rr= :c C,

4

36

~ ~·~-J!-~F-4.<,/ ;ii ..L..l..JX_,/ -L.:.L...Qo:'.

5Ë

48

UNJVERSITE DE DAKAR- BACCALAUREAT DE L'ENSEIGNEMENT 00 2ad DEGRE

Durée: 2b Coef: Feuille n': 1/8 Format: A4

H G B

2 3 4

1. · TECHNOLOGIE GENERALE

'!\ , · ?.n se propose, dans c~tte épreuve de Technologie Générale, d'étudier un arbre d'une pompe à f/ ~ ·.,._ · piston d'une pelle mécanique (engin des mines).

•· . . ·.' ': :·,Matière de l'arbre est X8CrNil 8-9 dont le brut est obtenue par laminage.

Matériau

.1. Donner la signification de la dési~nation suivante: X8CrNi18-9. 1 pt

.. A.~M.:.~-t.t-e.m~v± .. .. ~t.~ . .e:\~.% .. a6.-.. ~~~ Y.\JL

.. ,dK.% .. le-.c&.~~~.J-... 1%.~ .~l~ ............... .............. . B

·························································••\•• ·············································· ·································,··· ··················································· 2.1 Par quel-moyen peut~on.augmenter la dureté de l'arbre? 1 pt

' _· . ..... ~ .~ .J;:;(~.~~~ ............... :·: .. ··· .. : ..... ; ........................................................... . . ······················ .. -·-············· ··· ······· ················································· ··········

C

D

2.t Av~ un ~chéma à l'app~i, expliquer le principe de l'application. 2 pts 1l n..;::_ .. U.l\' t.,l..~~ .. .. l,)'11.. ... . _. ........ .. <9~. ·················································

... ~ .M.\\.e..:t~~~r~ ............... ··············~ ··· .................... . A~3.:t:.~.Q~ .. ~i.d:W) ... ~+§o~... .......... eA,\ ............. .. . .. ~t::.tt~~................. ..... .! ................... .......... ..

~ -.... T.'.~.. ..~ .-.~ .. ·y:-~ ..... :.,_. ........... .!. .............................. . ... .. . . ... ~:l'\ ... O.*~·J..;._ ......... .. ... ...................... ]:; ........ .. . ~ . .. .. W~c.v... ............................. ....... , ...................... 1; .......... . ·······l .................................................................................. . ··································· ............ ................................................................................................ t ······················ ·························································································································

3. Apres avoir effectué sur la pièce un essai, on obtient les résultats suivants:

· HRC=64,

.3.1 De quel essai s'agit t-il? 1 pt '/;- c/_

A

B

C

D

E

.JLJ..a.pÏ.d,,,Rl11.Af .. ,k ... ........ tc. ....... !Y.!!ll .. g~~!'c ... 2M,.~').)X\.{L ... .. ~ .•........................................................ ... ................................ E

UNIVERSITE DE DAKAR- BACCALAUREAT DE L'ENSEIGNEMENT DU 2nd DEGRE

Durée: 2h F , --

Coef: TECHNOLOGIE GENERALE-AUTOMATISME

Feuillen°: 2/8 Format: A4 1 2 3

Série: Tl 1---------.1 F

1er Groupe Code: 2020 T 14 A 01

4

ww

1 2 3 4

3.2 Donner la valeur de la pénétration rémanente en mm. 2pts

...... BRt. .. :::-..... .. (¾. ..... =. ..... )~::-:: .. e. ........ .... e. .. T:?. . ..A00.:-: .. ~.4..::.~ .. ········ ::::. - ..... _ ...... -e_•···· ................. _ ................ .

.... S:. ......... ë\ëë·2.:····~ . e.c.. -c::-•• 3~····= ···;:;iOOL~ .. .. =.3ktç,IJO . ········································································································································· ...... ... ::. ... Qt'O.l .l .mm: ............................................................................................... .

B ·············································································································································· ·············································································································································· ···············································································································································

USINAGE 4. Calculer le temps Tc en'(seconde) <J..Ue fera la machine pour l'usinage simultané

des surfaces 2-3. (2pts) :\ ::=.'2--'Z-

C , Donerl Vc = t.O ; : ; f= 0,1 ~- ,s~,a~ 'L~ \ •":» -= ................................... -k,:::i-..,., ........... . 5 .. ....... Yf.. ...... ~~i~"· ......................... ........... ••5"·3i-•=il"i-•~e· .. ··· ........... .-:h.~ ... bb ... i,Q2 .. r te,.-=.. ... , ............................ ........................... ~~.. 1 48

o,A~lltt:>~~ ,;\:.,_-::- -i183 ::::\~,i~~ te.. --::a. <t C1';) x; ig3 :: Yi\l 'I'\ .

