NGHIEN ClJU-TRAO DOI J NGHIEN CO'U ANH HU'6'NG COACHe 0 TlfQI NGUOI TOI DO NHAM B^ MAT GIA CONG TRONG MAI L THEP 9XC QUA TOI A STUDY ON THE EFFECTS OF COOLANT REGIMES TO SURFACE ROUGHNESS IN INTERNAL GRINDING OF STEEL 9XC Banh Tien Long', Vu Ngoc VP, Le Xuan Hl(ng^ Ta Viet Ciidng* 'Tnicfng Dai hoc Bach Khoa Ha Ngi ^TrUdng Dai hpc Ky thuat Cong nghiep, Dai hoc Thai Nguyen •'TnfcJng Cao dang Kinh te - Ky thuat Vinh Phiic TOM TAT Bdi bdo trinh bdy mgt nghien ciiu thUc nghiem ve dnh hudngcua che tUdi nguoi tdi nhdm he mat gia cong mdi 16 nho thep 9XC qua toi Cdc thi nghiem dUdc thiet ke theo phUdng phdp be mat chi tieu dang hdn hdp tdm xoay Bdng viec dng dung phdn memMinitab 16, phUdng trinh hoi quy bieu diin moi quan he giUa nhdm be mat vdi lUu lUdng vd nong ddu boi trdn dd dUOc tim Them vdo do, che tiidi nguoi hop ly diing ddu Emulsion cdng dUdc de xudt TU khoa: Che tUdi nguoi, mdi 16, nhdm be mat ABSTRACT This paper presents an experimental study on ihe effects of coolant regimes to surface roughness when internal grinding of steel 9XC The experiments were designed by the response surface method with Central Composite Design By using Minitab 16 software, model regression relationship between the surface roughness with the flow rate and the concentration of coolant oil was found Also, the best coolant regimes for Oil Emulsion were proposed Keywords: Coolant regimes, internal grinding surface roughness ISSN 0866 - 7056 TAP CHi CO KHi VIET NAM, S6 nam 2016 www.cokhivietnam.vn '- NGHIEN C l i u -TRAOD6I va chi tift ldn, han cU vi khong gian bd tri diu vdi phun dung dich trdn ngupi, nen vdi phun khd ti^p cin vflng gia cdng nen chit lupng bS Mii noi chung vi mii 16 noi rieng, l i mit chi tie't gia cdng thudng chUa cao phUPng phdp gia cong tinh vi ban tinh dupc sfl dung rpng rai gia cong co Sd di nbu Bii bio n i y trinh biy ket qua nghien cflu vay l i VI mai cho dp chinh xic gia cong cao, dp n h i m be mat nho Tuy nhien, qui trinh i n h hfldng cfla che' dp tUdi ngupi sfl dung mii nhiet phit sinh IcSn Tai vung tiep xuc dung dich Emulsion tdi dp nham b l mat gia gifla d i v i vit mii, nhiet dp co the len tdi 1090 cong mii 16 nhd thep 9XC qua toi se dUpc * 1650°C [1] Nhiet cat mii lim inh hudng khao sit vi dinh gia Them vio dd, cU dp tudi den chat lupng chi tiet mai nhu lim thay doi ciu ngudi hpp ly trpng trUdng hpp niy cung dflfle true cila Idp be mM, giim dp cflng, giy chiy nflt, chi bien dang [2] Do dd, can thiet phii sfl dung dung dich tudi nguoi, sfl dung mai vi nd c6 2.M6TATH1NGHIEM chiJc ning cP b i n la chong lai sU ting nhiet dp cua chi tiet [1] Them vio do, dung dung dich tudi nguoi se lim giim lUc cat mil va ting chat lupng chi tiet gia cong [1] Vi cic ly neu tren nen cho den da cd k h i nhieu cic nghien cflu ve viec tUdi nguoi mii l G l O l THIEU Cho den d i cd k h i nhieu nghien cflu v i ngoii nUdc ve tudi nguoi mai Cu Hinh l.Sddo thi nghiem the nbu nghien cflu ve i n h hudng cua nong dp dung dich tron ngudi den mflc dp bien cflng [3] Thi nghiem dupc tien h i n h vdi so mo hay ve flng suit dU [4] cua Idp be mat chi tiet ta tren hinh Cic thong so thi nghiem eu the mil Nghien cflu ve anh hudng c i a luu lupng dung dich tudi ngudi tdi nhiet dp mii [5], hay tdi nhu sau: tdc dp bdc tach vit lieu v i ning lupng gidi ban Mdy: Miy mii 16 N h i t Bin ky hieu MTrieng [6] Anh hUdng cua viec tfldi nguoi den 4501, cd cic thong so nhU sau: Cdng suit ddng dp n h i