numerika ek1 fsb
TRANSCRIPT
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ISPITZ)ELEMENTI ONSTRUKCIJA(VijdanaPresaprsten debljine30T124x6(P3).
(prikazan a slici)sluzizamm uz pomodokretanjaupreiavanje epapromjera 4 mm -vijaanogvretenas desnlmnavoJem
Potrebnoe izradunati:'!. Fotrebnuiluupregavanjaepa uzpretpostavljenipecifiini odirni ritisakizmeatuepa prstenapop b0Nimm'z'aktor renja rianjanja steznom pojul= 0,135sigurnoststeznompoju = 12. Minimalnuiainu atidnogijela odiliceretena 'uzpoznatiopustenipritisak navoju retena reiep6oo 6,8 N/mm'zteaktor renjau navojuvijdanogretenal,,R0,12 vretena podlogulipoo0'15.s. potrennuudnu iluna krajevimaoluge iB za okretanjeretenaijekomupresavanja.4. S koliko eokretaja ora akrenutivretenoreseijekompregavanja(radunajuiiaseposlizekupnauljinapreiavanjateznogpola)s. bimenzi;eprirubnihijaka kojiosiguravajupoj onstrukcijerese njezinimpodnozjem,kosu vijci zradeni metrijskimavojemz materijalavalitete 6uzpredvidenuigurnostodnosu agraniculastidnostiaterijalad3'2
Napomna2a izradu: U riesenjuzadatka reba predoditi jelokupan ostupakprora'unapotkrijeplje;kicama.oted p6ihzraiamorabitinapisanzrz uvrstenimroidanimrijednostimaelidinairezultat. bavezno emora aznadilibroiitanjaojese rjeSava
Tr 24x6{Pl)
Vrijemea zradu: sat 30 min.
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ISPIT z >ELEMENTIKONSTRUKCIJA K\/Pokretanjeadnogstola '1)alatnog troja,po ravnimkliznim odilicama, rsiseokretanjem ijdanogvretena 2) pomoeu udiceR. Za sigurnopokretanje tola sepretpostavlja,a e silau vretenu e6aza 20o/o d sile trenjau vodilicamaadnog tola.
Matica ijdanog retena3) e u steznom poju radnim tolom prema rikazu a skici).Pri kretanju tola,prstenovi4) preuzimajuksijalnu ilu u vretenu, trenjeprstenovapodlogu e ostvaruje asrednjemromjerusr 42 mm,uz aktor renja p= 0,12.
Poznati u slijede6iodaci:- optere6enjeadnog tolaQ= 45 kN- faktor renjau vodilicamaadnog tolap = 0,1' - malerijal idanog retena r 32x 6 (P3)e kvelitete .6- dopustena vrsto6amaterijala ijdanog retena znosi l/3 avrstoee a granicielasti6nosti- faktorrenjau navojimaretena v.=0,1 - .- duljina raka udiceR, za okretanje retena = 530mm- promjermatice ijdanogretena rr= 60 mm- potrebnaigurnostteznog poja $= 2- faKor renjau steznom pojupsr 0,15 -- dopuiteni ritisak steznompoju d= 30 N/mm'TREBA ZRAEUNATI;
1. Sigurnostvijdanomretenuul- F"If '.^r,.'*l'rtr lJ
2. Rudnu iluFR. a rudiciR, potrebnua okretanje ijdanog retena3. Duljinu teznog pojab4. Pritisak navojima atice retena3)
Vrijemea zradu: sat 30min.
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