ảnh hưởng của chế độ cắt đến topography bề mặt đá mài

NGHIEN ciiu-TRAO DOI ^ANH HUONG CUA CHE DO CAT DEN TOPOGRAPHY BE MAT DA MAI THE EFFECT OF CUTTING PARAMETERS ON TOPOGRAPHY OF GRINDING WHEEL SURFACE ThS Nguyen Van Thien', TS Nguyen Huy Ninh\ GS,TS Trin Van Dich'Trudng Dai hpe Cdng nghiep Ha Ndi -Trudng Dai hpe Bach klioa Ha Ndi TOM TAT Bdi bdo ndy frinh 6ay nghien ciru dnh huang ciia chi cdt din Topography bi mat da mat mdi phdng Noi dung cua bdi cung trinh bdy phuang phdp nghiin cini bdng thuc nghiem vd xu ly sd lieu de dua mdi quan he giita chi cat vai mdt sd thdng sd dgc trung ciia Topography Tit dd lam ca sa cho viec nghien ciru vi Topography be mat cua dd mdi vd dnh huang ciia nd din nhdm bi mat chi tiit gia cdng Til' khoa: Topography; Chi cdt; Chieu cao nhap nhd trung binh be mat dd 3D; Mdi phdng ABSTRACT This paper studies the influence of cutting parameters on the topography of the grinding wheel surface In the present study, experimental and data processing methods were applied, thus investigating the relationship between cutting parameters and parameters characterizing the topography of the grinding wheel surface The results of this study may serve as a basis for researches on the effects of the topography of the grinding wheel surface on the surface roughness of processed parts Keywords.- Topography; Cutting parameters; 3D Surface Roughness Medium height; Flat Grind DAT VAN D E ^^ niat cao va gia cdng dugc eac loai vat lieu cd Mai la mdt phuong phap gia eong cd vi tri rit ^o tinh eao Qua trmh mai dupe thuc hien bing quan trpng gia cdng co khi, nd tao dupe so lupng Idn cac hat mai (luoi cit) tren bl mat cac chi tilt may cd dp chinh xae eao, chat lugng lam viec cua da mai tao Topography ciia "^ TAP CHi CO KHi VIET NAM, S6 nam 2014 www.cokhivietnam.vn NGHIEN cuu-TRAO DOI da Dudi tac ddng cua eae lire cat mdi mdt ludi cat tren be mat cita da mai dan dan bi ciin tii, bi vd manh va trdc hat, hmh cae ludi cat sac mdi, ngoai eac hdc nhd tren be mat bi lap mdt phan bdi phoi mai Nhiing hien tugng din den thay ddi Topography cua be mat lam viec eua da mai tuc la thay ddi kha nang cat qua trinh mai, lam anh hudng den tudi ben eiia da va chat lugng be mat chi tiet mai Do dd, viec nghien cuu cac yeu td anh hudng den Topography be mat ciia da mai de gdp phan nang cao tudi ben cua da va chat lupng be mat cac san pham co la van de can thiet Trong ndi dung bai bao, nhdm tac gia da trinh bay nghien euu anh hudng cua che dp cat (V j^ - tdc dp phdi (m/ph), t - chieu sau cat (mm/ htk)) den chieu cao nhap nho trung binh be mat da mai (S^) mai phang v$t lieu thep C45 bang da maiWA60.150xl3x31,75 Hinh 1: Anh chup thiet bj thi nghiem vdphdi tren mdy 2.2 Phuong phap tien hanh thi nghiem Tien hanh thi nghiem Topography be