Phan Quang The vd dtg Tap chi KHOA HOC & CONG NGHE 83(07): 67-71 ANH Hl/ONG CUA CHE DO CAT DEN CAC THANH PHAN LlTC CAT TRONG TIEN ClTNG TRlTC GIAO THEP 9XC BANG DUNG CU CBN Phan Quang Thg, Nguyin Thj Qu6c Dung , Hoang Minh Phuc Truang Dgi hoc Ky thudl Cong nghiep - DH Thdi Nguyen TOM TAT Bai bao trinh bay mot nghien cuu thuc nghiem ve anh huong cua van toe cat va lugng chay dao den cac lhanh phan luc cat tien cdng true giao thep 9XC Manh dao CBN dang dac vdi phan CBN cao dugc sd dung qua trinh tien cung phoi ong thep 9XC Hai nhan to van toe cat va lugng chay dao dugc tien hanh thi nghiem d hai mdc yeu to Trong qua trinh tien cung, cac phan luc cat da dugc dac Phan tich phuong sai ket qua thi nghiem cho thay ca ba yeu to van toe cat, lugng chay dao va tuong tac giira chung deu co anh huong dang ke den cac gia tri cda lire cat Trong do, lugng chay dao co anh huong Ion nhat va van toe cat co anh hubng it han so vdi anh huong cua tuang tac giua van toe cat va lugng chay dao Tu- khoa: Tiin cirng, luc cdt, dung cu cat, phdn tich phuong sal, lien citng true giao DAT VAN DE Vdi nhieu uu the ndi bat, lien cdng dang Id mgl phuong phdp gia cdng tinb dugc ung dung cdng rdng rai Irong cdc nganh cdng nghiep[l] Cd rdt nhieu nghien cuu lien quan den qud trinh lien cirng da dugc cdng bd Xem xel cac ket qud nghien cuu cho thdy, thudc linh cda dung cu cdt vd vdt lieu phdi, thdng sd hinh hgc cua dung cu, dieu kien gia cdng vd cdc linh chdt cua be thdng cdng nghe dugc coi nhu la cdc thdng sd dau vdo cua qud trinh lien cung vd chdng cd the dugc lira chgn bat ddu gia cdng Cdc thdng sd nhu luc cdt, nhiet cat, chdt lugng be mat vd tudi thg dung cu dugc coi nhu Id cdc lieu chudn ve hieu qud cua qua Irinh hoac Id cdc thdng sd ddu Viec xdc djnh chinh xdc lire cat qua trinh gia cdng ludn ddng vai trd quan trgng nghien cuu ldi uu hda qud trinh, thiet ke tdi uu cac thdng sd cda dung cu vd he thdng cdng nghe Luc cdt ddc trung cho cdng sual can thiet vd Id chi lieu chd yeu de thiet ke cdc phdn tu cda mdy cat kim loai, cdc co- cdu kep vd cd djnh dung cu cung nhu cdc yeu cdu ve cung vung de ddm bdo loai Iru rung ddng gia cdng Do lap kim loai dugc cdt di rdt mdng nen cdc thdnh phdn luc dugc cat kim loai thudng khdng vugt qud vdi ' Tel: 0915308818; Email; quocdung@tnut.edu.vn chuc den vdi trdm kilogram Mac du lire tuong ddi nhd so vdi cdc qud trinh gia cdng kim loai khde nhu ren, ep nhung ldc dung tren mdt dien tich rdi be da khien cho ung suat sinh Irong qud trinh cdt kim loai thudc loai cao nhdt Irong cdc qud trinh gia cdng Nhiet cao vd ung sudt Idn la nguyen nhdn cda mdt loai cdc qud trinh bda ly phdc tap xay qua trinh cdt ddng thai dien tich tiep xuc nho Id trd ngai Idn viec tiep can nghien cuu vdng cat Trong qud trinh lien cung cung cao cua phdi cung vdi cac thdng sd hinh