NGHIEN C O T U - T R A O D O I
NGHIEN Cl>U ANN HU'dNG COACHieN LU-gC CHAY DAO TQI CHAT LU'O'NG GIA CONG CAC DANG THANH M 6 N G
KHI PHAY CAO T O C HOP KIM NHOM AL6061
RESEARCH ON THE INFLUENCE OF MACHINING STRATEGIES ON PROCESSING QUALITY VARIOUS TYPES OF THIN-WALLED
ON HIGH SPEED MILLING FOR ALUMINUM ALLOY 6061
ThS. Dinmg Xuan Bign', ThS. Nguyen Van Cdng', KS. Dinh Dire M^nh', KS. Nguyen Vdn Due', Nguyen Trung KienS Doan V3n Dudng'
'Hgc vien Ky thuat Qudn sy
^Vien Cdng nghe, Tdng cue Cdng nghiep Qudc phdng
^Trudng Cao dang nghe Ddng Nai
TOM TAT
Bdi bdo trinh bdy ket qud nghien cuu dnh hudng cua cdc chien luac chgy dao khi phay cao toe cho cdc chi tiit hpp kim nhom dgng thdnh mong tai dp bong be mat, dp chinh xdc kich thudc vd thdi gian gia cong. Kit qud cua bdi bdo la ca sd cho viec xdc dinh chiin luac phay cao tdc hap ly cho cdc dgng thdnh mong khde nhau.
Tix khda: Chiin luac chgy dao, phay cao tdc, thdnh mdng.
ABSTRACT
This paper presents the result of research on thefluence of machining strategies on surface roughness, dimension accuracy and machining time on high speed milling for aluminum alloy thin-walled parts. Since then we brought out conclude reasonable milling strategy for various types of thin-walled.
Keywords: Machining strategy, high speed milling, thin-walled. ^
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l . D ^ T V A N D E
Gia cdng cao tdc la mot trong nhimg cdng nghe gia cdng cat got hien dai hien nay.
Loai hinh gia cong nay cho phep nang cao nang sudt, dp chinh xdc, chdt lugng be mat hon rdt nhilu so vdi gia cdng truyen thdng.
Hai linh vuc dugc ung dung cdng nghe gia cong cao tdc nhieu nhat la che tao khudn mau va gia cdng cac chi tiet dgng thanh mdng phuc vu cdng nghiep hang khdng va vu try. Van de gia cong cac chi tiet thanh mdng thuc sy la thd thach rat Idn ddi vdi cdc nha che tao trudc day.
De dam bao gia cdng dupc can giai quyet tdt cdc van de rung dgng, va dap, bien dang...Chi tiet CO dang thanh mdng la nhiJTig chi tiet cd ket cau thanh hay gan vdi ti le be day b so vdi chieu cao h nhu sau [ 1 5 ] : V ' > — (thanh sieu mdng),
/ « 100
( 1 < A / ^ _ L thanh mdng). Cd the chia lam cac 5 / ' ' 100
loai thanh mdng nhu: Dang canh, chii ' T " , dang chu "I" (ten gpi la do tac gia de xuat dya tren hinh dang cda chiing) (hinh I)
Hinh 1 Cdc dgng thdnh mong vd ket cdu thuc te Hau het cac chi tiet dgng thanh mdng dugc ling dyng trong linh vyc hang khdng va cdng nghe vu tru bdi uu diem ndi trgi cua chung la nhe va ket cau ben hon so vdi cac mdi lap ghep CO chuc nang tuong duang nhd tinh chat nguyen khdi cua chung. Thdi gian va chi phi cho cong viec quan ly, kiem ke chi tiet cung se giam di rdt nhieu so vdi cac he thdng lap ghep. LTnh vuc iing dung cua cac chi tiet thanh mong rdt dac dung va khd CO the thay thi vi tri cua nd. Chi tilt dang thanh mdng cung gap nhieu trong cong nghe chi
tao khudn, cdc dgng ddu cue cua cc!\^ nghe xunp vdi nhung khe khdng du nh6 de dung laser nhunj cung khdng du Idn d l gia cdng phay md phij diing den nhiing dien cue dgng thanh mdng.