m|t TRANG THET BI VA PHlJONG PHAP TIEN HANH THI NGHIEM da bang phuang phap true tiep sir dung dau 2.1 Trang thiet bj thi nghiem, hinh 2.1 nghiem theo eae budc sau: [2], [5], [9] * Thiet bi Topography: Su dung diu laser ZX-LD30V, bp Ampliphier ZX-LDAl eua hang OMRON, cd cac thdng sd: Khoang each cam nhan ciia dau 30 ± mm; Dp phan giai 0,25 pm[6] - Phan mem do: Smartmonitor.ver2.0 - Phan mem xu ly: Matlab * May: Thi nghiem tren may mai dung cu: ATC-40M Dai Loan, Cdng suit N - 1.1 Kw, tdc ddnj^=3400v/ph *f)a mai: WA60.150x13x31,75 cua Dai Loan * Dung cu su-a da: Dau sua da kim cuang loai hat ed kich thudc: 8.5x40 ^ Vat lieu gia cong: Thep C45 laser vdi che dp cat (V ^, t) thay ddi tai diSm thi Budc 1: Sira da vdi che dp sua da (S^^ = Im/ ph; t^j = 0.01mm), tien hanh Topography khoi thuy bl mat da mai [5], [6], [8] Budc 2: Tien hanh mai phang thep C45, sau thdi gian mai phiit tien hanh Topography be mat da Trong qua trinh mai cu sau phiit lai Topography be mat da cho den thdi gian mai 30 phut thuc hien sura da Budc 3: Ket qua thu dupe qua phan mem Smart Monitor la bang dii lieu excel dudi dang file excel.CSV Tren ea sd ciia phin mim Matlab nhdm xay dung chuang trinh de xir ly sd lieu do, tinh toan cae thdng sd dae trung eiia Topography va xay dung bl mat 3D [4], [6] TAP CHi CO KHi VIET NAM, S6 nam2014 WW w.co khivietnam.vn NGHIEN cuu-TRAO DOI KET QUA THI NGHIEM VA XC LY SO LIEU Bdng 3.1: Ket qud thi nghiem Topography be mat dd mdi WA60.150x13x31,75 Bien ma Bien thirc hoa nghiem Chieu cao nhap nho trung binh be mat da S^ (mm) theo thai gian mai T (phut) TT X, X, (m/ph) t(mm/ Khoi htk) thuy 10 15 20 25 30 -1 -1 0.01 0.658 0.619 0.610 0.609 0.629 0.615 0.645 0.636 -1 O.OI 0.641 0.708 0.687 0.678 0.655 0.677 0.695 0.669 -1 0.03 0.657 0.751 0.715 0.682 0.706 0.698 0.759 0.771 1 0.03 0.641 0.876 0.827 0.745 0.760 0.874 0.892 0.853 0 0.02 0.649 0.781 0.770 0.712 0.670 0.719 0.736 0.757 0 0.02 0.649 0.755 0.736 0.675 0.664 0.709 0.731 0.758 Tir ket qua tren bang 3.1, xay dimg ham chieu cao nhap nho trung binh be mat da S^ (thong so dac trung cho Topography) phu thuoc vao che cat (V ^, t), du doan moi quan he dang ham mir: f(Vp^,t) = k.V ^M'' Tuyin tinh hoa phuong trinh phi tuyen bang each logarit co so e ve cua phirong trinh ta dugc: Ln(f(V„K,t))=to(k)+a.to(V^J+b.ln(t) Dat y=hi(f(V_,,t)), b„=hi(k), b =a, b,=b, x =ln(V^^), x,=ln(t) Suyra:y=bj+b,.X|+b,.x, (1) Ta CO [X].[B]=[Y] -> [X]'-.[X].