Xây dựng thuật toán xử lý số liệu đo lường kính bề mặt trụ trên máy đo ba tọa độ

NGHIEN Cflu-TRAOOdi

XAY DVNG THUAT TOAN XU" LY SO LIEU DO DU'ONC KINH BE MAT TRU

TREN MAY DO BA TOA DO

BUILDING THE ALGORITHM FOR DATA PROCESSING OF DIAMETER OF CYLINDRICAL

SURFACE MEASURED ON THREE COORDINATE MEASURING MACHINE

PGS, TS. Nguyen Tien Tho', TS. Vu Toan Thang', ThS. Vu Via Duy^

'TrUdng Dai hoc Bach khoa Ha Noi

^TrUcJng Dai hgc Cong nghiep Ha NoL

T6M TAT

Khi do be mat trii tren mdy do ha toa do, dot vdi mat tru cd mat ddu vuong gdc vdi diidng tdm,

trUdc tiin phdi xdc dinh vector phdp tuyen cua mat ddu roi chieu bo toa do diem do dUdc len tren mat

ddu theo phiidng phdp tuyen, sau do ditng gidi thuat xdc dinh dudng kinh trii; Con dot vdi be mat tru co

mat ddu khong vuong gdc vdi dudng tdm tru. phdi xdc dinh mot dudng tam khdi tao ban ddu roi quay

dudng tdm dd ve trimg vdi dudng tdm tru, tii do se xdc dinh dUdc dudng kinh tru. Bdi bdo ndy trinh bay

viec xay dung thuat todn xdc dinh dudng kinh cua chi tiet tru tii tap so lieu cdc diem do tren mdy do 3

t(3a do, phuc vu cho viec thiet kephdn mem mdy do 3 tga do dong thdi ndng cao kien thUc do ludng nhdm

khai thdc tot hdn mdy do 3 toa do ttii Viet Nam.

ABSTRACT

When measuring cylindrical surface on three coordinates measuring machine, if the top surface

is perpendicular to the center line, it first determines the normal vector of the top surface and the set of

coordinates of the measured points to the top surface under, then using the algorithm to determine the

diameter of the shaft; if the top surface is not perpendicular to the center line, to define an initial center￾line and then turning that center line coincides with the true centerline of the cylinder, then it be able to

calculate the diameter. This paper presents the development of algorithms to determine the diameter of

the details of the cylinder from the data of measured points on three coordinates, it is applied to build the

software for CMM and improve the understanding of coordinates measurements in order to better exploit

CMM in Vietnam.

TAP CHl CO KHf VI£ T NAM V S6 1 +2 (Thang 1 +2 nam 2013)