IS!r»M!hWc6NG NGHE ANH Hl/dNG CUA CHE DO SUfA D A DEN TOPOGRAPHY BE MAT DA MAI INFLUENCE OF WHEEL CORRECTION MODE ON THETOPOGRAPHY SURFACE OF GRINDING VI/HEEL Nguyen Van Thien, Nguyen Huy Ninh Topography be mat cua da mai la thdng sd dac tnmg cho cau tnichinh hoc cua be mat da mai Nd anh hudng ldc hgc qua trinh mai va kh^ nang cat cua da mai, quyet dinh tuoi ben cua da va chat Iddng be m^t chi dfn iupng bdc kim loai, nham be mat gia cdng, ldc mai, rung dong va tudi ben cda da Topography phu tiet mai Do viec nghien CLTU cac dac thuoc vao dp hat, cau tnic da mai, cdng nghe che tao da mai va che dp cdng nghe sda da Noi dung bai trdng cua Topography da mai va dieu kien hinh chiing la mgt nhi^m Tom tSt bdo nghien cihi cac thong so inh hudng den Topography be mat cda da mai td dua nhflng quyet dmh cong nghf hpp ly 1^ rit can thiet Td khoa: Topography, tudi ben, Idong bdc, dp nham, Ide mai, sda da, mng dpng Abstract vu quan Bai bao nhom tac gia nghien cdu ^nh hddng cua che cong nghe sda da den Topography cCia The grinding wheel surface topography is a parameter that characterizes the geometry of the grinding be mat da mai ccr S LV THUYiT v l QUA wheel surface It affects the amount of metal removal volume, suriaeemughness,grindingforee, vibration TRiNH M N D A M A I VA PHl/CtNG and wheel redress life cycle Topography depends on the grain structure of wheel, wheels manufacturing technology and correction mode of wheel The study of the parameters affecting the surface of the grinding wheel Topographies in order to make a decision technology is essential.The paper presents the effect of correction mode to the surface Topographies of the grinding wheel Keywords: Topography, Wheel redress life cycle, removal volume Surface Roughness, Grinding Force, Wheel Correction, Vibration, ThS Nguyen VanThien KhoaCaktii,TnJdngOaihocCongnghiepHaNpt TS Nguyen Huy Hmh -Tnidng Dal hoc Bach khoa Ha Npi Email: thiendhcn78@gmail.a)m 1.0ATVANDE Qua trinh mai duac thiic hien bang cac laoi cat phan bd ngau nhien tren be mat lam viec cua da mai, tao Ngaynhanbai: 05/01/2014 Ngaydiapnhandang: 18/3/2014 PHAPTOPOGRAPHY 2.1 Mon da mai Mon da mai la mgt qua trinh rat phdc tap Qua trinh mon da la tong hop cua nhieu qua trinh mon khac xiy tai vung cat Cac nghien cdu da dua cd che mon va anh hddng cOa cac yeu to khac den mon da gom: da mai va cac dac tinh cCia nd, phoi, che mai, tddi nguoi va nhieu yeu to khac Viec nghien cdu cd che mon da la cfl Sau mgt thdi gian lam viec, da khong Topography cua da Do tac dgng cua cac lac cat, rung dong va nhiet phat dam bao kha nang cat da dinh, ngUdi ta phai sCfa lai be mat lam viec cua nd Dudi tac dong cua dung cu silTa da (mui kim cuong) cac hat mai bi vo va hinh cac luoi cat sac mdi, mot so hat sinh qua trinh cat, moi mot luoi cat tren be mat cua da mai dan dan bi mon, bj cun Mat khac, cac phoi mai sau bi tach mot phan bam dinh len be mat da lam thay ddi dieu kien mai nam d vi tri khong thuan loi co the bi tach khoi chat ket dinh, cac hat mai mdi