NGHIEN Cflu TRAO DC!)! NGHIEN c C u THIET KE MAY CAT RANH XOAN CNC TRONG LO SAU Nguyen Trong Doanh', Nguyfo Dilc Minh' 'Vifo Co - Trfldng Dai hpc Bdeh khpa Ha Ndi -P7 E16 Phdng 6, Bd Cdng an TOM TAT Trong sdn xuat cdc loai nong sung, viec tao ranh xoan ben 16 sau Id cdng doan phac tap vd kho khan nhdt Ranh xodn Id sau co the la dang ranh co goc xoan khong doi hoac goc xoan thay doi Chuyen dgng gia cong bao gom ba chuyen dgng chinh Id chuyen dgng tinh tien, chuyen dgng quay ciia phoi vd chuyen dgng quay cua dung cu cdt Phoi hdp giaa hai chuyen dgng ndy tao cho ta cdc ranh xodn CO goc ndng CO dinh hay goc ndng thay doi Ba chuyen ddng ndy dadc ddm bdo bdi he thong dieu khien so Trong khuon khd cua bdo cdo ndy, chiing toi trinh bdy phadngphdp tinh todn thiet ke cdc true chuyen dgng chinh, xdy diing mo hinh dgng liic hgc vd ddnh gid cdc chi tieu chat lUdng cua he thong dieu khien trade tien hdnh che tao mdu ABSTRACT In the Gun manufacturing, cutting spiral drain inside of deep hole is one of most complicated and the most difficult operation Spiral drain perhaps can have a constant rising angle or variable rising angle Cutting movements is composed by two rotations of tool and part, with one translation Combinasing of rotation and translation will create spiral drain with constant or variable angle Theses movements are ensured by a CNC control system In this paper, there are presented a method of calculating 3nd designing of movement axes, build dynamic models and evaluation of performances of control 'ystem before to make a prototype Keywords: CNC cutting, deep hole, spiral drain, control, translation, rotation TAP CHl CO KHI V l f T NAM inl thfldng la O.ld Chieu rdng ranh xoan a ihOcn dung sai +0.3e vd sai sd gdc xodn cho ph i,i lo: Tren hinh2ld khai trien euah.ii d.mt; r: xoan: gdc xodn khdng ddi va gdc xodn IIKI\' i- " — S — ^ l-N •., -, ii(')c xo.iii cii.i riiiih xuan c^ - Van toe gdc ciia dpng Cd , 7"- - Md men tren true so cap, N - Ti sd truyen cua hpp giam toe, Jb - Mo men quan tinh cua vit me , Ci, - H? so giam chan cua vit me, Wj, - toe dp quay cua tryc vit, d^ - gdc quay cua true vit, M^ - mo men cat L- Budc cua true vit, "fc Duone kinh true vit, F^ - Luc cat theo hudng dgc tryc, ^ ij - Khdi lupng cua u dao va dao, x^ - Dich chuyen thang cua dao Tudng tu nhu phan tren, ta cd ham truyen cua phan co khi: 3.2 Mo hinh true chuyen dong tinh tien F:(s) = •••uC^) True tien dao cd ket cau gom ddng cd hop giam toe va vit me - dai 6e hoac vit me bi Do dac TAP CHl CO KHl VIET NAM (12) So (Thdng nam 2012) (Js+c'j (16) NGHIEN Cflu - TRAO D | va khdng dupc quan tam Nhung thuc tg, bai toan may khoan nay, ta thay nhilu d day chinh la luc cat Tuy nhien tac dpng chi cd anh hudng thdi gian rat ngan chuyen tfl trang thai chua cat sang trang thai cat Dap ung tren dau la toe dp c6 bi anh hudng nhung sau dd se dn dinh den tdc dp yeu cau vi ta sir dung bp dieu khien PID cd kha nang chdng nhieu rat tdt Dprig ca 3.3 Danh gia tinh on dinh va chat Ifldng cua he thdng dieu khien Hop giam IOC ri.i Hinh : Ivlo hinh ddng lflc hpc cua true tinh tien He thdng dieu khien servo toe dp dflpc bieu dien tren hinh Hinh : He thong dieu Idiien servo toe dp cua true tinh tien Ddng ed dien mdt chieu dieu khien tdc dp ed ham truyen Id he cap dang Chinh vi vay, thiet bi dieu khien PID sfl dung trfldng hdp la dieu kien de dam bao dp chinh xdc cao nhat Do he thdng dieu khien d trfldng hdp chi Id he cap 2, nen he ludn on dinh, chi chu y la dap flng cua he thdng la ham dao dpng hay khdng ma thdi Khi dieu chinh cdc he sd ti le Kp, he so tich phan KI va he sd vi phan KD theo phfldng phap Ziegler - Nichols, ta se thu dfldc he vdi toe dp ddp flng yeu cdu va cd the gidm hay loai bd han tac dpng cua dao ddng Ta quan tam nhat den sai so dieu khien, trfldng hdp la sai sd toe dp: e,, = :im;_., e- = im,,c s, £":'J) = Jinu-^c \.