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D. V. Ardashev – One of the best experts on this subject based on the ideXlab platform.
Simulation of grinding with wear of the Abrasive GrainsRussian Engineering Research, 2017Co-Authors: D. V. Ardashev, L. V. ShipulinAbstract:
A geometric model of grinding is developed. For the first time, this model takes account of wear of the Abrasive Grain. That permits prediction of the surface roughness at any time of tool operation. The wear is taken into account in terms of the physicochemical and mechanical interaction of the Abrasive and the workpiece. This is of great importance for multiproduct manufacturing.
Thermomechanical Fatigue of Abrasive GrainProcedia Engineering, 2017Co-Authors: D. V. ArdashevAbstract:
Abstract The article contains the results of the research intp microcutting processes of different materials with single Abrasive Grains. The research was conducted on the face-grinding machine with a special device installed which allows setting the separate Abrasive Grains and do microcutting. One of the factors changing during the research is the temperature of the processed sample. A different temperature of the sample was achieved with the help of the gas burner. The results of the research made it possible to define the coefficient of thermomechanical fatigue for each combination of processing mode and type of the material and its changing due to the temperature of the grinding sample. The results will help to develop the methodology of projecting effective grinding operations in a wide variety of technological conditions, with respect to the working capacity of the Abrasive tool.
Recursive model of the blunting of an Abrasive GrainRussian Engineering Research, 2016Co-Authors: D. V. ArdashevAbstract:
An algorithmic model is proposed for calculating the blunting area of an Abrasive Grain in grinding. The model permits prediction of the blunting of an Abrasive tool in a broad range of operating conditions. It is recursive: the nonlinear feedback with respect to the blunting area itself is taken into account. The model permits prediction of the performance of Abrasive tools in different conditions. That is especially important in manufacturing today.
David Lee Butler – One of the best experts on this subject based on the ideXlab platform.
Simulation of surface grinding process, part 2: interaction of the Abrasive Grain with the workpieceInternational Journal of Machine Tools and Manufacture, 2005Co-Authors: T.a. Nguyen, David Lee ButlerAbstract:
Abstract This paper is the second part of the two-part series, which describes the kinematic simulation of the grinding process. The complex wheel–workpiece interaction is taken into consideration in the generation of the workpiece surface. An algorithm is proposed to identify the active Abrasive Grains and their attack angles from the wheel topography. Based on the critical values of the attack angle, the Abrasive Grain is determined either to cut, plough or rub the workpiece. A numerical example is used to validate the approach.
Hassan Zahouani – One of the best experts on this subject based on the ideXlab platform.
Influence of Abrasive Grain geometry on friction coefficient and wear rate in belt finishingTribology International, 2013Co-Authors: A. Jourani, Benjamin Hagege, Salima Bouvier, Maxence Bigerelle, Hassan ZahouaniAbstract:
Abstract We focus our study on belt finishing process using a 3D model with multi-asperity Abrasive wear on real rough surfaces. The established model allows determining the effect of the local geometry of Abrasive Grain on the friction coefficient and wear rate. This study shows that the friction coefficient and wear rate increase with the local slopes of the roughness. With the increase of the macroscopic normal load, the wear rate increases rapidly. Such effect is related to the increase of the cutting force of each Grain leading to the transition in dominant wear mode from ploughing to wedging and cutting.
Wenxiang Zhao – One of the best experts on this subject based on the ideXlab platform.
experimental study on brittle ductile transition in elliptical ultrasonic assisted grinding euag of monocrystal sapphire using single diamond Abrasive GrainInternational Journal of Machine Tools & Manufacture, 2013Co-Authors: Zhiqiang Liang, Xibin Wang, Lijing Xie, Li Jiao, Wenxiang ZhaoAbstract:
Abstract This study is carried out to investigate the material removal characteristics in elliptical ultrasonic assisted grinding (EUAG) of monocrystal sapphire using single diamond Abrasive Grain. The scratching experiments are performed to develop a fundamental understanding of the ductile–brittle transition mechanism during EUAG of monocrystal sapphire. An elliptical ultrasonic vibrator attached with a sapphire substrate was set up on a multi-axis CNC controlled machining center equipped with a single point diamond tool. The vibrator was constructed by bonding a piezoelectric ceramic device (PZT) having two separated electrodes on a metal elastic body, and an elliptical ultrasonic vibration was generated on the end-face of the metal elastic body when two phases of alternating current (AC) voltages with a phase difference are applied to their respective electrodes on PZT. In scratching experiments, the effects of ultrasonic vibration on the critical depth of cut a c for the ductile–brittle transition region and the material removal ratio, i.e., the ratio of the removed material volume to the machined groove volume, f ab , are investigated by the examination of the scratching groove surfaces with SEM and AFM. The obtained results show that the critical depth of cut in EUAG is much larger than that in conventional grinding without vibration (CG), and even the bigger vibration amplitude leads to a greater improvement. Although the values of f ab in the ductile–brittle transition region in both EUAG and CG are less than 1, that in EUAG is bigger than that in CG. Furthermore, as the vibration amplitude increases, the value of f ab is increased to eventually be close to 1. These show that it is prone to achieve a ductile mode grinding in greater vibration amplitude. It was also found that in the process there are two kinds of material removal modes, i.e., continuous cutting and discontinuous cutting modes, which are determined by the relationship between values of vibration amplitude and depth of cut. This study validates that the elliptical ultrasonic assisted grinding method is highly effective in ductile mode machining of hard and brittle materials.
Ivan Iordanoff – One of the best experts on this subject based on the ideXlab platform.
Modelling the wear evolution of a single alumina Abrasive Grain: Analyzing the influence of crystalline structureJournal of Materials Processing Technology, 2020Co-Authors: Leire Godino, I. Pombo, Jérémie Girardot, Jose Antonio Sánchez, Ivan IordanoffAbstract:
The grinding process is continuously adapting to industrial requirements. New advanced materials have been developed, which have been ground. In this regard, new Abrasive Grains have emerged to respond to the demands of industry to reach the optimum combination of Abrasive-workpiece material, which allows for both the minimization of wheel wear and increased tool life. To this end — and following previous experimental works — the present study models in 3D the wear behavior of Sol-Gel alumina Abrasive Grain using Discrete Element Methods. It is established that the alumina behaves as a ductile material upon contact due to the effect of high temperature and pressure. This model reproduces the third body generation in the contact, taking into account the tribochemical nature of the wear flat, which is the most harmful type of wear in the grinding process. The evolution of the wear during a complete contact is analyzed, revealing similarities in the wear of white fused alumina (WFA) and Sol-Gel (SG) alumina. However, the SG Abrasive Grain suffers less wear than the WFA under the same contact conditions. The proposed wear model can be applied to any Abrasive-workpiece combination.