Kết nối và tích hợp máy NC và CNC với máy tính nhằm mở rộng khả năng ứng dụng công nghệ CAD/CAM/CNC

NGHIEN CUU - TRAO DOI

J

KLT NO I V A TIC H HO P MA Y N C V A CN C V6 l MA Y TIN H NHA M

M d RON G KH A NAN G UN G DUN G CON G NGH E CAD/CAM/CN C

• • •

TOM TAT

Bai bao nay trinh bay each thCrc ket noi va tfch

hpp mpt so loai may NC va CNC co he dieu khien

cu vdi may tfnh va trien khai ling dung vao thac te

san xuat tai mpt so co sd dao tao va san xuat 6 Viet

Nam. Bang each phan tfch cong ket noi RS232 tren

cac may gia cong the he cu, thi/c hien viec bien doi

tfn hieu giao tiep vi dieu khien va tin hieu dien ap

theo tieu chuan truyen thong RS232 cua cac may

cd he dieu khien khac nhau ve cung dang chuan,

ket hpp vdi ky thuat ket noi va thiet lap cac tham

so parameter phu hpp cho nhieu he dieu banh

khac nhau tao thanh mpt mang may gia cong dieu

khien trd tiep tu1

may tfnh (DNC - Direct Numerical

Control). Ket qua nghien cull da dupe thCf nghiem

thanh cong tai mpt so co sd san xuat. Ket qua da

md ra trien vong cai tien, nang cap hieu qua cho

cac the he may NC va CNC cu.

1. Gl6l THIEU

Cac may gia cong so tich hop may vi tinh (Computer

Numerical Control - CNC) dang duoc sir dung ngay

cang pho bien trong gia cong co khi. Voi cac may CNC,

qua trinh thiet ke - gia cong tu dong dupe tich hop hoan

chinh, mang lai hieu qua dau tu Idn, dac biet vdi cac

loai hinh gia cong cac chi tiet phuc tap.

Trong cac co sd san xuat d Viet Nam hien nay,

(*) Tnrcmg Dai hoc Ky thuat Cong nghiep - Dai hoc Thai Nguyen

(**) Truong Cao clang Cong nghiep Hue

(*) DUONG XUAN TRUCJNG

NGUYEN VAN DU

NGUYEN DANG HOE

LE THI THU HIEN

(**) NGUYEN VAN TAN

cdn nhieu may gia cong NC, CNC tich hop cac he dieu

khien cu va chua ket noi dupe vdi may vi tinh hoac co

ket noi vdi may tinh nhung khong co kha nang dieu

khien DNC (Direct Numerical Control - Dieu khien so

true tiep). Do vay, cac may nay chua the ung dung duoc

cong nghe CAD/CAM de gia cong cac bien dang va

be mat phuc tap. Mat khac, cac may gia cong thuong

cd xuat xii khac nhau, sir dung cac he dieu khien cung

khac nhau nen kha nang tich hpp chung thanh mpt he

san xuat linh hoat FMS hay he thong san xuat tich hop

CIM rat bi han che. Chinh vi vay, nhu cau ket noi va tich

hop cac may gia cong nay vdi may tinh de eo the ung

dung duoc cong nghe CAD/CAM/CNC nham nang cao

kha nang cong nghe ciia may NC va CNC co he dieu

khien cu trong gia cong cac bien dang va be mat phuc

tap dang dupe dat ra kha pho bien.

Phan Idn cac he dieu khien may CNC pho bien hien

nay nhu: Fanuc, Heidenhain, Seimen, Fagor, Mitsubishi,

Hass, Anilam, GSK, Mazaktrol... deu duoc thiet ke de

giao tiep vdi cac thiet bi ngoai vi bang phuong phap

noi tiep theo tieu chuan RS232. Giao thiic ket noi nay

cd nhung uu diem noi bat nhu don gian, de sir dung,

truyen duoc khoang each xa va it bi nhieu [1-4]. Mat

khac, giao tiep theo tieu chuan nay duoc hau het cac

hp vi dieu khien ho tro trong lap trinh [4, 5]. RS-232

dupe xay dung de phuc vu chu yeu trong viec ghep noi

theo diem - diem, giua hai thiet bi dau cudi DTE (Data

Terminal Equipment) nhu giua may tinh vdi may CNC

hoac giua mpt thiet bi dau cudi va mpt thiet bi truyen du

lieu DCE (Data Communication Equipment). Tuy vay,

viec ket noi cac may cd cong RS232 nay vdi mav vi

tinh van gap nhieu trd ngai nhu: cac he dieu khien khac

nhau sir dung cac ma tin hieu va cap dp dien ap khac

nhau cho cac chan ket noi, khong theo giao thiic chuan

chung de cd the ket noi vdi may vi tinh... ^

TAP CHI CO KHI VIET NAM • Sd 4 - Thang 4 nam 2011 | Q