hgc ddc Iruiig cda dung cu ldc cat Idn va dieu kien gia cdng khd da cd dnh hudng Idn Idm cho ldc dung cua luc cdt cd nhung thay ddi dang ke so vdi qua Irinh lien thdng thudng Vi vay, viec nghien cuu tim hieu ldc ddng cda cdc nhan td cdt den cdc thdnh phan luc cat Id dieu cdn thiet Dd cdn Id CO- sd de tinh loan ung sudt vd nhiel cdt, cdc nhan Id chinh anh hudng den tudi thg dung cu cung nhu chdt lugng be mat gia cdng Trong pham vi tim hieu ve cdc hien tugng xdy qud trinh tien cung, mdi loat cdc nghien ciru dd dugc lien hdnh cho nhieu loai vdt lieu Tuy nhien, cdc nghien cdu hien ihdi ve vdn de ndy vdn chua cho phep khdi qual hda cdc kel qud dat dugc vd dir dodn trang thdi cua cdc vdt lieu khde Vi vdy, viec nghien cdu ddi vdi cdc vat lieu ndy ludn phdi tiep luc[2] Theo Nakayama vd cdng su-[3], lire cdt 67 Phan Quang The vd dig gia cdng cac vat lieu cung khdng Idn hon cdc vat lieu mem mem Gdc trugt Idn va su hinh thdnh phoi rang cua do deo kem da Idm gidm luc cdt mac du ben cao cda vat lieu cung Hon nira, gia cdng cdc thep cung, gdc trudc am cua dung cu cdng Idn thi luc dgc true cang cao va lire cdt tiep luyen cdng thdp Su bien thien cua cdc thdnh phdn lire cat cung bj dnh hudng bdi su thay ddi cua cung cua vat lieu gia cdng Strafford va Audy [4] da cho thay tien cung thep AISI 4340 cd cung tu 29 ddn 57 HRC bdng dung cu gdm da cd su tang tuong ung luc cat lu 30-80% Trong mdt cdng bd khde[5] da chung Id rang tdc cdt cdng cao, luc dgc true vd luc cat rieng cdng thdp, khdng phu thudc vao mdn dung cu Anh hudng cua dieu kien cat den qud trinh tien trien cua luc cdt cung da dugc md hinh nhieu nghien cuu Bang viec lien hanh cdc thi nghiem gia cdng thep AISI D2 d cung 62HRC vdi dung cu cdt CBN, Arsecularatne vd cdng su [6] da ket ludn cd mdt mdi lien he chat che giua luc cdt vd dieu kien cat Huang vd Liang [7] trinh bdy luc cdt tdng cdng Id Idng cda cdc thdnh phan luc de lao phoi vd lire mdn mat sau Md hinh dugc ddnh gid bang thuc nghiem qua trinh tien cung chinh xdc thep AISI 52100 d cung 62 HRC vdi dung cu CBN Chen [8] cung cdng bd nghien cuu thuc nghiem tien cung thep bang dung cu CBN, lire hudng kinh cd gid trj Idn nhdt ba thdnh phdn lire cdt De cdi thien hieu qua chung cua cdng nghe tien cung, can thiet phdi cd mdt su hidu biet hodn chinh ve qua trinh Vdi muc tieu nhu vay, nghien cuu ndy tap trung vdo phdn ti'ch dnh hudng cua cdc nhan td didu kien cdt cung nhu dnh hudng cua su tuong tdc giua chung den cdc thdnh phdn luc lien cung true giao bang phirong phdp phdn tich thong ke THIET BI THi NGHIEM Thi nghiem dugc lien hanh tren mdy tien van nang Tuda (Nhat Ban) Phdi cd dang dng, chieu ddi L=80mm, dudng kinh 0 , lam tir thep hgp kim 9XC (Nga), tdi thd lich dat cung HRC 52-55 (hinhl) Thdnh phan hda hgc cua vai lieu phdi cho Irong bdng Dung 68 83(07): 