TY - JOUR AU - Makkai, Tamás TI - A homlokmarás kutatásának főbb eredményei 1. rész: A forgácsolóerő vizsgálata JF - MULTIDISZCIPLINÁRIS TUDOMÁNYOK: A MISKOLCI EGYETEM KÖZLEMÉNYE J2 - MULTIDISZCIPLINÁRIS TUDOMÁNYOK VL - 12 PY - 2022 IS - 5 SP - 110 EP - 123 PG - 14 SN - 2062-9737 DO - 10.35925/j.multi.2022.5.11 UR - https://m2.mtmt.hu/api/publication/33596500 ID - 33596500 LA - Hungarian DB - MTMT ER - TY - CHAP AU - PELIKÁN, Lukáš AU - PETRÁŠEK, Šimon AU - HLAVŮŇKOVÁ, Lucie AU - STRÁNSKÝ, Ondřej AU - SLANÝ, Michal ED - Kudláček, Jan TI - HIGH STRENGTH STRUCTURAL STEELS DRY MACHINING INVESTIGATION T2 - Technological Forum 2022 PB - Szerzői kiadás CY - Jaromer SN - 9788087583364 PY - 2022 SP - 158 EP - 164 PG - 7 UR - https://m2.mtmt.hu/api/publication/33370694 ID - 33370694 LA - English DB - MTMT ER - TY - JOUR AU - Thien, Nguyen Van AU - Trung, Do Duc TI - Study on model for cutting force when milling SCM440 steel JF - EUREKA: Physics and Engineering VL - 5 PY - 2021 IS - 5 SP - 23 EP - 35 PG - 13 SN - 2461-4254 DO - 10.21303/2461-4262.2021.001743 UR - https://m2.mtmt.hu/api/publication/32202147 ID - 32202147 AB - This article presents empirical study results when milling SCM440 steel. The cutting insert to be used was a TiN coated cutting insert with tool tip radius of 0.5 mm. Experimental process was carried out with 18 experiments according to Box-Behnken matrix, in which cutting speed, feed rate and cutting depth were selected as the input parameters of each experiment. In addition, cutting force was selected as the output parameter. Analysis of experimental results has determined the influence of the input parameters as well as the interaction between them on the output parameters. From the experimental results, a regression model showing the relationship between cutting force and input parameters was built. Box-Cox and Johnson data transformations were applied to construct two other models of cutting force. These three regression models were used to predict cutting force and compare with experimental results. Using parameters including coefficient of determination (R-Sq), adjusted coefficient of determination (R-Sq(adj)) and percentage mean absolute error (% MAE) between the results predicted by the models and the experimental results are the criteria to compare the accuracy of the cutting force models. The results have determined that the two models using two data transformations have higher accuracy than model not using two data transformations. A comparison of the model using the Box-Cox transformation and the model using the Johnson transformation was made with a t-test. The results confirmed that these two models have equal accuracy. Finally, the development direction for the next study is mentioned in this article LA - English DB - MTMT ER - TY - JOUR AU - Geier, Norbert TI - Influence of fibre orientation on cutting force in up and down milling of UD-CFRP composites JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 111 PY - 2020 SP - 881 EP - 893 PG - 13 SN - 0268-3768 DO - 10.1007/s00170-020-06163-3 UR - https://m2.mtmt.hu/api/publication/31625427 ID - 31625427 N1 - Funding Agency and Grant Number: Budapest University of Technology and Economics; National Research, Development and Innovation Office (NKFIH) [OTKA-PD20-134430]; project "Centre of Excellence in Production Informatics and Control" (EPIC) [EU H2020-WIDESPREAD-01-2016-2017-TeamingPhase2-739592]; Portugal-Hungarian bilateral scientific cooperation Project [2018-2.1.15-TET-PT-2018-00012]; BME NC TKP2020 grant of NKFIH Hungary Funding text: Open access funding provided by Budapest University of Technology and Economics. This research was partly supported by the National Research, Development and Innovation Office (NKFIH) No. OTKA-PD20-134430 and by the project "Centre of Excellence in Production Informatics and Control" (EPIC) No. EU H2020-WIDESPREAD-01-2016-2017-TeamingPhase2-739592. The research work introduced herein was partly supported by the Portugal-Hungarian bilateral scientific cooperation Project No. 