laUsMJiiaCONG NGHl^
f a ^ ^
tH" L.y
NGHIEN CUfU HON HOP BOI TR0N TRUC CHINH MAY CNC TREN c o s d MO PHONG SO
STUDYING MICRO LUBIRICATION FORCNC MACHINETOOLS SPINDLE BY COMPUTER SIMULATION
Ld Giang N a m , Phung Van T£ing, D a n g V u V i n h , Kieu X u a n V i i n , Nguyen Van Mui
T o m t i t
True chinh may cong cu CNC dirocthietke cho phep lam viec c( toe do cao. Boi tron eho cum true chinh dong vai tro quan trong den chat lifting lam viec va do tin cay eung nhU tuoi tho cija cum true chinh Do do boi tron gidi han dudi dang hon h(^ siJong mil da difOc nghien ciJu iing dung, B^i bao nay trinh bay m6t quy trinh nghien ciiti h5n hop boi tron cho true chinh may eong cu CNC tren ctJ sd mo ph6ng so bang phUOng ph^p phin t i l hflu han. Trong dd Ansys Fluent dUoc sii' dung de mo tS qu^ trinh hinh thanh hon hop boi trcm suong mil tif hai dau vao, mpt cho khi nen, mot eho dau. Nghiln cu'u da ehi ra mpt quy trinh thuc hien phan tich hon hcrp khidau cho boi trdn true chinh may dieu khien sd-Tirdo lam eO sci danh gia diat li/ong cOa t(mg loai dau boi tron, cung nhirlam Tien de cho viec nghien ciiu 6 ddva chat luong boi tron trong dieu kien boi tron gidi ban bang phuong phap sd.
Tir khtia: Boi tron khidau, True chinh may ffieu khien sd, Ansys Fluent, Mo phdng sd
Abstract
Machine tool spindle unit is designed to allow it work at high speed. Lubrication of spindle bearing plays an important role in working quality and reliability as well as the life of the equipment Therefore air/
oil lubrication has been studied and applied. This paper presented a process of a based on air/oil mixing lubrication for CNC madiine tool spindle using numerical simulation with the finite element method.
Where Ansys Fluent was used to simulate an air/oil mixing process to obtain a mist lubrication from two inlets, one lor air, one for oil. This research showed a process of analyzing air/oil lubrication for machine tool spindle unit. That simulation could be used to evaluate the quality of each type of lubricant, as well as study of bearing and lubricating quality in air/oil lubrication conditions by numerical method.
Keywords: Air/oil lubrication. Machine tools spindle units, Ansys Fluent, Computer simulation,
TS. Le Giang Nam, KS. Phting Van Tung, KS, flang Vii Vinli .Tryong Dai hoe Bacti Kiioa Ha Noi
KS. KieuXuanVieii,T1iS. NguyenVan Miii Ngay nhan bai: 28/02/2013 TrUcmgeaihocKinhte-KytliuitCongngtiiep Ngiythapnhandang: 05/04/2013 Email: legiangnam^maiLcom
1. Gidi THIEU
May CNC ngay nay difoc %\S dyng rong rai khong chi 6 cac nadc phat trien ma d ca cac nifcic dang phat trien, trong do co Viet Nam. IVlay CNC dung de che tao ra cac may moc, thiet bj va day chuyen san xuat phuc vu toan
bp cac nganh kinh te khac nhi/: cong nghiep nang (dong tau, khai thac mo, dien, dau khi, thiet bj van chuyen n h u o t o , tau ho^,..), cong nghiep nhe (det may, dong giay, thifc pham...), cong nghiep quoc phong (day chuyen san xuat vij khi, thuoc no...), cong nghe
thong tin (day chuyen s i n xuat vi macli dien ttf, lap rap may tfnh v l thiet bi vien thong...), cac thiet bi diing cho giao due va dao tao, cac thid't bi y hoc, Miy CNC cung co the dung d ^ tao ra cac sin pham thong dung va s i n ph^m cong nghe cao dUOc stf dung trong cuSc song va trong cong nghiep: khu6n mau dung de tao ra cac chi tiet bSng nhi/a dung trong cupc song hang r ^ cac chi tiet de cay va che tao cac ong nana, cac chi tiet bang vat lieu smhhgc de thay the xifpng trong y hpc, cScdo ga dung trong san x u l t chip dien tiJ,,.'"
May CNC cho phep gia cong vdi toe do cat cao de dap ilng diipc yeu cSuid nhCrng Ipi the cua viec gia c6ng cao toe True chinh cua may CNC thifdng lam viec vdi toe do rat cao (2000-30000 vgl ph)'^'.
