Precision Machining of Wear-Resisting Friction Parts’ Plane Surfaces from New Composite Materials Based on High Alloy Steels for Technological Complexes
Background. Researches of fine processes of precision machining of wear-resisting friction parts’ plane surfaces from new composite materials based on die and instrumental steel wastes for technological complexes of printing machine building enterprises and also for machine tool systems of light and food industries of national economy of Ukraine were presented in the article. Objective. The purpose of this paper is to determine the quality parameters of precision machining with such new composite materials as 85Х6НФТ, 11Р3АМ3Ф, Р6М5К5, Р6М5Ф3, 4ХМФТС, 4Х2В5МФ and also to determine the effect of technological processing parameters on quality indexes of treated surfaces. Methods. Fine processes of precision machining of friction parts’ plane surfaces were carried out with C-15 machine tool. Disc material for fine machining is cast iron. As abrasive finishing micropowder s were used grains of white chrome electrocorund with the percentage composition of chromium oxide from 1.0 to 2 % (32A), titanium electrocorund with the percentage composition of titanium oxide from 1.5-2 % (37A), borazon (BN) and artificial diamond (AC). Granulosity of abrasive powders for fine machining is 1-14 μm. Composition of lubricating cooling liquid was mixture of kerosene (70 %) and industrial oil U16 (30 %). Results. It was demonstrated the technological factors of fine precision machining development such as cutting parameters, material and granulosity of abrasive powders for fine machining and also composition of lubricating cooling liquid essentially influence the quality of surface’s parameters of researched parts. The best results were obtained when using cast iron discs for finishing precision machining development, grains of artificial diamond (AC), borazon (BN) and white chrome electrocorund with the percentage composition of chrome oxide from 1.0 to 2 % (32A) with granularity 1-14 μm and at the same time with use of kerosene (70 %) + industrial oil U16 (30 %) mixture. Conclusions. For the first time it was shown the main regularities of fine precision machining parts’ plane surfaces from new composite materials based on stamp and die steel wastes meet fundamental regulations of super fine abrasive grinding in general theory. The recommendations for choice of cutting parameters for different technological purpose that are manufactured from composite alloys based on stamp and instrumental steels wastes are developed.