Ensuring the Quality of Treatment of Holes in Products from Polymeric Composite Materials

Abstract

The generalized results of industrial and laboratory tests of unconventional technologies for improving the quality of manufacturing holes in products made of fibrous polymeric and layered hybrid composite materials are considered. Developed in BMSTU combined methods of processing, non-standard cutting tools and devices that ensure the combination of diverse energy impact on the treated surface, as well as the targeted creation of the required energy state of the material were given. It is shown that the application of the cutting method with additional technological coating on the operations of reaming, deployment and boring provides, depending on the processing conditions, a decrease in surface roughness of 1--3 classes (from 4 to 5--7 classes). Drilling with a thermo-mechanical impact on the cutting layer reduces the roughness parameter from Rz = 40--20 μm (class 4) to Ra = 2.5--1.6 μm (class 6). At the same time on the treated surfaces, fluffiness is completely eliminated. The possibility of increasing the productivity and quality of processing holes in multilayer hybrid composite materials by the use of special-purpose drills, which clean the processed surface on the backward pass of the tool, is considered. Practical recommendations are given to ensure defect-free processing of the hole edges at the tool inlet and outlet using additional coatings, as well as the creation of compressive stresses in the treatment area with the help of special tools.