Cutting tool life tests of ceramic inserts for car engine sleeves

Ovaj članak je usredotočen na eksperimentalno određivanje trajnosti alata za indeksiranje keramičkih reznih uložaka. Postavljen je kriterij trošenja alata VBBmax = 0,6 mm (sukladno ISO 3685) ili 30 komada obrađenih tuljaka. Kada je postignut barem jedan od ovih parametara, ispitivanje je zaustavljeno i procijenjeno. Ispitivane su dvije vrste reznog materijala uz pomoć tvrtke Saint Gobain Advanced Ceramics s.r.o. – ZTA 7 NI i D 250. Pratili smo njihovu trajnost kod istih parametara obrade. Eksperimenti su izvedeni na alatnom stroju – CHEMNITZ NILES N22. Obrađivani materijal bio je lijevano željeza 25P koje se koristi za motore automobila. Trošenje alata praćeno je za svaki peti obrađeni tuljak. Mjerena je mikrogeometrija nakon ispitivanja trošenja alata na svakom petom tuljku. Cilj je bio odrediti aritmetičku toleranciju Ra profila, najveću visinu Rz profila i vanjski promjer D. Mjerenje je provedeno četiri puta, aritmetička sredina je izvedena naknadno i prikazana je u tablicama.This article is focused on the experimental determination of tool life tests for indexable ceramic cutting inserts. The set criterion of tool wear was VBBmax = 0,6 mm (in accordance with ISO 3685) or 30 pieces of machined sleeves. After at least one of the mentioned parameters was achieved, the tests were stopped and evaluated. Two types of cutting material by Saint Gobain Advanced Ceramics s.r.o. Company – ZTA 7 NI and D 250 were tested. We monitored their tool life at the same cutting parameters. The experiments were performed on machine tool – CHEMNITZ NILES N22. The machined material was the cast iron 25P mainly used for car engines. Tool wear was monitored on every fifth machined sleeve. Microgeometry was measured after tool wear test on each fifth sleeve. The aim was to determine the arithmetic tolerance of Ra profile, the greatest height of Rz profile and the external diameter D. The measurement was carried out four times; arithmetic average was performed subsequently as it is shown in the tables

Conservancy in International Conventions and in Praxis on the Slovak Republic Model

101 s., 9 s. příl. :obr., tab., grafy +CD ROMTato Diplomová práce se zaměřuje na problematiku zavádění mezinárodních dohod a úmluv, zejména legislativy Evropské unie, do národní legislativy konkrétního člena společenství. Sleduje výši vynaložených finančních prostředků z veřejného rozpočtu Slovenské republiky a ze zdrojů Evropské unie do oblasti životního prostředí, jež jsou potřebné k sjednocení zákonů a nařízení s těmi, které jsou platné v rámci Evropské unie. Analyzuje, zda je praxe v této oblasti v souladu s evropskou legislativou a zda je možné efektivněji čerpat finance z dotací EU a ze soukromého sektoru. Přínosem této Diplomové práce je výzkum a konfrontace výsledků průzkumu mezi institucemi odpovědnými za zavedení a dohled nad legislativou o ochraně životního prostředí a podniky, které se velkou měrou podílejí na znečišťování životního prostředí v rámci Slovenské republiky. Průzkum proběhne formou dotazníkového šetření. Pomocí analýzy výsledků bude hledat konsensus mezi oběma zúčastněnými stranami, zejména v otázce optimálního poměru výdajů finančních prostředků v rámci do této oblasti

Ispitivanje trajnosti reznog alata keramičkih uložaka za tuljke automobilskih motora

This article is focused on the experimental determination of tool life tests for indexable ceramic cutting inserts. The set criterion of tool wear was = 0,6 mm (in accordance with ISO 3685) or 30 pieces of machined sleeves. After at least one of the mentioned parameters was achieved, the tests were stopped and evaluated. Two types of cutting material by Saint GobainAdvanced Ceramics s.r.o. Company – ZTA7NI andD250 were tested.We monitored their tool life at the same cutting parameters. The experiments were performed on machine tool – CHEMNITZ NILES N22. The machined material was the cast iron 25P mainly used for car engines. Tool wear was monitored on every fifth machined sleeve. Microgeometry was measured after tool wear test on each fifth sleeve. The aim was to determine the arithmetic tolerance of profile, the greatest height of profile and the external diameter . The measurement was carried out four times; arithmetic average was performed subsequently as it is shown in the tables.Ovaj na eksperimentalno trajnosti alata za indeksiranje reznih uložaka. Postavljen je kriterij trošenja alata = 0,6 mm (sukladno ISO 3685) ili 30 komada tuljaka. Kada je postignut barem jedan od ovih parametara, ispitivanje je zaustavljeno i procijenjeno. Ispitivane su dvije vrste reznog materijala tvrtke Saint Gobain Advanced Ceramics s.r.o. – ZTA7 NI i D 250. Pratili smo njihovu trajnost kod istih parametara obrade. Eksperimenti su izvedeni na alatnom stroju – CHEMNITZ NILES N22 lijevano željeza 25P koje se koristi za motore automobila.Trošenje alata je za svaki peti tuljak. Mjerena je mikrogeometrija nakon ispitivanja trošenja alata na svakom petom tuljku. Cilj je bio odrediti toleranciju profila, visinu profila i vanjski promjer . Mjerenje je provedeno puta, je izvedena naknadno i prikazana je u tablicama