In view that the current status of non spinning diameter online detection

an on line measuring system for the diameter of thin-wall tube spinning is designed to improve the precision of thin-wall tube spinning

in which the system based on a method of measuring by a displacement sensor and an angle encoder. Displacement and angle are acquired by sensor

and a rectangular coordinate system is established to describe the coordinate of thin-wall contour of tube

while the diameter is calculated according to coordinate fitting circle. The system ’s software and hardware are accomplished and tested on experiment table. Experimental results show that the system’s resolution and measurement precision are 0. 05 μm and 2 μm

and the repeatability is good. The on line measuring system for the diameter of tube is a feasible method.