Khảo sát thực nghiệm quá trình khoan ma sát trên máy phay

Ho Chi Minh T 6 M TAT Qud trinh khoan ma sdt chi tilt thdnh mdng chiu dnh hudng cia nhieu ihdng so, viec phin tich dexdc dinh dung cdc ylu to cdng nghi, trong do cd dp lUc dgc true dnh

NGHIEN cCru - TRAO eOi

MA SAT T R E N MAY PHAY

EXPERIMENTAL SURVEY FRICTION DRILLIMH PROCESS

O N MILLING MACHINE

Pham Quoc Hoing', Nguyen Tniemg An', Trin Cdng Hung", Nguyjn Hflu Quin'

'Hpc vien Ky thuit Quin s\(

'Tru6ng Dai hpc Cdng nghiep TP Ho Chi Minh

T 6 M TAT

Qud trinh khoan ma sdt chi tilt thdnh mdng chiu dnh hudng cia nhieu ihdng so, viec phin tich dexdc dinh dung cdc ylu to cdng nghi, trong do cd dp lUc dgc true dnh hudng den chdt lUdng vd ning sudt khi khoan Id dieu cdn thilt vd quan trgng Bdi bdo trinh bdy kSt qud cda khdo sdt thUc nghiim khi thay thllUdngtiln dao bangcdch duy tri vd cSdinh dp lUc doc true khi khoan ma sdt thip cacbon Kit qud nghiin cdu chi ra rdng cd the khoan ma sdt trln mdy truyln thdng thay thl mdy CNC, md vh ddm bdo chdt lUifng ndng sudt gia cdng

Tfl khoi: Khoan nhiit: Khodn ma sat: Khoan dinh hinh; Khoan chdy: Life ddy khi khoan

ABSTRACT

Friction dulling process for thin components is influenced by many parameters Ifs important

to define the main criteria ofthe cutting conditum and the axial pressure affecting the quality and

th h T l T"- '"f "^- ^"^'P^'P''^^*^ "-^ residts af experimental investigatigns, the benefits of affecting of the maintenance the constant thrust friction when drilling carbon steel

^^J^Comj^ra^veanaysismodelthroughtherelevantfactorssuchassp^

mdchmes but ensuring quality and machining productivity

Keyworfs: Frictwn drilling Thermal drill; Form drilU Flow drill: Flow punch

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TAP CHf CO KHi VI$T NAIM, Sd 7 nam 2016

NGHieN CLfU - TRAO DOI I.DATVANDE

hinh" (^^ m ' 1 ' T ^ ^ ^ " " * " * ' 8 ^ ' ' ' " ^ " ^ ' ^ « ' " ( * " ™ ^ -Ml), "khoan dtah

dung cu (mm khoan) va phdi lim cho trd liic bi& d ^ cua vat lieu giim, dudi tic dmig cua an toe

len mui khoan se tao thanh M tren tim kim loai, nhu l l hiln tren 1 ^ 1 ^ ^ '

<") (b) (c) (a; , ,

va tang trd Igi khi CO dng lot tren bl mat lam dUdc hinh ,hdnh

ca t h ^ i ^ n t t o d e ^ ^ o o ? ' T ' ' " ^ r r " " ' " ' ' * ° ' " ^ - ' " ' " 8 •'"* « " h khoan nhiet dd phdi cathetanglen dftl 600»Cva dvmg culende-n650-750»CAplVcdpctnictacdunglen dung cuvivat

rotiS:;:°"""^'*°-'^ ^*^"^«'™«»«^'> -«-wyr^::*u7:

