T^P CHi KHOA HQC & C6NG NGHp CAC TRl/dNG D^l HQC K* THUAT S6 91 -2012 NGHIEN ctru ANH HirdNC CUA ufc CAT DEN BQ CHINH XAC GIA C N G T R £ N MAY TlfN MAXXTURN65 RESEARCH THE INFLUENCE OF CUTTING FORCE TO MACHINING ACCURACY ON TURNING MACHINE MAXXTURN65 Li Hieu Giang, Huynh Bd Song Todn Dai hgc Su Phgm Ky Thugt TPHCM Din T6a soan 27-7-20 i 2, chip nh9n dang 21 -9-2012 T6IVI TAT Trdn thi gi&i dd c6 nhiiu cdng trinh nghidn ciru vi li/c cdt Tuy nhidn nghidn cuv vi dnh hu>img cua lgc cdt din dd chlnh xdc gia cdng timg truing hgp cy thS vin cin thiit di tii uv hda chi ^ ) + P,(t^) + P,(s^) T^P CHi KHOA HQC & C N G NGHf CAC TRl/dNG D*I HQC KV T H U A T * S 91 - 2012 Pz=7o+Y,(n) + Yi(t) + Y3(s) + Y^Cnt) + Ys(ns) + ,^^ y,(ts) + 7,(n^)+YB(t')+Y9(s') Trong d6 cdc he s6 a, p , y sS phu thugc vao v§t lieu lam dao, vat lieu gia c6ng, g6c dp dao Dan vj luc Id N Phuang trinh bSc a tren thfi hifn dnh huong cua su tuong tdc giija cdc thdng so ch£ cat din luc cat qua tich nt, ns vd st l/inh Kit LJIUI 16 mau ihi ivjjuim Nghien cim chi xdc dinh sir tuang tdc ciia ba th6ng s6 vung khao sdt: n=^300-^900 vg/ph, s=0,12-K),24 mm/ph, 1=0,4-^1,6 mm va xem nhu thong s6 ciia dao la khong d6i qud trinh thi nghiem THi N G H I f M (8] Tiln hdnh thi nghiem tr€n mdy tifen Maxxtum65 Dung cu cat got Id miing Insert hang ATORN (CCMT 09T302 - PY HC66I0) Vat lifu gia cong th^p C45 Phoi hinh tru tr6n 045mm, ddi 50mm, gd kep 20 mm, khong dung dung dich lam ngupl Hinh Ket qud ihi nghiem lap ldn X C LY KET QUA Thiet bi thi nghiem la bo dung cu TelC, phan m i m mo phong XKM Chi do chinh xdc kich thu6c duong kinh chi tifit Moi tnrong thi nghiem: nhiet phong 25-30 °C Ldn luat tien hanh 16 thi nghiem theo bang b6 tri thi nghiem Taguchi [2,7] Sau d6 ti€n hanh them thi nghiem, m6i thi nghiem lap lai ldn voi bang bo tri khac de lay s6 lieu ve kich thudc Phan tich cdc thong so dnh huang den lire Px nhu sau: Bdng Tong hgp cdc thdnh phdn dnh hu&ng den lite Px n t s nt ns ts nn tt SS 558.763 -0.31832 0.3238 -75.4088 443.1813 0.9018 149.1085 1214.8 0.2472 225.0003 0.2379 0.3933 501.606 -1.2392 0.2785 -29.5955 2207.6 0.9466 471.5992 -0.00025 0.3126 111.6471 213.4379 0.8824 254.3752 3296.432 0.2426 Theo nhu Bdng ta thay he so tuang quan R ciia ts (0.9466) Id 16n nhdt, nhu vdy ts CO anh huang nhieu nhat den luc Px (Hinh 5) T i l p theo Id he s6 R ciia t (0.9018), t co anh huang ldn thir hai den Px Hinh Dung cu lire cdt trin MaxxTurn m s6 R cua ss(0.2426) vd s(0.2472) nho nhat nSn ss va s co dnh huang thap nhat TAP CHI KHOA HQC & CONG NGHf CAC TRITONG DAI HQC Kt" THU^T • S6 91 -2012 Hinh Bieu quan h^ giua Px, tvds Phdn tich tuang tvr d6i vdi lgc Py ta c6: Bdng Tong hop cdc thdnh phdn dnh hir&ng den lire Py n t s nt ns ts nn tt ss 199.5275 -0.13539 0.4996 209.9088 -91.6138 0.6762 Hinh Bieu quan he giira Pz, tvds Phdn tich tuang tir doi vdi lire Pz ta c6: Bdng Tong hop cdc thdnh phdn dnh hir&ng den lire Pz •C^^^B^^^^^^^^^^B n 695.0506 -0.26779 0.2593 91.8625 442.5119 0.8571 136.7173 2209.206 0.4279 393.0594 0.235525 0.3706 20.582 542.85 0.4007 210.2792 -0.15331 0.9193 t s nt 131.623 -0.12341 0.1006 DS 595.1097 -0.56236 0.1203 155.8552 -208.668 0.3245 99.35284 2416.786 