xuat hien tao cac ludi cat mdi NhQng hien tifdng tao nen Topography ban dau cua be mat lam cat, giam kha nang cat got cua da viec cua da mai, anh hadng den dong TapdiiKHOAHOC&CONG NGHE So * Um(mm) Kphdl) of ; ~ -^XoL^Ci ""*• ^T Kmh Mdi quan he gifla Iddng mon da vdi thili gian cat OA: giai doan mon ban daujAB: giai doan mdn k dmh; BC giai dogn mon kbocliet SCIENCETECHNOlOGYl sd hdp ly de xac djnh tuoi ben cua da Dien bien qua tnnh mdn da mai tdong t d nhd cac qua trinh mon cua dung cu c^t khac bao gom giai doan (hinh 1), - Giai doan la giai dogn mdn ban ddu: Thdi gian mon ban dau T^ nho nhdng mon ban dau U^ Idn Nguyen nhan la sau sda da mgt so hat mai cd vj tri khong thuan Igi cho qua trtnh cat hoac cac hat mai lien ket khong chat che vdi Cac hat lien tuc bj tach khoi chat ket dinh - Giai dogn Id giai dogn mon on dinh: Thdi gian lam viec cua da dUdc tinh giai doan Do mdn cua da giai doan phu thugc chu yeu vao dac tinh cua tai trgng co nhiet - Giai dogn Id giai doan mdn khdc lietDa mai bj vd manh Idn, xuat hien cd the kem theo chay mai hoac vet gan, can phai tien hanh sda da, Cd the nhin thay tong quat cd co che mon chu yeu: Cun tu hat mai, vd hat mai va tach rdi hat mai, phoi lap vao cho gida cac hat mai Tuy thugc vao dieu kien mai co the xay cac dang mdn sau (hinh 2): - Hat mai nam d vi tri khdng thuan loi tren be mat da hoac ddoc gid khdng chat bdi chat ket dinh, dddi tac dung cua ldc cat chung bj tach khdi be mat da Nd cd the xay theo be mat lien ket (gay cau lien ket) sda da hoac hat mai bj pha huy ve the tfch - Cac canh va dinh cua nhdng hat mai nhd nhieu nhat mgt phan bi vd vun vang khdi hat mai, mgt phan bi mon va bi li ma sat vdi be mat chi tiet gia cong Tren be mat hat mai xuat hien cac dien tfch phang bj mdn gay khd khan cho hat mai an sau vao be mat gia cdng - i^at mai bj vd meinh Idn - Hat mai bi vd nhieu m^nh nho, tao nhieu Iddi cat sac hon - Phoi cat cung vdi manh vun hat mai va chat lien ket bi mon roi vao cac 16 hong cua da va bit kin chung lam mat cac gdc c^t cua hat mai, khS nang luan ehuyen phoi lam giam tinh c^t ggt - Kim loai gia cong ngdng ket hoac tac dyng hoa hgc vdi vat lieu hat mai bj dinh vao cac dinh hoac tren be mat cac hat mai - Khi cac hat mai bj vd va bi roi ra, dd be mat lam viec da mai se hinh cac Iddi cat mdi, de lg cac Idp hat mai mdi, sd khoi phuc kha nang cat ddoc gpi la tinh ty mai sac cua da mai Cac dang mdn tren xuat hien dong thdi qua trinh mai, nhien thugc vao dieu kien gia cong cu the ma mgt dang mon nao the hien rd nhat nang cao tinh cat, tuoi ben cua da mai va md rong kha nang cdng nghe cua da mai, gop phan nang cao chfnh xac va chat Idgng be mat gia cdng Qua trinh sda da gdm hai giai doan: Tao bien dang va lam s^c, -Tao bien dang da la lam cho da mai cd mgt bien dang chinh xac phu hdp bien dang cua chi tiet can gia cdng - Lam s^c la qua trinh tao kha nang cat cho da mai bang each thap cao Clia chat ket dinh tren chieu cao bien dang da de tao cac ranh thoat phoi va lam cac hat mai (Iddi cat) nhd cao