LTNG DUNG PHAN MEM ETA/DYNAFORM TRONG MO PHONG QUA TRINH DAP THUY TENH
SAN PHAM ONG KIM LOAI
Binh Vdn Hien Khoa Dien - Ca Email: [email protected] vn
Vuang Gia Hai Khoa EHen - Ca Email: [email protected] Ngdy nhgn bdi: 09/2/2018
Ngdy PB ddnh gid: 05/3/2018 Ngdy duyet ddng: 10/3/2018
T O M T A T
Gia cdng kim loai bang dp luc la m6t ngdnh co bdn trong sdn xudt co khi. C6ng nghe nay cho phep tao ra eac sdn pham cd hinh dang vd kich thudc phiic tap. Trong do, dap thuy ttnh la phuong phdp d ^ dac biet. Phucmg phap nay dupe img dung rpng rdi trong viee tao hinh eac chi tiet vo mong co hinh dang phiic tap trong cac nganh c6ng nghiep hang khdng vd 6 td bdi nd cd nhieu uu diem so vdi cae phuong phap dap vu6t thdng thudng. Bai bao nay, tac gia iing dung phdn mem Eta/Dynaform vao viec m6 ph6ng qua trinh dap thiiy tinh chi tiet dang dng vdi mue dieh tdi uu boa qua trinh dap thiiy tinh [4].
Tie khda: Cong nghe dap thiiy tinh, 6ng kim loai, phan mem Eta/Dynaform, md phdng so.
A P P L I C A T I O N O F E T A / D Y N A F O R M S O F T W A R E F O R T H E H Y D R O S T A T I C P R O C E S S SIMULATION O F M E T A L TUBE P R O D U C T S ABSTRACT
As a basic mechanical industry metal forming allows the creation of products with conplex shapes and sizes. Among applications of this technology hydrostatic process is a special drawing method, which is widely used in the shaping of thin products with complex geometry in the airplane and automotive industries due to its plentiful advantages compared with other conventional deep drawing methods. In this paper, the author uses the Eta/Dynaform software in simulating hydrostatic process of tubular metal products in order to optimize this process.
Keywords: Hydrostatic technology, metal tiibe, Eta/Dynaform software, the numerical simulation.
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I. DAT VAN DE
Theo [5], phuang phap dap thuy tinh la qua trinh dap bang chay chat long cdi ciing.
Phuong phap ndy sii dung ehdt 16ng cd ap sudt cao de bien dang tdm, do d6 khdng cdn gia cong chay va giam dupe s6 nguyen edng.
Phoi ddp Clidy ep dpc tnic
I
Oiia trhili hoan thanfi
Hinh 1. Sa do dap thuy tinh chi tiet dgng dng
Phuong phdp ddp thiiy tinh da vd dang dupe iing dung rdt rpng rai trong viec ehe tao cac chi tiet vo mdng co hinh ddng phiie tap nhu ong xd, vd dan phao,...
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Hinh 2. Cdc sdn phdm dap thuy tinh tie phdi dng
Tuy nhien phuang phdp nay vdn edn mpt so nhupc diem. Dd la su chay khdng dn dinh cua vimg mat bich phoi d cac phan khac nhau tren vdnh mep cua ehi tilt (khi dap cd dich chuyen mat bich phdi). Dieu nay the hien d dang nhan mot phia ciia mat bich phdi do nguyen nhdn la su khdng d i n g deu cua trd lire bien dang d mat bieb, vd cdn do su khdng ddng deu cua luc ma sat xudt hien giua mat bich phdi vd dung cu. Them nua, lupng bien mdng va dp khdng ddng deu theo chieu dai cua thdnh ebi tiet la ddng ke, do dd lam giam chdt lupng ciia chi tiet dap.
2. CAC BU'OC M O PHONG SO BOfI PHAN M E M ETA/DYNAFORM
2.1. Gidi thieu phan m i m ETA/DYNAFORM
Theo [3], Phdn mim ETA/DYNAFORM la mpt goi phan mim phdn tich mo phong tao hinh kim loai tdm ti-en co sd LS-DYNA dupe phdt triin bdi Engineering Technology Associates, Inc. Cdng cu phdn tich ciia eta/DYNAFORM la LS-DYNA, hien nay nd dupe phat trien vd b6 trp bdi Livermore Software Tenology Corporatian. Phan mem ed ehiic nang phdn tich tuang tac va quy luat sap xep dupe hpp nhdt lam mpt de phuc vu cho nen cdng nghiep tao Hnh kim loai tdm trong thiet ke vd phdt trien thiit bi.
