NGHIEN CCfU-TRAO D O I NGHIEN Ciru ANH HU'DNG HJNH HOC DUNG CU CAT PCBN KHI TIEN CLTNG THEP 2311 QUA TOI DlN DO NHAM B^ MAT \\ RESEARCH O N EFFECT O F PCBN GEOMETRY INSERT O N T H E SURFACE ROUGHNESS IN RIGID T U R N I N G C N C FOR 2311 STEEL ALLOY AFTER »• HARDENING KS Hoang Bi Khoa', ThS Dmh Hiiu Cuong', TS Lai Anh Tuin' 'Trutog Cao dtog Giao thing Vfa tai III 'Trung tim Ky thuit Tilu chuto Do lutog chit lUpng Ding Nai 'Hpc vita Ky thuit Quto sfl TOM TAT Bdi bdo trinh bdy kit qud nghiin cdu dnh hUdng cda hinh hoc dung cu cdt PCBN din dd nhdm bi m^t tiln dng thip hdp kim 2311 qua tdi tren mdy CNC Cdc thdng sSdnh hudng din dd nhim bi mat dUdc nghien cdu bdi bdo Id gdc nghieng chinh ciia dao, gdc cat trUdc ciia dao, bdn klnli mm dao Cdc tdc gid dd sit dung phUdng phdp quy hoach thiic nghiim trUcgiao cdp detim phUdng trinh cho quan hi cda thdng so trin vdi dd nhdm be mat, cung nhU dimg phdn mim Matlab di tim m: cue tri tdi Uu cho dd nhdm be mat Kit qud nghiin ciiu Id cdc thi dnh hudng cua cdc thdng si hinh hgc cua dung cdt den nhdm bi mat chi tiit gia cdng Tfl khoi: PCBN: Matlab: Thip 2311; CNC; Tiin cilng ABSTRACT This paper presents results ofresearch on effect of PCBN geometry insert on the surface roughness m ngid turning CNC for 2311 steel alloy after hardening Plane approach angle, rake angle, tod nose radial are considered which are parameters influence on surfa ce roughness Equations describe the relationship between parameters with surface roughness are determined base on using planning 7ZgZ::^:Z!r''''"'^''"'"'''"^^^^^^ Keywords: PCBN; Matlab; Steell 2311; CNC; Rigid Turning ISSN 0866-7056 TAP CHI CO KHI VlfiT NAM, Si nam 2016 www.cokhivietnam.vn NGHIEN CCfU-TRAO D O I I.DATVXNDE Viec gia cing cic chi Uet dang true co dp ctog cao vi ylu ciu phii dat dp nhim bi mat cip trd lln, ddi hoi nhieu cing doan gia cing phflc t«p khic Theo phuong phap truyfo thong la mii thi dto tdi nhieu vto de bat lpi sto xuat Mii chi tiet doi hoi trang bi c i i ^ nghe phflc tap, giy o nhilm moi trudng va kho cd the tai che lai h^t mii Vi viy, Ufo cflng li phUflng phip thay thl vi ngiy ctog trd nta quan trong sto xuit vdi nhflng flu the cia nd Tita ctog cd thdi gian gia cing nhanh qui trhih gia cing Imh hoat chi phi dau tu thip giim giy i nhilm moi trUdng tuii tho lim vile cia chi tiet cao [3] Trong tita ctog dung Ifldi cit don nta co the dieu chinh chinh xic gdc cat de dtog gia cong cic be mat phiic t?p cua sto phtoi Viy vfa dl dat la chpn pi^ thing si da nghiin cflu trudc diy va nghiin cflu thim cic goc cat tita cflng de nhim tii flu hda quy trinh cong nghe Vit hiu sieu ctog dupc dtog de che tap cac loai dao tita bang Nitrit Bo dupc dtog de gia cdng mat ngoii, mat dau, mat 16 Cac thing s i hinh hpc cua dap tita btog Nitrit Bo ctog phy thupc vio tinh chat vit hta cua chi tiit Khi gia cong thep nhiet luyfo: y = -^ (-15") gdc nghieng chmh 0.15 mm/vong thi bien d ^ g dto hii se toh hudng den sU hmh cac nhap nho te vi, ding thdi ket hpp vdi fah hutog cua cac yeu t i hinh hpc Iam ttog nham be