Comparative Analysis of Technologies for Machining of Large-Sized Propellers in Specialized Screw-Cutting Production
The main goal of the research is to reduce the time and in-process costs of machining, tools and rigging of propellers by introducing modern machining centers with numerical program control. The article presents a comparative analysis of the existing and promising technologies, taking into account the renewal of the machine tools park for the specialized screw-cutting production of JSC “Zvezdochka”. The network graphs for several possible technology options are given, taking into account the scheme for fixing the workpiece on the machine, for which the results of calculations of the technological complexity, the tool and equipment costs are presented. The experimental operational technology is proposed, the feature of which is the maximum concentration of operations within the same technological system of the Skoda FCW150 machine, which allows excluding a number of operations. The introduction of this technology will reduce the total labor intensity of machining by 23 %, the cost of equipment due to its reduction by about 4 times and almost completely eliminate the costs of designing and manufacturing special equipment. The technology passed production approbation in the conditions of the existing screw-manufacturing plant of JSC “Zvezdochka CC”. The methods of the analysis of technical systems on the basis of the theory of network graphs, as well as a technique for calculation of the process time norms are used.