To obtain good assembly performance when transferring roll moment, a cone fit is adopted between cone shaft and cone sleeve of roller of high-speed wire rolling mill. This paper introduces an automatic cone measuring method, dissertates the principle of taking reference cylindrical surface of the roller as measuring reference to measure cones, and the main characteristics of the associated horizontal automatic cone measuring instrument. Measuring error of the instrument is also analyzed. The instrument uses grating transducers for cone diameter measurements and for axial positioning of transducer. The measuring error for diameter measurement is 1.4 μm, the axial positioning error is less man 0.01mm, and the relative error for taper measurement is less than 2x10~(-3). Since the instrument is equipped with data acquisition system, many parameters and actual profile of the measured cone can be obtained according to the collected measuring data. Furthermore, virtual assembly of corn shaft with cone sleeve can be carried out on the computer, and the actual assembly effect of cone shaft with cone sleeve can be observed so that selective assembly with higher accuracy can be realized to the fullest extent.
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