NGHIEN Cl/U-TRAO DQ NGHIEN CU'U A N H HU'dNG CUA QU? OAO CHUY&N OONG DAO OEN NHAM BE MAT CHI TliT GIA CONG TREN TRUNG TAM CNC RESEARCH AFFECTING THE TRANSFERRING FACILITY OF THE TOOL TO THE SURFACE DETAILS OF THE CNC CENTER TS Nguyen Van Thign', ThS Le Hoai Son^ 'Trudng Dai hpc Cdng nghidp Ha Ngi ^Trudng Cao ddng nghe Co dien Ha Ndi TOM TAT Bdi bdo ndy trinh bdy nghien cuu dnh huang cua quy dgo chuyen dpng dao phay ngon den nhdm be mat chi tiet phay tren trung tdm gia cdng CNC Noi dung cua bdi bdo trinh bdy phuang phdp nghien ciru bdng thyc nghiem vd xu ly so lieu de dua moi quan he giira che dp cdt vai nhdm be mat chi tiet tgi cdc dgng quy dgo chuyen dpng cda dung cu cdt Tic ldm ca sa cho viec nghien ciru ve dnh hu&ng cua phuang phdp gia cong den nhdm be mpt chi tiet gia cong tren trung tdm CNC Tvt khoa: Quy dgo chuyen dong, che dp cdt, nhdm be mgt ABSTRACT This paper investigates the effect ofthe End mill to the surface ofthe milling surface on the CNC machining center The content ofthe paper presents experimental methods and data processing to show the relationship between cutting mode and surface roughness in the trajectory ofthe cutting tool As a basis for the study ofthe influence of machining methods on the surface of machined parts on CNC centers Keywords: Motion trajectory, cutting mode, surface roughness DAT VAN DE Chdt Iugng bl mat ciia chi tilt gia cdng khdng chi phu thugc vao tinh chdt co ly ciia vat lieu ma cdn phu thudc vao trang thai cua Idp bl mat, cac chi tiet dugc che tao tir mot B loai vat lieu nhu nhau, nhung theo cac phuong phap khac se tao Idp be m$t khac [4] D l danh gia chdt lupng hinh hgc be mat chi tilt gia cdng thi dp nham bl mat la mot nhung tieu chi quan trpng Anh hudng cua chl cdt hoac luc cdt sinh ttong qua ISSN 0866 - 7056 TAP CHi CO KHI VIET NAM, Sd nam 2017 www.cokhivietnam.vn NGHIEN CLKU-TRAO l trinh gia cdng la mdt cac nguyen nhan chinh gay nham bl mat [3] Ngoai ra, quy dao chuyen dgng ciia dao cung la mgt nguyen nhan anh huong din nham b l m^t chi tilt Ngay nay, cac san pham nganh Ca rat da dang ve hinh dang hinh hpc ciing nhu bien dang khac nhu: Mat phang, mat trdn xoay, mat ndn, be mat c6 hinh dang hinh hpc phiic tap De nang cao chat lupng bl mat chl tiet ta phai quan tam vao nhilu yeu td qua trinh gia cdng chi tilt: Thilt bi, dung cu, chg dp cong nghe Gia cdng tren may dieu khien sd CNC dang dugc quan tam nhilu Sir dung may dieu khien sd CNC cho phep tang nang suat, nang cao dp chinh xac gia cdng va hi^u qua kinh te Hien nay, nudc ta va cac nudc tren the gidi dang ung dung rgng rai may dieu khien sd vao ITnh vuc co chl tao de che tao cac chi tiet ca khi, dac biet la cdc chi tiet yeu cau dp chinh xac cao va dam bao dugc chat lugng bl mat Xuat phat tu nhung nhu cau thuc te viec "Nghien ciiu anh