Analysis of possibilities to improve the surface physical mechanical properties of screw type pump rotors
2009
Muiznieks, G., Riga Technical Univ. (Latvia). Inst. of Machine Building Technology | Gerins, E., Riga Technical Univ. (Latvia). Inst. of Machine Building Technology
More frequently rotor pumps and screw type compressors as kind of them are used as machines for production of compressed air. These compressors are operating with greater efficiency on high speeds of rotary rate, and operate in a wide range of pressures. The rotors of pump are inferior to influencing of variable forces and rotary moments which produce compressed gases. So, as the requirements for these rotors are comparing high, they should be made of quality materials, which provide excellent characteristics in statistical and dynamic pointers of mechanical resistance. In foundation of the article the main attention is paid to making of new or improved technologies, to perfect the properties of steels of lower quality, which will assure material, which always technological and mechanical dignities would characterize, adjusted for the production of rotors. The purpose of the work - to establish, that not always rotors should be made of regulated expensive materials, but it is possible to use cheaper materials. This work analyzes in more detail changes of steel technological, mechanical properties, using the mechanical strengthening, thermal and thermomechanical processing methods of strengthening, their advantages and failings. Knowing many elements, as for example, carbon, nitrogen and other elements which improve technological and mechanical properties of the overhead layer of material, in the work also the thermal influence is analyzed, and also the change of the properties of the surface using various coverages for rotors. At the end of the article the conclusion gives various advices for improvement of the surface of rotors.
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