Tren hinh 2, the hien ip lUc dpc

trijc tuong flng vdi cic giai do|n Ap lUc

Pz ting nhanh * giai d o ^ ban dau, khi

miii khoan xim nhap vio v^t lieu gia

cdng vi nhiet tao ra chua Idn (hinh 2

W (b), (c) Ap luc dpc trvic d?t dmh khi

miii khoan xim nhjp vao gan het chieu

day phdi (hinh 2.d) Sau do, do dien tich

tifp xiic tang Ien Iim tang nhanh nhiet

do vit U^u bi mem di, chiy len phia trin

dijng Of, ip luc giim xudng (hinh 2 (e),

({) Ap luc se tang tr* 1?! khi phan vat

liOu chay lOn phia tren dyng cii cd die

htoh thinh c d i o ong 16t, hojc bi cat ddt H ! „ I , , J „ , , J _

t,obem*tphangtrenph0i(hinh2(g, ' " " " ' ^ " ' ^ ^ ' ^ 1 ^ ^ * ^ ' " do(?n trong

ISSN 0866-7056

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NGHieNCCfU-TRAOOOl

i

is:|

Cdc nghien cCtu deu

chi ra rang, lUc cat tang cao

chu y^u do lildng chay dao

tang Day la dieu khdng

mong mudn khi gia cdng

cac chi tiet thanh mdng, bdi | m '•

nd cd the lam bien dang chi

t i ^ can gia cdng De giam

Iilc cat, can giam lilcfng chay

dao din den nang suat gia

cdng giam Gi3i phap dildc

diia ra la thay ddi Iildi^

chay dao theo tiing giai

HUnh 3 Chuang trinh CNC khoan ma sdt vdi cdc budc tiin dng vdi cdc giai

dogn chu yeu doan trong qua trinh khoan Dieu nay, chi thiic hi^n diidc tr^n may gia cdng s6 N h i sin xuat dung

cy khoan Flowdrill da di xuit giai phap niy the hi^n tren hinh 3

Tuy nhien, d^ thiJc hi?n di^u nay can phii dau til thi6t bi may gia cdng ky thuat s6, ngoai ra, cin lap trinh gia cdng d^ thay doi ItiOng chay dao theo tiing giai doan

Mye tieu cia nghien ciiu la thay vi gia cdng tren miy CNC, se gia cdng tr^n may truy&i thdng (khoan phay) Yi^c khdng ch^ li^c cat bang cich thay d6i lu^ng chay dao tr6n may CNC dd(?c

thay the bang cich duy tri mdt ap lilc dpc true cd dinh khi khoan Ap lUc nay dii nhd de khdng lam

hiin dang chi ti^t gia cdng Tuy theo trang thii nhiet dp ciia phdi vi ip l\ic dgc tr\ic, bildc ti^n se thay

ddi theo

2 V^T I i £ u VA THIET BI TH^C NGHI$M

Qui trinh khio sat thilc nghiem dildc tien hanh gia cdng tren phdi la thep (f>30xl ,3 mm, vSt

Ii?u Ii th^p cacbon thap CT38 cd cic thanh phan hda hpc dildc thi hien d bing 1 Vdi dung cu khoan

M8(hhih4.) ^ •

Bdng 1: Thdnh phdn hda hgc cua thip CT38

Mic th^p

CT38

P(max)

0.04

S(maK)

4H ^ ^

Hinh 4 Thdng so hinh hgc dung cu khoan ma sdt M8 (tpZS)

ISSN 0866-7056

TAP CHl CO KHf VI$T NAM Sd 7 nam 2016

t h u c nghiem dupc Hen hanh tren hai

giai doan:

Gifli dogn I: ThUc nghiem kiem chiing,

duae thuc hien tren may phay van ning Frejoth

FVHM-6.000S, vdi tdc dp true chinh li 2.200,

2.500, 2.800 v/ph, budc Hen ian lupt la 50, 75,

100 mm/ph, SiS d u i ^ cim bien lUc CBSB-3.000

N, bp do ludng khufch dai tin hieu KYOWA

WGA 200A, bo mach MEGA Ardumo 2.560

giao tiep thu thap dtt lieu tfl thiet bi do vl miy

tinh thdng qua phin mem IVlatlab/Simulink

Giai dogn 2: Thiic nghiem duy tri co dinh

ip lUc dpc true bang each sij( dung mOt trong hai phuong in: Dit tai kieu ddi trpng vi sfl dung he thong khi nen the hien tren hinh 5 Phuong i n dat tii don gian, p h i hop vdi dieu kien gia cdng thac te, my nhien, trong nghiOn cflu sfl dvng md hmh he thdng khi nen dS dieu khiSn hnh hoat, dong thdi diuin lpi trong ket ndi vdi thiet bi cam bien do lildng vi cam bien hanh trinh Md hmh thi i^hiem, diloc chi ra tren hinh 6 Tifti hanh thl nghiem vdi tdc dO true chinh n=2.S00v/phut, Pz=1150N

n

^ ^ ^ ^ ^ ^ ^ ^ ^ #

"''*'-OuytrldpIUcbandduPz:PhUgngdnlsddungdiilrgnsPhUdngdn2sddvngkhini„

I—^21

mnh 6 Mdhinh hi thdng t^u khiln duy tri dp iUc bing khi nen vdgiag lilp kit xudt da lilu ra mdv Hnh