2018-2.1.15-TET-PT-2018-00012 and by the BME NC TKP2020 grant of NKFIH Hungary. Funding Agency and Grant Number: Budapest University of Technology and Economics; National Research, Development and Innovation Office (NKFIH)National Research, Development & Innovation Office (NRDIO) - Hungary [OTKA-PD20-134430]; project "Centre of Excellence in Production Informatics and Control" (EPIC) [EU H2020-WIDESPREAD-01-2016-2017-TeamingPhase2-739592]; Portugal-Hungarian bilateral scientific cooperation Project [2018-2.1.15-TET-PT-2018-00012]; BME NC TKP2020 grant of NKFIH HungaryNational Research, Development & Innovation Office (NRDIO) - Hungary Funding text: Open access funding provided by Budapest University of Technology and Economics. This research was partly supported by the National Research, Development and Innovation Office (NKFIH) No. OTKA-PD20-134430 and by the project "Centre of Excellence in Production Informatics and Control" (EPIC) No. EU H2020-WIDESPREAD-01-2016-2017-TeamingPhase2-739592. The research work introduced herein was partly supported by the Portugal-Hungarian bilateral scientific cooperation Project No. 2018-2.1.15-TET-PT-2018-00012 and by the BME NC TKP2020 grant of NKFIH Hungary. LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Zsolt Ferenc AU - Viharos, Zsolt János AU - Kodácsy, János TI - Surface flatness and roughness evolution after magnetic assisted ball burnishing of magnetizable and non-magnetizable materials JF - MEASUREMENT J2 - MEASUREMENT VL - 158 PY - 2020 PG - 9 SN - 0263-2241 DO - 10.1016/j.measurement.2020.107750 UR - https://m2.mtmt.hu/api/publication/31254168 ID - 31254168 N1 - Funding Agency and Grant Number: "The development and enhancement of the research potential at John von Neumann University"project [EFOP-3.6.1-16-2016-00006]; Hungarian Government; European Social FundEuropean Social Fund (ESF); Higher Education Excellence Program of the Ministry of Human Capacities; European Commission through the H2020 project EPIC [739592]; Hungarian grant on an "Research on prime exploitation of the potential provided by the industrial digitalisation" [ED_18-2-2018-0006] Funding text: This research is party supported by EFOP-3.6.1-16-2016-00006 ``The development and enhancement of the research potential at John von Neumann University"project. The Project is supported by the Hungarian Government and co-financed by the European Social Fund.; The research reported in this paper was supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Nanotechnology research area of Budapest University of Technology and Economics (BME FIKP-NANO).; The research in this paper was (partially) supported by the European Commission through the H2020 project EPIC (https://www.centre-epic.eu/) under grant No. 739592 and by the Hungarian ED_18-2-2018-0006 grant on an ``Research on prime exploitation of the potential provided by the industrial digitalisation". LA - English DB - MTMT ER - TY - JOUR AU - Póka, György AU - Németh, István TI - The effect of radial rake angle on chip thickness in the case of face milling JF - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE J2 - P I MECH ENG B-J ENG VL - 234 PY - 2020 IS - 1-2 SP - 40 EP - 51 PG - 12 SN - 0954-4054 DO - 10.1177/0954405419849245 UR - https://m2.mtmt.hu/api/publication/30685894 ID - 30685894 AB - The existing models of undeformed chip thickness for face milling found in the literature neglect the radial rake angle of the tool, and they assume that its value is zero. The effect of the variation of the radial rake angle has not yet been discussed in the literature. As a novelty, this article investigates such an effect, especially the effect on chip thickness. A new tool model is proposed that takes into account the radial rake angle. A new method to calculate the chip thickness has been developed that uses the new tool model and is based on several existing numerical and approximation methods. It is analytically proved that the effect of the radial rake angle must be taken into account for calculating accurate results; however, in