m be mat mii phang [7] va mii CO true chinh: 2,2 KW; So vdng quay true di mil: trdn ngoii [8] cung d i dUpc de cap den Viec p h i n loai cic loai dung dich tudi nguoi va cac 24.000v/p chflc ning cfla chflng cung da dupe thUc hien Di mii: Da mii Hai Duong, chat dinh [9] ket Bakelit, bat m i i corin dong tring, dudng Tfl cac phin tich tren cd the ndi, mic du kinh d =8mm da cd nhieu nghien cflu ve tUdi ngupi Dung cu siia dd: But chi kim cflong hat mil nhung cic nghien cflu vS tUdi ngupi cho m i l 16, die biet l i ve mii 16 nhd van ban che cua hing Vertex Dii Loan, so hieu VDRIOIO, cd Tren thUc te, viec tudi ngupi mii 18 nhd hat 0,2, kich thfldc dUdng kinh (|)10, chiSu dii 80 gap nhieu khd khin hon cic qui trinh mii khac Dung cu do: Miy dp nham SRT-200 Nguyen nhan l i dien tich ti^p xuc gifla d i mai (Hang China coal) ^ S S N 0866-7056 NAM, S6 nam 2016 livietnaiaiA'n W£T _^^u NGHIEN CLfU-TRAO D I Chi tiet gia cdng Can mil 16 c|)9 cua coi dip thude vien vdi vat Ueu thep 9XC toi dat 58 60 HRC (hmh 2) dang hon hpp t i m xoay (CCD) nhu hmh Him muc tieu: MinRa = 2y" f[x„x.^) (1) Vcfi Xj va x^ la lilu liidng va nong dung dich tu6i nguoi Mo hinh cua hdm hoi quy: Sii dung dang ham khao sat la ham hoi quy dang m6 hinh thong ke bac hai dang day du nhan to x, va x^ nen ham hoi quy bac hai co dang [10]: Htnh Chi tiet gia cong Chi cdt: Van toe da: V^ = 10 (m/s); Van toe phoi: n^ = 200 (v/p); LUdng chay dao doc; Sj = 0,1 (m/p); LUdng chay dao ngang: S^ = O.Olmm/htk " Dwn^dic/ifrtfMM^oi: Dung dich Emulsion pha v6i niicrc dat nong 3% - 6% V6i dung dich tiidi nguoi da neu, ta tien hanh theo thiet ke thi nghiem theo scf sau: LUU tiAing l(l^P) ^ Pul ^ P9J j \ Py^ -1 >'=*o+^i^i+M2+^2^i-'f2+*ii-^f+^22^2 KET QUA VA THAO L U A N Ket qua do nham be mat 16 mai vdi cac lUu lilcing va nong dung dich tudi nguoi khac dUtfc cho bang Sif dung phan mem Minitab 16 tien hanh phan tich ket qua thi nghiem, ta thu dncfc ket qua phan tich phifdng sai cua mo hinh hoi quy (Analysis of Variance for Ra) nhn tren hinh Tif hinh 4, ta thay gia tri P=0,965 (ling vcfi hang Lack of Fit) Icfn hcfn rat nhi^u so v6i mile y nghia a = 0,05 Dieu co nghia la mo hinh hoi quy la phu hcfp va ta co cac he so cua phifcfng trinh hoi quy nhif sau: 0,374; b;= 0.003; =0,037; b, =0,009 -1 p6 P5 Hinh Sd quy hoach thUc nghiem tTng dung phan mem Minitab 16 thiet ke thi nghiem theo phUdng phap be mat chi tieu (2) 0,05; b, 0,038; Cac he so tren the hien miJc dp anh hifdng cua cac nhan to lau lilcing (b^, b^^), nong (b^, b^^), tich hop lUu lifdng va nong (b^^) t6i ham muc tieu dp nham (Ra) Thay chiing vao bieu thiic (2) ta co phUPng trinh hoi quy: Y= 0,374 +0,003x^+0,05x,-0,038x,Xj+0,037x,^ +0,009Xj^ (3) '^ ISSN 0866 - 7056 TAP CHI CO KHf VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN C l i u - TRAO P6l 71 Ket qud nhdm be mat 15 gia cdi Cac Men Cac bifo TT Diem TN P2 P9 P9 Ra TT Diem TN 0.435 P4 (L/P) 1.0 6.0 0.505 0.376 P6 1.0 3.0 0.331 Ra LUu lupng Nong dp (%) (L/P) 6.0 4.0 4.5 2.5 (nm) LUulupng Nong dp (nm) (%) 2.5 4.5 0.370 10 P7 2.5 2.4 0.321 0.375 11 P8 4.0 3.0 0.411 P9 2.5 4.5 S P3 2.5 6.6 0.465 12 PI 4.6 4.5 0.454 P9 2.5 4.5 0.369 13 P9 2.5 4.5 0.381 P5 0.38 4.5 0.445 R H p o n w torfSM R q n M t e K to v t n w U n M^nS Hii)0 64 l u l M l i el VtitMM lec M M » 4.!ằ'M n> tulytt* ô*ãton*Biiav ^^d*^ wiu e.9eiôôi M) n SM'M tniM IWMl M M r u e.MHii MN CMC Tn* o.rwM G.MIHI COME*£G « late? aeogdi ).*M l.«M D.N* i t