ЗАВИСИМОСТЬ ИЗНОСА РЕЖУЩЕЙ ПЛАСТИНЫ И ШЕРОХОВАТОСТИ ОБРАБОТАННОЙ ПОЕРХНОСТИ ОТ РЕЖИМОВ РЕЗАНИЯ ПРИ ТОНКОЛЕЗВИЙНОЙ ОБРАБОТКЕ ЦВЕТНЫХ СПЛАВОВ

МАШИНОСТРОЕНИЕ

Abstract

The dependence of roughness of the processed surface and the wear on the rear face on the optimal cutting conditions at thin-blade processing of aluminum and copper alloys with corundum cutting plates is given. The possibilities of thin - face milling of non-ferrous metals and alloys in terms of the quality of processing are revealed if we use cutting plates that are pre-oriented along the crystallographic axes, taking into account their unique properties. Experiments show that with an increase in the cutting speed, the height of microscopic irregularities decreases. It is characteristic that at low cutting speeds, this intensity of reduction is more obvious. A further increase in the speed does not lead to significant changes in Ra. Thus, the cutting speed has a great influence on the surface roughness. With the increase of v, plastic deformation decreases, therefore the height of microscopic irregularities Ra decreases. When processing low-plastic metals with high abrasion, surface microgeometry is determined by the conditions of friction and the distortion of the blade profile as they wear out. The feed also has a certain effect on the formation of surface microgeometry. The feed rate determines the shape and height of the residual scallops. With an increase in the thickness of the cutting shavings, the volume of the cutting layer will increase, the working length of the contact of the shavings with the front surface of the tool increases. When reducing the deformation of the layer being cut, the cutting force increases. Consequently, for these reasons, an increase in the feed rate leads to a deterioration of the surface microgeometry inherent in this type of machining. It is proved that the roughness of the processed surface at thin- balde machining of non-ferrous alloys with corundum cutting tools is within Ra = 0.32... 0.08 mkm, similarly to diamond. The wear on the rear face (h3 = 0.1 mm) when processing the above materials is 250...280 km, without the use of LCTM.