes of jet-abrasive treatment, which affect surface roughness and abrasive penetration of abrasive. To obtain the desired roughness values, it is preferable to use the following: a steel shot with an abrasive particle size in the range of 0.3–1.5 mm, taking the compressed air pressure in the range of 0.4–0.7 MPa; processing time—within 3.5–5 min; counterflow angle with the surface—70–90°; consumption of abrasive particles—300–500 kg/h. A special installation for jet-abrasive processing has been designed, which makes it possible to restore the surfaces of long rods by thermal spraying directly at the site of operation of the large machines.

A Comparative Analysis of the Dynamic Strength Properties of the Long Guides of Intelligent Machines for a New Method of the Thermal Spraying of Polymer Concrete

“…A carriage 10 is installed on rails 2, to which a modular burner 11 and an oxy-acetylene burner 12 are attached. The burners are fastened by holders mounted on a rack with The essence of the process of modeling gas-thermal coatings consisted in the formation of a directed flow of dispersed particles of the sprayed material [23], which ensures their transfer to the surface of the frame generatrix and the formation of a special coating layer on the guides (Figure 5a) under the appropriate modes (Table 2). The gas-flame installation in Figure 5b consists of a frame 1 assembled from aluminum profiles, on which a belt-driven spindle 4 and guide rails 2 and 3 are installed as well as self-made carriage 7, which was also assembled from rails 2 and ball guides 5.…”