R.o-o,o ~- . te..-::. -;:z.A~~,lt-~~ 0

5. Une société spécialisée de la place désire réaliser la même pièce mais cette fois ci le brut

E

est en Cl 8. L'arbre est reproduit au rythme de 200 pièces par mois pendant deux ans.

5.1 Choisir une machine outil appropriée pour la réalisation de la phase 200 des surfaces:

(1-2-3-4-5-6-7) (1 pt) ... ~L,U:-r));U.:~.~m,q..U:~.~···T~~ .. ~\,.~Jk.~~R~Yg.~.T~.i;C .. ç. N 5.2 Pour la même phase quel type de montage sera appropriée pour la réalisation de ces

surfaces. (1,5 pts) ( 'l\).Q~'To.,~ .. -!11,!\ ••• l.ik. .. .. . ...... . .... . ... .... ... ..... .. . .... ..... . . .. ..... . ... . ··············································································································································· ···············································································································································

UNIVERSITE DE DAKAR- BACCALAUREAT DE L'ENSEIGNEMENT DU 2nd DEGRE

,F Durée: 2 h TECHNOLOGIE GENERALE-AUTOMATISME Série: Tl Coef: 1er Groupe

Format: A4 -E3- Code: 2020 T 14 A 01

1 2 3 4

A

B

C

D

E

F

A

B

C

D

E

1 2 3 4 6 - 1 Proposer une machine outil approprié épondant au type de production effectué par cette .... ï.t:.:::::&:;~~'tï.~(.'..~1-....................................................... .

············································································································································· 6.2 Représenter partiellement l'outil en position d'usinage sur les deux vues en indiquer

Mc et Mf. (2p~) ·

~i A-A

1----#----

< MÎ Au regard de la spécification

rcc o,lfro 7.1 Donner le nom de la machine utilisée; et justifier (1 pt)

... f<,~t1:Jf.eu.u.. .... c,1-t.11.dr..1.F ····· .. ····· ....................................................... . 7.2 Pryciser l~ nom de l'outil. (1 pt) .. ... l. .. auli.l ... m . .w...-t;;. .................... ; ....................................................................... . 8. Dans le cadre d'un travail unitaire, le taillage des cannelures sur cette arbre est effectué en fraisage par une fraise de forme.

8.1 Citer l'outillage nécessaire, utilisé pour la réalisation des cannelures. (1,5 pts) f! ' J I •./.g_ t ,. H."J.~ f T '.. rM t .. {;;t.l.V.tJ.eur: .. .-:~.JJJMl.l.NII} . r.. .. e.../' ... ... ~,l'r.ffk ... --:: ... UO.~/ . . 1.1. &fil Ve..

············································································································································· ············································································································································· 9. Quel est l'intérêt de la gorgt@.ors de la réalisation du filetage {f)? (1 pt)

.. ~rm~ ... h ... J½s~···~ ·R.~t)Jlt ... .. .. & .. r~·~~. · ································· ·········································································································· 10. Quel est le diamètre de perçage du trou tarauder M12 x 1,75 ? (l pt)

... ... .. .ÀZ.:::.At:t;Ç···= ·····AP.t?.C1t1m ..... . ········ ············ ······················································································································ ··········································································································································

UNIVERSITE DE DAKAR- BACCALAUREAT DE L'ENSEIGNEMENT DU 2nd DEGRE

A

B

C

D

E

Durée: 2 h Série : Tl J .b--C-o-ef-.. ----J TECHNOLOGIE GENERALE-AUTOMATISME 1-----~---.J F Ier Groupe

Feuillen°: 418 Format: A4 -E3- Code: 2020 T 14 A 01

1 2 3 4

1 2 1 3 1 4

II. AUTOMATISME

A Partie 1 A

>-

Vous devez concevoir un système de sécurité d'une salle des coffres d'une société minière pour

le stockage des lingots d'or.