the case of lower feed rates, that effect is insignificant. The presented procedures are evaluated with respect to their accuracy and computing requirements. The proposed new methods have been verified by cutting experiments. LA - English DB - MTMT ER - TY - JOUR AU - Geier, Norbert AU - Szalay, Tibor AU - Takács, Márton TI - Analysis of thrust force and characteristics of uncut fibres at non-conventional oriented drilling of unidirectional carbon fibre-reinforced plastic (UD-CFRP) composite laminates JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 100 PY - 2019 IS - 9-12 SP - 3139 EP - 3154 PG - 16 SN - 0268-3768 DO - 10.1007/s00170-018-2895-8 UR - https://m2.mtmt.hu/api/publication/30598095 ID - 30598095 AB - Carbon fibre-reinforced plastic (CFRP) is an often-used structural material in the high-tech industries, like aerospace, wind turbine, sport, automobile, robotics and military. Due to both the growing application area of composites, and the advanced construction requirements, the used thickness of the CFRP plates increases, and the necessity of drilling holes on the sides of the plates (normal II direction) becomes even more important. Many researchers studied the machinability of UD-CFRP using numerous drilling experiments at the normal I direction. However, drilling experiments at normal II and axial directions were not published yet. The main objective of the present study is to analyse and discuss the influence of a non-conventional drilling direction on hole-quality parameters and on the thrust force. Drilling experiments were carried out in unidirectional CFRP at non-conventional drilling direction, based on central composite inscribed design. Influences of feed rate and cutting speed were analysed using response surface methodology (RSM) and analysis of variance (ANOVA) techniques. Characteristics of uncut fibres were analysed using digital image processing (DIP). The results have proved that the effect of the cutting speed is more significant when drilling UD-CFRP at the non-conventional drilling direction than at the conventional one. Furthermore, the specific feed force (k(f)) in the case of the non-conventional drilling direction was more than three times higher than the k(f) in the case of the conventional one. LA - English DB - MTMT ER - TY - THES AU - Biró, István TI - A forgácsleválasztás energetikai modelljének kiterjesztése nagy szilárdságú acél precíziós és mikroforgácsolási technológiájához PB - Budapesti Műszaki és Gazdaságtudományi Egyetem PY - 2018 SP - 165 UR - https://m2.mtmt.hu/api/publication/3383924 ID - 3383924 AB - A forgácsolás napjainkban és a hosszútávú jövőben is az alkatrészek gyártásának egyik leggyakrabban alkalmazott módszere. A műszaki termékeket jellemző miniatürizálás miatt egyre nagyobb hangsúly helyeződik a precíziós- és mikroforgácsolási eljárásokra, melyek során új, korszerű anyagok munkálandók meg. Doktori kutatásom során az S960QL minőségű, nagy szilárdságú szerkezeti acélon, szabályos élű szerszámmal végzett forgácsleválasztás körülményeit vizsgáltam. Ezt a forgácsolás energetikai jellemzőinek, azon belül a forgácsképzés és az ezzel járó deformációs folyamatok megvalósításához szükséges fajlagos forgácsolási erő értékelésével végeztem. A fajlagos erő modelljének olyan, a technológiai paraméterek függvényében történő kiterjesztését tűztem ki célul, melynek köszönhetően hatékonyan egyesíthető a már jól ismert makromegmunkálási zóna leírása a mikrométer nagyságrendű forgácsvastagság mellett történő forgácsoláséval. Kutatómunkám első lépéseként áttekintettem a vizsgált anyag minőségi csoportjának jellegzetességeit, illetve összefoglaltam azokat a folyamatjellemzőket és modellezési lehetőségeiket, melyek a forgácsolást a folyamat fenntartásának energiaszükséglete tekintetében jellemzik. Kutatási céljaim eléréséhez szisztematikus forgácsolási kísérleteket végeztem a technológiai paramétereknek adott tartományokon belül vett nagyszámú kombinációja mellett. Homlokmarási kísérleteket hajtottam végre annak érdekében, hogy a forgácsolás