| Popis: |
Possibilities for improving the use of antifriction coatings for finishing the antifriction non-abrasive treatment (FANT) were identified. Micro-cutting was used with the model experiment and methods of similarity and dimension theory. Several theoretical dependences have been established that allow evaluating the efficiency of the chip formation process, as well as to carrying out technological calculations of the micro-cutting performance. The laws governing the formation of an anti-friction coating at different rake cutting angles were studied, which made it possible to increase the effectiveness of finishing the antifriction non-abrasive treatment (FANT) at the stage of micro-cutting. The experimental interaction between cast iron and brass has proved that the intensive wear of the cast iron micro cutter occurs at the very beginning of processing, after which the value of the blunt radius of the cutting edge remains almost unchanged and depends only on the rake cutting angle. It is shown that with a decrease in the cutting angle, the contact area of the cutting edge of the micro cut increases by increasing the tool wear, which leads to an increase in the blunt radius of the cutting edge, a decrease in the volumetric efficiency of micro-cutting and the transition of a part of micro-cutting to the surface plastic deformation. Thus, to improve the efficiency of the FANT process, it is necessary to ensure that a regular micro relief of the initial surface is obtained with a positive cutting angle. |