hudng quy dao chuyin dgng cua dao den nham be mat chi tiet gia cdng tren trung tam gia cdng CNC" Ik can thiSt Hinh 2.1: Mdy phay CNC DMC 835V * Thiet bi nham: May SURFTEST SJ-210 hang Mitutoyo cd cac thdng sd ca ban sau: Hien thi LCD, tieu chudn DIN, ISO, JIS, ANSI Thdng sd dugc: Ra, Rz, Rt, Rq, Ry Dp phan gian: 0.02/360^im; 0.006/100^; 0.002/25^m Bd chuyin ddi A/D: RS - 232 C Phdn mim dilu khien va xu ly sd lieu MSTAT w 324.0 TRANG THIET BI VA PHlTONG PHAP TIEN HANH THI NGHIEM 2.1 Trang thilt bi thi nghiem Hinh 2.2: Thiet bi dg nhdm * Mdy thtfc nghiem - Sli d\mg may phay CNC DMC 835V Diic san xudt cd thdng sd ky thuat: He dieu khiln SIEMENS; Tdc dp ldn nhdt cua may 10000 Vdng/phut True XxYxZ: 850x550x550, 30 dao thay tu ddng * Phdi thac nghiem: Vat lieu: Thep C45 Kich thudc phoi: 60x40x30 mm 2.2 Phirtfng phap tien hanh thi nghiem * Cac budc thyc nghiSm: Vdi mdi kieu chay dao: High Speed, Zigzag, Morph Spiral ta thuc hien thi nghiem vdi V, S thay ddi ^ ISSN 0866 - 7056 TAP CHi CO KHi VlfiT NAM, Sd nam 2017 www.coldiivietnam.vn NGHIEN CU'U-TRAO D | Budc 1: Thiet ke bien dang chi tiet Budc 2: Thuc nghiem theo cac quy dao chuyen ddng ciia dao nhu sau: Zigzag, High Speed, Morph Spiral • • iH'• • r i Hinh 2.3: Quy dgo chgy dao kieu Pocket De ap dung phuang phap quy hoach thirc nghiem true giao, ta bien ddi phuong trinh ve dang da thiic bac nhat nhieu biln Do vay, ta su dung phucmg phap logarit hda hai ve, dugc phuang trinh nhu sau: Ln(R^) = Ln(Cp) + a.Ln(V) + bLn(S) Dat: y=Ln(RJ; a^ = Ln(C ); a, = a; a, = b; X, = Ln(V); x', - Ln(S) Budc 3: Xuat chuang trinh NC Ta dugc: y = a^ + a,Xj + a^x^ Budc 4: Tien hanh gia cdng tren may phay CNC DMC 835V Budc 5: Do nham be mat chi tiet Bang 3.2 Bdng logarit hoa cdc thong so dnh hu&ng t&i R^ M5U THlTC NGHIEM VA XU^ LY KET QUA THV*C NGHIEM Tien hanh thi nghiem vdi cac quy dgo chay dao: High Speed, Zigzag, Morph Spiral Cac thi nghiem dupc tien hanh vdi cac gia tri ghi cac bang: * Anh hu-dng cua V va S tdl nham b l mat Ra trircmg hop chay dao kilu High Speed Bang 3.1 Anh huang cUa VvdSl&i R^ Mau TN" V(v/ph) S(nim/ph) R>m) 3000 3000 1500 1500 500 300 500 300 0,43 0,62 0,63 0,65 - Dang phuang trinh quan he: R=Cp.V.S'' (3.2) TN" X, = InV Xj = InS y = lnR 8,006 8,006 7,313 7,313 6,214 5,704 6,214 5,704 -0,844 -0,478 -0,462 -0,431 Bang 3.3 Bdng ma trdn quy hogch ihuc nghiem choR MSu TN" Zj -1 -1 -H +1 ^2 -n -1 -n -1 Xj y ^2 8,006 6,214 -0,844 8,006 5,704 -0,478 7,313 6,214 -0,462 7,313 5,704 -0,431 Theo phuang phap quy hoach true giao, phuang trinh sau tim dugc se co dang: y = a' + b'.z + c'.z (3.3) Trong cac he sd a', b', c' dupc tuih theo cong thuc sau: (3.1) Trong do: C,a,b-ia cac hesd cdn xac dinh a'=^Zf.lyi=J[(-0,844)-^(-0,478)+ (-0,462)-)-(-0,431)] a' = -2,215 ISSN 0866 - 7056 TAP CHl CO KHl VlfiT