Elaboration of Technology for Making High-porous Abrasive Wheels of Monocrystalline Corund of the European Nomenclature Using a Precision Instrument of Superhard Materials for Turbobuilding of Ukraine

Abstract

Introduction. In order to increase the precision, productivity, and environment safety of production domestic turbinebuilding corporations purchase new European equipment and European nomenclature high-porous abrasive wheels using monocrystalline corundum.
Problem Statement. The mono-corundum wheels significantly differ from ordinary ones in terms of their high-precision trueing.
Purpose. To elaborate a technology for precision shaping of European nomenclature abrasive wheels using a tool made of superhard materials created in Ukraine for the needs of turbine-building corporations of Ukraine and import substitution of such tools.
Materials and Methods. The method for weighing and hydrostatic weighing of fragments of abrasive material of new European nomenclature grinding wheels (Best-Business c. s); mathematical simulation of balancing the volumes of grinding material, binder, and pores; and spectral analysis of the polished surface of the studied wheel samples have been used.
Results. The structure of studied wheels has been identified; it has been harmonized with GOST 2424-83 applicable in Ukraine. A relationship between the initial characteristics of wheels, the diamond tool, the shaping modes and the nature of tool wear and tool life has been established. The parameters of shaping the mono-corundum wheels have been optimized. Samples of the dressing and grinding tools from diamond and cubic boron nitride have been made and delivered for pilot tests to turbine-building corporations in Ukraine. The rollers 400/315 АС200Т made using the electroforming method have done 6.5 thousand trueing operations by 0.3 mm. The state of working surface remains perfect and there are no grounds to talk about the end of toll life.
Conclusion. The technology for precision shaping of European nomenclature abrasive wheels has been worked out using tools of superhard materials created in Ukraine, namely, in the Bakul Institute of Superhard Materials of the NAS of Ukraine, which have proven their high efficiency.