ернативна технологія поверхневого зміцнення внутрішніх поверхонь довгомірних деталей

Abstract

Barrel survivability is the main indicator of tank guns. In order to ensure the competitiveness of Ukrainian armored vehicles on the foreign arms market, there was a need to ensure the survivability of the barrels of domestic tank guns at the level of the best world samples. Solving the problem of strengthening, restoring and increasing the service life of long-dimension parts is associated with the complexity of preparing and processing the inner surface (bore) along its entire length and eliminating possible residual deformations. The problem of increasing the survivability of tank gun barrels by applying protective coatings is considered. Their brief characteristics and limits of application are given. An alternative technology for surface hardening by electrical contact sintering of powder materials is proposed. This technology makes it possible to apply coatings up to 3 mm thick, with a density approaching that of a compact material and an adhesive strength of up to 220 MPa. Electrocontact sintering refers to impulse technologies and can exclude further mechanical processing of coatings The electrical contact method is the most promising method of strengthening and restoration, as it refers to the methods with the minimum necessary heating, thereby excluding thermal deformation of the parts being strengthened (this technology will allow to eliminate the most characteristic defect of the barrel, such as its swelling and distortion). For cauterization, a specially developed electrode-tool made of a copper alloy, dispersed-reinforced with solid particles, was used, which allows combining in one operation the application of coatings and the finishing treatment by the method of plastic surface deformation to the limit size, surface cleanliness and density.