ДОВОДКА РЕЖУЩИХ ПЛАСТИН СО СКРУГЛЕННЫМ ЛЕЗВИЕМ ДЛЯ ОБРАБОТКИ СПЛАВОВ ИЗ ЦВЕТНЫХ МЕТАЛЛОВ

МАШИНОСТРОЕНИЕ

Abstract

To obtain a high-quality machined surface and the required dimensional accuracy at finebladed processing of alloys from non-ferrous metals, the state of the working surfaces of the corundum cutting insert is of importance. In addition to the correct orientation of the cutting part of the plate, which is one of the main indicators of increasing the strength and wear resistance, it is necessary to pay attention to the state of the working surfaces of the corundum cutting insert. It has been experimentally established that, in comparison with undeveloped surfaces, the wear resistance of the finished working surfaces is 1.5 ... 3.0 times higher. In addition, the radius of curvature of the cutting blade of the plate is of great importance, the presence of which ensures the required state of working surfaces, removing the defects after sharpening, and thereby increasing the wear resistance and strength of corundum plates. A preliminary break-in of the cutting inserts also leads to such a result. To obtain the minimum possible radii of the rounding radius of the cutting blade of the plate ( ρ = 0.5 ... 1.5 μm), without chips and cracks at 500 × magnification, the tips of the cutting inserts were made, using a leather or cloth tape lubricated with diamond paste AM1.
The essence of this method is as follows: by means of debugging in a short period of time, depending on the number of forward-backward movements, the edges are rounded and at the same time defects are removed. After that, the front surfaces of the cutting inserts were made on a cast iron disc. Experiments showed that when the front surface of the cutting insert is brought to the surface, depending on the time and effort from the cutting insert, layers of different sizes are removed. In the implementation of finishing, the quality of the surface of the rounded section depends on the size of the layer to be removed. It is established that the calculated results of cutting forces in the processing of alloys from non-ferrous metals with rounded blades of cutting inserts completely coincide with the experimental data.