DO an (1phan Nhap)

8/2/2019 DO an (1phan Nhap)

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n c s thit k my_____

Sv th c hi n: Nguy n n

TR

N C

TI: THIT

Sinh vin thc hi

Lp

M sinh vin

Gio vin hng

H

__________________________________ H thng d

Thi

NG I HC IN LC H NIHOA CNG NGH C KH

S THIT K

H THNG DN NG THN

n : NGUYN NH THI

: 4-C in T

: 108090132

n : ThS. NGUYN MNH TI

i, Ngy Thng Nm 2012

n ng thng trn

1

Y

G TRN


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n c s thit k my_______________________________________ H thng dn ng thng trn

Sv th c hi n: Nguy n nh Thi 2

N C S THIT K MY

TI

s 5: THIT K H THNG DN NG THNG TRN

Phng n s:01

H thng dn ng thng trn gm:

1- ng c in 3 pha khng ng b;2- B truyn ai thang;3- Hp gim bnh rng tr 2 cp ng trc;

4- B truyn xch ng con ln;5- Thng trn.

S liu thit k:Cng sut trn trc thng trn, P=6, 5 (kw);

S vng quay trn trc thng trn, n=42 (v/ph);Thi gian phc v, L=6 (nm);Quay mt chiu, lm vic hai ca, ti va p nh(1 nm lm vic 250 ngy, 1 ca lm

vic 8 gi).

Ch ti: T1 = T ; T2 =0,85T ;t1=28 giy ; t2=60 giy.


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YU CU- 01 thuyt minh;bn v lp 3D ca h thng; 01 bn v lp (bn in); 01 bn v

chi tit; cc file tnh ton v kt qu.

- Tt c d liu c la vo 1 a CD

NI DUNG THUYT MINH1. Tm hiu h thng truyn ng my;

2. Xc nh cng sut ng c v phn b t s truyn cho h thng truyn ng.

3. Tnh ton thit k cc chi tit my:

- Tnh ton cc b truyn h (ai , xch hoc bnh rng);- Tnh cc b truyn trong hp gim tc (bnh rng, trc vt);

- V s lc tc dng ln cc b truyn v tnh gi tr cc lc ;- Tnh ton thit k trc v then;

- Chn ln v ni trc;

- Chn thn hp, bu lng v cc chi tit ph khc;

4. Chn du bi trn, bng dung sai lp ghp;

5. M phng chuyn ng ca b truyn (bng Inventor);6. Ti liu tham kho.


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LI NI U

Sinh vin thc hin:

Nguyn nh Thi


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NHN XT CA GIO VIN HNG DN

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H Ni, Ngy Thng Nm 2012

Gio vin hng dn:


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PHN I : CHN NG C V PHN PHI T S TRUYN

1.1 Cng sut cn thit

Gi P l cng sut tnh ton trn trc my cng tc ( KW )

Pct l cng sut cn thit trn trc ng c ( KW )

l hiu sut truyn ng.

Ta c: = (1)

Trong : - h s ng tr.

= d..2br.

4ol.x

d = 0,95 Hiu sut b truyn ai

br= 0,97 Hiu sut b truyn bnh rng

ol = 0,99 Hiu sut ca mt cp ln

x = 0,95 Hiu sut b truyn xch ng con ln.

= 0,95.0,972.0.994.0,95 = 0,815

= = . + . + + .

Theo ta c:- P=6.5 (kw) cng sut trn thng trn;- t1=28 giy ;- t2=60 giy;- t = tck= t1 + t2 = 88 giy;- T1 = T ;- T2 =0,85T ;

- n=42 (v/ph) s vng quay trn trc thng trn;- L=6 (nm) thi gian phc v;- Quay mt chiu, lm vic 2 ca (1 ca lm vic 8 gi), ti va p nh.

Vy : = . + . = . +,

. = 0,9

Thay cc s liu tnh ton c vo (1) ta c:

= =, . .