NAM, S6 nam 2017 www.cokhivietnam.vn NGHIEN CU'U - TRAO D I R = 0,087.V»-'»'.S-°'"' V = ^ E " ZiiK = J (0,844 + 0,478 - 0,462 - 0,431) b" = 0,429 =' 'llti^uyi = J (-0,844 + 0,478 - 0,462 -f 0,431) c" = -0,397 (3.6) Dung phan mem Matlab de ve thi bieu dien mdi quan he cua dp nham be mat R^ vdi thdng sd che dp cat, hinh 3.1 - Phuong trinh hdi qi^ thuc n ^ e m cd dang: y = -2,215 + 0,429.z,-0,397.Z2 (3.4) Chuyen phuang trinh hdi quy thuc nghiem ve bien x^ va x^ theo cdng thuc ddi nhu sau: (3.5) fAx, Trong do: Xi - Gia tri trung binh cac gia tri cua x ; Ax - Khoang chenh lech gia tri cua x ; - Phuang trinh hdi quy chuyen ve bien X, va x, nhu sau: -2,215 + 0,429 x , ~ 7,659 0,346 0,255 y = - 2,434 + 0,109x, - 0,137.x^ -Ta cd cac he sd a, b, c nhu sau: Theo cdng thuc: hix = Cp ^ X =e^''va e = 2,7118 hiC = - 2,434 => C = 0,087 p ' p a = 0,109 b - -0,377 Hinh 3.1: Do thi 3D biiu diin quan he giira Vvd S l&i nhdm be mat Ra tru&ng hap chay dao kieu High Speed * Anh hirdng ciia V va S tdl nham be mat R, trirong hop chay dao kieu Zigzag Bang3.4 Anh huangcua VvdSt&iR^ Miu TN, V(v/ph) S(mm/ph) R>ni) 3000 3000 1500 1500 500 300 500 300 0,38 0,40 0,50 0,60 - Tu bang 3.4, ta cd phuang trinh the hien quan he giira dp nham be mat vdi van tdc va budc tien la: R =0,765.V''•"^S-''•^^ (3.7) - Dd thi bieu dien mdi quan he ciia nham be mat R^ vdi thdng sd che cat hinh 3.2 - Vay, phuang trinh the hien quan he giiia nham be mat vdi van tdc va budc tien la: ISSN 0866 - 7056 i CO KHi VIET NAM, Sd nam 2017 www.coldiivietnam.vn NGHIEN CLfU - TRAO D I * Anh hudng cua quy dao chay dao den nham be R^ Bdng 3.6: Anh hu&ng cua quy dgo chgy dao loi R Quy dao Thong so chay dao thiet ke Hinh 3.2: Do thi 3D biiu diin quan he giira V vd S t&i nhdm be mgt R^ truang hap chgy dao kiiu Zigzag * Anh htrdng cua V va S tdi nham b§ mat R^ trirdng hop chay dao Ideu Morph Spiral High Speed Zigzag Morph Spiral R>m) Ll L2 L3 L4 H 0.43 0.62 0.63 0.65 Z 0.38 S 0.83 0.71 0.56 0.62 0.4 0.5 0.6 Tu bang 3.6, ta co dugc thi bieu di8n mdi quan he nhu sau: Bdng 3.5 Anh hu&ng ctia VvdSt&iR^ M5U TN V(v/ph) S(mni/ph) Ra(fim) 3000 3000 1500 1500 500 300 500 300 0,83 0,71 0,56 0,62 - Tu bang 3.5, ta c6 phuong trinh the hien quan he giira dp nham be mat vdi van tdc va budc tien la: 0,872.V-«-'".S°-'" Hinh 3.4- Moi quan he giira quy dgo chay dao vdi nhdm be mdt img v&i thong so cong nghi L^ (3.8) - Dd thi bieu diln moi quan he cua dp nham be mat R^ vdi thdng sd che dp cat hinh 3.3 Hinh 3.5: Moi quan he giUa quy dgo chgy dao v&i nhdm be mat ung v&i ihong so cong nghi L^ Hinh 3.3: Do thi 3D bieu diin quan hi giira Vvd S t&i nhdm bi mat R^ truong hpp chgy dao kieu Morph Spiral ISSN 0866 - 7056 TAP CHf CO KHi VIET NAM, Sd nam 2017 www.coldiivietnam.vn NGHIEN CLfU-TRAO DOI Ngay nhan bai: 12/6/2017 Ngay phan