Vdi che dp lam viec khic nghi&ti toe dp cao, che dp boi tron kh6ngthfft dung phaong phap nh6 gipt hay ngSh d i u , m d ma p h i i sif dung phuong phS[
boi trcjn dang phung sucjng (micro fog)"'. Nhieu qua trinh dUfle thUc hi&
thanh cong bang mo phdng, dac bie trong d d la viec sif dung cac c6ng o n h u Ansys, Ls-dyna[4]. Trong do Ansj Fluent eho phep nghien cufu tuongti cua da ITnh vUc: co khi, difin, thiiy khi.
Qua trinh nghien ciJu hon hpp sifcm dau cho boi tron cao toe da dupcthi hien b i n g m d phdng so vdi iJng dur Ansys Fluent.
lTapchiKHOAHOC&C0NGNGH|. S o 1 8 . 2 0 1 3
:n.iciNi,i: i c L n i N U L U t i i i
2. NGUVeN LV H I N H THANH HON OP SI/ONG D A U
Hinh 1. Bp Ipc-dieu ap-boi tron (FRL) Dau dupc hut tCr binh chu'a bang dp lenh ap do khi nen cd ap suit cao qua ic-io, khf nen ddng thdi xe tan dau d au ra tao thanh hon hop vi hat dang /ong dau. He thong khi nen bao gdm 6 Ipc - dieu ap •- cum tao hon hpp bdi On (hlnh 1). Bd FRL (Filter - Regulator Lubricator): FRL bao gdm Lpc - Dieu D - Cum tao hdn hop bdi tron cd cac hiem vu sau:
- Bd lpc cd nhiem vu tach nude, tap lat, bui la cac thanh phan cd the lam ing mai mdn cua cac bo phan chuyen Dng,
- Dieu I p de on dinh I p suit cho net bi sCf dung khi nen dat hieu q u i 10. Nd cdn cho phep dieu chinh mtfc 3 suat can thiet vdi pham vi dieu linh tir 1 - 6,3 bar, tuy nhien I p suat j | cao cd the gay rd ri khi nen tai cac )ng kin va moi noi.
- Cum tao hdn hpp bdi tron (hinh 2) r dung eho bdi tron bang dau dang rang mii [2]
id
Hinh 2. Cum tao hon hop boi tron dang suong mii (1: Dung dich boi tron, 2. Mum dieu ehinh lUu ng,3;6ngtrunggian,4:GEelfl)
f
Hinh 3. So do bo tn eac duifng ong ddng chay trong qua trinh bdi tron
3. MO PHdNG S6 QUA TRiNH HlNH THANH HON HOP BOI TRON
3.1. Ansys Fluent
Ansys Fluent la mdt md-dun ciia bd phan mem Ansys, eho phep md hlnh hda va tinh toan bai toan da linh vue[4].
Cic budc tien hanh vdi Ansys Fluent nhusau:
- Budc 1: Thiet lap md hinh 3D cho bai toan
- Budc 2: Chia ludi sCr dung Ansys Meshing
- Budc 3: Tao dU lieu ddng chay trong Ansys Fluent, bao gom: Dat thupc tinh vat lieu va dieu kien bi#n trong ong; D i t cic thdng sd dau vao cho dudng ong va b i t dau qua trinh tinh toan,
3.2. Mo hinh hoa va mo phong cum tao hon hop boi trOn
Hinh 5, Mo hlnh chia ludi thiet ke trong Ansys Workbench
Dau vao, dau ra va k^t cau cua gic- lo duoc md hinh hda nhu hinh 4. Qua trinh md hinh hda cd the thue hien trong md-dun Ansys Mechanical hoac Ansys Workbench. De thUc hien tinh t o i n bang phuong p h i p phan tCr hUu han, md hinh ludi dupe thuc hien nhu"
trong hinh 5. Cac thudc tinh cua d i u vao nhu hinh 6. Trong dd d i u vao khi
Hinh 4 Md hinh gie-lo cua cum tao hon hdji bdi trdn trong mdi tri/dng Ansys va Ansys Workbench
Hinh 6. Tao thuoc tinh va cac thdng sd dau vao
So 18.2013-TapdiiKHOAHOCaCONGNGHE 2 5
EIEjaSEHcoNGNGHt-
nen gom: van tde, v = 0,4 m/s; mat do ddng chly 5%; dudng kinh ddng chay 4 mm; nhiet dd 293,15 K. Cac thdng so dau vao cCia dUdng dau, theo dau Tonna 68 - d i y la dau dupc khuyen c l o cho bdi tron cum true chinh may CNC^', I p suat cua dudng vao dau bang ap suat cua binh chijra, p = 1 bar; dudng kinh ti^t dien ong hut d i u 2 mm.
