Technological process of regeneration of seal rib and profile on tri-lobe Roots blower made in Germany is introduced comprehensively using the technique of electric brush plating & hot spray welding.

Taking NSR_40 Roots blower as an example, the processing ways, technics and NC program of this twist tri_lobe profile on the lathe machining center is set forth in detail.

The work process accurate dividing of three blade impeller realized by the use of positioning in the processing of three blade impeller for Roots blower are described.