Bai Giang Cnctm Thong So Hinh Hoc

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BI GING: THNG S HNH HCPHN CT DAO TIN KHI THIT K

Trnh by & thc hin:

BI NGC ANH

www. h cmute .e du.vn


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MC TIU DY HC

Sau bi hc ny ngi hc c khnng sau:

Kin thc: Trnh by c ccthng s hnh hc hp l ca daotin v Phn bit c cc gc dao tin. K nng: V c chnh xc ccthng s hnh hc ca dao tin. Thi : Rn luyn tnh cn thnv pht trin t duy k thut.

www. h cmute .e du.vn


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NI DUNG BI GING

I.Khi qut chung v thngs hnh hc ca dao tin.

II.Cc gc ca dao tin. III.Cu hi bi tp cng c


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I.Khi qut chung v thngs hnh hc ca dao tin

Qu trnh thit k, thng s hnh hc ca daoc xt trong hai tit din chnh N-N v tit

din ph N1-N1, v phoi thng c thot ratheo cc phng ca tit din , ko theocc hin tng vt l xy ra trong qu trnhct.

Trong tit din chnh ta c cc gc chnh, trongtit din ph ta c cc gc ph.


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Thng s hnh hc cadao mt ct N-N ti

im B bt k trn lict ( dao c li ct

ngang tm)


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Thng s hnh hc cadao mt ct N-N timi dao ( dao c li

ct ngang tm)


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II.Cc gc ca dao tin

1.Cc gc ly trn mtphng tit din chnh 2.Cc gc ly trn mtphng tit din ph 3.Cc gc ca li dao(Cc gc c xc nhtrn mt phng y) 4.Gc ly trn mt phngct ( Gc nng )


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1.Cc gc ly trn mtphng tit din chnh

a. Gc trc chnh

b. Gc sau chnh c. Gc sc chnh d. Gc ct chnh

e.Mi lin h giacc gc


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a.Gc trc chnh (gc thot phoi)

Gc trc chnh l gc gia mt trcv mt y o trong tit din chnh.


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a.Gc trc chnh (gc thot phoi)

Gc trc c tr s dngkhi mt trc thp hn mty, tr s m khi ngc li

v bng 0 khi mt trctrng mt y Gc c nh hng nqu trnh thot phoi khi ct Khi gc trc ln bindng phoi nh, vic thotphoi d dng, lc ct vcng tiu hao gim, nngsut tng.


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b. Gc sau chnh

Gc sau chnh lgc gia mt sauchnh v mt cto trong tit dinchnh.Gc lun lundng v c nhhng n vn ma st khi ct


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c. Gc sc chnh

Gc sc chnh lgc hp bi mttrc v mt sauchnh o trong titdin chnh.


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d.Gc ct chnh

Gc ct chnh lgc gia mt trcv mt ct o trongtit din chnh.


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e.Mi lin h gia cc gc

Gc v gc l hai gcc lp c chn trc tytheo yu cu gia cng (vt

liu, cht lng b mt giacng ), cn hai gc v l hai gc ph thuc vo gc

v .

Ta c + + = 900

= +

+ =90 0


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2.Cc gc ly trn mtphng tit din ph

a.Gc trc ph 1: l gcgia mt trc v mty o trong tit din ph.Gc 1 cng c th m,dng hoc bng khngtng t nh .


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2.Cc gc ly trn mtphng tit din ph

b. Gc sau ph 1: l gc gia mt sau ph v mtphng hp bi li ct ph v trc Z ti M1, o trong titdin ph. Gc 1 cng lun lun dng. c. Gc sc ph 1 : l gc gia mt trc v mt sau pho trong tit din ph. d. Gc ct ph 1 : l gc gia mt trc v mt phnghp bi li ct ph v trc Z ti M1, o trong tit dinph.

Ta c 1 + 1 + 1 = 90 0


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3.Cc gc ca li dao

a. Gc nghing chnh b. Gc nghing ph 1

c. Gc mi dao d. Quan h gia ccgc


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a. Gc nghing chnh

Gc nghing chnh: l gc gia hnh

chiu ca li ctchnh trn mt yv phng chydao.

Thc t dao tin c= 30 0 =>90 0


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b. Gc nghing ph 1

Gc nghing ph 1 l gc gia hnh

chiu ca li ctph trn mt y vphng chy dao. Thc t dao tin c

1 = 50 =>45 0


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c. Gc mi dao

Gc mi dao : lgc gia hnh

chiu ca li ctchnh v li ctph trn mt y.


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d. Quan h gia cc gc

Mi quan h hnhhc:

+ + 1 =1800

Trong v 1 lnhng thng s

c lp, cn lthng s phthuc.


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4.Gc nng cali ct chnh

Khi li ct chnhthng.Gc nng cali ct chnh

l gchp bi li ctchnh v hnh chiuca n trn mt

phng y o trnmt ct.


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Khi li ct chnhcong, l gc ogia tip tuyn timt im bt k trnli ct chnh vhnh chiu ca n

trn mt phng y


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Gc c th dng, m hay bng 0 v c nhhng n phng thot phoi.

Gc thng thng c gi tr t (-150

=>+150

)


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dng khimi dao l imthp nht cali ct


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m khi midao l im caonht ca lict


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Khi li ct songsong vi mty th = 0


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III.Cu hi bi tp cng c

Dng tit din chnh v mt phng y biu dincc gc ,,, ,,, 1

GII BT1

GII BT2

GIIBT3

BT2

BT1

BT3


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GII BT1

CC BC THC HIN


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CC BC THC HIN

HINH B2B1 B3 B4


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GII BT2


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GII BT3


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TI LIU THAM KHO

[1] NGUYN NGC O- H VIT BNH- PHAN MINH THANH,C s cng ngh ch to my, H.S phm k thut TPHCM. [2] PHM NH TN, Nguyn l ct v dng c ct gt, TrngTHCN H Ni, NXB H Ni. [3] NGUYN TH TRANH TRN QUC VIT, Gio trnh c sct gt kim loi, H.Bch Khoa H. Nng.


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THE END

h t d

BI NGC ANH Email: [email protected]

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Bai Giang Cnctm Thong So Hinh Hoc