Tuy cd nhilu uu dilm nhung vi?c gia cdng cac chi tilt dang thdnh mdng vdp phai mfl loat nhimg khd khan trong cdng nghe gia cfing nhu: He thdng cdng nghe, phuang phap gia con^
chi dp cdt,... cung nhung anh hudng den chit lugng chi tilt trong qud trinh gia cdng nhu ninj dgng, biln dang. Viec giai quyet dugc nhung van I d l nay ludn la thii thach khi gia cdng. I
Mdng gia cdng tdc do cao danh cho M vuc thanh mdng cdn nhieu mdi me d trong num.
Da cd mgt so nghien cuu dugc cdng bd nhu [1]
lien quan d i n dnh hudng cua che dp cat tdi d?
bdng b l mat cho hgp kim nhdm nhung mdi clu dung lai d dang phay mat don gidn vdi mdt chien lupc chay dao cu the. Tai lieu [2] danh gia anh hudng cua chi dp cdt tdi do chinh xae khi phay cao toe vat lieu ciing vdi chien lupc phay Pocket Tai heu [3] danh gia anh hudng ciia che do cat khi phay cao tdc hgp kim nhdm thanh mdng nhung Cling chi vdi mdt loai thanh mdng co bdn va mol chien luge chay dao. Ngodi ra cdn mdt sd bai viet lien quan den phay cao tdc gidi thieu tdng quan, chua di vao cu the.
Tren the gidi, gia cdng cao tdc thank mdng da dugc nghien ciiu va da cd nhieu conj trinh cdng bd ve gia cdng thanh mdng. Tai lieu [6]
ddnh gid anh hudng ciia cac thdng sd cat tdi bien dang ciia thanh mdng thdng qua luc cat. Tac gia F.J. Campa va cac ddng nghiep trong [7] danh gia dac tnmg ddng luc hpc khi gia cdng thdnh moog d dang day. [8] danh gid kha ddy dii tren nhi§u mat khi gia cdng thanh mdng nhu dac tnmg dpng lyc hpc, dao cu, lyc cat, bien dang va rung dpng.
Tac gia J.Bertil [8] ddnh gia dnh hudng ciia dao cu thdng qua dao ddng den chat lupng ciia chi tilt thanh mdng. Tuy nhien, vdn de v l chiln luge chgy dao dimg cho cu the loai hinh thanh mdng thi cdn it dugc nhac den.
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NGHIEN CUfU - TRAO e 6 l
2. NOI DUNG NGHIEN ClTU 2.1. Cdc chiln liro'c chay dao co* ban
Chien lupc chay dao thudng dupc nhdc den nhu Id phuang phdp cat khi iing dung cdc phan mem md phdng CAD/CAM trong gia cdng. Day cung la mgt trong nhieu yeu td cd dnh hudng true tiep den chdt lupng gia cdng chi tiet.
Kieu chay dao khde nhau, cdch vao vd ra dao, thir tu cdt khde nhau deu cd dnh hudng den luc cat, va dap, rung dpng vd bien dang cua thdnh mdng. Van de chien luge chay dao it dugc nhac den trong cdc cdng trinh dugc cdng bd trong vd ngodi nudc vi rat khd khan de dua ra md hinh toan hgc chinh xdc md td kieu chay dao trong cdc phan mem phdn tich, du dodn. Do vdy, con dudng thuc nghiem Id phu hpp va sdt vdi thuc te han cd de cd the ddnh gid dugc dnh hudng cua cdc chien luge chay dao tdi chat lugng gia cdng thdnh mdng.
Cd the ke d i n rat nhieu chien luge chay dao trong cdc phan mem CAD/CAM thdng dyng nhu: Chien luge Oneway, Zigzag, Zlevel, Spiral, Parallel,... Cdc chien luge chay dao phii hgp khi gia cdng chi tiet dgng thdnh mdng gdm: Oneway, Zigzag vd Zlevel.
OneWv Zigzag ComW P*rAISp«d i n - c - i j
Hinh 2. Cdc chien luge chgy dao thong dung Chiln luge Oneway tgo ra cdc dudng chgy dao theo 1 hudng cd dinh tren mOt be mgt cd dinh dua trSn vi$c xdc dinh dd la qud trinh phay thuan hay phay nghich. Dac diem cua chiln luge ndy Id lyc cdt khdng ddi chieu trong sudt qud trinh cdt.
