Technological restrictions of the application of micro-grinding semimanufactures from alloy steels

In world practice, progressive technologies for processing micro-parts are increasingly being used. These technologies include micro-grinding. Micro-grinding allows you to process small parts with high productivity and surface cleanliness. Micro-grinding has the advantage over other micro-component manufacturing processes because it provides very high surface roughness and minimal burrs. Analysis of literature sources showed that most of the works are aimed at studying the processing of materials such as glass, silicon, AD33, AD35 due to their wide field of application. All work related to the processing of alloy steels is of an empirical nature and consisted in the selection of optimal cutting conditions. Thus, there are no universal technologies for the micro-grinding process aimed at processing parts, and the technology for processing a specific part from a specific material must be developed based on the basic concepts of “mechanical engineering technology” and improved by analyzing empirical data. Within the framework of this work, experimental studies were carried out of the possibility of processing a part made of 40KhN2MA steel by the method of micro-grinding. For the study, an experimental stand was assembled on the basis of an EMCOMILL 300 vertical milling machine equipped with a HTS1501S high-speed pneumatic spindle. A Nakanishi drill with a diameter of 1.2 mm was selected as the cutting tool. At the stand, workpieces with and without heat treatment were sequentially processed. As a result of the study, the technological feasibility and efficiency of machining a part made of 40XH2MA steel by micro-grinding on a vertical CNC milling machine using a high-speed pneumatic spindle and a tool made of cubic boron nitride (CBN).