energetikai körülményeinek változását, a változás karakterisztikáját annak folyamatában vizsgálhassam. Ezt követően homlokbeszúró esztergálási teszteket realizáltam, melyeknek kettős feladata volt: egyrészt a marási kísérletekből kapott eredmények ellenőrzése, másrészt azon hipotéziseim igazolása, melyeket a homlokmarások adatainak kiértékelési eredményei és a vonatkozó szakirodalmi ismeretek összevetése alapján megfogalmaztam meg. Munkám eredményeként jegyezhető a megállapítás, miszerint az S960QL acél forgácsolása során a fajlagos forgácsolóerőnek az elméleti forgácsvastagság függvényében értelmezett görbéjében új szakaszhatár azonosítható a mikroméretű forgácsvastagság tartományán. Mérési adataim alapján azonosítottam a fajlagoserő-görbének az új szakaszhatár által határolt szakaszát a technológiai paraméterek vizsgált tartományára vonatkozóan, ahol a munkadarab-anyag felületi rétegének lokális rugalmas és képlékeny alakítása történik anyagleválasztás nélkül. Ily módon a szakaszhatár helye az anyagleválasztás alsó technológiai korlátját definiálja. Ezt alátámasztják a homlokbeszúró esztergálás kiértékelésének eredményei, melyeket célzottan úgy terveztem, hogy az anyagleválasztás során ténylegesen működő, deformálatlan forgácskeresztmetszet geometriai mérésére a forgácsolást követően lehetőségem legyen. Az ily módon validált homlokmarási adatok rámutattak, hogy az új szakaszhatárt azonosító forgácsvastagság értéke elsődlegesen az élenkénti előtolás, másodlagosan a forgácsoló sebesség növelésével növekszik. E jelenségek közvetetten azonosíthatók a szakirodalomban fellelhető független kutatási eredményekben is. Kutatómunkám további hozománya e tényszerű megállapítások mellett olyan kísérleti és kiértékelési módszer-együttes, mely lehetővé teszi a fajlagos forgácsolóerő részletes vizsgálatát mérési adatokra alapozva, kezelve az olyan tranziens jelenségeket is, mint a szerszámél belépése és kilépése az anyagból. A kiértékelési módszertanokat egyedi, jelen körülményekre specifikált szoftverekbe ágyaztam, biztosítva ezzel a mérési adatok hatékony és reprodukálható kiértékelését. A dolgozatban ismertetett kutatás folytatásaként említem újabb kísérletek elvégzését a technológiai paraméterek jelenleg nem vizsgált tartományán, továbbá az új tudományos megállapításaim érvényességének vizsgálatát más fémes anyagok esetére is. LA - Hungarian DB - MTMT ER - TY - JOUR AU - B, Z Balázs and M Takács TI - Finite element modelling of thin chip removal process JF - IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING J2 - IOP CONF SER MATER SCI ENG VL - 426 PY - 2018 IS - 1 SP - 012002 SN - 1757-8981 UR - https://m2.mtmt.hu/api/publication/30317951 ID - 30317951 AB - Micro milling is a continuously spreading, and therefore heavily researched technology. In this subject plenty of publications are highlighting the fact that there are many issues, which still has to be solved. Micro milling realizes thin chip removal process. In this paper 2D finite element simulation was performed to investigate the characteristics of small sized chip formation. Results of micro milling experiments were analysed too. This paper presents the results regarding effects of the cutting parameters (cutting speed, feed per tooth) on cutting temperature and machining forces at 2D finite element. Results based on different material models were compared with each other too. LA - English DB - MTMT ER - TY - JOUR AU - Gyurika, István Gábor TI - Researching the effects of feedrate and diamond grain size on edge chipping of milled granites JF - TEHNICKI VJESNIK-TECHNICAL GAZETTE J2 - TEH VJESN VL - 25 PY - 2018 IS - Suppl 1 SP - 49 EP - 55 PG - 7 SN - 1330-3651 DO - 10.17559/TV-20160504130353 UR - https://m2.mtmt.hu/api/publication/3409487 ID - 3409487 N1 - Funding Agency and Grant Number: Szechenyi [EFOP-3.6.1-16-2016-00015] Funding text: We acknowledge the financial support of Szechenyi 2020 under the EFOP-3.6.1-16-2016-00015. Supplement: 1 LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Zsolt Ferenc AU - Viharos, Zsolt