Chien luge Zigzag tao ra cdc dudng chay
dao ddi chieu lien tyc theo chieu ddi tren timg be mat cd hudng xdc dinh. Chiln luge ndy cd luc cdt thay ddi.
Chiln luge Zlevel, day Id chiln luge chay dao cho cac b l mat ddc dung vdi chieu sdu cdt khdng ddi tir tren xudng. Chiln luge ndy cho dudng chay dao chgy timg ldp quanh ddo (thdnh ddc diing) theo chi§u Z tir tren xudng.
2.2. Mo ta bai todn vd phmmg phdp thuc nghidm Muc tieu thuc nghiem nhdm danh gid dnh hudng ciia cdc chien lupc chay dao tdi dp bdng b l mat, dp chinh xdc kich thudc va thdi gian gia cdng khi phay cao tdc cdc kieu thdnh mdng khde nhau vdi cimg mdt che do cat, kich thudc dp day, chieu cao vd chieu dai cd dinh.
Cac thi nghi6m dugc diyc hien tren mdy DMU60 monoblock Deckel Maho (tdc dp tryc chinh tdi da Id 12.000 vdng/phiit, cdng sudt ddng ca liyc chinh la 15kW, mdmen Idn nhdt 130 Nm, gia tdc Idn nhdt tren cdc true XA'/Z la 6/7/4 m/s^, tdc dp chay dao nhanh 30m/phut, tdc do chgy dao khi cdt t i i da la 30.000mm/phiit, he thdng thay dao tu ddng HSK -A63 kieu kep thuy luc, he dieu khien Heidenhain iTNC 530). Dung cy cdt Id dao phay hgp kim cimg chuyen gia cdng nhdm D16 mm, hai rang cat khi phay thd vd 6 rang cat khi phay tinh. Dd gd Id Etd chuyen dung ga kim loai mdu. Phdi cd kich thudc (ddi x rdng x cao): 60x16x100 mm, vat lieu la hgp kim A16061 (chua qua khii umg sudt du). Lupng du de lai khi gia cdng tinh (day x cao) la 2x50 mm.
Kich thudc thanh mdng thdnh phdm (ddy x cao) Id 1x50 mm.
Hmh 3 Phdi vd mdy gia cdng
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NGHIEN CUTU - TRAO D(!>l
Cac chiln luge dugc chon thyc nghi?m la Oneway, Zigzag va Zlevel tren phan mem Topsolid 2014. Tien hanh thyc nghiem theo 3 budc. Budc 1 thyc hien tren thanh rnong dang canh nhdm xdc dinh phuong phap de lai lugng du (diu hoac khdng deu de tranh viec can dao ti vao phan da gia cdng phia tren gay ra sai so).
Kit qua chpn phuong an de lai lupng du khdng deu (25mm chieu cao phia tren cd dp day 1,8mm va phdn cdn lai cd be day la 2mm). Budc 2 thuc hien gia cdng chi tiet dang canh vdi 3 chien luge khac nhau nham xdc dinh chien luge dimg cho gia cdng thd. Thyc nghiem nay dam bao chat lugng chi tilt khong bi anh hudng bdi qua trinh gia cdng thd. Ket qua cho thay, viec gia cdng til phoi day 16mm ve dp ddy 1,8mm va 2mm thi chien lupc chay dao khdng anh hudng den chat lugng chi tilt ban thanh pham. Do vay, tac gia chpn chiln tugc chay thd la Zlevel. Thyc nghiem thij ba nhdm chpn che dp cat hap ly cho pha^
thanh mdng nham dat chat lugng tot nhdt ve chat lugng be mat va dp chinh xdc (che dp cat nay se dugc giu nguyen cho tat ca cac chien lupc chay dao khi thuc nghiem cy the) (co sd chpn che dp cdt thyc nghiem la ket qua nghien ciiu trong tai lieu [I], [2], [5]). Ket qud la tac gia chpn che dp cdt cd djnh khi gia cdng tinh nhu sau: Chieu sdu cat t^0,5mm, be rpng cdt b=0,5mm, toe dp cdt Vc-300m/phut, tic do chay dao F=2000mm/
