NGHIEN Cl>U-TRAODOI V N G H I E N CLPU THLfC NGHIEM O^ XAY DLPNG BO THONG S6 CONG NGHE KHI GIA CONG VAT LIEU Cr TREN MAY C A T DAY TIA LCPA DIEN CNC DEM 320 EXPERIMENTAL RESEARCH TO BUILD THE SET OF TECHNOLOGICAL PARAMETER IN THE PROCESS OF MACHINING Cr MATERLVLS ON 320 EDM CNC ELECTRIC-SPARK WIRE MACHINE ThS Do Anh Tuan, ThS Trinh Thi Mai TrUdng Dai hoc Kinh te Ky thuat Cdng nghiep TOMTAT Phddng phdp gia cong tia Ida dien noi chung, phUdngphdp gia cong cdt ddy tia Ida dien CNC noi rieng, dd dUOc dp dung td lau vd dUdc biet den nhU Id mgt cdc bien phdp cong nghe quan trgng cua gia cong hien dgi Phddng phdp gia cong ndy, co nhieu Uu diem vd hieu qud kinh te tddng doi cao; cho phep gia cong dUdc nhieu dgng be mat khdc vdi chinh xdc cao, ddc biet Id gia cong dUdc nhdng vdt lieu cd cdng cao md khong gap bdt cd trd nggi gi Tuy nhien, mgt cdc yeu to chinh quyet dinh tdi hieu qud kinh te ciia phUdngphdp gia cong ndy, Id Idm the'ndo thiet lap dUdc thong so cong nghe hdp ly gia cong de vda dam bdo dUdc chat lUdng sdn phdm, vda ndng cao dUdc ndng sudt gia cong Bdi bdo, trinh bdy ket qud nghien cdu tU viec gia cong thUc nghiim tren mdy cdt ddy tia Ida diin CNC DEM320, qua dUa dUdc bg thong so cong nghe hgp ly tren mdy, giup tdng ndng sudt gia cong TU khda: Cdt day tia Ida dien CNC; Thong sd cong nghe ABSTRACT Electric-spark processing method in general and CNC electric-spark wire cutting processing methods in particular has been applied a long time It is known as one of the important technological solutions of modern machining The method has many advantages and relatively high economic efficiency A lot of different surface types can be processed by this method with high accuracy Especially, it also allows to process materials having high rigidity without any obstacles However, one of the main factors deciding economic efficiency of the processing methods that is how to establish reasonable technological parameters to both ensure product quality and improve machining productivity This paper presents the research results from the experimental processing on 320EDM CNC electric-spark wire cutting machine to offer the set of appropriate technological parameter on the machine to help increase productivity Keywords: CNC electric sparks wire cutting; Technological parameters ISSN 0866 - 7056 TAP CHi CO KHi VIET NAM, So nam 2016 www.cokhivietnam.vn NGHIEN C l i u - T R A O D O I MO DAU Gia cdng cat ddy tia Ifla difa CNC la mpt nhflng phflang phdp gia cdng mdi, dflpc flng dung nhilu ngdnh Chi tao co khi; ddy cung la mpt phflong phdp gia cdng tiln tifa dfloc dp dung dung de che tao va gia cdng nhflng chi tift cd dp phflc tap cap, nhflng chi tift cd dp cflng khdc tfl nhd dfa ldn ma cdc phfldng phdp gia cdng khac khdng lam dflpc hay nfa lam dflpc cung mdt kha nhieu thdi