67-71 Tap chi KHOA HOC & CONG NGHE cu cat dung thi nghiem Id manh CBN ddc hinh tam giac, ky hieu TNGN110308E (SECO-Thuy Dien) Ban kinh mui dao r=0,l, chieu day s=3,I8 (hinh 2) Than dao cua SECO ky hieu CTFNR2525MI1 hgp vdi mdnh dao de tao gdc trudc y = -60, gdc sau a = 60 Bang Thdnh phdn hda hgc cda thep 9XC Mn Ni Si P Cr Mo c 0,823 1,2351 0.0241 0.5862 0.0332 1,113 0.0192 W Ti Al Fe V Cu 90-1 U •f tlzt^ Hinh Phoi va dao dung Irong thi nghiem Cdc thdnh phdn luc cat dugc bang thiet bj luc ba chieu ky hieu PTT>JKD-DL (Vien Ten lua-Viet Nam) nhu hinh Hinh Thilt bj luc PTNKD-DL TRINH T U T H l NGHIEM Vdi muc lieu don gian hda qua trinh, thi nghiem xdc djnh dnh hudng cua cdc thdng so che cat den cac thdnh phan luc cdt dugc thuc hien theo sa cdt true giao Sa thi nghiem nhu hinh 3; Hinh Sa dd thi nghiem lien cung true giao Phan Quang The vd dtg 83(07): 67-71 Tap chi KHOA HOC & CONG NGHE Cac nghien cuu da chung Id quan he phu thudc giua luc cat vd cdc thdng so che dd cdt la quan he ham sd mu cd dang: E= CvVs'' (1) Trong Irudng hgp khdng xet den tuong tac kep giua cdc bien thi C, r, p, q Id cdc hang sd De luyen linh hda, logarit hai ve, ham bieu dien quan he phu thudc giua luc cdt vdo che cdt se Id: lnF=lnC-t-rlnv-i-pInt-i-qIns (2) Vdi SO' dd cat true giao nhu hinh 3, chieu sau cat t khdng thay ddi vd phan luc hudng kinh Ey se dugc loai bd Cdc thi nghiem dugc qui hoach theo ke hoach bac mdt hai nhdn td d hai muc yeu td nhu bdng Ngodi diem thi nghiem can thuc hien theo qui hoach cdn cd cac thi nghiem dugc Ihuc hien song song tai tdm Mdi thi nghiem dugc thuc hien tuong ung vdi chieu ddi cat L=15inm theo phuang dgc true d chieu sdu cdt cd djnh Id 3mm Cdc du' lieu ghi dugc nhu hinh cho thay luc cat tuang ddi dn djnh tren sudt chieu ddi cat chung td rung ddng Id khdng dang ke Ket qud thi nghiem dugc tdng hgp bang Thi nghiem Luc cat Nhan to V (m,/p) 75 245 160 160 160 s (mm/vg) 0.12 0.12 0.105 0.105 0.105 F,(N) F,(N) 1153.09 1432.56 1362.48 1287.28 1311.52 337.03 417.85 351.48 376.02 361.33 PHAN TICH KET QUA VA THAO LUAN Hinh Id dd thj dnh budng cua cdc nhdn td van tdc cat v, lugng chay dao s vd tuong tac giua chdng den cdc thdnh phdn lire cat F^ vd Ex lien cdng true giao Phdn tich phuong sai cda cdc thdnh phdn luc cat nhu bdng a ) c" InleracttCHi of f l n V Intanctton of F( w r Bang Cac thong so cat va cac mdc gia tri Lugng chay dao s (mm/v) 0.09 0.12 0.105 Van loc cat v (m/p) 75 245 160 Mdc yeu to -1 +1 v(-.p) Interaction of Fi vi Intaractton of Fx n £ IMJ1 •^ v -v i-,-.^- • -— —_- — e) I r—^ ^ / t ''.vV'- '.v> — 1, 7\, • ; Hinh Bien thien cda cac phan lire cat d a) n=330vg/ph; s=0,l2 mm/vg; b) n=770vg/ph; s=0.12mm/vg; Thi nghiem Nhan 16 Lire cat V s (m/p) (mm/vg) 75 245 0.09 0.09 Fz (N) F,(N) 1199.41 894.85 297.35 267.09 :(^ o«s oiB -.:v oTw ' iiS