phut (Fz= 0,056mm/rang) (ung vdi dudng kinh dao D16mm va 6 rang cdt). Cudi cimg la cac thyc nghiem gia cdng tinh thdnh mdng vdi m6i dang thanh mdng se gia cdng tuang iing vdi 03 chien luge chgy dao. Viec Idy sd lieu dugc tien hanh Idn lugt nhu sau: Thdi gian gia cdng dui^c do theo thai gian thyc mdy §ia cdng tir khi bat ddu chiln lupc phay tinh den khi hodn thanh chuang trinh gia cdng. Dan vi do la phiit. Do do nham bl mat (vdi chi tilt dgng cdnh) do tren mOt khodng dp cao vdi 3 vi tri khac nhau (ehgn khu vyc cd do nhdm tdt nhdt dl do). Do d 3 khoang do cao: 0-5mm, 20-25mm va 40-50mm. Do dpc theo chilu cao cua thdnh mdng. Vdi chi tiet chfl
"T" va chu "1" thi do d 3 tdioang dp cao giing chi tilt dang canh, nhung moi khoang dp cao chi Idy 2 vi tri do phia trong gan gdn thi dau thiet bj do khdng dam bdo do dugc. Do dp sai lech kich thudc thi diing thudc cap hien thi sd (sai sd 0,01 mm) do d 2 dp cao 5mm vd 50mm. Mdi dp cao Idy 3 gia tri, tinh Idy trung binh.
Hinh 4. Dung cu do va cdc chi liet sau gia cong Sau khi tien hanh Idy so lieu, ta cd ket qua thuc nghiem theo bang 4.
Bang 4 Kit qud thuc nghiem
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NGHIEN CUfU-TRAO D O I
2.3. Ddnh gia kit qua thuc nghiem 1) Anh huang cua chien luac chgy dao tai thdi gian gia cong
I I
Hinh 5. Anh hudng cua chien lupc chgy dao tdi thdi gian gia cong
Quan sdt hinh 5 ta thdy, thdi gian gia cdng cho tiing loai hinh chi tiet chenh lech nhau khdng Idn giiia cac kieu chgy dao. Diem de nhdn ra la kilu gia cdng Zlevel cd thdi gian gia cdng ngdn nhat, kieu oneway mat nhiSu thdi gian nhat.
Dieu nay de hieu vi Oneway mat nhieu thdi gian chgy khdng cdt d6 v l diem cat ban ddu. Thdi gian gia cdng chi tilt dgng cdnh Id it nhdt. Vdy, xet ve chi tieu thdi gian, nen chpn kieu gia cdng Zlevel, phii hgp cho gia cdng thd va bdn tinh.
2) Anh hudng cua chiin lup'c chgy dao tai dp chinh xdc gia cong
h"\ii 1 1
Hmh 6. Anh hudng cua chien lu^c chgy dao ton dp chinh xdc gia cong Ddi vdi thanh mdng dang canh, d do cao 5-10 mm tinh tu tren dinh thdnh mdng xudng thi gid tri sai sd theo chien luge ZigZag Id cao nhdt, Zlevel la thdp nhdt. Kieu chgy dao ZigZag cd ket hpp cd phay thugn vd phay nghich theo thii tu
tOmg be mat, hudng ciia luc cat thay ddi lien tyc, ngoai y§u td dnh hudng cua su ti can dao cdn cd lien quan den dp ben thdnh mdng khi gia cdng thii ty timg b l mat. B I mat gia cdng sau se chiu sai sd nhilu nhdt do mat ben kia da gia cdng, dp Cling vimg cua chi tiet da gidm va rung ddng tang len. 6 do cao 45-50 mm (tuc Id chdn thdnh mdng), sai sd nhd ban rdt nhieu so vdi tren dinh thdnh mdng vd cdc chien luge gia cdng deu cho gid tri sai sd rat nhd, tuang duong nhau. Dieu ndy cd t h i gidi thich la do gan chdn thdnh mdng, do Cling vung cao ban do ket cau, it rung ddng ban vd khdng cd sy ti cua cdn dao. Cd the ndi, d chi tilt dang cdnh, lay chi tieu do chinh xdc thi nen ehgn chiln lupc Zlevel. Diem luu y la d dp cao 45-50 mm, Zlevel cho sai sd cao han hai chien luge cdn Igi. Tiic Id, khi dp ciing viing ddm bdo thi chiln luge Zlevel chua hdn la lua ehgn tdt nhdt.
