"Teploty a nap\u011Bt\u00ED v j\u00E1dru kokily"@cs . "Temperatures and stress in the core mold"@en . . . . "5"^^ . . "978-80-7414-749-4" . "2"^^ . "\u00DAst\u00ED nad Labem" . "49924" . "\u010Cl\u00E1nek se zab\u00FDv\u00E1 odl\u00E9v\u00E1n\u00EDm p\u00EDst\u016F vyroben\u00FDch z hlin\u00EDkov\u00E9 slitiny. P\u00EDsty jsou odl\u00E9v\u00E1ny do ocelov\u00E9 formy s ocelov\u00FDm j\u00E1drem. Lit\u00ED se prov\u00E1d\u00ED gravita\u010Dn\u00EDm odl\u00E9v\u00E1n\u00EDm. Ka\u017Ed\u00FD stroj je vybaven dv\u011Bma kovov\u00FDmi formami, kter\u00E9 jsou p\u0159ed pou\u017Eit\u00EDm p\u0159edeh\u0159\u00E1t\u00E9 nad teplotou 160 \u00B0 C. Ocelov\u00E9 j\u00E1dro je tak\u00E9 p\u0159edeh\u0159\u00EDv\u00E1no plamenem. P\u0159i odl\u00E9v\u00E1n\u00ED se kovov\u00E9 formy a j\u00E1dra oh\u0159\u00EDvaj\u00ED. Teplota kovov\u00E9 formy se zvy\u0161uje a\u017E na 200 \u00B0C a teplota j\u00E1dra je vy\u0161\u0161\u00ED. Povrch j\u00E1dra je o\u0161et\u0159en nitrac\u00ED. Chlazen\u00ED forem a jader se prov\u00E1d\u00ED vodou. J\u00E1dro se p\u0159eh\u0159\u00EDv\u00E1 a jeho horn\u00ED \u010D\u00E1st nakonec p\u0159es jeho intenzivn\u00ED chlazen\u00ED vodou poprask\u00E1. \u017Divotnost cyklu j\u00E1dra se sn\u00ED\u017E\u00ED na p\u0159ibli\u017En\u011B 5-15 tis\u00EDc odlitk\u016F, co\u017E je pouze 15% \u017Eivotn\u00EDho \u010Dasov\u00E9ho cyklu j\u00E1dra k v\u00FDrob\u011B dal\u0161\u00EDch p\u00EDst\u016F. V tomto \u010Dl\u00E1nku je uvedena anal\u00FDza teplota jader." . "\u00DAst\u00ED nad Labem" . . "Univerzita Jana Evangelisty Purkyn\u011B v \u00DAst\u00ED nad Labem. Fakulta v\u00FDrobn\u00EDch technologi\u00ED a managementu" . "2014-10-08+02:00"^^ . "Soukup, Josef" . "RIV/44555601:13420/14:43886433" . "2"^^ . . . "Teploty a nap\u011Bt\u00ED v j\u00E1dru kokily"@cs . . . "Dynamika tuh\u00FDch a deformovateln\u00FDch t\u011Bles 2014" . "RIV/44555601:13420/14:43886433!RIV15-MSM-13420___" . "13420" . "Temperatures and stress in the core mold"@en . "Teploty a nap\u011Bt\u00ED v j\u00E1dru kokily" . . "[6498EB01EFAA]" . . . . "S" . . . . "The article deals with pistons casting made from aluminium alloy. Pistons are casting at steel mould with steel core. The casting is provided by gravity casting machine. The each machine is equipped by two metal moulds, which are preheated above temperature 160 \u00B0C before use. The steel core is also preheated by flame. The metal moulds and cores are heated up within the casting process. The temperature of the metal mould raise up to 200 \u00B0C and temperature of core is higher. The surface of the core is treated by nitration. The mould and core are cooled down by water during casting process. The core is overheated and its top part is finally cracked despite its intensive water cooling. The life time cycle of the core is decreased to approximately 5 to 15 thousands casting, which is only 15 % of life time cycle of core for production of other pistons. The temperature analysis of the core is presented by the article."@en . "Pistons, core, mould, heating, temperature analysis"@en . "Petrenko, Alena" . . "Teploty a nap\u011Bt\u00ED v j\u00E1dru kokily" . . "\u010Cl\u00E1nek se zab\u00FDv\u00E1 odl\u00E9v\u00E1n\u00EDm p\u00EDst\u016F vyroben\u00FDch z hlin\u00EDkov\u00E9 slitiny. P\u00EDsty jsou odl\u00E9v\u00E1ny do ocelov\u00E9 formy s ocelov\u00FDm j\u00E1drem. Lit\u00ED se prov\u00E1d\u00ED gravita\u010Dn\u00EDm odl\u00E9v\u00E1n\u00EDm. Ka\u017Ed\u00FD stroj je vybaven dv\u011Bma kovov\u00FDmi formami, kter\u00E9 jsou p\u0159ed pou\u017Eit\u00EDm p\u0159edeh\u0159\u00E1t\u00E9 nad teplotou 160 \u00B0 C. Ocelov\u00E9 j\u00E1dro je tak\u00E9 p\u0159edeh\u0159\u00EDv\u00E1no plamenem. P\u0159i odl\u00E9v\u00E1n\u00ED se kovov\u00E9 formy a j\u00E1dra oh\u0159\u00EDvaj\u00ED. Teplota kovov\u00E9 formy se zvy\u0161uje a\u017E na 200 \u00B0C a teplota j\u00E1dra je vy\u0161\u0161\u00ED. Povrch j\u00E1dra je o\u0161et\u0159en nitrac\u00ED. Chlazen\u00ED forem a jader se prov\u00E1d\u00ED vodou. J\u00E1dro se p\u0159eh\u0159\u00EDv\u00E1 a jeho horn\u00ED \u010D\u00E1st nakonec p\u0159es jeho intenzivn\u00ED chlazen\u00ED vodou poprask\u00E1. \u017Divotnost cyklu j\u00E1dra se sn\u00ED\u017E\u00ED na p\u0159ibli\u017En\u011B 5-15 tis\u00EDc odlitk\u016F, co\u017E je pouze 15% \u017Eivotn\u00EDho \u010Dasov\u00E9ho cyklu j\u00E1dra k v\u00FDrob\u011B dal\u0161\u00EDch p\u00EDst\u016F. V tomto \u010Dl\u00E1nku je uvedena anal\u00FDza teplota jader."@cs .