Zsolt Maros

Jelen cikk két, homlokmarás során használatos forgácsoló lapka forgácsolási kísérletek segítségével végzett összehasonlítását mutatja be. A két lapka geometriájában nagyon hasonló, csak az él kialakításában tér el egymástól. Az összehasonlítás alapját a megmunkált felületek 2D érdességi jellemzői közül az amplitúdó paraméterek adják. A cél az, hogy megállapítsuk, hogy csúcsrádiusszal vagy fazettával kialakított forgácsoló lapkával kaphatunk e jobb eredményeket.

In electro discharge machining (EDM or spark erosion) the roughness of the machined surface plays a very important role in the applicability of the process. This paper deals with a comparative study of the electro discharge machining of tool steels based on the roughness characteristics of the machined surfaces. Another aim of the research is to investigate which tool materials (electrode material, copper, or graphite) are most effective to achieve the best possible surface microgeometry. Based on the data of the performed cutting experiments and the subsequent measurements, conclusions will be drawn regarding the machinability of the tested tool steels and the applicability of the electrode materials used.

Абразивно-струменева токарна обробка - це нова технологія для обробки циліндричних або осесиметричних деталей від твердих до конструкційних матеріалів. Одна із проблем гідроабразивного токарного обробляння полягає в тому, що реальна глибина різання зазвичай не дорівнює скоригованій радіальній глибині різання. Метою роботи є розробка математичного методу визначення реальної глибини прорізу. Цей метод заснований на рівності часу впливу струменя на зняття припуску і простому випробуванні на переріз, виконаному абразивно-рідинним струменем. Видалення матеріалу здійснюється струменем, що містить абразивний порошок, воду і повітря. Зусилля різання дуже малі при гідроабразивному різанні, що дає можливість обробляти деталі великої довжини і відносно невеликого діаметру. Цей процес підходить для обробки жорстких і важкооброблюваних матеріалів, таких як скло, кераміка, композити і різні надтверді матеріали або титанові сплави. Як показують дослідження, глибина різання не завжди визначається р...

Accuracy of abrasive waterjet cutting mainly depends on the form of cutting gap. It is very difficult to keep in hand the taper of the gap and produce almost parallel cut surfaces. There are a lot of parameters having effect on the gap. Results of a complex investigation have not been published in the literature. Taper can be different at different materials and depends on the applied technological parameters (feed rate, pressure, abrasive flow rate etc.). Some results of research work carried out on Ti6Al4V alloy related to the taper of the cutting kerf are explained in this paper, mainly from point of view of the load energy which effect to the surface of the workpiece during abrasive waterjet cutting.

1. Kulonfele sziliciumnitrid alapu keramiak dinamikus igenybevetellel szembeni es tribologiai viselkedesenek elmeleti es kiserleti tanulmanyozasa, a karosodasi folyamatok anyagszerkezeti hatterenek vizsgalata, a mechanikai, toresmechanikai es mikroszerkezeti jellemzők ill. a kopasi tulajdonsagok es az anyagtechnologiai parameterek kapcsolatanak vizsgalata 1.1. Műszerezett utővizsgalatok elektro-emisszios meressel kiegeszitve monolitikus es C-nanocsővel erősitett Si3N4 keramiakon ?- A KId meghatarozasa bemetszett es bemetszetlen probatesteken (statikus osszefuggesek, dinamikus kulcsgorbe modszer, fraktografiai modszer) ?- A KId sebessegfuggesenek elemzese ?- A dinamikus toresi folyamat jellemzese (toresi idő, toresi energia, toresi feszultseg) - Toretfeluletek fraktografiai vizsgalata (torest okozo hiba, toresi mechanizmusok) 1.2. Pin-on-disc kopasvizsgalatok, kulonfele mechanikai (kemenyseg-, szilardsagi, szivossagi) valamint mikroszerkezeti (EDS, Rtg. diffr.) es fraktografiai (SEM)...