gian va chi phi Che dp cdng nghe gia cdng chi tilt trln mdy cat ddy tia Ifla difa CNC phu thupc rat nhilu vdo vdt Mfa chi tift gia cdng (tmh dan difa, dan nhift ) Do dd vile van hdnh mdy cung nhfl Ifla chpn dfloc cac thdng sd gia cdng hpp ly dl gia cdng chi tift thflc te la mpt difa rat quan trpng, nham tang nang sudt gia cdng De tdi dfla dflpc kit qua xdy dflng thflc nghilm ve bd thdng sd cdng nghe gia cdng chi tilt trfa may cdt day tia Ifla difa CNC DEM320, nhdm tang ndng sudt gia cdng vflng ciia day cat, mdy phat difa tan sd cao, thdng dilu khien thi may cdn cd flu diem la t dp cat ldn, dd bdng cao, tm cdy va tinh i dinh cao Vdi nhifa tinh nang cat gdn gui vdi may cat day truyen thdng EDM (EDM sfl du ddy cat bang ddng, DEM sfl dung day cat ba molipden) Dd la sfl cdi tiln dang kl ve tdc cho may cat day NOI DUNG 2.1 Gidi thifa ve mdy cat day tia Ifla dien CNC DEM320 - Mdy la thiet bi tdt de cat cdc vat lieu dp cflng cao, thep cac-bon va cdc vat hfa dac b de che tao khudn - Mdy cd the dflpc sfl dirng de cat n« cdc bifa dang phflc tap ma mdt sd mdy thd thfldng khdng the xfl ly dflpc Vi du: Gia cd cdc chi tift cd rdnh rat nhd, sdu Hoac cac hinh ndn tfl 0"-30° 2.1.2 Thong s6 ky thuat cua mdy 570x350 mni Chieu day phoi cat 16n nhat 300 fnm Trong liiong phoi cat 16n nhat 500 H Hanh trinh true X 320 mm Hanh trinh true Y 250 mm Hanh trinh true U 55 rmE Hanh trinh true V 55 mm Toe cat 1cm nhat 180 nmf/c Kich thridc ban may Nhip dl ehuyen 0.001 nui DilcJng kinh day c^t 0,18 mn Khoang day 0,25 mn DUcJng kinh ru 16 180 ran Hanh trinh di chuyen 1cm nhat eua ru 16 230 mn Cong suat dong ccf ru 16 370 W Do nham be mat 0,8-1 \m Ktnh J May cdt ddy tia Ida dien CNC DEM 320 2.1.1 Cng dung He dieu khien DEM320 la mdy cat ddy tia Ifla dito CNC, tdc dp cap dflpc dp dung cho kha nang cat phdi dat kich thfldc chinh xdc, dp bdng cao vd cac chi tift cd bifa dang cdn phflc tap Dfla trln sfl bfa DM-XPCNC Cong suat toan may 4,5 Kich thil6e toan may 1300x1800 X2100 Trong luong ISSN 0866 - 7056 E l TAP CHl CO KHI VIET NAM, S6 nam 2016 www.cokhivietoani.vn 1500 KV k NGHIEN CO'U - TRAO eOl 2.2 Qua trinh thifc nghiem - Cac tham so bao gom; (Ton), (Toff), (IP), (Toe day cat) 2.2.1 Lda chon doi tUdng thUc nghiem, phddng phdp thdc nghiem - Doi tnqng thdc nghiem dUdc lUa chpn (i day la: Hinh Thdi gian gidi chu ky bat vd tdt xung nhip + LUa chgn vat lieu thiJc nghiem: Cr + May tien hanh thUc nghiem: DEM320 - Phiidng phap thiic nghiem: Tien hanh cat contour phang cac san pham mau 2.2.2 Bdng ket qud thdc nghiem bg thong so cdng nghe gia cong vat lieu Crom vdi chieu ddy khdc Trong do: + Ton: Thcfi gian bat xung nhip (dai tif - 127); + Toff: Thdi gian nghi xung nhip (dai - 1027); + IP: Gia tri cao diem cho lan xung (dai 1-10) DUa vao dac tinh ky thuat chinh cua may DEM320, de tang nang