transmiterea miscarii 7b.pdf
TRANSCRIPT
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Elemente si siteme de transmitere a miscarii pentru masini-unelte
Transmisii cu curele
Clasificare:
-curele late ( mai rar folosite)
-curele trapezoidale
-curele poli V
-curele dintate
Curele trapezoidale
2
1
1
2
D
D
n
ni
Limitari constructive din considerente de : gabarit, uzura, lungime etc.
Pentru puteri mari se pot monta mai multe
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Se intind mai greu si necontrolat
Curele poli V
Pentru puteri mari si foarte mari. In L.C.P.
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Curele dintate
Jocuri nule
Mai ales in L.C.A.
In ultimul timp se folosesc si in L.C.P.
Transmisii cu lant
Mai rar. Se intalnesc la unele transmisii pentru L.C.aux. (magazine de scule).
Transmisii cu roti dintate
In ultimul timp din ce in ce mai putin intalnite.
Avantaje: puteri mari, se poate schimba planul de lucru, uzura redusa.
Dezavantaje: jocuri de intoarcere, zgomaot, pret, necesita ungere.
2
1
2
1
1
22
M
M
z
z
n
ni
In majoritatea cazurilor reduc turatia si maresc cuplul. Se fac din otel, rectifiacte, precizie
ridicata. Se recomanda realizarae lor prin rulare ( NU divizare).
Calculul:
i- [-] considerente cinematice,
m- modulul [mm.] din considerente de cuplu (putere)
B-latimea [mm.] din considerente de cuplu.
Clasificare:
-roti dintate cilindrice , cu dinti drepti, inclinati sau in V
-roti dintate conice, cu dinti drepti, inclinati sau dupa anumite curbe. Pot fi la 90o dar si la
alte unghiuri.
Dintii inclinati mai greu de realizat dar au zgomot redus, portanta ridicata. INTRODUC
EFORTURI SUPLIMENTARE.
Profilul uzual este cel EVOLVENTIC.
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Cateva elemente geometrice pentru definirea angrenajelor
Dantura nedeplasata
zmDD
mDDDi
5.2
mDDDE
2
Dantura deplasata
zmDD
mDDDR
2
mDDRi
5.2
mDDRE
2
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Semifabricatul: laminat sau forjat.
Piesele scumpe se pot face din doua bucati.
Mai ales la transmisiile melc-roata melcata.
z
qi
De obicei ~1/40
Cuplaje specifice pentru MU
Pentru L.C.A jocurile trebuie sa fie nule
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Cuplaj rigid
La suruburile cu bile
Cuplaj rigid pentru traductoarele de rotatie
Cuplul transmis este redus
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Cuplare rigida(fara jocuri)
1,2-arbori, 3-cuplaj, 4-piese de strangere, 5-surub, 6-saiba.
Cuplaje cu elemente deformabile
1-arbore, 2-roata dintata, 3-piesa de strangere, 4-surub, 5-saiba.
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Elemnte si sisteme de transmitetre a miscarii la un strung normal CNC
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Curele poliV la un strung vertical
Sistem de intindere a curelelor
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Curele dintate folosite la un strung vertical (LCP)
Montajul curelelor dintate
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Roata de curea dintata intr-un lant cinematic principal( AFP 200 Pama)
Vedere frontala pentru un strung CNC la care se pot identifica elemntele si sistemele de
transmitere a miscarii
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Vederea laterala
Vederea de sus
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Intinderea curelelor dintate
Transmisie cu curele dintate de forta
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Tipuri de curele dintate
Angrenarea roata-curea
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Montarea corecta a rotilor pentru curele dintate
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Roti de curea dintata obtinute prin debitare
Elemente geometrice pentru curele trapezoidale
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Elemente geometrice pentru curele dintate
Elemente geometrice pentru transmisiile cu curele dintate
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Angrenarea rotilor dintate cilindrice cu dinti drepti
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Cremaliera de referinta
Cota peste „n” dinti Verificarea unei roti dintate
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Roti dintate cilindrice cu dinti inclinati
Roti dintate cilindrice cu dantura interioara( dreapta si inclinata)
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Angrenaj conic 1
Angrenaj conic 2
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Angrenaj conic 3
Angrenaj conic 4
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Angrenaj conic 5
Angrenaj cu axe neparalele ( cu toti dintate cilindrice )
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Angrenaj melc-roata melcata
Arbore intermediar SC 1
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Arbore intermediar SC2
Pinion de atac la SC BERTHIEZ
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Cutie de viteze Centru de prelucrare
Angrenaj conic in CV
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Transmisie cu curea dintata la un reductor cu doua pinioane si preluare de joc
Reductor melc-roata melcata la un SC
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Ungerea cutiilor de viteze
Coroana dintata la un SC43 cu LCA pentru frezare
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Coroana dintata
Cutie de viteze MORANDO 1
Cutie de viteze MORANDO 2
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Elemente moderne de transmitere a miscarii
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Transmisii pinion-cremaliera