An analysis of the state of the matter of the manufacture of parts such as bodies of revolution has shown that there is a problem of turning processing by turning large, long parts, connected with increasing productivity and processing quality, as well as reducing the costs of turning operations. To solve this problem, the authors propose a resource-saving combined method for treating external cylindrical surfaces by thermal friction turn-milling. Experimental studies were performed on the processing of the outer cylindrical surface using a special friction cutter made of non-instrumental material. The results showed that with thermal friction turn-milling, it is possible to achieve Ra = 1,0 mcm. The process of chip formation was also investigated and the formation of a retarded layer was established, which protects the surface of the friction cutter from wear. Optimum values of cutting conditions for processing by thermal friction turn-milling of steel 30HGSA.
The authors carry out research on the development of technology for the manufacture of concrete products using non-dimensional waste of reinforcing bars, plain bars and wire rods. The studies carried out in the conditions of construction enterprises of the Republic of Kazakhstan, in particular the Karaganda region, have shown that this technology is advisable to use in the manufacture of concrete products such as bar lintels. As a result of the research carried out, a construction of a bar lintel was established, which is made of a concrete mixture with the addition of man-triggered waste and a space frame, reinforcing bars of which are welded from non-dimensional segments of reinforcement. This article presents the results of testing samples of reinforcing bars connected by friction welding and modeling the static tensile testing process with the determination of the tensile strength depending on the loads. At various loads, the stress on the surface of the reinforcing bar is less than 600 MPa, which corresponds to regulatory documents. At the same time, the maximum stresses are formed in the base metal, yet there is the least tension in welded seam. The test results showed the possibility of using welded reinforcing bars from non-dimensional segments of reinforcement in the manufacture of concrete products, in particular bar lintels.
As a result of research, it was revealed that there is a problem of turning accurate large-sized, long parts, which is associated with an increase in productivity and quality of processing, as well as with a decrease in the cost of turning operations. To solve this problem, the authors developed a method of thermo-friction turn-milling and tool design. However, the lack of knowledge of the thermal phenomena occurring in the contact layer “blank-tool” during processing inhibits the widespread use of the proposed method. In this regard, this article simulated the thermal state of the surface layer during cutting. The results of modeling the thermal state of the surface layer when processing parts from difficult materials with thermofriction turn-milling are presented. The influence of cutting conditions and geometric parameters of the tool on the distribution of the temperature field of the surface layer of the workpiece during thermo-friction turn-milling is considered.
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