Influence of the Microstructure of Cutting Ceramics on the Efficiency of the Machining Process

Abstract

The article deals with the determination of the efficiency of a multi-bladed tool equipped with inserts made of oxide-carbide cutting ceramics, depending on the microstructural parameters of the tool material. The microstructural parameters of the oxide-carbide cutting ceramic, which affect the performance of the tool, are proposed to be determined according to the electrical resistance of the tool material. In order to implement the method for determining the working capacity of the instrument, a basic design of the device for measuring the electrical resistance of the material of the instrument is proposed. The device for measuring the electrical resistance of ceramic plates consists of a body made of a dielectric material, with channels for supplying a conductive material and a groove for installing a case with a test sample. During the test, the channels are filled with a liquid conductive material, which fills the cavity formed by the channel of the case, the groove of the case and the plate itself under test. To ensure uniform filling of the cavity, after the introduction of the liquid conductive material, metal balls are installed into the channels, which are made in such a size as to ensure free sliding along the channel, but not to let the liquid pass into the upper part of the channel. The tested ceramic plate is installed in the walls of the removable case. The walls of the removable case include electrodes, which, when the device is in operation, are inserted into a cavity with a liquid conductive material at one end, and are connected to an ohmmeter at the other. Using a device for measuring the electrical resistance of ceramic plates, it is possible to determine the operability of the tool and guarantee its operation without rejection for a certain period of time, which was confirmed by experimental research in the milling of workpieces of machine parts made of gray cast iron. Experimental studies in multi-edge machining with cutters with different values ​​of electrical resistance of ceramic plates made it possible to plot graphs of the dependence of the quality of machining during milling on the operability of the tool and on the time of the machining process.

Influence of process parameters on magnetic abrasive machining efficiency

“…where Q is the mass of the material to be removed, determined by the difference in masses to 𝑄 before and after 𝑄 after MAM; S is the surface area to be treated, cm 2 . Based on a literature review [1,4,6] and the capabilities of a dedicated magnetic blasting facility, two varying parameters were selected that have the greatest influence on the material removal process from the workpiece surface.…”

“…One possible way to solve the existing problem is to change the product's machining technology and replace the finishing operation with finishing turning using the magnetic abrasive machining (MAM) method [1,2]. This is a state-of-the-art machining approach that allows a high-quality machined product to be produced with minimal surface thermal defects.…”

Features of mechanical processing of aluminum alloys

“…Both mechanisms of magnetic field formation are investigated -with the help of an inductor (non-permanent magnets) or permanent neodymium magnets [1]. In order to ensure shaping, accuracy and the required quality indicators, it becomes relevant to improve the known mechanisms of magnetic field formation [2,3].…”

“…Aluminum and aluminum alloys are among the most commonly used light metal materials because they offer a number of different distinctive mechanical and thermal properties: low specific gravity, high ductility, corrosion resistance, high electrical conductivity [1]. In addition, they are relatively easy to shape, especially with the help of mechanical cutting [2].…”