,= 7,17 (KW)

Vy l ta cn chn ng c in c Pm Pct

Kim tra iu kin m my:


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= > = > 0

Kim tra iu kin qu ti:

= >0

= > 0

1.2 Chn ng c

Ta c: nlv = 42 v/pht: - S vng quay trn trc thng trn;

Chn: u = 5: - T s truyn ca b truyn ai thang;

uh = 10: - T s truyn hp gim tc bnh rng tr hai cp.

Vy: T s truyn ton b ca h thng dn ng l:

ut = u.uh = 5.10 = 50S vng quay s b ca ng c:

nsb = nlv.ut = 42.50 = 2100 (v/ph).

ng c phi c Pdm Pct; kt hp cc kt qu trn, tra (bng P1.2) ta tm c ng

c in K160S2 (ng c in khng ng b ba pha) cng sut ng c Pdc = 7,5

KW; s vng quay ca ng c: ndc = 2935 v/ph ( sch tnh ton thit k h dn ng

c kh tp 1; trang 234).

1.3 Cng sut ng c trn cc trc

Ta c: Plv = Pt = 6,5 (KW)

- Cng sut trn trc III (trc lm vic) l:

= =6,5

0,95.0,99= 6,911 ( )

- Cng sut trn trc II l :

= =

6,911

0,99.0,97 = 7,197 ( )

- Cng sut trn trc I (trc dn) l:

= =7,197

0,99.0,97= 7,495 ( )

- Vy kim nghim li cng sut trn trc ng c thc t l:

= =7,495

0,99.0,95= 7,969 ( )


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Cng sut ny ln hn cng sut nh mc ca ng c nn khng tha mn.

Vy ta phi chn loi ng c: DK.62-2 c cng sut P c = 10KW; s vng

quay: nc = 2930v/ph

1.4 Phn phi t s truyn

Vi ng c chn ta c: ndc = 2930 (v/ph); Pdc = 10 (KW)

Theo cng thc tnh t s truyn ta c:

= =2930

42= 69,76

ut = u.uh

Trong : ut T s truyn chungu T s truyn ca b truyn ai

uh - T s truyn ca hp gim tc

Chn trc u = 5 theo (bng 2.4 trang 21 sch tnh ton thit k h dn ng c kh),

=> = =,

= 14

Vi lc dn ng nh cho v da vo (bng 3.1 trang 43-sch tnh ton thitk h dn ng c kh), ta chn theo hp gim tc khai trin:

uch=2,92unh=4,79

Trong : uch- T s truyn ca b truyn bnh rng tr cp chmunh- T s truyn ca b truyn bnh rng tr cp nhanh.

1.5. Tc quay trn cc trc

- Tc quay trn trc I l:

= =

2930

5 = 586 ( / )


= =586

4,79= 122 ( / )


= =122

2,92= 42 ( / )

1.6. Xc nh mmen xon trn cc trc


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- Mmen xon trn trc ng c theo cng thc :

= 9,55.10 . = 9,55.10 .10

2930= 32594 ( )

- Mmen xon trn trc I l:

= 9,55.10 . = 9,55.10 .7,495

586= 122145 ( )

- Mmen xon trn trc II l:

= 9,55.10 . = 9,55.10 .7,197

122= 563372 ( )

- Mmen xon trn trc III l:

= 9,55.10 . = 9,55.10 .

6,911

42 = 1571430 ( )

Ta c bng thng s sau:

Bng 1.1:

Trc

Thng s

ng c I II III

Cng sut P (KW) 10 7,495 7,197 6,911T s truyn u 4 4,79 2,29Vn tc vng n (v/p) 2930 586 122 42M men T (Nm) 32594 122145 563372 1571430


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PHN II: TNH TON B TRUYN AI

2.1. Chn loi ai- Thit k b truyn ai cn phi xc nh c loi ai, kch thc ai v bnh ai,khong cch trc A, chiu di ai L v lc tc dng ln trc.