Vdi thanh mdng dang chu" " T " ta cd t h i thdy, chiln lupc Zlevel cho gid tri sai lech kich thudc Id nhd nhat tren todn bd chieu cao chi t i l t mdng. Ciing phai nhan thdy rang, ve tdng quan, gia tri sai sd cho cdc chien luge chgy dao d dgng thdnh mdng ndy Id rdt nhd.
Ldn nhdt Id 0,227 mm. Dieu nay cho thdy, khi thilt k l , cdu true thdnh du rat mdng nhung ddm bdo cd lien ket ben viing (ddng nhat vat lieu, khdng gay tap trung iing sudt, ket cdu khdng thay ddi dot ngdt,....) thi vdn cd the gia cdng dat yeu cdu kT thugt.
Cudi cimg, chi tiet dgng chii " I " cho thdy kit cdu ciia thanh mdng dugc lien ket chat che vdi hai thdnh ben nen rdt ciing viing, cdc chien luge chay dao deu cho sai sd gia cdng rat nhd (chua den 0,06 mm) tren todn bd chieu cao ciia thdnh mdng. Liic nay du chgy vdi chien luge gia cdng ndo thi cung cd the dam bdo dugc yeu cau kl thudt. Vdi kit qud thuc nghiem tren hinh 6 thi chiln luge ZigZag Igi cho gid tri sai sd gia cdng
la nhd nhdt. ^
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NGHIEN CUfU-TRAOD6I
3) Anh hudng cua chien lup'c chgy dao tdi dp nhdm bi mdt
11.
Hinh 7. Anh hudng cua chien luac chgy dao tdi dp nhdm be mat
Dua tren hinh 7, vdi chi tilt dgng canh, ^ d tri do nhdm ldn nhdt la 1,863 pm (giiia cdp 6 va cdp 7), nhd nhdt Id 0,206 pm (giiia c ^ 9 vd cap 10).
Phdn tren dau thdnh mdng chiu dao dgng va va dap nhieu nhdt nen be mat bi "gan" (thd), cdc chien luge chay dao deu cho ket qud tuong duong nhau, liic nay chien luge Oneway cho ket qud khd quan nhdt, dieu ndy phu hgp vdi thyc t l gia cdng, viec phay diudn cho b l mat cd dg bdng tet nhdt Vdi chi tiet dang chii ' T ' , chien luge Oneway cho chdt lugng be mat tdt nhdt, khi dp cimg vihig cua chi tiet tang len (phia gdn day thanh mdng), cac chien luge cdn Igi mdi cd dupe chat lupng be mat tdt CJ phia tren cung ciia flidnh mdng, chien lupc Zlevel tao ra dudng chay dao cd lyc cat ddi chieu lien tuc, rung ddng cd hai phia va lien tiep nhau nen cho chdt lugng be mat thdp, khdng dn dinh. Hai chien luge cdn lai thi rung ddng mdt phia nen chdt lugng be mat tdt hon. Cudi ciing, vdi dgng thdnh mdng chO: "1", can cii vao ket qua ttiuc nghiem tren hinh 7, ta thdy rang, chdt lugng b l mat tang len rdt nhieu khi do ciing vimg ciia thanh mdng cao len. Gia tri do nhdm Idn nhdt Id 0.886 pm (giua cap 7 va cdp 8) vd nhd nhdt Id 0,143 pm (giiia cdp 10 vdcE^ 11). O miic dp Cling vung cao, chien luge Zlevel cho chdt lugng b l mat tot nhdt, chiln luge ZigZag cho chdt lugng be mat t h ^ nhdt. Cd dugc ket qua nay la do su thay ddi miic dp cimg viing ciia thdnh mdng, hgn che dupc dnh hudng do rung ddng.