3.3. Ket q u i tinh toan M d phdng so vdi Ansys Fluent cho biet trang t h l i hdn h p p bdi trOn t h d n g qua: ap suat p h i n bo (hinh 7.1); phan b o nhiet dp (hinh 7.2); trpng lupng rieng (7.3); phan bo v i n tdc (hinh 7.4);
dd rdi dau - khi trong dng (hinh 7.5).
Hinh7.1.Phan bo ap suit
Kmh 7.2. Phan bd nhiet
Hlnh 7.3.Trgng luong rieng
Hinh 7,4. Phan bo van toe
Hinh 7.5. Bd rdi dau - khitai dau ra TUdng tU nhU tren, khi thay d o i ap suat d a u vao k h i nen pmax = 6,3 bar t h u dupe cac ket q u i n h u h i n h 8.1 -^ 8.5.
Hinh 8,1. Phan bdap suat
piTg,;^ Bang viec khao sat tren mohinhsj d§ d a n g cho phep thay ddi ket cau ciji g-3 gic-lo de khao sat chat lupng dau u ,j cua hon h o p theo ket cau hinhhpcdaii
^ vao, cung n h u cho phep danh gia mk mh d p tieu hao dau tai dau vao. Vdi difdng - • •"'- kinh tiet dien d a u vao cua difdng dill Hinh 8.2. Phan bo nhiet do 1,5mm, ap suat dau vao khi 1 barva6,5 - . tx''ii'K\ bar CO ke't qua nhU trong bang 1,
' ^ ^ ^ ^ ^ ^ ^ — 4. KET LUAN
f
^ ^ ^ ^ ^ ^ ^ ^ l ^ ^ ^ ^ H Md phong so b i n g Ansys Fluentd V ^ ^ U H H ^ ^ ^ I H R P t h e khao sat dUOc qua trinh phoi hop^^m^m^^^mm ^^^^ j ^ ^ . ^ . ^ . ^ j ^ ^ . ^^^^ tao thanh hif m'B h o p VI hat va cac t h o n g so cua honhOf
" - ' • "-"' nay n h u ap suat, nhiet dd, do nhcft,il(
Hinh8.3.Trongluangrieng rdi, iuu luong d a u tieu hao. •;
DUa tren ket qua eua qua trinh if Bang 1, Van tdc, nhiet dp, ap suit, trong lUOng rieng cua hon hgp khi-dau theo cac tiet dien khac nm dauvaodau
\ . Thong so dau vao Thdngsodaura ^ - . , ^ Van toe (m/s) Nhiet dp (K) Ap suat (bar) Dp roi (mVs') Trpng lupng rieng (kg/m^)
Dudng kinh tiet dien dau vao dau Dj«to=2 mm
Ap suat dau vao khi
p„,MJliarj
35ZO00 _ ]
> TapdiiKHOAHOC&CONGNGH^ So 1 8 . 2 0 1 3
iUtlNl.tllCLni'JULUtjTI
jhdng sd cho phep thCr nghiem vdi :1c ket cau va cae thdng so dau v i o :ua khi, dau khic nhau nham nang cao :hat luong ciia hdn hop dau ra vdi d i l u lien dau vao hpp 1^.
Tr^n cd sd cua bai bao nay ed thi ien h l n h bai toan toi uu hda ket cau lau vao (dudng kinh dau vao khi, Jau) va ket cau dau ra de cd chat uong hon hpp khi-dau ed dp hat tot ihat tUdng urng vdi lUdng tieu hao
nhien lieu phij hpp.
Phan bien khoa hot: GS.TS Tran Van Pich
TAILI|UTHAMKHAO
[1].TaDuyLiem,Hethdng dieu khien so cho may cong cu, Nha xuat ban Khoa hoc va ky thuat. Ha Ndi 0999).
[2], BRIDGEPORT MACHINES, l „ Preliminary T0RQ-CUTTC1,TaTC3,TC41998
[3], PGS,TS. Nguyen Doan Y, Ma sat - mdn - boi tron, Nha xuat ban Xay dung. Ha Npi (2005).
