TY - JOUR AU - Bolló, Betti AU - Sarka, Ferenc AU - Voith, Katalin TI - Egy egyszerűsített fékmodell termikus elemzése JF - GÉP J2 - GÉP VL - 75 PY - 2024 IS - 1 SP - 19 EP - 22 PG - 4 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/34792165 ID - 34792165 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Makkai, Tamás AU - Sarka, Ferenc TI - CAD Modelling of a Milling Insert JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 13 PY - 2023 IS - 2 SP - 81 EP - 92 PG - 12 SN - 1785-6892 DO - 10.32972/dms.2023.019 UR - https://m2.mtmt.hu/api/publication/34430738 ID - 34430738 AB - There is often a problem when using FEM software where the tool geometry needs to be specified for the cutting simulation, one or more dimensions are not known. In the article, we present how and with what methods we determined these unknown dimensions, how we created the three-dimensional CAD model of the cutting insert as input data for the FEM software. We report our experience gained during the measurement and model creation process. LA - English DB - MTMT ER - TY - JOUR AU - Alzghoul, Mohammad AU - Sarka, Ferenc AU - Szabó, Ferenc János TI - Improving Chatter Performance of a Lathe Spindle through Grapho-Optimization JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 13 PY - 2023 IS - 2 SP - 5 EP - 12 PG - 8 SN - 1785-6892 DO - 10.32972/dms.2023.012 UR - https://m2.mtmt.hu/api/publication/34430468 ID - 34430468 AB - Structural modifications to spindle systems have been demonstrated in previous studies to improve their dynamical performance. The aim of this study is to improve the performance of a lathe spindle system in terms of chatter occurrence, while maintaining the same overall mass of the system. The design of the spindle system is optimized using the grapho-optimization method, employing the Kuhn-Tucker optimality criterion to evaluate the design parameters. Specifically, the thickness of the spindle shaft and the diameter of the shaft next to the chuck are varied. The optimized spindle system shows a significant improvement in the first natural frequency value compared to the original design; the first natural frequency is increased by 59.7 %. LA - English DB - MTMT ER - TY - JOUR AU - Sarka, Ferenc TI - Modelling possibilities of bolt connections with finite element method JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 13 PY - 2023 IS - 1 SP - 112 EP - 123 PG - 12 SN - 1785-6892 DO - 10.32972/dms.2023.009 UR - https://m2.mtmt.hu/api/publication/34032515 ID - 34032515 AB - In the article, the possibilities of simulating bolted joints in the Ansys finite element program are presented. The purpose of the publication is to draw attention to the various simulating options. In the article, different simulation options are used for the same model. The versions to be used are 1) bolt connection without preload 2) bolt-tool, 3) beam-tool, 4) real screw thread modelling. In the article, I rely on previous publications, so some stages are presented in less detail than others. During the simulations, I compare the number of elements used, number of nodes, running time, stress and deformation results. The model used is a closed space loaded with internal pressure, which is divided into two halves. A gasket is installed between the two halves, the two halves are fastened to each other by a row of screws. In order to manage the running times, I only examine the part of the entire model corresponding to one screw. The screw joint is loaded with pretension, and the connecting elements with a constant pressure. Where possible in the software, the tightening torque is also taken into account. The results are presented in tabular form for easier comparison. LA - English DB - MTMT ER - TY - JOUR AU - Pintér, Ádám Sándor AU - Sarka, Ferenc TI - Investigation of the involute spur gears with different pressure angles JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 13 PY - 2023 IS - 1 SP - 103 EP - 111 PG - 9 SN - 1785-6892 DO - 10.32972/dms.2023.008 UR - https://m2.mtmt.hu/api/publication/34032505 ID - 34032505 AB - This article deals with an investigation of the choice of the profile shift coefficient for gears when the standard pressure angles of the