- Do cng sut thc t m b truyn ai nhn c ch l Pc v yu cu lm vicm nn ta hon ton c th chn ai thang, loi ai A.- T tnh ton trn ta c c: Pc = 10 (KW); nc= 2930 (vg/ph); u =5.- Ta nn chon loi ai lm bng vi cao su v cht liu vi cao su c th lm vicc trong iu kin mi trng m t ( vi cao su t chu nh hng ca nhit vm ), li c sc bn v tnh n hi cao. ai vi cao su thch hp cc truyn ngcvn tc cao, cng sut truyn ng nh.

2.2. Xc nh cc thng s hnh hc ch yu ca b truyn ai2.2.1. Xc nh ng knh bnh ai nh D1T cng thc kim nghim vn tc:

V = 60.1000 = (30 35) /

=> ( ). .

.= (196 228)

Theo (Bng 4.13 trang 59-sch tnh ton thit k h dn ng c kh) chnD1 = 160 mm

=> =. , .

.= 24,53 ( m/ s) < 25 ( / )

2.2.2. Xc nh cc thng s khc ca b truyn ai bng inventor:


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Sau khi khi ng Modul Design Acclerator chn Design V-Belts ComponentGenertor c:


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Chuyn sang tab Calculation tnh ton cc thng s ca b truyn ai. Chn Designnumber of belts tnh s ai. Nhp cc thng s P = 6,5 kw v n = 2930 v/ph cho ktqu tnh ton s ai l: z = 6

PHN III: THIT K B TRUYN BNH RNG

3.1. Tnh ton b truyn bnh rng tr rng thng3.1.1. Chn vt liu v cch nhit luyn

Do hp gim tc 2 cp chu ti trng trung bnh, nn chn vt liu lm bnhrng c rn b mt rng HB 350; ti trng va p nh, thay i, b truyn bnhrng quay 1 chiu, lm vic 2 ca, thi gian s dng l 6 nm. ng thi tng khnng chy mn ca rng chn rn bnh rng nh ln hn rn ca bnh rng lnkhong (10 15) HB. Chn:

Bnh rng nh: thp 50 ti ci thin. Tra (Bng 6.1 trang 92) ta c cc thng s cathp nh sau: Kch thc S khng ln hn100 mm

+ Gii hn bn: b= 850 MPa+ Gii hn chy: ch = 580MPa

+ rn HB = (241 285), chn HB = 250

Bnh rng ln thp 50 ti ci thin. Tra (Bng 6.1) ta c cc thng s thp nhsau:Kch thc S khng ln hn 100 mm

+ Gii hn bn: b = 750 MPa+ Gii hn chy: ch = 450 MPa

+ rn HB = (192 240), chn HB = 230(Vi c hai bnh rng ta chn phi c)T s truyn uh = 17,44: unh = 5,691 (cp nhanh)

Uch = 3,06 (cp chm)

Bng 3.1 thng s bn bnh rng

Thng s Bnh rng nh Bnh rng ln

Tn thp Thp 50 ti ci thin Thp 50 ti ci thin

Gii hn bn = 850 MPa = 750 MPa

Gii hn chy = 580 MPa = 450 MPa

rn HB1 = 250 HB2= 230

3.2. Truyn ng bnh rng tr3.3.1. i vi cp nhanh.

3.3.1.1. Cc thng s c bn ca b truyn c tnh bng inventor nh sau.

Sau khi khi ng Modul Design Acclerator chn Design and calculates spur gears, tac giao din lm vic nh sau:


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Trong phn Design Guide (hng dn thit k) chn Module v nhp t struyn trong mc Desired Gear Ratio (t s t ruyn) unh = 5,69, nhp gc nghing rng mc Helix Angle = 10o. Chuyn sang tab calculation chn Geometry Design (thitk hnh hc) v nhp cc thng s ca b truyn trong phn Loads: Power (cng sut)trn trc I: PI = 7,495 (KW); Speed (s vng quay) trn trc I: n I = 733 (vg/ph);Efficiency (hiu sut) b truyn bnh rng = 0,97. Chn vt liu thit k b truyntrong phn Material Values (vt liu), vi bnh rng nh Gear1 l EN C50 (ISO), vi

bnh rng ln Gear 2 la EN C50 (ISO); sau khi chn ta c cc thng s v ng suttip xc cho php bnh rng 1: H1lim = 1140 (Mpa), 2: H2lim = 1140 (Mpa);ng sut

un cho php ca bnh rng 1: F1lim= 390 (Mpa), 2: F1lim = 390 (Mpa); s gi lmvic: Lh = 6.300.16 = 28800 (hr).


