Efficiency of Application of Epilams when Protecting the Surface of Fast Cutting Tools

Abstract

The article discusses the issues of increasing the efficiency of using nanocoatings of the working surfaces of a tool operating at relatively low cutting speeds. A theoretical and experimental approach is proposed, which is based on a model of the interaction of the internal three-dimensional state of the epilame layer, a two-dimensional material film and the material line closing it. An analysis of the state and shape of a liquid layer on a flat surface is given under the assumption that Young's equation is valid, which connects the contact angle with the values of surface stresses. Dependencies and a technique are given that allow you to control the behavior of an epilame drop on the surface of the cutting element. It was found that when thin-film coatings are applied from epilame solutions, a film is created on the surface of the instrument, which significantly changes the energy properties of the surface. It is shown that during the study of oil absorption of epilamated and unepilamated surfaces, as well as the study of the behavior of oil, the greatest retention of oil is observed during intermittent epilamated, presented in the form of large drops, the area of which depends on the area of unepilamated areas. It is recommended to carry out the following experimental research technique, which is associated with obtaining the initial parameters for determining the geometric parameters of a drop of the material under study on a flat surface. The radius of the projection of the drop onto the substrate, the profile of the drop when scanning the side view and then taking into account that the drop is a figure of rotation are determined, taking into account the previous data, its volume, the value of the wetting angle and the height of the drop are determined.