Method for measuring wheel polygon by means of under floor wheel lathe

The invention relates to a method for measuring a wheel polygon by means of an under floor wheel lathe. The method comprises following steps of (1) enabling an axial measuring wheel of a measuring device to make contact with an A position on a wheel inside reference surface by means of the under floor wheel lathe; (2) storing the coordinate data of the wheel inside reference surface; (3) withdrawing the measuring device safely; (4) enabling a radial measuring wheel of the measuring device to make contact with the rolling reference circle of the wheel profile; (5) rotating a wheel set by means of the under floor wheel lathe, and scanning the wheel for a whole round in the circumferential direction of the wheel continuously and uninterruptedly by means of the measuring device; (6) storing the actual geometric data of the wheel profile; (7) withdrawing the measuring device safely; (8) carrying out filtering, denoising and interpolation processing on the data of the wheel profile; (9) drawing the wheel geometrica