2.4. Danh gid chung ve anh hudng cua chiln lucre chay dao tdi chSt luong gia cdng
Nhu da ndi d phdn tren, uu dilm ndi trdi ciia viec gia cdng phay thdnh mdng Id dg bin cua thdnh mong cao ban nhieu so vdi viec lap ghep do li6n kit kim logi ndi tai cua ban than chi tiet, gidm sai sd do gia cdng, 1 ^ ghep va chi phi quan ly,...
Viec nghien ciiu cdng nghe gia cdng thanh mdng Id
cdn thilt Ciing da cd nhilu nghien ciiu ve vi?c gia cdng thdnh mdng (rung ddng, bien dgng, quy trinh gia cdng, kieu logi thanh mdng,...) cd ling dyng cap phdn mem CAD/CAM nhim du doan, danh gia kit qud ciia qud trinh gja cdng nhung viec md phdng, dtf dodn kit qud gia cdng ddi vdi cdc chien luge chgy dao Id khd khin va can nhiSu gia thilt han. Do vgy, trong nghien ciiu nay, tdc gia tilp can theo hudng thuc nghiem vdi cac chiln lupc tren cdc dang thanh mdng ca ban Id dang cdnh, dang c h i i ' T ' vd dang chft 'T'. Bai todn dat gia thilt la vdi ciing mdt dp day vd chilu cao cho thdnh mdng, cung mpt che dp cat, ciing mdt logi dung cu gja cdng. Mgt sd ddnh gia, nhdn xet cd the dua ra nhu sau
Khi gia cdng cdc chi tilt thanh mdng dgng cdnh, neu Idy chi tieu Id thdi gian gia cdng vd do chinh xdc gja cdng thi ehgn chien lupc Zlevel, neu Idy cM tieu dp nham b l mat thi chpn chien luge Oneway.
Vdi md hinh thi nghiem va hinh dang hmh hgc trong d l tai, ta cd thi dat do nham trung bmh 0,943pm ( c ^ 7 va cap 8), do chmh xae trung binh 0.07mm vd thdi gian gia cdng dudi 10 phut (vdi kich thudc theo mo hinh thyc nghiem).
Khi gia cdng cdc chi tilt dgng chii'T", chien luge chgy dao tot nhdt la Zlevel. Day la chien lupc cho cac chi tieu tdt nhat ve do nham be mgt, do chinh xdc vd thdi gian gia cdng. Dp nham dgt 0,747 pm, dO chinh xdc dat 0.05mm vd thdi gjan gia cdng khodng 11 phiit
Tuang tu vdi cdc chi tilt dang chft "I", chien luge chay dao tdt nhdt la Zlevel. Vdi chi do cdt thuc nghiem, dg nhdm dgt 0,393 pm, do chinh xdc dat 0.03mm va thdi gjan gia cdng khodng 12 phiit
Ap dung cac kit qua dat dupc, tdc gia dd thyc hien gia cdng mdt sd mau cd md hinh nhu Wnh 8 vdi cac thdng sd nhu sau: Vat Ueu chi tidt Id hgp kim A16061 chua qua khu img sudt du; dp ddy x chilu ddi thanh mdng: 0,8 x 100 mm; Chilu cao thanh mdng: 30 mm; Chien luoc gia cdng: Zlevel; Mdy gia cdng, dd gd, dyng cu cat va chi dp cdt: Gidng gia cdng thuc nghiem; Ta cd ket qud do dupc: Gid trj dp nhdm trung binh: 0,35 pm (gjiia cdp 8 vd cdp 9); Gid tri sai lech kich thudc (dp chinh xdc kich thudc) trung binh: 0,02 mm.