János AU - Kodácsy, János TI - Determination of the working gap and optimal machining parameters for magnetic assisted ball burnishing JF - MEASUREMENT J2 - MEASUREMENT VL - 118 PY - 2018 SP - 172 EP - 180 PG - 9 SN - 0263-2241 DO - 10.1016/j.measurement.2018.01.033 UR - https://m2.mtmt.hu/api/publication/3328456 ID - 3328456 N1 - Funding Agency and Grant Number: European Commission through the H project EPIC [739592] Funding text: The research reported is supported by the European Commission through the H2020 project EPIC under grant No. 739592. LA - English DB - MTMT ER - TY - JOUR AU - Biró, István AU - Szalay, Tibor TI - Extension of empirical specific cutting force model for the process of fine chip-removing milling JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 88 PY - 2017 IS - 9 SP - 2735 EP - 2743 PG - 9 SN - 0268-3768 DO - 10.1007/s00170-016-8957-x UR - https://m2.mtmt.hu/api/publication/3077374 ID - 3077374 N1 - Funding Agency and Grant Number: CEEPUS III [HR 0108]; Hungarian-Mexican Bilateral Project [TeT-12_MX]; EUEuropean Commission [H2020-WIDESPREAD-2014-1-FPA-664403]; [TAMOP-4.2.2.B-10/1-2010-0009] Funding text: The work reported in this paper is connected to the project "Talent care and cultivation in the scientific workshops of BME" project. The project is supported by grant TAMOP-4.2.2.B-10/1-2010-0009. The authors would like to acknowledge the support provided by the CEEPUS III HR 0108 project. The current research is connected to the topic of the project TeT-12_MX Hungarian-Mexican Bilateral Project "Experimental and theoretical optimization and control of machining technology and tool path for micro milling". This research was partly supported by the EU H2020-WIDESPREAD-2014-1-FPA-664403 Teaming project "Centre of Excellence in Production Informatics and Control". The authors would also like to express their gratitude to Sumitomo Electric Hardmetal Ltd. for making the milling tool and inserts available for the purpose of the current study. AB - Specific cutting force is a frequently used parameter to classify and describe the energetic environment of mechanical machining operations. It defines the ratio of cutting forces and theoretical chip section during machining. This definition makes it possible to create general technological models for precise process planning. Classical models of cutting forces already indicate that specific cutting force cannot be modelled using a single low-level analytical function due to the marked presence of size effect. The problem is amplified in the case of micro-chip forming, where the relative scale of elastic and plastic deformations in the machined material differ from those experienced in conventional cutting conditions. Previous research proved that boundaries of specific cutting forces can be defined by values of exact uncut chip thicknesses, in which case the sections of specific cutting force may indicate different types of material deforming processes. The aim of current research presented in this paper is to extend the empirical model of specific cutting force for fine chip-removing cutting processes by identifying a new boundary section of uncut chip thickness. Therefore, a new boundary chip thickness was defined based on data obtained with reference to experimental cutting force. New boundary chip thickness follows the so-far proven tendencies of already known section borders and this enables the extension of the validity range of classical approaches presented by specific cutting force models beyond macro-scaled chip forming to micro-scaled chip forming processes. The extension of the model considers the effect of cutting parameters, primarily that of feed rate. LA - English DB - MTMT ER - TY - JOUR AU - Czampa, Miklós AU - Biró, István AU - Szalay, Tibor TI - A novel machinability test for determining the cutting behaviour of iron-based, carbon-containing and copper-containing powder metallurgy steels (PMS) JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 89 PY - 2017 IS - 9-12 SP - 3495 EP - 3507 PG - 13 