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Tehnologia Vinului
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Proiectarea procesului procesului tehnologic optim optim de realizare a piesei “Arbore II “ in conditiile unui numar necesar de bucati n= 20.000 buc/an.
Se vor parcurge etapele: 1.Stabilirea rolului functional al piesei folosind analiza morfofunctionala a suprafetelor 2.Alegerea materialului optim pentru confectionarea piesei 3.Stabilirea procedeelor posibile de realizare a piesei-semifabricat 4.Obtinerea piesei-semifabricat printr-un procedeu tehnologic de turnare 5.Obtinerea piesei-semifabricat printr-un procedeu de deformare plastica 6.Analiza tehnico-economica tehnico-economica a doua ariante de proces tehnologic si determinarea ariantei optime de obtinere a piesei-semifabricat !.Succesiunea logica a tuturor operatiilor necesare obtinerii pieseisemifabricat prin procedeul optim ".Succesiunea logica a tuturor operatiilor si fazelor necesare obtinerii piesei finite
.Stabilirea rolului !unctional al piesei !olosind
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Stabilirea rolului functional al piesei se face folosind analiza morfo functionala a suprafetelor. Aceasta metoda de analiza constituie un bun instrument pentru indeplinirea obiectielor propuse si se bazeaza pe studiul fiecarei suprafete in parte din toate punctele de edere. #etoda de analiza morfofunctionala a suprafetelor presupune parcurgerea urmatoarelor etape$ o
"escompunerea piesei in supra!ete cat cat mai simple %ezi fig.1&
#otarea tuturor supra!etelor ce delimiteaza piesa in spatiu spatiu %ezi fig.1& o
Analiza !iecarei supra!ete in parte parte ' s-a analizat fiecare suprafata in parte din urmatoarele puncte de edere$ forma for ma geometrica a suprafetei( dimensiunile de gabarit( precizia dimensionala( precizia de forma( precizia de pozitie( rugozitatea rugozitatea si duritatea. )ezultatele )ezultatele analizei sunt sunt trecute in tabelul 1. o
Intocmirea unui tabel S$P%A&'(') *A%A*('%IS(I*I ' reprezinta o sinteza a tuturor conditiilor tehnice de generare a fiecarei suprafete a piesei. *ste prezentata in tabelul 1. o
“
”
Stabilirea tipului si rolului rolului !unctional posibil al !iecarei !iecarei supra!ete - in functie de proprietatile si abaterile fiecarei suprafete in parte pot e+ista suprafete$ functionale, tehnologice, tehnologice, de asamblare, au+iliare. au+iliare. o
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#etoda folosita pentru alegerea materialului optim se numeste metoda de analiza a alorilor optime si are la baza alorificarea la ma+im a intregului ansamblu de proprietati functionale( tehnologice si economice. entru rezolarea acesteia trebuiesc rezolate urmatoarele etape$ stabilirea rolului functional al piesei( a tehnologicitatii constructiei si a conditiilor de functionare ale acesteia. Aceasta etapa s-a rezolat la punctul precedent. o
determinarea si stabilirea factorilor analitici ai problemei alegerii materialului optim $ se face luand in considerare intregul ansamblu de proprietati functionale( tehnologice si economice. o
descompunerea factorilor analitici in elemente primare. oti factorii primari sunt prezentati intr-un tabel “ +ateriale)Proprietati“ de forma celui prezentat in tabelul 2. o
aprecierea calitatia a factorilor analitici $ aceasta se face folosind un sistem de notare in functie de aloarea fiecarei proprietati k acordandu-i-se o nota tk in functie de precizia care se rea obtinuta. o
stabilirea ponderii importantei fiecarui factor primar se face tinand cont de datele rezultate din etapele precedente ( acordand fiecarei proprietati k o pondere dk. 8n stabilirea ponderii trebuie indeplinita conditia$ ∑dk = 1 o
alegerea solutiei optime la momentul dat $ se face aplicand criteriul$ ,t-d- o
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abel 2. Alegerea materialului optim
.Stabilirea procedeelor posibile de realizare a piesei)semi!abricat piesei)semi!abricat
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entru a stabili procedeele tehnologice posibile de obtinere a piesei se a face o analiza a tehnologicitatii pieselor-semifabricat turnate( forDate si matritate. 8ndicarea unuia sau a altuia dintre procedeele tehnologice de obtinere a semifabricatului este conditionata si de factori economici. Obtinerea unor semifabricate cu forma si dimensiuni apropiate de piesa finita este mai scumpa ca cea a semifabricatelor mai putin precise. Eolumul productiei este si el un factor important in alegerea procedeului de obbtinere a semifabricatului. Astfel( cu cat numarul de piese este mai mare cu atat cheltuielile ce rein pe bucata or fi mai mici. 9a productia de serie mare sunt indicate procedee prin care sa se obtina semifabricate cu forme si dimensiuni apropiate de cele ale piesei finite( cu tolerante stranse( deci cu adaosuri de prelucrare mici( iar in productia de seria mica acesti factori nu mai sunt de prima importanta.