gears are different. The basic idea for the study arose from a real-life problem where a gear in a piece of equipment needed to be replaced. In this article, a method is presented to determine, by approximation, the value of the profile shift coefficient that we have to use on a gear having 20° pressure angle to get similar tooth profile of a gear without profile shift and 21°of pressure angle. In addition, theoretical investigations are also carried out on the topic of gear meshing, using the profile shift coefficient. LA - English DB - MTMT ER - TY - JOUR AU - Pintér, Ádám Sándor AU - Sarka, Ferenc TI - Fogaskerék profilpontok létrehozása profileltolás tényező alkalmazása során JF - MULTIDISZCIPLINÁRIS TUDOMÁNYOK: A MISKOLCI EGYETEM KÖZLEMÉNYE J2 - MULTIDISZCIPLINÁRIS TUDOMÁNYOK VL - 13 PY - 2023 IS - 1 SP - 12 EP - 20 PG - 9 SN - 2062-9737 DO - 10.35925/j.multi.2023.1.2 UR - https://m2.mtmt.hu/api/publication/33706581 ID - 33706581 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Alzghoul, Mohammad AU - Sarka, Ferenc AU - Szabó, Ferenc János TI - Analytical and Experimental Techniques for Chatter Prediction, Suppression and Avoidance in Turning: Literature Survey JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 12 PY - 2022 IS - 2 SP - 33 EP - 43 PG - 11 SN - 1785-6892 DO - 10.32972/dms.2022.011 UR - https://m2.mtmt.hu/api/publication/33250226 ID - 33250226 AB - Chatter is a self-excited vibration that takes place during turning operations. It is either to be avoided or reduced for its negative impact on the machine-tool, the workpiece surface finish, and the cutting tool life. A lot of research has been carried out in this domain to understand this phenomenon, which leads to finding ways to detect, identify, avoid, reduce, and control chatter in turning processes. In this paper, chatter research related to turning processes is reviewed and summarized. The main goal of this review paper is to compare different chatter prediction, suppression, and avoidance techniques to find out the most effective technique, so a scope of a work related to turning processes chatter is defined. LA - English DB - MTMT ER - TY - JOUR AU - Alzghoul, Mohammad AU - Sarka, Ferenc AU - Szabó, Ferenc János TI - A Spindle System Analysis Using Systems Receptance Coupling Approach JF - DESIGN OF MACHINES AND STRUCTURES J2 - DESIGN MACHINES STRUCTURES VL - 12 PY - 2022 IS - 2 SP - 25 EP - 32 PG - 8 SN - 1785-6892 DO - 10.32972/dms.2022.010 UR - https://m2.mtmt.hu/api/publication/33250206 ID - 33250206 AB - The goal of this study is to dynamically simulate a turning-centre main spindle system utilizing the systems receptance coupling technique to determine the spindle system's first three resonant frequencies in the event of transverse vibrations. The findings are then confirmed using the finite element technique using ANSYS software. The significance of analysing the spindle system described in this study is that it can be utilized to optimize the spindle system in terms of resonance frequencies for improved performance in terms of spindle vibration while the turning centre is in operation. LA - English DB - MTMT ER - TY - JOUR AU - Sarka, Ferenc TI - Csavarkötés modellezési lehetőségei végeselemes módszerrel JF - MULTIDISZCIPLINÁRIS TUDOMÁNYOK: A MISKOLCI EGYETEM KÖZLEMÉNYE J2 - MULTIDISZCIPLINÁRIS TUDOMÁNYOK VL - 12 PY - 2022 IS - 2 SP - 60 EP - 70 PG - 11 SN - 2062-9737 DO - 10.35925/j.multi.2022.2.5 UR - https://m2.mtmt.hu/api/publication/33168906 ID - 33168906 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Sarka, Ferenc TI - Examination of Bolt Connection with Finite Element Method JF - LECTURE NOTES IN MECHANICAL ENGINEERING J2 - LECT NOTES MECHAN ENG VL - Vehicle and Automotive Engineering 4 PY - 2022 SP - 212 EP - 222 PG - 11 SN - 2195-4356 DO - 10.1007/978-3-031-15211-5_19 UR - https://m2.mtmt.hu/api/publication/33089329 ID - 33089329 N1 - Megjelent a Vehicle and Automotive Engineering 4 c. kötetben, Softcover ISBN: 978-3-031-15210-8 (Published: 10 September 2022), eBook ISBN: 978-3-031-15211-5 (Published: 09 September 2022), Copyright Year: 2023 WoS:hiba:000926145500019 2023-12-31 12:11 típus nem egyezik, év nem egyezik LA - English DB - MTMT ER -