NGHIEN CUfU-TRAO D | NGHIEN CLTU B A N G TIA Nifdc CONG NGHE GIA C O N G A P SUAT CAO T R O N H A T MAI 'ThS Bui Tiln SOn, IS Pham Vdn Bdng, 'ThS Nguyin Vilt Hiing GS.TS Tran Vdn Dich, 'TS Hodng Van Gpt 'Trfldng Dai hpc Cdng nghi|p Hd Ndi -Trfldng D^i hpc Bdch khoa Hd Npi 'Vi|n Nghiin eflu Co T6M TAT PhUdng phdp gia cdng bang tia nUdc dp sudt cao (TNASC) trdn hqt mdi la mdt phUdng phd cdng phi truyen thdng vdi nhieu Uu diem nhU: khdng gdy biin dang nhiit vung gia cdng, gia cdng ddi di ddng cdc loqi vdt lieu cUng cao, khdng gdy xUdc be mat pa cdng nhU cdc phUdngphdp g cdt ggt truyin thdng khdc Mdi trUdng ldm viic cdng da dang hdn: khdng khi, nUdc, viing di chdy no bdo ndy ndi ve viec xdc dinh cdng thUc thUc nghiim bieu thi moi quan he chieu sdu cdt phd huy vd dich chuyen ddu cat vd lUu lUdng hqt mdi gia cdng vdt lieu C45 si( dung hqt mdi Superin Gar ABTRACT Abrasive waterjet (AW}) is a non-conventional machining method with many advantages s as not to cause thermal deformation processing area, relatively easily processed materials high scratch the surface without causing processing methods like conventional machining The work env more varied: air, water, or explosive areas This article presents about the determination of the represents a relationship destroyed depth of cut with cutting shift speed and abrasiveflowwhen c C45 using Superin Garnet abrasive TAP CHf CO KHf VlfiT NAM V S6 (Thdng |jiaft2ttUL NGHIEN c a u TRAO D6I LM6DAU vung: vung cat chat Iflpng (smooth zone) vd vung tao spe (striation zone) Gia cdng bdng tia nfldc dp suat cao Id mpt phUdng phap gia edng mdi, qud trinh gia cdng diipc thflc hi$n bang each sfl dung ddng nflde dp suat cao dl eat Phfldng phdp ndy ed t h i thflc hi|n bdng ddng nfldc dp suat cao thuan hode tia nfldc ap sudt cao cd bd sung hat mdi Hat mdi vdi cdu true hat nhd, eflng va nhilu cginh sde, dflpc trpn Ian vao tia nfldc, dd, se dflpc tia nfldc truyin cho nang Iflpng dfldi d^Jig ddng ndng Nhflng hat mai mang ndng Iflpng (dpng nang) ldn gidng nhfl dung cu cdt nhilu Ifldi se Id tdc nhdn chinh cua qua trinh gia cdng cdt gpt vat Ii|u w Hinh 2: SU hinh thdnh chiiu sau pha huy thay doi lUu Iflpng hat mai Cdn cfl vdo nguyen ly tao tia, TNASC dupc chia thdnh hai loai tia: Tia nflde dp sudt eao thuan (Pure waterjet - WJ) vd tia nfldc dp suat eao trpn hat mdi (Abrasive waterjet - AWJ) Nang suat va chat Iflpng bl mat gia edng phu thupc vdo nhilu ylu td, do, chieu sau cat phd huy (hinh 1) - biiu hi|n eho ndng suat eat ed mdi quan he vdi tdc dp cat (tde dp dieh ehuyln cua vdi phun) vd lflu Iflpng hat mai Trong pham Can cfl theo phflong phap trdn, tia nfldc vi nghien cflu cfla minh, tde gid tap trung vdo vile cd trdn hat mai dflpc ehia thdnh loai sau: Tia nghiin cflu dnh hfldng cua Iflu Iflpng hat mdi nUdc trdn hat mai khdng dp (Abrasive Water Invd tdc dp dich chuyin cua dau eat din ehilu sau jection Jet - AVVIJ) vd tia nfldc trdn hat mdi cd dp cdt phd buy vdi vat lieu C45 Id loai vdt lieu thdng (Abrasive Water Supspension Jet - AWIJ) dung 2.THf NGHIEM VA XlT LY