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Chn Accuracy ( chnh xc) chn cp chnh xc v tiu chun thit k. y ta chn cp chnh xc l 8 v tiu chun thit k l ISO 1328:1997 (tiu chunISO s 1328 nm 1997)

Nhn OK


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Chn Factors (Cc thng s) nhp cc thng s khc cab truyn, ta chnKA= 1,25 ul (h s va p nh), cc h s khc mc nh theo tiu chun.

Nhn OK

Sau khi hon thin vic nhp cc thng s cn thit cho b truyn bn TabCalculation nhn chn Calculate. Sau chn Check Calculation v quay li tabDesign thc hin cc bc thit k b truyn. Trong mc Center Distance (khongcch trc) chn theo tiu chun, y chn 400 (mm); trong mc Number of Teethchn s rng z1=34; trong mc Facewidth (Chiu rng vnh rng) chn 89 (mm);trong mc Unit Correction (dich chnh rng) chn x1 = 0; trong mc Pressure Angle(gc p lc) chn theo tiu chun, y chn = 20o; cc thng s khc gi nguyntheo tiu chun. Nhp xong cc thng s chn Calculate (tnh ton) ta tnh c ccthng s sau:Module m = 3,5 (mm); Number of teeth (s rng): z2 = 193; Unit Correction (dich

chnh rng): x2= -0,934; Total Unit Correction (tng n v dch chnh):x =-0,934.


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Chn Preview xem li cc thng s tnh ton ca b truyn.


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Cui cng chn OK ta c b truyn bnh rng nghing cp nhanh. Kt qunh sau

Cc thng s tnh ton thit k b truyn bnh rng cp nhanh, bnh rng trrng thng.

Bng 3.2: Thng s b truyn bnh rng tr rng nghing

Common Parameters

Gear Ratio i 5.6765 ulDesired Gear Ratio iin 5.6900 ulModule m 3.500 mmHelix Angle 10.0000 degPressure Angle 20.0000 degCenter Distance aw 400.000 mmProduct Center Distance a 403.378 mmTotal Unit Correction x -0.9347 ulCircular Pitch p 10.996 mm

Base Circular Pitch ptb 10.473 mmOperating Pressure Angle w 18.6005 deg


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Tangential Pressure Angle t 20.2836 degTangential Operating Pressure Angle tw 18.9309 degBase Helix Angle b 9.3913 degTangential Module mt 3.554 mm

Tangential Circular Pitch pt 11.165 mmContact Ratio 3.2009 ulTransverse Contact Ratio 1.7953 ulOverlap Ratio 1.4055 ulLimit Deviation of Axis Parallelity fx 0.0330 mmLimit Deviation of Axis Parallelity fy 0.0160 mm

Gears

Gear 1 Gear 2Type of model Component Component

Number of Teeth z 34 ul 193 ulUnit Correction x 0.0000 ul -0.9347 ulPitch Diameter d 120.836 mm 685.921 mmOutside Diameter da 127.622 mm 686.164 mmRoot Diameter df 112.086 mm 670.628 mmBase Circle Diameter db 113.343 mm 643.386 mmWork Pitch Diameter dw 119.824 mm 680.176 mmFacewidth b 89.000 mm 89.000 mmFacewidth Ratio br 0.7365 ul 0.1298 ulAddendum a* 1.0000 ul 1.0000 ulClearance c* 0.2500 ul 0.2500 ulRoot Fillet r f* 0.3500 ul 0.3500 ulTooth Thickness s 5.498 mm 3.116 mmTangential Tooth Thickness st 5.583 mm 3.164 mmChordal Thickness tc 4.855 mm 2.752 mmChordal Addendum ac 2.510 mm -0.379 mmChordal Dimension W 48.237 mm 240.126 mmChordal Dimension Teeth zw 5.000 ul 23.000 ulDimension Over (Between) Wires M 129.124 mm 687.719 mm

