METHOD OF DETECTING PRECEDING FEATURE AND APPARATUS FOR DETECTING PRECEDING FEATURE JUMP AND METHOD OF PRODUCING COLD PIPE USING THE METHOD OF DETECTING PRECEDING FEATURE

摘要

FIELD: production of fittings.;SUBSTANCE: invention relates to drawing pipes in cold state. Method involves a step of measuring the force applied to the rod to hold the mandrel in the direction of drawing and the stage of detection of preceding feature jump motion at the stage before the onset of discontinuous movement based on measuring the force values obtained at the stage of force measuring. At that stage of detection of the preceding feature includes a step of frequency analysis of values for measuring the force, obtained at the stage of changing forces in the specified frequency band, and a step of estimating the onset of the preceding feature jump motion when the peak intensity of the frequency spectrum, obtained by frequency analysis, exceeds preset reference value.;EFFECT: increase of quality of pipe.;3 cl, 6 dwg