khdi chat ket dfnh tao cac ludi cat tren hat mai vd cdc tap (hdt 2.3 Phirong phap Topography Tap hgp cac loi ldm cCia mgt be mat da mai duoc xac dinh khong gian ba chieu vdi nhdng dac trdng cy the cua no thi dugc goi la Topography cua da mai, De danh gia Topography cua da mai, ngudi ta da dda cac thdng so mo ta dac diem chfnh, nhdng net dac trdng cua Topography be mat da nhd: Can bae hai cua sai lech trung binh binh phuong (5 ), chieu cao nhap nho trung binh cua be mat (S^), lech phan bo chieu cao be mat (S^J 2.2 Sdra da mai Viec sda da mai nhiim muc dich tao bien dang ciia da mai, khdi phuc lai chinh xac ve hinh dang hinh hoc cua da mai sau moi chu ky lam viec cua da, Tao Topography hgp ly cda da nham Topography ludn bien doi qua trinh mai Sd bien doi cua Topography phy thugc vao hat, cau true da mai, cdng nghe che tao da mai, vat lieu da mai, dang Topography khdi thuy dat ddgc sau sda da, t i i ca nhiet ^r-: Hinh Cac dang mdn cua da mai a) hot mai bi ciin, b) hat mai bi va tilng manh nhd; (j hat mdi bi va manh Idn; d) hat mai bi trdc; e) hat mdi bi mdt goc cdt; g) hat mai bi che lop bdi phoi Oen laser birdrc song lien tyc KtioangcJchiCr< (Jen be rn9i da n\ Cam bien laser tam giac J0 n ^ o*> ? -1/X, ^ ^ f \\^~m T ,^u kmh i X Cam bien v| tri (PSD) '-''' < • o / // , \ Ban m^v chuven ddng hai pht/ang dong dong CO birdc Gia (5& cam bien tuin vj Iri Hinh 3, Nguyen ly Topography da mai sill dung cam bien laser So21.2014ãTapdiiKHOAHOC&CONGNGHE'i: IM!fôyjlilằIilC6NG NGHE tac ddng tren hat da mai, tren chat ket dinh va phy thuoc vao vat lieu gia cdng, che cong nghe mai cung nhu dgng luc hgc qua trinh mai, tinh trang dinh bam phoi tren be mat da mai Topography anh hddng trdc tiep va quyet dinh den kha nang cat, lUc cat, rung ddng qua trinh mai, mdn da, tuoi ben cua da va chat Idgng be mat chi tiet gia cdng, Trong qua trinh mai viec xac dinh duoc Topography cua be mat da mai cd the giup cho nha cdng nghe nghien cdu dddc anh hddng cua che cdng nghe sda da den Topography, tCr dd, quyet dinh ddgc thdi gian sda da va che sda da (chieu sau va bddc tien) phu hgp Trong ngi dung bai bao nhdm tac gia sd dung phUdng phap trdc tiep bang cam bien laser dUdc thdc hien theo nguyen ly nhu hinh 3 TRANG THIET Bj TH[ NGHl|M • Thiet bj Topography: Sd dyng dau laser ZX-LD30V, bd Ampliphier Hinh So nguyen ly Topography be mat da mai ZX-LDAl cua hang OMRON (hinh4) cd cac thong so: khoang each cam nhan Dai Loan cua dau 30 ± mm; tan so 150ps; • Dung cu siia da: Oau sda da kim phan giai 0,25 pm cdong loai hat cd kich thude: 8,5x40 - Phan mem do: Smartmonitor.ver 2.0 TIEN HANH THI NGHIDM VA XlT - Nguyen ly do: Nhu hinh 5, vdi cac Vi 50 Lifu ehuyen ddng: Tien hanh thi nghiem vdi che sda + Chuyen ddng quay da mai: Sd da S^^, t^j thay doi tai diem thi nghiem, dung ddng ccj servo ma hieu: SGMAH- Sau sda da tien hanh Topography 02AAA21, cdng suat 0,2 kW, toe toi be mat da mai Ket qua thu ddgc da 3000 v/p Bd dieu khien Servopack qua phan mem Smart Monitor la bang SGDP-02AP Tan so lay mau t = 10ms, dd lieu excel dddi dang file exeei.esv Hinh Thlet bi thi ngtiiem Topography be bddcdoS^^^lOOnm Tren ccJ sd cua phan mem MatLab va mat da mai + Chuyen dpng doc true da cua Bang 1, Ket qua thi nghiem Topography be mat da mai WA60.150x13x31,75 dau do: Sd dung dong ca servo ma Thong so dac trung Topography Bien ma hoa Bien thifc nghiem hieu: DCM50202-02-1000MS12, cdng STI suat 0,08 kW, tdc toi da 2000 v/p Bd Si S, S,.