.. btinerea piesei)semi!abricat prin turnare urnarea reprezinta un procedeu clasic de obtinere a semifabricatelor ce pot aea forme de la cele mai simple la cele mai comple+e( in productie de unicat( serie serie sau masa. /in studiul tehnologicitatii tehnologicitatii pentru turnare se constata ca piesa respecta recomandarile priind tehnologicitatea pieselor-semifabricat turnate cum ar fi$
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solicitarilor o un numar mic de operatii un utilaD mai simplu si mai ieftin o o durata de realizare a semifabricatului este scurtata e langa aceste aantaDe trebuie aut in edere si unele dezaantaDe si anume $ rezistenta este mai mica rebuturilor creste datorita unor defecte de turnare o pericolul rebuturilor greu de inlaturat. o
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iesa-semifabricat poate fi obtinuta si printr-un procedeu de deformare plastica( deoarece indeplineste indeplineste conditiile impuse impuse de tehnologicitatea tehnologicitatea pieselor-semifabricat forDate si matritate( matritate( cum ar fi $ modificarea configuratiei geometrice a piesei-semifabricat obtinuta prin forDare libera poate fi facuta astfel incat adaosurile de prelucrare( tehnologice si de debitare sa fie minime o razele de racordare ale muchiilor e+terioare pot fi alese cat mai mici( pentru ca pierderile de material indepartat prin aschiere si manopera sa fie reduse o forma constructia a piesei-semifabricat rezultata permite obtinerea gradului ma+im de apropiere de piesa finite o
8n realizarea unui semifabricat obtinut prin deformare plastica( o conditie esentiala este repartizarea corespunzatoare a fibrelor de curgere a materialului( de-a lungul acestuia.
.. btinerea piesei)semi!abricat prin aschiere
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Asa cum s-a stabilit la punctul anterior o arianta acceptabila de obtinere a piesei-semifabricat pentru piesa data o constituie turnarea in fome temporare din amestec de formare obisnuit( realizata manual. entru turnarea in forme temporare aantaDele constau in costuri in costuri relatie scazute ale materialelor folosite % nisip( argila( apa( modele( samd & si calitate conforma cu cerintele de productie. regatirea formei de turnare( in ederea umplerii cu metal( constituie una din cele mai importante tehnologii din ansamblul procesului de fabricare a piesei turnate. rocesul tehnologic de obtinere a pieselor prin turnare in forme temporare poate fi structurat pe urmatoarele etape distincte $ realizarea modelului si a cutiilor de miez( pe baza desenului piesei turnate sau a desenului de e+ecutie a modelului si a cutiilor de miez realizarea formei de turnare si a miezurilor( asamblarea o formelor o elaborarea aliaDului( transportul si alimentarea formelor tratamentele aplicate la umplerea formei( solidificarea piesei o o dezbaterea formelor( e+tragerea piesei solidificate si scoaterea o
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turnare si suprafata de separare a acesteia trebuie sa asigure$ calitatea solicitata a piesei turnate( consumuri minime pentru realizare si prelucrare mecanica. alegerea planului de separatie sepa ratie $ pentru e+tragerea modelului din forma( acesta se sectioneaza in doua sau chiar mai multe bucati. 8n general( la alegerea planului de separatie sunt posibile mai multe solutii. /intre solutiile posibile se alege cea care permite$simplificarea la minimum a constructiei modelului care urmeaza sa fie e+ecutat din cat mai putine parti componente, e+tragerea usoara a piesei din forma, suprafata de separatie a formei trebuie sa fie pe cat posibil plana si una singura, obtinerea formei cu cele mai putine miezuri o
stabilirea stabilire a adaosurilor adaosu rilor de prelucrare prelucra re $ adaosurile de prelucrare se pread pe toate suprafetele piesei ale caror precizii dimensionale si rugozitati nu pot fi obtinute prin turnare. o
stabilirea stabilire a adaosurilor adaosu rilor de inclinare inclina re $ deoarece modelul trebuie e+tras din forma( se admite ca peretii perpendiculari pe planul de separatie sa fie construiti cu inclinari( asa-numite inclinari constructie( chiar daca nu o
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0onstructia desenului modelului se face pornind de la desenul piesei brut turnate( care se completeaza cu adaosurile de contractie si cu marcile pentru sustinerea miezurilor( daca piesa prezinta goluri interioare. #odificarea olumului si( implicit( a dimensiunilor( care are loc la incalzirea sau racirea aliaDelor metalice( nu poate fi eliminate( ea aand loc ca urmare a proprietatilor fizice( specifice fiecarui aliaD. Aceasta modificare de olum poate si trebuie sa fie compensate sau diminuata in cadrul proiectarii tehnologiei de turnare prin aplicarea adaosului adaosului de contractie. contractie. #odelele nu se pot construi absolute e+acte( conform cotelor de pe desen( oricata atentie s-ar acorda la confectionarea lor. 8n plus( urmarirea construirii unui model deosebit de precis mareste pretul de cost in mod neDustificat. /e
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1.btinerea piesei)semi!abricat printr)un procedeu de de!ormare plastica /eformarea plastica este metoda de prelucrare dimensionala prin care( in scopul obtinerii unor semifabricate sau produse finite( se realizeaza deformarea permanenta a materialelor fara fisurare( prin aplicarea fortelor e+terioare. ehnologiile de deformare plastica constituie metode importante de obtinere a pieselor( ce prezinta aantaDe fata de alte procedee de
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/esenul piesei brut matritate se intocmeste pe baza desenului piesei finite la care se pread adaosurile de prelucrare( adaosurile tehnologice( adaosurile de inclinare si razele de racordare. r acordare.
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3.Analiza tehnico)economica tehnico)economica a doua variante de proces tehnologic tehnologic si determinarea determinarea variantei variantei optime de obtinere a piesei)semi!abricat piesei)semi!abricat
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o o o
F2 sunt cheltuielile fi+e V2 sunt cheltuielile ariabile n este numarul de bucati din lot
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8n ederea obtinerii piesei-semifabricat prin matritare trebuiesc parcurse urmatoarele etape$
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Trusted by over 1 million members
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.