Wire Diameter dM 6.000 mm 6.000 mmLimit Deviation of Helix Angle F 0.0330 mm 0.0390 mmLimit Circumferential Run-out Fr 0.0430 mm 0.0950 mmLimit Deviation of Axial Pitch f t 0.0170 mm 0.0230 mmLimit Deviation of Basic Pitch f pb 0.0160 mm 0.0220 mmVirtual Number of Teeth zv 35.469 ul 201.338 ulVirtual Pitch Diameter dn 124.141 mm 704.684 mmVirtual Outside Diameter dan 130.928 mm 704.927 mmVirtual Base Circle Diameter dbn 116.655 mm 662.186 mmUnit Correction without Tapering xz 0.0090 ul -4.8653 ul

Unit Correction without Undercut x -1.0548 ul -10.7563 ulUnit Correction Allowed Undercut xd -1.2248 ul -10.9263 ul


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n c s thit k my_____

Sv th c hi n: Nguy n n

Addendum TruncationUnit Outside Tooth ThicknTip Pressure Angle

Loads

Power P

Speed n Torque TEfficiency Radial Force Fr Tangential Force Ft Axial Force Fa

Normal Force Fn Circumferential Speed vResonance Speed nE1

Material

Ultimate Tensile StrengthYield StrengthModulus of ElasticityPoisson's RatioBending Fatigue LimitContact Fatigue Limit

Hardness in Tooth CoreHardness in Tooth SideBase Number of Load CyclBase Number of Load CyclW?hler Curve Exponent forW?hler Curve Exponent forType of Treatment

Strength Calculation

Factors of Additional Lo

Application Factor Dynamic Factor

__________________________________ H thng d

Thi

k 0.0305 ul 0.0305 ulss sa 0.7795 ul 0.8653 ul

a 27.1616 deg 20.0558 de

Gear 1 Gear 27.495 kW 7.270 kW

733.00 rpm 129.13 rpm97.643 N m 537.637 N m0.970 ul

558.978 N1629.769 N287.372 N

1746.118 N4.638 mps

5964.565 rpm

Gear 1EN C50

Su 640 MPaSy 390 MPaE 206000 MPa 2 0.300 ulFlim 390.0 MPaHlim 1140.0 MPa 1

JHV 210 ulVHV 600 ules in Bending NFlim 3000000 ul 3es in Contact NHlim 100000000 ul 10Bending qF 6.0 ulContact qH 10.0 ul

type 2 ul

d

KA 1.250 ulKHv 1.554 ul 1.554 ul

n ng thng trn

19

Gear 2EN C50640 MPa390 MPa6000 MPa0.300 ul90.0 MPa140.0 MPa

210 ul600 ul000000 ul0000000 ul

6.0 ul10.0 ul

2 ul


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Face Load Factor K H 2.765 ul 2.370 ulTransverse Load Factor K H 2.334 ul 2.334 ulOne-time Overloading Factor KAS 1.000 ul

Factors for Contact

Elasticity Factor ZE 189.812 ulZone Factor ZH 2.557 ulContact Ratio Factor Z 0.746 ulSingle Pair Tooth Contact Factor ZB 1.000 ul 1.000 ulLife Factor ZN 1.000 ul 1.000 ulLubricant Factor ZL 0.962 ulRoughness Factor ZR 1.000 ulSpeed Factor Zv 0.977 ulHelix Angle Factor Z 0.992 ul

Size Factor ZX 1.000 ul 1.000 ulWork Hardening Factor ZW 1.000 ul

Factors for BendingForm Factor YFa 2.422 ul 2.286 ulStress Correction Factor YSa 1.675 ul 1.688 ulTeeth with Grinding Notches Factor YSag 1.000 ul 1.000 ulHelix Angle Factor Y 0.917 ulContact Ratio Factor Y 0.657 ulAlternating Load Factor YA 1.000 ul 1.000 ul