KET QUA 2.1 Khoang khao sdt Bflde dau tiln tiln hanh thi nghiem dd la phai xae dinh dflpc ma tran thflc nghiim vdi thdng sd thay ddi PhflOng trinh quan he gifla ehilu sdu cat phd huy H vdi vdn tdc dich chuyen eua vdi phun V va lflu Iflpng hat mdi Q cd dgjig: H=f(V,Q) Tfl bdng kit qua thi nghiim cd dflpc ta nhdn xet rang khodng khao sat hpp Iy gidi han dflpc chpn la khoang V = 60-120mm/ph vd Q = Chiiu sdu pha hiiy ehinh la ehilu sdu cat 4-lOg/s Ta xdy dflng nen dilm khdo sdt tflOng ldn nhdt md tia nfldc cd t h i dat dflpc bao gdm ea flng nhfl sau: Hinh 1: So dd phflong phap trpn h^t mai khdng dp « vuit irw^nr XTA •*• QA '~lt^y.-yf n-1 f n: So thi nghiim y: Gid tri eua eac thi nghiem ]\ : Gia trj ham hdi quy thflc nghiim I.(.y.~yr~'Z(y,-yy Suy ra: r = - (6) i:(y:'yr De thuan tien cho viec danh gia dp tin cay theo cong thiJc (6), sau tinh toan cac gia tri hoi quy thilc nghiem ta lap bang TAP CHl CO KHi VIETNAM • Hinh 6: Quan he giiia H vdi cic thfing s6 cua chS id cj, y, Q S6 (Thdng nam 2012) NGHIEN CtfU T R A O D O I 3.KETLUAN Chi& sau cat pha huy cua vi$c gia cong bang TNASC trgn hat mai Superin Garnet vdi cac thong so thi nghiem: ap suat 250Mpa; voi phun dil6ng kinh 0,76; toe cit Irong khoang 60- 120mm/ph; lilu lUdng hat mai 4-1 Og/s tuan theo cong thiic; H = 53,4195 V ' ^ ^ Q " ' " ^ ' Til kft qua niy ta thSy: - Chieu sau pha buy H ti le thuan vdi liiu lUdng hat mai Q va ti le nghich vdi toe dich chuyen ciia v6i phun V - De gia tang chieu sau cat thi ta cd the; tang luu lUdng hat mai hoac giam van toe dich chuydn cua vol phun Tuy nhi^n, chi cd the tang lUdng hat mai den mot miic nhat dinh de tranh tinh trang mon voi phun va tiet kiem hat mai Ngoai ra, cd the phoi hop dieu chinh liiu liidng Q va van toe V de dam bao tinh kinh te gia cong • Tai lieu tham khao: [1] Chu Ngpc Chieu; Cong nghe gia cong bang tia ap liic cao 12] Bili Tien Dat; Nghien cilu anh hUdng ciia hat mai den chat lUclng gia cong thep hijp kim dung cu bang tia niI6c ap suat cao PI TrSn Van Dich (2003): Nghien ciiu dd chinh xac gia cdng bang phuong phap thiic nghidm Giao trinh Cao hoc, Khoa Co khi, TrUdng Dai hpc Bach khoa Ha Ndi NXB Khoa hpc Ky thuat W Iran Anh Quin (2003): Nghien cilu cdng nghe tia nUdc ap suit cao lim sach cdng nghiep Luin an jTiln si Khoa hpc Vien May va Dung cu Cdng nghiep (51 Tran Ngoc Hiing (2005): Luan an Tife si Ky thuat Tnidng Dai hpc Bach khoa Ha Ndi r« n / ^ u i / - r t m f irr^T Mi M i* Sd (Thane nam 2012) ... tao spe (striation zone) Gia cdng bdng tia nfldc dp suat cao Id mpt phUdng phap gia edng mdi, qud trinh gia cdng diipc thflc hi$n bang each sfl dung ddng nflde dp suat cao dl eat Phfldng phdp... ddng nfldc dp suat cao thuan hode tia nfldc ap sudt cao cd bd sung hat mdi Hat mdi vdi cdu true hat nhd, eflng va nhilu cginh sde, dflpc trpn Ian vao tia nfldc, dd, se dflpc tia nfldc truyin cho... bao tinh kinh te gia cong • Tai lieu tham khao: [1] Chu Ngpc Chieu; Cong nghe gia cong bang tia ap liic cao 12] Bili Tien Dat; Nghien cilu anh hUdng ciia hat mai den chat lUclng gia cong thep hijp