Abrasive waterjet cutting is usually the first machining operation of different aluminium alloys from sheet metal. Quality of the machined parts and their later machining operations are determined by the accuracy of the cut, which highly depends on the taper of the cutting gap. Taper of the cutting kerf is one of the most important accuracy problems at abrasive waterjet cutting operations. Taper can be different at different materials and depends on the applied technological parameters (feed rate, pressure, abrasive flow rate etc.). Some results of cutting experiments for investigation of cutting kerf geometry are summarized in the paper when machining aluminium alloy material by abrasive waterjet cutting.

Az abrazív vízsugaras esztergálás egy új technológia a nehezen megmunkálható hengeres, vagy forgásszimmetrikus anyagok megmunkálására. Kétféle eljárás van elterjedőben: a tangenciális és a radiális módszer. A vízsugárral történő esztergálás egyik problémája, hogy a vágás valódi fogásmélysége nem egyezik meg a beállított értékkel. A radiális és tangenciális eljárás ugyanazon technológiai paraméterek beállítása esetén eltérő anyagleválasztást és felületminőséget eredményez. A cikkben egy alumínium ötvözet kétféle vízsugaras esztergálással megmunkált felületeinek érdességét hasonlítjuk össze annak érdekében, hogy megállapítsuk az egyes eljárások előnyeit, hátrányait és elsősorban egymáshoz való viszonyát.

Microgeometrical characteristics of the surface of engineering components operating in wear condition are important features influencing the wear process of the tribological system. Beside the widely used common 2D roughness parameters – e.g. the Ra, arithmetical mean roughness, Rz, ten point mean roughness, or Rmr, material ratio, etc. – the 3D roughness features (Sa, Sz Smr) provide potentially new means for geometrical description of the operating surfaces. Our paper aims at contributing an overview on the available 2D and 3D features, giving their definition and their potential use in multi-scale characterization of components used especially in wear type loading conditions. An interesting question is the relationship between the 2D and 3D roughness parameters and their information content, relating to tribological problems. Besides giving a systematic overview of the most important parameters applicable in wear analyses we also present examples of 2D and 3D roughness data determined on surface of nitrocarburised steels, as well as silicon nitride ceramics. A special emphasis is placed on those parameters which can be most efficiently used during wear damage analyses of ceramic materials.

Microgeometrical characteristics of the surface of engineering components operating in wear condition are important features influencing the wear process of the tribological system. Beside the widely used common 2D roughness parameters – e.g. the Ra, arithmetical mean roughness, Rz, ten point mean roughness, or Rmr, material ratio, etc. – the 3D roughness features (Sa, Sz Smr) provide potentially new means for geometrical description of the operating surfaces. Our paper aims at contributing an overview on the available 2D and 3D features, giving their definition and their potential use in multi-scale characterization of components used especially in wear type loading conditions. An interesting question is the relationship between the 2D and 3D roughness parameters and their information content, relating to tribological problems. Besides giving a systematic overview of the most important parameters applicable in wear analyses we also present examples of 2D and 3D roughness data deter...

Accuracy of abrasive waterjet cutting mainly depends on the form of cutting gap. It is very difficult to keep in hand the taper of the gap and produce almost parallel cut surfaces. There are a lot of parameters having effect on the gap. Results of a complex investigation have not been published in the literature. Taper can change at different materials and depends on the applied technological parameters (feed rate, pressure, abrasive flow rate etc.). Some results of research work carried out on AlMgSi0.5 alloy related to the taper of the cutting gap are explained in this paper, mainly from point of view of the load energy which effect to the surface of the workpiece during abrasive waterjet cutting.

Accuracy of abrasive waterjet cutting mainly depends on the form of cutting gap. It is very difficult to keep in hand the taper of the gap and produce almost parallel cut surfaces. There are a lot of parameters having effect on the gap. Results of a complex investigation have not been published in the literature. Taper can change at different materials and depends on the applied technological parameters (feed rate, pressure, abrasive flow rate etc.). Some results of research work carried out on AlMgSi0.5 alloy related to the taper of the cutting gap are explained in this paper, mainly from point of view of the load energy which effect to the surface of the workpiece during abrasive waterjet cutting.