A brief analysis of the existing methods of additive technologies with reference to the aviation industry is carried out. The prospects of this direction are shown taking into account the possibility of production of aircraft parts on the principle of “bottom-up”. The results of researches of additive technology of electric arc surfacing in carbon dioxide of complex parts are presented. In the course of the carried out studies technological peculiarities of the technology connected with the parameters of welding arc, melting of cladding wire have been found out. Arc current has the greatest influence on the appearance of the molding. The wire feed rate affects the height of the welded roll. It is shown that the stability of the welded rolls formation depends on the modes of metal transfer, which depend on the conditions of wire feeding and insertion into the melt bath.
Results are presented from two experiments involving the pneumothermal forming of a cellular product of alloy OT4-1 in the superplastic regime. It was determined that the average velocity of the free part of the semifinished product must be taken into account when using a model in which the stresses depend directly on the deformation rate. Keywords: pneumothermal forming of disk-shaped parts, superplastic effect, temperature-speed conditions for deformation.The process of pneumothermal forming in the superplastic regime cannot be carried out without strictly adhering to the parameters specified for the forming operation. Those parameters are determined by modeling the process and constructing a graph which describes the change in pressure over time with allowance for the constancy of the deformation rate. The graph is usually calculated and plotted by using a model of the material in which the stresses depend directly on deformation rate [1]:where K is a proportionality factor; e is the deformation rate; m is the strain-hardening modulus; and σ is the stress. The behavior of the material during pneumothermal forming in the superplastic regime is described fairly simply by this model, but many factors are not accounted for. We chose a cellular 1-mm-thick part of alloy OT4-1 (Fig. 1) to study the effect of one of those factors -the average velocity of the free part of the semifinished product.The first stage of the investigation is the creation of a finite-element model of the semifinished product and the fixture. The model was constructed and the geometry of the elements in the forming operation (Fig. 2) was determined by using the CAD system Siemens NX.The software package PAM-STAMP 2G, created by the French company ESI Group, was used as the CAE system for modeling pneumothermal forming in the superplastic regime. In accordance with the aforementioned model, material OT4-1 was assigned the following parameters to perform the modeling operation in this software:• Young's modulus -112 GPa;
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.