0.9863 161.6909 -0.00011 0.4739 172.312 -45.0142 0.6751 68.15795 1457.472 0.3892 ts nn tt ss 621.4278 -0.00021 0.2494 280.8871 211.2394 0.8313 326.4192 6045.207 0.4236 Tir Bang co he so tuong quan R cua nt (0.9193^ Id Ion nhat nen nt co anh hudng ldn nhdt din Py (Hinh 6) He so tuong quan R cua ts (0.9863) la ldn nhdt nen ts co anh huong nhi^u nhit d6n Pz(Hinh7) He s6 R ciia t (0.6762) ldn thir hai nen t CO dnh hudng ldn thu hai din Py Tuy nhien, so vdi muc anh hudng cua t din Px thi nho han He s6 R ciia ns(0.1006) nhd nhdt, tilp theo Id ts(0,3245) n6n ns va ts It co anh hudng den Py nhat Tilp din la he s6 R ciia 1(0.8571) nen t c(3 anh huong Ion thii hai dgn Phuong trinh h6i quy da biln cho luc Px, Py va Pz nhu sau: Hinh Bieu quan he giira Py, nval Px= -285.62-O.lX, + 673.94X2-11951.55X, - 0.42X,Xj - O.eX.Xj +521.46XiX, + 0.0003Xi'-41.34X2M602.34X,' (1) R'= 0.9981 Py = - 197.5 -I- 0.02X, + 168.32X2 + 3588.68X3-0.15X1X2-1.81X1X3-9O8.88X2X, + 0.0002X,^ - 20.24X2' - 3650X3' (2) R'= 0.9827 Pz = - 198.72-0.23X, -1-560.49X2-1- 2314.09X3 -0.19X,X2-0.57X,X,+ 1052.31X2X3-10.0003X,'- 101.78Xj'-3216.8Xj' (3) He s6 R ciia ns(0.1203) va nn(0.2494) nho nhdt nen anh huong it nhdt din Pz TAP CHi KHOA HQC & C6NG NGHf CAC TRt/dNG DAI HQC KV THUAT • SO 91 - 2012 R' = 0.9983 Trong X| Id n, Xj la t va Xj Id s Binh phucmg h$ so tuang quan cua phuang trinh Pz la l&n nhdt 0.9983 tiep theo Id R^ ciia Px la 0.9981 vd nho nhdt la cita Py 0.9827 Cd ba phucmg irinh deu ddng tin cgy Dudi day la cac bang phan tich cdc thdnh ph^n lire cat vd phuang sai: Ta ed phuang trinh hdi quy tuyen tinh ciia phuang sai kich thudc so vdi cdc thdnh phan cua lire cat la: = I0-^*(1127 - 5.2PX- 2Py + 2.4Pz) He sd R^ = 0,83 cd nghia Id phuang trinh hdi quy tuyen tinh gidi thich 83% cdc khdc biet ve dp chinh xdc ddi vdi luc cat Bdng He sd ttrang quan giua lire Fx vd phuang sai Regression Statistics Multiple R 0.879978815 R Square 0.774362715 Adjusted R Square 0.742128817 Standard Error 0.000122616 Observadons (4) R^ = 0.83 Bieu phuang sai va cdc thdnh phan 600 I - -L- Bdng He so tucmg quan giira lire Py va phucmg sai Regression Statistics Multiple R 0.0877546 R Square 0.00770087 Adjusted R Square -0.134056149 Standard Error 0.000257135 Observations Bdng He sd lucmg guan giira lire Px vd phuong sai Recession Stallstlcs Muhiple R 0.822824238 R Square 0.677039726 Adjusted R Square 0.630902544 Standard Error 0.000146695 Observations De nhan thay he so tuang quan cua ba luc vdi phuang sai kich thirdc dgu khac vd cd ddu ducmg, nen co mdi lien he tuyen tinh giu'a ba luc vd phuang sai kich thudc He sd tucmg quan cua I*x co gia tri ldn nhit Id 0.879978815 nen lire Px cd dnh hudng ldn nhat Hf so tuang quan ciia Pz ldn thir hai Id 0.822824238 n6n Pz cd dnh hudng ldn thir hai Con he sd tucmg quan ciia Py cd gid tri nhd nhdt 0.0877546 (nhd hon he sd ciia Px 10 ldn) Hmh Bieu col phtrong sai vd Px, Py, Pz Hinh cho thdy rang phuang sai nho di hay dp chinh xdc gia cong co xu hudng tang Px vd Pz cimg cd xu hudng tang, Gia tri Py khdng anh hudng nhieu d^n phuong sai kich thudc hay dp chinh xac gia cong Do chinh xac gia cdng cd xu hudng giam tiic phuang sai tang Px va Pz ciing giam