在线测量, 相对测量, 大外径, 精度

An apparatus,being composed of a measuring system and a calibrating system, for on-line measuring large external diameter from chord length and bow altitude,was designed and developed. The measuring system was mainly composed of three displacement sensors, and the calibrating system was mainly composed of a large circular disk, the two different diameters of which were known.The chord length and the initial bow altitude were calibrated with calibrating system, and the relative bow altitude was measured by displacement sensors. This apparatus structure is simple, and its operation is convenient. Analyzing the measuring precision with simulation and real measurement test, it shows the measuring accuracy for large external diameter with this apparatus is superior to 5μm.

on-line measuring, relatively measure, large external diameter, accuracy