suat gia cong cat gpt ta can cut chu yeu vao cac tham so chinh qua trinh cat cua may - Qua viec gia cong thifc te tren may DEM320, tac gia diia dUdc bang ket qua thUc nghiem bg thong so cong nghe gia cong vat lieu Cr: gl Vdt lieu: Cr - Chiiu ddy vdt Ueu: 5mm Tham so dieu chinh Muc Ton Toff IP Tdc cuon day 40 200 40 10 60 30 12 20 10 20 Thdng sdbu Cat lan dau Cat lai lanl Cat lai lan Cat lai ldn 0.1 0.13 0.152 0.157 0.09 0.112 0.117 0.092 0.097 +0.005 11 0.092 Dp chinh xdc +0.005 +0.005 Hifa qua 35 20 ISSN 0866 - 7056 TAP CHI CO KHI VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN CLfU - TRAO D O I g2 Vdt lieu: Cr - Chiiu ddy vdt lieu: 10mm Tham sd di^u chinh Muc Ton Toff IP Tdc cuon ddy 40 200 40 10 60 30 12 20 10 20 Thdng so bit Cat lai Ian Caiai Ian Catldn ddu Catl^ Idnl 0.1 0.127 0.145 0.15 0.087 0.105 0.11 0.085 0.09 0.085 Do chinh xdc +0.005 +0.005 +0.005 Hieu qua 48 30 17 Bang Vdt lieu: Cr - Chieu ddy vdt lieu: 20mm Tham sd dieu chinh Muc Ton Toff IP Tdc cudn day 40 200 40 10 60 30 12 20 10 20 Thdng sdbu Cat Ian ddu Cat lai Idnl Cat lai lan Cat lai lan 0.1 0.122 0.135 0.142 0.082 0.095 0.102 0.075 0.082 0.077 Dp chinh xdc +0.005 +0.005 +0.005 Hieu qud 80 55 35 g Vdt lieu: Cr - Chiiu ddy vdt liiu: 5mm Tham sd dieu chinh Ton Toff IP Tocdd cudn day 40 200 40 60 30 10 12 20 10 20 Muc Thong sdbu Cat Ian dan 0.1 Cat lai Idnl Catiji Ian Catlai Idn 0.1 0.137 0.14 0.08 0.097 0.10 0.077 0.08 0.075 Do chinh xac +0.005 +0.005 +0.005 Hieu qua 85 65 44 ISSN 0866 - 7056 TAP CHl CO KHi VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN CLfU-TRAOD6| Bang Vdt lieu: Cr - Chiiu ddy vdt lieu: 40mm Tham sd di^u chinh Mac Ton Toff IP Tdcdd cudn day 40 200 40 10 60 30 12 20 10 20 Thdng sd bu Cat Idn dau Catlai Idnl Catlai ldn Cat lai lan 0.1 0.12 0.13 0.14 0.08 0.09 0.1 0.07 0.08 0.075 Dd chinh xac +0.005 +0.005 +0.005 Hi$u qua 88 70 50 Bdng Vdt lieu: Cr - Chiiu ddy vdt lieu: 70mm Tham so didu chinh Muc Ton Toff IP Tdcdd cudn day 40 200 40 10 60 30 12 20 10 20 Thdng sd bu Cat ldn ddu Catlai Idnl 0.1 Catlai ldn 0.13 0.13 0.13 0.09 0.09 0.09 0.07 0.07 0.065 Dp chinh xdc 114 Hieu qua Catlai Ian +0.005 +0.007 +0.005 80 63 53 Bang Vat lieu: Cr - Chiiu diy vdt lieu: 100mm Tham sd dieu chinh Ton Toff IP Tdcdd cudn ddy 40 200 40 10 60 30 12 20 10 20 Miic Do chinh xdc Hieu qua Thdng sd bit Cat lan dau Catlai Idnl Catlai lan Cat lai 0.1 0.13 0.127 0.13 0.09 0.087 0.09 0.067 Idn 0.07 0.065 -0.01 +0.005 +0.007 ±0.01 83 63 53 ISSN 0866 - 7056 TAP CHl CO KHI V I £ T NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN C l i u - TRAO D O I 2.3 Ket qua vd thao ludn KET L U A N Vdi phddng an thdc nghiem, gia cdng D i & khien Unh hoat bp tham sd gia cor thdc te chi tiet tren may cat ddy tia Ida dien CNC chinh qua trmh gia cong chi tidt, ddpc o DEM320, qua trinh van