NGHIEN CU'U-TRAO D I ANH Hl/dNG CUA BOI TRON LAM NGUOl T I THifeU (MQL) T | MON DAO VA Op NHAM B i MAT KHI GIA C N G GANG CAU EFFECTS OF MINIMUM QUANTITY LUBRICATION (MQL) ON TOOL WEAR AND SURFACE ROUGNESS WHEN MACHINING NODULAR CAST IRON ThS Nguyln Thai Binh Trudng Cao ding Cdng nghiep Thii Nguyen TOM TAT Bdi viet ndy tom tat qud trinh gia cdng gang cdu cd dp cung cao duac img dung cdng nghe boi tran - ldm nguoi tdi thiiu (MQL) vai dung dich tran ngudi Id ddu thuc vgt, cdc thdng so cong nghe gia cdng duac lua chpn truac Ket qud cda phuang phdp ndy dd mang lpi hiiu qud tot ve mon dao, nhdm be mgt chi tiit vd gdp phdn gidm thieu d nhiem mdi tru&ng Til khda: Gang cdu; Bdi tran - ldm ngudi tdi thiiu (MQL) ABSTRACT This paper presents a study on the application of Minimal Quantity Lubrication (MQL) technology in high hardness Nodular Cast Iron Machining using vegetable oil as a liquid coolant During the experiment process the machining parameters are preselected The results shown thai the surface quality was improved, the tool life increased and environmental pollution was minimized Keywords: Nodular Cast Iron; Minimal Quantity lubrication (MQL) GlOfI THIEU Theo cdng nghe truyen thdng, gia cdng vEit lieu gang, thdng thudng ngudi ta gia cdng khd (khdng bdi ttan) die dilm biln dang va cau tao hinh thu ciia gang Phin Idn gang cd kit ciu d dang ferit hoic peclit cd tir 3- 5% graphit d dang bdng, tam, phien hoic cau Chinh vi cd graphit len tinh deo cua gang giim, ttong qua trinh gia cdng lam phoi dl giy v i hoat ddng nhu mdt loai chit bdi ttan tu nhien, lire cat gia cdng gang tuang ddi nho va cho phoi vun Do viy, gang dupc xep vao nhdm vat lieu de gia cdng cit gpt, nhien gia cdng cat gpt gang ciu cd dp ciing cao (tii 150HB) thudng gap mdt sd vin de nhu: - Mdn dao tap chit ciing lln troag gang gay ra; - Cd hien tugng phoi chay deo va dioli bim len mat sau; ISSN 0866 - 7056 TAP CHf CO KHI VIET NAM Sd nam 2017 www.cokhivietnam.vn NGHIEN CCrU-TRAO D | - Mdi trudng lam viec ddc hai va nguy hiem ddi vdi ngudi cdng nhan [7] - Giam lire cat va mdn dao; - Ning cao tudi ben ciia dung cu cat - Khdng gian lim viec sach, gdp phin giam d nhilm mdi trudng, khdng inh hudng xiu den siic khde ngudi thp [2] De khic phuc cac nhugc diem ke tten, cac tic gii de xuat iing dung cdng nghe bdi ttan tdi thilu (MQL) [S] gia cdng vat lieu gang ciu vdi dung dich ttan ngudi la diu thuc vat (diu lac) v i che dp gia cdng, bdi ttan dugc tinh toan lua chpn trudc (tdi uu) vl nhimg uu diem ndi bit cua cdng nghe niy nhu: Sau day la tien trinh th\rc nghiem gia cdng gang ciu vdi phuang phip MQL v i cac ket qua dat dupc: TIEN TRINH THI NGHIEM IL^