SN - 0268-3768 DO - 10.1007/s00170-016-9313-x UR - https://m2.mtmt.hu/api/publication/3102549 ID - 3102549 N1 - Funding Agency and Grant Number: EUEuropean Commission [H2020-WIDESPREAD-2014-1-FPA 664403]; international bilateral project 'Experimental and theoretical optimization and control of machining technology and tool path for micro milling' [TET_12_MX-1-2013-0015]; CEEPUS III [HR 0108] Funding text: This research is partly supported by the EU-funded H2020 project 'Centre of Excellence in Production Informatics and Control' (EPIC) under project number H2020-WIDESPREAD-2014-1-FPA 664403. The research results are used in the international bilateral project 'Experimental and theoretical optimization and control of machining technology and tool path for micro milling' listed under number TET_12_MX-1-2013-0015. The authors would also like to acknowledge the support provided by the CEEPUS III HR 0108 project. The authors also express their gratitude to Carbosint Kft. for supporting the production of test specimens and for cooperating in their evaluation. AB - Parts made by powder metallurgy generally do not require subsequent machining operations. However, further machining of these sintered parts cannot be avoided in case of special, complex geometries. The goal of the research discussed in this paper is to create an easy-to-use, time-efficient and cost-efficient method to describe the secondary machining properties of iron-based, copper-containing and carbon-containing powder metallurgy steels (PMSs) in terms of the energy indicators. In order to compare the machinability of PMSs with different compositions, a new test method was developed. Considering the high importance of the turning process in the manufacturing of PMS parts, a short axial grooving test was developed. Cutting force measurements were carried out where the characteristics of the measured signal referred to the machinability of the tested materials. This newly developed test can be carried out quickly, and it can successfully be applied to characterize the energetics of PMS machining. Based on the test results, appropriate alloying element percentages could be determined. LA - English DB - MTMT ER - TY - JOUR AU - Horváth, Richárd AU - Lukács, Judit TI - Application of a Force Model Adapted for the Precise Turning of Various Metallic Materials JF - STROJNISKI VESTNIK-JOURNAL OF MECHANICAL ENGINEERING J2 - STROJ VESTN-J MECH E VL - 63 PY - 2017 IS - 9 SP - 489 EP - 500 PG - 12 SN - 0039-2480 DO - 10.5545/sv-jme.2017.4430 UR - https://m2.mtmt.hu/api/publication/3266504 ID - 3266504 N1 - Funding Agency and Grant Number: Ministry of Human Capacities, Hungary [UNKP-16-4/I] Funding text: Supported by the UNKP-16-4/I. New National Excellence Program of the Ministry of Human Capacities, Hungary. LA - English DB - MTMT ER - TY - JOUR AU - Sykora, Henrik Tamás AU - Kovács, Attila AU - Bachrathy, Dániel TI - Validation of Cutting Force Characteristic for Complex Toolpath JF - ACTA POLYTECHNICA CTU PROCEEDINGS J2 - ACTA POLYTECH CTU PROC VL - 3 PY - 2016 SP - 78 EP - 81 PG - 4 SN - 9788001058855 SN - 2336-5382 DO - 10.14311/APP.2016.3.0078 UR - https://m2.mtmt.hu/api/publication/3023123 ID - 3023123 LA - English DB - MTMT ER - TY - JOUR AU - Varga, Gyula TI - Possibility to increase the life time of surfaces on parts by the use of diamond burnishing process JF - KEY ENGINEERING MATERIALS J2 - KEY ENG MATER VL - 686 PY - 2016 SP - 100 EP - 107 PG - 8 SN - 1013-9826 DO - 10.4028/www.scientific.net/KEM.686.100 UR - https://m2.mtmt.hu/api/publication/3033992 ID - 3033992 LA - English DB - MTMT ER - TY - JOUR AU - I, Lirabi AU - H, Amirabadi TI - Geometrical model for rectangular-inserted face milling of surfaces with parabolic cross-sections in parallel direction with machining feed JF - MUNANDISI I MIKANIK I MUDARRIS / MODARES MECHANICAL ENGINEERING J2 - MODARES MECHANICAL ENGINEERING VL - 15 PY - 2015 IS - 13 SP - 176 EP - 181 PG - 6 SN - 1027-5940 UR - https://m2.mtmt.hu/api/publication/25127066 ID - 25127066 LA - Persian DB - MTMT ER -