Le cahier des charges est établi comme suite:

Trois serrures doivent ouvrir la porte (L) de la salle des coffres. Les serrures sont reliées à.un circuit électrique, et chacune sera déverrouiller par une clé qui sera différente des autres .

B 3 Conditions sont possible pour ouvrir la porte:

C

-J-

D

E

1ère condition : le directeur général de la société (A) peut ouvrir la porte, seul ;

2ème condition : à l'absence du directeur, deux employeri(B et C) peuvent ouvrir la porte ;

3ème condition : les trois personnes le directeur (A) et ses deux employer (B et C) peuvent ouvrir la porte.

1. Remplir la table de vérité. (1 pts)

A B C L 0 © 0 0 6' ô '1 Ci)

e, 1 V 0 Q -1 4 -1 -1 0 1 1 Cl) 4 1 1 1 CO ·1

2. Ecrire l'équation logique de L. (1 pts) ·1, 1 1 1 ········································"·"··········································•·""'''"'' '''''''' ''''''''"'''''''''' ''''' .. L.-~ .... B .... (: . .t..A.:t .A.!.Ç.:~ .. A..~.B .. ± .. -A.~.B.~ .. .... .................................... ..... .

. .lA .. t..C..+.~.t.i.~ .. ~) ............................ ... ..................... . L 12 c_ h. == ,\ .......... ";; ..... \?.~ ......... + ... a ....................................................................................... ........... .

············--······························································································································ ·· ···························································· ········ ··· ··· ··············· ·· ········· ··· ···········································································································································

UNIVERSITE DE DAKAR-BACCALAUREAT DE L'ENSEIGNEMENT DU 2nd DEGRE

-

.., Duree: 2 h Série: Tl 4'. TECHNOLOGIE GENERALE-AUTOMATISME

Coef: 1er Groupe Feuille n°: 5/8 Fonnat: A4 1 tj Code: 2020 T 14 A 01

1 1 2 3 1 4

B

C

>-

D

E

F

B

C

D

E

2 3 1

4. Faire le logigramme de la fonction logique de L simplifié. (lpts)

A B C

5. Dresser le circuit électrique de la fonction de L. (l,Spts)

Ph

A

4

N

6. On suppose que L= AD+ BC, faire le chronogramme de la fonction deL. (l,Spts)

1 A

0

B 1 0

C 1 0

1 D

0 _______ ...__ _ _, ______ _ _ ______ ..___

1 s

0 _J _______ J __ ( _______ l_.D __ O _____ .,

UNIVERSITE DE DAKAR-BACCALAUREAT DE L'ENSEIGNEMENTDUlnd DEGRE

Durée: 2 h TECHNOLOGIE GENERALE-AUTOMATISME Série: Tl Ier Groupe

Format: A4 -E3- Code: 2020 T 14 A 01

1 2 3 4

A

B

C

D

E

F

A

B

C

D

E

2 3

Partie 2

a0.b1 .c0.m

a+

a1.p

b-bO

c+ c1

b+ c-b1.c0

a-

1. A partir du grafcet ci-dessus, compléter le tableau d' activation et de

désactivation du séquenceur. (4pts)

Etapes Activations Désactivations 0

4

2. Faire le cablage du séquanceur sachant que les vérins sont pilotés par des distributeur 5/2. 8 ts

UNIVERSITE DE DAKAR- BACCALAUREAT DE L'ENSEIGNEMENT DU 2nd DEGRE

A

B

C

D

E

Durée: h Série: .'Ei-----~ TECHNOLOGIE GENERALE-AUTOMATISME t--------1 F Coef: 1er Groupe Feuillen°: 7/8 Format: A4 -El- Code: 2020 T 14 A 01

1 2 3 4

[!> n, c:, "' ' >

1 Ill. SCHEMA DE CABLAGE 1

A C B

... .J" cO 4

~c1 ~-p r

$

• w

'-li 3

( J

~k ~ -- J 1 1

-< $

··~ rh a,

"~ ·N r~ f 'd) 'D1 Co 11'\

UNIVERSITE DE DAKAR· BACCALAUREAT DE L'ENSEIGNEMENT DU 2ad0EGRE

Durée: 2h Coef: Feuilleo0 :MI Format: A4 · - _;_;..__- ,: - - - .-.., -8

H G

Ier Groupe -;1 1 :2°Tl4A~