Tính toán độ cứng vững máy công cụ cấu trúc song song

r'-iii'.'i.hia.-j w

Tfn h toa n d o cun g vun g ma y

cdn g c u ca u tru e son g son g

(*) TS BUI QUY LlTC

(**) KS. DINH BA DINH

TOM TAT

Doctfng vOrng la dac tinh quan trong trong

thong so ki thuat cua may cong cu cau true

song song. Thdi gian trU6c day, viec phan tich

do ciing cua may cong cu cau true song song

chu yeu tap trung vao bieu cto do cufng cua

hexapods dua tren nen tang Stewar vdi cac

thanh chong. Gan day, co nhieu nghien cuu de

tinh toan do ciing vufng cua may cong cu cau

true song song bang cac rang buoc ciing. Dac

biet, da co phufong phap tim dugc do ciing toi

da va do cufng toi thieu cua true dan tai cac vi

tri bat ky trong khong gian lam viec cua may.

Cau true may song song giup cho may hoat

dong hieu qua hon, do curig vQng cao hon,

ket cau nhe nhang, sirdung cac chan phu hop

vdi chuyen dong cua may. Bai bao nay diia ra

phifOng phap xac djnh do cifng vung cua mot

mo hinh may cau true song song dien hinh, do

la may phay CNC 3 true.

1. M O T A H E THON G

Hinh 1 mo ta may phay 3 toa do cau tnic song

song, bao gom mot de di dong va 3 bo phan quay, di

chuyen theo chieu thang dung bang each gan vao cac

than may tuong ung. Trong moi ehuoi dong hoc, de di

dong va cum truot duoc noi vdi nhau bdi 3 thanh chong

cd do dai co dinh, do la bp khung gian hinh binh hanh. 3

(*) Tnicmg Dai hoc Bach khoa Ha Noi

(**) Cong ty TJSTHH Mot thanh vien - Vien May va Dung cu Cong nghiep

khdp noi cau tren mot bo phan quay tao thanh mot hinh

tarn giac deu. Dong co servo duoc gan vao dau vit me,

tao cho vit me chuyen dong quay, keo theo mat truot

cd the tinh tien doc theo true vit me bi. Cac chan ngoai

kha nang di chuyen tinh tien theo mat truot, con co kha

nang quay quanh cac khdp cau, tao ra cho cum de dong

(Cum true chinh) kha nang chuyen dong song phang.

Trong moi vi tri cua khong gian lam viec, de dong luon

song song vdi de may. Day chinh la uu the ciia may

cong cu cau tnic song song.

Hinh 1: Mo hinh may phay 3 toa do can tnic song song c ^ =

TAP CHI CO KHI VIET NAM •> So 4 - Thang 4 nam 2011 P |