bien: 19/6/2017 0.4 — Tai li€u tham Idiao: H Z [1] M Hinh 3.6: Moi quan he giua quy dgo chgy dao v&i nhdm bi mat img vai thong so cong nghe L^ Hmh 3.7: Moi quan he giira quy dgo chgy dao v&i nhdm be mat img v&i thong so cong nghe L^ KET LUAN Nghien cuu anh hudng cua quy dao chuyen dgng dung cu den nham be mat chi tiet gia cdng tren trung tam gia cdng CNC la can thiet Cac ket qua thu dugc bai bao cd y nghia ly luSn va thuc tiln viec nghien cuu, danh gia chat Iugng be mat cua chi tiet Dua vao cac bieu thuc quan he giira che dp cat vdi nham be mat chi tiet vdi cac dang quy dao chuyen dgng khac nhau, ta cd the nghien cuu dugc su thay ddi cua nham be mat chi tilt, tim chl gia cdng hpp ly cho tung trudng hgp, gdp phan lam tang kha nang cat gpt cua dao, keo dai tudi ben ctia dung cu Tu dd giup cho viec nghien cuu phuang phap dam bao chat lugng be mat va tang nang suat gia cdng tren may CNC.'J* Nguyen Thanh Binh va cac tac gia; Nghien cim su dnh hu&ng cua chi dp cat den nhdm bi mat gia cong SUS 304 trin trung ldm gia cong CNC TC.500, Tap chi Khoa hoc va Cong nghe, TrLrdng Dai hpc Cong nghiep HaNoi, s6 31-12/2015 [2] Pham Van Bong; A study of effects ofcutting condition on surface roughness in maching aluminium alloy A6061 on CNC milling machine Tap chi Khoa hpc Cong nghe cac truong Dai hpc ky thuat, so 22/5-2016 [3] Tran Van Dich (2003); Nghien cuu chinh xdc gia cong bdng thuc nghiem, NXB Khoa hpc va Ky thuat Ha Noi [4], Banh Tien Long, Tran The Liic, TrSn Sy Tiiy (2001); Nguyen ly gia cong vgt heu, NXB Khoa hpc va Ky thuat, Ha Npi [5] Nguyln Viet Tiep (1997); Nghiin cim tinh gia cong cua vdt liiu chi tgo mdy vd ung dung cua no, Tntdng Dai hpc Bach Khoa Ha Npi [6] E Paul Decanno, J.I Black, Ronal A Koser (1997), Materials and Processes in Manufacturing, Pretice - Hall Internatinal {!] John A Schey (2000); Introduction to Manufacturing Processes, New York London [8] R.A MAHDAVINEJAD and S SAEEDY; Investigation of the influential parameters of machining of AlSl 304 stainless steel School of Mechanical Engineering, College of Engineering, University of Tehran, North Kargar St., Tehran 11155 - 4563, Iran ISSN 0866 - 7056 TAP CHi CO KHf V I £ T NAM, Sd nam 2017 ... dp chinh xac cao va dam bao dugc chat lugng bl mat Xuat phat tu nhung nhu cau thuc te viec "Nghien ciiu anh hudng quy dao chuyin dgng cua dao den nham be mat chi tiet gia cdng tren trung tam gia. .. nham be mat chi tiet gia cdng tren trung tam gia cdng CNC la can thiet Cac ket qua thu dugc bai bao cd y nghia ly luSn va thuc tiln viec nghien cuu, danh gia chat Iugng be mat cua chi tiet Dua... trinh gia cdng chi tilt: Thilt bi, dung cu, chg dp cong nghe Gia cdng tren may dieu khien sd CNC dang dugc quan tam nhilu Sir dung may dieu khien sd CNC cho phep tang nang suat, nang cao dp chinh