hdnh, tiep can vd la yeu td quyet dinh qua trinh vdn ban nghien cdu, kem theo dd la nhdng sdn pham da mdy, giup tang nang sudt gia cdng, tang hieu qi gia cdng cu the Tac gid da dila dddc bp thdng stf dung day cat, tang dp bdng bd mat chi ti^ sd cdng nghe gia cong vdt lieu Cr tren may giam thieu nhdng ydu td lam dnh hudng ddn qi cat ddy tia Ida dien CNC DEM320 va rut ddpc trinh gia cdng mdt sd kinh nghiem cua ban thdn van hanh va sd dung mdy de tang ndng sudt cat got, cu the: Crpm la Ipai vdt lieu cd dp cdng cao, < + Khi chieu day cua phdi ldn, thddng kha ndng chdng mai mdn tdt, ddpc dng dut chpn xung rpng, ddng ldn, bddc tien cat cham, nhieu nganh Co Viec gia cdng C bang cdc phUdng phap gia cdng truyen thdn tdc dp day nhanh; ddi hdi chi phi ldn, ndng sudt vd ehdt Idflng g + Khi phdi mdng chpn xung nhd, ddng cdng khdng cao, ddc biet la cdc bd mat phdc ta nhd, bildc tidn cat nhanh; Khi gia cdng bang tia Ida dien, tinh dan dit vd nhiet cua Cr khac so vdi vdt lieu thdng thddi + Khi cdn gia cdng tinh, chpn xung nhd, khac, nen lam cho nang suat va chat Idpng g ddng nhd, tdc dp ddy cat nhd cdng thay ddi Vi vdy, viec nghien cdu bai thdc nghiem dd dda bd thdng sd cdng ngi Ket qua thdc nghiem bd thdng sd cdng gia cdng vdt Meu Cr cd y nghia rat ldn c nghe gia cdng vat lieu Cr d tren, hoan todn nghien cdu thdc nghiem gia cong cdc chi tiet cd the md rdng pham vi dp dung lam tien de d l dd cdng cao • gia cdng cho cac chi tiet vdi vat Heu khdc Ngay nhdn bai: 21/3/2016 Ngay phdn bien: 17/4/2016 Tai lieu tham khao: [1] PGS,TS Vu Hoai An (2007); Gia cdng tia Ida dien CNC, NXB Khoa hpc va Ky thuat [2] Dinh Wn De; PhUdngphdp gia cdng dgc hilt, TrUdng Dai hpc Cong nghiep TP.H6 Chi Minh [3] Hoang Vinh Sinh; Nghien cdu dnh hUing cua chilu day phdi vi dd dii xung din nham be mdt cdng chi tilt bdng cat ddy tia Ida diln Tap chi Khoa hpc va Cdng nghe, Dai hpc Da Nang, sd 42 nam 201 [4] LUu Ddc Binh; Nghien cdu dnh hudng cia cdc thdng sd cdng nghe den nang sudt gia cong bang ca tia Ida dien, Tuyen tap cdng trinh khoa hoc Hoi nghi Co hpc Toan qudc lan thd 9, tap 4, 2013 [5].http://www.wgm-maschinen,de/Knuth-Machines ISSN 0866.7056 TAP CHI CO KHi V I £ T NAM, Sd nam www.cokhivietnam.vn 2016 ... W Do nham be mat 0,8-1 \m Ktnh J May cdt ddy tia Ida dien CNC DEM 320 2.1.1 Cng dung He dieu khien DEM3 20 la mdy cat ddy tia Ifla dito CNC, tdc dp cap dflpc dp dung cho kha nang cat phdi dat kich... thuat chinh cua may DEM3 20, de tang nang suat gia cong cat gpt ta can cut chu yeu vao cac tham so chinh qua trinh cat cua may - Qua viec gia cong thifc te tren may DEM3 20, tac gia diia dUdc bang... tia Ida dien CNC DEM3 20 va rut ddpc trinh gia cdng mdt sd kinh nghiem cua ban thdn van hanh va sd dung mdy de tang ndng sudt cat got, cu the: Crpm la Ipai vdt lieu cd dp cdng cao, < + Khi chieu