[B]= [X]l[Y] Dat [M] = [X]l[X] suy nghiem cua he la : [B]=[M]-i [X]l[Y] * Xac dinh phtrong trinh S^tal thoi dilm mai phiit: Bdng 3.2; Sd lieu xu ly kit qud tai thai diem t = I phut Bien ma hoa TT X, X, Bien thirc nghiem S^ V„,(m/ph) t (mm/htk) Ln(V,) Ln(t) Ln(S_) -1 -1 0.01 0.619 1.386 -4.605 -0.480 I -1 0.01 0.708 2.079 -4.605 -0.345 -1 0.03 0.751 1.386 -3.507 -0.286 0.03 0.876 2.079 -3.507 -0.132 0.781 1.792 -3.912 -0.247 0.755 1.792 -3.912 -0.281 0 0.02 0 0.02 TAP CHI CO KHi VIET NAM, Sd nam 2014 www.cokhivietnam.vn NGHIEN cuu-TRAO001 1 , Vai ma tran [^] = 1 1.386 2.079 1.386 2.079 1.792 792 -0.480 - 345 -0.286 [1-] = -0.132 - 0.247 -0.281 -4.605 -4.605 -3 507 ; -3.507 -3.912 -3.912 0.0845 Giai he ta cd nghiem [B] - 0.2097 0.1864 Thay vao phuong trinh (1) va bien ddi ta cd: ^ S = e""^"*^ V "^"^^ t" '^'''' - 088 V "^"^^.t" "^''' * Danh gia tin cay cua ham hdi quy thwc nghiem: - Md hinh toan hpc: [7] ^i Ta cd dp tin cay ciia ham phi tuyen:'" = ——^— 7Z.v->,r Trong dd: ''•>"=^TX'' n: Sd thi nghiem; Gia tri ciia cac thi nghiem; Gia tri ham hdi quy thuc nghiem, Gia tri trung binh cua cac thi nghiem Suy ra: i -yy- Ap dung danh gia dp tm cay eua phuong trinh tren ta ed bang sd lieu tinh toan nhu bang 3.3 Bdng 3.3: Gid tri tinh todn cua cdc biin hdi quy thuc nghiem t TT X, X, 1 -1 0.01 0.619 +1 -1 0.01 0.708 •1 +1 0.03 +1 +1 0 0 V,(m/ph) T (T-T)' (T-T,)' 0.6168 0.016727 4.8IE-06 0.7133 0.001627 2.82E-05 0.751 0.7570 7.11E-06 3.58E-05 0.03 0.876 0.8754 0.016299 3.49E-07 0.02 0.781 0.7642 0.001067 0.000283 0.02 0.755 0.7642 4.44E-05 8.4E-05 0.035771 0.000436 (mm/htk) Tong 4.490 Trung binh 0.748 TAP CHi CO KHi VIET NAM, S6 nam 2014 www.cokhivietnam.vn T, NGHIEN cuu-TRAO DOI Thay gia tri tinh toan bang (3.3) vao phuang trinh ta co: mai, ta thay eac ham quan he dang ham sd mil nhu du doan vdi dp tin eay cao Che dp cat (V |^,t) ed quan he ti le thuan vdi chieu cao nhap 0.035771-0.000436 „ „„ r = = 0.98 nhd trung binh be mat da mai (S^); dd, 0.035771 chieu sau cat (t) cd anh hudng nhieu ban tde dp -D6thihmh3.1 phdi (V 1^) Cae ket qua thi nghiem bang 3.1 cho thay, giai doan dau da mdn nhanh (tai thdi diem mai phut, chieu eao nhap nhd trung binh be mat da mai tang), nguyen nhan la sau sira da cac hat mai (ludi cat) phan bd ngau nhien tren be mat da, tien hanh mai (thdi diem mai phut dau) mpt sd hat mai d vi tri khdng thuan Ipi hi bong trdc khdi be mat da dan den lam tang chieu cao nhap nhd trung binh be mat da (S^) Giai doan mai tiep theo, da mdn dn dinh (thdi diem mai phut, 10 phiit chieu cao nhap nhd trung binh be mat da mai giam) Dae biet, chieu cao nhdp nhd trung binh be mat dd mdi d mdt sd cap che dp cat ta thay chieu eao nhap WA60.150x13x31,75 (SJ tgi thai diim mdi phut nhd trung binh be mat da cd xu hudng tang tai eae thdi diem mai 15 phiit hoac 20 phiit, nguyen * Tu-OTig tu* ta xac dinh phirtmg trinh S^tai nhan la giai doan ap lue mai cang tang, sd lugng hat mai bi bde tach khdi be mat thM diem mai phut den 30 phut nhy sau: da cang nhieu dd nhieu hat mai mdi nhd len - Thai diSm mai phut: S^= e-»»='«.V^^»"" tren be mat da mai tao cae ludi eat mdi, lam t» '