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NGHIEN CUfU-TRAODOI
Hinh 8. Cdc chi tiet gia cdng mdu
3. KET LUAN
Nhu vdy, dua tren phuang phdp gia cdng thuc nghiem, thdng ke vd xii ly sd lieu, bdi bdo da danh gia dugc dnh hudng ciia cdc chien luge chay dao tdi chdt lugng gia cdng cdc dgng thanh mdng khde nhau khi phay cao tdc cho hgp kim nhdm 6061. Tren c a sd giu nguyen che do cdt, ta thdy rdng chien luge chgy dao Zlevel dp dung cho viec gia cdng cac chi tilt dang thdnh mdng la hgp ly nhdt. Dieu ndy se gdp phdn khdng nhd cho cdc nhd gia cdng khi nghien cuu ve gia cdng phay cao tdc cdc chi tiet dgng nay. Trong qud trinh nghien ciiu, tac gid ciing nhdn thdy mdt sd yeu td cd tdc ddng quyet dinh den cdc chi tieu chdt lupng thdnh mdng md chua de cap den d ddy nhu: Mdi quan he giiia do ddy thdnh mdng vdi chidu cao va chieu ddi thanh mdng. Cd the dua ra nhdn dinh rang, chieu cao thdnh mdng cdng gidm, dg day cdng tang vd chieu ddi cdng nhd thi chat lugng cang cao. •
Ngdy nhdn bdi: 06/3/2015 Ngdy phdn bien: 17/4/2015 Tdi li^u tham khao:
[ 1 ]. Duong Xuan Bien, Do Ti6n Lap (2012); "Nghien ciru dnh hudng ciia cdc thdng so cong nghe den dp nhdm be mdt khi gia cong phay cao toe hpp kim nhom A16061", Tap chi Co khi Vi?t Nam, s l 11/2012.
[2], Nguyen HQu Thiiy (2013); "Nghien ciru dnh huang cita cdc thdng so cdng nghe den do chinh xdc gia cong khi phay cao tdc ", LVTN cao hpc Hpc vien Ky thudt Quan sy.
[3]. Le Thanh Quan (2014); "Nghien cuu dnh hudng cua cdc thdng sd cdng nghe den chdt lu^mg be mat
gia cong khi phay cao tdc thdnh mong", LVTN cao hpc Hpc vien Ky thuat Quan sy.
[4]. Luu Van Anh (2013); "Nghien cuu dnh hirdng cua mpt sd yeu td cdng nghe den dp nhdm be mat khi tien cao tdc tren mdy CNC", LVTT4 cao hpc Hpc vien Ky thudt Quan su.
[5]. Duong Xuan Bien (2013); "Nghien cdu dnh hudng cua chieu sdu cdt vd be rpng cdt tdi dp nhdm be mat khi phay thudng vd cao tdc ", Tap chi Khoa bpc & Ky thuat Hpc vien Ky thuat Quan su, sd 58, 12/2013.
[5]. TangAijun, LiuZhanqiang (2008); "Deformations of thin-walled plate due to static end milling force ", School of Mechanical Engineering, Shandong University, 73 Jingshi Road, Jinan 250061, China.
[6]. F.J.Campa, S.Seguy (2007); "Stable Milling of Thin-Walled Parts with Variable Dynamics", Sixth Intemational Conference on HIGH SPEED MACHINING.
[7]. Erhan Budak (1994); "Mechanics and dynamics of milling thin walled structures", Department of mechanical Engineering the University of Bristish Colombia Vancouver Canada.
[8]. J.Bertil Wanner (2012); " Strategies for reduc- ing vibrations of thin —walled compornents, Licenti- ate thesis, Stockholm, Sweden.
[9]. O. B. Adetoro, P. H. Wen , W M. Sim, R. Vepa (2009); "Stability lobes Prediction in Thin Wall Machining", Proceeding of the world congress engineering 2009 Vol I WCE, UK, London.
[10]. M.Adithan (2007); "Process planning and cost estimation ", New age intemation limited Publishers, New Delhi.
[11]. Zaghbani I. and Songmene V, 2009a, "A force- temperature model including a constitutive law for Dry High Speed Milling of aluminium alloys, Materials Processing Technology"
[12]. Jozef Peteika and Ivan Buransky (2010); "Using ARAMS for mesurement of deformation of thin-walled parts during milling ", Slovak university of technology
in Bratislava.
[13].Ra)al23mshah(2011); "Hybrid deflection prediction for machining thin-walled titanium alloy aerospace
compoment", thesis of Doctor of Philosophy, RMIT University.
[14]. Boeing Technology Phantom Works, 2008, High Performance Ti Machining, Advanced Manufacturing Reseached and Development.
[15]. G. Yang, 1980, Elastic and plastic mechanics.
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