The authors conduct research on the creation of non-waste technology for the use of reinforcing bars in the manufacture of reinforced concrete products (reinforced concrete). This article presents the results of a study of existing methods for connecting reinforcing bars in the manufacture of reinforced concrete. The connection methods were investigated: mechanical, lap welded. Their advantages and disadvantages are revealed. Welding methods have also been investigated: contact, bathroom docking, contact spot, friction welding. The following main disadvantages inherent in existing methods of connecting reinforcing bars were established: the narrowness of technological capabilities, low quality and accuracy of the connection, the high cost of technological equipment. To address these shortcomings, a new method of friction welding for connecting reinforcing bars is proposed.
This paper deals with hole-enlarging multi-ute drilling process. In this respect, the analysis of existing structures, their advantages and disadvantages is carried out and investigated. Cutting conditions during hole-enlarging multi-ute drilling process are shown. Herein, a new design of a hole-enlarging multi-ute drilling, as a holeenlarging multi-ute drill-broaching tool from broaching-speed steel with carbide plates, and a new way of handling new tools are presented. Hole-enlarging multi-ute drillbroaching combines the features of hole-enlarging multi ute drill (in cross-section) and those of broaching tool (in longitudinal section). In so doing, it is possible to increase the quality of hole-making (size variance, surface roughness) to facilitate cutting conditions and increase durability. The results of prototypes testing are presented in the end.
This article presents the experimental study results of the process of rotational friction holes boring using a cup cutter surfaced by STOODY M7-G material. As a result of experimental studies, the following quality indicators were achieved: surface roughness within Ra=10÷1,25 micrometer; surface hardness within HB 212-248. Using a cup cutter surfaced by STOODY M7-G material in case of rotational friction boring of large-diameter holes for large-sized parts can improve processing performance in comparison with cutting tools equipped with hard metal plates and provided the required surface roughness. Preliminary calculations showed that the manufacture of cup cutters from non-instrumental materials reduces the cost of the cutting tool by 5-7 times and the cost of the operation by 1.5-2 times.
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