[4]. Jinsuo Nie and Xing Wei, Nuclear Sdenee and Technology, Braokhaven National Laboratory, U,S Department of Energy [2011),
[5], GS.TS. Tran (ch Thjnh, TS. Ngo NhU Khoa, Phirong phap phan tiJl huti han, Nha xuat ban khoa hpcvakithuat,HaN6i(2007),
[6], S Dixit, U„ FINITE ELEMENT METHOD: AN INTfiODUaiON
I NGHIEM THU D h A l NCKH
^ - Sing 19/9/2013, H6i ddng khoa hpc da td chiic nghiem thu de tai "Xay difng .' he thdng bai tap toan cao cap theo hiTomy tang cifemg uing dung vao
c i c n g a n h k } t h u l t c6ng nghiep"
- Ngay 1/10/2013, Hdi ddng khoa hpc da to chdc nghiem thu de tai "Nghien ciiu ijhg dung diien lifocsieu n h i n thiJc trong viec phattrien von tiTvUng die sinh vien hoc chtTtfng trinh tieng Anh djnh huAig TOEIC ci3a khoa Ngoai ngu'va de tai " N g h i l n cdti tong hop dan xuat dia axit 5-iodosalicylic litig dung lam chat khang vi sinh vat" cilia khoa Cong ngh^ Hoa.
De tai do ThS. Le Anh Thang - Giang vien khoa Khoa hgc cOban chu nhiem. Sau thai gian nghien diu, nhom tac gii da xiy dung duoc cuon sich Bai tap t o i n cao cap 1 cd npi dung phii h ( ^ vdi yeu cau giing day cda nha trudng va nhu cau tUhpccCiasinhvi^n.
Nh6m tac gii da dUa ra ldi giii ehi ti^t eho nhu^g bai tap trong cuon sach 1]/
thuyet v l phan dang nhi^g bai tap die tnfng giiip sinh vien nhan dien cac bai tap, cd dinh hifdng d l glli cic bai tap vd cac vi du, b^i tap co hudng iing dung
^ t o i n hgc vao cac nganh ky thult nhu: ctf khi, nhiet hpc, dieu khien robot.
De tai CO tinh cap thiet va u^g dung thuc ti duoc Hdi dong khoa hoc nghiem thu de tai dat loai Kha.
- Ngiy 25/9/2013, H6i ddng khoa hpc da to' chdc nghiem thu de tai "Xay difng modul thtfc hanh ky t h u l t t r u y i n hinh s£r dung trong phong thi/c hanh".
6e t i i "Xiy difng modul thuc hanh ky thuat truydn hlnh silr dung trong phdng thuc hanh'do ThiVu Viet Hung - Giang vien khoa Oien tiJ thu nhiem ciing su Kham gia ciia ba giing vien v l mpt sinh vien dang theo hoc tai khoa. Vdi nhOng ket qua dat duoc, nhdm nghien cu\i da hoan thanh modul thUc hanh ky thuat ' truyen hinh, 6 bai hu'dng d i n thue hanh v l dupc dinh gia dat yeu clu dio tao, ' Tuy nhiln. Hoi d6ng khoa hoc cung gdp y ve hinh thdc oia cle sin pham nin yjang them tinh t h i m my. Danh gia chung v^ d l t l i , H6i ddng khoa hoe quyet
%inhde t i i dat loai Kha,
• f)e tai "Ngfiien cifu iing dung chien tisac sieu nhgn ttii^c trong vikpfidt trien von til vi/ng dio iinh viin hoc chi/ctng trinh tieng Anh M hU&ig TOEIC do ThS.
Nguyen Thu Huong - giing vien khoa Ngoai ngif chd nhi@m, Sau thdi gian nghien cihi, nhdm tac g i i da dUa ra dupc phUdng phap iing dung chien luoc sieu nhin thdc ddi vdi qui trinh phit triln tU vUng cho sinh vien hpc diUdng trinh djnh h u ^ g TOEIC nhim gop phan ning eao chit luong giing day mon tieng Anh tai tnfcmg Dai hpc Cong nghiep Ha Npi.
• tie tai "Nghien c(ft/ tong iiOp dSn xuat cua axitS-lodosalkyk Sag dung lam chat Ithdng vislnh raf'doTS. Nguyin Quang Ting -Tnrdng khoa Cdng nghe Hoa chu nhiem. Trang qui trinh nghidn cdu, nhom t i c gii da t6ng hop dirpcOS dan xuat cda axit 5-iodosalieyiic, Tir nhdng ket qui dat ddoc, nh6m nghiln cilu da hoan thanh cle ngi dung v l muc tieu nghien eUu de ra, gdp phin gidp cin bp, gilo vien nang cao nang lUc ehuyen mon trong cong t i c nghiln cdu khoa hoc v l dao tao.f)e tai''Nghien ciiu tdng hpp dan xuat cua axit S-iodosalicylic dng dung lam chat khing vi sinh v a f gdp phan vao viec xdly nudc, chdng 6 nhiem moi tnfcmg nen ed y nghia thue tien va cap thiet trong tinh hlnh hien nay, Hpi ddng khoa hpc da danh gia 02 de tai tren dat loai Khi.
So 1 8 . 2 0 1 3 - Tap dii KHOA HOC & CONG NGHE 2 7
