К вопросу о влиянии подачи на шероховатость поверхности штока при накатывании роликом

Abstract

В работе представлены исследования влияния подачи ролика на шероховатость поверхности вала. Анализ зависимостей шероховатости обкатанных поверхностей Ra от подачи показывает, что зависимость является нелинейной, шероховатость поверхности зависит от ширины ролика, при одинаковых условиях обработки шероховатость штоков из стали 30Х обработанных роликами шириной 6 мм на 15-25% больше обработанных роликами шириной 4 мм

Determination of optimal cutting conditions is one of the most important technical and economic tasks of modern engineering, since the performance properties of these products depend on the quality of the surface layer of individual parts and assemblies, the latter forming at the finishing operations of processing [1-4]. Therefore, the problem of technological quality assurance of the surface layer of parts is an urgent task. In modern engineering in developed countries, the methods of surface plastic deformation (PPD) are widely used in the manufacture of products, which allow combining low roughness, hardening of the surface layer, high efficiency and simplicity of the technological process practically in any production conditions [1-4] . The purpose of the study was to study the effect of roller feeding on the surface roughness of the rod. In the experiment, preliminarily ground samples were examined, in an amount of 10 pcs. 30 mm in diameter, of steel 30X, the roughness of the surfaces of which was the same and was Ra = 2.5 μm. The rollers of width 4 and 6 mm were installed in the toolholder of the machine in such a way that its axis was at the height of the centers of the machine and was perpendicular to it, and the rear angle between the surfaces of the roller and the shaft was 2 °. To determine the effect of roller feeding on the roughness of its surface with an effort - pressing the tool against the rolling surface P = 700 N, the rolling speed V = 100 (m / min), using coolant - industrial oil, depth t = 0.2 mm, with the following The feed values are S = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4 mm / vol. The surfaces of the shafts were rolled in rollers in one pass. The force of rolling was determined by the transverse movement of the support of the machine (roller) along the limb, its value was set according to the calibration diagrams of rolling of 30X steel with cylindrical rollers 4 and 6 mm wide. Analysis of the dependence of the roughness of the rolled Ra surfaces on the feed shows that the dependence is nonlinear, the surface roughness depends on the width of the roller, under the same machining conditions, the roughness of the 30X steel rods treated with rollers 6 mm wide is 15-25% larger than the 4 mm-wide rolls treated.