•Mngquaphd„m(mUmigb/Simulinkvdigdlh6tn;chobomgchMEGAArduiT2560

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3 KET QUA VA T H A O LUAN

Ket qua thilc nghiem kiem chiing d giai do?n 1, dilc^c th^hi^n tren hinh 7 Ta thay, i p lilc ban dau tang dot ngdt sau dd giam, Iilc cat tang ldn khi Iilcfng chay dao tang, ddng thdi tdc dp tryc chinh

khdng ddng vai trd trong viic tang giim i p lilc dpc true Di^u nay phii h^p vdi cic kit qui nghifin

Cliu tnidc do

.^ _ , : _

—'" 7/1

1/

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ISSN 0866 7056

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NGHIEN CU'U - TRAO B 6 |

Ket qua thfle nghiem d giai doan 2,

dupc thl hien tren hinh g Thdng qua biiu do

ta nhan thiy, vdi gii tri i p Iflc cd dinh v i duy

tri, Iflc cit tang dan v i dn djnh (dfldng dd thi

nam ngang) trd ve 0 khi qua trinh khoan hoan

tat, dong thdi trong sudt qui trinh gia cong

budc tien dung cu thay ddi, thdi gian gia cdng

dflflc nit ngin lam cho nang suat gia c o i ^

tang Ddi vdi thep <|)30xl,3nim, Pz 1150 N, ta

CO van tdc tien cua dung cu bien diien tuong

flng tfl 30-145 mm/ph

Mo hinh thfle nghiem gia cdng vdi dung

cu khoan ma sat <)>7.3 (de tao 16 ren M8) trin thep cacJxin, gii tri i p luc dpc true Pz = 1.I50N, chieu diy phdi thep 1.3nim, thdi gian gia edng

la 8s Bfldc tien dyng cu thay doi do dfldc tfl 30-145 mm/ph So vdi viec khoan thdng thudng (khdng thay ddi budc tieii dvmg cu) cho nang soat cao hon va Iflc dpc true tdi da nhd hon

Trong nghien a l u ip Ifle dpc true duoc duy tri bang he thdng khi nen; tuy nhien, khi flng dung CO the sfl dyng doi trpng de phu hpp vdi dieu kien san x u i t •

Ngiy nhin bah 12/5/2016 Ngiy phan bien: 18/6/2016

Tii lieu tham khao:

Hinh S Biai dd dp lUC Pz hanh Irinh vd vdn loc tiln

cda dtmgcu, thdi gum gia cong hinh thdnh Sng lot

trong khoan ma sdt thep ^3axl.3mm

4 KET LUAN

Khoan ma sit chi tift tren thanh mdng,

cho phep lim ting chieu diy thinh, thuan loi

cho viec tao ren lam chac moi ghep

Khi khoan ma sit chi det thinh mong,

can giam gii tri luc dpc true d^ trinh bien dang

chi tiet gia cdng Deiamdieuniycangiam budc

aen, tfl dd giim nang suit gia cdng Giii phip

dflpc dfla ra li sfl dvmg may CNC va lap trinh dt

bfldc tien thay ddi theo tflng giai doan

Nghien cflu sfl dung miy gia cdng truyen

thdng, khdng sfl dung budc tien cd dinh m i diay

bing viec duy tri mpt ip lUc dpc true

[IJ Scott F Miller (2006), Eiperimental Analysis and Numerical Modeling ofthe Friction Drilling Process Transactions ASME, Manuf.Science 128:802.810 [2] Scott E Miller (2006) Friction Drilling of cast metals, totemational loumal of Machine Took and

Manufecture i6: 1526.1535

[3] Scott F Miller (2007), Thenno.Mechanical finite element modeling of the friction drilling process Journal of Manuiactuiing Science and EngineeriUE 129:531538

(41 RKiasauskas (2011), Experimental and statistical investigation of thermo-mechanical friction drilling process, ISSN 1392.1207

[51- Mehmet Tuncay Kaya, Alaattin Aktas, Bertan Beylergil, Hamza K Akyildiz (2014), An Fxperimenta! Study on friction drilling of ST12 steel, VoL38, No.3

[6] Nguyen Anh Tuin, Pham VSn Himg (2007); Ma

sat/loc, NXB Khoa hoc ™ I ^ thuit Hi NOi (7] wwwJlowdrilLcom

[8] www.centerdrilLcom

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