(m/ph) t5d(mm} X, Xi dieu khien MODEL: DC5810 Bddc -0,434 0,123 -1 -1 0,5 0,01 0,575 S^ - 50pm Thiet bi thi nghiem tren may -0,457 0.131 -1 0,01 0,591 1,5 nhd hinh -0,4!1 0,133 -1 0,5 0,03 0,712 - Phan mem xd ly: MatLab, MFC ^iffra s, • May: Thi nghiem tren may mai dung ey: ATC-40M Dai Loan, cdng suat N = 1,1 kW, tdc dp n^^ = 3400v/ph, Da mai: WA60.150xl3x31,75 cua TapdiiKHOAHOC&CONGNGHE S o 4 1 1,S 0,03 0,721 0,135 -0,393 0 0,87 0,02 0,65 0,124 -0,349 0 0,87 0,02 0,658 0,124 -0,342 SCIENCETECHNOlOGYl Ta CO [X).[B] = [Y] ^ [X]'.(XJ.[B1 [xr.[Y].Dat[M] = [X]'.tX] Suy nghiem cua he la [B]=[IV1]' M'.CYl - Xac dinh phadng trinh S^: CHUONG TRINH DO TOPOGRAPHV BE MAT DA MAI -0,693 -4,605 ^ 0,405 -4,605 0,693 -3,507 Vdi m a t r a n [X] = 0,405 - 3,507 -0.139 -3.912 -0.139 -3.912 0,553" 0,526 0,340 0,327 0.431 0.419 0,3156 giai he ta CO nghiem [B] = 0,0172 0,1862 Hinh Ket qua tinh toan cac thong sd dac tri/ngTopography be mat da mai bang phan mem l^atLab (S^^ ^0,5m/ph,t^-0,01mm) Thay vao phirong trinh (1) va bien doi ta CO; ^ S , = eằ-='5ô.s^"'".t"-"'ã2=1,3711 " So •TapdiiKHOAHOC&CONG NGHE |HQ*SS:BSCONG NGHl - Xac dinh phuang trinh S -0,693 V&i ma tran [X] = ^ • -4,605 0,405 -4,605 -0,693 -3,507 -3,507 0,405 -0.139 -3.912 -0.139 -3.912 Hinh 9.06 tiii quan iie che sita 6t {S^/J vdi cac thong so Sac tritng cua Topography (S^ S^, S^) Si mJi -0,835" WA60.!50xl3x31,75 -0,783 c h o T o p o g r a p h y cua b e m a t d a v d i c h e -0,732 d o c d n g n g h e sifa d a , t a c d t h e t a o -0,934 d u g c T o p o g r a p h y k h d i t h u y m o t each [Y] = h d p iy l a m t a n g kha nang cat g o t cua -1.053 [5] Nguyen Doan Y, 6iao trinh Quy hoach thuc nghiem, NXB Khoa hoc va Ky thuat Ha Npi [2O00) da, k e o d a i t u o i b e n c u a d a m a i , g i a m -1.073 -1,148 giai he ta CO nghiem [8] = -0,0696 -0,059 Thay vao p h i ong trir h ( [4] Li/u Van Nhang, Ky thjat mai kim loai, NX8 Khoa hoc va ky thuat, Ha Noi (2003) ) va b en doi ta co: Phuong phap Topography be mat cja da m^i c h o viec n g h i e n ctfu p h u o n g p h a p d ^ m bang cam bien laser Tap chi KH&CN trirclng DH Cong b a o chat lUdng b e mat, n a n g suat va nghiep Ha NOI (2013) hieu q u a gia c d n g t r o n g qua t r i n h mai, 0,3173 of two models to predict grinding forces from toi chi de cap d e n a n h h u d n g cua c h e wheel surface topography" (40), Machine tools and che cong nghe sCfa da (S^^,tJ cac Manufacture, pp.1099-1120, (2000) b e m a t d a v a d U a dUOc b i e u t h i f c q u a n h e giCra c h i i n g Cac v a n d e n g h i e n TCf bang va hinh ta thay, l