ETA/DYNAFORM la mdt gdi phdn mem phan tich phdn tir hiiu ban hoan chinh dimg de m6 phdng, tinh todn vd thiet ke edng nghiep, da va dang dupe irng dung tren todn the gidi trong nhieu linh vue c6ng nghiep nhu hang kh6ng, 6 td, ca khi, dung cu the thao va do gia dung...
Sau khi khdi ddng phdn mem ta se vdo eiia sd chinh nhu hinh 4, ddy ciing la mdi trudng thiet ke mo binh va cai ddt bdi toan m6 phong (Pre-Processor).
Hinh 3. Quy trinh cdng nghi sdn xudt thue ti CO su dung mo phong so Mpt trong nhiing phuong phap nham tdi uu hda qua trinh tao hinh la md phdng s6. Phuong phdp nay dupe iing dung rpng rai nhd nhirng uu diem ndi bat nhu giam ehi phi thir nghiem, ndng cao chdt lupng san phdm,...
Hinh 4. Giao diin Pre- processor cua Dynaform
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ETA/DYNAFORM la mpt phan mem dupe img dyng rpng rdi cho nhieu bai toan co hpc vd dae biet ed hieu qud ddi vdi bdi todn bien dang phdi tam, phdi dang dng. Md phong s6 vdi phdn mem dd cho phep tinh toan hoan thien mpt qua trinh dap thuy ffnh, bao gdm xdy dung md hinh binh hpc (Niit lenh Preproeess), chia ludi phdn tir, lua chpn ede cap tiep xiic giiia phdi va dung cu gia cdng, dieu kien bien ciing nhu gidi bdi toan de tim trudng phdn bd irng suat, bien dang trong vdt lieu va trong dung eu bien dang.
2.2. Cac budc tien hanh md phdng so qua trinh dap thiiy tinh
M6 phdng s6 la phuong phap biln thi qua trinh biln dang len tren man hinh vi tinh, eho phep ta biet dupe cac khuyet tdt xudt
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xay tRffig m& hlrti v^t it^u /no hinh Ii4p M:K: VA c£ic didu ki^n
hien ti-en san phdm, tii dd dua ra cac thdng s6 cdng nghe: luc ehan, kich thudc chay edi... hpp ly nhdt [2],
Trong thuc t l san xudt, mot khd khan tdn tai tir trudc tdi nay la nguyen edng ldp rap khu6n rdt khd, phai dap thir nhiiu ldn thi mdi ra dupe sdn phdm dat yeu cdu, Phuang phap md phdng sd da khdc phuc dupe khd khan tren, cdc thdng si cong nghe riit ra dupe cd dp chinh xae rdt cao lam don gian boa viee ldp rap khudn, giam sd ldn dap thu, thudng thi ehi edn mpt Idn dap thu Id ra dupe san phdm cd chat lupng tdt [1].
Trinh tu ede budc tien hdnh md phong sd dupe thuc hien nhu hinh 5:
( C*p nlt»t m6 Mnii hinh hpc ^
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Hinh 5. Trinh tuedc bu&c tiin hdnh md phdng sd
Cd the xdy dung md hinh Wnh hpc eua phdi tren phdn mim nay thong qua md dun Preproeess. Vdi cdc bai todn phiic tap tH it dung md dun nay ma chi nhap mo hinh thiit ke tren phdn mem khae (nhu Catia, NX, Pro Engineer...) Viec chia ludi phdn tii eho cac md binh da xdy dung va thiet ke md hinh FE, them cae ddi tupng khac nhu gdn vudt, dan hudng, dinh nglua phdi va vi tri... thdng qua niit lenh Tools ciia phdn mem
Niit lenh Setup trong phdn mem: Id cae md dun cai san (wizard) cho cac dang bdi toan trong Dynaform va trong do ta thudng diing md dun AutoSetup de edi dat cac bai toan tdm thdng thudng, dac biet la bai toan dap vudt, dap thiiy co, dap thiiy tinh Cai dat dp suat: P = 700 atm; Cai dat thdi
dang dng (tube forming) vd thuc hien qud trinh md phdng.