Production Technology Factor YT 1.000 ul 1.000 ulLife Factor YN 1.000 ul 1.000 ulNotch Sensitivity Factor Y 1.138 ul 1.134 ulSize Factor YX 1.000 ul 1.000 ulTooth Root Surface Factor YR 1.000 ul

ResultsFactor of Safety from Pitting SH 1.993 ul 1.993 ulFactor of Safety from Tooth Breakage SF 3.235 ul 3.386 ulStatic Safety in Contact SHst 2.017 ul 2.017 ul

Static Safety in Bending SFst 7.104 ul 7.468 ulCheck Calculation Positive

3.3.2. i vi cp chm. ( Bnh rng thng)

3.3.2.1 Cc thng s c bn ca b truyn c tnh bng inventor nh sau:Khi ng Modul Design Acclerator chn Design and calculates spur gears

(thit k v tnh ton bnh rng)

Trong phn Design Guide (hng dn thit k) chn Module v nhp t s

truyn trong mc Desired Gear Ratio (t s truyn) unh = 5,31, nhp gc nghing rng

mc Helix Angle = 0o. Chuyn sang tab calculation chn Geometry Design (thitk hnh hc) v nhp cc thng s ca b truyn trong phn Loads: Power (cng sut)


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trn trc I: PII= 6,769 (KW); Speed (s vng quay) trn trc I: n II = 179 (vg/ph);Efficiency (hiu sut) b truyn bnh rng = 0,97. Chn vt liu thit k b truyn

trong phn Material Values (vt liu), vi bnh rng nh Gear1 l EN C45 (ISO), vi

bnh rng ln Gear 2 la EN C45 (ISO); sau khi chn ta c cc thng s v ng sut

tip xc cho php bnh rng 1: H1lim = 520 (Mpa), 2: H2lim = 430 (Mpa); ngsut un cho php ca bnh rng 1: F1lim = 410 (Mpa), 2: F1lim = 356 (Mpa); s

gi lm vic: Lh = 6. 300. 16 = 28800 (hr).

Chn Accuracy ( chnh xc) chn cp chnh xc v tiu chun thit k.

y ta chon cp chnh xc la 9 v tiu chun thit k l ISO 1328:1997 (tiu chunISO s 1328 nm 1997).

Chn Factors (Cc thng s) nhp cc thng s khc ca b truyn, ta chnKA= 1,25 ul (h s va p nh), cc h s khc mc nh theo tiu chun.

Sau khi hon thin vic nhp cc thng s cn thit cho b truyn bn Tab Calculationnhn chn Calculate. Sau chn Check Calculation v quay li tab Design thchin cc bc thit k b truyn. Trong mc Center Distance (khong cch trc) chntheo tiu chun, y chn 450 (mm); trong mc Number of Teeth chn s rngz1=20; trong mc Facewidth (Chiu rng vnh rng) chn 90 (mm); trong mc UnitCorrection (dich chnh rng) chn x1 = 0; trong mc Pressure Angle (gc p lc) chntheo tiu chun, y chn = 20o; cc thng s khc gi nguyn theo tiu chun.

Nhp xong cc thng s chn Calculate (tnh ton) ta tnh c cc thng s sau:Module m = 10 (mm); Number of teeth (s rng): z2 = 68; Unit Correction (dich chnhrng): x2= 1,0797; Total Unit Correction (tng n v dch chnh): x = 1,0797.

Cc thng s tnh ton thit k b truyn bnh rng cp nhanh, bnh rng trrng thng.

Bng 3.3 Thng s ca b truyn bnh rng tr rng thng


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PHN IV: TNH TON TRC

4.1 Chn vt liuChn vt liu ch to trc l thp 45 ti c b = 850 MPa.

ng sut xon cho php [] = (15 30) MPa

4.2 Xc nh s b ng knh trcTheo cng thc ng knh trc th k:

0,2[ ]

Vi k = 13

DO an (1phan Nhap)

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