NGHIEN cufu-TRAO Ddi NGHIEN CLTU DANH GlA HE THONG THiiT Bj THU' NGHIEM MON VlT ME - OAI OC Bl TRONG OlfeU KIEN MOI TRU'QNG TCVN 7699-2-30 STUDYING ON ASSESSING THE EQUIPMENT SYSTEM TO TEST WEAR OF BALL SCREW UNDER THE ENVIRONMENT OF TCVN 7699-2-30 TrSn Due Toan', Nguyin Thi Thu Ha^ Pham Van Hiing^ 'Khoa Cong nghe Co khi, Trudng Dai hgc Dien lire ^Khoa Co - Vu khi, Trudng Cao ding Cdng nghiep Qudc phdng ^Vien Co khi, Trudng Dai bgc Bach Khoa Ha Ngi TOM TAT Trin ca s& nghien cim mpt so phuang phdp dich chuyen co dp chinh xdc cao, bdi bdo trinh bdy qud trinh nghien cuu, phdn tich vd thiet ki hi thong mdy thi nghiem xdc dinh mdn dpc tryc vit me - dai 6c hi (VMDB) tdi vd so vong quay thay doi, dieu kien moi tru&ng TCVN 7699-2-30 Thiit bi co he thong cdc chuyen dpng tinh tien vd quay cita VMDB v&i chinh xdc hgp ly, ddp ung dugc cdc thong so cdn nghiin ciru Kit qud ddnh gid cdc thong so Id tdi, toe dp vd sai lech tinh tien cho thdy thiet bi hodn todn dap ung cdc yeu cdu cita thuc nghiim Tir khoa: Vit me — dai dc bi; Tuoi thp; Mon; Thiit bi; Moi tru&ng ABTRACT Based on studying some methods to measure transposition with high accuracy, this paper presented duration of study, analysis and design system of experimental machine to identify axial-wear of ball screw while having change in load and rotation speed, under the environment of TCVN 7699- 2-30 The working environment ofineasurement equipment to measure rotation and translation movement of hall screw had proper accuracy and met the studied parameters We assessed load, speed and translation deviation The results showed that the equipment totally met the need of the experiment Keywords: Ball screw; Life; Wear; Equiptment; Environment ISSN 0866 - 7056 TAP CHI CO KHi VTET NAM, Sd +2 nam 2015 www.cokhivietnam.vn Av NGHIEN cufu-TRAODdi Nguyen ly van hanh chung eua thiet bi: True vit me dugc dan dpng tu dpng co, quay VMDB la cum chi ti^t truyen ddng quan vdi sd vdng quay n, tai dgc true tac ddng len trgng may cdng cu CNC va cac thiet bi vit me duoc tao bdi ap luc dau pittongCO dien tii yeu cau chuyen dgng tinh tien ehinh xilanh Sau mpt thdi gian van banh nhat dinh xac Theo thdi gian Iam viec, mdn eua VMDB "t", true vit me va dai dc bi se mdn Khi dd, lam suy giam chinh xac cac chuyen dpng chuyen dpng tinh tien cua dai dc duoc bang tinh tien nd dam nhipm Viec nghien ciiu sai LS "f " se khdng dung vdi lupng chuyen ddng I?ch vi tri mon ciia VMDB can phai cd thiet tinh tien "t^" dugc bang LS trudc thdi hi dugc cac thdng so dich chuyen cua dai dc gian "t" Hieu cua t'^ - t^ chinh la luong mdn bi va cac goc quay cua true vit vdi chinh xac dpc true tdng cdng eua VMDB (thira nhan phu hgp, dac biet, VMDB Iam viec lupng tang them cua sai lech dpc true la mon cac loai mdi trudng khac Dua tren co sd gay phdng thi nghiem Tribology cua Vien Co khi, Trudng Dai hgc Bach Khoa Ha Ngi, tac gia da phan tich, thiet ke va che tao dugc he thdng thiit bi dap ling dugc yeu cau l.DATVANDE GIAI QUYET VAN DE 1.2.1 Sir ddnguySnly So nguyen ly he thdng thiet bj mon BKM-VMDB2014 tai va tdc dp thay ddi dupe the hien tren binh 1, vdi dae diem la toan bp cum dugc ga lap ben ngoai tu BKNA2 Hinh 2: Nguyen ly quang [1] 2.2.2 Phieffngphdp vd thiit bi - Cum chuyin dpng VMDB Thidt bi thii nghiem mdn BKMVMDB2014 dugc trang bi be thdng thang va he thong quay Ca bai he thdng deu dung thudc quang hpc, thudc thdng chuyen dpng tinh tien cua dai 6c, thudc quay chuyen dpng quay cua true vit Ca hai chuyen ddng deu la khu hdi Hinhl: Sadd nguyen ly tong the he thong thiet bj Tren hinh: 1) He thdng tgo tdi 2) Tii nhiet dm 3) Bd truyen dai rdng 4) Bp VldDB thi nghiem 5) He thong chuyen vi Nguyin ly bdng thu&c quang Khi chuy8n ddng tinh tiSn, khe sang ciia se dich chuyin tuong ddi vdi khe sang*^ ISSN 0866 - 7056 TAP CHi CO KHi VTET NAM, Sd 1+2 nam 2015 www.cokhivietnam.vn NGHIEN cufu-TRAO Ddi Tdc quay true vit me dupe xac dinh eua Khi hai khe sang trimg nhau, nhan dugc tin hieu xung, lech bang chieu qua gdc quay dugc ciia true vit me (phan hoi rpng khe, khdng nhan dupe tin hieu xung ti-en RE) va thdi gian quay Lugng dich chuyen cua so vdi dugc xac dinh bdng sd tin hieu xung thu dugc d vdi rgng khe sang Nguyen ly cd the ap dung cho ca thang (3 dang thang) hoac quay (3 dang dia chia) Dua tren yeu cau cua thuc nghiem, cac thiet bi da dupe lira chpn de chuyen dgng cua VMDB gdm cd: Thudc quang thdng Liner Scale "LS" cua hang SINPO, ma hipu "JOXE-0" chinh xac 0,001 mm de chuyen dgng tinh tien cua dai dc; Thudc quang quay Rotary Encoder "RE" ma hieu S48-85000VL (5000 xung/vdng) cua hang LS de chuyen dpng quay cua true vit me ,«^ mia '1 " Hinh 4: Sa dd thdy luc he thong tgo tdi Tren co sd nghien ciiu va phan tich cac Su dung bg truyen banh dai rang de dan loai thiet hi do, da dua dugc so nguyen dpng tir dgng co tdi true vit me, true vit me co ly he thdng tao mdn va sai lech cua chuyen chuyen dgng quay khii hdi, thay cac cap banh ddng VMDB tren hinh dai rang de thay ddi tdc dp true vit me Cum tao tai dpc triie su dung pittong - xylanh thuy luc So nguyen ly be thdng thiiy luc dugc the hien tren hinh Dieu chinh van tran VTI, VT2 de thay ddi tai - Tu nhiet dm BK-NA2 Hinh 3: Sa bd tri hi thong - Cum tdi toe dp quay true vit me Cum tai dpc true tac dung len VMDB dugc xac dinh qua ap suat ddu "p" va dudng kinh xilanh - pittong "SXL - SPT" Sii dung cam biin ap sudt "SIEMENTS SITRANTS P250" cd chinh xac