3. MO PHONG SO QUA TRINH DAP THUY TtVH PHOI ONG
3.1. Mo phong qua ttinh dap chi tiet dang ong
a) Dir lieu mo phong qua trinh dap thuy tinh phoi ong:
Chieu ddy phdi S = 0.5 mm; Dudng kinh phdi: 30mm; Chieu dai phdi: 300mm
He thdng bao gdm: hai chdy ep dpc true, cdi va phdi nhu hinh 6.
Vat lieu : thep can ndng DQSK36;
Gidi ban chay db (VMpa) : 270 ; Dp gian dai d5 (%)': 27;
gian: t = 0.01s;Sd Step = 1 7
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Hinh 6. Mo hinh hda hi thdng dap thuy tinh chi tiit dang ong b. Trinh tu tiin hdnh vd kit qud md phong
+ Chia ludi cac phdn tir nhu binh 7 vd hinh 8
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Hinh 7. Chia lu&i phdi vd hai ehdy dgc true
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Hinh 8. Chia luai cdi
+ Ket qua sau khi chia luoi toirn bo cac phin tit cua he th6ng nhu hinh 9
Hinh 9. Mo hinh lu&i todn bd cdc phdn lu eua hi thong
+ Thiet lap cac thdng sd ddu vao eua qua trinh dap thuy fi^nh nhu khai bao vdt heu phdi (hinh 10), tdc dp ciia chdy dpc true, thdi gian ...
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Hinh 10. Khai bdo vdt lieu phdi
+ Cudi cung tien hdnh chay ehuong trinh vd thu dupe eae kit qud md phdng:
- Su thay doi chiiu ddy phdi nhu hinh 11:
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Hinh 11. Do biin mdng Hinh 12. Bieu do trang thdi bin cua vdl lieu sau dap cua chi Hit sau ddp - Ket qua ve trang thai ben eua ehi tiSt + Kit qud ve ieng sudt chinh sau ddp nhu nhu hinh 12: hinh 13:
Hinh 13. Biiu do ung sudt sau ddp + Biiu do cdc luc chuyin dgng trong qud trinh dap nhu hinh 14
4. KET LUAN
Thdng qua cac ket qud ve trang thai ben cua chi tiet nhu hinh 12, cd the khang dinh ve eo ban chi tiet ddm bao ben.
Thdng qua cdc ket qud ve iing sudt ehinh sau dap nhu hinh 13 ddi chiiu vdi gid tri umg sudt eiia vat lieu DQSK36 ta thdy chi tiet sau dap van dam bao ben khdng bj pha buy,
Hinh 14. Biiu do cua cdc luc dgp
Thdng qua md phdng sd qua trinh dap thiiy tmh chi tilt dang dng bdi phdn mem ETA/DYNAFORM ta cd thi xdc dinh dupe phan bd cac viing bien dang khac nhau tren sdn phdm, iing sudt, trang thai ben cung nhu chdt lupng san pham. Lfng dyng md phdng so cho phep phdn tich ehinh xac trang thai iing sudt, trang thai ben, bien dang ciia vat lieu.
Dua vao kit qud md phdng ngudi thiet ke co the ddnh gid tdng qudt qua trinh tao hinh, du
88
doan trudc ehdt lupng san phdm, ddng thdi biln dang nhu nhan, rdch hay cd kha nang bi ti-anh dupe ede anh hudng xdu, cac sai bdng dan hdi Iai. Tir dd nhanh chdng tdi uu hda ket Idm pha buy vat lieu phdi trong qua trmh cdu khudn ciing nhu thdng sd bien dang.
TAI LIEU THAM KHAO
1. Dinh Van Phong, Le Trpng Tdn va Lai Dang Giang (2008), Nghien cieu dnh hu&ng cua dp luc ep bien din qud trinh ddp vudt thuy ca. Tap ehi Khoa hpe ky thudt, Hpc vien Ky thuat quan su.
2. Dinh Ba Tru (2004) Gido trinh Phuang phdp phdn tu hieu hgn trong hy thudt ca khi, Nha xudt ban Hpe vien Ky thudt Qudn sir. Ha Ndi.
3. ETA/DYNAFORM help.
4. Nguyen Thi Thu Trang (2016), Mo phong so qud trinh ddp thiiy ca chi tiit dgng vd mong.
Tap ehi KH Ndng nghiep Viet Nam, tap 14, sd 9: 1435-1440
5. Pham Van Nghe (2006), Cong Nghe Ddp Thuy Tinh, NXB Bach Khoa Hd Ndi.
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