At present a rapid development of additive technologies for the growth of metal and alloy products takes place. Each additive technology has its own rational field of application and its own characteristic set of advantages and disadvantages. The most promising technologies are new 3DMP-technologies of wire sedimentation/welding deposition by a method electric arc welding in combination with subtractive machining technologies (additive-subtractive technologies). The application of 3DMP-technologies in comparison with common and some powder technologies results in the considerable decrease of production costs and substantial increase of growth productivity, for them it is characteristic a high coefficient of initial material beneficial use. The advantage in use of additive-subtractive technologies (AST) consists in a possibility of the alternative use of additive and subtractive transitions at the formation of a part within the limits of one technological operation in a full compliance with the principle of community and constancy of technological bases. But AST peculiarity requires a complex solution of interrelated engineering and scientific problems including those in the field of design of products, material machining, engineering procedure automation and CAD systems. For instance, in consequence of that the realization of 3DMP-technology is possible only under conditions of complete process automation, in the presence of a subtractive module having 3-5 controlled coordinates, for the equipment on the whole the NC system is necessary which controls the execution unit displacement along six coordinate axes and more.

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For today cog-wheels are widespread parts in mechanical engineering. Hobbing cutters are to machine such parts with an efficient gear-cutting tool. For the preliminary machining of cog-wheel teeth of diesel locomotive wheel-pair m=10mm with the allowance for grinding there are used rough hobbing cutters. At that for the improvement of grinding conditions an allowance must be uneven: larger at the tooth top and less at the dedendum. Therefore special milling cutters are needed for machining cogwheels with the allowance for grinding. The existing solutions are not urgent in the field of limited and small-batch production in connection with high cost and large laboriousness in manufacturing such milling cutters. The paper reports the analysis of existing designs of rough hobbing cutters and also there is investigated and developed a design and methodology of rough hobbing cutter profiling for the preliminary teeth machining of a cog-wheel m=10mm of a diesel locomotive wheel pair. The most efficient solution is development of a solid rough double tooth hobbing cutter. This solution has a number of both design and engineering advantages. The modeling of a cutting process allowed offering an efficient circuit of allowance cutting. The analysis carried out has shown that such a design has a number of advantages including economic ones and it may be recommended for practical application.