mat [2] THIET KE THU'C NGHI$M Viy, mifo thUc nghiim chpn li bto kinh mui dan tfl 0.4mm den 1.2mm, gdc nghiing chinh 9, = 30"+60°, gdc cat trUdc im y = g'+lS" 2.1 Chpn phuong in thi nghiem Bai bao nghiin cflu anh hudng cua gdc nghitog chmh, gdccattrfldcvabto kinh miii dao - Thi nghiem dupc gia cing tren miy din nhim bi mat nen phfltog phip nghita CNC CTX310 (Mnh 2.), sfl dung mtoh dao cflu dflpc chon la phfltog phip qui hojch thfle PCBN CNGA1204 Idp phu KB5625 (65% him nghiim trflc giao cip Cic yta t i khic la co lupng CBN) Cto dao sfl dung thi nghi|m dinh MCMNN2020K12 dn Ihi nghiim Htnh Mdy vd cdc thiit bi thl nghiim ISSN 0866-7056 TAPCHlCOKHlVIET NAM, S67nam2016 www.cokhivietnam.vn NGHIEN CO'U-TRAOeOl - Phoi thi nghiem la thep 2311 nhi?t V6ik=3; a^ = 1.476; a = 1.215 iuyen c6 dp ci5ng 52HRC, chieu dii phoi 120mm De dat dii(?c cac gdc cat dap iing mifei va du6ng kinh 60mm thiic nghiem da thiet ke, chl tao cac chi tiet nfim Cac chi tiet n^y diidc ga chung vdi can dao tien - Van t6c cat: V = 160m/phut; tren dai dao va dieu chinh bang may cho mui - Chieu sau cat: t = 0.2mm; dao nam tai vi tri m?t phang tam tryc (hinh 3) - Li(dngchaydao:s-0.1nmi/v6ng Cac y^u t6 tr^n luon on djnh qud trinh thiic nghifim Dang cua phiiong trinh h6i qui nhii sau: y=b, - b,ii - lijij+hrt - h^«,i;-^ buJ,!,+baijij+bu^-Miai^+boi^'(1) Hmh Phuang dngd dao thdc te thi nghiim Cac y^u t6 anh hiidng nhii sau: % 2.2 Ket q u i thUc n g h i e m Xji Goc nghieng chinh dung cijc5tq)| (dp); x^: Ban kinh miii dao dung cu cdt R (mm); Bdng Kit qud dd nhdm bi mat theo bdng qui hoqc thuc nghiem Xji G6c trUdc dung cy cdt y (do) Gid tli X «i Klioiiiig bib 40" S X, S 60» 0.4 S X; £ 1.2 9* fix, SIS" thian 50" 0.8 11« IO" 0.4 2' < ^' Bi ti?n tinh toan cac he s6 thyc nghi?m cOa mo hinh toan h6i quy vk tien hanh cac bii6c xi£ ly s6 Mill, ta chuyen sang ma hoa gia tri khong thli nguyen vdi gia tri can tren (+1), gia tri can dudi (-1) v4 gia tri trung bmh x_''=0 Tmng khoir^ kh6ng gian md rOng a = 1215 % ^ = l - : x ; _ = 62.2^ x ^ ^ = 1.28mm; x^„^ =13.4" 3- = _.1.215; x' = 0.32min; xL„ =37.8" III Bdngl Gid tri vd khodng biin thiin cua cac yeu td dnh hudng Biln m a STT \ + + + + + -t- Xj ^ - "^ 0.8 + 0.91 -t- -t- Y(m) 0.62; + -t- 1.02 -t- 0.9 -t- 1.03 + + -t- 0.62 -t- + + -t- 0.65 -^ 1.215 0 0.67^ -1.215 0 0.51 10 + 11 + 1.215 0.9 12 -t- -1.215 1.12 13 + 0 1.215 0.57 14 -t- 0 -1.215 0.52 15 -t- 0 0.71 = 8.6° 2^=0.77 1t t ISSN 0866-7056 TAP CHl CO KHf VI$T NAM S6 nam m i 2016 2016 www.cokhivietnam.vn k NGHIEN CO'U-TRAO Dt!)! Bang Kit qua nhdm he mat tm tdm phUdng dn STN «i *J 50° 0.8mm "a 11° 50» O.Smm 11° 0.64 S0» 0.8mm 11° 0.67 50° O.Smm 11° 0.70 0.675 Gia tli tnmg binh y yi(i"») ^ = :Ta^ (4) 0.69 Sau CO ket qui thi nghiem tai cic vi tri cua phUOng an qui hoach thiJc nghiem trUc giao cip ta se Uen hinh tim phuong trinh hoi qui(l) X i r i t KET QUA VA D A N H G I A 3.1 Xill ly kft q u i thdc nghiim Bdng4 Kit qud cdc hi s6 trongphUdng trinh (3) tinhtiieocdng th^c (4) K bl b bs b,^ 0.7700 0.0789 -0.0911 -0.0081 0.0238 bi3 b„ bi, b; bia -0.0438 -0.0738 -0.0321 0.2523 -0.0625 Cong thfle tinh dp lech chuan cfla he so b phflOng trmh (3) Vi ma trin thfle nghiem cap II sau d6i bi&i li ma tran trflc giao nen moi he s6 b phflong trinh (4) dpc IJp va xic dinh vdi dO chmh xic dupc tmh theo cong thfle sau: Phuong sai tai hien idoc tinh theo m=4 lin lap ciia thi nghiem tam: s = ^ I S , C y , - y ) ' = 0.0007 (2) S ^ = 0.026 \ = ^ = Sau bien doi m(5i (1) phuong trinh h6i qui co dang: y=b;tlift-b.i.-b,i,-brti.+ii|rti,+iyo,,ib;i;t^^+l4,; (3) 0-0094 Sb„=•1 - i»-?) +:(•"'-?j"+(2k-2+n.)(;s') Sj, = 0.0127 Vi sau doi bien ma tran d bing qui Kiem tra y nghia cua cac hi s6 h o ^ thfle i ^ l m trflc giao nen cic he so PTHQ: phflong trinh (3) doc IJp vi xac dinh theo c6ng thfle sau diy (5) bi = ;I2f=iyoXo» So sanh t^ v i t|,(p.f) de tim h« s6 c6 ".^t^ b.= ^n'ni^iu !:!!«(xi.^f je{1.23};u=1.2.3 Trong do: So mflc dp tfl f=n||-l (n,: So lan thi nghidm d tim) f+4-l=3 p=0.95: Xac suit tin ciy: Tra bing t^(pfl = tj(0.95.3) ISSN 6 - TAP CHl CO KHl VI$T NAM s a nam 2016 www.cokliivietnam.vn NGHIEN CCrU-TRAO D6I 4.KETLUAN Vdi ket qua nghien cflu tren thi ro rang cac yiu to nhil gdc cat tnidc, gdc n ^ e n g chinhii hiidng nhieu den nham hi m^t Qua ngliien cdu da xac dinh diidc cac thong so hinh hoc c4a dung cu (At di cho k^t qua toi liu la nham b^ mat gia cdng nho nhat Vdi khS nang cat kho cfla PCBN cd the cat thep sau nhiet luyen tdi cijtng 68HRC thi ro r ^ g la nhiing l^i ich ma cdng ngh? mang 1^ cho chung ta sii liia chpn hoan hao hon so vdi cac phiidng phap ti&i tinh thong th\iisas khac.*;* Ngay nhan bai: 12/5/2016 Ngay phSn bien: 22/6/2016 TM li^u tham khao: [ ] TrSxi Van Dich (2004); Gia cdng tinh be m^t chi tiit mdy NXB Khoa hpc va Ky thu^t, Ha NOi [2] Trln W n Dich, Nguyen Trpng Binh Nguyen The Dat, Nguyin Viet Tiep, Trln Xuan Vi^t (2009); Cdng Mgftg chi tao mdy, NXB Khoa hpc va Ky thuat, Hk N6i [3] Viktoria Bana (2006), "Manufacturing of high preciseion bores" Doctoral thesis 2006, Delft Universityof Technology, Holand 107 [4] M Dogra,V S Sharma, J Dureja (2011), 'E^ct of tool geometry variation on finish turning" Jouma|if Engineering Science and Technology Review 4(1) (2011) 1-13 (5] Chen W (2000); "Cutting forces and surface finish when machining medium hardness steel using CBN tools", Intemational Journal of Machine Tools & Manufacture, 40, pp 455-466 ISSN 0866-7056 TAP CHI CO KHl VIET NAM, S6 nam 2016 www.cokIiivietnam.vii ... CBN vdi bto kinh mui dao tieu chufa khic (0.4, 0.8 vi 1.2 mm) dupc sfl dung vi ket qua cho thay sU gia ttog bfa kinh mui dao dto den su ttog lUc day dtog ki [4] Khi gia cing vdi lupng chsy dao 0.02... dung mtoh dao cflu dflpc chon la phfltog phip qui hojch thfle PCBN CNGA1204 Idp phu KB5625 (65% him nghiim trflc giao cip Cic yta t i khic la co lupng CBN) Cto dao sfl dung thi nghi|m dinh MCMNN2020K12... bi thl nghiim ISSN 0866-7056 TAPCHlCOKHlVIET NAM, S67nam2016 www.cokhivietnam.vn NGHIEN CO''U-TRAOeOl - Phoi thi nghiem la thep 2311 nhi?t V6ik=3; a^ = 1.476; a = 1.215 iuyen c6 dp ci5ng 52HRC,