di KET LUAN Bai bdo da trinh bay qud trinh nghien ciru dnh hudng cdc thong sd cong nghe den cdc thdnh phan ciia luc cat va anh hudng ciia luc cat den phuang sai kich thudc hay dp chinh xac gia cdng tren mdy tien MAXXTURN65 Trong bdi bdo nay, cac phuang trinh thuc nghiem lien quan den cdc phan ciia lire cat vd cdc thdng sd cdng nghe da duac xac dinh theo cdng thirc (1), (2), va (3), Do cd ba phuang trinh c6 he sd tuang quan cao nen ket qud la ddng tin cay Tir kit q^ua thuc nghiem, phuang trinh thuc nghiem the hien su dnh hudng ciia luc cdt TAP CHi KHOA HQC & C6NG NGHf CAC TRl/dNG DAI HQC KS! THUAT * S6 91 -2012 din phuang sai kich thudc hay dp chlnh xdc gia cdng cung da dupc xdc djnh theo phuong trinh (4) nhdt din d^ chinh xdc gia cdng Khi hai thoi^ sd Px vd Pz ciing tdng pham vi khdo sdt thi chlnh xdc gia cdng tang len Bilu d6 Hinh cho ta th4y Py khdng dnh hudng nhilu din dO chlnh xdc gia cdng bdng Px vd Pz; dd biln t vd vd Is cd dnh hudng ldn nhat din Px vd Pz, c6 nghTa Id dnli hudng Idn Kit qud ndy cd thi dupc sir dung dl tinh todn cdc thdnh phdn cua lgc cdt vd dir bdo chinh xdc gia cdng chpn trudc chl dd gia cdng tren mdy tien MAXXTURN65 TAI LIEU THAM KHAO L Shaw, M., Metal Cutting Principles, Oxford University Press, Oxford, United Kingdom, 1989 ^ Davim, J P., "Study of drilling metal-matrix composites based on the Taguchi techniques", J Materials Processing Technology, Vol 132, p 250-254, 2003 Noordin, M.Y et al., "Application of response surface methodology in describing the performance of coated carbide tools when turning AISI 1045 steel", J Materials Processing Technology, Vol 145, p 46-58, 2004 Polini, W and Prisco, U., "The estimation of the diameter error in bar turning: a comparison among three cutting force models" Int J Advanced Manufacturing Technolo^, VoJ 22, pp 465474, 2003 Luo, T et al., "A neural network approach for force and contour error control in multidimensional end milling operations", Int J Machine Tools and Manufacture, Vol 38, pp 13431359, 1998 Suresh, P V S , Rao, P.V and Deshmukh, S G., "A genetic algorithm approach for optimisation of surface roughness prediction model", Int, J Machine Tools and Manufacture, Vol 42, pp 675-680, 2002 Ross, P., Taguchi Techniques for Quality Engineering, McGraw-Hill, New York, 1988 Huynh Dd Song Toan, Luan vdn thac sT: "Nghien cuu dnh hudng cua luc cat din dp chinh xdc gia cdng tren mdy tien Maxxtum65", DHSPKT-TPHCM, 2012 Dia chi lien he- Le Hieu Giang - Tel: 0938308141, email: gianglh@hcmute.edu.vn Khoa Co khi, Trudng Dai hpc Su pham Ky thuat phd Hd Chi Minh ... chinh xdc gia cong co xu hudng tang Px vd Pz cimg cd xu hudng tang, Gia tri Py khdng anh hudng nhieu d^n phuong sai kich thudc hay dp chinh xac gia cong Do chinh xac gia cdng cd xu hudng giam tiic... thudc hay dp chlnh xdc gia cdng cung da dupc xdc djnh theo phuong trinh (4) nhdt din d^ chinh xdc gia cdng Khi hai thoi^ sd Px vd Pz ciing tdng pham vi khdo sdt thi chlnh xdc gia cdng tang len Bilu... sir dung dl tinh todn cdc thdnh phdn cua lgc cdt vd dir bdo chinh xdc gia cdng chpn trudc chl dd gia cdng tren mdy tien MAXXTURN65 TAI LIEU THAM KHAO L Shaw, M., Metal Cutting Principles, Oxford